Co(-Fe)-B-Si-Nb块体非晶合金

利用团簇线方法和微合金化原理研究了Co基Co(-Fe)-B-Si-Nb多组元合金体系中块体非晶合金的形成。首先,确定Co-B-Si三元体系为基础体系,利用团簇线(体现在三元体系中为二元特殊团簇与第三组元的连线)在Co-B-Si体系中确定基础合金成分;然后添加少量的Nb对基础三元成分进行合金化以提高合金的玻璃形成能力。利用铜模吸铸法制备直径为3mm的合金棒,结果表明能够形成块体非晶的合金成分为(Co8B3-Si)100-xNbx(x=4～5at%),其中,Co8B3为密堆附半八面体的阿基米德反棱柱团簇结构。并且这些非晶成分可近似地用(团簇)1(胶粘原子)1模型表达,为(Co8B3)1M1(M=(Si,Nb)),即非晶成分由一个团簇连接一个胶粘原子组成,其中胶粘原子M为Si和Nb原子的组合。最后用Fe替代部分Co可进一步提高合金的玻璃形成能力,得到的Co-Fe-B-Si-Nb五元块体非晶合金具有很好的软磁性能,其饱和磁化强度(Ms)最大可达0.98T,矫顽力(Hc)低于6A/m。     

上海市住宅建筑夏季室内热湿环境实态调查与分析

为切实掌握目前上海市住宅建筑夏季室内热湿环境实态，于2003年8月在上海地区随机对100户5年内新建住宅进行了相关问卷调查和实测，并对其中典型的10户住宅进行了室内温湿度实测。问卷调查包括建筑概况、空调设备、生活方式、能源消费及舒适性等内容。调查结果发现：上海地区的空调普及率为98％，以分体壁挂式为主；空调使用高峰期为7、8月份，夜间使用率明显高于白天；室内舒适性较差，约90％的室内空气状态点不在ASHRAE舒适区内。     

PREVENTION OF THE INTERGRANULAR FRACTURE AT ELEVATED TEMPERATURES BY ADDITION OF PHOSPHORUS TO A HIGH PURITY Fe0 002% SALLOY

１．ＩｎｔｒｏｄｕｃｔｉｏｎＥｍｂｒｉｔｔｌｅｍｅｎｔｉｎｉｒｏｎａｎｄｓｔｅｅｌｓｉｓｃｌｏｓｅｌｙｒｅｌａｔｅｄｔｏｔｈｅｔｙｐｅ,ｔｈｅａｍｏｕｎｔ,ｔｈｅｅｘｉｓｔｉｎｇｓｔａｔｅ,ｅｓｐｅｃｉａｌｌｙｔｈｅｓｅｇｒｅｇａｔｉｏｎｏｆｉｍｐｕｒｉｔｉｅｓａｎｄａｌｌｏｙｉｎｇｅｌｅｍｅｎｔｓｔｏｂｏｕｎｄａｒｉｅｓ．Ｈｏｗｅｖｅｒ,ｔｈｅｒｏｌｅｏｆａｇｉｖｅｎｅｌｅｍｅｎｔｉｎｅｍｂｒｉｔｔｌｅｍｅｎｔｉｓｆｒｅｑｕｅｎｔｌｙａｆｆｅｃｔｅｄｂｙｔｈｅｅｘｉｓｔｅｎｃｅｏｆｏｔｈｅｒｅ…     

Development of novel rare earth doped fluoride and oxide scintillators for two-dimensional imaging

Two topics were focused.The first one was about the gamma-ray scintillator,Pr3+:Lu3Al5O12(LuAG) .The second one was about neutron scintillator,Ce3+:6LiCaAlF6 and Eu2+:6LiCaAlF6(6LiCAF) .Those scintillators have been developed very recently for modern imaging appli-cations in the medical and homeland security fields.In both cases,the rare earth ions are playing the crucial role as emission centers.Pr3+ in LuAG provided fast 5d→4f transition providing noticeably shorter decay time than that of Ce3+.Among several candidate hosts,LuAG showed the best performance.Bulk crystal growth,basic scintillation properties,two-dimensional gamma-ray imaging and positron emission mammography(PEM) application were demonstrated.Due to the international situation,the homeland security was compromized by illicit traffic of explosives,drugs,nuclear materials,etc.and the ways to its improvement became an important R&D topic.For this purpose the Ce and Eu doped LiCAF ap-peared competitive candidates.Especially,when substitution of 3He neutron detectors was considered,the discrimination ability of gamma-ray from alpha-ray was important.Bulk crystal growth,basic scintillation properties and two-dimensional neutron imaging were demonstrated.     

