Design and Implementation of Community Network Video Centralized Management System

随着我国对数字信息化城市建设的认识和整改速度的不断加快，社区安全性管理的要求也在逐渐提高，社会及政府对于社区安全防护制订了一系列措施，住户在选择住房过程中对于社区的安全性要求也不断升高。由于上述原因社区越来越意识到住户安全的重要性，同时将管理学的思想逐渐融入社区管理，信息集中化的视频管理日益受到重视。 根据上述背景，本论文将针对中小型社区建设一个集中化网络视频管理，主要研究内容如下： 1、本文基于J2EE平台和Oracle11g数据库设计并实现了一套具有普通用户、社区管理员和系统管理员操作权限分配的管理系统。系统的开发为社区管理人员提供了视频管理服务。 2、以软件工程中的瀑布模型为设计主...With the rapid development of urban construction of digital information and rectification speed awareness, community security management requirements are also gradually increased, social security and government for the community to develop a series of measures in the selection of households for community housing process safety requirements are rising. For these reasons more and more aware of the i...学位：工学硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323136

A Study on the Evaluation of Chinese Option-Embedded Bonds and Pricing Errors :Based on Binomial Tree Model and Trinomial Tree Model

本文使用了Hull-White模型、Black-Karasinski模型和Black-Derman-Toy模型，并根据风险利率定价和无风险利率下的违约概率定价两种不同的定价过程，对2015年1月1日到2015年12月31日在中国市场中流通且交易天数最多的60支可回售债券进行定价，发现Hull-White违约率模型在六种模型中表现最好。之后我们把Hull-White违约率模型在2015年期间的定价误差作为被解释变量，选取了与宏观经济水平、企业微观经营状况和债券流动性水平相关的一共9个变量作为解释变量进行面板数据回归，并根据回归系数对2016年1月1日到2016年6月30日之间Hull-White...In this thesis, we evaluated 60 most traded puttable bonds in Chinese bond market between January 1, 2015 and December 31, 2015, applying Hull-White model, Black-Karasinski model and Black-Derman-Toy model in combination with two dif-ferent pricing processes: risky interest rate pricing method and the probability of de-fault pricing method. The systematic comparison indicates Hull-White default ra...学位：经济学硕士院系专业：王亚南经济研究院_数量经济学学号：2772014115275

Design and Implementation of Piano Teaching Assistant System Based on Web

基于WEB的钢琴课程教学辅助系统是从艺术专业课教学工作的角度出发，用计算机和网络技术对艺术专业课教学工作流程进行信息化管理，以提升艺术专业课教学工作的效率和质量，为艺术专业课教学工作的信息化和科学化发展提供支持。本文按软件工程的设计思想及系统开发的流程，详尽的分析了基于WEB的钢琴课程教学辅助系统设计与实现的整个过程，包括该系统的需求分析、总体设计和详细设计、系统的实现与测试等有关过程。本文依据作者自身的学校教学工作和此次研究生学习经历，对基于WEB的钢琴课程教学辅助系统的设计与实现进行研究。希望本文的研究成果能够促进同类课程的教学工作效率提升，并对相关课题的研究提供些许有价值的参考。The piano teaching assistant system based on WEB carries out information management for the piano teaching process by adopting the computer and network technology from the perspective of teaching for art major so as to improve the efficiency and quality of the teaching for the professional courses of piano and provide support for the information and scientific development of the professional teach...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323118

Delineating effects of tensor force on the density dependence of nuclear symmetry energy

