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Development of a Biological Filter Utilizing Organic Growth Media for Wastewater Treatment and Nitrogen Oxidation

Journal of Agricultural Science and Technology(B) 2012年第1期2卷 62-73页

作者： Troy Francis Davis Ronald Erie Sheffield Steven George Hall brian dawson leblanc Chandra SekharTheegala Department of Biological and Agricultural Engineering Louisiana State University AgCenter Baton Rouge 70803 Louisiana70803 United States LSU AgCenter Callegari Environmental Center Baton Rouge 70803 Louisiana 70803 United States

Loss of ammonia-nitrogen to volatilization and the over application of phosphorus in agricultural wastewaters has led to excess phosphorus build up in topsoil and in surface waters. In order to increase the usable amount nitrogen in agricultural wastewaters, the wastewaters underwent a nitrogen treatment process consisting of a hanging basket biological filter. The filters utilized never before used biological growth media, rice hulls, to assist in the formation of a mature biofilms as the oxidation of ammonia to nitrate. The filter design was used on a lab scale that treated both artificial wastewater and dairy parlor wastewater treated with a lime precipitation step for phosphorus treatment. The filters were tested to see if bio-fouling occurred in the filter media bed under high nitrogen loading, if the rice hulls could withstand an extended time frame as bacterial growth media, and to see if the oxidation of ammonia to nitrate would occur. A 50% reduction in ammonia occurred between 30 and 48 hrs in each trial with eventual nitrite oxidation reported in the final two trials. Statistical analysis preformed determined that the ammonia removal rates at the beginning of both the synthetic wastewater and dairy parlor wastewater ten-day tests were statistically similar, but varied toward the end of the trials.

关键词： Wastewater nitrification ammonia biological filter rice hull.

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快速转诊的大量增加改善了英国肠癌患者的预后吗?

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英国医学杂志中文版 2021年第4期24卷 193-196页

作者： Michael Thompson Daniel’Leary Iona Heath Lynn Faulds Wood brian Ellis Karen Flashman Neil Smart John Nicholls Neil Mortensen Paul Finan Asha Senapati Robert Steele Peter dawson James Hill Brendan Moran 白静雯(译) 张国君(校) Queen Alexandra Hospital PortsmouthUK London UK University of Exeter Medical School ExeterUK Imperial College LondonUK John Radcliffe Hospital OxfordUK St James′s University Hospital LeedsUK University of Dundee DundeeUK Manchester University ManchesterUK North Hampshire Hospital BasingstokeUK 厦门大学附属翔安医院肿瘤诊治中心

Michael Thompson及其同事认为,需要更精确的风险分层以确保及时诊断肠癌,同时避免不必要的检查。英国卫生部为了提高肠癌患者的生存率,制定了全科医生转诊指南和公众宣传活动的政策,这些政策增加了紧急转诊到医院的人数,还导致了并无... 详细信息

Michael Thompson及其同事认为,需要更精确的风险分层以确保及时诊断肠癌,同时避免不必要的检查。英国卫生部为了提高肠癌患者的生存率,制定了全科医生转诊指南和公众宣传活动的政策,这些政策增加了紧急转诊到医院的人数,还导致了并无明显临床获益的不必要肠镜检查和CT结肠造影。

关键词：肠癌患者全科医生肠镜检查公众宣传转诊风险分层及时诊断临床获益

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Does Dust from Arctic Mines Affect Caribou Forage?

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Journal of Environmental Protection 2017年第3期8卷 258-276页

作者： Wenjun Chen Sylvain G. leblanc H. Peter White Christian Prevost brian Milakovic Christine Rock Greg Sharam Harry O’Keefe Laura Corey Bruno Croft Anne Gunn Sjoerd van der Wielen Adeline Football Boyan Tracz Jody Snortland Pellissey John Boulanger Canada Centre for Remote Sensing Natural Resources Canada Ottawa Canada ERM Environmental Ressources Management Vancouver Canada Dominion Diamond Ekati Corporation Yellowknife Canada Environment and Natural Resources GNWT Yellowknife Canada Circum Arctic Rangifer Monitoring and Assessment Network Salt Spring Island Canada Tlicho Government Behchoko NT Canada Wek’èezhìi Renewable Resources Board Yellowknife Canada Integrated Ecological Research Ltd. Nelson Canada

This study explores how dust from the Ekati Diamond Mine potentially affects the availability and quality of forage on the seasonal range of the Bathurst caribou herd. Understanding the effects of dust as a source of disturbance is important because the Bathurst caribou population has declined by 93% since the middle 1980s and there are reports that caribou in general may avoid mining projects. There are several challenges for quantifying dust impacts: 1) Natural variations (e.g., topography, natural disturbance, and soil pH) may also impact forage availability and quality for caribou. To minimize their masking effect, we stratified survey sites into seven land cover classes and selected the most populous class (i.e., the dwarf shrub) for assessing the impact. 2) Within class variation (e.g., the proportion of area covered by rocks where vascular plants and lichen do not grow) can further skew the analysis. We eliminated this problem by examining only the area not covered by rocks. 3) Coarse and fine suspended particulates have different spatial coverages, chemical compositions, and pH values. Consequently, their impacts on caribou forage can be different. To distinguish their impacts, we sampled two areas: transects from the Misery Haul Road that has been in active use vs. those from a rarely used spur road outside the Misery Camp. We sampled percent vegetation cover, soil pH, and dust on leaves along these transects during the summers of 2015 and 2016. Our results indicated that the amount of dust on leaves in a zone of ~1000 m from the Misery Haul Road was 3 - 9 times than that of background sites. The zone of reduced lichen percent cover was also about 1000 m. In contrast, these road dust-induced changes in caribou forage were not observed for the dust-free transect from the spur road.

