对价支付影响因素的理论和实证分析

我国上市公司股权分置改革成功与否关系我国证券市场未来的发展。本文根据财务理论,结合国情构建6个研究假设,并以330家实施股权分置改革的上市公司为样本,应用实证研究方法,探讨非流通股东的对价送出率及流通股东的对价送达率的影响因素。研究发现股改工作中所采用的市场化博弈机制可在一定程度上保障对价方案的合理性和两类股东的利益,但仍存在诸如机构投资者未发挥议价能力等问题

A Flux Control System Based on Single Chip

介绍一种以PIC16F876为核心的流量控制系统,通过单片机与计算机通讯,实现远距离的自动控制,控制系统经使用效果良好。文章给出了系统设计原理、单片机程序流程图和硬件电路。This paper presents a flux control system based on the single chip PIC16F876.The system realizes the long distance auto control by the communication between single chip and computer.The result has been proved to be good.The design principle of the system,flow chart of single chip and the related circuits are introduced in detail

Intelligent design of hammer mill based on SolidWorks

为适应现代技术发展及产品快速更新的要求,针对机械产品中装配体结构的快速造型设计问题,以SOlIdWOrkS2011为开发平台,运用VC++编程语言,建立了锤片式粉碎机的装配体实体模型,研究了以dll开发方式进行锤片式粉碎机产品智能化与自动化设计的方法,完成了用户界面的开发。以尺寸驱动为特征,参数化驱动实现锤片式粉碎机的重新建模,自动完成了整体模型的变动,并结合实例具体说明程序代码的设计,生成了自主设计的一套锤片式粉碎机参数化建模插件。研究结果表明:该智能化设计系统可以快速、自动修改锤片式粉碎机装配下零件的参数,并且输出形象直观的装配体三维实体模型,从而实现锤片式粉碎机设计的智能化及自动化,加快了产品设计过程,提高了效率。In order to adapt the development of the modern technology and the fast renewal of the product request,aiming at rapid modeling design of the assembly in mechanical product,based on SolidWorks2011 development platform and made use of VC + + programming language embedded in SolidWorks,the solid model of the hammer mill was established,and the intelligent and automatic design method by the DLL of hammer mill was researched,the development of user interface was completed.Characterized by the dimension-driven,the parameter-driven re-modeling of hammer mill was achieved,the whole model was changed automatically,and the procedural codes combined with specific examples were designed.As a result,a parametric modeling plug-in about the self-designed hammer mill was generated.The results show that this intelligent design system can modify the parameters of the fitted parts under hammer mill quickly and automatically,and output intuitive three-dimensional solid model of the assembly,which realizes intellectualization and automation of hammer mill design,speeds up the process of product design and enhances the efficiency

Studies on the infection of freshwater crabs by Paragonimus metacercariae in Yunxiao county, Fujian

目的调查云霄县淡水蟹种类及其感染并殖吸虫囊蚴的情况。方法选取不同地理方位为调查点,捕捉各调查点的淡水溪蟹进行分类和并殖吸虫囊蚴的检查。结果全县共调查6个乡(镇)20个村,共捕捉230只蟹,查出漳州华溪蟹(n=136)、漳浦束腰蟹(n=63)和闽溪蟹(待定种)(n=31)3种;检出感染并殖吸虫蟹15只,阳性检出率为6.6%(15/230),蟹的感染指数为0.11,对福建华溪蟹和中华束腰蟹种类及分布作了修正。结论云霄县并殖吸虫宿主淡水溪蟹有3种,蟹感染并殖吸虫呈下降趋势,但仍为中度并殖吸虫疫源地。Objective To study the distribution of freshwater crabs and their infection by Paragonimus in Yunxiao county, Fujian.Methods Freshwater crabs were collected and identified.The crabs were then dissected and examined for the presence of Paragonimus metacercariae.Results Six tons of crabs from 20 villages (Yunxiao county) were collected.Three species of crabs were found , namely Sinopotamon zhangzhouense, Somanniathelphusa zhangpuensis and Minpotamon spp.The infection rate was 6.6% (15/230) for the Paragonimus, and the index of crab infection was 0.11.Species of freshwater crabs and its geographic distribution were revised for Sinopotamon fukienense and Somanniathelphusa sinensis.Conclusion Freshwater crabs are the intermediate hosts of Paragonimus in the Yunxiao county.科技部自然资源平台项目(2005DKA21104

