Academic literature on the topic 'Single collector efficiency'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Single collector efficiency.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Single collector efficiency"
1
Karim, M. A., and Z. M. Amin. "MATHEMATICAL MODELLING AND PERFORMANCE ANALYSIS OF DIFFERENT SOLAR AIR COLLECTORS." IIUM Engineering Journal 16, no. 2 (November 30, 2015): 43–55. http://dx.doi.org/10.31436/iiumej.v16i2.603.
Full textAbstract:
The purpose of using solar air collectors is to raise the atmospheric air temperature to a temperature which can be used for various low and medium temperature applications. Collector, absorber and airflow arrangement are the most important components in the solar air collector. The performance of the collector depends on its heat loss and the absorber area that is in contact with the airflow. This study involves the theoretical simulation of the effect of mass flow rate on the performance, for flat plate and v-groove collectors that are in single and double pass configurations. Results show that the v-groove double pass air collector has the highest efficiency value of 56% at . The performance is greater than flat plate double pass collector, which has an efficiency of 54% under the same operating conditions. KEYWORDS: solar air collector; flat plate collector (fpc); v-groove collector; efficiency; single pass; double pass
2
Habtay, Gedion, Maytham A. Al-Neama, Janos Buzas, and Istvan Farkas. "Experimental Performance of Solar Air Heaters for Drying Applications." European Journal of Energy Research 1, no. 5 (December 13, 2021): 4–10. http://dx.doi.org/10.24018/ejenergy.2021.1.5.29.
Full textAbstract:
This paper presents the results of an experimental investigation on an indirect active type of solar dryer, using two distinct solar air collector and their impacts on drying agricultural products. The thermal performance of the proposed collectors has been evaluated using the first and second laws of thermodynamics. Experimental observations were done in climatic conditions Gödöllő, Hungary on the 2nd and 9th of October 2017. The experiments were also carried out to dry 2 kg of sliced apples spread over the drying trays. The mas flow rate of air was maintained as 0.038 kg/s and the dryer was operated from 10:00 a.m. to 3:00 p.m. When a double-pass solar air collector's results are compared to a single-pass solar air collector's, it's evident that the double-pass solar air collector produces much more energy and efficiency. The experimental results showed that single-pass and double-pass collectors have daily efficiencies of 42.77% and 56.10%, respectively, with average exergy efficiency values ranging from 31% to 49% for single-pass and 51% to 67% for double-pass. The most significant aspect determining the collectors' thermal efficiency was the temperature rise between the collector outlet and inlet. The average drying efficiencies of the solar dryer for the single and double-pass collectors were evaluated as 12.16% and 16.45%, respectively. The maximum temperature rise for double-pass was determined to be 20 °C, whereas single-pass was found to be 6.5 °C. Furthermore, the highest drying rate was achieved when sliced apples were dried with a double-pass collector mode. It reduced 52% of the water content in the apple in the same amount of time as single-pass drying, compared to 35% in the case of single-pass drying.
3
Wu, Lei, Bin Gao, Rafael Muñoz-Carpena, and Yakov A. Pachepsky. "Single Collector Attachment Efficiency of Colloid Capture by a Cylindrical Collector in Laminar Overland Flow." Environmental Science & Technology 46, no. 16 (July 27, 2012): 8878–86. http://dx.doi.org/10.1021/es301365f.
Full text
4
Taqi, Rafal N., Zeina Ali Abdul Redha, and Falah Ibrahim Mustafa. "Experimental Investigation of a Single Basin -Single Slope Solar Still Coupled with Evacuated Tube Solar Collector." Journal of Engineering 27, no. 6 (June 1, 2021): 16–34. http://dx.doi.org/10.31026/j.eng.2021.06.02.
Full textAbstract:
This work is an experimental investigation for single basin-single slope solar still coupled with an evacuated tube solar collector. The work is carried out under the climatic conditions of Baghdad city (33.2456º North and East latitude, 44.3337º longitude) through certain days of the months of the year 2019 to study the impact of using evacuated tube solar collector on the daily productivity and efficiency under the outdoors climatic conditions. It was found that using the evacuated tube solar collector increase daily productivity from 2.175 kg/ to 2.95 kg/ for 9 hours (35.63 %) for clear days, also an enhancement about 10.97 % in daily efficiency.
5
Yazdi, Mohammad H., Evgeny Solomin, Ahmad Fudholi, Ghasem Divandari, Kamaruzzaman Sopian, and Perk Lin Chong. "Thermal Performance of Nanofluid Flow Inside Evacuated Tube Solar Collector." International Journal of Heat and Technology 39, no. 4 (August 31, 2021): 1262–70. http://dx.doi.org/10.18280/ijht.390424.
Full textAbstract:
Solar collectors are systems for absorbing the sun's radiant energy and converting it into heat. The working principle of solar collectors are relying on the solar radiation incident upon the transparent surface, and the collected radiation heat is stored within the operating fluid. However, the conventional operating fluid is less than satisfactory in term of promoting the thermal efficiency of solar collector. Consequently, the aim of this paper is to investigate the use of nanofluid as an operating fluid in a single end evacuated solar collector. The expectation is that the flow behavior of nanofluid can lead to the improvement of thermal efficiency of solar collector. The design of solar collector is carried out using Gambit software and the heat transfer characteristics are simulated by nanofluid flow with 1%, 3% and 5% volumes by ANSYS Fluent software. The results demonstrate good agreement with existing experimental results. The numerical analysis shows the improvement of collector performance compared to pure water fluid. The results show that by increasing the nanoparticles volume fraction the efficiency of the collector improves significantly.
6
Akram, Shakeel, Farhan Hameed Malik, Rui Jin Liao, Bin Liu, and Tariq Nazir. "Microcontroller Based Single Axis Intelligent Control Sun Tracker for Parabolic Trough Collectors." Advanced Materials Research 562-564 (August 2012): 1772–75. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1772.
Full textAbstract:
Due to the complex design and high costs of production, solar thermal systems have fallen behind in the world of alternative energy systems. Different mechanisms are applied to increase the efficiency of the solar collectors and to reduce the cost. Solar tracking system is the most appropriate technology to increase the efficiency of solar collectors as well as solar power plants by tracking the sun timely. In order to maximize the efficiency of collectors, one needs to keep the reflecting surface of parabolic trough collectors perpendicular to the sun rays. For this purpose microcontroller based real time sun tracker is designed which is controlled by an intelligent algorithm using shadow technique. The aim of the research project is to test the solar-to-thermal energy efficiency by tracking parabolic trough collector (PTC). The energy efficiency is determined by measuring the temperature rise of working fluid as it flows through the receiver of the collector when it is properly focused. The design tracker is also simulated to check its accuracy. The main purpose to design this embedded system is to increase the efficiency and reliability of solar plants by reducing size, complexity and cost of product.
7
Hengel, Franz, Christian Heschl, Franz Inschlag, and Peter Klanatsky. "System efficiency of PVT-collector driven heat pumps." E3S Web of Conferences 116 (2019): 00026. http://dx.doi.org/10.1051/e3sconf/201911600026.
Full textAbstract:
Standard heat pump (HP) systems with horizontal ground heat exchangers (HGHE) are commonly designed based on arbitrary knowledge gained over time and the use of the rule of thumb. Where an undersizing of the HGHE occurs, the HP efficiencies are lowered. Undersizing could result as a consequence of underestimating the soils thermal conductivity. Therefore, this paper considers the combined photovoltaic and solar thermal (PVT) collectors as an extension to standard HP heating systems with a HGHE in single-family houses with the possibility of improving the COP of the HP at a later stage and effortlessly. With the implemented hydronic scheme, the PVT-collector is also used to regenerate the soil around the ground to increase the temperature level of the heat source resulting in improved performance. However, the efficiency potential of the PV-Cells due to active cooling of the modules is analyzed. The results show an increase of the seasonal performance factor (SPF) of 4.1 % and higher electric energy output of 4.4% due to active cooling of the PV-Cells while energy consumption of the regeneration pump is covered.
8
Liu, Xiaoyan, Jing Huang, and Qianjun Mao. "Sensitive Analysis for the Efficiency of a Parabolic Trough Solar Collector Based on Orthogonal Experiment." International Journal of Photoenergy 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/151874.
