Cartan双模代数间的σ—弱连续等距代数同构

本文证明了自伴部分是正常ｖＮ子代数的Ｃａｒｔａｎ双模代数间的σ－弱连续等距代数同构可以扩张成其生成ｖＮ代数间＊－同构．     

沥青路面结构设计是预防早期病害的关键

沥青砼路面具有良好的力学性能,在高速公路中广泛得到应用,但是早期出现病害也较为严重,文章结合实际主要从路面设计方面进行分析论述。     

Distributed synaptic modification in neural networks induced by patterned stimulation.

Activity-dependent changes in synaptic efficacy or connectivity are critical for the development, signal processing and learning and memory functions of the nervous system. Repetitive correlated spiking of pre- and postsynaptic neurons can induce a persistent increase or decrease in synaptic strength, depending on the timing of the pre- and postsynaptic excitation. Previous studies on such synaptic modifications have focused on synapses made by the stimulated neuron. Here we examine, in networks of cultured hippocampal neurons, whether and how localized stimulation can modify synapses that are remote from the stimulated neuron. We found that repetitive paired-pulse stimulation of a single neuron for brief periods induces persistent strengthening or weakening of specific polysynaptic pathways in a manner that depends on the interpulse interval. These changes can be accounted for by correlated pre- and postsynaptic excitation at distant synaptic sites, resulting from different transmission delays along separate pathways. Thus, through such a 'delay-line' mechanism, temporal information coded in the timing of individual spikes can be converted into and stored as spatially distributed patterns of persistent synaptic modifications in a neural network.     

高效液相色谱法测定乳粉中牛磺酸

用高效液相色谱法测定牛磺酸。在本色谱条件下，最低检出浓度０．０３ｇ／ｍｌ， 最低检出量为３ｘ１０－１０ｇ，符合测定乳粉中牛磺酸的需要。     

高校学报网络化是大势所趋

针对我国高校学报网络化程度低的现状，论述了高校学报网络化的重要意义及网络化对高校学报的积极影响，认为高校学报网络化是大势所趋。     

The Forecast and Regional Analysis of the Private Motor Vehicle Market in China

1　IntroductionThenumberofthemotorvehiclesownedbyindividuals(alsocalledprivatemotorvehicles)hasbeenincreasingsincethepolicywasmadetoallowsuchownershipinChinaintheearly1980s.ForaperiodfromthefoundationoftheP.R.Chinatotheearly1980s,onlystate-ownedorcol...     

PVC／PBA和PS／PBA两种LIPN的性能与相容性

通过对ＰＶＣ／ＰＢＡ（聚氯乙烯／聚丙烯酸丁酯）和ＰＳ／ＰＢＡ（聚苯乙烯／聚丙烯酸丁酯）两种ＬＩＰＮ的玻璃化转变温度Ｔｇ和动态力学等性能的测定，比较了它们的相容性和阻尼性能。实验结果表明ＰＶＣ／ＰＢＡＬＩＰＮ的相容性和阻尼性能较ＰＳ／ＰＢＡＬＩＰＮ更好     

扼流变压器容量的合理配置

在电气化铁道中，扼流变压器是强电与弱电的结合部分，合理而又科学地选择沿线扼流变压器的容量，对信号系统在强电干扰电磁环境下可靠工作，具有重大的实际意义。本论文在电气化铁道牵引回流分布、扼流变压器仿真及信号系统本身防干扰研究的基础上，提出了一套实现电气化铁道沿线扼流变压器合理配置的方法。     

三参数法在线实时测量铝酸钠溶液的化学成分

提出了在线实时测量铝酸钠溶液化学成分（如苛性钠、氧化铝）的温度－体积质量－电导率法．通过正交回归设计方法建立铝酸钠溶液的体积质量、电导率和其化学成分以及温度之间关系的数学模型，该模型为一非线性二元二次方程组．现场应用时，只要测出铝酸钠溶液的温度、体积质量和电导率，代入上述方程，即可由计算机计算出铝酸钠溶液的化学成分．本文介绍了方法的原理、数学模型的建立过程及现场实验结果     

人参皂甙－Rb_l对脂质体DPPC的作用机理

通过对人参皂甙－Ｒｂ１与脂质体ＤＰＰＣ作用的核磁共振谱和拉曼光谱的研究，表明人参皂甙－Ｒｂ１是作用于ＤＰＰＣ磷脂分子的极性头部．