Bibliografias temáticas / TVAA

Literatura científica selecionada sobre o tema "TVAA"

Autor: Grafiati
Publicado: 26 de julho de 2024
Última modificação: 27 de julho de 2024

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Artigos de revistas sobre o assunto "TVAA"

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Pang, Wenbin, Wei Zhou, Yufang Ruan, Linjun Zhang, Hua Shu, Yang Zhang e Yumei Zhang. "Visual Deprivation Alters Functional Connectivity of Neural Networks for Voice Recognition: A Resting-State fMRI Study". Brain Sciences 13, n.º 4 (7 de abril de 2023): 636. http://dx.doi.org/10.3390/brainsci13040636.

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Humans recognize one another by identifying their voices and faces. For sighted people, the integration of voice and face signals in corresponding brain networks plays an important role in facilitating the process. However, individuals with vision loss primarily resort to voice cues to recognize a person’s identity. It remains unclear how the neural systems for voice recognition reorganize in the blind. In the present study, we collected behavioral and resting-state fMRI data from 20 early blind (5 females; mean age = 22.6 years) and 22 sighted control (7 females; mean age = 23.7 years) individuals. We aimed to investigate the alterations in the resting-state functional connectivity (FC) among the voice- and face-sensitive areas in blind subjects in comparison with controls. We found that the intranetwork connections among voice-sensitive areas, including amygdala-posterior “temporal voice areas” (TVAp), amygdala-anterior “temporal voice areas” (TVAa), and amygdala-inferior frontal gyrus (IFG) were enhanced in the early blind. The blind group also showed increased FCs of “fusiform face area” (FFA)-IFG and “occipital face area” (OFA)-IFG but decreased FCs between the face-sensitive areas (i.e., FFA and OFA) and TVAa. Moreover, the voice-recognition accuracy was positively related to the strength of TVAp-FFA in the sighted, and the strength of amygdala-FFA in the blind. These findings indicate that visual deprivation shapes functional connectivity by increasing the intranetwork connections among voice-sensitive areas while decreasing the internetwork connections between the voice- and face-sensitive areas. Moreover, the face-sensitive areas are still involved in the voice-recognition process in blind individuals through pathways such as the subcortical-occipital or occipitofrontal connections, which may benefit the visually impaired greatly during voice processing.
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Elleder, Daniel, Deborah C. Melder, Katerina Trejbalova, Jan Svoboda e Mark J. Federspiel. "Two Different Molecular Defects in the Tva Receptor Gene Explain the Resistance of Two tvar Lines of Chickens to Infection by Subgroup A Avian Sarcoma and Leukosis Viruses". Journal of Virology 78, n.º 24 (15 de dezembro de 2004): 13489–500. http://dx.doi.org/10.1128/jvi.78.24.13489-13500.2004.

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ABSTRACT The subgroup A to E avian sarcoma and leukosis viruses (ASLVs) are highly related and are thought to have evolved from a common ancestor. These viruses use distinct cell surface proteins as receptors to gain entry into avian cells. Chickens have evolved resistance to infection by the ASLVs. We have identified the mutations responsible for the block to virus entry in chicken lines resistant to infection by subgroup A ASLVs [ASLV(A)]. The tva genetic locus determines the susceptibility of chicken cells to ASLV(A) viruses. In quail, the ASLV(A) susceptibility allele tvas encodes two forms of the Tva receptor; these proteins are translated from alternatively spliced mRNAs. The normal cellular function of the Tva receptor is unknown; however, the extracellular domain contains a 40-amino-acid, cysteine-rich region that is homologous to the ligand binding region of the low-density lipoprotein receptor (LDLR) proteins. The chicken tvas cDNAs had not yet been fully characterized; we cloned the chicken tva cDNAs from two lines of subgroup A-susceptible chickens, line H6 and line 0. Two types of chicken tvas cDNAs were obtained. These cDNAs encode a longer and shorter form of the Tva receptor homologous to the Tva forms in quail. Two different defects were identified in cDNAs cloned from two different ASLV(A)-resistant inbred chickens, line C and line 72. Line C tvar contains a single base pair substitution, resulting in a cysteine-to-tryptophan change in the LDLR-like region of Tva. This mutation drastically reduces the binding affinity of TvaR for the ASLV(A) envelope glycoproteins. Line 72 tvar2 contains a 4-bp insertion in exon 1 that causes a change in the reading frame, which blocks expression of the Tva receptor.
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Koo, Jeong-Hoi, Mehdi Ahmadian e Mehdi Setareh. "Experimental Robustness Analysis of Magneto-Rheological Tuned Vibration Absorbers Subject to Mass Off-Tuning". Journal of Vibration and Acoustics 128, n.º 1 (24 de maio de 2005): 126–31. http://dx.doi.org/10.1115/1.2128647.

