Dissertations / Theses: 'Other Engineering and Technology'

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Li, Xiaojie. "First-principles study of materials for advanced energy technology." Licentiate thesis, KTH, Tillämpad materialfysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234895.

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The present thesis addresses promising material solutions for fusion reactors from a theoretical point of view. We focus on two specific systems: W-based alloys used as plasma-facing materials and reduced activation ferritic/martensitic (RAFM) steels used as structural materials of breeding-blanket. We aim to systematically investigate the alloying effects on the micro-mechanical properties of these body-centered cubic (bcc) solid solutions. The all-electron exact muffin-tin orbitals (EMTO) method in combination with the coherent-potential approximation (CPA) are the main tools for our theoretical studies. The knowledge of the elastic parameters and their solute-induced changes is important for alloy design and for a multi-scale modeling approach to the mechanical properties. We also explore the planar faults in the present alloys by studying the surface and unstable stacking fault energies. In part one, the effect of neutron transmutation elements on the elastic properties of the W-based alloys are calculated. Both Re and Os solute atoms shrink the lattice constant, which lead to increasing bulk modulus as the amount of Re or Os increases. The polycrystalline shear and Young’s moduli of W1−x−yRexOsy (0 ≤ x, y ≤0.06) enhance with the addition of Re but decrease with increasing Os. From the variations of the Cauchy pressure, Poisson ratio, Pugh ratio B/G, and the ratio of cleavage energy to shear modulus for the dominant slip system, we conclude that the intrinsic ductility of the alloy increases with increasing Re and Os content. The classical Labusch-Nabarro model for solid-solution hardening predicts that strengthening effects in W1−yOsy is larger than those in W1−xRex. We use the energy difference between the face centered cubic (fcc) and bcc structures to estimate the alloying effect on the ideal tensile strength in the [001] direction. Within a simple empirical equation, we find that the melting temperature of W-Re-Os alloy decrease with Re and Os addition. In part two, we investigate the micro-mechanical properties of the main alloy phases of three reduced activation ferritic/martensitic (RAFM) steels: CLAM/CLF-1, F82H, and EUROFER97. Being the main building blocks of the RAFM steels, first the lattice parameters, elastic properties, surface energy and unstable stacking fault energy of ferromagnetic α-Fe and Fe91Cr9 are calculated for reference. For quantitative understanding, we present a detailed analysis of the calculated individual alloying effects of V, Cr, Mn, and W on the elastic properties of Fe91Cr9. A linear superposition of these individual rates on the elastic properties of RAFM steels is shown to reproduce well the values from ab initio calculations. The composition dependence of the elastic constants is decomposed into electronic and volumetric contributions and analyzed. Finally, the intrinsic ductility is evaluated through Rice’s phenomenological theory by using the ratio of surface and unstable stacking fault energies. The results are consistent with those obtained by the common empirical criteria.

QC 20180912

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Junered, Marcus. "Enabling hardware technology for GNSS software radio research." Licentiate thesis, Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/32/.

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Johansson, Marcus. "Soil Moisture Monitoring System Using LoRaWAN Technology." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105670.

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An IoT device measuring soil moisture to help a municipality improve the work surrounding irrigation is deployed for testing and used by the concerned municipal workers. The IoT device is an initial prototype using Pycom’s LoPy4 with expansion board 3.1 and 3xAAA batteries as power supply. The prototype is not suitable for larger-scale testing due to the size, cost, and power consumption. This thesis focuses on decreasing the cost and size while increasing the battery life for the IoT device.The IoT device is communicating using the LoRaWAN protocol. For the device to be as energy-efficient as possible, the LoRa and LoRaWAN protocol are explored to use all possibilities to save energy. Active time and power consumption between different spreading factors are examined and discussed for power consumption and range concerns. The prototype produced by the work performed in this thesis is used to measure soil moisture. The microcontrollers selected and tested will not restrict to that purpose. The microcontrollers can integrate with many kinds of sensors. Integration with other types of sensors is under future work in this thesis. The integration possibilities making the thesis relevant for anyone with an intermediate knowledge inprogramming wanting to get introduced into the IoT development cycle, develop aLoRa node, and learning how to use the LoRaWAN stack with MicroPython.

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Rodriguez, Galvez Borja. "The Information Bottleneck : Connections to Other Problems, Learning and Exploration of the IB Curve." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254421.

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In this thesis we study the information bottleneck (IB) method. This is an informationtheoretic framework which addresses the question of what are the relevant factors of arandom variable X to explain another statistically dependent random variable Y . Thesefactors are embedded into a bottleneck variable T obeying the Markov condition Y $X $ T.The contributions of the thesis are three-fold: (i) The thesis serves as a survey onthe existing connections of the information bottleneck method with rate distortion theoryand with minimal sufficient statistics, for which we also extended the known theory byproving some unproved results and deriving new connections. (ii) The thesis also servesas a survey on the information bottleneck and learning. We recover the main results onsample bounds for learning, prove them insufficient for real-world problems and show theimportance of the recently found ties between information and generalization. Moreover,we provide with a clear intuition of why the information bottleneck is a good objectivefunction for supervised learning tasks. Furthermore, we provide with a new informationtheoretic generalization bound for linear models which, to the extent of our knowledge,is the first one which does not depend on the cardinality of the random variables. (iii)Finally, the main contribution of the thesis are the results regarding the exploration of theIB curve. The IB curve is the set of points describing the solutions of the informationbottleneck optimization in terms of compression of the inputs and explainability of theoutput. We introduce the convex IB Lagrangian, an objective function which allows us toexplore the IB curve (in contrast to the previously used IB Lagrangian). Furthermore, weprove there is a bijective mapping between the Lagrange multiplier used and the obtainedpoint in the IB curve, provided the IB curve shape is known. This means one could designthe Lagrange multiplier to obtain a desired level of compression or explainability.
I den här avhandligen studerar vi the information bottleneck method. Detta är ettinformations-teoretiskt ramvärk som tar itu med vilka som är de relevanta faktorerna av enstokastisk variabel X som förklarar en annan, statistiskt beroende, stokastisk variabel Y .Dessa faktorer är inbäddade i en bottleneck variable T, vilken uppfyller Markov-villkoretY $ X $ T.Bidraget av denna avhandling är trefaldigt: (i)Avhandlingen fungerar som en undersökningav existerande kopplingar mellan information bottleneck method och rate distortiontheory samt minimal sufficient statistics. Vi utökar den kända teorin om dessa kopplingargenom att bevisa nya resultat och härleda nya kopplingar. (ii) Avhandlingen fungerar ocksåsom en undersökning av information bottleneck and learning. Vi återfår huvudresultatenom sample bounds for learning, bevisar att de är otillräckliga för moderna problem och visarvikten av de nyligen funna kopplingarna mellan information och generalisering. Vi presenterardessutom en intuition för varför the information bottleneck är en bra målfunktionför supervised learning. Dessutom så hittar vi en ny information-teoretisk generaliseringsgränsför linjära modeller som, så vitt vi vet, är den första sådana som inte beror på kardinalitetenav den stokastiska variabeln. (iii) Slutligen, avhandligens huvudsakliga bidragär resultat angående utforskningen av IB-kurvan. IB-kurvan är mängden av punkter sombeskriver lösningarna av information bottleneck optimiseringen i form av kompression avinsignalerna och förklarlighet av utsignalerna. Vi introducerar the convex IB Lagrangian,en målfunktion som låter oss utforska IB-kurvan (till skillnad från den tidigare användaIB Lagrangian). Vi bevisar dessutom att det finns en bijective mapping mellan de användalagrangemultiplikatorerna och den erhållna punkten på IB-kurvan, så vida IB-kurvansform är känd. Detta innebär att det är möjligt att konstruera lagrangemultiplikatorn så attman för en önskad nivå på kompression och förklarlighet.

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Granström, Rikard. "Maintenance for improved punctuality : a study of condition monitoring technology for the Swedish railway sector." Licentiate thesis, Luleå, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25769.

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Banverket (‘the National Swedish Railway Administration') is responsible for management of the infrastructure in Sweden. The main objective of Banverket, stated by the Swedish government, is to assure a cost-effective and long-term provision of transportation for citizens and the business sector. In order to stay competitive with other forms of transportation, the railway needs to be cost-effective and provide reliable service. The reliable service is to a great extent reflected in terms of train punctuality. Railway components in general have a fairly long life, which means that the cost effectiveness of the transportation system is highly dependent on the effectiveness (doing the right things) and the efficiency (doing the things right) of its operation and maintenance process. The purpose of maintenance is to ensure business objectives through the assurance of required technical functions. Maintenance in the railway ensures the function of the systems that are es-sential for the operation of the transportation system. In other words, maintenance is a vital tool for achieving punctuality, which next to safety is Banverket's most important goal area. Developments in sensor technology and in the information and communication technology sector have provided new opportunities to use technology to assess infrastructural and rolling stock conditions. Decision support derived from condition monitoring systems can provide opportunities for improved maintenance management. In other words, condition monitoring can provide conditions for improved maintenance effectiveness and efficiency and hence punctuality. The thesis explores three areas. The first area is the exploration of current train delay statistics, performed in order to assess how the statistics can represent the influence of different factors on punctuality. The second is an exploration of the link between punctuality and maintenance and more specifically condition monitoring. The third area explores current condition monitoring applications at Banverket to form a knowledge foundation for further condition monitoring implementations intended to improve the reliability and hence the punctuality of the transportation system. In the perspective of the studies are important factors for successful applications of condition monitoring technology proposed. These are factors such as knowledge of problem characteristics, information accuracy, measurement limitations and ability to combine condition based maintenance objectives with business objectives etc. Furthermore, are recommendations for future condition monitoring implementations made. These are recommendations for enhancing the condition-based maintenance, which in turn is dependent on applications of condition monitoring. The final discussions are based upon overall experience from working with the material. The discussion links to the initial research problem, whose intension is to widen the horizon of possible condition monitoring applications.