In this talk, we report results of our recent studies to delineate effects of the tensor force on the density dependence of nuclear symmetry energy within phenomenological models. The tensor force active in the isosinglet neutron-proton interaction channel leads to appreciable depletion/population of nucleons below/above the Fermi surface in the single-nucleon momentum distribution in cold symmetric nuclear matter (SNM). We found that as a consequence of the high momentum tail in SNM the kinetic part of the symmetry energy $E^{kin}_{sym}(\rho)$ is significantly below the well-known Fermi gas model prediction of approximately $12.5 (\rho/\rho_0)^{2/3}$. With about 15% nucleons in the high momentum tail as indicated by the recent experiments at J-Lab by the CLAS Collaboration, the $E^{kin}_{sym}(\rho)$ is negligibly small. It even becomes negative when more nucleons are in the high momentum tail in SNM. These features have recently been confirmed by three independent studies based on the state-of-the-art microscopic nuclear many-body theories. In addition, we also estimate the second-order tensor force contribution to the potential part of the symmetry energy. Implications of these findings in extracting information about nuclear symmetry energy from nuclear reactions are discussed briefly.Comment: Talk given by Chang Xu at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS

Too massive neutron stars: The role of dark matter?

The maximum mass of a neutron star is generally determined by the equation of state of the star material. In this study, we take into account dark matter particles, assumed to behave like fermions with a free parameter to account for the interaction strength among the particles, as a possible constituent of neutron stars. We find dark matter inside the star would soften the equation of state more strongly than that of hyperons, and reduce largely the maximum mass of the star. However, the neutron star maximum mass is sensitive to the particle mass of dark matter, and a very high neutron star mass larger than 2 times solar mass could be achieved when the particle mass is small enough. Such kind of dark-matter- admixed neutron stars could explain the recent measurement of the Shapiro delay in the radio pulsar PSR J1614-2230, which yielded a neutron star mass of 2 times solar mass that may be hardly reached when hyperons are considered only, as in the case of the microscopic Brueckner theory. Furthermore, in this particular case, we point out that the dark matter around a neutron star should also contribute to the mass measurement due to its pure gravitational effect. However, our numerically calculation illustrates that such contribution could be safely ignored because of the usual diluted dark matter environment assumed. We conclude that a very high mass measurement of about 2 times solar mass requires a really stiff equation of state in neutron stars, and find a strong upper limit (<= 0.64 GeV) for the particle mass of non-self- annihilating dark matter based on the present model.Comment: Astroparticle Physics (2012) in Pres

Extended quark mean-field model for neutron stars

We extend the quark mean-field (QMF) model to strangeness freedom to study the properties of hyperons ($\Lambda,\Sigma,\Xi$) in infinite baryon matter and neutron star properties. The baryon-scalar meson couplings in the QMF model are determined self-consistently from the quark level, where the quark confinement is taken into account in terms of a scalar-vector harmonic oscillator potential. The strength of such confinement potential for $u,d$ quarks is constrained by the properties of finite nuclei, while the one for $s$ quark is limited by the properties of nuclei with a $\Lambda$ hyperon. These two strengths are not same, which represents the SU(3) symmetry breaking effectively in the QMF model. Also, we use an enhanced $\Sigma$ coupling with the vector meson, and both $\Sigma$ and $\Xi$ hyperon potentials can be properly described in the model. The effects of the SU(3) symmetry breaking on the neutron star structures are then studied. We find that the SU(3) breaking shifts earlier the hyperon onset density and makes hyperons more abundant in the star, in comparisons with the results of the SU(3) symmetry case. However, it does not affect much the star's maximum mass. The maximum masses are found to be $1.62 M_{\odot}$ with hyperons and $1.88 M_{\odot}$ without hyperons. The present neutron star model is shown to have limitations on explaining the recently measured heavy pulsar.Comment: 7 pages, 7 figures, Phys. Rev. C (2014) accepte

Nuclear Three-body Force Effect on a Kaon Condensate in Neutron Star Matter

We explore the effects of a microscopic nuclear three-body force on the threshold baryon density for kaon condensation in chemical equilibrium neutron star matter and on the composition of the kaon condensed phase in the framework of the Brueckner-Hartree-Fock approach. Our results show that the nuclear three-body force affects strongly the high-density behavior of nuclear symmetry energy and consequently reduces considerably the critical density for kaon condensation provided that the proton strangeness content is not very large. The dependence of the threshold density on the symmetry energy becomes weaker as the proton strangeness content increases. The kaon condensed phase of neutron star matter turns out to be proton-rich instead of neutron-rich. The three-body force has an important influence on the composition of the kaon condensed phase. Inclusion of the three-body force contribution in the nuclear symmetry energy results in a significant reduction of the proton and kaon fractions in the kaon condensed phase which is more proton-rich in the case of no three-body force. Our results are compared to other theoretical predictions by adopting different models for the nuclear symmetry energy. The possible implications of our results for the neutron star structure are also briefly discussed.Comment: 15 pages, 5 figure

