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| 1 | PHYSICAL SIMULATION OF INTERFACIAL CONDITIONS IN HOT FORMING OF STEELS显示文摘In the last few years,substantial experimental simulation and mumerical modelling hare been carried out in IMMPETUS to characterise the interfacial heat transfer and friction conditions during hot forging and rolling of steels. Emphasis has been placed on the influence of the oxide scale which forms on the steel workpiece. In the present paper, the experimental methods used for investigating interfacial heat transfer and friction conditions are described. Theses include hot flat rolling of steel slabs and hot axi- symmetric forging of steel cylinders and rings.Temperature measurements and computations demon- strate that for similar conditions, similar conditions, the effective interfacial heat transfer coefficients (IHTC) derived for hot rolling are significantly higher than those for forging, mainly due to the contribution of scale cracking during rolling. On the basis of experimental observations and numerical analysis,physical models for interfacial heat transfer in forging and rolling have been established. In addition, hot' sandwich' rolling and hot tensile tests with finite element modelling have been carried out to evaluate the hot ductility of the oxide scale.The results indicate that the defomation, cracking and decohesion behaviour of the oxide scale depend on deformation temperature, strain and relative strengths of the scale layer and scale - steel interface.Finaly, friction results from hot ring compression tests and from hot rolling with forward/backward slip measurements are reported. | Y. H. Li M. Krzyzanowski J. H. Beynon and C. M. Sellars IMMPETUS( Institute for Microstructural and Mechanical Process Engineering: The University of Sheffield, Sheffield SI 3JD, UK) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 8 |
| 2 | Wideband Beamforming for Multipath Signals Based on Frequency Invariant Transformation显示文摘It is well known that the performance of conventional adaptive beamformers degrades severely due to the presence of coherent or correlated interferences(multipath propagation) and various techniques have been developed to improve the performance of the beamformer.However,most of the work in the past has been focused on the narrowband case.In this paper,the wideband beamforming problem in the presence of multipath signals is addressed,with a novel approach proposed by employing a pre-processing stage based on the frequency invariant beamforming(FIB) technique.In this approach,the received wideband array signals are first processed by an FIB network,and then a traditional narrowband adaptive beamformer or an appropriate instantaneous blind source separation(BSS) algorithm can be applied to the network outputs.It is shown that with the proposed structure,cancellation of the desired signal is reduced,leading to a significantly improved output signal to interference plus noise ratio(SINR). | Wei Liu Communications Research Group,Department of Electronic & Electrical Engineering,University of Sheffield,Sheffield,S1 3JD,UK | 2012 | International Journal of Automation and computing2012，9，4： | 5 |
| 3 | The sensitivity of singlestrand conformation polymorphism analysis for the detection of single base substitutions显示文摘 | Sheffield V C Beck J S Kwitek A E | 1993 | Genomics1993，16，： | 1 |
| 4 | A new technique for the culture propagation of fern gametophyte显示文摘 | Douglas G E Sheffield E | 1990 | Plant Cell Report1990，8，： | 1 |
| 5 | Affective empathy deficits in aggressive children and adolescents:A critical review显示文摘 | Lovett Sheffield | 2007 | Clinical Psychology Review2007，27，1： | 1 |
| 6 | Optically recording interferometer for velocity measurements with subnanosecond resolution 显示文摘 | Bloomquist D D Sheffield S A | 1983 | Journal of Applied Physics1983，54，4： | 1 |
| 7 | Co ngenital syphilis afterma- ternal treatment for suphilis during pregnancy 显示文摘 | Sheffield JS Sanchez PJ Morris G | 2002 | Am J Obstet Gy- necol2002，186，3： | 1 |
| 8 | Efficacy of treatment for syphilis in pregnancy显示文摘 | Alexander JM Sheffield JS Sanchez PJ | 1999 | Obstet Gynecol1999，93，1： | 1 |
| 9 | Geovolume visualization interpretatiom Color in 3D volumes显示文摘 | Sheffield T M Meyer D Lees J | 1999 | The Leading Edge1999，18，6： | 1 |
| 10 | The management of respiratory infections during pregnancy 显示文摘 | Laibl V Sheffield J | 2006 | Immunol Allergy Clin North Am2006，26，1： | 1 |
| 11 | Depression, anxiety, and the cardiovascular system: the cardiologist's perspective 显示文摘 | Sheps D S Sheffield D | 2001 | J Clin Psychiatry2001，62，8： | 1 |
| 12 | Analysis of hapten-carrier protein conjugates by nondenaturing gel electrophoresis显示文摘 | KAMPS H C CARLIN R J SHEFFIELD C | 1993 | Journal Immnological Methods1993，，164： | 1 |
| 13 | Syphilis in pregnancy 显示文摘 | Sheffield JS Wendel GD | 1999 | Clin Obstet Gvnecol1999，42，1： | 1 |
| 14 | LOXL1 Mutations Are Associated with Exfoliation Syndrome in Patients from the Midwestern United States显示文摘 | John H. Fingert Wallace L.M. Alward Young H. Kwon Kai Wang Luan M. Streb Val C. Sheffield Edwin M. Stone | 2007 | American Journal of Ophthalmology2007，，6： | 1 |
| 15 | The association of tree pollen concentration peaks and allergy medication sales in new york city:2003-2008显示文摘 | SHEFFIELD P E WEINBERGER K R ITO K | 2011 | ISRN Allergy2011，2011，53： | 1 |
| 16 | Analysis of hapten-carrier protein conjugates by nondenaturing gel electrophoresis 显示文摘 | Kamp Holtzapple C Carlin R J Sheffield C | 1993 | J Immunol Methods1993，164，2： | 1 |
| 17 | Submaximal exercise testing显示文摘 | Sheffield L T Rotman D Reeves J J | | J S C Med Ass0，，： | 1 |
| 18 | Efficacy of an accelerated hepatitis B vaccination program during pregnancy 显示文摘 | Sheffield JS Hickman A Tang J etal | 2011 | Obstet Gyneeol2011，117，5： | 1 |
| 19 | Raceand sex differences in cutaneous pain perception显示文摘 | Sheffield DP Biles PB Orom HB | | 0，，04： | 1 |
| 20 | Factors associated with delayed gastric emptying after pancreatieoduodenectomy显示文摘 | Parmar AD Sheffield KM Vargas GM | 2013 | HPB (Oxford)2013，15，10： | 1 |
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