Thematische Bibliographien / Spreading device

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Auswahl der wissenschaftlichen Literatur zum Thema „Spreading device“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 7. Februar 2022

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Zeitschriftenartikel zum Thema "Spreading device"

Liu, Ye, Xin An Dang und Li Jun Yang. „Study of the Transmission System of Spreading Powder Device of Direct Metal Sintering Rapid Prototyping Machine“. Advanced Materials Research 591-593 (November 2012): 602–5. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.602.

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Direct metal sintering rapid prototyping mechanism is complex, including many kinds of transmission systems. Spreading powder device is important to direct metal sintering rapid prototyping mechanism. Based on grasping the working principle of the device, through the study of spreading powder device of direct metal rapid prototyping machine, grasp the process of spreading powder and the main structure of the device, and fabricate the simple model of the transmission system. In order to determine the necessary condition of how the spreading powder device functions, the dynamic parameters of the transmission system must be calculated, and the operation performance of the stepper motor must be checked. Then the precision and the processing quality of the finished part can be improved.

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Siddiqui, Ahmad Talha, Shoeb Ahad Siddiqui und Mohammad Ibrahim. „AFDroid: Anti-Forensics Device To Protect Android System“. INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 9, Nr. 3 (25.07.2013): 1134–38. http://dx.doi.org/10.24297/ijct.v9i3.3339.

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Mobile devices are among the most common new technologies of the year, gaining even more spread over and success in the day-to-day life of wide range of people. Unfortunately, while the number of mobile devices are used in crime activities is spreading and growing all over the world, the capability to perform the forensics analysis of such devices is limited both by technological and methodological problems. In this paper, we focus on anti forensics techniques applied to mobile device. Furthermore we observe the effectiveness of techniques.Â

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Asada, Satoshi, Jun Suda und Tsunenobu Kimoto. „Effects of Parasitic Region in SiC Bipolar Junction Transistors on Forced Current Gain“. Materials Science Forum 924 (Juni 2018): 629–32. http://dx.doi.org/10.4028/www.scientific.net/msf.924.629.

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Effects of a parasitic region in SiC BJTs on conductivity modulation and a forced current gain (βF) were investigated by using TCAD simulation with various device structures. By introducing an Al+-implanted region below the base parasitic region, βF can be improved because the implanted region can reduce the base spreading resistance, leading to alleviation of debiasing effect. βF in devices with various parasitic areas, whose base spreading resistances were reduced by the Al+-implantation, were compared. We found that βF can be enhanced by expanding the parasitic area if the base spreading resistance is sufficiently reduced. The higher βF is attributed to an expanded conductivity-modulated region. The collector current spreading in the collector layer and the hole injection from the parasitic region as well as from the intrinsic region can play a role to evoke the conductivity modulation. Thus, the larger parasitic region can expand the conductivity-modulated region, resulting in expansion of an active area and the enhancement of βF.

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Kwasny, Dorota, Olga Mednova, Indumathi Vedarethinam, Maria Dimaki, Asli Silahtaroglu, Zeynep Tümer, Kristoffer Almdal und Winnie Svendsen. „A Semi-Closed Device for Chromosome Spreading for Cytogenetic Analysis“. Micromachines 5, Nr. 2 (03.04.2014): 158–70. http://dx.doi.org/10.3390/mi5020158.

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Furukawa, Kazuaki, Hiroshi Nakashima, Yoshiaki Kashimura und Keiichi Torimitsu. „Microchannel device using self-spreading lipid bilayer as molecule carrier“. Lab on a Chip 6, Nr. 8 (2006): 1001. http://dx.doi.org/10.1039/b603568j.

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Ogunniyi, Aderinto, James Schrock, Miguel Hinojosa, Heather O’Brien, Aivars J. Lelis, Stephen Bayne und Sei Hyung Ryu. „Simulation Study of Switching-Dependent Device Parameters of High Voltage 4H-SiC GTOs“. Materials Science Forum 897 (Mai 2017): 575–78. http://dx.doi.org/10.4028/www.scientific.net/msf.897.575.

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The silicon carbide (SiC) “Super” gate turn-off thyristor (SGTO) is a viable device for high voltage and fast dI/dt switching applications. These devices are well suited for various pulsed power applications requiring high peak currents in the kilo-amp regime. The turn-on transition speed is determine by the spreading velocity, which depends on applied gate current, applied anode current density, minority carrier lifetime, and both the gate base-width and the drift region of the thyristor. The impact of device parameters on switching performance is discussed in this work.

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Elpelt, Rudolf, Bernd Zippelius, Stefan Doering und Uwe Winkler. „Employing Scanning Spreading Resistance Microscopy (SSRM) for Improving TCAD Simulation Accuracy of Silicon Carbide“. Materials Science Forum 897 (Mai 2017): 295–98. http://dx.doi.org/10.4028/www.scientific.net/msf.897.295.

