检索结果-南通市图书馆

Journal of Water Resource and Protection 2017年第10期9卷 1169-1183页

作者： Charlie L. martin Jr. Clayton J. Clark ii Water/Wastewater Department Graceville USA Department of Civil and Environmental Engineering Florida A & m University Tallahassee Tallahassee USA

A Florida wastewater treatment facility studied how Simultaneous Nitrification Denitrification (SND) coupled with traditional nitrogen removal would be used to meet the state’s current advanced wastewater treatment nutrient criterion. This study examined the effect of these combined processes on the fate and transport of the nitrogen species during the treatment process. The effectiveness of nitrogen removal within the full scale sequential batch reactor system (SBR) and the extent of SND compared to nitrification and denitrification in the nitrogen removal process was also evaluated. Finally, the overall performance of the municipal wastewater treatment facility utilizing these combined processes was evaluated. Overall, this application reduced the total nitrogen to almost 6% of the permitted concentration of 3.0 mg/L. The combination of both processes also resulted in an actual ?concentration 93.7% lower than the acceptable theoretical ?concentration, which also resulted in effluent Total Inorganic Nitrogen nearly 80% lower than the permitted 3.0 mg/L effluent concentration. Further, the process produced a composite Total Nitrogen concentration that was 74% lower than the permitted concentration. This coupling of SND with traditional nitrogen removal resulted in a highly effective process to reduce nitrogen in the municipal wastewater effluent which is also attractive for potential implementation due to the low cost expenditure incurred in its utilization.

关键词： Nitrogen Simultaneous Nitrification Denitrification (SND) Wastewater Treatment Full Scale Facility

Preliminary Analyses of Controlled Release of Potassium Permanganate Encapsulated in Polycaprolactone

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2021年第1期13卷 32-43页

作者： Niya S. King Stephanie Luster-Teasley Clayton J. Clark ii Department of Civil and Environmental Engineering Florida A & M University FAMU-FSU College of Engineering Tallahassee FL USA Department of Civil Architectural and Environmental Engineering North Carolina A & T State University Greensboro NC USA

Potassium permanganate (KmnO4) has been used widely as an oxidant for remediation of contaminated soil and water systems. The present study evaluates the release of this oxidant from Polycaprolactone (PCL) polymer as part of a patented controlled release process (CRP) to be applied for targeted removal of contaminants from water. KmnO4 was encapsulated into PCL at a 1:5 oxidant to polymer ratio and placed in batch reactor systems with reagent water to be evaluated over a 96 hour period. SEm images showed that over time, the number of cavities and their sizes increased on the waxy surface of the PCL polymer. The experimental data from the release of KmnO4 from PCL was found to fit non-Fickian diffusion model after dissolution (R2 = 0.93) similar to other systems that describe the dispersal of other oxidants from wax matrices. In addition, the model parameters for data of this present study were also found to be comparable to previous release studies with the same oxidant encapsulated in different wax matrices at similar ratios. Overall, the similarity of release data between the diversity of polymers shows that the controlled release biodegradable polymer utilizing PCL provides effective release of the KmnO4 with the added benefit biodegradable nature of PCL.

关键词： Potassium Permanganate Controlled-Release Encapsulation Kinetics

Functional correlates of skull shape in Chiroptera:feeding and echolocation adaptations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2022年第3期17卷 430-442页

作者： Giada GIACOmINI Anthony HERREL Gloriana CHAVERRI richard P.BROWN Danilo RUSSO Dino SCARAVELLI Carlo mELORO Research Centre in Evolutionary Anthropology and Palaeoecology School of Biological and Environmental SciencesLiverpool John Moores UniversityUK Département d’Ecologie et de Gestion de Paris C.N.R.S/M.N.H.N.ParisFrance Recinto de Golfito Universidad de Costa RicaGolfitoCosta Rica Smithsonian Tropical Research Institute BalboaAncónRepública de Panamá Wildlife Research Unit Dipartimento di AgrariaUniversitàdegli Studi di Napoli Federico IIPorticiItaly School of Biological Sciences Life Sciences BuildingUniversity of BristolBristolUK Department of Veterinary medical Sciences University of BolognaOzzano dell’EmiliaItaly

