4081   émission Induite Dans les Semiconducteurs émission Induite Dans les Semiconducteurs Georges Duraffourg    1965 On adapte la condition de taux net d’émission induite (inversion de populations) au cas des transitions entre bande de conduction et bande de valence d’ un semiconducteur. Cette condition s’écrit en termes de quasiniveau de Fermi (ou quasipotentiel chimique) des électrons de chacune des bandes; elle n’est autre qu’ une expression du deuxième principe de la thermodynamique. L’introduction, justifiée, des quasipotentiels chi... 查看全文

4082   A new method of solving Bessel's differential equation using the [script. L] 2-transform A new method of solving Bessel's differential equation using the [script. L] 2-transform    2002 In the present paper, a new method of solving Bessel's differential equation is given using the [script. L] 2-transform. © 2002 Elsevier Science Inc. All rights reserved. 查看全文

4083   Étude de la propagation aléatoire dans les fibres optiques résolution directe des équations de propagation Étude de la propagation aléatoire dans les fibres optiques résolution directe des équations de propagation Hubert Debart    1975 Dans cet article, on étudie le premier aspect de la propagation aléatoire dans les fibres optiques, c’estàdire la répartition de la puissance entre les modes guidés transmis par ta fibre et son évolution au cours de la propagation. Pour relier directement le comportement de la fibre à la nature géométrique et statistique de ses défauts, on écrit des équations de propagation qu’on résout par itération, comme les équations de perturbation... 查看全文

4084   Étude d’un système simplifié de signalisation par canal sémaphore Étude d’un système simplifié de signalisation par canal sémaphore Pierre Lucas    1970 L’apparition des systèmes de commutation téléphonique modernes (électroniques ou semiélectroniques) dont la commande est assurée par des calculateurs à programme enregistré, ouvre des possibilités nouvelles à la fonction de signalisation entre les autocommutateurs. Dans un réseau où les calculateurs de commande vont se multiplier, il est intéressant d’envisager une signalisation par échange direct sur des voies spécialisées ap... 查看全文

4085   Transvesicular reactions of thiols with Ellman's reagent Transvesicular reactions of thiols with Ellman's reagent Robert A. Moss, Shanti Swarup    1988 查看全文

4086   Hojman's theorem of the third-order ordinary differential equation Hojman's theorem of the third-order ordinary differential equation    2009 This paper extends Hojman's conservation law to the third-order differential equation. A new conserved quantity is constructed based on the Lie group of transformation generators of the equations of motion. The generators contain variations of the time and generalized coordinates. Two independent non-trivial conserved quantities of the third-order ordinary differential equation are obtained. A simple example is presented to illustrate the applications of the results. © 2009 Chin. Phys. Soc.... 查看全文

4087   Étude par Microscopie et Diffraction Électronique de Plaquettes de Silicium Diffusées au Phosphore Étude par Microscopie et Diffraction Électronique de Plaquettes de Silicium Diffusées au Phosphore Jean Devaux;Pierre Henoc    1970 L’étude des semiconducteurs fortement dopés des microcircuits HF fait intervenir la diffusion solide-solide; l’auteur a été ainsi amené à étudier, au microscope électronique, l’évolution des couches de silice dopées et déposées par cracking, sur des supports monocristallins de silicium, ainsi que la nature des défauts créés dans le substrat au cours du cycle thermique que nécessite la diffusion du dopant dans le semicond... 查看全文

4088   Two steps forward—one step back: Advances in affinity purification mass spectrometry of macromolecular complexes Two steps forward—one step back: Advances in affinity purification mass spectrometry of macromolecular complexes    0 Cellular functions are defined by the dynamic interactions of proteins within macromolecular networks. Deciphering these complex interplays is the key to getting a comprehensive picture of cellular behavior. and to understanding biological systems, from a simple bacterial cell to highly regulated neuronal cells or cancerous tissue. In the last decade, affinity purification (AP) coupled to mass spectrometry has emerged as a powerful tool to comprehensively study interaction networks and their mac... 查看全文

4089   Évolution du réseau de télécommunication français Évolution du réseau de télécommunication français Patrice Collet    1987 查看全文