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This paper offers an experimental robustness analysis of a semi-active tuned vibration absorber (TVA) subject to structural mass off-tuning, which occurs frequently in practical applications of TVAs. One of the critical problems of a conventional TVA is off-tuning or miss-tuning because off-tuned TVAs may amplify the vibrations of the primary structure. This study intends to evaluate how well semi-active TVAs are able to adapt to structural mass changes (mass off-tuning) as compared with passive TVAs. To this end, a test apparatus was built to represent a two-degree-of-freedom structure model coupled with a TVA. The semi-active TVA considered in this study employed a magneto-rheological (MR) damper as its damping element to enhance overall performance. Using this test apparatus, a series of tests were conducted to identify the optimal tuning parameters of the TVAs. After obtaining each TVA’s optimal tuning parameters based on equal peak transmissibility criteria, the mass off-tuning tests were then performed on the optimally tuned TVAs. In order to off-tune the system, the mass of the primary structure varied from −19% to +19% of its nominal mass using a set of steel plates. Overall, the experimental results show that the semi-active MR TVA outperforms the passive TVA in reducing maximum vibrations. Moreover, the results show that the semi- active TVA is more robust to changes in the primary mass (mass off-tuning) The results further show that the semi-active MR TVA offers larger performance gains as the structure mass increases.
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Elahinia, Mohammad H., Jeong-Hoi Koo e Honghao Tan. "Improving Robustness of Tuned Vibration Absorbers Using Shape Memory Alloys". Shock and Vibration 12, n.º 5 (2005): 349–61. http://dx.doi.org/10.1155/2005/168260.

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A conventional passive tuned vibration absorber (TVA) is effective when it is precisely tuned to the frequency of a vibration mode; otherwise, it may amplify the vibrations of the primary system. In many applications, the frequency often changes over time. For example, adding or subtracting external mass on the existing primary system results in changes in the system’s natural frequency. The frequency changes of the primary system can significantly degrade the performance of TVA. To cope with this problem, many alternative TVAs (such as semiactive, adaptive, and active TVAs) have been studied. As another alternative, this paper investigates the use of Shape Memory Alloys (SMAs) in passive TVAs in order to improve the robustness of the TVAs subject to mass change in the primary system. The proposed SMA-TVA employs SMA wires, which exhibit variable stiffness, as the spring element of the TVA. This allows us to tune effective stiffness of the TVA to adapt to the changes in the primary system's natural frequency. The simulation model, presented in this paper, contains the dynamics of the TVA along with the SMA wire model that includes phase transformation, heat transfer, and the constitutive relations. Additionally, a PID controller is included for regulating the applied voltage to the SMA wires in order to maintain the desired stiffness. The robustness analysis is then performed on both the SMA-TVA and the equivalent passive TVA. For our robustness analysis, the mass of the primary system is varied by ± 30% of its nominal mass. The simulation results show that the SMA-TVA is more robust than the equivalent passive TVA in reducing peak vibrations in the primary system subject to change of its mass.
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Koo, J.-H., e M. Ahmadian. "A qualitative analysis of groundhook tuned vibration absorbers for controlling structural vibrations". Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 216, n.º 4 (1 de dezembro de 2002): 351–59. http://dx.doi.org/10.1243/146441902320992446.

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The primary purpose of this study is to investigate the dynamic characteristics of semi-active groundhook tuned vibration absorbers (TVAs), using closed-form equivalent models of such systems. Closed-form, equivalent models of groundhook TVAs are developed and compared analytically with those for passive TVAs. Additionally, closed-form solutions of groundhook equivalent TVA models are obtained and are used for a parametric study to evaluate the dynamic characteristics of such systems as various parameters change. The numerical results are compared with passive TVAs which have been studied extensively in the past. The results indicate tat groundhook TVAs, with off-state damping levels within a critical value, are capable of lowering the magnitude of resonant peaks without increasing vibration. In contrast, increasing damping in passive TVAs results in a reduction in the amplitude of resonant peaks, at the expense of increased vibrations at the tuned frequency. The results further indicate that increasing the mass ratio between the TVA and the structure increases the effectiveness of groundhook TVAs, in a manner much similar to passive TVAs. However, increasing off-state damping decreases the effectiveness of groundhook TVAs.
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Vahdati, Nader, e Mehdi Ahmadian. "Hybrid Secondary Suspension Systems". Shock and Vibration 16, n.º 5 (2009): 467–80. http://dx.doi.org/10.1155/2009/624170.

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Passive fluid mounts are used in the fixed wing applications as engine mounts. The passive fluid mount is placed in between the engine and the fuselage to reduce the cabin's structure- borne noise and vibration generated by the engine.To investigate the benefits of passive fluid mounts used in conjunction with tuned vibration absorbers (TVA), a simple mathematical model is developed. This mathematical model includes the mathematical model of a passive fluid mount, a TVA, and a spring representing the fuselage structure. The simulation results indicate that when passive fluid mounts are used in conjunction with TVAs, an active suspension system behavior is nearly created.
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You, Kiheum, e Hojong Choi. "Inter-Stage Output Voltage Amplitude Improvement Circuit Integrated with Class-B Transmit Voltage Amplifier for Mobile Ultrasound Machines". Sensors 20, n.º 21 (2 de novembro de 2020): 6244. http://dx.doi.org/10.3390/s20216244.

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Piezoelectric transducers are triggered by the output voltage signal of a transmit voltage amplifier (TVA). In mobile ultrasound instruments, the sensitivity of piezoelectric transducers is a critical parameter under limited power supply from portable batteries. Therefore, the enhancement of the output voltage amplitude of the amplifier under limited power supply could increase the sensitivity of the piezoelectric transducer. Several-stage TVAs are used to increase the voltage amplitude. However, inter-stage design issues between each TVA block may reduce the voltage amplitude and bandwidth because the electronic components of the amplifier are nonlinearly operated at the desired frequency ranges. To compensate for this effect, we propose a novel inter-stage output voltage amplitude improvement (OVAI) circuit integrated with a class-B TVA circuit. We performed fundamental A-mode pulse-echo tests using a 15-MHz immersion-type piezoelectric transducer to verify the design. The echo amplitude and bandwidth when using an inter-stage OVAI circuit integrated with a class-B TVA circuit (696 mVPP and 29.91%, respectively) were higher than those obtained when using only the class-B TVA circuit (576 mVPP and 24.21%, respectively). Therefore, the proposed OVAI circuit could be beneficial for increasing the output amplitude of the class-B TVA circuit for mobile ultrasound machines.
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Koo, Jeong-Hoi, Mehdi Ahmadian, Mehdi Setareh e Thomas Murray. "In Search of Suitable Control Methods for Semi-Active Tuned Vibration Absorbers". Journal of Vibration and Control 10, n.º 2 (fevereiro de 2004): 163–74. http://dx.doi.org/10.1177/1077546304032020.

