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Biological Removal of Nitrogen Compounds at a Coke-Oven Effluent Stream

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Journal of Water Resource and Protection 2012年第6期4卷 400-406页

作者： Stig Morling Niclas Astrand Ann-kristin Lidar Sweco Environment StockholmSweden SSAB Oxelosund OxelosundSweden

The steel company SSAB in Oxel?sund, Sweden operates a coke-oven plant and has since a long time operated an activated sludge plant for treatment of effluent water. Along with more stringent requirements on discharge quality, especially focusing on nitrogen compounds and a new consent value for total nitrogen discharge (< 30 ppm of total N) the company decided to operate a pilot plant facility to investigate two major issues: 1) To define the conditions and restrictions for nitrification of ammonia nitrogen in the water;2) To find out how efficiently a denitrification would perform. In order to find answers to these questions SSAB hired a pilot plant for testing. The test facility is based on a single sludge activated sludge reactor system for biological nutrient removal, with a reactor volume of 3.8 m3. After a test period of 5 months it was possible to draw reliable conclusions regarding the performance. The untreated wastewater has a high content of total nitrogen, around 240 ppm. The major nitrogen part is ammonia nitrogen, but an important fraction is found as thiocyanate nitrogen. The following main conclusions were drawn from the test operation: · It was found to be crucial that the solids retention time (SRT) was kept at a sufficiently high level. During the successful operation the SRT was in the range of 40 - 50 days;· It is desirable to have an equalization basin upstream the main biological reactor to meet short time peak loads, defined as both flow and pollution;· The major toxic risks for the biological process were high thiocyanate and ammonia concentrations in the raw wastewater;· The system showed however a good microbiological capacity to acclimatize to the prevailing conditions after the needed time;· The tests did not include an optimization of the oxygen supply with respect to nitrification;however it was evident that the oxygen level was sufficient to maintain a complete nitrification at normal operating conditions;· Once the nitrification was

关键词： Single Stage Activated Sludge Pilot Plant Nitrification Coke-Oven Plant Toxicity Risks Solids Retention Time

Active learning for accelerated design of layered materials

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npj Computational Materials 2018年第1期4卷 54-62页

作者： Lindsay Bassman Pankaj Rajak Rajiv K.Kalia Aiichiro Nakano Fei Sha Jifeng Sun David J.Singh Muratahan Aykol Patrick Huck kristin Persson Priya Vashishta Collaboratory for Advanced Computing and Simulations University of Southern CaliforniaLos AngelesCA 90089USA Department of Physics and Astronomy University of Southern CaliforniaLos AngelesCA 90089USA Department of Chemical Engineering and Material Science University of Southern CaliforniaLos AngelesCA 90089USA Department of Computer Science University of Southern CaliforniaLos AngelesCA 90089USA Department of Biological Sciences University of Southern CaliforniaLos AngelesCA 90089USA Department of Physics and Astronomy University of MissouriColumbiaMO 65211-7010USA Lawrence Berkeley National Laboratory 1 Cyclotron RoadBerkeleyCA 94720USA

Hetero-structures made from vertically stacked monolayers of transition metal dichalcogenides hold great potential for optoelectronic and thermoelectric *** of the optimal layered material for specific applications necessitates the estimation of key material properties,such as electronic band structure and thermal transport ***,screening of material properties via brute force ab initio calculations of the entire material structure space exceeds the limits of current computing ***,the functional dependence of material properties on the structures is often complicated,making simplistic statistical procedures for prediction difficult to employ without large amounts of data ***,we present a Gaussian process regression model,which predicts material properties of an input hetero-structure,as well as an active learning model based on Bayesian optimization,which can efficiently discover the optimal hetero-structure using a minimal number of ab initio *** electronic band gap,conduction/valence band dispersions,and thermoelectric performance are used as representative material properties for prediction and *** Materials Project platform is used for electronic structure computation,while the BoltzTraP code is used to compute thermoelectric *** optimization is shown to significantly reduce the computational cost of discovering the optimal structure when compared with finding an optimal structure by building a regression model to predict material *** models can be used for predictions with respect to any material property and our software,including data preparation code based on the Python Materials Genomics(PyMatGen)library as well as python-based machine learning code,is available open source.

