Banach空间上变分不等式的一个超梯度方法

把王宜举等人[Modified extragradient—type method for variational inequali—ties and verification of the existence of solutions,J.Optim.Theory Appl.,2003,119:167-183]在欧氏空间上求解变分不等式的一个超梯度型方法推广到Banach空间.变分不等式中的算子不要求是一致连续的,其主要优点在于不管变分不等式是否有解,算法都是可执行的.此外,变分不等式的可解性可以通过算法产生的序列的性态来刻画.在适当的条件下,算法产生的序列强收敛于变分不等式的一个解,这是Bregman距离意义下离初始点最近的解.本文的主要结果推广和改善了近来文献中的相应结果.     

Influences of different structures on the characteristics of H_2O-based and O_3-based La_xAl_yO films deposited by atomic layer deposition

H_2O-based and O_3-based La_xAl_yO nanolaminate films were deposited on Si substrates by atomic layer deposition(ALD). Structures and performances of the films were changed by different barrier layers. The effects of different structures on the electrical characteristics and physical properties of the La_xAl_yO films were studied. Chemical bonds in the La_xAl_yO films grown with different structures and different oxidants were also investigated with x-ray photoelectron spectroscopy(XPS). The preliminary testing results indicate that the La_xAl_yO films with different structures and different oxidants show different characteristics, including dielectric constant, equivalent oxide thickness(EOT), electrical properties, and stability.     

亚微米和纳米氧化锌对蝌蚪生长发育的影响

采用短期水体暴露方式,初步探讨亚微米和纳米氧化锌对蝌蚪生长发育的影响。150只发育至相同时期的幼年蝌蚪,随机分为3组:对照组、200nm氧化锌暴露组和30nm氧化锌暴露组。分别添加5mg 200nm和30nm氧化锌至1L水中,进行暴露实验。本研究通过测定蝌蚪的重量、观察蝌蚪尾部组织形态及测定蝌蚪对Zn的吸附量,探讨亚微米和纳米氧化锌对蝌蚪胚后发育的影响。结果发现,对照组与暴露组在蝌蚪重量方面没有显著性差异(P>0.05),但两氧化锌暴露组之间差异显著(P<0.05);H&E染色观察蝌蚪尾部组织形态发现,ZnO水体暴露可引起蝌蚪一定程度上的组织病变。此外,200和30nm氧化锌暴露组中蝌蚪对Zn的吸附量显著高于对照组(P<0.05),但两氧化锌暴露组之间差异不显著(P>0.05)。更多还原     

Superior material qualities and transport properties of InGaN channel heterostructure grown by pulsed metal organic chemical vapor deposition

Pulsed metal organic chemical vapor deposition is introduced into the growth of In Ga N channel heterostructure for improving material qualities and transport properties. High-resolution transmission electron microscopy imaging shows the phase separation free In Ga N channel with smooth and abrupt interface. A very high two-dimensional electron gas density of approximately 1.85 × 1013cm-2is obtained due to the superior carrier confinement. In addition, the Hall mobility reaches 967 cm2/V·s, owing to the suppression of interface roughness scattering. Furthermore, temperature-dependent Hall measurement results show that In Ga N channel heterostructure possesses a steady two-dimensional electron gas density over the tested temperature range, and has superior transport properties at elevated temperatures compared with the traditional Ga N channel heterostructure. The gratifying results imply that In Ga N channel heterostructure grown by pulsed metal organic chemical vapor deposition is a promising candidate for microwave power devices.     

基于高效阴离子色谱-脉冲安培法优化阿拉伯木聚精单精组成分析

以大粒车前子来源阿拉伯木聚糖为研究对象,采用完全酸水解结合高效阴离子色谱-脉冲安培法测定单糖组成,系统优化酸的种类和浓度、水解温度和时间、水解后样品放置时间等水解条件.结果表明,将车前子多糖置于2 mol/L H2 SO4、120℃常压油浴条件下水解2 h时,效果较好,但水解后稀释液放置时间不宜超过6 h.大粒车前子多糖主要由阿拉伯糖(8.89%)和木糖(41.52%)组成,同时检测出半乳糖醛酸(0.73%)、葡萄糖醛酸(3.44%)和微量的半乳糖、葡萄糖,结果重现性良好.利用上述最优条件水解黍子壳、燕麦麸皮和青稞来源阿拉伯木聚糖并分析单糖组成,均获得较好结果.本研究为分析各种来源阿拉伯木聚糖的单糖组成提供了参考.     

DIFFERENTIAL INVERSE VARIATIONAL INEQUALITIES IN FINITE DIMENSIONAL SPACES

In this article,a new differential inverse variational inequality is introduced and studied in finite dimensional Euclidean spaces.Some results concerned with the linear growth of the solution set for the differential inverse variational inequalities are obtained under different conditions.Some existence theorems of Caratheodory weak solutions for the differential inverse variational inequality are also established under suitable conditions.An application to the time-dependent spatial price equilibrium control problem is also given.