基于89C55和82C54的光子计数仪的设计

介绍了82C54的基本功能和内部结构,控制寄存器的格式,模式0:计数结束发出中断信号的具体应用.本文给出了89C55单片机控制的硬件、软件设计实例.     

当归挥发油对人肺腺癌GLC-82细胞增殖及凋亡的影响

目的: 探讨当归挥发油对人肺腺癌GLC-82细胞增殖及凋亡的作用。方法: MTT比色法检测当归挥发油对GLC-82细胞的细胞毒作用;流式细胞术检测GLC-82细胞凋亡;吖啶橙/溴化乙锭（AO/BE）双荧光染色法观察GLC 82细胞凋亡。结果: 当归挥发油在浓度6.25～200 μg/mL范围内对GLC-82细胞的增殖具有浓度依赖性抑制作用,对GLC-82细胞的IC50为113.03 μg/mL。流式细胞术检测结果表明,当归挥发油可诱导GLC-82细胞凋亡、坏死,且细胞凋亡、坏死率随药物浓度增高而升高。AO/BE双荧光染色法结果显示,用药组随着药物浓度的升高,细胞结构固缩加重,凋亡、坏死细胞增多。结论: 当归挥发油具有诱导GLC-82细胞凋亡的作用。     

惯性仪表数据采集的一种实现方法

惯性仪表(陀螺仪和加速度计)是惯性导航系统中的核心部件。为便于导航计算机的数字处理．惯性仪表输出的信号通常要经过A／D或V／F转换。本文介绍惯性仪表输出信号经V／F转换后的信号处理方法，即陀螺仪和加速度计的输出经过V／F转换变成频率信号以后利用82C54构成的电路将其转化成具有一定脉冲当量的脉冲信号供计算机处理，按这种方法处理，计算机对惯性仪表的数据采集就转化为对脉冲信号的计数。文中从硬、软件两个方面讨论了这一设计与实现的方法。     

旋转变压器信号接口电路的设计与实现

在工作环境比较恶劣的情况下,选取的速度传感器需要具备较强的抗冲击/震动能力和抗温度/湿度变化能力,此时一般的角度测量装置已无法满足要求,而采用旋转变压器的方案可以取得良好的控制效果。介绍了旋转变压器一种角度测量系统中所用的几种芯片并介绍了该接口电路的软硬件设计。     

缩短SWRH82B硬线时效期工艺研究

分析影响SWRH 82B硬线时效性能的各种因素,通过有针对性的工艺试验,找出相应的技术应对措施,从而缩短SWRH 82B硬线的时效期,财务计算分析显示其经济效益明显提高。     

82B盘条异常组织在拉拔过程的变形研究

观察82B盘条的组织,发现异常组织(马氏体、网状渗碳体)在拉拔时造成纤维裂纹,夹杂物不造成纤维裂纹,异常组织超过一定的尺寸会造成拉拔断丝,提出消除或减轻82B盘条异常组织的建议。     

高碳钢82B精炼过程中的氮控制

对2008年8月份高碳钢82B两种不同精炼工艺路线的氮含量进行分析，调查各精炼工序氮的变化原因，并采取相应的改进措施，从而在9月份的氮控制上获得比较明显的效果。     

Interface microstructure evolution of dissimilar friction stir butt welded F82H steel and SUS304

The dissimilar butt welded joint of reduced-activation ferritic/martensitic steel (RAF/M) F82H and austenite stainless steel (AISI304 (SUS304)) were studied by friction stir welding. The effect of the position of the steels and tool plunging was considered in order to prohibit the mixing of the F82H and SUS304. When the dissimilar butt welding was performed such that the F82H plate was on the advancing side and the tool was plunged on the F82H side, defect-free joints could be successfully fabricated. Optical microscopy and EDX analysis were used to characterize the dissimilar joint microstructures and the interface. It was confirmed that the dissimilar joint formed no mixed structure and inter-metallic compounds.     

Stabilized discontinuous Galerkin method for hyperbolic equations

In this work a new stabilization technique is proposed and studied for the discontinuous Galerkin method applied to hyperbolic equations. In order to avoid the use of slope limiters, a streamline diffusion-like term is added to control oscillations for arbitrary element orders. Thus, the scheme combines ideas from both the Runge-Kutta discontinuous Galerkin method [J. Scient. Comput. 16 (2001) 173] and the streamline diffusion method [Comput. Methods Appl. Mech. Engrg. 32 (1982)]. To increase the stability range of the method, the diffusion term is treated implicitly. The result is a scheme with higher order in space with the same stability range as the finite volume method. An optimal relation between the time step and the size of the diffusion coefficient is analyzed for numerical precision. The scheme is implemented using the object oriented programming philosophy based on the environment described in [Comput. Methods Appl. Mech. Engrg. 150 (1997)]. Accuracy and shock capturing abilities of the method are analyzed in terms of two bidimensional model problems: the rotating cone and the backward facing step problem for the Euler equations of gas dynamics.