The palaeomagnetism of some Precambrian rocks from the Itivdleq region of West Greenland

Imperial Users onl

Electrode carrying wire for GTAW welding

A welding torch for gas tungsten arc welding apparatus has a hollow tungsten electrode including a ceramic liner and forms the filler metal wire guide. The wire is fed through the tungsten electrode thereby reducing the size of the torch to eliminate clearance problems which exist with external wire guides. Since the wire is preheated from the tungsten more wire may be fed into the weld puddle, and the wire will not oxidize because it is always within the shielding gas

Internal wire guide for GTAW welding

A welding torch for gas tungsten arc welding apparatus has a filler metal wire guide positioned within the torch, and within the shielding gas nozzle. The wire guide is adjacent to the tungsten electrode and has a ceramic liner through which the wire is fed. This reduces the size of the torch and eliminates the outside clearance problems that exit with external wire guides. Additionally, since the wire is always within the shielding gas, oxidizing of the wire is eliminated

Gerald D. Morgan to Senator James O. Eastland, 22 October 1954

Typed letter signed dated 22 October 1954 from Gerald D. Morgan, Administrative Assistant to the President, to Eastland, re: receipt of 18 October letter. Attached: carbon typed letter dated 18 October 1954 from Eastland to Eisenhower, re: rice allotments and marketing quotas, Korean conflict, cotton; 2 pages. Attached: draft of above letter; 4 pages.https://egrove.olemiss.edu/joecorr_c/1008/thumbnail.jp

The Use of Concept Formation Study Guides for Social Studies Reading Materials

No abstract available

Application of the Interfoam VoF Code to Coastal Wave/Structure Interaction

The validation of the “interFoam” CFD model (part of the OpenFOAM) CFD library is described for a number of wave/structure interaction problems. The background to the research is described, including the reasons for the selection of a new, previously unvalidated CFD code for this purpose. The numerical aspects of the code are briefly reviewed as are some of its additional features including the simulation of porous media. The new wave-generating boundary condition, created as part of this project, is described. The model is validated for the propagation of waves, including violent, breaking waves, using the widely-known “Dingemans” test case as well as new data for wave and focussed wave group propagation over a bar. The model is validated for wave interaction with surface-piercing structures by examining a test case for focussed wave-group impact on a surface-piercing cylinder with one near-breaking wave and a second, breaking, wave. The model is shown to perform well in these cases without the need for calibration and can therefore be considered to be a valuable design tool. It is also shown that in these cases the model can run sufficiently fast to be practical and economic for use as a design tool. The model is validated for porous media with a case examining porepressure transmission through a porous breakwater. The model performs poorly without calibration, highlighting the high levels of uncertainty in the Darcy parameter, but once calibrated is found to produce accurate results in very reasonable time. A case study of a porous roundhead defence structure is also presented to further reinforce the practical usefulness of the model in design.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Advanced propfan analysis for the family of commuter airplanes

Advanced propfans were selected to be used throughout the family of commuters. These propulsion systems offer a 25 to 28 percent fuel savings over comparably sized turbofans operating in the 1990s. A brief study of the propulsion systems available for the family of commuters is provided and the selection of the advanced turboprops justified. The propeller and engine designs and performance are discussed. The integration of these designs are examined. Also addressed is the noise considerations and constraints due to propfan installation

Study of Flow Over Weirs such as Pulteney Weir

Experimental and Computational Hydraulic