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Computer-Aided-Design for the prediction of the technology process and the physical device properties (TCAD) is a key tool for the development and improvement of new device concepts as well as for the analysis and understanding of device properties and device behavior under application conditions. Apart from physical device models and parameters the precise process simulation of implanted doping profiles is mandatory for a sufficient prediction quality of the subsequent device simulations. In order to verify and improve the accuracy of process simulation, we employ the – for silicon carbide – relatively new method of Scanning Spreading Resistance Microscopy (SSRM) for the characterization of doping profiles.

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Singh, Manikant, Serge Karboyan, Michael J. Uren, Kean Boon Lee, Zaffar Zaidi, Peter A. Houston und Martin Kuball. „Lateral charge spreading and device-to-device coupling in C-doped AlGaN/GaN-on-Si wafers“. Microelectronics Reliability 95 (April 2019): 81–86. http://dx.doi.org/10.1016/j.microrel.2019.02.012.

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Edén, Ulla M., und Lauritz W. Olson. „A Simple and Safe Device for Spreading Ultrathin Sections with Chloroform“. Biotechnic & Histochemistry 68, Nr. 2 (Januar 1993): 65–66. http://dx.doi.org/10.3109/10520299309104668.

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Bandari, Anashe. „Sandwich device ensures rapid and even spreading of biofluids for analysis“. Scilight 2020, Nr. 34 (21.08.2020): 341106. http://dx.doi.org/10.1063/10.0001880.

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Dissertationen zum Thema "Spreading device"

Pacher, Ján. „Návrh konstrukce rozmetadla tuhých statkových hnojiv“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443173.

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The diploma thesis deals with the structural design of a solid manure spreader and the subsequent strength control of self-supporting construction. The introduction of the work consists of a research analysis of current design solutions of spreaders on the market with similar parameters as in the assignment. Subsequent chapters deal with the conceptual design of the spreader, preparation of the calculation model, suitable replacement of the components and evaluation of the strength analysis itself. The diploma thesis is accompanied by partial drawing documentation. The work was created in cooperation with ZDT Nové Veselí.

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Sampara, N. „Voltage induced spreading and liquid optical devices“. Thesis, Nottingham Trent University, 2013. http://irep.ntu.ac.uk/id/eprint/83/.

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An experimental investigation has been carried out into Liquid dielectrophoresis (LDEP), in which dielectric forces are used to actuate bulk liquid spreading and to imprint a deformation pattern at a liquid air surface. Our basic conguration uses a set of co-planar stripe interdigital electrodes to create a non-uniform A.C. electric field that exponentially decays in amplitude and penetrates above the structure into a dielectric liquid droplet. Dielectric forces drive a voltage-induced spreading of the droplet into a low contact angle droplet/film, an effect which will be referred to here as "dielectrowetting". Further application of the A.C. voltage to the electrodes results in a static sinusoidal wrinkle forming at the oil-air interface on the spread film. Three main areas of investigations are reported, the first of which is a study of the statics and dynamics of the voltage induced spreading of a stripe of the material 1,2 propylene glycol. In the limit of thick droplets, a theoretical prediction has been derived that the cosine of the static equilibrium contact angle is proportional to the square of the amplitude of the voltage applied to the inter-digital electrodes. This relationship is analogous to that found for electrowetting-on-dielectric (EWOD). Experimental observations confirm this predicted dielectrowetting behavior for the advancing static contact angle of the voltage induced spreading of a stripe of the material 1,2 propylene glycol. The predicted scaling relationship with the electrode dimensions has been confirmed for electrodes of linewidth 20 um, 40 um and 80 um. It is also shown that with an appropriate surface treatment the induced wetting is made reversible. The dynamic contact angle ( o) of the liquid droplet was also measured as a function of voltage during spreading and the results are found to agree with the predictions of the Hoffman-de-Gennes macroscopic viscous dissipation approach extended to account for the electric field. Three distinct regimes have been investigated experimentally and theoretically: partial wetting and exponential approach to equilibrium shape, spreading to complete wetting obeying a Tanner's law relationship, and super-spreading towards a complete wetting film. The second area is the fabrication of the solid phase transmission grating with a minimized zeroth order using LDEP and a UV curable liquid resin. A new electric-field assisted approach to fabricate solid diffractive optical devices is demonstrated in which the optical properties of the device can be tuned by adjusting the applied voltage whilst the optical medium is in its liquid phase. Continuous adjustment of the voltage, and hence the optical diffraction pattern, during UV curing can produce a solid grating with suppressed intensity of the transmitted zero order. The third area is a study of the dynamics of the formation of a periodic wrinkle deformation at the oil-air interface on a spread dielectric liquid film. An experimental study of how the switch on time ton and the switch off/relaxation time toff of the wrinkle scales as a function of the applied voltage V is presented. The amplitude A(V, t) of the wrinkle as a function of time was obtained from fitting the time dependent intensities of the positive zeroth, first and second diffracted orders of laser light transmitted through the oil film assuming that it acts as a thin sinusoidal phase grating. The results for relaxation have been compared with an analytical expression for toff that has been derived by considering the LaPlace pressure restoring force at the oil-air interface under a creeping flow approximation.

