全文获取类型
收费全文 | 56篇 |
免费 | 2篇 |
专业分类
大气科学 | 21篇 |
地球物理 | 12篇 |
地质学 | 18篇 |
海洋学 | 4篇 |
天文学 | 1篇 |
自然地理 | 2篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2017年 | 1篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 3篇 |
2012年 | 1篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 6篇 |
2000年 | 5篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1985年 | 1篇 |
1978年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有58条查询结果,搜索用时 15 毫秒
11.
12.
13.
14.
Stephan Mertes Alfons Schwarzenbck Paolo Laj Wolfram Wobrock Jean-Marc Pichon Giordano Orsi Jost Heintzenberg 《Atmospheric Research》2001,58(4)
A ground-based seeding experiment using carbon dioxide and propane sprayed from pressurized bottles was carried out under supercooled cloud conditions on a small spatial and short time scale. Water vapor deposition on the artificially generated dry ice and propane ice germs as the main ice formation process (nucleation and growth) is consistent with the experimental results. After nucleation, diffusional growth of the ice particles, partly at the expense of evaporating small droplets, was identified during the mixing of the seeding line with the ambient supercooled cloud. Within the seeding plume, ice water contents up to 80% of the total condensed water are observed, although the size of the formed ice particles did not exceed 25 μm. From the changes of the ice and supercooled liquid phase with time under mixed-phase conditions, liquid water content (LWC) evaporation, ice water content (IWC) formation, and ice crystal growth rates are estimated, which are not affected by the artificial nucleation process. Thus, these rates are assessed to be applicable for a growing ice phase of small ice particles in a young mixed-phase cloud, where other growth mechanisms, like riming or aggregation, are negligible. 相似文献
15.
Consideration of sources and growth dynamics of aerosols has led to the conclusion that there may be a distribution or variation of chemical composition and physical structure among atmospheric aerosol particles as a function of size, and within a narrow size range as well. A mathematical representation of these particle properties in terms of an additional dimension to the number size distribution is described. Examples of the relevance of this aspect of aerosol characterization for physical and chemical processes in the atmosphere are discussed. A review of the available techniques shows that several methods are available which can and have provided quantitative results on the distribution of particle properties. Examples of data from the literature have been selected and are presented as three-dimensional distributions illustrating the wide range of particle properties which may exist in narrow size intervals. An evaluation of these results reiterates the value of taking the distribution of particle properties in the atmosphere into account for sampling and modeling purposes. 相似文献
16.
17.
This paper describes an effort to develop a predictive tool for the design of a new promising marine transport — the WIG craft. The presented mathematical model of the WIG craft is capable of modeling the aerodynamics of a WIG system including the ground effect, the hydrodynamics of a stepped planing hull with a hydrofoil and also the simulation of motion for the craft. Based on extensive experience using the model, it is shown that the most important and necessary features of WIG aero- and hydrodynamics are taken into account. The results of simulations have been validated through comparison with other theoretical approaches and also with model experiments. The mathematical model is applied to investigate the dynamics of the small manually piloted WIG craft: “Hydrowing VT01”. The numerical study resulted in recommendations allowing the pilot to overcome the pitch-up tendency and also to perform the take-off manoeuvre smoothly. The stability of the WIG with a hydrofoil and also the dynamic properties of anti-collision manoeuvres have been studied and are presented. 相似文献
18.
19.
A new all-solid-state electronic circuit for Dobson instruments will be presented, including a self-balancing system and digital readout. 相似文献
20.
Dieter Jost 《Pure and Applied Geophysics》1971,86(1):209-218
Zusammenfassung Zwischen 50° bis 85°N Breite wurde die atmosphärische CO2-Konzentration während mehrerer Messflüge registriert. Diese war oberhalb der Tropopause bis zu 7 ppm (im Mittel etwa 2 ppm) niedriger als in der oberen Troposphäre. Im Jahresmittel entspricht diese CO2-Konzentrationsdifferenz einem Fluss von etwa 10–2 g CO2/cm2 Jahr aus der nördlichen Troposphäre in die Stratosphäre. Die Bedeutung dieser CO2-Konzentrationsunterschiede für den atmosphärischen CO2-Haushalt sowie für die Strahlungsbilanz im Tropopausenniveau kann erst nach Vorlage weiterer, über das ganze Jahr verteilter Messdaten erfolgen.
Summary CO2-concentration was measured during several flights in northern latitudes (50°–85°). Above Tropopause CO2-concentration was up to 7 ppm (as a mean some 2 ppm) smaller than in upper troposphere. As a mean this difference in CO2-concentration cm2 year conforms to a CO2-flux of some 10–2 g CO2/cm2 year from northern troposphere into stratosphere. The importance of these CO2-differences for atmospheric CO2-system and for radiation balance in tropopause-height may be considered as soon as more CO2-concentration data for the whole year are available.相似文献