Studies of Electromagnetic Properties of MWCNTs after Electroless Plating with Co-Fe Alloy

A method of electroless plating is utilized to deposit Co-Fe alloy on the surface of multi-walled carbon nanotubes (MWCNTs), and electromagnetic parameters of MWCNTs with and without electroless plating are discussed. The MWCNTs covered by Co-Fe is a desirable light absorbent in wide wave band by utilizing electroless plating process in experiments. Field-emission scanning electron microscope (FESEM) and field-emission transmission electron microscope (FETEM) images as well as energy dispersive spectroscopy (EDS) results are presented to show the morphology, components and electromagnetic parameters of MWCNTs. Electromagnetic properties of MWCNTs are enhanced after electroless plating observed from contrast of results between MWCNTs with and without plating. In conclusion, the covering Co-Fe on the surface of MWCNTs in 2-18 GHz frequency range has better electromagnetic properties. When the material is in the 6.5 GHz electromagnetic waves, the reflection loss is up to ?10 dB, and the bandwidth more than ?4 dB is 5 GHz. The excellent electromagnetic properties make it probable for MWCNTs to be utilized as absorbent in electromagnetic shielding materials.     

结构试验与分析一致性评估技术

介绍了CATAS系统的试验与分析一致性评估技术。通过建立试验结果与计算结果之间的线性回归关系,提出了一致性模糊综合评估方法。在保证一定试验可靠度的前提下,结合区域对比曲线,该方法可以指导修改计算模型。通过对Y7-200A的位移测量和计算结果,验证了该方法的有效性。     

基于Pro/E的装配工装设计与管理系统

应用基于实例推理、参数化设计思想,将三维计算机辅助设计技术和数据库管理技术应用于装配工装的设计中,在Pro/E平台上实现了装配工装设计与管理系统,并介绍了该系统的结构和功能实现方法.     

攻击地面固定目标寻的导弹的一体化制导与控制(英文)

This paper presents a scheme of integrated guidance and autopilot design for homing missiles against ground fixed targets. An integrated guidance and control model in the pitch plane is formulated and further changed into a normal form by nonlinear coordinate transformation. By adopting the sliding mode control approach, an adaptive nonlinear control law of the system is designed so that the missile can hit the target accurately with a desired impact attitude angle. The stability analysis of the closed-loop system is also conducted. The numerical simulation has confirmed the usefulness of the proposed design scheme.     

浅谈住户在装修时的墙体拆除

浅谈住户在装修时什么样的墙体可以拆除，什么样的墙体不可以拆除，及住户需拆除墙体时应办理的手续。     

对乒乓球"落点"的初步应用分析

通过问卷调查,访谈法、训练设计法,分析探讨乒乓球五要素中"落点"的开发、研究,旨在使大家对"落点"有更明确的了解.     

基于积分域匹配滤波的系统误差检测

目标跟踪中,如果用于数据融合的位置或速度测元中存在系统误差,可采用最小二乘意义上的微分平滑进行滤波及系统误差诊断。由于微分平滑精度较低,由此提出积分域匹配滤波,同时用这种方法检测系统误差。数学推导证明了积分域检测系统误差的精度高于微分平滑,仿真结果亦证实了此结论。     

Experimental study of partially-cured Z-pins reinforced foam core composites：K-Cor sandwich structures

This paper presents an experimental study of a novel K-Cor sandwich structure rein- forced with partially-cured Z-pins. The influence of pultrusion processing parameters on Z-pins characteristics was studied and the effect of Z-pins on mechanical properties was disclosed. Differential scanning calorimetry （DSC） and optical microscopy （OM） methods were employed to determine the curing degree of as-prepared Z-pins and observe the implanted Z-pins in the K-Cor structure. These partially-cured Z-pins were treated with a stronger bonding link between face sheets and the foam core by means of a hot-press process, thereby decreasing burrs and cracking defects when the Z-pins were implanted into the Rohacell foam core. The results of the out-of-plane tensile tests and the climbing drum peel （CDP） tests showed that K-Cor structures exhibited superior mechanical performance as compared to X-Cor and blank foam core. The observed results of failure modes revealed that an effective bonding link between the foam core and face sheets that was provided from partially-cured Z-pins contributed to the enhanced mechan- ical performances of K-Cor sandwich structures.     

Bluetooth无线接入技术及其应用

本文首先讨论了蓝牙 (Bluetooth)技术的基本概念 ,然后分析了蓝牙无线接入控制技术的特点 ,并对蓝牙无线接入技术存在的问题及发展方向提出了自己的见解     

Comments on "Unbiased converted measurements for tracking"

We show that there exists a compatibility problem in the derivation of the mean and covariance of the converted measurement errors in L. Mo et al. (ibid., vol.34, no.3, p.1023-7, 1998), and then present a modification to the computation of them, in which both the mean and the covariance are computed strictly conditioned on the measurements.