Godkänd; 2005; 20061213 (haneit)

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Hagberg, Anna. "Industrial wastewater treatment and other environmental problems in Wuhan : Is Swedish technology a solution?" Thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88828.

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År 2000 startades ett samarbete mellan Wuhan i Kina och Borlänge Energi i Sverige. De två parterna bestämde år 2005 tillsammans med IVL, Svenska Miljöinstitutet, att samarbeta inom följande områden; hållbar energiproduktion, hållbar avfallsproduktion samt grundandet av ett miljöteknikcentrum i Wuhan. Miljöteknikcentrumet är till för att vara en plattform för svensk miljöteknik och expertis. Som ett första steg inför grundandet av ett miljöteknikcentrum gjordes en undersökning för att se inom vilka sektorer svensk miljöteknik kan etableras.

Undersökningen var inriktat på industriell avloppsvattenrening i Wuhan; bedömning av vilka typer av industrier/företag som har problem med avloppsvattenreningen och i vilken utsträckning det finns svenska tekniklösningar på problemen. Undersökningen genomfördes genom intervjuer med myndigheter och en del utvalda företag. Det var svårt att få fram information om vilka företag som inte följer de kinesiska gränsvärdena, varför en del besök gjordes till företag som lever upp till gränsvärdena. På grund av detta togs även andra problem med miljön som företagen hade upp. Några kommunala reningsverk besöktes och intervjuades också för att få en bättre bild av den kommunala vattenreningssituationen. En generell beskrivning av Wuhans miljösituation utfördes också samt en beskrivning av de viktigaste miljömyndigheterna och institutionerna.

Wuhans största utmaning är att konstruera reningsverk till alla de 3.5 miljoner som fortfarande släpper sitt avloppsvatten rätt ut till sjöar och floder, snarare än att ytterligare rena det industriella avloppsvattnet. Behandlingsgraden av det industriella avloppsvattnet har nått 97 % medan behandlingsgraden av det kommunala avloppsvattnet endast nått 70 %.

Besök vid de utvalda företagen och kommunala reningsverk ledde till slutsatsen att svensk teknik och expertis kan införas i följande områden: hantering av slam från reningsverk, byggandet av förbränningsanläggningar för sopor och hur man löser problemet med att rena luften från gaser som SO2 och dioxiner. De flesta företagen kunde följa de kinesiska gränsvärdena för utsläpp av avloppsvatten men mycket kan göras för att förbättra företagens tekniker ytterligare. Detta utförs dock nästan aldrig eftersom det är en ekonomisk fråga. Det är möjligt för Wuhan att sätta lokala, hårdare gränsvärlden för att tvinga företagen att förbättra sina reningstekniker ytterligare.

In 2000 a co-operation between Wuhan in China and Borlänge Energi in Sweden started. The two parts decided in 2005 together with IVL, the Swedish Research Institute, to co-operate in the fields of sustainable energy production, sustainable waste management and the establishment of an Environmental Technology Centre, supplying Swedish environmental expertise to companies in Wuhan. As a first step for the establishment of an Environmental Technology Centre in Wuhan, an investigation was made to find out in which sectors Swedish environmental technology could be established.

The investigation took aim at observing the industrial wastewater treatment in Wuhan and to see which types of companies that have problems with the wastewater treatment and if there existed Swedish technology that could solve the problems. The investigation was performed through interviews with the authorities and some selected companies. It was difficult to get information about companies that did not comply with the National Chinese wastewater standards. This meant that some of the visits were made to companies that comply with the standards, also taking into consideration other problems with the environment that the companies might have. Visits were also paid to municipal wastewater treatment plants to get an overview over the municipal wastewater treatment situation. An overall survey of the environmental situation in Wuhan was also made and a presentation of the most important environmental departments and institutions is given.

The greatest challenge for Wuhan is to construct wastewater treatment plants for the around 3.5 million people that still discharge their wastewater directly to rivers and lakes, rather than to improve the industrial wastewater treatment further. The treatment rate of the industrial wastewater has reached 97%, but the municipal wastewater treatment rate has only reached 70%.

After the visits to the selected companies and municipal wastewater treatment plants the conclusion was made that Swedish technologies and expertise can be applied to the following areas; handling sludge from the wastewater treatment plants, construction of waste incineration plants and handling flue gas and dioxins. Most of the visited companies could follow the wastewater standards. Although much can be done to improve their technologies further, this is not done since it is too expensive. It is possible for Wuhan to apply stricter local wastewater treatment standards. This could be used as a tool to make companies invest more money in improvements of their technologies.

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Vang, Nar. "A CONCEPT VALIDATION OF A MAGNETOMETRY-BASED TECHNOLOGY FOR DETECTING CONCEALED WEAPONS IN VEHICLE DOOR PANELS." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1475.

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Acts of insurgency have become an increasing threat resulting in extensive measures being taken by the law enforcement authorities to mitigate their devastating effects on human life and infrastructure. This thesis introduces a magnetometry-based information, and signal processing methodology for detecting concealed ferrous objects in vehicle body panels. From extensive literature research, it was observed that while magnetic sensors have been used in a variety of related applications, but they have not been extensively applied to the on-road detection of firearms and explosives concealed in vehicles. This study utilized an extensive experimental protocol for preliminary concept validation. The main idea behind the approach was that almost all concealed weapons and explosives are made up of a considerable amount of ferrous material, and hence produce a local distortion in the Earth’s magnetic field. This distortion can then be identified by utilizing sensitive magnetic sensors. To detect concealed ferrous objects, magnetic signatures of a vehicle door panel were obtained by using a scanning assembly design in this thesis project, and compared to a base magnetic signature of the same vehicle door panel. The base magnetic signature is the magnetic field data of the same vehicle where no foreign ferrous objects were present. To analyze the data, a signal processing methodology was designed. To achieve the objective of accurately detecting concealed ferrous objects, simple measures such as magnetic field strength and its energy density were computed. These simple measures were then used in conjunction with more sophisticated statistical methods such as, normalized cross-correlation and Mahalanobis distance. Although all these methodologies were able to detect a magnetic footprint anomaly in the presence of a concealed object, the Mahalanobis distance approach, in particular provided the most conclusive results in all the test cases considered.

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Candefjord, Stefan. "Towards new sensors for prostate cancer detection : combining Raman spectroscopy and resonance sensor technology." Licentiate thesis, Luleå : Department of Computer Science and Electrical Engineering, Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/2763685.

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BERG, WINCENT BOEL. "Gångavstånd för resor med elsparkcykel : En studie baserat på elsparkcykelaktören Voi Technology i Stockholm." Thesis, KTH, Transportplanering, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-255689.

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Electric scooters, or e-scooters as they also are called, were launched in California in USA as a bike share system, in 2017. A year later, in September 2018, the Swedish company Voi Technology launched the first e-scooters in Stockholm, Sweden. Bike share systems has been around since the 1960s but has grown substantially in the past 15 years. New technical solutions have solved past problems with theft and payment in bike shares. Since e-scooters are new, there is a lack of research and knowledge about practical use. The study aims to examine how long users of e-scooters walk to utilize the service. Travel data from Voi Technology is used to determine walking distance. The distance from the location where the app was opened to the location where the e-scooter trip begun was measured. The result was also compared the walking distance of other bike share systems and travelers of public transportation. The majority of e-scooter users walk less than 100 meters and 38 per cent walk less than 50 meters. The users have the shortest walking distance in the morning and the longest in the afternoon. During the weekend's users walk further than in weekdays. The users who travel longer distances with the e-scooters don’t walk further than other users. About a third of the users walk in the opposite direction of travel, to some extent, to catch an e-scooter. That indicates that the aim of the user in general seems to be to always have the shortest possible walking distance to the e-scooter.

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Dunstheimer, Markus. "Idea Management in Technology Development : Evaluation Criteria for Value Proposition, Technology and Strategy." Thesis, Högskolan i Halmstad, Centrum för innovations-, entreprenörskaps- och lärandeforskning (CIEL), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40790.

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Purpose Idea Management as key activity in the front-end of innovation is crucial for not only targeting new products but also for new technologies. Nevertheless, the interrelations between Idea Management and Technology Development are still not fully understood. Due to the different abstraction levels of products and technologies, an in-depth investigation of evaluation criteria for Technology Development ideas is required. Therefore, the purpose of this thesis is to examine which evaluation criteria are pertinent for each phase of Idea Management, when applied for Technology Development. Design The research framework for Idea Management criteria in the context of Technology Development is built on data from 17 semi-structured interviews, two focus group interviews as well as participant observations. The participants of this study are experienced R&D experts from a large Swedish organization in the transport industry. Findings The results indicate that the evaluation of Technology Development ideas is more complex due to the high degree of uncertainty and unpredictability. In contrast to the common one-step evaluation process of New Product Development ideas, the findings suggest a three-step evaluation process for Technology Development ideas. Due to the lack of knowledge and maturity when an idea is generated, this three-step evaluation enables a continuous reduction of uncertainty. In addition to this, the result of this study contributes with the suggestion to attribute a focus dimension for each Idea Management phase, which in consequence is helping firms to direct their evaluation resources. The findings are presented in a generic evaluation framework that leads organizations through the assessment process. Theoretical contribution The present study contributes to the literature with an improved understanding of TD idea evaluations by suggesting a rather internally use-oriented perspective as well as advances prior research through knowledge about the right timing for the use of evaluation criteria. Practical implications Irrespectively of the origin or focus of an idea, evaluation criteria are helping to direct Technology Development initiatives. By having evaluation criteria, defined as pertinent for each phase of Idea Management, Technology Development ideas can be assessed appropriately regarding their contextual circumstances. Originality The study is among the first that differentiates Idea Management for Technology Development from the one targeting New Product Development. This study suggests a framework that considers the stages and criteria necessary in the context of TechnologyDevelopment.