Full textAbstract:
A multitude of the researches focus on the factors of the thermal efficiency of a parabolic trough solar collector, that is, the optical-thermal efficiency. However, it is limited to a single or double factors for available system. The aim of this paper is to investigate the multifactors effect on the system’s efficiency in cold climate region. Taking climatic performance into account, an average outlet temperature of LS-2 collector has been simulated successfully by coupling SolTrace software with CFD software. Effects of different factors on instantaneous efficiency have been determined by orthogonal experiment and single factor experiment. After that, the influence degree of different factors on the collector instantaneous efficiency is obtained clearly. The results show that the order of effect extent for average maximal deviation of each factor is inlet temperature, solar radiation intensity, diameter, flow rate, condensation area, pipe length, and ambient temperature. The encouraging results will provide a reference for the exploitation and utilization of parabolic trough solar collector in cold climate region.
9
Hassan, Abdulsalam D. M., and Rwaa Alaa Hussein. "The Variation Effect of Collector Tilt Angle on the Heat Pipe Solar Collector Performance." Wasit Journal of Engineering Sciences 6, no. 2 (August 30, 2018): 21–27. http://dx.doi.org/10.31185/ejuow.vol6.iss2.88.
Full textAbstract:
The thermal performance of FPHPSC has been studied experimentally and theoretically. The collector consists of copper absorber plate, single glass cover, glass wool insulation and aluminum case, ten wickless heat pipes of 12.7 mm inner diameter. The experimental studies of collector performance have been performed on four different CTA (22°, 32°, 45° and 60°). The relation between the solar intensity and the collector energy losses are also discussed. The collector are tested under the climate condition of Kut city (32.602 latitude and 45.752 longitude). It is investigated that the increasing of CTA increase the efficiency of collector up to certain limit after that the efficiency decreases with the increasing of tilt angle of collector. A computer program which is based on VISUAL BASICE language (version 6) is made for the theoretical analysis. The experimental results agree reasonably with the theoretical predictions.
10
Ji, Xu, Ming Li, Weidong Lin, Tufeng Zheng, and Yunfeng Wang. "Effect of Installation of Solar Collector on Performance of Balcony Split Type Solar Water Heaters." International Journal of Photoenergy 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/865041.
Full textAbstract:
The influences of surface orientation and slope of solar collectors on solar radiation collection of balcony split type solar water heaters for six cities in China were analyzed by employing software TRNSYS. The surface azimuth had greater effect on solar radiation collection in high latitude regions. For deviation of the surface slope angle within ±20° around the optimized angle, the variation of the total annual collecting solar radiation was less than 5%. However, with deviation of 70° to 90°, the variation was up to 20%. The effects of water cycle mode, reverse slope placement of solar collector, and water tank installation height on system efficiency were experimentally studied. The thermal efficiencies of solar water heater with single row horizontal arrangement all-glass evacuated tubular collector were higher than those with vertical arrangement at the fixed surface slope angle of 90°. Compared with solar water heaters with flat-plate collector under natural circulation, the system thermal efficiency was raised up to 63% under forced circulation. For collector at reverse slope placement, the temperature-based water stratification in water tank deteriorated, and thus the thermal efficiency became low. For improving the system efficiency, an appropriate installation height of the water tank was suggested.
Dissertations / Theses on the topic "Single collector efficiency"
1
Tian, Feng. "SOLAR-BASED SINGLE-STAGE HIGH-EFFICIENCY GRID-CONNECTED INVERTER." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3503.
Full textAbstract:
Renewable energy source plays an important role in the energy cogeneration and distribution. Traditional solar-based inverter system is two stages in cascaded, which has a simpler controller but low efficiency. A new solar-based single-stage grid-connected inverter system can achieve higher efficiency by reducing the power semiconductor switching loss and output stable and synchronized sinusoid current into the utility grid. Controlled by the digital signal processor, the inverter can also draw maximum power from the solar array, thereby maximizing the utilization of the solar array. In Chapter 1, a comparison between the traditional two-stage inverter and the single-stage inverter is made. To increase the ability of power processing and enhance the efficiency further, a full-bridge topology is chosen, which applies the phase-shift technique to achieve zero-voltage transition. In Chapter 2, average-mode and switch-mode Pspice simulations are applied. All the features of the inverter system are verified, such as stability, zero voltage transition and feed-forward compensation, etc. All these simulation results provide useful design tips for prototyping. In Chapter 3, a phase-shift controller is designed based on UCC3895. Also, a detailed design procedure is given, including key components selection, transformer and inductor design and driver circuits design. In Chapter 4, experimental results of a prototype DC/DC converter are presented and analyzed. By optimization of the circuit, the problems of the prototype are solved and the prototype is working stably. The thesis' conclusion is given in Chapter 5.M.S.E.E.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Electrical Engineering
2
Rodriguez, Garrigues Alvar. "Development of an Efficient Molecular Single-Electron Transport Spectroscopy." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5694.
Full textAbstract:
In this thesis I present a complete and detailed guide for the development process and fabrication of efficient single-electron transistors (SETs) and a better single-molecule magnets (SMMs) deposition yield. Starting from a commercial Si/SiO2 wafer I show the steps for the deposition of different layers to fabricate a SET as well as the improvements achieved in those for a completely functional SET device. The development process is based on a combination of optical lithography and e-beam lithography with metal deposition in ultra-high vacuum. The improvements involve a better conductance in the Al gate component, with a controlled formation of the superficial oxide layer and a faster feedback electromigration-induced breaking of Au nanowires for the creation of nanogaps at room temperature. The gate component is improved by increasing its thickness and exposing it to plasma oxidation for the complete oxidation of its surface. The nanowire breaking is realized at room temperature to make use of the surface tension of Au, which, after a previous feedback procedure, eventually opens the final gap in the nanowire. Finally, I demonstrate a new technique that allows increasing the yield of having a SMM connected in the nanowire gap. This new technique is based on monitoring the resistance of the broken nanowires during the SMM deposition from a controlled liquid solution at room temperature. When the resistance (>G? for open gaps) drops to values below Mega-ohms (characteristic resistance of a molecule bridging the gap) for a number of nanowires in the chip, the device is then ready for low temperature measurements.M.S.
Masters
Physics
Sciences
Physics
3
Niederbracht, Hendrik [Verfasser]. "Process approaches for on-chip excitation and enhancing the optical collection efficiency of quantum dot based single-photon emitters / Hendrik Niederbracht." München : Verlag Dr. Hut, 2016. http://d-nb.info/1120764092/34.
Full text
4
Sivaram, Varun. "Simulation, synthesis, sunlight : enhancing electronic transport in solid-state dye-sensitized solar cells." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:0824a954-e9a9-4f14-a6b4-675652d01d4e.
Full textAbstract:
The solid-state dye sensitized solar cell (SDSC) is an emerging photovoltaic technology which promises inexpensive materials, roll-to-roll processing, and a stable architecture. In this thesis, I seek to enhance electronic transport in order to enable thicker devices and yield higher power conversion efficiencies. I adopt a multipronged approach to advance three aims, employing analytical, computational, and experimental methodologies. First, I generalize existing models of the dye sensitized solar cell (DSSC) to allow simple parameter fitting of real devices and to account for previously ignored electronic processes. In Chapter 3 and Chapter 4 I present a nondimensional model capable of fitting real devices and simulating transient behavior without extensive material knowledge. Subsequently in Chapter 5, I introduce a novel three-dimensional model which incorporates electronic drift. Second, in Chapter 4 I critically assess a widespread method of measuring the charge collection efficiency, the summary metric that describes the efficacy of charge transport in the SDSC. I discover that the conventional method is inaccurate for values of the collection efficiency below 90% because of large experimental error and an intrinsic inaccuracy in applying a transient method to measure a steady-state parameter. Third, I aim to increase the rate of charge transport by employing new materials and nanostructures in the place of conventional nanocrystalline TiO2. In Chapter 5, I present evidence of faster transport and enhanced efficiency in flexible SnO2 nanowire SDSCs, ZnO nanowire SDSCs, and the first viable SnO2/P3HT SDSC, where photoanode and hole transporter have been replaced with higher mobility materials. Finally, in Chapter 6, I investigate use of TiO2 mesoporous single crystals (MSCs) with high surface area and extended crystallinity. After demonstrating the viability of MSCs in SDSCs, I examine enhanced transport caused by the background doping effect of thermal treatment. Together, the progress achieved toward diverse and ambitious goals advances the field and delineates routes to future progress for SDSC development.
