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| 1 | A statistical model for porous structure of rocks显示文摘The geometric features and the distribution properties of pores in rocks were in- vestigated by means of CT scanning tests of sandstones. The centroidal coordi- nates of pores, the statistic characterristics of pore distance, quantity, size and their probability density functions were formulated in this paper. The Monte Carlo method and the random number generating algorithm were employed to generate two series of random numbers with the desired statistic characteristics and prob- ability density functions upon which the random distribution of pore position, dis- tance and quantity were determined. A three-dimensional porous structural model of sandstone was constructed based on the FLAC3D program and the information of the pore position and distribution that the series of random numbers defined. On the basis of modelling, the Brazil split tests of rock discs were carried out to ex- amine the stress distribution, the pattern of element failure and the inosculation of failed elements. The simulation indicated that the proposed model was consistent with the realistic porous structure of rock in terms of their statistic properties of pores and geometric similarity. The built-up model disclosed the influence of pores on the stress distribution, failure mode of material elements and the inosculation of failed elements. | JU Yang1,2, YANG YongMing1, SONG ZhenDuo3 & XU WenJing4 1 State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing 100083, China 2 Department of Mechanical and Manufacturing Engineering, The University of Calgary, 2500 University Drive NW Calgary, AB T2N 1N4, Canada 3 China National Coal Mining Equipment Co. Ltd, Beijing 100011, China 4 Department of Materials and Metallurgy, The University of Utah, Salt Lake City, Utah 84112, USA | 2008 | Science China(Technological Sciences)2008，51，11： | 21 |
| 2 | The Bedload Movement in the Changjiang Estuary显示文摘- Sandwaves in the Changjiang estuary were measured with a shallow sediment profiler and an echosounder from 1978 to 1988. The data, together with grain size and bedform of sediment indicates that the bedload movement by rolling and saltation is of great significance to sediment transport and is the principal factor responsible for sandwave and sandbody development in the estuary. The sandwaves were found well-developed, which is related to the tidal range and the velocity of ebb current. However, the further growth is restricted by strong flood current prevailing in the estuary. Because of the significant bedload, the sandbodies shift obviously and frequently, and sometimes the exchange of position occurs between the sandbodies and tidal channels. As a result, ships are regularly forced to change their navigation course. | Li Jiufa, Shi Weirong, Shen Huanting Xu Haigen and Doeke Eisma Associate Professor, Institute of Estuarine & Coastal Research (1ECR), East China Normal University, Shanghai200062 Professor, IECR, East China Normal University, Shanghai 200062 Professor, Netherlands Institute for Sea Research, P. O. Box 59 1790 AB, Den Burg, Texel, The Netherlands | 1993 | China Ocean Engineering1993，8，4： | 15 |
| 3 | Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts显示文摘The dynamic mechanical properties of reactive powder concrete subjected to compressive impacts with high strain rates ranging from 10 to 1.1×102 s-1 were investigated by means of SHPB (split-Hopkinson-pressure-bar) tests of the cylindrical specimens with five different steel fiber volumetric fractions.The properties of wave stress transmission,failure,strength,and energy consumption of RPC with varied fiber volumes and impact strain rates were analyzed.The influences of impact strain rates and fiber volumes on those properties were characterized as well.The general forms of the dynamic stress-strain relationships of RPC were modeled based on the experimental data.The investigations indicate that for the plain RPC the stress response is greater than the strain response,showing strong brittle performance.The RPC with a certain volume of fibers sustains higher strain rate impact and exhibits better deformability as compared with the plain RPC.With a constant fiber fraction,the peak compressive strength,corresponding peak strain and the residual strain of the fiber-reinforced RPC rise by varying amounts when the impact strain rate increases,with the residual strain demonstrating the greatest increment.Elevating the fiber content makes trivial contribution to improving the residual deformability of RPC when the impact strain rate is constant.The tests also show that the fiber content affects the peak compressive strength and the peak deformability of RPC in a different manner.With a constant impact strain rate and the fiber fraction less than 1.75%,the peak compressive strength rises with an increasing fiber volume.The peak compressive strength tends to decrease as the fiber volume exceeds 1.75%.The corresponding peak strain,however,incessantly rises