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The main purpose of this study is to identify a suitable control method for semi-active tuned vibration absorbers (TVAs) in structural vibration applications. Four control policies are considered. The semi-active control schemes include the following: velocity-based, on-off groundhook control (on-off VBG); velocity-based, continuous groundhook control (continuous VBG); displacement-based, on-off groundhook control (on-off DBG); and displacement-based, continuous groundhook control (continuous DBG). A force-excited model that can be representative of many structural systems is adapted as the baseline model for our analysis. Each of the control policies is applied to the baseline model coupled with a TVA. In order to equally evaluate the control policies, the TVA parameters are optimized according to each policy using numerical optimization techniques. The optimal design parameters are obtained based on minimization of peak transmissibility. The performances of each of the optimized cases are then compared along with the equivalent passive model using the peak transmissibility criteria. The results indicate that all of the semi-active peak transmissibilities are lower than those of the passive, implying that the semi-active TVAs are more effective in reducing vibration levels. The results further indicate that on-off DBG performs the best among the considered control polices.
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Chetty, Runjan, Sara Hafezi-Bakhtiari, Stefano Serra, Richard Colling e Lai Mun Wang. "Traditional serrated adenomas (TSAs) admixed with other serrated (so-called precursor) polyps and conventional adenomas: a frequent occurrence". Journal of Clinical Pathology 68, n.º 4 (14 de janeiro de 2015): 270–73. http://dx.doi.org/10.1136/jclinpath-2014-202827.

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BackgroundTraditional serrated adenoma (TSA) is a very characteristic type of serrated polyp that has a predilection for the left colon. Recent molecular advances have shown two molecular phenotypes of TSA: one associated with BRAF mutations and the other with KRAS mutations. The former is associated with hyperplastic polyps (HPs) and sessile serrated adenomas (SSAs), while the latter is associated with more conventional adenomatous dysplasia.AimsThe association of TSAs with so-called precursor lesions (HPs and SSAs) is not well recognised and the purpose of this study was to explore the coexistent presence of HPs, SSAs and adenomatous polyps within a large cohort of TSAs.MethodsIn total 149 TSAs were examined for the presence of HP, SSA and adenomatous polyps.ResultsSeen in 83 men and 65 women ranging in age from 32 to 89 years and 127 were left sided with 22 in the right colon. Seventy-eight of the 149 TSAs showed evidence of another polyp (52.34%): 32 were low-grade tubular/tubulovillous adenomas (TAs/TVAs; 41%), 28 were HPs (36%) and 18 were SSAs (23%). Eleven of the 22 right-sided TSAs were associated with a precursor lesion (1 HP and 7 SSA). In addition, five TSAs showed more than one polyp type: TSA with TA/TVA and HP (3); TSA with TA/TVA and SSA (2). The TAs/TVAs were adjacent to the TSA but occurred as a separate discrete polyp, while HPs and SSAs were intermingled with the TSA and present at the base and surface of the lesion.ConclusionsMore than 50% of TSAs are associated with a precursor lesion or adjacent TA/TVA. Their recognition is important as this may have surveillance and management ramifications.
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Agyeman, Emmanuel Kwadwo Kale, Steven Duret, Denis Flick, Onrawee Laguerre e Jean Moureh. "Computational Modelling of Airflow and Heat Transfer during Cooling of Stacked Tomatoes: Optimal Crate Design". Energies 16, n.º 4 (19 de fevereiro de 2023): 2048. http://dx.doi.org/10.3390/en16042048.

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A 3D computational fluid dynamics (CFD) model was developed to predict the airflow and heat transfer in half of a pallet layer of tomatoes. The numerical and experimental results were compared, and a good agreement was obtained between both results using the root-mean-square error (RMSE) and absolute relative deviation (ARD) values as criteria. The validated CFD model was then used to minimise the product temperature heterogeneity by optimising the airflow rate and the crate design. A downward flow of the air along the central parts of the crates and an upward flow close to the lateral walls of the crates were observed. Three different total ventilated areas (TVAs) were tested to study their influence on the product temperature uniformity and cooling rate. The MTD and ATD decreased from 6.8 to 3.5 °C and from 1.5 to 0.7 °C, respectively, when the TVA was increased from 11 to 15%.
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Teses / dissertações sobre o assunto "TVAA"

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Thielen, Alexander. "Fake News – Två ord, två betydelser : En statsvetenskaplig begreppsstudie på traditionella medieartiklar". Thesis, Karlstads universitet, Institutionen för samhälls- och kulturvetenskap (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68384.

