Correlation Analysis of Tax Preference And Growth Ability of Small And Micro Enterprises

小微企业是促进经济发展和社会进步的重要力量，在拉动就业、改善民生和研发创新方面发挥着无可替代的作用，受到各国政府的普遍重视。然而，由于小微企业具有经营规模小、融资成本高、抗风险能力弱等特点，在激烈的市场竞争中，普遍表现出实力较弱、竞争力不强等劣势，在其发展过程中往往遇到一个问题就会导致企业破产或倒闭。为了减轻小微企业税收负担，促进小微企业持续健康发展，我国政府颁布了一系列针对小微企业的税收优惠政策。特别是自2011年起至今，更是进入了小微企业税收优惠政策颁布和实施的密集期，小微企业获得了前所未有的税收照顾。那么，这些针对小微企业的税收政策效果如何？ 本文以浙江省的小微企业为研究样本，围绕税收...The small and micro businesses are important strength for national economy progress and social development,and they play an irreplaceable role in promoting employment ,improving people’s livelihood and technological innovation. However, small and micro businesses are characterized by small size, high financing cost, weak ability to resist risk, etc. And they show weak strength as well as low compe...学位：税务硕士院系专业：经济学院_财政学学号：1552014115188

梯度纳米结构金属材料力学性能和加工硬化研究

通过准静态拉伸实验和循环应力松弛实验,同时结合微观表征,探究梯度纳米结构的力学性能,可动位错交互作用机制以及相应的加工硬化行为。该工作可为提升超细晶金属均匀拉伸伸长率提供方法,并对梯度结构同时提升强度和塑性的应用提供理论依据

不信任研究脉络梳理与未来展望

不信任是指个体基于对他人缺乏能力、善意或不负责任的预期而保护自己不受伤害的状态。随着不信任作为一个独立的概念从信任中分离出来,不信任逐渐成为学者们研究的另一热点问题。本文从不信任的概念演进,不信任的类型、维度及作用机理,不信任的影响因素以及不信任的影响效应等方面对现有不信任研究成果进行了评介,并在分析现有研究不足的基础上指出了未来的相关研究方向

氟生记

氟及其化合物在生产和生活中有着重要的应用。自氟第一次被化学家发现并在实验室中制备至今,氟一直和人们如影随形,本文将氟拟人化,以传记的形式,采用传记体,回顾了氟的发展史和应用史。国家基础科学人才培养基金(J1310024

Integrating Automatic Bio-manipulation Algorithm Theory with Software

在生命科学研究中,生物操作主要存在操作者训练时间长、操作成功率和效率低、操作缺乏一致性和重复性等问题,自动化生物操作可以解决这些问题。将多个商用设备集成在一起,利用视觉系统与机械手系统的映射矩阵建立误差校正方程,采用局部递归和全局优化标定的方法减小目标点的定位误差。在此基础上,利用卡尔曼滤波器建立系统控制方程,控制操作探针精确定位。最后,用程序实现了算法理论,并将该算法与其他设备驱动模块集成在一起,建立了柔性的、用户界面友好的软件系统。实验结果表明:建立的算法理论和软件系统,可以自动控制操作探针精确运动,运动精度在1个像素范围内。For the study of life sciences,bio-manipulation faces such challenges as long time for operator training,low success rate,low efficiency,operation inconsistency and repetition.We believe that automatic bio-manipulation can solve these challenges.We integrate several commercial devices and use the matrix that maps the visual system with the robotic system to derive the error correction equation.We also use the local recurrence and global optimization calibration method to reduce the target point′s positioning error.On this basis,using the Kalman filter,we establish the systems′ control equations to control the precise positioning of the bio-manipulation probe.Finally,we implement the algorithm theory and integrate the algorithm with the drive modules of other devices,thus establishing a flexible and user-friendly software system.The experimental results show that the algorithm theory and software systems thus integrated can automatically control the probe′s accurate motion,the motion accuracy being within one pixel.国家自然科学基金项目(50875222);福建省自然科学基金项目(2009J01265)资

Control Method of Micro-Manipulation System for Fast Precision Probe Positioning

为了快速、精确定位操作细胞的探针,利用视觉空间的特征运动误差对视觉空间与机械手空间的映射矩阵进行校正,研究了局部视觉空间重复校正方法以及误差趋近极小值的最小二乘全局校正方法.为了减小随机噪声对精度的影响,用校正后的映射矩阵替换卡尔曼滤波器状态方程中的输入系数矩阵,利用卡尔曼滤波器估计方程控制特征运动.通过实验求取映射矩阵校正后的特征运动误差,由于取点有限以及影响精度的参数较多,经过重复校正使误差趋近极小值.应用最小二乘全局校正方法,可使特征运动误差控制在5个像素范围内.采用全局校正后的映射矩阵替换卡尔曼滤波器状态方程中的输入系数矩阵,并用卡尔曼滤波器控制特征运动,可使特征运动误差控制在1个像素范围内.系统校正后,当探针跟踪孔直径为100μM、相邻孔间距为400μM的孔阵列时,跟踪10个孔的时间为14 S.In order to position the probe that operates cells fast and precisely,the movement error of characteristic point in vision space was used to revise mapping matrix of vision space and manipulator space.Repeat revision method based on local vision space and the least squares method based on global revision which can make errors approach the minimum were researched.In order to reduce the influence of random noise on precision,the input coefficient matrix of state equation of Kalman filter was replaced by the revised matrix,and the movements of characteristic points were controlled by the estimate equation of Kalman filter.Through the experiments,the movement errors of characteristic points after revising were obtained.In addition,to make errors approach the minimum,repeat revision was needed due to limited points and too many parameters which influence precision.The movement errors of characteristic points were controlled within 5 pixel if the least squares method based on global revision was used.When the input coefficient of state equation of Kalman filter was replaced by the revised matrix and the movements of characteristic points were controlled by the Kalman filter,the movement error can be controlled within one pixel.After revising,the time spent on tracking 10 holes of array is 14 s when the diameter is 100 μm and distance between holes is 400 μm.国家自然科学基金资助项目(50875222);福建省自然科学基金资助项目(2009J01265