4090   Calorimetric Measurement of Phospholipid Interaction with Methyl-β-Cyclodextrin† Calorimetric Measurement of Phospholipid Interaction with Methyl-β-Cyclodextrin† Thomas G. Anderson,* Anmin Tan, Peter Ganz, and Joachim Seelig    2004 Cyclodextrins are able to bind hydrophobic molecules in their interior cavity and as such have received a great deal of attention as carriers of cholesterol, lipophilic drugs, and other sparingly soluble compounds. Despite the importance of these biochemical applications, relatively little is known about the interactions of cyclodextrins with phospholipid membranes. Here we characterize the binding of randomly methylated β-cyclodextrin (mβCD) to 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine... 查看全文

4091   The sclerotic line: Why it appears under knee replacements (a study based on the Oxford Knee) The sclerotic line: Why it appears under knee replacements (a study based on the Oxford Knee)    2010 Background: Radiolucent lines and sclerotic margins are often seen on knee radiographs taken a year or longer after knee replacement surgery. Histology has shown that the radiolucent zone is predominantly fibrocartilage and the sclerotic margin is lamellar bone. The reasons for their existence are not clearly understood. Methods: A three-dimensional finite element model of the medial half of the proximal 75 mm of a tibia implanted with a knee replacement was created and run over 365 iterations s... 查看全文

4092   New exact solutions of the Einstein vacuum equations for rotating axially symmetric fields New exact solutions of the Einstein vacuum equations for rotating axially symmetric fields    2009 The isovector fields of the Einstein vacuum equations for stationary axially symmetric rotating fields, in the general form, are derived using the geometric prolongation technique. More specifically, this technique yields invariant transformations that reduce the given system of partial differential equations (PDEs) to a system of nonlinear ordinary differential equations (ODEs). Some symmetry transformations and new exact solutions of the Einstein vacuum equations are obtained. © 2009 The ... 查看全文

4093   Proceedings of the 3 rd Australian Security and Intelligence Conference National Security: A Propositional Study to Develop Resilience Indicators as an Aid to Personnel Vetting Proceedings of the 3 rd Australian Security and Intelligence Conference National Security: A Propositional Study to Develop Resilience Indicators as an Aid to Personnel Vetting David Brooks, Jeff Corkill, Julie-ann Pooley, Lynne Cohen, Cath Ferguson, Craig Harms    0 Within the National Security domain there is a convergence of security responsibility across the national security agencies, law enforcement and private security sectors. The sensitivity of this environment requires individuals operating in the domain to be honest, trustworthy and loyal. Personnel vetting is a formal process used to determine an individual’s suitability for access to this domain. Notwithstanding this process, significant breaches of trust, security, and corruption still occur. I 查看全文

4094   On the solutions of time-fractional reaction-diffusion equations On the solutions of time-fractional reaction-diffusion equations    2010 In this paper, a new application of generalized differential transform. method (GDTM) has been used for solving time-fractional reaction-diffusion equations. To illustrate the reliability of the method, some examples are provided. Crown Copyright © 2010. 查看全文

4095   Constraint Qualifications for Convex Inequality Systems with Applications in Constrained Optimization Constraint Qualifications for Convex Inequality Systems with Applications in Constrained Optimization Chong Li;K. F. Ng;T. K. Pong    0 For an inequality system defined by an infinite family of proper convex functions, we introduce some new notions of constraint qualifications in terms of the epigraphs of the conjugates of these functions and study relationships between these new constraint qualifications and other well-known constraint qualifications including the basic constraint qualification studied by Hiriart-Urrutty and Lemarechal and by Li, Nahak, and Singer. Extensions of known results to more general settings are presen... 查看全文

4096   Short communications: Fast method to compute the scalar product of gradient and given vector Short communications: Fast method to compute the scalar product of gradient and given vector    1989 The paper deals with a special problem in Automatic Differentiation. Let f be a rational function of n variables, let #(f) denote the number of operations to evaluate f(x), let g denote the gradient of f. Many algorithms for minimizing f(x) require the scalar product g(u)tv. In the standard method for computing g(u)tv the amount of work grows with the product of n and #(f). In this note a new method for computing g(u)tv is presented. The new method is considerably faster; its amount of work only... 查看全文

