Results 251 to 260 of about 1,621,211 (304)

Exercise, Heat, Hydration and the Brain

Journal of the American College of Nutrition, 2007
The performance of both physical and mental tasks can be adversely affected by heat and by dehydration. There are well-recognized effects of heat and hydration status on the cardiovascular and thermoregulatory systems that can account for the decreased performance and increased sensation of effort that are experienced in the heat.
Susan M Shirreffs
exaly   +3 more sources

Hydration and Heat Development

, 2018
The driving process of early-age cracking in massive element is the hydration and reactions of the binder that composes the concrete. Indeed, these reactions are highly exothermic and lead to heat generation in the structure. It is thus of primary importance to be able to characterise and predict the heat generation of binders in order to assess the ...
Lacarriere, Laurie, Knoppik, Agnieszka, Leal da Silva, Wilson Ricardo, Honorio, Tulio, Šmilauer, Vit, Asamoto, Shingo, Fairbairn, Eduardo   +6 more
openaire   +2 more sources

Heat of Hydration for Cement

Transportation Research Record: Journal of the Transportation Research Board, 2011
The heat of hydration of hydraulic cements depends on a complex set of phase dissolution and precipitation reactions following the addition of water. Heat of hydration is currently measured in one of two ways: acid dissolution of the raw cement and a hydrated cement after 7 days or isothermal calorimetry.
Paul Stutzman, Stefan Leigh, Kendall Dolly   +2 more
openaire   +1 more source

Heat of hydration

Journal of Chemical Education, 1971
A commonly published experiment can be expanded so that students may obtain the enthalpy of the reaction between anhydrous salts and water.
openaire   +1 more source

Beat the Heat: Managing Heat and Hydration in Marching Band

The Journal of School Nursing, 2002
Marching band students are athletes who practice outdoors under conditions that expose them to dehydration, heat exhaustion, and sunstroke. They suffer these heat-related injuries because breaking formation frequently to adequately hydrate is impractical.
openaire   +2 more sources

Hydration effects on thermoregulation and performance in the heat

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2001
During exercise, sweat output often exceeds water intake, producing a water deficit or hypohydration. The water deficit lowers both intracellular and extracellular fluid volumes, and causes a hypotonic-hypovolemia of the blood. Aerobic exercise tasks are likely to be adversely effected by hypohydration (even in the absence of heat strain), with the ...
M N, Sawka, S J, Montain, W A, Latzka
openaire   +2 more sources

Heat of hydration in concrete

Magazine of Concrete Research, 1954
Summary The paper traces the development of a function between time and temperature, which makes it possible to refer the process of hardening of concrete at varying temperature to hardening at constant temperature. It is further shown that it is possible to predetermine the temperature of concrete during hardening when properties of concrete, sizes
openaire   +2 more sources

Heat capacity and heat of dissociation of methane hydrates

AIChE Journal, 1988
AbstractThe objective of this study was to determine the heat capacity and heat of dissociation of methane hydrates. A technique has been devised which circumvents the two major problems encountered in measuring gas hydrate heat capacity: the need to impose a mechanical pressure during the measurement and the need to have an absolutely pure hydrate ...
Roger M. Rueff, E. Dendy Sloan, Victor F. Yesavage   +2 more
openaire   +1 more source

Hydration Heats of Zeolites For Evaluation of Heat Exchangers

Journal of Thermal Analysis and Calorimetry, 2001
The enthalpy of hydration of purified clinoptilolite from Beli Plast, Bulgaria, and various cation-exchanged types such as Na-, K-, Ca- and Mg-clinoptilolite was determined by the adiabatic water-vapor absorption calorimeter. The hydration enthalpy becomes more exothermic in the sequence K, Na, Ca, Mg depending on hydration energy values of exchanged ...
N. Petrova, T. Mizota, K. Fujiwara
openaire   +1 more source

Measurement of the heat of hydration of cement

Cement and Concrete Composites, 1991
Abstract The traditional method by which the heat of hydration of cement has been determined in most European countries has been by measurement of the heat of solution. Initially developed for Portland cements, this method requires a high degree of operator competence to achieve reliable results.
P. Livesey, A. Donnelly, C. Tomlinson
openaire   +1 more source