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141.
This paper analyzes the composition and distribution of coastal phytoplankton in the western portion of the Middle Caspian
in the context of changes in the hydrological and hydrochemical regime under the conditions of the rising level of the Caspian
Sea. It has been demonstrated that the changes in the water regime led to an increase in the taxonomic diversity, the quantitative
characteristics of phytoplankton, and the succession of the size groups. 相似文献
142.
Doklady Earth Sciences - 相似文献
143.
A. Z. Shvidenko D. G. Shchepashchenko E. A. Vaganov A. I. Sukhinin Sh. Sh. Maksyutov I. McCallum I. P. Lakyda 《Doklady Earth Sciences》2011,441(2):1678-1682
Verified estimates of wildfire area and related carbon emissions in territories of Russia are reported for the period of 1998–2010.
It is shown that the average burnt area is estimated to be at 8.23 million hectares per year (uncertainty ±9.0%, confidence
interval 0.9), and carbon emissions—121 Tg C yr−1 (±23%), with a significant interannual variability of these indicators. A quantitative characteristic of fire emissions by
species is reported. Forests are a source of three quarters of all carbon emissions caused by wildfires. A significant acceleration
of fire regimes is expected during the 21st century as a result of climate change in the country. 相似文献
144.
长牡蛎繁殖周期、生化成分的季节变化与环境因子的关系 总被引:4,自引:0,他引:4
为了阐明长牡蛎的繁殖策略,自2004年3月—2005年2月对乳山湾养殖海区的环境因子(水温、盐度、叶绿素a含量)、长牡蛎繁殖周期及其生化成分(糖原、脂肪、蛋白质、RNA/DNA比值)的季节变化进行研究。结果显示,水温在一年中呈现显著变化,夏季水温最高,最高值为29.5℃(8月),冬季水温最低,最低值为1.8℃(1月);盐度在夏季雨水较多的时候略有降低;叶绿素a含量在夏末秋初(8月和9月)和春季(4月)有2个峰值,冬季最低。长牡蛎的繁殖周期分为冬季的休止期和从春季到夏季的繁殖期,在长牡蛎的繁殖期,条件指数逐渐下降到最低值,表明繁殖期长牡蛎生长变慢。在长牡蛎的配子发生过程中软体部蛋白质和脂肪含量略有上升,而糖原含量显著下降,表明长牡蛎配子的发生需要储存的糖原提供能量;RNA/DNA比值在配子发生过程中逐渐升高,显示RNA/DNA比值可以作为一个指标来指示长牡蛎的性成熟。配子发生过程中,长牡蛎的灰分含量逐渐升高,表明长牡蛎通过分解自身的贮能物质提供能量,使体内有机物含量减少,从而导致灰分含量上升。实验结果表明长牡蛎的配子发生类型为保守种。 相似文献
145.
Sh. Hosseini Hashemi Mahmoud Karimi H. Rokni Damavandi Taher 《Ocean Engineering》2010,37(2-3):174-185
In this study Free vibration analysis of vertical rectangular Mindlin plates resting on Pasternak elastic foundation and fully or partially in contact with fluid on their one side is investigated for different combinations of boundary conditions. The plate is assumed to be one of vertical rectangular walls of a container in contact with fluid. In order to analyze the interaction of the Mindlin plate with the elastic foundation and fluid system, three displacement components of the plate are expressed in the Ritz method by adopting a set of static Timoshenko beam functions satisfying geometric boundary conditions in a Cartesian co-ordinate system. The method of separation of variables and the method of Fourier series expansion is used to model fluid and to obtain the exact expression of the motion of fluid in the form of integral equations. The fluid domain is finite in depth and width but infinite in the length direction. To demonstrate the accuracy of the present solution, convergence study is first carried out and then a few comparison studies are carried out with the available data in the literature. Finally, natural frequencies of rectangular plates are presented in tabular and graphical forms for different fluid levels, foundation parameters, aspect ratios, thickness to width ratios and boundary conditions. 相似文献
146.
本文通过武育粳3号的播期试验研究,利用生育期的试验资料,结合本地的温光资源,建立其温光模式,从中分析该品种有感温性强,感光性弱的特性,在本地区应采用稀播长秧龄等配套措施,确保在安全齐穗期内齐穗,达到高产的目的。 相似文献
147.
Institute of Applied Physics Problems, Armenian Academy of Sciences. Translated from Astrofizika, Vol. 32, No. 3, pp. 491–500, May–June, 1990. 相似文献
148.
149.
150.
The Ca+ K line of the quiescent prominence of 15 October 1969 observed at the Abastumani Astrophysical Observatory of the Academy of Sciences of Georgia, U.S.S.R. is studied in detail. The behaviour of various fragments of the prominence with the line-of-sight Doppler velocities is investigated for different places of the prominence along the spectrum height. Due to superposition of the fragments and the radial velocities a complex non-gaussian profile of the spectral line is formed. Decomposition of the non-gaussian profile into suitable gaussian ones is made with a computer yielding objectivity and high accuracy. The rms error for the intensities in the decomposition is about 5%.It is found that the components into which the Ca+ K line decomposes at each level, are traced while proceeding from one photometric section to another throughout the spectral height.A hypothesis on the preferably filamentary structure of the prominence is put forward. 相似文献