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Добірка наукової літератури з теми "Variation de charge active"

Автор: Grafiati

Опубліковано: 23 вересня 2022

Оновлено: 27 січня 2023

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Статті в журналах з теми "Variation de charge active"

Zhang, Jian Min, Pan Wang, Gao Peng Zhang, Ya Wei Li, and Ting Cao. "Study on Supercapacity Properties of Manganese Dioxide Active Material by the Cation Concentration Change on the Electrode Surface." Advanced Materials Research 734-737 (August 2013): 2411–14. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2411.

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A four-electrode system was developed to measure in-situ the cation concentration change on the supercapacitor electrode surface for the first time during the charge/discharge process. While the MnO2 electrode was used in a supercapacitor in K2SO4 solution, the potassium ion concentration on the electrode surface was reversible change during the charging/discharging process, decreasing with the reduction process and increasing with the oxidation process. It is clearly clarified that the charge storage mechanism of manganese dioxide, as a supercapacitor active material, involves a fast redox reaction through reversible insertion/desertion of potassium ion and variation of manganese valance.

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Ravikumar, V., R. P. Rodrigues, and V. P. Dravid. "Direct imaging of spatially varying potential and charge across internal interfaces in solids." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 316–17. http://dx.doi.org/10.1017/s0424820100137951.

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The importance of spatially varying potential (and thus charge) across lattice discontinuities in solids has been recognized in many technologically important systems, especially those containing electrically active interfaces, e.g. electroceramics. The presence of spatially varying potential across electroceramic interfaces has been indirectly deduced and analyzed using predominantly bulk measurement techniques like I-V, C-V curves and impedance spectroscopy. Direct imaging of spatially varying electrostatic potential profile and determination of the sign, magnitude and spatial distribution of the associated interface- and space- charge (and therefore defect density) in electroceramics have remained elusive.We have utilized the technique of transmission high energy electron holography to directly image and quantify the electrostatic potential across grain boundaries (GBs) in SrTiO3, a functional electroceramic. The phase of the exit wave function at the GB region can be altered by : (i) variation in local mean inner potential (related to the change in density of atoms at the GB), (ii) differential diffraction conditions across the interface, (iii) change in the local specimen thickness and, (iv) presence of local electrostatic (electrical charge) and magnetic potential.

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García-Montoya, Isui Abril, Norma Rosario Flores-Holguín, Linda-Lucila Landeros-Martínez, Mónica Alvarado-González, Quintín Rascón-Cruz, María Elena Fuentes-Montero, Pedro Palomares-Báez, and Luz María Rodríguez-Valdez. "Analysis of the Molecular Interactions between Cytochromes P450 3A4 and 1A2 and Aflatoxins: A Docking Study." Applied Sciences 9, no. 12 (June 17, 2019): 2467. http://dx.doi.org/10.3390/app9122467.

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Mycotoxins known as aflatoxins (AF) are produced as a secondary metabolite by some species of Aspergillus fungi. They are considered carcinogenic, hepatotoxic, teratogenic, and mutagenic. In this study, the molecular structure, chemical reactivity, and charge transfer values of AFB1, B2, G1, and G2 were analyzed using density functional theory. Different methodologies—B3LYP/6-311G(d,p) and M06-2X/6-311G(d,p)—were applied for geometrical calculations. Chemical reactivity parameters were used in the calculation of charge transfer values during the interaction between protein and ligand. The binding energy, the electrostatic interactions, and the amino acids of the active site were determined by molecular docking analysis between AF and cytochromes P450 (3A4 and 1A2), employing different PDB files (CYP3A4:1TQN, 2V0M, 4NY4 and 1W0E, and CYP1A2:2HI4). Molecular docking analysis indicated that the central rings of the AF are involved in the interaction with the HEM group of the active site. The differences in the molecular structure of the AF affect their position regarding the HEM group. The resulting configurations presented considerable variation in the amino acids and the position of the coupling. The charge transfer values showed that there is oxidative damage inside the active site and that the HEM group is responsible for the main charge transferences.

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Johnson, Kevin D., and Vinayak P. Dravid. "Dynamics Of Grain Boundary Space-Charge Potential In Electroceramics." Microscopy and Microanalysis 5, S2 (August 1999): 100–101. http://dx.doi.org/10.1017/s1431927600013829.

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A large number of bulk and thin-film electroceramic systems contain electrically active interfaces which dictate the various useful electronic properties of these devices. The electrical activity of these interfaces stems from a complex interplay among various interfacial attribute but often involves formation of some form of electrostatic potential at the interfaces which is modified under applied bias of current and/or voltage.Figure la schematically shows charge distribution at a model grain boundary (GB), while Figure 1(b) shows its corresponding potential distribution. As shown in Figure 1(c), the energy band structure bends opposite to this built-in potential, causing a downward shift at the grain boundary . The difficulty with evaluating the Schottky barrier model, which is often invoked to explain GB electrical activity, is that the charge density distribution and therefore the band bending is expected to dynamically alter as bias is applied across the grain boundary. This variation adds another level of complexity to theoretical descriptions of the barrier behavior

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Tian, Jing, Zhengke Pan, Shenglian Guo, Jiabo Yin, Yanlai Zhou, and Jun Wang. "Response of active catchment water storage capacity to a prolonged meteorological drought and asymptotic climate variation." Hydrology and Earth System Sciences 26, no. 19 (October 6, 2022): 4853–74. http://dx.doi.org/10.5194/hess-26-4853-2022.