Books on the topic "Single collector efficiency"
1
Wright, A. G. Collection and counting efficiency. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199565092.003.0010.
Full textAbstract:
Standards laboratories can provide a photocathode calibration for quantum efficiency, as a function of wavelength, but their measurements are performed with the photomultiplier operating as a photodiode. Each photoelectron released makes a contribution to the photocathode current but, if it is lost or fails to create secondary electrons at d1, it makes no contribution to anode current. This is the basis of collection efficiency, F. The anode detection efficiency, ε, allied to F, refers to the counting efficiency of output pulses. The standard method for determining F involves photocurrent, anode current, count rate, and the use of highly attenuating filters; F may also be measured using methods based on single-electron responses (SERs), shot noise, or the SER at the first dynode.
2
Williams, ER, AC Matheson, and CE Harwood. Experimental Design and Analysis for Tree Improvement. CSIRO Publishing, 2002. http://dx.doi.org/10.1071/9780643090132.
Full textAbstract:
Experimental Design and Analysis for Tree Improvement provides a set of practical procedures to follow when planning, designing and analysing tree improvement trials.
Using many fully-worked examples, it outlines how to: design field, glasshouse and laboratory trials; efficiently collect data and construct electronic data files; pre-process data, screening for data quality and outliers; analyse data from single and across-site trials using either GenStat or SAS; and interpret the results from statistical analyses.
The authors address the many practical issues often faced in forest tree improvement trials and describe techniques that will give conclusive results with the minimum expense. The techniques provided are applicable to the improvement of not only trees, but to crops in general.
Building on the success of the first edition, this new edition has been fully revised and updated to relate to the latest commercially-available software packages for design generation (CycDesigN) and data pre-processing and automated generation of programs for statistical analysis (DataPlus). For analysis, it now provides both GenStat and SAS programs as generated by DataPlus.
3
Márquez-Peláez, Sergio, Juan Antonio Blasco-Amaro, and Mª José Aguado-Romeo. Incompatible living-donor kidney transplantation (an update). AETSA Área de Evaluación de Tecnologías Sanitarias de Andalucía, Fundación Progreso y salud. Consejería de Salud y Familias. Junta de Andalucía, 2022. http://dx.doi.org/10.52766/kpnf6027.
Full textAbstract:
Background This report responds to a need to update the available information about incompatible living-donor kidney transplantation (LDKT) previously published in 2014 which, based on 14 case series and 1 cohort study, concluded that this type of transplants could be a therapeutic option with survival, graft and patient outcomes, adequate and similar to a compatible living-donor kidney transplant, however, these report only included ABO-incompatible information. Objective The purpose of the report is to provide updated evidence on effectiveness and safety in terms of graft survival and survival of patients undergoing incompatible LDKT. Method To answer the question a systematic review of the literature was carried out, by updating the structured searches of the previous existing report. The selection of the references was carried out first by title and abstract. Next, the full-text papers were selected by applying the inclusion and exclusion criteria, defined a priori, by a single researcher. In the same way, we proceeded to extract the data from the articles finally selected, and their synthesis in tables similar to those of the previous report, with special attention to the HLA incompatibility LDKT data, since no information was collected in the previous report. Results From 232 localized references, 35 papers on incompatible LDKT have finally been included, 16 with information on HLAi transplant patients and 19 with ABO incompatible transplant patients. In all cases, case series with or without a control group and a very limited number of patients were treated, only 1 study registered more than 1000 patients undergoing incompatible LDKT in 22 centers (Orandi et al. 2014) in the case of HLAi. The information on graft survival in patients undergoing HLA-incompatible LDKT at 1 year is between 90 % (Laftavi et al. 2011) and 100 % (Blumberg et al. 2013; Yamanaga et al. 2013), while the data recorded over five years survival were lower, from 69 % (Couzi et al. 2015) to 94.7 % (Jakson et al. 2015). The 1-year patient survival registered was found between 90.5 % by Sharif et al. 2014 and 100 % (Blumberg et al. 2013 and Laftavi et al. 2011). The 5-year patient survival recorded is in the range of 59.2 % (in one of the subgroups described by Orandi et al. ) when the other HLAi subgroup does offer similar figures to the rest of the studies, around 86 % survival and the 5-year value provided by Kim et al. which registered 95.8 %. In general, for LDKT with ABO incompatibility, the results of the previous review from 2012 are maintained, with a 1-year graft survival in ABOi-type living donor kidney transplants recorded in up to 8 of the 19 included studies and one 84 % minimum (Bachmann et al. 2018). For patient survival at 1 year, it is 100 % or very close in all the studies on ABOi and figures are high, but somewhat lower, for patient survival at five years (between 92 % of Melexopoulus et al. and 97.7 % from Subramanian et al.). Conclusions There is great variability in the information presented by the studies, so that it make difficult to group together. The quality of the evidence is very limited, as these are case series studies with a high risk of bias, many without a control group, and others with comparative cohort results (historical retrospectives). However, the results shown are consistent and the claims of the previous 2012 report are maintained. Graft survival and patient survival for patients undergoing HLA-incompatible LDKT are high and comparable to values offered by ABOi transplants and ABO compatible transplants. In the studies on LDKT with ABOi data, the results collected on both survival variables maintain the statements of the previous report, remaining at high values. A single localized study about economic efficiency aspects was carried out in the United States, the authors conclude that the LDKT can be an efficient option in terms of cost per QALY, although this conclusion is not directly transferable to our National Health System.
4
Touchon, Justin C. Applied Statistics with R. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198869979.001.0001.
Full textAbstract:
Whether at the undergraduate, graduate, or post-graduate level, Applied Statistics with R: A Practical Guide for the Life Sciences teaches readers to properly analyze data in an efficient, accessible, plainspoken, frank, and occasionally humorous manner. Readers will come away with the knowledge of which analyses they should use and when they should use them, an important skill in an age when the statistical analyses used in the life-sciences are becoming increasingly advanced. This book uses the statistical language R, which is the choice of ecologists worldwide and is rapidly becoming the ‘go-to’ stats program throughout the life-sciences. Written around a single real-world dataset, Applied Statistics with R which encourages readers to become deeply familiar with an imperfect but realistic set of data, much like they themselves might collect. Early chapters are designed to teach basic data manipulation skills and build good habits in preparation for learning more advanced analyses. This approach also demonstrates the importance of viewing data through different lenses, facilitating an easy and natural progression from linear and generalized linear models through to mixed effects versions of those same analyses. Readers will also learn advanced plotting and data-wrangling techniques, and gain an introduction to writing their own functions. Applied Statistics with R is suitable for senior undergraduate and graduate students, professional researchers, and practitioners throughout the life-sciences, whether in the fields of ecology, evolution, environmental studies, or computational biology.
5
Burman, Leonard E., and Joel Slemrod. Taxes in America. Oxford University Press, 2020. http://dx.doi.org/10.1093/wentk/9780190920869.001.0001.
Full textAbstract:
Arguments about taxation are among the most heated-no other topic is as influential to the role of government and the distribution of costs and benefits in America. But while understanding of our tax system is of vital importance, the complexity can create confusion. Two of America's leading authorities on taxes, Leonard E. Burman and Joel Slemrod, bring clarity in this concise explanation of how our tax system works, how it affects people and businesses, and how it might be improved. The book explores what makes a tax system fair, simple, and efficient, why our system falls short, and whether the new tax law promises much, if any, improvement. Accessibly written and organized in a clear, question-and-answer format, the book describes the intricacies of the modern tax system in an easy-to-grasp manner. It has been revised and updated to both explain the Tax Cuts and Jobs Act (TCJA) in 2017, the most comprehensive reform of its income tax system since 1986, and to examine its likely effects on individuals, businesses, and society. Among the questions discussed are: How much more tax could the IRS collect with better enforcement? How do tax burdens vary around the world? Why do corporations pay so little tax, even though they earn trillions of dollars every year? What kind of tax system is most conducive to economic growth? And, can taxes be fair?
