关于三门峡水库若干问题认识与思考

对三门峡水利枢纽工程四十年来的原建、增建、改建过程做了系统回顾和合理划分,对枢纽工程运用探索在有关重点问题进行了综合分析,认为综过增、改建过程和按“蓄清排浑”控制运用后,基本上实现了1969年“四省会议”原定目标,并就小浪底工程投运引起的条件变化,来水来沙变化和三门峡水利枢纽自身运用条件变化,对三门峡水库今后提出了几点参考意见。     

Crack growth predictions in a complex helicopter component under spectrum loading

Fatigue crack growth predictions have been made on a helicopter round‐robin crack configuration. The crack configuration was a small corner defect at the edge of a large central hole in a flanged plate made of 7010 aluminium alloy and the component was subjected to a simulated helicopter spectrum loading. The crack growth rate data and the stress‐intensity factor (K) solution for the crack configuration were provided in the round‐robin. The FASTRAN life‐prediction code was used to predict fatigue crack growth under various load histories on the aluminium alloy, such as Rotorix and Asterix, on both compact tension C(T) specimens and the complex crack configuration. A BEASY three‐dimensional stress‐intensity factor solution for the round‐robin problem was also provided for this paper and is compared with the original K solution. Comparisons are made between measured and predicted fatigue crack growth lives for both crack configurations. The predicted lives for the C(T) specimens were 15–30% longer than the measured lives; and crack growth in the round‐robin configuration agreed very well in the early stages of crack growth, but the life was 30% short of the test results at the final crack length.     

空间命名实体的识别

采用地理编码和汉语切分词相结合的方法对空间命名实体进行在线识别。通过全文粗扫描获取相关的地理编码来锁定文中涉及的空间范围,然后按照一定的策略在确定的空间范围内进行单句识别,从而显著地减少了词典的加载量,较好地解决了因命名实体词典数量庞大而导致的低效率问题。实验表明,该方法能有效降低内存的消耗量和识别时间,提高识别精度,基本满足空间命名实体在线识别和位置信息服务的要求。     

厚板小孔冲裁力学分析

分析厚板小孔冲裁机理,从力学角度建立了冲裁力计算模型,对现行冲裁力计算公式进行了补充。     

基于Pro／Engineer的活塞模具CAD智能系统的开发

针对当前我国CAD应用的日益普通和推广,而二次开发严重滞后的现状,结合笔者当前正在开发的活塞模具CAD智能系统,较详细地阐述了利用VisualC 6．0的集成开发环境（IDE）和Pro/Toolkit开发模块进行Pro/Engineer二次开发的具体过程,对创建于基Pro/Engineer的实用CAD系统进行了积极有效探索。     

重介质旋流器的推广及新技术的应用

介绍了重介质旋流器选煤技术的发展现状,唐山研究院根据市场需求,利用计算流体力学技术结合重介质旋流器分选理论,研制出多供介无压给料三产品重介质旋流器、非金属矿用旋流器和难选煤专用的新型重介质旋流器,介绍了它们各自的特点.     

某水电站厂房下卧软弱夹层基础岩体质量及灌浆效果评价

某水电站厂房基础在帷幕灌浆时出现钻孔涌水并伴有黄色泥浆、浆液大量流失现象。通过深挖厂房基础集水井初步探明,下卧1m多厚性状较差软弱夹层,从而迫使施工停止。为了快速查明软弱夹层的分布范围、性状特征及对基础稳定性影响,在厂房区利用12个灌浆钻孔进行声波测试,并取岩芯进行单轴抗压强度和波速测试,评价了基础质量,揭示了软弱夹层的厚度及其分布。通过Ⅰ序灌浆和Ⅱ序灌浆前后的波速对比测试,评价了基础的灌浆效果,为基础质量验收提供了重要依据。     

基于VC的自动绘制网络拓扑技术

简要介绍了自动发现网络拓扑、数据库设计的方法,通过ADO与数据库的连接及内存泄漏的问题。重点分析了运用VC来自动绘制拓扑的实现方法和详细算法,主要包括设备和链路的自动显示和子网拓扑图的显示;分析了在自动绘出的拓扑图的基础上手工调整拓扑图的实现方法及在拓扑图中随意查看设备和链路相关信息的功能实现算法技巧。     

Growth kinetics in levitated and quenched Nd-Fe-B alloys

We investigated the growth kinetics and the effect of quenching conditions on rapid solidification of undercooled Nd-Fe-B melts with compositions near the Nd-₂-Fe₁₄-B (2-14-1) phase. We prepared melt drops of various undercooling levels (up to 300 K below the liquidus temperature) were prepared by the electromagnetic levitation method and subsequently quenched them onto chill substrates. We measured the solidification kinetics of the undercooled melts in situ using a high-resolution Si photodiode. In accordance with the nucleation theory, the properitectic γ-Fe phase nucleates at first during the undercooling process. There were two different solidification routes, with the observed route depending on the undercooling level of the levitated melt prior to quenching. The peritectic reaction is favored in melts with high undercooling levels prior to quenching. Low previous undercooling levels lead to primary solidification of the 2-14-1 phase on quenching. The thickness of the homogeneous 2-14-1 phase zone, grown directly at the substrate side, depends strongly on the undercooling level prior to solidification. We estimated the growth velocity of the 2-14-1 phase from temperature-time-characteristics to be of the order of 1 mm/s. These investigations give rise to improved understanding about the high sensitivity of the microstructure of Nd-Fe-B alloys on different rapid solidification procedures     

生长激素（PST）脂质体的制备初探

采用冰冻熔融法制备脂质体,包封率进行测定可达29％。同时对影响包封率的因素进行了分析,得出卵磷脂：胆固醇为5：2,超声时间为3min,中性环境,冰冻24h或冷藏3d,4℃左右贮存,其稳定性良好,包封率几乎无变化。