OFDMにおける選択性マッピング方式の位相セットデザインに関する研究

電気通信大学201

牛山湖两种不同生境小型鱼类的种类组成、多样性和密度

研究了2003年春季浅水草型湖泊牛山湖小型鱼类空间分布(种类组成、多样性和密度等)与生境异质性之间的关系.根据水生植被状况、离岸距离和水深,选择了两种差异较大且有代表性的生境类型,即近岸沉水植物茂密的生境A和远岸沉水植物稀疏的生境B.使用围网(180m2)在这两种生境中进行小型鱼类的采样,采用多次标志回捕法和Zippin去除法估算了围网内小型鱼类的密度.结果表明,两种不同生境中小型鱼类的种类组成、多样性度量值和密度估算值均存在一定程度的差异:1)生境A中的渔获物由5科14种小型鱼类组成,优势种类为生活在

Transition to turbulence in the floating half zone convection

The transition process to turbulence is studied experimentally in thermocapillary convection of floating half zone. The onset of temperature oscillations in the liquid bridge of floating half zone and further transitions of the temporal convective behaviour are detected by temperature measurements in the liquid bridge. The fast Fourier transform (FFT) reveals the frequency and amplitude characteristics of the flow transition. The experimental results indicate the existence of a sequence of period-doubling bifurcations that culminates in turbulence. The measured Feigenbaum numbers are δ2 = 4.69 and δ4 = 4.6. Both results can be compared with the theoretical asymptotic value δ = 4.669

预测沙波运移的谱分析模型

沙波运移预测是海洋开发必不可少的一环。通常采用非线性谱分析方法分析沙波实测资料从而预测沙波运移。然而这种方法仅是从统计的角度进行预测,它不包含水动力、加载风速、沙质底床性质等关键因素对沙波运移的影响。对此本文提出了一种谱分析模型解决此类问题。该模型基于沙波形状不变假设,引入波谱能量平均运移速度,考虑了台风产生的风浪和涌浪,利用波浪输沙理论计算台风期间的沙波运移,厘清了一般波流作用和台风作用引起的沙波位移。模型计算结果与实测数据吻合,可以用来预测10~20年内的沙波活动和底床演化

稀有鮈鲫HAN近交系的免疫与生化标记分析

目的筛选稀有鮈鲫HAN近交系遗传质量检测标记。方法采用鳞片活体移植和同工酶聚丙烯酰胺凝胶电泳法对稀有鮈鲫HAN近交系的遗传纯度进行检测。结果在免疫标记分析中,鳞片同体移植存活率为96.7%以上,野生群体移植存活率为7.4%,而HAN系F22鳞片异体移植的成功率为80%,显著高于野生群体。在生化标记分析中,在HAN系F22中无多态性位点,不同个体的同工酶谱呈现高度一致,在野生群体中有2个多态位点即est2和est3,多态位点的比例为15.56%。结论经过多代近亲交配,稀有鮈鲫HAN近交系生化标记基因已经纯合,鳞片异体移植存活率达到80%,表明HAN系具有较高的遗传均一性。选用鳞片的异体移植及酯酶和肌蛋白分别作为免疫和生化标记对稀有鮈鲫HAN近交系进行遗传质量检测是可行的

Environmental risk assessment of intensive animal production in Jiulong River Watershed

在G IS支持下采用养分收支平衡法对九龙江流域规模化生猪养殖的环境风险进行评价。规模化养殖污染负荷在不同类型养殖场的分配、空间分布规律以及规模化养殖的环境风险评价结果表明:规模化养猪业年产粪尿量达107万t,以小型规模化养殖场产生的污染负荷最高;整体来看,规模化生猪养殖的环境风险不大,但由于养殖场的地理分布集中,造成近郊区域规模化养殖的环境风险极高;由于过多施用化肥,中远郊规模化养殖粪尿未得到合理利用而流失。位于水系附近的养殖场对水体影响较大,根据“福建省畜禽养殖污染防治管理办法”,为减少规模化生猪养殖对九龙江水质的直接威胁,需搬迁主要支流沿岸1 km范围内的规模化养猪场250个。 【英文摘要】 With the rapid growth in the number and size of intensive livestock enterprises in China,livestock waste in a huge amount has become one of the main sources of water pollution.Environmental risk assessment of the intensive animal production in the Jiulong River Watershed was conducted with the aid of GIS and the nutrient balance method.The findings of the study of spatial distribution of pollution loads and the environmental risk assessment show that a total of 1 070 000 tons of manure is produced annually ...福建省重大科技攻关项目(2002H009

