摘要：This paper reports a simple yet efficient method for the synthesis of hierarchical TiO2-B nanowire@α-Fe2O3 nanothorn core-branch arrays based on a stepwise hydrothermal approach. The as-fabricated hybrid arrays show impressive performance as a high-capacity anode for lithium-ion batteries. The key design in this study is a core-branch hybrid architecture, which not only provides large surface active sites for lithium ion insertion/extraction, but also enables fast charge transport owing to the reduced diffusion paths for both electrons and lithium ions. The peculiar combination of attributes of TiO2 （good structural stability） and Fe2O3 （large specific capacity） provides the hybrid array electrodes with several desirable electrochemical features： large reversible capacity （-800 mA.h.g^-1 for specific mass capacity and -750 μA.h-cm^-2 for specific areal＂ capacity）, good cycling stability, and high rate capability. The impressive electrochemical performance, together with the facile synthesis procedure, may provide an efficient platform to integrate the TiO2 nanowire@Fe2O3 nanothorn core-branch arrays as a three-dimensional thin film electrode for lithium-ion microbatteries.

摘要：NAD(P)生物代谢在能量代谢,维持氧化还原稳态以及调节细胞寿命等许多细胞进程中有重要作用。因此,NAD生物合成途径的关键酶的抑制剂就成为备受关注的候选新药,如NAD合成酶抑制剂。本文对微生物中的NAD合成酶的催化活性特征,晶体结构,调控因子以及基于晶体结构的抑制剂设计方面进行了综述,以期为基于NAD的治疗领域打开新的思路。

摘要：Flotation indexes gradually decrease with the increase of cycle time of the backwater in bauxite floatation,and discharge of backwater brings environmental *** this study,methods such as Fenton-oxidation,adsorption and coagulation were used in the treatment of backwater,the flotation indexes were checked after backwater treatments,and Box-Behnken design(BBD)was used in the optimization of the main operating *** results reveal that flotation indexes are effectively improved after coagulation treatment by polyaluminum ferric chloride(PAFC).The optimum parameters predicted by BBD are pH 7.55,1.09 g/L PAFC dosage and temperature of 25℃.Under these optimum conditions,a maximum recovery of Al2O3 of 82.83%and a minimum A/S of 1.30 of tailings are gained,while the deviations are less than 3%from the predicted *** findings encourage the application of BBD for the optimization of critical parameters in backwater treatment.

摘要：While thiolate-protected Au nanoclusters （NCs） have drawn considerable interest in various fields, their poor stability in aqueous solution remains a major hurdle for practical applications. Here, we report a unique strategy based on ligand-shell engineering to improve the stability of thiolated Au NCs in solution. By employing two thiol-terminated ligands having oppositely charged functional groups on the surface of the NCs, we demonstrate that the electrostatic attraction between the oppositely charged functional groups of neighboring ligands could amplify the coordination among surface ligands, leading to the formation of pseudo-cage-like structures on the NC surface that could offer higher protection to the Au core in aqueous solution. The strategy developed in this study could be extended to toward practical applications. other metal NCs, further paving the way

摘要：风味是食品感知的主要内容,也是人类感官效应的重要组成部分,对人们的情感、认知以及行为取向等具有深远影响。现代科学技术的不断发展,促进了对风味所属的化学感官效应的科学化认知,风味科学在理论与应用层面的重要性也日益凸显。然而,由于风味效应感知与调控的复杂性以及相关研究涉及多领域、多学科的交叉融合,目前人们对于风味科学内涵的认识尚不十分清晰。从嗅觉、味觉和化学物理觉3个基本维度出发,通过系统梳理和总结近年来风味科学研究领域取得的成果与进展,融合化学、生物学、医药学、工程学等多学科的研究前沿与热点,阐述了风味科学研究内涵的5个方面:风味特征解码与重构、风味受体识别与功能、风味神经效应与感知、风味物质功效与健康、风味设计评价与调控,在此基础上进一步提出了风味科学研究面临的前沿与挑战。风味科学的发展不但对于基础科学研究具有重大的学术价值,而且对于提高风味相关产业的核心竞争力也有着重要的应用价值。研究旨在以此加强人们对风味科学的理解和重视,为风味科学的未来发展提供参考。

摘要：综述中国烟草过去几十年、特别是近十年重要科研突破,总结中式卷烟产品在关键技术领域取得的重要创新成果,分析了我国烟草科技发展的现状与形势,在此基础上,遵循科技发展一般规律,围绕卷烟产品这一核心和中式卷烟产品开发基本原则,研判提炼各领域技术创新的共同要素特征,提出并阐释了"烟叶生产精准化,卷烟加工智能化,产品设计数字化,降焦减害持续化"的"烟草科技四化"发展趋势。结合中国烟草发展实际,得出今后相当长时间内中式卷烟仍将是我国烟草消费主流形态的判断,而实现"烟草科技四化"是支撑中式卷烟品牌稳定发展的必然选择,是进一步巩固卷烟民族品牌的认同度和市场竞争力的有力保障。

摘要：荣获第60届金球奖的最佳影片和最佳女主角大奖,并获得第75届奥斯卡9项提名的美国影片(The Hours)系由当今美国作家迈克尔·康宁安(Michael Cunningham)的普立策(The Pulitzer Prize)获奖同名小说改编而成,其源头则是英国著名女作家弗吉尼亚·伍尔芙(Virginia Woolf)的小说***(原名The Hours).

摘要：针对大型阵列中自适应波束形成技术的实时性和鲁棒性问题,基于最小方差无失真响应(Minimum Variance Distortionless Response,MVDR)波束形成的信号模型框架,提出一种通过对导向矢量进行处理以降低干扰的自适应波束形成算法——稳健联合迭代优化-导向自适应(Robust Joint Iterative Optimization-Direction Adaptive,RJIO-DA)算法。在联合迭代优化的基础上,将降维变换矩阵的每一个列向量看作独立的方向向量,引导子空间内每一个维度上的权值迭代,同时旋转导向向量,减小了由于导向误差的不确定性而导致的性能下降。仿真实验结果表明,与现有的降维算法相比,RJIO-DA算法计算复杂度低、收敛率高、鲁棒性好,可在期望方向上稳健地聚集波束,更好地形成干扰方向的自适应零陷。

摘要：本文介绍了PDP电视机中多制式数字视频信号转换电路的设计方案。其主要功能是对模拟视频信号进行解码和数字化,并作隔行/逐行转换、尺度变换、帧频转换等处理,同时为PDP整机提供行、场同步信号以及消隐和时钟信号等。

摘要：首先分析了基于Web的产品数据管理系统功能需求，结合网络应用特点及面向对象技术， 提出一个以模块为核心来组织、管理、发布信息的分布式产品数据管理系统模型──DPDM（Distributed Product Data Management）, 并分析了其体系结构，其目的是为设计者提供一个支持协同设计的开放式开发环境，以提高产品质量，缩短开发时间。