Study of vertical structure InGaN/GaN MQWs solar cells

近年来，以氮化镓（GaN）、氮化铝（AlN）和氮化铟（InN）为代表的第三代半导成为国际研究热点。它们具有吸收系数高、迁移率高、抗辐射能力强等特性，是很好的光伏材料。合金材料InGaN的带隙可调，其光谱响应区域可覆盖大部分太阳光光谱，是高效率太阳能电池的理想材料。垂直结构的InGaN太阳能电池具有电流分布均匀且可通过生长底部反射镜的方法减少光透过损失的特长受到极大关注。在本文研究中，我们对垂直结构InGaN/GaN多量子阱太阳能电池的制作、性能测试和理论模拟进行了详细的研究。具体内容如下： （1）利用磁控溅射设备制备了低电阻率、高透过率的ITO薄膜作为InGaN材料太阳能电池的p型电极。具体...As the third generation semiconductor material, GaN, AlN and InN have become a hot research field internationally. They have many advantages such as high absorption coefficient, high carrier mobility, high saturation velocity, and superior radiation resistance, which make them the good PV material. The InGaN alloy has tunable bandgap, which make it the ideal material for realizing full spectrum so...学位：理学硕士院系专业：物理与机电工程学院_光伏工程学号：1982012115275

武夷民居风格浅谈

以武夷山下梅古村为例,分析了武夷山独具特色的古民居风格,详细介绍了武夷山古民居建筑装饰上的雕刻艺术,通过对武夷山民居的空间组织手法、空间尺度以及艺术处理手法的研究,为当代建筑设计师提供了参考借鉴的资料

Application Research of Regional Symbols in Architecture

在经济全球化的时代背景下，各地的文化有着趋同的现象。在建筑领域也是如此，全球化下的城市发展以现代化与国际化为主，渐渐失去了原本的地域色彩。缺乏城市归属感与对国际化风格的麻木，使得人们开始重新追求地域个性，寻找现代建筑与地域传统特色的结合。 本文以地域性符号为研究对象。作为一种特殊的建筑符号，地域性符号在拥有表层形式与深层内涵两种层次结构的同时，从其诞生开始，其形式就具备了某种地域象征意义。这决定了地域性符号的形式与内涵的关系更加密切，深层内涵是决定地域性符号发展的基本因素。文章分别从地域性符号的形式与内涵出发，分析现代建筑中展示地域特色的手法，从“形似”到“神似”，最终追求“形神兼备”。在分...In the process of the world economic globalization, cultures in different regions are trending to be similar, and architecture as well. The main developing trends of the city are modernization and internationalization, with the traditionally regional characteristics being lost as time goes by. Being lack of city ascription and callousness to the style of internationalization, people begin to resta...学位：工学硕士院系专业：建筑与土木工程学院建筑系_建筑设计及其理论学号：2005130256

Ag厚度对其反射率的影响

采用射频磁控溅射方法在石英片上生长不同厚度Ag薄膜,测试了Ag膜反射率变化随厚度的变化关系,利用AfM和SEM分别研究Ag膜厚度对其表面粗糙度和形貌的影响。结果表明:Ag厚度在130nM以下时,随着厚度的增加,透射率急剧下降,其反射率逐渐增加;当厚度超过130nM时,透射率不再变化,由于表面rMS的增加使得散射损耗增大,使得其反射率随着厚度增加而减小

海工高耐久自密实混凝土的研制

针对跨海桥梁工程特点与环境条件,采取七元组分设计混凝土配合比,通过限制骨料含量、采用低水胶比、复掺磨细矿粉与Ⅰ级粉煤灰以及外掺聚羧酸系高性能减水剂等技术措施,配制出适合海洋环境条件、中等强度等级、具有良好体积稳定性的高耐久自密实混凝土

Hollow micro/nanostructures metal oxide as advanced anodes for lithium-ion batteries

电动汽车和智能电网的快速发展对锂离子电池提出了更高的要求,即在拥有高能量密度和高功率密度的同时,兼有快速充放电和较高的安全性能。电极材料是电池性; 能的关键,金属氧化物因为拥有较高的比容量和安全性能,已经成为有希望替代传统商用石墨负极的新型电极材料。然而,金属氧化物负极的循环结构稳定性较差、; 电导率低,由此导致差的循环及倍率性能,极大地阻碍了其商业化应用。近年来,拥有微纳米空心结构的金属氧化物显示出了优异的电化学性能。本文介绍了制备空; 心结构金属氧化物的常用方法,讨论了各种方法的优缺点,并列举了常见空心结构金属氧化物作为锂离子电池负极时的性能表现,最后对空心结构金属氧化物未来的; 发展方向和发展前景予以展望。More efforts are needed to upgrade the performances of lithium-ion; batteries (LIBs) for their further applications in various large; electrical appliances such as electric vehicles and smart grid as these; devices require high capacity, power density, high rate capability and; especially safety. Electrode materials are the key to the performance of; LIBs. Recently, metal oxides with much higher capacities and better; safety have the prospect of becoming alternative anode materials of; commercial graphite. However, the intrinsic low charge/ionic; conductivity and poor cycling structural stability lead to poor cycling; and rate performances, which greatly hinder their commercial; applications. To overcome these disadvantages of metal oxide anodes for; LIBs, several strategies have been developed during the past decade.; Among them, metal oxide hollow micro-nanostructures exhibit excellent; electrochemical properties as anode material for LIBs. In this review,; we first describe the current commonly preparation methods to synthesize; metal oxide hollow structures and comment on their advantages and; shortages. According to some typical examples, we show the promising use; of metal oxides hollow-structured anode materials for LIBs. Finally, the; direction and prospect of metal oxide hollow micro-nanostructures using; as anode materials are further discussed.国家重点研究计划纳米科技重点专项; 国家自然科学基金; 福建省自然科学基金项目; 厦门大学校长基