Book chapters on the topic "Single collector efficiency"
1
Pilsl, Michael, Florian B. Heiss, Gisela Pöll, Mona Höcherl, Philipp Milkereit, and Christoph Engel. "Preparation of RNA Polymerase Complexes for Their Analysis by Single-Particle Cryo-Electron Microscopy." In Ribosome Biogenesis, 81–96. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2501-9_6.
Full textAbstract:
AbstractRecent technological progress revealed new prospects of high-resolution structure determination of macromolecular complexes using cryo-electron microscopy (cryo-EM). In the field of RNA polymerase (Pol) I research, a number of cryo-EM studies contributed to understanding the highly specialized mechanisms underlying the transcription of ribosomal RNA genes. Despite a broad applicability of the cryo-EM method itself, preparation of samples for high-resolution data collection can be challenging. Here, we describe strategies for the purification and stabilization of Pol I complexes, exemplarily considering advantages and disadvantages of the methodology. We further provide an easy-to-implement protocol for the coating of EM-grids with self-made carbon support films. In sum, we present an efficient workflow for cryo-grid preparation and optimization, including early stage cryo-EM screening that can be adapted to a wide range of soluble samples for high-resolution structure determination.
2
Torotcoi, Simona, Delia Gologan, and Anastasia Kurysheva. "What Works for Underrepresented Groups? Identifying Effective Measures for Enhancing Access to Higher Education in Europe." In European Higher Education Area: Challenges for a New Decade, 177–96. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-56316-5_13.
Full textAbstract:
Abstract Over the last three decades, policy-makers have developed numerous measures, policies, projects and programs with the intention to increase the enrolment and participation of underrepresented groups, however, little is known about the ways in which such initiatives shape opportunities for potential students. Knowing which of these initiatives work and whether they are achieving their intended goals is of utmost importance for policy-makers across Europe. This paper aims to collect, document, scrutinize and critically analyze the current research literature which assesses the effectiveness of different public initiatives at Higher Education Institutions’ (HEIs) level for widening access for underrepresented groups and, at the same time, to identify gaps and make recommendations for potential further research. The 17 identified studies can be categorized based on the access measures they analyze: (1) outreach, counselling and mentoring of prospective students; (2) financial aid measures, and (3) preparatory courses and programs. The findings show that there are little research and information about the actual outcomes of most measures to increase access to HE. We found a lack of adequate, reliable and consistently collected data about the policy instruments already put to practice. Since there is no excuse for the lack of effective action towards more equitable educational systems, more evidence-based approaches will be necessary to learn from these specific access measures and move forward towards more efficient equity policies.
3
Dawar, Kshitij, Sanjay Srinivasan, and Mort D. Webster. "Application of Reinforcement Learning for Well Location Optimization." In Springer Proceedings in Earth and Environmental Sciences, 81–110. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-19845-8_7.
Full textAbstract:
AbstractThe extensive deployment of sensors in oilfield operation and management has led to the collection of vast amounts of data, which in turn has enabled the use of machine learning models to improve decision-making. One of the prime applications of data-based decision-making is the identification of optimum well locations for hydrocarbon recovery. This task is made difficult by the relative lack of high-fidelity data regarding the subsurface to develop precise models in support of decision-making. Each well placement decision not only affects eventual recovery but also the decisions affecting future wells. Hence, there exists a tradeoff between recovery maximization and information gain. Existing methodologies for placement of wells during the early phases of reservoir development fail to take an abiding view of maximizing reservoir profitability, instead focusing on short-term gains. While improvements in drilling technologies have dramatically lowered the costs of producing hydrocarbon from prospects and resulted in very efficient drilling operations, these advancements have led to sub-optimal and haphazard placement of wells. This can lead to considerable number of unprofitable wells being drilled which, during periods of low oil and gas prices, can be detrimental for a company’s solvency. The goal of the research is to present a methodology that builds machine learning models, integrating geostatistics and reservoir flow dynamics, to determine optimum future well locations for maximizing reservoir recovery. A deep reinforcement learning (DRL) framework has been proposed to address the issue of long-horizon decision-making. The DRL reservoir agent employs intelligent sampling and utilizes a reward framework that is based on geostatistical and flow simulations. The implemented approach provides opportunities to insert expert information while basing well placement decisions on data collected from seismic data and prior well tests. Effects of prior information on the well placement decisions are explored and the developed DRL derived policies are compared to single-stage optimization methods for reservoir development. Under similar reward framework, sequential well placement strategies developed using DRL have been shown to perform better than simultaneous drilling of several wells.
4
Vaiciukynaite, Egle, Ineta Zickute, and Justas Salkevicius. "Solutions of Brand Posts on Facebook to Increase Customer Engagement Using the Random Forest Prediction Model." In FGF Studies in Small Business and Entrepreneurship, 191–214. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11371-0_9.
Full textAbstract:
AbstractThis paper aims to predict customer engagement behaviour (CEB), i.e. likes, shares, comments, and emoji reactions, on company posts on Facebook. A sample of 1109 brand posts from Facebook pages in Lithuania was used. The Random Forest method was used to train models to predict customer engagement behaviour based on features including time frame, content, and media types of brand posts. The data was used for training nine binary classification models using the Random Forest method, which can predict the popularity of a company’s posts. In terms of social score, accuracy of likes, comments, and shares varied from 68.4% (likes on a post) to 84.0% (comments on a post). For emotional responses, accuracy varied from 65.6% (‘wow’ on a post) to 82.5% (‘ha ha’ on a post). The data was collected from one single media platform and country, and encompassed emotional expressions at an early stage on Facebook. The findings of Random Forest prediction models can help organisations to make more efficient solutions for brand posts on Facebook to increase customer engagement. This paper outlines the first steps in creating a predictive engagement score towards diverse types of brand posts on Facebook. The same approach to features of brand posts might be applied to other social media platforms such as Instagram and LinkedIn.
5
Inoue, Nozomu, Shigeru Matsumoto, and Minoru Morita. "Inequalities in the Impact of the Carbon Tax in Japan." In Economics, Law, and Institutions in Asia Pacific, 217–34. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6964-7_12.
Full textAbstract:
Abstract Although Japan’s current carbon tax rate is much lower than the rates applied in European countries, the Japanese government may increase the tax rate in the near future, in order to strengthen measures to combat global warming. Since a country’s carbon-pricing policy does not distort its economy, it is considered to be an efficient policy measure. However, the burden of carbon pricing varies across regions and across households. Since low-income households generally allocate a larger proportion of their disposable income to energy costs than high-income households, the burden of carbon taxes on low-income households tends to be higher than for high-income households. In addition, households in cold regions spend more money for space heating, and those in rural areas spend more money for gasoline. Unless the government objectively analyzes the impact of carbon pricing and proposes convincing countermeasures to deal with these unequal impacts, the government is unlikely to obtain public support for a carbon tax increase. In this study, we analyze microlevel data from the Japanese National Survey of Family Income and Expenditure (NSFE) collected from 1989 to 2014, and examine how past energy price changes affected the welfare of different types of households. We then propose countermeasures to address the problems arising from the regressive nature of taxing energy use.
6
Chen, Kaixiao, Xiuyun Guo, Xiaogang Wang, Yun Li, and Long Zhu. "Research Progress on Fish Barrier Measures." In Lecture Notes in Civil Engineering, 1195–208. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_105.
Full textAbstract:
AbstractFishway is an artificial flume for fish migration through sluice gates or dams, which is widely used worldwide as an effective means to restore ecological connectivity of rivers. However, since the inlet of fishway is quite narrow compared to the width of the river, it is difficult for fish to find the inlet of fishway, and fish are easily attracted by the relatively high speed of water flow generated by turbines and cross the dam from turbines, resulting in a large number of fish casualties, so fish barrier measures play an important role in preventing fish from entering turbines, intakes and guiding fish into fishway inlets. This paper collects the main representative types of physical barrier and behavioral barrier, summarizes their advantages, disadvantages and application conditions, and analyzes their applications. It is found that most of the existing fish barrier measures are applicable to the downstream passage, while the upstream passage mainly attracts fish by setting up water auxiliary water systems at the inlet, and a few electric fence and acoustic system are also applied at present; in the near future, the hybrid fish barrier measures with physical barriers as the main body and behavioral barriers as the auxiliary will be the mainstream because of the more stable performance of physical barriers; behavioral barrier have the advantages of saving space, not affected by debris in water, and not causing head loss, but they are still in the experimental stage due to the unstable effect of fish interception, easy to be affected by water body or other external conditions, and high technical requirements. The efficient and stable behavioral barriers have certain research prospects.
