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Search Results: 1 - 10 of 250198 matches for " 李园园 "
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明初财政运作的货币考察——“洪武型财政”的再认识
A Study of Currency in Financial Operation in the Early Ming Dynasty——Reconsideration of Hongwu Finance


- , 2018, DOI: 10.13718/j.cnki.xdsk.2018.01.018
Abstract: “洪武型财政”是近现代学者对于明初所创财政体制的一种概称,学界以往研究多聚焦于该财政模式的实物形态考察。事实上,在明初以仓为中心的实物体制背后,还存在着一种以内库为核心的京师货币系统。研究显示,钞、银、钱等货币形态在明初财政运作中仍扮演重要角色,特别是洪武中后期以财政为目的的大规模宝钞放支,致使货币形态在京师财政运作层面一度占据主导。因此,通过对制度创置环节的考察,可以认为:太祖创置的洪武型财政并非是一种完全否定货币的实物型财政体制,虽然存在银禁、钱禁等倒行举动,但其意旨仍是为另一种货币,即法定宝钞的流通扫清障碍。
Hongwu Finance is a conception of the financial system in the early Ming Dynasty created by modern scholars, and the academic research in the past has focused on the material form of the financial model. In fact, behind the warehouse as the center of the material system in the early Ming Dynasty is still the palace warehouse as the core of Beijing monetary system. This paper shows that paper money, silver, copper coins and other monetary forms still played an important role in the financial operation in the early Ming Dynasty, especially in the late period of Hongwu in order to issue and spend Baochao on a large scale, resulting in domination of monetary form in the financial operation of Beijing monetary system. Therefore, we hold that Hongwu Finance created by Taizu is not a completely negative material-type fiscal system by studying the creation of the system. Although there were silver ban, money ban and other actions, its intention was to clear obstacle for the currency of another monetary form Baochao
低环温空气源热泵系统的试验研究
申江,
工程热物理学报 , 2008,
Abstract: 介绍了研制出的带闪蒸器的涡旋压缩机低环温空气源热泵机组的样机,并对样机进行了试验研究及性能分析。试验结果表明:在-12℃的低温环境中,该系统仍可以提供足够的热量,能够满足低温环境的采暖要求。并分析了热泵系统的制热性能随着电子膨胀阀开度的变化规律
基于景观的干旱区绿洲石河子市绿地结构特征分析
Analysis of Green Space Structural Features of Shihezi City in Arid Zone Oasis Based on Landscape

,宋于洋
- , 2015, DOI: doi:10.3969/j.issn.1001-7461.2015.03.46
Abstract: 石河子市作为典型干旱区绿洲城市,深居中国内陆,干旱少雨,风大沙多,城市生态系统脆弱。利用遥感影像提取景观斑块,结合景观生态学的理论和方法来分析石河子市绿地景观结构特征。结果表明,各类型绿地面积中以单位附属绿地面积最大,道路绿地次之;公共绿地中以面积>10 000 m2的大型斑块为主,居住区绿地中各级斑块数量相当,但仍是大型斑块所占面积最大;市区绿地景观多样性指数为1.37(最大景观多样性指数为1.79),破碎化指数为22.87个?km-2,绿地廊道密度指数较高,为2.21 km?km-2。表明石河子城市绿地景观建设状况良好,但仍应加强居住区绿地景观建设,进一步完善道路绿地建设,提高绿地系统的连通性,提高绿地景观多样性,并注重使用乡土植物。
As a typical oasis city in arid area,Shihezi is landlocked in China with fragile ecosystem due to the shortage of water and little rainfall, as well as strong wind and much sand. In this paper, landscape patches were extracted from the images of remote sensing to analyze the landscape structure features of green space in the city by applying the theories and methods of landscape ecology. The results showed that the green spaces affiliated to institutions occupied the most, followed by road green space. The large patches (>10 000 m2) were found in public green spaces. The patch numbers with different areas for residential green spaces were approximately equal, however, large patches occupied the most area. The diversity index of green landscape in the city was 1.37(the maximum landscape diversity index was 1.79), fragmentation index was 22.87 km-2, and green corridor density index was higher (2.21 km?km-2). The results demonstrated that generally, the green landscape construction was in good condition in the city. Some suggestions were given, such as to strengthen the construction of the green spaces in residential areas, to improve the road green space construction, to enhance green space system connectivity, to increase green landscape diversity, and to pay more attention to the application of native plants
基于高频算法的舰船电磁环境研究
Research on the electromagnetic environment of ships based on the high frequency algorithm
 [PDF]

