检索结果-南通市图书馆

A HIGHLY ACCURATE NUMERICAL METHOD FOR FLOW PROBLEMS WITH INTERACTIONS OF DISCONTINUITIES

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2002年第1期20卷 1-14页

作者： Xiao-nan Wu You-lan zhu Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong Department of Mathematics University of North Carolina at CharlotteCharlotteNC 28223

Focuses on a study wherein a type of shock fitting method has been used to solve dimensional flow problems with interactions of various discontinuities. Discretization of the transformed equations; Numerical results; ... 详细信息

关键词： interaction of discontinuity shock-fitting shock-capturing

Use of N,O-carboxymethyl chitosan to prevent postsurgical adhesions in a rabbit double uterine horn model： a randomized controlled design

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2016年第5期59卷 504-509页

作者： Chang Ren Dachun Zhao lan zhu Departments of Obstetrics & Gynecology Peking Union Medical College Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beiiing 100730 China Departments of Pathology Peking Union Medical College Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100730 China

In previous studies, N,O-carboxymethyl chitosan has been shown to decrease the incidence and intensity of abdominal adhesions. In the present study, adhesions were induced in 220 rabbits using a double uterine horn model. Rabbits were randomized to receive an operation only or an operation+medical chitosan intraperitoneally. Twenty-two rabbits from each group were euthanized at one of five different times(Day 3, 7, 14, 28, or 42), and adhesion formation was given gross and histopathological scores. Reductions were observed in adhesion extent(P=0.0337) and tenacity(P=0.0271) as well as inflammation(P<0.0001) on Day 3 when medical chitosan was applied. Prior to Day 14, fibrosis was less obvious in the medical chitosan group(P<0.0005). The tenacity scores were significantly lower in the medical chitosan group following Day 14(P<0.05), while the type scores were lower in the medical chitosan group following Day 28(P<0.03). Thus, medical chitosan decreased both the gross and the histopathological scores of the induced adhesions.

关键词： postsurgical adhesion adhesion prevention N O-carboxymethyl chitosan rabbit double uterine horn model random-ized controlled trial

Study on the critical diameter of the subway tunnel based on the pressure variation

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第10期57卷 2037-2043页

作者： SUN ZhenXu YANG GuoWei zhu lan Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of Mechanics Chinese Academy of Sciences Beijing Rail and Transit Design & Research Institute CO.LTD

When the subway train operates at a speed higher than 100 km/h,the corresponding aerodynamic issue becomes *** meet the future requirement for the speedup of subway trains,a research on the critical diameters of the subway tunnel for trains operating at 120 and 140 km/h has been performed based on passengers’aural discomfort caused by rail tunnel pressure variation.A three-dimensional computational fluid dynamic approach has been adopted for ***,trains with different airtight indices are considered and the pressure variations inside and outside the trains are both under *** on the corresponding criteria for different airtight indices,critical tunnel diameters for trains running at different speeds have been *** study would aid in the tunnel section design for future high-speed subway trains.

关键词： tunnel pressure waves airtight index aural discomfort blockage ratio

Update on Mayer—Rokitansky—Küster—Hauser syndrome

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2022年第6期16卷 859-872页

作者： Na Chen Shuang Song Xinmiao Bao lan zhu National Clinical Research Center for Obstetric and Gynecologic Diseases Department of Obstetrics and GynecologyState Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical SciencesBeijing100730China Peking Union Medical College M.D.ProgramBeijing100730China

This review presents an update of Mayer—Rokitansky—Küster—Hauser(MRKH)syndrome on its etiologic,clinical,diagnostic,psychological,therapeutic,and reproductive *** etiology of MRKH syndrome remains unclear due to its intrinsic *** and genetic causes that may interact during the embryonic development have been proposed with no definitive etiopathogenesis *** proportion of concomitant extragenital malformations varies in different studies,and the discrepancies may be explained by ethnic *** addition to physical examination and pelvic ultrasound,the performance of pelvic magnetic resonance imaging is crucial in detecting the presence of rudimentary uterine *** syndrome has long-lasting psychological effects on patients,resulting in low esteem,poor coping strategies,depression,and anxiety *** psychological counseling and peer support to diagnosed patients is *** and timely psychological intervention could significantly improve a patient’s *** nonsurgical and surgical methods have been suggested for treatment of MRKH *** to the high success rate and minimal risk of complications,vaginal dilation has been proven to be the first-line *** is the second-line option for patients experiencing dilation *** transplantation and gestational surrogacy are options for women with MRKH syndrome to achieve biological motherhood.

关键词： MRKH(Mayer-Rokitansky-Küster-Hauser)syndrome etiology clinical characteristic diagnosis treatment psychological effect

Analysis of Amino Acids in a Single Human Red Blood Cell by Capillary Zone Electrophoresis with Intracellular NDA- derivatization and Electrochemical Detection

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第7期13卷 655-657页

作者： Qian DONG Xiao Lei WANG lan lan zhu Wen Rui JIN School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100

A novel method for determination of amino acids in individual human red blood cells has been developed. In this method, the derivatization reagents (NDA and CN-) are introduced into living cells by electroporation. After completion of derivatization, the amino acids in a single cell is determined by capillary zone electrophoresis with end-column amperometric detection.

关键词： Capillary electrophoresis electrochemical detection single cell analysis amino acid.

