反贪侦查人员出庭作证问题探析

《非法证据排除规定》的施行,改变了长期以来职务犯罪侦查机关办案人员一般不出庭作证的局面。侦查人员出庭作证的确有其必要性,但是要求每一起案件的侦查人员都出庭作证在我国当前国情下是既无可能也无必要,适用时有其限制条件。由于我国目前在法律层面上未对侦查人员出庭作证作出明确、具体的规定,这一制度在贯彻执行中将会面临一些问题,需从转变观念、获取证据、外部协作、保障措施以及培训力度等多个路径应对。     

二类微分系统（Ⅲ）类方程的同宿分支

通过分析未扰系统的同宿轨在小扰动下的稳定流形和不稳定流形之间的相对位置,研究了平面二次微分系统具有如下形式的（Ⅲ）类方程x=-y＋δx＋mxy＋ny^2,y=x（1＋ax＋by）（b≠0,n≠0）的同宿分支极限环的问题．给出了系统分别存在稳定极限环和不稳定极限环的条件．     

Determination of organophosphorus pesticide residues in vegetables by an enzyme inhibition method using α-naphthyl acetate esterase extracted from wheat flour

The widespread use of organophosphorus pesticides (OPs) poses a great threat to human health and has made the detection of OP residues in food an important task, especially in view of the fact that easy and rapid detection methods are needed. Because OPs have inhibitory effects on the activity of α-naphthyl acetate esterase (ANAE) in plants, in this work we evaluated the possibility of detecting OPs in vegetables with ANAE extracted from commercial flour. The limits of detection (LODs) obtained for methamidophos, dichlorvos, phoxim, dimethoate, and malathion in lettuce samples with crude ANAE were 0.17, 0.11, 0.11, 0.96, and 1.70 mg/kg, respectively. Based on the maximum residue limits (MRLs) for OPs in food stipulated by Chinese laws which are 0.05, 0.20, 0.05, 1.00, and 8.00 mg/kg for methamidophos, dichlorvos, phoxim, dimethoate, and malathion, respectively, the esterase inhibition method with crude ANAE had sufficient sensitivity to detect the residues of dichlorvos, dimethoate, and malathion in lettuce, but it could not be used to guarantee the safety of the same samples if methamidophos or phoxim residue was present. The sensitivity of the method was improved by the use of esterase purified by ammonium sulfate salting-out. The LODs obtained for methamidophos and phoxim with purified esterase were lower than the MRLs for these OPs in food. This is a very promising method for the detection of OP residues in vegetables using crude or purified esterase because of its cheapness, sensitivity, and convenience.     

载流圆线圈外空间任意一点磁场的研究

使用极限法和椭圆积分法求出载流圆线圈外空间任意一点磁感应强度．并以此来近似计算载流圆筒在空间任意一点的磁感应强度。     

拉格朗日中值定理的应用

研究了如何应用拉格朗日中值定理求极限、证明不等式、恒等式、判定函数的单调性以及确定方程的根,通过给出相关例子加以说明.     

2D and 3D stability analysis of slurry trench in frictional/cohesive soil

A 2D and 3D kinematically admissible rotational failure mechanism is presented for homogeneous slurry trenches in frictional/cohesive soils.Analytical approaches are derived to obtain the upper bounds on slurry trench stability in the strict framework of limit analysis.It is shown that the factor of safety from a 3D analysis will be greater than that from a 2D analysis.Compared with the limit equilibrium method,the limit analysis method yields an unconservative estimate on the safety factors.A set of examples are presented in a wide range of parameters for 2D and 3D homogeneous slurry trenches.The factor of safety increases with increasing slurry and soil bulk density ratio,cohesion,friction angle,and with decreasing slurry level depth and trench depth ratio,trench width and depth ratio.It is convenient to assess the safety for the homogeneous slurry trenches in practical applications.     

用区间数对需求量和生产量进行模糊化来求解经济生产量模型

在基本的生产库存模型中（即在清晰情况下）,为了求解每周期的经济生产量,总是把每天的需求量和生产量看作常量。但是,在实际中每天的需求量和生产量受各方面偶然因素的影响而有一定的变化,变化范围分别是在某个区间内。且每天的需求量和生产量分别落在这两个区间内的可能性差不多,即可认为这两个量是区间数。为此,我们用区间数对其进行模糊化,从而扩展了该模型的应用范围,对实际的应用将更有参考价值。     

Genotypic and environmental variation in barley limit dextrinase activity and its relation to malt quality

Variation in the limit dextrinase activity of barley malt, and the relationships between limit dextrinase activity and malt quality parameters were investigated using eight cultivars grown at seven diverse locations in China for two successive years. Limit dextrinase activity varied with genotype and location, with the levels ranging from 0.245 U/g to 0.980 U/g. The results showed that the variation in limit dextrinase activity was more attributable to the environment （location and year） than to the genotype. The response of limit dextrinase activity to the environment differed markedly among cultivars, and was reflected by large difference in coefficient of variation of cultivars across diverse locations. Regression analysis showed that limit dextrinase activity was negatively correlated with malt viscosity （r=-0.52, P〈0.01）, positively correlated with Kolbach index （r=0.38, P〈0.01） and malt extract （r=0.30, P〈0.05）, but had no significant correlation with malt protein content and diastatic power.     

等价无穷小求极限问题的探讨

用等价无穷小代换求极限是常用的一种求极限的方法,本文主要从分子分母中含积商,和差因子的两种不同情形分别探讨了求极限的方法和注意点。     

再谈运动训练中的超量恢复区间

超量恢复理论自提出以来争议颇多,主要是没有发现运动员在训练课的间隔恢复时间内出现超量恢复理论中所提出的"超量恢复"现象。笔者认为超量恢复现象客观存在,并且发现恢复过程中内脏疲劳恢复要滞于外周疲劳恢复,而在运动训练实际过程往往是仅限于关注外周指标和运动员的自我感觉为恢复指标,忽视了内脏的疲劳恢复。因此,认为运动训练中的超最恢复有区间的存在。