6 resultados para 1947-1949
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
本文集共收录了作者24篇期刊论文和研究报告。其中，1943～1955年期间发表的14篇论文内容涉及直管中的可压缩流动、有限振幅柱面和球面波的传播、可压缩流体二维无旋亚声速、超声速混合型流动和上临界马赫数、光滑跨声速绕流及其稳定性、斜激波从平板边界层的反射、中等雷诺数下绕平板的流动等。1956～1957年期间发表的5篇论文：绕平板和楔的高超声速流动、普朗特数和解离对高超声速流动的影响以及增补的5篇文章是作者在高超声速流动领域的研究成果以及他在回国后的学术报告和发表的文章，涉及现代空气动力学的发展方向、发射卫星和返地回收的科学和技术问题，体现了他在参与“两弹一星”技术领导工作中的学术思想。2 The flow of a compressible viscous fluid through a straight pipe.（可压缩黏性流体在直管中的流动1943年）
3 Two dimensional irrotational mixed subsonic and supersonic flow of a compressible fluid and the upper critical Mach number（可压缩流体二维无旋亚声速和超声速混合型流动及上临界马赫数1946年）
4 On the stability of transonic flows（论跨声速流的稳定性1947年）
5 The propagation of a spherical or a cylindrical wave of finite amplitude and the production of shock waves（有限振幅球面波或柱面波的传播及激波的产生1947年）
6 Two-dimensional irrotational transonic flows of a compressible fluid（可压缩流体二维无旋跨声速流动1948年）
7 On the hodograph method（关于速度图方法1949年）
8 Two-dimensional transonic flow past airfoils（绕翼型的二维跨声速流1951年）
9 On the stability of two-dimensional smooth transonic flows（论二元光滑跨声速流的稳定性1951年）
10 On the flow of an incompressible viscous fluid past a flat plate at moderate Reynolds numbers（中等雷诺数下不可压缩黏性流体绕平板的流动1953年）
11 Reflection of a weak shock wave from a boundary layer along a flat plate.I：Interaction of weak shock waves with laminar and turbulent boundary lavers analyzed by momentum-integral method（弱激波从沿平板的边界层的反射Ⅰ：用动量积分方法分析弱激波与层流和湍流边界层的相互作用1953年）
12 Reflection of weak shock wave from a boundary layer along a flat plate.Ⅱ：Interaction of oblique shock wave with a laminar boundary layer analyzed by differential-equation method（弱激波从沿平板的边界层的反射Ⅱ：用微分方程方法分析斜激波与层流边界层的相互作用1953年）
13 Plane subsonic and transonic potential flows（平面亚、跨音速势流1954年）
14 A similarity rule for the interaction between a conical field and a plane shock（锥型流和激波相互作用的相似律1955年）
15 Viscous flow along a flat plate moving at high supersonic speeds（沿高超声速运动平板的黏性流动【Ⅰ】1956年）
16 Viscous flow along a flat plate moving at high supersonic speeds（沿高超声速运动平板的黏性流动【Ⅱ】1956年）
17 The effects of Prandtl number on high-speed viscous flows over a flat plate（Prandtl数对绕平板高速黏性流的影响1956年）
18 Compressible viscous flow past a wedge moving at hypersonic speeds（楔的高超声速可压缩黏性绕流1956年）
19 Dissociation effects in hypersonic viscous flows（高超声速黏性流动中的离解效应1957年）
20 现代空气动力学的问题（1957年）
2l 在关于苏联发射成功第一颗人造卫星座谈会上的发言记录（1957年）
22 高超速钝体湍流传热问题（1963年）
23 宇宙飞船的回地问题（1965年）
24 激波的介绍
郭永怀生平
郭永怀传
Resumo:
The phylogenetic relationships within the genus Takifugu Abe, 1949 (Tetraodontiformes, Tetraodontidae) remain unresolved. Because of the use of Takifugu as model organisms, the resolution of these relationships is crucial for the interpretation of evolutionary trends in biology. Pufferfishes of this genus are comprised of a comparatively small number of species and are mainly distributed along the coastal region of the western part of the Sea of Japan and the coastline of China. Mitochondrial gene sequences were employed to test the phylogenetic hypotheses within the genus. Seventeen species of the genus were examined. Molecular phylogenetic trees were constructed using the maximum parsimony, neighbor-joining, maximum likelihood and Bayesian methods. Our hypothesis of internal relationships within the genus differs from previous hypotheses. Our results indicate that (1) the genus Takifugu is a monophyletic assemblage; (2) the genus is divided into 6 subgroups based on the molecular data; and (3) there is low genetic diversity among the species within this genus. In addition, speciation within Takifugu appears to be driven by hybridization and isolation by distribution. Our results also suggested that the taxonomy in the genus should be clarified based on both molecular and morphological data.
Resumo:
The phylogenetic relationship of 5 genera, i.e. Diplozoon Nordmann, 1832, Paradiplozoon Achmerov, 1974, Inustiatus Khotenovsky, 1978, Sindiplozoon Khotenovsky, 1981, and Eudiplozoon Khotenovsky, 1985 in the subfamily Diplozoinae Palombi, 1949 (Monogenea, Polyopisthocotylea) was inferred from rDNA ITS-2 region using neighbour-joining (NJ), maximum likelihood (ML) and Bayesian methods. The phylogenetic trees produced by using NJ, ML and Bayesian methods exhibit essentially the same topology. Surprisingly, freshwater species of Paradiplozoon from Europe clustered together with species of Diplozoon, but separated from Chinese Paradiplozoon species. The results of molecular phylogeny and lower level of divergence (4(.)1-15(.)7%) in ITS-2 rDNA among Paradiplozoon from Europe and Diplozoon and, on the other hand, high level of divergence (45(.)3-53(.)7%) among Paradiplozoon species from Europe and China might indicate the non-monophyletic origin of the genus Paradiplozoon. Also, the generic status of European Paradiplozoon needs to be revised. The species of Paradiplozoon in China is a basal group in Diplozoinae as revealed by NJ and Bayesian methods, and Sindiplozoon appears to be closely related to European Paradiplozoon and Diplozoon. with their relationship to Eudiplozoon and Inustiatus being unresolved.