关键词： Active Python python

The Use of Point-of-Care Ultrasound in Acute Kidney Injuries

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Open Journal of Internal Medicine 2022年第1期12卷 1-12页

作者： kristin N. Sheehan Christopher T. Kelly Department of Internal Medicine Wake Forest School of Medicine Winston-Salem NC USA

Acute kidney injuries (AKI) are a common problem encountered by internists in the inpatient and outpatient setting. Uncovering the etiology becomes important in tailoring treatment. Point-of-care ultrasound (POCUS), when used in conjunction with a patient’s history and physical exam, can quickly identify if hydronephrosis is present and shed light on the underlying etiology. In this article, we discuss how incorporating POCUS into the initial assessment of patients with an AKI can reduce the number of unnecessary and expensive formal renal ultrasounds and potentially expedite clinically appropriate treatment. The purpose of this review is to examine the benefits, reliability, and feasibility of POCUS to further evaluate and manage patients with AKI. An extensive review of the literature was performed and found POCUS to be a reliable and realistic method for internists to incorporate into their assessment of patients with AKI. In this article, we also provide instruction on how to perform a POCUS exam of the kidneys and how to identify hydronephrosis. Furthermore, we discuss the challenges we face and ideas for further practice including the emergence of hand-held ultrasounds.

关键词： POCUS Acute Kidney Injury Renal Ultrasound Hydronephrosis

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图坦卡蒙死亡之谜

疯狂英语（初中天地） 2008年第2期 50-51页

作者： kristin Baird Rattini KC

图坦卡蒙法老的军队刚刚输掉了一场重要的战役;他的国家可能会遭受可怕的瘟疫。这位埃及法老或许连晚上睡觉也思绪万千。突然,有个人从黑影中跳出来,朝法老的后脑打出致命一击。图坦卡蒙十年的统治就这样仓促离奇地结束了。

关键词：图坦卡蒙木乃伊

A flexible and scalable scheme for mixing computed formation energies from different levels of theory

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npj Computational Materials 2022年第1期8卷 1857-1867页

作者： Ryan S.Kingsbury Andrew S.Rosen Ayush S.Gupta Jason M.Munro Shyue Ping Ong Anubhav Jain Shyam Dwaraknath Matthew K.Horton kristin A.Persson Department of Materials Science and Engineering University of California BerkeleyBerkeleyCA94720USA Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Materials Science Division Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Miller Institute for Basic Research in Science University of CaliforniaBerkeleyCA94720USA University of California San Diego La JollaCA92093USA Molecular Foundry Lawrence Berkeley National LaboratoryBerkeleyCA94720USA

Computational materials discovery efforts are enabled by large databases of properties derived from high-throughput density functional theory(DFT),which now contain millions of calculations at the generalized gradient approximation(GGA)level of *** is now feasible to carry out high-throughput calculations using more accurate methods,such as meta-GGA DFT;however recomputing an entire database with a higher-fidelity method would not effectively leverage the enormous investment of computational resources embodied in existing(GGA)***,we propose here a general procedure by which higher-fidelity,low-coverage calculations(e.g.,meta-GGA calculations for selected chemical systems)can be combined with lower-fidelity,high-coverage calculations(e.g.,an existing database of GGA calculations)in a robust and scalable *** then use legacy PBE(+U)GGA calculations and new r2SCAN meta-GGA calculations from the Materials Project database to demonstrate that our scheme improves solid and aqueous phase stability predictions,and discuss practical considerations for its implementation.

关键词： theory scheme theory

Update on the Development of Anti-Viral Agents Against Hepatitis C

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Journal of Clinical and Translational Hepatology 2013年第1期1卷 9-21页

作者： kristin L. MacArthur Robert Smolic Martina V. Smolic Catherine H. Wu George Y. Wu Department of Medicine Beth Israel Deaconess Medical Center Boston MA02215 Faculty of Medicine Osijek Croatia University of Connecticut Health Center Farmington CT USA Department of Medicine Division of Gastroenterology-Hepatology University of Connecticut Health Center Farmington CT USA

Hepatitis C virus (HCV) infects nearly 170 million people worldwide and causes chronic hepatitis, cirrhosis, and hepatocellular carcinoma. The search for a drug regimen that maximizes efficacy and minimizes side effects is quickly evolving. This review will discuss a wide range of drug targets currently in all phases of development for the treatment of HCV. Direct data from agents in phase Ⅲ/Ⅳ clinical trials will be presented, along with reported side-effect profiles. The mechanism of action of all treatments and resistance issues are highlighted. Special attention is given to available trial data supporting interferon-free treatment regimens. HCV has become an increasingly important public health concern, and it is important for physicians to stay up to date on the rapidly growing novel therapeutic options.

