共沉淀法制备Fe3O4超微粒过程中Fe^2＋离子氧化的影响

利用化学共沉淀方法制备Fe3O4超微粒样品，用透射电子显微镜（TEM）及X－ray衍射仪分别对样品的形貌，粒度及成份进行测试和分析，讨论了制备样品过程中Fe^2 离子的氧化对样品的影响。     

增压流化床（PFBC）烟气流量测量

增压流化床（ＰＦＢＣ）烟气流量测量蔡瑞洪，蒋守国，王双群，贾玉琴（东南大学热能所，南京２１００１８）为了估算烟气轮机的热效率，必须测量含尘烟气流量，ＰＦＢＣ含尘烟气经多级除尘后可使含尘浓度在２００ｍｓ／ｍ‘以下，尘粒粒径在１０ｕｒｎ以下，这种含尘烟气...     

含氟硫A矿的水化特性

研究了含氟硫Ａ矿的水化性能及Ｆ－、ＳＯ３和Ａｌ３＋固溶量变化对Ａ矿性能的影响。研究结果表明，含氟硫Ａ矿早期水化率、液相ｐＨ值和Ｃａ（ＯＨ）２过饱和度均较大，水化产物细化，强度提高，但凝结时间较长。Ａ矿固溶Ｆ－增多．凝结时间延长；固溶Ａｌ３＋可提高水化活性；固溶ＳＯ３可缩短终凝时间。实验结果还证明，石膏可显著加快Ａ矿的早期水化。     

空气—乙炔火焰原子吸收光谱法测定痕量铝

文研究了空气－乙炔火焰原子吸收光谱法测定铝的方法，利用铝对钙的干扰效应和微量进样技术间接测定了化学试剂中的痕量铝。实验表明，该法具有样品用量少，精密度好，简便实用的优点。。     

Ant System Based Optimization Algorithm and Its Applications in Identical Parallel Machine Scheduling

1 .ＩＮＴＲＯＤＵＣＴＩＯＮＩｄｅｎｔｉｃａｌｐａｒａｌｌｅｌｍａｃｈｉｎｅｓｃｈｅｄｕｌｉｎｇｐｒｏｂｌｅｍｆｏｒｍｉｎｉｍｉｚｉｎｇｔｈｅｍａｋｅｓｐａｎｈａｓｂｅｅｎｐｒｏｖｅｄｔｏｂｅａｎＮＰｐｒｏｂ ｌｅｍ[1,2 ] .Ｉｔｗａｓｔｒａｄｉｔｉｏｎａｌｌｙｓｏｌｖｅｄｂｙｏｐｅｒａｔｉｏｎａｌｍｅｔｈｏｄｓｓｕｃｈａｓｄｙｎａｍｉｃｐｒｏｇｒａｍｍｉｎｇ ,ｂｒａｎｃｈａｎｄｂｏｕｎｄｍｅｔｈｏｄ ,ａｎｄｉｎｔｅｇｅｒｐｒｏｇｒａｍｍｉｎｇ[3～ 7] .Ｔｈｅｓｅｍｅｔｈｏｄｓｃａｎ ｇｉｖｅａｎｏｐ…     

An improved quasi-newton method for unconstrained optimization

We present an improved method. If we assume that the objective function is twice continuously differentiable and uniformly convex, we discuss global and superlinear convergence of the improved quasi-Newton method. Fei Pusheng: born in Mar. 1941. Professor. Current research interest is in optimization theory and application Supported by the National Natural Science Foundation of China     

Constrained-MUSIC算法在高频地波舰载超视距雷达中的应用

在舰载超视距雷达检测时 ,由于载舰运动所造成的一阶海波谱展宽 ,遮蔽了舰船目标 ,造成目标检测的困难 ,采用空域超分辨处理 ,将目标与展宽的一阶海波谱分开是非常可行的。Constrained -MUSIC算法的分辨性能不受相干目标的影响 ,且在舰载超视距雷达中 ,由于展宽的一阶海杂波谱相应的空间方位是可计算出的 ,Con strained-MUSIC算法可以充分利用这一已知的方位信息 ,将与一阶海浪谱同频 ,但处于不同空间方位的船目标分辨出来 ,有效地实现了高频地波舰载超视距雷达检测下的空域超分辨处理 ,对在舰载雷达情形下有效地进行目标检测提供了一个良好的距离 -速度 -方位分辨后的三维检测背景平台     

水文地质求参实际问题探讨

针对野外水力试验常遇到的四种实际情况，根据非稳定井流理论和势函数叠加原理导出了它们各自的求参公式。对于单孔稳定抽水试验可用水位达到稳定之前的非稳定资料求参；而提水试验可通过把提水过程概化为连续的非稳定抽水过程，再利用其水位恢复资料求参；其它两种情况也是利用稳定之前的非稳定资料和水位资料求参的。     

氧瓶燃烧法分解,间接原子吸收法测定麦斯钠含量

本文研究了用原子吸收间接测定麦斯钠含量的方法。将麦斯钠置于充满纯氧的氧瓶中燃烧后,与过量的标准 Ba~(2+)反应,生成 BaSO_4沉淀,再用原子吸收法测定溶液中剩余的 Ba~(2+),间接求得麦斯钠的含量。方法简单方便,对5种麦斯钠样品进行了测试,回收率在98.45%—100.8%之间,取得了满意的结果。     

Thermochemical structures beneath Africa and the Pacific Ocean

Large low-velocity seismic anomalies have been detected in the Earth's lower mantle beneath Africa and the Pacific Ocean that are not easily explained by temperature variations alone. The African anomaly has been interpreted to be a northwest-southeast-trending structure with a sharp-edged linear, ridge-like morphology. The Pacific anomaly, on the other hand, appears to be more rounded in shape. Mantle models with heterogeneous composition have related these structures to dense thermochemical piles or superplumes. It has not been shown, however, that such models can lead to thermochemical structures that satisfy the geometrical constraints, as inferred from seismological observations. Here we present numerical models of thermochemical convection in a three-dimensional spherical geometry using plate velocities inferred for the past 119 million years. We show that Earth's subduction history can lead to thermochemical structures similar in shape to the observed large, lower-mantle velocity anomalies. We find that subduction history tends to focus dense material into a ridge-like pile beneath Africa and a relatively more-rounded pile under the Pacific Ocean, consistent with seismic observations.