高分辨率成像二元光学系统的研制与实验结果

已研制成功一个折衍射混合式成像二元光学系统,焦距800mm,有效通光口径76mm,成像光谱范围从435.8nm到656.3nm.成像质量实测结果为20lp/mm时MTF值达到0.75,比同样条件下一个传统的折射式系统MTF所能达到的设计值高百分之三十以上。     

A modification of the chromic tartrate silver impregnation technique for block impregnation of the central nervous system and paraffin wax embedding

This paper describes a block silver impregnation technique for the CNS. The procedure, which is quite simple, yields highly consistent and reproducible results. After fixation during 6–10 days in 10% saline formaldehyde, 4 mm thick blocks of brain are treated with chromic anhydride and sodium potassium tartrate solution for 4 days. After this period the specimens are rinsed in 0.75% silver nitrate solution to which 8–10 drops of pyridine per 100 ml of solution have been added. This is followed by impregnation for 4 days at 37°C in silver nitrate-pyridine solution identical to that used in the previous rinsing step. The impregnated blocks are reduced during 20–26 h in 1% pyrogallol to which 6 ml commercial formaldehyde per 100 ml of solution have been added, followed by dehydration in dioxan and paraffin embedding. Sections no thicker than 30 μm are then cut for histological study. This fundamentally neurofibrillar method reveals: (a) neuronal somata and their processes; (b) synaptic structures; (c) fibre bundles; and (d) cell nuclei and nucleoli.     

基于S5PC100嵌入式平台的仓库监控系统设计

根据国内仓库监控的现状,设计并实现了一款基于嵌入式Linux的仓库监控系统。其前端以嵌入式S5PC100为控制核心,在对硬件和软件进行了总体设计之后,重点研究并实现了TCP/IP协议网络下的嵌入式前端TCP方式的温湿度及控制信号传输和UDP方式的视频传输,实现了基于Video4Linux（V4L）技术对视频图像信息的采集。经测试,系统稳定可靠、成本低、可扩展性强,在其他监控领域也有一定的参考价值。     

Age-dependent changes in the nervous and endocrine control of the thymus

The immune system, especially the thymus, undergoes age-related modifications leading to structural and functional changes in the lymphoid organs and immunocompetent cells. Nevertheless, the consequences of thymic involution in the peripheral pool of T-cells are still a matter of controversy. The control of the thymic function is very complex and involves intrathymic signals, the autonomic nervous system, and the endocrine system. Both thymocytes and thymic stromal cells express receptors for a wide range of hormones, as well as for neurotransmitters and neuropeptides, thus affecting thymocytes maturation. This review summarizes the age-dependent variations in the extrathymic components of the thymic microenvironment, i.e., vegetative nerves and hormones, and the possible effects of those changes in the immune function.     

视网膜细胞显微镜的照明系统

为满足视网膜细胞成像照明光束的高亮度、窄谱宽要求,提出了一种用于视网膜细胞成像的照明系统,将半导体激光器发出的632.8nm激光耦合到芯径为105μm的多模光纤中,用聚光镜将多模光纤的出光端汇聚到一个旋转毛玻璃上,再用一个投射物镜将毛玻璃上的光源像投射到眼睛里照亮视网膜。试验发现该照明方法很好地消除了激光散斑,满足视网膜显微成像对高亮度光源的要求,光源有较窄的谱宽,成像系统色差很小,成像质量优于采用传统氙灯做照明光源的图像。该照明系统能较好地满足视网膜显微成像。     

用于光阻断效应的B270-As2S8复合光波导的设计

尽管可以采用光折变技术制备硫化砷条波导,但工艺参数控制复杂,且传输损耗较大.为了解决这一问题,提出了一种用于光阻断效应的新型B270—As2S8复合光波导结构.该设计根据光波导模式耦合的基本原理,借助波束传播法(BPM)仿真软件,主要通过对离子交换波导交换时间和As2S8薄膜厚度的匹配设计,实现了632.8nm波段导波模场分布集中在As2 S8薄膜中传输,并始终维持单模特性.这个特点为有效实现光阻断效应提供了条件,非常具有实用价值.     

