14,202 research outputs found
Report on failure of half-track cross plate inserts under fatigue load
No full textThis report details tests conducted for the Firestone Tire and Rubber Company from February 25th to March 3rd, 1944 at the testing laboratory of the Daniel Guggenheim Airship Institute in Akron, Ohio. Six half-track cross plate inserts were fatigue tested in a special testing jig under load
Thin plate buckling mitigation and reduction challenges for naval ships
No full textThin plate buckling or distortion on ship structures is an ongoing issue for shipbuilders. It has been identified that a significant number of factors can be put in place based on prior knowledge and good practice. Additionally, research work aimed at reducing thin plate distortion has been relatively prolific, particularly in the area of simulation modelling. However, the uptake in the research findings by industry has been relatively low. A number of these findings are discussed and their application considered. For any further reductions in thin plate distortion to be generated there is a clear need for better interaction between the research institutes and the industry
Plate tectonics /
No full textDevelopments in Geotectonics, 6: Plate Tectonics focuses on the exposition of the plate-tectonics hypothesis, as well as plate boundaries, stratification, and kinematics. The book first offers information on the rheological stratification of the mantle and kinematics of relative movements. Topics include lithosphere, asthenosphere, kinematics of finite motions, measurements of instantaneous movements, and worldwide kinematic pattern. The text then ponders on movements relative to a frame external to the plates and processes at accreting plate boundaries. Discussions focus on reference frames,Includes bibliographical references (pages 279-300).Electronic reproduction.Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.digitizedPrint version record.Front Cover; Plate Tectonics; Copyright Page; Foreword; Preface; Tabel of Contents; CHAPTER 1. Introduction; CHAPTER 2. Definition; CONSEQUENCES; LIMITATIONS; CHAPTER 3. Rheological stratification of the mantle; LITHOSPHERE; ASTHENOSPHERE; THE LITHOSPHERE AS A STRESS-GUIDE; THE DRIVING MECHANISM; CHAPTER 4. Kinematics of relative movements; INTRODUCTION; INSTANTANEOUS MOVEMENTS; KINEMATICS OF FINITE MOTIONS; MEASUREMENTS OF INSTANTANEOUS MOVEMENTS; PRESENT WORLDWIDE KINEMATIC PATTERN; MEASUREMENTS OF FINITE MOVEMENTS; CHAPTER 5. Movements relative to a frame external to the platesINTRODUCTIONREFERENCE FRAMES; ""ABSOLUTE"" MOVEMENT DETERMINATION; PALEOMAGNETIC SYNTHESIS; CHAPTER 6. Processes at accreting plate boundaries; INTRODUCTION; THE CREATION OF THE OCEANIC CRUST; CONTINENTAL RIFTS; CONTINENTAL MARGINS; CHAPTER 7. Processes at consuming plate boundaries; INTRODUCTION; SINKING PLATE MODEL; STRUCTURE OF TRENCHES AND ASSOCIATED ISLAND ARCS AND CORDILLERAS; CONSUMPTION OF CONTINENT-BEARING LITHOSPHERE; PLATE TECTONICS AND GEOLOGY; Appendix; ReferencesDevelopments in Geotectonics, 6: Plate Tectonics focuses on the exposition of the plate-tectonics hypothesis, as well as plate boundaries, stratification, and kinematics. The book first offers information on the rheological stratification of the mantle and kinematics of relative movements. Topics include lithosphere, asthenosphere, kinematics of finite motions, measurements of instantaneous movements, and worldwide kinematic pattern. The text then ponders on movements relative to a frame external to the plates and processes at accreting plate boundaries. Discussions focus on reference frames,Elsevie
Personal Papers (MS 80-0002)
No full textCredit invoice for 1/4 inch 12 x 7 picture frame glass sold to Daniel W. Kempner from the Pittsburgh Plate Glass Company
Wind Tunnel Tests on a Gill Ventilator
No full textThis report details wind tunnel tests on a "gill" ventilator. The measurements to be described were conducted in the 6.5 foot wind tunnel of the Daniel Guggenheim Airship Institute in Akron, Ohio for the Goodyear-Zeppelin Corporation. The object of the test was to determine the delivery of air through a set of gills for two geometrical configurations and under various conditions of pressure difference and velocity. The gills were mounted in a plate suspended in and parallel to the wind tunnel jet
Wind Tunnel Tests on New Goodyear-Zeppelin Rail Car Models with Symmetric Ends