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Silander, Hagström Theresia, and Carl Carlström. "IoT in Food Retail : New Technology, New Opportunities." Thesis, KTH, Industriell Marknadsföring och Entreprenörskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209567.

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Purpose: The purpose of this research is to induce a deeper and wider understanding of theimplications and the consequences of IoT and how it can affect wholesalers’ and retailers’opportunities to increase the value for their end customer.Design/Methodology/Approach: History and challenges of IoT as well as of the food retailindustry were studied, combined with interviews covering areas such as present challenges andtechnological adoption with 18 professionals from incumbent retailers, wholesalers, disrupters,industry and technical experts. Answers from interviews summarised, categorized and mappedtowards theories on technological transformation and synthesised into future estimations.Findings: The findings regard how IoT can increase the end customer value in the future valuechain of the food retail industry and key limitations and opportunities for its future developmentwithin the sector. The results concern areas such as online shopping and distribution,immigration and travelling, sustainability, stores and offers, technological adoption, internal ITstrategy, sharing of personal and corporate data, standardisation and traceability, customerexpectations and finally change in the customer offer.Practical implications: The study's practical value is related to its utility in explaining andpossibly forecasting the development of IoT applications within different sectors, allowingmanagers to capture value arising from technological changes.Originality/Value: This study offers a model to clarify and explain the impacts and challengesof the IoT within the food retail sector and is generalisable to other sectors and technologies.Paper type: Master thesis

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Kotte, Hari Babu. "High Speed (MHz) Switch Mode Power Supplies (SMPS) using Coreless PCB Transformer Technology." Licentiate thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-13964.

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The most essential unit required for all the electronic devices is the Power Supply Unit (PSU). The main objective of power supply designers is to reduce the size, cost and weight, and to increase the power density of the converter. There is also a requirement to have a lower loss in the circuit and hence in the improvement of energy efficiency of the converter circuit. Operating the converter circuits at higher switching frequencies reduces the size of the passive components such as transformers, inductors, and capacitors, which results in a compact size, weight, and increased power density of the converter. At present the switching frequency of the converter circuit is limited due to the increased switching losses in the existing semiconductor devices and in the magnetic area, because of increased hysteresis and eddy current loss in the core based transformer. Based on continuous efforts to improve the new semi conductor materials such as GaN/SiC and with recently developed high frequency multi-layered coreless PCB step down power transformers, it is now feasible to design ultra-low profile, high power density isolated DC/DC and AC/DC power converters. This thesis is focussed on the design, analysis and evaluation of the converters operating in the MHz frequency region with the latest semi conductor devices and multi-layered coreless PCB step-down power and signal transformers. An isolated flyback DC-DC converter operated in the MHz frequency with multi-layered coreless PCB step down 2:1 power transformer has been designed and evaluated. Soft switching techniques have been incorporated in order to reduce the switching loss of the circuit. The flyback converter has been successfully tested up to a power level of 10W, in the switching frequency range of 2.7-4 MHz. The energy efficiency of the quasi resonant flyback converter was found to be in the range of 72-84% under zero voltage switching conditions (ZVS). The output voltage of the converter was regulated by implementing the constant off-time frequency modulation technique. Because of the theoretical limitations of the Si material MOSFETs, new materials such as GaN and SiC are being introduced into the market and these are showing promising results in the converter circuits as described in this thesis. Comparative parameters of the semi conductor materials such as the vi energy band gap, field strengths and figure of merit have been discussed. In this case, the comparison of an existing Si MOSFET with that of a GaN MOSFET has been evaluated using a multi-layered coreless PCB step-down power transformer for the given input/output specifications of the flyback converter circuit. It has been determined that the energy efficiency of the 45 to 15V regulated converter using GaN was improved by 8-10% compared to the converter using the Si MOSFET due to the gate drive power consumption, lower conduction losses and improved rise/fall times of the switch. For some of the AC/DC and DC/DC applications such as laptop adapters, set-top-box, and telecom applications, high voltage power MOSFETs used in converter circuits possess higher gate charges as compared to that of the low voltage rating MOSFETs. In addition, by operating them at higher switching frequencies, the gate drive power consumption, which is a function of frequency, increases. The switching speeds are also reduced due to the increased capacitance. In order to minimize this gate drive power consumption and to increase the frequency of the converter, a cascode flyback converter was built up using a multi-layered coreless PCB transformer and this was then evaluated. Both simulation and experimental results have shown that with the assistance of the cascode flyback converter the switching speeds of the converter were increased including the significant improvement in the energy efficiency compared to that of the single switch flyback converter. In order to further maximize the utilization of the transformer, to reduce the voltage stress on MOSFETs and to obtain the maximum power density from the power converter, double ended topologies were chosen. For this purpose, a gate drive circuitry utilising the multi-layered coreless PCB gate drive transformer was designed and evaluated in both a Half-bridge and a Series resonant converter. It was found that the gate drive power consumption using this transformer was less than 0.8W for the frequency range of 1.5-3.5MHz. In addition, by using this gate drive circuitry, the maximum energy efficiency of the series resonant converter was found to be 86.5% with an output power of 36.5W.

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Nanto, Darack B. "The Eco-Smart Can." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/honors/363.

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I noticed that maintenance workers had the same itinerary when emptying trashcans, meanwhile some trashcans needed to be emptied urgently. Traditionally, ETSU maintenance operate on daily routes to pick trash on designated time, regardless the level of the containers. The time, resources and labor invested in collecting the trash could be saved. Therefore, I decided to use the Internet of Things (IoT) to create a device that will optimize trash collection, to reduce costs and pollution.

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Sepulveda, Medina Paola. "Investigating the Role of a Less Uranium Tolerant Strain, Isolated from the Hanford Site Soil, on Uranium Interaction in Polyphosphate Remediation Technology." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1125.

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Bacteria are key players in the processes that govern fate and transport of contaminants. Previous assessment showed that the Arthrobacter oxydans (A.oxydans) G968 strain has a lower ability to tolerate U(VI) toxicity in bicarbonate-free media compared to other isolate A.oxydans G975. The study experimentally investigated several parameters such as the potential of bicarbonate to accelerate U(VI) release from autunite mineral in the presence of a less U(VI) tolerant bacterial strain, in the conditions mimicking Hanford Site subsurface environments. Results showed that despite morphological differences between the two bacterial strains, A.oxydans G968 and G975, they are able to dissolute uranium at the same capacity. The effect of both bacterial strands on autunite dissolution reduces as the concentration of bicarbonate increases. AFM and viability studies showed that samples containing bicarbonate are able to acclimate and withstand uranium toxicity. This study provides a better understanding of the bacterial role in polyphosphate remediation technology and interactions between meta-autunite and microbes.

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AGARWAL, SIDDHANT. "Implementation of k-Exact Finite Volume Reconstruction in DLR’s Next-Generation CFD Solver: Flucs and its Comparison to Other Methods." Thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220315.

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This thesis extended the order of the reconstruction of state for convective fluxes used by Finite Volume (FV) algorithm in DLR’s next-generation CFD solver: Flucs, from constant and linear to quadratic and cubic. Two approaches for calculating derivatives were implemented in Flucs and some test cases were tried. To allow for integration of moments within each cell and a higher-order integration of fluxes, the mesh used by Discontinuous Galerkin (DG) was fed to the FV algorithm. Insufficient geometric treatment of the boundary cells and the dummy cells in FV is believed to be detrimental to the order of error reduction in NACA0012 case and the smooth bump case. In the smooth bump case, the FV algorithms failed to show higher than second order error reduction because of this reason. The order of the schemes away from the boundaries was verified with the Ehrenfried Vortex test case. For at least structured meshes and unstructured meshes with quads, schemes of order k approached k + 1 order accuracy on sufficiently fine meshes. The original goal of this thesis was partly accomplished and some further work in the code is expected.
Detta examensarbete vidareutvecklade ordningen av rekonstruktion av tillståndet för konvektiva flöden som används av FV-algoritmen i DLR’s nästa generations CFD-lösare: Flucs, från konstant och linjär till kvadratisk och kubisk. Två metoder för beräkning av derivatorna genomfördes i Flucs och några testfall försökades. För att möjliggöra integrationen av momenten inom varje cell och integrationen av flöden på en högre ordning, matades det nät som används av DG till FV-algoritmen. Otillräcklig geometrisk behandling av gränscellerna och dummycellerna antas vara skadlig för ordning av felreduceringen i NACA0012-fallet och det Smmoth Bump-fallet. I det Smooth Bump-Fallet fick FV-algoritmerna inte visa högre än andra ordning av felreducering på grund av denna anledning. Ordningen av schemana bort från gränserna verifierades med Ehrenfried Vortex-testfallet. För åtminstone strukturerade nät och ostrukturerade nät med fyrkantiga celler nådde algorithmer med order k, k + 1 ordernoggrannhet på tillräckliga bra nät. Det ursprungliga målet för denna avhandling uppnåddes delvis och ytterligare arbete i koden förväntas.

