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Journal De Physique Iii最新文献

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Une méthode générale pour modéliser les convertisseurs statiques associés à des dispositifs magnétiques 与磁性器件相关的静态变换器建模的一般方法
Journal De Physique Iii Pub Date : 1997-11-01 DOI: 10.1051/JP3:1997254
J. Charpentier, Y. Lefèvre, H. Piquet
{"title":"Une méthode générale pour modéliser les convertisseurs statiques associés à des dispositifs magnétiques","authors":"J. Charpentier, Y. Lefèvre, H. Piquet","doi":"10.1051/JP3:1997254","DOIUrl":"https://doi.org/10.1051/JP3:1997254","url":null,"abstract":"In this paper a general method for modelling power electronics circuits associated with electromagnetic devices is presented. This model is based on the simultaneous resolution of the circuit equations and the field equations in electromagnetic devices and on a general solution for taking into account the switching of semiconductors. This method allows to consider phenomena such as eddy currents and saturation of magnetic materials in the electromagnetic devices associated with static converters. \u0000Dans cet article, nous presentons une methode generale pour simuler les ensembles constitues de convertisseurs statiques associes a des structures magnetiques. Cette solution est basee sur la resolution simultanee des equations de type circuit du convertisseur couplees aux equations du champ dans la structure magnetique et sur une methode generale pour gerer l'etat des interrupteurs du circuit. Il est alors possible de considerer des phenomenes tels que les courants de Foucault ou la saturation des materiaux dans des structures associees a des convertisseurs.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117334498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Modes of Hydrogen Incorporation in Hydrogenated Amorphous Carbon (a~C:H), Modifications with Annealing Temperature (*) 氢化非晶碳中氢的结合模式(a~C:H)，随退火温度的变化(*)
Journal De Physique Iii Pub Date : 1997-11-01 DOI: 10.1051/JP3:1997248
Y. Bounouh, K. Zellama, A. Zeinert, M. Benlahsen, M. Clin, M. Thèye
{"title":"Modes of Hydrogen Incorporation in Hydrogenated Amorphous Carbon (a~C:H), Modifications with Annealing Temperature (*)","authors":"Y. Bounouh, K. Zellama, A. Zeinert, M. Benlahsen, M. Clin, M. Thèye","doi":"10.1051/JP3:1997248","DOIUrl":"https://doi.org/10.1051/JP3:1997248","url":null,"abstract":"In order to obtain more information about the nature of the hydrogen bonding and the thermal stability of a-C:H films, we have studied two different types of films labeled I and II deposited in a d.c. multipolar plasma system from pure methane at substrate bias equal to -40 and 600 V respectively. A combination of several complementary techniques has been carried out on the samples in their as-deposited state as well as after isochronal annealing cycles at increasing temperatures up to 650 ° C. The results clearly indicate that the two types of samples have very different H bonding and microstructure in their as-deposited state. They also behave differently upon annealing and still exhibit quite different microstructures and H bonding configurations up to high annealing temperature.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130880056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Analyse de l'effet des courants induits sur l'impédance d'un système électromagnétique alimenté en tension BF ou HF. Utilisation de la méthode des circuits couplés 分析在BF或HF电压供电的电磁系统中感应电流对阻抗的影响。使用耦合电路方法
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997235
B. Maouche, M. Feliachi
{"title":"Analyse de l'effet des courants induits sur l'impédance d'un système électromagnétique alimenté en tension BF ou HF. Utilisation de la méthode des circuits couplés","authors":"B. Maouche, M. Feliachi","doi":"10.1051/JP3:1997235","DOIUrl":"https://doi.org/10.1051/JP3:1997235","url":null,"abstract":"Dans cet article nous proposons l'etude de l'influence d'une charge (induit) conductrice sur la repartition du courant inducteur ainsi que sur l'impedance du systeme. L'inducteur est a geometrie axisymetrique de forme solenoidale ou pancake destine au chauffage par induction. Une methode semi-analytique, basee sur une discretisation du domaine en mailles elementaires auxquelles s'applique une formulation integrale (Methode des Circuits Couples: MCC) des grandeurs electromagnetiques, est utilisee. Dans le cas ou l'effet de peau est important (Haute Frequence: HF), la formulation associe la Condition d'Impedance de Surface; dans le cas contraire (Basse Frequence: BF), un maillage du domaine interne est pratique.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123500757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Local Atomic Redistribution Under Irradiation in γ–NiFeCr Alloys γ-NiFeCr合金辐照下的局部原子重分布
