检索结果-南通市图书馆

Design of Buoys for Mounting Wind Turbines at Exposed sites

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2018年第2期17卷 257-266页

作者： ERDOGAN Beytullah CELIKKOL Barbaros swift Robinson Department of Mechanical Engineering Bülent Ecevit UniversityZonguldak 67200Turkey Department of Mechanical Engineering University of New HampshireDurhamNH 03824USA

In this study, two designs for a buoy capable of supporting a 10 kW wind turbine and its tower were developed to operate at the University of New Hampshire's Center of Ocean Renewable Energy testing site located off the Isles of shoals, New Hampshire. The buoys are to be moored by a catenary chain system. To evaluate wave response, two Froude-scaled models were constructed, tested, and compared at the Ocean Engineering wave tank at the University of New Hampshire. These buoys have been implemented and compared with wave tank measurements of the spar displacement at a reference elevation 2.44 m above the mean water level.

关键词： wind energy ocean wave buoy

Positive- and Zero-sequence Impedance Estimation of YNyn0+d-Connected Main Power Transformers in Wind Power Applications

在线全文

学校读者我要写书评

暂无评论

CsEE Journal of Power and Energy systems 2021年第1期7卷 57-65页

作者： Franklin L.Quilumba Robert E.Jimerson Ken swift Rafael Garc´ıa with Oncor Electric Delivery Fort WorthTX 76102 USA

With the increased penetration of non-conventionalrenewable energy resources, such as wind power plants (WPPs),into the power system, a lot of interest has been placed on studyingtheir impact for system protection, planning and operationsto ensure continued reliability of the electric grid. The impactof WPPs on the grid is typically identified during generationinterconnection studies. One of the challenges faced by protectionand planning engineers, at an early stage in this process, isthat many of the studies involving these power plants must beperformed without specific data available because the equipmentis not built yet. Among all the needed data, a particular interest inthis study is placed on the positive- and zero-sequence impedancesof the main power transformer (MPT) that interconnects a windpower plant to the transmission system due to its contribution toshort-circuit current during ground faults. The most commonlyfound in practice MPT winding configurations is a high-voltagewinding in wye with neutral bushing;a low-voltage windingin wye with neutral bushing without phase shift between thesewindings, and a stabilizing tertiary winding connected in deltathat is not designed for external loading designated as YNyn0+***, this paper proposes a methodology to estimate the sequenceimpedances of YNyn0+d transformers from a statistical point ofview applying clustering and regression analyses on existing MPTtest report data.

关键词： Positive-and zero-sequence impedance estimation power transformers short-circuit analysis threewinding transformer with buried tertiary wind power integration

Post hoc validation of a tool that accurately predicts the outcome of endoscopic therapy in Bouveret syndrome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gastroenterology Report 2022年第1期10卷 298-304页

作者： Carla swift John Ong Man Zhou Benjamin stokell Yasseen Al-Naeeb Department of Gastroenterology Norwich University HospitalNorwichUK Department of Engineering University of CambridgeCambridgeUK Department of Medicine National University of SingaporeSingapore GKT school of Medical Education King’s College LondonLondonUK statistical Laboratory Centre for Mathematical SciencesUniversity of CambridgeCambridgeUK Department of Gastroenterology Bedford HospitalBedfordUK

Background Bouveret syndrome is characterized by gallstone impaction in the upper gastrointestinal tract causing gastric outlet *** Bouveret syndrome,endoscopic gallstone removal can avert the need for ***,in cases in which endoscopic therapy is unlikely to succeed,endoscopic attempts delay definitive treatment and compound patient *** previously developed a model that predicts endoscopic outcomes from data derived through a systematic *** tool uses gallstone length,site of impaction,and the number of planned methods of lithotripsy to predict the likelihood of endoscopic success with an accuracy of 81.0%.This study aimed to evaluate our tool performance in an independent,non-training data set and assess endoscopic and surgical *** systematic searches of the PubMed,scopus,and Cochrane databases were performed for articles published between 16 April 2018 and 1 June *** data reported after our previous study were harvested and inputted into the tool to evaluate their ability to accurately predict outcomes when compared with actual *** Newly collated data in fields of interest showed no significant statistical differences compared with previous training data *** therapy was successful in 41.9%of *** of ≤4 cm had a higher chance of successful endoscopic intervention(odds ratio 6.7,95%confidence interval 1.7–25.8,Ps of surgery were reported in 29.5%;there was one fatality *** hoc evaluation of our predictive tool demonstrated an AUROC score of *** We have demonstrated in an independent data set that the tool can be used to accurately predict outcomes of endoscopic *** in whom endoscopic therapy is most likely to fail should be offered an early surgical opinion.