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Abstract. Studies on the hydrological response to continuous extreme and asymptotic climate change can improve our ability to cope with intensified water-related problems. Most of the literature focused on the runoff response to climate change, while neglecting the impacts of the potential variation in the active catchment water storage capacity (ACWSC) that plays an essential role in the transfer of climate inputs to the catchment runoff. This study aims to systematically identify the response of the ACWSC to a long-term meteorological drought and asymptotic climate change. First, the time-varying parameter is derived to reflect the ACWSC periodic and abrupt variations in both drought and non-drought periods. Second, the change points and varying patterns of the ACWSC are analyzed based on the Bayesian change point analysis with multiple evaluation criteria. Finally, various catchment properties and climate characteristics are used to explore the possible relationship between these variables and the temporal variation characteristics of the ACWSC. The catchments that suffered from a prolonged meteorological drought in southeast Australia were selected as the case study. Results indicate that: (1) the increase in amplitude change in the ACWSC is observed in 83/92 catchments during the prolonged drought period, and significant shifts in the mean value of the ACWSC are detected in 77/92 catchments; (2) the average response time of the ACWSC for all 92 catchments with significant changes is 641.3 d; (3) the values of the ACWSC changed significantly in the catchments with small areas, low elevations, small slope ranges, large forest coverage, and high soil water-holding capacities. This study could enhance our understanding of the variations in catchment property under climate change.

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Gálvez, M. C., D. Montes, M. J. Fernández-Figueroa, E. De Castro, and M. Cornide. "Orbital Period Variation in the Chromospherically Active Binary FF UMa (2RE J0933+624)." Proceedings of the International Astronomical Union 2, S240 (August 2006): 706–13. http://dx.doi.org/10.1017/s1743921307006102.

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AbstractWe present here a detailed study of FF UMa (2RE J0933+624), a recently discovered, X-ray/EUV selected, active binary system with strong Hα emission. By using high-resolution echelle spectroscopic observations taken during five observing runs from 1998 to 2004, we derived precise radial velocities that allowed us to determine the orbital solution of the system at different epochs. Analyzing these orbital solutions, together with a previous one determined in 1993 by other authors, we have found a change in the heliocentric Julian date on conjunction (Tconj) that can be explained by a change with time in the orbital period of the system. The relative amplitude of the orbital period variation derived from these data was dP/P ≈ 5 x 10−4, which is larger than the variations found in other similar chromospherically active binaries like AR Lac and HR 1099. This orbital period variation can be related (Applegate 1992; Lanza 1998, 2006) with the modulation of the gravitational quadrupole-moment of its magnetically active secondary star produced by angular momentum exchanges within its convective envelope. In addition, using these observations, we have determined the stellar parameters of the components and we have carried out a study of the chromospheric activity using all the optical indicators from Ca ii H&K to Ca ii IRT lines.

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Cordaro, Enrique G., Patricio Venegas, and David Laroze. "Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin." Annales Geophysicae 36, no. 1 (March 1, 2018): 275–85. http://dx.doi.org/10.5194/angeo-36-275-2018.

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Abstract. We present a different view of secular variation of the Earth's magnetic field, through the variations in the threshold rigidity known as the variation rate of geomagnetic cutoff rigidity (VRc). As the geomagnetic cutoff rigidity (Rc) lets us differentiate between charged particle trajectories arriving at the Earth and the Earth's magnetic field, we used the VRc to look for internal variations in the latter, close to the 70° south meridian. Due to the fact that the empirical data of total magnetic field BF and vertical magnetic field Bz obtained at Putre (OP) and Los Cerrillos (OLC) stations are consistent with the displacement of the South Atlantic magnetic anomaly (SAMA), we detected that the VRc does not fully correlate to SAMA in central Chile. Besides, the lower section of VRc seems to correlate perfectly with important geological features, like the flat slab in the active Chilean convergent margin. Based on this, we next focused our attention on the empirical variations of the vertical component of the magnetic field Bz, recorded in OP prior to the Maule earthquake in 2010, which occurred in the middle of the Chilean flat slab. We found a jump in Bz values and main frequencies from 3.510 to 5.860 µHz, in the second derivative of Bz, which corresponds to similar magnetic behavior found by other research groups, but at lower frequency ranges. Then, we extended this analysis to other relevant subduction seismic events, like Sumatra in 2004 and Tohoku in 2011, using data from the Guam station. Similar records and the main frequencies before each event were found. Thus, these results seem to show that magnetic anomalies recorded on different timescales, as VRc (decades) and Bz (days), may correlate with some geological events, as the lithosphere–atmosphere–ionosphere coupling (LAIC).

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Said, Sayed M., and Bálint Hartmann. "Alleviation of Extremely Power and Voltage Variations Caused by Wind Power and Load Demand Using SMES." Periodica Polytechnica Electrical Engineering and Computer Science 63, no. 3 (March 18, 2019): 134–43. http://dx.doi.org/10.3311/ppee.13718.

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Due to the high variations in wind speed and the continuing changes in load power demand (LPD), power and voltage at the point of common coupling (PCC) fluctuate according to the variations of injected wind power generation (WPG) and LPD simultaneously. Superconducting magnetic energy storage (SMES) plays a significant role in alleviating the power/voltage at PCC. This paper shows the impact of SMES in enhancing the performance of interconnected WPG system during high wind gust variations and the changes in LPD. WPG includes squirrel-cage induction generator (SCIG) type with a shunt-connected capacitor for improving the power factor. WPG, SMES and the load are located at PCC. Fuzzy logic control (FLC) is used with the DC-DC chopper to control the power exchange between AC system and SMES. FLC is designed where SMES can absorb/inject real power from/to the grid. On the other hand, reactive power is controlled to adjust the variation of PCC voltage. Two inputs are applied to the FLC; the summation of wind power variation and change of LPD as the first input and the variation of SMES current is the second one to control active power transferred between SMES and AC system. The suggested control approach of SMES is a fast response, as it successfully controlled the PCC voltage, line active and reactive powers during wind gusts and the variations of the load side.

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Munshi, Parthapratim, and Kunal Jha. "Exploring Charge Transfer Mechanism in Organic NLO (Polymorphic) Materials." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C378. http://dx.doi.org/10.1107/s2053273314096211.