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Ghandi, Reza. "Fabrication Technology for Efficient High Power Silicon Carbide Bipolar Junction Transistors." Doctoral thesis, KTH, Integrerade komponenter och kretsar, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-29726.

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The superior characteristics of Silicon Carbide as a wide band gap semiconductor have motivated many industrial and non-industrial research groups to consider SiC for the next generations of high power semiconductor devices. The SiC Bipolar Junction Transistor (BJT) is one candidate for high power applications due to its low on-state power loss and fast switching capability. However, to compete with other switching devices such as Field Effect Transistors (FETs) or IGBTs, it is necessary for a power SiC BJT to provide a high current gain to reduce the power required from the drive circuit. In this thesis implantation free 4H-SiC BJTs with linearly graded base layer have been demonstrated with common-emitter current gain of 50 and open-base breakdown voltage of 2700 V. Also an efficient junction termination extension (JTE) with 80% of theoretical parallel-plane breakdown voltage was analyzed by fabrication of high voltage PiN diodes to achieve an optimum dose of remaining JTE charge. Surface passivation of 4H-SiC BJT is an essential factor for efficient power BJTs. Therefore different passivation techniques were compared and showed that around 60% higher maximum current gain can be achieved by a newsurface passivation layer with low interface trap density that consists of PECVD oxide followed by post-deposition oxide anneal in N2O ambient. This surface passivation along with doublezone JTE were used for fabrication of high power BJTs that result in successful demonstration of 2800 V breakdown voltage for small area (0.3 × 0.3 mm) and large area (1.8 × 1.8 mm) BJTs with a maximum dc current gain of 55 and 52, respectively. The small area BJT showed RON = 4mΩcm2, while for the large are BJT RON = 6.8 mΩcm2. Finally, a Darlington transistor with a maximum current gain of 2900 at room temperature and 640 at 200 °C is reported. The high current gain of the Darlington transistor is achieved by optimum design for the ratio of the active area of the driver BJT to the output BJT.
QC 20110216

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Filippou, Angeliki. "Arsenic and other heavy metals in hydropower plants : An assessment of occupational risk hazards at Fortum’s underground hydropower plants in Sweden." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264044.

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Arsenic (As) is a metalloid that occurs naturally in the Earth’s crust, in bedrock and soil. The concentrations that Arsenic can be found are normally between 1-3 ppm. However, the concentrations vary naturally between different locations on the globe, and usually places that have sulphur-rich and shale deposits are linked to higher concentrations of Arsenic. Elemental Arsenic and especially inorganic Arsenic have been classified as human carcinogens, with long term exposure causing adverse effects like skin and lung cancer. The objective of this study is to investigate whether or not Fortum’s underground hydropower plants in Sweden, are within areas that present higher concentrations of Arsenic and if so, to assess if there may be any occupational risk hazards for the maintenance personnel while working in the plants. Based on SGU’s open geochemical database a map of Arsenic’s geospatial distribution was constructed, and according to that map and locations of Fortum’s underground stations, seven of them were selected to be further studied. Since the most relevant exposure pathways for the personnel in the plants, were considered to be intake of groundwater and inhalation of dust, samples of water and bedrock were collected from the selected plants, to be analyzed in the lab for the metal concentrations. Moreover, to better comprehend and assess the ways the personnel is exposed to the hazardous materials, a questionnaire was handed to them during the field visits. The results from the lab analyses of the rock samples, showed increased concentrations of Arsenic in the sample from Järpströmmen (9 ppm), and the samples from Anjan (4.5 ppm) and Kvarnfallet (4.6 ppm). However, all water samples concentrations in Arsenic were below the permissible limit of 10 μg/L. Although, the tap water sample from Anjan hydropower plant presented high content of Manganese and Iron associated to the bedrock deposits, and the tap water sample from Krångede presented high copper concentrations, associated to the existing piping system. According to these results, a few simple remediation actions were suggested for two abovementioned locations. It was concluded, by combination of all results from lab analyses of rock, water samples and questionnaire responses, that under current conditions, there are no unacceptable human health risks, due to exposure to arsenic, for the personnel working in the plants. However, it is advised that in the case that a new activity changes the steady state conditions, a new investigation should take place.
Arsenik (As) är en metalloid som förekommer naturligt i berggrund och jord. De koncentrationer som arsenik kan hittas i är normalt mellan 1 och 3 ppm. Koncentrationerna varierar naturligt mellan olika platser på jorden, och vanligtvis är platser med sulfider och skiffer kopplade till högre koncentrationer av arsenik. Elementär arsenik och oorganisk arsenik har klassificerats som karcinogener, som med långvarig exponering orsakar hud- och lungcancer. Syftet med denna studie är att undersöka huruvida Fortums underjordiska vattenkraftverk i Sverige ligger inom områden som uppvisar högre koncentrationer av arsenik och i så fall bedöma om det kan föreligga yrkesrisker för underhållspersonalen vid arbetet i kraftverken . Baserat på SGU:s öppna geokemiska databas byggdes en karta över arsenikens geospatialfördelning, och enligt denna karta och läget av Fortums underjordsanläggningar valdes sju av dem ut för att studeras ytterligare. Eftersom de mest relevanta exponeringsvägarna för personalen i kraftverken ansågs vara intag av grundvatten och inandning av damm, samlades prov av vatten och berggrund från de valda kraftverken, som analyserades i laboratorium för metallkoncentrationerna. För att bättre förstå och bedöma hur personalen utsätts för de farliga materialen, gavs ett frågeformulär till dem under fältbesöken. Resultaten från laboratorieanalyserna av bergproverna visade ökade koncentrationer av arsenik i provet från Järpströmmen (9 ppm), proven från Anjan (4,5 ppm) och Kvarnfallet (4,6 ppm). Alla koncentrationer av arsenik i vattenprover var dock under den tillåtna gränsen på 10 μg / L. Kranvattenprovet från Anjans kraftverk visade högt innehåll av mangan och järn kopplat till berggrunden, och kranvattenprovet från Krångede uppvisade höga kopparkoncentrationer kopplade till rörsystemet. Enligt dessa resultat föreslogs några enkla saneringsåtgärder för de två ovan nämnda kraftverken. Det slöts genom en kombination av alla resultat från laboratorieanalyser av berg- och vattenprover och frågeformulärssvar, att det under rådande förhållanden inte finns några oacceptabla hälsorisker för personalen som arbetar i kraftverken på grund av exponering för arsenik . Det rekommenderas dock att i händelse av att en ny verksamhet ändrar statusförhållandena, bör en ny utredning ske.

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Kvist, Jonathan, and Pontus Mathiasson. "Progressive Web Apps and other mobile developing techniques: a comparison." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20450.

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Developing an app for Android and iOS traditionally requires you to build two different versions. This is both costly and time consuming, which has led to the creation of many Cross-platform alternatives. One such alternative is to use a Progressive Web App (PWA). They are built like regular Web apps and include features previously unique to Native apps. Our focus is to compare PWAs to other Cross-platform solutions by measuring the performance of a PWA, Web app and Cordova app. Terms in the ecosystem are clarified due to inconsistencies, and the process of converting a Web app into a PWA is described. The measurements showed that the PWA and Cordova app had almost equal overall performance, and they were both faster than the Web app. This indicates that PWAs are a viable Cross-platform alternative, but more quantitative studies with performance in focus needs to be conducted due to the small scale of this work. Other aspects of PWAs also needs to be evaluated, such as app size and ease of development.

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Johansson, Lovisa, and Jesper Johansson. "TICaP : Technology Improvement for Care Planing." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-42668.

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En stor del utav dagens vårdtagare är äldre personer och majoriteten utav dessa vill kunna bo kvar i det egna hemmet under så lång tid som möjligt. Det som oftast hindrar dem är deras olika behov och funktionshinder som gör att de ständigt är i behov av någon annans hjälp. Detta bidrar till en otrygghet bland de äldre och en minskad livskvalitet i samband med oro och att man inte kan vara självständig på samma vis som förr. Dessutom är hemtjänsten i flera delar av Sverige högt belastad. En kombination av detta gör att resurserna inom vården inte räcker till för att täcka upp de behov som finns bland vårdtagarna. Med hjälp av informations- och kommunikationsteknologi så kan man effektivisera vården och bidra till en bättre användning av de befintliga resurserna. Detta ska medföra att arbetet underlättas för vårdgivarna och ge en ökad kvalitet inom hemtjänsten. Effekten av digitala lösningar inom vården ska öka självständigheten hos vårdtagarna, öka levnadsstandarden och skapa en större trygghet bland dessa och deras anhöriga. Med hjälp av applikationen Trixxa och Halmstad Intelligent Home så har man utvecklat TICaP, en kommunikationsplattform med implementerade sensorer och funktioner. Med hjälp av TICaP kan vårdgivare, vårdtagare och deras anhöriga kommunicera med varandra, sätta upp olika arbetsuppgifter samt få realtidsinformation om den aktuella vårdtagaren. Med hjälp av denna tjänst så kan man lösa många olika behov som finns bland vårdtagare som är beroende av hemtjänst. Även få en bättre koll på hur läget ligger till för vårdtagaren i hemmet. Man kan direkt få en notis om vårdtagaren behöver hjälp, har tagit sin medicin eller om vad man vill, man bestämmer själv vad notisen ska säga. Detta leder till en ökad trygghet hos vårdtagaren då han eller hon vet med sig att anhöriga och vårdgivare får direkt information samt en ökad trygghet för de anhöriga som enkelt kan ha kolla på vårdtagarens tillstånd via applikationen.
A majority of today's caretakers are older people and most of them want to be able to stay in their own homes for as long as possible. That which usually prevents them is their different needs and disabilities, which means that they are constantly in need of someone else's help. This leads to an insecurity among the elderly and a reduced quality of life in contribution with anxiety and the fact that they cannot be as independent as before. Also, the home healthcare system in Sweden is highly burdened. A combination of these factors makes the resources available to the home healthcare system insufficient to meet the existing needs of the caretakers. With the help from information- and communications technology you can streamline the home healthcare system and contribute to make better use of existing resources. This should make the work more effective for the caregivers and increase the quality of the home healthcare system. The effect of digitalized solutions in home healthcare systems should increase the independence for the caretakers, raise the standard of living and create greater security among them and their relatives. With help of the application Trixxa and Halmstad Intelligent Home, TICaP has been developed, a communications platform with implemented sensors and functions. With the help of TICaP, caregivers, caretakers and their relatives can communicate with each other, set up different tasks and get real-time information about the current caretaker. With the help of this service you can solve many different needs that exist among caretakers who are dependent on the home healthcare system. You can also get a better understanding of how the situation is for the caretaker in their own home. You can immediately get a notification if the caretaker needs help, if the caretaker has taken his medicine, or on what you want basically, you decide for yourself what the notification should say. This leads to an increased sense of security for the caretaker as he or she knows that the relatives and caregivers receive direct information, as well as an increased sense of security for the relatives who easily can oversee the general condition of the caretaker through the application.

