搜索结果: 151-165 共查到“理学 Nitrogen”相关记录452条 . 查询时间(0.119 秒)
Influence of elevated CO2 concentrations on cell division and nitrogen fixation rates in the bloom-forming cyanobacterium Nodularia spumigena
elevated CO2 concentrations cell division nitrogen fixation rates bloom-forming cyanobacterium
2010/1/21
The surface ocean absorbs large quantities of the CO2 emitted to the atmosphere from human activities. As this CO2 dissolves in seawater, it reacts to form carbonic acid. While this phenomenon, called...
Interactions among vegetation and ozone,water and nitrogen fluxes in a coastal Mediterranean maquis ecosystem
Interactions vegetation ozone water nitrogen fluxes maquis ecosystem
2010/1/20
Ozone, water and energy fluxes were measured over a Mediterranean maquis ecosystem from 5 May until 31 July 2007 by means of the eddy covariance technique. Additional measurements of NOx fluxes were p...
Nitrogen dilution effect for small angle GDH experiment in JLab Hall-A
GDH sum rule dilution factor correction cross section asymmetry
2009/8/14
In the GDH sum rule measurement in JLab Hall-A, to obtain the cross section of electron scattering on polarized 3He and its asymmetry in different helicity states, the dilution effect from unpolarized...
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 (...
Detection of pollution transport events southeast of Mexico City using ground-based visible spectroscopy measurements of nitrogen dioxide
pollution transport events Mexico City nitrogen dioxide
2009/7/23
This work presents ground based differential optical absorption spectroscopy (DOAS) measurements of nitrogen dioxide (NO2) during the MILAGRO field campaign in March 2006 at the Tenango del Aire resea...
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...
Studies of lake environments using stable isotope ratios of nitrogen (δ15N) and carbon (δ13C)
stable isotopes nitrogen carbon lake
2009/7/14
Increasing numbers of studies have recently used stable isotopes of nitrogen (δ15N) and carbon (δ13C) to clarify the source of nutrients in lake water and sediments, the structure and energy flow of f...
Reactive nitrogen in Mexico City and its relation to ozone-precursor sensitivity: results from photochemical models
Reactive nitrogen Mexico City ozone-precursor sensitivity photochemical models
2009/6/16
We use results of a 3-D photochemistry/transport model for ozone formation in Mexico City during events in 1997 to investigate ambient concentrations of reactive nitrogen in relation to ozone-precurso...
Modelling the ecosystem effects of nitrogen deposition：Model of Ecosystem Retention and Loss of Inorganic Nitrogen
nitrogen deposition Ecosystem Retention
2009/6/8
A catchment-scale mass-balance model of linked carbon and nitrogen cycling in ecosystems has been developed for simulating leaching losses of inorganic nitrogen. The model (MERLIN) considers linked bi...
Modelling the response of soil and soil solution chemistry upon roofing a forest in an area with high nitrogen deposition
nitrate (NO3) sulphate (SO4) soil solution chemistry
2009/6/5
In the Speuld forest, the Netherlands, the dynamic soil acidification model NuCSAM has been applied to a manipulation experiment in which part of the forest was roofed to control nitrogen (N) and sulp...
Simulation of the long-term carbon and nitrogen dynamics in Dutch forest soils under Scots pine
long-term carbon Dutch forest soils nitrogen dynamics Scots pine
2009/6/5
Dynamics of C and N in forest soils in the Nutrient Cycling and Soil Acidification Model (NUCSAM) are described by the transformation and decomposition of three organic matter compartments, litter, fe...
Applying MERLIN for modelling nitrate leaching in a nitrogen saturated Douglas fir forest in the Netherlands after decreased atmospheric nitrogen input
refractory organic matter atmospheric nitrogen input nitrate leaching
2009/6/5
The MERLIN model was applied on the results of a field-scale manipulation experiment with decreased nitrogen (N) deposition in an N saturated forest ecosystem in the Netherlands. The aim was to invest...
Nitrogen leaching from N limited forest ecosystems：the MERLIN model applied to Gårdsjön, Sweden
Nitrogen Sweden forest ecosystems
2009/6/5
Chronic deposition of inorganic nitrogen (N) compounds from the atmosphere to forested ecosystems can alter the status of a forest ecosystem from N-limited towards N-rich, which may cause, among other...
油菜氮素光谱定量分析中水分胁迫与光照影响及修正 Effect and Correction of Water Stress and Lighting Factor on Rape Nitrogen Content Spectral Analysis
油菜 含氮量 光照 水分胁迫
2009/5/18
研究了油菜氮素和水分胁迫在光谱检测中的相互作用，以及光照的变化对作物光谱检测的影响。为了克服光照因素对光谱检测的影响，针对氮素和水分的特征波长分别建立了基于光谱反射率变化率的光照修正模型；为了实现对氮素和水分相互作用的解耦，针对不同含水率水平的植株分别建立了全氮含量光谱特征的主成分回归模型。利用氮素光谱组合分析模型对植株全氮含量进行预测，结果表明，实测值与预测值的相关系数R为0.92，均方根误（R...