检索结果-南通市图书馆

A new lubrication equation for ultra-thin gas film in hard disk drives

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2004年第z1期47卷 37-44页

作者： peng Yongqing LU Xinchun LUO Jianbin State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China

To overcome the complicated and time-consuming difficulties of current models, a new lubrication equation based on boundary velocity slip model for solving the ultra-thin film gas lubrication in hard disk drives is proposed by adopting the nanoscale effect function, Np. The present model is easy to calculate and applicable at *** results of numerical calculations indicate that the present model produces a close approximation to that of the exact Boltzmann model.

关键词： nanoscale effect, gas film, flying height, Knudsen number, rarefied gas.

Kidney-targeted drug delivery systems

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2014年第1期4卷 37-42页

作者： peng Zhou Xun Sun Zhirong Zhang Key Laboratory of Drug Targeting and Drug Delivery Systems Ministry of EducationWest China School of PharmacySichuan UniversityChengdu 610041China

Kidney-targeted drug delivery systems represent a promising technology to improve drug efficacy and safety in the treatment of renal *** this review,we summarize the strategies that have been employed to develop kidney-targeted drug delivery *** also describe how macromolecular carriers and prodrugs play crucial roles in targeting drugs to particular target cells in the *** technologies render it possible to create renal targeting conjugates and other delivery systems including nanoparticles and liposomes present promising strategies to achieve the goal of targeting drugs to the kidney.

关键词： Kidney-targeted Prodrug Macromolecular carrier Nanoparticles Liposomes

Impurity-Induced Interchain Coupling in[Pt(en)_(2)][Pt(en)_(2)X_(2)](ClO_(4))_(4)

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 Letters 1991年第12期8卷 641-644页

作者： peng Jingcui CCAST(World Laborajry) P.O.Box 8730 Beijing 100080 Department of Applied Physics Hu'nan UniversityChangsha410082

The effect of impurity-induced interchain coupling on polaron in halogen-bridged mixed-valence plattinum complexes(HMPGs)[Pt(en)_(2)][Pt(en)_(2)X_(2)](ClO_(4))_(4) are studied by means of the lakayama,Lin-liu and Maki continuum *** Greenfs function is used to calculate the change of polaronic bind-ing energy due to existing *** results were supported by halogen doping experiment in HMPC's.

关键词： model polaron

An Important Spreading Event of the Neo-Tethys Ocean during the Late Jurassic and Early Cretaceous: Evidence from Zircon U-Pb SHRIMP Dating on Diabase in Nagarze, Southern Tibet

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2006年第4期80卷 522-527页

作者： JIANG Sihong NIE Fengjun HU peng LIU Yan Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037

Widely distributed in Gyangzê-Chigu area, southern Tibet, NW- and nearly E-W-trending diabase（gabbro）-gabbro diorite dykes are regarded as the product of the large-scale spreading of the late Neo-Tethys Ocean. In order to constrain the emplacement age of these dykes, zircons of two samples from diabases in Nagarzê were dated by using the U-Pb SHRIMP method. Two nearly the same weighted mean ^206pb/^23SU ages were obtained in this paper, which are 134.9±1.8 Ma （MSWD=0.65） and 135.5 ± 2.1 Ma （MSWD=1.40）, respectively. They not only represent the crystallization age of the diabase, but also documented an important spreading event of the Neo-Tethys Ocean during the late Jurassic and early Cretaceous. This dating result is of great significance to reconstruct the temporal framework of the late Neo-Tethys Ocean in the Qinghai-Tibet Plateau.

关键词： diabase zircon U-Pb SHRIMP dating spreading event Neo-Tethys Nagarzê southern Tibet

Application of Discrete Lumped Kinetic Modeling on Vacuum Gas Oil Hydrocracking

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2013年第2期15卷 67-73页

作者： Han Longnian Fang Xiangchen peng Chong Zhao Tao Liaoning Shihua University SINOPEC Fushun Research Institute of Petroleum and Petrochemicals

The kinetic model of vacuum gas oil （VGO） hydrocracking based on discrete lumped approach was investigated, and some improvement was put forward at the same time in this article. A parallel reaction scheme to describe the conver- sion of VGO into products （gases, gasoline, and diesel） proposed by Orochko was used. The different experimental data were analyzed statistically and then the product distribution and kinetic parameters were simulated by available data. Fur- thermore, the kinetic parameters were correlated based on the feed property, reaction temperature, and catalyst activity. An optimization code in Matlab 2011b was written to fine-me these parameters. The model had a favorable ability to predict the product distribution and there was a good agreement between the model predictions and experiment data. Hence, the ki- netic parameters indeed had something to do with feed properties, reaction temperature and catalyst activity.

