Improved coupled-mode theory of anisotropic optical waveguides

A coupled-mode equation for anisotropic waveguide systems of arbitrary cross section and general dielectric distribution is derived. Numerical results comparing the exact calculations to those of the method of Hardy et al. (Opt. Lett., vol.11, 742-4, 1986) show that the same accuracy can be obtained not only for TE, but also for TM mode coupling in the case of anisotropic waveguides, and the improved coupled-mode theory is applicable to the situation when moderately strong coupling occurs under the condition where the edge-to-edge separation of two coupled guides D₂ is about 0.1 μm     

Thermal—Mechanical Fatigue Behavior and Life Analysis of Cast Ni—base Superalloy K417

In-phase(IP) and out-of-phase(OP)thermal-mechanical fatigue(TMF) behavior of cast Ni-base superalloy K417 was studied.All experiments were carried out under total strain control with temperature cycling between 400-850℃.Both in-phase and out-of-phase TMF specimens exhibited cyclic hardening followed by cyclic softening at the minimum temperature.Besides,they cyclically hardened in the early stage of life followed by cyclic softening at the minimum temperature.Besides,they cyclically hardened in the early stage of life followed by cyclic softening at the maximum temperature.OP TMF life was longer than of IP TMF.Various damage mechanisms operating in different controlled strain ranges and phasing were discussed.A few life prediction methods for isothermal fatigue were used to handle TMF fatigue and their applicability to superalloy K417 was evaluated.The SEM analysis of the fracture surface showed that transgranular fracture was the principal cracking mode for both IP and OP TMF.Oxidation was the main damage mechanism in causing shorter fatigue life for IP TMF compared with OP TMF.     

我国建筑涂料技术进步简评

从以下诸方面简述我国建筑涂料的技术进步:⑴新品种涂料的研制开发;⑵加强对配套材料及施工技术的研究;⑶超细填料在涂料中的应用;⑷计算机自动配色技术;⑸产品标准的修订;⑹建筑涂料的实用范围扩大。     

浅谈高层建筑火灾扑救

前言伴随着我国经济建设的迅速发展 ,高层建筑已在各大城市大量涌现。大量的高层建筑 ,既为城市的经济发展增添了繁荣的氛围 ,同时又给消防安全提出了新的课题。近年来 ,高层建筑所引发的火灾已成为全世界关注的一个难题。据统计 ,1999年全国共发生高层建筑火灾 112 2起 ,而 2 0 0 0年则猛增到 184 32起。因此 ,加强对高层建筑火灾扑救的研究 ,对缔造良好的消防环境 ,确保经济和社会稳定至关重要。本文仅是作者的一些浅见 ,希望能有可取之处与大家分享。18世纪末至 19世纪 ,欧洲和美国的的工业革命带来了生产力的发展与经济的繁荣。这个时期…     

转移法色交换

将图Ｇ的着色由一种变为中一种，通常用Ｋｅｍｐｅ法以交换。但是，对于某些情况，用此法无效。针对这个问题，本文提出了一种转移法色交换，它适用于平面图着色，方法直观，清晰且有效。     

盛钢桶铝锆碳滑板的研究与生产

通过研究,在盛钢桶用铝锆碳滑板的生产过程中,调整了ZrO2的加入量,添加了复合抗氧化剂,使滑板具用较高的强度和抗氧化性能,提高了滑板的使用寿命.     

非常金猪年本本好礼送Q1

时尚与传统交织的当下,我们已经迎来12年一遇的传统农历新年--金猪年的到来,环顾大街小巷,到处都充满了喜气祥和的节日气氛,采购礼品也被提上了日程.     

Structure and Magnetic Properties of LaCo_(13-X)M_X Intermetallic Compounds

ＳｔｒｕｃｔｕｒｅａｎｄＭａｇｎｅｔｉｃＰｒｏｐｅｒｔｉｅｓｏｆＬａＣｏ＿（１３－Ｘ）Ｍ＿ＸＩｎｔｅｒｍｅｔａｌｌｉｃＣｏｍｐｏｕｎｄｓＷＵＪｉａｎＭｉｎ；ＬＩＦｅｎｇ；ＴＡＩＬｉＣｈｉａｎｄＺＨＥＭＧＱｕｎＳｔｒｕｃｔｕｒｅａｎｄＭａｇｎｅｔｉｃＰ...     

关于布尔函数的二次逼近

本文首先利用矩阵形式引入了二阶ｗａｌｓｈ谱的概念并讨论了其性质，其次引入了二次ｂｅｎｔ函数的概念，同时论述了二次ｂｅｎｔ函数的密码学意义。     

准分子激光的应用

本文介绍了准分子激光器的基本类型、主要应用领域及其与材料相互作用的机理。对准分子激光在电子工业、生物医学和材料加工方面的一些重要应用做了比较详细的论述。