Ω＋Ω→（ΩΩ）Jπ=0＋＋X Cross section Calculation

The cross sections of Ω+Ω→(ΩΩ)_J^π=0⁺+X are studied by using an effective Hamiltonian method. The results are σ_{Ω+Ω→(ΩΩ)0⁺+γ}=0.03～0.16×10^-29 cm² for p_Ω=100～400 MeV, and the cross sections of η production are about 10^-28 cm² for p_Ω > 880 MeV.     

NUMERICAL SIMULATION OF THREE-DIMENSIONAL INCOMPRESSIBLE FLOW BY A NEW FORMULATION

A new mathematical formulation, called the pseudovorticity–velocity formulation, of the three-dimensional incompressible Navier–Stokes equations is presented as an alternative to the vorticity–velocity approach. For the model lid-driven cavity flow problem in two and three dimensions, combined with an explicit mixed spectral /finite different numerical scheme the proposed formulation is found to be efficient and very accurate as compared with the results available in the literature. In particular, the simulation results demonstrate an attractive feature of the present formulation compared with the vorticity–velocity approach, namely that the divergence-free condition of the velocity field can always be achieved on a non-staggered mesh.     

银袋内酯乙的乙酰化物的晶体结构和分子结构

本文报道从变色马兜铃(Aristolochia versicolar)的块根中提取的一种新倍半萜内酯-银袋内酯乙的乙酰化物的晶体结构和分子结构.分子式为C~17H~22O~4,分子量290.4,晶体属单斜晶系,空间群为P2~1,a=0.9594(5),b=0.6626(6),c=1.2924(12)um,β=94.48(6)`,V=0.819(1)nm^3,Z=2,Dx=1,18g.cm^-^3,F(000)=266e,μ=0.77cm^-^1(MoKa).结构用直接法解出,经最小二乘法修正后1280个衍射点偏离因子为R=5.5%,Rw=5.2%.分子由椅型.椅型的1,5二烯十员环([2323]矩形)和共用两个相邻DunitzIII型碳C(4),C(5),一个Dunitz II型碳C(6)的五员内酯环组成.十员环与五员内酯环之间夹角为99.该分子骨架拓扑在迄今已知的倍半萜内酯中只与银袋内酯丙相似.所有非氢原子的键长和键角均在实验误差范围内接近理论值。     

基于三苯胺和咔唑的联吡啶铱化合物的合成及其在光催化水产氢中的应用研究

以三苯胺、咔唑、4,4′-二羧基联吡啶为原料,设计并合成了两个联吡啶铱（III）配合物Ir1和Ir2,其结构经¹H NMR, ¹³C NMR和HR-MS(MALDI-TOF)表征。并利用紫外可见光谱（UV-Vis）、荧光发射光谱（Photoluminescence）和循环伏安法研究了化合物的光学和电学性质。结果表明：Ir1和Ir2的紫外可见光吸收波长分别位于456 nm 和448 nm,相应的发射波长分别为645 nm和678 nm,说明其均能利用可见光; Ir1和Ir2的HOMO电位为-5.125~-5.510 eV, LOMO电位为-2.880~-0.310 eV,满足作为光敏剂的基本条件。研究了化合物在可见光照射下光催化水分解产生氢气的效果。结果表明：Ir1和Ir2的氢气值TONs(turnover numbers)达到2 827和1 908。     

α-Carbonyl Radical Cyclizatio n in Organic Synthesis

Intramolecular radical cyclization reactions are now used routinely to synthesize carbocyclic and heterocyclic structures. We have reported that α-carbonyl radicals 1, generated from the corresponding iodo ketones or enones, underwent intramolecular radical cyclization smoothly to afford products 2.1, 2,3     

LIOUVILLE RESULTS FOR STABLE SOLUTIONS OF QUASILINEAR EQUATIONS WITH WEIGHTS

This paper is devoted to the quasilinear equation ■where p 2,Ω is a(bounded or unbounded) domain of R~N,w_1,w_2 are nonnegative continuous functions and f is an increasing function. We establish a Liouville type theorem for nontrivial stable solutions of the equation under some mild assumptions on Ω,w_1, w_2 and f, which extends and unifies several results on this topic.     

Development of an RPLC-based Method for Measurement of Indoprofen Stability and Validation of the Method

A method for quantitative measurement of the photochemical decomposition of the anti-inflammatory agent, indoprofen （INP） is descriped. An RPLC-based assay that could determine the extent of degradation of INP in a rapid, sensitive, and accurate manner was developed. The method was validated under photoirradiation. Quantitation was monitored with an Inertsil ODS-3V column using a mobile phase of acetonitril and 1% HOAc solution in deionized H2O. Statistics relevant to the system criteria, peak integrity and resolution among the parent drug and its degradation products were performed. From the intra- and inter-day tests, the coefficients of variation were found to range from 0.59% to 4.25% for the former and from 0.71% to 4.86% for the latter. The good selectivity and specificity of this RPLC-based procedure render it suitable for measurements of INP stability.     

跳跃机构与低渗杂半导体杂质电导

在渗杂度很低时,由于少数杂质电离后引起场的起伏,电子在杂质上主要处于局域状态,电声子作用使电子能够在不同杂质上跳跃,但由于电子坐标算符与电声子作用交换,在电场中电子的运动实际上是一种击穿效应,而由声子束补偿能量。针对低补偿情况,略去复杂能带结构,我们由刘维方程出发,把密度矩阵对电场,然后对电声子作用展开,得到电流表达式及密度矩阵对角元所满足的玻茲曼型方程.只取到重迭积分二次项,我们得到了Miller等的网络方程,可以简单地求出平均阻抗,在低温极限下,得到σ～e^{(-βε_{(Be-1.54(rd/a)3/2))}}N_A^1/8,βε₃=βe²/(εr_d) -1.93(βE_A)^3/4。借助网络模型,我们分析了密度矩阵各部分的贡献,特别是与通常输运过程的差别。最后利用Anderson的结果,若K<10^-2,在对电导起主要作用的链上,在Ge,Si中浓度要在10¹⁴及10¹⁶cm^-3以下才能形成局域态,我们认为,考虑了电子间库仑作用后,载流子非局域并不与目前实验矛盾。 关键词：     

检验π介子散射过程是否存在p态共振的一个实验方法的建议

An Experiment designed the p-resonance in π-π scattering process is suggested.     

AN EXPLANATION TO THE INCONSISTENT PHENOMENON BETWEEN MEAN MULTIPLICITY AND AVERAGE TRANSVERSE MOMENTUM IN COSMIC RAY EXPERIMENTS WITH SUPERHIGH ENERGY OF E > 1015 eV

The rapid increase of both and T> as S increases in superhigh energy cosmic ray experiments manifests some inconsistencies with the 1> ≤ π/4 S^1/2 rule. It is shown that these inconsistencies can be weakened with the assumption that only the secondary particles of the small fireballs are measured in the Ashtonsr experiment ^[3], but still not removed.