基于EDEM的混凝土板桩静压贯入过程三维颗粒流数值模拟

针对混凝土板桩在干粗砂地基中的静压贯入问题,为了明确贯入过程中的挤土效应及贯入阻力的发展规律,利用离散元数值模拟软件EDEM(Engineering Discrete Element Method)对干粗砂中混凝土板桩静压贯入过程进行了三维数值模拟。为此,提出了适用于类似试验的参数标定方法,分析了贯入过程中颗粒的运动特征。针对板桩结构的特点,对长边和短边方向的挤土效应进行了对比,并以短边为例,分析了不同高度处的挤土效应。最后,根据颗粒与桩结构的接触力,提取了桩端阻力和桩侧摩阻力的值,分析了两者在贯入过程中的变化规律。结果显示:在贯入过程中,颗粒的运动呈现"涡流状",并随贯入过程演化;板桩沿短边方向的表面隆起量约为沿长边方向的隆起量的2倍;随着长宽比的增加,板桩结构在短边方向和长边方向的隆起值相应增加,且短边方向的隆起值与长边方向的隆起值的比值与相应板桩的长宽比近似相等;随着贯入的进行,桩侧摩阻力所占的比重逐渐增加,在完全贯入后,侧摩阻力值约占桩端阻力的1/25;不同长宽比的板桩结构,其桩端阻力和桩侧摩阻力的单位值近似相等,并与准二维计算结果相近。     

MIMO radar waveform design in the presence of clutter and colored noise

The existing MIMO radar waveform design methods only deal with the optimization of radar waveform with the presence of clutter or colored noise, and unfortunately can not get the optimal waveform with the scenario when the clutter and colored noise coexist, which is more realistic in practical applications. To address this problem, a novel MIMO radar waveform design method based on mutual information in the presence of clutter and colored noise is proposed. The proposed scheme considers the influence of the target's response, clutter and colored noise on the optimization of the radar waveform. The mathematical expression for the transmit waveform matrix is achieved by theoretical derivation. What is more important, an optimal pairing of the eigenvectors of the target, clutter and colored noise is given and the power allocation for each antenna is optimized by the water-filling method. Simulation results show that when the total transmit power is 10dB, the proposed method's MI is 8bit and 4bit more than that of the general water-filling method and the method which only considers the pairing of the target's response and noise, respectively.     

Sealing of Ejection Hole at the Bottom of Projectile for Wired Transmission System of Penetration Data

It is difficult to find the projectile when people want to get the penetration data in a hard recovery method, so a recovery system of penetration data is designed based on an ejection mode from the projectile base and a method of wired transmission, at the same time, the system was sealed with a designed sealing device, the working principle of which was introduced. Using Fluent as the simulation platform, the transient pressure of seal cavity was simulated based on the change of chamber pressure, and steady-state pressure of seal clearance and seal cavity were simulated based on the maximum chamber pressure. The sealing performance was tested by a pressure test system. The results of simulation and experiment show that the maximum pressure of seal cavity is 139.4.kPa when the maximum chamber pressure is 242.9.MPa and the maximum temperature of gunpowder explosive gas is 2.166.5.K, so the sealing performance can be assured. The sealing device can be taken as a reference in sealing research on gunpowder gas at the bottom of projection.     

深厚淤泥中双排钢板桩结构安全稳定性研究

针对滨海地区深厚淤泥地基中双排钢板桩围堰结构受力复杂的问题,基于土力学理论,分别从运行工况下的抗剪切变形稳定、底部抗隆稳定、整体抗滑移稳定、抗倾覆稳定以及整体滑动稳定等方面进行分析,给出了安全稳定计算公式,同时通过数学理论推导计算,给出了钢板桩最小入土深度计算公式。以浙江省某大型围垦工程水闸的双排钢板桩围堰工程为例,依据该计算公式,得出最小入土深度建议值为17.01 m,与工程实际设计值18.50 m基本一致;同时利用有限元计算软件,对该工程中双排钢板桩围堰结构进行数值模拟计算分析,并将模拟结果与钢板桩实际水平变位监测资料进行对比分析,认为该双排钢板桩围堰结构设计安全可靠,可为相关工程应用提供参考。     

基于小波分形理论的风电轴承故障识别

针对风电轴承振动特征信号易被环境噪声调制污染、信噪比低、具有非线性和不平稳的特点,利用基于小波分形的故障识别方法对此进行了研究.采用小波包分解,利用互信息法和Cao算法分别确定了相空间的延迟时间和嵌入维数,根据不同频带的关联维数变化确定风电轴承的工作状态.该方法不依赖于风力机工作的动力学模型,对整体系统信息状态变化敏感.通过现场实验证明,该方法较好地解决了风电轴承故障难以识别的问题,为更加细致地研究风电轴承振动信号提供了重要参考.     

