Results 41 to 50 of about 26,984 (232)

Trace chemical measurements from the northern midlatitude lowermost stratosphere in early spring: Distributions, correlations, and fate [PDF]

, 1997
In situ measurements of a large number of trace chemicals from the midlatitude (37-57°N) lower stratosphere were performed with the NASA DC-8 aircraft during March 1994.
Blake, DR, Bradshaw, JD, Chen, Y, Gregory, GL, Heikes, B, Kondo, Y, Sachse, GW, Singh, HB, Talbot, R, Thornton, D   +9 more
core   +1 more source

A Methodology to Integrate Closed‐Cycle Heat Pumps into Batch Distillation Columns

Chemie Ingenieur Technik, EarlyView.
Batch distillation often cannot use vapor recompression due to contamination risks in food and pharma. This study proposes a design for integrating closed‐loop heat pumps using natural fluids. Results show significant energy savings, offering a sustainable alternative to traditional setups.
Philipp Dorn, Michael Libuda, Thomas Meyer, Christian Hoffmann, Jens‐Uwe Repke, Stefan Elbel   +5 more
wiley   +1 more source

C₂-C₁₀ hydrocarbon emissions from a boreal wetland and forest floor [PDF]

Biogeosciences, 2006
Emissions of various C2-C10 hydrocarbons (VOCs) and halogenated hydrocarbons (VHOCs) from a boreal wetland and a Scots pine forest floor in south-western Finland were measured by the static chamber technique. Isoprene was the main non-methane hydrocarbon
H. Hellén, H. Hakola, K.-H. Pystynen, J. Rinne, S. Haapanala   +4 more
doaj  

Analysis of relative concentration of ethanol and other odorous compounds (OCs) emitted from the working surface at a landfill in China.

PLoS ONE, 2015
Estimating odor emissions from landfill sites is a complicated task because of the various chemical and biological species that exist in landfill gases.
Dong Li, Wenjing Lu, Yanjun Liu, Hanwen Guo, Sai Xu, Zhongyuan Ming, Hongtao Wang   +6 more
doaj   +1 more source

Source origins, modeled profiles, and apportionments of halogenated hydrocarbons in the greater Pearl River Delta region, southern China [PDF]

, 2009
We analyze 16-month data of 13 major halocarbons measured at a southern China coastal site in the greater Pearl River Delta (PRD). A total of 188 canister air samples were collected from August 2001 to December 2002.
Barletta, B, Blake, DR, Ding, AJ, Fu, TM, Guo, H, Hung, WT, Li, YS, Meinardi, S, Rowland, FS, Saunders, SM, Simpson, IJ, Wang, T   +11 more
core   +1 more source

Effect of HBr on Explosion Limits of Stoichiometric Hydrogen‐oxygen Mixture

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT This work, based on numerical simulations, discusses the effect of HBr as an inhibitor on the explosion limit of stoichiometric hydrogen‐oxygen gas mixture in a closed spherical vessel. The numerical simulation solves the complete governing equations for mass, momentum, species and energy.
Chunkan Yu, Peter Glarborg
wiley   +1 more source

Microbial Enzymes Used in Bioremediation

Journal of Chemistry, 2021
Emerging pollutants in nature are linked to various acute and chronic detriments in biotic components and subsequently deteriorate the ecosystem with serious hazards.
Sobika Bhandari, Darbin Kumar Poudel, Rishab Marahatha, Sonika Dawadi, Karan Khadayat, Sitaram Phuyal, Shreesti Shrestha, Santosh Gaire, Kusum Basnet, Uddhav Khadka, Niranjan Parajuli   +10 more
doaj   +1 more source

Chemical Ionization Mass Spectrometry: Fundamental Principles, Diverse Applications, and the Latest Technological Frontiers

Mass Spectrometry Reviews, EarlyView.
ABSTRACT The review examines the evolution of chemical ionization mass spectrometry (CI‐MS), a technique developed in 1966 by Field and Munson. CI is a soft‐ionization method that produces more intense molecular ions with less fragmentation than electron ionization (EI).
Malvika Dutt, Adriana Arigò, Giorgio Famiglini, Pierangela Palma, Achille Cappiello   +4 more
wiley   +1 more source

Prediction of the acentric factor of some halogenated hydrocarbons via group contribution techniques

Journal of Nigerian Society of Physical Sciences
In this study, trends in the prediction of acentric factors of halogenated alkanes (HAs) were investigated using two group contribution techniques. The examination of discrepancies between predicted and experimental values for both methods served to ...
Charles Otobrise, Godwin Eferurhobo
doaj   +1 more source

A screening method for ranking chemicals by their fate and behaviour in the environment and potential toxic effects in humans following non-occupational exposure [PDF]

, 2004
A large number of chemicals are released intentionally or unintentionally into the environment each year. These include thousands of substances that are currently listed worldwide and several hundred new substances added annually (Mücke et al., 1986 ...
Capelton, A, Duarte-Davidson, R, Troisi, G   +2 more
core