Receptor binding occurrence and plasma levels of natriuretic peptides in response to sympathectomy

In the present investigation the relationship between the sympathetic nervous system and the endocardial levels of receptor binding sites for natriuretic peptides and the plasma content of atrial natriuretic peptide were analyzed in rats. In order to destruct the cardiac sympathetic nerve terminals, chemical sympathectomy with 6-hydroxydopamine was made in parallel with intravenous measurements of blood pressure and heart frequency. By use of immunohistochemical and enzyme-linked-immunosorbent techniques the expression of tyrosine hydroxylase-positive sympathetic nerve terminals and plasma levels of pro-atrial natriuretic peptide were determined, respectively. The occurrence of receptor binding sites for natriuretic peptides was examined by in vitro receptor autoradiography. In contrast to the marked occurrence of natriuretic peptide receptor binding sites seen in the ventricular endocardium of control rats, the sympathectomized rats exhibited a decreased number of binding sites for natriuretic peptides in the endocardium of both the right and left chambers. Interestingly, this was found in parallel with a significant decrease of systolic and diastolic blood pressure and increased plasma levels of pro-atrial natriuretic peptide in the treated group of rats. These findings, together with those in previous studies, give support to an idea that one part of the blood pressure-decreasing effects, seen in patients treated with beta-adrenergic blockade, might be through a reduction of the natriuretic clearance receptor C, then giving rise to increased levels of atrial natriuretic peptide.     

基于嵌入式的测温系统设计及其Proteus仿真

介绍了利用Pt100电阻式温度检测器测量环境温度的设计过程,作为系统的核心处理器,LPC2124实现了输出温度在液晶上显示和串口通信,使用Proteus对系统进行综合仿真,结果表明本设计具有精度高、运行稳定的特点。     

Induced maturation of frog mast cells by nerve growth factor during ontogenesis

The effect of nerve growth factor (NGF) on ontogenesis of frog mast cells was investigated in vivo by histochemical, morphometric, and ultrastructural analysis. Three groups of tadpoles at various stages of development were used. In the first group, the larvae received i.p. injections of 1 ng NGF/g; the second group received 10 ng NGF/g, while the control group received only the vehicle. The first recognizable mast cells arose symmetrically in the tongue at stage 26 of Witschi's standard table. At stages 26 and 29, the mast cell number in the NGF-injected tadpoles was significantly higher than the control group. From stage 29 onward, the mast cell number rapidly increased in all groups. No significant differences in mast cell number were observed between the control group and the NGF-injected groups at stages 31 and 33. Electron microscopy revealed that at metamorphic climax (stage 33), the mast cells in the NGF-treated groups were more mature than those in the control group. Therefore, nerve growth factor at early stages of tadpole development is likely to induce differentiation of mast cell precursors, while at later stages it is likely to induce maturation of immature mast cells. The close anatomical association between mast cells and perineurium, observed during nerve development, is intriguing. Already in the early stages of nerve development, the mast cells form a network around Schwann cell-axon complexes, together with the perineurial cells. At climax, the mast cells are located between the perineurial layers, suggesting that they may play a role in the tissue-nerve barrier of the perineurium. Nerve growth factor also seems to induce perineurial cell maturation.     

一种微透镜--针孔阵列合成器件的制作方法

微透镜阵列与针孔阵列的组合光学器件是全场共焦检测中的一个关键器件，微透镜中心与针孔中心要求严格对准，相应的装配对准精度应控制在几微米之内，本文给出了一种可进行5自由度高精度调节，并利用光学显微镜进行实时监测的对准方法。     

高低温试验箱控制系统的设计

为了使仪表能够进行高、低温试验,设计了一个以SAM7X256₁28为主芯片植入linux操作系统的温度控制系统。采用热电阻Pt100进行温度采集,控制方式采用位式控制和PWM控制,具有时钟可自动计时、系统自动报警和自动断电的保护措施。此装置还与PC机相连,方便用户观察和记录数据。     

浅谈视觉检测技术在折弯机上的应用

阐述了视觉检测技术的工作原理及其具有非接触、速度快、柔性好等特点,在把LAZERSAFE公司的IMG-100角度自动检测装置安装在折弯机床上的基础上,通过视觉检测系统获取折弯角度,以帮助工作人员校正折弯角度,并监控机床的运行,保证工作人员的安全。通过实验表明,该项应用对于产品品质的把控,起到至关重要的作用。     

基于网络技术的煤矿安全监察信息管理系统开发

阐述了矿山安全监察系统的设计与实现,系统采用C/S和B/S混合模式,在各监察分局内使用C/S模式,方便数据的传输,保证内部信息的高度安全及信息传输和处理的高效;在不同的监察分局之间对系统的访问和信息交互则采用B/S模式,这样可充分利用INTERNET以降低成本,实现远程的信息传输和查询分析。并根据用户需求生成不同的显示界面,从而实现数据的动态浏览显示。