morphological,functional,and behavioral adaptations of bats are among the most diverse within mammals.A strong association between bat skull morphology and feeding behavior has been suggested ***,morphological variation related to other drivers of adaptation,in particular echolocation,remains *** assessed variation in skull morphology with respect to ecology(diet and emission type)and function(bite force,masticatory muscles and echolocation characteristics)using geometric morphometrics and comparative *** study suggests that variation in skull shape of 10 bat families is the result of adaptations to broad dietary categories and sound emission types(oral or nasal).Skull shape correlates with echolocation parameters only in a subsample of insectivorous species,possibly because they(almost)entirely rely on this sensory system for locating and capturing *** emitting low frequencies are characterized by a ventrally tilted rostrum,a trait not associated with feeding *** result questions the validity of a trade-off between feeding and echolocation *** study advances understanding of the relationship between skull morphology and specific features of echolocation and suggests that evolutionary constraints due to echolocation may differ between different groups within the Chiroptera.

关键词： diet echolocation functional morphology geometric morphometrics macroevolution

Pre-operative stereotactic radiosurgery treatment is preferred to post-operative treatment for smaller solitary brain metastases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Neurosurgical Journal 2017年第4期3卷 205-212页

作者： Hamidreza Aliabadi Arian m. Nikpour David S. Yoo James E. Herndon ii John H. Sampson John P. Kirkpatrick Spine and Neurosurgery Associates 1301 Secret Ravine Parkway Suite 200Roseville CA 95661 USA Department of Radiology UC Davis MedicalCenter UC Davis School of Medicine Sacramento CA USA Department ofRadiation Oncology Duke University Medical Center Durham NC USA Department of Biostatistics and Bioinformatics Duke University MedicalCenter Durham NC USA Department of Surgery Division of NeurosurgeryDuke University Medical Center Durham NC USA

Background:While the optimal combination of whole-brain radiotherapy (WBRT), stereotactic radiosurgery (SRS) and surgical resection in the treatment of brain metastases, is controversial, the addition of SRS to surgical resction of solitary metastasis may enhance local control while potentially minimizing toxicity associated with adjuvant WBRT. This study seeks to determine whether pre-operative SRS to the lesion versus post-operative SRS to the resection bed may reduce irradiation of adjacent normal brain tissue. methods:A retrospective study of 12 patients with 13 surgically resected cerebral metastases was performed. The pre-operative contrast-enhancing tumors and post-operative resection cavities plus any enhancing residual disease were contoured to yield the gross target volume (GTV). In turn these GTV''''s were uniformly expanded by 3-mm to generate the pre-operative, as well as post-operative planning target volume (PTV.) For each lesion, a 7-static-conformal-beam, non-coplanar plan utilizing 6 mV photons was generated to encompass the PTV within the 85％isodose line. Excess normal brain volume irradiated was defined as the volume outside the GTV receiving the prescribed dose. Results:When lesions were divided into two groups-Group A (pre-operative GTV''''s15 cc, n=4)-the average volume of normal brain irradiated was significantly smaller if pre-operative SRS was used for treatment of lesions in Group A (9.5 vs. 16.8 cc, paired t-test, p=0.0045). In contrast, this volume was smaller for Group B lesions if post-operative SRS was used for treatment of these lesions (27.6 vs. 51.2 cc, p=0.252). A comparison of groups with respect to mean volume differences between pre-and post-operative SRS was significantly different (two-sample t-test p=0.016). GTV and the difference between pre-and post-operative volume were highly correlated (Pearson correlation=?0.875, pment of smaller

关键词： Stereotactic radiosurgery Brain metastases Pre-operative Solitary brain metastases

Importance of periphytic biofilms for carbon cycling in paddy fields:A review

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第1期34卷 36-43页

作者： Lei ZHOU Yonghong WU Junzhuo LIU Pengfei SUN Ying XU Jan DOLFING Robert GmSPENCER Erik JEPPESEN State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Zigui Three Gorges Reservoir Ecosystem Observation and Research Station of Ministry of Water Resources of the People's Republic of ChinaYichang 443605China College of Nanjing University of Chinese Academy of SciencesNanjing 211135China Faculty of Energy and Environment Northumbria UniversityNewcastle upon Tyne NE18QHUK Department of Earth Ocean and Atmospheric ScienceFlorida State UniversityTallahassee FL 32306USA Department of Ecoscience&Centre for Water Technology(WATEC) Aarhus UniversityAarhus DK-8000Denmark Sino-Danish Centre for Education and Research Beijing 100049China Limnology Laboratory Department of Biological Sciences and Centre for Ecosystem Research and Implementation(EKOSAM)Middle East Technical UniversityAnkara 06800Turkiye Institute of marine Sciences Middle East Technical UniversityMersin 33731Turkiye