Mechanism of Surface Formation for Two-dimensional Ultrasonic Vibration Assisted Grinding of Monocrystal Silicon with Vertical Workpiece Vibration

通过单晶硅磨削试验以及单颗金刚石磨粒划擦试验,分析垂直于工件平面的二维椭圆超声振动磨削单晶硅的表面形成机制。椭圆超声振子由压电陶瓷晶体与金属弹性体粘接制成,其伸缩模态和弯曲模态频率相同,当输入具有一定相位差的两个交流电压信号时产生二维椭圆振动。试验结果表明,由于二维椭圆振动的施加改变了单晶硅的材料去除机制,加工表面质量明显提高,表面粗糙度显著降低,磨削沟槽变浅而宽,切屑变厚而短,单晶硅材料延性域去除比例增加;通过改变超声振动振幅与磨削深度之间大小关系,可实现磨削刃对工件的连续性接触去除和断续性接触去除两种模式的转变。The mechanism of surface formation for two-dimensional elliptic ultrasonic vibration assisted grinding with the vertical direction to workpiece is investigated by grinding experiments and single point diamond abrasive scratching experiments on monocrystal silicon.The vibrator is produced by bonding a PZT on a metal elastic body,frequencies of both longitudinal mode and bending mode are nearly the same,and an elliptic motion occurs when two alternating current signals with phase difference are applied to the PZT.The experimental results show that the workpiece surface quality is improved obviously,and the surface roughness is decreased significantly.And moreover,the grinding grooves become much shallower and wider,and the chip is also much thicker and shorter.It is known that the percent of ductile mode removal material increases.In addition,as the relation between vibration amplitude and grinding depth of cut is changed,two kinds of material removal mechanism,continuous contact and interrupting cutting,can be realized.国防科研资助项目(62301090103

Development of a Two-dimensional Ultrasonic Vibration Assisted Grinding Technique of Monocrystal Silicon

基于超声振动磨削能有效提高加工效率及加工表面质量的特性,通过设计具有伸缩和弯曲两种模态的压电陶瓷椭圆振子,实现了单晶硅二维椭圆振动磨削技术。对超声振子的振动特性进行检测,证实改变压电陶瓷两电极之间的交流信号相位差和电压幅值,可得到不同形状和振幅的椭圆振动。对单晶硅进行超声磨削与普通磨削的对比试验,结果表明二维振动磨削的磨削力大幅降低,表面粗糙度显著减小,表面质量明显提高,加工表面延性域去除比例增加。从而证实二维超声振动磨削方法能够实现高效率高质量单晶硅加工。Based on the characteristics of higher machining efficiency and higher surface quality of ultrasonic vibration grinding,a two-dimensional ultrasonic vibration grinding of monocrystal silicon technique is achieved by designing elliptical vibrator with longitudinal mode and bending mode.The measurement results on the vibration characteristics of vibrator show that shape and amplitude of elliptical vibration can be modulated by changing voltage amplitude and phase difference between the piezoelectric ceramics electrodes.The grinding experimental results show that under the elliptic ultrasonic vibration assistance,grinding forces are reduced largely,the surface roughness is decreased significantly,the surface quality is improved obviously,and moreover the percentage of ductile-mode removal material increases.These indicate that high efficiency and high surface quality machining of monocrystal silicon can be achieved with elliptic vibration assisted grinding.国防科研资助项目(62301090103

