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Search Results: 1 - 10 of 185388 matches for " 陈木青 "
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大历山植物区系分析及珍稀濒危保护植物
,仁钧,钱士心
植物科学学报 , 1990,
Abstract: ?安徽省大历山有维管束植物1151种(包括变种、栽培种),隶属579属154科,其中蕨类植物28科56属103种;裸子植物5科6属8种;被子植物121科517属1040种。本文主要分析大历山植物区系特征及珍稀濒危保护植物。
THE ANALYSIS OF THE FLORA IN MT.DALI, ANHUI AND THE RARE AND NEARLY EXTERMINATING PROTECTED PLANTS
大历山植物区系分析及珍稀濒危保护植物

Jiang Muqing,Chen Renjun,Qian Shixin,
.蒋
,.仁钧,.钱士心

植物科学学报 , 1990,
Abstract: There are 1151 species (including varieties cultivar) of vascular plants in Mt. Dali, which belong to 579 genera and 154 families. Among these 103 species, 56 genera and 8 families represent the pteridophytes; 8 species, 6 genera and 5 families comprise the gymnosperms; 1040 species, 517 genera and 121 families are the Angiosperms. This paper mainly analyse the flora features and rare and nearly exterminating protected plants in Mt. Dali.
温州市外来流动人口传染病的流行特征
周祖,章显传,山若,,余向华
中国公共卫生 , 2003, DOI: 10.11847/zgggws2003-19-05-59
Abstract: ?人口流动与传染病的发生和流行密切相关,近年来随着市场经济的发展,人口流动面广,流速加快,流量增大,对传染病传播的影响极为明显.外来流动人口作为一个特殊的人群,其生活、工作条件与常住人口有所不同.温州市外来流动人口较多.为了解外来流动人口传染病流行特点,更好地控制和预防其传染病的发生和流行,我们对1997~2000年温州市外来流动人口传染病的流行特征进行调查分析.现报告如下.
大数据一体机关键技术及应用研究
Key technology and application of big data machine

国良,尧海昌,李航,,刘尚东,季一,王汝传
- , 2018,
Abstract: 分析比较国内外大数据一体机产品现状,概述大数据一体机关键技术。针对国内大数据产业支撑体系尚不完善,尚未建立起兼顾安全与发展的信息安全保障体系问题,研究并提出基于国产芯片的大数据一体机,并详细介绍了相关硬件、软件和应用示范,以解决大数据的海量存储、持续扩展、运维部署、数据个性化处理等问题。通过对比国内外大数据一体机的研究设计,文中提出的基于国产芯片的大数据一体机具有数据处理安全,并发处理效率高,运行稳定等特点。
According to analysis and comparison of domestic and foreign big data machine product status, the key technology for big data machine are summarized. Aimed at the imperfect domestic big data industry supporting system and the problems, that is, the information security guarantee system considering both the security and the development of big data industry has not been established, a design of domestic chip big data machine is studied to solve the problems caused by data security, mass storage, continuous expansion of infrastructure, operation and maintenance deployment, personalized data processing, and other issues. Compared with the studies and the designs of domestic and foreign for big data machine, the domestic chip big data machine has the advantages of information security, concurrent processing efficiency, operational stability,and so on
清末民初哀情小说与欧洲感伤主义思潮

安徽大学学报(哲学社会科学版) , 2013,
Abstract: 清末民初哀情小说在文学主张、情感色调、创作方法上均受到18世纪欧洲感伤主义思潮的影响。欧洲感伤主义小说与浪漫主义诗歌随着清末民初翻译大潮传入中国,为鸳鸯蝴蝶派所接受。鸳鸯蝴蝶派翻译了大量带有感伤主义元素的作品,它们非常符合时代的感伤氛围和时人的情感需求,因而对文坛产生巨大冲击力。鸳鸯蝴蝶派在选择、借鉴、模仿的过程中,也创作了具有中国化背景的感伤主义作品,规模化地表现了对封建专制婚姻的不满与反抗,充满悲剧气氛,一些小说有意识地打破传统的连贯叙事框架,采用多种手法表达内心感受,促进了传统小说内容、形式的变革。
经济学与生态学:两种对立的世界观

