Removing coarse sediment by sorting of reservoirs

Reservoir sedimentation is an unsolved problem.In this paper,based on measured data,theoretical analysis and numerical computations,we prove that a proportion of the sediment coarser than 0.1 mm(CS) is sorted and deposited in specific reaches in the upper backwaters or in run-of-river reservoirs.The ratio of CS is usually small but it impacts the slope of deposition delta greatly and raises the backwater in later stages for a river shaped reservoir(RSR).Based on these facts,we propose to remove such CS from...     

Multi-level multi-area hybrid automatic voltage control system and its trial operation in Northeast China Grid

In order to coordinate automatic voltage control(AVC)systems of a large interconnected system,a multi-level multi-area hybrid automatic voltage control(MLMA-HAVC)system was constructed.This system began its trial operation in the Northeast China Grid in January 2010,and for the first time in China and abroad it realized automatic close-loop control of multi-area and multi-level interconnected power grid and multi-objective self-approaching optimization in aspects of security,high quality and economic operat...     

Model updating based on incomplete modal data

The objective of model updating is to improve the accuracy of a dynamic model based on the correlation between the measured data and the analytical (finite element) model. In this paper, we intend to update the mass and stiffness matrices of an analytical model when only modal frequencies or spatially incomplete modal data are available. While the proposed method is systematic in nature, it also preserves the initial configuration of the analytical model, and physical equality and/or inequality constraints ...     

La在KCl-NaCl和LaCl_3-KCl-NaCl熔体中的溶解行为SCIEI

本文利用透明槽技术、电化学循环V-A法及量子化学EHMO三种方法,研究了La在KCl-NaCl(1:1mol)及LaCl_3-KCl-NaCl熔体中的溶解行为。初步认为:溶解在KCl-NaCl熔体中的La是以中性金属状态存在。在LaCl_3-KCl-NaCl熔体中,溶解的La与La^(3+)作用生成低价La^(2+)离子,La^(2+)又与周围的La^(3+)作用形成原子簇离子La_m^(n+)赋存于熔体之中。     

Ti对Ml(NiCoMnTi)_5合金相结构和充放电循环性能的影响

研究了微量 Ｔｉ在 Ｍｌ（ＮｉＣｏＭｎＴｉ）５合金中的作用．结果表明,在铸态条件下,Ｔｉ几乎全部以 ＴｉＮｉ３第二相的形式在晶界析出,退火处理后 ＴｉＮｉ３相消失,但 ＳＥＭ和 ＥＤＳ表明 Ｔｉ取代了 ＡＢ５型化合物中 Ａ侧的稀土 Ｍｌ;而不是 Ｂ侧的 Ｎｉ．Ｔｉ在 Ａ侧的取代量以 ５％为宜．此时合金在铸态和退火态的放电容量都在 ３１０ ｍＡ·ｈ／ｇ以上．进一步提高取代量虽然会改善循环稳定性,但大大降低了放电容量．     

电化学方法研究纯镁在薄液膜下的腐蚀行为 Ⅰ-O2对纯镁在薄液膜下腐蚀行为的影响

用电化学法研究了纯镁在未除氧和除氧的下不同厚度薄液膜下的腐蚀行为.结果表明:薄液膜下纯镁腐蚀的阴极过程受氢还原控制;液膜厚度的减小使其阴极过程和阳极过程都受到抑制,对阳极过程影响很大.氧气的存在对阳极过程的影响很大,并使得纯镁表面易于生成表面膜,表面膜更加连续和致密.     

注塑成形模拟技术在模具设计中的应用

在一模多腔的注塑模具设计中,合理地设计分流道和浇口的尺寸,保证塑料熔体以相同的成形压力和温度,在同一时间充满型腔一直是设计的重点和难点。以非自然平衡浇注系统为重点,阐述了浇道和冷却系统的优化算法以及如何利用华塑三维模拟成形分析软件进行流动模拟和工艺优化。     

基于粗糙集神经网络的综合传动故障诊断

针对综合传动装置在道路试验过程中大量采集的油样,建立了油液分析数据库。采用粗糙集理论的信息约简,根据粗糙集理论能处理不精确、不完整、不一致的数据的特点,结合神经网络强大的线性逼近和模式识别的功能,建立了粗糙集神经网络模型。将该模型应用于综合传动装置的模式识别,取得了满意的诊断结果。研究结果为在不完整征兆信息下的机械故障诊断提供了新的方法和思路。     

ELASTOPLASTIC CONTACT BEHAVIOR AND SHAPE OPTIMIZATION OF DRILLPIPE THREAD

ＮＯＴＡＴＩＯＮＳＤ———ＥｌａｓｔｉｃｉｔｙｍａｔｒｉｘＱ———Ｐｌａｓｔｉｃｐｏｔｅｎｔｉａｌｙ———ＹｉｅｌｄｆｕｎｃｔｉｏｎＫｔ———ＴａｎｇｅｎｔｓｔｉｆｆｎｅｓｓｍａｔｒｉｘＫ0 ———ＩｎｉｔｉａｌｓｔｉｆｆｎｅｓｓｍａｔｒｉｘΨ(ｕ)———ＮｏｎｌｉｎｅａｒｄｉｓｃｒｅｔｅｅｑｕａｔｉｏｎｏｐｅｒａｔｏｒＤｐ———ＰｌａｓｔｉｃｉｔｙｍａｔｒｉｘＤｅｐ———ＥｌａｓｔｏｐｌａｓｔｉｃｍａｔｒｉｘＡ———Ｍａｔｅｒｉａｌｐａｒａｍｅｔｅｒｋ———Ｈａｒｄｅｎｉｎｇｐａｒａｍｅｔｅｒλ—…     

液相流动对柱晶一次间距的影响

利用带有对流驱动系统的定向凝固装置,研究了液相稳定流动时透明合金SCN-2wt-％Ace定向凝固的动态过程.结果表明:流动显著改变定向凝固柱状晶的一次间距枝晶的间距增大,主要是流动与枝端浓度场耦合作用的结果;胞晶的间距变小,主要是侧向分枝转向生长的结果