一种纹理图像分割的松弛算法

利用分层马尔可夫随机场模型表征纹理图像，根据最大后验概论分布准则提出一种确定型松弛分割算法。对纹理图像进行分割的实验表明，该算法与模拟退火算法相比，明显地减少了计算时间，其分割误差与模拟退火分割误差非常接近。     

济南城市发展预测研究

笔者通过对济南城市发展历史的研究,剖析城市发展的影响因素,如地形、交通等．选择SLEUTH模型,借助GIS、RS技术,对未来济南城市增长进行模拟,得到了济南未来2015年、2020年、2030年的城市中长期发展预测图,并通过与现实数据的比较验证了SLEUTH模型预测的精度．最后,针对济南未来发展存在的问题提出了浅见．     

Facile synthesis of CoFe2O4 nanoparticles anchored on graphene sheets for enhanced performance of lithium ion battery

Recently, metal oxides as high capacity anode materials had been investigated for lithium ion batteries.However, the fast capacity fading upon cycling leaded poor durability, which hindered their application as higher energy density of lithium ion battery. In this paper, a nanostructured nanocomposite with graphene supported CoFe_2O_4 nanoparticles(NPs) was prepared via simple hydrothermal reaction. The uniform CoFe_2O_4 NPs were anchored on graphene sheets, which brought a good performance on cyclability. Combined with the optimization of graphene content, the anode delivered a better capacity retention of 944 m A h g~(-1)over 50 cycles at current density of 100 m A g~(-1)and the good reversible capacity as 990 m A h g~(-1)when the rate returned from 5 A g~(-1)to 0.1 A g~(-1)after 60 cycles. The present work provided a desired structure for conversion anode materials or other electrode materials of large volume change.     

PASGAL语言中的GOTO语句

本文介绍了关于 GOTO 语句争论的历史背景,给出了在 PASCAL 中取消 GOTO语句的非形式化的证明。最后用一个职消 GOTO 语句的具体例子进行说明。     

BBK模型中非一阶效应和交换效应的理论研究

用BBK模型和修正后的BBK模型对低能、共面非对称几何条件下电子离化氢原子的三重微分散射截面进行了计算,并把结果与一级玻恩近似下的计算结果以及实验数据进行了比较,对修正后的BBK模型中非一阶效应和交换效应进行了分析和探讨.发现该模型中末态三体间的屏蔽包含了极强的非一阶效应信息.     

Synthesis of tungstophosphates of heteropoly compound and its catalytic property in oxidative desulfurization of diesel

Several kinds of Tungstophosphates of Heteropoly Compounds (TPHC) with different compositions and the same structure were synthesized using the method of solid-phase reaction to change the mol ratio of Na₄P₂O₇ · 10H₂O, WO₃ and Na₂WO₄ · 2H₂O. TPHC, as a catalyst, was used in oxidative desulfurization of diesel. The results show that TPHC has catalytic activity. With THPC existing, the highest desulfurization rate reaches 51.85%, 32.6% higher than that yield without TPHC. And the desulfurization rate increases with decreasing WO₃. FT-IR spectra of TPHC shows that the catalytic activity is related to the activity of end oxygen(O_d).The more active O_d is, the stronger the capability of obtaining or losing electron is. It means that TPHC has a good catalytic activity. FT-IR spectra of TPHC indicates that desulfurization rate is in linear correlation with ( is intensity of W-O_d vibration band, is intensity of P-O_a vibration band) and correlation coefficient reaches 0.965. Biography: BIN Xiaobei (1965–), female, Ph.D. candidate, Associate professor, research direction: environment science and environmental materials.     

高阶微分中值定理

将"微积分"教学中的微分中值定理推广到高阶导数,从而可由此直接推出Taylor公式.对于推广后的高阶微分中值定理,给出了一个简单明了的新证明.也考虑到了开区间和单侧导数等情形.     

大各向异性改性PbTiO3压电陶瓷研究及进展

简要综述了压电大各向异性改性ＰｂＴｉＯ３压投资亿的研究现状及最新进展,列出一些典型及性能,介绍了其主要应用,探讨了压电大各划性产生的机理。     

对修正的Gierer-Meinhardt模型的结构分析

利用分歧理论研究了一类反应扩散方程的结构,进行了线性稳定性分析－ 结果表明,其定态解呈现空间有序结构,含时解呈现时间周期有序结构,即时间耗散结构－     

热浪对成年和老年小鼠sICAM-1的影响

通过模拟一次高温热浪过程,研究热浪对成年小鼠和老年小鼠血液中可溶性细胞间黏附分子(sICAM-1)、体重、肛温的变化,以此探讨热浪过程对不同小鼠的影响。选取南京市2010年8月一次典型的热浪过程数据,利用气象环境模拟箱模拟其温度变化过程。将12只成年小鼠和12只老年小鼠分为对照组和热浪组,将热浪组放进模拟箱进行模拟,对照组正常温度饲养。试验期间,每日测量小鼠的体重、肛温,并于模拟结束后,检测两组sICAM-1的变化。结果两种小鼠中,热浪组sICAM-1表达均高于对照组。与对照组相比,热浪组老年小鼠sICAM-1显著升高(p0.01),热浪组成年小鼠sICAM-1有上升(p0.05),幅度小于老年小鼠。结论:老年小鼠在热浪刺激后,sICAM-1含量显著升高,可能增加患心脑血管疾病的危险性。