No full textThis report presents the results of wind tunnel tests made on models one-twelfth scale of a proposed high-speed rail car capable of operating in either direction. The tests were conducted for the Goodyear-Zeppelin Corporation in the vertical wind tunnel of the Daniel Guggenheim Airship Institute in Akron, Ohio. Measurements of drag and pressure distribution were taken with the model headed directly into the wind. The ground effect was simulated by use of a stationary plate, on which were attached the rails, located at scale distance from the model. Tests were conducted at five wind velocities up to 113 mph
Numerical computation for parallel plate thermoacoustic heat exchangers in standing wave oscillatory flow
No full textA simplified computational method for studying the heat transfer characteristics of parallel plate thermoacoustic heat exchangers is presented. The model integrates the thermoacoustic equations of the standard linear theory into an energy balance-based numerical calculus scheme. Details of the time-averaged temperature and heat flux density distributions within a representative domain of the heat exchangers
and adjoining stack are given. The effect of operation conditions and geometrical parameters on the heat exchanger performance is investigated and main conclusions relevant for HX design are drawn as far as fin length, fin spacing, blockage ratio, gas and secondary fluid-side heat transfer coefficients are concerned. Most relevant is that
the fin length and spacing affect in conjunction the heat exchanger behaviour and have to be simultaneously optimized to minimize thermal losses localized at the HX-stack
junctions. Model predictions fit experimental data found in literature within 36% and 49% respectively at moderate and high acoustic Reynolds numbers
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Jetting, In-Nozzle Meniscus Motion and Nozzle-Plate Flooding in An Industrial Drop-on-Demand Print Head
No full textThe state of the ink film at and near the nozzles of a drop-ondemand(DoD) print head during jetting has a direct impact on
printing performance and reliability. We have developed highspeed imaging apparatus and analytical techniques to investigate
the ink film dynamics on an industrial print head nozzle-plate in real-time. In addition to a direct correlation between the jet
emergence velocity and drive voltage, drive-dependent variations in the oscillation of the ink meniscus in adjacent nozzles were also observed. Using a ray-tracing model to analyze the meniscus shape, the meniscus oscillations for both printing and nonprinting nozzles were found to be complex and involve elements such as pre-oscillation and high-order surface waves. The flooding of non-firing nozzles, deliberately caused by the application of maximum drive voltage to a neighboring nozzle, has been recorded and analyzed dynamically. The build-up of fluid in an annulus around the nozzle (flooding rate) has been characterized and compared with models for the net ink flow
through the nozzle
Plate Product Lifetimes And The Environment 2017: Conferene Proceedings
No full textEvent: Plate 2017 Conference, 08-10 November 2017, Delft, The NetherlandsCircular Product DesignMarketing and Consumer Researc
Analysis of the free vibration of a coupled plate/fluid interacting system and interpretation using sub-system modal energy
No full textThis paper describes a method for describing and quantifying the vibratory behaviour of interacting structural/fluid systems based upon reference to the relative energy associated with each of the sub-systems. The particular case selected is that of a circular plate in interaction with a cylindrical fluid cavity. A theoretical analysis is performed, based upon the Euler Bernoulli and Helmholtz equations combined through a Galerkin technique, from which the natural frequencies and associated mode functions of the interacting system are calculated. The convergence of the analysis is investigated and the opportunity is taken to investigate the sensitivity of the coupled natural frequencies to different assumed mode shapes of the plate in vacuo. Subsequently the coupled mode functions are used to describe details of the energy associated with the plate and the fluid. It is found that presentation of these relative energies renders a satisfactory insight into the vibration behaviour of the coupled system
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