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Brännvall, Evelina. "Accelerate ageing of refuse-derived-fuel (RDF) fly ashes." Licentiate thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17584.

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Ashes have properties that can be exploited in various applications, e.g. some ashes can be used in the construction of barriers in a landfill final top cover. A landfill top cover is a multilayer construction that protects the environment in several ways, for instance hindering gas emissions from the landfill body and water infiltration into the waste.Impervious natural materials like clay, synthetic materials like geomembranes or bentonite carpets, geosynthetic clay liners or combinations of such materials are commonly used in landfill top cover constructions. Since differential settlement may occur and the lifetimes of the synthetic materials are uncertain, it is advantageous to use thick mineral constructions. There is a great need for these materials, and substantial savings of resources can be made if alternative waste materials, like ashes, are used. Currently, ashes are either landfilled or used as construction materials. They are subject to weathering processes, including physical, chemical and mineralogical changes caused (inter alia) by fluctuations of temperature and humidity, atmospheric gases or acid rain. Ashes contain various potentially hazardous and non-hazardous chemical compounds. Therefore, precautions must be taken to avoid leaching of substances such as heavy metals into the surrounding environment. Mineral phases that are initially present and/or that form during the ageing are primarily responsible for the immobilization or leaching of diverse metals and salts. Newly formed mineral phases like clay minerals are of main interest, because of their very high cation exchange capacity, swelling and expansion properties.The conditions found in a landfill environment are likely to favour clay mineral formation. This thesis is based on studies on the effects of accelerated ageing on refuse-derived-fuel (RDF) fly ashes, in experiments under controlled laboratory conditions, intended to derive models to predict the stability of RDF fly ashes used in a landfill liner and the mineralogical changes that occur in them. A reduced factorial design was applied, followed by multivariate data analysis, to evaluate the effects of five factors - carbon dioxide (CO2) levels, temperature, relative air humidity (RH), time and the quality of added water - on mineral transformations within the ashes, and their acid neutralization capacity (ANC) and leaching behaviour.Minerals (ettringite and hydrocalumite) promoting the immobilization of hazardous compounds were found in both fresh ash and ash aged under atmospheric conditions, but these minerals disappeared upon carbonation. The main phases in ash at 20% and 100% CO2 were calcite, gypsum/anhydrite and vaterite. The abundance of gypsum and anhydrite was directly related to the temperature at which ashes were aged. The major mineral phases detected in ashes aged under 20% CO2, 65% RH and 30°C (corresponding to conditions generally found in a landfill cover) were calcite and gypsum/bassanite. The pH values of these ash specimens ranged from 7.2 to 7.6, indicating advanced carbonation. Ageing decreased pH values from 12.4 to 7.2, consequently affecting the leaching behaviour of most chemicals measured in the leachates. Levels of Ba, Ca, Cl, Cr, Cu, Pb, K and Na decreased over the study period while those of Mg, Zn and SO4 increased. No clay minerals were detected by XRD and SEM analysis in either fresh or aged ashes. However, geochemical modelling indicated that such minerals may precipitate. The modelling also indicated that clay minerals like saponite, vermiculite, chrysotile and hydrotalcite were likely to precipitate in most leachates from ash aged for 3, 10 and 22 months. Smectite, montmorillonite and illite may precipitate in leachates of ash aged for 31 months. The formation of smectite, montmorillonite and vermiculite would be advantageous due to their very high cation exchange capacities, which would favour the stabilization/immobilization of heavy metals in the mineral phases.
Askor har egenskaper som kan användas, en del askor kan t ex användas vid konstruktion av tätskikt i en deponisluttäckning. En deponisluttäckning är en flerskiktskonstruktion som skyddar miljön från t.ex. växthusgaser från deponin och hindrar vatteninträngning till avfall. Naturliga täta material som lera, syntetiska som geomembraner eller bentonitmattor eller en kombination av dessa är vanligt förekommande i sluttäckningskonstruktioner på deponier. Eftersom differentialsättningar kan uppkomma och de syntetiska materialens livslängd är osäker, är det en fördel om tjocka mineraliska konstruktioner kan användas. För dessa är materialbehovet stort och det är en stor resursbesparing om alternativa material, som aska, kan användas.Aska utsätts för åldringsprocesser både när den deponeras eller användas som byggmaterial. Materialet genomgår fysiska, kemiska och mineralogiska förändringar orsakade av t.ex. variationer av temperatur och luftfuktighet, atmosfäriska gaser eller surt regn. Aska innehåller olika farliga och ofarliga kemiska föreningar. Därför måste försiktighetsåtgärder vidtas för att undvika läckage av tungmetaller i miljön. Befintliga och nybildade mineralfaser är främst ansvariga för immobilisering eller utlakning av olika metaller och salter. Nybildade mineralfaser som lermineraler är av stort intresse på grund av deras mycket höga katjonutbyteskapacitet, svällnings- och expansionsegenskaper. Förhållandena som råder i en deponisluttäckning förväntas gynna lermineralbildning.Denna avhandling är resultatet av studier av effekten av accelererad åldring på flygaska från energiutvinning. För att förutsäga stabiliteten i flygaska som används i ett deponitätskikt har laboratorieexperiment utförts för att studera effekterna av accelererad åldring under kontrollerade förhållanden. Ett reducerat faktorförsök har gjorts för att utvärdera påverkan av fem faktorer: koldioxid (CO2), temperatur, relativ luftfuktighet (RH), tid och kvalitet på tillsatt vatten. Inflytandet av dessa faktorer på mineralomvandlingen i askan, askans syraneutraliserande förmåga (ANC) och urlakningsbeteendet har analyserats och utvärderats med hjälp av bl a multivariat dataanalys. Mineraler (ettringit och hydrocalumit) som främjar fixeringen av farliga ämnen finns i både färsk aska och prover som åldrats under atmosfäriska förhållanden men försvann efter karbonatisering. Aska som åldrats under 20 % och 100 % CO2 hade kalcit, gips / anhydrit och vaterit som huvudmineraler. Förekomsten av gips och anhydrit var direkt relaterad till temperaturnivån som askan hade åldrats i. Aska som åldrades under 20 % CO2, 65 % RH, 30 °C temperatur (motsvarande förhållandena i en deponitäckning) hade kalcit och gips/bassanit som huvudmineraler. pH-värdena i proverna varierade från 7,2 till 7,6 vilket indikerar en långt fortskriden karbonatisering. Åldrandet sänkte pH-värdena från 12,4 till 7,2 och påverkar därmed urlakningsbeteendet för många lakvattenkomponenter. Barium, Ca, Cl, Cr, Cu, Pb, K och Na minskade under tiden, medan Mg, Zn och SO4 ökade jämfört med den färska askan. Inga lermineraler upptäcktes med hjälp av XRD och SEM i varken färsk eller åldrad aska. Geokemisk modellering visade dock möjligheten för dessa mineraler att bildas och fällas ut. Lermineraler som saponit, vermikulit, krysotil och hydrotalcit kunde enligt beräkningarna bildas i lakvatten från de flesta proverna som åldrades i 3, 10 och 22 månader. Smectit, montmorillonit och illit kan bildas i lakvatten från 31 månaders åldrad aska. Bildning av smectit, montmorillonit och vermikulit skulle var värdefull på grund av deras mycket höga katjonutbyteskapacitet, vilket gynnar stabilisering / immobilisering av tungmetaller i askan.
Godkänd; 2010; 20101020 (evebra); LICENTIATSEMINARIUM Ämnesområde: Avfallsteknik/Waste Science and Technology Examinator: Professor Anders Lagerkvist, Luleå tekniska universitet Diskutant: Professor Britt-Marie Steenari, Chalmers tekniska högskola Tid: Onsdag den 17 november 2010 kl 09.30 Plats: F1031, Luleå tekniska universitet

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Graham, Brennan P. "Application of Argon Plasma Technology to Hydrophobic and Hydrophilic Microdroplet Generation in PDMS Microfluidic Devices." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1728.