关键词： HCV Protease Polymerase Triple therapy Drug.

北极虾在不同冷藏条件下的质量变化与质量指标(英文)

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水产学报 2005年第1期29卷 87-96页

作者：曾庆祝,kristin Anna Thorarinsdottir,Guerun Olafsdottir 大连水产学院食品工程系冰岛渔业实验室冰岛渔业实验室辽宁大连　116023 雷克雅瑞克　101 雷克雅瑞克　101

采用感官评估、物理、化学、微生物分析方法,对贮藏在不同冷藏条件下的北极虾的质量变化与质量指标进行了研究。保藏方法分别为传统冰块冷却法、液态冰冷却法、盐水-冰混合冷却剂法,贮藏环境温度为-1.5℃或1.5℃。研究结果表明,液态冰... 详细信息

采用感官评估、物理、化学、微生物分析方法,对贮藏在不同冷藏条件下的北极虾的质量变化与质量指标进行了研究。保藏方法分别为传统冰块冷却法、液态冰冷却法、盐水-冰混合冷却剂法,贮藏环境温度为-1.5℃或1.5℃。研究结果表明,液态冰冷藏法对延缓虾腐败变质的效果比传统冰块冷藏法、盐水-冰混合冷却剂冷藏法好。经过1d的贮藏后发现,无论在-1.5℃还是1.5℃的环境温度下,保藏在液态冰中虾的挥发性总氮(TVB N)都有所下降,并且在-1.5℃的环境温度下,其TVB N值在3d后才回升到刚开始贮藏时的水平,而在其它保藏方法中,虾的TVB N值始终随贮藏时间的延长而增加;除保藏在液态冰-1.5℃环境中虾的三甲胺(TMA)在贮藏的第1天有所降低以外,其它各试验组虾的TMA值均随贮藏时间的延长而增加。检测结果还表明,保藏在传统冰块及盐水-冰混合冷却剂中虾的细菌总数(TVC)增加最快,其次是保藏在液态冰中1.5℃的环境下。而保藏在液态冰中-1.5℃的环境下,虾的细菌繁殖最慢,并且在贮藏初期,产生了明显的细菌总数降低及细菌繁殖被抑制的现象。采用主要因子分析(PCA)和方差分析(ANOVA)发现,质量指标如TVB N、TMA、TVC、pH、NH3(电子鼻测量值)和感官评估结果等相互之间存在着良好的相关性。

关键词：北极虾液态冰过冷电子鼻感官评估腐败

Urban Forest and Tree Valuation Using Discounted Cash Flow Analysis: Impact of Economic Components

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Open Journal of Forestry 2012年第3期2卷 174-181页

作者： kristin S. Peterson Thomas J. Straka School of Agricultural Forest and Environmental Sciences Clemson University Clemson USA

Discounted cash flow analysis is one of the standard methods used to value urban forests and trees. It involves calculating today’s value for all benefits and costs attributed to an investment;that is discounting all cash flows to today’s value using an appropriate interest rate. This requires each benefit and cost be stated in terms of its cash flow. Urban tree benefits are complex. Little notice is given to the components of these benefits. Total urban tree benefits are a summation of partial benefits, including property value increase, storm water reduction, air quality improvement, carbon sequestration, natural gas savings, and electricity savings. We discuss the nature of these partial benefits, especially the geographical, temporal, diameter size, and rate of growth differences. These differences are even reflected in nursery stock valuation. Net present value analysis is used to illustrate the impact of these differences on financial return. An understanding of these components will prove valuable to those attempting to estimate urban forest and tree benefits.

关键词： Urban Forest Benefits Costs Economic Components Discounted Cash Flow Analysis Arboriculture

Fly Ash for Removal of Contaminates from Coal Mine Drainage

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Natural Science 2016年第9期8卷 397-402页

作者： Shadi Abu-Baker Shahrokh Ghaffari Lucy Egdell kristin Haser College of Arts and Sciences Ohio University Zanesville Zanesville USA

In this study, fly ash obtained from a coal burning power plant was used to remove iron from coal mine drainage as well as raising the pH to acceptable limits for natural water using column chromatography. The results of this study indicate that fly ash has the ability to completely remove iron and reduce acidity of coal mine water drainage. This approach can be extended to include other contaminants such as magnesium.

关键词： Fly Ash Coal Mine Water Contamination Reduction Iron Contamination