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Courte, Josquin. „Étude de la propagation prion-like de l'alpha-synucléine dans des réseaux de neurones reconstruits Reconstruction of directed neuronal networks in a microfluidic device with asymmetric microchannels Neurotoxicity of the Cyanotoxin BMAA Through Axonal Degeneration and Intercellular Spreading“. Thesis, Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=http://theses-intra.upmc.fr/modules/resources/download/theses/2019SORUS053.pdf.

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Les maladies neurodégénératives (telles que les maladies de Parkinson et d’Alzheimer) sont caractérisées par l’agrégation de protéines mal repliées en dépôts insolubles. Ces dépôts engendrent des dysfonctions cellulaires, et semblent donc avoir un rôle fondamental dans le développement de ces pathologies. L’apparition de ces dépôts se fait de façon stéréotypée dans des sous-groupes de patients. Notamment, dans la maladie de Parkinson, la petite protéine présynaptique alpha-synucléine (aSyn) est le composant principal d’agrégats dénommés corps de Lewy et neurites de Lewy. Les corps et neurites de Lewy apparaissent suivant un patron dénommé « staging de Braak » dans une sous-partie conséquente des patients. Dans une certaine mesure, le patron d’apparition des agrégats semblent suivre la connectivité neuro-anatomique entre les régions cérébrales, ce qui suggère que l’agrégation puisse se propager dans les réseaux neuronaux.L’étude des maladies prions telles que le kuru ou la maladie de Creutzfeldt-Jakob a mis en évidence un mécanisme original de propagation du mérepliement des protéines. La protéine PrP s’agrégeant dans ces pathologies est en effet capable d’adopter au moins deux conformations radicalement distinctes. L’une, pathologique, forme des agrégats, tandis que la forme fonctionnelle ne s’agrège pas. Par des mécanismes encore mal compris, mais qui potentiellement similaires à la formation de fibres amyloïdes, la protéine pathologique est en mesure de convertir la protéine fonctionnelle en sa forme anormale, et à l’inclure dans des agrégats. La forme anormale de la protéine est donc capable de s’auto-propager, et cela de cellule à cellule et d’organisme à organisme. De nombreuses similitudes dans les caractéristiques biochimiques et moléculaires des agrégats présents dans les maladies neurodégénératives non prions ont mené à l’hypothèse que l’agrégation protéique se fait suivant des modalités similaires aux maladies à prions. Suivant ce scénario, l’agrégation protéique est en mesure de se propager de neurone à neurone dans le cerveau via les connexions neuronales, et ainsi suivre un patron stéréotypé dépendant de l’interconnexion des régions successivement touchées. Cette hypothèse est dénommée « prion-like ».Cependant, les mécanismes expliquant la génération d’un patron stéréotypé de développement prion-like des agrégats d’aSyn restent obscurs. Le but de ma thèse a été d’aborder les déterminants de la propagation de l’agrégation de l’aSyn dans des réseaux de neurones hétérogènes grâce à des modèles in vitro. J’ai tout d’abord évalué si différentes régions du cerveau de souris mises en culture primaire présentaient la même vulnérabilité au recrutement de l’aSyn soluble dans des agrégats pathologiques introduits dans le milieu extracellulaire. J’ai pu mettre en évidence que la vulnérabilité de neurones striataux, corticaux et hippocampaux était fortement différente, et que le facteur déterminant cette vulnérabilité était le niveau d’expression endogène de l’aSyn. J’ai ensuite développé un système de culture permettant la reconstruction contrôlée de réseaux de neurones binaires in vitro, composés de neurones primaires murins, dont les connexions sont parfaitement orientées d’un compartiment vers l’autre, un prérequis pour l’étude de la propagation d’un agent pathogène auto-propagatif. Un tel système est parfaitement original, et n’avait jamais été publié auparavant. J’ai finalement modélisé la propagation prion-like de l’aSyn dans de tels réseaux, en y introduisant des agrégats exogènes d’aSyn fluorescents dans le compartiment « présynaptique » et en évaluant la propagation de l’agrégation au compartiment « postsynaptique ». Ce transfert ne peut se faire que via les connexions neuronales poussant depuis le compartiment présynaptique, les deux compartiments étant fluidiquement isolés. [...]
