Acoustic logging technology research

声波测井从上世纪50年代开始，经历了几十年的发展，已经 成为测井研究的重要领域，是当今发展最快和应用最为广泛的现代测井方 法。声波测井是油气矿藏勘探和开发的最为重要的手段之一。为了满足复 杂油气矿藏的勘探开发，投入了大量资金开展声波测井方向的研究。 声波测井的物理基础是研究与岩石特性密切相关的声振动沿钻井方 向的传播特性，特点是记录了地层的纵波、横波及流体波的时差、幅度、 频率、相位等信息，而这些信息对于计算孔隙度、判断岩性、定性识别流 体性质、评价岩石力学弹性参数等具有重要的作用，并且还可以为较深的 砂泥岩储层估算岩石破裂压力值，为油藏工程提供参数，因此声波测井是 油气勘探...Since the beginning of the last century in 50s, sonic logging has experienced several decades of development, it has become an important field of well logging research, and it is the most widely used modern well logging method. Acoustic logging is one of the most important tools for the exploration and development of oil and gas deposits. In order to satisfy the exploration and development o...学位：工程硕士院系专业：信息科学与技术学院_工程硕士(电子与通信工程)学号：X201122203

Detection of incoherent broadband terahertz light using antenna-coupled high-electron-mobility field-effect transistors

The sensitivity of direct terahertz detectors based on self-mixing of terahertz electromagnetic wave in field-effect transistors is being improved with noise-equivalent power close to that of Schottky-barrier-diode detectors. Here we report such detectors based on AlGaN/GaN two-dimensional electron gas at 77~K are able to sense broadband and incoherent terahertz radiation. The measured photocurrent as a function of the gate voltage agrees well with the self-mixing model and the spectral response is mainly determined by the antenna. A Fourier-transform spectrometer equipped with detectors designed for 340, 650 and 900~GHz bands allows for terahertz spectroscopy in a frequency range from 0.1 to 2.0~THz. The 900~GHz detector at 77~K offers an optical sensitivity about $1~\mathrm{pW/\sqrt{Hz}}$ being comparable to a commercial silicon bolometer at 4.2~K. By further improving the sensitivity, room-temperature detectors would find applications in active/passive terahertz imaging and terahertz spectroscopy.Comment: 4.5 pages, 5 figure

经济发展与征管因素对税收增长的影响——基于省级面板数据的分析

经济增长积极地涵养了税源,税收征管则减少税收流失。为了进一步了解它们对税收增长的作用,本文在对我国税收增长因素研究成果进行综述的基础上,以近年来省级面板数据为对象,着重分析了以主成分法提取的经济发展因素和以税务人员总数为代表的征管因素对总税收和分税种收入的影响。文章认为,经济发展是促进我国税收增长的最重要的因素,但经济发展与征管因素对不同税种的影响有所区别

Study on the Theory and Practice of Social Security During Economic Development of China

完善社会保障体系，构建社会主义市场经济的重要支柱，是未来长时期内我国经济发展中的重要任务。本文力图从社会保障理论与实践的历史、现在和将来，借鉴国际经验，对中国社会保障体系建设和运行机制进行分析，并提出相关建议。本文的主要内容如下： 1．在对社会保障与经济发展的国际实践进行总结的基础上，本文从基本人权的实现与拓展等角度阐述了社会保障与经济发展之间的关系，并从现代市场经济形态下社会保障功能的扩大、人的需求层次提升和对福利国家的反思等方面，论证了经济发展中社会保障的统一性与层次性。本文还从我国社会保障制度变迁与经济发展的沿革进行了分析，提出了我国社会保障改革的逻辑起点。 2．以养老保险为例，本文...Improving the social security system, and building the foundation of market economic system, are important tasks during Chinese economic development for a long time in the future. Combing with the international experiences and from the past, status quo and the future of the theory and practice of social security, this article has analyzed the system construction and the operating mechanism of soci...学位：经济学博士院系专业：经济学院财政系_财政学(含税收学)学号：1552006015304

围术期停用二甲双胍对糖尿病患者血糖及认知功能影响

目的探讨围术期停用二甲双胍,改为短效胰岛素控制血糖,对行单侧全髋关节置换术的老龄糖尿病患者术后认知功能及血糖波动的影响。方法选取自2016年1月至2017年1月大连医科大学附属二院收治的79例择期行单侧全髋关节置换术的老龄糖尿病患者为研究对象。将所有患者分为3组,平素应用二甲双胍,围术期继续应用者纳入A组(n=24),平素应用降糖方式中无二甲双胍者纳入B组(n=28),平素应用二甲双胍术前1 d改为短效胰岛素者纳入C组(n=27)。分别应用简易智能精神状态检查量表(MMSE)和蒙特利尔认知评估量表(MoCA)对患者的认知功能进行评估。结果与术前相比较,3组拔管后5 min MMSE评分均有明显降低,且A组、B组MMSE评分均高于C组,差异有统计学意义(P 0. 05)。与术前比较,3组患者拔管后5 min、术后第1、3天MoCA评分均明显降低(P 0. 05)。静止及活动时3组患者VAS评分比较,差异均无统计学意义(P>0. 05)。3组患者恶心呕吐等不良反应发生率比较,差异无统计学意义(P> 0. 05)。结论二甲双胍对术后认知功能的改变未产生明显影响。围术期改为短效胰岛素不利于稳定患者血糖,对短期轻度认知功能会产生不利的影响