基于多聚化重组抗原的检测戊型肝炎病毒IgM与IgG抗体的ELISA的建立及初步评估

建立并评估分别检测戊型肝炎 (戊肝 )病毒IgM与IgG抗体的捕获法及间接法ELISA。以原核表达的多聚化重组HEV蛋白为抗原 ,建立戊肝捕获法IgMELISA(E2 -IgM )和间接法IgGELISA(E2 -IgG)。利用 2 9只实验感染猴系列血清及多份临床急性肝炎血清、正常人血清以及单克隆抗体评估所建立的方法的敏感性与特异性 ,并与商品化试剂 (Genelabs公司抗 -HEVIgG和IgM试剂 ,GL -IgG/GL -IgM )进行比较。 2 9只恒河猴E2 -IgM和E2-IgG的阳转率均为 10 0 % ,其中 75 %在感染后 4周内阳转 ,均早于ALT异常时间。E2 -IgM持续 2～ 14周 ,平均6周 ;E2 -IgG在 70周时仍无一阴转。GL -IgG阳转率为 79 3% ( 2 3/ 2 9) ,多数晚于ALT异常时间 ,平均持续约18周 ,但最长为 1只在感染后 70周时仍为阳性。用E2 -IgM试剂盒检测 92 8份正常人血清 ,仅 2份OD值略高于0 2。检测 5 10份临床急性肝炎血清 ,可明显将其区分为 2个部分 ,一个部分OD值小于 0 2 ,其OD值分布与正常人相似 ;另一个部分OD值大于 0 4,共 131份 ,其中 10 9份大于 1 0。可能分别对应于急性肝炎中的非戊肝患者和戊肝患者。 119份非甲～丙急性肝炎中 ,E2 -IgM阳性 5 7份 ,GL -IgM阳性 2 9份 (E2 -IgM均阳性 )。 5 0 6 0份普通人群血清的E2 -IgGOD值在 0 2以下 ,形成一个

戊型肝炎诊断中血清学及核酸检测意义的研究

目的 利用恒河猴感染模型评估血清学检测和核酸检测在戊型肝炎诊断中的临床意义。 方法对86只戊型肝炎病毒(HEV)实验感染猴的系列血清和粪便标本,用反转录聚合酶链反应方法进行病毒学检测,用4种酶联免疫吸附抗体检测试剂(E2-IgM,E2-IgG,GL-IgG和YES-IgG)进行血清学检测。 结果 感染猴均产生E2-IgG抗体,除1只感染猴未检出粪便排毒和E2—IgM外,其余感染猴均出现粪便排毒和E2-IgM阳转。GL-IgG和YES-IgG的阳转率较低,而且与感染剂量相关。急性肝炎主要开始于感染后3～7周内。病毒学指标在潜伏早期即已出现,较疾病的发生约早2周,并在急性期迅速下降。E2-IgM在发病时已有约2/3阳转,并在发病后10周内完全转阴。E2—IgG几乎与E2—IgM同时阳转,在所有感染猴中持续存在,直至86周后仍无阴转。GL-IgG和YES-IgG抗体较E2抗体晚约1周,在感染后20周内已有过半数转阴。结论 E2-IgM是一个良好的戊型肝炎急性感染诊断指标,E2-IgG是一个良好的戊型肝炎既往感染诊断指标,GL-IgG和YES-IgG抗体的阳转或双份血清滴度升高可以作为辅助诊断指标,病毒核酸检测仅在发病的极早期具有诊断价值

类泛素蛋白及其中文命名

泛素家族包括泛素及类泛素蛋白,约20种成员蛋白.近年来,泛素家族领域取得了迅猛发展,并已与生物学及医学研究的各个领域相互交叉.泛素家族介导的蛋白质降解和细胞自噬机制的发现分别于2004和2016年获得诺贝尔奖.但是,类泛素蛋白并没有统一规范的中文译名. 2018年4月9日在苏州召开的《泛素家族介导的蛋白质降解和细胞自噬》专著的编委会上,部分作者讨论了类泛素蛋白的中文命名问题,并在随后的\"泛素家族、自噬与疾病\"(Ubiquitinfamily,autophagy anddiseases)苏州会议上提出了类泛素蛋白中文翻译草案,此草案在参加该会议的国内学者及海外华人学者间取得了高度共识.冷泉港亚洲\"泛素家族、自噬与疾病\"苏州会议是由美国冷泉港实验室主办、两年一度、面向全球的英文会议.该会议在海内外华人学者中具有广泛影响,因此,参会华人学者的意见具有一定的代表性.本文介绍了10个类别的类泛素蛋白的中文命名,系统总结了它们的结构特点,并比较了参与各种类泛素化修饰的酶和它们的生物学功能.文章由45名从事该领域研究的专家合作撰写,其中包括中国工程院院士1名,相关学者4名,长江学者3名,国家杰出青年科学基金获得者18名和美国知名高校华人教授4名.他们绝大多数是参加编写即将由科学出版社出版的专著《泛素家族介导的蛋白质降解和细胞自噬》的专家