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Abstract Application of Argon Plasma Technology to Hydrophobic and Hydrophilic Microdroplet Generation in PDMS Microfluidic Devices Brennan Graham Microfluidics has gained popularity over the last decade due to the ability to replace many large, expensive laboratory processes with small handheld chips with a higher throughput due to the small channel dimensions [1]. Droplet microfluidics is the field of fluid manipulation that takes advantage of two immiscible fluids to create droplets from the geometry of the microchannels. This project includes the design of a microfluidic device that applies the results of an argon plasma surface treatment to polydimethylsiloxane (PDMS) to successfully produce both hydrophobic and hydrophilic surfaces to create oil in water (O/W) and water in oil (W/O) microdroplets. If an argon plasma surface treatment renders the surface of PDMS hydrophilic, then O/W microdroplets can be created and integrated into a larger microdroplet emulsion device. The major aims of this project include: (1) validating previously established Cal Poly lab protocols to produce W/O droplets in hydrophobic PDMS microdroplet generators (2) creating hydrophilic PDMS microdroplet generators (3) making oil in water droplets in hydrophilic PDMS microdroplet generators (4) designing a multilayer microfluidic device to transfer W/O droplets to a second hydrophilic PDMS microdroplet generator v W/O droplets were successfully created and transferred to a second hydrophilic PDMS device. The hydrophilic PDMS device also produced O/W droplets in separate testing from the multilayered microfluidic PDMS device. The ultimate purpose of this project is to create a multilayer microdroplet generator that produces water in oil in water (W/O/W) microdroplet emulsions through a stacked device design that can be used in diagnostic microdroplet applications. Thesis Supervisor: Dave Clague Title: Professor of Biomedical Engineering

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Naughton, Colleen Claire. "Assessing Appropriate Technology Handwashing Stations in Mali, West Africa." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4833.

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Proper hand hygiene is the most effective and efficient method to prevent over 1.3 million deaths annually from diarrheal disease and Acute Respiratory Infections (ARIs). Hand hygiene is also indispensable in achieving the fourth Millennium Development Goal (MDG) to reduce the childhood mortality rate by 2/3rds between 1990 and 2015. Handwashing has been found in a systematic review of studies to reduce diarrhea by 47%#37; and is, thus, capable of preventing a million deaths (Curtis et. al., 2003). Despite this evidence, hand washing rates remain seriously low in the developing world (Scott et al., 2008). This study developed and implemented a comprehensive monitoring strategy of five usage variables (i.e., soap usage, functionality, presence of cleansing agent, ground wetness under station, amount of water in the jug) for 42-64 appropriate technology handwashing stations. These stations were monitored throughout 2011-2013 in two communities in Mali, West Africa. Statistically significant (p < 0.05) results include: 1) a 29%#37; decrease in soap usage from dry (October-June) to rainy seasons (July-September), 2) 35%#37; decrease in stations with presence of cleansing agent between 2011 and 2012, 3) higher station usage for stations in households with higher scores on the Progress out of Poverty Index® , 4) 27%#37; less of the stations far from a water source (35 meters-172 meters away) had a cleansing agent present than stations close to a water source (less than 35 meters) during the rainy season. Station usage also differed based on gender of the handwashing station owner in the two communities where stations built by women were used more in Zeala than those in Nci'bugu. In contrast to Zeala, handwashing stations built by men in Nci'bugu had higher soap usage and usage variable proportions than those built by women. Handwashing training and promotions resulted in 98%#37; of households reporting that they wash their hands with soap in 2012 from 0%#37; in 2011. Altogether, this study designed and implemented a robust monitoring system that succeeded in quantifying handwashing station usage for over two years. In-depth analysis of the data established six sustainability factors for handwashing stations (gender, training, water, seasonality, wealth, and monitoring) that are critical for lasting handwashing behavior change and successful hygiene interventions to save lives.

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Abdul, Rahman Mohd Syaifudin Bin. "Novel sensor design for detection of dangerous contaminated marine biotoxins : a thesis submitted in fulfilment of the requirements for the degree of Master of Engineering in Information and Telecommunication Engineering, School of Engineering and Advanced Technology, Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1007.

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Planar electromagnetic sensing system has been used as one of the NDT methods to evaluate the material properties i.e., to evaluate near-surface properties such as conductivity, permeability and dielectric properties. The applications of planar electromagnetic sensors will depend on both the characteristic of the sensor type chosen and also the characteristic of material under test. Conventional planar interdigital sensors and novel planar interdigital sensors have been designed, fabricated and tested for detection of dangerous marine biotoxins in seafood. Our main objective is to sense the presence of dangerous contaminated acid in mussels and other seafoods. Initial studies were conducted with three peptide derivatives namely Sarcosine, Proline and Hydroxylproline. These three chemicals are structurally closely related to our target molecule (domoic acid). The initial results have shown that all sensors respond very well to the chemicals and it is possible to discriminate the different chemicals from the output of the sensor. Novel interdigital sensors have shown better sensitivity measurement compared to conventional interdigital sensors. The novel interdigital sensors were then being tested with three seafood products. Results from the analysis have shown that novel interdigital sensor with configuration #1 (Sensor_1) has better sensitivity compared to other sensors. Sensor_1 has been chosen for experiment using proline and mussels. The changes in sensor sensitivity were analysed with mussels before and after adding the proline. The presence of proline on the mussel surface and also injected proline to the mussel samples were clearly detected by Sensor_1. Further experiment was conducted with small amount of domoic acid (0.5 µg to 5.0 µg) injected to a mussel and it was found that Sensor_1 was able to detect small amount of domoic acid (1.0 µg) injected into the mussel sample. Sensor_1 was able to detect approximately 12.6 µg/g of domoic acid in mussel meat. Three threshold levels of particular sample thickness have been established for detection of domoic acid. The first prototype of a low cost sensing system known as SIT (Seafood Inspection Tool) has been developed. The outcomes from the experiments provide chances of opportunity for further research in developing a low cost miniature type of sensors for reliable sensing system for commercial use.

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Nopparat, Nanond, and Babak Kianian. "Resource Consumption of Additive Manufacturing Technology." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3919.

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The degradation of natural resources as a result of consumption to support the economic growth of humans society represents one of the greatest sustainability challenges. In order to allow economic growth to continue in a sustainable way, it has to be decoupled from the consumption and destruction of natural resources. This thesis focuses on an innovative manufacturing technology called additive manufacturing (AM) and its potential to become a more efficient and cleaner manufacturing alternative. The thesis also investigates the benefits of accessing the technology through the result-oriented Product-Service Systems (PSS) approach. The outcome of the study is the quantification of raw materials and energy consumption. The scope of study is the application of AM in the scale model kit industry. The methods used are the life cycle inventory study and the system dynamics modeling. The result shows that AM has higher efficiency in terms of raw material usage, however it also has higher energy consumption in comparison to the more traditional manufacturing techniques. The result-oriented PSS approach is shown to be able to reduce the amount of manufacturing equipment needed, thus reducing the energy and raw materials used to produce the equipment, but does not completely decouple economic growth from the consumption of natural resources.

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Johnson, Dawn Rene. "Sense of belonging among women of color in science, technology, engineering, and math majors investigating the contributions of campus racial climate perceptions and other college environments /." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7723.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Dept. of Counseling and Personnel Services. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Ren, Qizheng. "The Application of Gage R&R Analysis in s Six Sigma Case of Improving and Optimizing an Automotive Die Casting Product’s Measurement System." TopSCHOLAR®, 2015. http://digitalcommons.wku.edu/theses/1536.

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With the rapid development of automation technology in automotive manufacturing processes, massive and efficient production is a current trend. Therefore, measurement systems with accurate and automated measuring instruments are sought by automotive companies and suppliers. However, the problematic measuring instruments with unreliable accuracy and stability lead to erroneous measurements and wrong quality decisions that cause manufacturers huge profit losses. An effective method called “measurement system analysis” can be applied to define and eliminate erroneous measurements to ensure adequate reliability. An automotive transmission die casting parts supplier called company T was suffering a serious profit loss due to the erroneous measurements from one type of their product’s measurement system. These erroneous measurements caused the company to deliver nonconforming products to their customers. The researcher conducted a study applying Six Sigma methodology to find out the root cause of the erroneous measurements and eliminate the erroneous measurements to retain adequate reliability. The researcher used DMAIC (Define, Measure, Analysis, Improve, and Control) process as framework to conduct the study and the measurement system analysis, Gage R&R method, to process several experiments for data collection and analysis. Through processing the experiments and analyzing the results, the researcher was able to detect the source of variation and find the root cause that caused the erroneous measurements. Based on the findings, the researcher then corrected the erroneous measurements and improved the problematic measurement system’s performance.

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Guzel, Nazim Beysin, and Ogul Tasman. "Diffusion of 5G Technology and Potential Impact on Business Models : Technology Enabled Value Creation in the Cleaning Industry." Thesis, Uppsala universitet, Industriell teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447298.

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New technological innovations are considered as one of the major drivers of economic growth. However, in order to be able to achieve this growth, the diffusion of these new technologies is essential. The large number of factors that influence the diffusion process makes it rather difficult to make estimations, before the realization of the process. Especially emerging technologies, such as 5G technology, can considerably benefit from a better analysis of the diffusion process in order to fully realize their potential. Based on this shortcoming in the existing literature, this study aims to determine the possible impacts of adoption of 5G technology on business models within the cleaning industry. As it is implied in the objective, these impacts of adoption of 5G technology on business models are enabled by the adoption of 5G technology. Therefore, the constraints which influence the adoption of 5G technology are researched initially, as it is a prerequisite to identify potential modifications on business models. A qualitative research methodology was deemed appropriate after the investigation of previous research within the field and to complement the case study design which this thesis internalizes. In addition to the review of relevant academic literature, twelve semi-structured interviews have been conducted as another data source. The qualitative data obtained from these interviews are analyzed using the thematic analysis method and themes are identified after the coding and categorization process. After the analysis, three areas of interest, which are Revenue Models, Logistics Operations and Automation for Individualization, have been identified according to the similarities of results, anticipated opportunities and observed challenges within the cleaning industry. Within these areas, the effects of adopting 5G technology on the value proposition of the business model are examined while considering the drawbacks of the cleaning industry through the collaboration with an external company called L2GO. The study concludes by proposing four potential implications of 5G adoption on business models within the identified areas and identifying the possible changes in their value propositions.

