全文获取类型
收费全文 | 1989篇 |
免费 | 101篇 |
国内免费 | 23篇 |
专业分类
测绘学 | 89篇 |
大气科学 | 154篇 |
地球物理 | 719篇 |
地质学 | 711篇 |
海洋学 | 154篇 |
天文学 | 131篇 |
综合类 | 10篇 |
自然地理 | 145篇 |
出版年
2022年 | 12篇 |
2021年 | 22篇 |
2020年 | 52篇 |
2019年 | 34篇 |
2018年 | 60篇 |
2017年 | 51篇 |
2016年 | 81篇 |
2015年 | 74篇 |
2014年 | 70篇 |
2013年 | 123篇 |
2012年 | 91篇 |
2011年 | 120篇 |
2010年 | 102篇 |
2009年 | 124篇 |
2008年 | 102篇 |
2007年 | 72篇 |
2006年 | 68篇 |
2005年 | 45篇 |
2004年 | 45篇 |
2003年 | 51篇 |
2002年 | 32篇 |
2001年 | 52篇 |
2000年 | 32篇 |
1999年 | 37篇 |
1998年 | 31篇 |
1997年 | 31篇 |
1996年 | 25篇 |
1995年 | 20篇 |
1994年 | 19篇 |
1993年 | 13篇 |
1992年 | 19篇 |
1990年 | 14篇 |
1989年 | 14篇 |
1988年 | 21篇 |
1987年 | 13篇 |
1986年 | 22篇 |
1985年 | 23篇 |
1984年 | 19篇 |
1983年 | 27篇 |
1982年 | 22篇 |
1981年 | 19篇 |
1980年 | 17篇 |
1979年 | 20篇 |
1978年 | 13篇 |
1977年 | 15篇 |
1976年 | 14篇 |
1975年 | 17篇 |
1973年 | 15篇 |
1972年 | 10篇 |
1969年 | 9篇 |
排序方式: 共有2113条查询结果,搜索用时 125 毫秒
101.
102.
Jan Laštovička 《Studia Geophysica et Geodaetica》1994,38(2):206-212
Summary The nighttime LF radio wave absorption in the lower ionosphere measured at two frequencies in central Europe over 1963–1985
is used to infer planetary wave activity and its long-term trend in the upper middle atmosphere (∼90–100 km). The observed
positive trend is roughly consistent with results based on daytime absorption. Nighttime results are less pronounced and less
statistically significant probably due to perturbing effects of geomagnetic activity. The observed trends, which are probably
of anthropogenic origin, are together with the daytime results [3,4] the first evidence of long-term trends in planetary wave
activity in the upper middle atmosphere. 相似文献
103.
104.
105.
Summary The paper deals with a non-linear regression model, linear in parameters. The least-squares adaptation method has been used
to determine the model parameters. The conditionality problem in solving equations, which follows from the dependent predictors,
has been suppressed by singular decomposition. This model is especially suitable for treating meteorological problems because
non-linear processes, e.g. changes of air masses, changes of circulation patterns, etc., can be treated. The model has been
tested in connection with the forecast of daily maximum and minimum temperatures. The RMS error lies in the range of 1–2°C,
if the principal PPM is supposed.
Резюме Оnuсывеamся мamемamuческuŭ annaрam нелuнеŭноŭ ре?rt;рессuонноŭ мо?rt;елu, лuнеŭноŭ оmнос umельно naрaмеmров. Для оnре?rt;еленuя naрaмеmров мо?rt;елu uсnользуеmся меmо?rt; нauменьщuх квa?rt;рamов. Плохaя обусловленносmь сuсmемы нauменьщuх квa?rt;рamов, коmорaя вызвaнa взauмноŭ зaвuсuмосmью nре?rt;uкmоров, всmрaняеmся nрu nомощu сuн?rt;улярноŭ ?rt;екомnозuцuu. Эma мо?rt;ель nо?rt;хо?rt;um ?rt;ля nрuмененuя в меmеороло?rt;uu, maк кaк онa nозволяеm рaбоmamь с нелuнеŭносmямu, кaк нanрuмер uзмененuе воз?rt;ущных мaсс, uзмененuе хaрaкmерa цuркуляцuu u m. n. Мо?rt;ель nроверяеmся нa nро?rt;нозе ?rt;невных мuнuмaльных u мaксuмaльных mемnерamур. Сре?rt;няя квa?rt;рamuческaя ошuбкa нaхо?rt;umся в uнmе?rt;рaле оm 1 ?rt;о 2° (uсnользовaн nрuнцun РРМ).相似文献
106.
The rate of compositional and isotopic exchange between minerals may be enhanced significantly if the rock is deformed simultaneously.
