粉喷桩在某高速公路软基加固工程的应用

在结合具体的工程实践基础上,对利用水泥粉喷桩加固引桥软基的设计施工进行探讨,并针对施工过程中出现的一些问题,给出相应的解决办法,可以供实际工程参考。     

锅炉受热面管定位连接件焊缝开裂原因初探

通过实际案例介绍了锅炉受热面管较常见的定位连接件应力开裂的现象,对受热面在设计和安装过程中存在的问题进行了初步的探讨,提出了应该注意的几个方面的问题。     

托电3号机低压A缸叶片断裂失效分析

托电3号机组低压缸叶片运行仅3个月就发生了断裂。叶片表面存在较严重的点蚀坑,现坑底的能谱分析结果显示存有C l离子。经分析认为,这是一起因水质不良造成的叶片断裂事故。     

A Laplace domain finite element method (LDFEM) applied to diffusion and propagation problems in electrical engineering

This paper presents a new finite element formulation in the Laplace domain for both diffusion and wave equations with applications in the field of electrical engineering. With the aid of congruence transformation of matrices, the finite element equations in the Laplace domain are solved and time-domain results can be obtained through the inverse Laplace transform. In a test problem, good agreement between the numerical results derived with the present method and the analytical solutions has been found. For applications in which only Dirichlet and Neumann boundary conditions are involved, this new finite element approach can be applied and provide both frequency-domain and time-domain results in one run without any timestepping scheme. The limitations of using the congruence transformation in solving propagation problems are also addressed in this paper.     

便携式傅里叶变换红外光谱仪在大气温室气体观测中的应用进展

大气温室气体柱浓度地基遥感观测是碳监测卫星验证和校正的有效手段,目前主要依赖于昂贵且移动困难的高分辨率傅里叶变换红外光谱仪(120/125 HR).采用便携式较低光谱分辨率(0.5cm-1)傅里叶变换红外光谱仪(EM27/SUN)进行温室气体柱浓度的监测提供了一种新型的便捷手段.EM27/SUN通过自带的太阳跟踪器记录...     

Power Allocation for NOMA in D2D Relay Communications

Non-orthogonal multiple access(NOMA)is considered as one of the key technologies for the fifth generation(5G)wireless communications.The integration of NOMA and device-to-device(D2D)communications has recently attracted wide attention.In this paper,a relaying D2D communications assisted with cooperative relaying systems using NOMA(DRC-NOMA)is considered.We analyze the ergodic sum-rate for the proposed system and then derive the closed-form expressions.In addition,an optimal power allocation strategy maximizing the ergodic sum-rate is proposed based on these analysis results.Numerical results show the good agreement between the results of analysis and Monte Carlo method.The proposed DRC-NOMA has a great improvement of the ergodic sum-rate in the small regime of average channel gain of D2D pair.     

自主创新是民营企业强盛之魂

企业是人类社会进步的重要载体,优秀的企业不断进行技术创新、管理创新和文化创新。传化集团20年的实践表明自主创新是民营企业的必然选择,民营企业自主创新首要的是理念创新,自主创新成就民营企业新的天地,自主创新始于企业内在觉悟;创新工作需要创新精神支撑,需要创新的文化、创新的制度和创新的组织,需要激发创新者,需要战略性投资。     

TiO2的非金属掺杂改性研究进展

TiO2具有无毒、化学性能稳定、价格便宜和不产生二次污染等特点,被认为是最有应用前景的光催化剂.但TiO2的吸收光谱在紫外光区,对太阳光的利用率低,影响了TiO2光催化技术的推广应用.对TiO2进行改性提高它在可见光区的光催化活性是近几年研究的热点.综述了近年来利用非金属如N、F、S、C等对TiO2进行改性的研究,对改性方法进行了比较,并评价了各种离子改性的效果.     

聚合物基导热复合材料研究进展

概述了聚合物基导热复合材料的应用开发背景,从理论上阐述了聚合物基导热复合材料的导热机理及导热理论模型.综述了国内外聚合物基导热复合材料研究开发状况,提出了今后的研究方向.