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The understanding of nonlinear polarization mechanism and their relation to the structural characteristics of non-linear optical (NLO) materials have been utmost importance considering a surge in the information technology and industrial applications. Some investigations in search of NLO materials have been carried out on organic molecule scaffolds such as stilbene and chalcone having π-e-donor acceptor substituent which facilitates intermolecular charge transfer; leading to the generation of good frequency conversion materials. Few of such materials are known to exhibit polymorphic characters and most of which crystallize in non-centrosymmetric space group – necessity for a NLO material. It has been realized that the chirality, polymorphic character and NLO activity of the chalcone derivatives are mainly governed by both the substitutions at the para position and the position of sulfur atom in the thiophene ring of thienylchalcone. This presentation will highlight the preliminary results towards the analyses of electron density distributions on NLO active stilbene and chalcone derivatives and their polymorphic forms. Therefore, explore the charge transfer mechanism responsible for the variation of NLO activity across these systems and on their non-centrosymmetric polymorphic forms. Charge densities modelled using both multipole formalism (Hansen & Coppens, 1978) and X-ray constraint wavefunction fittings (Jayatilaka & Grimwood, 2001) will be considered for these studies.

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Marin, F., and D. Hutsemékers. "Tracking the state transitions in changing-look active galactic nuclei through their polarized-light echoes." Astronomy & Astrophysics 636 (April 2020): A23. http://dx.doi.org/10.1051/0004-6361/201936123.

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Context. Variations in the mass accretion rate appear to be responsible for the rapid transitions in spectral type that are observed in increasingly more active galactic nuclei (AGNs). These objects are now labeled “changing-look” AGNs and are key objects for understanding the physics of accretion onto supermassive black holes. Aims. We aim to complement the analysis and interpretation of changing-look AGNs by modeling the polarization variations that can be observed, in particular, polarized-light echoes. Methods. We built a complex and representative model of an AGN and its host galaxy and ran radiative transfer simulations to obtain realistic time-dependent polarization signatures of changing-look objects. Based on actual data, we allowed the system to become several times fainter or brighter within a few years, assuming a rapid change in accretion rate. Results. We obtain time-dependent polarization signatures of distant high-luminosity (quasars) and nearby low-luminosity (Seyferts) changing-look AGNs for a representative set of inclinations. We predict the evolution of the continuum polarization for future polarimetric campaigns with the goal to better understand the physics at work in these objects. We also investigate highly inclined AGNs that experience strong accretion rate variations without appearing to change state. We apply our modeling to Mrk 1018, the best-documented case of a changing-look AGN, and predict a variation in its polarization after the recent dimming of its continuum. Conclusions. We demonstrate that polarization monitoring campaigns that cover the transitions that are observed in changing-look AGNs might bring crucial information on the geometry and composition of all the reprocessing regions within the nucleus. In particular, specific features in the time variation of the polarization position angle can provide a new and efficient method for determining AGN inclinations.

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Більше джерел

Дисертації з теми "Variation de charge active"

Capelli, Thomas. "Amplificateur de puissance pour réseaux phasés d’antenne 5G multi-bande en technologie ST CMOS065SOIMMW." Thesis, Bordeaux, 2022. http://www.theses.fr/2022BORD0176.

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Les télécommunications mobiles, afin de subvenir à leurs insatiables besoins, trouvent des moyens d’améliorer leurs capacités depuis maintenant plus de trente ans. En 2019 la cinquième génération (5G) est à l’épreuve afin de garantir une connexion non seulement au marché des téléphones mobiles toujours croissant, mais aussi au vaste univers de l’internet des objets (IoT). Afin de pouvoir remplir ses objectifs, la 5G marque une expansion sans précédent en matière de bandes de fréquences utilisées. En effet, des bandes jusqu’à 60 GHz et plus font partie des ambitions du réseau et cela implique de radicaux changements technologiques qui impactent toute l’électronique dédiée. Nouvelles fréquences plus élevées, pertes de propagation dans l’air plus élevées et niveau d’exigences relevé, les réseaux phasés d’antenne sont introduits pour pallier à toutes ces contraintes et imposent une toute nouvelle architecture système et une interface inédite pour les front-end RF des communications mobiles.Dans ce travail, nous proposons donc une analyse de ces réseaux d’antennes phasés et des contraintes qu’ils représentent en particulier pour les amplificateurs de puissance (PA), tel que la variation de charge parasite et le comportement des composantes générées par le comportement non-linéraire de ces derniers. Une évaluation de la variation de charge active due aux différents couplages existants dans les réseaux d’antennes est proposée ainsi que de son impact sur la performance des amplificateurs notamment en termes d’efficacité (PAE). Le comportement des non-linéarités telles que les produits d’intermodulation du troisième ordre (IMD3) est montré dans les réseaux d’antennes. Un concept utilisant le principe de génération et d’orientation de faisceau des réseaux d’antennes est proposé, permettant de relâcher les contraintes de linéarité des amplificateurs 5G et ainsi de permettre une réduction de leur consommation d’énergie. Une implémentation d’un PA utilisant ce principe est démontrée en technologie ST CMOS 65 nm PD-SOI à 28 GHz
Mobile telecommunications, in order to support its insatiable needs, has been finding ways to improve its capabilities for over thirty years now. In 2019 the fifth generation (5G) is on trial to ensure connection not only to the ever-growing cell phone market, but also to the vast world of the Internet of Things (IoT). In order to meet its goals, 5G marks an unprecedented expansion in the frequency bands used. Indeed, bands up to 60 GHz and beyond are part of the network's ambitions and this implies radical technological changes that impact all dedicated electronics. New higher frequencies, higher propagation losses in the air, and higher requirements, antenna phased arrays are introduced to overcome all these constraints and impose a completely new system architecture and interface for the RF front-end of mobile communications.In this work, we propose an analysis of these phased antenna arrays and the constraints they represent particularly for power amplifiers (PA), such as the parasitic load variation and the behavior of the components generated by the non-linear behavior of the latter. An evaluation of the active load variation due to the different coupling existing in the antenna networks is proposed as well as its impact on the performance of the amplifiers, particularly in terms of power added efficiency (PAE). The behavior of nonlinearities such as third-order intermodulation products (IMD3) is shown in antenna arrays. A concept using the principle of beam generation and steering of antenna arrays is proposed, allowing for relaxing the linearity constraints of 5G amplifiers and thus allowing a reduction of their power consumption. An implementation of an AP using this principle is demonstrated in ST CMOS 65 nm PD-SOI technology at 28 GHz

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Leclerc, Julien. "Utilisation innovatrice de l'aluminium dans les ponts : effets de la variation de la température sur le comportement structural d'un tablier à platelage d'aluminium sur poutres d'acier, à action composite." Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/30272.