基于 ANN 状态识别系统的变压器故障检测方法

提出基于ＡＮＮ状态识别系统的变压器故障检测方法。该系统主要由ＡＮＮ变压器一次电压非线性估计器、比较器、计数器等构成。它通过比较一次电压实际值与估计值的大小,识别变压器内部是否发生故障。关于ＡＮＮ状态识别系统在检测变压器故障中的正确性及快速性,通过数字仿真得到验证。     

Recent collaborative researches between Japanese universities and steel industry on the iron ore agglomeration process

The properties of iron ores used in ironmaking process have been drastically changed in the past couple of decades.Especially,the change has become significant in the last few years because of the considerable increase in the world steel production.The property change of the iron ore is mainly caused by the depletion of the hard and high-grade lump hematite ores.It has led to the increasing use of ores containing a larger amount of goethite/limonite,i.e.,hydro-oxides of iron.Typically,the proportion of p...     

Evaluation study on properties of a macroporous silica-based CMPO extraction resin to be used forminor actinides separation from high level liquid waste

Basic properties of a silica-based octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphosphine oxide (CMPO) extraction resin (CMPO/SiO2-P) was investigated.Adsorption behavior for some rare earth elements (RE) which are constituents of high level liquid waste (HLLW) and the long-term stability of the extraction resin in nitric acid solution were examined.The CMPO extraction resin was significantly stable in 3 mol·L?1 HNO3 solution at 50oC.Furthermore,the RE(III) were efficiently separated from non-adsorptive fission product (FP) elements such as Sr(II) in a column experiment using a highly nitric acid solution.The separation behaviors of the elements are considered to result from the difference in their adsorption and elution selectivity based on the complex formation with CMPO.There was no strong dependency of RE(III) separation efficiency on feed solution flow rate.Only from the perspectives of the acid-resistant behavior of CMPO extraction resin and the elution kinetics for the metal ions with the extraction resin,the CMPO extraction resin can be used in the modified MAREC process for HLLW partitioning.     

HYDROGEN PULVERIZATION OF Nb_3Al AND NbCr_2 ALLOYS

１　ＩＮＴＲＯＤＵＣＴＩＯＮＨＩＰｉｎｇｏｒｈｏｔｐｒｅｓｓｉｎｇｏｆａｌｌｏｙｐｏｗｄｅｒｓｉｓａｃｏｎｖｅｎｉｅｎｔｐｒｏｃｅｓｓｔｏｐｒｏｄｕｃｅｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｃｏｍｐｏｎｅｎｔｓｃｏｎｓｉｓｔｉｎｇｏｆｒｅｆｒａｃｔｏｒｙｉｎｔｅｒｍｅｔａｌｌｉｃａｌｌｏｙｓｉｆａｌｌｏｙｐｏｗｄｅｒｓｗｉｔｈｈｉｇｈｑｕａｌｉｔｙａｒｅｐｒｏｖｉｄｅｄａｔａｌｏｗｃｏｓｔ．Ｈｙｄｒｏｇｅｎｐｕｌｖｅｒｉｚａｔｉｏｎ，ｗｈｉｃｈｉｓｋｎｏｗｎｔｏｂｅａｐｈｅｎｏｍｅｎｏｎｔｈａｔａｂｕ…     

高炉常用耐火材料导热系数的测定

采用激光脉冲法及使用DSC实测高炉用耐火材料的热扩散率及比热容,进而获得其导热系数.重点考察了温度及温度履历对耐火材料热扩散率及比热容的影响,得出二者与温度依存关系的数学模型,进而获得各种耐火材料的导热系数对温度的依存关系.测量结果表明:（1）除铝碳质耐火材料,其他耐火材料经一次高温后,测得的热扩散率值比第一次升温时的测得值增大,且温度特性随着温度变化呈现唯一的变化关系.而铝碳质耐火材料则相反,且随着升、降温过程的延续,热扩散率值逐渐减.（2）随温度的增加,比热容先较快增大后缓慢增加,温度履历对热容的测定基本没有影响.（3）根据测定结果,建立了导热系数λ（W/m·K）与温度T（K）之间的数学模型,经检验,该模型可有效地预测高炉常用耐火材料的导热系数.     

Dispersion behaviour of droplets in circular loop reactors

A circular loop reactor was built for application to a heterogeneous liquid-liquid reaction. In order to investigate the dispersion behaviour of droplets in the reactor, basic experiments were performed using a number of liquid-liquid dispersions. Droplets discharged form the impeller region were found to grow due to coalescence in the circulation region. Mean droplet diameter decreased exponentially with elapsing time. An expression correlating the steady-state mean droplet diameter with the operating conditions was derived. Moreover, the transition time required for the droplet diameter to reach the equilibrium value was determined and correlated with the operating conditions.