抑制素及相关肽

换制素一直被认为是一种性腺激素,它对垂体促性腺细胞FSH的分泌具有一定的负馈调节作用。本文综述了近年来抑制素及其相关肽的最新研究。从抑制素的检测方法到结构描述,从抑制素的产生调节到可能的生物作用,本文都做了详尽的叙述。     

旋风分离器的颗粒浓度分布的实验研究

用等速抽气采样法测定了旋风分离器内颗粒浓度分布.测定结果表明.由中心到器壁.颗粒浓度逐渐升高.不存在以往分离模型中常用的横向完全返混.沿轴向由排尘口到排气管下口.颗粒浓度逐渐降低.但有一个最低点.它靠近排气管下口.这说明一定的分离空间高度有利于返混颗粒的二次再分离.实验表明.顶灰环、短路流及排尘口返混是影响分离效率的不利因素.改变分离器入口面积及排气管下口直径对分离空间内颗粒浓度分布的影响规律是不同的.利用颗粒浓度分布曲线计算分离效率,其计算值与用称重法所得实测值吻合较好.     

2ZKX2148型直线振动筛侧板的有限元动力学分析

以结构力学理论为依据,以有限元ＳＡＰ５程序为计算手段,提出了一种直线振动筛侧板的动力学强度的计算方法,并分析了这类振动筛在侧板上产生裂纹的原因．     

一类中立型时滞偏差分方程的振动性

讨论一类中立型时滞偏差分方程T（V1，V2）（Bm,n-cBm-τ,n-σ）＋Pm,nBm-k,n-t=0的振动性。得到了该方程所有解振动的充分条件，获得了新的结果．     

Analysis of wire antennas mounted on large perfectly conducting platforms using MLFMA

The electric field integral equation (EFIE) combined with the multilevel fast multipole algorithm (MLFMA) is applied to analyze the radiation and impedance properties of wire antennas mounted on complex conducting platforms to realize fast, accurate solutions. Wire, surface and junction basis functions are used to model the current distribution on the object. Application of MLFMA reduces memory requirement and computing time compared to conventional methods, such as method of moment (MOM), especially for the antenna on a large-sized platform. Generalized minimal residual (GMRES) solver with incomplete LU factorization preconditioner using a dual dropping strategy (ILUT) is applied to reduce the iterative number. Several typical numerical examples are presented to validate this algorithm and show the accuracy and computational efficiency.     

基于共生理论的物流金融价值增值作用分析

借用共生理论中共生介质的概念,说明物流金融在制造企业和物流企业共生关系中的介质作用,即其对两者共生关系中物质流、资金流、信息流的整合效果,说明价值增值是共生系统能量增长的一种表现形式.结合波特的价值链模型,分别论证了物流金融对制造企业和物流企业及它们所形成的共生系统的价值增值作用,阐明了价值增值主要源于风险成本的降低及新服务业务的利润增加.研究表明物流金融之于制造企业和物流企业走向对称互惠共生模式的必不可少的介质.     

反应气氛对铝热还原氧化钛合成氮化钛的影响

研究在流动氮气和埋炭条件下铝热还原氮化TiO2的反应过程,借助于X射线衍射(XRD)和扫描电子显微镜(SEM)分别测试和观察两种气氛中不同温度下处理后产物的物相组成和显微结构。结果显示,与流动氮气氛下一样,在埋炭气氛下采用铝热还原氮化法可以制备氮化钛复相材料,但处理气氛明显影响着铝热反应的程度及产物的形貌,在埋炭条件下处理后的产物中氮化钛含量、晶粒大小、晶格常数明显低于流动氮气氛下处理产物中上述各项值;热力学计算发现埋炭条件下铝除参与铝热还原反应外,还与炭粉床中氧发生反应,使参与铝热反应的金属铝不足,造成产物中有剩余的金红石存在。     

Neural correlation of item recognition and voice source retrieval

An experiment was conducted using event-related potentials to investigate the old/new effects of the item recognition and the voice source retrieval tasks on drawing. The results indicated that (1) the old/new effect for the voice source retrieval task was much wider than that of the item recognition task; (2) the distributive characteristics of the voice source memory effect were different from those in previous studies; (3) the old/new effects for target and non-target-old drawings were similar. These results demonstrated that the voice source retrieval task is more difficult than the item recognition task for drawing, which supports the dual-process model. The experimental material and the source characteristic regulate the spatial and temporal distributions of the old/new effect for the voice source retrieval task together.     

混合盐水密度模型的建立及应用

在回归得出单盐盐水密度模型的基础上，给出了混合盐水的密度模型。利用盐水密度模型，对混合盐水的最优配制和密度调整计算进行了探讨，给出了含两种盐的水溶液的配制和密度调整的计算公式。