Results 101 to 110 of about 2,055 (180)

Explainer: hydrofluorocarbons saved the ozone layer, so why are we banning them?

, 2017
On October 28, Australia ratified the Kigali Amendment to the Montreal Protocol. Australia is the tenth country to ratify, joining others as diverse as Mali, Norway and Rwanda in a global commitment to dramatically reduce hydrofluorocarbons (HFCs) in the
Stephen Wilson (19586287), Jenny Fisher (19586290)   +1 more
core   +1 more source

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, Volume 28, Issue 17, 9 September 2026.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source

Insights into the prediction of the liquid density of refrigerant systems by artificial intelligent approaches

Scientific Reports
This study presents a novel model for accurately estimating the densities of 48 refrigerant systems, categorized into five groups: Hydrofluoroethers (HFEs), Hydrochlorofluorocarbons (HCFCs), Perfluoroalkylalkanes (PFAAs), Hydrofluorocarbons (HFCs), and ...
Huaguang Li, Alireza Baghban
doaj   +1 more source

Permeation Characteristics of HFC-32 and HFC-125 through Dimethoxydiphenylsilane-Derived Silica Membranes Prepared via the Counter-Diffusion Chemical Vapor Deposition Method

Journal of Chemical Engineering of Japan
This study first evaluates the potential of amorphous silica membranes for separating hydrofluorocarbons (HFCs). The ideal selectivity of HFC-32 (difluoromethane) to HFC-125 (pentafluoroethane) through dimethoxydiphenylsilane-derived silica membranes was
Yuna Kobori, Junya Suzuki, Shin-ichi Nakao, Xiao-lin Wang, Shuhei Yamaguchi, Takashi Namikawa, Akiyoshi Yamauchi, Kazuki Akamatsu   +7 more
doaj   +1 more source

Research Progress on Application of Novel Low GWP Refrigerants in Temperature Range from −100 ℃ to 200 ℃

Zhileng xuebao
A refrigerant is an essential working fluid in a vapor-compression refrigeration cycle. Hydrofluorocarbons are currently used as refrigerants in refrigeration, air-conditioning, and heat pump systems and are potent greenhouse gases.
Zhang Di, Guo Zhikai, Yu Wanjin, Lu Peng, Liu Yaoyao, Liu Wucan, Zhang Jianjun   +6 more
doaj   +2 more sources

Estimation of Atmospheric Lifetimes of Hydrofluorocarbons, Hydrofluoroethers, and Olefins by Chlorine Photolysis Using Gas-Phase NMR Spectroscopy

, 2008
An empirical correlation has been derived between accepted atmospheric lifetimes of a set of hydrofluorocarbons and hydrofluoroethers and relative rates of reaction with photolyzed chlorine in excess at ambient temperature.
Paul J. Fagan (2317477), Eric J. Till (8663952), Concetta LaMarca (8663955), Robert L. Waterland (1813504), Alexander A. Marchione (2414782)   +4 more
core   +1 more source

Development of ambitious and realistic targets to reduce short-lived climate pollutant emissions in nationally determined contributions: case study for Colombia

Environmental Research Communications
Limiting global temperature increases to below 1.5 °C requires reductions in Short-Lived Climate Pollutants (SLCPs), like methane, black carbon, and hydrofluorocarbons (HFCs), which is rarely reflected in targets within Nationally Determined ...
Christopher S Malley, Jenniffer I Pedraza, Luisa González, Maria del Carmen Cabeza, Mauricio Gaitan, John H Melo, Silvia Ulloa, Johan C I Kuylenstierna, Seraphine Haeussling, Elsa N Lefèvre   +9 more
doaj   +1 more source

Vapor−Liquid−Liquid Equilibria of Hydrofluorocarbons + 1-Butyl-3-methylimidazolium Hexafluorophosphate

, 2016
In recent reports, we measured the vapor−liquid−liquid equilibria (VLLE) of trifluoromethane (R-23) and pentafluoroethane (R-125) with a room-temperature ionic liquid (RTIL), 1-butyl-3-methylimidazolium hexafluorophosphate [bmim][PF6], using a volume ...
A. Yokozeki (1273581), Mark B. Shiflett (1273575)   +1 more
core   +1 more source

Neutron and Raman Spectroscopes of 134 and 134a Hydrofluorocarbons Encaged in Na-X Zeolite

, 1994
Inelastic neutron scattering methods were used in conjunction with Raman spectroscopy to probe the vibrational density of states of the hydrofluorocarbons (HFCs) 134 (HF2C-CF2H) and 134a (F3C-CFH2) adsorbed in the cages of dehydrated Na-X zeolite.
R. R. Cavanagh, M. K. Crawford, T. J. Udovic, J. J. Rush, D. R. Corbin, C. P. Grey, J. M. Nicol   +6 more
core   +1 more source

Thermodynamic properties of binary mixtures containing of hydrofluorocarbons and hydrofluorolefins: new data and modelling

, 2018
Hydrofluorolefins (HFOs) are a new class of more environmentally-friendly refrigerant with zero ozone depletion potential, low global warming potentials, and low flammability.
Rowland, Darren, Al Ghafri, Saif, May, Eric, Tsuji, Tomoya, Seiki, Yoshio, Tanaka, Yukio, Xiong, Xiao, Akhfash, Masoumeh, Khamphasith, Martin, Hughes, Thomas J., Niya, Arash Arami   +10 more
core