检索结果-南通市图书馆

Electrohydrodynamic behaviors of droplet under a uniform direct current electric field

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 Physics B 2020年第3期29卷 312-317页

作者： Zi-Long Deng mei-mei sun Cheng Yu Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Department of Mechanical Engineering University of Hawaii at ManoaHonolulu 96822USA

The electrohydrodynamic behaviors and evolution processes of silicone oil droplet in castor oil under uniform direct current(DC)electric field are visually observed based on a high-speed microscopic ***,the effects of different working conditions,such as electric field strength,droplet size,etc.,on droplet behaviors are roundly *** can be found that there are four droplet behavior modes,including Taylor deformation,typical oblique rotation,periodic oscillation,and fracture,which change with the increase of electric field *** is also demonstrated that the degree of flat ellipse deformation gets larger under a stronger electric ***,both of the stronger electric field and smaller droplet size lead to an increase in the rotation angle of the droplet.

关键词： DC electric field droplet deformation rotation

Research of the traffic characteristics for the real time online traffic classification

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2011年第3期18卷 92-98页

作者： sun mei-feng CHEN Jing-tao College of Information Engineering Yangzhou University Yangzhou 225009 China

Aiming at the hysteretic characteristics of classification problem existed in current intemet traffic identification field, this paper investigates the traffic characteristic suitable for the on-line traffic classification, such as quality of service （QoS）. By the theoretical analysis and the experimental observation, two characteristics （the ACK-Len ab and ACK-Len ha） were obtained. They are the data volume which first be sent by the communication parties continuously. For these two characteristics only depend on data＇s total length of the first few packets on the flow, network traffic can be classified in the early time when the flow arrived. The experiment based on decision tree C4.5 algorithm, with above 97% accuracy. The result indicated that the characteristics proposed can commendably reflect behavior patterns of the network application, although they are simple.

关键词： on-line traffic classification traffic characteristics ACK-Len ab ACK-Len ba

Multiscale Basis Functions for Singular Perturbation on Adaptively Graded Meshes

在线全文

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2014年第5期6卷 604-614页

作者： mei-Ling sun Shan Jiang College of Mathematics Science Yangzhou UniversityYangzhou 225002China Education and Technology Center Nantong Vocational CollegeNantong 226007China Department of Mathematics Texas A&M UniversityCollege StationTX 77843USA

We apply the multiscale basis functions for the singularly perturbed reaction-diffusion problem on adaptively graded meshes,which can provide a good balance between the numerical accuracy and computational *** multiscale space is built through standard finite element basis functions enriched with multiscale basis *** multiscale basis functions have abilities to capture originally perturbed information in the local problem,as a result our method is capable of reducing the boundary layer errors remarkably on graded meshes,where the layer-adapted meshes are generated by a given *** numerical experiments we demonstrate that the multiscale method can acquire second order convergence in the L^(2)norm and first order convergence in the energy norm on graded meshes,which is independent ofε.In contrast with the conventional methods,our method is much more accurate and effective.

关键词： Multiscale basis functions singular perturbation boundary layer adaptively graded meshes.

Optimization and mechanism of gold-bearing sulfide flotation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2014年第3期33卷 363-368页

作者： Zhong-mei sun Chun-Bao sun Ji-Zhen Wang Wan-Zhong Yin School of Civil and Environmental Engineering University of Science and Technology Beijing Zijin Research Institute of Mining and Metallurgy School of Materials & Metallurgy Northeastern University College of Zi Jin Mining Fuzhou University

In order to overcome the difficulty of extracting gold from gold-bearing sulfide ore by cyanide process flotation was adopted based on mineralogical analysis Mineralogy shows that gold particles are of superfine structure and mainly enclosed by sulfide ores. Primary gold-bearing sulfide ore is fine-grained pyrite and arsenopyrite. The paper describes the effects of ratios and dosage of activators and collectors on the recovery and grade of gold concentrate. A proper flotation flowsheet was then proposed based on experimental condition and closedcircuit test. The gold concentrate with the gold grade of25.14 g ton-1and the recovery of 86.94 % is obtained after one rougher, three cleaners, and four scavengers from fine grinding flotation process. Furthermore, the mechanisms of combined activators and combined collectors were studied by thermodynamic calculation, and structure-activity relationship of flotation reagent was also explained

关键词： Gold Pyrite Arsenopyrite Activator Combined reagent Flotation

Structure–activity relationship and mechanisms of reagents used in scheelite flotation

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2015年第12期34卷 882-887页

作者： Wan-Zhong Yin Ji-Zhen Wang Zhong-mei sun School of Resource and Civil Engineering Northeastern University Design & Research Institute of Zijin

Effects of carboxylic acid collector, benzohydroxamic acid (BHA), sodium hexametaphosphate (SHAP), sodium silicate, and oxalic acid on scheelite flotation were studied through flotation tests, quantum chemical calculation, and flotation solution computational chemistry. In terms of the calculation results, the relationship between chemical reactions occurring on the scheelite surface and molecular structures of the reagents were analyzed. The results show that BHA and carboxylic acid collectors interact with scheelite in different forms and the recovery of scheelite using sodium oleate as collector declines successively from SHAP, sodium silicate, to oxalic acid. Moreover, it is found that the performance of depressant in scheelite flotation is directly related to the group electronegativity, indicating that the latter is a dominant factor that determines the former. These findings will be helpful to the academic research communities of scheelite flotation.