关键词： Mining Arctic Caribou Habitat Road Dust PM2.5 Vegetation Cover Lichen Soil pH Dust Deposition

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Performance and calibration of quark/gluon-jet taggers using 140 fb^(-1) of pp collisions at √s=13 TeV with the ATLAS detector

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Chinese Physics C 2024年第2期48卷 1-25页

作者： G. Aad B. Abbott K. Abeling N.J. Abicht S.H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B.S. Acharya C. Adam Bourdarios L. Adamczyk S.V. Addepalli M.J. Addison J. Adelman A. Adiguzel T. Adye A.A. Affolder Y. Afik M.N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei A. Ahmad F. Ahmadov W.S. Ahmed S. Ahuja X. Ai G. Aielli A. Aikot M. Ait Tamlihat B. Aitbenchikh I. Aizenberg M. Akbiyik T.P.A. Åkesson A.V. Akimov D. Akiyama N.N. Akolkar K. Al Khoury G.L. Alberghi J. Albert P. Albicocco G.L. Albouy S. Alderweireldt M. Aleksa I.N. Aleksandrov C. Alexa T. Alexopoulos F. Alfonsi M. Algren M. Alhroob B. Ali H.M.J. Ali S. Ali S.W. Alibocus M. Aliev G. Alimonti W. Alkakhi C. Allaire B.M.M. Allbrooke J.F. Allen C.A. Allendes Flores P.P. Allport A. Aloisio F. Alonso C. Alpigiani M. Alvarez Estevez A. Alvarez Fernandez M. Alves Cardoso M.G. Alviggi M. Aly Y. Amaral Coutinho A. Ambler C. Amelung M. Amerl C.G. Ames D. Amidei S.P. Amor Dos Santos K.R. Amos V. Ananiev C. Anastopoulos T. Andeen J.K. Anders S.Y. Andrean A. Andreazza S. Angelidakis A. Angerami A.V. Anisenkov A. Annovi C. Antel M.T. Anthony E. Antipov M. Antonelli F. Anulli M. Aoki T. Aoki J.A. Aparisi Pozo M.A. Aparo L. Aperio Bella C. Appelt A. Apyan N. Aranzabal S.J. Arbiol Val C. Arcangeletti A.T.H. Arce E. Arena J-F. Arguin S. Argyropoulos J.-H. Arling O. Arnaez H. Arnold G. Artoni H. Asada K. Asai S. Asai N.A. Asbah J. Assahsah K. Assamagan R. Astalos S. Atashi R.J. Atkin M. Atkinson H. Atmani P.A. Atmasiddha K. Augsten S. Auricchio A.D. Auriol V.A. Austrup G. Avolio K. Axiotis G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea P. Bagnaia M. Bahmani A.J. Bailey V.R. Bailey J.T. Baines L. Baines O.K. Baker E. Bakos D. Bakshi Gupta V. Balakrishnan R. Balasubramanian E.M. Baldin P. Balek E. Ballabene F. Balli L.M. Baltes W.K. Balunas J. Balz E. Banas M. Bandieramonte A. Bandyopadhyay S. Bansal L. Barak M. Barakat E.L. Barberio D. Barberis M. Barbero M.Z. Barel K.N. Barends T. Barillari M-S. Barisits T. Barklow P. Baron D.A. Baron Mo The ATLAS Collaboration

The identification of jets originating from quarks and gluons,often referred to as quark/gluon tagging,plays an important role in various analyses performed at the Large Hadron Collider,as Standard Model measurements and searches for new particles decaying to quarks often rely on suppressing a large gluon-induced *** paper describes the measurement of the efficiencies of quark/gluon taggers developed within the ATLAS Collaboration,using √s=13 TeV proton–proton collision data with an integrated luminosity of 140 fb^(-1) collected by the ATLAS *** taggers with high performances in rejecting jets from gluon over jets from quarks are studied:one tagger is based on requirements on the number of inner-detector tracks associated with the jet,and the other combines several jet substructure observables using a boosted decision tree.A method is established to determine the quark/gluon fraction in data,by using quark/gluon-enriched subsamples defined by the jet *** in tagging efficiency between data and simulation are provided for jets with transverse momentum between 500 GeV and 2 TeV and for multiple tagger working points.

关键词： ATLAS JET QUARK GLUON TAGGING

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