Pattern Effect Removal Technique for Semiconductor-Optical-Amplifier-Based Wavelength Conversion

A technique to overcome pattern dependence in semiconductor-optical-amplifier-based wavelength converters is presented. The technique is based on a careful selection of red- and blue-shifted spectral components having complementary pattern effects in the output spectrum of a wavelength-converted signal. Significant signal quality improvements are reported at a bit rate of 40 Gb/s.     

大花水水电站首部枢纽布置设计

大花水水电站首部枢纽由碾压混凝土拦河大坝、泄洪建筑物和电站进水口组成。大坝采用河床拱坝 左岸重力坝的组合坝型,拱坝最大坝高134.50 m,重力坝最大坝高73 m。泄洪建筑物布置在拱坝坝身,为3个表孔 2个中孔的布置型形式。电站进水口布置于左岸重力坝坝身。首部枢纽布置紧凑,而且充分考虑了坝址区河谷狭窄、地形地貌及、存在的地质缺陷,以及泄洪流量大等工程特点。本文重点介绍首部枢纽的布置设计比选过程。     

大庆油田油气勘探“五五”工程的实践与效果

大庆油田公司确立的油气勘探“五五”工程的核心是立足油气勘探长远发展、统筹老区与新领域勘探,兼顾工程实施与地质研究、系统配套相关技术理论,内容是调整工程和投资结构、完善油气勘探地质理论、发展各项适用技术,目的是促进油气勘探寻求大发现、获得大突破。通过实施“五五”工程,勘探工作运行平稳,勘探成果殷实丰硕,勘探领域层次分明,对油气勘探工作的发展产生了巨大的推动力,确保了大庆探区油气勘探实施的效果。通过对油气勘探“五五”工程实践过程的深入剖析,认为在油气勘探中“思路决定出路、前置加载量是基础、新技术应用是关键”。     

我国房地产税收政策调整的意义与影响

一、房地产业政策执行年任务艰巨 如果说2006年是我国房地产业的“政策年”，那么2007年无疑就是我国房地产业的“执行年”。一方面，去年国务院及相关部门发布的许多调控政策在渡过其最初的适应期后，将充分释放其效力；另一方面，国家相关部门必然会针对之前公布的一些政策法规，出台一系列相应的实施细则，以确保我国房地产市场健康、稳定发展，从调整税收政策和供求结构的角度来满足目前强劲的需求。由此可见，2007年注定是我国房地产业不寻常的一年。     

企业开展质量成本研究工作的思考

质量成本是指企业为保证产品质量而支出的一切费用，以及产品质量未达到规定的标准而造成的一切损失的总和。开展质量成本研究工作是企业深化质量管理和成本管理的一条有效途径。     

广东省大型工程建设中天然放射性核素引起的环境问题

本文介绍了广东省境内几个大型基本建设工程项目中天然放射性核素引起的环境问题及有关治理对策，并就今后类似建设项目的辐射环境保护工作提出了建议。     

关于引入劳动力市场价位的思考

引入劳动力市场价位是企业薪酬制度改革的必然趋势。系统研究和分析了劳动力市场价位的基本特征;提出企业在引入劳动力市场价位过程中应该遵循的基本原则。     

TD-SCDMA技术及市场分析

TD-SCDMA技术优势 2000年5月,在土耳其伊斯坦布尔召开的国际电联大会上,TD-SCDMA被国际电联接纳为第三代移动通信系统标准之一,这标志着中国在移动通信技术领域已经进入世界先进行列.     

Sol-gel Preparation and Preliminary in vitro Evaluation of Fluorapatite／Hydroxyapatite Solid Solution Films

Fluorapatite/hydroxyapatite solid solution has better biological properties than other apatites, especially used as films or coatings. In this work, sol-gel preparation and in vitro behavior of fluorapatite/hydroxyapatite solid solution films on titanium alloy were investigated. Ca(NO3)2-4H20 and PO(OH)x(OEt)3-x were selected as precursors, and hexafluorophosphoric acid (HPFo) was used as a fluorine containing reagent. The Ca and P precursors were mixed with HPFo to keep the Ca/P molar ratio 1.67. The mixtures refluxed for 12 h were used as dipping sols for the preparation of the films. The phase of the films obtained at 600℃ was apatite. The F contents in the films increased with the concentrations of HPF6 in the dipping sols. The solid solution films were shown to have better stability than hydroxyapatite films, and a reasonably good bioactivity in the in vitro evaluation.     

Catalytic dehydrogenation of ethylbenzene with carbon dioxide: promotional effect of antimony in supported vanadium–antimony oxide catalyst

Alumina-supported vanadium oxide, VO_x/Al₂O₃, and binary vanadium–antimony oxides, VSbO_x/Al₂O₃, have been tested in the ethylbenzene dehydrogenation with carbon dioxide and characterized by S_BET, X-ray diffraction, X-ray photoelectron spectroscopy, hydrogen temperature-programmed reduction and CO₂ pulse methods. VSbO_x/Al₂O₃ exhibited enhanced catalytic activity and especially on-stream stability compared to VO_x/Al₂O₃ catalyst. Incorporation of antimony into VO_x/Al₂O₃ increased dispersion of active VO_x species, enhanced redox properties of the systems and formed a new mixed vanadium–antimony oxide phase in the most catalytically efficient V_0.43Sb_0.57O_x/Al₂O₃ system.