活性氯—过氧化氢氧化光泽精发光的研究

通过研究光泽精—H_2O_2和光泽精—ClO~-—H_2O_2化学发光反应的动力学曲线、吸收光谱以及化学发光光谱,提出了光泽精—ClO~-—H_2O_2化学发光反应的机理.还就温度和反应试剂的浓度对化学发光强度的影响进行了试验和讨论.     

树木模拟的粒子系统模型及其实现

以树木的静态造型为背景，提出一种基于骨架定制和粒子系统模型的树木模拟方法．内容包括基于粒子系统方法的树木形态结构描述与生成，基于粒子系统模型的树木生长模拟，以及由粒子系统法生成的树木模拟结果和进一步的工作设想等．     

轮胎行业科技术语的汉译研究——以德国大陆马牌轮胎公司翻译实践为例

着重研究轮胎行业科技术语的特征,包括专业术语数量多、普通词语专业化、专业交叉性术语多、广泛使用缩略语、连字符构成的术语多、术语意义引申多,同时结合实例(大陆马牌公司的翻译实践)探讨相应的翻译策略,包括对照术语表及查阅词典、利用平行文本、代入具体的文本和语境、增译。     

A new lysozyme from the eastern oyster (<Emphasis Type="Italic">Crassostrea virginica</Emphasis>) indicates adaptive evolution of <Emphasis Type="Italic">i</Emphasis>-type lysozymes

A new lysozyme (cv-lysozyme 2) with a MALDI molecular mass of 12 984.6 Da was purified from crystalline styles and digestive glands of eastern oysters (Crassostrea virginica) and its cDNA sequenced. Quantitative real time RT-PCR detected cv-lysozyme 2 gene expression primarily in digestive gland tissues, and in situ hybridization located cv-lysozyme 2 gene expression in basophil cells of digestive tubules. Cv-lysozyme 2 showed high amino acid sequence similarity to other bivalve mollusk lysozymes, including cv-lysozyme 1, a lysozyme recently purified from C. virginica plasma. Differences between cv-lysozyme 2 and cv-lysozyme 1 molecular characteristics, enzymatic properties, antibacterial activities, distribution in the oyster body and site of gene expression indicate that the main role of cv-lysozyme 2 is in digestion. While showing that a bivalve mollusk employs different lysozymes for different functions, findings in this study suggest adaptive evolution of i type lysozymes for nutrition. Received 30 August 2006; received after revision 14 October 2006; accepted 6 November 2006     

浅议如何为孩子的语言加点色彩

文章从词汇积累的3个层次贯通课内外的阅读,探索了语言积累的方法和途径。     

Fluid particle accelerations in fully developed turbulence

The motion of fluid particles as they are pushed along erratic trajectories by fluctuating pressure gradients is fundamental to transport and mixing in turbulence. It is essential in cloud formation and atmospheric transport, processes in stirred chemical reactors and combustion systems, and in the industrial production of nanoparticles. The concept of particle trajectories has been used successfully to describe mixing and transport in turbulence, but issues of fundamental importance remain unresolved. One such issue is the Heisenberg-Yaglom prediction of fluid particle accelerations, based on the 1941 scaling theory of Kolmogorov. Here we report acceleration measurements using a detector adapted from high-energy physics to track particles in a laboratory water flow at Reynolds numbers up to 63,000. We find that, within experimental errors, Kolmogorov scaling of the acceleration variance is attained at high Reynolds numbers. Our data indicate that the acceleration is an extremely intermittent variable--particles are observed with accelerations of up to 1,500 times the acceleration of gravity (equivalent to 40 times the root mean square acceleration). We find that the acceleration data reflect the anisotropy of the large-scale flow at all Reynolds numbers studied.     

Translucent glass globules on the Moon

Glass is ubiquitous in lunar regolith,and volcanism and hyper-velocity impacts are the major mechanisms of forming lunar glasses.Volcanic glasses on the Moon oc...     

输电线路节理化岩体注浆锚杆基础抗拔力数值模拟研究

采用正交数值模拟方法研究了岩体及注浆体相关因素对节理化岩体注浆锚杆基础抗拔力的影响.数值模型中考虑了岩石弹性模量、浆体弹性模量、节理迹长、节理倾角、锚杆埋深5个因素的变化,选择5因素4水平的正交试验方法进行了数值模拟.结果表明,锚杆埋深对注浆锚杆基础抗拔力的影响最大,其次为浆体弹性模量、岩石弹性模量、节理迹长、节理倾角,浆体弹性模量和强度对锚杆基础抗拔力的影响虽然大于岩石弹性模量的影响,但是提高浆体强度和弹性模量对节理化岩体注浆锚杆基础抗拔力的提升效果有限.     

基于异构蜂窝业务量预测的基站休眠策略

为了提高第5代(the fifth generation,5G)移动通信中异构蜂窝网络基站的频谱效率,提升用户的服务质量.提出了一种基于小波神经网络的基站休眠策略(neural network based stations sleep strategy in macro-femto heterogene-ous networks,NNSS),在神经网络预测模型中,把隐含层的传递函数用小波函数替换,并采用梯度下降算法,建立一个小波神经网络的预测模型.预测出家庭基站在一个周期内的业务量,根据预测值制定合理的基站休眠策略;同时考虑用户与基站间的中断概率,设计用户重关联算法,实现家庭基站对用户服务质量的优化.实验结果表明,基于小波神经网络的基站休眠策略在提高系统频谱效率的同时,降低了用户的中断概率.