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91.
H. Philipp 《International Journal of Earth Sciences》1936,27(1):89-90
Ohne Zusammenfassung 相似文献
92.
Controls on erosion patterns and sediment transport in a monsoonal,tectonically quiescent drainage,Song Gianh,central Vietnam 下载免费PDF全文
Tara N. Jonell Peter D. Clift Long V. Hoang Tina Hoang Andrew Carter Hella Wittmann Philipp Böning Katharina Pahnke Tammy Rittenour 《Basin Research》2017,29(Z1):659-683
The Song Gianh is a small‐sized (~3500 km2), monsoon‐dominated river in northern central Vietnam that can be used to understand how topography and climate control continental erosion. We present major element concentrations, together with Sr and Nd isotopic compositions, of siliciclastic bulk sediments to define sediment provenance and chemical weathering intensity. These data indicate preferential sediment generation in the steep, wetter upper reaches of the Song Gianh. In contrast, detrital zircon U‐Pb ages argue for significant flux from the drier, northern Rao Tro tributary. We propose that this mismatch represents disequilibrium in basin erosion patterns driven by changing monsoon strength and the onset of agriculture across the region. Detrital apatite fission track and 10Be data from modern sediment support slowing of regional bedrock exhumation rates through the Cenozoic. If the Song Gianh is representative of coastal Vietnam then the coastal mountains may have produced around 132 000–158 000 km3 of the sediment now preserved in the Song Hong‐Yinggehai Basin (17–21% of the total), the primary depocenter of the Red River. This flux does not negate the need for drainage capture in the Red River to explain the large Cenozoic sediment volumes in that basin but does partly account for the discrepancy between preserved and eroded sediment volumes. OSL ages from terraces cluster in the Early Holocene (7.4–8.5 ka), Pre‐Industrial (550–320 year BP) and in the recent past (ca. 150 year BP). The older terraces reflect high sediment production driven by a strong monsoon, whereas the younger are the product of anthropogenic impact on the landscape caused by farming. Modern river sediment is consistently more weathered than terrace sediment consistent with reworking of old weathered soils by agricultural disruption. 相似文献
93.
94.
Effects of dietary exposure to the pyrethroid pesticide esfenvalerate on medaka (Oryzias latipes) 总被引:3,自引:0,他引:3
Werner I Geist J Okihiro M Rosenkranz P Hinton DE 《Marine environmental research》2002,54(3-5):609-614
The pyrethroid insecticide esfenvalerate is widely used on orchard crops throughout California. In the aquatic environment, this compound is likely to accumulate in sediments, food particles and benthic organisms due to its lipophilicity and environmental persistence. This pilot project tested the hypothesis that esfenvalerate is toxic to medaka (Oryzias latipes) when taken up with the diet. For 7 days fish were fed diets, which contained esfenvalerate in three different concentrations (4, 21, 148 mg/kg, measured). Endpoints measured were mortality, fecundity, fertilization and hatching success of embryos, viability of larvae and cellular stress protein (hsp60, hsp70, hsp90) levels. The toxicity of aqueous exposure of medaka to esfenvalerate was also determined. Whereas the 96-h LC50 in the aqueous exposure was <9.4 microg/l, the dietary exposure did not cause mortality. Possible effects of dietary esfenvalerate were seen on fertilization and hatching success and the number of non-viable larvae. Expression of hsp60 and hsp90 showed a dose-dependent response pattern. 相似文献
95.
Manfred Burianek Johannes Birkenstock Philipp Mair Volker Kahlenberg Olaf Medenbach Robert D. Shannon Reinhard X. Fischer 《Physics and Chemistry of Minerals》2016,43(7):527-534
Single crystals of B2O3 are needed for the precise determination of the refractive indices used to calculate the electronic polarizability α of 3-coordinated boron. The α(B) values in turn are used to predict mean refractive indices of borate minerals. Since the contribution of boron to the total polarizability of a mineral is very low, the synthetic compound B2O3 represents an ideal model system because of its high molar content of boron. Millimeter-sized crystals were synthesized at 1 GPa in a piston-cylinder apparatus. The samples were heated above the liquidus (800 °C), subsequently cooled at 15 °C/h to 500 °C and finally quenched. The refractive indices were determined by the immersion method using a microrefractometer spindle stage. The refractive indices n o = 1.653 (3) and n e = 1.632 (3) correspond to a total polarizability for B2O3 of α = 4.877 Å3. These values were used to determine the electronic polarizability of boron of α(B) = 0.16 Å3. Although the surface of the B2O3 crystals was coated with a hydrous film immediately after being exposed to air, its bulk crystallinity is retained for a period of at least 2 months. 相似文献
96.