Neurodegenerative diseases such as Parkinsons’s or Alzheimer’s diseases are characterized by the aggregation of misfolded proteins in insoluble inclusions. These inclusions trigger cellular dysfnctions and are therefore thought to play an important role in the development of these pathologies. They appear following a conserved pattern in subgroups of patients. In Parkinson’s disease, the small presynaptic protein alpha-synuclein (aSyn) is the main component of protein deposits termed Lewy bodies and Lewy neurites. These appear following a stereotypical pattern known as “Braak staging” in a consequent subset of patients. The pattern of inclusion formation partly follows neuroanatomical connectivity, suggesting that protein aggregation propagates in neural networks. Prion diseases such as kuru or Creutzfeldt-Jakob’s disease have revealed an original mechanism for propagating protein misfolding. The PrP protein, aggregated in these diseases, is able to have two radically distinct conformations. The pathological one aggregates in supramolecular assemblies, while the functional one does not. Through an incompletely understood mechanism which might share similarities with the formation of amyloid fibrils, the pathological form of the protein is able to convert the functional form into the pathological one, recruiting it into aggregates. The abnormal form of the protein is thus able to self-propagate, from cell to cell and from organism to organism. Numerous biochemical and molecular characteristics of aggregates detected in neurodegenerative diseases are shared with the prion aggregates. It is thus hypothesized that protein aggregation in neurodegenerative diseases unfolds in a similar manner to prion aggregation. In this scenario, protein aggregation is able to be transmitted from neuron to neuron following neuroanatomical connectivity, and thus propagates in a stereotypical manner in neural networks following axonal tracts. This scenario is named “prion-like hypothesis”. However, how the prion-like propagation of aSyn generates the conserved pattern of aggregates in the brain of patients is still unknown. The aim of my PhD thesis has been to decipher parameters impacting the prion-like propagation of aSyn in heterogeneous neural networks with in vitro models. I first assessed if specific neuronal populations cultured from various regions of the mouse brain exhibited the same vulnerability to the prion-like recruitment of aSyn in pathological aggregates following their exposure to exogenous aSyn fibrils. I was able to demonstrate that cortical, striatal and hippocampal primary neuronal cultures had a significant difference in their vulnerability to prion-like seeding of aSyn aggregation. I also demonstrated that this vulnerability was due to the differential expression of aSyn in these populations. I then developed a culture system allowing for the controlled reconstruction of primary murine neurons networks. This system allows for the perfect filtration of axonal outgrowth in one direction, thus allowing the reconstruction of fully oriented binary networks. Axonal growth orientation is a prerequisite to the in vitro study of pathogens propagation in neural networks. This system is the first to achieve this level of axonal filtration while allowing synaptic connectivity between the two compartments. I finally modeled aSyn prion-like propagation in these reconstructed networks by selectively introducing exogenous fluorescent aSyn fibrils in the “presynaptic” compartment and following aggregation propagation to the “postsynaptic” compartment. This propagation can only occur through crossing axons, as the two compartments are fluidically isolated. I demonstrated that anterograde aSyn prion-like propagation was relatively inefficient in this experimental framework. Indeed, while a small quantity of exogenous fibrils are transferred to postsynaptic neurons, they are not able to seed endogenous aSyn aggregation in those. [...]

