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Search Results: 1 - 10 of 52275 matches for " Xiu Tian Yan "
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Functional design method for improving safety and ergonomics of mechanical products  [PDF]
Aurélie Robert, Sébastien Roth, Dominique Chamoret, Xiu Tian Yan, Francois Peyraut, Samuel Gomes
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.58058
Abstract: In order to help companies to improve their competetiveness, it is important to develop new design methodologies. In this framework, a Functional And Robust Design (FARD) methodology dedicated to routine design of “highly productive” modular product ranges is proposed including principles of functional analysis, Design For Assembly (DFA), and techniques of modelling and simulation for ergonomics consideration. This paper focuses on the application of this original method applied to mechanical vibration and ergonomics problems of a scraper. Including biomechanical aspect in the design methodology, it is possible to identify the impact of a vibration tool on its users using numerical models of the tool coupled to a finite element model of the human hand. This method can proactively warn very early, in the design process, the risks of causing musculoskeletal disorders and facilitate an optimization of the mechanical tool. This study is a first step in a context of human-centered design.
Experiment Study on Friction Reduction of Ultrasonic Vibration Based on Traveling Wave Ultrasonic Motor

QU Jian-jun,TIAN Xiu,SUN Feng-yan,

摩擦学学报 , 2007,
Abstract: A geometric model of friction reduction of ultrasonic vibration based on traveling wave ultrasonic motor(TWUSM) is presented.Three driving conditions were adopted to drive the rotor of TWUSM to simulate the frictional driving characteristics of the TWUSM,which was driven by electromagnetic motor,by electromagnetic motor combining with one phase standing ultrasonic wave,and by TWUSM respectively.The experimental rig was used to simulate the friction characteristics of the TWUSM.A conception of friction coefficient reduction rate of ultrasonic vibration was introduced.Effects of the speed of electromagnetic motor,pre-load,exciting voltage and friction materials on friction coefficient of the friction couple of stator and rotor are experimentally investigated respectively.The phenomena of friction reduction in ultrasonic drive was obvious at high relative sliding speed,small pre-load,and large vibration amplitude of ultrasonic vibration.
Effect of Application Mode of Friction Material on Driving Characteristics of Ultrasonic Motor

