头痛18例病因探讨

本文通过对18例头痛病例的分析,找出其病因,进行初步探讨,说明头痛的病因是多方面的,有时可成为某些严重疾病的一个危险信号.     

略论高校现代汉语教学

传统的现代汉语教学体系严重的滞后于当前社会发展的形势，必须建立动态的科学的新体系，吸纳科研新成果，突出创新意识和素质培养，注重理论与实践相结合，是现代汉语教学适应21世纪新形势、新需求的途径之一。     

BP神经网络人脸检测研究

使用了反向传播神经网络和支撑向量机两种技术分别完成了人脸检测算法,对比了两种方法在人脸检测上的优劣.实验证明,在本文描述的环境下,支撑向量机技术能够更有效地处理多人脸、复杂背景的定位,算法高效、稳定,具有较强鲁棒性.     

Influence of atmospheric ice nucleus concentrations on cold cloud radiant properties and cold cloud reflectivity changes in past years

CLOUD CAN INFLUENCE GLOBAL RADIATIVE BALANCE TO A LARGE EXTENT.ITS RADIATIVE FORCING CAN BE VERY IMPORTANT TO GLOBAL CLIMATE CHANGE[1,2].CLOUD HAS BOTH UMBRELLA EFFECT AND WARM HOUSE EFFECT.NET RADIATIVE FORCING OF CLOUD IS THE COMBINATION OF THE TWO EFFE…     

人工神经网络在土石坝安全监测系统中的应用

介绍了土石坝安全监测系统研究的目的、内容以及人工神经网络BP模型的建立,论述了人工神经网络在土石坝监测资料分析中的应用,可以给大坝管理带来新的技术,有助于充分发挥工程效益,有效地改善工作人员的劳动条件和减轻劳动强度。     

碱性条件下芳环上碳代异戊烯基的方法研究

该文首次论述了在不同的碱性条件下芳环上碳代异戊烯基的方法，参考文献24篇。     

Receptor binding, internalization, and retrograde transport of neurotrophic factors

This review deals with the receptor interactions of neurotrophic factors, focusing on the neurotrophins of the nerve growth factor (NGF) family, the glial cell derived neurotrophic factor (GDNF) family, and the ciliary neurotrophic factor (CNTF) family. The finding that two proteins, p75^NTR and Trk, act as receptors for NGF in neurons generated the discovery of other neurotrophic factors/receptor families and has enhanced our understanding of the development, survival, regeneration, and degeneration of the nervous system. The kinetics of binding, the structure of the ligand-receptor complex, and the mechanism of retrograde transport of the neurotrophins are discussed in detail and compared to information available on the GDNF and CNTF families. Each neurotrophic factor family, i.e., NGF, GDNF, and CNTF, has a set of receptors with specificity for individual members of the family and a common receptor without member specificity that, in some families, generates the cellular signal and retrograde transport.     

周围神经损伤后的免疫反应及神经再生实验研究

为实验观察周围神经损伤后局部免疫与神经再生的关系,采用Wistar大白鼠60只,随机分成四组,测定坐骨神经损伤后的免疫反应以及神经再生和功能恢复。结果表明,在神经损伤局部发生免疫反应,而免疫强度与神经损伤程度相关,神经再生和功能恢复亦与免疫反应强度有关,证明神经损伤后的免疫反应对神经再生的恢复有一定抑制作用。