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997231
A. Menshikov, C. Dimitrov, A. Teplykh
{"title":"Local Atomic Redistribution Under Irradiation in γ–NiFeCr Alloys","authors":"A. Menshikov, C. Dimitrov, A. Teplykh","doi":"10.1051/JP3:1997231","DOIUrl":"https://doi.org/10.1051/JP3:1997231","url":null,"abstract":"La redistribution atomique induite par irradiation a ete etudiee par mesures de diffusion diffuse de neutrons dans des alliages NiFeCr prepares a partir de l'isotope 62 Ni: Ni 50 Fe 42,5 Cr 7,5 ,Ni 48 Fe 38 Cr 14 et Ni 46 Fe 34 Cr 20 . Les mesures ont ete effctuees a la temperature ambiante sur des poudres cristallines, irradiees a 310 °C par des electrons de 2,5 MeV a une fluence de 1 x 10 18 e - cm -2 . Les parametres d'ordre a courte distance de Warren-Cowley ont ete determines sur trois spheres de coordination. Le degre d'ordre dans les alliages irradies est plus eleve que celui obtenu par des traitements thermiques effectues a plus haute temperature. Le modele propose pour la redistribution atomique est un ordre local du type Ni(Cr,Fe) avec une tendance a la formation preferentielle de paires Ni-Cr.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131010602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Phenomena in Conductors Having Temperature Dependent Electrical and Thermal Conductivities 具有温度相关导电性和导热性的导体中的现象
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997239
G. Fournet
{"title":"Phenomena in Conductors Having Temperature Dependent Electrical and Thermal Conductivities","authors":"G. Fournet","doi":"10.1051/JP3:1997239","DOIUrl":"https://doi.org/10.1051/JP3:1997239","url":null,"abstract":"Les repartitions des temperatures et du potentiel electrique [T(r) et V(r)] au sein d'un conducteur de forme quelconque, caracterise par des conductivites thermique et electrique [λ(T) et γ(T)] et parcouru par un courant d'intensite I constante, peuvent etre determinees par des expressions generales. Ces expressions ont pour parametre le potentiel Vo(r) du conducteur en regime isotherme; ce potentiel peut etre atteint par le calcul ou par des mesures dans le cas ou l'intensite I tend vers zero. Les expressions generale sont explicitees dans le cas ou λ(T) et Tγ(T) sont constants.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"51 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125708396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Spectral Evolution During Ultracold Neutron Storage 超冷中子贮存过程中的光谱演化
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997233
A. Steyerl, S. Malik, P. Geltenbort, S. Neumaier, V. V. Nesvizhevskii, M. Utsuro, Y. Kawabata
{"title":"Spectral Evolution During Ultracold Neutron Storage","authors":"A. Steyerl, S. Malik, P. Geltenbort, S. Neumaier, V. V. Nesvizhevskii, M. Utsuro, Y. Kawabata","doi":"10.1051/JP3:1997233","DOIUrl":"https://doi.org/10.1051/JP3:1997233","url":null,"abstract":"In a precision measurement of the spectrum of ultracold neutrons as it evolves during storage in a “neutron bottle\" we have observed an indication of a surprising heating by ≈ 10-10 eV, occurring during the initial several 100 s of storage. We have not found any simple explanation. The data are, however, consistent with unconventional ideas proposed previously by two of us.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121889395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Model and Measure of Flows at the Intake of Engines 发动机进气流量的模型与测量
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997101
L. L. Moyne, F. Maroteaux, P. Guibert, M. Murat
{"title":"Model and Measure of Flows at the Intake of Engines","authors":"L. L. Moyne, F. Maroteaux, P. Guibert, M. Murat","doi":"10.1051/JP3:1997101","DOIUrl":"https://doi.org/10.1051/JP3:1997101","url":null,"abstract":"A simple physical model is developed to simulate the annular dispersed multiphase flow observed at the intake of spark ignition port-injected engines. The model is a separate phase 2D model taking into account gas, droplets and liquid film phases. It is validated by the results of different measurements made on engine. Temperature, pressure and velocity measurements are made in the intake manifold of a production engine in order to characterize the flows of gaseous phases. Velocity measurements are also made for injected fuel droplets. Global equivalence ratio measurements are made to validate modeling of deposited fuel film on manifold walls.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114489555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Dimensionnement d'une machine a commutation electronique monophasee haute vitesse à réluctance et aimants alternés 单相高速磁阻交流磁体电子开关机的尺寸