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Rossi, Stefano [Verfasser]. „Nanocrystalline diamond growth for top heat-spreading applications on GaN-based devices / Stefano Rossi“. Ulm : Universität Ulm. Fakultät für Ingenieurwissenschaften und Informatik, 2015. http://d-nb.info/1077559380/34.

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Moreno, Villavicencio Maiglid Andreina. „Development of 3D high-resolution imaging of complex devices by the correlation of ToF-SIMS and AFM“. Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI122.

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La miniaturisation continue et la complexité des dispositifs poussent les techniques existantes de nano-caractérisation à leurs limites. De ce fait, la combinaison de ces techniques apparait être une solution attrayante pour continuer à fournir une caractérisation précise et exacte. Dans le but de dépasser les verrous existants pour l’imagerie chimique 3D haute résolution à l’échelle nanométrique, nous avons concentré nos recherches sur la création d’un protocole combinant la spectrométrie de masse à ions secondaires de temps de vol (ToF-SIMS) avec la microscopie à force atomique (AFM). Ceci permet entre autre de corréler la composition et la visualisation en 3 dimensions avec des cartographies de topographie ou d’autres propriétés locales fournies par l’AFM. Trois principaux résultats sont obtenus grâce à cette méthodologie : la correction d’un ensemble de données ToF-SIMS pour une visualisation 3D sans artefacts, la cartographie du taux de pulvérisation locale permettant de mettre en évidence les effets liés à la rugosité et la présence d’interfaces verticales et la superposition des informations avancées ToF-SIMS et AFM. Quatre applications de la méthodologie combinée ToF-SIMS et AFM sont abordées dans cette thèse. La procédure de correction des données ToF-SIMS en 3D a été appliquée sur une structure hétérogène GaAs / SiO2. Les artefacts liés à la pulvérisation, notamment l’effet d’ombrage, ont été étudiés par le biais des cartographies de taux de pulvérisation sur des échantillons avec nano-motifs structurés et non structuré. Enfin, nous avons exploré la combinaison de l’analyse ToF-SIMS avec trois modes avancées de microscopie AFM : piézoélectrique (PFM), capacité (SCM) et conducteur (SSRM). Une première étude a notamment permis d’observer l’évolution et la modification chimique suite à l’application d’une contrainte électrique sur deux film mince piézoélectriques. Une deuxième étude s’est focalisée sur l’impact de l’implantation Ga lors de la préparation d’échantillons par FIB pour voir comment limiter l’effet de l’amorphisation sur la mesure électrique. Les aspects techniques de la méthodologie seront abordés pour chacune de ces applications et les perspectives de cette combinaison seront discutés
The continuous miniaturization and complexity of devices have pushed existing nano-characterization techniques to their limits. The correlation of techniques has then become an attractive solution to keep providing precise and accurate characterization. With the aim of overcoming the existing barriers for the 3D high-resolution imaging at the nanoscale, we have focused our research on creating a protocol to combine time-of-flight secondary ion mass spectrometry (ToF-SIMS) with atomic force microscopy (AFM). This combination permits the correlation of the composition in 3-dimensions with the maps of topography and other local properties provided by the AFM. Three main results are achieved through this methodology: a topography-corrected 3D ToF-SIMS data set, maps of local sputter rate where the effect of roughness and vertical interfaces are seen and overlays of the ToF-SIMS and AFM advanced information. The application fields of the ToF-SIMS and AFM combined methodology can be larger than expected. Indeed, four different applications are discussed in this thesis. The procedure to obtain the topography-corrected 3D data sets was applied on a GaAs / SiO2 patterned structure whose initial topography and composition with materials of different sputter rates create a distortion in the classical 3D chemical visualization. The protocol to generate sputter rate maps was used on samples with structured and non-structured nano-areas in order to study the possible ToF-SIMS sputtering artefacts, especially the geometric shadowing effect. Finally, we have explored the combination of ToF-SIMS analysis with three AFM advanced modes: piezoresponse force microcopy (PFM), scanning capacitance microscopy (SCM) and scanning spreading resistance microscopy (SSRM). Specifically, two main applications were studied: the chemical modification during electrical stress of a piezoelectic thin film and the recovery of initial electrical characteristics of a sample subjected to Ga implantation during FIB preparation. Technical aspects of the methodology will be discussed for each application and the perspectives of this combination will be given

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Pai-YangTsai und 蔡百揚. „Improvement of Thermal Management in GaN-based Light Emitting Diode Device and Package with Diamond-like Carbon Heat Spreading Layer“. Thesis, 2015. http://ndltd.ncl.edu.tw/handle/90494713260355970624.

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博士
國立成功大學
微電子工程研究所
104
In this dissertation, the high thermal conductivity and thermal diffusivity of diamond-like carbon (DLC) could reduce the heat crowding phenomenon in the epitaxy layer of light-emitting diodes (LEDs). The performance and reliability of LED devices were damaged or decreased owing to the heat crowding phenomenon, leading to high junction temperature and self-heating effect in the LEDs. At two or three times injection current, the junction temperature of LEDs with DLC heat-spreading layer was decreased more than 5 °C. The relative light intensity was increased by approximately 5% to 10%. The surface temperature distribution of LED with DLC heat-spreading layer was more uniform than that of LED without DLC heat-spreading layer. The thermal diffusivity of Al metal-core printed circuit board (PCB) was increased by using DLC as heat-spreading and insulating layer. Metal core PCB substrate limits thermal dissipation because of the low thermal conductivity of the insulating layer between the Cu circuit and Al substrate. Therefore, heat was crowded under the LED device area and not spread all over the Al substrate area. The DLC heat-spreading layer improved the low thermal conductivity with regular metal core PCB. For the measurement of light intensity droop at the thermal equilibrium, the light intensity of metal core PCB with DLC heat-spreading layer was improved by approximately 7%. The junction temperature was decreased by more than 10 °C. The relative light intensity was improved by 3% after turn-on of 1,000 h. In addition to the heat dissipation capability of LED device and package material, the thermal effect of phosphor material is important in the LED package. The remote phosphor was directly attached to the metal-core printed circuit board (MCPCB), and then the phosphor layer and blue LED chip were separated by air. Therefore, the heat of the blue LED chip was indirectly conducted to the phosphor layer. At high injection current, the light intensity of remote phosphor type was not saturated and droop phenomenon was observed. For the correlated color temperature shift, the remote phosphor type was lower than the conventional phosphor coating technology. The former type can be designed with different shapes for different light pattern applications. This dissertation demonstrated the high efficiency and reliability of white LED light source for the solid-state lighting. This light source is composed of remote phosphor, LEDs, and Al MCPCB with DLC heat-spreading layer.

