Quentin Chevalier, Lesshafft Lutz, André V. G. Cavalieri
An attempt to improve the accuracy of resolvent-based predictions by including velocity correlations in the linear model is developed here. Closure assumptions for unresolved nonlinearities are thus pushed back to a higher order. Turbulent channel flow is considered as a test case: response and forcing modes obtained from singular value decomposition of the new resolvent model are compared to Spectral Proper Orthogonal Decomposition (SPOD) modes extracted from a Direct Numerical Simulation (DNS) database. The performance of the approach is also measured against previous resolvent-based models. The new model does not yield significant global improvement, but does improve predictions in some regions. Further work on the method should target the linear modeling of the velocity-pressure gradient correlation tensor.
{"title":"A second-order resolvent formulation for the analysis of turbulent flow structures","authors":"Quentin Chevalier, Lesshafft Lutz, André V. G. Cavalieri","doi":"10.5802/crmeca.193","DOIUrl":"https://doi.org/10.5802/crmeca.193","url":null,"abstract":"An attempt to improve the accuracy of resolvent-based predictions by including velocity correlations in the linear model is developed here. Closure assumptions for unresolved nonlinearities are thus pushed back to a higher order. Turbulent channel flow is considered as a test case: response and forcing modes obtained from singular value decomposition of the new resolvent model are compared to Spectral Proper Orthogonal Decomposition (SPOD) modes extracted from a Direct Numerical Simulation (DNS) database. The performance of the approach is also measured against previous resolvent-based models. The new model does not yield significant global improvement, but does improve predictions in some regions. Further work on the method should target the linear modeling of the velocity-pressure gradient correlation tensor.","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134960227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Since ancient times, natural phenomena have been observed and described, the first stage in the development of knowledge, often involving supposedly supernatural forces. It was in Europe in the 17th century that a scientific approach was developed, which became meteorology in the 19th century. A scientific approach required instruments, and it was in Florence in 1608 that the first thermometer was manufactured. Fifty years later, Ismaël Boulliau, the first French scientist to receive a thermometer from Florence, followed an approach based on observation and recording. This article sets out to show how, over the course of two centuries, a truly scientific meteorology emerged at the dawn of the twentieth century.
{"title":"L’avènement de la science météorologique du XVII e au XIX e siècle","authors":"Denis Beaudouin","doi":"10.5802/crmeca.213","DOIUrl":"https://doi.org/10.5802/crmeca.213","url":null,"abstract":"Since ancient times, natural phenomena have been observed and described, the first stage in the development of knowledge, often involving supposedly supernatural forces. It was in Europe in the 17th century that a scientific approach was developed, which became meteorology in the 19th century. A scientific approach required instruments, and it was in Florence in 1608 that the first thermometer was manufactured. Fifty years later, Ismaël Boulliau, the first French scientist to receive a thermometer from Florence, followed an approach based on observation and recording. This article sets out to show how, over the course of two centuries, a truly scientific meteorology emerged at the dawn of the twentieth century.","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135395999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article presents the scientific work of Ismaël Boulliau who was, at the same time and in turn, mathematician, astronomer, astrologer, meteorologist, but above all a scientific intermediary who exchanged an important correspondence with the greatest scholars and intellectuals of his time. It is mainly based on the thesis of the Dutch Henricus Johannes Maria Nellen translated 14 years later into French, on the occasion of the 3 rd centenary of the death of Ismaël Boulliau.
这篇文章介绍了Ismaël Boulliau的科学工作，他同时也是数学家、天文学家、占星家、气象学家，但最重要的是，他是一个科学中介，与他那个时代最伟大的学者和知识分子交换了重要的通信。它主要基于荷兰Henricus Johannes Maria Nellen的论文，14年后翻译成法语，在Ismaël Boulliau逝世3百年之际。
{"title":"L’œuvre scientifique d’Ismaël Boulliau","authors":"Marie-Claire Coët","doi":"10.5802/crmeca.207","DOIUrl":"https://doi.org/10.5802/crmeca.207","url":null,"abstract":"This article presents the scientific work of Ismaël Boulliau who was, at the same time and in turn, mathematician, astronomer, astrologer, meteorologist, but above all a scientific intermediary who exchanged an important correspondence with the greatest scholars and intellectuals of his time. It is mainly based on the thesis of the Dutch Henricus Johannes Maria Nellen translated 14 years later into French, on the occasion of the 3 rd centenary of the death of Ismaël Boulliau.","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135395172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anjélica Leconte, N. Barthès, B. Buatois, Eugénie Coutagne, H. Duval, P. Lucas, M. Staudt
{"title":"Volatile organic compound emissions from almond shoots during spring—dissociation between reproductive and vegetative organs","authors":"Anjélica Leconte, N. Barthès, B. Buatois, Eugénie Coutagne, H. Duval, P. Lucas, M. Staudt","doi":"10.5802/crchim.241","DOIUrl":"https://doi.org/10.5802/crchim.241","url":null,"abstract":"","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47898004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sonia Mancipe, Valentina Coca, J. Castillo, H. Rojas, Maria H. Brijaldo, Claudia Castañeda, José Jobanny Martínez, G. P. Romanelli
{"title":"Synthesis of acrylonitrile functionalized hydroxymethylfurfural derivatives with Mg(OH) 2 under solvent-free conditions","authors":"Sonia Mancipe, Valentina Coca, J. Castillo, H. Rojas, Maria H. Brijaldo, Claudia Castañeda, José Jobanny Martínez, G. P. Romanelli","doi":"10.5802/crchim.239","DOIUrl":"https://doi.org/10.5802/crchim.239","url":null,"abstract":"","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":"1 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41320953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We review different models for thin structures using bending as principal mechanism to undergo large deformations. Each model consists of minimizing a fourth order energy, potentially subject to a nonconvex constraint. Equilibrium deformations are approximated using local discontinuous Galerkin finite elements. The discrete energies relies on a discrete Hessian operator defined on discontinuous functions with better approximation properties than the piecewise Hessian. Discrete gradient flows are used to drive the minimization process. They are chosen for their robustness and ability to preserve the nonconvex constraint. Several numerical experiments are presented to showcase the variety of shapes achievable with these models.