4097   Basistechnologien und Standards des Mobile Business Basistechnologien und Standards des Mobile Business Markus Herzig    2001 查看全文

4098   On the potential of combined ARFI and elastography to improve differentiation of material structure in viscoelastic tissue On the potential of combined ARFI and elastography to improve differentiation of material structure in viscoelastic tissue    2007 Acoustic radiation force imaging methods distinguish tissue structure and composition by monitoring tissue responses to applied radiation force excitations. Applying Voigt and Kelvin viscoelastic tissue models, we present a new radiation force technique - monitored steady-state excitation and recovery (MSSER) imaging - that tracks both steady-state displacement during prolonged force application and transient response following force cessation to estimate tissue mechanical properties such as ela... 查看全文

4099   Michael Cusumano Michael Cusumano Michael A. Cusumano    2000 查看全文

4100   Modelling of Population Migration to Reproduce Rank-Size Distribution of Cities in Japan Modelling of Population Migration to Reproduce Rank-Size Distribution of Cities in Japan Hiroto Kuninaka;Mitsugu Matsushita    0 We investigate the rank-size distribution of cities in Japan by data analysis and computer simulation. From our previous data analysis of the census data after World War II, it has been clarified that the power exponent of the rank-size distribution of cities changes with time and Zipf’s law holds only for a restricted period. We show that Zipf’s law broke down owing to the great mergers and recovered by investigating the time evolution of the rank-size distri... 查看全文

4101   On the numbers of periodic and almost periodic solutions of first order ordinary differential equations On the numbers of periodic and almost periodic solutions of first order ordinary differential equations    1991 The number of periodic and almost periodic solutions of the first-order ordinary differential equation are considered. The right-hand side of the differential equation is supposed to be periodic and continuous. Both well-known results and new theorems concerning the connection between the number of periodic solutions and the behaviour of solutions of special functional equation are stated. 查看全文

4102   The Zero-Information-Limit Condition and Spurious Inference in Weakly Identified Models The Zero-Information-Limit Condition and Spurious Inference in Weakly Identified Models Charles R. Nelson, Richard Startz    2006 In many econometric models the asymptotic variance of a parameter estimate depends on the value of another structural parameter in such a way that the data contain little information about the former when the latter is close to a critical value. This paper introduces the Zero-Information-Limit-Condition (ZILC) to identify such models where ‘weak identification’ leads to spurious inference. We find that standard errors tend to be underestimated in these cases, but the size of the asymptotic t-tes 查看全文

4103   5.1 The Conditional Gauss Markov Theorem 5.1 The Conditional Gauss Markov Theorem Unknown Authors    0 This chapter explains asymptotic theory for linear models in the form. that is convenient for most applications of structural econometrics for linear time series models. In many applications of rational expectations models, stringent distributional assumptions, such as an assumption that the disturbances are normally distributed, are unattractive. Without such assumptions, however, it is not possible to obtain the exact distributions of estimators in finite samples. For this reason, asymptotic t 查看全文

4104   On the support of multimedia traffic over optical burst-switched networks On the support of multimedia traffic over optical burst-switched networks    2006 Optical Burst Switching (OBS) is a promising switching paradigm that is very suitable to be deployed in the next generation internet. OBS combines the benefits of various evolving techniques to economize the network traffic through an optical network. However, OBS lacks mechanisms for congestion control and service differentiation, which impedes its support for the Internet multimedia traffic. In this study, new congestion control and service differentiation mechanisms are presented. These mecha... 查看全文

4105   A high-resolution survey of diffuse interstellar bands A high-resolution survey of diffuse interstellar bands Carsten Gerner-Beuerle    2012 This paper presents an atlas of diffuse interstellar bands together with tables with measurements of their parameters: central wavelengths, full widths at half-maximum and equivalent widths. For this goal the spectra of ten reddened, early-type stars have been selected. The spectra are of high resolution, ∼100 000, and reasonable signal-to-noise ratio, S/N > 300; they cover a wide spectral range 3500–10 000 Å and show a lack of evident Doppler splitting in the i... 查看全文