地理科学进展 , 1996, DOI: 10.11820/dlkxjz.1996.01.001
Abstract: 凡经常阅读财经报刊的读者都会得出结论世界情形不错,长期经济走势看好。当然仍有问题——美国预算赤字,第三世界债务以及令人不安的石油上涨——但对经济学家而言,这些似乎都是可以解决的。甚至1991经济衰退情形下,对90年代长期经济前景的预测仍很乐观。
一种模量双向变化的梯度复合平面梁的级数解
Series solutions of graded composite plane beam whose modulus varying in bi-directions

,刘卫平,,郑百林,晏冬秀,,贾丽杰,魏冉
- , 2016, DOI: 10.13801/j.cnki.fhclxb.20160324.002
Abstract: 3D打印技术的发展使复杂梯度结构的制造更加容易,有必要对复杂梯度问题的求解开展研究;目前,关于梁结构模量沿轴向或厚度方向梯度变化问题的研究已经较多,但对模量沿2个方向同时变化的研究较少。因此,通过复数形式傅里叶分解的方法对模量以指数形式沿厚度方向和轴向同时变化梯度平面复合梁问题进行了求解。首先,采用弹性力学半逆解法得到了问题的四阶变系数偏微分控制方程的通解;然后,利用级数展开,求解了对称载荷作用下该梁的特解;最后,通过与有限元结果进行对比,说明了级数解的正确性。结果表明:当梯度双向变化时,梁结构的应力分布和变形情况更加复杂,模量较高的位置应力较大,而模量较低的位置应力较小。提出的级数解还可推广至其他相关的梯度双向变化非均匀平面和半平面问题的研究。 As the development of 3D print technology makes the manufacturing of complex graded structures more easily, it is necessary to carrying out the investigations with respect to the solving for complex graded problems. Now, the investigations about the problems that the modulus of beam structures varying along the axial direction or thickness direction grade are already more, while the investigations about the modulus varying along two directions synchronously are less. Thus a graded composite plane beam with modulus changed in exponential form synchronously along thickness direction and axial direction was investigated by using Fourier decomposition in complex form. The general solutions for four-order differential governing equation with variable coefficients were solved firstly by using semi-inverse method of elasticity. Then, the particular solution of the beam subjected to symmetric load effects was derived by series expansions. Finally, the correctness of series solutions was verified by comparing with finite element results. The results show that when the gradient varying in bi-directions, the stress distribution and deformation situations of the beam structure become more complex, that the stress is larger at the region with higher modulus, while the stress is smaller at the region with lower modulus. The series solutions proposed could be also extended to the investigation of other relevant plane or semi-plane inhomogeneous problem with graded varying in bi-directions. 中国博士后科学基金(2015M581681);中国商飞中欧合作专项(SAMC14-JS-13-012)
成像光谱技术在军事侦察中的应用

红外 , 2004,
Abstract: 成像光谱技术可以从空问上直接分析和识别被观测物的物质成分,使得从空间直接识别地球表面物质成为可能,因此在经济建设和军事侦察中有极高的应用价值。本文介绍了当前几个比较典型的采用成像光谱技术的军事侦察系统,阐述了成像光谱技术在光学子系统、电子学子系统、信息处理子系统中的关键技术,并预测了其未来的发展趋势。
南沙群岛及邻近海区的微体生物与环境研究

科学通报 , 1997,
Abstract: 由中国科学院组织的南沙综合科学考察队近10年来在我国南沙群岛及其邻近海区进行了包括地球科学各个领域的综合考察,取得丰硕的科学研究成果。其中的微体生物(包括微体古生物及其现代类群)研究中,共分析了177个站位的表层样和7个岩芯柱的937个分层样(图1),开展了包括有孔虫、介形类、放射虫、苔藓虫、腹足类、双壳类、硅藻、沟鞭藻、孢粉和钙质超微化石(颗石藻)等10个大类群的分析研究工作,几乎涉及微体生物的所有门类。该项成果以分类学研究为前提,讨论它们的现代区系特征、生态特征和沉积埋藏特征,进而分析微体生物各浮游类群和底栖类群分布与海洋环境的关系,从中总结和归纳可作为指示环境变化的指标;在此基础上进一步分析柱状样品,依据各柱状样包含的晚第四纪以来微体生物组合与演
q过程的唯一性准则

科学通报 , 1981,
Abstract: 可列状态空间情形Q过程的存在、唯一性由侯振挺得到完满的解答(全稳定情形)。胡迪鹤研究了描象空间q过程的构造,但他定义q过程的条件较强,不能完全包括可列情形的Q过程。本文提出了q过程的新定义(不能再推广),我们得到了全稳定q过程的唯一性准则,这包含了侯氏定理。
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