Photoluminescence and heavy doping effects in InP

Photoluminescence (PL) studies on LPE-grown InP layers doped with selenium and having carrier concentrations from 1 × 10¹⁸ to 1 × 10²⁰ cm⁻³ have been reported in this paper. Measurements at 300 and 77 K showed that the band to band recombination peak energy shifts to values as high as 1·7 eV with increasing doping, the increase being sharp beyond 4 × 10¹⁹ cm⁻³. These results have been explained as being the result of the Burstein shift and the band-gap shrinkage.     

An iterative calculation of eddy-current responses due to three-dimensional defects

An iterative technique utilizing a volume integral formulation and a stationary expression for the eddy-current response is discussed and applied to defects of spherical and cylindrical geometry in a conducting half-space. The computations converge in one to four iterations and give known results for small spherical defects. The technique is computationally stable and will efficiently handle defect dimensions at least up to several skin depths. The air-metal interface is considered by means of image theory.     

浅述留矿采矿法在我国的应用

详述了我国黄金资源的特点，以及留矿采矿法的开采技术条件和采矿工艺，介绍了留矿采矿法在应用过程中存在的问题，以及改进后的多种变形方案，提出了留矿采矿法进一步完善和研究的方向。     

超长混凝土结构收缩当量温差计算分析

本文通过对国内外混凝土收缩研究成果的总结归纳,给出超长混凝土结构收缩当量温差的取值计算方法,希望能为同类工程提供有益借鉴。     

地震频谱分解技术应用中有关问题的讨论

薄层反射在频率域会出现陷频现象,其陷频周期的倒数等于薄层的时间厚度.频谱分解技术以此为理论基础对地层厚度进行预测.从此原理出发,阐述了频谱分解技术对原始地震数据体的高保真要求和定义频率范围的原则.实际应用时,利用沿层调谐体,通过求取频率域第一优势频带的频率进行地层厚度预测;利用各单一频率调谐体对薄层进行检测,利用调谐能量的变化对横向不连续的地质异常体空间分布特征进行描述.实际应用结果表明,频谱分解技术比传统的基于时间域地震主频的方法对地质体有更高程度的识别.     

微米级炸药晶体缺陷的微距工业CT试验研究（英）

The structure of a typical crystal explosive(HMX)was studied with loose normal and recrystallized grains by 225 kV micro-focus X-ray industrial volume CT(μVCT).The micro-hole ratio was quantitatively analyzed with dimension of 0.2-1 mm.The cubic array of attenuation coefficient restoration of sample was obtained with the voltage of 130 kV and the current of 50 mA and the dimensional resolving power of 7.1 μm.     

Constructive Volume Geometry

We present an algebraic framework, called Constructive Volume Geometryn (CVG), for modelling complex spatial objects using combinational operations. By utilising scalar fields as fundamental building blocks, CVG provides high-level algebraic representations of objects that are defined mathematically or built upon sampled or simulated datasets. It models amorphous phenomena as well as solid objects, and describes the interior as well as the exterior of objects. We also describe a hierarchical representation scheme for CVG, and a direct rendering method with a new approach for consistent sampling. The work has demonstrated the feasibility of combining a variety of graphics data types in a coherent modelling scheme.     

混凝土多孔砖干燥收缩性能研究

对混凝土多孔砖试块进行了连续60d干燥收缩变形的试验，通过对其在标准养护和自然养护环境中收缩性能的研究，分析了环境温度、相对湿度及龄期对混凝土多孔砖收缩变形的影响，并提出了考虑这些因素的混凝土多孔砖收缩变形估算公式。研究结果可为我国混凝土多孔砖在工程中的应用提供参考依据。     

CASS成图软件在降雨量和蒸发量整编中的应用

数字化成图技术为降水量、蒸发量的等值线图的构建开辟了新的途径,它在确保精度的前提下,可提高工作效率.由此介绍如何运用CASS成图软件绘制降水量和蒸发量等值线图.     

利用压电薄膜设计体积位移传感器

以不同边界条件的振动板为例,提出利用模态方法和分部积分方法设计PVDF传感器测量体积位移。模态正交性设计方法只能满足单一边界条件振动板结构体积位移的测量,而根据分部积分方法设计得到的PVDF传感器,适合一定边界范围的振动板的体积位移测量,并且所设计的PVDF传感器形状与激励力性质(类型、位置和频率范围)以及振动板本身的材料特性无关。