Wormhole solution in Bergmann-Wagoner scalar-tensor gravitational theory

We give a Euclidean wormhole solution in the vacuum Bergmann-Wagoner scalar-tensor gravitational theory. We show that this wormhole, unlike others, has complex charge and is a baby universe (half a wormhole).     

退火处理对SnO2薄膜光致发光性质的影响

实验研究表明,SnO2薄膜经过退火处理后其光致发光谱有明显的变化。在氧和氮两种不同气氛中进行热处理,其变化也有差异。这种变化主要是由于SnO2膜中氧空位和自由载流于浓度变化所致。     

N,N′-乙二水杨酰胺合铜(Ⅱ)酸根的Cu(Ⅱ)-Co(Ⅱ)配合物的合成与磁性

本文报道了2个新的Cu(Ⅱ)-Co(Ⅱ)双核配合物的制备。经元素分析和红外、电子光谱以及变温磁化率的测定,研究了配合物的某些性质。     

应用晶体结构数据进行化学反应途径研究 Ⅰ. 五配位钼化合物Mo(L)5的动态立体化学

The principle of structure correlation is applied to 28 crystal structures which contain 44 different five-coordinate molybdenum fragments. The data derived map the reaction pathway for a bimolecular ligand substitution reaction at tetrahedral molybdenum centers. The dihedral-angle method from Muetterties and Guggenberger is employed in order to describe the interconversion between the trigonal bipyramidal (TBP) and the square pyramidal (SQP) conformations via the Berry pseudorotation mechanism in the system of Mo(L)_5 complexes. This structure correlation method provides a convincing mapping of the Berry pathway in this paper.     

Synthesis and magnetic properties of copper(II)-MII-copper(II) trinuclear complexes with N,N′-bis(2-aminoethyl)oxamidocopper(II) [M = Co and Ni]

Summary Two novel trinuclear complexes were prepared, namely [Cu₂(oxae)₂(H₂O)₂M] (ClO₄)₂, [oxae = N,N-bis(2-aminoethyl) oxamido dianion; M = Co and Ni]. Based on elemental analyses, conductivity measurements and i.r. spectra, the complexes are proposed to have extended oxamidobridged structures. The magnetic susceptibility of [Cu₂-(oxae) ₂(H₂O)₂Co](ClO₄)₂ were measured over the 4–300 K range and the observed data were successfully simulated by an equation based on the spin Hamiltonian, =–2J(₁·₂·₂·₃). The exchange integral, J, was found to be equal to –29.2 cm^–1, indicating an antiferromagnetic spin-exchange interaction between the adjacent metal ions.     

红外镜反射光谱的测试与解析

红外镜反射（infrared specular reflection，简称SR）光谱与被测样品和衬底的折射指数、吸收指数以及入射角有密切关系，往往由之产生畸变。要从红外镜反射技术测得的光谱处理得到人们熟悉的吸收光谱，需要经过较复杂的计算机数学处理。本文通过几个比较特殊的镜反射例子，以说明镜反射光谱的测试和解析必须注意多种影响因素。     

Cyanex272-P507浸渍树脂协同萃取色层分离铥镱镥的研究

以Cyanex272-P507浸渍树脂采用萃取色层法对铥镱镥富集物进行了吸附和淋洗分离研究,考察了淋洗剂浓度、稀土负载量、淋洗液流速等因素对分离铥镱镥富集物的影响。结果表明,在充填的树脂粒度为0.3~0.6 mm的色层柱中,以0.2 ml.cm-2.min-1进料流速时能得到较大的吸附率;在稀土负载量为树脂重量的0.6%,淋洗液流速为1.0 ml.cm-2.min-1,温度为30℃,装柱树脂高度为400 mm(高径比为25∶1)的条件下,用1.0,1.5,2.0 mol.L-1盐酸梯度淋洗Tm,Yb,Lu,可实现铥镱镥富集物三者的完全分离。     

高纯度植酸的制备

高纯度植酸的制备孙定光胡佩廖显威（四川师范大学化学系成都６１００６６）关键词植酸制备高纯试剂中图分类号Ｏ６２９．９植酸（ＰｈｙｔｉｃＡｃｉｄ）又名肌醇六磷酸酯，分子式：Ｃ６Ｈ１８Ｏ２４Ｐ６，结构为植酸是中等强度的有机酸，因其结构特殊，具极强的螯合作用...     

Microwave-accelerated derivatization processes for the determination of phenolic acids by gas chromatography-mass spectrometry

A rapid method for the derivatization of phenolic antioxidants using microwave irradiation has been developed. Six antioxidatively active phenolic components of wines and fruits, namely gallic acid, gentisic acid, vanillic acid, caffeic acid, ferulic acid and p-coumaric acid were used in the model study. The solution of phenolic acids was evaporated to dryness on a rotary evaporator followed by further drying under microwave irradiation (600 W, 30 s). The resultant residue was dissolved in pyridene and treated with bis(trimethylsilyl)acetamide while irradiated by microwave using high power for 30 s. Controlled reaction was carried out employing bis(trimethylsilyl)trifluoroacetamide under conventional heating for 30 min. The trimethylsilyl derivatives were identified and quantified on a gas chromatography/mass selective detector. The mass spectral fragmentation patterns of the derivatives obtained by microwave irradiation were identical to those prepared by heating. The yields of microwave-assisted silylation were comparable to those from conventional heating. The rsd were less than 8% for six replicates. The linearity in wine matrix was nearly perfect. This method is a useful protocol to examine the phenolic constituents in wines and agricultural products.     

新工科项目“地方(行业)高校化学类专业应对产业变化的升级改造研究与实践”的实施

This "emerging engineering education (3E)" project "Upgrade and Practice of Chemistry-related Majors of Local and/or Specialized University Responding to the Industry Changes" was supported by the Ministry of Education. To aim at the issue of how to upgrade the chemistry-related majors of a local and/or specialized university responding to industry changes, an investigation on local regional economy and industry changes was carried out, the capability requirements of 3E for talents were analyzed, and the training objectives, graduation requirements as well as the new teaching models were also studied for the major to meet the future requirements. The practical experience for 3E construction of chemistry-related majors by selected universities was suggested.