Results 101 to 110 of about 572,691 (264)

Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration

, 2017
Rising ocean temperatures over the last several decades have led to an accelerated rate of sea ice decline in the northern latitudes. This study is motivated by a need to accurately model and predict sea ice dynamics in a rapidly changing climate.
McGehee, Rebecca
core   +1 more source

Compositional Stages in the Thermal Activation of Metal‐Organic Frameworks in Vacuo: In Situ Spectroscopy and Computation

Chemistry – A European Journal, EarlyView.
The ultrahigh surface area intrinsic to many metal‐organic frameworks (MOFs) may only be accessed after the removal of synthesis solvent from within the pores. This study elucidates the electronic and structural changes undergone through the guest removal process within a commonly used CUS MOF.
George W. Fritze, John W. Robinson, Adam J. Matzger   +2 more
wiley   +1 more source

Identifying recharge areas for the upstream portion aquifers of Awash Basin, Ethiopia

Journal of Hydrology: Regional Studies
Study area: The western and eastern flanks of Ethiopia's Awash and Abay Basins, respectively. Study focus: Identifying recharge zones of the main aquifers in the Upper Awash Basin, which are water resources targeted for long-term sustainable use. In this
Ephrem Tadesse, Tilahun Azagegn, Taye Alemayehu   +2 more
doaj   +1 more source

Exploring the Catalytic Activity of Ge(II) and Sn(II) Cationic Crown Ether Complexes: Hydrosilylation

Chemistry – A European Journal, EarlyView.
Easily synthesized [Ge([12]crown‐4)2][OTf]2 catalyzes the hydrosilylation of aldehydes to give reductively coupled ethers via a carbonyl‐activated reaction pathway. The mechanism proceeds through two distinct steps: hydrosilylation followed by etherification. The open coordination face of the active cationic Ge(II) catalyst facilitates the coordination
Sarah L. McOnie, Johanna M. Blacquiere, Kim M. Baines   +2 more
wiley   +1 more source

Selective Formation of a 1,2‐Diborane(4) and Alcohol‐Driven B─B Bond Cleavage to Generate H2

Chemistry – A European Journal, EarlyView.
Diborane(4) chemistry reveals unusual reactivity of electron‐deficient p‐block compounds. Reaction of B2Cat2 (Cat = benzene‐1,2‐diolate) with mesityllithium (MesLi; Mes = 2,4,6‐trimethylphenyl) gives a rare 1,2‐diborane(4) featuring a catecholate ligand. Alcoholysis cleaves the B─B bond and ultimately generates H2.
Rayni P. Noriega, David J. Nelson, Marcus W. Drover   +2 more
wiley   +1 more source

Deuterium-excess as a tracer to determine lake-water contributions along a river

Hydrology Research
Lakes are important landscape elements and sources of streamflow in many catchments. Yet how water storage in lakes and other landscape elements affect streamflow remains poorly understood. We collected weekly water samples from a throughflow lake, along
Benjamin M.C. Fischer, Alexandra Chevrolet, Ilja van Meerveld, Jan Seibert   +3 more
doaj   +1 more source

Photochemical Generation and Spectroscopic Characterization of Parent 3‐Iminooxetane and 3‐Oxazoline From 3‐Azidooxetane

Chemistry – A European Journal, EarlyView.
Two previously uncharacterized heterocyclic imines, 3‐iminooxetane and 3‐oxazoline, are generated simultaneously by irradiation of 3‐azidooxetane under matrix isolation conditions. The infrared spectra provide reference data for future gas‐phase studies and may facilitate their search in the interstellar medium.
Mika Maehara, Christian Thiehoff, Olga Vorobyova, Adrián Portela‐González, André K. Eckhardt   +4 more
wiley   +1 more source

Influence of moisture source and transport on deuterium excess of fresh snow samples at Neumayer Station, Antarctica

, 2022
The correct interpretation of climate proxies, such as water stable isotope signals in firn and ice cores necessitates a good understanding of the moisture sources and transport paths that lead to precipitation.
Udina, Benjamin Mark
core   +1 more source

The relationship of δD and δ18O in soil water and its implications for soil evaporation across distinct rainfall years in winter wheat field in the North China Plain

Agricultural Water Management
Soil evaporation plays a key role in regulating local climate and water loss. Stable isotope ratios of water (²H/¹H and ¹⁸O/¹⁶O) are effective tracers for studying water flux. This study examines three isotope-based indicators deuterium excess (d-excess),
Abdoul Kader Mounkaila Hamani, Junming Liu, Zhuanyun Si, Djifa Fidele Kpalari, Guangshuai Wang, Yang Gao, Xiaotang Ju   +6 more
doaj   +1 more source

Updated facility‐level inventory and LCIA of the public electricity grid in Ontario, Canada

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract As the composition of Ontario's electricity grid will change over time, it is important to have a comprehensive understanding of the environmental impacts of Ontario's electricity grid as it stands today. However, publicly available information on impacts of Ontario's electricity grid is available only in aggregate from government sources.
Jamie Rose, Thomas A. Adams II, Giancarlo Dalle Ave   +2 more
wiley   +1 more source