ADSL帧同步的实现

分析了ＡＤＳＬ系统中帧与超帧的结构与性质，由此提出了时域和频域两种帧同步实现方法，介绍了一种简化的搜索帧边界的方案，以及具体的硬件实现，可实现帧边界的快速定位。     

蒙脱石及其复合物作为药物载体的研究进展

在医药领域,蒙脱石具有多种优良药用辅料性能,开发潜力巨大。对蒙脱石作为药物载体的研究呈逐年增加的趋势,主要是对蒙脱石作为抗肿瘤药的缓、控释制剂载体的研究,近年来亦有对其作为矫味和降低毒副作用载体的研究。分两大类概括总结了蒙脱石作为药物载体的国内外最新研究进展,为今后科研工作者做蒙脱石给药系统的深入研究提供了科学依据。     

光学导引系统的建模与仿真

在整个定点着舰过程中，飞机着舰下滑阶段的操纵难度和危险系数都是最高的，如何解决光学导引仿真中模型的准确度和视景特效的逼真度。是定点着舰仿真应用的重中之重。为了解决上述问题，根据光学导引秉统成像原理以及飞机、舰之间的几何关系，实时计算光学下滑道，建立了仿真平台的数学模型，并给出了状态方程。在基于VP平台的视景系统中，采用“立体光面”和动态缩放光晕的方法建立菲涅尔助降灯阵和迎角指示器的模型，保证了模拟着舰过程中飞行员视觉的逼真度。以美F-16飞机模型，进行了多次计算机仿真着舰，试验数据表明：在理想条件下光学导引仿真平台模型正确可信，飞行员着舰质量明显提高，能够起到导引着舰的作用。     

基于高频信号注入的永磁电机转子位置估计方法中的电压输入

运用高频信号注入法估计永磁同步电机转子位置要求给电机同时施加基本电压和高频电压. 本文讨论了通过采用PWM调节的逆变器同时注入这两种电压的可行性,并进行了仿真研究. 结果表明,只要选择合适的调制信号和载波比就能够实现电压的叠加输入. 同时,对逆变器的非线性行为所带来的影响也作了深入的探讨,证明其仅在电流流过零处对输出结果产生影响. 根据这一特点,提出了相对比较简单的补偿措施,仿真结果证明了这一措施的正确性.     

Research on Radiant Carrier of Matching Radiant Type Far Infrared Textiles

This paper deals with the radiation effects of different kinds ofradiant carriers used in making far infrared textile materials.From two radiation experiments,methods of testing radiation ef-fects of carriers have been found,results of the experiments arediscussed.Finally,some conclusions for choosing appropriateradiant carrier are drawn.     

苯甲醇在阳离子染料染阴离子改性涤纶中的作用机理

对文题的研究表明,染料阳离子与纤维内部的阴离子经离子交换而结合。染色是放热及熵减小过程。苯甲醇的存在,提高了染色饱和值和染色速度;降低了染色亲合力、染色热及染色熵;消除了环染,其效果随染浴(或纤维)内苯甲醇浓度的升高而加强。用红外光谱法及X-射线衍射法测定了经苯甲醇水溶液处理过的聚合物的结晶性能;用差式扫描量热法、拉伸试验和动态粘弹谱等方法测定了该聚合物的熔融及力学性能。结果表明,苯甲醇渗入了聚合物(纤维)内部,并减弱其非晶区的分子间的相互作用,但不破坏结晶区,同时导致纤维溶胀,链段淌动性加强,因而促进了染色。     

利用电力线传输电话的载波电话机

本文介绍一种实用的载波电话机的原理电路及其基本工作原理,这种载波电话机直接利用电力线作为传输线,可以在一定的区域内传输电话信号,并不受通用电话系统的限制。因此,具有使用方便灵活,价格低廉、安全可靠等特点,有较好的实用性。     

计算有斜柱刚架各边相对线位移的新型方法

利用作平面运动刚体两点线位移在其连线投影相等及相对、牵连、绝对线位移间的矢量关系可迅速求解有斜柱刚架各边相对线位移。     

Functions of fatty acid binding proteins

Summary Cytosolic fatty acid binding proteins (FABP) belong to a gene family of which eight members have been conclusively identified. These 14–15 kDa proteins are abundantly expressed in a highly tissue-specific manner. Although the functions of the cytosolic FABP are not clearly established, they appear to enhance the transfer of long-chain fatty acids between artificial and native lipid membranes, and also to have a stimulatory effect on a number of enzymes of fatty acid metabolism in vitro. These findings, as well as the tissue expression, ligand binding properties, ontogeny and regulation of these proteins provide a considerable body of indirect evidence supporting a broad role for the FABP in the intracellular transport and metabolism of long-chain fatty acids. The available data also support the existence of structure- and tissue-specific specialization of function among different members of the FABP gene family. Moreover, FABP may also have a possible role in the modulation of cell growth and proliferation, possibly by virtue of their affinity for ligands such as prostaglandins, leukotrienes and fatty acids, which are known to influence cell growth activity. FABP structurally unrelated to the cytosolic gene family have also been identified in the plasma membranes of several tissues (FABP_pm). These proteins have not been fully characterized to date, but strong evidence suggests that they function in the transport of long-chain fatty acids across the plasma membrane.