全文获取类型
收费全文 | 129篇 |
免费 | 0篇 |
专业分类
测绘学 | 1篇 |
大气科学 | 44篇 |
地球物理 | 24篇 |
地质学 | 29篇 |
海洋学 | 9篇 |
天文学 | 12篇 |
自然地理 | 10篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 9篇 |
2017年 | 9篇 |
2016年 | 11篇 |
2015年 | 4篇 |
2014年 | 3篇 |
2013年 | 8篇 |
2012年 | 5篇 |
2011年 | 11篇 |
2010年 | 12篇 |
2009年 | 16篇 |
2008年 | 9篇 |
2007年 | 5篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有129条查询结果,搜索用时 15 毫秒
21.
22.
Characterization of the proteinaceous matter in marine aerosols 总被引:1,自引:0,他引:1
Marine aerosols play a dominant role in the transfer of oceanic material to the atmosphere. Most marine aerosol originates when air bubbles burst at the sea surface ejecting material from the sea surface microlayer and bubble surface layers into the air. Concentrations of chemical compounds in these surface layers often differ from their concentrations in bulk water. We examined the enrichment of aerosols with proteinaceous matter and attempted to characterize the physical nature and sources of this matter. We measured concentrations of dissolved free (DFAA), dissolved combined (DCAA), and particulate (PAA) amino acids, transparent stainable particles (TSP), and bacteria and virus-like particles as carriers of protein, in natural and simulated aerosols. We also evaluated D/L ratios certain amino acids in all amino acid fractions.DFAA and DCAA enriched the aerosols we sampled by 1.2–20 times compared to bulk seawater; PAA enrichment was usually higher (up to 50-fold). Aerosols contained particles typical of seawater, e.g., microorganisms, organic debris, inorganic particles with adsorbed organic matter, but also a large number of semitransparent gel-like particles, which all contained amino acids. Some of these particles were probably scavenged from bulk water, but new particles produced as bubbles burst at the surface comprised at least 10% of total proteinaceous matter in the aerosol. D/L ratios of certain amino acid suggested that the particles were most likely made from dissolved polymers secreted by phytoplankton that were concentrated on bubble surfaces and in the microlayer. Examination with Alcian Blue (a dye that targets carbohydrates) and Coomassie Blue (a dye that targets proteins) showed that most TSP in the aerosols contained both proteins and polysaccharides. Microorganisms enriched the aerosols by up to two orders of magnitude, but contributed less than 4% to the total protein pool. 相似文献
23.
This paper analyzes the time changes of the common oscillations of the spectra of the absolute value of the interplanetary magnetic field measured at the Earth’s orbit from 1964 to 1997 and of solar activity (the Wolf sunspot numbers). The frequency components of the spectra were determined using the method of nonlinear spectral analysis. Oscillations with common periods of T = 10.8, T = 8.8, and T = 3.73 years have been identified in the long-period part of the spectra, and their temporal variations are shown. We discuss the specific features of the spectral band in the short-period part of the spectra in the vicinity of the known periods of T ~ 1.3 years and T ~ 150 days that have been identified earlier in the solar data and in the solar wind parameters. 相似文献
24.
25.
A. M. Zvyagintsev N. S. Ivanova G. M. Kruchenitskii I. N. Kuznetsova E. A. Lezina 《Russian Meteorology and Hydrology》2008,33(2):130-134
The review is compiled based on the results of the operational of the Total Ozone (TO) Monitoring System in the CIS and Baltic countries, functioning in the operational regime at the Central Aerological Observatory (CAO). Basic TO observational data for each month of the fourth quarter of 2007 and for the year as a whole are summarized. Long-term TO changes at Russian stations are compared with similar changes at two foreign stations in the temperate latitudes of the Northern Hemisphere. Data on the spring Antarctic ozone anomaly of 2007 are considered. Results of regular observations of surface ozone concentration in the Moscow region are also presented. 相似文献
26.
A. M. Zvyagintsev N. S. Ivanova G. M. Kruchenitskii I. N. Kuznetsova E. A. Lezina Ya. O. Romanyuk 《Russian Meteorology and Hydrology》2009,34(3):187-193
Areview is compiled based on the results of the system of monitoring total ozone (TO) over the CIS and Baltic countries that is operated in real time at the Central Aerological Observatory (CAO). The TO monitoring system uses the data from the national M-124 filter ozonometer network operated under the methodological guidance of the Main Geophysical Observatory. The performance of the system as a whole is operationally verified against the OMI satellite (US NASA) observations. The main TO observational data are summarized for each month of the fourth quarter of 2008, for a quarter, and a year as a whole. Data on the Spring Antarctic Ozone Anomaly in 2008 are presented. Results of regular surface ozone observations in the Moscow region and in Kiev are also considered. 相似文献
27.
M. N. Khaikine I. N. Kuznetsova E. N. Kadygrov E. A. Miller 《Theoretical and Applied Climatology》2006,84(1-3):161-169
Summary Quantitative measurements of the impact of an urban environment on the thermal state of the atmospheric boundary layer are
presented. Temperature profiles up to the height of 600 m were obtained in a continuous series of measurements by three microwave
profilers MTP-5 located in different areas of Moscow. The influence of this large city on urban heat island (UHI) parameters
was estimated on occasions with stationary atmospheric processes and during cases with frontal passage. Two types of UHI were
identified: one with a dome of urban warmth at all levels, and another with a low warm dome in combination with a lens of
cold air above. 相似文献
28.
V. S. Beskin I. V. Kuznetsova & R. R. Rafikov 《Monthly notices of the Royal Astronomical Society》1998,299(2):341-348
The stationary axisymmetric outflow from a rotating sphere with a (split) monopole magnetic field is considered. The stream equation describing the outflow is linearized in terms of the Michel magnetization parameter σ−1 ≪ 1, which allows a self-consistent analysis of the direct problem. It is shown that for a finite σ the fast magnetosonic surface is located at a finite distance ∼ σ1/3 R L ( R L = c /ΩF is the light cylinder). We have also found that the particle energy at the fast surface is just equal to the Michel value γ ∼ 1/3σ. The particle acceleration and magnetic field collimation are shown to become ineffective outside the fast magnetosonic surface. 相似文献
29.
Oksana A. Tarasova Nicolai F. Elansky Gennady I. Kuznetsov Irina N. Kuznetsova Irina A. Senik 《Journal of Atmospheric Chemistry》2003,45(3):245-259
The impact of air transport on the surface ozone variations is analyzed at Kislovodsk High Mountain Station for the period 1989–1996 on the basis of 2D back trajectories. It was shown that the contribution of photochemical and dynamical processes is different for the different seasons. In summer months the surface ozone concentration is governed by photochemical ozone production in semi polluted air from the regions of Northern Caspian, Southern Ural and Volga region. Time of the seasonal ozone maximum appearance is defined by joint influence of the processes of photochemical production and destruction in the eastern sectors and advection from Ukraine and Central Europe. The value of the seasonal minimum is determined by the processes of ozone destruction in the air coming from northeastern direction in the stable frontal zone. Distribution of sectors of the air transport changes from year to year and it can partly explain strong negative trend of the surface ozone concentration at the site. 相似文献
30.