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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 | Variations in Wool Growth with Nutrient Supply in Northern China显示文摘Field studies on essessment of nutritional status of the grazing sheep were carried out in each of the three major grassland regions, the eastern Inner Mongolia and beyond grassland, the Inner Mongolia - Ningxia - Gansu grassland and the Xinjiang grassland, in northern China. The results obtained showed that the wool production of fine wool sheep in these regions varied between regions and seasons, with similar seasonal patterns in all regions and that reducing the seasonal variations in nutrient supply would enhance wool production substantially. Nutritional limitations to wool growth of the grazing sheep in these regions were suggested, those were: the shortage of protein supply in winter and early spring; the poor quality of much of the pasture and the hay used as supplements, the low energy intake during winter which probably necessitated the use of body stores to maintain body temperature. | D X Lu,Iner(Mongolia Academy of Animal Sciences.Hohhot City.Inner Mongolia Autgolia Autonmous Region.PRC)Z C Feng,(Mongolia Academy of Animal Sciences.Hohhot City.Inner Mongolia Autgolia Autonmous Region.PRC)H R Wang,(Mongolia Academy of Animal Sciences.Hohhot City.Inner Mongolia Autgolia Autonmous Region.PRC)R Z Yang,(Xinjiang Institute of Animal Science.Xinjiang Academy of Animal Science.Yiu Hou Road.Urumqi.Xinjiang Uygur Autonomous Region PRC)C T Ma,(Chinese Academy of Agricultural Sciences.Lanzhou.Gansu.PRC)D B Purser,(CSIRO Division of Animal Production.Laboratory for Rural Research.Private Bag.P.O.Wembley.Western Australia 6014)J R Lindsay(CSIRO Division of Animal Production.Laboratory for Rural Research.Private Bag.P.O.Wembley.Western Australia 6014)D W Peter(CSIRO Division of Animal Production.Laboratory for Rural Research.Private Bag.P.O.Wembley.Western Australia 6014) | 1997 | 畜牧与饲料科学1997，22，S1： | 3 |
| 3 | 全颗粒饲料对奶牛生产性能的影响显示文摘饲料中的中性洗涤纤维(NDF)含量和饲料颗粒直径是影响瘤胃功能的重要因素。试验评估了以颗粒饲料为主的奶牛瘤胃健康情况、NDF消化率和生产性能。选取8头荷斯坦母牛(336±30 d,体重346±35 kg),随机分配到交叉重复试验组中,奶牛安置于牛栏,自由采食。试验期为3周,前两周是适应期,最后一周为数据收集期。各组饲粮原料相同,但物理形式不同,分为全混合日粮(TMR)和颗粒料(直径=8 mm)。两组间物理有效NDF(pe NDF)不同,TMR组为39.8%,颗粒料组为11.8%。在试验过程中,干物质采食量(DMI)、饮水量、瘤胃反刍时间、瘤胃温度和pH情况均记录。3周后收集粪样,确定潜在的可消化NDF总消化率(pdNDF)。每阶段结束后计算平均日增重和饲料转化率。颗粒料组的DMI、DMI/体重和饮水量更高。而两组间平均日增重和饲料转化率无显著差异。颗粒料组的瘤胃反刍时间为241 min·d-1低于TMR组的507 min·d-1。饲料的不同物理外形对瘤胃温度、瘤胃pH无显著影响。TMR组的pdNDF总消化率为90.25%高于颗粒料组的86.82%。试验结果表明,动物易接受完整的颗粒饲料,DMI较高,且反刍时间减少,但瘤胃pH无显著变化。TMR组的pdNDF消化率显著增加。尽管两组奶牛在DMI和纤维消化方面表现不同,但总体表现相似,两组饲料的保存时间与其物理形式有关。在短期内,提供能满足NDF需求的完全颗粒饲料可改善瘤胃健康状况和动物生产性能,而较长时间的数据则需要进一步试验。 | Wang J Yang M Cao M Lin Y Che L Q Duraipandiyan V Al-Dhabi N A Fang Z F Xu S Y Feng B Liu G Wu D Bonfante E Palmonari A Mammi L Canestrari G Fustini M Formigoni A | 2016 | 饲料博览2016，0，12： | 2 |
| 4 | 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 |
| 5 | DEA models for supply chain efficiency evaluation显示文摘 | Liang L Feng Y Cook W D Zhu J | 2006 | Annals of Operations Research2006，145，1： | 1 |
| 6 | Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores 显示文摘 | Zhao D Y Feng J L Huo Q S | 1998 | Science1998，279，： | 1 |
| 7 | Moving element method for train-track dynamics显示文摘 | Koh C G Ong J S Y Chua D K H Feng J | 2003 | International Journal for Numerical Methods in Engineering2003，56，： | 1 |
| 8 | Global entropy solutions to the relativistic Euler equations for a class of large initial data显示文摘 | LI Y C FENG D M WANG Z J | 2005 | Zeitschrift für angewandte Mathematik und Physik2005，56，2： | 1 |
| 9 | Liposonmal oral DNA vaccine(mycobacterium DNA) elicits immune response显示文摘 | Wang D Xu J Feng Y H | 2010 | Vaccine2010，28，18： | 1 |
| 10 | Nonionic triblock and star diblock copolymer and oligomeric surfactant syntheses of highly ordered, hydrothermally stable, mesoporous silica structures显示文摘 | Zhao D Huo Q Feng J | 1998 | Journal of the American Chemical Society1998，120，： | 1 |
| 11 | Blood flow and leukocyte mobilization in infection:A comparison between ischemic and wellperfused flaps显示文摘 | Feng L J Price DC Hohn D | 1983 | Plast Surg Forum1983，86，： | 1 |
| 12 | Mechanistic studies of electrodeposition for bioceramic coatings of calcium phosphates by an in situ pH-microsensor technique显示文摘 | Zhang J M Lin C J Feng Z D | 1998 | Journal of Electroanalytical Chemistry1998，452，2： | 1 |
| 13 | Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores显示文摘 | ZHAO D FENG J HUO Q MELOSH N FREDRICKSON G H CHMELKA B F STUCKY G D | 1998 | Science1998，279，5350： | 1 |
| 14 | Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50 to 300 Angstrom Pores显示文摘 | Zhao D Y Feng J L Huo Q S | 1998 | Science1998，279，： | 1 |
| 15 | Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores 显示文摘 | Zhao D Feng Y J Huo Q | 1998 | Science1998，279，5350： | 1 |
| 16 | A Locally Adaptive Filter of Interferometric Phase Images显示文摘 | Wu N Feng D Z Li J | 2006 | Geoscience and Remote Sensing Letters IEEE2006，3，： | 1 |
| 17 | Rotational micro-motion modulated jamming for countering ISAR based on intermittent sampling repeater显示文摘 | Pan X Y Wang W Feng D J | 2013 | Progress in Electromagnetics Research2013，36，： | 1 |
| 18 | Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstorm pores 显示文摘 | Zhao D Y Feng J L Huo Q S | 1998 | Science1998，279，5350： | 1 |
| 19 | CD86 + 1057G/A polymor- phism and susceptibility to Ewing's sarcoma: a case-control study 显示文摘 | Wang J Zhou Y Feng D | 2012 | DNA Cell Biol2012，31，4： | 1 |
| 20 | Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores显示文摘 | Zhao D Y Feng J L Huo Q S | 1998 | Science1998，279，23： | 1 |
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