L.德布罗意和D.玻姆

Ｌ．德布罗意（１８９２—１９８７）在１９２７年提出了局域性的“双重解理论”和非局域性的“波导理论”．１９２７年１０月的索尔维物理学会议后,德布罗意放弃了后一理论,Ｌ．德布罗意与Ｄ．玻姆（１９１７—１９９２）的共同立场简言之就是：“波导理论”,他们之间的分歧简言之就是“双重解理论”同“波导理论”之间的分歧．     

M序列反馈函数的派生方法

本文提出了三种k无M序列反馈函数的派生方法。第一种方法可从一个给定的M馈派生k-1个新的M馈;第二种方法可派生k(k-1)~2个M馈,并推广了这种派生方法;第三种方法可派生k~(n-1)个M馈。     

Effects of the hierarchical pyrolysis polyaniline on reversible hydrogen storage of LiBH4

In this work,LiBH_4–20 wt%PP composite was prepared by ball-milling with as-synthesized hierarchical pyrolysis polyaniline(PP)and LiBH_4,and the hydrogen sorption performance as well as catalytic mechanism of the composite was studied.It is found that the onset desorption temperature of the composite decreases to 75°C,almost 235°C lower than that of the milled LiBH_4.Moreover,the composite could release 4.1 wt%H_2and rehydrogenate a total of 4.4 wt%H_2when the temperature raiseds up to 400°C,showing an outstanding reversibility,which even 3.9 wt%H_2can be kept after five cycles.Through scanning electron microscopy(SEM)observation and X-ray diffraction(XRD)analysis,we found that the PP surface forms some nanoholes after hydrogenation-dehydrogenation cycles,which leads to the confinement of some LiBH_4in the PP nanoporous structure,therefore,the hydrogen sorption kinetics and reversibility are significantly enhanced.In addition,we also found the oxygenic groups of the PP can react with LiBH_4forming LiBO_2and Li_3BO_3,where the containing Li–B–O bonds loaded in the porous structure of the PP catalyze the hydrogenation reaction of LiBH_4.     

From proportion to balance: the background to symmetry in science

We call attention to the historical fact that the meaning of symmetry in antiquity—as it appears in Vitruvius’s De architectura—is entirely different from the modern concept. This leads us to the question, what is the evidence for the changes in the meaning of the term symmetry, and what were the different meanings attached to it? We show that the meaning of the term in an aesthetic sense gradually shifted in the context of architecture before the image of the balance was attached to the term in the middle of the 18th century and well before the first modern scientific usage by Legendre in 1794.     

de Sitter空间中的紧致2-调和类时子流形

利用活动标架法,得到了de Sitter空间中的紧致2-调和类时子流形的一个积分不等式以及该子流形成为极大类时子流形的关于其第二基本形式模长平方一个拼挤定理.     

Octopus mimicking its follower reef fish

We describe a possible example of social mimicry between Octopus insularis and the small grouper Cephalopholis fulva, which frequently associate during foraging at Fernando de Noronha Archipelago, Brazil. The octopus, when swimming backwards, jet‐propelled, becomes similar in colour and shape to accompanying C. fulva individuals and is therefore less conspicuous within the fish group. We regard this as an instance of social mimicry, a form of protection against visually‐oriented predators in which different species similar in shape and colour mingle for the advantage of grouping. Even when swimming backwards alone, O. insularis may become similar to foraging C. fulva individuals, another putatively protective behaviour. We suggest that the feeding association commonly found between O. insularis and C. fulva minimized the evolutionary costs for the origin of mimicking by the octopus.     

格式条款的立法规制简析——以中德比较法为视角

格式条款的立法规制是现代民法关注的重要问题。在大陆法系中,德国《民法典》对其的相关规定已十分完善。对比中德两国在格式条款的纳入和内容控制方面可以发现,我国立法不仅有重大的遗漏,而且有相互矛盾之处。可见,德国法对我国法有相当的借鉴意义。     

三维Minkowski空间中的伪球面曲线

在三维Minkowski空间中讨论伪球面曲线.首先给出Minkowski空间中伪球面曲线的Frenet标架,然后利用伪球面曲线的特殊性,给出它的一种新的Frenet标架形式,并进一步研究了该曲线为一些特殊曲线的情况.     

First record of Monobrachium parasitum Mereschkowsky, 1877 (Cnidaria: Hydrozoa) from Brazil,in the tropical southwestern Atlantic,and its implication for bipolarity concepts

Project HABITATS was recently initiated in the Campos Basin (20.5–24° S), state of Rio de Janeiro, to assess biological impacts of petroleum exploration and exploitation on the continental shelf and slope of Brazil. Among species discovered in benthic samples from the area is the hydroid Monobrachium parasitum Mereschkowsky, 1877, occurring in an epibiotic association with the pelecypod mollusc Mendicula ferruginosa (Forbes, 1844): this is the first report of an association between the two species. Monobrachium parasitum has always been reported from cold waters, and is generally considered bipolar. This report records the occurrence of M. parasitum at lower latitudes, where they have seldom been collected: it is also the first account of this species from South America and the southwestern Atlantic. Moreover, the bathymetric distribution of M. parasitum is extended to a depth of 998 m. No previous records exist of hydroids from the Brazilian continental slope.     

分裂四元数的棣莫弗定理

以分裂四元数的概念为依托,首先给出了分裂四元数的代数性质;其次,得到了不同情形下分裂四元数的棣莫弗定理和欧拉公式;进一步,依据所得棣莫弗定理,得到分裂四元数方程的求根定理,得出求分裂四元数的任意方幂的公式,并研究了分裂四元数不同方幂之间的联系;最后,给出分裂四元数的实表示矩阵的棣莫弗定理.利用数值算例验证了结论的正确性...