不同缝纫工艺下缝纫阻力的测试与分析

本文采用LM缝纫性测试仪对不同缝纫工艺下的针织物和机织物缝纫阻力进行了测试.测试了织物层数、织物正反面以及缝纫方向不同时,面料缝纫阻力的大小;测试了不同缝针、缝纫线时的缝纫阻力.实验结果表明:织物的缝纫阻力随织物的层数增加而成倍数以上的增大;机织物在45°角左右缝纫时,缝纫阻力最大;针织物在接近纵行和横列方向,缝纫阻力出现最大值;穿引缝纫线会增大缝纫阻力,但缝纫线对缝纫阻力的增大作用较缝针的作用微弱.同时,实验过程中还发现,针织物的缝纫阻力比机织物的不匀率高,缝针刺到纱线上的概率高,因此针织物不易于缝纫.本论文的研究,希望对服装加工给予帮助,以提高服装质量和服装加工效率.     

感知神经网络的信息传输及电路实现研究

为提高神经元网络信号的传输效率,改善人们对外界刺激的感知能力,本文采用平均互信息量的评价方法,研究了费茨休夫-南云感知神经元模型中信息传输的随机共振现象,探讨了并联单层神经元网络和双层神经元网络的信息处理功能,并用PSpice电路对神经元网络的信息传输进行了实验验证。数值模拟与电路仿真结果表明,FHN神经元并联模型和双层神经元网络具有随机共振现象,在一定的噪声强度范围内,双层神经元网络对输入信号的响应好于单层神经元网络,噪声能够提高神经元网络的输入输出互信息量,平均互信息量的最大值对应最优的传输性能,证明噪声对神经网络信息传输具有增强作用。该研究对感知神经元群体的信息传输具有重要的启示意义。     

基于语文教学中渗透德育教育的探索

语文是基础教育的重要学科,也是思想道德建设的主要阵地。本文将从语文教学过程中如何进行德育教育,如何使学生在学习知识的同时学会做人处事谈一些体会,并就二者的关系以及具体的教学案例进行探讨,旨在从教学方法、情感熏陶、深挖教材这三方面着手进行语文教学中渗透德育教育的经验探索和推广。     

住房分配与保障：一个民生议题

计划经济时代的城市住房分配采取反市场的再分配模式,单位间与单位内的等级秩序是住房分配的表征。转型经济时期的住房分配则采取以市场为导向的分配模式,住房市场是一种混合市场,由官僚结构、单位因素、家庭结构及早期房改制度等共同左右。在这种情况下,市场与再分配存在相互强化,结果导致“强市场强制度”的过度保障、“超强制度”的错位保障及“弱制度弱市场”的缺位保障,这些问题应是未来制定住房政策的关注焦点。     

Kinetic analysis of cellular internalization and expulsion of unstructured D-chirality cell penetrating peptides

Most cell penetrating peptides (CPPs) are unstructured and susceptible to proteolytic degradation. One alternative is to incorporate D-chirality amino acids into unstructured CPPs to allow for enhanced uptake and intracellular stability. This work investigates CPP internalization using a series of time, concentration, temperature, and energy dependent studies, resulting in a three-fold increase in uptake and 50-fold increase in stability of D-chirality peptides over L-chirality counterparts. CPP internalization occurred via a combination of direct penetration and endocytosis, with a percentage of internalized CPP expelling from cells in a time-dependent manner. Mechanistic studies identified that cells exported the intact internalized D-chirality CPPs via an exocytosis independent pathway, analogous to a direct penetration method out of the cells. These findings highlight the potential of a D-chirality CPP as bio-vector in therapeutic and biosensing applications, but also identify a new expulsion method suggesting a relationship between uptake kinetics, intracellular stability, and export kinetics.