股票回购及库存股制度研究

随着各国证券市场的发展,更多的企业开始关注股票回购,在证券市场比较成熟的国家,股票回购被看作一种常用的资本运作方式,成为改善公司股本结构和资本结构的有效手段。本文在分析股票回购的基础上,对股票回购的处理方式库存股进行深入地探讨,笔者相信随着我国证券市场的发展,未来库存股制度会获得法律上的松绑,使其作用得当有效地发挥,为我国证券市场的发展做出相应的贡献。     

股票认购证的防伪特征

股票认购证的防伪技术 我国股市发展中曾经历过一段辉煌的插曲---发行股票认购证.当时被人们称为"准股票","类股票",现在已成为富有传奇色彩的股市藏品,它的品种在150种左右.由于其防伪性能很特殊,对于股证暗记的形式特点值得予以关注.     

上市公司股票质量及其评价

本文以现代质量观点为指导,提出了股票质量概念,讨论了股票的价值性、收益性、风险性、成长性、流动性和时间性等六个方面的质量特性,并给出了它们的度量方法。     

浅析股票期权对知识型员工的激励作用

期权是一种可变收入,在企业看来,是对员工的激励;在员工看来,是对企业未来的投资。人力资本是企业知识资本的重要载体,而企业的知识型员工是企业人力资本的核心。因此,对知识型员工的有效激励日益成为企业避免人才流失的重要问题。期权激励对知识型员工的一种很好的激励机制,可以降低企业所有者的代理成本,解决激励问题,并且能够避免知识型员工的流失。本文在此基础上,提出股票期权激励方式,这对于知识型员工而言,都有着强大的吸引力,应成为企业激励知识型员工的主要措施。     

浅谈经理人股票期权的会计初始确认

经理人股票期权在我国受到越来越多的关注,越来越多的企业开始试行这一制度.但关于其具体的会计处理规定却一直没有出台,包括初始确认.这远远落后于实际的需要.就试图对这方面包括的确认方式和确认时点来进行探讨.     

基于BP神经网络的改进粒子群优化股票预测

可以以较为精准的预测结果为依据来对股票市场进行及时指引与调控,这样更能保障我国国民经济的可持续顺利发展.本文的目的 是研究改进的基于粒子群优化算法的改进版BP神经网络股票预测,这种神经网络预测方法是以粒子群优化算法为基础并将其应用于股市预测,取得了较好的效果.详细给出了基于粒子群算法的神经网络模型的建立方法,同时本文还...     

电能量误差的原因分析及处理

文章根据电能测量原理,对造成山西铝厂电能误差的主要原因进行分析,并介绍采的措施及处理效果。     

建模误差对结构损伤识别神经网络的输入向量的影响

通过理论推导，得到了模型参数误差均匀分布时五种输入向量相对误差的计算公式，这些公式为结构损伤识别神经网络的输入向量的选择提供了理论指导。理论分析表明，用归一后的频率变化比或按模态点归一的一阶模态损伤信号指标构造神经网络的输入向量，能有效地降低甚至消除均匀建模误差的影响。这些公式和结论在梁和框架损伤识别的数值算例中得到了证实。此外，本对非均匀建模误差对神经网络输入向量及识别结果的影响进行了数值模拟和分析。     

数控机床误差测量方法研究

分析了数控机床误差源,在此基础上对数控机床几何误差和主轴热变形误差的测量方法进行研究。该误差测量方法在机床工业研究中具有广泛的应用范围和通用性,对进一步提高数控机床的加工精度具有重要的研究意义。     

工程和谐与工程创新的互动关系研究

工程作为人类生存和发展过程中重要而复杂的实践活动,其管理实效的提升是确保社会发展的关键环节。当前工程活动中出现了一系列创新不足及不和谐的现象,如集成化创新度较低、事故频发等。提升工程管理实效,其核心在于工程管理者在完善工程和谐与创新的基础上,实现和谐与创新的互动发展。界定工程和谐及工程创新之后,提出和谐是创新的出发点和归属;反过来,创新是维持和谐的原动力,又是实现更高层次和谐的内驱力。和谐与创新的互动关系研究,有利于人类改变传统的工程创新观,追求工程组织内部、工程和生态环境的和谐,以符合可持续发展的需要。     

Transmission characteristic of interaction between Airy pulses and solitons in silicon-on-insulator waveguides

