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Multisites and energy transfer in Cr3+-Nd3+ codoped Y3Al5O12 and YAlO3 laser crystals Cr3+-Nd3+共掺Y3Al5O12和YAlO3激光晶体的多位点和能量转移
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510150165500
J. Mares, W. Nie, G. Boulon
{"title":"Multisites and energy transfer in Cr3+-Nd3+ codoped Y3Al5O12 and YAlO3 laser crystals","authors":"J. Mares, W. Nie, G. Boulon","doi":"10.1051/JPHYS:0199000510150165500","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510150165500","url":null,"abstract":"Cr 3+ multisites, Cr 3+ →Nd 3+ energy transfer and spectroscopic properties of Cr 3+ codoped YAG:Nd and YAP:Nd crystals have been studied in detail. As in YAG:Cr, several multisites have been observed in YAP:Cr crystals. The Cr 3+ →Nd 3+ energy transfer is slightly more efficient in YAP:Nd, Cr than in YAG:Nd, Cr On etudie en detail les proprietes spectroscopiques, la presence de multisites relatifs a l'ion Cr 3+ et les transferts d'energie entre les ions Cr 3+ et Nd 3+ dans des cristaux lasers du type YAG:Nd et YAP:Nd. Comme pour le cristal YAG:Cr, plusieurs multisites ont en effet ete mis en evidence avec YAP:Cr. Le transfert d'energie Cr 3+ →Nd 3+ est un peu plus efficace avec YAP:Cr, Nd qu'avec YAG:Cr, Nd","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"96 1","pages":"1655-1669"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78054084","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
The localization transition in the Aubry model through maps 通过地图实现Aubry模型中的本地化转换
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510150163300
D. Domínguez, C. Wiecko
{"title":"The localization transition in the Aubry model through maps","authors":"D. Domínguez, C. Wiecko","doi":"10.1051/JPHYS:0199000510150163300","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510150163300","url":null,"abstract":"The equation of motion for the wave function of the 1-d Aubry model is analyzed through a 3-d map which couples the modulation parameter γ and the integrated density of states k. Numerical results are presented for constant γ and k for energy E=0 as a function of the potential strength V. The localization transition is found at V=2 as the disappearance of a well defined curve into a cloud of points. The curves grow in complexity when approaching the critical value from below. We define a mean radius for the xy-plane projection of the 3-d map and we show numerically that it converges to a finite constant for V L'equation de mouvement pour le modele d'Aubry unidimensionnel est etudiee a l'aide d'une application 3-d qui couple le parametre de modulation γ avec la densite d'etats integree k. Nous presentons des resultats numeriques pour l'energie E=0 et pour γ et k constants en fonction du potentiel V. Pour V=2 la transition de localisation se manifeste par le passage d'une courbe bien definie a un nuage de points. La complexite des courbes augmente lorsqu'on approche par en dessous la valeur critique. Nous definissons un rayon moyen pour la projection sur le plan x-y de l'application 3-d et nous montrons numeriquement qu'il converge vers une constante finie pour V<2. D'autre part, son comportement critique est analyse pour un γ egal au nombre d'or. Finalement, nous discutons des resultats anterieurs sur la chaine desordonnee","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"6 1","pages":"1633-1643"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87267288","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: 0
Smectic B : long range translational order and static shear instability. Nonlinear effects Smectic B:长程平动有序和静态剪切不稳定。非线性效应
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510160176900
I. S. Gersht, V. Pershin
{"title":"Smectic B : long range translational order and static shear instability. Nonlinear effects","authors":"I. S. Gersht, V. Pershin","doi":"10.1051/JPHYS:0199000510160176900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510160176900","url":null,"abstract":"Terms nonlinear with respect to the wave vector at translational oscillation frequencies have been taken into account for a layer system of uniaxial molecules and it has been proved that crystal order can coexist with a shear instability. On this basis a new model of smectic B phase has been proposed where the structure possessed long range translational order in all directions. At the same time interlayer dynamical shear modulus decreases at lower ω ap frequencies of an applied strain and equals zero in the static case (ω ap →0)","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"44 1","pages":"1769-1776"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88140827","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
A zipper model approach to the thermoreversible gel-sol transition 热可逆凝胶-溶胶转变的拉链模型方法
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510160175900
K. Nishinari, S. Koide, Peter A. Williams, G. Phillips
{"title":"A zipper model approach to the thermoreversible gel-sol transition","authors":"K. Nishinari, S. Koide, Peter A. Williams, G. Phillips","doi":"10.1051/JPHYS:0199000510160175900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510160175900","url":null,"abstract":"Le modele propose permet de simuler les endothermes observes en DSC lors de la transition gel-sol si la liberte rotationnelle des liaisons, l'energie de liaison et le nombre de liaisons dans les gels sont correctement choisis. Le modele est applique a des gels de poly(vinyl alcool), de carraghenane et de melange carraghenane-glucomannane","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"4 1","pages":"1759-1768"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87509936","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: 47
Nucleation and growth of cholesteric fingers under electric field 电场作用下胆甾指的成核与生长
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510160170300
P. Ribière, P. Oswald
{"title":"Nucleation and growth of cholesteric fingers under electric field","authors":"P. Ribière, P. Oswald","doi":"10.1051/JPHYS:0199000510160170300","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510160170300","url":null,"abstract":"We have studied the behavior of a cholesteric liquid crystal sandwiched between two plates, with homeotropic anchoring, in the presence of an electric field. By changing two control parameters, namely the sample thickness and the electric field magnitude, we were able to characterize different types of solutions: a nematic phase (unwound cholesteric), isolated doubly twisted fingers, a periodic pattern of fingers arranged side by side, and a transient singly twisted translationally invariant configuration. Including the electric field contribution to the calculations of reference [3], we have computed a theoretical phase diagram that agrees well with the experimental data. The consideration of anisotropic elasticity in our calculations was essential in explaining our observations","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"88 1","pages":"1703-1720"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90669173","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: 39