关于社会保障的统一性与层次性问题

我国在未来很长的一段时间内都将坚定不移地逐步完善社会主义市场经济，在这一过程中社会保障必将起着至关重要的作用。这不仅仅是完善公共财政体系的必要支柱， 更是社会公平的需要和市场经济充分发挥效率的前提。实现统一性与层次性相结合的社会保障体系必须着重解决完善社会保障的统一性，完善社会保障体系的层次性，鼓励发展非正式的社会保障方式，更好地补充保障需要，社会保障体制的整体设计应注重公平、为市场经济发展和竞争的开展提供公平环境， 但在不同层次的微观运行机制上应讲 求效率

Effects of flue gas components and fly ash on mercury oxidation

模拟研究O2、SO2和HCl三种烟气气体与飞灰存在状态对汞形态转化的影响,并探讨温度对其转化的作用.结果表明:在不同气氛中,反应温度升高有利于汞的氧化,但n2--SO2的烟气体系则相反;O2、SO2和HCl单独存在于烟气中时,对汞的氧化起到不同程度的促进作用,其中HCl的效果最好;烟气中含有O2和HCl将使汞的氧化率明显提高;当SO2与HCl同时存在于烟气中时,SO2会通过与HCl反应抑制汞的氧化过程.飞灰为氧化反应提供反应介质和催化剂,促进烟气中汞的形态转化.The effects of gas components such as O2,SO2 and HCl,the existence of fly ash,and temperature on mercury speciation were investigated.It is shown that high temperature is positive to mercury oxidation in most of the simulated flue gas system except for the N2-SO2 system.The existence of O2,SO2 and HCl in the system separately improves the oxidation process,and among them HCl performs the best.When both SO2 and HCl are in the system,the oxidation efficiency of HCl decreases due to the reaction between SO2 and HCl.Fly ash provides,reaction media and catalysts for the mercury oxidation reaction,and consequently,the existence of fly ash in the simulated flue gas can increase mercury speciation.国家自然科学基金资助项目(No.20707018);福建省科技重点资助项目(No.2008I0024);中央高校基础业务费资助项目(No.2010121078);厦门市科技计划资助项目(No.3502Z20103014

Reactivity Ratio of Methyl Acrylate with Methacrylates For Group TransFer Copolymerization

丙烯酸甲酯和甲基丙烯酸酯基团转移无规共聚的竞聚率⒇邹友思林东海张景辉潘容华（厦门大学化工系，厦门大学核磁共振实验室，厦门，361005）单体竞聚率作为一个定量数据，对于不同投料比下共聚物组成的预计和控制，共聚反应动力学和机理研究均有重要作用。丙烯酸...Statistical group transFer copolymerization of methyl acrylate(MA) with methacrylates have been perFormed For three binary systems. The copolymer compositions were determined by 1H NMR spectroscopy and the results were evaluated by the extented Kelen Tudos method. The monomer pairs concerned are (1) methyl acrylate (MA) and ethyl methacrylate(EMA), (2) MA and butyl methacrylate(BMA), (3) MA and i butyl methacrylate(iBMA). The reactivity ratios were Found to be γ MA =14.41, γ EMA = 0.01 ; γ MA =13.96, γ BMA =0.23; γ MA =8.66, γ iBMA =0.08. It was Found that acrylate is much more reactive than methacrylate For GTP and anionic copolymerization.国家自然科学基

Super-resolution Image Reconstruction Algorithm Based on Sub-pixel Shift

针对多帧图像超分辨率重建问题,利用一阶泰勒展式,在亚像素级上对图像退化过程进行建模,并建立极小化能量函数,选择grAPH-CuT算法进行能量极小化求解.为了验证本文算法的有效性,采用模拟图像退化过程和直接用相机拍摄两种方式获得低分辨率图像序列.从4x4倍重建结果的比较来看,本文算法不仅对模拟退化过程产生的低分辨率图像序列有效,而且在提高真实低分辨率图像的分辨能力方面也有很好的效果.此外,实验结果表明本文算法对噪声有较好的抗干扰能力.This paper studies the problem of multi-frame image super-resolution reconstruction.The process of image degradation is modeled by using the first-order Taylor expansion based on sub-pixel.Then the energy minimization function is established and the graph-cut algorithm is chosen to solve the energy minimization.In order to confirm this algorithm, we obtain the low resolution images by two ways: simulating image degradation and taking photos.By comparing the 4 × 4 times reconstruction results, it is shown that this algorithm is valid not only for simulation of low resolution images but also for real images.Besides, experimental results show that this algorithm possesses good anti-interference ability of noise.国家自然科学基金(61373077); 国防基础科研计划(B0110155); 国防科技重点实验室基金(9140C30211ZS8); 高等学校博士学科点专项科研基金(20110121110020); 福建省自然科学基金(2011J01365); 福建省重点项目(2014H0034); 航空科学基金(20125168001); 黄慧贞集美大学学科建设基金(ZC2014010)资助~