搜索结果: 1-15 共查到“地质学 Nitrogen”相关记录22条 . 查询时间(0.131 秒)
PEATBOG: a biogeochemical model for analyzing coupled carbon and nitrogen dynamics in northern peatlands
analyzing coupled carbon nitrogen dynamics
2014/12/12
Elevated nitrogen deposition and climate change
alter the vegetation communities and carbon (C) and nitrogen (N) cycling in peatlands.
Stepwise combustion analyses of distinct nitrogen isotopic compositions on Paleoproterozoic organic matter
nitrogen isotopic composition Paleoproterozoic stepwise combustion method kerogen Gunflint Formati
2017/4/11
Nitrogen isotopic analyses were conducted on two kerogenous samples from the Gunflint Formation (ca. 1.9 Ga)
using the stepwise combustion technique to evaluate a potential analytical problem for the...
XRF and nitrogen adsorption studies of acid-activated palygorskite
palygorskite, micropore, mesopore, macropore, acid activation, X-ray fluorescence, BET, HCl,
2011/11/3
The effects of acid activation on the chemical composition, surface area and pore structure of palygorskite from Xuyi (Jiangsu, P.R. China) were investigated systematically using X-ray fluorescence (X...
XRF and nitrogen adsorption studies of acid-activated palygorskite
palygorskite micropore mesopore macropore acid activation X-ray fluorescence BET HCl H2SO4 H3PO4
2011/12/14
The effects of acid activation on the chemical composition, surface area and pore structure of palygorskite from Xuyi (Jiangsu, P.R. China) were investigated systematically using X-ray fluorescence (X...
Preliminary Identification of Ground-water Nitrate Sources Using Nitrogen and Carbon Stable Isotopes,Kansas
Preliminary Identification Ground-water Nitrate Sources Nitrogen and Carbon Stable Isotopes
2009/10/20
Increasing nitrate-N in ground water is a problem in many areas with limited ground-water supplies, such as west-central Kansas. However, potential sources of nitrate-N are not known. Nitrate-N concen...
Nitrogen and N-isotope variation during low-grade metamorphism of the Taiwan mountain belt
nitrogen isotope devolatilization subduction zone Taiwan
2017/8/9
To investigate factors affecting the evolution of nitrogen system in rocks during progressive metamorphism, unmetamorphosed to greenschist-facies pelitic samples were collected from both pelitic and (...
Fast removal of ammonium nitrogen from aqueous solution using chitosan-g-poly(acrylic acid)/attapulgite composite
Ammonium nitrogen Composite adsorbent Kinetics Isotherms Adsorption mechanism
2011/10/10
In thiswork, a novelcomposite adsorbent with three-dimensional cross-linked polymeric networks based on chitosan (CTS) and attapulgite (APT) was prepared via in situ copolymerization in aqueous soluti...
Fast removal of ammonium nitrogen from aqueous solution using chitosan-g-poly(acrylic acid)/attapulgite composite
Ammonium nitrogen Composite adsorbent Kinetics Isotherms Adsorption mechanism
2011/12/14
In thiswork, a novelcomposite adsorbent with three-dimensional cross-linked polymeric networks based on chitosan (CTS) and attapulgite (APT) was prepared via in situ copolymerization in aqueous soluti...
Nitrogen cycling in a deep ocean margin sediment (Sagami Bay, Japan)
Nitrogen cycling deep ocean margin sediment Sagami Bay Japan
2014/4/18
On the basis of in situ NO3-1 microprofiles and chamber incubations complemented by laboratory-based assessments of anammox and denitrification we evaluate the nitrogen turnover of an ocean margin sed...
High sensitivity measurements of nitrogen isotopic ratios in coral skeletons from Palau, western Pacific: Temporal resolution and seasonal variation of nitrogen sources
coral skeleton δ15N value δ18O value δ13C value seasonal variation
2017/8/10
By using a step-wise heating method in conjunction with static vacuum mass spectrometry, we have measured at high temporal resolution (one month) the nitrogen isotopic ratio of a coral skeletal sample...
15 N Isotope Used for Study of Groundwater Nitrogen Pollution in Shijiazhuang City，China
2007/12/12
AbstractShijiazhuang City is the capital of Hebei province，China．Groundwater is the major water supply source for living and industry need of the city．Due to arapid increase of population and developm...
Experiments linking nitrogenase gene expression to nitrogen fixation in the North Pacific subtropical gyre
Experiments linking nitrogenase gene expression nitrogen fixation North Pacific subtropical gyre
2014/4/22
We examined diazotroph activity in controlled experiments containing natural populations of nitrogen (N2)- fixing microbes collected offshore from Kane’ohe Bay, Hawai’i, and from Station ALO...
High-resolution profiles and nitrogen isotope tracing reveal a dominant source of nitrous oxide and multiple pathways of nitrogen gas formation in the central Arabian Sea
High-resolution profiles nitrogen isotope tracing reveal dominant source of nitrous oxide multiple pathways nitrogen gas formation in the central Arabian Sea
2014/4/22
The oxygen minimum zone (OMZ) of the Arabian Sea is a significant source of nitrous oxide (N2O), yet the metabolism responsible for N2O production is unclear. High-resolution profiles identified peaks...
Nitrogen-isotope record of fluid-rock interactions in the Skiddaw Aureole and granite, English Lake District
Nitrogen-isotope record fluid-rock interactions Skiddaw Aureole granite English Lake District
2012/4/1
The Skiddaw Granite and its contact metamorphic aureole in the English Lake District provide an
excellent opportunity to test the capability of the N-isotope system to trace devolatilization and larg...
Characterization of Tubular Chrysotile by Thermoporometry, Nitrogen Sorption, Drifts, and TEM
Chrysotile asbestos Infrared spectroscopy N2 adsorption and desorption Thermoporometry Transmission electron microscopy X-ray diffraction
2011/12/30
The maximum crystal radius Rn of ice in hollow wet chrysotile tubes is established by thermoporometry to be between 2.8 and 3.2 nm, and the internal pore volume Vn of the tubes to be between 0.008 and...