Natural hazards in Nordic Countries 总被引:1,自引:0,他引:1
Farrokh Nadim Stig AsbjФrn Schack Pedersen Philipp Schmidt-Thome Freysteinn Sigmundsson Mats Engdahl 《《幕》》2008,31(1):176-184
Compared to many areas of the world, the human losses caused by natural hazards are smaller in Nordic countries. This is mainly due to the low population density in the exposed areas. However, the economic losses are significant and the geohazards picture varies among the countries. The predominant natural hazards in Nordic countries are floods, landslides, and, with the exception of Denmark, snow avalanche. Volcanoes and earthquakes are major geohazards in Iceland, and parts of Norway are susceptible to seismic activity. Slidetriggered tsunamis also represent a threat to parts of the coastal areas of Nordic countries and Greenland. 相似文献
97.
Philipp Bluszcz Emiliya Kirilova André F. Lotter Christian Ohlendorf Bernd Zolitschka 《Aquatic Geochemistry》2008,14(1):73-98
A 2-year (October 2003–October 2005) high-resolution sediment trap study was conducted in Sacrower See, a dimictic hardwater
lake in northeastern Germany. Geochemical and diatom data from sediment trap samples were compared with a broad range of limnological
and meteorological parameters to quantify the impact of single parameters on biochemical calcite precipitation and organic
matter production. Our goals were to disentangle how carbonaceous varves and their sublaminae form during the annual cycle
to better understand the palaeorecords and to detect influences of dissolution, resuspension as well as of global radiation
and stratification on lake internal particle formation. Total particle fluxes in both investigated years were highest during
spring and summer. Sedimentation was dominated by autochthonous organic matter and biochemically precipitated calcite. Main
calcite precipitation occurred between April and July and was preceded and followed by smaller flux peaks caused by resuspension
during winter and blooms of the calcified green algae Phacotus lenticularis during summer. In some of the trap intervals during summer up to 100% of the precipitated calcite was dissolved in the hypolimnion.
High primary production due to stable insolation conditions in epilimnic waters began with stratification of the water column.
Start and development of stratification is closely related to air and water surface temperatures. It is assumed that global
radiation influences the onset and stability of water column stratification and thereby determining the intensity of primary
production and consequently of timing and amount of calcite precipitation which is triggered by phytoplanktonic CO2 consumption. Sediment fluxes of organic matter and calcite are also related to the winter NAO-Index. Therefore these fluxes
will be used as a proxy for ongoing reconstruction of Holocene climate conditions. 相似文献
98.
99.
Landslide impacts on infrastructure and society in the Federal Republic of Germany are associated with damage costs of about US$300 million on annual average. Despite the large overall losses due to widespread landslide activity, there is a lack of historical impact assessments, not just for Germany’s low mountain areas but those of entire Central Europe as well. This paper is a collection of three case studies from Germany that seek a better understanding of landslide impacts and their economic relevance at local and regional level. The first case study investigates damage types and mitigation measures at a representative landslide site in ways that support to gain insight into historical hazard interactions with land use practices. This case history is followed by a case study dealing with fiscal cost impacts of landslide damages for an example city and the highway system of the Lower Saxon Uplands, NW Germany. In addition to a cost-burden analysis for affected public budgets, an overview of the principles of disaster financing in landslide practice is given. The third case study is focused on the conflicts of urban development in hazard areas, with an economic approach to balancing safety and public welfare interests. Each case study is based on historical data sets extracted from Germany’s national landslide database. This paper presents three different case studies that in combination are a first step towards assessing landslide impacts in integrated perspective. 相似文献
100.
The false Basel earthquake of May 12, 1021 总被引:1,自引:0,他引:1
Gabriela Schwarz-Zanetti Virgilio Masciadri Donat Fäh Philipp Kästli 《Journal of Seismology》2008,12(1):125-129
The Basel (CH) area is a place with an increased seismic hazard. Consequently, it is essential to scrutinize a famous statement by Stumpf (Gemeiner loblicher Eydgnoschafft Stetten, Landen und Völckeren Chronikwirdiger thaaten beschreybung. Durch Johann Stumpffen beschriben, 1548) that allegedly a large earthquake took place in Basel in 1021. This can be disproved unambiguously by applying historical and philosophical methods. 相似文献