侵彻型制导炸弹的末制导规律研究

根据被动寻的侵彻型制导炸弹的运动特点,设计了能够满足多项约束指标的滑模制导律,并对滑模稳定性进行了证明。仿真结果表明,该制导律能够满足脱靶量和侵彻型制导炸弹对末端攻角及弹道倾角的要求,对参数摄动具有一定的鲁棒性,说明了所设计制导律的有效性。     

基于一种改进粒子群算法的水下远程武器航路规划

针对水下远程武器航路规划中,采用基本粒子群算法避障出现的航路倒退问题,提出了一种借鉴遗传算法采用粒子对换的改进粒子群优化（PSO）算法,并结合远程武器的航路规划设计模型,应用于水下武器作战仿真系统。计算结果表明,该算法可有效提高远程武器航路规划避障的计算效果,对水下远程武器的作战使用研究具有一定的参考价值。     

一种基于GPS原理的诱偏算法

提出了一种基于GPS导航原理的诱偏算法,通过利用区域映射原理,控制转发式干扰系统,诱偏GPS制导武器使其运行偏离设定的轨迹而至特定的区域,从而实现对特定目标的保护作用.通过仿真计算,显示进攻目标在干扰区域范围之内的航迹变化,从而对诱偏效果进行评估.     

用于相位法激光测距的电路系统设计

本文论述了相位法激光测距的原理和引起误差的原因,提出了电路系统设计方案,着重对频率电路和精神检相电路进行了较为深入的分析与讨论。针对大小角度、零点漂移和信号幅度等原因引起的测量误差,本文提出了具体的解决措施,提高了数字检相电路的测相精度和稳定性,最后给出了测试方法和测试结果。     

Automated optimization of service coverage and base station antenna configuration in UMTS networks

Deployment and maintenance of UMTS networks involve optimizing a number of network configuration parameters in order to meet various service and performance requirements. In this article we address automated optimization of service coverage and radio base station antenna configuration. We consider three key configuration parameters: transmit power of the common pilot channel (CPICH), antenna tilt, and antenna azimuth. CPICH power greatly influences coverage. From a resource management point of view, satisfying the coverage requirement using minimum CPICH power offers several performance advantages. In particular, less CPICH power leads to less interference and higher system capacity. Optimal CPICH power, in its turn, is highly dependent on how the other two parameters, tilt and azimuth, are configured at radio base station antennas. Optimizing antenna tilt and azimuth network-wise, with the objective of minimizing the CPICH power consumption, is a challenging task. The solution approach in this article adopts automated optimization. Our optimization engine is a simulated annealing algorithm. Staring from an initial configuration, the algorithm searches effectively in the solution space of possible configurations in order to find improvements. The algorithm is computationally efficient; thus, we can optimize large networks without using excessive computing resources. We present a case study for a UMTS planning scenario in Lisbon. For this network, automated optimization saves up to 70 percent of the CPICH power used in the reference network configuration. In addition, the optimized network configuration offers significant performance improvement in terms of fewer overloaded cells and lower downlink load factor     

新型自振荡电源转换器VK05CFL

1.技术概述 VK05CFL是一种用于驱动微型荧光灯的自振荡转换器,采用意法半导体的VIPower M3-3专利技术制造而成,允许在同一芯片上集成控制部分和电源级。电源级是一个“发射器开关”,其构成是在级联配置内放置一个双极高压复合晶体管和一个低压MOSFET,因此,在高击穿电     

柔性线型聚能切割器的应用研究

从聚能射流形成及侵彻理论出发,总结了影响聚能射流穿深的因素,根据这些因素的分析及工程实际条件,设计并制造了一种铅质外壳柔性线型聚能切割器,对10 mm厚的45′钢板和斜支撑上截取的钢板进行聚能切割实验,发现线密度为158 9·m-1,炸高为2.4 mm的柔性线型聚能切割器完全贯穿45#钢板和斜支撑上截取的钢板;把此种柔...     

Very Low Degree of Energetic Disorder as the Origin of High Mobility in an n‐channel Polymer Semiconductor

Charge transport is investigated in high‐mobility n‐channel organic field‐effect transistors (OFETs) based on poly{[N,N′‐bis(2‐octyldodecyl)‐naphthalene‐1,4,5,8‐bis(dicarboximide)‐2,6‐diyl]‐alt‐5,5′‐(2,2′‐bithiophene)} (P(NDI2OD‐T2), Polyera ActivInk? N2200) with variable‐temperature electrical measurements and charge‐modulation spectroscopy. Results indicate an unusually uniform energetic landscape of sites for charge‐carrier transport along the channel of the transistor as the main reason for the observed high‐electron mobility. Consistent with a lateral field‐independent transport at temperatures down to 10 K, the reorganization energy is proposed to play an important role in determining the activation energy for the mobility. Quantum chemical calculations, which show an efficient electronic coupling between adjacent units and a reorganization energy of a few hundred meV, are consistent with these findings.     

ZnSe红光和近红外波段双光子吸收的研究

利用一个简化的二能级模型的速率方程来计算双光子吸收系数,讨论了ZnSe的双光子吸收特征,并用此模型计算了ZnSe在600 nm和900 nm的双光子吸收系数.     

试听室声学(四)

上面已经提到，过去提出的一些参数即使都满足，仍然得不到听觉上一致的声场。例如，同样的混响时间由于吸声材料的性质和布置的区别会得到完全不同的音质。这样，人们开始对直达声和反射声的时间结构对听觉心理的影响进行研究，由于研究的角度和侧重点不同，以及对听觉心理影响的评价意见不一致，存在着几种不同的观点。