Density-conformation coupling in macromolecular systems: polymer interfaces 大分子体系中的密度-构象耦合:聚合物界面
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510160168300
J. Carton, L. Leibler
{"title":"Density-conformation coupling in macromolecular systems: polymer interfaces","authors":"J. Carton, L. Leibler","doi":"10.1051/JPHYS:0199000510160168300","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510160168300","url":null,"abstract":"We define local order parameters to take into account the orientation of monomers and molecules in polymer systems. These fields are naturally coupled to density gradients. Such couplings lead to interesting effects in the neighbourhood of interfaces (polymer-solvent and polymer-polymer cases are considered): macromolecules are prolate on one side, oblate on the other","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"103 1","pages":"1683-1691"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80641391","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: 20
On the replica approach to random directed polymers in two dimensions 二维随机定向聚合物的复制方法研究
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510150159500
G. Parisi
{"title":"On the replica approach to random directed polymers in two dimensions","authors":"G. Parisi","doi":"10.1051/JPHYS:0199000510150159500","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510150159500","url":null,"abstract":"In this note we study directed polymers in a two dimensional random medium with short range noise using the replica approach. We find the predictions of the replica symmetric theory and we compare them with exact results. We consider the possibility of spontaneous symmetry breaking and we suggest that replica symmetry is weakly broken also in this two dimensional model","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"5 1","pages":"1595-1606"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80069439","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: 45
Proton spin-lattice relaxation study of the neutral-to-ionic transition in TTF-chloranil ttf -氯胺中中性向离子跃迁的质子自旋-晶格弛豫研究
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510160167100
B. Thudic, J. Gallier, M. Boumaza, H. Cailleau
{"title":"Proton spin-lattice relaxation study of the neutral-to-ionic transition in TTF-chloranil","authors":"B. Thudic, J. Gallier, M. Boumaza, H. Cailleau","doi":"10.1051/JPHYS:0199000510160167100","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510160167100","url":null,"abstract":"The neutral to ionic transition of tetrathiafulvalene-p-chloranil is studied by nuclear magnetic resonance. Whereas the second moment of the 1 H resonance line is not appreciably sensitive to this phase transition, because no large amplitude motions are concerned, the proton spin-lattice relaxation time T 1 presents an obvious discontinuity at T N−I . This behaviour is discussed in terms of the created paramagnetic species related to the dimerization in the ionic phase Nous presentons une etude par RMN de la transition neutre-ionique du tetrathiafulvalene-p-chloranile. Alors que le second moment de la raie de resonance du proton n'est pas sensiblement affecte par cette transition de phase ne concernant pas de mouvement de grandes amplitudes, le temps de relaxation spin-reseau presente une nette discontinuite a T N−I . Ce comportement est discute en considerant les centres paramagnetiques crees en relation avec la dimerisation de la phase ionique","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"22 1","pages":"1671-1678"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78833438","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: 9
Polymer chain in annealed random media 退火随机介质中的聚合物链
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510160167900
A. Baumgärtner, B. Chakrabarti
{"title":"Polymer chain in annealed random media","authors":"A. Baumgärtner, B. Chakrabarti","doi":"10.1051/JPHYS:0199000510160167900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510160167900","url":null,"abstract":"Self-avoiding polymer chains trapped in annealed random media have been investigated by Monte Carlo methods. It is found that the configurational characteristics of a polymer are not affected by the media and are independent of the concentration of the impurities. This is in agreement with an early conjecture, but in disagreement with recent analytical results","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"108 1","pages":"1679-1682"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76274008","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: 4
Electro-optical and thermal studies of one ferroelectric liquid-crystal compound with a polarization sign reversal 一种具有极化符号反转的铁电液晶化合物的电光和热研究
Journal De Physique Pub Date : 1990-08-01 DOI: 10.1051/JPHYS:0199000510160174900
Cheng-Cher Huang, T. Min, Deng-Sung Lin, B. Zhou, J. Goodby
{"title":"Electro-optical and thermal studies of one ferroelectric liquid-crystal compound with a polarization sign reversal","authors":"Cheng-Cher Huang, T. Min, Deng-Sung Lin, B. Zhou, J. Goodby","doi":"10.1051/JPHYS:0199000510160174900","DOIUrl":"https://doi.org/10.1051/JPHYS:0199000510160174900","url":null,"abstract":"Temperature variations of heat capacity, optical tilt angle, polarization, and helical pitch have been measured in the vicinity of the smectic-A (SmA)-chiral-smectic-C (SmC*) transition of one liquid-crystal compound which exhibits an unusual reversal behavior in polarization at about 25°C while the SmA-SmC* transition occurs at 50°C. Unexpectedly, from our detailed calorimetric and optical microscopy studies, we have found that the recrystallization also occurs around 25°C during a reasonably slow cooling experimental run","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"20 1","pages":"1749-1757"},"PeriodicalIF":0.0,"publicationDate":"1990-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83312750","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: 2
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