نتایج جستجو برای: chlorofluorocarbons

تعداد نتایج: 647  

Journal: :Journal of occupational and environmental hygiene 2009
William A Heitbrink Douglas E Evans Bon Ki Ku Andrew D Maynard Thomas J Slavin Thomas M Peters

This study investigated the relationships between particle number, surface area, and respirable mass concentration measured simultaneously in a foundry and an automotive engine machining and assembly center. Aerosol concentrations were measured throughout each plant with a condensation particle counter for number concentration, a diffusion charger for active surface area concentration, and an o...

2008
Espen Bjertness Knut Stamnes Jakob J. Stamnes

The spectral distribution of the solar radiation reaching the Earth's surface depends on the irradiance emitted by the Sun, the Earth-Sun distance, and the transmission properties of the atmosphere. The changing Earth-Sun distance due to an eccentric orbit implies that the irradiance received at the top of the atmosphere varies with an annual cycle, being 6.9% above and below the yearly mean. T...

2016
Reiner Schlitzer

A global, coarse-resolution ocean model previously fitted to geostrophic shear estimates and to data of 10 hydrographic parameters and tracers has been used to simulate the 3He and 4He distributions resulting from the release of mantle helium from mid-ocean ridges. The model is in very good agreement with 14C and chlorofluorocarbon data and has realistic global ocean overturning strength as wel...

Journal: :Developmental medicine and child neurology 2012
Mary Jo Cooley Hidecker Nhan Thi Ho Nancy Dodge Edward A Hurvitz Jaime Slaughter Marilyn Seif Workinger Ray D Kent Peter Rosenbaum Madeleine Lenski Bridget M Messaros Suzette B Vanderbeek Steven Deroos Nigel Paneth

AIM To investigate the relationships among the Gross Motor Function Classification System (GMFCS), Manual Ability Classification System (MACS), and Communication Function Classification System (CFCS) in children with cerebral palsy (CP). METHOD Using questionnaires describing each scale, mothers reported GMFCS, MACS, and CFCS levels in 222 children with CP aged from 2 to 17 years (94 females,...

2003
J. L. Russell A. G. Dickson

[1] Calculation of the initial oxygen based on both phosphate and nitrate data collected along three WOCE transects indicates that the common assumption that new Antarctic Intermediate Water (AAIW) is initially saturated with respect to oxygen is incorrect. The initial oxygen concentration of AAIW is shown to be undersaturated, and the degree of undersaturation varies from year to year. Chlorof...

Journal: :Inquiry@Queen's Undergraduate Research Conference proceedings 2023

Over the last century, earth has seen unprecedented atmospheric concentrations contaminate our ecosystems due to human activity. Predictions state introduction of carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons (CFCs), will increase temperatures, change amount location precipitation causing more runoff. This could potentially result in disturbance events such as floods, be frequ...

Journal: :E3S web of conferences 2023

Falling back past few years rapid progress in Air pollution has become a life-threatening concern many nations throughout the world due to human activity, industrialisation, and urbanisation.. As result of these activities, sulphur oxides, carbon dioxide (CO2), nitrogen monoxide (CO), chlorofluorocarbons (CFC), lead, mercury, other pollutants be emitted into atmosphere. Simultaneously, estimati...

ژورنال: طلوع بهداشت یزد 2019
امانعلی خانی, شبنم, امراللهی, محسن, رضایی پندری, حسن, سلطانیان زاده, زهرا, قانعیان, محمدتقی,

Introduction: Chlorofluorocarbons are one of the most important ozone-depleting substances used as coolant gases in refrigerators and freezers in developing countries such as Iran. The objective of this study was to determine the knowledge, attitude, and practice toward the protection of cooling systems and control of ozone-depleting gases emission into the environment among health volunteers i...

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