光纤PCVD法激光熔融过程分析

利用热传导理论，结合ＬＰＨＶＤ（激光等离子体混合气相沉积）工艺，从激光功率密度、光斑尺寸、预制棒平动速度和转动速度等方面分析光纤ＰＣＶＤ法中激光熔融过程，并优化这些参数，得到功率密度、运动速度、熔融时间、熔融厚度等之间的具体关系。     

变频调速技术在滴灌中的应用

以实地试验资料为依据，分析了变频调速技术对大棚滴灌均匀度的影响及其应用于大棚滴灌的节能效果。结果表明，在同时工作的大棚数相同的情况下，水泵变频运行时的最大滴灌均匀度与水泵工频运行时的最大滴灌均匀度最大相差不超过2％，而水泵耗电量却前者只有后者的27％；同时工作的大棚数不同，变频压力需作相应的调整，以便能达到较高的滴灌均匀度；变频调速技术在大棚滴灌中具有较为明显的节能效果，其节能为65．7％～78．6％．     

城市规划与城市功能互动发展——以深圳市为例

深圳市由一个边陲小镇发展成为现代化的特大城市 ,城市规划从无到有 ,逐步完善 ,为城市功能的发挥起了良好的推动、调控、指导与服务作用 .通过对深圳市 2 0年城市规划与城市功能互动发展的透视 ,凝练出深圳城市规划在引导城市发展中的实证性经验 ,旨在为国内其它城市的规划与发展提供借鉴 .     

架桥机主梁结构瞬态动力学分析

以JQl20架桥机为研究对象，针对架设边梁时的偏心动载荷所引起架桥机结构的弯扭耦合振动问题，基于瞬态动力分析理论，建立了架桥机主梁结构瞬态振动模型，用模态叠加法对其进行了结构动力响应分析，得到了该架桥机结构设计中应采用的动载系数（κ=1．2）。该结论也可作为其他架桥机设计时的参考。     

非线性Volterra积分方程的最小和最大解

本文用迭代方法研究了Volterra积分方程在锥段中的最小和最大解,并证明了参考文献中主要结果的条件可被较弱条件代替。     

Peptidergic transmitters in synaptic boutons of sympathetic ganglia

In sympathetic ganglia of the bullfrog, a slow synaptic potential lasting for minutes--the late slow excitatory postsynaptic potential (e.p.s.p.)--was discovered. This slow response, unlike other previously known synaptic potentials in the autonomic nervous system, is not mediated by acetylcholine or monoamines. Similar non-cholinergic, non-adrenergic slow synaptic potentials have since been found in several other vertebrate autonomic ganglia. We found that the late slow e.p.s.p. is probably mediated by a peptide that is identical to, or closely resembles, mammalian luteinizing hormone releasing hormone (LHRH), because (1) when applied directly to sympathetic neurones, LHRH and its agonists elicit a slow depolarization, associated with similar changes in membrane conductance and excitability as those occurring during the late slow e.p.s.p. Furthermore, both peptide-induced and nerve-evoked responses are blocked by antagonists of LHRH; and (2) radioimmunoassays indicate that a chain of sympathetic ganglia contains 100-800 pg of a LHRH-like peptide. Its distribution among spinal nerves, the great reduction of this substance following denervation, and its release from ganglia following isotonic KCl treatment or nerve stimulation suggest that the LHRH-like material is contained in preganglionic nerve fibres. Here we report that immunohistochemical staining of sympathetic ganglia shows that LHRH-like immunoreactivity is indeed present in synaptic boutons. We also show that the two types of ganglion cells (B cells and C cells) receive strikingly different patterns of peptidergic innervation.     

应变硬化材料圆孔边局部应力场的光弹塑性分析

局部应力分析对工程设计具有广泛的重要作用,然而应变硬化材料因其本构关系的复杂性,至使大量的弹塑性局部应力问题难于采用理论分析方法求解。本文作者克服了实验技术上的困难,采用应变硬化材料聚碳酸酯对中心圆孔受拉板的孔边局部应力进行了光弹塑性实验研究,得到其弹塑性应力场、应变场及塑性区尺寸的规律,为弹塑性局部应力的实验研究提供了一条有效途径。     

唐家河自然保护区的鸟类区系研究

唐家河自然保护区有鸟类 15 8种 .繁殖鸟类 137种 ,其中古北界种类 5 6种 ,东洋界种类 6 3种 .保护区内有我国特产鸟类 2 0种 ,属于国家保护鸟类 2 2种 .该研究论述了保护区各垂直带繁殖鸟类的区系组成、优势种、常见种以及资源鸟类的类型 .     

Human cerebellar activity reflecting an acquired internal model of a new tool

Theories of motor control postulate that the brain uses internal models of the body to control movements accurately. Internal models are neural representations of how, for instance, the arm would respond to a neural command, given its current position and velocity. Previous studies have shown that the cerebellar cortex can acquire internal models through motor learning. Because the human cerebellum is involved in higher cognitive function as well as in motor control, we propose a coherent computational theory in which the phylogenetically newer part of the cerebellum similarly acquires internal models of objects in the external world. While human subjects learned to use a new tool (a computer mouse with a novel rotational transformation), cerebellar activity was measured by functional magnetic resonance imaging. As predicted by our theory, two types of activity were observed. One was spread over wide areas of the cerebellum and was precisely proportional to the error signal that guides the acquisition of internal models during learning. The other was confined to the area near the posterior superior fissure and remained even after learning, when the error levels had been equalized, thus probably reflecting an acquired internal model of the new tool.     

织物设计中的色彩搭配

本文以色彩构成理论为依据，找出小配色模纹和较大配色模纹的不同配色所产生外观效应的规律，应用色彩构成规律使织物组织的设计尽可能符合美学观点。