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Le présent document traite de l'utilisation d'un nouveau platelage en aluminium, présentement développé à l'Université Laval. Ce nouveau platelage, d'une hauteur de 200 mm, se veut une alternative aux dalles en béton armé couramment utilisées dans les ponts routiers. Il est proposé de connecter le platelage à des poutres en acier à l'aide d'une connexion boulonnée antiglissement utilisant des boulons en acier galvanisé ASTM F3125/F3125M-15a de grade A325 et de diamètre M20. L'optique est de développer une action composite totale afin d'obtenir la pleine capacité de la poutre mixte. Cependant, le coefficient de dilatation thermique de l'aluminium étant le double de celui de l'acier, des mouvements différentiels entre le platelage en aluminium et les poutres en acier sont possibles suite à des variations de température. Le comportement de cet assemblage sous les charges thermiques doit donc être étudié. Ce projet propose d'utiliser la méthode des éléments finis à l'aide du logiciel commercial Abaqus afin de déterminer le comportement de cet assemblage face à la combinaison des charges thermiques et mécaniques à l'état limite d'utilisation (ÉLUT) ainsi qu'à l'état limite ultime (ÉLUL). Ces charges sont déterminées à partir des directives du Code canadien sur le calcul des ponts routiers (CAN/CSA S6-14). Les résultats montrent qu'il est possible de développer l'action composite totale entre le platelage en aluminium et les poutres en acier. Aussi, en suivant les recommandations prescrites par cette étude, il est possible de prévenir le glissement sous les charges thermiques et de maintenir le comportement antiglissement de l'assemblage à l'ÉLUT en plus de prévenir la rupture de l’assemblage boulonné sous la combinaison des charges thermiques et mécaniques à l’ÉLUL.
This project concerns the use of a new aluminium bridge deck that is being developed at Université Laval. It is a 200 mm deep aluminium bridge deck, which represents an alternative to the reinforced concrete slabs in bridges. This project proposes to connect the aluminium bridge deck to steel girders using galvanized ASTM F3125/F3125M-15a grade A325 bolts of diameter M20 in a slip-critical connection. Full composite action between the deck and the girders is expected in order to develop the full capacity of the composite section. However, the coefficient of thermal expansion of aluminium, being twice that of steel, differential movements may occur during temperature changes. To understand the behavior of the bolted connection under such thermal loadings, this project uses finite element model with the Abaqus software. The combinations of dead, live and thermal loads at the ultimate limit state (ULS) and serviceability limit state (SLS) are studied. The loads are calculated according to the Canadian Highway Bridge Design Code (CAN/CSA S6-14). Results confirm that full composite action between the aluminium deck and the steel girders can be achieved. Moreover, by following the recommendations of this study, it is possible to eliminate the sliding that may occur during the thermal loading of the beam at the serviceability limit state (SLS). This study also offers a solution to prevent the failure of the bolted connections following the combination of thermal and mechanical loads.

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Chuang, Ying-Chieh. "Floating capacitor active charge balancing for PHEV applications." Connect to resource, 2010. http://hdl.handle.net/1811/45430.

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Vaughan, Joshua Eric. "Use of Active and Semi-Active Control to Counter Vehicle Payload Variation." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5251.

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All vehicles have changing payloads that affect their dynamic response. Compared to passenger vehicles, heavy machinery have larger and more greatly varying payload masses, higher centers of mass, and encounter larger disturbances. These factors lead to significant increases in the amount of vibration experienced by heavy machinery operators. This fact, when coupled with the large amount of exposure time that a typical heavy machinery operator incurs, leads to much greater vibration dosage values for the heavy machinery operator. In addition, the heavy machinery operator faces equal or greater opportunity for accident. The chance of accident, along with the increased vibration dosage, leads to an operating condition with significant safety risks, both short and long term. It has been shown that payloads affect both the stability and vibration isolation properties of a vehicle. Large payloads reduce vehicle stability while increasing the amount of vibration transmitted to the operator. A method to compensate for these loading affects would prove to be a useful technique to increase the safety of the vehicle, both in terms of accident avoidance and long term health effects of vibration. This thesis provides such payload compensation techniques. Improved vehicle dynamics were accomplished with the use of both active and semi-active suspension control. The active systems used are optimal control based, and provided the greatest improvements in vehicle performance. An optimal controller designed around a nominal payload, however, proved insufficient for operation over the entire payload range due to too large peak actuator forces at low payloads. A multiple model approach was used to remedy this problem. Semi-active systems based on a Linear Quadratic Regulator with output feedback and damping selection via static deflection were developed. The semi-active systems would require far less power than the active systems, with the need for knowledge of fewer systems states. It was shown that despite these lower demands, the semi-active systems closely approach the performance of the fully active systems.

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Schoenenberger, Sandrine. "Variation de prise en charge des patients : discrimination dans les soins et/ou charge de travail élevée." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0419/document.

