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Now showing items 129 - 144 of 954

  • CONSTRAINTS ON NON-FLAT COSMOLOGIES WITH MASSIVE NEUTRINOS AFTER\r PLANCK\r 2015

    Chen, Yun   Ratra, Bharat   Biesiada, Marek   Li, Song   Zhu, Zong-Hong  

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  • Experimental and Modeling Study of Breakup Behavior in Silicone Jet Dispensing for Light-Emitting Diode Packaging

    Chen, Yun   Wang, Fuliang   Li, Han-Xiong  

    Silicone jet dispensing has grown increasingly common in light-emitting diode (LED) packaging owing to its high speed and low cost. However, differences in breakup behavior result in different silicone jetting volumes that create challenges in maintaining dispensing volume consistency during silicone jet dispensing process; this severely affects the performance of LED packaging. To reveal the breakup behavior during the jet dispensing process, the experimental and modeling studies were conducted. First, the ultrafast breakup process was experimentally observed using a high-speed camera, which shows that this process only requires approximately 50 ms. Then, an analytical model was developed and verified through an experiment. Using this analytical model, the effects of initial disturbance amplitude, initial disturbance wavelength, and thread length on the thread breakup were studied. The simulation demonstrated that it is necessary to control the disturbance amplitude under 0.005 for volume consistency in jet dispensing; thus, a moving work piece rather than a moving nozzle is recommended in jet dispensing. A disturbance wavelength between 0.3 and 0.6 mm is beneficial for both thread breakup and high-volume consistency. Thread length has little effect on the breakup position but significant effects on the volume consistency and breakup time. A low substrate increases the volume and the consistency of thread breakup. This paper will provide a useful guide for dispenser designs of modern LED packages.
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  • Establishment and characterization of a rectal cancer model in mice: application to cytokine gene therapy

    Chen, Yun   Chang, King-Jen   Hwang, Lih-Hwa   Chen, Chiung-Nien   Tseng, Sheng-Hong  

    Background and aims: We established an orthotopic animal model of rectal cancer in mice and applied this model to the study of the antitumor effects of cytokine-assisted tumor vaccine. Materials and methods: The CT-26 murine colon adenocarcinoma cells were inoculated into the submucosa of the rectum of the mice to induce the rectal tumor. The tumor growth rate and the survival time of the mice were observed. The cDNA of granulocyte-macrophage colony-stimulating factor (GM-CSF) was transduced to the CT-26 cell line via a retroviral vector, and the therapeutic effects of irradiated GM-CSF secreting tumor vaccine on the rectal tumor were investigated. Results: All the mice implanted with the wild-type tumor cells had tumor growth in the rectum and died. The mean survival time of the mice was 28.9 days. Two doses of irradiated GM-CSF secreting tumor vaccine administered on days 0 and 3 after tumor cell implantation significantly prolonged the survival of the mice with rectal tumor compared with that of the control groups (P<0.0001). In contrast, no antitumor effect was observed when the treatment with GM-CSF secreting tumor vaccine was delayed to 3 days after tumor cell implantation (P>0.17). Conclusion: The results suggest that cytokine gene therapy exerts an antitumor effect on small tumors and may be considered as an adjuvant immunotherapy of rectal cancers and prevention of reimplantation of tumor cells disseminated during or following surgery. The orthotopic animal model of the rectal cancer in mice could be applied to the in vivo experimental studies of rectal cancer.
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  • Graphene oxide-modified electrospun polyvinyl alcohol nanofibrous scaffolds with potential as skin wound dressings

    Zhang, Qiang   Du, Qiaoyue   Zhao, Yanan   Chen, Feixiang   Wang, Zijian   Zhang, Yaxing   Ni, Hong   Deng, Hongbing   Li, Yinping   Chen, Yun  

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  • Impact of psychological health on peripheral endothelial function and the HPA-axis activity in healthy adolescents

    Chen, Yun   Osika, Walter   Dangardt, Frida   Friberg, Peter  

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  • Development of an anaerobic co-metabolic model for degradation of phenol, m-cresol and easily degradable substrate

    Chen, Yun   He, Jia   Wang, Yun-Qi   Kotsopoulos, Thomas A.   Kaparaju, Prasad   Zeng, Raymond J.  

    Highlights • A modified ADM1 model was built to simulate anaerobic degradation of phenolic wastewater. • The mutual inhibition parameters between phenol and m-cresol were introduced into ADM1. • Co-metabolism between refractory substrates and easily degradable substrates were developed. • The model simulation fitted the experimental data well. • The developed model can be a useful tool to design operation conditions for phenol degradation. Abstract Phenol and m-cresol are common and refractory organic wastes in industrial wastewater. Anaerobic digestion is one of the most widespread technologies in dealing with this kind of wastewater. For the purpose of providing more useful information for the design and operation of the biodegradation trials of phenolic wastewater, two new modified Monod-type kinetics, the mutual inhibition between phenol and m-cresol, the co-metabolism between refractory substrates and easily degradable substrates were developed to simulate existing experimental data. Parameter K and parameters of mutual inhibition I are introduced to successfully present the promoting impact and mutual inhibition, respectively. The results of the simulations reproduce well the experimental data and therefore the developed model was validated. Based on the experimental data and model predictions from this study, it can be concluded that m-cresol affects the degradation of phenols and that the present of an easily biodegradable compound accelerates phenol degradation. The developed model can be used as a useful tool by the treatment plant operators in order to design optimal operation conditions for phenol degradation. Graphical abstract
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  • A quantitative phase-field model combining with front-tracking method for polycrystalline solidification of alloys