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Sheu, Gwo-jiun, und 許國君. „Electrical Simulation and Current Spreading Analysis in the GaN-based Light-Emitting Diode Devices“. Thesis, 2008. http://ndltd.ncl.edu.tw/handle/22130818217450274401.

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博士
國立中央大學
機械工程研究所
97
When the chip size of light emitting diodes (LEDs) and the input power become larger, current spreading in the active layer will obviously affect the optical, electrical, and thermal packaging performances of the LED chip. To further understand the current spreading behavior in the active layer, we use a three-dimensional numerical simulation to analyze the electrical characteristic and current distribution of a GaN LEDs device. The results and trends found could serve as useful references for researchers focusing on the design of an LED chip. Employing two-dimensional analysis, in lateral configuration LEDs, the current flows vertically in the p-GaN and active layers, and horizontally in the spreading and n-GaN layers. Therefore, that the current crowding in the active layer would be generated at p- or n-electrodes is mainly dependent on the effect of resistance match between the spreading and n-GaN layers. In addition, the current distribution in the active layer can also obviously affect light extraction efficiency (LEE) and driving voltage. Using three-dimensional analysis, for real cases of side-view LEDs, the driving voltage for the well-designed p- and n-electrode patterns considered in our study can be markedly reduced to around 0.45 V, which corresponds to about 13% decrease in magnitude. The influence of the change in p-electrode pattern on current spreading and voltage drop is more significant than that made by altering the n-electrode pattern for this type of LED. On the other hand, the vertical LEDs with a current blocking layer are also analyzed, it shows that thermal effect in the LED chip should be taken into account and is more obvious in such cases.

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Bücher zum Thema "Spreading device"

Fatemi, Navid S. Lateral spreading of Au contacts on InP. [Washington, D.C.]: NASA, 1990.

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Fatemi, Navid S. Lateral spreading of Au contacts on InP. [Washington, D.C.]: NASA, 1990.

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Buchteile zum Thema "Spreading device"

Flanz, Jay. „Beam Spreading Devices“. In Ion Beam Therapy, 417–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21414-1_25.

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Orlowski, Marius, und William J. Taylor. „New Spreading Resistance Effect For Sub-0.50 µm MOSFETs: Model and Simulation“. In Simulation of Semiconductor Devices and Processes, 159–62. Vienna: Springer Vienna, 1995. http://dx.doi.org/10.1007/978-3-7091-6619-2_37.

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Jain, Deepti, Kamal Lohani, S. K. Mehta, Subodh Chandra, Pramod Kumar, Abhishek Sharma, Deepak Mohanty, Alok Jain und Satish Mohan. „Influence of Lateral Current Spreading on the Characteristics of High Fill Factor Mesa-Stripe Laser Diode Arrays“. In Physics of Semiconductor Devices, 791–94. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03002-9_203.

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P. K., Rajani, Neha Motagi, Komal Nair und Rupali Narayankar. „Autonomous Smart Device for COVID-19 Detection Using Artificial Intelligence“. In Advances in Healthcare Information Systems and Administration, 128–47. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-7709-7.ch008.

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Corona is a pandemic disease and is spreading all over the world. There is also lack of corona virus detection machines. If it is detected at very early stages without pathological intervention, then further spreading of the disease can be controlled, and many of human lives can be saved. So, the proposed biomedical device can be used for fast and accurate prediction of COVID-19 from chest x-rays. X-ray can also be taken from anywhere and sent through any communication medium. Even if error is added, it can be removed using error concealment algorithms. Automated AI-based systems will be used for prediction of normal, COVID-19, and pneumonic cases from x-ray images. It makes detection of COVID-19 infection less costly and portable. This device can be stored in less stringent conditions, making it more effective.

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Corradi, Antonio, Mario Fanelli und Luca Foschini. „Towards Adaptive and Scalable Context Aware Middleware“. In Technological Innovations in Adaptive and Dependable Systems, 21–37. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0255-7.ch002.

