The structure of cylindrical tri-sine oscillating tooth gear drive is presented. Based on the space meshing theory, equations of meshing and tooth profile are established and its meshing theory is studied. Using Pro/E...The structure of cylindrical tri-sine oscillating tooth gear drive is presented. Based on the space meshing theory, equations of meshing and tooth profile are established and its meshing theory is studied. Using Pro/E, this system is modeled and simulated,which is compared with the above-established equations.展开更多
The present paper covers the structure of a new sesterterpene, phyllofenone A(1) , isolated from the South China Sea sponge Phyllospongia foliascens. Phyllofenone A is a member of the scalarane class of sesterterpenes...The present paper covers the structure of a new sesterterpene, phyllofenone A(1) , isolated from the South China Sea sponge Phyllospongia foliascens. Phyllofenone A is a member of the scalarane class of sesterterpenes with a (C-20, C-24)-bishomo-(C-25)-nortetra-cyclic skeleton. The structure charcterization was based on one- and two-dimensional NMR and mass spectroscopy with the assistance of molecular modeling. Phyllofenone A shows weak antifungal activity against Candida pseudotropicalis.展开更多
The specimens were from 110 patients with primary hepatic carcinoma. The formalin- fixed and paraffin-embedded sections were stained for HBxAg by ABC method and for HBsAg and HBcAg by PAP method. Of the 110 cases, 64 ...The specimens were from 110 patients with primary hepatic carcinoma. The formalin- fixed and paraffin-embedded sections were stained for HBxAg by ABC method and for HBsAg and HBcAg by PAP method. Of the 110 cases, 64 (58. 2%) showed HBxAg-positive reaction in tumor tissue, and 63 (78. 8%) of 80 cases displayed positive HBxAg in surrounding non-cancerous hepatic tissue. Among the 64 cases with positive HBxAg in tumor tissue, 15 (23. 4%) were associated with HBsAg and/or HBcAg, while in the 63 cases with positive HBxAg in non-tumor tissue, 45(71. 4%) were accompanied with HBsAg and/or HBcAg. These findings suggest a dose relationship between prlmay hepatic carcinoma and HBV infection. The high detection rate of HBxAg Indicates a very active expression of the Integrated HBV- DNA genome in the host cells. However, the action of HBxAg in pathogenesis of hepatocellular carcinoma remains to be further investigated.展开更多
The aim is to put forward the optimal selecting of weights in variational problemin which the linear advection equation is used as constraint. The selection of the functionalweight coefficients ( FWC) is one of the ke...The aim is to put forward the optimal selecting of weights in variational problemin which the linear advection equation is used as constraint. The selection of the functionalweight coefficients ( FWC) is one of the key problems for the relevant research. It wasarbitrary and subjective to some extent presently. To overcome this difficulty, thereasonable assumptions were given for the observation field and analyzed field, variationalproblems with " weak constraints" and " strong constraints" were considered separately. Bysolving Euler' s equation with the matrix theory and the finite difference method of partialdifferential equation, the objective weight coefficients were obtained in the minimumvariance of the difference between the analyzed field and ideal field. Deduction results showthat theoretically the optimal selection indeed exists in the weighting factors of the costfunction in the means of the minimal variance between the analysis and ideal field in terms ofthe matrix theory and partial differential ( corresponding difference ) equation, if thereasonable assumption from the actual problem is valid and the differnece equation is stable.It may realize the coordination among the weight factors, numerical models and theobservational data. With its theoretical basis as well as its prospects of applications, thisobjective selecting method is probably a way towards the finding of the optimal weightingfactors in the variational problem.展开更多
The authors have agreed to credit Fabrice Vinatier authorship for this paper.The list of authors and affiliations should appear as follows:Fatiha Choukri a,Damien Raclot a,b.Mustapha Naimi a,Mohamed Chikhaoui a,Joao P...The authors have agreed to credit Fabrice Vinatier authorship for this paper.The list of authors and affiliations should appear as follows:Fatiha Choukri a,Damien Raclot a,b.Mustapha Naimi a,Mohamed Chikhaoui a,Joao Pedro Nunes c,Frederic Huard d,Cecile Herivaux e,Fabrice Vinatier b,Mohamed Sabir f,Yannick Pepin a,b a IAV Hassan II,Department of Natural Resources and Environment,Madinat Al Irfane,Rabat,Morocco b LISAH,Univ Montpellier,INRAE,IRD,Institut Agro,Montpellier,France c CE3C-Centre for Ecology,Evolution and Environmental Changes,Faculdade de Ciencias,Universidade de Lisboa,1749-016,Lisboa,Portugal d INRAE-AgroClim,228 Route de TAerodrome,CS 40509,84914,Avignon,Cedex 9,France e BRGM,Univ Montpellier,1039 Rue de Pinville,34000,Montpellier,France f ENFI,bd Moulay Youssef,Tabriquet,SALE,Morocco The authors would like to apologise for any inconvenience caused.展开更多
文摘The structure of cylindrical tri-sine oscillating tooth gear drive is presented. Based on the space meshing theory, equations of meshing and tooth profile are established and its meshing theory is studied. Using Pro/E, this system is modeled and simulated,which is compared with the above-established equations.