In this paper, we numerically simulate the transmission characteristics of Airy pulses and solitons interacting in silicon-on-insulator waveguides by utilizing Split-step Fourier method implemented in MATLAB. During transmission, the energy of Airy pulse is focused, and a new Airy pulse is subsequently separated from frontal edge. The new Airy pulse and the initial pulse exhibit reversal characteristics in time domain. In process of interaction with soliton, partial energy of the main lobe is separated from Airy pulse and transmitted along soliton transmission trajectory. The soliton produce a series of end edge oscillations. When the soliton is affected by Airy pulse, the propagation distance decreases, in constrast to the trailing edge oscillation frequency. In addition, third-order dispersion, Kerr effect and two-photon absorption on Airy pulse and soliton are also mentioned. At the same time, the effect on transmission of Airy pulse and solition will be showed in different truncation coefficients, powers and pulse widths.     

边界元法在膜结构与风耦合研究中的应用

膜结构是一种风敏感性结构,结构与风的耦合作用不容忽视。本文将膜结构所处的风场简化为不可压缩势流,运用边界元法求解绕流后作用在膜结构上的风压,然后计算在风压作用下膜结构产生的变形,修正膜结构形状,再次求解变形后膜结构周围流场及作用在其上的风压,这样依次迭代,直至得到收敛的解。这种方法的有效性通过典型算例和其他方法计算结果的对比得到验证。变换膜结构的矢跨比、初始预张力及风场平均风速,研究参数变化对流固耦合的影响,为膜结构抗风研究与工程实践提供参考。     

Direct observation of the interaction between vortices and dislocations in superconducting crystals by a cryo-Lorentz EM (interaction between vortices and dislocations)

Quantized magnetic flux lines (vortices) in a Nb foil were directly observed in different magnetic fields up to 200 G by a cryo-Lorentz electron microscope. The interaction of vortices with dislocations in the specimen was examined and clarified; edge-on dislocations weakly pin individual vortices at magnetic fields below 100 G. In higher magnetic fields the formation of a regular hexagonal vortex lattice started preferentially at in-plane dislocations. At 200 G the Abrikosov vortex lattice was formed with small domains, whose centre included the dislocations, showing their important role on the formation of the vortex lattice. For a NbTi foil no clear image of vortices could be seen, because the surface was rough due to the formation of fine grains and precipitates.     

Influence of surface interaction between drug and excipient in binary mixture for dry powder inhaler applications

The present study documents the drug-excipient incompatibility in the physical mixtures and its influence on bulk homogeneity and flowability for dry powder inhalers (DPI) applications. Binary mixtures with the model drugs (aceclofenac; salbutamol sulphate) and lactose monohydrate were prepared separately at varied drug loading (1–33 wt.%), and their physicochemical properties were assessed using various characterization techniques. The DSC, P-XRD and FT-IR studies show a significant shift in the signature peak of drug and excipient while ss-NMR, LC-MS show the absence of peaks. In contrast, new peaks are observed in LC-MS and GC studies. The insights are comprehended through a series of XPS studies. The findings indicated the formation of condensed or addition compound. This is attributed to an interaction between polar protic groups (-NH-, -COOH, -OH) and hemiacetal carbon (HO-C-OR) of drug and excipient in the solid-state. It induces crystal strain and alters bulk properties related to mixing (relative standard deviation, %RSD), cohesion and flow function coefficient (FFC). However, surface modification of excipient using MgSt and aerosil R972 (model nano-particle) eliminates such inter-particle interactions, crystal level changes. It improves the bulk properties of binary mixtures pivotal for DPI performance.     

美国教授图学课程短期授课的实践及启示

常州大学过程装备与控制工程专业的工程制图与CAD课程聘请美国教授短期授课.详细分析外教的教学内容、教学组织、教材及授课特点等实践情况,提出此次尝试对我国工程图学教育的借鉴和思考.     

Venting of gas explosion through relief ducts: interaction between internal and external explosions

Relief ducts fitted to venting openings is a widespread configuration in the industrial practice. The presence of a duct has been reported to severely increase the violence of the vented explosion posing a problem for the proper design of the venting device. Several studies have reported the leading importance – in the whole complex explosion phenomenology – of a secondary explosion in the duct. Modern approaches in the study of simply vented explosions (without ducts) have focused on the study of the interaction between internal and external explosion as a key issue in the mechanisms of pressure generation. The issue is even more relevant when a duct is fitted to the vent due the confined nature of the external explosion. In this work the interaction between internal and external events is experimentally investigated for gas explosions vented through a relief duct. The work has aimed at studying mechanisms underlying the pressure rise of this venting configuration. The study has put the emphasis on the mutual nature of the interaction. A larger scale than laboratory has been investigated allowing drawing results with a greater degree of generality with respect to data so far presented in literature.     