长江上游圆口铜鱼的食性分析

2010年春季(4—5月)、夏季(8月)和秋季(10月)在长江上游合江江段采用三层流刺网以3h为间隔昼夜24h连续采集圆口铜鱼样本,对其食物组成、昼夜摄食节律及季节摄食节律等进行分析和研究。结果显示圆口铜鱼的食谱较广,其食物种类包括软体动物、甲壳动物、鱼类、水生昆虫、寡毛类和植物碎片等,其中以淡水壳菜的相对优势度最高,说明圆口铜鱼是以肉食性为主的杂食性鱼类;平均饱满指数和平均充塞度的昼夜变化显示其昼夜摄食节律在春季表现为白昼型,而在夏季和秋季为晨昏型。摄食率随季节变化逐渐降低,春季摄食率最高,达93.33%;秋季摄食率最低,仅为78.21%;充塞度和饱满指数均表现出相似的季节变化,即春季摄食强度明显高于夏季和秋季,而夏秋两季之间差异不显著

The wireless controlled LED Based on single-chip computer

LED（lightEmittingDiode）光源以其高亮度低能耗的特点，广泛应用于各种照明场合，近年来随着LED技术的快速发展，新兴照明产品的功能不断完善。随着社会的不断发展，单一的照明功能已经不能满足人们的照明需求。特别是在家居方面，传统灯具逐渐退出照明市场，智能化照明成为发展的方向。 本文旨在设计一个可利用手机APP控制的调光调色LED照明系统。在总结了前人LED和充分考虑人们照明需求的基础上，系统采用单片机作为主控单元，处理各个模块的信息并做出相应控制；系统灯组含有R（红）、G（绿）、B（蓝）三种颜色LED。利用色度学三基色配色原理，通过主控芯片利用PWM（PulseWidthMod...LED (light Emitting Diode) light source is widely used in various lighting occasions with its high brightness and low energy consumption characteristics. With the rapid development of LED technology in recent years, the features of emerging lighting products are constantly perfected. With the continuous development of society, the easy lighting function can not meet the needs of people's lighting....学位：工学硕士院系专业：物理科学与技术学院_工程硕士(电子与通信工程)学号：1982014115298

A Study of Contract Lands Allocation in Rural China

この論文は農林水産省で電子化されました。Contract lands were equally allocated among farm households according to the number of family members under self responsibility household system in rural China. The purpose of this paper is to discuss about the method of equal allocation of contract lands and test the equality of allocation statistically. Equality of contract land allocation is realized by classification of land fertility and determination by lot. First, village committee evaluated objectively whole village lands and classified these into 3 groups, that is, upper grade land, middle grade land and lower grade land. After that two types of lot are adopted. One is family lot and the other is individual lot. Family lot means that family draws a lot among land groups which include 3 grade lands equally. Individual lot means that individual draws a lot among each grade of lands. Anyhow, equality can be realized by lot. Equality of contract land allocation can be tested by regression from number of family members to land acreage of each household. In order to compute this regression, we use the results of fixed observation survey of each farm households done by Research Center of Rural Economy. Equality of allocation can be supported by the results of this regression. In addition, we test equality of the food land allocation and the responsibility land allocation by regression. In computed results, some villages where equality is not realized can be found. As for two-land system, equality is not necessarily supported

Study on Warranty Design in Supply Chain Based on Extended Warranty

现代制造业产品趋同性日益增强，产品创新的成本和风险越来越高，制造商开始将关注点转移到产品本身之外的特性上，并通过一些产品增值服务来表现差异化。随着售后保证对消费者购买决策的影响越来越显著，各种不同形式，不同性质的售后保证策略也开始被制造商们采用。延伸售后保证作为其中最重要的售后保证策略之一，受到学术界的重视，是近几年才开始的。目前对延伸售后保证的研究主要是从企业内部，产品本身的角度进行的，从企业外部关系，即供应链角度出发对延伸售后保证做的研究还非常少。 本文基于博弈论和消费者效用理论构建了在三种不同结构供应链下的延伸售后保证设计模型：首先基于售后保证市场垄断的假设下，考虑了由一个垄断制造商跟...The homogeneity of product in manufacturing industry has becoming more and more obvious, and the cost and risk of product innovation has been higher and higher, so, manufacturers start to pay attention to some characters beyond product, and they try to diversify their products through some value-added services. Especially, for durable products, warranty has been one of the most important factors w...学位：管理学硕士院系专业：管理学院管理科学系_管理科学与工程学号：1772008115124