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Evaporate prediction and compensation of intake port wall-wetting fuel film for spark ignition engines fueled with ethanol-gasoline blends

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第8期13卷 610-619页

作者： Dong-wei YAO xin-chen ling Feng WU Institute of Power Machinery and Vehicular Engineering Zhejiang UniversityHangzhou 310027China

The fuel dynamic transfer process,including fuel injection,fuel film deposition and evaporation in the intake port,was analyzed for spark ignition(SI) engines with port fuel injection(PFI).The influence of wall-wetting fuel film,especially its evaporation rate,upon the air-fuel ratio of in-cylinder mixtures was also *** to the similarity principle,Fick's law,the ideal gas equation and the Gilliland correlation,an evaporate prediction model of wall-wetting fuel film was set up and an evaporate prediction based dynamic fuel film compensator was *** engine cold start tests,the wall-wetting temperature,which is the key input of the fuel film evaporate prediction model,was also modeled and *** with the experimental data of the evaporation characteristics of ethanol-gasoline blends and engine calibration tests,all the parameters of the wall-wetting fuel film evaporate prediction model used in the fuel film compensator were ***-wave disturbance tests of fuel injection showed that with the help of the fuel film compensator the response of the in-cylinder air-fuel ratio was significantly improved and the real air-fuel ratio always closely matched the expected *** fuel film compensator was then integrated into the final air-fuel ratio controller,and the engine tests showed that the air-fuel ratio control error was less than 2% in steady-state conditions,and less than 4% in transient *** fuel film compensator also showed good adaptability to different ethanol-gasoline blends.

关键词： Spark ignition (SI) engine Ethanol-gasoline blend Wall-wetting effect Evaporate prediction Fuel film compensation

Numerical investigation on the drag force of a single bubble and bubble swarm Authors

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Journal of Hydrodynamics 2020年第6期32卷 1043-1049页

作者： ling-xin Zhang Ze-cai Zhou Xue-ming Shao Department of Engineering Mechanics Zhejiang UniversityHangzhou310027China

The bubble drag force correlation plays an important role in the numerical simulation accuracy of gas/liquid *** order to systematically investigate the interphase drag force of non-buoyancy driven bubbly flows,a dynamic-positioning body force(DPBF)method is developed in this *** is proved that this method has an enough computation *** this method,a series of direct numerical simulation(DNS)cases of a single bubble with low-intermediate Re(1≤Re≤200)and a bubble swarm with low Re(5.6≤Re≤45)are carried out and the bubble drag coefficients are *** on all the DNS data,the drag correlations with dimensionless parameters(Re,We for a single bubble and Re,We,gas fraction for bubble swarm)are systematically investigated and reported in this paper,which can provide a reference to the development of drag force closure model for non-buoyancy driven bubbly flows.

关键词： Gas/liquid flow bubble direct numerical simulation drag force

Aptameric SERS sensor for Hg^(2+) analysis using silver nanoparticles

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Chinese Chemical Letters 2009年第12期20卷 1475-1477页

作者： Guo Qing Wang ling xin Chen Yantai Institute of Coastal Zone Research for Sustainable Development Chinese Academy of Sciences Yantai 264003 China

Aptamer-silver nanoparticles （AgNPs） based surface-enhanced Raman scattering （SERS） sensor has been developed for Hg^2＋ detection by employing the structure-switching aptamer in the presence of spermine. This simple method shows excellent sensitivity and selectivity owing to the sensitive SERS detection technique and high specificity of aptamer for binding Hg^2＋.

关键词： Aptamer AgNPs SERS Hg^2+

Acupuncture Treatment for Post-Stroke Dysphagia: An Update Meta-Analysis of Randomized Controlled Trials

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Chinese Journal of Integrative Medicine 2018年第9期24卷 686-695页

作者： LI ling-xin DENG Kai QU Yun Department of Rehabilitation Medicine West China HospitalSichuan University Department of Gastroenterology West China HospitalSichuan University

