The Wilson coefficients of the standard model effective field theory are subject to a series of positivity bounds.It has been shown that while the positivity part of the ultraviolet(UV)partial wave unitarity leads to ...The Wilson coefficients of the standard model effective field theory are subject to a series of positivity bounds.It has been shown that while the positivity part of the ultraviolet(UV)partial wave unitarity leads to the Wilson coefficients living in a convex cone,further including the nonpositivity part caps the cone from above.For Higgs scattering,a capped positivity cone was obtained using a simplified,linear unitarity condition without utilizing the full internal symmetries of Higgs scattering.Here,we further implement stronger nonlinear unitarity conditions from the UV,which generically gives rise to better bounds.We show that,for the Higgs case in particular,while the nonlinear unitarity conditions per se do not enhance the bounds,the fuller use of the internal symmetries do shrink the capped positivity cone significantly.展开更多
目的坐立转换(sit to stand,STS)是人日常生活中常见的活动。座椅高度是STS任务最重要的决定因素之一。通过建立股骨近端有限元模型,分析在STS站立阶段初期,股骨近端在不同座椅高度起立的应力特征和应变数据,探讨其损伤的风险。方法使用...目的坐立转换(sit to stand,STS)是人日常生活中常见的活动。座椅高度是STS任务最重要的决定因素之一。通过建立股骨近端有限元模型,分析在STS站立阶段初期,股骨近端在不同座椅高度起立的应力特征和应变数据,探讨其损伤的风险。方法使用Mimics软件进行股骨近端的三维重建;使用Geomagic Studio软件进行逆向建模;使用Ansys进行有限元建模与分析,材料密度为2080 kg/m^(3),弹性模量为17 GPa,泊松比为0.265;模型有效性通过模拟中立位单体站立验证。展开更多
基金supported by the Fundamental Research Funds for the Central Universities(WK2030000036)the National Natural Science Foundation of China(12075233).
文摘The Wilson coefficients of the standard model effective field theory are subject to a series of positivity bounds.It has been shown that while the positivity part of the ultraviolet(UV)partial wave unitarity leads to the Wilson coefficients living in a convex cone,further including the nonpositivity part caps the cone from above.For Higgs scattering,a capped positivity cone was obtained using a simplified,linear unitarity condition without utilizing the full internal symmetries of Higgs scattering.Here,we further implement stronger nonlinear unitarity conditions from the UV,which generically gives rise to better bounds.We show that,for the Higgs case in particular,while the nonlinear unitarity conditions per se do not enhance the bounds,the fuller use of the internal symmetries do shrink the capped positivity cone significantly.
文摘W942002 土壤氮动态 SACFARM 模型有效性的初步结果[刊,意]/Spallacci,P.…∥Annali dell’Isti-tuto Sperimentale Agronomico.-1990,21(Suppl.2).-143～162(WBTA,1993,10(2),1597]W942003 早种植引起的土壤团粒性、有机物质及微生物生物量的变化[刊,英]/Angers,D.A.…∥Soil Science Society of America Journal.-1992。
