General Physical Properties of External Galaxies

1959 ◽  
pp. 311-372 ◽  
Author(s):  
G. De Vaucouleurs
Keyword(s):  
Physical Properties ◽  
External Galaxies ◽  
General Physical

The general physical properties of manganese metal

1968 ◽  
Vol 13 (1) ◽  
pp. 97-114 ◽  
Author(s):  
George Terence Meaden
Keyword(s):  
Physical Properties ◽  
General Physical

Observations on the Physical Properties of Sea-Ice at Hopedale, Labrador

ARCTIC ◽  
1958 ◽  
Vol 11 (3) ◽  
pp. 134 ◽  
Author(s):  
Wilford F. Weeks ◽  
Owen S. Lee
Keyword(s):  
Sea Ice ◽  
Physical Properties ◽  
Air Force ◽  
Sea Water ◽  
Field Studies ◽  
Water Levels ◽  
Cambridge Research ◽  
Freezing Period ◽  
Before And After ◽  
General Physical

Preliminary results are reported of field studies 1955-56 by the U.S. Air Force Cambridge Research Center, the Hydrographic Office and SIPRE on the general physical properties of sea ice; methods of measurement are described. Characteristics of sea water during the freezing period are outlined: formation, structure, and salinity of the initial ice cover, formation and characteristics of infiltrated snow-ice, growth of the ice and influencing factors, density of the ice at various periods, and crack formation are discussed. Data on the salinity of sea ice formed during during wave action and that of sheet-ice, hourly averages of air and ice temperatures at various levels, snow and slush density and thickness, observed slush levels and theoretical water levels are shown. Salinity of ice before and after the slush layer froze, and that of deteriorating ice , salinity of ice vs. ice thickness, thickness of ice versus degree-days, the density of the ice, and measured ice densities vs. theoretical density of air-free sea ice at -15 C are figured and discussed. The orientation of sea ice c-axes and of infiltrated snow-ice c-axes are diagrammed.--From SIPRE.

GENERAL PHYSICAL PROPERTIES OF SOILS IN THE CHIRCHIK BASIN

2021 ◽  
Author(s):  
R Kurvantaev ◽  
Z Khalilova
Keyword(s):  
Physical Properties ◽  
General Physical

Изучение современное состояние обшие физичкские свойства почв Чирчикского бассена является актуальным вопросам. Во всех изученных геоморфологических районах удельная масса почвы колеблется от 2,52 до 2,71 г/см3. Оптимальная плотность сложения (1,13-1,38 г/см3) было отмечено на целинных горнокоричневых, орошаемых типичных сероземах, серозёмно-луговых и луговых почвах. Общая порозность горнокоричневых почвах очень высокая (53-61%), богарных тёмных сероземах, орошаемых типичных серозёмах, серозёмно-луговых и луговых почвах составляет 50 - 56%.

Natural Rubber Compounds for Intermittent Low Temperature Service

1957 ◽  
Vol 30 (2) ◽  
pp. 652-666
Author(s):  
W. P. Fletcher ◽  
A. N. Gent ◽  
R. I. Wood
Keyword(s):  
Transition Temperature ◽  
Low Temperature ◽  
Natural Rubber ◽  
Physical Properties ◽  
Dynamic Stiffness ◽  
Theoretical Treatment ◽  
Rubber Compounds ◽  
Second Order Transition ◽  
General Physical ◽  
Silicone Rubbers

Abstract The changes in physical properties of rubber vulcanizates on approaching the so-called second order transition temperature are discussed and distinction is drawn between these phenomena and those associated with crystallization. A simple apparatus of the torsional pendulum type is used to determine the dynamic stiffness and hysteresis loss factor at a frequency of about 0.5 c.p.s. of vulcanizates in the temperature range 20 to −120° C. A large number of liquids are examined as potential plasticizers for lowering the rubber to glass transition temperature and a number are shown to have a high order of efficiency in this respect. Of these materials some also conform to the overriding requirements of low volatility and adequate compatibility with rubber. The loss in physical properties consequent on increase of plasticizer content is not markedly different for most of the plasticizers. Di-iso-octyl adipate is representative of the liquids which give useful low temperature plasticization and a number of commercial type compounds are developed using this plasticizer with carbon black or silica reinforcement, some of these have transition temperatures approaching those of the silicone rubbers but with a better level of general physical properties. A tentative theoretical treatment for the low temperature plasticization of nonpolar rubbers is discussed and this leads to a law which has been found to predict fairly well the transition temperature of a plasticized natural rubber compound in terms of the index of variation with temperature of the plasticizer viscosity.

3. Measurement in the physical sciences and engineering

2016 ◽  
pp. 39-59
Author(s):  
David J. Hand
Keyword(s):  
Quantum Theory ◽  
Magnetic Flux ◽  
Physical Properties ◽  
Physical Sciences ◽  
Science And Engineering ◽  
Force Time ◽  
General Physical ◽  
Physical Phenomena ◽  
Charge Temperature ◽  
Current Potential

As new physical phenomena are discovered, new kinds of instruments have to be devised to measure them and old physical units are regularly redefined. It has also been necessary for measurement accuracy to increase as science and engineering has progressed. ‘Measurement in the physical sciences and engineering’ looks at the measurement of some important physical properties: length and distance; area and volume; mass, weight, and force; time; temperature; electrical and magnetic units such as electrical charge, current, potential, resistance, inductance, magnetic flux, and frequency; and measurement in quantum theory. In general, physical properties can be expressed as monomial combinations of six base attributes: charge, temperature, mass, length, time, and angle.

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