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Les études françaises sur la discrimination en milieu médical s’intéressent aux refus de soins des libéraux selon le système d’assurance des patients. Les recherches anglo-saxonnes examinent les différences de prises en charge sous l’angle de l’ethnie du patient. Burgess (2010) suggère que les discriminations en milieu médical peuvent être plus fréquentes lorsque le soignant est placé sous un niveau élevé de charge cognitive. Les recherches dans le domaine de la psychologie du travail et l’ergonomie indiquent que dans les cas de surcharge de travail, l’opérateur modifie son activité. Les comportements qualifiés de discriminatoires pourraient alors être le résultat des mécanismes de régulation de la charge de travail. Deux vagues d’entretiens auprès de soignants (N = 22 pour la première étude et N = 6 pour la seconde) indiquent un lien de leur part entre discrimination et charge de travail. Les observations menées en milieu hospitalier et couplées à un questionnaire et le NASA-TLX (N = 121) ont permis de constater que les discriminations en milieu médical sont faibles. Elles concernent uniquement la dimension relationnelle, les actes médicaux (examens, soins) sont réalisés normalement. Les variations constatées dans les comportements des soignants adviennent à l’encontre de patients stigmatisés et difficiles à gérer
The French studies about discrimination in medical settings are focused on the general practitioners’ refusal to provide care depending on the patient’ insurance cover. Anglo-Saxon research examines the differences in care according to the patient’s ethnicity. Burgess (2010) suggests that discriminations in healthcare settings may happen more frequently when health care providers are put under high levels of cognitive load. Research in the fields of occupational psychology and ergonomics indicates that in cases of work overload, workers change their activity. Behavior described as discriminatory might result from regulation mechanisms of work overload regulation mechanisms. Two waves of interviews with healthcare providers (N = 22 for the first time and N = 6 for the second time) point to a link between discrimination and workload. Observations conducted in hospital settings and associated with a questionnaire as well as the NASA-TLX (N = 121) have shown that discriminations in a medical environment are limited. They are only related to the interpersonal aspect of care: medical acts (examination, care) are properly completed. The variations in the healthcare providers’ behavior occur when dealing with stigmatized patients and patients who are difficult to manage

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Greig, Thomas Alexander. "Development of CMOS active pixel sensors." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5345.

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This thesis describes an investigation into the suitability of complementary metal oxide semiconductor (CMOS) active pixel sensor (APS) devices for scientific imaging applications. CMOS APS offer a number of advantages over the established charge-coupled device (CCD) technology, primarily in the areas of low power consumption, high-speed parallel readout and random (X-Y) addressing, increased system integration and improved radiation hardness. The investigation used a range of newly designed Test Structures in conjunction with a range of custom developed test equipment to characterise device performance. Initial experimental work highlighted the significant non-linearity in the charge conversion gain (responsivity) and found the read noise to be limited by the kTC component due to resetting of the pixel capacitance. The major experimental study investigated the contribution to dark signal due to hot-carrier injection effects from the in-pixel transistors during read-out and highlighted the importance of the contribution at low signal levels. The quantum efficiency (QE) and cross-talk were also investigated and found to be limited by the pixel fill factor and shallow depletion depth of the photodiode. The work has highlighted the need to design devices to explore the effects of individual components rather than stand-alone imaging devices and indicated further developments are required for APS technology to compete with the CCD for high-end scientific imaging applications. The main areas requiring development are in achieving backside illuminated, deep depletion devices with low dark signal and low noise sampling techniques.

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Attallah, Faouzi. "Variation des périodes radioactives en fonction de l'état de charge atomique : cas du ¹²⁵Te." Bordeaux 1, 1994. http://www.theses.fr/1995BOR1A522.

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SIVERTI, ARNAUD. "Commande a structure variable appliquee au positionnement d'une charge mecanique a forte variation parametrique." Amiens, 2000. http://www.theses.fr/2000AMIE0113.

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Aujourd'hui, les actionneurs electriques doivent realiser des taches de plus en plus precises tout en evoluant dans des environnements ou les variations brusques de configuration mecanique sont frequentes et consequentes (variation d'inertie, de frottement visqueux et de couple de charge). C'est alors a la partie commande que l'on confie le soin de faire face aux variations de l'environnement pour fournir des signaux qui permettront a l'actionneur de repondre aux specifications demandees. Aussi, avec l'arrivee des processeurs numeriques, de nombreuses theories telles que la commande predictive, la commande optimale ou encore la commande adaptative sont apparues dans la litterature. Appliques aux moteurs electriques, ces algorithmes presentent des proprietes remarquables d'insensibilite vis a vis de l'environnement mecanique. Cependant, ces techniques innovantes n'ont pas reussi a penetrer le monde industriel du fait de leur important volume de calcul qui necessite l'emploi de plateforme informatique du type dsp (digital signal processor). L'objectif de cette these consiste donc a appliquer la theorie de la commande a structure variable (csv) a un moteur a courant continu entrainant une charge mecanique a forte variation parametrique telle qu'on la rencontre en commande numerique de machines-outils ou en robotique. Le but final est de determiner un algorithme qui soit a la fois robuste et implantable sur une architecture informatique peu onereuse du type microcontroleur. Deux approches de csv, l'une classique (csv par commutation au niveau de l'organe de commande) et l'autre plus originale (csv par modification du retour d'etat) sont testees dans un premier temps en simulation a l'aide de profils de deplacement types. Une fois cette phase de tests terminee, ces deux techniques sont implantees sur un microcontroleur intel 80c196kb puis validees experimentalement a l'aide d'un banc d'essais a configuration mecanique variable mis au point avec le partenaire industriel.

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Lavallée, Bernard. "Variation du taux de dépérissement de la biomasse active hétérotrophe du modèle ASM1." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ57817.pdf.

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Pan, Fangfang [Verfasser]. "Crystal Engineering and Charge Density Studies on Pharmaceutically Active Derivatives of Sulfonamides / Fangfang Pan." Aachen : Shaker, 2013. http://d-nb.info/1050344375/34.

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Книги з теми "Variation de charge active"

Students taking charge: Inside the learner-active, technology-infused classroom. Larchmont, NY: Eye on Education, 2011.

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Campbell, Garry. Who's in charge?: Collaborating for class management in an active learning classroom. Mississauga, Ont: Peel Board of Education, 1991.