Paddy fields play an important role in global carbon(C) cycling and are an important source of methane(CH_(4)) emissions. Insights into the processes influencing the dynamics of soil organic C(SOC) in paddy fields are essential for maintaining global soil C stocks and mitigating climate change. Periphytic biofilms composed of microalgae, bacteria, and other microorganisms are ubiquitous in paddy fields, where they directly mediate the transfer of elements at the soil-water interface. However, their contributions to C turnover and exchange have been largely neglected. Periphytic biofilms affect and participate in soil C dynamics by altering both abiotic(e.g., pH and redox potential) and biotic conditions(e.g., microbial community composition and metabolism). This review summarizes the contributions of periphytic biofilms to soil C cycling processes, including carbon dioxide fixation, SOC mineralization, and CH_(4) emissions. Future research should be focused on: i) the mechanisms underlying periphytic biofilm-induced C fixation and turnover and ii) quantifying the contributions of periphytic biofilms to soil C uptake, stabilization, and sequestration in paddy fields.

关键词： carbon fixation carbon mineralization carbon sequestration methane emission microbial aggregates soil organic carbon

Rapid method for the Determination of Total monosaccharide in <i>Enterobacter cloacae</i>Strains Using Fourier Transform Infrared Spectroscopy

在线全文

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2011年第2期2卷 212-216页

作者： richard J. Delle Bovi Allan Smits Harry m. Pylypiw Quinnipiac University Hamden USA

Fourier Transform Infrared Spectroscopy (FTIR) was used to quantify total monosaccharide content in the bacterium Enterobacter cloacae and several of its biofilm mutants. Bacterial biofilm samples were grown on trypticase soy agar, and 30 μL aliquots of aqueous sample bacterial plus biofilm were deposited into the center of barium fluoride crystals and dried at 50°C for 1-hour before being scanned by FTIR. The total amounts of monosaccharides were estimated using the absorbance of the mono-saccharide peak, 1192 - 958 cm–1, and normalized using the amide ii peak, 1585 - 1483 cm–1. This method provided a linear correlation between the absorbance of the monosaccharide peak and concentration of monosaccharide in standard monosaccharides, fructose, glucose, mannose, and rhamnose, over a concentration range of 0.5 - 2.0 mg/mL.

关键词： Enterobacter Cloacae Biofilm Glucose Fructose mannose Rhamnose monosaccharides Fourier Transform Infrared Spectroscopy FTIR

Comparison of minimal Skin Incision Technique in Living Kidney Transplantation and Conventional Kidney Transplantation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese medical Journal 2016年第8期129卷 917-921页

作者： Sang-Dong Kim Ji-ii Kim In-Sung moon Sun-Cheol Park Department of Surgery Division of Vascular and Transplant Surgery College of Medicine The Catholic University of Korea Seoul 137-040 Korea

Background：Recently,the most common incision for kidney transplantation （KT） is an inverted J-shaped incision known as the ＆quot;hockey-stick.＆quot; However,demands for minimally invasive surgery in KT are increasing as in other various fields of ***,we evaluated whether there is difference between minimal skin incision technique in kidney transplantation （mIKT） and conventional KT （CKT）.methods：Between June 2006 and march 2013,a total of 452 living kidney transplant patients were *** mIKT group included 17 young unmarried women whose body mass index was 〈25 kg/m^2 and had no anatomic *** CKT group included 435 *** mIKT operation technique restricted to the 10 cm-sized skin incision in the lower right abdomen from laterally below the anterior superior iliac spine to the midline just above the pubis was *** compared the baseline clinical characteristics and postoperative results between two *** proper comparison,propensity score matching was ***：There was no difference in graft function,survival,and postoperative complication rate between mIKT and CKT groups （all P 〉 0.05）.The 5-year graft survival was 92.3% and 85.7% in mIKT and CKT groups,respectively （P =0.786）.Conclusions：Our results indicated that mIKT showed more favorable cosmetic results,and there were no statistical differences in various postoperative factors including graft function,survival,and complications compared with ***,we suggested that mIKT is an appropriate method for selected patients in living KT.

