270 research outputs found

    A study on Changsha kiln porcelain unearthed in Tang Dynasty in Yangzhou

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    长沙窑的研究自20世纪80年代起,逐渐成为中国古陶瓷研究的重要课题。唐代长沙窑以彩绘瓷器最为突出,在唐代晚期的“海上丝绸之路”上,它的产品与越窑的青瓷和邢窑的白瓷一起,皆为我国对外输出的重要瓷器商品。长沙窑窑址位于华中腹地,其产品的外销必须依赖于交通发达的港口。而扬州作为唐代繁华的国际大港,交通便利、经济富庶、文化昌盛,是陶瓷贸易的集散中心,也是长沙窑瓷器重要的转运港口,出土了大量质量上乘,颇具研究意义的长沙窑瓷器。 本文整理分析了扬州长沙窑的现有资料,包括扬州出土长沙窑的遗址、墓葬调查、采集和发掘信息,以及相关的研究著作等。从造型、纹饰、装饰技法等入手,详细阐述扬州出土的长沙窑瓷器。在市场...Changsha Kiln research since the 1980s, China has gradually become an important subject of study of ancient ceramics. In the Tang Changsha Kiln porcelain of the most prominent in the late Tang Dynasty "Marine Silk Road", the celadon and white porcelain from Xing Yue and its products together, we are all our major exporting porcelain goods. Changsha Kiln kiln is located in the hinterland of central...学位:文物与博物馆硕士院系专业:人文学院_文物与博物馆硕士学号:1032014115229

    The Research of Microstrip Reconfigurable Antennas and Microtrip Reconfigurable Filters

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    微带线是微波电路中最常用的一种平面型集成传输线,与波导、同轴线等微波传输线相比,具有质量轻、体积小、价格低廉、可靠性高、易于系统集成等显著优点。 微带天线在通信系统中应用广泛,本文根据微带天线原理和圆极化圆形贴片天线原理,应用PIN二极管状态的切换实现分离单元的连接与断开,获得能够在多种极化方式之间切换的新型极化可重构天线。本文主要设计了两种不同形式极化可重构天线,包括构造了两个分离单元的极化可重构微带圆形贴片天线Ⅰ和构造了四个分离单元的极化可重构微带圆形贴片天线Ⅱ,最后仿真和测试结果显示通过控制PIN二极管状态的切换实现天线在圆极化与线极化之间的切换。 本文另一主要研究是基于微带线结构的...Microstrip line is one of the most used planar integrated transmission line for microwave circuits applications. Comparing with coaxial line and waveguide, it has advantages of light weight, small size, low cost, high reliability and it’s easy to be integrated in system. Microsrtip antennas have been applied in modern communication systems. In this thesis, we construct some separating units on c...学位:工学硕士院系专业:物理科学与技术学院_电磁场与微波技术学号:3312013115283

    The Intra-industry Trade Research in Manufacturing Industries between China and Japan,1990-2004:Based on an Empirical Study

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    1990年以来,经济全球化与区域经济一体化的发展给中日双边贸易带来了契机,也使两国在世界市场上的竞争面临着更加严峻的挑战。制造业是一个国家经济发展的基础和竞争力的核心,产业内贸易发展水平是一国产业、贸易结构优化升级的体现,因此分析中日两国的制造业产业内贸易对研究中日贸易的性质和发展前景有着重要的意义。本文从产业内贸易的现状、产业内贸易的效用、产业内贸易发展的影响因素三个方面分析了中日制造业产业内贸易的基本特征与变化趋势。本文研究了两个问题:一是中国与日本制造业产业内贸易的发展现状。从中日制造业产业内贸易发展过程、产业内贸易类型、贸易商品结构和贸易商品比较优势变化等几个方面论述了中日制造业产业内...Since 1990, the development of economic globalization and regionalization has brought not only an opportunity for the Sino-Japanese bilateral trade, but also a more challenging world market for the two countries.Intra-industry trade is very important to China in upgrading manufacturing industries and improving socialist market economy mechanism.And manufacturing industries represent the competitiv...学位:经济学硕士院系专业:经济学院国际贸易系_国际贸易学学号:20031301