Objective： To explore the effectiveness and safety of acupuncture in patients with post-stroke dysphagia by an update meta-analysis. Methods： Potentially eligible RCTs aimed to evaluate the effects of acupuncture vs. non-acupuncture treatments, such as rehabilitation training or routine medication on the swallowing difficulty after stroke were searched from PubMed, Cochrane Library, China National Knowledge Infrastructure, and other database from the earliest record to June 2016. Patient demographics, regimens for acupuncture, type of controls, methods of randomization, and measurements of the clinical symptoms of dysphagia were retrieved. The relative risk （RR） and 95% confidence interval （CI） of effective rate of dysphagia was calculated after intervention performed following admission. Subgroup analyses and a meta- regression analysis were performed to describe the heterogeneity. Results： Twenty-nine RCTs comprising 2,190 patients were included. The included studies had a medium quality grade based on the Consolidated Standards of Reporting Trials （CONSORT） and Standards for Reporting Interventions in Clinical Trials of Acupuncture （STRICTA） checklist. Acupuncture therapy provided a higher effective rate compared with non- acupuncture treatments [RR=1.33, 95% confidence interval （CI）, 1.25 to 1.43]. Subgroup and meta-regression analyses suggested that acupuncture intensity and measurement method were main sources of heterogeneity and resulted in a significant difference for pooled effect size. No severe adverse events were documented in these RCTs. Conclusions： Our meta-analysis provides a new evidence supporting the efficacy and safety of acupuncture in treatment to post-stroke dysphagia in short-term compared with rehabilitation or medication. More high-quality and large-scale research studies are needed.

关键词： acupuncture dysphagia stroke systematic review meta-analysis randomized controlled trials

Evaluation of vibration stress of TA11 titanium alloy blade by quantitative fractography

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Rare Metals 2014年第3期33卷 263-269页

作者： xin-ling Liu Yuan-Ming Xu Chun-Hu Tao Beijing Institute of Aeronautical Materials Aviation Industries of China Key Laboratory of Aeronautical Materials Testing and Evaluation ChinaTao Failure Analysis Center of Aviation Industries of China School of Aeronautical Science and Engineering Beijing University of Aeronautics and Astronautics Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation

Vibration fatigue is the main failure mode of compressor blade. Evaluating the vibration stress of blade that leads to cracking is very useful for analysis of vibration fatigue. In this paper, fatigue stress estimation methods by quantitative fractography were studied through experimental blade and in-service first-stage compressor blade in order to evaluate the initiation vibration stress of in-service blade. The analysis process of initiation vibration stress was established. The evaluating result of vibration stress of in-service blade subjected to centrifugal force and bending vibration stress agrees with aero engine test result. It is shown that the evaluation method can not only evaluate the equivalent fatigue stresses of different crack depths but also yield the initiation equivalent fatigue stress.

关键词： Compressor blade Bending vibration Stress evaluate Quantitative fractography

An experimental study on the velocity fluctuations generated by the flow past fixed spheres

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Journal of Hydrodynamics 2022年第2期34卷 214-225页

作者： ling-xin Zhang xin-sheng Cheng Ze-cai Zhou Qi Gao Xue-ming Shao State Key Laboratory of Fluid Power and Mechatronic Systems Department of MechanicsZhejiang UniversityHangzhou310027China

We perform a series of experiments to study the velocity fluctuations generated by the flow past fixed *** particle image velocimetry(PIV)is carried out to characterize the properties of the liquid *** fluctuation induced by the spheres can be decomposed into the temporal fluctuation and the spatial fluctuation,which represent the contribution of flow instability and spatial inhomogeneity,*** particularly,we focus on the contributions of temporal fluctuations and spatial fluctuations between low and high Reynolds *** low Reynolds number(20200,but not for Re<*** ending scale is aroundλ=0.5d and decreases slightly as Re increases.

