Photo-Stimuli Smart Supramolecular Self-Assembly of Azobenzene/β-Cyclodextrin Inclusion Complex for Controlling Plant Bacterial Diseases

Controllable and on-demand delivery of supramolecular systems have received considerable attention in modern agricultural management, especially for managing intractable plant diseases. Here, an intelligent photoresponsive pesticide delivery system is reported based on β-cyclodextrin (β-CD) and azobenzene, which overcomes the resistance of phytopathogens caused by the irrational use of conventional pesticides. Antibacterial bioassays illustrated that designed azobenzene derivative 3a possesses the most efficient bioactivity with EC₅₀ values of 0.52–25.31 µg mL⁻¹ toward three typical phytopathogens. Moreover, the assembly of the supramolecular binary complex 3a @β-CD is successfully elucidated and displays exceptional inhibitory activity on biofilm formation. Of note, this supramolecular binary complex significantly improves the water solubility, foliar surface wettability, and shows marked light-responsive properties. In vivo anti-Xoo assays reveal that 3a @β-CD has excellent control efficiency (protective activity: 51.22%, curative activity: 48.37%) against rice bacterial blight pathogens, and their control efficiency can be elevated to values of 55.84% (protective activity) and 52.05% (curative activity) by UV–vis exposure. In addition, the 3a @β-CD are non-toxic toward various non-target organisms. This study therefore offers new insights into the potential of host-guest complexes as a feasible pesticide discovery strategy characterized by a safe, biocompatible, light-responsive release, and antibiofilm properties for overcoming intractable plant bacterial diseases.     

广义粗糙Vague集的理论研究

提出了广义粗糙Vague集概念,并分别从构造性方法和公理化方法对其进行了研究.在构造性方法中,由一个二元经典关系R-出发,构造出广义粗糙Vague集上的一对一元对偶近似算子R-,-R,并对近似算子R-,-R的性质进行了讨论.在公理化方法中,定义了一对一元对偶近似算子L,H,并对对偶近似算子L,H的最小公理集进行了研究.由研究可以发现,构造性方法中的对偶近似算子R-,-R与公理化方法中的对偶近似算子L,H是等价的.     

基于Vague集的动态多目标模糊决策方法

提出了一种基于Vague集的动态多目标模糊决策方法。根据支持（反对、中立）目标集的定义,将单时段中的各方案表示成一个Vague值,各个时段的Vague值即构成了方案的Vague集描述,通过定义理想最优方案,利用Vague集之间的加权相似度量,计算各方案Vague集与理想最优方案Vague集的相似度,按照相似度的大小对方案进行排序,从而选出最优方案。算例验证了方法的有效性。     

硝酸甘油对体外培养三叉神经节星形胶质细胞的损伤作用

目的：硝酸甘油（glyceryl trinitrate或nitroglycerin,GTN）对于体外培养的三叉神经节星形胶质细胞损伤作用,为偏头痛发病机制研究提供依据。方法：体外纯化培养大鼠三叉神经节星形胶质细胞,采用胶质纤维酸性蛋白（GFAP）免疫荧光法鉴定。不同浓度的硝酸甘油作用于星形胶质细胞后,应用Alarm blue检测细胞活力,并筛选出可以影响细胞活力的适宜刺激的浓度;适宜刺激后用Fluo-3AM为细胞内钙离子荧光指示剂,激光共聚焦显微镜测定各组星型胶质细胞内钙离子浓度的变化;RT-PCR检测IL-1β、TNF-αmRNA表达。结果：GFAP免疫荧光法显示培养的星型胶质细胞阳性率达95%左右;0.55mmol/L、1.1mmol/L和2.2mmol/L三种浓度硝酸甘油刺激星型胶质细胞后活力明显降低（P〈0.05）,但从细胞活力和形态上观察0.55mmol/L硝酸甘油刺激最佳;0.55mmol/L硝酸甘油刺激后细胞内钙略降低,IL-1β、TNF-αmRNA表达增高（P〈0.05）。结论：硝酸甘油对于体外培养的星型胶质细胞有明显的损伤作用,其机制可能与炎症因子相关。     

笔记型电脑液晶显示屏性能的模糊综合评价

怎样科学正确地评价一款笔记型电脑液晶显示屏性能的好坏是笔记型电脑制造者和使用者最关注的问题,特别是生产过程产品质量的检测尤为重要.本文根据液晶显示屏评价过程中一些相关性能参数多而评价尺度模糊等特点,提出利用模糊理论对其性能参数进行模糊综合评价.论文从生产实际出发,结合专家经验,构建了液晶显示屏性能的模糊评价模型,并应用构建的评价模型对市场上几款笔记型电脑的液晶显示屏进行了评价实验,通过评价实验证实了该模型具有评价方法的科学、简单、可靠、实用等特点.     

