Bionic stab-resistant body armor based on triangular pyramid structure

A stab-resistant substrate was designed and realized with a triangular pyramidal structure, inspired by the biological armor model in nature. The stab-resistance behavior and dynamic response mechanisms were studied through numerical simulation and experimental testing of a knife impacting a substrate, and an optimal structural design was obtained accordingly, with a tilted angle of 22.5° and optimal thickness of 1.2 mm. It was shown that the triangular pyramidal structure generated twice the internal energy of the knife than the flat substrate due to the dispersing effect of the structure. The force parallel to the inclination caused a significant scratch on the substrate surface, while the force perpendicular caused obvious substrate deformation. A new riveting method was used to form the total layer, which passed the GA 68—2008 standard. The stab-resistant clothing coupled with the reduced wearing burden could provide effective protection and avoid fatal injuries on security personnel working in dangerous environments. The method provided may enlighten the future design and manufacturing of stab-resistant clothing.     

Partial penetration of annular grooved projectiles impacting ductile metal targets

Changing and optimizing the projectile nose shape is an important way to achieve specific ballistic performance. One special ballistic performance is the embedding effect, which can achieve a delayed high-explosive reaction on the target surface. This embedding effect includes a rebound phase that is significantly different from the traditional penetration process. To better study embedment behavior, this study proposed a novel nose shape called an annular grooved projectile and defined its interaction process with the ductile metal plate as partial penetration. Specifically, we conducted a series of low-velocity-ballistic tests in which these steel projectiles were used to strike 16-mm-thick target plates made with 2024-O aluminum alloy. We observed the dynamic evolution characteristics of this aluminum alloy near the impact craters and analyzed these characteristics by corresponding cross-sectional views and numerical simulations. The results indicated that the penetration resistance had a brief decrease that was influenced by its groove structure, but then it increased significantly-that is, the fluctuation of penetration resistance was affected by the irregular nose shape. Moreover, we visualized the distribution of the material in the groove and its inflow process through the rheology lines in microscopic tests and the highlighted mesh lines in simulations. The combination of these phenomena revealed the embed-ment mechanism of the annular grooved projectile and optimized the design of the groove shape to achieve a more firm embedment performance. The embedment was achieved primarily by the target material filled in the groove structure. Therefore, preventing the shear failure that occurred on the filling material was key to achieving this embedding effect.     

大温差条件下碳纤维混凝土无约束变形试验

为了研究碳纤维、聚酯纤维对混凝土在自由条件下的约束作用,通过设计对碳纤维混凝土、聚酯纤维混凝土和素混凝土加热放热试验,比较掺入不同纤维体积分数的纤维混凝土在大温差条件下无约束自由变形的差异,并用温度线膨胀系数表达。对试验数据进行分析,得到体积分数为1%的碳纤维混凝土比素混凝土抗自由变形能力提高了38.8%,在本试验的各种体积分数中效果最好。结果表明碳纤维与混凝土,虽然热力学性能不同,但是二者结合之后碳纤维因其高弹性模量的特性,反而可以更好地抑制混凝土自由变形。试验效果也表明,随着施工工艺的完善,碳纤维体积分数可能会超过1%,碳纤维对混凝土性能的提升仍然有很大的帮助。     

基于有限理性理论的虚拟士兵感知行为建模研究

针对当前虚拟士兵感知行为模型的缺陷,介绍有限理性理论和基于有限理性虚拟士兵的概念,分析了加入有限理性理论的虚拟士兵的特点,提出了基于有限理性虚拟士兵的感知行为模型。该模型包括有限视觉模型、有限听觉模型和有限记忆模型,基于该感知模型的虚拟士兵在感知、决策和运动能力方面与类似真实士兵具有较高的一致性。这对虚拟士兵的感知行为建模研究具有一定的探索意义。     

论“香草美人”的原型意象及在《聊斋志异》中的范变

本文运用"神话———原型"理论从宗教祭祀的角度,探讨了九歌的性质、意义,指出《离骚》的诞生是源自九歌的祭祀仪式,并从此形成"香草美人"原型意象,随文化的传承积淀在集体无意识之中,裹挟着屈原的人格魅力和深沉温馨的原型意象经蒲松龄强烈而丰富的个体意识被激活,于《聊斋志异》中深沉地勃发,并被赋予崭新的内涵。     

用心理咨询理论提高个别谈心的实效

个别谈心是经常性思想工作的基本形式和方法。现代心理咨询学的兴起,为人与人之间通过以语言为媒介进行有效沟通,创建了一种极具人文关怀的模式,值得军队经常性思想工作在个别谈心中借鉴。个别谈心可以通过借鉴心理咨询中咨询关系的建立原则,营造平等、和谐的个别谈心氛围;借用心理咨询中的倾听技术、提问技术和影响性技术,不断提升个别谈心的艺术。     

实弹射击弹着点定位算法研究

弹着点定位是实弹射击中实现自动报靶的关键。利用弹头撞击钢质靶板产生的振动波到达四个顶点上的振动传感器的时间差,来实现弹着点的定位。弹着点的位置定位算法,利用两次加权的方法,消除噪声等因素产生的误差,最后经过实验测试,分别对一次、二次加权的结果进行仿真以及数据的拟合。结果证明,该算法对弹着点的位置估计随着加权次数的增加,也会更加接近实际值。     

基于全相位的同频融合分层算法

同频融合算法在处理频率快速变化的信号等应用中具有精度高、抗噪性好的优点,然而该算法实时性较差且精度受相位差测量影响较大。提出了基于全相位的同频融合分层算法,通过设计分层算法以减少多重循环中的冗余计算单元,可在不牺牲精度的前提下成倍降低运算量;采用全相位谱分析法降低相位差测量误差,明显改善了相位差补偿效果。理论分析与对比实验表明,该算法对同频融合过程有显著的改进效果。     

Single channel source separation of radar fuze mixed signal based on phase difference analysis

A new method based on phase difference analysis is proposed for the single-channel mixed signal separation of single-channel radar fuze. This method is used to estimate the mixing coefficients of de-noised signals through the cumulants of mixed signals, solve the candidate data set by the mixing coefficients and signal analytical form, and resolve the problem of vector ambiguity by analyzing the phase differences. The signal separation is realized by exchanging data of the solutions. The waveform similarity coefficients are calculated, and the time–frequency distributions of separated signals are analyzed. The results show that the proposed method is effective.     

觉察压力、社会支持、健康行为关系的路径分析

目的：综合研究觉察压力、社会支持和健康行为间的关系。方法：在问卷调查的基础上采用路径分析的方法,建立三者之间的结构方程模型并进行验证。研究工具：调查问卷：觉察压力量表;领悟社会支持评价量表;报告健康行为量表。结果：①问卷内部一致性信度为：0.701-0.802。②模型各拟合指数为：χ^2/df=1.34（χ^2=104.481,df=78）;GFI（拟合优度指数）=0.898;AGFI（调整拟合优度指数）=0.900;NFI（规范拟合指数）=0.926,TLI（Tucker-Lewis指数）=0.897;CFI（比较拟合指数）=0.912;RMSEA（近似误差均方根）=0.051。说明模型拟合情况良好。结论：应综合开展包括：压力应对、建立社会支持环境、培养良好生活方式在内的心理健康教育。