4,129 research outputs found
Correspondence to Mary Ann Smith From William H. Borders and C.M. Lowe, March 22, 1961
No full textCorrespondence from William H. Borders and C.M. Lowe to Mary Ann Smith notifying her of a meeting for the Atlanta Student Adult Liaison. 1 page
Three-component velocity measurements in a momentum-conserving, axisymmetric, turbulent jet
No full textExperiments have been performed on a momentum conserving axisymmetric turbulent jet, the turbulence characteristics of which are well known [1]. Simultaneous three-component velocity measurements are acquired with high spatial and temporal resolution, using a new triple-sensor hotwire probe. Velocity and directional calibrations are performed using a dedicated automatic calibration system. Two experiments are performed; one for capturing the average velocity field in a 3D volume, and one for investigating the turbulence spectra in specific points in space. In the first experiment, measurements are performed in 9 equidistant cross-planes, from 10- to 50-diameters downstream of the nozzle using a computer-controlled traversing system. The spatial resolution is as low as 1 mm and the sampling rate was 10 kHz. In the second experiment, long velocity time histories are acquired with 50 kHz sampling rate to perform power spectral density computations for each velocity component. Preliminary results of velocity capture confirm the general characteristics of the turbulent jet. The power spectra at different positions indicate that the turbulent fluctuations are not isotropic at lower frequencies
A General History of the Congregation of the Mission Beginning after the Death of Blessed Vincent de Paul
Get PDFThis work is the earliest known history of the Congregation of the Mission and dates from about 1730. Vincentian historian John E. Rybolt, C.M., building on the initiative of Stafford Poole, C.M., completed this English translation from the original French. The author, Claude-Joseph Lacour, C.M. (1672-1731), drew from already published materials and his own recollections. While the story he tells may seem familiar, Lacour included materials that are unknown anywhere else and delivers a first-hand account of the Congregation’s rapid growth in those early days. The text is essential reading for anyone wishing to better understand Vincent de Paul’s society of apostolic life of priests and brothers following his death.https://via.library.depaul.edu/vincentian_ebooks/1044/thumbnail.jp
Turbulent separation in lower curved wall channels
No full textTurbulent boundary layer separation in channels with a lower curved wall is studied using direct numerical simulations (DNS). Turbulence dynamics are studied through classical statistical tools such as the turbulent kinetic energy budget for varying lower curved wall dimensions. The geometry features are expected to have a significant effect on the fluid flow structures and the characteristic scales of separation. The separation bubble behind the bump is studied in terms of its size, turbulent kinetic energy production mechanisms and transfer and scale-by-scale energy budget. New innovative data-analysis techniques will be used based on the generalisation of the Kolmogorov equation to anisotropic and spatially non-homogeneous flow configurations
The Effects Of Vacuum Induction Melting And Electron Beam Melting Techniques On The Purity Of Niti Shape Memory Alloys
No full textThe usual process to produce NiTi shape memory alloys is by vacuum induction melting (VIM) using graphite crucible that contaminates the bath with carbon. The contamination by oxygen comes from residual oxygen inside the melting chamber. A new alternative process to produce NiTi alloys is by electron beam melting (EBM) using water-cooled copper crucible that eliminates the carbon contamination and the oxygen contamination would be minimized due to operation in high vacuum. This work compares the two processes and shows that the carbon contamination is four to ten times lower for EBM compared to VIM products and that the final oxygen content is much more dependent on the starting raw materials. The purity of the final product should be very important mainly in terms of biomedical applications and the contaminations by carbon and oxygen affect the direct and reverse martensitic transformation temperatures. © 2006 Elsevier B.V. All rights reserved.438-440SPEC. ISS.679682Jackson, C.M., Wagner, H.J., Wasilewski, R.J., (1972) NASA-SP, 5110Otubo, J., Mei, P.R., Koshimizu, S., Martinez, L.G., (1998) The Third Pacific Rim International Conference on Advanced Materials and Processing-PRICM-3, vol. 1, pp. 1063-1068. , Imam M.A., DeNale R., Hanada S., Zhong Z., and Lee D.N. (Eds). Honolulu, Hawaii, USA, 12-16 July, The Minerals, Metals & Materials Society, TMSOtubo, J., Rigo, O.D., Moura Neto, C., Kaufman, M.J., Mei, P.R., (2003) J. Phys. IV Fr., 112, pp. 873-876Otubo, J., Rigo, O.D., Moura Neto, C., Kaufman, M.J., Mei, P.R., (2004) Mater. Res., 7 (2), pp. 263-267Choudhury, A., (1992) ISIJ Int., 32, pp. 554-563Nakayama, T., Kuroda, A., Kurita, K., (1992) ISIJ Int., 32, pp. 583-592Watanabe, S., Suzuki, K., Nishikawa, K., (1992) ISIJ Int., 32, pp. 625-629Lalinyuk, A.N., Trigub, N.P., Zamkov, V.N., Ivasishin, O.M., Markovsky, P.E., Teliovich, R.V., Semiatin, S.L., (2003) Mater. Sci. Eng., A346, pp. 178-188Mitchell, A., (1992) ISIJ Int., 32, pp. 557-562Matsumoto, H., (1991) J. Mater. Sci. Lett., 10, pp. 417-419Matsumoto, H., (1991) J. Mater. Sci. Lett., 10, pp. 596-59
Turbulence modulation in particle laden homogeneous shear flow: Exact Regularized Point Particle method