笔记型电脑液晶显示屏性能的模糊综合评价

怎样科学正确地评价一款笔记型电脑液晶显示屏性能的好坏是笔记型电脑制造者和使用者最关注的问题,特别是生产过程产品质量的检测尤为重要。本文根据液晶显示屏评价过程中一些相关性能参数多而评价尺度模糊等特点,提出利用模糊理论对其性能参数进行模糊综合评价。论文从生产实际出发,结合专家经验,构建了液晶显示屏性能的模糊评价模型,并应用构建的评价模型对市场上几款笔记型电脑的液晶显示屏进行了评价实验,通过评价实验证实了该模型具有评价方法的科学、简单、可靠、实用等特点。     

激光晶化制备Fe基纳米软磁材料的研究进展

综述了激光非晶晶化制备Fe基纳米软磁材料的国内外研究进展和现状.介绍了Fe基纳米软磁材料的双相组织结构和性能特征及应用领域;对比分析了传统退火晶化和激光晶化制备技术的优缺点;阐述了研究激光纳米晶化技术的重要意义和理论价值.提出了激光晶化技术制备Fe基纳米软磁材料需要重点系统研究的课题和方向.     

The cryptanalysis of a public-key implementation of finite group mappings

Minghua Qu and Vanstone [2] have proposed a public-key cryptosystem (FGM) which is based on factorizations of a binary vector space (i.e., transversal logarithmic signatures of an elementary abelian 2-group). In this paper a generalized (basis-independent) decryption algorithm is given, which shows that there are many equivalent private keys, and a method of efficiently obtaining such an equivalent private key is given. The FGM cryptosystem is thus rendered insecure. Although the FGM cryptosystem is defined in terms of linear algebra, the attack given here is essentially group-theoretic in nature. Thus this attack throws doubt on any cryptosystem which relies on the security of transversal logarithmic signatures.This author was supported by S.E.R.C. Research Grant GR/H23719.     

基于α-β-γ固定增益滤波器的机动目标跟踪方法研究

为提高电子战中对机动目标的跟踪能力,提出了基于α-β-γ固定增益滤波器的动目标跟踪技术,分析了固定增益滤波器原理和组成,阐述了α-β-γ滤波器的原理,介绍了一种固定增益滤波器跟踪方法,最后通过仿真证实了该技术跟踪强、弱机动目标的性能,并可在噪声干扰情况下获得较小的期望残差.     

B—ISDN的基本概念与标准化

本文首先介绍了宽带综合业务数字网(B—ISDN)的概念,继而引入ATM的概念;阐述了B—ISDN的基本原理、特点及标准化;最后明示了B—ISDN有待研究解决的几个问题。     

Efficient Load Transfer to Polymer‐Grafted Multiwalled Carbon Nanotubes in Polymer Composites

Multiwalled carbon nanotubes (MWNTs) grafted with poly(methyl methacrylate) (PMMA) were synthesized by emulsion reactions and used as a reinforcement for commercial PMMA. Both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the applied tensile load on the composites was transferred to the PMMA‐grafted MWNTs, leading to a strain failure of the MWNTs rather than an adhesive failure between the MWNTs and the matrix. Dynamic mechanical analysis (DMA) data showed that the storage modulus at 20 °C of the PMMA composite containing 20 wt.‐% of the PMMA‐grafted MWNTs was significantly enhanced by ～ 29 GPa (or by ～ 1100 %) as compared with commercial PMMA.     

PZT铁电薄膜介电性能测试研究

运用数字锁相技术研究了Pb(Zr,Ti)O_3(PZT)铁电薄膜的介电性能测试技术,随着薄膜微图形化尺寸的缩小,电路寄生参数的影响将逐渐变大并成为主导因素,从而严重影响薄膜介电性能测试的准确性.通过补偿方法,消除了电路寄生参数的影响,准确测量了薄膜的介电常数.通过对溶胶-凝胶制备的PZT薄膜样品的介电性能测试表明,上述补偿法可满足PZT铁电薄膜制备技术及微机电系统中器件设计对PZT微图形性能测试的要求.     

How PEDOT:PSS solutions produce satellite-free inkjets

Satellite droplets are unwanted in inkjet printing and various approaches have been suggested for their reduction. Low jetting speeds limit applications of the process. Added surfactants for wetting and conductivity enhancement may help but dynamic surface tension effects may counteract improvements. A higher fluid viscosity delays ligament break-up, but also leads to slower jets, while viscoelasticity reduces satellite formation only in certain cases. We show here that aqueous solutions of PEDOT:PSS (1:2.5 by weight) are strongly shear-thinning. They exhibit low viscosity within the printing nozzle over a wide range of jet speeds, yet rapidly (<100 μs) recover a higher viscosity at the low shear rates applicable once the jet has formed, which give the benefit of delayed satellite formation. The delay over a 0.8 mm stand-off distance can be sufficient to completely suppress satellites, which is significant for many printing applications.     