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A form of political disinformation that had a prominent place in journalism during the US presidential election in 2016 was called fake news. There were, however, uncertainties what could be called fake news. The purpose of this study was to explore qualitatively how mainstream media described the word fake news. The data collection approach was inductive. Data were collected primarily by searching the electronic media databases. The qualitative analysis of 212 articles resulted in two overarching themes which outlines how the concept of fake news has been described in meanstream media. The results of the analysis resulted in the two themes: fabricated lie and distorted truth. The main conclusion is that it circulates two different meanings for the concept of fake news. These definitions of fake news have different meanings, areas of action, actors behind och motives.
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Nordstrand, Erik. "Ett tomtebloss i hjärnan : en redogörelse för hur två idéer blev två färdiga musikproduktioner". Thesis, Kungl. Musikhögskolan, Institutionen för musik- och medieproduktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kmh:diva-1394.

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I denna text behandlas tillkomsten av, inspelningen av och efterarbetet av låtarna Dödskyss och Min gud min gud varför har du överdrivit mig. Under en begränsad tidsperiod har jag skrivit och spelat in låtar till mig själv som artist. En betydande stor del av projektets etapper har enbart kommit att genomföras av mig själv, dock med viss vägledning från utomstående. Dessa etapper inkluderar allt från låtskriveri, inspelning, mixning, mastring samt grafisk utformning. Jag vill för min egen del se projektet både som en konstnärlig, teknisk, karriärs- och ledarskapsmässig utveckling. Arbetssättet bygger på att jag delar upp projektet i flera små bitar. I stället för att göra ett fullängdsalbum har jag skrivit och färdigställt en låt i taget. Projektet präglas både av kort- och långsiktiga perspektiv som jag hoppas kommer fungera för mig både konstnärligt och karriärsmässigt.

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Söderling, Trygve. "Drag på parnassen två sextiotalsstudier /". Helsingfors : Helsingfors Universitet, 2008. http://urn.fi/URN:ISBN:978-952-10-4905-7.

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Blåsjö, Mona. "Studenters skrivande i två kunskapsbyggande miljöer /". Stockholm : Almqvist & Wiksell International, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-265.

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Bergström, Carolina. "Miljöeffektsbedömning av två processlösningar för dricksvattenproduktion". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278837.

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Norrvattens vattenverk Görvälnverket är beläget i Järfälla kommun och renar vatten från Mälaren. Enligt regionala utvecklingsplaner kommer en ökning av antal anslutna personer till Norrvattens distributionsnät att ske fram till år 2050, således behöver en ökad mängd dricksvatten produceras. Enligt framtidsprognoser kommer vattenkvalitén i Mälaren försämras på grund av klimatförändringar. Därmed ställs krav på att reningsprocessen även anpassas till dessa förhållanden. Norrvatten utreder alternativ för ytterligare kapacitet och bättre rening. Inom ramen för detta arbete har bland annat två processlösningar tagits fram som förutsätter att en ny anläggning upprättas på en ny plats och Norrvattens befintliga vattenreningsanläggning tas ur drift. Processlösningarna benämns som Nybyggnation 2, N2, och Nybyggnation, N3, samt är dimensionerade utifrån Norrvattens uppsatta mål och krav för år 2050. I examensarbetet har en miljöeffektsbedömning av de två processlösningarna utförts utifrån ett livscykelperspektiv med ISO-strukturen som grund. Studien har genomförts i syfte att ta fram underlag för vidare arbete med beslut för processval och utformning av Norrvattens framtida vattenverk. Global uppvärmning var den miljöeffekt som visade störst miljöpåverkanspotential vid drift av en framtida anläggning. Försurning visade näst störst miljöpåverkanspotential följt av övergödning. Miljöpåverkanspotentialen för marknära ozon och ozonuttunning var mycket liten i förhållande till de tre förstnämnda. I förhållande till totala utsläpp som bidrar till respektive miljöeffekt var därmed global uppvärmning av störst betydelse. Resultatet från normaliseringen visade att andelen utsläppspotential för försurning var störst följt av övergödning och sist global uppvärmning av de acceptabla belastningsekvivalenterna i Sverige. I förhållande till de acceptabla belastningsekvivalenterna var därmed försurning den mest betydande miljöeffekten följt av övergödning och sist global uppvärmning. Den parameter som bidrog till störst miljöpåverkan var produktion av kemikalier följt av transporter. Energiförbrukningen visade minst miljöpåverkanspotential. Vid fällning med aluminiumsulfat eller järnklorid var kemisk fällning särskilt miljöbelastande i båda processlösningarna. Vid fällning med järnklorid i N2 var miljöbelastningen från delsteget snabbfilter näst störst följt av distributionen, UF-filter och slambehandlingen. I N3 uppvisade istället UF-filter näst störst miljöbelastning följt av distributionen och slambehandlingen
Norrvatten's water treatment plant Görvälnverket is located in Järfälla municipality and purifies water from Mälaren. According to regional development plans, an increase in the number of connected people to the Norrvatten distribution network will take place until 2050. This means that an increased amount of drinking water needs to be produced. According to future forecasts, the water quality in Mälaren will deteriorate due to climate change. Therefore, the purification process needs to be adapted to these conditions. Norrvatten investigates alternatives for additional capacity and better purification. Within the framework of this work, two process solutions have been developed that require the establishment of a new plant at a new site and Norrvatten’s existing water treatment plant being taken out of operation. The process solutions are referred to as New construction 2, N2, and New construction 3, N3, and are dimensioned based on Norrvatten's set goals and requirements for 2050. In the thesis, an environmental impact assessment of the two process solutions was executed from a life cycle perspective with the ISO structure as the basis. The study was executed with the aim of developing a basis for further work with decisions for process selection and design of Norrvatten's future water treatment plant. Global warming was the environmental impact that showed the greatest environmental impact potential. Acidification showed the second largest environmental impact potential, followed by eutrophication. The environmental impact potential for ground-level ozone and ozone depletion was very small compared to the others. In relation to total emissions contributing to the respective environmental impact, global warming was of greatest importance. The results from the normalization showed that the proportion of emission potential for acidification was greatest, followed by eutrophication and last global warming of the acceptable emission equivalents in Sweden. In relation to the acceptable emission equivalents, acidification was of greatest importance, followed by eutrophication and last global warming. The parameter that contributed to the greatest environmental impact was the production of chemicals followed by transports. Energy consumption showed the least potential for environmental impact. When precipitating with aluminum sulphate or iron chloride, the chemical precipitate showed by far the greatest environmental impact potential in both process solutions. When precipitating with iron chloride in N2, the environmental impact from the sub-stage quick filter was second largest, followed by distribution, UF-filter and sludge treatment. In N3, the environmental impact from the sub-stage UF-filter was second largest, followed by distribution and sludge treatment.
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Strömann, Solveig. "Två språk på arbetsplatsen status och förändring /". Vasa : Universitas Wasaensis, 1995. http://catalog.hathitrust.org/api/volumes/oclc/34192595.html.

