熔模离心法制备高纯氧化铝基质膜管

无机膜以其耐高温、耐腐蚀、性能稳定等优点，在化工、食品、医药、环保等领域的应用日益广泛．本文提出了高铝基质膜管的一种新的制备方法熔模离心法．这种方法脱模容易，可以一次获得孔径由大到小逐渐过渡的梯度管．采用这种方法我们已在实验室制得了顶层孔径为０．２μｍ，通量为１５８ｍ３·ｍ－２·ｈ－１，显气孔率为５８％的梯度管，可以直接作为微滤膜管，也可作为支撑体管，进一步修饰后用于超滤、催化、反应，成为一种新型的催化剂材料和膜反应器     

过渡区和图象分割

过渡区是实际图象中介于目标和背景之间的特殊区域，本文介绍过渡区的特点和确定过渡区的方法。本文还提出了一种自动基于过渡区的新分割算法，并把该算法与常见的阈值选取算法进行了比较，分析和实验结果表明新算法运算简单并有较强的抗干扰能力。     

关于ICCG与有限元结合时计算特性的讨论

本文给出了ICCG的复数形式,并将其应用于电磁场散问题的数值计算中.讨论了不同性态的矩阵方程用ICCG求解的特点.并与其它算法进行了对比.同时文中还讨论了有限元网格优化及预选参数Ψ对ICCG收敛速度的影响.结果表明这种算法对解大型问题.尤其是对大型稀疏阵非常有效.     

倾斜功能材料的开发动向

介绍了倾斜功能材料的概念；倾斜功能材料的合成工艺；倾斜功能材料的应用例及展望。     

三维三相黑油模型的MILU－CG方法及数值结果比较

本文以参考文献［１］中ＳＰＥ考题设计的三维三相黑油模型的地层参数、ＰＶＴ表及生产方式为模拟的依据，利用ＬＳＯＲ、ＳＳＯＲ－ＣＧ、ＩＬＵ－ＣＧ及ＭＩＬＵ－ＣＧ方法进行模拟，结果表明ＭＩＬＵ－ＣＧ方法较ＬＳＯＲ快１０倍，较ＩＬＵ－ＣＧ也快约１倍。随着问题规模的增加，ＭＩＬＵ－ＣＧ显得更有效，因此是油藏数值模拟中值得重视和推广的好算法。     

铁掺杂Y－124高温超导相的电场梯度研究

将点电荷模型和有效价键理论结合起来，发展成点电荷－有效键价模型理论。并利用这种理论模型研究了在高Ｔｃ氧化物超导体Ｙ—１２４结构中被铁杂质原子所占据的有不同局域环境的铜晶位上的电场梯度和所对应的四极劈裂．利用这种方法建立了Ｆｅ（３＋）离子在亚晶格尺度上的位移与其电场梯度和周围各离子有效化合价的关系．根据实验中的四极劈裂观察值，从理论计算结果中得到对应于Ｆｅ－Ｏ五配位的Ｆｅ（Ｂ’）离子将偏离ＣｕＯ２面０．０１９５ｎｍ，而具有Ｆｅ－Ｏ六配位的Ｆｅ（Ｂ）离子将偏离０．０３９５ｎｍ．此两晶位上的电场梯度分别沿着＋Ｚ和－Ｚ方向。这种点电荷－有效键价模型对高Ｔｃ氧化物超导体实验中晶位的指认和Ｆｅ（３＋）的位移分析有重要的意义。     

直通道磁元件磁场测量

为使重离子束从注入器（ＳＦＣ）不经主加速器（ＳＳＣ）直接传输到实验终端。最近在兰州重离子研究装置（ＨＩＲＦＬ）上新建了直通管道系统。在该系统中有３台偏转磁铁和３台四极透镜。本文叙述了它们的测磁内容和方法，给出了激磁曲线、径向和轴向场分布、磁场梯度、等效长度等结果。结果表明：全部符合原设计要求，并有一定的余量。     

Application of SiC-Si functionally gradient material to thermoelectric energy conversion device

Because of its high–temperature chemical stability, SiC ceramic is a promising material for high-temperature device applications such as thermoelectric energy converters. However, the electrical conductivity of SiC ceramic is too low for it to be used as a thermoelectric energy converter at the cold junction. Therefore, we propose a SiC-Si functionally gradient material (FGM) in order to improve the electrical conductivity of the SiC ceramic at the cold junction. An SiC rod was fired in a temperature gradient furnace. One end of the SiC rod was maintained at 2473 K and the other end was maintained at 1973 K for 30 min. After firing, the porous SiC edge fired at 1973 K was dipped into molten Si in order to infiltrate molten Si into the porous SiC. The microstructure of the FGM is classified into three regions: the SiC-Si composite material; the porous SiC ceramic; and the densified SiC ceramic. The electrical conductivity, the Seebeck coefficient and the thermal conductivity for each region of SiC-Si FGM was measured at 300 K; a figure of merit was calculated. The figure of merit of the SiC-Si FGM at the cold junction, at room temperature, was 10⁸ times higher than that of a nongradient SiC ceramic.     

梯度相关法测量两相流流量的精度与离散性研究

借助一种新的传感器布置与信号处理方法,能够测量真正的平均流速与流量。通过对气一固两相流体的实验研究,证明了梯度相关理论与实验相符。针对长时间连续测量中出现的互协方差梯度波动问题,对光学传感器的数学模型与互协方差梯度计算方法进行了修正,提高了测量精度。     

Obtaining sample path derivatives by source code instrumentation

This paper describes a process for determining the value of the gradient of the real outputs of a program with respect to its real parameters. CalledGradient Instrumentation, it is a mechanical process of insertion into the program's source code. The resulting program yields the gradient without the re-execution of the program. The sample path derivatives of many discrete event dynamical system simulations can be found using Gradient Instrumentation, by treating them as deterministic programs. The technique can also be applied to continuous simulations. The subject of a patent, Gradient Instrumentation yields derivatives of any order.