847 research outputs found

    The Synthesis, Characterization and Application of Graphitic Carbon Nitride and Its Composites

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    工业化生产给人们的生活带来很多便利,但是同时在传统的纺织和印刷等行业,在生产过程中,产生了许多有毒有害的印染废水,这些废水一般难于被微生物处理,而用物理或化学方法处理,往往耗能耗材,成本巨大。 半导体光催化技术能在温和的条件下将太阳能转化为化学能,进而能降解处理废水中的有机污染物,在解决环境污染问题方面有着巨大的优势和应用潜力。石墨型氮化碳(g-C3N4)是一种新型的有机半导体,相较其它光催化剂它具有良好的化学惰性、热稳定性和生物相容性,因此在诸多半导体光催化剂中脱颖而出。它的禁带宽度约为2.7eV,能利用太阳光中波长<460nm的光能,并且还具有合适的价带和导带位置,在光催化领域有着诱人的...The industrialized manufacture makes people’s lives more convenient, however, there also produced plentiful poisonous and harmful organic wastewater in some industries, such as textile industry and printing industry etc. The wastewater can hardly be dealt thoroughly by microorganism, or would make a big cost while it is treated with physical or chemical methods. Semiconductor photocatalytic techn...学位:工程硕士院系专业:能源学院_工程硕士(材料工程)学号:3242014115224

    Executive Incentive, Equity Balance and Capital Occupying——From the Perspective of Stock Pledge

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    随着我国资本市场的不断发展,越来越多的公司选择公开发行股票的方式来募集生产经营所需资金。股东通过质押上市公司股权,可以在不丧失控制权的条件下便捷且低成本地进行融资。股权质押融资正是在这样的背景下发展起来的。 但是大股东往往把股权质押当作融资方式的次选,因为股权质押在股价崩盘和大股东财务困境时会使大股东资金流进一步紧张,甚至丧失公司控制权。因此,大股东往往只有在面临融资约束时才会选择股权质押融资,而这时大股东通过资金占用“掏空”上市公司的动机就很强烈。 如何从公司内部寻找有效的机制设计约束大股东在股权质押情境下的“掏空”行为,需要结合我国“一股独大”、传统公司治理机制作用有限这些实情。本文从...With the continuous development of Chinese capital market, an increasing number of companies choose public offering to raise funds for production and operation. Major shareholders might pledge copy rights in order to raise funds conveniently as well as cost-effectively without losing control. In this kind of environment, pledge of stock rights has made great strides. Pledge of stock rights is no...学位:工商管理硕士院系专业:管理学院_财务学学号:3212014115065

    A Study on the Path of Perfecting the Openness of government Information from the Perspective of Administrative System Reform -A Case Study of Local Taxation Bureau of Fujian Province

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    《中华人民共和国政府信息公开条例》(以下简称《条例》)施行8年来,包括福建省地税局在内的我国各级政府部门紧紧围绕中央行政体制改革工作部署,在各领域全面推进信息公开,强化政府平台渠道,取得了一定成效。笔者在组织和实施福建省地税系统政府信息公开中,切身感觉感受到相关理论实践日益得到政府重视、学术界关切以及民众参与,但是毋庸讳言,目前我国的政府信息公开无论是理论和实践也确实存在不少制度方面、法律方面以及利益冲突方面问题,并且随着我国的各项改革深入开展,有些问题还越来越突出。 笔者在负责福建省地税局政府信息公开中发现,我省地税系统同样不同程度地面临以上问题,同时税务系统由于掌握着大量税收经济数据,并...The People's Republic of China Regulations on Information Disclosure (the "Regulations") for eight years, the government departments at all levels focus on public concern, promote information disclosure in key areas, strengthen institutional mechanisms and platform construction, and continuously enhance the effectiveness of government information disclosure, improve Government credibility, and ach...学位:公共管理硕士院系专业:公共事务学院_公共管理硕士学号:1392013115036

    A JOINT INVERSION ALGORITHM FOR THIN LAYER IDENTIFICATION USING CEPSTRUM

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    为解决层状介质探地雷达信号频率域反演算法中存在薄层识别问题,提出一种利用倒频谱辨别薄层的联合反演算法。为了可以在没有任何先验信息的前提下,对地下薄层进行识别,引入了新的实(虚)部倒频谱,这两种倒频谱上的峰值对应地下各反射面。通过将反射系数序列频谱的虚部进行相位移动,并将结果与实部相加后,计算两者之和的倒频谱。将两者之和倒频谱上的峰值与实(虚)部倒频谱峰值进行对比,可以判断该峰值位置是否存在薄层,从而可为谱反演算法提供正确的反射面位置信息。A joint inversion method using cepstrum was presented for solving thin layers recognition problem in the frequency-domain inversion algorithm of layered media.In the case of lack of any priori information,it is possible to use true-ficnitious cepstra method to recognizing thin layers,for the quefrency peaks indicate reflection interfaces.The opperating steps are as the followings:( 1) moving the phase of the ficnitious part in the spectrum of the coefficient series.( 2) adding the results to the real part of the spectrum and calculating the cepstrum of sum.( 3) comparing the quefrency spikes on the cepstrum of the sum with that of true-ficnitious cepstrum.Thus,one can detemines if the spike represents a thin layer.贵州省教育厅自然科学基金(20090035

