告作者

为适应我国信息化建设需要,实现科技期刊编辑、出版、发行工作的电子化,推进科技信息交流网络化的进程,扩大作者学术交流渠道,本刊已加入《中国学术期刊(光盘版)》和"中国期刊网"。     

分析化学网络教学系统的开发

分析了分析化学网络教学系统开发的现状及应用价值,提出了开发分析化学网络教学系统的理念,较详细地介绍了所开发系统的主要结构和特点。     

一类基于集合种群网络的传染病模型研究

研究了一类基于集合种群网络的传染病模型.针对在疾病传播过程中,随着染病者数量的增加,被感染的人数会达到饱和,研究了带有饱和发生率的传染病模型,建立了不同集合种群之间扩散模式,并分析了模型动力学的性态,给出了无病平衡点及其稳定性和正平衡点的存在性.最后用数值模拟验证了理论结果的正确性.     

关于《光谱学与光谱分析》收取审稿费的通知

正尊敬的《光谱学与光谱分析》广大作者、读者同志们,本刊自2006年底采用由"北京玛格泰克科技发展有限公司"开发的投稿系统实现网络采编以来,进一步扩展了审稿专家队伍。本刊参考同类期刊的现行做法,决定自2010年12月1日以后登记的稿件向投稿作者收取审稿费100元/篇,在您投稿之前,为免受经济损失,请您必须考虑:1.没有创新的一般性稿件,请您不要投稿。2.没有国家级基金资助的稿件,请您不要投稿。3.不是光谱专业的稿件,请您不要投稿。     

多元化教学模式在大学物理教学中的探索与实践

大学物理课是理工科高等院校的一门重要公共基础课,它对于培养学生的科学素养、提高学生分析问题和解决问题的能力、协调理论知识与提高动手能力具有其他课程不能替代的重要作用,以往的教学中存在“重理论、轻应用”“重模型、轻推导”的传统倾向,同时高考课改使得受教育群体的物理知识体系多元化.为此,本文探索了新的有效的教学模式,首先分析了大学物理的教学现状,然后根据大学物理的教学目标,讨论了基于多元化教学模式的大学物理的教学改革途径.     

基于极化-空间模超纠缠的量子网络多跳纠缠交换方法研究

基于纠缠交换方法进行多跳量子信息传输,是实现远距离量子网络通信的基本方式之一.传统的多跳量子网络通常使用单自由度极化光子纠缠态作为量子信道,信息传输容量较低且容易受到噪声的干扰.本文提出一种基于超纠缠的高效量子网络多跳纠缠交换方法,利用极化-空间模式两自由度的纠缠光子,建立超纠缠量子多跳信息传输通道.以远程超纠缠隐形传态的信道建立需求为例,首先给出了基础的逐跳超纠缠交换方案,为降低该方案的端到端超纠缠建立时延,提出在中间量子节点进行同时测量的并行超纠缠交换方案.在此基础上,为降低并行超纠缠交换的经典信息开销,进一步提出一种分级并行超纠缠交换方案.理论分析及仿真结果表明该方案的纠缠建立时延接近于并行超纠缠交换方案,但可以减少经典信息传输量,在一定程度上实现两者的平衡.相比传统的纠缠交换方法,本文方案有利于解决远程超纠缠通信的需求,对未来构建更高效率的量子网络有积极意义.     

MARKOV SKELETON PROCESS IN PERT NETWORKS

In this article, we investigate Programming Evaluation and Review Technique networks with independently and generally distributed activity durations. For any path in this network, we select all the activities related to this path such that the completion time of the sub-network （only consisting of all the related activities） is equal to the completion time of this path. We use the elapsed time as the supplementary variables and model this sub-network as a Markov skeleton process, the state space is related to the subnetwork structure. Then use the backward equation to compute the distribution of the sub-network＇s completion time, which is an important rule in project management and scheduling.     

《无机化学学报》投稿须知(NOTICE TO AUTHORS)

<正>《无机化学学报》是中国化学会主办的学术期刊,面向国内外发行。主要报道我国无机化学领域的基础理论和应用基础理论研究成果,促进国内外学术交流,繁荣无机化学学科。它涉及的内容有固体无机化学、     

Broadband Convergence of 40 GHz-ROF and 10-Gb/s WDM-PON Systems in the Duplex Access Network

A broadly converged 40G-ROF and 10-Gb/s WDM-PON multi-service access system is proposed and exper- imentally demonstrated. This scheme consists of an integrated system of 40G-ROF and 10-Gb/s WDM-PON simultaneously transmitting independent 2.5-Gb/s wireless and 10-Gb/s wire signal. At the base station, it employs a remodulation scheme, which is achieved by remodulating the upstream OOK signal on the DPSK downstream signal, to reduce the cost of the base station. The transmission experiment is carried out over a 25-km-long single mode fiber （SMF-28）. The results show that the sensitivities of downstream PON and ROF signal are -14.5 dBm and -21.5 dBm, respectively, and the sensitivity of upstream signal is -25.3 dBm.     

A 2D Lanthanide-organic Framework Based on Inorganic Lanthanum（Ⅲ） Sulfate Skeletons：Synthesis,Structure,and Luminescence and Thermal Properties

A new lanthanum coordination polymer formulated as {[La2(pyda) 2(μ4-SO4) ·5H2O]· 2H2O}n(1,H2pyda = 2,6-pyridine-dicarboxylic acid) has been synthesized from the reaction of H2pyda with lanthanide nitrate in the presence of sulfate as a counter anion. The compound was characterized by elemental analysis,IR spectroscopy and X-ray single-crystal diffraction. It crystallizes in the orthorhombic system,space group Pna21,with a = 18.8558(19) ,b = 6.5831(7) and c = 18.7543(19) . The compound is a 2D hybrid,in which the La(Ⅲ) ions were doubly connected by the carboxylic group of pyda2-ligand to form the La(Ⅲ) dimer followed by being grafted into 1D zig-zag chains which are further connected into a 2D network containing {[La(SO4) ]+}n helical chains. The interchain hydrogen bonding and π-π stacking interactions extended the 2D networks into a 3D supramolecular edifice.