, 翟助群, , 宇佳, 文兴
Chinese Journal of Ship Research (SR) , 2015,
Abstract: 现代化舰船上装备有大量的电子系统和设备,研究舰船电磁环境对舰船电磁兼容性及其防御力的提高具有重要意义。首先用简单模型验证物理绕射理论(PTD)在计算目标的散射场时能够计算目标阴影区及边缘绕射场。进而采用物理光学法(PO)与PTD相结合的方法计算舰船周围电场强度,并结合美军标MIL-STD-461C,针对电磁辐射对舰船的危害进行初步预估,得出电磁辐射对舰船的危害区域以及对人员的危害区域,且舰船上层建筑所受电磁辐射危害较大。结合几何绕射理论(GTD), 计算出从源点到达桅杆处观察点的射线路径,得到引起舰船上层建筑电磁辐射危害较大的原因是电磁波从源点辐射到舰船结构时,在舰船表面发生了多次反射及绕射。结合3种算法研究舰船电磁环境,对于研究舰船电磁兼容具有重要的参考价值。
Research on the electromagnetic environment on ships that are mounted with many electric systems and equipment are of vital importance on improving the electromagnetic compatibility and protection capability. First, the physical theory of diffraction(PTD) algorithm is verified with simplified models, which can be used to calculate the target shaded area and edge diffraction field when calculating the scattered field. Then, the physical optics(PO) and PTD are combined to calculate the field around the ship illuminated by electromagnetic waves. Next, the results are compared to the MIL-STD-461C standard, and the hazard areas of the ship are estimated, revealing that the superstructure is the major hazard area. Finally, the ray tracing from the source to the view point beside the mast is obtained with the method of geometrical theory of diffraction(GTD), which successfully explains the potential threat of superstructures: the electromagnetic wave that impinges on the structure of the ship will be repeatedly reflected. In brief, the combination of a variety of algorithms for the studying of the ship electromagnetic compatibility has a great significance.
利用光密度法对掺假豆浆的定性判别研究
东华,,
食品科学 , 2014,
Abstract: ?蛋白质含量是豆浆品质评价的主要指标,实验运用近红外光谱技术获得83个真伪豆浆的光谱,并对光谱图和光密度值进行统计分析,研究以蛋白质为主要定性指标的豆浆品质等级划分的可行性,建立豆浆品质定性判别的标准。结果显示:在波长742.59~810.96nm范围内,随着豆浆样品蛋白质含量的升高,吸收光谱峰值变化越大。实验选取od810.96nm与od742.59nm做光密度差值分布图,根据83个校正集样品的光密度差值分布图,确定豆浆两级判别的检测标准为:δod742.59~810.96nm大于0.0629时,豆浆为不合格豆浆;δod742.59~810.96nm小于或等于0.0629时,豆浆为合格豆浆。根据该判别标准对37个预测集样品进行判别,17个不合格豆浆全部被判别,正确判别率100%,20个合格豆浆中有2个被误判成不合格,误判率10%,预测结果准确率较高。实验应用光密度法进行豆浆品质的评价是可行的,方法简明、结果可靠,可为豆浆品质快速检测技术的应用提供一种参考方法。
关于火山碎屑岩熔结过程的讨论及国内外研究现状综述
,,张柳毅
矿物岩石 , 2013,
Abstract: 对国内外关于火山碎屑物熔结过程的研究历史做出了简要回顾,对与熔结过程相关的术语进行了归纳和说明,进一步探讨了熔结过程中出现的结构构造.此外,分别从野外调查和室内实验两方面总结了火山碎屑的熔结机理,对其研究意义做出主要说明,以期引起国内对火山作用中的火山碎屑物及碎屑流熔结过程研究的重视,以便更好地理解火山的喷发作用和重建火山喷发历史等火山学研究中的重要问题.
小波变换和SHA-1相结合的图像压缩加密
,张绍武
中国图象图形学报 , 2013, DOI: 10.11834/jig.20130403
Abstract: 针对图像分层树集划分编码的安全性问题,提出一种将小波变换和SHA-1(securityhashalgorithm-1)相结合的图像加密算法(DSCE)。首先将图像小波变换后的系数分为低频和高频两部分,然后将低频系数、初始密钥及图像像素和,通过SHA-1置乱加密SPIHT编码高频系数;将部分加密高频系数和初始密钥,通过SHA-1置乱加密Huffman编码低频系数,在压缩过程中实现低频和高频部分相互加密。仿真结果表明,DSCE算法密钥空间大,对密钥和明文敏感,同时有效提高图像存储和传输效率。
距离继电器作为变压器低压侧故障远后备保护时的性能
,郑玉平
电力系统自动化 , 2006,
Abstract: 对Y,d接线变压器低压侧故障时高压侧线路保护距离继电器的测量阻抗进行了分析,得出装设在Y,d接线变压器高压侧线路上的距离保护对变压器低压侧的各种短路故障可以起到远后备作用。在此基础上提出圆阻抗结合四边形阻抗作为线路末端变压器后故障的远后备保护,并给出了负荷校验公式。动模试验验证了理论分析结果。
基于Kano-QFD的个性化产品属性指标重要度确定方法
,刘飞,
计算机集成制造系统 , 2014, DOI: 10.13196/j.cims.2014.11.007
Abstract: 为了定性、定量地分析顾客需求信息,实现顾客需求信息与个性化产品特征属性之间的精确映射,提出了一种集成卡诺模型和质量功能配置模型的产品属性指标重要度求解方法。在该求解方法中,采用卡诺模型定性分析需求信息,并将需求项分类;为了获得产品顾客满意度量化值,采用调研的方式统计分析需求项实现程度与顾客满意度之间的关系,并结合需求信息特征分析,分别建立了魅力需求、期望需求、基本需求和相反需求的顾客满意度数学模型|利用调整函数修正需求项的基本重要度,构建了产品规划质量屋模型,从而获得个性化产品属性指标的重要度。以个性化人像产品为例,验证了所提方法的可行性和有效性。
Manson-Haferd常数的选择及在蠕变持久寿命预测中的应用
赵杰,东明,
材料工程 , 2009,
Abstract: 对用于蠕变持久寿命预测的Manson-Haferd方法和Larson-Miller方法的对比分析表明在Larson-Miller参数模型中,依据实验数据得到的常数C的波动,对预测结果影响较大;而在Manson-Haferd参数模型中,常数(Ta,lgta)不是两个独立的变量,它们之间存在良好的线性关系;在较大范围内Manson-Haferd常数(Ta,lgta)的改变对持久寿命预测结果影响较小。选取统一的Manson-Haferd常数(450,15)关联几种耐热钢的持久性能数据,均得到了精度较高的预测结果。这为材料高温持久性能的比较及精确预测提供了便利的方法。
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