医学图像体数据多平(曲)面重建

在用不同方法实现了医学图像体数据平面重建功能的基础上,对三个成像平面中鼠标确定的控制点采用B-Spline的方法拟合曲线,并根据任意设置的采样步长,以平面的方式显示曲线确定的面对应的医学图像体数据,从而实现了医学图像体数据的高精度曲面重建,成功的避免了用线段近似曲线所带来的误差.通过实验对比,择优选取帧速率较高的方法,实现了基于普通PC平台的MPR软件组件.     

Fabrication and thermal stability of Ni-P coated diamond powder using electroless plating

Ni-P coated diamond powder was fabricated successfully by using electroless plating. Effects of active solutions, plating time, reaction temperature, and the components of the plating bath on the Ni-P coating were investigated systematically. Moreover, a study on the thermal stability of Ni-P coated diamond under various atmospheres was performed. The results indicate that Pd atoms absorbed on the diamond surface as active sites can consequently enhance the deposition rate of Ni effectively. The optimized plating bath and reaction conditions improve both the plating speed and the coverage rate of Ni-P electroless plating on the diamond surface. Compared to the diamond substrate, the diamond coated with Ni-P films exhibits very high thermal stability and can be processed up to 900℃ in air and 1300℃ in protective atmosphere such as H₂.     

Microstructure characterization of a pressureless infiltrating oxidized SiCp preform by Al-8Mg

The microstructure of a pressureless infiltrating 55vol% oxidized SiC preform by Al-8Mg alloy was characterized by transmission electron microscopy (TEM), high resolution TEM (HRTEM), field emission scanning electron microscopy (FE-SEM), and X-ray diffraction. The TEM image of the interface between Al and SiC shows that the surface of SiC is covered by a rough nanocrystal layer of MgAl₂O₄, Al₂O₃, and Si, produced by the interfacial reaction of Al, Mg, and SiO₂ on the surface of SiC. The Al-SiC interface is also examined by HRTEM to be better understood how MgAl₂O₄ and Al₂O₃ are produced. Dendritic Al₂O₃ crystals are embedded in the pores of the composite generated from the mutual bonding of SiO₂ on the surface of SiC. Columnar AlN crystals of about 250 nm in length are bunched vertically on the SiC particle surface.     

Preparation, crystallization, and wetting of ZnO-Al2O3-B2O3-SiO2 glass-ceramics for sealing to Kovar

A novel type of ZnO-Al₂O₃-B₂O₃-SiO₂ glass-ceramics sealing to Kovar in electronic packaging was developed, whose thermal expansion coefficient and electrical resistance are 5.2×10-6/℃ and over 1×1013 Ω·cm, respectively. The major crystalline phases in the glass-ceramic seals were ZnAl₂O₄, ZnB₂O₄, and NaSiAl₂O₄. The dielectric resistance of the glass-ceramic could be remarkably enhanced through the control of alkali metal ions into crystal lattices. It was found that crystallization happened first on the surface of the sample, leaving the amorphous phase in the inner, which made the glass suitable for sealing. The glass-ceramic showed better wetting on the Kovar surface, and sealing atmosphere and temperature had great effect on the wetting angle. Strong interracial bonding was obtained, which was mainly attributed to the interracial reaction between SiO₂ and FeO or Fe₃O₄.     

基于LPFT-MUSIC的窄带多项式相位信号波达方向估计方法

基于局部多项式傅里叶变换（local polynomial Fourier transform, LPFT）,提出了一种新颖有效的窄带多项式相位信号波达方向估计算法。虽然LPFT比Wigner-Ville分布运算复杂,但该变换具有更优的瞬时频率估计能力、较低的交叉项影响,及处理多项式相位信号的能力。理论分析表明,本文方法的信噪比提升能力优于基于Wigner-Ville分布的传统时频子空间多重信号分类（multiple signal classification, MUSIC）法。仿真实验验证该方法的性能。     

基于串扰的无线传感器网络可用带宽估计算法

可用带宽是无线传感器网络中路由选择、负载均衡、多sink布置、优先级传输等策略的重要参考.文中提出一种利用串扰来估计采用了S-MAC协议的无线传感器网络可用带宽的方法.传感器节点在使用串扰避免机制后,将收集到邻节点的RTS/CTS/DATA/ACK分组中的网络分配矢量以表的形式记录在自己的缓存中,经过计算得到节点的可用带宽.仿真结果表明,该方法能够较为准确地预测S-MAC中节点周围的负载情况和竞争程度.     

一种新型聚合物锂离子电池的制备和性能研究

采用一种新颖简单的方式处理负极片,并在其表面形成一层厚度均匀、孔隙丰富的聚合物膜。以此聚合物膜作为锂离子电池的隔膜组装聚合物锂离子电池并测试电池的电化学性能。性能测试显示聚合物锂离子电池性能优越,表明该方法可用于聚合物锂离子电池的工业化生产。     

核磁共振成像在射孔完井中的应用

在实验室条件下对贝雷砂岩进行射孔试验,并分别对射孔后的靶体进行酸化、压裂工艺处理,利用核磁共振和工业XCT技术分别对未射孔的靶体、射孔后的靶体、射孔后酸化的靶体、射孔后压裂的靶体进行测试。定量分析了射孔对砂岩靶体的损害及酸化、压裂对射孔损害的解除作用,并进行现场试验验证。对合理有效地规划油田采油工艺具有一定的参考价值和指导意义。     

固相化葡萄糖氧化酶柱的研制

本文报导将葡萄糖氧化酶固定在改性硅胶上的最适宜条件及用此固相化酶测定葡萄糖的条件。同时拟定了模拟酶代替辣根过氧化物酶进行催化显色的反应条件。用所建立的分光光度法在固相化酶柱上测定了血清中葡萄糖的含量。与试剂盒测定结果对照，相关性较好，回收率为９５％－１０３％。酶柱历时两年多，重复测试５００次仍未失活。     

在O2和NO存在下Ir催化氧化黑烟的研究

模拟柴油机尾气中O2和NO的氛围，研究了以Ir为基础的催化剂对黑烟的催化氧化。与Pt／SiO2比较，Ir／SiO2对黑烟氧化有其相似的催化活性，但有更高的CO选择性。通过测定Ir含量对催化活性和CO选择性的影响，发现在研究的范围内（0到5％），随着Ir含量的增加，催化活性增加，CO选择性降低。此外，测定了氧化物载体对催化活性及CO选择性的影响，得到了催化活性顺序为Ir／ZSM-5〉Ir／SiO2〉Ir／γ-Al2O3，CO选择性顺序为Ir／ZSM-5〈Ir／γ-A12O3〈Ir／SiO2。