4106   The new wave of displays The new wave of displays    2004 The development of new line of kitchen appliances by Electrolux Home products North America for all phase of operation including self-cleaning is discussed. The designer wanted the line to include oven with several cutting edge features mainly glass panel and user interface upon which graphics would remain invisible until summoned with the touch of a hand. The strategies such as lean manufacturing and supply base differentiation, enables the producers to reduce the cost and maintain the health a... 查看全文

4107   The generalization of the generalized Al-Oboudi differential operator The generalization of the generalized Al-Oboudi differential operator    2009 In this paper, firstly we define the generalization of the generalized Al-Oboudi differential operator. Then we also define new classes of analytic and p-valently starlike and convex functions with complex order by means of this new general differential operator. Our main purpose is to determine coefficient bounds for functions in certain subclasses of this classes, which are introduced here by means of a family of nonhomogeneous Cauchy-Euler differential equations. Relevant connections of some ... 查看全文

4108   A transient-improved low-dropout regulator with nested flipped voltage follower structure A transient-improved low-dropout regulator with nested flipped voltage follower structure Carsten Gerner-Beuerle    2012 In this article, the existing low-dropout regulator (LDO) based on cascoded flipped voltage follower (CAFVF) is reviewed. A new method to simulate the open-loop gain of an LDO with a CAFVF structure is conveyed. The drawback of CAFVF-based LDO is that the nondominant pole locates at low-frequency and pole-zero cancellation using a large equivalent series resistance of loading capacitor is required for stability. To tackle this problem, a novel LDO structure based on a nested CAFVF is proposed an... 查看全文

4109   17 Evolutionary Methods for Learning Bayesian Network Structures 17 Evolutionary Methods for Learning Bayesian Network Structures Thierry Brouard, Alain Delaplace, Hubert Cardot    0 Bayesian networks (BN) are a family of probabilistic graphical models representing a joint distribution for a set of random variables. Conditional dependencies between these variables are symbolized by a Directed Acyclic Graph (DAG). Two classical approaches are often encountered when automaticaly determining an appropriate graphical structure from 查看全文

4110   FURTHER APPLICATIONS OF THE NON-STATIONARY OPERATIONAL CALCULUS TO THE SYNTHESIS OF CLOSED-LOOP DISTRIBUTED SYSTEMS. A NEW APPROACH TO DISTRIBUTED WHITE NOISE. FURTHER APPLICATIONS OF THE NON-STATIONARY OPERATIONAL CALCULUS TO THE SYNTHESIS OF CLOSED-LOOP DISTRIBUTED SYSTEMS. A NEW APPROACH TO DISTRIBUTED WHITE NOISE.    1977 By using a differential polynomial algebra one can obtain a new definition for the distributed transfer functions of distributed systems which apply even when these latter are governed by partial differential equations with space-varying coefficients. Further extensions of this approach are considered here. After a brief background on previous results by the author and the statement of new theoretical complements, time sampled-data distributed systems are examined and their digital compensation ... 查看全文