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Samuelsson, Johan. "En jämförelse mellan två datorprogram för utbytesberäkningar /". Umeå : Sveriges lantbruksuniversitet, 2005. http://epsilon.slu.se/10036726.pdf.

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Leis, Annette. "Den kyrkliga diakonins roll inom ramen för två välfärdssystem : en jämförande fallstudie av två diakoniinstitutioner i Sverige och Tyskland /". Uppsala : Diakonivetenskapliga institutet : Teologiska institutionen, Uppsala universitet [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4503.

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Härdling, Peter. "Bildbaserad rendering : Implementation och jämförelse av två algoritmer". Thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-12312.

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Det här arbetet har gått ut på att jämföra två algoritmer för bildbaserad rendering. Båda algoritmerna använder två bilder som spelats in med formatet MultiView plus depth för att rendera nya mellanliggande vyer av en tredimensionell scen. De tvådimensionella bilderna är kompletterade med djupvärden för varje bildpunkt. Renderingen kan då utföras genom perspektivriktiga transformationer där alla bildpunkters nya positioner projiceras individuellt. I samband med renderingen behöver bland annat mätfel i de ursprungliga bilderna samt skymda partier hanteras. Algoritm I gör det delvis genom utjämning av skarvararna mellan bildernas bidrag till den nya vyn. Algoritm II bygger på att bilderna delas upp i lager där de lager som ansetts vara säkra prioriteras framför lager som har bedömts vara mer riskabla. Algoritmerna har implementerats i Matlab och algoritm II har modifierats genom kompletteringar av dess regler för prioriteringen av lagren till mer komplicerade scener. Algoritm II har visat sig vara bättre på att bevara detaljer i de renderade vyerna och håller en jämnare hastighet vid renderingarna. Den ger även högre och jämnare resultat vid jämförelse med kvalitetsmåttet PSNR men vid jämförelser med MSSIM har den däremot fått något lägre värden. De ytterligare stegen vid renderingen har även ökat renderingstiderna med upp till 40 % jämfört med algoritm I. Författaren ger förslag på områden för fortsatt utveckling av algoritm II. Till exempel bör algoritmen testas vidare för att avgöra om de använda gränsvärdena är generella eller om de måste anpassas till olika scener.
This thesis has been aimed at comparing two algorithms for image-based renderings. Both algorithms uses two images recorded with the MultiView plus depth format, to render new intermediate views of a three-dimensional scene. The two-dimensional images extensions with depth values for each pixel, makes it possible to perform the image warping as perspective projections of all individually pixels to their new positions. During rendering, such as measurement error in the original images and occlusions has to be handled. Algorithm I is partly based on smoothening the joints between the contributions from the two images to the novel view. Algorithm II divides the images into layers, in which layers consid-ered safe has priority over layers that have been defined as more risky. The algorithms have been implemented in Matlab and algorithm II has been modified through additions to the priority rules for the layers to more complex scenes. Algorithm II has proven to be better at preserving the details in the rendered views, and maintains a less varying speed when rendering. It also provides higher and more consistent PSNR values, but in comparison using MSSIM the values are slightly lower. The additional steps have also increased the rendering times by up to 40 % compared to algorithm I. The author suggests areas for further development of algorithm II. For example, the algorithm should be tested further to determine if the used thresholds are general or whether they must be adapted to different scenes.
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Eriksson, Jessica. "Branschinteraktion och institutionell förändring : omvandling i två livsmedelsbranscher /". Umeå : Institutionen för företagsekonomi, Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-171.

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Livros sobre o assunto "TVAA"

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firm), TVAA (Architectural. Thierry van de Wyngaert & Associés. Paris: Éditions La Découverte, 2018.

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Kankkunen, Tina Forsberg. Tvaa kommunala rum: Ledningsarbete i genusmärktatekniska respektive omsorgs- och utbi ldningsverksamheter. Stockholm: Stockholms universitet, 2009.

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Olsson, Yngve B. Två Lagerkviststudier. Växö: Pär Lagerkvist-samfundets förlag, 1993.

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Hartman, Carl Gustav. Mellan två dagar. [Helsinki]: Schildts, 1988.

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Tomeš, Jan. Slovo a tvar. Praha: Torst, 2003.

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Gunnarsson, Hans. Februari: Två berättelser. [Stockholm]: A. Bonniers förlag, 1999.

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Aleksander, Fredro. Två polska komedier. Uppsala: A.N. Uggla och D. Hedman, 2002.

