排序方式： 共有5条查询结果，搜索用时 15 毫秒
1
1.
Making use of a previously reported, simple, approximate method of analysis, a critical evaluation is made of the dynamic pressures and forces induced by horizontal ground shaking on a pair of infinitely long, parallel walls retaining a uniform viscoelastic solid. The walls are presumed to be rigid but elastically constrained against rotation at their base. The effects of both harmonic and earthquake-induced excitations are examined. The accuracy of the method is assessed by comparing its predictions for the special case of fixed-based walls with those obtained by an exact method, and comprehensive numerical data are presented which elucidate the underlying response mechanisms, and the effects and relative importance of the parameters involved. The parameters examined include the characteristics of the ground motion, the ratio of the distance between walls to the height of the contained material, and the flexibility of the rotational wall constraints. In addition to valuable insights into the responses of the systems investigated, the results presented provide a convenient framework for the analysis of more complex systems as well. 相似文献
2.
We report here on the observation and offline detection of the meteotsunami off the New Jersey coast on June 13, 2013, using coastal radar systems and tide gauges. This work extends the previous observations of tsunamis originating in Japan and Indonesia. The radars observed the meteotsunami 23 km offshore, 47 min before it arrived at the coast. Subsequent observations showed it moving onshore. The neighboring tide gauge height reading provides confirmation of the radar observations near the shore. 相似文献
3.
4.
Nishith Y. Bhatt Satish J. Patel Dipal A. Patel Hardik P. Patel 《Journal of the Geological Society of India》2009,74(4):515-530
Behavioural activities of the goby fish-Periophthalmodon septemradiatus were observed in the intertidal zone around Navinal coast in the Gulf of Kachchh, western India. Intertidal zone is broad,
and comprise of creeks, which are muddy and vegetated by mangrove on eastern side and ridge runnel systems on western side
of the study area which are hospitable for the goby fish. Different types of biogenic activities are observed such as crawling,
pellet making, grazing and burrowing. The crawling activity is part of movement of the goby fish from one burrow to another
burrow and pellet making activity is part of burrow modification. The grazing activity is feeding on the surface mud after
receding of tide and exposure of the tidal flat by left and right movement of the front part of the body. The most conspicuous
activity is burrowing, they construct unlined, vertical to incline ‘I’, ‘J’ and ‘Y’ shaped branched, circular to oval burrows
with varying diameter and depth. In the muddy sediments goby fish produced circular to oval rimmed muddy lumps as surfacial
expression around the burrows and further produced funnel shape depression and downward extended cylindrical holes, while
in the runnels burrows are usually small and simple. The trail is consisting of fin marking on either side of the tail marks
(grooves) which are radiate around the burrows. Occasionally burrows are interconnected in more than one burrow system which
is nested within single funnel structure on the surface.
The burrow systems of the goby fish in the intertidal sediments serves for protection and dwelling purpose and most importantly
these burrows are irrigated by water which supply the oxygen and keep body surface wet. The overall dimensions of the burrow
decrease towards the lower intertidal zone. In all, behavioural structure produced by the goby fish marks the combined activity
of dwelling, feeding and grazing. The complex behavioural mechanisms have helped the goby fish to survive and flourish in
the harsh intertidal environments along the Navinal Coast, in the Gulf of Kachchh. 相似文献
5.
M. B. Potdar S. A. Sharma V. Y. Parikh P. C. S. Devara P. E. Raj Y. K. Tiwari R. S. Maheskumar K. K. Dani S. K. Saha S. M. Sonbawne Y. Jaya Rao G. Pandithurai 《Journal of Earth System Science》2004,113(1):103-116
With the launch of the German Aerospace Agency's (DLR) Modular Opto-electronic Scanner (MOS) sensor on board the Indian Remote
Sensing satellite (IRS-P3) launched by the Indian Space Research Organization (ISRO) in March 1996, 13 channel multi-spectral
data in the range of 408 to 1010 nm at high radiometric resolution, precision, and with narrow spectral bands have been available
for a variety of land, atmospheric and oceanic studies. We found that these data are best for validation of radiative transfer
model and the corresponding code developed by one of the authors at Space Applications Centre, and called ATMRAD (abbreviated
for ATMospheric RADiation). Once this model/code is validated, it can be used for retrieving information on tropospheric aerosols
over ocean or land. This paper deals with two clear objectives, viz.,
The data validation procedure essentially involves
The results show that the model performance is satisfactory and a relationship between the spectral parameters of MOS radiances
and aerosol optical thickness can be established. In this communication, we present the details of the experiments conducted,
database, validation of the ATMRAD model and development of the relationship between AOT and MOS radiance. 相似文献
| 1 | Validation of ATMRAD model/code using MOS data and synchronously measured atmospheric data, and if found performing well, then to |
| 2 | derive relationship between MOS radiances and Aerosol Optical Thickness (AOT). |
| – | •near-synchronous measurements of columnar aerosol optical thickness and altitude profiles of aerosol concentration using ground-based multi-filter solar radiometers and Argon-ion Lidar, respectively and |
| – | •computation of the top-of-the-atmosphere (TOA) radiances from a low reflecting target (near clear water reservoir in the present study) using the ATMRAD model. |
1