7
Altın, Fatma Gül. "A Study on the Municipal Waste Management Practices of European Union Countries." In Practice, Progress, and Proficiency in Sustainability, 1–20. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-4829-8.ch001.
Full textAbstract:
Industrialization, increasingly crowded cities, and the change in consumption habits have caused municipal waste to be an important part of sustainable development. In this study, the practices of EU countries regarding municipal waste management were evaluated using clustering and data envelopment analysis (DEA). The data set for 2019 was collected from Eurostat and eight variables were identified for the analyses. In the first stage, 28 EU countries were divided into four groups using eight variables and EM algorithm. In the second stage, the efficiency scores of the 28 EU countries' recovery and recycling practices were calculated using DEA. A single input and three outputs were determined for the DEA, and the overall, technical, and scale efficiency values were determined using the output-oriented DEA models. The findings show that countries that are efficient in terms of recovery and recycling practices are in the first and second clusters.
8
Kiourtis, Athanasios, Panagiotis Karamolegkos, Andreas Karabetian, Konstantinos Voulgaris, Yannis Poulakis, Argyro Mavrogiorgou, and Dimosthenis Kyriazis. "An Autoscaling Platform Supporting Graph Data Modelling Big Data Analytics." In Studies in Health Technology and Informatics. IOS Press, 2022. http://dx.doi.org/10.3233/shti220743.
Full textAbstract:
Big Data has proved to be vast and complex, without being efficiently manageable through traditional architectures, whereas data analysis is considered crucial for both technical and non-technical stakeholders. Current analytics platforms are siloed for specific domains, whereas the requirements to enhance their use and lower their technicalities are continuously increasing. This paper describes a domain-agnostic single access autoscaling Big Data analytics platform, namely Diastema, as a collection of efficient and scalable components, offering user-friendly analytics through graph data modelling, supporting technical and non-technical stakeholders. Diastema’s applicability is evaluated in healthcare through a predicting classifier for a COVID19 dataset, considering real-world constraints.
9
Bychkova, Elena F. "Webinars for ecological education and advancement of sustainable development concepts in libraries." In Research in Llibrary theory and practice: Annual interdepartmental collection of scientific papers, 10–18. Russian National Public Library for Science and Technology, 2022. http://dx.doi.org/10.33186/978-5-85638-241-8-2022-10-18.
Full textAbstract:
For efficient ecological education and advancement of sustainable development goals (STGs), the librarians need special knowledge in ecology and professional competencies of searching thematic information, organizing educational activities, and systematic information exchange. These goals are efficiently achieved through thematic webinars for librarians in ecological education organized by Russian National Public Library for Science and Technology. The RNPLS&T hosts the webinars since 2012, and since 2017, does it regularly and systematically. The author examines the role of the webinars in advancing this library activity vector.
10
Manolopoulos, Yannis, Mikolaj Morzy, Tadeusz Morzy, Alexandros Nanopoulos, Marek Wojciechowski, and Maciej Zakrzewicz. "Indexing Techniques for Web Access Logs." In Web Information Systems, 305–34. IGI Global, 2004. http://dx.doi.org/10.4018/978-1-59140-208-4.ch009.
Full textAbstract:
Access histories of users visiting a web server are automatically recorded in web access logs. Conceptually, the web-log data can be regarded as a collection of clients’ access-sequences, where each sequence is a list of pages accessed by a single user in a single session. This chapter presents novel indexing techniques that support efficient processing of so-called pattern queries, which consist of finding all access sequences that contain a given subsequence. Pattern queries are a key element of advanced analyses of web-log data, especially those concerning typical navigation schemes. In this chapter, we discuss the particularities of efficiently processing user access-sequences with pattern queries, compared to the case of searching unordered sets. Extensive experimental results are given, which examine a variety of factors and illustrate the superiority of the proposed methods over indexing techniques for unordered data adapted to access sequences.
Conference papers on the topic "Single collector efficiency"
1
Ibrahim, Zamry, Zahari Ibarahim, Baharudin Yatim, and Mohd Hafidz Ruslan. "Thermal efficiency of single-pass solar air collector." In THE 2013 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2013 Postgraduate Colloquium. AIP Publishing LLC, 2013. http://dx.doi.org/10.1063/1.4858635.
Full text
2
Ibrahim, Zamry, Zahari Ibarahim, Baharudin Yatim, and Mohd Hafidz Ruslan. "Experimental studies on the thermal efficiency of the single-pass solar air collector with fins." In 2012 NATIONAL PHYSICS CONFERENCE: (PERFIK 2012). AIP, 2013. http://dx.doi.org/10.1063/1.4803580.
Full text
3
Chow, T. T., J. Ji, and W. He. "Photovoltaic-Thermal Collector System for Domestic Application." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76128.
Full textAbstract:
Photovoltaic-thermal (PV/T) systems integrate photovoltaic and solar thermal technologies into one single system with dual production of electricity and heat energy. A typical arrangement is the direct attachment of PV modules on to a solar thermal collector surface. For a given collector surface area, the overall system energy performance is expected higher than the conventional “side-by-side” PV and solar thermal systems. In the development of PV/T collector technology using water as the coolant, the most common design follows the sheet-and-tube thermal absorber concept. Fin performance of the thermal absorber has been identified as one important factor that affects much the overall energy performance of the collector. Accordingly, an aluminum-alloy flat-box type PV/T collector prototype was constructed and tested. Our test results indicate that a high combined thermal and electrical efficiency can be achieved. The primary-energy-saving efficiency for daily exposure approaches 65% at zero reduced temperature operation. With a simple and handy design, the product is considered to be very suitable for domestic application.
4
Gupta, Akhilesh, Ravi Kumar, and Bharat Ramani. "Performance and Economic Analysis of Double Pass Solar Air Collector." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54707.
Full textAbstract:
Solar collector is a type of heat exchanger which transfers solar radiation energy into the heat energy. Conventional solar air collectors have poor thermal efficiency primarily due to high heat losses and low convective heat transfer coefficient between the absorber plate and flowing air stream, leading to higher absorber plate temperature and greater thermal losses. Attempts have been made to improve the thermal performance of conventional solar air collectors by employing various design and flow arrangements. Double pass counter flow solar air collector with porous material in the second air passage is one of the important and effective design improvement that has been proposed to improve the thermal performance. This paper presents the performance and economic analysis of double pass solar air collector with and without porous material. Effects of various parameters on the thermal performance and pressure drop characteristics have been studied experimentally. The study concludes that double pass arrangement with porous material is economical and having short payback period. Also, the thermal performance of double pass solar air collector with porous material is significantly higher compared to double pass solar air collector without porous material and single pass arrangement.
5
Nokhosteen, Arman, and Sarvenaz Sobhansarbandi. "Thermal Performance Evaluation of a Solar Collector Utilizing a Novel Resistance Network Model." In ASME 2020 Power Conference collocated with the 2020 International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/power2020-16579.
Full textAbstract:
Abstract Heat pipe evacuated tube solar collectors (HPETCs) are a type of solar collectors with appealing characteristics for the application in solar water heating (SWH) technologies. In order to better understand the heat transfer phenomena in HPETCs and improve their efficiency, there is a need for a fast and robust numerical tool. Due to the complexity of the heat transfer processes involved in modeling a collector’s performance, direct numerical analysis solutions (DNS) are computationally cumbersome. Recent studies have shown that resistance network (RN) models are suitable tools for studying the performance and thermal behavior of HPETCs. In this work, a novel method of resistance network based proper orthogonal decomposition (RNPOD) is presented which can not only consider the geographical and meteorological characteristics of the ambient surroundings, but also take into account the peripheral temperature distribution of a single HPETC. Once the temperatures at each instance in time have been calculated, a POD method is used to predict the thermal behavior of the collector with desired temporal accuracy. The obtained results of this study are cross-validated with the previous experimental work of the authors, illustrating that the model is able to predict the peripheral temperature distribution with a maximum error of 10%.
6
Gonzalez, Catalina, and Jinny Rhee. "Numerical Optimization of a Cogenerating Parabolic Solar Collector Receiver." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67915.
