نتایج جستجو برای: phosphorus efficiency

تعداد نتایج: 427117  

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2014
Lizhu Hou Huan Yang Ming Li

Urban surface water runoff typically contains high but varying amounts of organic matter and nutrients that require removal before reuse. Infiltration systems such as sunken lawns can improve water quality. However, there is currently insufficient information describing the treatment efficiency of lawn-based infiltration systems. In this study, novel sunken lawn infiltration systems (SLISs) wer...

2010
Simon C. Bird

Electric arc furnace (EAF) steel slag filters were investigated for their efficiency at reducing the concentration of phosphorus (P) from dairy farm wastewater in Vermont. The primary objective for this study was to examine the use of in series design on filters’ performance in P removal from dairy farm wastewater at subzero temperatures. Other research objectives were to investigate operationa...

2000
Ritsuko WATANABE Akinari YOKOYA Kimiaki SAITO

The mechanism of DNA strand break induction due to K-shell photoabsorption of DNA constituent phosphorus was studied by computer simulation. Photon induced Auger process in DNA solution was modeled and introduced to the Monte Carlo simulation code DBREAK, which allows the estimation of DNA strand break production on pBR322 plasmid DNA in aqueous solution. The simulation was carried out for the ...

2013
Gangqiang Dong Fengzhen Liu Jing Liu Hailong Zhang Meifang Zhu

A radial p-n junction solar cell based on vertically free-standing silicon nanowire (SiNW) array is realized using a novel low-temperature and shallow phosphorus doping technique. The SiNW arrays with excellent light trapping property were fabricated by metal-assisted chemical etching technique. The shallow phosphorus doping process was carried out in a hot wire chemical vapor disposition chamb...

Journal: :Waste management 2013
Yuliya Kalmykova K Karlfeldt Fedje

The potential of phosphorus (P) recycling from municipal solid waste incineration (MSWI) residue is investigated. Vast and ever increasing amounts of incineration residues are produced worldwide; these are an environmental burden, but also a resource, as they are a major sink for the material flows of society. Due to strict environmental regulations, in combination with decreasing landfilling s...

Journal: :ACS nano 2014
Yexin Deng Zhe Luo Nathan J Conrad Han Liu Yongji Gong Sina Najmaei Pulickel M Ajayan Jun Lou Xianfan Xu Peide D Ye

Phosphorene, a elemental 2D material, which is the monolayer of black phosphorus, has been mechanically exfoliated recently. In its bulk form, black phosphorus shows high carrier mobility (∼10,000 cm(2)/V·s) and a ∼0.3 eV direct band gap. Well-behaved p-type field-effect transistors with mobilities of up to 1000 cm(2)/V·s, as well as phototransistors, have been demonstrated on few-layer black p...

Journal: :FEMS microbiology ecology 2008
Theis Kragh Morten Søndergaard Lars Tranvik

This study reports on the interacting effect of photochemical conditioning of dissolved organic matter and inorganic phosphorus on the metabolic activity of bacteria in freshwater. Batch cultures with lake-water bacteria and dissolved organic carbon (DOC) extracted from a humic boreal river were arranged in an experimental matrix of three levels of exposure to simulated sunlight and three level...

2007
WESTON H. NOWLIN

1. Limnologists have long acknowledged the importance of phosphorus (P) in determining the organism biomass and productivity of lake ecosystems. Despite a relatively large number of studies that have examined P cycling in lake ecosystems, there remain several substantial methodological issues that have impeded our understanding of P cycling in limnetic plankton communities. Two critical issues ...

2008
L. CAO Y. YANG W. M. WANG A. YAKUPITIYAGE D. R. YUAN

This study was to assess effects of the pretreatment in allplant based diets with microbial phytase on phosphorous utilization and growth performance of Nile tilapia (Oreochromis niloticus). Pretreatment trials were conducted using phytase at graded doses to determine the optimal dose of phytase. Available phosphorus (P) levels increased significantly with the increased doses of phytase and the...

Journal: :Journal of environmental quality 2006
Ling Yang Hongde Zhou Richard Moccia

Effluents from recirculating aquaculture systems (RAS) contain high concentrations of nitrogen and phosphorous wastes and thus often require proper treatment to prevent potential detrimental impacts on receiving water bodies. The purpose of this study was to evaluate the feasibility of membrane filtration coupled with chemical precipitation as a pretreatment step with emphasis on phosphorus rem...

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