全文获取类型
收费全文 | 59篇 |
免费 | 2篇 |
专业分类
测绘学 | 9篇 |
大气科学 | 15篇 |
地球物理 | 4篇 |
地质学 | 15篇 |
海洋学 | 4篇 |
天文学 | 12篇 |
自然地理 | 2篇 |
出版年
2022年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2008年 | 6篇 |
2007年 | 1篇 |
2006年 | 5篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1984年 | 2篇 |
排序方式: 共有61条查询结果,搜索用时 15 毫秒
31.
Rahul Ramachandran Manil Maskey Ajinkya Kulkarni Helen Conover U. S. Nair Sunil Movva 《Earth Science Informatics》2012,5(1):33-41
“Open science,” where researchers share and publish every element of their research process in addition to the final results,
can foster novel ways of collaboration among researchers and has the potential to spontaneously create new virtual research
collaborations. Based on scientific interest, these new virtual research collaborations can cut across traditional boundaries
such as institutions and organizations. Advances in technology allow for software tools that can be used by different research
groups and institutions to build and support virtual collaborations and infuse open science. This paper describes Talkoot,
a software toolkit designed and developed by the authors to provide Earth Science researchers a ready-to-use knowledge management
environment and an online platform for collaboration. Talkoot allows Earth Science researchers a means to systematically gather,
tag and share their data, analysis workflows and research notes. These Talkoot features are designed to foster rapid knowledge
sharing within a virtual community. Talkoot can be utilized by small to medium sized groups and research centers, as well
as large enterprises such a national laboratories and federal agencies. 相似文献
32.
I. Bodlund A. R. Pavankumar R. Chelliah S. Kasi K. Sankaran G. K. Rajarao 《International Journal of Environmental Science and Technology》2014,11(4):873-880
The use of natural coagulant protein in drinking water treatment has been discussed for a long time, though the method is still not in practice, probably due to limited knowledge and availability of material. In the present work, different Mustard varieties were tested for the presence of coagulant protein compared with Moringa seed extract and their potential application in water treatment. The coagulation activity of the protein extract was measured using synthetic clay solution as well as water from pond. The protein content was determined by Bradford method, molecular mass determined by Sodium dodecyl sulfate–polyacrylamide gel electrophoresis, and peptide sequence was analyzed by Mass spectrometry. Extract of Mustard (large) and Moringa seed showed coagulation activity of ?70 and ?85 % after 90 min, respectively. Interestingly, seed extracts from other Mustard varieties had coagulation activity after heat activation at 95 °C for 5 h. However, the coagulation activity of Mustard seed extract against turbid pond water was higher (?60 %) compared to Moringa seed extract (?50 %). The peptide sequence analysis of 6.5 and 9 kDa proteins was found to be homologous to Moringa coagulant protein and napin3, respectively. To our knowledge, this could be the first report on Mustard seed having coagulant protein. The coagulation activity of Mustard (large) against highly turbid pond water suggested that it could be a potential natural coagulant for water treatment. 相似文献
33.
34.
D. Bala Subrahamanyam Radhika Ramachandran S. Indira Rani P. K. Kunhikrishnan B. Prasad Kumar 《Boundary-Layer Meteorology》2008,127(2):333-344
Surface-layer meteorological observations obtained from oceanic buoys over the Korean Strait and the Yellow Sea are used to
estimate surface-layer turbulent fluxes of heat, moisture and momentum over the East-Asian Marginal Seas. Special emphasis
is paid towards explanation of the impact of the Tsushima warm current flowing through the Korean Strait on air–sea interface
fluxes. During the active phase of the Tsushima warm current, when the difference in sea surface temperature and air temperature
becomes as large as 8°C, the sensible heat flux increases to a value of about 135 W m−2, while the latent heat flux is around 200 W m−2. The study attempts to broaden our understanding on the air-sea interaction processes over the Yellow Sea and Korean Strait. 相似文献
35.
Denny P. Alappattu D. Bala Subrahamanyam P. K. Kunhikrishnan Radhika Ramachandran K. M. Somayaji R. Venkatesh G. S. Bhat A. Bhagavath Singh 《Boundary-Layer Meteorology》2008,126(2):297-309
We report the spatio-temporal variability of surface-layer turbulent fluxes of heat, moisture and momentum over the Bay of
Bengal (BoB) and the Arabian Sea (AS) during the Integrated Campaign for Aerosols, gases Radiation Budget (ICARB) field experiment.
