一种新型雷达同步时序电路的失效保险设计方法

依据分割理论的定义,提出故障产生的条件.根据条件提出了雷达同步时序电路的"失效保险电路"设计的原理和步骤.该方法但也可应用在条件相似的其他电路的"失效保险"设计中.     

粉煤灰碳酸钠烧结工艺中影响锂浸出率因素的研究

以粉煤灰和碳酸钠为原料,采用正交试验探讨了烧结时影响粉煤灰中锂浸出率的因素。结果表明,在碳酸钠与粉煤灰以1∶1的比例在900℃焙烧2h的条件下,锂浸出率可以达到65%。     

环保型无氟化渣剂在攀钢炼钢中的应用

对攀钢集团西昌钢钒有限公司(以下简称西昌钢钒)铝脱氧钢精炼造渣机理进行了研究,根据理论分析精炼过程要求的“高碱度、高CaO活度、高熔化速度、低熔化温度”提出了一种新的无氟精炼化渣剂,主要成分为(/％:17 CaO,45 Al2O3,5 Na2O,4 MgO,5 SiO2).该化渣剂已在西昌钢钒应用,在LF工序加入量控制...     

用高温焙烧-盐酸浸出法从粉煤灰中浸出镓

研究了采用高温焙烧—盐酸浸出工艺从粉煤灰中浸出镓,考察了助剂(Na2 CO3,K2 CO3)与粉煤灰混合比例、焙烧温度、焙烧时间对粉煤灰高温焙烧的影响及浸出温度、盐酸浓度、固液质量体积比对镓浸出的影响.结果表明:Na2 CO3与K2 CO3(质量比3/1)的混合助剂与粉煤灰按质量比0.5/1混合,在950℃下焙烧2 h后,再用3 mol/L盐酸溶液在60℃、固液质量体积比1/10条件下浸出2 h,镓浸出率达93.43％,浸出效果较好.     

高碱度精炼渣造渣工艺技术研究与应用

根据攀钢钢水脱硫的要求,研究开发了高碱度精炼渣,经工业生产应用表明:采用高碱度精炼渣后,大幅度提高了钢水的脱硫率,降低了铸坯中T[O]含量,提高了钢水的洁净度,为攀钢低硫品种钢的开发创造了条件.     

一个高分子模拟计算网格的资源管理

主要介绍了一个高分子模拟计算网格平台资源管理的研究与实现.该计算网格的资源平台是集群式高性能计算机系统,接口采用了Globus3.2 GRAM,符合OGSA的标准.对于集群式高性能计算机系统的管理采用OpenPBS.由于OpenPBS不支持Globus3.2,因此扩展了OpenPBS的相关组件.同时还为计算任务提供了checkpoint机制,给用户的计算程序提供了容错功能.实践结果表明,本软件很好地实现了计算网格的资源管理.     

高压凝固Al2O3/Al-10Si复合材料组织热稳定性及力学性能研究

本文采用高压凝固的方法分别在3、4、5 GPa的压力下制备了Al₂O₃/Al-10Si复合材料,并分别在160 ℃保温2、4、6 h的条件下研究了高压凝固Al₂O₃/Al-10Si复合材料的组织热稳定性以及力学性能转变规律。研究表明：热处理导致高压凝固Al₂O₃/Al-10Si复合材料α相固溶的Si在热激活的作用下脱溶析出,聚集长大形成细小颗粒弥散分布于α相内,形成沉淀强化;160 ℃热处理后α相固溶的Si析出,过饱和程度下降,材料性能逐渐趋于稳定,在沉淀强化的共同作用下,Al₂O₃/Al-10Si复合材料抗压强度和压缩率较热处理前均有所上升。而160℃保温4 h的条件下,材料的综合力学性能最好。尤其在5 GPa压力下凝固的Al₂O₃/Al-10Si复合材料,抗压强度可达到716 MPa。     

A virtual square grid-based coverage algorithm of redundant node for wireless sensor network

A virtual square grid-based coverage algorithm (VSGCA) is proposed in this paper. Each sensor node divides its sensing range into virtual square grids, if all the grids are covered by neighbors, the target node is redundant node. Compared with some previous algorithms, VSGCA can guarantee the coverage and connectivity in the whole network and has a computational complexity of O(n×M), which is less than most of other algorithms. Simulation results show that VSGCA can achieve better performance with fewer active nodes and lower computational complexity.     

Vehicle mobility driven by traditional drivers versus connected drivers

The traditional vehicle mobility is restricted to the driver habits and the line-of-sight. The new-emerging connected vehicles enable information exchange with each other at vicinity, which will undoubtedly bring a greatly positive effect on the vehicle mobility pattern. In this paper, we propose to modeling and analyzing the vehicle mobility patterns respectively driven by traditional drivers and connected drivers. We perform the extensive simulations to explore the statistical differences between two mobility patterns and the underlying reasons through comparing to the real vehicle trace datasets. The results show that they behave quite diversely at the concerned aspects, e.g. degree distribution, clustering coefficient, topological shortest path, topological coefficient, and vehicle density, and also we find that the connected vehicles are well distributed and contribute a relieved traffic congestion situation.     

CAD矿图中储量图元的数据库化

CAD绘制的储量图运用广泛,但储量图元未统一,读图、计算都麻烦。运用ACCESS建库,在CAD下修改图件,通过VB对CAD图件进行读写,把CAD对象和数据库数据联系起来,实现了图件与数据库的统一。软件经实际使用,能够在对象和数据库间相互转化,规范了储量图,并简化了后续计算工作。