No full textThis contribution presents a first evaluation of a new approach, dubbed the Exact Regularized Point Particle (ERPP) method [Gualtieri et al., Exact regularized point particle method for multi-phase flows in the two-way coupling regime, arXiv preprint arXiv:1405.6969], designed to model the modulation of turbulence by hundred thousands of small inertial particles. The approach overcomes some intrinsic difficulties which arise in some circumstances in available approaches like, e.g., the Particle In Cell (PIC) method introduced by Crowe and coworkers since 1977. Numerical results concerning a homogeneous shear flow at moderate values of the Reynolds number laden with hundred thousand of small inertial particles are discussed documenting the turbulence modification in the so-called two-way coupling regime, in a range of control parameters unaccessible to the available approaches
Niti Sma Production Using Ceramic Filter During Pouring The Melt
No full textThe usual process to produce NiTi shape memory alloys (SMA) is by vacuum induction melting (VIM) using graphite crucibles which contaminate the bath with carbon. Carbon reacts with titanium precipitating TiC influencing the matrix composition which, in turn, affects the martensitic transformation temperatures. Furthermore, the presence of TiC makes the final product difficult for mechanically process using cold working steps. In this study, we present preliminary results of our attempt to remove the TiC from the melt using ceramic filters during pouring and analyzed the efficiency of the filtering process and some results will be presented. © 2005 Elsevier B.V. All rights reserved.162-163SPEC. ISS.116120Jackson, C.M., Wagner, H.J., Wasilewski, R.J., (1972) NASA-SP, 5110Koshimizu, S., Yamamoto, S., (1992) Proceedings of 10th CBECIMAT, pp. 449-451Koshimizu, S., Yamamoto, C.S., (1993) REM: Revista Escola de Minas, Ouro Preto, 46 (13), pp. 40-47Andrade, M.S., (1985) Final Project Report, p. 146. , Fundação Centro Tecnológico de Minas Gerais, B.HAndrade, M.S., Silva, J.E., Lara, M.H.S., (1988) Anais do 8 CBECIMAT, pp. 256-259. , UNICAMP, Campinas, S.POtubo, J., Mei, P.R., Koshimizu, S., Martinez, L.G., (1998) The Third Pacific Rim International Conference on Advanced Materials and Processing-PRICM-3, 1, pp. 1063-1068. , M.A. Imam, R. DeNale, S. Hanada, Z. Zhong, D.N. Lee (Eds.) 12-16 July Honolulu, Hawaii, USA The Minerals, Metals and Materials Society, TMSOtubo, J., Rigo, O.D., Moura Neto, C., Kaufman, M.J., Mei, P.R., Scale up of NiTi shape memory alloy production by EBM (2003) J. Physique, IV France, 112, pp. 873-876Otubo, J., Rigo, O.D., Moura Neto, C., Kaufman, M.J., Mei, P.R., Low carbon content shape memory alloy produced by electron beam melting (2004) Mater. Res., 7 (2), pp. 263-267Sutton, W.H., Morris, J.R., (1983) 31st Annual Meeting of the Investment Casting Industry, pp. 901-921. , Dallas, TX, 3-5 OctoberApelian, D., Sutton, W.H., (1984) Fifth International Symposium on Superalloys, pp. 421-432. , 7-11 October Seven Springs, PAJones, S.C., (1989) Proceeding Conference Scaninject V Part 2, pp. 553-572. , 6-8 June Lulea, Swede
The great household in late medieval England
No full textIn the later medieval centuries, a whole range of important social, political, and artistic activities took place against the backdrop of the great English households. In this lively book, C. M. Woolgar explores the fascinating details of life in a great house. Based on extensive investigation of household accounts and related primary documents, Woolgar vividly illuminates the operations of great households. He also delineates the major changes that transformed the economy and geography of both lay and clerical households between 1200 and 1500.In this portrait of aristocratic and gentry life in medieval England, Woolgar describes the roles of family members, the situations of servants, the uses of space within the household, food and drink for daily consumption and for special occasions, furnishing, clothing, arrangements for travel, household animals, cleanliness and hygiene, entertainment, the practices of religion, and intellectual life. The author also analyzes the qualitative and social evolution of great households as definitions of magnificence and conventions of etiquette became increasingly elaborate
Turbulence modulation in particle laden pipe flow: Exact regularized point particle method
No full textMany technological applications are characterized by turbulent bounded flows with dispersed particles. For high mass load (particle/fluid mass ratio) a significant inter-phase momentum exchange occurs (two-way coupling regime), inducing a significant alteration of the turbulent field which, in turn, modifies the dynamics of the suspended phase. Aim of the present study is exploring the potentially of recently developed momentum coupling method, dubbed the Exact Regularized Point Particle (ERPP) method, in reproducing via Direct Numerical Simulation (DNS) the detailed dynamics of a particles laden turbulent pipe flow. The comparison with available experimental and numerical data confirms the ability of the new approach in reproducing the relevant dynamics also in parameter ranges which are unaccessible to standard techniques
Experiments and DNS of a round jet with turbulent inlet
No full textExperimental and Direct Numerical Simulation data of a turbulent round jet fed by a turbulent pipe are compared in the near field. The Reynolds number achieved in both the experiment and the simulation, Re = 16000, allows a direct comparison of both the average and the fluctuating velocity statistics. In the experiments the jet is fed with olive oil droplets with a Stokes number St ' 1 whose dynamics is compared against the corresponding DNS simulation to asses the ability of particles to reproduce high order turbulence statistics and to asses the accumulation properties of inertial particles in the near field
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