    破除“自我”的幻象——简论拉康精神分析学对主体概念的解构

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    过去的意识哲学认为\"自我\"作为主体是理性的,而且能够在与他人、与世界的关系中展开自己的意义,然而这仅仅是从有限的思路来讨论问题,忽视了主体所处的历史文化环境的结构性作用。弗洛伊德的人格结构让\"自我\"的非理性层面得到一定程度的解释,与之相关的\"无意识\"和欲望也都与构建人格的\"力比多\"有关。拉康的精神分析学结合了索绪尔的语言学的分析方法,通过对弗洛伊德关于\"无意识\"和\"欲望\"的观点予以重新解释,颠覆了传统的主体\"自我\"的形象,否定\"自我\"的建构性与合法性,用一种反讽的方式揭示出一个\"异化\"的\"自我\"能指概念,这样的\"自我\"不仅始终无法满足其对象的欲望,同时也是属于一种语言和文化结构性的无意识的自欺,是一个空洞的幻象。\"自我\"的本质被潜在地证明为一种不可能

    Research on Effects Caused by Parameters of Declining Superposition Picking up

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    反射波走时和梯度是反演的基本数据,从地震资料上拾取这些数据是层析成像的关键问题。文章推导和研究各参数对拾取结果的影响,最后通过实验得到拾取结果的最佳参数组,从而发现参数选取的一般规律。Travel time and gradient are basic data of inversion,picking up them from seismic data is the key issue in tomography.Various parameters which effect picking up results are derived and researched in this paper.Best parameters are obtained after carrying out experiments and general regularities of selecting parameters are also found

    Methods for Picking Gradients of Seismic Reflection Events

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    在地震信号处理中,反射波同相轴的走时和梯度是需要使用的测量数据。特别是近几年来,利用同相轴梯度进行反射成像成为一个研究热点。这样,从地震信号中检测同相轴梯度,便是基于同相轴梯度的地震信号处理不可或缺的环节。本文对地震反射同相轴梯度的计算机自动检测(拾取)方法进行了研究,主要研究内容和取得的成果为: (1)实现了基于线性倾斜叠加原理的激发点和接收点上的梯度拾取方法,对该方法中的有关参数的选取进行了分析和总结。 (2)研究了共激发点道集、共接收点道集、共中心点道集和共偏移距道集反射同相轴梯度之间的定量关系,从而可以把在共中心点道集和共偏移距道集上拾取的共中心点上和偏移距上的反射同相轴梯度值,换...In seismic signal processing, the traveltime and gradient in reflection events is required to use the measurement data. Especially in recent years, the use of the gradient with the reflection events reflective imaging to become a research hotspot. Thus, to detect seismic signals from the reflection events gradient, that is, the gradient-based reflection events integral part of seismic signal proce...学位:工学硕士院系专业:信息科学与技术学院通信工程系_信号与信息处理学号:2332008115331

    Image Super-resolution Reconstruction Algorithm Based on Spatial Adaptive Regularization

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    为提高稀疏表示系数的精度和图像的分辨率,提出一种基于稀疏表示和正则化技术的超分重建算法.首先引入自回归正则化项,通过样本图像来训练出描述图像局部; 结构的自回归模型,每个图像块自适应选择一个自回归模型用以调节解空间,实现图像局部的自适应性控制.然后,引入非局部相似正则化项作为自回归正则化项的; 补充,用于保持图像边缘清晰度.从而,完整构造出一种基于自回归正则化和非局部相似正则化的稀疏编码目标函数.为了进一步恢复图像,实现图像去噪、去模糊; ,利用总变分正则化实现全局优化.实验结果表明,与L1SR、SISR、ANR、NE + LS、NE + NNLS、NE + LLE和A + (16; atoms)等算法相比,无论在主观视觉效果还是客观评价指标上,提出的算法都取得了更好的超分重建效果.In order to improve the accuracy of sparse representation coefficients; and the resolution of the image,a novel super reconstruction algorithm; based on sparse representation and regularization technique is proposed.; First,the auto-regressive (AR) regularization term is introduced in; sparse coding objective function. The AR model which describes the local; structure of the image can be trained by using the sample images. And; each image patch adaptively selects an AR model to adjust the solution; space and realize the image local adaptive control. Then,the non-local; (NL) similarity regularization term is introduced as a complement to the; AR regularization term,which is used to preserve the edge sharpness of; the image. Therefore,the sparse coding objective function is constructed; based on the AR regularization and NL similarity regularization. In; order to restore the image and improve the performance of image; denoising and deblurring further,the total-variation regularization is; adopted to realize the global optimization. Experimental results; validate that compared with L1SR,SISR,ANR,NE + LS,NE + NNLS,NE + LLE and; A + (16 atoms) methods,the proposed approach achieves better; super-resolution reconstruction effects in both subjective visual; effects and objective evaluation criteria.国家自然科学基金项目; 泉州市科技计划项目; 华侨大学研究生科研创新能力培育计划项

    《琵琶记》研究·八《琵琶记》与中国伦理悲剧

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    Design Of Tobacco Warehouse Management System Based On RFID Technology

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    烟叶物流是烟草供应链的重要一环,同时也是现代烟草农业建设过程中着重探索的课题之一,它对促进烟草行业可持续发展具有重大意义。为了实现烟叶物流现代化、智能化、集成化的发展目标,今后烟叶物流信息化领域的研究方向将集中在物联网技术的应用上,尤其是物联网技术在烟叶仓储上的应用。由于条形码在烟叶物流领域的一系列运用瓶颈,当前行业正在积极探索替代型产品。RFID技术作为一项新兴的非接触式识别技术越来越受到重视,开始风靡全球,并进入人们的日常生活。 本文先就课题研究的背景进行说明,着重介绍课题研究的意义与目标。而后对RFID技术进行简要介绍,通过该技术与传统的条码技术的比较,总结出RFID技术在识别范围、扫...Tobacco Logistics has been an important part of the tobacco supply chain, meanwhile, it has been one of the most important studied subjects in modern Tobacco agriculture. It has important meanings to the Tobacco's sustainable development.In order to develop the Tobacco Logistics into modernize, intelligence and integration, it's necessary to research into the application of networking in Tobacco L...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201123100
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