On the comparison of laboratory electromagnetic analogue model measurements and finite-difference numerical calculations     

H.W. Dosso  V. Ramaswamy  F.W. Jones  D.J. Thomson 《Physics of the Earth and Planetary Interiors》1974,9(2):108-110

This work compares experimental analogue model measurements and finite-difference numerical calculations of the electric and magnetic fields for the cases of induction in a highly conducting plate and wedge embedded in a poorly conducting host earth. The results indicate very good agreement between the experimental and theoretical results and confirm the validity of the analogue and numerical methods for studying complex induction problems.  相似文献   

A comparative study of the observations of high clouds and simulations by an atmospheric general circulation model     

R T Wetherald  V Ramaswamy  S Manabe 《Climate Dynamics》1991,5(3):135-143

The importance of clouds in the upper troposphere (cirrus) for the sensitivity of the Earth's climate e.g., requires that these clouds be modeled accurately in general circulation model (GCM) studies of the atmosphere. Bearing in mind the lack of unambiguous quantitative information on the geographical distribution and properties of high clouds, the simulated distribution of upper tropospheric clouds in a spectral GCM is compared with several satellite-derived data-sets that pertain to high clouds only, for both winter and summer seasons. In the model, clouds are assumed to occupy an entire gridbox whenever the relative humidity exceeds 99%: otherwise the grid box is assumed to be free of cloud. Despite the simplicity of the cloud prediction scheme, the geographical distribution of the maxima in the model's upper tropospheric cloud cover coincides approximately with the regions of the observed maxima in the high cloud amount and their frequency of occurrence (e.g., intertropical convergence zone and the monsoon areas). These areas exhibit a minimum in the outgoing longwave radiation (OLR; Nimbus-7) and are also coincident with regions of heavy precipitation. The model, with its relatively simple cloud formation scheme, appears to capture the principal large-scale features of the tropical convective processes that are evident in the satellite and precipitation datasets, wherein the intense, upward motion is accompanied by condensation and the spreading of thick upper tropospheric layers of high relative humidity and cloudiness in the vicinity of the tropical rainbelt regions.This paper was presented at the International Conference on Modelling of Global Climate Change and Variability, held in Hamburg 11–15 September 1989 under the auspices of the Meteorological Institute of the University of Hamburg and the Max Planck Institute for Meteorology. Guest Editor for these papers is Dr. L. Dümenil  相似文献   

Environmental evaluation of medchal taluk,Andhra Pradesh using aerial photographs     

S. M. Ramaswamy  Manohar Sinha  C. Devprasad 《Journal of the Indian Society of Remote Sensing》1984,12(2):39-46

The human interaction with nature in the form of improper exploitation and unplanned utilisation of natural resources has caused a lot of environmental imbalance in nature. The aerial photographs and other repetitive orbital remote sensing data provide valuable information in identification and surveying of such environmentally imbalanced zones. In this study the aerial photographs were used in identifying such vulnerable areas and some remedial measures are suggested for the planned exploitation of natural resources without damaging the environment.  相似文献   

Palaeomagnetic study of some charnockites of the Palni Hills     

K. Ramaswamy  P. Ramanathan 《Physics of the Earth and Planetary Interiors》1982,28(3):269-272

The intensity of natural remanence magnetisation (NRM) is measured along the three mutually-perpendicular directions using an astatic magnetometer. The intensity of induced magnetisation is measured using an apparatus fabricated in the laboratory. The Koenigsberger ratio has been calculated for all the samples and the ratio has been used to test the stability of NRM in the samples. The mean direction of magnetisation is determined from the three components of the NRM intensity. The palaeomagnetic pole position of the samples is determined using the direction of magnetisation and the site location. An attempt has been made to fix the geological age of the charnockites using palaeomagnetic methods.  相似文献   

Rapid visual screening of different housing typologies in Himachal Pradesh,India     

Ajay Kumar  Sreerama  Rajaram  Chenna  Mishra  Shashank  Pradeep Kumar  Ramancharla  Karnath  Anoop 《Natural Hazards》2017,85(3):1851-1875

Natural Hazards - Methods capable of assessing the vulnerability of houses for future earthquakes are of fundamental importance for the safety and development of an area. As the detailed assessment...  相似文献   

Estimation of Cd,Pb and flame retardants in electric mosquito bat using EDXRF,ICP-OES,AAS and GC–MS     

B. Divya  S. Harish  K. Ramaswamy  M. Kishorebabu  N. Raju  R. Govindaiah  U. Rambabu  N. R. Munirathnam 《International Journal of Environmental Science and Technology》2017,14(12):2603-2612

In the present study, investigated the concentrations of hazardous substances such as Pb, Cd and polybrominated flame retardants present in an electric mosquito bats, which are used for trapping the mosquitoes in the domestic areas. China has captured a big share of mosquito bat market in India and penetrated deep into rural areas also. The presence of hazardous substances is fatal to environment and human beings. Hence, the concentrations of hazardous substances present in the bats need to be estimated accurately. The dismantled homogeneous samples were subjected to estimate the toxic metals like cadmium and lead by using energy-dispersive X-ray fluorescence spectroscopy, inductively coupled plasma optical emission spectroscopy and atomic absorption spectroscopy for comparison. The flame brominated retardants were tested using gas chromatography–mass spectrometer. The analytical data obtained from the power supply wires of the bat suggest that the concentration levels of cadmium found to be below the detection limits. Whereas the lead content has higher in the range of 3574–7575 ppm than the permissible limits set by the e-waste rule, i.e. 1000 ppm. Moreover, the high amount of lead (>80,000 ppm) was obtained in the printed circuit board apart from power supply wires of mosquito bat. The content of brominated flame retardants in mosquito bat was estimated to be within the limits of e-waste rule. Considering their significant high hazardous metals content, coupled with their large quantities of mosquito bats used in the country, there is a need to control the hazardous waste of mosquito bats.  相似文献