Analysis of the interaction between polymer and surfactant in aqueous solutions for chemical-enhanced oil recovery

Most petroleum reservoirs are subjected to Improved and Enhanced Oil Recovery (IOR and EOR) processes following secondary recovery. EOR involves the application of external forces and substances to improve the chemical and physical interactions in hydrocarbon reservoirs in order to improve preferable recovery conditions. The process of chemical flooding with solutions of polymers and surfactants can be used for developing oil exploitation. Studying the interaction between surfactants and polymers is indispensable for successful oil recovery. The interaction between non-ionic and anionic surfactants and polymers in ternary mixtures was examined at different concentrations and temperatures by dynamic light scattering and gel permeation chromatography. The hydrodynamic size of surfactant-polymer composites was higher than the particle size of individual components indicating a formation of associates. The size of associates was increased by increasing the concentration of the surfactants and the temperature. It could be supposed that the polymer formed a mixed micelle with the surfactants. Gel permeation chromatography has confirmed the increase in molecular weight of the associate formed by surfactants and polymers.     

Experimental evaluation of the interaction between a masonry infill wall and the surrounding frame

This paper studies the interaction effects between a masonry infill wall and its surrounding frame. A new experimental technique is developed aiming at evaluating the loading dependent interaction effects. This includes the stage where the infill wall accumulates severe damage and cracking that are difficult to monitor with conventional devices (strain gauges and displacement transducers) or optical techniques such as digital image correlation (DIC). The experimental concept is based on detection of strains along the surrounding frame, their conversion into stress resultants, and the translation of the latter into interfacial contact tractions. It also aims at identifying the regions of contact and detachment between the frame and the infill wall and their changes during the loading path. A large‐scale experimental setup that realises the concept and demonstrates its ability to provide important new information is constructed. A complementary DIC analysis that serves as reference for the above monitoring system is also conducted. This experimental setup with its complementing combination of sensing methods allows measuring the infill wall‐frame interaction effects in a case of horizontal loading that simulates lateral seismic loads, as well as vertical loading that simulated a mechanism of progressive collapse triggered by failure of a supporting column. The paper presents the experimental concept and its implementation in the large‐scale experimental setup and explores its capabilities. Emphasis is given to the interaction effects in the deep non‐linear region where optical monitoring is adversely affected by the developing damage. The proposed experimental technique is found to be very effective and provides new information regarding the interaction of the infill wall with the surrounding frame. It is demonstrated by an experimental study simulating the loss of a frame supporting column thus enhancing the understanding of the infill wall role in the frame resistance and its contribution to avoid progressive collapse.     

A study of the interaction between a guardrail post and soil during quasi-static and dynamic loading

A roadside guardrail system is anchored in gravel beside a roadway to eliminate the risk of fatal accidents during off-road crashes and collisions with hazardous roadside objects. The desired safety behaviour is ensured not only by the guardrail structure itself, but also by the interaction between the gravel and the guardrail post. The interaction of gravel with a Sigma-post of a standard Swedish guardrail was studied in experiments and numerical analysis. The aim was to measure the strength of the single post embedded in gravel and use the data to validate a computer model for the investigation of the soil–post interaction. A quasi-static and dynamic test series were designed and carried out. Two corridors were formed by the test data for the quasi-static and dynamic loading conditions, respectively. A parametric study was subsequently conducted to investigate the influence of the gravel stiffness on the soil–post interaction through computer simulations using LS-DYNA. The numerical results showed that the LS-DYNA soil and concrete model and the Cowper–Symonds steel model effectively captured the soil–post interaction since the calculated strength of the post agreed with the corridors of the test data. The input parameters for the soil and concrete material model were recommended for roadside gravel in crash analyses.     

荧光光谱与Zeta电位法研究十二烷基二甲基氧化胺与DNA的相互作用

通过荧光光谱与Zeta电位法研究了十二烷基二甲基氧化胺(DDAO)与鲑鱼精DNA的相互作用.非离子态DDAO胶束与DNA间存在弱的疏水相互作用.阳离子态DDAO与DNA的强烈静电相互作用导致体系荧光猝灭.胶束的形成有利于DNA构象的压缩与体系Zeta电位的提高.外加NaCl的静电屏蔽作用减弱了DDAO胶束与DNA间的静电引力.