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论法律行为的部分无效与全部无效 被引量:8
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作者 陆家豪 《东方法学》 CSSCI 北大核心 2022年第1期161-173,共13页
关于民法典第156条的解释,究竟采取部分有效原则还是全部无效原则,学说上存在争议,这个问题存在区分实益。采取全部无效原则更有利于维护当事人的私法自治、更符合举证责任分配规则、更符合法史传统、更符合我国裁判实务。在进行意思表... 关于民法典第156条的解释,究竟采取部分有效原则还是全部无效原则,学说上存在争议,这个问题存在区分实益。采取全部无效原则更有利于维护当事人的私法自治、更符合举证责任分配规则、更符合法史传统、更符合我国裁判实务。在进行意思表示解释时,应当分别从行为的一体性与可分性来进行判断。在一体性的判断上,需以当事人的意思优先,结合考虑经济上的紧密关联与相同当事人关联。在可分性的判断上,存在内容、当事人可分性与时间可分性。需要通过假定的当事人意思来进行价值权衡,从而判定法律行为是部分无效还是全部无效。 展开更多
关键词 行为一体性 行为可分性 当事人意思 价值权衡 法律行为 法律效力
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A new barium-containing alkali metal silicate fluoride NaBa3Si2O7F with deep-UV optical property 被引量:3
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作者 Zhaohong Miao Yun Yang +3 位作者 Zhonglei Wei Zhihua Yang Tushagu Abudouwufu Shilie Pan 《Science China Materials》 SCIE EI CSCD 2019年第10期1454-1462,共9页
A new silicate fluoride,NaBa3 Si207 F,has been successfully synthesized by a high-temperature solution method.It crystallizes in the orthorhombic space group Cmcm(No.63).NaBa3 Si2 O7 F is the first barium-containing a... A new silicate fluoride,NaBa3 Si207 F,has been successfully synthesized by a high-temperature solution method.It crystallizes in the orthorhombic space group Cmcm(No.63).NaBa3 Si2 O7 F is the first barium-containing alkali metal silicate fluoride with the[NaO6]polyhedra,the[BaO8 F]polyhedra and isolated[Si2 O7]units.The optical characterizations indicate that NaBa3 Si2 O7 F possesses wide transparent window and available luminescence properties.To confirm the coordination surroundings of anionic groups and its thermostability,infrared spectroscopy and thermal behaviors were also analyzed,which proved the existence of tetrahedronly coordinated silicium atoms and the good stability of NaBa3 Si2 O7 F at high temperature.First-principles calculation was also implemented for better understanding the relationship between the structure of NaBa3 Si207 F and its property.Additionally,to further explore the structural novelty of NaBa3 Si2 O7 F,the comparison of the anionic structures was carried out in mixed alkali and alkaline-earth metal silicate fluorides.Interestingly,the result indicates the isolated[Si2 O7]dimer is rare among the above systems,which enriches the structural chemistry of silicate fluorides. 展开更多
关键词 silicate fluoride deep-ultraviolet transparent window structure-properties relationship structure comparison
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The relationship between intraspecific assortative mating and reproductive isolation between divergent populations 被引量:1
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作者 Daniel I. BOLNICK Mark KIRKPATRICK 《Current Zoology》 SCIE CAS CSCD 2012年第3期484-492,共9页
The term 'assortative mating' has been applied to describe two very different phenomena: (1) the tendency for indi- viduals to choose phenotypically similar mates from among conspecifics; or (2) the tendency to... The term 'assortative mating' has been applied to describe two very different phenomena: (1) the tendency for indi- viduals to choose phenotypically similar mates from among conspecifics; or (2) the tendency to prefer conspecific over hete- rospecific mates (behavioral reproductive isolation). Both forms of assortative mating are widespread in nature, but the relation- ship between these behaviors remains unclear. Namely, it is plausible that a preference for phenotypically similar conspecifics in cidentally reduces the probability of mating with phenotypically divergent heterospecifics. We present a model to calculate how the level of reproductive isolation depends on intraspecific assortative mating and the phenotypic divergence between species. For empirically reasonable levels of intraspecific assortment on a single trait axis, we show that strong reproductive isolation requires very substantial phenotypic divergence. We illustrate this point by applying our model to empirical data from threespine stickleback Gasterosteus aculeatus and Darwin's Finches (Geospiza spp). We conclude that typical levels of intraspecific assortment cannot generally be extrapolated to explain levels of interspecific reproductive isolation. Instead, reproductive isolation between species likely arises from different mate choice behaviors, or multivariate assortative mating [Current Zoology 58 (3): 484-492, 2012]. 展开更多
关键词 Assortative mating HYBRIDIZATION Mating preference Reproductive isolation SPECIATION
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