Keywords

A B C D E F G H I J K L M N O P Q R S T U V W X-Z 0-9

Temperature

	New Density-based Thermal Conductivity Equation for Snow Author : Aggarwal, R.K. ;Negi, P.S.;Satyawali, P.K. Source : Defence Science Journal ; Vol:59(2) ; 2009 ; pp 126-130 Subject : 53 Applied Physics;551.46 Oceanography;551.578.48 Avalanche Keywords : Empirical;Snow microstructure;Snowpack;Temperature;Thermal conductivity Abstract : More than two hundred thermal conductivity measurements for different snow densities and snow types were carried out in-situ at a field research station located in greater Himalayan range of India. These measurements were carried out using a commercially available portable thermal conductivity meter. Thermal conductivity measurements were carried out on the fresh snow, equi-temperature snow, and surface hoar and temperaturegradient snow. Average thermal conductivity of snow varied from 0.08 W/mK (Fresh snow of 120 kg/m3 density) to 0.32 W/m K (Equi-temperature snow of 420 kg/m3 density). Based on these measurements, a new density-based thermal conductivity equation is proposed. Using this proposed equation, modeled snowpack temperatures showed closer agreement with the observed data as compared to the predictions based on other well-known empirical and theoretical thermal conductivity equations for snow. This study highlights the advantages and limitations of empirical based thermal conductivity equations over the complex models based on snow microstructure.
	Assessment of environmental heat load Author : Majumdar, N.C. Source : Defence Science Journal ; Vol:8(3) ; 1958 ; pp 245-252 Subject : 551.5 Meteorology Keywords : Heat ;Environment ;Temperature Abstract : Merits and demerits of existing indices of heat stress like Effective Temperature, Corrected Effective Temperature and Predicted four-hour Sweat Rate, have been briefly discussed. None of them being applicable in the open sun, two indices, New Corrected Effective Temperature, have been developed respectively at the Defence Research Laboratory (Stores), Kanpur; and the Defence Science Laboratory, New Delhi, taking into account different colors of clothing and complexion of skin. The possibility of using dry and wet Kata cooling powers for rough but quick assessment of heat load has been explored.
	On the estimation of temperature in Monroe jets Author : Singh, Sampooran Source : Defence Science Journal ; Vol:6(2) ; 1956 ; pp 139-142 Subject : 551.5 Meteorology Keywords : Temperature ;Munroe jets Abstract : Recently Stettbacher (see reference 5) calculated the temperature of a 'Munroe' jet to be about half a million degrees. This article presents a revised estimate of the temperature in a jet and it is shown that the temperature of the metal in the jet during its flight in air is of the order of several thousand degrees (approximately 5000degree). If, however, two 'fast' jets collide with each other, then there is a possibility of obtaining a temperature of 10/Sup6 to 10/Sup7 degrees.
	On Meteorological Observations At Leh During Winter(1960-61) Author : Sharma, R.N.;Krishna, Bal Source : Defence Science Journal ; Vol:14(2) ; 1964 ; pp 123-138 Subject : 551.5 Meteorology Keywords : Meteorological data;Leh;Temperature Abstract : Meteorological data recorded at Leh (3520 metres) during the winter (60-61)has been presented. January is the coldest month with lowest maximum and minimum air temperatures, the mean values being -2.4 degree celsius and -13.7 degree celsius respectively. The relative humidity is 48%. The hours of sunshine are also minimum,16 hrs in four days. The solar radiation thermometer reads 20 degree celsius indicating a high solar energy flux on clear days. The sky remains mostly overcast from mid December to mid February. The average wind speed is quite low (range 0.43-5.12 km/hr)with occasional high velocity gusts for short duration. The readings of the solar radiation thermometer are always higher than the ground temperature. The globe thermometer also records a higher temperature except when higher wind speeds affect its readings . A steep temperature gradient is observed beneath the ground surface. rains are scanty and rare. The data provides A basis for working out clothing requirement for comfort
	Degradation of Woolen Fabric by the Fungus Ctenomyces species: Part-I Author : Bajpal, L.S.;Agarwal, P.N.;Puvathingal, J.M. Source : Defence Science Journal ; Vol:14(2) ; 1964 ; pp 145-150 Subject : 579 MicroBiology;687 Textiles and Clothing Keywords : Ctenomyces;Growth;Temperature Abstract : The influence of various factors, viz. temperature, pH and period of incubation on the growth of the fungus ctenomyces sp. and on its activity with regard to the degradation of serge white lining (woolen fabric) has been studied. The results indicate that the growth and activity of the organism were maximum at temperature near about 30 degree celsius. The variation in pH (from 2.3 to 7.0) of the medium does not seem to influence the growth and or activity of the organism. Increase in the period of incubation from 4 to 24 days steadily increased the growth and activity of the organism.