{"title":"Numerical approximations of thin structure deformations","authors":"Andrea Bonito, Diane Guignard, Angelique Morvant","doi":"10.5802/crmeca.201","DOIUrl":"https://doi.org/10.5802/crmeca.201","url":null,"abstract":"We review different models for thin structures using bending as principal mechanism to undergo large deformations. Each model consists of minimizing a fourth order energy, potentially subject to a nonconvex constraint. Equilibrium deformations are approximated using local discontinuous Galerkin finite elements. The discrete energies relies on a discrete Hessian operator defined on discontinuous functions with better approximation properties than the piecewise Hessian. Discrete gradient flows are used to drive the minimization process. They are chosen for their robustness and ability to preserve the nonconvex constraint. Several numerical experiments are presented to showcase the variety of shapes achievable with these models.","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135817897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christiane Minkosse, A. Langenfeld, A. A. Azzaz, Mejdi Jeguirim, L. El-Bassi, H. Akrout, S. Jellali, C. Ghimbeu, Najat Nassr
{"title":"Short-term effects of olive-mill-wastes-derived biochars amendment and arbuscular mycorrhizal fungi inoculation on growth of maize (Zea mays) and mycorrhizal colonization","authors":"Christiane Minkosse, A. Langenfeld, A. A. Azzaz, Mejdi Jeguirim, L. El-Bassi, H. Akrout, S. Jellali, C. Ghimbeu, Najat Nassr","doi":"10.5802/crchim.234","DOIUrl":"https://doi.org/10.5802/crchim.234","url":null,"abstract":"","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46180193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Mouret, Vincent Tolassy, Freddie-Jeanne Richard
. In natural populations of A. vulgare , the endosymbiont Wolbachia feminizes genetic males. When confronted with genetic females and feminized males, males prefer genetic females. We tested whether the ability of males to discriminate both females involved the detection of chemical com-poundsbyextractingfemalecuticularcompoundsthroughvarioussolventbathsandpresentingthem to male antennae. We also tested female antennae responses to evaluate the potential impact of Wolbachia on individual detection. Our results showed that only the ethyl acetate extracts triggered a significantly di ff erent response of male antennae between the two types of females. No di ff erence be-tween female antennal detection was recorded. Further experiments are required to identify the involved molecule explaining the sexual preference of males towards Wolbachia -free females.
{"title":"Male antennae of Armadillidium vulgare discriminate Wolbachia-infected females","authors":"N. Mouret, Vincent Tolassy, Freddie-Jeanne Richard","doi":"10.5802/crchim.238","DOIUrl":"https://doi.org/10.5802/crchim.238","url":null,"abstract":". In natural populations of A. vulgare , the endosymbiont Wolbachia feminizes genetic males. When confronted with genetic females and feminized males, males prefer genetic females. We tested whether the ability of males to discriminate both females involved the detection of chemical com-poundsbyextractingfemalecuticularcompoundsthroughvarioussolventbathsandpresentingthem to male antennae. We also tested female antennae responses to evaluate the potential impact of Wolbachia on individual detection. Our results showed that only the ethyl acetate extracts triggered a significantly di ff erent response of male antennae between the two types of females. No di ff erence be-tween female antennal detection was recorded. Further experiments are required to identify the involved molecule explaining the sexual preference of males towards Wolbachia -free females.","PeriodicalId":10566,"journal":{"name":"Comptes Rendus. Chimie","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41491216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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