Research and Implementaion of Autocontrol of Circulating Fluidized Bed Boiler Based on Harmonas-DEO

我国是产煤大国，也是用煤大国，一次能源消耗中，煤约占76％，而其中 84%是直接用于燃烧的。由于燃烧技术不高，使得燃烧不够充分，以至于每年因 煤燃烧有87％的SO2和67％NOX排入大气，造成严重的环境污染。因此优化燃 煤锅炉的燃烧控制，发展高效、低污染的清洁燃烧技术是当前亟待解决的问题。 流化床锅炉是一种高效率、清洁型的锅炉，在热电项目中被广泛使用。然而其工 艺控制的对象有着多变量、非线性、时变和强耦合大滞后的特点。所以一套优质 高效的DCS控制系统是十分必要的。 本文以厦门某热电厂3台220t/h循环流化床锅炉项目为背景，首先对循环 流化床锅炉在国内外的发展历程进行了回顾，...China is a major coal producer and consumer. In primary energy consumption, coal accounts for about 76%, of which 87% is used directly for combustion. As the burning technology is not high, so burning inadequate, resulting in the burning of coal every year, 87% of the SO2 and 67% NOX into the atmosphere, resulting in serious environmental pollution. Therefore, optimization of coal boiler combu...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X200823002

Tensor correlation, pairing interaction and deformation in Ne isotopes and Ne hypernuclei

We study tensor and pairing effects on the quadruple deformation of neon isotopes based on a deformed Skyrme-Hartree-Fock model with BCS approximation for the pairing channel. We extend the Skyrme-Hartree-Fock formalism for the description of single- and double-lambda hypernuclei adopting two different hyperon-nucleon interactions. It is found that the interplay of pairing and tensor interactions is crucial to derive the deformations in several neon isotopes. Especially, the shapes of $^{26,30}$Ne are studied in details in comparisons with experimentally observed shapes. Furthermore the deformations of the hypernuclei are compared with the corresponding neon isotopic cores in the presence of tensor force. We find the same shapes with somewhat smaller deformations for single $\Lambda$-hypernuclei compared with their core deformations. It is also pointed out that the latest version of hyperon interaction, the ESC08b model, having a deeper $\Lambda$ potential makes smaller deformations for hypernuclei than those of another NSC97f model.Comment: 13 pages, 5 figures, Physical Review C 2013 in pres

Hot Nuclear Matter Equation of State with a Three-body Force

The finite temperature Brueckner-Hartree-Fock approach is extended by introducing a microscopic three-body force. In the framework of the extended model, the equation of state of hot asymmetric nuclear matter and its isospin dependence have been investigated. The critical temperature of liquid-gas phase transition for symmetric nuclear matter has been calculated and compared with other predictions. It turns out that the three-body force gives a repulsive contribution to the equation of state which is stronger at higher density and as a consequence reduces the critical temperature of liquid-gas phase transition. The calculated energy per nucleon of hot asymmetric nuclear matter is shown to satisfy a simple quadratic dependence on asymmetric parameter $\beta$ as in the zero-temperature case. The symmetry energy and its density dependence have been obtained and discussed. Our results show that the three-body force affects strongly the high-density behavior of the symmetry energy and makes the symmetry energy more sensitive to the variation of temperature. The temperature dependence and the isospin dependence of other physical quantities, such as the proton and neutron single particle potentials and effective masses are also studied. Due to the additional repulsion produced by the three-body force contribution, the proton and neutron single particle potentials are correspondingly enhanced as similar to the zero-temperature case.Comment: 16 pages, 8 figure