低阻钛酸锶钡基PTC材料的制备与电性能

BaTiO3正温度系数(PTC)陶瓷因其具有较高的室温电阻率而使其在低压领域中的应用受到限制,因此,有必要降低其室温电阻率.低阻化的一个途径是将金属与BaTiO3基PTC陶瓷复合来制备复合PTC材料.采用传统陶瓷工艺制备Ni/(Ba,Sr)TiO3复合PTC材料.为避免金属Ni被氧化,复合材料在弱还原气氛下烧成.为排除烧结气氛的影响而讨论金属Ni的影响,(Ba,Sr)TiO3 PTC陶瓷也在同一弱还原气氛下烧成.PbO-B2O3-ZnO-SiO2系玻璃料的加入改善了复合材料的两相分布,优化了复合材料的性能.     

硒化温度对Cu(In, Al)Se2薄膜结构和光学性质的影响

采用了磁控溅射制备Cu-In-Al金属前驱体薄膜,后硒化快速退火得到铜铟铝硒(Cu(In,Al)Se2,CIAS)薄膜.研究了硒化温度对CIAS薄膜晶体结构和光学性质的影响.研究发现CIAS薄膜的晶体结构依赖于硒化温度,其禁带宽度随硒化温度升高发生红移.研究结果表明,CIAS薄膜的最佳硒化温度为540℃,其晶体结构为纯黄铜矿结构,禁带宽度为.34 eV,对应太阳电池理论最大效率的吸收层材料禁带宽度     

KNN基无铅压电陶瓷材料制备的研究进展

碱金属铌酸盐系的(K,Na)NbO_3(KNN)因其具有高压电常数(d_(33)),高机电耦合系数,高品质因数及高居里温度(T_C)而成为无铅压电材料研究的热点。为了探索高性能KNN无铅压电陶瓷材料制备及应用,该文综述了其相关制备工艺、性能特点,重点阐述了KNN系无铅压电材料的掺杂、烧结、极化及其对性能的影响,指出了KNN无铅压电陶瓷的掺杂改性及工艺优化研究是其有效的研究方向。     

一种处理多极Davidson-Cole色散媒质的FDTD改进方案

为模拟一般Davidson-Cole色散媒质中的电波传播,本文提出了一种时域有限差分(FDTD)改进方案,改进之处体现在:(1)适用媒质从单极推广到多极情形;(2)适用媒质从无磁推广到有磁情形;(3)保留了色散模型公式的静态电导率项;(4)补充了三维问题算例.改进方案中,面临的主要困难是差分离散分数阶导数.首先,利用帕德(Padé)多项式近似媒质的介电常数;其次,通过傅里叶逆变换(IFT)导出了一组整数阶的辅助微分方程(ADEs),从而巧妙克服了该困难.几个算例的结果和分析,初步证实了改进方案的可行性和有效性.     

Stability analysis of discontinuous dynamical systems using vector Lyapunov functions

In this paper, we establish several stability results for discontinuous dynamical systems defined onR ⁺=[0, ) which make use of vector Lyapunov functions. For the scalar case, these results yield in particular theprincipal Lyapunov stability results for discontinuous dynamical systems reported earlier. We demonstrate the applicability of our results by studying a class of interconnected discontinuous dynamical systems and several specific examples.This research was supported in part by an Alexander von Humboldt Foundation Senior Research Award, Institut für Nachrichtentechnik, Ruhr-Universität Bochum, Germany, and by a Center of Applied Mathematics Fellowship, University of Notre Dame.     

基于帕德近似法模拟一般色散媒质电波传播的ADE-FDTD-CPML统一实现方案

为方便一站式处理常见几类各向同性、线性、无磁耗电色散媒质的电波传播问题,提出了一种ADE-FDTD-CPML统一实现方案:一是问题空间和吸收边界的统一处理;二是色散特性的统一建模:适用的媒质类型可以是单一的Havriliak-Negami(H-N)媒质、Davidson-Cole(D-C)媒质、Cole-Cole(C-C)媒质、Debye媒质、常规媒质或其任意组合;媒质属性可以是单极或多极的、有电耗的或无电耗的.该方案利用帕德(Padé)近似法,导出了一组整数阶辅助微分方程(ADEs),既克服了时域描述时遇到的分数阶导数困难,又展现了通用性好、复杂度低等优势.几个一维、三维算例解析、数值结果之间的对比,初步证实了统一实现方案的可行性和有效性.     

简易化学水浴法制备SnO2/p-Si异质结光电性能

SnO2薄膜沉积在晶硅衬底上通过一种简单化学水浴法以制备n-SnO2/p-Si异质结光电器件,该化学水浴法非常便宜和方便。采用XRD、XPS、紫外-可见光分光光度计和霍尔效应测试系统表征了SnO2薄膜的微结构、光学和电学性能,对SnO2/p-Si异质结的I-V曲线进行测试并分析,获得明显的光电转换特性。