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J, Allen Ronald. Arthritis of the hip & knee: The active person's guide to taking charge. Edited by Brander Victoria Anne, Stulberg S. David, and Lee Patricia A. Atlanta: Peachtree Publishers, 1998.

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An active repertoire for black: King's Indian defence and Sicilian defence (Scheveningen variation). New York: Henry Holt, 1992.

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Marović, Drazen. An active repertoire for black: King's Indian defence and Sicilian defence (Scheveningen variation). London: Batsford, 1991.

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J, Allen Ronald. Arthritis of the hip and knee: The active person's guide to taking charge. Edited by Stulberg S. David, Brander Victoria Anne, and Lee Patricia A. Atlanta: Peachtree Publishers, 1998.

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Giulio, Milazzo, and Blank Martin 1933-, eds. Bioelecrochemistry III: Charge separation across biomembranes. New York: Plenum Press, 1990.

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Self-directed IRAs for the active investor: Taking charge of building your nest egg. Chicago, Ill: Probus Pub. Co., 1986.

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Integration, Variation, Destruktion: Die "Crône" Heinrichs von dem Türlin innerhalb der Gattungsgeschichte des deutschen Artusromans. Bern: P. Lang, 2000.

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Fiore, Neil A. Coping with the emotional impact of cancer: Become an active patient and take charge of your treatment. Point Richmond, Calif: Bay Tree Pub., 2009.

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Частини книг з теми "Variation de charge active"

Johnson-Hanks, Jennifer A., Christine A. Bachrach, S. Philip Morgan, and Hans-Peter Kohler. "The Theory of Conjunctural Action." In Understanding Family Change and Variation, 1–22. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1945-3_1.

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Haumann, Dagmar. "Active and passive tough-infinitives." In Reorganising Grammatical Variation, 269–96. Amsterdam: John Benjamins Publishing Company, 2018. http://dx.doi.org/10.1075/slcs.203.10hau.

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Becerra-Fajardo, Laura, and Antoni Ivorra. "Charge Counter for Performing Active Charge-Balance in Miniaturized Electrical Stimulators." In IFMBE Proceedings, 256–59. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-11128-5_64.

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Shizuka, Toshiki, and Kenichi Ida. "A Proposal of a Genetic Algorithm for Bicriteria Fixed Charge Transportation Problem." In Active Media Technology, 352–58. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-02750-0_38.

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Hsu, D. Frank, Takehito Ito, Christina Schweikert, Tetsuya Matsuda, and Shinsuke Shimojo. "Combinatorial Fusion Analysis in Brain Informatics: Gender Variation in Facial Attractiveness Judgment." In Active Media Technology, 8–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23620-4_4.

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Zhang, Lei, and Hermann Berg. "Electrofusion Yield Modified by Membrane-Active Substances." In Charge and Field Effects in Biosystems—3, 497–502. Boston, MA: Birkhäuser Boston, 1992. http://dx.doi.org/10.1007/978-1-4615-9837-4_39.

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Zou, Xuan, Josef Kittler, and Kieron Messer. "Ambient Illumination Variation Removal by Active Near-IR Imaging." In Advances in Biometrics, 19–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11608288_3.

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Terner, James, Andrew J. Sitter, and John R. Shifflett. "Resonance Raman Spectroscopic Characterization of the Oxidation of the Horseradish Peroxidase Active Site." In Charge and Field Effects in Biosystems—2, 31–42. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0557-6_4.

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Eckert, Christoph, and Jens Gottlieb. "Direct Representation and Variation Operators for the Fixed Charge Transportation Problem." In Parallel Problem Solving from Nature — PPSN VII, 77–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45712-7_8.

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Bakes, E. L. O., and A. G. G. M. Tielens. "Charge Variation of Polycyclic Aromatic Hydrocarbons in the Diffuse Interstellar Medium." In The Diffuse Interstellar Bands, 315–21. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0373-2_31.

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Тези доповідей конференцій з теми "Variation de charge active"

Ranjandish, Reza, and Alexandre Schmid. "An active charge balancing method based on anodic current variation monitoring." In 2017 IEEE Biomedical Circuits and Systems Conference (BioCAS). IEEE, 2017. http://dx.doi.org/10.1109/biocas.2017.8325209.

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Ku, Tsung-Yen, Paul C. P. Chao, Chin-Hai Huang, En-Chih Liu, Ming-Hua Yeh, Han-Chang Chen, and Tong-Wen Wang. "Design and Implement the Readout Circuit of an In-Cell High-Resolution Capacitive Touch Panel." In ASME 2017 Conference on Information Storage and Processing Systems collocated with the ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/isps2017-5436.

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This paper proposes a high resolution capacitive touch panel readout circuit to sense the Variation by self-capacitance method. This AM display of in-cell structure includes an active architecture for improved resolution, that controlling the TFT (Thin-film transistor) to make the accuracy better. In addition, the panel has 60 sensing point per 0.88 inches and the proposed readout circuit used switched capacitor charge amplifier (SCCA) to sensing the charge change and enhances the SNR (Signal-to-noise) by eliminating the baseline. The experimental results show that the proposed readout circuit SNR achieves 38dB and the frame rate is 200Hz.

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Anusonti-Inthra, Phuriwat, and Farhan Gandhi. "Narrow-Band Disturbance Rejection Using Semi-Active Control." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/ad-23727.

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Abstract The present study examines the potential of using a semi-active controllable damper, whose damping coefficient can be modulated in real-time, for narrow-band disturbance rejection applications. A frequency-domain optimal control algorithm is developed for determining the controllable damper input (of twice the disturbance frequency) that minimizes the force transmitted to the support at the disturbance frequency. The effectiveness of both open-loop and closed-loop controllers in rejecting the transmitted disturbances are evaluated. The results of the study indicate that for physically achievable damping coefficient variations, the support force could be reduced by about an additional 30%, beyond the levels due to the passive isolation characteristics (no damping coefficient variation). When the disturbance phase changed during the simulation, the effectiveness of the open-loop controller reduced, while the closed-loop controller was still able to generally reduce vibrations to levels lower than those due to pure passive isolation. Even so, closed-loop control of the semi-active damper was not able to completely maintain the level of reduction in vibration when the disturbance phase changed, suggesting that an adaptive controller may be necessary.

