搜索结果: 136-150 共查到“理学 Hydrogen”相关记录234条 . 查询时间(0.018 秒)
Hydrogen isotopic fractionation in lipid biosynthesis by H2 -consuming Desulfobacterium autotrophicum
lipid biosynthesis Hydrogen isotopic fractionation
2014/4/8
We report hydrogen isotopic fractionations between water and fatty acids of the sulfate-reducing bacterium Desulfobacterium autotrophicum. Pure cultures were grown in waters with deuterium (D) content...
ON DETERMINATION OF THE COSMIC RAY FLUX USING MOLECULAR HYDROGEN ABSORPTION LINES
Molecular processes-SM molecules-quasars absorption lines
2009/3/11
We outline a procedure for estimating the cosmic ray flux at remote
locations where molecular hydrogen absorption lines have been detected. The
method relies on several assumptions whose validity in...
We report measurements of the deuterium content of molecular hydrogen (H2) obtained from a suite of air samples that were collected during a stratospheric balloon flight between 12 and 33 km at 40&ord...
The annual cycle of hydrogen peroxide:an indicator of chemical instability?
hydrogen peroxide chemical instability
2009/2/27
A box model has been used to study the annual cycle in hydrogen peroxide concentrations with the objective of determining whether the observed difference in summer and winter values reflects instabili...
The overwhelming role of soils in the global atmospheric hydrogen cycle
soil global atmospheric hydrogen cycle molecular hydrogen
2009/1/7
The removal of molecular hydrogen (H2) from the atmosphere is dominated by the uptake in soils. Notwithstanding, estimates of the magnitude of this important process on a global scale are highly uncer...
The tropospheric processing of acidic gases and hydrogen sulphide in volcanic gas plumes as inferred from field and model investigations
tropospheric processing acidic gases hydrogen sulphide volcanic gas plumes
2008/12/3
Improving the constraints on the atmospheric fate and depletion rates of acidic compounds persistently emitted by non-erupting (quiescent) volcanoes is important for quantitatively predicting the envi...
Atmospheric hydrogen peroxide and organic hydroperoxides during PRIDE-PRD'06, China: their concentration, formation mechanism and contribution to secondary aerosols
Atmospheric hydrogen peroxide organic hydroperoxides China formation mechanism secondary aerosols
2008/11/26
Atmospheric hydrogen peroxide (H2O2) and organic hydroperoxides were measured from 18 to 30 July in 2006 during the PRIDE-PRD'06 campaign at Backgarden, a rural site located 48 km north of Guangzhou, ...
Aerobic hydrogen production and dinitrogen fixation in the marine cyanobacterium Trichodesmium erythraeum IMS101
Aerobic hydrogen production dinitrogen fixation the marine cyanobacterium Trichodesmium erythraeum IMS101
2014/4/21
Rates of hydrogen production and acetylene reduction were measured in aerobic cultures of the marine cyanobacterium Trichodesmium erythraeum IMS101 grown in a supplemented seawater medium low in combi...
Hydrogen isotope fractionation in the photolysis of formaldehyde
Hydrogen isotope fractionation in the photolysis of formaldehyde
2008/10/31
Experiments investigating the isotopic fractionation in the formation of H2 by the photolysis of CH2O under tropospheric conditions are reported and discussed. The deuterium (D) depletion in the H2 pr...
Hydrogen isotope ratios of terrigenous n-alkanes in lacustrine surface sediment of the Tibetan Plateau record the precipitation signal
n-alkanes lacustrine sediment terrestrial origin hydrogen isotope ratio precipitation climate
2017/8/10
Hydrogen isotope ratios were measured on terrigenous alkanes (n-C25 to n-C31) extracted from recent lake surface sediments from the climatically and environmentally distinct basins Qiangyong Glacier L...
A Hydrogen Ion-Selective Poly(Vinyl Chloride) Membrane Electrode Based on Calix[4]arene as a Perchlorate Ion-Selective Electrode
Calix[4]arene perchlorate PVC membrane ion-selective electrode potentiometry
2010/4/16
A hydrogen ion-selective electrode was prepared using 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetracyanometoxy-calix[4]arene and the possibility of its use as a perchlorate ion-selective electrode wa...
Anomalous Strong Reflections on High Resolution Seismic Data from the Turkish Shelf of the Eastern Black Sea:Possible Indicators of Shallow Hydrogen Sulphide-Rich Gas Hydrate Layers
Black Sea gas hydrate hydrogen sulphide high-resolution acoustic methods
2010/1/11
Some strong reflections about 3 to 5 m thick were observed at depths of 25-60 metres below the sea floor using deep-towed, 5 kHz subbottom profiler data in the Turkish shelf and upper slope of the Eas...
Partial Regeneration of Ni-Based Catalysts for Hydrogen Production via Methane Cracking
Methane cracking hydrogen filamentous carbon partial regeneration Ni/g-Al2O3 catalyst
2010/4/16
Methane cracking has the potential to produce high purity, carbon monoxide-free hydrogen suitable for application in PEM fuel cells. The 2 products of the reaction are molecular hydrogen and solid car...
报告地点:大连化物所生物楼学术报告厅
报告时间:2007年1月8日 上午9:00-10:30
报告人简介:John R. Grace教授于1965年毕业于加拿大University of Western Ontario,获学士学位,1968年在英国剑桥...
Dinuclear Molybdenum Tetracarbonyl Complexes of Tetradentate Nitrogen Ligands and Intermolecular Hydrogen Bonding in the Crystal Structure of N,N´-bis-[1-(pyridin-2-yl)ethylidene]-ethane-1,2-diamine
Dinuclear intermolecular H-bonding molybdenum polyimines Schiff base tetracarbonyl
2010/4/8
Multidentate N-ligands (Schiff bases) were prepared by the condensation of 2-acetylpyridine or 2-benzoylpyridine, and 1,2-diaminoethane or 1,6-diaminohexane (2:1 ratio) in ethanol. These ligands were ...