一类时变非线性系统的一致有界性的注记

主要研究带干扰的广义齐次系统的一致有界和一致最终有界性 ,证明了当干扰项满足一致有界及Lp 可积时系统的一致有界性及一致最终有界性 ,本质推广了最近相关文献中的有关系统一致有界性的结果 .     

单模加光子双模SU(2)相干态的非线性高阶差压缩

本文研究了单模加光子双模SU(2)相干态|M,ζ;m〉=Ama m|M,ζ〉的非线性高阶差压缩(即N次方X压缩)效应.数值计算结果表明:对于单模加光子双模SU(2)相干态,光场存在着非线性高阶差压缩??—N(=1,2,3,4,…)次方X压缩效应,且随着光场总光子数M的增加,N次方X压缩效应增强,但增大场模光子增加数m或增大N次方X压缩的压缩阶数N,N次方X压缩效应减弱.     

Estimation of the rational water area for controlling wind erosion in the dried-up basin of the Ebinur Lake and its effect detection

The Ebinur Lake region was described as a ＂Green Labyrinth＂ in ＂Xinjiang Map Records： Records of Rivers＂ published in 1910, however, the ecology and environment in the region have been seriously degenerated due to the impacts of human activities during the recent 40 years. A dried-up lake basin with an area of 107.4 km^2 forms in its northwestern part, is covered by unconsolidated silt deposit without vegetation, and has become one of the main dust sources of dust weathers in north Xinjiang, and the dust with an annual amount of 4.8×10^6 t is blown out of the region by strong winds from the Alataw mountain-gap where there are 164 days occurring strong winds in a year. The rational water area and inflow of the Ebinur Lake for improving the ecology in the lake region and effectively controlling wind erosion in the dried-up lake basin are estimated using the water balance equation after analyzing the current ecological problems and the relationship between the granular composition of deposit in the dried-up lake basin and the dust weathers, and the ecological effects in recent years are monitored. It is considered that the water area of the Ebinur Lake for improving the ecology in the lake region and effectively controlling wind erosion in the dried-up lake basin should be 800 km^2at least, and the annual volume of surface runoff and groundwater recharging the lake should be over 7.92×10^8 m^3.     

纤维素系高吸水性树脂的制备工艺及其发展方向

介绍了纤维素接枝丙烯酸、丙烯酰胺、丙烯腈不同单体制备高吸性树脂的工艺,论述了改善其耐盐性、提高其吸水速率和吸水强度的几种方法,并预测了该领域今后的发展方向.     

Mild One-Pot Deoximation and Conjugate Reduction of α, β-Unsaturated Ketoximes with Hydrosilane and I2O5

The organic chemistry of polyvalent iodine compounds has experienced an unprecedented development during the last decade of 20th century.[1,2] On the other hand, despite its extensive use in industry, I2O5 (iodine pentoxide, IP) has rarely been employed in organic synthesis except as an alternative to iodoxybenzoic acid (IBX) for the dehydrogenation of aldehydes and ketones.[3] Generally, pentavalent iodine reagents, such as IBX and Dess-Martin periodinane (DMP)were used as mild and selective oxidants for oxidation of alcohols[1,2] and dehydrogenation of carbonyl compounds.[3] We wish to report herein that IP can serve as a mild and efficient reagent for the oxidative cleavage of oximes to aldehydes and ketones (Eq. 1). Most interestingly, IP can also activate hydrosilanes for reduction of alkenes. Hence, simultaneous deoximation and conjugate reduction of α,β-unsaturated ketoximes can be achieved by using IP and phenyldimethylsilane (Eq. 2).     

硅中磷塞曼杂化态的波函数混和与组成

报道了硅中磷塞曼（Ｚｅｅｍａｎ）杂化态的波函数混和与组成的直接实验观测结果和理论讨论，用高灵敏度、高分辨率光热电离谱方法定量测量了高纯硅中孤立磷杂质“反相交”（ａｎｔｉ－ｃｒｏｓｓｉｎｇ）塞曼跃迁附近跃迁强度的系统演变，由此导出杂化的束缚杂质电子塞曼能态的波函数组成。用有效质量模型框架下的变分方法计算和讨论了杂化态的波函数组成及相应的跃迁强度，并与实验结果相比较。 关键词：     

熔融织构YBa2Cu3O7-y各向异性临界电流密度的磁测量

用测磁滞迴线的方法测量熔融织构YBa₂Cu₃O_7-y超导样品的临界电流密度,计算临界电流密度时考虑了退磁场的影响并采用适合于各向异性有限样品的模型,改进了Gyorgy等人最近提出的方法,在不同取向的磁场中测同一样品的磁化曲线,得到三种不同的临界电流密度。 关键词：     

Mechanism for Phase Conjugation Reflections of Two Mutually Coherent Beams from Potassium Sodium Strontium Barium Niobate

ＭｅｃｈａｎｉｓｍｆｏｒＰｈａｓｅＣｏｎｊｕｇａｔｉｏｎＲｅｆｌｅｃｔｉｏｎｓｏｆＴｗｏＭｕｔｕａｌｌｙＣｏｈｅｒｅｎｔＢｅａｍｓｆｒｏｍＰｏｔａｓｓｉｕｍＳｏｄｉｕｍＳｔｒｏｎｔｉｕｍＢａｒｉｕｍＮｉｏｂａｔｅ￥ＺＨＡＮＧＬｉａｎｇｍｉｎ；ＺＨＡＮ...     

X射线荧光自动分类分析技术在矿产资源环境评价中的应用

在X射线荧光分析过程中,由于分析样品中元素的母质来源及形成条件不同,存在明显的吸收增强-基体效应.本文针对该类影响产生的偏差,通过研究归纳基体产生的特征和物理参数规律,提出合理正确的对样品进行分类是消除元素间基体效应的根本途径.通过神经网络方法建立样品自动分类模型,能够对各种不同的样品进行自动分类识别.经过初步应用,与传统方法进行对比,具有自学习、自组织的特点,不需要对样品做任何假设,所建立的自动分类模型稳定性好,可以多次运作,对未知样品的识别率较高,并且具有很强的容错、抗干扰能力,识别速度较快,基本上可以消除由于不同类样品元素间效应引起的基体效应影响.     

IPA型菲涅尔全息联想存贮器

本文提出了一种用菲涅尔全息片实现的IPA(Interpattern Association)型联想存贮器。其对不独立的存贮模式有较强的分辨能力,采用菲涅尔全息片,可以实现大神经元数目的光学联想存储,具有较大的存储能力。