M.B.积分、B.E.积分、F.D.积分及其应用

本文给出了麦免斯韦—玻耳兹曼积分(M.B.积分)、玻色—爱因斯坦积分(B.E.积分)和费密—狄拉克积分(F.D.积分)的计算公式,并应用这些积分公式对经典理想气体、理想玻色气体和理想费密气体的主要热力学量进行了计算。其特点是对经典系统和量子系统都给出了统一的表述形式。     

B-值随机级数的强可积性

在已有文献中研究了eλ‖v‖的强可积性,其中V=sum εnun,un from 1 to ∞是固定B-值向量,ε1,…,εn,…是Rademacher序列,在此基础上一类随机级数sum εnun from 1 to ∞的性质被研究并得出了类似的结果.     

Neurotrophic regulation of synapse development and plasticity

Neurotrophic factors are traditionally thought to be secretory proteins that regulate long-tern survival and differe, ntiation of neurons. Recent studies have revealed a previously unexpected role for these factors in synaptie de velopment ami plasticity in diverse neuronal populations. Here we review experimeuts carried oul in our own laboratory in the last few years.. We have made two important discoveries.First,we were among the first to report that brain-derived. neurotrophie faclor (BDNF) facilitates hippocampal hmg-term potentiation (LTP), a form of synaptic plaslicity believed to be involved in learning and memory. BDNF modulates LTP al CAI synapses by enhaneing synaptic responses to high frequency, tetanic slimulalion. This is achieved primafily by facilitating synaptie vesicle doeking, possibly due to an in crease in the levels of the vesicle prolein synaptobrevin and synaptoplysin in the nerve terminals. Gene knockout study demonstrates thai the effects of BDNF are primarily mediated through presynaptic mechanisms. Second, we demonstrated a form of long-term, neurotrophin-mediated synaptic regulation. We showed that long-term treatment of the neuromuscu lar synapses with neurotrophin-3 (NT3) resulted in an enhancement of both spontaneous and evoked synaptic currcuts, as well as profound changes in thc number of synaptic varicosities and syuaptic vesicle proteins in motoneurons, all of which are indicative of more mature synapses. Our current work addresses the following issues:(i) activity-dependent trafficking of neurotrophin receptors, and its role in synapse-specific modulation; (ii) signal transduction mechanisms medialing the acute enhancement of synaplic transmission by neurotrophins; (iii) acute and long-tenn synaptie actions of the GDNF family; (iv) role of BDNF in late-phase LTP and in the development of hippocampal circuit.     

MODSOFT软件在承钢高炉的突破

本文针对MODSOFT软件在生产使用过程中存在的问题,进行了分析,并提出了相对应的解决方案。     

带有Neumann边界的p-Laplacian方程组正解的存在性

在本文中,我们讨论带有齐次Neumann边界条件的拟线性方程组的边值问题,在合适的参数条件下得到了正解的存在性.本文所依赖的方法是特征值理论和P.S.条件.     

随机广义概周期序列

运用随机多项式的界估计,研究了一般随机广义概周期序列,得到了一般随机序列是H．a．p序列和R．a．p序列且谱是空集的一个充分条件．     

二次供水系统用水模型与管网状态预测

现有的二次加压供水中存在很大的能量浪费,主要表现在其供水方式的不合理和缺乏 较好的控制方法.本文介绍了可利用市政管网压强能量的二次供水系统的用水模型.并针对城市供水系统的复杂性、非线性、时变性和多因素影响的特点,引入人工神经网络,用于管网状态负荷预测.     

纸机分布传动计算机监控系统

介绍用89C52单片机和工业控制计算机组成的纸机分布传动计算机监控系统.主要包括系统的硬件结构和软件设计.     

Molecular evolution of scorpion a-toxins----Accelerated substitutions and functional divergence

Scorpion a-toxins are a family of toxic proteins with similar scaffold, but possess divergent pharmacological properties. Analysis of cDNA sequences reveals that the numbers of nucleotide substitutions per site ( K ) for 5' and 3' UTRs are smaller than those per synonymous site ( Ks) for the mature peptide-coding sequences, whereas the numbers of nucleotide substitutions per nonsynonymous site (-Ka) are close to or larger than Ks values for relevant pairs of cDNAs. These results, together with phylogenetic analysis, indicate that scorpion a-toxins have evolved by accelerated substitutions in the mature toxin regions. In addition, the 15 amino acids, absolutely conserved in all the scorpion a-toxins described so far. are mostly located in molecular interior, which may be involved in structural constraints for stabilizing the CSa(3 fold in evolution of these molecules. Four hot spot mutation sites in the molecular surface are found to distribute in the putative functional regions of a-toxins. suggesting that positive Darwinian selection drives the accelerated evolution of scorpion a-toxins. These findings reasonably explain the relationship between three-dimensional structure conservation and functional divergence of scorpion a-toxins and are of important value in guiding us in our engineering experiments to obtain higher affinity ligands to Na+ channels.     