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997240
A. B. Ahmed, E. Aufauvre, B. Multon
{"title":"Dimensionnement d'une machine a commutation electronique monophasee haute vitesse à réluctance et aimants alternés","authors":"A. B. Ahmed, E. Aufauvre, B. Multon","doi":"10.1051/JP3:1997240","DOIUrl":"https://doi.org/10.1051/JP3:1997240","url":null,"abstract":"Les auteurs presentent dans cet article le dimensionnement d'une machine monophasee a aimants alternes statoriques a bobinage global et a circuit magnetique massif realise a partir de poudre de fer. La methode utilisee combine un calcul numerique par elements finis et un calcul analytique en regime lineaire. Le dimensionnement complet notamment la determination des couples instantanes prenant en compte l'encombrement global de la machine, les pertes Joule et fer ainsi que les conditions de demarrage est effectue. Apres avoir defini le modele de calcul a partir d'un schema magnetique equivalent, une etude parametrique est realisee. Celle-ci a pour but d'etudier l'influence de certains parametres fondamentaux tels que la largeur angulaire des dents rotoriques sur les performances de la machine et particulierement sur les conditions de demarrage en mode monophase. Les resultats theoriques sont ensuite confrontes aux releves experimentaux effectues sur plusieurs prototypes de machines a aimants ferrites.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123558768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A Generalized Minimal Residual Acceleration of the Charge Iteration Procedure 电荷迭代过程的广义最小剩余加速度
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997234
G. Aiello, S. Alfonzetti, G. Borzì
{"title":"A Generalized Minimal Residual Acceleration of the Charge Iteration Procedure","authors":"G. Aiello, S. Alfonzetti, G. Borzì","doi":"10.1051/JP3:1997234","DOIUrl":"https://doi.org/10.1051/JP3:1997234","url":null,"abstract":"L'iteration de charge est une procedure pour le calcul de champs electrostatiques produits par des conducteurs sous tension. Elle est fondee sur l'amelioration iterative de la condition de Dirichlet sur une limite fictive qui renferme tous les conducteurs. Dans ce papier il est demontre que l'amelioration est equivalente a l'usage de la methode de Richardson pour un systeme reduit. Une grande reduction de la demande de temps de calcul et de memoire est obtenue au moyen de l'acceleration GMRES sur ce systeme reduit.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125469528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 24
Improved Characterization of Non-Stationary Flows Using a Regularized Spectral Analysis of Ultrasound Doppler Signals 利用超声多普勒信号的正则化频谱分析改进非平稳流的表征
Journal De Physique Iii Pub Date : 1997-10-01 DOI: 10.1051/JP3:1997242
A. Herment, J. Giovannelli, G. Demoment, B. Diebold, A. Delouche
{"title":"Improved Characterization of Non-Stationary Flows Using a Regularized Spectral Analysis of Ultrasound Doppler Signals","authors":"A. Herment, J. Giovannelli, G. Demoment, B. Diebold, A. Delouche","doi":"10.1051/JP3:1997242","DOIUrl":"https://doi.org/10.1051/JP3:1997242","url":null,"abstract":"This paper addresses the problem of ultrasound Doppler spectral estimation when only a short observation set is available. Following the work of Kitagawa and Gersch, the spectra are described by a long autoregressive model whose coefficients are estimated in a Bayesian regularized least squares framework accounting for spectral smoothness in order to avoid too spiky spectra. The critical computation of the tradeoff parameters is addressed using both maximum likelihood and generalized cross validation criteria in order to automatically tune the smoothness constraint. The practical potential of the method is demonstrated using both simulated and in vitro signals. In a Monte-Carlo simulation study, investigation of quantitative indices such as quadratic distances shows interesting improvements with respect to the usual least squares method whatever the window data length and the signal to noise ratio. When applied to actual Doppler signals, the proposed method offers better description of the Doppler spectrum morphology than the usual least squares one.","PeriodicalId":237595,"journal":{"name":"Journal De Physique Iii","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127464240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
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