    生物医学数据APPLEⅡPLUS微型计算机处理系统的软件设计

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    一、前言 在生理科学研究和临床中,为了提取尽可能多的生物医学信息,利用通用微型计算机处理生物医学数据,灵活性大,适应性广。本文介绍一种APPLEⅡPLUS微型计算机生物医学数据处理系统,同时给出了此系统正弦波、方波及实际的脑电信号数字处理的一些结果

    『名所句集』の宗碩

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    内窥镜下激光睫状体光凝术治疗人工晶体术后继发青光眼

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    【目的】初步评价眼内窥镜下激光睫状体光凝术(endoscopic cyclophotocoagulation,ECP)在治疗人工晶体植入术后继发青光眼中的疗效。【方法】采用Endo Optiks,URAM E2激光内窥镜系统对21例21眼人工晶体植入术后继发青光眼进行了ECP治疗,观察术后眼压变化、视力以及并发症情况,术后分别随访了6~26个月,平均18.7个月。【结果】21只眼术前眼压平均(5.08±1.69)kPa,术后平均眼压(1.96±1.23)kPa,术前、术后眼压差异有统计学意义(P<0.001)。术前平均使用降眼压药物3.3种,术后下降到0.6种,差异有统计学意义(P<0.001)。术后无需应用药物治疗而眼压≤2.8 kPa者占71.4%,需要应用局部药物治疗控制眼压≤2.8 kPa者占14.3%。患者术后视力较术前有增高(P<0.05)。21只眼中有1只眼术后出现前房积血,有19只眼术后瞳孔区出现纤维素样渗出,1只眼术后发生渗出性脉络膜脱离。这些并发症出现在早期,井在1周内愈合。所有患者术后均未出现视网膜脱离、眼压过低、眼内炎、交感性眼炎等并发症。【结论】ECP能有效地降低人工晶体植入术后继发青光眼的眼压,无严重并发症。ECP是一种治疗人工晶体植人术后继发青光眼的安全有效的方法

    党的巡视、超额在职消费及其渠道效应——基于中共十八大反腐建设的研究

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    十八大以来,党中央大力推进反腐败斗争与党风廉政建设。随着巡视制度被以党内法规的形式确立为党内监督制度,巡视工作也被赋予更多的使命与职责,目前已完成对国家机关、国有企事业单位等组织的巡视,这为我们开展巡视制度的相关研究提供了重要的现实基础。本文以被巡视国有企业的下属上市公司为检验样本,采用PSM-DID的分析方法,考察党的巡视对企业腐败行为的影响。研究发现:(1)党的巡视能够显著抑制国企高管的超额在职消费行为;(2)党的巡视对超额在职消费的抑制作用在垄断程度较高的行业更为显著;(3)渠道效应研究表明,党的巡视通过加强媒体的报道、约束地方的保护主义,从而抑制国企高管的超额在职消费行为。分位数回归及安慰剂检验结果进一步验证了结果的稳健性。本文的研究为检验反腐政策的实施效果提供了微观角度的经验证据,这为今后进一步完善党的巡视制度,加强党的建设提供了有力支撑,同时也为他国学习中国经验提供了一定借鉴。国家自然科学基金面上项目“审计与腐败治理:理论、路径与效果”(71702052)广东省2017-2018年度会计科研课题(2017A09)广州市哲学社会科学发展“十三五”规划2018年度课题(2018GZYB113