D.S.规划的uv-分解

主要利用uv-分解理论分析D.S.规划。先将D.S.函数uv-分解,再给出D.S.规划算法和最优性条件。     

A model of backdraft phenomenon in building fires

In order to further investigate the physical mechanism of the backdraft phenomenon in building fires, a simplified mathematical model is established based on energy balance equation, and its catastrophe mechanism is analyzed based on catastrophe theory, and the relationship between system control variables and fire conditions is studied. It is indicated that the backdraft phenomenon is a kind of typical catastrophe behavior, and of the common characteristics of catastrophe.     

B.R.S.变换的推广

本文从要求拉氏函数密度的不变性出发导出了非阿贝尔规范场中的Ｂ．Ｒ．Ｓ，变换，论证了其中的系数ξ与内部空间分量指标ａ．ｂ．ｃ……的无关性；并推广了Ｂ．Ｒ．Ｓ．变换及Ｗａｒｄ－Ｔａｋａｈａｓｈｉ恒等式．在普遍情况下，规范群的群参量θ（ｘ）没有不定性．     

浅析中学动漫的E.A.S.Y.教学模式

动漫在整个社会生活及文化产业中的地位不断提升,中学的动漫教育目前还缺乏针对性的教育。为对传统的动漫教学模式进行创新,探索动漫教学的E.A.S.Y.教学模式,来加快动漫课程的实践化、科学化、全面化。     

随机级数的a.s.S-可和性与a.s.收敛性

通常在随机向量对称性条件下,人们研究随机级数a.s.S-可和性与a.s.收敛性的关系及a.s.S-有界性与a.s.有界性间的联系.对有关a.s.S-可和及a.s.有界的重要引理和定理进行了改进和推广,得到了进一步的结果.     

一类非线性K.D.V.-Burgers方程的有限差分法

研究非线性K.D.V.-Burgers方程的初值问题，应用非线性函数的有界延拓法，证明了差分解的收敛性与稳定性。最后给出了数值例子。     

一种基于非线性规划的数据校正联合算法

在工业生产的测量控制过程中,数据校正技术作为一种有效的改善测量数据质量的技术,逐渐被重视和研究.本文借鉴了其它数据校正方法的理论思想,在结合序贯二次规划(SQP)方法求解最优化问题的基础上,将数据调和与显著误差检测有机的糅合,提出一种循环迭代处理的联合算法,使数据调和在快速与有效的基础上具有较高的显著误差检测功效.     

秦皇岛-沈阳天然气管道工程光纤选型的研究

本文以秦皇岛-沈阳天然气管道工程SDH光通信系统为例,详细介绍了光纤的各种分类,包括单模光纤G.652、色散位移光纤G.653和非零色散位移光纤G.655及其子类,并对每类光纤所适合的光传输系统速率和其色散特性进行了详尽的分析,为光纤的选型提供科学的依据。     

迭代学习控制的研究与进展

本文先回顾迭代学习控制的历史,讨论了迭代学习控制的各种控制算法,指出迭代学习控制现在存在的问题和未来发展的趋势.     

幺半群环的弱p.p.性质

设R是环,G是幺半群.证明:(1)如果R是abelian环,G是u.p.-幺半群,则幺半群环R[G]是弱p.p.-环当且仅当R是弱p.p.-环;(2)如果G是非周期的幺半群,R是G-Armendariz环,则幺半群环R[G]是弱p.p.-环当且仅当R是弱p.p.-环.     

基于DDMF和ADMF的TMD动力特性

为试图利用适用于单自由度结构的TMD最优参数来设计用于多自由度结构振动控制的TMD，研究了TMD动力特性对结构振型参与系数的敏感性.考虑结构的振型参与系数，导出了设置TMD结构的位移和加速度动力放大系数(DDMF和ADMF)的解析表达式.于是TMD的优化准则定义为：结构的位移和加速度最大动力放大系数的最小值的最小化(Min.Min.Max.DDMF和Min.Min.Max.ADMF).根据选择的优化准则，得到了不同结构振型参与系数的TMD最优参数和控制效果，并给予评价.现在，设计者可以容易地设计用于多自由度结构振动控制的TMD.