关键词： hydrocracking kinetic modeling vacuum gas oil (VGO) optimization code parallel reaction scheme

microRNAs in cardiac regeneration and cardiovascular disease

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2013年第10期56卷 907-913页

作者： WU GengZe HUANG Zhan-peng WANG Da-Zhi Department of Cardiology Boston Children's HospitalHarvard Medical SchoolBostonMA 02115USA Department of Cardiology Chongqing Institute of CardiologyDaping HospitalThird Military Medical University Harvard Stem Cell Institute Harvard UniversityCambridgeMA 02138USA

microRNAs(miRNAs)are a class of small non-coding RNAs,which have been shown important to a wide range of biological process by post-transcriptionally regulating the expression of protein-coding *** have been demonstrated essential to normal cardiac development and ***,numerous studies indicate miRNAs are involved in cardiac regeneration and cardiac disease,including cardiac hypertrophy,myocardial infarction and cardiac *** observations suggest miRNAs play important roles in *** this review,we summarize the recent progress of studying miRNAs in cardiac regeneration and cardiac *** also discuss the diagnostic and therapeutic potential of miRNAs in heart disease.

关键词： microRNA cardiac regeneration cardiac remodeling cardiovascular disease

Self-assembled zein hydrolysate glycosylation with dextran for encapsulation and delivery of curcumin

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2023年第1期51卷 1255-1265页

作者： Wanying He peng Wang Honglei Tian Ping Zhan College of Food Engineering and Nutritional Science Shaanxi Normal UniversityXi’an710119ShaanxiChina

Curcumin has been widely used to promote human health and nutrition due to its high antioxidant ***,its low solubility and bioaccessbility limit its practical *** this study,we used glycosylated zein hydrolysate to encapsulate hydrophobic curcumin to improve its bioaccessbility and stability at extreme processing *** zein hydrolysate exhibited good amphiphilicity and self-assembly *** nanoparticles,made up of glycosylated zein hydrolysate encapsulated curcumin,had a number-average particle size of 117 nm,polydispersity coefficient(PDI)value of 0.16 and high apparent loading efficiency value of 81%.Under the observation of TEM and AFM,the nanoparticles were spherical,stable and uniform in particle size distribution,and dispersed well in the solution after ***-state fluorescence spectroscopy showed that there is a strong affinity between curcumin and glycosylated zein hydrolysate with Ka value of 3.17×10^(5)M^(-1).The bioaccessbility of nanoparticles was 86%,increasing the bioaccessbility of curcumin by 9 *** covalently bound dextran formd the protective layer on the outside of the nanoparticles,which could effectively resist the destruction of gastric enzymes,significantly increase the retention rate in the gastric digestion stage and achieve release in the intestinal *** addition,the stability of nanoparticles in various environment with different ionic strengths NaCl(~600 mM)/Ca^(2+)(~50 mM)and temperature(~90℃)were significantly enhanced.

关键词： Zein hydrolysates Glycosylation Encapsulation Bioaccessbility Stability

Nocardia cyriacigeorgica infection in a patient with pulmonary sequestration: A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第10期9卷 2367-2372页

作者： Jian Lin Xiao-Mai Wu Min-Fei peng Department of Respiratory and Critical Care Medicine Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical UniversityLinhai 317000Zhejiang ProvinceChina Department of Clinical Laboratory Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical UniversityLinhai 317000Zhejiang ProvinceChina

BACKGROUND Nocardia cyriacigeorgica (N. cyriacigeorgica) infection is uncommon in clinicalpractice. Pulmonary sequestration complicated with N. cyriacigeorgica has notbeen reported in the literature. Here, we present a case of pulmonary sequestrationcomplicated with N. cyriacigeorgica infection in an *** SUMMARYA 37-year-old woman complaining of a recurrent cough was admitted to ourhospital. Pulmonary sequestration in the lower lobe of the left lung wasdiagnosed by enhanced computed tomography. Bronchoalveolar lavage fluid wasthen collected, which showed gram positive bacilli with weakly positive modifiedacid-fast staining. The pathogen was identified as N. cyriacigeorgica after bacterialculture and mass spectrometry analysis. The patient was diagnosed withpulmonary sequestration complicated with N. cyriacigeorgica infection, and hersymptoms quickly improved following anti-infective *** Nocardiosis is considered to be an opportunistic infection. This is the first reportof pulmonary sequestration complicated with N. cyriacigeorgica infection in apatient with normal immunity.

关键词： Nocardia Infection Pulmonary sequestration Nocardia cyriacigeorgica Lung Case report

Controlling a peristaltic robot inspired by inchworms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomimetic Intelligence & Robotics 2024年第1期4卷 88-96页

作者： Yanhong peng Hiroyuki Nabae Yuki Funabora Koichi Suzumori Department of Information and Communication Engineering Graduate School of EngineeringNagoya UniversityNagoya 464-8601Japan Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo 152-8550Japan

This study presents an innovative approach in soft robotics,focusing on an inchworm-inspired robot designed for enhanced transport *** explore the impact of various parameters on the robot’s performance,including the number of activated sections,object size and material,supplied air pressure,and command execution *** a series of controlled experiments,we demonstrate that the robot can achieve a maximum transportation speed of 8.54 mm/s and handle loads exceeding 100 g,significantly outperforming existing models in both speed and load *** findings provide valuable insights into the optimization of soft robotic design for improved efficiency and adaptability in transport *** research not only contributes to the advancement of soft robotics but also opens new avenues for practical applications in areas requiring precise and efficient object *** study underscores the potential of biomimetic designs in robotics and sets a new benchmark for future developments in the field.

关键词： McKibben artificial muscles Bionics Soft robotics Soft actuator Bio-inspired robotics