WANG Yan-li,QU Jian-jun,TIAN Xiu,
,曲建俊,田 秀

摩擦学学报 , 2010,
Abstract: Friction material is one of the most important parts in ultrasonic motor. Its application modes affect directly the characteristics of ultrasonic motor. Using two traveling wave ultrasonic motors which the friction material was applied on rotor and stator, respectively, then the rotor and stator were matched with their corresponding stator and rotor to simulate the contact behavior of ultrasonic motor. The variations of load and wear properties of ultrasonic motor with the application modes of friction material were studied. Impedance characteristics of the stator were measured by impedance analyzer before and post applying on friction material layer. The unworn and worn surface morphologies and surface roughness of contact surfaces of the two ultrasonic motors were studied by metalloscope and JB-4C precision roughness instrument. The wear mechanism was analyzed. The results showed that resonance frequency of stator with friction material on decreased slightly. The motor with friction material applied on stator obtained higher stall torque at two ultrasonic motors without loading at same speed. Polishing wear was the dominant mechanism of the stator with friction material, while ploughing wear was the dominant mechanism of the rotor with friction material.
Antitumor Activity of T Cells Generated from Lymph Nodes Draining the SEA-expressing Murine B16 Melanoma and Secondarily Activated with Dendritic Cells
Jiyun Yu, Rong Tian, Bingshui Xiu, Jinqi Yan, Rui Jia, Liang Zhang, Alfred E. Chang, Hongbin Song, Qiao Li
International Journal of Biological Sciences , 2009,
Abstract: The successful use of tumor-draining lymph nodes (TDLN) as a source of effector cells for cancer immunotherapy depends largely on the immunogenicity of the tumor drained by the lymph nodes as well as the methods for secondary in vitro T cell activation and expansion. We transferred the bacterial superantigen staphylococcal enterotoxin A (SEA) gene into B16 murine melanoma tumor cells, and used them to induce TDLN (SEA TDLN) in syngeneic hosts. Wild-type (wt) TDLN induced by parental B16 tumor was used as a control. In vitro, SEA TDLN cells proliferated more vigorously, produced more IFNγ and demonstrated higher CTL activity than wt TDLN cells when activated with anti-CD3/anti-CD28/IL-2. In vivo, SEA TDLN cells mediated tumor eradication more effectively than similarly activated wt TDLN cells (p<0.01). Furthermore, use of dendritic cells (DC) plus tumor antigen in vitro in addition to anti-CD3/anti-CD28/IL-2 stimulation further amplified the immune function and therapeutic efficacy of SEA TDLN cells. DC-stimulated SEA TDLN cells eliminated nearly 90% of the pulmonary metastasis in mice bearing established B16 melanoma micrometastases. These results indicate that enforced expression of superantigen SEA in poorly immunogenic tumor cells can enhance their immunogenicity as a vaccine in vivo. The combined use of genetically modified tumor cells as vaccine to induce TDLN followed by secondary stimulation using antigen-presenting cells and tumor antigen in a sequential immunization/activation procedure may represent a unique method to generate more potent effector T cells for adoptive immunotherapy of cancer.
Study of Structure and Dielectric Properties of (Ba1―xCax)(Ti0.82Zr0.18)O3 Ceramics
NA Wen-Ju, DING Shi-Hua, SONG Tian-Xiu, WANG Jiu-Shi, WANG Yan
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.00655
Abstract: (Ba1―xCax)(Ti0.82Zr0.18)O3(BCZT, 0≤x≤0.26) ceramics was prepared by a solid phase reaction. The effect of Ca2+ doping on the microstructure and dielectric properties of the ceramics was studied. Results showed that the solid solubility lay around x=0.16 for BCZT ceramics while the second phase was observed. The value of c/a changed as the U―type curve with the variation of the Ca2+, and the minimum of the c/a was 1.00276 at x=0.06. It was found that Ca2+ ion substitution can be almost incorporated into the A site by the calculation of the tolerance factor and lattice constant. With increasing Ca2+ ion content, the grain size was decreased. The Curie temperature was shifted to low temperature, and the εr―T peak was decreased and broaden. The relaxor characteristics were obtained while Ca2+ ion content was further increased.
Growing Season Carbon Dioxide Exchange in Flooded Non-Mulching and Non-Flooded Mulching Cotton
Zhi-guo Li, Run-hua Zhang, Xiu-jun Wang, Fang Chen, Chang-yan Tian
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050760
Abstract: There is much interest in the role that agricultural practices might play in sequestering carbon to help offset rising atmospheric CO2 concentrations. However, limited information exists regarding the potential for increased carbon sequestration of different management strategies. The objective of this study was to quantify and contrast carbon dioxide exchange in traditional non-mulching with flooding irrigation (TF) and plastic film mulching with drip irrigation (PM) cotton (Gossypium hirsutum L.) fields in northwest China. Net primary productivity (NPP), soil heterotrophic respiration (Rh) and net ecosystem productivity (NEP) were measured during the growing seasons in 2009 and 2010. As compared with TF, PM significantly increased the aboveground and belowground biomass and the NPP (340 g C m?2 season?1) of cotton, and decreased the Rh (89 g C m?2 season?1) (p<0.05). In a growing season, PM had a higher carbon sequestration in terms of NEP of ~ 429 g C m?2 season?1 than the TF. These results demonstrate that conversion of this type of land use to mulching practices is an effective way to increase carbon sequestration in the short term in cotton systems of arid areas.
Research on Transplanted Design of Mobile-Terminal-Based Educational Games  [PDF]
Yan Gu, Na Tian
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.25005
Abstract: The number of educational games developed in mobile terminals becomes more and more. The types can be divided into transplanted development and innovative development. Transplanted design is based on existed educational games, and the games are redesigned into mobile terminals, but they have problems about poor user experience and too many similarities between them. This paper analyses the causes of these phenomena and gives some suggestions. According to games from personal computers, their interaction styles should be redesigned.
Cytotoxic Metabolites from the Soil-Derived Fungus Exophiala Pisciphila
Cui-Cui Wang,Hai-Zhou Liu,Ming Liu,Yu-Yan Zhang,Tian-Tian Li,Xiu-Kun Lin
Molecules , 2011, DOI: 10.3390/molecules16042796
Abstract: A new polyketide compound 1 and a new naturally occurring chromone derivative 2, along with two known indole alkaloids 3–4 were characterized from the ethyl acetate extract of a soil-derived fungal strain, Exophiala pisciphila PHF-9. The structures of compounds 1–4 were established by detailed spectroscopic analysis and comparison with literature data. The absolute configuration of 1 was determined by a modified Mosher’s method. Compound 1 exhibited moderate cytotoxicity against A-549, Hela, PANC-28 and BEL-7402 cell lines.
Genome Shuffling and Its Prospect for Strain Improvement in Ethanol Production from Lignocellulosic Hydrolysates

ZHANG Zuo-Yang,TIAN Shen,MENG Fan-Yan,YAN Fei,LI Feng-Tian,YANG Xiu-Shan,
,田 沈,孟繁艳,闫 飞,李丰田,杨秀山

微生物学通报 , 2009,
Abstract: Commercial production of bioethanol from lignocellulosic hydrolysates requires efficient fermenting strains. The abilities of the strain to converting all types of sugars in the hydrolysate to ethanol in high yield and to effectively tolerating/metabolizing inhibitors are necessary. Genome shuffling is a novel method for breeding, and it has been applied in pharmaceutical and food industry. This review summarized the technique of genome shuffling including principle, process, applications and its prospect for strains improvement in ethanol production from lignocellulosic hydrolysates.
Effect of mechanical wounding on glucosinolate content and composition in rosette leaves of Arabidopsis thaliana

TIAN Yun-Xia,DAI Shao-Jun,CHEN Si-Xue,YAN Xiu-Feng,

生态学报 , 2009,
Abstract: 植物可以利用体内次生代谢产物的变化来抵御昆虫取食和机械损伤.芥子油苷是拟南芥的主要次生代谢产物.通过剪刀剪取叶片(40%面积)对温室培养的拟南芥幼苗莲座叶进行机械损伤处理,观察机械损伤后8个时间点拟南芥叶片中不同种类芥子油苷含量和组合模式的变化.结果表明机械损伤后3 h叶片中芥子油苷总含量开始明显上升,脂肪族和吲哚族芥子油苷含量在损伤后3 h也都显著高于损伤前.在检测到的12种芥子油苷中,4-甲基亚磺酰丁基芥子油苷(4-methylsulphinylbutyl GS,4MSOB)的含量最多,占芥子油苷总量的48.5%,并且在损伤3 h后含量增加.4MSOB含量的变化成为影响莲座叶中芥子油苷组合模式的主导因素.其它各种芥子油苷在损伤后不同时间点的变化也存在差异.
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