关键词： Multiphase flow turbulence modulation particle image velocimetry(PIV)

Data mining in Xu Runsan’s Traditional Chinese Medicine practice:treatment of chronic pelvic pain caused by pelvic inflammatory disease

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Journal of Traditional Chinese Medicine 2019年第3期39卷 440-450页

作者： Liu Liuqing Yang Fang xin ling Jing Yan First Clinical Medical School of Beijing University of Chinese Medicine Beijing 100700 China Traditional Chinese Medicine Gynecology Department China-Japan Friendship Hospital Beijing 100029 China First Affiliated Hospital of Anhui University of Chinese Medicine Hefei 230001 China

OBJECTIVE:To research the Traditional Chinese Medicine(TCM)practice of Professor Xu Runsan for treatment of chronic pelvic pain(CPP)caused by sequelae of pelvic inflammatory disease(SPID)by data ***:The medical records of inpatients at China-Japan Friendship Hospital confirmed to have CPP caused by SPID were collected(274 visits in total).The data extracted from the medical records were analyzed by frequency statistics,correlation analyses,cluster analyses,and complex network ***:The most frequently used medicines were warm medicines,bitter medicines,and medicines distributed to the liver *** most common medicinal combinations were Chishao(Radix Paeoniae Rubra)plus Huangqi(Radix Astragali Mongolici)plus Sanqi(Radix Notoginseng)and Ezhu(Rhizoma Curcumae Phaeocoulis);Guizhi(Ramulus Cinnamomi)plus Fuling(Poria)and Chishao(Radix Poeoniae Rubra);and Chaihu(Radix Bupleuri Chinensis)plus Zhishi(Fructus Aurantii Immaturus)and Gancao(Radix Glycyrrhizae).The most frequently used medicines were divided into four groups according to their efficacy;i.e.,medicines that could(a)warm meridians and free collateral vessels,(b)regulate Qi and free collateral vessels,(c)fortify the spleen and nourish blood and Qi,and(d)tonify Qi and activate *** most commonly used formulations were Guizhi FulingPill and Sini *** core medicines extracted based on complex network analyses were Chishao(Radix Poeoniae Rubra),Sanqi(Radix Notoginseng),Hua ngqi(Radix Astragali Mongolica),Danshen(Radix Salviae Miltiorrhizae),Ezhu(Rhizoma Curcumae Phaeocaulis), Gancao(Radix Glycyrrhizae),Chaihu(Radix Bupleuri Chinensis),Guizhi(Romulus Cinnomomi),Shuizhi(Hirudo), Fuling(Poria),and Zhishi(Fructus Aurantii Immaturus).CONCLUSION:According to the TCM practice of Professor Xui,treatment of CPP caused by SPID should focus on dissolving stasis and obstructions using medicines that can activate blood,resolve stasis,regulate Qi,and dissipate *** prescriptions are of

关键词： Pelvic pain Pelvic inflammatory disease Drugs,Chinese herbal Cluster analysis Complex network analysis

Some results on zeros and uniqueness of difference-differential polynomials

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Applied Mathematics(A Journal of Chinese Universities) 2012年第1期27卷 94-104页

作者： LIU Kai LIU xin-ling CAO Ting-bin Department of Mathematics Nanchang UniversityNanchang 330031China

We consider the zeros distributions of difference-differential polynomials which are the derivatives of difference products of entire functions. We also investigate the uniqueness problems of difference-differential p... 详细信息

关键词： zero sharing value uniqueness difference-differential polynomial.

A Solvothermal Route to Cu_2O Nanocubes and Cu Nanoparticles

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Chemical Research in Chinese Universities 2006年第5期22卷 547-551页

作者： TANG xin-ling REN ling SUN ling-na TIAN Wei-guo CAO Min-hua HU Chang-wen The Institute for Chemical Physics and Department of Chemistry Beijing Institute of Technology Beijing 100081 P. R. China Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

Cu2O nanocubes and Cu nanoparticles were prepared by reducing Cu（ Ⅱ ） salt with ethanol as the reducing agent and solvent in the presence of multidentate ligand poly（vinylpyrrolidone）（PVP） under different conditions. The morphologies and the crystalline structures of the products were characterized by using scanning electron microscopy （SEM）, transmission electron microscopy（TEM）, selected-area electron diffraction（ SAED）, and powder X-ray diffraction（XRD）. In particular, the influences of the solvothennal reaction temperature and alkalinity on the products were investigated. A lower temperature and a lower alkali concentration favor the formation of the Cu2O phase, whereas a higher temperature and a higher alkali concentration generally lead to the formation of the Cu phase.

关键词： Cu2O nanocube Cu nanoparticle Ethanol Poly(vinylpyrrolidone) Selective synthesis