不对称合成中手性磷配体催化剂的研究进展（I）（待续）

评述了作为配体催化剂的手性三配位及四配位磷化合物的合成及其在某些不对称的合反应中的应用。     

海南岛红土风化壳的矿物成分及其形成机理

本文论述海南岛北部早更新世玄武岩上发育的两类红土风化壳的矿物成分及其形成机理。文章首先叙述了不同风化带矿物成分的特点,然后在研究风化岩石显微组构特征的基础上,探讨了微区的三个主要物理化学过程(假象交代、溶蚀和淀积作用)以及微区水动力条件对这些过程的影响。最后提出了本区玄武岩红土化过程中的矿物风化序列。     

几个三角公式、定理的几何解释

把两个斜边分别为a、b的直角三角形按如图所放．     

电子膨胀阀对电动汽车空调系统的调节特性研究

电子膨胀阀是电动汽车空调系统的主要调控部件,探究其调节特性对于制定系统控制策略具有重要意义.本文搭建了以R134a为制冷剂的电动汽车空调系统实验台,研究了电子膨胀阀调节过程中,空调系统内制冷剂流量和压力的动态变化规律,分析了不同压缩机转速下,阀开度对系统制冷量、空调箱出风温度、压缩机功耗和系统COP等性能参数的影响.结果表明：阀前制冷剂相态是影响电子膨胀阀调节时系统压力变化强弱的重要因素.在阀前制冷剂为过冷液态时,调节阀开度对系统压力影响更大,并且在阀前制冷剂具有较大过冷度(大于10℃)时,下调阀开度会导致短时间的过节流造成系统压力大幅波动;系统中制冷剂循环流量与阀开度呈线性变化趋势,不受阀前制冷剂相态的影响.在实验工况下,100%阀开度对应的制冷剂循环流量为97.2～115.5 kg/h,阀开度每下调10%,系统中制冷剂循环流量下降6%～9%.     

Raman Spectrum of Epitaxial Graphene on SiC （0001） by Pulsed Electron Irradiation

We report new Raman features of epitaxial graphene （EG） on Si-face 4H-SiC prepared by pulsed electron irradiation （PEI）. With increasing graphene layers, frequencies of G and 2D peaks show blue-shifts and approach those of bulk highly-oriented pyrolytic graphite. It is indicated that the EG is slightly tension strained and tends to be strain-free. Meanwhile, single Lorentzian line shapes are well fitted to the 2D peaks of EG on SiC（O001） and their full widths at half maximum decrease with the increasing graphene layers, which indicates that the multilayer EG on Si-face can also contain turbostratic stacking by our PEI route instead of only AB Bernal stacking by a traditional thermal annealing method. It is worth noting that the stacking style plays an important role on the charge carrier mobility. Therefore our findings will be a candidate for growing quality graphene with high carrier mobility both on the Si- and C-terminated SiC substrate. Mechanisms behind the features are studied and discussed.     

The He--McKellar--Wilkens effect for spin-1 particles on non-commutative space

By using star product method, the He-McKellar-Wilkens （HMW） effect for spin-one neutral particle on noncommutative （NC） space is studied. After solving the Kemmer-like equations on NC space, we obtain the topological HMW phase on NC space where the additional terms related to the space-space non-commutativity are given explicitly.     

COMPOSITION OF MINERALS AND THEIR FORMATION MECHANISM OF LATERITIC WEATHERING CRUST IN HAINAN ISLAND

This paper discusses the composition of minerals and their formation mechanism of two types of the lateritic weathering crust on Early Pleistocene basalts in the northern part of Hainan Island. At first, the mineralogy of various weathering zones is described. Then, three main physicochemical processes in microscopic range (replacement as pseudomorph, dissolution and illuviation) and the effect of hydrodynamic conditions in the same range on these processes are inferred on the basis of the study of microfabric characters of the weathered rocks. Finally, weathered sequence of minerals in the lateritic processes of basalts is proposed.     

强可识语言族

<正> ∑为一有限集,∑~*表示∑生成的自由单子,∑~*的元素与子集分别称为∑上的字与语言,2~(∑~*)表示∑~*的幂集,(?)(∑)=2~(∑~*)-{(?)}的子集称为∑上的语言族.在人工智能中一些问题的推动下,1974年 Havel 等人开创了语言的分支代数结构的研究.Havel 在[1]中定义了有限分支自动机,从而导致了作为有限分支自动机识别的所谓可识语言族的研究;Havel 在[2]中又引进了语言的相似度概念,进而定义了语言之间的一种距离,使((?)(∑),d)成一距离空间;[2]中还定义了语言族的一种替换性,并证明了,语言族是自相容的,当且仅当它具替换性且为(?)(∑)中的闭集.     

Spin-1/2 relativistic particle in a magnetic field in NC phase space

This work provides an accurate study of the spin-l/2 relativistic particle in a magnetic field in NC phase space. By detailed calculation we find that the Dirac equation of the relativistic particle in a magnetic field in noncommutative space has similar behaviour to what happens in the Landau problem in commutative space even if an exact map does not exist. By solving the Dirac equation in NC phase space, we not only obtain the energy level of the spin-1/2 relativistic particle in a magnetic field in NC phase space but also explicitly offer some additional terms related to the momentum-momentum non-commutativity.