检索结果-南通市图书馆

Chance-constrained Optimal Dispatch of Integrated Electricity and Natural Gas Systems Considering Medium and Long-term Electricity Transactions

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2019年第3期5卷 315-323页

作者： gang Wu Yue xiang Junyong liu xin Zhang Shuoya Tang College of Electrical Engineering Sichuan UniversityChengdu 610065China Energy and Power Theme School of WaterEnergy and EnvironmentCranfield UniversityCranfieldMK430ALUK

A novel stochastic optimal dispatch model is proposed considering medium and long-term electricity transactions for a wind power integrated energy system using chance constrained *** electricity contract decomposition problem is introduced into the day-ahead optimal dispatch plan formulation *** the case that decomposition results may be not executable in the dispatch plan,a coordinated optimization strategy based on the Lagrange multiplier is proposed to eliminate the non-executable electric *** the same time,the uncertainties and correlation of wind power are considered in the dispatch model,and the original stochastic dispatch problem is transformed into a mixed integer second-order cone programming problem using second-order cone relaxation and sample average approximation *** study results demonstrate the validity of the proposed method.

关键词： Chance-constrained programming electricity transaction uncertainties wind power

Noise-Induced Transition in a Voltage-Controlled Oscillator Neuron Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第7期50卷 257-260页

作者： xiE Hui-Zhang liu Xue-Mei AI Bao-Quan liu Liang-gang LI Zhi-Bing Department of Physics Sun Yat-Sen University Guangzhou 510275 China School of Physics South China University of Technology Guangzhou 510640 China School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510631 China Faculty of Information Technology Macao University of Science and Technology Macao China

In the presence of Gaussian white noise,we study the properties of voltage-controlled oscillator neuronmodel and discuss the effects of the additive and multiplicative *** is found that the additive noise can accelerate andcounterwork the firing of neuron,which depends on the value of central frequency of neuron itself,while multiplicativenoise can induce the continuous change or mutation of membrane potential.

关键词： Gaussian white noise transition voltage-controlled oscillator neuron model

Study on the vibration band gap and vibration attenuation property of phononic crystals

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第1期51卷 85-99页

作者： WEN JiHong WANG gang YU DianLong ZHAO Honggang liu YaoZong WEN xiSen College of Mechantronic Engineering and Automation National University of Defense TechnologyChangsha 410073China

Phononic crystals (PCs) are functional materials with periodic structures and elas- tic wave (vibration) band gaps, where propagation of vibrations with frequencies within band gaps is forbidden. PCs with finite periods can restrain the propagation of vibrations with frequencies in band gaps and thus has vibration attenuation property. Worldwide, many institutions and researchers are engaged in the re- search of PCs, however, studies on the vibration attenuation property of PCs are still limited. In this paper, we report our study of band gaps and vibration attenua- tion properties of 1) a simplified PC—periodic mass-spring structures, 2) longitu- dinal vibration of one-dimensional (1D-), 2D-, 3D-PCs, and 3) the flexural vibration of 1D- and 2D-PCs. These studies provide a foundation for the applications of PCs in vibration attenuation.

关键词： phononic crystals elastic band gaps vibration band gaps vibration attenuation

在线全文

学校读者我要写书评

暂无评论

汉代献赋纪事的书写模式与后世拟效

齐鲁学刊 2024年第2期 129-141页

作者：刘祥西安交通大学人文社会科学学院陕西西安710049

与受诏被动作赋不同,献赋是赋家主动向君主投献赋作。献赋纪事一般包含四个要素:赋家作赋、进呈赋作、帝王读赋、赋家为郎。其中赋家主动进献是核心,而帝王反馈则是此类纪事着重介绍的内容。汉代献赋故事广泛流布,引起历代文士、帝王仪... 详细信息

与受诏被动作赋不同,献赋是赋家主动向君主投献赋作。献赋纪事一般包含四个要素:赋家作赋、进呈赋作、帝王读赋、赋家为郎。其中赋家主动进献是核心,而帝王反馈则是此类纪事着重介绍的内容。汉代献赋故事广泛流布,引起历代文士、帝王仪式化的行为模拟以及史家模式化的历史表述。除复现献赋活动外,唐代诗人通过自比相如、扬雄献赋,为参加科举考试赋予自荐于天子的能动意味。而一旦科举失利,“献赋不售”又成为常见的诗歌表达。

关键词：汉赋纪事献赋司马相如扬雄枚皋科举考试

Combined MR Imaging for Pulmonary Embolism and Deep Venous Thrombosis by Contrast-enhanced MR Volume Interpolated Body Examination

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2020年第1期40卷 192-198页

作者： Qing FU Ding-xi liu xiang-chuang KONG Zi-qiao LEI Department of Radiology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Hubei Province Key Laboratory of Molecular Imaging Wuhan 430022China