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The diffusion of portable client devices is promoting the spreading of novel mobile services, both traditional such as email and printing, and new such as social computing applications, capable of opportunistically exploiting any computing resource and any wireless connectivity encountered by roaming users. The new requirements call for novel context-aware middlewares to support and simplify the retrieval and the usage of context data. However, existing context data dissemination infrastructures still present several limitations: they are unable to adaptively exploit impromptu any wireless communication opportunity; they are unable to scale, especially in wide/densely populated environments; and they are prone to connection/device flaws. The article proposes a novel context-aware middleware that achieves adaptability, scalability, and dependability in context data dissemination through three main core guidelines: by using a distributed hierarchical architecture, by employing lightweight and adaptive context data dissemination solutions, and by adopting statistical context data/query replication techniques. The performance results, obtained by extensively testing the proposed solution in our wireless university campus testbed, have validated our design choices.

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Fuji, Kei, und Fujio Yoshida. „Mobile Phone-Related Behaviors and Problems in Japan“. In Encyclopedia of Mobile Phone Behavior, 1079–88. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8239-9.ch088.

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In Japan, the use of mobile devices has been spreading rapidly and continues to grow. However, this causes many problems that no one predicted. This article describes the use of mobile devices as well as issues related to their use in Japan. The authors will discuss these issues regarding the three aspects of “sharing of information and emotions in emergent disasters,” “addictive use of mobile devices,” and “cyberbullying in young people,” and will introduce representative psychological researches in Japan. At the end of this article, the actions and directions necessary to address these issues will be discussed.

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Swami, Deb Sunder, und Kandarpa Kumar Sarma. „A logistic-Map-Based PN Sequence for Stochastic Wireless Channels“. In Advances in Wireless Technologies and Telecommunication, 155–81. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2342-0.ch008.

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The work in this chapter mainly focusses on a pseudo-noise (PN) sequence generator which is constructed exploiting the features of one-dimensional chaotic systems such as a logistic map. The use of logistic map to generate strong cryptographic sequences is novel in approach in terms of its use with a range of transmission techniques for wireless communication because it is easy to conceive and requires simple devices to generate the sequence. The generated sequence is used as a spreading sequence in a DS-SS modulation multipath environment with AWGN and Rayleigh fading channel, under various channel fading conditions. The BER curves and channel impulse responses are obtained and compared with the existing linear feedback shift register (LFSR) based PN sequence and Kasami sequence. Results from this comparative analysis indicate that the proposed method generally yields a greater number of reliable, unpredictable and random bits than existing techniques under the same conditions and can be practically implemented for DS-SS scheme as a spreading sequence.

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Mandelli, Elisa. „The Multi-media Museum: The 1960s–70s“. In The Museum as a Cinematic Space, 61–70. Edinburgh University Press, 2019. http://dx.doi.org/10.3366/edinburgh/9781474416795.003.0005.

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This chapter discusses the spreading of film projections and other multi-media and interactive devices in museum galleries in the 1960s–70s, due to the advent of video and technological innovations that rendered these machines more easily available, as well as to the growing importance accorded to the visual design of exhibitions. The chapter also focuses on the curatorial debate about several key issues. It addresses the relationships between museums and their visitors, and the role of multi-media in shaping their interactions. The chapter analyses a seminar held in 1967 by Marshal McLuhan and Harley Parker. In this meeting with museum professionals, the famous communication theorist discussed emerging trends in the communication strategies of museums, which included the role of audio-visual and multi-media devices.

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Ahmadinia, Ali, und Ahmed Saeed. „Secure Embedded Systems“. In Cyber-Physical Systems for Next-Generation Networks, 207–21. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5510-0.ch010.

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As computing devices have become an almost integral part of our lives, security of systems and protection of the sensitive data are emerging as very important issues. This is particularly evident for embedded systems which are often deployed in unprotected environments and at the same time being constrained by limited resources. Security and trust have also become important considerations in the design of virtually all modern embedded systems as they are utilized in critical and sensitive applications such as in transportation, national infrastructure, military equipment, banking systems, and medical devices. The increase in software content and network connectivity has made them vulnerable to fast spreading software-based attacks such as viruses and worms, which were hitherto primarily the concern of personal computers, servers, and the internet. This chapter discusses the basic concepts, security attacks types, and existing preventive measures in the field of embedded systems and multi-core systems.

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Ilter, A. Tolga, und Pelin Karacar. „Mobile Technology and Social Media Literacy“. In Advances in Media, Entertainment, and the Arts, 180–96. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1534-1.ch010.

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Advancing information and communication technologies (ICT) are reshaping our daily lives. Mobile communication devices, especially the introduction of smartphones, changed the way we communicate both professionally and socially. Mobile technologies are spreading our daily lives with the help of social media applications. Implementation of social networks to the education programs may encourage students to reach information, share their work, get feedback more easily, and produce content that will build up their portfolios and professional identities for their future career. However, in order to achieve such a goal, it is quite important to understand their behavioural patterns on social networks and mobile technology use. In this context, this research tries to explore architecture and interior architecture students' social network patterns under the social media literacy framework.