上一页  [159]  [160]  [161]  [162]  [163]  [164]  [165]  [166]  [167]  [168]  [169]  [170]  [171]  [172]  [173]  [174]  [175]  [176]  [177]  [178]  [179]  [180]  [181]  [182]  [183]  [184]  [185]  [186]  [187]  [188]  [189]  [190]  [191]  [192]  [193]  [194]  [195]  [196]  [197]  [198]  [199]  [200]  [201]  [202]  [203]  [204]  [205]  [206]  [207]  [208]  [209]  [210]  [211]  [212]  [213]  [214]  [215]  [216]  [217]  [218]  [219]  [220]  [221]  [222]  [223]  [224]  [225]  [226]  [227]  [228]  [229]  [230]  [231]  [232]  [233]  [234]  [235]  [236]  [237]  [238]  [239]  [240]  [241]  [242]  [243]  [244]  [245]  [246]  [247]  [248]  [249]  [250]  [251]  [252]  [253]  [254]  [255]  [256]  [257]  [258]  [259]  [260]  [261]  [262]  [263]  [264]  [265]  [266]  [267]  [268]  [269]  [270]  [271]  [272]  [273]  [274]  [275]  [276]  [277]  [278]  [279]  [280]  [281]  [282]  [283]  [284]  [285]  [286]  [287]  [288]  [289]  [290]  [291]  [292]  [293]  [294]  [295]  [296]  [297]  [298]  [299]  [300]  [301]  [302]  [303]  [304]  [305]  [306]  [307]  [308]  [309]  [310]  [311]  [312]  [313]  [314]  [315]  [316]  [317]  [318]  [319]  [320]  [321]  [322]  [323]  [324]  [325]  [326]  [327]  [328]  [329]  [330]  [331]  [332]  [333]  [334]  [335]  [336]  [337]  [338]  [339]  [340]  [341]  [342]  [343]  [344]  [345]  [346]  [347]  [348]  [349]  [350]  [351]  [352]  [353]  [354]  [355]  [356]  [357]  [358]  [359]  [360]  [361]  [362]  [363]  [364]  [365]  [366]  [367]  [368]  [369]  [370]  [371]  [372]  [373]  [374]  [375]  [376]  [377]  [378]  [379]  [380]  [381]  [382]  [383]  [384]  [385]  [386]  [387]  [388]  [389]  [390]  [391]  [392]  [393]  [394]  [395]  [396]  [397]  [398]  [399]  [400]  [401]  [402]  [403]  [404]  [405]  [406]  [407]  [408]  409  [410]  [411]  [412]  [413]  [414]  [415]  [416]  [417]  [418]  [419]  [420]  [421]  [422]  [423]  [424]  [425]  [426]  [427]  [428]  [429]  [430]  [431]  [432]  [433]  [434]  [435]  [436]  [437]  [438]  [439]  [440]  [441]  [442]  [443]  [444]  [445]  [446]  [447]  [448]  [449]  [450]  [451]  [452]  [453]  [454]  [455]  [456]  [457]  [458]  [459]  [460]  [461]  [462]  [463]  [464]  [465]  [466]  [467]  [468]  [469]  [470]  [471]  [472]  [473]  [474]  [475]  [476]  [477]  [478]  [479]  [480]  [481]  [482]  [483]  [484]  [485]  [486]  [487]  [488]  [489]  [490]  [491]  [492]  [493]  [494]  [495]  [496]  [497]  [498]  [499]  [500]  [501]  [502]  [503]  [504]  [505]  [506]  [507]  [508]  [509]  [510]  [511]  [512]  [513]  [514]  [515]  [516]  [517]  [518]  [519]  [520]  [521]  [522]  [523]  [524]  [525]  [526]  [527]  [528]  [529]  [530]  [531]  [532]  [533]  [534]  [535]  [536]  [537]  [538]  [539]  [540]  [541]  [542]  [543]  [544]  [545]  [546]  [547]  [548]  [549]  [550]  [551]  [552]  [553]  [554]  [555]  [556]  [557]  [558]  [559]  [560]  [561]  [562]  [563]  [564]  [565]  [566]  [567]  [568]  [569]  [570]  [571]  [572]  [573]  [574]  [575]  [576]  [577]  [578]  [579]  [580]  [581]  [582]  [583]  [584]  [585]  [586]  [587]  [588]  [589]  [590]  [591]  [592]  [593]  [594]  [595]  [596]  [597]  [598]  [599]  [600]  [601]  [602]  [603]  [604]  [605]  [606]  [607]  [608]  [609]  [610]  [611]  [612]  [613]  [614]  [615]  [616]  [617]  [618]  [619]  [620]  [621]  [622]  [623]  [624]  [625]  [626]  [627]  [628]  [629]  [630]  [631]  [632]  [633]  [634]  [635]  [636]  [637]  [638]  [639]  [640]  [641]  [642]  [643]  [644]  [645]  [646]  [647]  [648]  [649]  [650]  [651]  [652]  [653]  [654]  [655]  [656]  [657]  [658]   下一页