User profiles for Geoff Klein

geoffrey klein

- Verified email at cnu.edu - Cited by 1830

Geoffrey Klein

- Verified email at unine.ch - Cited by 526

Phenological and elevational shifts of plants, animals and fungi under climate change in the E uropean A lps

Y Vitasse, S Ursenbacher, G Klein… - Biological …, 2021 - Wiley Online Library
Mountain areas are biodiversity hotspots and provide a multitude of ecosystem services of
irreplaceable socio‐economic value. In the European Alps, air temperature has increased at a …

Probing molecular-level transformations of dissolved organic matter: insights on photochemical degradation and protozoan modification of DOM from electrospray …

EB Kujawinski, R Del Vecchio, NV Blough, GC Klein… - Marine Chemistry, 2004 - Elsevier
Molecular-level characterization of natural organic matter (NOM) has been elusive due to the
inherent complexity of natural organic mixtures and to the fact that individual components …

Shorter snow cover duration since 1970 in the Swiss Alps due to earlier snowmelt more than to later snow onset

G Klein, Y Vitasse, C Rixen, C Marty, M Rebetez - Climatic Change, 2016 - Springer
Global warming has strong impacts on snow cover, which in turn affects ecosystems, hydrological
regimes and winter tourism. Only a few long-term snow series are available worldwide…

Mass spectral analysis of asphaltenes. II. Detailed compositional comparison of asphaltenes deposit to its crude oil counterpart for two geographically different crude …

GC Klein, S Kim, RP Rodgers, AG Marshall… - Energy & fuels, 2006 - ACS Publications
Asphaltenes are known to deposit in both the petroleum recovery and topside refining processes.
The asphaltenes are normally in equilibrium under reservoir conditions. As crude oil is …

Use of saturates/aromatics/resins/asphaltenes (SARA) fractionation to determine matrix effects in crude oil analysis by electrospray ionization Fourier transform ion …

GC Klein, A Angström, RP Rodgers, AG Marshall - Energy & fuels, 2006 - ACS Publications
We have previously demonstrated the ability of electrospray ionization Fourier transform ion
cyclotron resonance mass spectrometry (ESI FT-ICR MS) to resolve and identify the polar …

Mass spectral analysis of asphaltenes. I. Compositional differences between pressure-drop and solvent-drop asphaltenes determined by electrospray ionization …

GC Klein, S Kim, RP Rodgers, AG Marshall, A Yen… - Energy & …, 2006 - ACS Publications
Asphaltenes are typically defined by their solubility in benzene and insolubility in pentane
or heptane. They are believed to exist in petroleum crude oil as a colloidal suspension, …

Identification of water-soluble heavy crude oil organic-acids, bases, and neutrals by electrospray ionization and field desorption ionization Fourier transform ion …

LA Stanford, S Kim, GC Klein, DF Smith… - … science & technology, 2007 - ACS Publications
We identify water-soluble (23 C) crude oil NSO nonvolatile acidic, basic, and neutral crude oil
hydrocarbons by negative-ion ESI and continuous flow FD FT-ICR MS at an average mass …

[PDF][PDF] A brief history of fisheries in Canada

…, CT Hasler, KL Howland, JA Hutchings, GM Klein… - Fisheries, 2020 - researchgate.net
Having the longest coastlines in the world and some of the largest freshwater ecosystems,
Canada has a rich history of exploitation and stewardship of its marine and freshwater …

Identification of hydrotreatment-resistant heteroatomic species in a crude oil distillation cut by electrospray ionization FT-ICR mass spectrometry

GC Klein, RP Rodgers, AG Marshall - Fuel, 2006 - Elsevier
The diminishing clean oil reserve is driving the search for new or improved ways to reduce
the level of NSO-containing species found in high abundance in heavy crude oils. …

Crude oil polar chemical composition derived from FT− ICR mass spectrometry accounts for asphaltene inhibitor specificity

DF Smith, GC Klein, AT Yen, MP Squicciarini… - Energy & …, 2008 - ACS Publications
We examine oil-specific asphaltene inhibitor chemistry of two chemically distinct asphaltene
inhibitors. Laboratory and field tests show oil-specific asphaltene inhibitor performance for …