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| 1 | EXPERIMENTAL AND NUMERICAL RESEARCH ON BULLDOZER WORKING PROCESS显示文摘A simulative analysis coupled with experiment on behaviors of a soil bed cut by a model bulldozer blade is carried out using the finite element/distinct element method(FE/DEM) facility built in the ELFEN package. Before simulation,the soil specimens are examined through uniaxial tensile/compression,triaxial compression and direct shear tests to obtain model characteristics and relevant parameters,then soil cutting experiments are carried out via a mini-soil bin system with a soil bed of 60/120 mm in width and 10 mm in depth cut by a 1/9 scale model bulldozer blade moving with the velocity of 10 mm/s. The soil constitutive model includes the tensile elastic model for tensile breakage and the compressive elastoplastic relationship with Mohr-Coulomb criterion. The cutting length in simulation is set as 1/4 of that in the experiment divided into 1 869 triangular elements. The comparison between the simulated results and experimental ones shows that the used model is capable of analyzing soil dynamic behaviors qualitatively,and the predicted fracturing profiles in general conform to the experiment. Hence the feasibility for analyzing soil fracturing behaviors in tillage or other similar processes is validated. | LI Yanjie XU Yong HUANG Wenbin FENG Y T OWEN D R J | 2007 | Chinese Journal of Mechanical Engineering2007，20，2： | 3 |
| 2 | Terahertz Semiconductor Quantum Well Devices显示文摘For eventually providing terahertz science with compact and convenient devices,terahertz (1~10THz) quantum-well photodetectors and quantum-cascade lasers are investigated.The design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical phonons.Background limited infrared performance (BLIP) operations are observed for all samples (three in total),designed for different wavelengths.BLIP temperatures of 17,13,and 12K are achieved for peak detection frequencies of 9.7THz(31μm),5.4THz(56μm),and 3.2THz(93μm),respectively.A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is studied.The δ-doping density for each period varies from 3.2×1010 to 4.8×1010cm-2.We observe that the lasing threshold current density increases monotonically with doping concentration.Moreover,the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase monotonically.Interestingly the observed maximum lasing temperature is best at a doping density of 3.6×1010cm-2. | Liu H C Luo H Ban D Waichter M Song C Y Wasilewski Z R Buchanan M Aers G C SpringThorpe A J Cao J C Feng S L Williams B S Hu Q | 2006 | Journal of Semiconductors2006，27，4： | 2 |
| 3 | Smads:transcriptional activators of TGF-β responses 显示文摘 | Zhang Y Feng XH | 1998 | Cell1998，95，6： | 1 |
| 4 | IrrE, a global regulator of extreme radiation resistance inDeinococcus radiodurans, enhances salt tolerance in Escherichia coli and Brassica napus显示文摘 | Pan J Wang J Zhou Z Yan Y Zhang W Lu W Ping S Dai Q Yuan M Feng B Hou X Zhang Y Ma R Liu T Feng L Wang L Chen M Lin M | 2009 | PloS One2009，4，2： | 1 |
| 5 | Tissue-specific effects of reducedβ-catenin expression on adenomatous polyposis coli mutation-instigated tumorigenesis in mouse colon and ovarian epithelium显示文摘 | Feng Y Sakamoto N Wu R | 2015 | PLo S Genet2015，11，10： | 1 |
| 6 | Myocardial ischemia activates an injurious innate immune signaling via cardiac heat shock protein 60 and Toll- like receptor 4显示文摘 | Li Y Si R Feng Y | 2011 | J Biol Chem2011，286，31： | 1 |
| 7 | Blackberry extracts inhibit activating protein 1 activation and cell transformation by perturbing the mitogenic signaling pathway显示文摘 | Feng R Bowman LL Lu Y | 2004 | Nutrition and Cancer2004，50，1： | 1 |
| 8 | Differential effects of enrichment on learning and memory function in NR2B transgenic mice显示文摘 | Wang H Feng R | 2001 | Neuropharmacology2001，41，6： | 1 |
| 9 | Evolutionary tradeoffs for nitrogen allocation to photosynthesis versus cell walls in an invasive plant显示文摘 | Feng Y L Lei Y B Wang R F | 2009 | Proe Natl Acad Sci USA2009，106，6： | 1 |
| 10 | Synthesis of F%OJAPTES/PEG diacid funetionalized magnetic nano- particles for MR imaging 显示文摘 | Feng B Hong R Y Wang L S | 2008 | Colloids and Surfaces A: Physicochemical and Engineering Aspects2008，328，1： | 1 |
| 11 | An augmented spatial digital tree algorithm for contact detection in computational mechanics显示文摘 | Feng Y T Owen D R J | 2002 | International Journal for Numerical Methods in Engineering2002，55，2： | 1 |
| 12 | A robust image hash- ing method based on Zernike moments显示文摘 | Zhao Y Wang S Z Feng G R | 2010 | Journal of Computational Information Systems2010，6，3： | 1 |
| 13 | Curvature-aware adaptive re-sampling for point-sampled geometry显示文摘 | MIAO Y PAJAROLA R FENG J | 2009 | Computer-Aided Design2009，41，6： | 1 |
| 14 | Effectiveness of different processing methods in reducing hydrogen cyanide content of flaxseed显示文摘 | D Y Feng Y R Shen Eduardo R Chavez | 2003 | Journal of the science of food and agriculture2003，83，： | 1 |
| 15 | Estimation of activation energy for permeation in pervaporation process显示文摘 | Feng X Huang R Y M | 1996 | Journal of Membrane Science1996，118，： | 1 |
| 16 | Discrete element simulation of the dynamics of high energy planetary ball milling processes显示文摘 | FENG Y T HAN K OWEN D R J | 2004 | Materials Science and Engineering:A2004，，： | 1 |
| 17 | Evolutionary tradeoffs for nitro- gen allocation to photosynthesis versus cell walls in an invasive plant显示文摘 | Feng Y L Lei Y B Wang R F | 2009 | PANS2009，106，： | 1 |
| 18 | SMB: collision detection based on temporal coherence 显示文摘 | LI C F FENG Y T OWEN D R J | 2006 | Computer Methods in Applied Mechanics and Engineering2006，195，1922： | 1 |
| 19 | Morphology-Based Multifractal Estimat-ion for Texture Segmentation显示文摘 | Xia Y Feng D Zhao R | 2006 | IEEE Trans Image Process2006，15，3： | 1 |
| 20 | Salvinorin A:a novel and highly selective κ-opioid receptor agonist显示文摘 | Feng Y Bryan L R | 2004 | Life Sci2004，75，22： | 1 |
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