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Niger. Direction générale des impôts., ed. La TVA. [Niamey, Niger]: La Direction, 1985.

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Kšicová, Danuše. Secese: Slovo a tvar. Brno: Masarykova univerzita, 1998.

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Rheʺ hoṅʻʺ Cā pe Sutesī Ta ūʺ. e Mranʻ mā mhu Bimānʻ Cā pe Bhaṇʻ (Rangoon, Burma), eds. Nhacʻ 40 cā tvai. [Rangoon]: Mranʻ mā mhu Bimānʻ Cā pe Bhaṇʻ, 1992.

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Capítulos de livros sobre o assunto "TVAA"

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Ferrara, Pietro, Raphael Fuchs e Uri Juhasz. "TVAL+ : TVLA and Value Analyses Together". In Software Engineering and Formal Methods, 63–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33826-7_5.

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Prado, Raquel, Marco A. R. Ferreira e Mike West. "State-space TVAR models". In Time Series, 169–88. 2a ed. Boca Raton: Chapman and Hall/CRC, 2021. http://dx.doi.org/10.1201/9781351259422-5.

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Alsayer, Dalal Musaed. "TVA in the Desert". In The Routledge Handbook of Infrastructure Design, 258–68. New York: Routledge, 2022. http://dx.doi.org/10.4324/9781003093756-30.

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Elliot, Reed A. "The Tva Experience: 1933-1971". In Man-Made Lakes: Their Problems and Environmental Effects, 251–55. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm017p0251.

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Lev-Ami, Tal, e Mooly Sagiv. "TVLA: A System for Implementing Static Analyses". In Static Analysis, 280–301. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-540-45099-3_15.

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Lilienthal, David E. "Excerpt From TVA: Democracy On The March". In Land of Rivers, editado por Peter C. Mancall, 151–57. Ithaca, NY: Cornell University Press, 2019. http://dx.doi.org/10.7591/9781501738777-037.

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Bhullar, Parmvir Singh, e Jaspreet Kaur Dhami. "PSO-TVAC-Based Economic Load Dispatch with Valve-Point Loading". In Advances in Intelligent Systems and Computing, 823–32. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0448-3_68.

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Newton, Donald W. "TVA Practice in Flood Frequency and Risk Analysis". In Application of Frequency and Risk in Water Resources, 429–38. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3955-4_32.

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Vabres, Régis. "Les plateformes de NFT artistiques et la TVA". In NFT et Droits, 165–73. Toulouse: Presses de l’Université Toulouse Capitole, 2023. http://dx.doi.org/10.4000/11spm.

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Ghosh, Poulami, e Anand Kalwar. "Application of Particle Swarm Optimization-TVAC Algorithm in Power Flow Studies". In Advances in Communication, Devices and Networking, 933–41. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7901-6_100.

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Trabalhos de conferências sobre o assunto "TVAA"

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Elahinia, Mohammad H., Jeong-Hoi Koo e Mehdi Ahmadian. "Shape Memory Alloy Tuned Vibration Absorbers: Robustness Analysis". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60120.

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A conventional passive tuned vibration absorber (TVA) is effective when it is precisely tuned to the frequency of a vibration mode; otherwise, it may amplify the vibrations of the primary system. In many applications, the frequency often changes over time. For example, adding or subtracting external mass on the existing primary system results in changes in the system’s natural frequency. The frequency changes of the primary system can significantly degrade the performance of TVA. To cope with this problem, many alternative TVAs (such as semiactive, adaptive, and active TVAs) have been studied. As another alternative, this paper investigates the use of Shape Memory Alloys (SMAs) in passive TVAs in order to improve the robustness of the TVAs subject to mass change in the primary system. The proposed SMA-TVA employs SMA wires, which exhibit variable stiffness, as the spring element of the TVA. This allows us to tune effective stiffness of the TVA to adapt to the changes in the primary system’s natural frequency. The stimulation model, presented in this paper, contains the dynamics of the TVA along with the SMA wire model that includes phase transformation, heat transfer, and the constitutive relations. The robustness analysis is then performed on both the SMA-TVA and the equivalent passive TVA. For our robustness analysis, the mass of the primary system is varied by 30% of its nominal mass. The simulation results show that the SMA-TVA is more robust than the equivalent passive TVA in reducing peak vibrations in the primary system subject to change of its mass.
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Koo, Jeong-Hoi, Mehdi Ahmadian, Mehdi Setareh e Thomas M. Murray. "Robustness Analysis of Semi-Active Tuned Vibration Absorbers With Magneto-Rheological Dampers: An Experimental Study". In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41835.

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This paper offers an experimental robustness analysis of a semiactive tuned vibration absorber (TVA) as well as a passive TVA. A conventional passive TVA is only effective when it is tuned properly; otherwise, it may amplify the vibrations of the primary system. In many practical applications, inevitable off-tuning of a TVA often occurs because of system’s operating conditions or parameter changes over time. For example, adding or subtracting external mass on the existing primary system results in changes in the system’s natural frequency. The frequency changes of the primary system are responsible for “off-tuning” of TVAs. When TVAs are off-tuned, their effectiveness is sharply reduced. In our experimental robustness analysis, we focused on the dynamic performance of both the passive and the semiactive TVAs when the mass of the primary system changed (mass off-tuning). To this end, a test apparatus was built to represent a two-degree-of-freedom structure model coupled with a TVA. The semiactive TVA considered in this study employed a Magneto-Rheological (MR) damper as its damping element to enhance overall performance. Using this test apparatus, a series of tests were conducted to identify the optimal tuning parameters of each of the TVAs. The optimal tuning parameters were obtained based on equal peak transmissibility criteria. The mass off-tuning tests were then performed on the optimally tuned semiactive TVA and the optimally tuned passive TVA. In order to off-tune the primary mass, the mass of the primary system varied from −23% to +23% of its nominal mass. The experimental results showed that the semiactive TVA with MR dampers are more robust to changes in the primary mass (off-tuning) than the passive TVA.
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Koo, Jeong-Hoi, Fernando Goncalves e Hong Zhang. "Introducing “Advanced” Tuned Vibration Absorbers in an Undergraduate Vibrations Course". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80066.