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Narang, Kritika. "Tailoring of adsorptive properties of zeolites for biogas upgrading." Licentiate thesis, Luleå tekniska universitet, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73868.

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Biogas is a promising alternative fuel with low CO2 emissions and high market potential due to the abundance of organic biomass. Despite being a renewable form of energy, biogas consists of 40-45% CO2, which lowers its calorific value [1]. Various porous materials have been tailored to adsorb CO2 gas from the biogas stream to obtain 95-97% biomethane. Zeolites are one of the promising porous materials that can contribute remarkably in the upgrading process by selectively adsorbing the CO2 gas from biogas [2]. The aim of this thesis is to develop hierarchical structures by novel approaches to enhance their CO2 adsorptive properties. The first part of the study addresses the tailoring of zeolites NaX and CaA binderless beads using the ion-exchange process to acquire high CO2 adsorption capacities of 5.1 mmol/g and 4.3 mmol/g at 298 K with the high mechanical strength of 2 MPa and 1.3 MPa respectively. The ion-exchange process was optimized for NaX and CaA zeolite to obtain high CO2-over-CH4 selectivity of 525 and 1775 respectively. The breakthrough experiments show that the partially ion-exchanged zeolite NaX has high mass transfer kinetics with a CO2 uptake rate of 2.8 mg of CO2/g/s as compared to the zeolite CaA binderless beads. The second part dealt with the structuring of zeolites using freeze granulation and electrospinning techniques. The freeze granulation process was optimized to form granules of 2-3 mm in diameter from NaX and CaA zeolite powder. The CO2-over-CH4 selectivities were investigated using Henry’s law and it shows that the NaX granules offer high selectivity of 214 than the CaA granule, 172 at 273 K and 100 kPa. No physical damage was observed when the granules were subjected to five cyclic breakthrough adsorption-desorption experiments at 4 bar. In addition, NaX granules offer a high uptake rate of 3.6 mg of CO2/g/s with a mass transfer coefficient of 1.3 m/s as compared to the CaA granules. To move further in structuring techniques, electrospinning was used to fabricate hierarchical porous structures. ZSM-5 nanofibers composites were developed from the ZSM-5 nanopowder and polyvinylpyrrolidone (PVP) polymer. Two-step post thermal treatments were carried out: Pre-oxidation and carbonization on ZSM-5 nanofibers composites to form mechanically strong composite structures. The post-carbonized structures showed a 30.4% increase in specific BET surface area than the ZSM-5 nanopowder with the CO2 uptake of 2.15 mmol/g. To investigate the CO2 separation properties, secondary pellet structures were developed with a tensile strength up to 6.46 MPa. The CO2 uptake rate for pellets was 2.3 mg of CO2/g/s without any performance decay after the first cycle with the simulated mass transfer coefficient of 1.24 m/s. [1] J Wang. Decentralized biogas technology of anaerobic digestion and farm ecosystem: Opportunities and challenges, Front.Energy Res. 2 (2014). [2] RV Siriwardane, M- Shen, EP Fisher, J Losch. Adsorption of CO 2 on zeolites at moderate temperatures, Energy Fuels. 19 (2005) 1153-1159.

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Pettersson, Viktor, and Alexander Jangenäs. "FRAMTIDENS FREKVENSOMRIKTARE : PRODUKTJÄMFÖRELSE OCH KONCEPTUTVECKLING." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14767.

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Griffith, Moumita. "Inspiring children and teenagers to pursue science and technology : A study in methods, activities, and toys that could potentially make technology and science interesting to children and teenagers." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-75896.

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This is a study in what motivates children and teenagers to pursue science and technology as future career choices. The subject is of relevance due to the increasing dependency on technology and the decline in engineering applications. Due to children and teenagers being the most susceptible targets for learning, they are the focal point in this study. The aim of this study is to identify what can create an interest in science and technology as well as to study to what extent a toy, game, or physical object can inspire children and teenagers (for product development purposes). The main research method in this study is a survey that has been filled in by 184 engineers. In addition to this, other research methods include interviews and a literature review. A majority of the respondents are from IKEA as this study has been conducted in collaboration with them. However, the result is intended to be used on a general level as the research questions are: ‘What can be used to create an interest in science and technology among children and teenagers?’ and ‘To what extent can a toy, game, or any other physical object inspire children and teenagers to pursue careers within the fields of science and technology while being gender neutral?’. Through analysing the collected data, it is evident that inspirational objects, inspirational people, and blended learning can be used to create an interest in these subjects. Furthermore, toys, games, and other physical objects can create an interest, however, the extent is decided based on how satisfied the child or teenager feels by interacting with the object.

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Martinez, Diego A. "Informing the Design and Deployment of Health Information Technology to Improve Care Coordination." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5987.

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In the United States, the health care sector is 20 years behind in the use of information technology to improve the process of health care delivery as compared to other sectors. Patients have to deliver their data over and over again to every health professional they see. Most health care facilities act as data repositories with limited capabilities of data analysis or data exchange. A remaining challenge is, how do we encourage the use of IT in the health care sector that will improve care coordination, save lives, make patients more involved in decision-making, and save money for the American people? According to Healthy People 2020, several challenges such as making health IT more usable, helping users to adapt to the new uses of health IT, and monitoring the impact of health IT on health care quality, safety, and efficiency, will require multidisciplinary models, new data systems, and abundant research. In this dissertation, I developed and used systems engineering methods to understand the role of new health IT in improving the coordination, safety, and efficiency of health care delivery. It is well known that care coordination issues may result in preventable hospital readmissions. In this dissertation, I identified the status of the care coordination and hospital readmission issues in the United States, and the potential areas where systems engineering would make significant contributions (see Appendix B). This literature review introduced me to a second study (see Appendix C), in which I identified specific patient cohorts, within chronically ill patients, that are at a higher risk of being readmitted within 30 days. Important to note is that the largest volume of preventable hospital readmissions occurs among chronically ill patients. This study was a retrospective data analysis of a representative patient cohort from Tampa, Florida, based on multivariate logistic regression and Cox proportional hazards models. After finishing these two studies, I directed my research efforts to understand and generate evidence on the role of new health IT (i.e., health information exchange, HIE) in improving care coordination, and thereby reducing the chances of a patient to be unnecessarily readmitted to the hospital. HIE is the electronic exchange of patient data among different stakeholders in the health care industry. The exchange of patient data is achieved, for example, by connecting electronic medical records systems between unaffiliated health care providers. It is expected that HIE will allow physicians, nurses, pharmacists, other health care providers and patients to appropriately access and securely share a patient’s vital medical information electronically, and thereby improving the speed, quality, safety and cost of patient care. The federal government, through the 2009 Health Information Technology for Economic and Clinical Health (HITECH) Act, is actively stimulating health care providers to engage in HIE, so that they can freely exchange patient information. Although these networks of information exchange are the promise of a less fragmented and more efficient health care system, there are only a few functional and financially sustainable HIEs across the United States. Current evidence suggests four barriers for HIE: •Usability and interface issues of HIE systems •Privacy and security concerns of patient data •Lack of sustainable business models for HIE organizations •Loss of strategic advantage of "owning" patient information by joining HIE to freely share data To contribute in reducing usability and interface issues of HIE systems, I performed a user needs assessment for the internal medicine department of Tampa General Hospital in Tampa, Florida. I used qualitative research tools (see Appendix D) and machine learning techniques (see Appendix E) to answer the following fundamental questions: How do clinicians integrate patient information allocated in outside health care facilities? What are the types of information needed the most for efficient and effective medical decision-making? Additionally, I built a strategic gaming model (see Appendix F) to analyze the strategic role of "owning" patient information that health care providers lose by joining an HIE. Using bilevel mathematical programs, I mimic the hospital decision of joining HIE and the patient decision of switching from one hospital to another one. The fundamental questions I tried to answer were: What is the role of competition in the decision of whether or not hospitals will engage in HIE? Our mathematical framework can also be used by policy makers to answer the following question: What are the optimal levels of monetary incentives that will spur HIE engagement in a specific region? Answering these fundamental questions will support both the development of user-friendly HIE systems and the creation of more effective health IT policy to promote and generate HIE engagement. Through the development of these five studies, I demonstrated how systems engineering tools can be used by policy makers and health care providers to make health IT more useful, and to monitor and support the impact of health IT on health care quality, safety, and efficiency.

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Nanto, Darack B. "The Eco-Smart Can." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/219.

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I noticed that the workers had the same itinerary when emptying trashcans, meanwhile trashcans needed urgently to be emptied. Traditionally, ETSU maintenance operate on daily routes to pick trash on designated time, regardless the level of the containers. This leads to overflown trashcan in busy areas or during rush hours in certain areas. This overflown trashcan result in an unclean environment for the community and an unpleasant look of our beautiful campus. The time, resources and labor invested in collecting the trash could be saved. Therefore, I decided to use the Internet of Things (IoT) to create a device that will optimize trash collection, to reduce costs and pollution. The Eco-Smart Can will contain a renewable source of energy such as the solar panel. Furthermore, it will have a compactor as well to decrease the trash volume. The system in the Eco-Smart can will give prior information of the trash level to maintenance facility so that they can empty the trash in a timely manner and preserve the environment.