关键词： Scheelite Flotation Flotation reagents Structure–activity relationship

Therapeutic endoscopy of a Dieulafoy lesion in a 10-year-old girl:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第6期10卷 1966-1972页

作者： Ying Chen mei sun Xu Teng Department of Pediatrics Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND There are multiple causes of sudden gastrointestinal bleeding in *** of Dieulafoy lesions(DLs)in children are *** can be fatal without appropriate *** SUMMARY We present a retrospective analysis of the clinical manifestations,endoscopic features,and treatment of a Chinese girl with a DL,as well as a review of the relevant literature.A 10-year-old girl was admitted to our hospital with sudden massive hematemesis and *** computed tomography revealed suspected submucosal bleeding in the ***,the disease was diagnosed with endoscopy due to the typical *** used electrocoagulation and hemoclips under endoscopy for *** recurrence of hematemesis was identified during 4-wk’*** DLs in children are rare but an important cause of sudden gastrointestinal *** pediatricians are inexperienced and often miss or delay *** as early as possible is the first choice for diagnosis and treatment.

关键词： Pediatric Dieulafoy lesion Endoscopy Treatment Case report

Vacuum states on compressible Navier-Stokes equations with general density-dependent viscosity and general pressure law

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2007年第8期50卷 1173-1185页

作者： mei-man sun Chang-jiang ZHU Laboratory of Nonlinear Analysis Department of MathematicsCentral China Normal UniversityWuhan 430079China

In this paper,we study the one-dimensional motion of viscous gas with a general pres- sure law and a general density-dependent viscosity coefficient when the initial density connects to the vacuum state with a *** prove the global existence and the uniqueness of weak solutions to the compressible Navier-Stokes equations by using the line *** this,some new a priori estimates are obtained to take care of the general viscosity coefficientμ(ρ)instead ofρ~θ.

关键词： Navier-Stokes equations density-dependent viscosity vacuum global existence 35Q30 76D05 35B45

Astragalus mongholicus polysaccharide inhibits lipopolysaccharide-induced production of TNF-α and interleukin-8

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第29期15卷 3676-3680页

作者： Yuan Yuan mei sun Ke-Shen Li Department of Pediatrics ShengjingAffiliated Hospital of China Medical University Shenyang110004 Liaoning Province China Department of Pediatrics Chinese PLA 211Hospital Harbin 150086 Heilongjiang Province China Ke-Shen ki Institute of BiomediCal Engineering HarbinEngineering University Harbin 150001 Heilongjiang ProvinceChina

AIM： To explore the effect of Astraga/us mongholicus polysaccharide （APS） on gene expression and mitogenactivated protein kinase （MAPK） transcriptional activity in intestinal epithelial cells （IEC）. METHODS： IEC were divided into control group, lipopolysaccharide （LPS） group, LPS＋ 50 μg/mL APS group, LPS＋ 100 μg/mL APS group, LPS＋ 200 μg/mL APS group, and LPS＋ 500 μg/mL APS group. Levels of mRNAs in LPS-induced inflammatory factors, tumor necrosis factor （TNF）-α and interleukin （IL）-8, were measured by reverse transcription-polymerase chain reaction. MAPK protein level was measured by Western blotting. RESULTS： The levels of TNF-α and IL-8 mRNAs were significantly higher in IEC with LPS-induced damage than in control cells. APS significantly abrogated the LPS-induced expression of the TNF-α and IL-8 genes. APS did not block the activation of extracellular signal- regulated kinase or c Jun amino-terminal kinase, but inhibited the activation of p38, suggesting that APS inhibits LPS-induced production of TNF-α and IL-8 mRNAs, possibly by suppressing the p38 signaling ***： APS-modulated bacterial productmediated p38 signaling represents an attractive strategy for prevention and treatment of intestinal inflammation.

关键词： Astraga/us mongho/icus polysaccharide Intestinal epithelial cells Tumor necrosis factor-Q Interleukin-8 Extracellular signal-regulated kinase CJun amino-terminal kinase p38 kinase

Polymerization of Styrene by Neutral Ni (II) Acetylide Complex

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 Chemical Letters 2001年第11期12卷 1033-1036页

作者： Hong mei sun Mu Jie YANG Qi SHEN Department of Chemistry and Chemical Engineering Suzhou UniversitySuzhou 215006 Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027

Neutral nickel sigma -acetylide complex [Ni(C=CPh)(2)(PBu3)(2)] is a novel initiator for the polymerization of styrene in CHCl3 over a range of polymerization temperature from 40 degreesC to 60 degreesC. The polystyrene obtained was a syndio-rich atactic polymer and its weight-average molecular weight reached 279000. The mechanism of the polymerization was discussed and a radical mechanism was proposed.

关键词： styrene nickel acetylide complex initiator polymerization syndio-rich