胆总管探查切口的Ⅰ期缝合

目的 :分析胆囊切除术胆总管探查阴性病例的处理方法。方法 :回顾性分析 5 5 2例良性病胆囊切除术连续病例。结果 :胆总管探查 380例中 15 1例探查阴性 ,其中 31例胆总管 期缝合 ,12 0例置 T管引流。结论 :胆总管探查阴性病例在术中胆道镜仔细检查的条件下 ,胆总管探查切口 期缝合是安全的。     

多尺度自适应加权形态边缘检测方法

针对常用的多尺度边缘检测方法因卷积运算造成模糊图像边缘，提出一种多尺度自适应加权形态边缘检测方法，利用大小不同的结构元素提取图像边缘特征，在大尺度下抑制噪声，可靠地识别边缘，在小尺度下定位，再由粗到细跟踪边缘，得到边缘的位置，再由各尺度结构元的抗噪性确定加权值的大小，然后加权处理得到最后的边缘结果，实验表明，用多尺度自适应加权形态边缘检测算法可得到较理想的图像边缘。     

1,1-二甲基肼还原Np(V)的动力学研究

采用分光光度法,对硝酸体系中1,1-二甲基肼还原Np(Ⅴ)的动力学进行了研究,求出了反应的动力学方程.实验结果表明:提高1,1-二甲基肼浓度、增加酸度、升高温度均有利于加快反应速率,离子强度对反应速率的影响很小.     

十次幂和问题的解

给出不定方程１０＝ ｙ１０的一组正整数解     

利用模板实现持久类

介绍了利用模板技术在母语中定义持久类的实现方法．该方法通过抽象持久类的一般特性定义出持久类的共同的类模板，定义持久类的过程就是由类模板生成模板类的过程．该方法完全区分持久语义和挥发语义，能很好地处理属性的多态性，易于管理持久对象，为最终实现面向对象数据库和持久性程序设计语言提供了很好的基础     

单模激光线性模型瞬态的随机共振

根据线性化的单模激光输出光强方程,运用计算光强的相关函数,得到光强的功率谱及信噪比的方法,计算了在δ函数形式关联的两白噪声驱动下单模激光线性模型瞬态的功率谱及信噪比,发现了瞬态的随机共振,研究了信噪比随时间的演化及到达定态的时间,分析了参数对随机共振的影响。     

以分析法比较流体的换热性能

基于换热过程中的损失率能定量地反映该过程中流体的传热与流动的综合性能这一特性，借助换热过程的损失率方程，分析比较了几种流体工质在不同换热方式下的综合特性。比较结果表明，液体（如水）有远优于气体（如空气）的流动与传热的综合性能，且随着流体温度的升高其优势更为明显。同时表明分析法在定量评价换热工质性能的突出特点及工程上的应用价值。     

HIV preferentially infects HIV-specific CD4+ T cells

HIV infection is associated with the progressive loss of CD4(+) T cells through their destruction or decreased production. A central, yet unresolved issue of HIV disease is the mechanism for this loss, and in particular whether HIV-specific CD4(+) T cells are preferentially affected. Here we show that HIV-specific memory CD4(+) T cells in infected individuals contain more HIV viral DNA than other memory CD4(+) T cells, at all stages of HIV disease. Additionally, following viral rebound during interruption of antiretroviral therapy, the frequency of HIV viral DNA in the HIV-specific pool of memory CD4(+) T cells increases to a greater extent than in memory CD4(+) T cells of other specificities. These findings show that HIV-specific CD4(+) T cells are preferentially infected by HIV in vivo. This provides a potential mechanism to explain the loss of HIV-specific CD4(+) T-cell responses, and consequently the loss of immunological control of HIV replication. Furthermore, the phenomenon of HIV specifically infecting the very cells that respond to it adds a cautionary note to the practice of structured therapy interruption.     

磁头定位系统温度特性的仿真研究

用计算机仿真研究磁头定位系统的性能随温度变化的特性，与测试分析相结合，得出了有关宽温带高精度磁头定位系统设计的一些有意义的结论．     

Experimental and numerical study on plasma nitriding of AISI P20 mold steel

In this study, plasma nitriding was used to fabricate a hard protective layer on AISI P20 steel, at three process temperatures (450°C, 500°C, and 550°C) and over a range of time periods (2.5, 5, 7.5, and 10 h), and at a fixed gas N₂:H₂ ratio of 75vol%:25vol%. The morphology of samples was studied using optical microscopy and scanning electron microscopy, and the formed phase of each sample was determined by X-ray diffraction. The elemental depth profile was measured by energy dispersive X-ray spectroscopy, wavelength dispersive spectroscopy, and glow dispersive spectroscopy. The hardness profile of the samples was identified, and the microhardness profile from the surface to the sample center was recorded. The results show that ε-nitride is the dominant species after carrying out plasma nitriding in all strategies and that the plasma nitriding process improves the hardness up to more than three times. It is found that as the time and temperature of the process increase, the hardness and hardness depth of the diffusion zone considerably increase. Furthermore, artificial neural networks were used to predict the effects of operational parameters on the mechanical properties of plastic mold steel. The plasma temperature, running time of imposition, and target distance to the sample surface were all used as network inputs; Vickers hardness measurements were given as the output of the model. The model accurately reproduced the experimental outcomes under different operational conditions; therefore, it can be used in the effective simulation of the plasma nitriding process in AISI P20 steel.