态|Ψ(3)〉q中广义磁场的不等幂次高次振幅压缩

利用多模压缩态理论,研究了一种新型的三态叠加多模叠加态光场|Ψ⁽³⁾〉_q中广义磁场分量(即第一正交相位分量)的不等幂次高次振幅压缩特性.结果表明:态|Ψ⁽³⁾〉_q是一种典型的三态叠加多模非经典光场,其广义磁场分量在一定条件下可呈现出周期性变化的、偶数次的不等幂次高次振幅压缩效应.     

High repetition rate pulsed laser of twin wavelengths from KTiOPO4 optical parametric oscillation

In this paper, some key techniques of KTiOPO_4 optical parametric oscillation (OPO) laser with repetitive frequencies and twin wavelengths output have been analysed theoretically and studied experimentally in detail. An intracavity optical parametric oscillator (IOPO) has been applied. Operating under 20Hz, laser output energy of more than 38mJ with twin wavelengths 1.57μm and 1.06μm has been achieved. Results of the experiments agree well with the theoretical discussion.     

Teachers' funds of knowledge and the teaching and learning of mathematics in multi-ethnic primary schools: Two teachers' views of linking home and school

In this paper we explore two teachers' views on the role(s) of parents, the local community and children's home lives in the learning of mathematics in primary school. We use Moll and Greenberg's concept of ‘funds of knowledge’ and apply it to the case studies of two teachers working in the UK context. Issues of teachers' professional experience, ethnicity, class and gender emerge as significant in examining similarities and differences in the teachers' beliefs, understandings and practices in the area of linking home and school. We end with a discussion of some implications for teacher education and professional development.     

KT-5C托卡马克上不同限制器偏压下等离子体p约束改善的实验研究

在KT-5C托卡马克上,采用多块组合的可偏压限制器控制等离子体边缘电场.进行了改善等离子体的边缘参数及其机制的研究.实验显示,限制器的正、负偏压都能改变等离子体电位,但正偏压更有效,能有效地建立边缘电场,进而抑制边缘扰动改善等离子体约束.利用可移动静电探针,测得正偏压期间边缘电子温度T_e(r)、电子密度n_e(r)、空间电位V_p(r)分布变陡,与计算得到的边缘粒子通量Г(a_(?))减少,整体粒子约束时间τ_p增加结果是一致的.     

新疆××金矿主要矿物的标型特征及其意义

摘要黄铁矿的反射率均低于标准黄铁矿。含金黄铁矿的晶胞参数a_0为5.4170A—5.4175A、热电系数为正值。在600—200(cm~(-1))波数内,红外光谱曲线的吸收谷较为开阔,且随含金量的增加有向长波方向产生系统位移的趋势。在其求I矿,氧、氢和碳的同位素丰度是:δO_(SiO_2)~(18)11.93—16.3‰、δO_(H_2)~(12)O-1.06—4.34‰、δD—84.4—-128.8‰、δC~(13)-12.92—-17.22‰。在石英的包裹体气相中,CH_4/CO_2值为0.009—0.056,在液相中,l_7矿脉富K~+,l_(17)矿脉的K~+、Na~+相等,其它均为富Na~+型。离子组合及矿化度与岩体一致,矿化度属淡水型。文中还提出了说明矿床成因的地质年龄、化探成果、稳定同位素和流体包裹体成分的依据,补充了找矿评价的硫化物存在、黄铁矿的热电系数和红外谱标志。     

Numerical simulation of the flow field in a reactor for titanium dioxide production

A physicochemical and fluid dynamic model is formulated for the numerical simulation of the flow field in a reactor for titanium dioxide production, the turbulence motion is described by theKε equation, the governing equations are solved by the SIMPLER algorithm devised by Partankar and Spalding. The velocity, tmperature and concentration fields are obtained for three cases: A) with chemical reaction and thermal insulation on the walls; B) with chemical reaction and wall temperature is 450K; C) without chemical reaction and thermal insulation on the walls, and the physicochemical numerical simulation for the titanium dioxide production has been done. The results of the paper can be used as a theoretical guide for the engineers in the design of such reactors.     

Potooxygenation of nitroaromatic compounds. Catalytic effects in the reaction of molecular oxygen with nitrobenzyl derivatives.

The photooxygenation reaction of several nitroaromatic compounds ($\text{1}$ - $\text{8}$) in aqueous solution is described, the mechanism of reaction is believed to involve photogenerated nitrobenzyl carbanions.     

高速CCTS光双稳激光器的研究

从速率方程出发对双区共腔（ｃｏｍｍｏｎ－ｃａｖｉｔｙｔｗｏｓｅｃｔｉｏｎ简称ＣＣＴＳ）光双稳激光器进行了精确的理论分析与计算，并对其稳态特性进行了实验研究和测试，得出了定量和定性的分析结果，同时还首次发现当激光输出高态出又出现了一次光双稳和开关效应。经研究确认是量子阱探测器的自电光效应，并提出一种可集成双逻辑功能显示的新型网络模型器件。     

Electron spin resonance and kinetic study of the photolysis of p-Flouranil (tetrafluoro-p-benzoquinone) in dioxane

The photochemistry of p-fluoranil in dioxane was studied by electron spin resonance (ESR) and the ESR-rotating sector technique. The transient photoradical is identified as the p-tetrafluorobenzosemiquinone neutral radical with a hyperfine splitting of 1.1 gauss for the hydroxy proton and the fluorine hyperfine splittings of 3.8 and 14.1 gauss for the meta and ortho fluorines, respectively. The radicals decayed by self-disproportionation with a second-order rate constant at room temperature of approximately 3.2 × 10⁹M^?1s^?1. The activation energy of the decay process is found to be about 2.4 ± 0.4 kcal/mole.     

Automorphisms of the Projective Quaternion Unimodular Group of two Dimensions

Let K be the skew field of rational quaternoions.Let R={(a+bi+cj+dk)/2|a,b,c,d =in Z and have the same parity},where Z denotes the ring of rational integers.R is a subring of K and K is the quotient skew field of R. R is usually called the ring of quaternion integers. Let E denote the subgroup of GL_2(R) generated by all elements of the form $[\left( {\begin{array}{*{20}{c}} 1&s\0&1 \end{array}} \right)\]$ and $[\left( {\begin{array}{*{20}{c}} 1&0\t&1 \end{array}} \right)\]$(s,t \in R).Denote the factor groups of GL_2(R) and E modules their centers,both of which are {\pm I},by PGL_2(R) and PE respectively.PE is the commutator subgroup of PGL_2(r). Theorem.Any automorphism of PGL_2(R) (or PE) is one of the following two standard forms $\bar A \mapsto \bar P{\bar A^\sigma }{\bar P^{ - 1}}$ $[A \mapsto \bar P{(\overline {{A^{\tau '}}} )^{ - 1}}{\bar P^{ - 1}}$ where $\bar P \in PGL_2(R)$,\sigma is an automorphism of R and \tau is an anti-automorphism of R.