智能实验室管理设想

本文介绍了采用现代物流思想进行物理实验室管理,将物流拣选手段用于物理实验室的管理,促进物理实验室管理现代化．本手段主要利用射频识别技术,依托电子数据管理系统,实现实验器材的动态管理,从而使实验室设备得到最优化应用．     

生命元素与营养、健康的研究现状、问题分析及其展望

综述了生命元素与人类营养和健康的研究现状，并对生命元素研究的局限性和产生问题的原因进行了多角度的探讨。作者认为，今后对生命元素的研究应注重生物有机体中生命元素生态系统的整体性、系统性和元素整体的比例平衡及其互作关系。     

绿色化学教育现状及其面临的挑战

从绿色化学教材、学位设置、学术期刊、研究机构和互联网及奖励等方面介绍了绿色化学教育的发展现状，最后详细分析了绿色化学教育未来发展面临的挑战并提出了应对策略。     

Plasma thiols redox status by laser-induced fluorescence capillary electrophoresis

High concentrations of total plasma thiols such as cysteine and homocysteine are important risk factors for atherosclerosis and cardiovascular diseases. We have recently described a new laser-induced fluorescence capillary electrophoresis (CE-LIF) method to measure total plasma thiols, in which the baseline separation of cysteinylglycine, homocysteine, cysteine, and glutathione was achieved by adding the organic base N-methyl-D-glucamine to the run buffer. However, because the active fractions of homocysteine and cysteine responsible for vascular injuries are still unknown, research calls for a set up of methods able to analyze different forms of plasma thiols. In this paper, we present an improvement of our previous method that allows the measurement of different thiol forms. Total, reduced, and free thiols were measured by varying the order of disulfide reduction with tributylphosphine and proteins precipitation with 5-sulfosalicylic acid. After derivatization with 5-iodoacetamidofluorescein, samples were separated and measured by CE-LIF using a phosphate/borate buffer in the presence of 75 mmol/L N-methyl-D-glucamine. Oxidized thiols and protein bound thiols were calculated by difference, free minus reduced and total minus free form, respectively. Linearity, reproducibility, analytical recovery, and sensitivity were evaluated. The assay was used to measure the thiols redox status in 15 plasma samples from healthy volunteers.     

国内外惯导用中型精密离心机"鸟笼"的发展现状比较分析

详细介绍了国内外(中、美、俄)惯导用中型精密离心机“鸟笼”的发展现状,在此基础上,对我国现阶段研制的“鸟笼”与美国的两代“鸟笼”进行了比较分析,认为我国“鸟笼”现阶段的研制处于国际先进水平。     

机动误差自动补偿在平台罗经中的应用

在平台罗经中,机动误差是影响系统精度的一个重要因素。为了解决这一问题,本文提出了一种对机动误差进行自动补偿的方法,该方法以断摆补偿和加速度补偿为基础,对海情自动判别,从而使机动误差的补偿更加及时、准确,提高了系统精度和可靠性。     

北京市中学化学教师开展探究式教学的现状与分析

利用问卷调查的方式对北京市中学化学教师开展探究式教学的现状和发展需求进行了研究。通过统计和分析调查数据发现,教师获得探究式教学知识的途径主要是职后的培训和学习,并且具有明显的实践性特征;大部分教师了解科学探究相关知识,但他们对科学探究本质的理解还不够深刻;大部分教师认识到了开展探究式教学的重要性,并且开展的是一种教师主导下的、有限度的学生探究,但在诸多因素的制约下教学质量还有待提高。     

沟槽对界面振动及摩擦磨损特性的影响

选用球-面/面-面两种不同的接触模式,分别探究了摩擦界面沟槽的存在对界面振动及摩擦磨损特性的影响.结果表明:沟槽具有捕获磨屑的能力,能够有效地减轻磨屑对界面磨损的影响,但接触模式的不同,沟槽棱边上的振动及摩擦磨损特性差异显著.在球-面接触模式下,沟槽的存在打断了界面的连续接触,导致界面摩擦信号产生突变,此外,球试样滑过沟槽时与沟槽棱边产生的撞击加剧了棱边的磨损,进而影响了沟槽收集磨屑的效率.在面-面接触中,沟槽的存在实时改变了界面的接触状态,从而导致了界面上接触压力的分布发生了转移,从而改变了界面力信号,此外,块试样与沟槽棱边并没有出现明显的撞击作用,因此沟槽的棱边保存得较为完好.     

Consistency and Asymptotic Normality of Estimators in a Proportional Hazards Model with Interval Censoring and Left Truncation

Satten et al. (1998, J. Amer. Statist. Assoc., 93, 318–327) proposed an approach to the proportional hazards model for interval censored data in which parameter estimates are obtained by solving estimating equations which are the score equations for the full data proportional hazards model, averaged over all rankings of imputed failure times consistent with the observed censoring intervals. In this paper, we extend this approach to incorporate data that are left-truncated and right censored (dynamic cohort data). Consistency and asymptotic normality of the estimators obtained in this way are established.     

贵州省安顺市6岁以下儿童营养及健康状况调查

采用随机连片整群抽样,对贵州省安顺市421名6岁以下儿童进行了营养及健康状况调查,结果表明,儿童低体重患病率,生长发育迟缓率均较高,说明儿童营养状况较差,分析了儿童营养不良的原因,并提出了建议。