with the increasing fiber volume.The total energy Edisp that RPC consumed during the period from the beginning of impacts to the time of residual strains elevates with the fiber volume increment as long as the fiber fraction is not larger than 2%.It turns to decrease if the fiber volume exceeds 2%.The added fibers make various contributions to enhancing the capability of RPC to consume energy at different loading stages.If the fiber fraction is not larger than 2%,the added fibers make more contribution to enhancing the energy consumption ability of RPC in the period before the peak strain than in the period after the peak strain.The impact strain rate,however,distinctively affects the total energy that RPC consumed and the energy consumed in the different loading periods.The higher the impact strain rate,the more the energy consumed in the stages and therefore the higher the dynamic impact toughness.The empirical relationships of the peak compressive strength,corresponding peak strain,residual strain,total consumed energy and the energy consumed in the varied periods with the impact strain rate and the fiber fraction are derived.Four generalized forms of the dynamic impact stress-strain responses of RPC are formulated by normalizing stresses and strains as the generalized coordinates and by taking account of the influences of impact strain rates and fiber volumetric fractions. | JU Yang1,2,LIU HongBin1,SHENG GuoHua1,3 & WANG HuiJie1 1 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete,China University of Mining and Technology,Beijing 100083,China 2 Department of Mechanical and Manufacturing Engineering,University of Calgary,2500 University Drive,AB T2N 1N4,Canada 3 School of Resources and Civil Engineering,Northeastern University,Shenyang 110004,China | 2010 | Science China(Technological Sciences)2010，53，9： | 8 |
| 4 | Prognostic assessment of 2361 patients who underwent pulmonary resection for non -small cell lung cancer,stage Ⅰ,Ⅱ,and ⅢA显示文摘 | an Rens MT de la Riviere AB and Elbers HR | 2000 | Chest2000，117，2： | 1 |
| 5 | Safe pre- vention of the primary cesarean delivery 显示文摘 | American College of Obstetricians and Gynecologists ( the College ) the Society for Maternal-Fetal Medicine Caughey AB | 2014 | Am J Obstet Gynecol2014，210，3： | 1 |
| 6 | Mutational analysis of the APC/beta-catenin/Tcf pathway in colorectal cancer显示文摘 | PJ Morin B Vogelstein and KW Kinzler | 1998 | Cancer Res1998，58，： | 1 |
| 7 | Exercise- induced stress response of amenorrheic and eumenorrheic runners显示文摘 | AB Loucks and SM Horvath | 1984 | J Clin Endocrinol Metab1984，59，： | 1 |
| 8 | Continuous and bilevel positive airway pressure in the treatment of acute cardiogenio pulmonary edema显示文摘 | Kosowsky JM Storrow AB and Carleton SC | 2000 | Am J Emerg Med2000，18，： | 1 |
| 9 | Toward meaningful learning in undergraduate medical education using concept maps in a PBL patho- physiology course显示文摘 | Rendas AB Fonseca M and Pinto PR | 2006 | Adv Physiol Educ2006，30，1： | 1 |
| 10 | Intrinsic craniofacial compensations显示文摘 | Enlow DH kuroda T and Lecois AB | 1971 | Angle Orthod1971，41，： | 1 |
| 11 | O2 and H2O are each the source of one O in NO2-produced from NH3 by Nitrosononas:15NNMR evidence显示文摘 | | 1983 | FEBS Lett1983，164，： | 1 |
| 12 | A report from the Committee on Vascular Lesions of the Council on Arte- riosclerosis, American Heart Association显示文摘 | Stary HC Chandler AB Dinsmore RE A definition of advanced types of atherosclerotic lesions and a histo- logical classification of atherosclerosis | 1995 | Circulation1995，92，5： | 1 |
| 13 | Safe prevention of the primary cesarean delivery显示文摘 | American College of Obstetricians and Gynecologists(College) Society for Maternal-Fetal Medicine Caughey AB | 2014 | Am J Obstet Gynecol2014，210，： | 1 |
| 14 | TIMP-3 promotes apoptosis显示文摘 | Baker AH Zaltsman AB George SJ Divergent effects of tissue inhibitor of metalloproteinase-1 -2 or 3 overexpression on rat vascular smooth muscle cell invasion proliferation and death in vitro | 1998 | J Clin Invest1998，101，6： | 1 |
| 15 | Differential display of eukaryotic messenger RNA by means of polymerase chain reaction显示文摘 | Liang P and Pardee AB | 1992 | Science1992，257，： | 1 |
| 16 | Intrinsic craniofacial compensations 显示文摘 | Enlow DH kuroda T and Lecois AB | 1971 | Angle Orthod1971，41，4： | 1 |
| 17 | Reliability, minimal detectable change, and normative values for tests of upper extremity function and power显示文摘 | Negrete RJ Hanney WJ Kolber MJ Davies GJ Ans- ley MK McBride AB and Overstreet AL | 2010 | J Strength Cond Res2010，24，： | 1 |
| 18 | Why Some Firms Export 显示文摘 | Bernard AB and JB Jensen | 2004 | Review of Economics and Statistics2004，86，2： | 1 |
| 19 | Clonal structure of wild pop- ulations and origins of horticultural stocks of lllicium parviflorum (Illiciaceae) 显示文摘 | Newell DL and Morris AB | 2010 | American Journal of Botany2010，97，9： | 1 |
| 20 | Myomectomy dur- ing cesarean section显示文摘 | EHIGIEGBA AE ANDE AB OJOBO SI | 2001 | Int J Gynecol Obstet2001，75，： | 1 |
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