Full textAbstract:
The motivation for this study comes from the need for a clean, renewable energy source, which is greater now more than ever to reduce the country’s dependence on fossil fuels. Cogenerating solar systems can provide heat and electricity for many industrial applications such as power generation and absorption refrigeration systems. For example, data centers that run on conventional refrigeration systems are one of the largest electricity consumers in the nation, accounting for 1.2% of the total electricity consumption in 2005. This electricity consumption, almost half of which is used to run the data center’s air conditioning units, translates to $2.7 billion in electricity costs for that year. Using cogenerating solar systems for these types of applications could represent a significant amount of savings in electricity costs. The objective of this paper is to numerically optimize a receiver for a cogenerating photovoltaic and thermal parabolic solar collector that will produce both heat and electricity. The solar cogeneration system studied will convert solar energy into both heat and electricity by using a combination of photovoltaic cells, a parabolic trough thermal collector, and water as the liquid heat exchanger on the photovoltaic cells. The peak electrical efficiency of the multi-junction gallium arsenide Spectrolab photovoltaic cells used in this study is about 32%, with the rest of the solar energy being absorbed as heat. These temperature gains in the cells can lead to a decrease in efficiency. However, in cogenerating systems, water is used as a working fluid to remove heat from the photovoltaic cells, thus aiding in increasing the electrical efficiency of the photovoltaic system as well as increasing the thermal energy gained from the solar thermal collector. The numerical analysis for this project will use Flotherm, a CFD tool used to solve fluid and thermal problems. A single-phase water cooled square duct receiver subjected to non-uniform heating will be analyzed in Flotherm to determine the optimal parameters for the best convection heat transfer between the working fluid and the photovoltaic cells. To enhance the heat transfer between photovoltaic cells and working fluid, the inner surface of the receiver tube receiving the heat flux will be improved by adding fins to increase heat transfer and induce turbulent flow. The initial receiver design will be compared with other receivers to determine the optimal design. Results will be presented parametrically for a range of flow rates and receiver geometry.
7
Rhushi Prasad, P., P. B. Gangavati, H. V. Byregowda, and K. S. Badarinarayan. "Experimental Analysis of a Tracking Solar Water Heating System by Real Time Digital Tracking Method." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62030.
Full textAbstract:
Nowadays the field of applied mechanical systems opens new horizons for the use of orientation mechanisms. The opportunity to use mechanisms with a “sustainable purpose” leads to new approaches in the development of renewable energy systems design. In literature review many authors says the evaluation of the existing products shows that the tracking mechanisms for solar energy conversion systems may improve the efficiency of the solar energy conversion systems up to 30% to 50%. Applications of solar energy for domestic and industrial heating purposes are becoming very popular. However the effectiveness of presently used fixed flat plate collectors, photovoltaic panels and parabolic collector are low due to the moving nature of the energy source. This paper presents researches in the field of increasing the efficiency of the solar energy conversion by using tracking systems with flat plate collector of solar water heating system with the aim to change the position of the solar collector/solar panels correlated to the sun position for maximizing the use of beam radiation by real time digital tracking method. H.V. Byregowda et.al. optimized the interaction between the mechatronic system components by integrating the analog electronic system by using a 555 timer in the mechanical model by designing a single axis low cost tracking system of experimental model in order to reduce cost and show improvement in efficiency of tracking systems before beginning with the virtual prototype level. The work done by these authors was at chickballapur location in BGS R&D centre, SJCIT College. The result Obtained in their research work is that, the thermal efficiency was increased by 21% with tracking of manual method and by 24% with analog method of automatic tracking system. In the present work, a new method of tracking system has been developed electronically with solar water heating systems used in homes for water heating and Power utilization as multiple purpose domestic applications by adding real time clock (RTC) digital, microcontroller, DC motor, Electronics circuit board, batteries and photovoltaic panels along with water tank, flat plate collector which are existing at present in homes only for water heating applications. The results obtained in present work of digital tracking system the thermal efficiency of experimental working model of flat plate collector shows 30% increase when compared with tracking system and non tracking system.
8
Sánchez, Carola, José Macías, Jonathan León, Geancarlos Zamora, and Guillermo Soriano. "Design, Implementation, and Evaluation of Thermal Performance of a Thermosiphon Flat-Plate Solar Collector for Water Heating in Ecuadorian Coastal Region." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71944.
Full textAbstract:
Passive solar water heating (SWH) is a convenient method to meet domestic hot water requirements in rural areas, where electricity may not be available or fuel supply might be limited due to difficult access. In this work, a low-cost thermosiphon flat-plate solar collector alternative is presented. The design was purposely limited to materials and recyclable products widely available in the local market, such as Tetra Pak, plastic bottles, and polypropylene (PP) fittings and pipes. Since PP is a thermoplastic polymer, a poor heat conductor, it was necessary to ensure a suitable system isolation to obtain an optimum thermal performance, comparable to commercial solar collectors. The design was built and tested in Guayaquil, Ecuadorian coastal city. Six inexpensive temperature sensors were placed at the entrance and exit of the collector, on the flat-plate and inside the hot water storage tank. Data was recorded using an Arduino single-board computer and later analyzed with the data gathered via weather station. The implementation costs of the system are approximately US$300, the overall performance during January 2017 fluctuated between 54% and 23%, and the storage tank temperature range varied from to 46°C to 33°C. Due to its reliability and affordable cost, the SWH system is an attractive alternative to an Ecuadorian commercial solar flat plate collector, which price is set between US$600 and US$700, it has an efficiency around 60%, and the average annual storage tank temperature is 62°C.
9
Musa, Elradi A., K. Sopian, and Shahrir Abdullah. "Transient Analysis for a Double-Pass Solar Collector With and Without Porous Media." In ASME Solar 2002: International Solar Energy Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/sed2002-1043.
Full textAbstract:
The double-pass solar collector with porous media in the lower channel provides a higher outlet temperature compared to the conventional single-pass collector. Therefore, the thermal efficiency of the solar collector is increasing. The solar collector can be used for a wide variety of applications such as solar industrial process heat and solar drying of agricultural produce. A theoretical model has been developed for the double-pass solar collector. An experimental setup has been designed and constructed. Comparisons of the theoretical and the experimental results have been conducted. Such comparisons include the outlet temperatures and thermal efficiencies of the solar collector for various design and operating conditions. Close agreement has been obtained between the theoretical and experimental results. In addition, heat transfer and pressure drop relationships have been developed for air following through the porous media. The porous media has been arranged with difference porosities to increase heat transfer, area density and the total heat transfer rate. The heat transfer coefficient and friction factors are strong function of porosity.
10
Lee, Hoe-Gil. "Multilevel Optimal Design of a Solar PV Array System Using Game Theory Approach." In ASME 2019 Power Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/power2019-1840.
Full textAbstract:
Abstract This study proposes a method, grounded in a multilevel decision-making approach, for a stationary fixed-plate photovoltaic (PV) collector system. The system is comprised of three different subsystems: cell, panel, and array. We consider photovoltaic effects for output performance and an inverter system for distribution from the PV collector, including multiple conflicting objectives in individual subsystems in terms of cell conversion efficiency, power output, incident solar energy, seasonal characteristics, and costs. In terms of the performance in individual subsystems, the problem is reformulated into several smaller subproblems at each subsystem, and a coordination problem at the system level is compromised for optimization purposes. Multilevel optimization for the stationary fixed-plate PV collector system is achieved through the results of single-objective optimization that uses Genetic Algorithm programming (GA) to find global optimum solutions with decision-making under modified game theory. Thus, this work contributes to the optimal design of a stationary fixed-plate PV collector system for the best compromise solution based on specified requirements.
Reports on the topic "Single collector efficiency"
1
Brodie, Katherine, Brittany Bruder, Richard Slocum, and Nicholas Spore. Simultaneous mapping of coastal topography and bathymetry from a lightweight multicamera UAS. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41440.
