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51.
马绯璠 《西安航空技术高等专科学校学报》2010,28(2)
自19世纪以来中国诗歌的英译对美国诗歌产生了重大影响,但美国本土诗歌和文化思想仍然处于强势的主导地位,美国人接受的是他们心目中的中国文化。美国诗歌对中国文化和中国诗歌的吸收,并不等于东西文化的交流与结合。通过研究中美文化和文学交流的媒介,结合多元系统论和比较文学相关理论来对该问题进行分析。 相似文献
52.
Ingrid Mann 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(1):160-167
The average mass of dust per volume in space equals that of the solar wind so that the interplanetary medium should provide an obvious region to study dust plasma interactions. While dust collective behavior is typically not observed in the interplanetary medium, the dust component rather consists of isolated grains screened by and interacting with the plasma. Space measurements have revealed several phenomena possibly resulting from dust plasma interactions, but most of the dust plasma interactions are at present not quantified. Examples are the production of neutrals and pick-up ions from the dust, dust impact generated field variations at spacecraft and magnetic field variations possibly caused by solar wind interacting with dust trails. Since dust particles carry a surface charge, they are exposed to the Lorentz force in the interplanetary magnetic field and for grains of sub-micrometer sizes acceleration can be substantial. 相似文献
53.
K. Scherer H. Fichtner B. Heber S.E.S. Ferreira M.S. Potgieter 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(8):1171-1176
In recent years the variability of the cosmic ray flux has become one of the main issues not only for the interpretation of the abundances of cosmogenic isotopes in cosmochronic archives like, e.g., ice cores, but also for its potential impact on the terrestrial climate. It has been re-emphasized that the cosmic ray flux is not only varying due to the solar activity-induced changes of the solar wind but also in response to the changing state of the interstellar medium surrounding the heliosphere. We demonstrate the significance of these external boundary condition changes along the galactic orbit of the Sun for the flux as well as spectra of cosmic rays. Such interstellar–terrestrial relations are a major topic of the International Heliophysical Year 2007. 相似文献
54.
Nikolai V. Pogorelov Gary P. Zank Tatsuki Ogino 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(2):306-317
An overview is presented of magnetic-field-related effects in the solar wind (SW) interaction with the local interstellar medium (LISM) and the different theoretical approaches used in their investigation. We discuss the possibility that the interstellar magnetic field (ISMF) introduces north–south and east–west asymmetries of the heliosphere, which might explain observational data obtained by the Voyager 1 and Voyager 2 spacecraft. The SW–LISM interaction parameters that are responsible for the deflection of the interstellar neutral hydrogen flow from the direction of propagation of neutral helium in the inner heliosheath are outlined. The possibility of a strong ISMF, which increases the heliospheric asymmetry and the H–He flow deflection, is discussed. The effect of the combination of a slow-fast solar wind during solar minimum over the Sun’s 11-year activity cycle is illustrated. The consequences of a tilt between the Sun’s magnetic and rotational axes are analyzed. Band-like areas of an increased magnetic field distribution in the outer heliosheath are sought in order to discover regions of possible 2–3 kHz radio emission. 相似文献
55.
中小企业技术创新的优势与劣势分析 总被引:2,自引:0,他引:2
中小企业在技术创新活动中具有自己的优势,但同时也伴有更为突出的劣势,从而造成许多中小企业生命周期过短的现象。文章分析了中小企业技术创新的优势和劣势,针对劣势提出了技术创新的若干对策。 相似文献
56.
尹振吉 《民用飞机设计与研究》2019,(2):59-63
压力分布传感器逐步被应用到飞行载荷测量,传感器可靠安装是测量的前提。该文对压力分布传感器安装位置气动环境进行了计算分析,在传感器安装气动环境明确的条件下,通过粘贴介质剥离试验,选择合适的粘接材料,研究形成粘接工序,通过计算和飞行试验验证了粘接工序合理、粘接工艺可靠。 相似文献
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