板坯结晶器钢水凝固的数值模拟

以实测结晶器铜板温度计算的热流量作边界条件,采用有限元方法,建立了结晶器内凝固传热方程.对凝固传热方程进行了离散化,利用ANSYS商业软件进行求解,得到凝固坯壳的应力、应变情况,从而确定连铸结晶器壁的合理锥度.     

A rapid and accurate 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide colorimetric assay for quantification of bacteriocins with nisin as an example

The objective of this study is to propose a more accurate and faster MTT [3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide] colorimetric assay (MCA) for quantitative measurement of polypeptide bacteriocins in solutions with nisin as an example. After an initial incubation of nisin and indicator bacterium Micrococcus luteus NCIB 8166 in tubes, MTT was added for another incubation period. After that, nisin was quantified by estimating the number of viable bacteria based on measuring the amount of purple formazan produced by cleavage of yellow tetrazolium salt MTT. Then MCA was compared to a standard agar diffusion assay (ADA). The results suggested a high correlation coefficient (r ²=0.975±0.004) between optical density (OD) and the inhibitory effect of nisin on a bacterial strain Micrococcus luteus NCIB 8166 at a range of 0.125~32 IU/ml. The MCA described in this study was very quick. Quantification of nisin took only 7~8 h and the detection limit was at the level of 0.125 IU/ml when compared to 12 IU/ml and 24~28 h for ADA. The MCA provides an accurate and rapid method for quantification of nisin in solutions and is expected to be used for quantification of other antimicrobial substances.     

TKSS—C型信号与系统实验箱的低通滤波器分析

对TKSS-C型信号与系统实验箱的低通滤波器实验模块进行了s平面几何分析，并利用MATLAB7．01中的Power Systems Blockset对其进行了仿真．     

Amniotic membrane transplantation for porous sphere orbital implant exposure

Objective: This study is aimed at describing the clinical outcome of amniotic membrane transplantation for exposure of porous sphere implants. Methods: A retrospective review of consecutive cases of porous sphere orbital implant exposure was carried out. Eight cases were presented between May 2004 and Oct. 2006 (5 males, 3 females; mean age 44.5 years). Six had enucleation and two had evisceration. Exposure occurred in two primary and six secondary. Orbital implant diameter was 22 mm in seven cases and 20 mm in one case. Six patients are with hydroxyapatite and two with high-density porous polyethylene (Medpor) orbital implants. The mean time from implantation to exposure was 1.1 months (range 0.8~2 months). All patients required surgical intervention. Results: The time of follow-up ranged from 3.0 to 28.0 months (mean 16.5 months). Amniotic membrane grafting successfully closed the defect without re-exposure in all of these patients. The grafts were left bare with a mean time to conjunctiva of about 1 month (range 0.8~1.5 months). Conclusion: Exposed porous sphere implants were treated successfully with amniotic membrane graft in all of patients. The graft is easy to harvest. This technique is useful, dose not lead to prolonged socket inflammation and infection, and it is valuable application extensively.     

浅谈利用任务驱动法进行单片机教学与职业核心能力的培养

本文就任务驱动法在单片机教学中的应用与职业核心能力培养进行了阐述，并且以实例的形式得到了很好的验证。     

南水北调工程交叉建筑物可靠度与投资最优配置问题

南水北调中线工程是长距离串联系统,工程的防洪风险较大,投资规模巨大.如何在结构可靠度与工程造价这对矛盾体中寻求最佳组合,往往是工程规划关注的焦点.以可靠度理论为基础,通过考虑随机因素的随机特征,建立了长距离输水工程交叉建筑物的综合可靠度估算方法,并通过优化算法探讨了南水北调中线工程河北段12座渡槽形成的串联系统的整体可靠度与工程造价的最优分配问题.在保证工程总体可靠度的情况下,给出了各交叉建筑物的最优投资方案和相应的可靠度.     

高职院校"软件蓝领"人才培养的探索与实践

结合教学实践,介绍了高职高专院校如何以管理信息系统课程的实践性教学为切入点培养"软件蓝领"人才的实践。     

论学生创造能力的培养

分析了培养学生创造能力的重要性,指出传统教学模式存在的弊端,论述了培养学生创造能力的方法,介绍了一种创造教育教学模式——创造性问题解决教学模式。     

新农村建设规划中存在的问题及对策

对新农村建设规划现状及存在的问题进行了分析,并提出了相应的对策。     

基于时态关系模型的儿童保健系统的设计研究

根据当前时态数据模型的理论,为儿童保健管理信息系统建立了一个可行的时态关系模型,并对系统中的查询做了简单的描述,最后分析了这种建模方法的优缺点.