Full textAbstract:
A low-cost multicamera Unmanned Aircraft System (UAS) is used to simultaneously estimate open-coast topography and bathymetry from a single longitudinal coastal flight. The UAS combines nadir and oblique imagery to create a wide field of view (FOV), which enables collection of mobile, long dwell timeseries of the littoral zone suitable for structure-from motion (SfM), and wave speed inversion algorithms. Resultant digital surface models (DSMs) compare well with terrestrial topographic lidar and bathymetric survey data at Duck, NC, USA, with root-mean-square error (RMSE)/bias of 0.26/–0.05 and 0.34/–0.05 m, respectively. Bathymetric data from another flight at Virginia Beach, VA, USA, demonstrates successful comparison (RMSE/bias of 0.17/0.06 m) in a secondary environment. UAS-derived engineering data products, total volume profiles and shoreline position, were congruent with those calculated from traditional topo-bathymetric surveys at Duck. Capturing both topography and bathymetry within a single flight, the presented multicamera system is more efficient than data acquisition with a single camera UAS; this advantage grows for longer stretches of coastline (10 km). Efficiency increases further with an on-board Global Navigation Satellite System–Inertial Navigation System (GNSS-INS) to eliminate ground control point (GCP) placement. The Appendix reprocesses the Virginia Beach flight with the GNSS–INS input and no GCPs.
2
Knight, R. D., and B. A. Kjarsgaard. Comparative pXRF and Lab ICP-ES/MS methods for mineral resource assessment, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331239.
Full textAbstract:
The Geological Survey of Canada undertook a mineral resource assessment for a proposed national park in northern Canada (~ 33,500 km2) spanning the transition from boreal forest to barren lands tundra. Bedrock geology of this region is complex and includes the Archean Slave Craton, the Archean and Paleoproterozoic Rae domain of the Churchill Province, the Paleoproterozoic Thelon and Taltson magmatic-tectonic zones, and the Paleoproterozoic East Arm sedimentary basin. The area has variable mineral potential for lode gold, kimberlite-hosted diamonds, VMS, vein uranium and copper, SEDEX, as well as other deposit types. A comparison of analytical methods was carried out after processing the field collected samples to acquire both the < 2 mm and for the < 0.063 mm size fractions for 241 surficial sediment (till) samples, collected using a 10 x 10 km grid. Analytical methods comprised: 1) aqua regia followed by ICP-MS analysis, 2) 4-acid hot dissolution followed by ICP-ES/MS analysis, 3) lithium metaborate/tetraborate fusion methods followed by ICP-ES for major elements and ICP-MS for trace elements and, 4) portable XRF on dried, non-sieved sediment samples subjected to a granular segregation processing technique (to produce a clay-silt proxy) for seventeen elements (Ba, Ca, Cr, Cu, Fe, K, Mn, Ni, Pb, Rb, Sr, Th, Ti, U, V, Zn, and Zr) Results indicate that pXRF data do not replicate exactly the laboratory 4-acid and fusion data (in terms of precision and accuracy), but the relationship between the datasets is systematic as displayed in x-y scattergrams. Interpolated single element plots indicate that till samples with anomalies of high and low pXRF concentration levels are synonymous with high and low laboratory-based analytical concentration levels, respectively. The pXRF interpolations thus illustrate the regional geochemical trends, and most importantly, the significant geochemical anomalies in the surficial samples. These results indicate that pXRF spectrometry for a subset of elements is comparable to traditional laboratory methods. pXRF spectrometry also provides the benefit of rapid analysis and data acquisition that has a direct influence on real time sampling designs. This information facilitates efficient and cost-effective field projects (i.e. where used to identify regions of interest for high density sampling), and to prioritize samples to be analyzed using traditional geochemical methods. These tactics should increase the efficiency and success of a mineral exploration and/or environmental sampling programs.
3
Bao, Jieyi, Xiaoqiang Hu, Cheng Peng, Yi Jiang, Shuo Li, and Tommy Nantung. Truck Traffic and Load Spectra of Indiana Roadways for the Mechanistic-Empirical Pavement Design Guide. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317227.
Full textAbstract:
The Mechanistic-Empirical Pavement Design Guide (MEPDG) has been employed for pavement design by the Indiana Department of Transportation (INDOT) since 2009 and has generated efficient pavement designs with a lower cost. It has been demonstrated that the success of MEPDG implementation depends largely on a high level of accuracy associated with the information supplied as design inputs. Vehicular traffic loading is one of the key factors that may cause not only pavement structural failures, such as fatigue cracking and rutting, but also functional surface distresses, including friction and smoothness. In particular, truck load spectra play a critical role in all aspects of the pavement structure design. Inaccurate traffic information will yield an incorrect estimate of pavement thickness, which can either make the pavement fail prematurely in the case of under-designed thickness or increase construction cost in the case of over-designed thickness. The primary objective of this study was to update the traffic design input module, and thus to improve the current INDOT pavement design procedures. Efforts were made to reclassify truck traffic categories to accurately account for the specific axle load spectra on two-lane roads with low truck traffic and interstate routes with very high truck traffic. The traffic input module was updated with the most recent data to better reflect the axle load spectra for pavement design. Vehicle platoons were analyzed to better understand the truck traffic characteristics. The unclassified vehicles by traffic recording devices were examined and analyzed to identify possible causes of the inaccurate data collection. Bus traffic in the Indiana urban areas was investigated to provide additional information for highway engineers with respect to city streets as well as highway sections passing through urban areas. New equivalent single axle load (ESAL) values were determined based on the updated traffic data. In addition, a truck traffic data repository and visualization model and a TABLEAU interactive visualization dashboard model were developed for easy access, view, storage, and analysis of MEPDG related traffic data.
4
Breiman, Adina, Jan Dvorak, Abraham Korol, and Eduard Akhunov. Population Genomics and Association Mapping of Disease Resistance Genes in Israeli Populations of Wild Relatives of Wheat, Triticum dicoccoides and Aegilops speltoides. United States Department of Agriculture, December 2011. http://dx.doi.org/10.32747/2011.7697121.bard.
Full textAbstract:
Wheat is the most widely grown crop on earth, together with rice it is second to maize in total global tonnage. One of the emerging threats to wheat is stripe (yellow) rust, especially in North Africa, West and Central Asia and North America. The most efficient way to control plant diseases is to introduce disease resistant genes. However, the pathogens can overcome rapidly the effectiveness of these genes when they are wildly used. Therefore, there is a constant need to find new resistance genes to replace the non-effective genes. The resistance gene pool in the cultivated wheat is depleted and there is a need to find new genes in the wild relative of wheat. Wild emmer (Triticum dicoccoides) the progenitor of the cultivated wheat can serve as valuable gene pool for breeding for disease resistance. Transferring of novel genes into elite cultivars is highly facilitated by the availability of information of their chromosomal location. Therefore, our goals in this study was to find stripe rust resistant and susceptible genotypes in Israeli T. dicoccoides population, genotype them using state of the art genotyping methods and to find association between genetic markers and stripe rust resistance. We have screened 129 accessions from our collection of wild emmer wheat for resistance to three isolates of stripe rust. About 30% of the accessions were resistant to one or more isolates, 50% susceptible, and the rest displayed intermediate response. The accessions were genotyped with Illumina'sInfinium assay which consists of 9K single nucleotide polymorphism (SNP) markers. About 13% (1179) of the SNPs were polymorphic in the wild emmer population. Cluster analysis based on SNP diversity has shown that there are two main groups in the wild population. A big cluster probably belongs to the Horanum ssp. and a small cluster of the Judaicum ssp. In order to avoid population structure bias, the Judaicum spp. was removed from the association analysis. In the remaining group of genotypes, linkage disequilibrium (LD) measured along the chromosomes decayed rapidly within one centimorgan. This is the first time when such analysis is conducted on a genome wide level in wild emmer. Such a rapid decay in LD level, quite unexpected for a selfer, was not observed in cultivated wheat collection. It indicates that wild emmer populations are highly suitable for association studies yielding a better resolution than association studies in cultivated wheat or genetic mapping in bi-parental populations. Significant association was found between an SNP marker located in the distal region of chromosome arm 1BL and resistance to one of the isolates. This region is not known in the literature to bear a stripe rust resistance gene. Therefore, there may be a new stripe rust resistance gene in this locus. With the current fast increase of wheat genome sequence data, genome wide association analysis becomes a feasible task and efficient strategy for searching novel genes in wild emmer wheat. In this study, we have shown that the wild emmer gene pool is a valuable source for new stripe rust resistance genes that can protect the cultivated wheat.
5
Rudd, Ian. Leveraging Artificial Intelligence and Robotics to Improve Mental Health. Intellectual Archive, July 2022. http://dx.doi.org/10.32370/iaj.2710.