The enhanced exchange rate may result from a reduction in grain size (shorter distance for volume diffusion), dissolution
and growth of grains by diffusion creep (pressure solution), or the movement of high-angle grain boundaries through strained
grains during recrystallization in the dislocation creep regime. The migration of high-angle grain boundaries provides high
diffusivity paths for the rapid exchange of components during recrystallization. The operation of the latter process has been
demonstrated by deforming aggregates consisting of two plagioclases (An1 and An79) at 900°C, 1 GPa confining pressure, and a strain rate of ∼2x10-6s-1. The polygonal, recrystallized grains were analyzed using an analytical transmission electron microscope and have a variable
but often intermediate composition. At the conditions of these experiments, the volume interdiffusion rate of NaSi/CaAl is
too slow to produce any observable chemical change, and microstructural-chemical relations indicate that the contribution
from diffusion creep was insignificant except for initially fine-grained (2–10 μm) aggregates. These results indicate that
strain-induced recrystallization can be an effective mechanism for enhancing the kinetics of metamorphic reactions and for
resetting the isotope systematics of minerals such as feldspars, pyroxenes, and amphiboles. 相似文献
107.
Summary On the basis of the 1966–73 data, the effect of the difference between pro- and anti-sectors of the IMF is found to be negligible in the winter midlatitude (Central Europe) ionosphere contrary to the dominant effect of this difference in the high-latitude ionosphere found earlier.
a ¶rt;a a 1966–73. u¶rt;m u m amu ¶rt; pro- u anti- mau . na a u ¶rt;um (¶rt; na) u, , a naa a, naum um u.相似文献
108.
Petroleum hydrocarbons in the sediments of the Bothnian Bay, Baltic proper, Öresund, Kattegatt and Skagerrak were analysed in a survey of oil pollution along the Swedish coast in 1974 and 1975. Sixty-one of these sediment stations were revisited in 1982 and analysed with the methods used in the first survey. The mean content of petroleum hydrocarbons (paraffin-naphthene fraction) in the sediment surface showed a statistically significant increase from 199 to 252 μg g?1 dry wt. The main increase had taken place in the coastal areas. Within 0–20 km distance of urbanized areas (>20 000 inhabitants) petroleum hydrocarbons had increased from 371 to 447 μg g?1. Sediment levels increased from 76 to 117 μg g?1, 20–50 km from urbanized areas. The increase in these areas was equivalent to 0.119 g m?2 yr?1. 相似文献
109.
John W. Morgan Marie-Josée Janssens H. Takahashi Jan Hertogen Edward Anders 《Geochimica et cosmochimica acta》1985,49(1):247-259
We have analyzed 10 H-chondrites for 20 trace elements, using RNAA. The meteorites included 4 of petrologic type 4 and 2 each of types 3, 5 and 6.The data show that H-chondrites are not isochemical. H3's are depleted by some 10% not only in Fe (Dodd, 1976), but also in the siderophiles Os, Re, Ir, Ni, Pd, Au, and Ge. Moreover, the abundance pattern of siderophiles varies systematically with petrologic type. As similar fractionations of REE have been observed by Nakamura (1974), it appears that both the proportions and compositions of the main nebular condensates varied slightly during accretion of the H-chondrites. Thus the higher petrologic types are independent nebular products, not metamorphosed descendants of lower petrologic types.Abundances of highly volatile elements (Cs, Br, Bi, Tl, In, Cd, Ar36) correlate with petrologic type, declining by ≤ 10?3 from Type 3 to Type 6. The trends differ from those for artificially heated Type 3's (Ikramuddinet al., 1977b; Herzoget al., 1979), but agree passably with theoretical curves for nebular condensation. Apparently the low volatile contents of higher petrologic types are a primary feature, not the result of metamorphic loss.The mineralogy of chondrites suggests that they accreted between 405 K (absence of Fe3O4) and 560 K (presence of FeS), and the abundances of Tl, Bi, and In further restrict this interval to 420–500 K. Accretion at 1070 ± 100 K, as proposed by Hutchisonet al. (1979, 1980), leads to some extraordinary problems. Volatiles must be injected into the parent body after cooling, which requires permeation of the body by 1011 times its volume of nebular gas. This process must also achieve a uniform distribution of the less volatile elements (Rb, Cu, Ag, Zn, Ga, Ge, Sn, Sb, Se, F), without freezeout in the colder outer layers.Factor analysis of our data shows 3 groupings: siderophiles (Os, Re, Ir, Ni, Pd, Au, and Ge), volatiles (Ag, Br, In, Cd, Bi, and Tl) and alkalis (Rb and Cs). The remaining 5 elements (U, Zn, Te, Se, and Sb) remain unassociated. 相似文献
110.
Some ilmenite concentrates obtained from oleate flotation of ilmenite ores from NE Poland contain less than the required 45% TiO2 due to the presence of green spinels (hercynite and pleonaste). Such concentrates were further upgraded by different separation techniques. It was established at microlaboratory scale that magnetic, gravity and high-tension separations can provide qualified ilmenite concentrates with TiO2 recovery in the order of 50 to 80%. 相似文献