浅析唐朝军事行政法的借鉴价值

唐朝进行了大规模的军事立法活动，形成了较为完备的军事法律制度，其中军事行政法律制度在整个军事法律体系中占有相当重要的位置。虽然它没有现代军事行政法律制度完善，但作为当时世界上国力强大的王朝，在军事行政法制上仍然有值得借鉴的地方。     

当代青少年价值取向研究

社会转型、价值观念的变革对我国青少年的价值取向产生了重大影响，也呈现了新的面貌，具体表现如下：人生价值观日渐趋向多元化；人生行为选择低于理性认识水平，言行脱节现象严重。要改变这样的状况，就需要社会、家庭、学校共同关注，给青少年正确的价值导向。     

挖掘高等数学人文价值,培养大学生探究能力

数学的人文要素对培养学生的探究能力具有重要意义,在数学教学中通过体现数学人文价值来培养学生的探究能力可采取以下几种尝试:介绍古今人们对有关数学方面的认识,帮助学生全方位了解数学;借助数学史料,再现数学知识的发现过程;开展专题研究,师生共同研讨数学知识中隐含的数学思想方法;利用“数学美”,再现数学的人文价值,为此教师需做好两种形态知识的转化工作,树立新型的数学教育信念。     

IIR系统的自适应横向滤波辨识

用自适应线性组合器匹配IIR型离散系统,通过拟合系统传递函数来辨识系统参数;比较了该法与自适应递归算法的动态性能,数值仿真结果证明该法的有效性.     

Development of cost effective personnel armour through structural hybridization

The objective of the present study is to develop cost effective thermoplastic hybrid laminate using Dyneema® HB50 and Tensylon®HSBD 30A through structural hybridization method. Laminates having 20 mm thickness were fabricated and subjected to 7.62 × 39 mm mild steel core projectile with an impact velocity of 730 ± 10 ms⁻¹. Parameters such as energy absorption, back face deformation and rate of back face deformation were measured as a function of hybridization ratio. It was observed that hybrid laminate with 50:50 ratio (w/w) of Tensylon® and Dyneema® with Tensylon® as front face showed 200% more energy absorption when compared to 100% Tensylon® laminate and showed equal energy absorption as that of expensive 100% Dyneema® laminate. Moreover, hybrid laminate with TD50:50 ratio showed 40% lower in terms of final back face deformation than Dyneema® laminate. Rate of back face deformation was also found to be slow for hybrid laminate as compared to Dyneema® laminate. Dynamic mechanical analysis showed that, Tensylon® laminate has got higher stiffness and lower damping factor than Dyneema® and hybrid laminates. The interface between Tensylon® and Dyneema® layers was found to be separating during the penetration process due to the poor interfacial bonding. Failure behaviour of laminates for different hybridization ratios were studied by sectioning the impacted laminates. It was observed that, the Tensylon® laminate has undergone shear cutting of fibers as major failure mode whereas the hybrid laminate showed shear cutting followed by tensile stretching, fiber pull out and delamination. These inputs are highly useful for body armour applications to design cost effective armour with enhanced performance.     

军校学员核心价值观培育之我见

公安边防部队院校学员核心价值观的培育是一项长远的任务,通过政治教育打牢思想理论基础,通过两个＂经常性工作＂不断加强日常养成,通过反复的实践活动检验和升华学员的核心价值观,为学员全面发展和将来更好地履行使命提供强大的精神力量。     

On the exponentially weighted moving variance

MacGregor and Harris (J Quality Technol 25 (1993) 106–118) proposed the exponentially weighted mean squared deviation (EWMS) and the exponentially weighted moving variance (EWMV) charts as ways of monitoring process variability. These two charts are particularly useful for individual observations where no estimate of variability is available from replicates. However, the control charts derived by using the approximate distributions of the EWMS and EWMV statistics are difficult to interpret in terms of the average run length (ARL). Furthermore, both control charting schemes are biased procedures. In this article, we propose two new control charts by applying a normal approximation to the distributions of the logarithms of the weighted sum of chi squared random variables, which are respectively functions of the EWMS and EWMV statistics. These new control charts are easy to interpret in terms of the ARL. On the basis of the simulation studies, we demonstrate that the proposed charts are superior to the EWMS and EWMV charts and they both are nearly unbiased for the commonly used smoothing constants. We also compare the performance of the proposed charts with that of the change point (CP) CUSUM chart of Acosta‐Mejia (1995). The design of the proposed control charts is discussed. An example is also given to illustrate the applicability of the proposed control charts. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

融合初值校准与二阶逼近的单星测频定位算法

为减小单星测频定位的误差,提出一种融合初值校准与二阶逼近的单星测频定位算法。该算法在卫星接收信号多普勒频移为零的时间点,通过测距获得卫星到定位目标的距离信息,利用距离信息修正轨道平面与定位目标的几何关系,为初值的选取提供校准手段;将校准的初值代入含二阶级数的定位方程泰勒展开式,通过较少次数的迭代得到定位目标的真实位置,从而降低定位的算法复杂度,提高定位精度。仿真结果表明,所提出的算法与多普勒单星定位算法相比,迭代次数和定位误差大幅度减小,其实现简单、计算量少、误差小,在单星定位研究领域具有较高的理论价值和实用价值。     

Some new results on the preservation of the NBUE and NWUE aging classes under the formation of coherent systems

We consider the classical problem of whether certain classes of lifetime distributions are preserved under the formation of coherent systems. Under the assumption of independent and identically distributed (i.i.d.) component lifetimes, we consider the NBUE (new better than used in expectation) and NWUE (new worse than used in expectation) classes. First, a necessary condition for a coherent system to preserve the NBUE class is given. Sufficient conditions are then obtained for systems satisfying this necessary condition. The sufficient conditions are satisfied for a collection of systems which includes all parallel systems, but the collection is shown to be strictly larger. We also prove that no coherent system preserves the NWUE class. As byproducts of our study, we obtain the following results for the case of i.i.d. component lifetimes: (a) the DFR (decreasing failure rate) class is preserved by no coherent systems other than series systems, and (b) the IMRL (increasing mean residual life) class is not preserved by any coherent systems. Generalizations to the case of dependent component lifetimes are briefly discussed.     

超声冲击处理改善22SiMn2TiB装甲钢抗应力腐蚀性能研究

采用超声冲击处理工艺对22SiMn2TiB装甲钢试样进行了表面冲击强化,采用四点弯曲加载装置将处理和未处理的试样在3.5%NaCl溶液中进行了150 d的应力腐蚀试验。用X射线应力测定仪测定了应力腐蚀试验前试样表面的残余应力,用扫描电镜和透射电镜观察了处理后试样的断面组织。分析了超声冲击处理引起的残余应力和断面组织变化对改善装甲钢抗应力腐蚀性能的作用。结果表明,超声冲击处理引入的残余压应力和表层晶粒细化可以大大提高22SiMn2TiB装甲钢的抗应力腐蚀性能。