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Jozsef, Daniel. "User Attitudes around Key Management, and their Impact on Blockchain Technology Adoption." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77065.

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The following study examines the background of users’ decisions about their behavior concerning online identity, specifically looking at the acceptance or rejection of self-sovereign identity solutions and the technologies that support them: blockchain and asymmetric encryption. A qualitative analysis is presented of typical user narratives concerning online behavior, while exploring the cultural values underlying users’ decisions about accepting or rejecting new, potentially emancipatory technologies. The results include inventories of values and beliefs that played a key part in informing the respondents’ behaviors, and presents four distilled narratives of reasoning about online identity in the form of the archetypes of the Pragmatist, the Self-doubter, the Cyber-conscious and the Futurist user, each representing a specific set of values, beliefs and their interplay resulting in specific intentions and behaviors, along with design guidelines for innovative blockchain technologies based on the user expectations in these narratives. The research concludes with relating the findings to existing theory, and proposing a number of quantitatively testable hypotheses for the refinement of technology acceptance research in the specific domain of online security and identity.

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Josimovic, Aleksandra. "AI as a Radical or Incremental Technology Tool Innovation." Thesis, KTH, Industriell Management, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230603.

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As researchers found that throughout the history a common challenge for companies across different industries, when it comes to leveraging and capturing value from a technology innovation is strongly influenced by the company’s dominant business model, an established framework through which assessment takes place. The overall purpose of this study is to provide a deeper understanding of the role that company's dominant business model has on the assessment of the impact that new technology innovation, in this case, AI, will have on the company and the market on which company operates. This thesis is partially exploratory and partially descriptive with a qualitative and deductive nature. In order to answer the purpose, a research strategy of case studies was used where empirical data was collected from interviews held with 47 company’s top executives from different hierarchical levels and business units, from Sweden, Switzerland, the USA, Germany, and Finland. The theoretical framework that describes the how AI as a new technology tool is perceived from the Company X perspective, either as a radical, game changer, or an incremental innovation technology tool and examines the role that dominant business model has on this perception was created. The developed implementation framework had its foundation in previous research concerning innovation business model theories. The data that was collected from the company’s executives were then analyzed and compared to the model. The most significant findings suggest that AI as a new technology tool is perceived as a game changer, radical innovation tool for some areas within the Company X and that the company dominant business model profoundly influences this perception.
Som forskare fann att genom hela historien är en gemensam utmaning för företag inom olika branscher när det gäller att utnyttja och fånga värde från en teknologisk innovation starkt påverkad av företagets dominerande affärsmodell, en etablerad ram genom vilken bedömning sker. Det övergripande syftet med denna studie är att ge en djupare förståelse för den roll som företagets dominerande affärsmodell har vid bedömningen av den inverkan som ny teknik innovation, i detta fall AI, kommer att ha på företaget och marknaden där företaget driver . Denna avhandling är delvis undersökande och delvis beskrivande med kvalitativ och deduktiv natur. För att svara på målet användes en forskningsstrategi av fallstudier där empiriska data samlades in från intervjuer med 47 bolagets ledande befattningshavare från olika hierarkiska nivåer och affärsenheter, från Sverige, Schweiz, USA, Tyskland och Finland. Den teoretiska ram som beskriver hur AI som ett nytt teknikverktyg uppfattas ur företagets Xperspektiv, antingen som en radikal, spelväxlare eller ett inkrementellt innovationsteknologiprogram och undersöker den roll som dominerande affärsmodell har på denna uppfattning skapades. Den utvecklade implementeringsramen har grundat sig i tidigare forskning rörande innovationsmodellteorier. Data som samlades in från företagets chefer analyserades sedan och jämfördes med modellen. De viktigaste resultaten tyder på att AI som ett nytt teknikverktyg uppfattas som en spelväxlare, radikalt innovationsverktyg för vissa områden inom företaget X och att företagets dominerande affärsmodell påverkar denna uppfattning väsentligt.

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Pinho, César Alexandre da Costa. "Tactode programming for robotics and other targets." Dissertação, 2021. https://hdl.handle.net/10216/135616.

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Pinho, César Alexandre da Costa. "Tactode programming for robotics and other targets." Master's thesis, 2021. https://hdl.handle.net/10216/135616.

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Teixeira, Jorge Daniel Grenha. "Designing Technology-Enabled Services with Model-based Methods." Tese, 2015. https://repositorio-aberto.up.pt/handle/10216/78684.

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Teixeira, Jorge Daniel Grenha. "Designing Technology-Enabled Services with Model-based Methods." Doctoral thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/78684.

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Cardoso, Ângela Filipa Pereira. "Tangible language for educational programming of robots and other targets." Master's thesis, 2019. https://hdl.handle.net/10216/119132.

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Barbosa, Ricardo Daniel Nogueira. "Configuring Supply Chain Networks in Technology-based Start-ups." Dissertação, 2016. https://repositorio-aberto.up.pt/handle/10216/84425.

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Valente, Tiago Garrido Lima Allen. "Process Improvement Program in a Technology & Software Company." Dissertação, 2020. https://hdl.handle.net/10216/132637.

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Barbosa, Ricardo Daniel Nogueira. "Configuring Supply Chain Networks in Technology-based Start-ups." Master's thesis, 2016. https://repositorio-aberto.up.pt/handle/10216/84425.

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Valente, Tiago Garrido Lima Allen. "Process Improvement Program in a Technology & Software Company." Master's thesis, 2020. https://hdl.handle.net/10216/132637.

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Gomes, Guilherme Cerqueira. "Supporting ubiquitous and fully decentralized outbound logistics through blockchain technology." Dissertação, 2018. https://repositorio-aberto.up.pt/handle/10216/113581.

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Macedo, Marcela Martins Costa. "The Implications of Interactive E-Paper Technology on Public Transportation." Dissertação, 2021. https://hdl.handle.net/10216/135082.

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Vilanova, Mariana Vitória Nogueira. "Evoking a Simulated Past: technology and manipulation of human memory." Dissertação, 2021. https://hdl.handle.net/10216/136020.

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A memória é uma das características fundamentais do ser humano, ela molda a nossa personalidade e permite-nos reagir às experiências da vida. Ao longo da História, os seres humanos têm vindo a procurar formas de melhorar as suas capacidades cognitivas, contando com mecanismos e dispositivos externos, como a escrita e a produção de imagens. No século vinte e um, a memória humana não pode ser separada da tecnologia digital, já que armazenamos constantemente registos das nossas experiências em smartphones e computadores. Hoje, temos acesso a quase toda a informação do mundo nos nossos bolsos, o que nos leva a confiar demasiado na tecnologia para armazenar as nossas memórias. Mas esse acesso a toda essa informação está a transformar a maneira como formamos, armazenamos e reconstruímos memórias. Apesar de termos registos de várias memórias do dia-a-dia, a capacidade do nosso cérebro de formar novas memórias está a mudar, tornando-nos mais esquecidos. Partindo destas ideias, desenvolvemos uma instalação multimédia que explora processos de reconstrução e associação de memórias, e um ensaio crítico que potencie o questionamento sobre a tecnologia e a manipulação da memória humana. Os nossos objectivos principais são pesquisar sobre o cérebro humano, a memória humana e a sua relação com as emoções; pesquisar sobre práticas arquivísticas; e pesquisar sobre o impacto das tecnologias da memória; a fim de potenciar o questionamento e gerar discussão sobre o impacto da tecnologia na memória humana individual e os seus possíveis efeitos. A instalação, denominada Evoking a Simulated Past, é descrita nesta dissertação, bem como o processo criativo e as contribuições da pesquisa sobre a memória humana e as práticas arquivísticas para a implementação do projecto.
Memory is one of the fundamental characteristics of human beings, it shapes our personality and allows us to react to life experiences. Throughout History human beings have been looking for ways to enhance their cognitive abilities by relying on mechanisms and external devices, such as writing and picture-making. In the 21st century human memory cannot be separated from digital technology, as we constantly store records of our daily experiences in smartphones and computers. Today, we have access to almost all the information of the world in our pockets which leads us to trust too much on technology to store our memories. But the access to all that information is changing how we form, store and reconstruct memories. While we have recordings of our daily memories in our smartphones and computers, the ability of our brain to form new memories is changing, making us more forgetful. Regarding these ideas, we developed a multimedia installation that explores processes of memory reconstruction and association and a critical essay that fosters the questioning about technology and manipulation of human memory. Our main goals are to research on the human brain; the human memory and its relationship with emotions; research on archival practices; research on the impact of technologies on human memory; in order to foster the questioning and generate discussion about the impact of technology on the individual memory and its possible outcomes. The installation, named Evoking a Simulated Past, is described in this dissertation as well as the creative process and how the research on human memory and archival practices contributed to its implementation.

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Heymann, Fabian. "Technology diffusion models in power system planning and policy design." Tese, 2020. https://hdl.handle.net/10216/127454.

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Gomes, Guilherme Cerqueira. "Supporting ubiquitous and fully decentralized outbound logistics through blockchain technology." Master's thesis, 2018. https://repositorio-aberto.up.pt/handle/10216/113581.

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Heymann, Fabian. "Technology diffusion models in power system planning and policy design." Doctoral thesis, 2020. https://hdl.handle.net/10216/127454.

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Macedo, Marcela Martins Costa. "The Implications of Interactive E-Paper Technology on Public Transportation." Master's thesis, 2021. https://hdl.handle.net/10216/135082.

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Dissertations / Theses on the topic 'Other Engineering and Technology'

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