小巧精致——明基Joy Bee DA120 MP3播放器

打开包装，翻开琳琅满目的附件，小小的MP3机才出现在眼前。拿到手的第一感觉：四个字——小巧精致!桔红色纯金属外壳，简单长方体造型，亮银按钮，表面拉丝金属Logo。整个机器简约、小巧、精致，完全给人一种高档时尚产品的感觉，笔者不由得联想到了ZIPPO这个经典品牌的打火机，两者的造型、大小、精致都有共同之处。     

Formation of composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system

The formation of aluminum matrix composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system was investigated. The thermal analysis results show that the reactions are spontaneous and exothermic. The Gibbs free energy of α-Al2O3 is the lowest among all the combustion products, followed by TiB2 and Al3Ti. It is noted that when the B2O3/TiO2 mole ratio is below 1, the reaction products are composed of particle-like α-Al2O3, TiB2 and rod-like Al3Ti. The α-Al2O3 crystallites, resulting from the reaction between A1 and TiO2 or B2O3, are segregated at the grain boundaries due to a lower wettability with the matrix. SEM micrographs show that rod-like Al3Ti phase distributes uniformly in the matrix. When the BEO3/TiO2 mole ratio is around 1, the Al3Ti phase almost disappears in the composites, and the distribution of α-Al2O3 particulates is improved evidently.     

赫哲族以鱼为生

提起吃鱼最多的民族，人们自然会想起日本。不错，日本人是全世界吃鱼量最多的人。然而在我国，也有一个民族的食鱼量能与他们匹敌，这个以鱼为生的民族就是赫哲族。随着社会的发展，赫哲族已经从事多种生产经营方式，但是他们仍旧保留着吃鱼的传统。[编者按]     

HRB335钢筋屈服现象不明显原因分析

用化学分析、力学性能测试、热处理、金相检验等手段探讨了直径为Ф10mm、牌号为HRB335的钢筋混凝土用热轧带肋钢筋屈服现象不明显的原因。     

Study on Preparation and Electrical Properties of Ba1.03 Ce0.8 Euo.2 O3-a Solid Electrolyte

Ba1.03 Ceo.8Euo.2O3-a solid electrolyte with nonstoichiometric composition was prepared by high temperature sol-id-state reaction. Phase composition, surface and fracture morphologies of the specimen were characterized by using XRD and SEM, respectively. Ionic conduction was researched by gas concentration cell, the performance of hydrogen-air fuel cell was measured in the temperature range of 600-1000℃, and compared them with those of BaCeo.8Euo.203-a and Bao.98Ceo.8Euo.2O3-a. The results indicate that Bat.03Ceo.8Euo.2O3-a is a single-phase perovskite-type orthorhombic system. It is a pure proton conductor in the temperature range of 600-1000℃ in hydrogen atmosphere, and its proton con-duction is superior to that of BaCeo.8 Euo.203-a and Bao.98Ceo.8Euo.203-a, It is a mixed conductor of oxide ion and electron hole in oxygen atmosphere. At 1000℃, the performance of the fuel cell in whieh Ba1.03Ceo.sEuo.2O3-a as electrolyteis higher than that of BaCeo.8Euo,2O33-a or Bao.98Ceo.sEuo.203-a.     

朝露A200GOLD高端2.0多媒体音箱

▲ 整体外观 对于朝露音箱,关注国内音频动向的读者肯定不会陌生的,长沙朝露电子有限公司开发的多媒体音响品牌,走的是高端路线,属于国内屈指可数的几家立志于生产高音质多媒体音箱厂商之一。 A200GOLD其外观只能说朴实无华,丝毫没有取巧之处,这也明显反应了设计者的风格,音质为主。事实上很多高端HI-FI音箱都是简单外形的,这类产品关键是在于其做工的精致和扎实。两只音箱并没有采取完全相同的设计,仍有主副之     

大中型同步电动机及笼型异步电动机直接启动有关问题的探讨

阐述了大中型同步电动机和笼型异步电动机直接启动的条件，以及各种启动条件的指标和计算方法．     

现浇预应力混凝土框架结构常用施工顺序对结构的适应性分析

针对现浇预应力混凝土框架结构三种常用施工顺序，分析了各种顺序的施工过程对结构的受力及今后使用产生的影响，阐明各施工顺序对结构的适应程度并给出了调整其适应能力的具体方法。     

使用ORACLE动态定义语句的通用查询统计实例

本文介绍一种使用ＯＲＡＣＬＥ动态语句进行统计查询的方法。利用使用描述符的动态ＳＱＬ语句编写了只要给出表名和某参数对应的字段名即可得到此变量的最大值、最小值、平均值、均方差等的函数，这对于大量的重复查询非常有用     

模糊纺织学刍议

提出了纺织技术领域的新分支－模糊纺织学。模糊纺织学的主要任务是利用模糊集理论研究纺织科学技术领域中存在的模糊性技术问题，并阐述了模糊编织学研究方法的基本思路。