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The primary objective of this paper is to bridge the theory of tuned vibration absorbers (TVA) with the practice of implementing TVAs in systems. Often, the practice of implementing TVAs in systems is a far departure from the theory expressed in many textbooks. These departures are often required in practice to account for the less than ideal conditions that the TVAs will be operating under. Many retrofitted TVAs use “smart” or active materials along with various control techniques to improve the performance of the traditional TVA proposed in textbooks. The intent of the current paper is to demonstrate several of these modern methods of implementing retrofitted TVAs to undergraduate students. The first author introduced the methods in a junior level vibrations course, and is developing a laboratory experiment. Teaching these advanced TVAs to undergraduate engineering students will help them understand how theories learned in class are used in real world problems, and motivate them to explore new fields of research. After introducing a “textbook” vibration absorber theory, this paper describes principles and operations of a new class of vibration absorbers. In reviewing conventional TVAs, students are introduced to many of the engineering challenges encountered in the implementation of TVAs. One such challenge is inevitable off-tuning caused by system parameter changes with time. After identifying many of the challenges associated with the implementation of TVAs, the students are introduced to many modern solutions to these problems. Many of these solutions involve the use of smart materials, such as piezoceramics, magnetorheological fluids, magnetorheological elastomers, shape memory alloys, etc. Through this experience, students are introduced to many smart materials and have the opportunity to see how these smart materials can provide solutions to many engineering challenges and improve existing technologies.
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Koo, Jeong-Hoi, e Mehdi Ahmadian. "Dynamic Analysis of Semi-Active Tuned Vibration Absorbers Using Closed-Form Equivalent Models". In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/de-23204.

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Abstract The main purpose of this study is to investigate dynamic characteristics of semi-active Tuned Vibration Absorbers (TVAs) using an adjustable damper, such as a Magneto-Rheological (MR) damper. Based on on-off and continuous control polices, closed-form groundhook equivalent models are developed for analytical studies of semi-active TVA models. In addition, the transmissibilities of groundhook equivalent models are compared with passive TVAs. The results indicate that semi-active TVAs, with off-state damping levels within a critical value, are capable of lowering the magnitude of resonant peaks without increasing vibration. In contrast, increasing damping in passive TVAs results in reducing the amplitude of resonant peaks at the expense of increasing vibrations at the tuned frequency. A parametric study of the groundhook TVAs shows that the effectiveness of semi-active TVAs increases with larger on-state damping, larger mass ratio, and smaller off-state damping.
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Norris, Mark A., Keith R. Ptak, Ben A. Zamora e James D. Hart. "Implementation of Tuned Vibration Absorbers for Above Ground Pipeline Vibration Control". In 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-115.

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An overview of recent developments of tuned vibration absorbers (TVAs) for vibration suppression is presented. The paper summarizes some popular theory for analysis and optimal tuning of these devices, discusses various design configurations, and reviews the recent application of TVAs to control wind-induced oscillations of pipelines above the Arctic Circle. Although the wind-induced pipeline vibrations are relatively small, the accumulation of vibration cycles can cause fatigue at pipeline joints. The TVAs used in this application have reduced the RMS displacements of the pipeline by as much as a factor of seven. Additionally, the paper introduces a new overhead TVA installation on the pipeline for accommodating environmental considerations.
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Koo, Jeong-Hoi, e Medhi Ahmadian. "A Comprehensive Off-Tuning Analysis of Damping Controlled Tuned Vibration Absorbers". In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15238.

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The main purpose of this study is to offer a comprehensive off-tuning analysis of a semi-active tuned vibration absorber. A base-excited, single-degree-of-freedom structure with a tuned vibration absorber (TVA) model is adapted as the baseline model for our analysis. Moreover, a non-model based groundhook control (displacement based on-off control or "On-off DBG") is used to control the damping in the TVA. In order to study the effect of off-tuning, numerical models of the damping controlled TVA along with its equivalent passive TVA were developed. Using these models, the optimal tuning parameters of both TVA models were obtained based on minimization of peak transmissibility. The two optimally tuned models were then "off-tuned" by varying the primary structure's mass, stiffness, and damping. Using the peak transmissibility reduction criteria, the dynamic performances of the off-tuned TVAs were evaluated. The results indicate that the peak transmissibility of the semi-active TVA is about 20% lower than that of passive, implying that the semi-active TVA is more effective in reducing vibration levels. The results further indicate that the semi-active TVA is more robust to changes in primary structure mass and stiffness. In summary, the offtuning analyses of the semi-active TVA revealed the practical benefits of using it over the passive counterpart to structures subjected to changes in system parameters.
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Koo, Jeong-Hoi, Mehdi Ahmadian, Mehdi Setareh e Thomas M. Murray. "A Robust Semi-Active Tuned Vibration Absorber for Reducing Vibrations in Force-Excited Structures". In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39202.