The meteorological component of ICARB conducted during March – May 2006 onboard the oceanic research vessel Sagar Kanya forms
the database for the present study. The bulk transfer coefficients and the surface-layer fluxes are estimated using a modified
bulk aerodynamic method, and then the spatio-temporal variability of these air-sea interface fluxes is discussed in detail.
It is observed that the sensible and latent heat fluxes over the AS are marginally higher than those over the BoB, which we
attribute to differences in the prevailing meteorological conditions over the two oceanic regions. The values of the wind
stress, sensible and latent heat fluxes are compared with those obtained for the Indian Ocean Experiment (INDOEX) period.
The variation of drag coefficient (C
D
), exchange coefficients of sensible heat and moisture (C
H
= C
E
) and neutral drag coefficient (C
DN
) with wind speed is also discussed.
相似文献
36.
A. A. Deshpande R. Ramachandran G. Srinivasan 《Journal of Astrophysics and Astronomy》1995,16(1):53-67
A detailed statistical analysis of pulsarcurrent is presented. The conclusions reached are the following: (1) The birthrate of pulsars is about one in 75 ± 15 years. (2)
There is evidence forinjection of pulsars into the population of solitary pulsars. Such an injection is particularly pronounced in the magnetic field range
12 < logB < 12.6. (3) This is interpreted as due torecycled pulsars being released into the population. (4) We tentatively conclude that as much as 10 – 15% of all pulsars may have been born
and processed in binary systems. 相似文献
37.
Sujata Ramachandran 《Singapore journal of tropical geography》2002,23(3):311-332
The remarkable ease with which the xenophobic tenor of the Hindu Right nationalist organizations or Sangh Parivar found favour with many privileged Indians in the early 1990s cannot be easily or comfortably discounted. Indeed, it even perniciously swayed a moderate secular central government led by the long dominant Congress Party. By mid–1992, when Sangh Parivar made the manifold dangers of the unsanctioned immigration by growing numbers of poverty–stricken Bangladeshi Muslim peasants their rallying cry, the lenient attitude of the Indian state towards these immigrants had hardened with astonishing rapidity. Unsettled by this sweeping tide of Hindu chauvinism, a hurriedly enforced "Action Plan" to locate and identify these undocumented immigrants was followed by brisk efforts under "Operation Pushback" to deport them from New Delhi — India's capital city and locus of bureaucratic, political and financial power. Haphazard and sporadic in implementation, Operation Pushback, while unmasking partisan dispositions coursing through the Indian bureaucracy, also exemplified Congress' belated attempts at redeeming its enervated standing. It is also worth noting that the highly circumscribed material realities of the Bangladeshi immigrants residing in Delhi's numerous slums made them easy targets of these perverse politics, and that subsequent opposition, internally and from neighbouring Bangladesh, to the gratuitous brutality displayed towards the first groups of deportees contributed to the Operation's abrupt truncation. 相似文献
38.
Formation of mud banks along the southwest coast of India is marked by an unusual calmness of the nearshore area with a large
amount of suspensates in the water column and mud deposition. After cessation of the monsoon, the removal of mud from the
mud bank region is evident. Sediment dynamics worked out from the textural characteristics suggest resuspension of sediments
by waves and subsequent transportation of the suspended load by longshore/coastal currents as the main factors responsible
for the removal of sediments from the mud bank region during the post-monsoon season. 相似文献
39.
The hornblende-biotite gneisses of Central Kerala which cover approximately 490km2 exhibit schlieric and nebulitic structures, tending towards a homophanous nature and are classified here as diatexites. Mafic protoliths and restite biotite, each representing the refractory residuum of two independent partial melting episodes are widely present in the gneisses. The general mineral assemblage of the gneisses comprise quartz, K-feldspar, oligoclase, biotite and hornblende. Chemically, they are dominantly adamellitic and the behaviour of major and trace elements is consistent with a magmatic parentage. Based on petrochemical criteria, a two-stage evolution model is proposed here, which involves (i) partial melting of mafic granulites under high Archean geothermal gradients and generation of tonalite/trondhjemite through amphibole and plagioclase fractionation and (ii) partial melting and subsequent quartz-alkali feldspar fractionation of the tonalite/trondhjemite under amphibolite facies conditions with synchronous K-enrichment resulting in the diatectic adamellites. 相似文献
40.
The influence of a square base placed at the bottom of a vertical cylinder on the wave induced forces and pressures on the cylinder is reported in this paper. In order to carry out this study, initially, the two dynamic variables on the cylinder in the absence of the base was studied so as to make sure the quality of measurements is satisfactory. The experimental results are compared with MacCamy and Fuchs' theory and the agreement found good. 相似文献