MR pulmonary angiography(MRPA)combined with indirect MR venography(MRV)was attempted by using 3D contrast-enhanced MR volume interpolated body examination(VIBE)*** rate for deep venous thrombosis(DVT)detection between MRV and duplex sonography(DUS)was evaluated;the potential of this method for venous thromoembolism(VTE)was also ***-four patients with DUS-identified DVT were enrolled in this *** was performed after a single administration of Gadopentetate *** 3D VIBE was applied for visualizing pulmonary arteries,abdominal veins,pelvic and leg veins,ranging from lung apex to ankle *** radiologists observed the MR images in consensus,recorded the location and number of *** images were assessed based on per-vein *** agreement rate between MRV and DUS for venous segment-to-segment comparison was analyzed by Wilcoxon rank sum *** the patients were diagnosed as having DV 1 by *** detected 55 more venous segments with thrombi than DUS based on per-vein segment ***-three patients with pulmonary embolism(PE)were detected by ***-one patients underwent both pulmonary CT angiography and MRPA,and consistency for PE detection was 100%.Total examination time of the combined MR protocol was 7 min for each *** contrast-enhanced VIBE sequence proves to be a feasible and reliable method for VTE diagnosis in one-stop MR scanning procedure,and contrast-enhanced VIBE performs better to depict DVT than DUS on per-vein segment basis.

关键词： magnetic resonanee imaging pulmonary embolism deep venous thrombosis venous thromoembolism

Soil water repellency and influencing factors of Nitraria tangutorun nebkhas at different succession stages

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 Arid Land 2014年第3期6卷 300-310页

作者： HaoTian YANG xinRong LI LiChao liu YanHong GAO gang LI RongLiang JIA Shapotou Desert Research and Experiment Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

Abstract： Soil water repellency （WR） is an important physical characteristic of soil surface. It is capable of largely influencing the hydrological and geomorphological processes of soil, as well as affecting the ecological processes of plants, such as growth and seed germination, and has thus been a hot topic in recent research around the world. In this paper, the capillary rise method was used to study the soil WR characteristics of Nitraria tangutorun nebkhas. Soil water repellencies at different succession stages of Nitraria tangutorun were investigated, and the relationships between soil WR and soil organic matter, total N, and total P, soil texture, pH, and concentrations of CO32, HCO3-, CI, SO42-, Na~, K~, Ca2~ and Mg2＋ were discussed. Soil WR may be demonstrated at the following nebkhas dune evolvement stages： extremely degraded〉degraded〉stabilized〉well developed〉newly developed〉quick sand. Apart from some soil at the bottom, the WR of other soils （crest and slope of dune） was found to be largest at the topsoil, and decreased as the soil depth increased. The results showed that multiple factors affected soil WR characteristics e.g. WR increased significantly as the contents of soil organic matter and total N increased, but did not change as the total P content increased. Soil texture was a key factor affecting soil WR; soil WR increased significantly as clay content increased, and decreased significantly as sand content increased. Low pH was shown to be more suitable for the occurrence of soil WR. Four cations （Ca2＋, Mg2＋, K＋ and Na＋） and two anions （CI and SO42） enhanced soil WR, while CO32-decreased it. HCO3- did not show any observable effect. Finally, we established a best-fit general linear model （GLM） between soil-air-water contact angle （CA） and influencing factors （CA=5.606 sand＋6.496 （clay and silt）-2.353 pH＋470.089 CQ2＋11.346 Na＋-407.707 Cl--14.245 SO42-＋0.734 total N-519.521 ）. It was concluded that all soils contain subcritical WR （0°〈CA〈90°）. Th

关键词： hydrophobicity soil-air-water contact angle capillary rise method Nitraria tangutorun nebkhas vegetation succession stage

化学试剂和助剂制造行业VOCs排放成分谱及影响

在线全文

学校读者我要写书评

暂无评论

环境科学与技术 2024年第S01期47卷 111-117页

作者：王巧敏车祥陈曦何小红刘红潘妙婷江敏孜林长青上海市化工环境保护监测站上海200050 上海市环境监测中心上海200235

使用SUMMA罐采集和GC-MS定量分析技术研究了上海市化学试剂和助剂制造行业6家企业有组织废气中的挥发性有机物(VOCs),计算了各企业VOCs排放量和排放系数,并对排放成分谱及臭氧生成潜势(OFP)进行了分析和评价。结果表明,该行业VOCs的基... 详细信息