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A passive TVA is only effective when it is tuned properly; otherwise, it can magnify the vibration levels. Often, inevitable off-tuning of a TVA occurs due to changes in the primary structure mass and stiffness for force-excited structural systems such as a floor. The main purpose of this study is to evaluate the robustness of semi-active groundhook TVAs to structure mass and stiffness off-tuning. In the case of floor systems, adding external mass to an existing floor, such as people and furniture, will increase the floor mass, and reduce the mass ratio. Theses changes result in off-tuning of the frequency ratio, which is defined by the ratio of the natural frequency of the TVA to the primary structure natural frequency. In order to study the effect of off-tuning, a force-excited equivalent model of a groundhook TVA is developed and its closed-form solutions are obtained for dynamic analysis of such systems. Moreover, the optimal design parameters of both passive and groundhook equivalent semiactive TVA models are obtained based on minimization of peak transmissibility. The two optimally tuned models are compared as the primary mass and primary structure stiffness changes. The results indicate that the peak transmissibility of the groundhook TVA is lower than that of passive, implying that the groundhook TVA is more effective in reducing vibration levels. The results further indicate that the groundhook TVA is more robust to changes in primary structure mass and stiffness.
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Korte, Johannes, Jan Martin Brockmann e Wolf-Dieter Schuh. "A Comparison between Successive Estimate of TVAR(1) and TVAR(2) and the Estimate of a TVAR(3) Process". In ITISE 2023. Basel Switzerland: MDPI, 2023. http://dx.doi.org/10.3390/engproc2023039090.

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Kaipio, J. P., e M. Juntunen. "Deterministic regression smoothness priors TVAR modelling". In 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258). IEEE, 1999. http://dx.doi.org/10.1109/icassp.1999.756319.

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Najeeb, Atahur Rahman, Teddy Surya Gunawan e Abiodun Musa Aibinu. "Nonstationary signal reconstruction from TVAR coefficients". In 2017 IEEE 4th International Conference on Smart Instrumentation, Measurement and Application (ICSIMA). IEEE, 2017. http://dx.doi.org/10.1109/icsima.2017.8311982.

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Relatórios de organizações sobre o assunto "TVAA"

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Bertoni, Eleonora, Gregory Elacqua, Carolina Méndez e Humberto Santos. Teacher Hiring Instruments and Teacher Value Added: Evidence from Peru. Inter-American Development Bank, dezembro de 2020. http://dx.doi.org/10.18235/0003123.

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In this article, we explore whether the evaluation instruments used to recruit teachers in the national teacher hiring process in Peru are good predictors of teacher effectiveness. To this end, we estimate teacher value-added (TVA) measures for public primary school teachers in 2018 and test for their correlation with the results of the 2015 and 2017 national evaluations. Our findings indicate that among the three sub-tests that comprise the first, centralized stage of the process, the curricular and pedagogical knowledge component has the strongest (and significant) correlation with the TVA measure, while the weakest correlation is found with the reading comprehension component. At the second, decentralized stage, we find no significant correlation with our measures of TVA for math, as well as non-robust correlations for the professional experience and classroom observation evaluation instruments. A positive and significant correlation is found between the classroom observation component and TVA for reading. Moreover, we find correlations between our measure of TVA and several teacher characteristics: TVA is higher for female teachers and for those at higher salary levels while it is lower for teachers with temporary contracts (compared to those with permanent positions).
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Flory, Jason R. Evaluation of TVA-1000B Toxic Vapor Analyzer. Fort Belvoir, VA: Defense Technical Information Center, maio de 2013. http://dx.doi.org/10.21236/ada580252.

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Flory, Jason. Bioenvironmental Engineer's Guide to TVA-1000B Toxic Vapor Analyzer. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 2014. http://dx.doi.org/10.21236/ada599152.

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Belles, Randy, Olufemi Omitaomu e Andrew Worrall. TVA Coal-Fired Plant Potential for Advanced Reactor Siting. Office of Scientific and Technical Information (OSTI), outubro de 2021. http://dx.doi.org/10.2172/1826024.

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Foster, T. H. The concept of externality: Implications for TVA Environmental Research Center. Office of Scientific and Technical Information (OSTI), junho de 1994. http://dx.doi.org/10.2172/238512.

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Witherell, C. E. Tubing wastage in fluidized-bed coal combustors (TVA, 20 megawatt AFBC Pilot Plant). Office of Scientific and Technical Information (OSTI), abril de 1989. http://dx.doi.org/10.2172/5881048.

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Graham, R. L., e M. E. Downing. Potential supply and cost of biomass from energy crops in the TVA region. Office of Scientific and Technical Information (OSTI), abril de 1995. http://dx.doi.org/10.2172/83804.

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Christian, Jeffrey E., Anthony C. Gehl, Philip R. Boudreaux e Joshua Ryan New. Campbell Creek TVA 2010 First Year Performance Report July 1, 2009 August 31, 2010. Office of Scientific and Technical Information (OSTI), outubro de 2010. http://dx.doi.org/10.2172/993028.

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Wright, A. L. Literature survey of aerosol and iodine-vapor deposition models relevant to TVA radiation monitor sampling line conditions. Office of Scientific and Technical Information (OSTI), maio de 1988. http://dx.doi.org/10.2172/7254594.

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Witherell, C. E. Tubing wastage in fluidized-bed coal combustors (TVA, 20 megawatt AFBC (Atmospheric Fluidized Bed Combustion) pilot plant). Office of Scientific and Technical Information (OSTI), abril de 1989. http://dx.doi.org/10.2172/5112607.

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