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Kim, YoungSeok, Kiju Kim, Seung-Seo Hong, and Wanjei Cho. "The Variation of Physical Properties in Frozen Soils at Various Freezing Temperatures." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23113.

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Due to the recent climate change, the colder and longer winter is expected in Korea. Besides, the recent participation agreement on the development of the natural gas pipeline in Russia and construction of the second Korean Antarctic research station, the Jangbogo station changes the research interests from the seasonally frozen ground to the permafrost ground. The recent development of the site investigation techniques using wave propagation and electrical resistivity enabled engineers to evaluate the physical properties of the frozen soils and further correlate them to the mechanical properties. However, the physical properties of the frozen ground change when the water in the soil solidifies to ice; this change is particularly notable between 0 and −10°C. Therefore, the physical property changes due to freezing needs to be investigated in terms of wave propagation characteristics and electrical resistivity with regard to the various freezing temperatures. In this study, the characteristics of wave propagation and electrical resistivity of frozen soils are investigated under various sub-zero temperatures. The characteristics of wave propagations are analyzed in terms of compression and shear wave velocities. The electrical resistivity is measured under various sub-zero temperatures to understand the effects of ice, which will further provide the valuable information about the location of the active layer. Furthermore, the evaluated physical properties can be used as basic data for the evaluation of the mechanical properties such as strength and stiffness.

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Shen, I. Y. "A Variational Formulation, a Work-Energy Relation and Damping Mechanisms of Active Constrained Layer Treatments." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0569.

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Abstract The purposes of this paper are to formulate active constrained layer (ACL) damping treatments through a variational approach, to study the work-energy relation of ACL, and to identify the damping mechanisms of ACL treatments. Application of extended Hamilton’s principle to ACL results in the equations of motion of ACL and the charge equation of electrostatics for the piezoelectric constraining layer. The work-energy equation together with the charge equation shows that the power dissipated through the active damping is the product of the electric field and the axial velocity of the piezoelectric constraining layer at the boundaries. This unique feature suggests that a self-sensing and actuating piezoelectric constraining layer may be an appropriate design in dissipating vibration energy without causing instability. To identify the damping mechanisms, a sensitivity analysis shows that the effectiveness of ACL damping primarily depends on the active and passive damping forces transmitted to the vibrating structure through the viscoelastic layer. The active damping force transmitted depends on the controller transfer function as well as a system parameter, termed active damping sensitivity factor, which is determined entirely by the dimensions and material properties of the passive constrained layer. Finally, numerical results on ACL beams are obtained to illustrate the theoretical predictions above.

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Pan, Tan, Rui Leng, Zoubeida Ounaies, and Mary Frecker. "Analytical Modeling of a Segmented Magneto-Active Elastomer Unimorph Actuator." In ASME 2021 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/smasis2021-67703.

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Abstract Magneto-active elastomers (MAE) are capable of achieving large deflections when actuated using an external magnetic field. Desired shape changes are achieved by judiciously designing a unimorph actuator comprised of an active MAE layer and a passive material substrate. In this paper, an analytical model is developed to predict the shape change of an MAE unimorph actuator that is segmented along its length. The shape change performance of a unimorph actuator consisting of polydimethylsiloxane (PDMS) embedded with barium hexaferrite (BHF) particles and a passive substrate of Scotch tape is investigated for different segmented geometric configurations. An Euler-Bernoulli model is developed to predict the free deflection and blocked force of the segmented unimorph given the geometric information, properties of the materials, and the external magnetic field strength. A numerical approach is also developed to account for consecutive segments and different conditions for each segment as the unimorph bends. The conditions include the spatial variation of the magnetic field and the dependence of actuation torque on the bending angle. The model is validated with experiments under the same conditions, and the outcomes show good agreement with the experimental results. The validated model is used in a parametric study to assess the effects of the geometric parameters, material properties, and the magnitude of the magnetic field on the shape change.

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Lee, J. Y., E. Lubarsky, and B. T. Zinn. "Suppression of Instabilities in Liquid Fueled Combustors by Variation of Fuel Spray Properties." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38169.

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This paper describes an experimental investigation of the feasibility of using “slow” active control approaches, which change liquid fuel spray properties, to suppress combustion instabilities. The objective of this control approach is to break up the feedback between the combustion process heat release oscillations and the combustor oscillations that drives the instability by changing the characteristics of the combustion process (i.e., characteristic combustion time). To demonstrate the feasibility of such control, this study used a proprietary fuel injector (Nanomiser™), which can independently vary its fuel spray properties, and investigated the dependence of acoustics-combustion process coupling, i.e., the driving of combustion instabilities, upon the fuel spray properties. The results of this study showed that by changing the spray characteristics it is possible to significantly damp combustion instabilities. Furthermore, using Abel’s deconvolution, this study showed that the instabilities were mostly driven in regions where the mean axial flow velocity was approximately zero, in the near field of the vortices that were generated in the combustor. The results of this study strongly suggest that a “slow” active control system that employs controllable injectors could be used to prevent the onset and/or damp detrimental combustion instabilities.

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Yan, Fengjun, and Junmin Wang. "Enabling Air-Path Systems for Homogeneous Charge Compression Ignition (HCCI) Engine Transient Control." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2506.