Full textAbstract:
Artificial Intelligence (AI) is one of the oldest fields of computer science used in building structures that look like human beings in terms of thinking, learning, solving problems, and decision making (Jovanovic et al., 2021). AI technologies and techniques have been in application in various aspects to aid in solving problems and performing tasks more reliably, efficiently, and effectively than what would happen without their use. These technologies have also been reshaping the health sector's field, particularly digital tools and medical robotics (Dantas & Nogaroli, 2021). The new reality has been feasible since there has been exponential growth in the patient health data collected globally. The different technological approaches are revolutionizing medical sciences into dataintensive sciences (Dantas & Nogaroli, 2021). Notably, with digitizing medical records supported the increasing cloud storage, the health sector created a vast and potentially immeasurable volume of biomedical data necessary for implementing robotics and AI. Despite the notable use of AI in healthcare sectors such as dermatology and radiology, its use in psychological healthcare has neem models. Considering the increased mortality and morbidity levels among patients with psychiatric illnesses and the debilitating shortage of psychological healthcare workers, there is a vital requirement for AI and robotics to help in identifying high-risk persons and providing measures that avert and treat mental disorders (Lee et al., 2021). This discussion is focused on understanding how AI and robotics could be employed in improving mental health in the human community. The continued success of this technology in other healthcare fields demonstrates that it could also be used in redefining mental sicknesses objectively, identifying them at a prodromal phase, personalizing the treatments, and empowering patients in their care programs.
6
Paynter, Robin A., Celia Fiordalisi, Elizabeth Stoeger, Eileen Erinoff, Robin Featherstone, Christiane Voisin, and Gaelen P. Adam. A Prospective Comparison of Evidence Synthesis Search Strategies Developed With and Without Text-Mining Tools. Agency for Healthcare Research and Quality (AHRQ), March 2021. http://dx.doi.org/10.23970/ahrqepcmethodsprospectivecomparison.
Full textAbstract:
Background: In an era of explosive growth in biomedical evidence, improving systematic review (SR) search processes is increasingly critical. Text-mining tools (TMTs) are a potentially powerful resource to improve and streamline search strategy development. Two types of TMTs are especially of interest to searchers: word frequency (useful for identifying most used keyword terms, e.g., PubReminer) and clustering (visualizing common themes, e.g., Carrot2). Objectives: The objectives of this study were to compare the benefits and trade-offs of searches with and without the use of TMTs for evidence synthesis products in real world settings. Specific questions included: (1) Do TMTs decrease the time spent developing search strategies? (2) How do TMTs affect the sensitivity and yield of searches? (3) Do TMTs identify groups of records that can be safely excluded in the search evaluation step? (4) Does the complexity of a systematic review topic affect TMT performance? In addition to quantitative data, we collected librarians' comments on their experiences using TMTs to explore when and how these new tools may be useful in systematic review search¬¬ creation. Methods: In this prospective comparative study, we included seven SR projects, and classified them into simple or complex topics. The project librarian used conventional “usual practice” (UP) methods to create the MEDLINE search strategy, while a paired TMT librarian simultaneously and independently created a search strategy using a variety of TMTs. TMT librarians could choose one or more freely available TMTs per category from a pre-selected list in each of three categories: (1) keyword/phrase tools: AntConc, PubReMiner; (2) subject term tools: MeSH on Demand, PubReMiner, Yale MeSH Analyzer; and (3) strategy evaluation tools: Carrot2, VOSviewer. We collected results from both MEDLINE searches (with and without TMTs), coded every citation’s origin (UP or TMT respectively), deduplicated them, and then sent the citation library to the review team for screening. When the draft report was submitted, we used the final list of included citations to calculate the sensitivity, precision, and number-needed-to-read for each search (with and without TMTs). Separately, we tracked the time spent on various aspects of search creation by each librarian. Simple and complex topics were analyzed separately to provide insight into whether TMTs could be more useful for one type of topic or another. Results: Across all reviews, UP searches seemed to perform better than TMT, but because of the small sample size, none of these differences was statistically significant. UP searches were slightly more sensitive (92% [95% confidence intervals (CI) 85–99%]) than TMT searches (84.9% [95% CI 74.4–95.4%]). The mean number-needed-to-read was 83 (SD 34) for UP and 90 (SD 68) for TMT. Keyword and subject term development using TMTs generally took less time than those developed using UP alone. The average total time was 12 hours (SD 8) to create a complete search strategy by UP librarians, and 5 hours (SD 2) for the TMT librarians. TMTs neither affected search evaluation time nor improved identification of exclusion concepts (irrelevant records) that can be safely removed from the search set. Conclusion: Across all reviews but one, TMT searches were less sensitive than UP searches. For simple SR topics (i.e., single indication–single drug), TMT searches were slightly less sensitive, but reduced time spent in search design. For complex SR topics (e.g., multicomponent interventions), TMT searches were less sensitive than UP searches; nevertheless, in complex reviews, they identified unique eligible citations not found by the UP searches. TMT searches also reduced time spent in search strategy development. For all evidence synthesis types, TMT searches may be more efficient in reviews where comprehensiveness is not paramount, or as an adjunct to UP for evidence syntheses, because they can identify unique includable citations. If TMTs were easier to learn and use, their utility would be increased.
7
Tel-Zur, Neomi, and Jeffrey J. Doyle. Role of Polyploidy in Vine Cacti Speciation and Crop Domestication. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7697110.bard.
Full textAbstract:
1. Abstract: Over the past 25 years, vine cacti of the genera Hylocereus and Selenicereus have been introduced into Israel and southern California as new exotic fruit crops. The importance of these crops lies in their high water use efficiency and horticultural potential as exotic fruit crops. Our collaboration focused on the cytological, molecular and evolutionary aspects of vine cacti polyploidization to confront the agricultural challenge of genetic improvement, ultimately to improve success of vine cacti as commercial fruit crop plants. More specifically, we worked on the: 1- Identification of the putative ancestor(s) of the tetraploid H. megalanthus; 2- Determination of the number of origins of H. megalanthus (single vs. multiple origins of polyploidy); 3- Cytogenetic analysis of BC1 and F1 hybrids; 4- Determination of important agricultural traits and the selection of superior hybrids for cultivation. The plant material used in this study comprised interspecific Hylocereus F1 and first backcross (BC1) hybrids, nine Hylocereus species (58 genotypes), nine Selenicereus species (14 genotypes), and four Epiphyllum genotypes. Two BC1 hexaploids (BC-023 and BC-031) were obtained, a high ploidy level that can be explained only by a fertilization event between one unreduced female gamete from the triploid hybrid and a balanced gamete from the pollen donor, the diploid H. monacanthus. These findings are scientific evidence that support the possibility that “hybridization followed by chromosome doubling” could also occur in nature. Cytomixis, the migration of chromatin between adjacent cells through connecting cytoplasmatic channels, was observed in vine cacti hybrids and may thus imply selective DNA elimination in response to the allopolyploidization process. Evidence from plastid and nrDNA internal transcribed spacers (ITS) sequences support the placement of H. megalanthus within a monophyletic Hylocereus group. Furthermore, both plastid and ITS datasets are most consistent with a conclusion that this tetraploid species is an autopolyploid, despite observations that the species appears to be morphologically intermediate between Hylocereus and Selenicereus. Although the possibility of very narrow allopolyploidly (i.e., derivation from parents that are barely diverged from each other such as closely related species in the same genus) cannot be ruled out entirely based on our data (in part due to the unavailability of Hylocereus species considered to be morphologically the closest relatives of H. megalanthus), the possibility of H. megalanthus representing an intergeneric cross (i.e., Hylocereus × Selenicereus) seems extremely unlikely. Interestingly, the process of homogenization of ITS sequences (concerted evolution) is either incomplete or lacking in both Hylocereus and Selenicereus, and the inclusion of several artificial hybrids in the molecular study revealed the potential for biparental plastid inheritance in Hylocereus. The most important agricultural implication of this research project was the information collected for F1 and BC1 hybrids. Specifically, this project concluded with the selection of four superior hybrids in terms of fruit quality and potential yields under extreme high temperatures. These selected hybrids are self-compatible, avoiding the need for hand cross pollination to set fruits, thus reducing manpower costs. We recently offered these hybrids to growers in Israel for prioritized rapid evaluation and characterization.