关键词： Bouveret syndrome Bouveret’s syndrome gallstone duodenal obstruction gastric outlet obstruction gallstone ileus

Dynamics of submersible Mussel Rafts in Waves and Current

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2015年第3期29卷 431-444页

作者： WANG Xin-xin M.Robinson swift Tobias DEWHURsT Igor TsUKROV Barbaros CELIKKOL Carter NEWELL Center for Ocean Engineering and Mechanical Engineering Department University of New Hampshire Laboratory of Fisheries Engineering Fisheries College Ocean University of China Pemaquid Mussel Farms

To investigate the dynamics of submersible mussel rafts, the finite element program Aqua-FETM, developed by the University of New Hampshire（UNH）, was applied to rafts moored at the surface and submerged. The submerged configuration is used to reduce wave forcing and to avoid contact with floating ice during winters in northern waters. Each raft consists of three pontoons connected by a grid framework. Rafts are intended to support densely spaced mussel ropes hung from the framework. When submerged, the pontoons are flooded, and the raft is held vertically by floats attached by lines. The computer models were developed in Aqua-FE？ to simulate the effects of waves and current. They were validated by comparison with wave tank results by use of a 1/10 scale raft physical model. Comparisons showed good agreement for the important heave（vertical） and pitch（rotational） motions, though there was a tendency towards conservative results for wave and current drag. Full-scale simulations of surface and submerged single raft and two rafts connected in tandem were performed. submerged raft wave response was found to be reduced relative to that at the surface for both the single and two-raft configurations. In particular, the vertical motion of mussel rope connection points was significantly reduced by submergence, resulting in reduced potential for mussel drop-off. For example, the maximum vertical velocities of mussel rope attachment points in the submerged two raft case were 7%-20% of the corresponding velocities when at the surface.

关键词： mussel raft submersible mussel ropes finite element model waves and current storm response

在线全文

学校读者我要写书评

暂无评论

Brought Up That Way

中学生英语（上旬刊） 2014年第12期 12-13页

作者： Taylor swift 湖北省宜昌市

Emily从学校回到家拉住他爸爸的手他说：“宝贝女儿，你怎么了？”她说：“别再送我回那个学校了，

关键词：小学英语课外阅读阅读材料

在线全文

学校读者我要写书评

暂无评论

Gulliver's travels

作者： Jonathan swift edited by Albert J. Rivero.

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Breathe

新高考（高一语文、数学、英语） 2010年第3期 56-58页

作者： Taylor swift

I see your face in my mind as I drive away Cause none of us thought tt was gonna end that way People are people, and sometimes we change our minds But it's killing me to see you go after all this time

关键词：高中英语课外阅读阅读材料

First-principles calculations of hyperfine interaction,binding energy,and quadrupole coupling for shallow donors in silicon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 186-194页

作者： Michael W.swift Hartwin Peelaers sai Mu John J.L.Morton Chris G.Van de Walle Department of Physics University of CaliforniaSanta BarbaraCA 93106-9530USA Us Naval Research Laboratory Center for Computational Materials ScienceWashingtonDC 20375USA Materials Department University of CaliforniaSanta BarbaraCA 93106-5050USA Department of Physics and Astronomy University of KansasLawrenceKansas 66045USA Department of Electronic and Electrical Engineering UCLLondonWC1E 7JEUK

spin qubits based on shallow donors in silicon are a promising quantum information technology with enormous potential scalability due to the existence of robust silicon-processing ***,the most accurate theories of donor electronic structure lack predictive power because of their reliance on empirical fitting parameters,while predictive ab initio methods have so far been lacking in accuracy due to size of the donor wavefunction compared to typical simulation *** show that density functional theory with hybrid and traditional functionals working in tandem can bridge this *** first-principles approach allows remarkable accuracy in binding energies(67 meV for bismuth and 54 meV for arsenic)without the use of empirical *** also obtain reasonable hyperfine parameters(1263 MHz for Bi and 133 MHz for As)and superhyperfine *** demonstrate the importance of a predictive model by showing that hydrostatic strain has much larger effect on the hyperfine structure than predicted by effective mass theory,and by elucidating the underlying mechanisms through symmetry analysis of the shallow donor charge density.

关键词： density donor hyperfine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

热异常技术——一种勘探油气的新方法

地质科技情报 1992年第1期11卷 87-89页

作者： A Earl swift 张宏样贵州石油勘探指挥部情报所 550001

swift能源公司是位于休斯敦的一个独立的美国油气生产者,几年前它就意识到在90年代的前5年中原油和天然气的价格周期将导致油品价格有较大幅度提高。因此它就开始研究把一种专门技术发展成一些新的勘探技术,以便为勘探和开发美国油气储... 详细信息

swift能源公司是位于休斯敦的一个独立的美国油气生产者,几年前它就意识到在90年代的前5年中原油和天然气的价格周期将导致油品价格有较大幅度提高。因此它就开始研究把一种专门技术发展成一些新的勘探技术,以便为勘探和开发美国油气储量提供一种有竞争力的手段。用于水平钻井和先进地震资料处理的一些技术已引起了广泛的注意。此外。

关键词：石油天然气勘探热流异常