    Chen, Yun   Qi, Xin Bo   Li, Dian Zhong   Kang, Xiu Hong   Xiao, Na Min  

    Highlights • A novel quantitative phase-field model for polycrystalline growth of alloys is proposed. • The model combines the advantages of phase-field and front tracking methods. • The model has a high computing efficiency on simulation of many crystals during solidification. Abstract As the orientation of an individual crystal is constant in solid and diffusive interface layer, a sharp interface model can be coupled to calculate the orientation in phase-field simulation of polycrystalline growth. Here, a two-dimensional phase-field model in combination with the front-tracking method is provided for simulating polycrystalline growth during solidification. In this model, the quantitative phase-field formulations for slow solidification of dilute binary alloys are employed to describe the dynamical evolution of diffusive solid–liquid interface while the front-tracking method is utilized to track the spatial dependent orientation of each grain. Because of the high computing efficiency that is resulted from only one order parameter used to depict the phase transformation during solidification, the model overcomes the disadvantage of reported phase-field approaches for polycrystalline growth. The built model was firstly solved to simulate a free equiaxed dendrite with different orientations growing from undercooled melt for benchmarking. The comparison results indicate that the model is able to compute the orientation exactly. Secondly, the model was extended to simulate the solidification with many equiaxed dendrites. The growth behaviors of the simulated crystals were characterized and analyzed, which demonstrate that the model is feasible to quantitatively and efficiently predict growth dynamics of crystals in a large number and scale during solidification of alloys. Graphical abstract
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  • pH Effect on the Separation of Uranium Fluoride Effluents by the Reverse Osmosis Process

    Chen, Yun   Chu, Min-Lin   Shieh, Mu-Chang  

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  • Synthesis and characterization of new ferroelectric liquid crystals containing oligomethylene spacers

    CHEN, YUN   WU, WEI-JEN  

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  • Fabricating and Controlling Silicon Zigzag Nanowires by Diffusion-Controlled Metal-Assisted Chemical Etching Method

    Chen, Yun   Zhang, Cheng   Li, Liyi   Tuan, Chia-Chi   Wu, Fan   Chen, Xin   Gao, Jian   Ding, Yong   Wong, Ching-Ping  

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  • Heterogeneous recurrence representation and quantification of dynamic transitions in continuous nonlinear processes

    Chen, Yun   Yang, Hui  

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  • Chen Yun\"s Strategy for China\"s Development. A Non-Maoist Alternativeby N.R. Lardy; K. Lieberthal

    Review by: Maria Weber  

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  • METHOD AND APPARATUS FOR MAPPING AND DE-MAPPING IN PHYSICAL CHANNELS OF HIGH SPEED PHYSICAL DOWNLINK SHARED CHANNEL

    Provided are a method and an apparatus for mapping and de-mapping in physical channels of the high speed physical downlink shared channel (HS-PDSCH), which meet mapping requirement of the physical channels for bearing power control and synchronization control signaling in the physical channels of HS-PDSCH, at the same time are compatible with mapping requirement of the physical channels with no bearing power control and synchronization control signaling in the physical channels of the HS-PDSCH. Once introducing power control and synchronization control signaling to the physical channels of the HS-PDSCH is implemented, a terminal can also de-mapping the demodulated data on each physical channel accordingly.
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  • HIGH-SPEED PLATFORM MOVEMENT PARAMETER SELF-TUNING METHOD BASED ON MODEL IDENTIFICATION AND EQUIVALENT SIMPLIFICATION

    A high-speed platform movement parameter self-tuning method based on model identification and equivalent simplification, comprising: establishing test on a movement state of a high-speed platform, identifying a model parameter, and optimizing a movement parameter of an equivalent simplified model; selecting any one movement function from a pre-set parametric curve, setting an initial parameter, and driving the high-speed platform to move under the action of a controller and a driver; collecting dynamic response information of the platform, and calculating dynamic characteristic information such as rigidity, frequency, and damping of the platform; and establishing a dynamic response equivalent simplified model by using the acquired dynamic characteristic information, and optimizing the movement parameter in a selected parametric movement function by restricting to meet the movement accuracy and aiming at a shorter execution time, so as to obtain an optimal parameter.
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  • Comparison of Bush Sophora Root polysaccharide and its sulfate\"s anti-duck hepatitis A virus activity and mechanism

    Chen, Yun   Xiong, Wen   Zeng, Ling   Wang, Deyun   Liu, Jiaguo   Wu, Yi   Hu, Yuanliang  

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  • Evaluation of geothermal development in fractured hot dry rock based on three dimensional unified pipe-network method

    Chen, Yun   Ma, Guowei   Wang, Huidong   Li, Tuo  

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