    Degradation of 2-methylisoborneol in water by hydroxyl radical

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    二-甲基异莰醇(2-MIB)是一种由蓝绿藻以及放线菌等微生物产生,具有桥环结构的饱和叔醇,在水中具有令人厌恶的土霉味,常规水处理工艺难以对其氧化; 降解.利用大气压强电离放电生成羟基自由基(·OH),对2-MIB进行氧化降解,确定了其氧化剂剂量效应、时间效应关系,并利用GC-MS对2-MIB; 氧化降解过程中间产物的分析,推断其氧化降解机制.结果表明:对初始浓度为150,300ng/L的2-MIB,分别投加总氧化剂TRO1.8,2.3m; g/L,接触反应6s去除率分别为96%和97.6%,处理后残余浓度低于10ng/L; (低于人类嗅阈值).在2-MIB水样中加入·OH淬灭剂叔丁醇(TBA)后,2-MIB的去除效果明显降低,证明氧化降解2-MIB的主要为·OH.另; 外通过对氧化降解过程中间产物分析表明,·OH能破坏2-MIB的桥环结构,并最终矿化生成CO_2和H_2O.2-methylisoborneol (2-MIB) produced by cyanobacteria and actinomycetes; is a saturated bicyclic-tertiary alcohol, which can cause earthy/musty; taste and odor in surface water. Moreover, 2-MIB is usually difficult to; be decomposed and removed by conventional water treatment process. In; this paper, hydroxyl radical (·OH) generated by a strong ionization; discharge process at atmosphere pressure was used to degrade 2-MIB in; water, of which the removal efficiency including dose effects and; contact reaction time were investigated. The intermediate products; formed in ·OH treatment process were analyzed by GC-MS, and the; oxidative degradation mechanism of 2-MIB by ·OH was discussed. Results; show that the removal rate for 2-MIB with initial concentration of 150; and 300ng/L could reach 96% and 97.6% within 6.0s, while the total; reactive oxidant (TRO) dose were 1.8 and 2.3mg/L, respectively. After; ·OH treatment, the concentration of 2-MIB in water was lower than 10ng/L; (lower than the human olfactory threshold). The degradation effects of; 2-MIB were obviously reduced by the ·OH scavengers tertiary butyl; alcohol (TBA), indicating that ·OH should be the main oxidant for 2-MIB; oxidative degradation. By analyzing the intermediates produced in the; oxidative degradation process, it was found that the bridge ring; structures of 2-MIB could be destroyed by ·OH and finally mineralized to; CO_2 and H_2O.国家科技支撑计划项目; 国家重大科研仪器研制项目; 科技部创新人才推进计划重点领域创新团队; 辽宁省重点实验室基础研究项

    高藻饮用水系统中羟基自由基降解诺氟沙星

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    在厦门翔安水厂12000t/d常规饮用水处理工艺的基础上建立了\"混凝沉淀-砂滤-·OH/NaClO氧化降解抗生素及消毒-清水池\"的处理系统,在九龙江流域高藻爆发期完成了工程化试验.结果表明,当砂滤出水总藻密度为2.04×103cells/mL时,注入相同氧化剂剂量0.5mg/L处理20s后,·OH将56ng/L的诺氟沙星降解至未检出,而NaClO仅降解至54ng/L.·OH在氧化降解抗生素的同时能杀灭全部藻细胞.根据HPLC-MS/MS检测到的降解中间产物分析,·OH氧化降解诺氟沙星通过进攻哌嗪环、萘啶环和氟原子破坏药效团,直至矿化为CO2和H2O.·OH消毒后不产生消毒副产物,检测的106项指标均达到国家《生活饮用水卫生标准》(GB 5749-2006),为我国高藻饮用水中抗生素的安全处理提供技术支撑.国家重大科研仪器研制项目(NSFC:61427804);;科技部创新人才推进计划重点领域创新团队(2015RA4008);;国家自然科学基金资助重大研究计划(91441132

    SEISMIC MICROZONING BASED ON SUPERFICIAL GEOLOGICAL CONDITION : A case study in Ota-ku, Tokyo

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    この報告は,地盤,特に表層地盤構造の諸特性にもとづく地域の地震危険度を可能な限りミクロな観点から検討しそれを細区分しようとするものである。方法は,多数のボーリング資料の収集とその上に立つ地質学的検討とそれにもとづくマップ化,地盤の周波数応答計算結果を加味した地域地盤区分,それぞれの地盤型の応答特性の諸構造物の地震危険度におよぼす影響,砂質系地盤の液状化危険度の種々の方法にもとづく検討並びにそれらのマップ化から成る。Taking Ota-ku(ward),Tokyo,as an example,a procedure leading to seismic microzoning,regional division of an urban area on the basis of relative risk evaluation prone to seismic shaking,has been studied. The following topics have been discussed for the purpose of making microzonation maps in this paper; 1: Mapping superficial geological coditions,2: Regional division based on a relationship between superficial geological conditions and the result of a frequency response calculation,3: Examination on a relationship between dynamic characteristics of many types of structure and frequency response characteristics of soils beneath them,4: Evaluation and mapping of sandy soils prone to liquefaction
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