使用SUMMA罐采集和GC-MS定量分析技术研究了上海市化学试剂和助剂制造行业6家企业有组织废气中的挥发性有机物(VOCs),计算了各企业VOCs排放量和排放系数,并对排放成分谱及臭氧生成潜势(OFP)进行了分析和评价。结果表明,该行业VOCs的基本组分为烷烃、芳香烃、卤代烃和含氧烃(OVOCs),这些组分占总VOCs的99.5%以上;主要特征污染物包括2-甲基戊烷、3-甲基戊烷、正己烷、甲基环戊烷、四氢呋喃、丙酮、乙苯和间/对二甲苯;烷烃、芳香烃和OVOCs是主要的光化学活性组分;四氢呋喃、2-甲基戊烷、3-甲基戊烷、1,2,4-三甲苯、1.2,3-三甲苯等是对OFP贡献较大的因子;源反应性(SR)处于各行业平均水平。研究建议该行业应重点管控C6-C8烷烃、C8-C9芳香烃和OVOCs的排放,并特别关注臭氧生成能力强的VOCs因子,以降低其对环境和人体健康的影响。

关键词：化学试剂和助剂制造行业挥发性有机物排放特征源成分谱臭氧生成潜势

Constructing the separation pathway for photo-generated carriers by diatomic sites decorated on MIL-53-NH2(Al)for enhanced photocatalytic performance

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第8期15卷 7034-7041页

作者： gang Wang Yan liu Ning Zhao Huimei Chen Wenjie Wu Yueyue Li xiangwen liu Ang Li Wenxing Chen Junjie Mao Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China Institute of Analysis and Testing Beijing Academy of Science and Technology(Beijing Center for Physical and Chemical Analysis)Beijing 100094China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

High yield production of phenol from hydroxylation of benzene with low energy consumption is of paramount importance,but still ***,a new strategy,consisting of using diatomic synergistic modulation(DSM)to effectively control the separation of photo-generated carriers for an enhanced production of phenol is *** atomic level dispersion of Fe and Cr respectively decorated on Al based MIL-53-NH_(2)photocatalyst(Fe1/Cr:MIL-53-NH_(2))is designed,in which Cr single atoms are substituted for Al3+while Fe single atoms are coordinated by ***,the Fe1/Cr:MIL-53-NH_(2)significantly boosts the photooxidation of benzene to phenol under visible light irradiation,which is much higher than those of MIL-53-NH_(2),Cr:MIL-53-NH_(2),Fe1/MIL-53-NH_(2),and Fe nanoparticles/Cr:MIL-53-NH_(2)*** and experimental results reveal that the Cr single atoms and Fe single atoms can act as electron acceptor and electron donor,respectively,during photocatalytic reaction,exhibiting a synergistic effect on the separation of the photo-generated carriers and thereby causing great enhancement on the benzene *** strategy provides new insights for rational design of advanced photocatalysts at the atomic level.

关键词： diatomic sites MIL-53-NH2 charge-carrier dynamics photocatalysis benzene oxidation

Gold immunochromatographic sensor for the rapid detection of twenty-six sulfonamides in foods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2017年第8期10卷 2833-2844页

作者： Yanni Chen Liqiang liu Liguang Xu Shanshan Song Hua Kuang gang Cui Chuanlai Xu State Key Laboratory of Food Science and Technology Jiangnan University Wuxi 214122 China School of Food Science and Technology Jiangnan University Wuxi 214122 China

A gold immunochromatographic sensor （GICS） was developed for the rapid detection of 26 sulfonamides in honey samples. The sensor was based on a group-specific monoclonal antibody （mAb） that can recognize all 26 sulfonamides. Three haptens （hapten I with a thiazole ring, hapten 2 with a benzene ring, and hapten 3 with a straight carbon chain） were used for antigen preparation. With hybridoma technology, a group-specific mAb was screened with a 50% maximal inhibitory concentration （IC50） against sulfathizole （STZ） and the other 25 analogues ranging from 0.08 to 90.18 ng/mL. Mono-dispersed gold nanoparticles were conjugated with the mAb to develop the lateral immunochromatographic strip. A labeled antibody concentration of 0.1 pg/mL and a coating antigen concentration of 0.2 μg/mL in the test line were chosen for strip preparation. Under optimized conditions, the visual limits of detection （vLOD） for the concentrations of STZ, sulfamethoxazole, sulfamethizole, sulfadiazine, sulfamerazine, sulfadimethoxine, sulfamonomethoxine, sulfameter, sulfamethoxypyridazine, and sulfachloropyridazine were 5, 0.25, 0.25, 10, 5, 10, 25, 2.5, 5, 0.25, and 10 μg/kg, respectively. Scanner analysis in honey samples revealed good performance for detection of the 26 sulfonamides. Commercial honey samples were tested with the sensor and positive results were confirmed with high-performance liquid chromatography. The proposed strip sensor provides a convenient method for the rapid and reliable determination of sulfonamides pollutants in honey samples.

关键词： sulfonamides gold immunochromatographic sensor monoclonal antibody honey samples