一个嵌入式积相关电路的设计与实现

在嵌入式系统小型化和高速化的要求趋势下，实时图像处理系统中用通用DSP或专用集成电路来实现算法的计算和控制有一定的不足。文章讨论了一个以通用DSP和FPGA构成的实时图像处理系统的设计方法，最后对某一具体实时图象处理系统设计方案做了阐述。     

Myo-InositolTrisPyroPhosphate treatment leads to HIF-1α suppression and eradication of early hepatoma tumors in rats

Myo-inositol trispyrophosphate (ITPP), a synthetic allosteric effector of hemoglobin, increases the regulated oxygen-releasing capacity of red blood cells (RBCs), leading to suppression of hypoxia-inducible factor 1α (HIF-1α) and to down-regulation of hypoxia-inducible genes such as vascular endothelial growth factor (VEGF). As a consequence, tumor growth is markedly affected. The effect of weekly intravenous injection of ITPP on an orthotopic, syngenic rat hepatocellular carcinoma (HCC) model was compared to that for untreated animals and animals subjected to conventional Doxorubicin chemotherapy. The longitudinal examination of HCC was performed by microCT imaging, and the cellular and molecular changes were evaluated by histology and Western blotting analysis of HIF-1α, VEGF, and caspase-3 gene expression in the tumor and in the surrounding liver. Hematologic impact was evaluated by blood cell-count measurement and determination of P50 (oxygen partial pressure for a 50 % oxygen saturation of hemoglobin). The HCC evaluation by microCT revealed a high potency of ITPP for tumor growth inhibition, thus allowing long-term survival and even cure of almost all the treated animals. The P50 value of hemoglobin in RBCs underwent a shift of 30 % following ITPP injection. Under these conditions, HIF-1α activity was strongly decreased, VEGF expression was down-regulated, and apoptosis was induced in HCC and surrounding liver cells, as indicated by Caspase-3 expression. ITPP did not affect hematologic parameters during treatment. The observations of in vivo tumor eradication suggest a significant clinical potential for ITPP in cancer therapy.     

小麦淀粉制备麦芽三糖的研究

以小麦淀粉为原料 ,采用麦芽三糖淀粉酶AMT 1 .2L酶解制备麦芽三糖糖浆 .正交实验确定最佳糖化条件为淀粉乳浓度 2 5 % ,温度为 5 5℃ ,AMT 1 .2L加酶量 5u/g ,初始DE值 8,酶解 2 4h ,可以得到麦芽三糖比例在 70 %以上 ,转化率在 68%以上的糖浆 .用活性炭柱对糖化液进行分离提纯 .核磁共振图谱证实其结构为 3个葡萄糖残基以α 1 ,4键相连接 .     

Low response time context awareness through extensible parameter adaptation with ORCA

Ubiquitous computing applications or widespread robots interactions execute in unforeseen environments and need to adapt to changeful available services, user needs, and variations of the environment. Context-awareness ability addresses such a need, enabling, through adaptation rules, applications to react to the perceived dynamic variations. Responses to adaptation have to be quick enough to maximize the time during which the application is coherent with its environment. Adaptation rules, associating variations of the environment to application reactions, are usually established at design time. However, in unforeseen and partially anticipated environments, we claim that adaptation rules have to be dynamically extensible to match previously unexpected variations. Our approach enables rule composition and ensures a deterministic result. We propose to use parameter adaptation to quickly respond to environmental variations and dynamic compositional adaptation to provide extensibility to the parameter adaptation. To foster even lower response times, we internalize context-awareness processing and decision into the application.     

Properties of mixed chlorophyll a-glycolipid monolayers

Surface pressure, ellipsometric and surface potential-area isotherms have been measured to investigate the properties of chlorophyll a-digalactosyldiacyglycerol (Chl a-DGDG) and Chl a-sulfoquinovosyldiacylglycerol (SQDG) monolayers at the nitrogen-water interface. The surface pressure-area isotherms of Chla-DGDG exhibit a pronounced negative deviation with respect to ideality, whereas ellipsometric and surface potential isotherms of the mixed monolayers fall between those of the pure components. Hydrophilic interactions have been ruled out on the basis of the additivity law followed by the surface dipole moment of the mixed monolayers. The observed deviation exhibited by the π-A isotherms is interpreted in terms of an intermolecular cavity effect.     

基于地磁传感器的计转数引信可行性研究

主要提出了基于地磁计转数传感器的引信实验方案,研究了计转数引信装定原理,提出了装定转数的初步计算方法,分析了地磁计转数传感器,信号处理电路和检测电路的结构及工作原理,实验说明,该地磁计转数传感器在高速旋转平台上计数准确,且在各个方位条件下均可以可靠工作,可应用于弹丸上,实现弹丸的定距起爆。     

通用雷达并行信号处理系统中软件平台对并行性问题的研究和实现

所讨论的软件平台是在一个采用超级计算机结构的高速实时通用雷达信号处理系统样机上实现。该系统在充分考虑了现代雷达信号处理本身所具有的各种粒度并行性的特点的基础上 ,定义了一套专用并行高级语言。其主要特点包括 :定义矩阵作为系统基本数据结构 ;定义并行控制结构以实现一定的中粒度并行 ,数据流驱动机制以实现进程间粗粒度并行处理等。软件平台通过编译器和操作系统配合 ,解决了上述特殊的并行性问题 ,保证了用户能简单快速地完成编程工作。     

Influence of Deposition Positions on Fretting Behaviors of DLC Coating on Ti-6Al-4V

Abstract

The influence of diamond-like carbon (DLC) coating positions—coated flat, coated cylinder, and self-mated coated surface tribopairs—on the fretting behaviors of Ti-6Al-4V were investigated using a fretting wear test rig with a cylinder-on-flat contact. The results indicated that, for tests without coating (Ti-6Al-4V–Ti-6Al-4V contact), the friction (Q_max/P) was high (0.8–1.2), wear volumes were large (0.08–0.1?mm³) under a large displacement amplitude of ±40 µm and small (close to 0) under a small displacement amplitude of ±20 µm, and the wear debris was composed of Ti-6Al-4V flakes and oxidized particles. For tests with the DLC coating, under low load conditions, the DLC coating was not removed or was only partially removed, Q_max/P was low (≤0.2), and the wear volumes were small. Under high load conditions, the coating was entirely removed, Q_max/P was high (0.6–0.8), and the wear volumes were similar to those in tests without coating. The wear debris was composed of DLC particles, Ti-6Al-4V flakes, and oxidized particles. The DLC coating was damaged more severely when deposited on a flat surface than when deposited on a cylindrical surface. The DLC coating was damaged more severely when sliding against a DLC-coated countersurface than when sliding against the Ti-6Al-4V alloy.