基金Supported by the National Natural Science Foundation of China
文摘The present paper covers the structure of a new sesterterpene, phyllofenone A(1) , isolated from the South China Sea sponge Phyllospongia foliascens. Phyllofenone A is a member of the scalarane class of sesterterpenes with a (C-20, C-24)-bishomo-(C-25)-nortetra-cyclic skeleton. The structure charcterization was based on one- and two-dimensional NMR and mass spectroscopy with the assistance of molecular modeling. Phyllofenone A shows weak antifungal activity against Candida pseudotropicalis.
文摘The specimens were from 110 patients with primary hepatic carcinoma. The formalin- fixed and paraffin-embedded sections were stained for HBxAg by ABC method and for HBsAg and HBcAg by PAP method. Of the 110 cases, 64 (58. 2%) showed HBxAg-positive reaction in tumor tissue, and 63 (78. 8%) of 80 cases displayed positive HBxAg in surrounding non-cancerous hepatic tissue. Among the 64 cases with positive HBxAg in tumor tissue, 15 (23. 4%) were associated with HBsAg and/or HBcAg, while in the 63 cases with positive HBxAg in non-tumor tissue, 45(71. 4%) were accompanied with HBsAg and/or HBcAg. These findings suggest a dose relationship between prlmay hepatic carcinoma and HBV infection. The high detection rate of HBxAg Indicates a very active expression of the Integrated HBV- DNA genome in the host cells. However, the action of HBxAg in pathogenesis of hepatocellular carcinoma remains to be further investigated.
基金Foundation items: the National Natural Science Foundation of China (40075005) the National Key Basic Research Development Project Program of China (G1998040909)
文摘The aim is to put forward the optimal selecting of weights in variational problemin which the linear advection equation is used as constraint. The selection of the functionalweight coefficients ( FWC) is one of the key problems for the relevant research. It wasarbitrary and subjective to some extent presently. To overcome this difficulty, thereasonable assumptions were given for the observation field and analyzed field, variationalproblems with " weak constraints" and " strong constraints" were considered separately. Bysolving Euler' s equation with the matrix theory and the finite difference method of partialdifferential equation, the objective weight coefficients were obtained in the minimumvariance of the difference between the analyzed field and ideal field. Deduction results showthat theoretically the optimal selection indeed exists in the weighting factors of the costfunction in the means of the minimal variance between the analysis and ideal field in terms ofthe matrix theory and partial differential ( corresponding difference ) equation, if thereasonable assumption from the actual problem is valid and the differnece equation is stable.It may realize the coordination among the weight factors, numerical models and theobservational data. With its theoretical basis as well as its prospects of applications, thisobjective selecting method is probably a way towards the finding of the optimal weightingfactors in the variational problem.
文摘The authors have agreed to credit Fabrice Vinatier authorship for this paper.The list of authors and affiliations should appear as follows:Fatiha Choukri a,Damien Raclot a,b.Mustapha Naimi a,Mohamed Chikhaoui a,Joao Pedro Nunes c,Frederic Huard d,Cecile Herivaux e,Fabrice Vinatier b,Mohamed Sabir f,Yannick Pepin a,b a IAV Hassan II,Department of Natural Resources and Environment,Madinat Al Irfane,Rabat,Morocco b LISAH,Univ Montpellier,INRAE,IRD,Institut Agro,Montpellier,France c CE3C-Centre for Ecology,Evolution and Environmental Changes,Faculdade de Ciencias,Universidade de Lisboa,1749-016,Lisboa,Portugal d INRAE-AgroClim,228 Route de TAerodrome,CS 40509,84914,Avignon,Cedex 9,France e BRGM,Univ Montpellier,1039 Rue de Pinville,34000,Montpellier,France f ENFI,bd Moulay Youssef,Tabriquet,SALE,Morocco The authors would like to apologise for any inconvenience caused.