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This paper explores the possibility of using a cost-effective air-path system that includes a dual-loop (exhaust gas recirculation) EGR and a (variable geometry turbocharger) VGT to achieve independent control of the main in-cylinder charge conditions (i.e. in-cylinder oxygen, inert gas amounts, and gas temperature at the intake valve closing) for HCCI engine combustion transient operation. An engine simulation model consisting of the air-path system and a HCCI combustion model was developed and synthesized to evaluate the control authority of the air-path system on the in-cylinder charge conditions as well as their effects on combustion. A variety of simulations unveiled that such an air-path system can enable independent control of the main in-cylinder charge conditions and active compensation of the effects of the wall temperature variations on HCCI combustion.

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Ito, Satoru, and Yuji Suzuki. "High Speed Transient Temperature Profile Control Using Adjoint-Based Optimal Control Scheme." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44574.

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Optimal control scheme for transient temperature profile inside electronic devices such as pulsed laser diode is developed based on the adjoint equation of one-dimensional heat conduction. Joule heating with a thin-film heater is employed as the control input in order to minimize temperature changes of a thin active layer embedded in a modeled laser diode. In numerical simulations assuming the light-emitting time period of 1 μs, temperature variation of the active layer is successfully suppressed by 80% with the heat input prior to the onset of the laser pulse. It is found that the Fourier number of the layer between the control heater and the active layer is the key parameter to minimize the temperature fluctuations. We also successfully demonstrate suppression of the temperature change in a MEMS-based experimental setup.

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Liu, Xuan, Thomas A. Trabold, Jeffrey J. Gagliardo, David L. Jacobson, and Daniel S. Hussey. "Neutron Imaging of Water Accumulation in the Active Area and Channel-to-Manifold Transitions of a PEMFC." In ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 7th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fuelcell2013-18183.

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Management of liquid water formed by the electrochemical fuel cell reaction is a key factor in PEMFC performance and durability. For practical stack applications, an important consideration is the transport of liquid water at the transition between the ends of the bipolar plate channels and the manifolds, where excess reactant flows from all the individual cells are combined and directed to the stack exhaust. In this region, gas-phase momentum can be very low, especially on the anode, where there is little driving force to remove liquid water that may accumulate as a result of geometrical or surface energy variations, or due to relatively low temperatures that exist outside of the fuel cell active area. This study seeks to characterize the water accumulated within the active area and at the channel-to-manifold transition regions at both the anode and cathode outlets, as a function of cell operating temperature and current density. The neutron imaging method was applied to directly measure the water volumes within the transition regions, and provide a comparison to simultaneously measured water volume within the cell active area. Transition-region water was found to be weakly dependent on current density, suggesting that once water forms in this area, little driving force exists to extract it entirely by means of gas momentum. Moreover, it was found that the active area water volume is strongly dependent on cell temperature, and temperature variation of as little as 0.5 °C can produce a significant change in water accumulation which is reflected in the cell voltage.

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Звіти організацій з теми "Variation de charge active"

Ekdahl, Carl, Michael Jaworski, and David Moir. Beam Envelope Variation due to Space-Charge Neutralization. Office of Scientific and Technical Information (OSTI), January 2023. http://dx.doi.org/10.2172/1908459.

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Diprose, Rachael, Amalinda Savirani, Annisa Sabrina Hartoto, and Ken M. P. Setiawan. Pathways of Change through Women’s Collective Action: How Women are Overcoming Barriers and Bucking Trends to Influence Rural Development in Indonesia. University of Melbourne with Universitas Gadjah Mada and MAMPU, 2020. http://dx.doi.org/10.46580/124329.

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This overview to the edited volume is structured to briefly explore the following key points that emerge in the case analysis of how women’s collective action has created changes for both women’s well-being and the implementation of the Village Law, as well as how such change has been supported by a wide range of CSOs across different contexts and sectors. First, we identify variation in the diversity of priorities and initiatives that villages have introduced as a result of women’s influence on the implementation of the Law. Such initiatives go beyond infrastructure and economic development projects (although women have also prioritised these kinds of initiatives) and traverse multiple sectoral issues in seeking to address challenges for villagers, particularly women, through village development. Second, we identify the different types of changes that are evident in the case studies that have implications for women’s everyday wellbeing, as well as their influence on structures of power, decision making and village development at the individual and institutional levels, and in broader contexts. Third, we discuss how changes have come about for rural village women and what factors have contributed to the changes that are illustrated through the case studies. This includes a discussion of how context dynamics constrain or enable women’s influence, variation in core challenges (or sectoral issues) for women, and how collective action has contributed to forging these changes as is illustrated by the case studies. Fourth, we explore the temporal dimensions of change. And finally, we explore some of the pathways by which such changes have occurred in the research areas, that being different contexts.

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Doyle, Dennid D. Variation in Civilian Healthcare Utilization Amoung Active Duty Army Service Members in Germany. Fort Belvoir, VA: Defense Technical Information Center, February 1999. http://dx.doi.org/10.21236/ada420793.

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Fedewa, Andrew, Tom Stuecken, Edward Timm, Harold J. Schock, Tom-I. P. Shih, Manooch Koochesfahani, and Giles Brereton. Active flow control for maximizing performance of spark ignited stratified charge engines. Final report. Office of Scientific and Technical Information (OSTI), October 2002. http://dx.doi.org/10.2172/809083.

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Anil V. Virkar. Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects. Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/897546.

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Anil V. Virkar. ACTIVE CATHODES FOR SUPER-HIGH POWER DENSITY SOLID OXIDE FUEL CELLS THROUGH SPACE CHARGE EFFECTS. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/881719.

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Anil V. Virkar. ACTIVE CATHODES FOR SUPER-HIGH POWER DENSITY SOLID OXIDE FUEL CELLS THROUGH SPACE CHARGE EFFECTS. Office of Scientific and Technical Information (OSTI), March 2005. http://dx.doi.org/10.2172/881720.

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Anil V. Virkar. ACTIVE CATHODES FOR SUPER-HIGH POWER DENSITY SOLID OXIDE FUEL CELLS THROUGH SPACE CHARGE EFFECTS. Office of Scientific and Technical Information (OSTI), August 2005. http://dx.doi.org/10.2172/881721.

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