高功率激光系统中的三程放大器

在高功率钕玻璃激光系统中,使用三程放大技术,从一级钕玻璃放大器(钕玻璃棒φ20×500,双灯泵浦)中获得了约230倍的增益,同时实现了准确的光路延时。     

一种基于沃希变换的测井自动分层方法

介绍了一种利用沃希（Ｗａｌｓｈ）变换实现测井曲线计算机自动分层方法。叙述了Ｗａｌｓｈ变换的基本理论和用于测井自动分层的实现过程。通过实际资料的处理证明,该技术是一种快速、准确的认识岩性界面的方法,具有很好的实用价值。     

利用底栖动物群落特征评价洞庭湖污染的研究

1995 年分别在枯、平、丰水期对洞庭湖的6 个断面底泥进行采样监测,共发现底栖动物58 种,密度为78～544.5 个m2 ,10 种优势种均成聚集分布.采用综合生物污染指数评价水体质量,表明目前整体水质为轻污染,但较1981～1982 年水质明显变差     

线性矩阵不等式F_0＋sum from j＝1 to k of x_j F_

应用矩阵求迹运算“ｔｒ（·）”得到了线性矩阵不等式Ｆ_０＋sum from j=1 to k of ｘ_ｊ Ｆ_ｊ＞０解的充分条件，这些充分条件皆为应用中容易检验的代数不等式．并据此给出了相应的代数解     

初中物理实验目标评估初探

本项实验主要对初中物理学生实验这一薄弱环节进行了研究。文章介绍了＂实验的方法与过程＂，＂初中物理学生实验能力目标＂、＂初中物理学生实验达标评估细则＂．．．．．．。限于篇幅，删去了具体的事例及实验结论篇。     

连铸初始凝固传热系数的测定

本文建立了一套热模拟试验方法，获得了初始凝固过程３ｓ之内的坯壳；提出了考虑固液界面热流的等效凝固潜热计算方法，并据此用一维凝固传热解析法计算出了初始凝固过程的热流分布和传热系数分布，比较和探讨了热顶结晶器材质对初始凝固传热的作用。     

Tissue engineering: creation of long-lasting blood vessels

The construction of stable blood vessels is a fundamental challenge for tissue engineering in regenerative medicine. Although certain genes can be introduced into vascular cells to enhance their survival and proliferation, these manipulations may be oncogenic. We show here that a network of long-lasting blood vessels can be formed in mice by co-implantation of vascular endothelial cells and mesenchymal precursor cells, by-passing the need for risky genetic manipulations. These networks are stable and functional for one year in vivo.     

身体与写作——进入边缘诗学的一个视点

随着女权主义文学批评的兴起,性别与写作的关系也随之受到关注.从这一关系入手,梳理诸如"边缘叙事"、"身体写作"、"女性小说"等概念,可以为边缘诗学的建构提供一个视点.     

Watermarking on 3D mesh based on spherical wavelet transform

In this paper we propose a robust watermarking algorithm for 3D mesh. The algorithm is based on spherical wavelet transform. Our basic idea is to decompose the original mesh into a series of details at different scales by using spherical wavelet transform; the watermark is then embedded into the different levels of details. The embedding process includes: global sphere parameterization, spherical uniform sampling, spherical wavelet forward transform, embedding watermark, spherical wavelet inverse transform, and at last resampling the mesh watermarked to recover the topological connectivity of the original model. Experiments showed that our algorithm can improve the capacity of the watermark and the robustness of watermarking against attacks.