关键词： Kidney Transplantation minimal Skin Incision: Conventional Kidney Transplantation

在线全文

学校读者我要写书评

暂无评论

煤层气和页岩气藏

国外石油动态 2008年第18期 1-12页

作者： Creties D Jenkins Charles m Boyer ii 常伟（译）

美国煤层气和页岩气藏的天然气年产量约为2．7Tscf，占天然气总产量的15％。其中，约1．7Tscf天然气产于4万多口煤层气井，至少涉及到20个不同的盆地。其余的1．0Tscf天然气则来自4万多口页岩气井，涉及5个主要盆地。随着煤层气钻井步... 详细信息

美国煤层气和页岩气藏的天然气年产量约为2．7Tscf，占天然气总产量的15％。其中，约1．7Tscf天然气产于4万多口煤层气井，至少涉及到20个不同的盆地。其余的1．0Tscf天然气则来自4万多口页岩气井，涉及5个主要盆地。随着煤层气钻井步伐的减缓，页岩气继续被当作美国最热门的天然气来源之一，而钻井活动也快速增加，尤其是美国中南部[巴内特页岩（Barnett）及其等同物]、阿帕拉契（Appalachian）盆地以及众多的落基山盆地。

关键词：煤层气井页岩气气藏煤层气钻井天然气盆地年产量美国

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

强脉冲离子注入中的脉冲能量效应研究

核技术 2000年第10期23卷 689-696页

作者：赵渭江颜莎乐小云韩宝玺薛建明王宇钢 Remmev G E Opekounov m S Isakov I F Grushin ii 北京大学重离子物理研究所北京100871 俄罗斯托木斯克科技大学核物理研究所

在脉冲离子束流密度为１５－１２０Ａ／ｃｍ２、脉宽为５０－１５０ｎｓ、加速电压为１５０－２６０ｋＶ范围内，在１×１０４ｃｍ－２的低注量水平上，研究了高功率Ｃｎ＋＋Ｈ＋混合离子束注入４５号钢样品的强脉冲能量效应．摩擦磨损... 详细信息

在脉冲离子束流密度为１５－１２０Ａ／ｃｍ２、脉宽为５０－１５０ｎｓ、加速电压为１５０－２６０ｋＶ范围内，在１×１０４ｃｍ－２的低注量水平上，研究了高功率Ｃｎ＋＋Ｈ＋混合离子束注入４５号钢样品的强脉冲能量效应．摩擦磨损和微观硬度测量以及ＳＥＭ和Ｘ射线衍射分析表明，上述低注量强脉冲离子束注入可以改变材料表面的微观结构和力学特性，而且强烈依赖于单个脉冲离子束的功率密度和能量密度，在相同离子注量条件下，普通Ｃ＋＋Ｈ＋离子注入对４５号钢样品表面微硬度和摩擦系数未见明显影响．直接证明了强脉冲能量效应在离子注入中是相对独立于注入元素掺杂效应的又一可利用的重要效应．基于一维导热模型，讨论了强脉冲能量效应以及脉冲离子束功率密度对离子束材料表面改性的作用。

关键词：脉冲能量效应表面改性半导体材料

在线全文

学校读者我要写书评

暂无评论

徐家汇观象台天文测时的偶然误差

天文学报 1954年第2期 185-195页

作者：叶叔华中国科学院紫金山天文台

用运转中星仪测时,据梅耶(mayer)公式,有式中 u:时钟改正量, α:所观测星的赤经, T:所记录的中天时刻, i:仪器的水平差, I:水平差的系数, k:仪器的方位角差, K:方位角差的系数, d:钟速差、光行差、接触条宽、以及其他系统差的订正。今... 详细信息

用运转中星仪测时,据梅耶(mayer)公式,有式中 u:时钟改正量, α:所观测星的赤经, T:所记录的中天时刻, i:仪器的水平差, I:水平差的系数, k:仪器的方位角差, K:方位角差的系数, d:钟速差、光行差、接触条宽、以及其他系统差的订正。今根据徐家汇观象台自1952年11月至1954年2月共16个月间的观测数据,决定T与i的误差ε_т,ε_i,包括观测者(K),(S),(L)三人。徐台测时用口径80mm,焦距86cm的帕兰(Prin)中星仪,目镜放大率约100倍。所用接触测微器由马达带动,并用人手操纵。观测一般使用两具记

关键词：方位角差徐家改正量星数