	Temperature Profile of a Fluid between Two Rotating Porous Cylinders Author : Rai, Jaswant ;Krishan, Bal Source : Defence Science Journal ; Vol:20(3) ; 1970 ; pp 183-186 Subject : 536 Thermodynamics Keywords : Inner cylinders ;Angular velocities;Temperature Abstract : An exact expression for the temperature profile between two concentric rotating porous cylinders has been obtained. The results are presented graphically. For the wide gap, there is a sharp rise in temperature when the ratio between the angular velocities of the outer and the inner cylinders tends to zero.
	Study of the effect of temperature and humidity on nylon fabrics under storage Author : Nadkarni, P.S. Source : Defence Science Journal ; Vol:11(2) ; 1961 ; pp 116-120 Subject : 687 Textiles and Clothing Keywords : Nylon fabrics;Temperature;Humidity Abstract : Investigations were undertaken to study the effect of temperature and humidity on the storage life of nylon fabrics. Nylon fabrics were stored under controlled conditions of temperature and humidity and their breaking and bursting strength were determined periodically. It was found that there was no significant change in the strength of the fabrics even after a period of about 8 and half years when stored of temperatures as high as 85DegreeF and relative humidities as high as 90%.
	Vertical temperature structure of the sea along the south coast of India Author : Ramasastry, A.A. Source : Defence Science Journal ; Vol:4(4) ; 1954 ; pp 189-198 Subject : 551.5 Meteorology Keywords : Temperature ;Bathythermographs Abstract : Using bathythermographs, the sea temperature was studied at 37 stations and to a depth of 900 feet during a cruise from Visakhapatnam around Ceylon to Cochin. Vertical temperature cross sections have been constructed for 2DegreeF. intervals. The results were compared with those of Raghu Prasad who recently made a study up to 200 feet in Bay of Bengal. Detailed discussion of structure is presented.
	Calculation of Thermal Conductivity of Polyatomic Gas Mixtures at high Temperatures Author : Gupta, G.P.;Saxena, S.C. Source : Defence Science Journal ; Vol:16(3) ; 1966 ; pp 165-176 Subject : 536 Thermodynamics Keywords : Thermal conductivity;Temperature ;Polyatomic Gas Abstract : Reliable methods for prediction of thermal conductivity at high temperature are very useful for a variety of important practical needs. Three different methods (i) approximate (ii) semitheoretical and (iii) empirical have been investigated. The success of these procedures is demonstrated by actual computation for a large number of systems at temperature and compositions where direct meaurements are available. These procedures are valuable as the rigorous theory being complicated requires a large amount of input information and even then leads to unreliable values.
	Hydrological Characteristics of the Visakhapatnam Harbour Author : Ramam, K.V.S. ;Murthy, K.V.S. Source : Defence Science Journal ; Vol:22(3) ; 1972 ; pp 177-182 Subject : 556 Hydrology Keywords : Hydrological parameters ;Temperature Abstract : Studies on the distribution of temperature and salinity in the Visakhapatnam harbour during the months of November-December 1966 and June-July 1967, showed marked seasonal variations. In winter both the temperature and salinity values are low throughout the depth column, while in late summer there is a significant increase in their values. The effect of tide and rainfall on the hydrological parameters has been discussed.
	A Note on the Laminar Heat Transfer in an Annulus Author : Parvathamma, S.;Devanathan, Rathna Source : Defence Science Journal ; Vol:29(3) ; 1979 ; pp 117-122 Subject : 536 Thermodynamics Keywords : Exact solution;Temperature;Eigen value Abstract : An exact solution for the fluid temperature due to forced convective heat transfer in an annulus is obtained as a solution of the eigen value problem.
	Cobalt Doping of Barium Titanate Ceramic Author : Singh, Varan Source : Defence Science Journal ; Vol:16(3) ; 1966 ; pp 177-180 Subject : 54 Chemistry Keywords : Electric fields;Titanate ceramic;Temperature Abstract : Pure barium titanate ceramic cannot be used as underwater transducer where high electric fields of the order of I K.V./cm. are applied across the two faces for the ceramic. High field dielectric losses are reduced by the addition of small percentage of cobalt to barium titanate ceramic. Dielectric constant of cobalt doped barium titanate ceramic as a function of temperature shows a marked change over plain barium titanate ceramic.
	Concept of Temperature in Plasma and its measurement. Author : Rao, P.S.R. Source : Defence Science Journal ; Vol:12(2) ; 1962 ; pp 23-27 Subject : 533.9 Plasma;53 Applied Physics Keywords : Plasma ;Temperature Abstract : This paper reviews the concept of temperature, and its measurement in general and in particular the concept of temperature in a 'plasma' and the measurement of electron temperature and ion temperature.
	Effect of Temperature and Maze Learning on Simple Muscular Activity of White Rats Author : Sharma, V.M. ;Deb, A.N. Source : Defence Science Journal ; Vol:15(3) ; 1965 ; pp 213-220 Subject : 57.089 Biomedical Sciences Keywords : Proteus ;Superiority;Temperature Abstract : The paper discusses the effects of temperature variation on the simple muscular activity of white rats. Two groups of white rats were selected. Members of one group were trained to run a proteus maze prior to the experiment. Muscular activity of both the groups was compared when subjected to temperature variation. The results show a superiority of trained rats over the others in respect of their muscular activity.