Optimization and characterization of sodium carboxymethyl cellulose with a high degree of substitution prepared from bamboo shavings

从竹材加工剩余物竹屑中提取纤维素,然后制备羧甲基纤维素钠。采用PlACkETT-burMAn(Pb)设计与中心组合法对影响竹纤维羧甲基纤维素钠取代度的6个相关因素进行了研究,结果表明,关键因子为氢氧化钠与纤维素的质量比、氯乙酸钠与纤维素的质量比和醚化时间;建立此三因素对羧甲基纤维素钠取代度影响的二次回归模型,优化得到最佳制备条件是:氢氧化钠与纤维素的质量比为0.8、氯乙酸钠与纤维素的质量比为1.2,醚化时间为2 H。制得羧甲基纤维素钠的黏度为136 M PA·S,取代度为0.93。利用扫描电镜、红外光谱、X射线衍射和热重分析等对制得样品进行表征。结果表明,利用廉价的竹屑可以制备高取代度的羧甲基纤维素钠。The preparation of carboxymethyl cellulose( CMC) with a high degree of substitution( DS) using cellulose from bamboo residues is investigated.The factors affecting DS of CMC are optimized by Plackett-Burman Design( PB) and Central Composite Design.The results of PB indicate that the mass ratio of Na OH and cellulose,the mass ratio of Cl CH2 COONa and cellulose,and the etherification time are the key factors.The quadratic regression model of these three factors is established.The optimal conditions are shown as follows: 0.8 of the mass ratio of Na OH and cellulose,1.2of the mass ratio of Cl CH2 COONa and cellulose,2 hours of the etherification time.Under this condition,CMC with a DS of 0.94 and viscosity of 136 m Pa·s is obtained.The CMC is characterized by SEM,FT-IR,XRD,and TGA.It indicates that cheap bamboo shavings could be used to prepare CMC with a high DS.国家自然科学基金(21303142;31170067); 福建省中青年教师教育科研项目(JA14010); 厦门市海洋经济发展专项资金项目(14GZP59HJ29

Variation of Yield and Composition of Energy Plant Erianthus arundinaceum During Different Growth Stages

研究不同时期斑茅产量及其化学组分的变化。结果表明:斑茅生物质产量在11月达到最高,其后开始下降;整个生长发育过程中茎叶生物质产量比呈现上升趋势;含水量随生长发育的进行显著降低;叶片灰分含量全年最低为5月,从10月份开始显著增加,至12月份达到最高。茎秆灰分含量略低于叶片,全年最低为10月,最高为7月,变化幅度不大。叶片中木质素含量全年由高到低排列顺序为12月>11月>9月>10月>7月>8月>6月;茎秆中木质素含量全年由高到低排列顺序为12月>11月>9月>7月>8月>10月>6月。10月份茎秆含水量低,灰分含量最低,热值较高,结合产量和燃料品质考虑其更适于直接燃烧,而9月份叶片则更加适于作为生物转化的材料。The effect of harvesting time on the yield and chemical composition of E.arundinaceum was studied.The results revealed that the highest biomass yield was available in November, and then the proportion of leaf biomass was gradually started to decline.The water content decreased significantly while the quantity of ash in leaves remained the lowest in May, which increased significantly in October and reached the highest amount in December.The quantity of ash in the stem was slightly lower than that in the leaf with little change year around.The maximum was appeared in July and the minimum was observed in October.The lignin content in the leaf was in the following downward order: Dec., Nov., Sept., Oct., July, Aug., June, and that for the stem was: Dec.,Nov., Sept., July., Aug., Oct., June.The calorific value of the leaf was the lowest in September and the highest in October, whereas that for the stem was the highest in August.The study showed that the best biomass accumulation was usually available with the lowest moisture and ash in October, which was more suitable for the production of fuel.The results proved that the lignin content of the leaf was lower than that of stem, which may be more suitable for bioconversion.国家自然科学基金(No.31170067;No.21303142); 福建省自然科学基金(No.2012J05029); 国家重点基础研究发展计划(973计划)(No.2010CB732201

(第16回研修医症例報告会)穿刺排膿によりStreptococcus intermediusが同定された頸部リンパ節膿瘍の1例

第365回東京女子医科大学学会例会 2022年2月26日(土)オンライン会