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Konferenzberichte zum Thema "Spreading device"

Chen, Tron-Min, Shui-Jinn Wang, Kai-Ming Uang, Shiue-Lung Chen, Ching-Chung Tsai, Hon-Yi Kou, Wei-Chi Lee und Hon Kuan. „High Power Vertical-structure GaN-based LEDs with Improved Current Spreading and Blocking Designs“. In 65th Device Research Conference. IEEE, 2007. http://dx.doi.org/10.1109/drc.2007.4373661.

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Ibe, Eishi, Sung Chung, Shijie Wen, Hironaru Yamaguchi, Yasuo Yahagi, Hideaki Kameyama, Shigehisa Yamamoto und Takashi Akioka. „Spreading Diversity in Multi-cell Neutron-Induced Upsets with Device Scaling“. In IEEE Custom Integrated Circuits Conference 2006. IEEE, 2006. http://dx.doi.org/10.1109/cicc.2006.321010.

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Tadjer, M. J., T. J. Anderson, K. D. Hobart, T. I. Feygelson, M. A. Mastro, J. D. Caldwell, J. K. Hite et al. „Reduced self-heating in ALGaN/GaN HEMTs using nanocrystalline diamond heat spreading films“. In 2010 68th Annual Device Research Conference (DRC). IEEE, 2010. http://dx.doi.org/10.1109/drc.2010.5551873.

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„The Role of Media Device in Spreading the Legal Culture in Society“. In March 13-15, 2017 Dubai (UAE). HEAIG, 2017. http://dx.doi.org/10.15242/heaig/iah0317531.

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Chuiko, Myroslava, Oleksandr Krynytskyi und Lidiia Vytvytska. „MEASURING DEVICE FOR CONTROL THE SPREADING DEGREE OF LIQUIDS ON SOLID SURFACE“. In RICERCHE SCIENTIFICHE E METODI DELLA LORO REALIZZAZIONE: ESPERIENZA MONDIALE E REALTÀ DOMESTICHE. European Scientific Platform, 2021. http://dx.doi.org/10.36074/logos-14.05.2021.v1.33.

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Zhang, Li, Mingrui Yu, Qiang Guo, Yiming Zhu, Yidan Yuan und Weimin Ma. „Conceptual Design of an Ex-Vessel Melt Cooling Device“. In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67190.

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A helical ex-vessel cooling device is being designed and evaluated to insure retention of the molten corium that may discharge from the failed lower head of a reactor pressure vessel (RPV) during postulated severe accidents of a light water reactor. This conceptual design consists of four functional parts located in the reactor cavity, including an intermediate chamber for temporary retention of corium, an helical channel for corium spreading, cooling pipes embedded in the channel wall and venting system. The heat flux profile and steam generation along the cross section of the spreading channel T are analyzed under several conservative assumptions. The results show the melt coolability is achievable even under Benrenson film boiling regime.

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Nazir, Aftab, Pierre Eyben, Trudo Clarysse, Geert Hellings, Andreas Schulze, Jay Mody, Kristin De Meyer und Wilfried Vandervorst. „Understanding device performance by incorporating 2D-carrier profiles from high resolution scanning spreading resistance microscopy into device simulations“. In ESSDERC 2011 - 41st European Solid State Device Research Conference. IEEE, 2011. http://dx.doi.org/10.1109/essderc.2011.6044216.

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La Spina, L., L. K. Nanver, H. Schellevis, E. Iborra, M. Clement und J. Olivares. „Characterization of PVD aluminum nitride for heat spreading in RF IC's“. In ESSDERC 2007 - 37th European Solid State Device Research Conference. IEEE, 2007. http://dx.doi.org/10.1109/essderc.2007.4430951.

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Kai-Shing Yang, Yu-Lieh Wu, Ing-Young Chen und Chi-Chuan Wang. „An investigation of thermal spreading device with thermal via in high power LEDs“. In 2009 4th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT). IEEE, 2009. http://dx.doi.org/10.1109/impact.2009.5382141.

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Anderson, T. J., J. E. Butler, B. B. Pate, M. J. Tadjer, K. D. Hobart, T. I. Feygelson, J. D. Caldwell et al. „Temperature profiling in AlGaN/GaN HEMTs with nanocrystalline diamond heat spreading layers by Raman spectroscopy“. In 2011 International Semiconductor Device Research Symposium (ISDRS 2011). IEEE, 2011. http://dx.doi.org/10.1109/isdrs.2011.6135264.

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