Growth responses of gypsy moth larvae to elevated CO2： the influence of methods of insect rearing

在线全文

学校读者我要写书评

暂无评论

Insect Science 2011年第4期18卷 409-418页

作者： lan-zhu Ji Lin-Li An Xiao-Wei Wang Biodiversity Group Institute of Applied Ecology Chinese Academy of Sciences Shenyang China

The effects of elevated CO2 on foliar chemistry of two tree species （Populus pseudo-simonii Kitag. and Betula platyphylla） and on growth of gypsy moth （Lymantria dispar L.） larvae were examined. Furthermore, we focused on the comparison of results on the growth responses of larvae obtained from two methods of insect rearing, the nochoice feeding trial performed in the laboratory or in situ in open-top chambers. On the whole, both primary and secondary metabolites in the leaves of the two tree species were significantly affected by main effects of time （sampling date）, CO2 and species. Elevated CO2 significantly increased the C： N ratio and concentrations of the soluble sugar, starch, total nonstructural carbohydrates, total phenolics and condensed tannins, but significantly decreased the concentration of nitrogen. Higher contents of total phenolics and condensed tannins were detected in the frass of larvae reared in elevated CO2 treatments. Overall, the growth of gypsy moth larvae were significantly inhibited by elevated CO2 and CO2- induced changes in leaf quality. Our study did not indicate the two methods of insect rearing could influence the direction of effects of elevated CO2 on the growth of individual insects; however, the magnitude of negative effects of elevated CO2 on larval growth did differ between the two insect rearing methods, and it seems that the response magnitude was also mediated by larval age and host plant species.

关键词： elevated CO2 leaf quality Lymantria dispar no-choice feeding open-topchamber

Current Situation of Transvaginal Mesh Repair for Pelvic Organ Prolapse

维普期刊数据库评论

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 Sciences Journal 2014年第3期29卷 188-190页

作者： lan zhu Lei Zhang Department of Obstetrics and Gynecology Peking Union Medical College Hospital Chinese Academy of Medical Sciences & Peking Union Medical College

SURGICAL mesh is a metallic or polymeric screen intended to be implanted to reinforce soft tissue or bone where weakness exists. Surgical mesh has been used since the 1950s to repairabdominal hernias. In the using surgical mesh products 1970s, gynecologists began to indicate the repair of pelvic organ prolapse （POP）, and in the 1990s, gynecologists began using surgical mesh for POP. Then the U.S. Food andDrug Administration （FDA） approved the first surgical mesh product specifically for use in POP.

关键词： pelvic organ prolapse vaginal mesh complication

Modeling the performance of air filters for cleanrooms using lattice Boltzmann method

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2021年第2期14卷 317-324页

作者： Bin Zhou Xiao Wu Long Chen Jia-Qi Fan lan zhu Department of HVAC College of Urban ConstructionNanjing Tech University211816NanjingChina National Air Cleaner&Gas Detect Production Quality Supervision and Inspection Center(Jiangsu) SuzhouChina

Air filters with a low resistance,high filtration efficiency,and long lifetime are important to ensure good indoor air *** this study,the lattice Boltzmann method is applied on six types of fibrous filter media with lognormal-distribution models,which consider the influence of the solid fraction,number of fibers,and average fiber *** influences of the filtration velocity and fiber layout on the resistance,efficiency,and quality factor are *** resistance is found to be relatively low when the solid fraction inside the filter media is uniformly *** filter media with a random lognormal-distribution model demonstrated the best filtration performance in terms of quality ***,when the solid fraction is uniform along the thickness of the filter media,the comprehensive filtration performance is the best when a small fiber is near the inlet and a large one is close to the *** study provides a viable numerical method for performance optimization of air-filtration devices for the next-generation cleanroom industry.

关键词： LBM resistance filtration efficiency numerical simulation quality factor

Research on conductive-material-filled electrodes for sidewall insulation performance in micro electrochemical machining

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Manufacturing 2023年第3期11卷 509-522页

作者： Guo-Dong Liu Yu-lan zhu Sheng-Gui Liu Chao-Jiang Li School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081People's Republic of China Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Department of Mechanical EngineeringTsinghua UniversityBeijing 100084People's Republicof China

In micro electrochemical machining(ECM)processes,stray corrosion causes undesired metal dissolution and the deterioration of shape *** a sidewall-insulated electrode is an effective approach to suppressing stray *** sidewall-insulated electrodes are made of metal substrate and non-metallic thin ***,the thin-film insulating materials attached to a metal substrate are susceptible to damage in an electrolytic *** study presents a novel concept of the conductive-material-filled electrode for better sidewallinsulation *** micro-scale quartz tube serves as the insulating *** available conductive fillers including metal wire,molten metals,and silver powder are filled inside the working cathode of the quartz ***,the metal-wire-filled electrode,moltenmetal-filled electrode,and nano-powder-filled electrode are designed and *** the verification results of electrode toughness,material removal rate,and surface topography,the metal-wire-filled electrode and moltenmetal-filled electrode exhibit the same performance as a traditional metal-based electrode and much better *** contrast,the nano-powder-filled electrode is unable to withstand long-term ECM processes because of the loss of cured powder *** ECM experiments,microstructures with steep sidewalls(taper angle<9.7°)were machined using the metal-wire-filled electrode and molten-metal-filled electrode,which could replace the traditional electrode,achieving a longer service life and superior sidewall-insulation performance.

关键词： Electrochemical machining(ECM) Conductive-material-flled electrode Stray corrosion Sidewall insulation Quartz substrate