蒸汽滴状冷凝演变和液滴生长方式的研究

蒸汽的滴状冷凝进程中,液滴生长包括冷凝生长与合并生长。液滴生长作为影响滴状冷凝演变的关键行为,其研究有助于深入理解滴状冷凝演变机制和换热机理。本文基于滴状冷凝全过程的数值模拟,针对不同凝结核密度下的滴状冷凝演变和液滴生长方式开展研究。模拟中采用Cassie模型对液滴的冷凝生长进行描述,耦合邻近搜索算法和守恒定律对液滴的合并生长过程进行模拟。经实验结果和理论模型验证,本文模拟方法具有较高的可靠性。结果表明：最大液滴尺寸主要来源于合并生长,其增速是衡量滴状冷凝演变速度的表征;随着凝结核密度的升高,演变速度呈线性提高,换热能力先增后减;高合并频率的表面能有效提高合并生长对最大液滴尺寸的贡献比例。     

《分析化学》2006年出版网络英文版

为了加快期刊的国际化进程，扩大国际交流，本刊与国际知名的出版公司爱思唯尔（Elsevier）达成协议，合作出版英电子版Chinese Journal of Analytical Chemistry，该刊与中版同步（月刊）。出版后置于爱思唯尔庞大的ScienceDirect网络出版平台上。     

非线性方程的多进程异步并行Newton法

本文通过引入多个进程,得到一种新的异步并行Ｎｅｗｔｏｎ法．并分析了该新算法的实现过程,得出了理论上的计算公式．     

Ruin probability for correlated negative risk sums model with Erlang processes

This paper studies a Sparre Andersen negative risk sums model in which the distribution of ＂interclaim＂ time is that of a sum of n independent exponential random variables. Thus, the Erlang（n） model is a special case. On this basis the correlated negative risk sums process with the common Erlang process is considered. Integro-differential equations with boundary conditions for ψ（u） are given. For some special cases a closed-form expression for ψ（u） is derived.     

Catalytic Membranes and Membrane Reactors： An Integrated Approach to Catalytic Process with a High Efficiency and a Low Environmental Impact

The design of new heterogeneous photooxygenation systems able to employ visible light,oxygen,mild temperatures,and solvent with a low environmental impact has been investigated. In particular,the heterogenization of decatungstate (W10O4-32),a polyoxometalate with photocatalytic activity in oxidation reactions,has been carried out in polymeric membranes of polyvinylidenefluoride. The polymeric catalytic membranes prepared by phase inversion technique have been successfully applied in the aerobic mineralization of phenol in water,which was used as an example of organic pollutant. In order to evaluate the effect of the polymeric environment on the overall catalyst behavior,we have also heterogenized the decatungstate (opportunely functionalized) in perfluorinated membrane made of Hyflon. The photocatalytic composite membranes are characterized by different and tuneable properties depending on the nature of the polymeric micro-environment,in which the catalyst is confined. Moreover,the selective separation function of the membrane results in enhanced performance in comparison with homogeneous reactions.     

基于进程行为的防沉迷模型

防沉迷系统监控的软件大多是娱乐型软件,如游戏、视频、音频等,传统的防沉迷系统一般仅针对软件使用者的身份加以鉴别和监管,对软件本身的行为不作分析。对于此类娱乐进程运行时表现出来的行为特征,提出一种基于进程行为分析的娱乐进程监控系统模型。动态收集进程运行时产生的行为数据,通过基于迭代、分类、阀值比较的识别算法来判定出娱乐进程,进而对其使用时间进行监控。通过收集的数据和测试实验,验证该模型的可行性和有效性。     

Hadro- and photo-production of η′ in quasi-free proton and neutron processes

The η′ photoproduction process on quasi-free proton and neutron and the reaction NN→ η′NN are investigated within a relativistic effective Lagrangian approach to hadronic interactions. Resonances with spins 1/2 and 3/2 are considered together with the nucleonic and t-channel meson-exchange current contributions. In photoproduction processes, the S11 resonance is found to be responsible for the sharp rise of the cross sections near threshold. In pp → η′pp, it is found that the S11 resonance dominates the total cross section over the entire energy region considered. The spin observables, in particular the beam and target asymmetries, are shown to be very sensitive to the reaction mechanism and will help impose more stringent constraints on the model parameters.     

Synthesis,Crystal Structure,Magnetic Property and DFT Study of a Novel 2D Polymer [Cu(pdc)(bpy)]·H_2O

A new copper complex [Cu(pdc)(bpy)]·H2 O(1, H2 pdc = 3,5-pyridinedicarboxylic acid, bpy = 2,2-bipyridine) has been solvothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, UV-vis spectroscopy and magnetic measure- ments. Complex 1 crystallizes in monoclinic system, space group P21 /c, a = 10.893(2), b = 7.3641(15), c = 1.9921(4), β = 92.16(3), V = 1596.9(6)3, Dc = 1.676 g/cm3, Mr = 402.84, Z = 4, F(000) = 820, μ = 1.404 mm-1, the final R = 0.0237 and wR = 0.0693. The Cu(II) ion is five-coordinated by two O atoms from two pdc ligands, one N atom from another pdc ligand and two N atoms from the bpy ligand. The pdc anion, which acts as a tridentate ligand, links three Cu ions, forming(3,3)-connected two-dimensional(2D) sheets. We also studied the electronic structure and orbital energies of complex 1 by DFT methods, and the results are consistent with UV-vis spectrum.     

Ab-initio Investigation on Ion-associated Species and Association Process in NaNO3 Solution

<正>Some ion-associated species existed possibly in NaNO_3 solution were investigated via the ab-initio method. The hydrated ion parings,triple and multiple ion clusters in NaNO_3 solution are all analogous to those in Mg(NO_3)_2 system except that the bi-dentate structures can not be formed.Only one solvent-shared ion paring has larger v_1-NO_3~- frequency than the hydrated NO_3~- ion.And all triple clusters with two hydrated Na~+ ions and one NO_3~- have larger v_1-NO_3~- frequency than the hydrated NO_3~- ion.The ion association process in NaNO_3 solution is predicted as free ions→solvent-separated ion pairings→solvent-shared ion pairings→solvent-shared triple ion clusters→contact triple ion clusters→contact multiple ion clusters→amorphous NaNO_3,which is not analogous to that in MgSO_4 but those in Mg(NO_3)_2 and Mg(ClO_4)_2 systems.     

学科融合：由X射线晶体学揭示的生命进程中的化学基础

这篇文章是为国际化学年而写的总结.化学主导了几乎所有现代科学的分支,因为一旦深入到了分子水平上,就会涉及到化学事件.在生命科学领域里面,传统科学分支之间的界限实际上已经消失了,所以几乎所有的生物学问题都是以化学术语回答的.