Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Keyword
-
- 61.70 (1)
- 78.70 (1)
- Bolted joints (1)
- Conductivity (1)
- Crystalline solids (1)
-
- Excitons (1)
- Ferrites (1)
- Hydroelectric power plants (1)
- Hydrophone (1)
- Instruments (1)
- Linewidths (1)
- Liquid structure (1)
- Magnetite (1)
- Nickel (1)
- Saint John River Watershed (ME) (1)
- Tubular steel structures (1)
- Underwater acoustics (1)
- Vibration resonance (1)
- Water resources development project (1)
- Publication
- Publication Type
Articles 1 - 15 of 15
Full-Text Articles in Engineering
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Materials Science and Engineering Faculty Research & Creative Works
Organic additives are used extensively in zinc electrowinning to assist in controlling the process. A cyclic voltammetry technique has been developed to provide a rapid, quantitative evaluation of the effectiveness of selected organic additives in minimizing the deleterious effects that impurities, such as antimony, have on zinc deposition. Results have indicated that animal glues are more effective than the other organic additives tested, which included several gums, enzymes, and amino acids, in relation to the current efficiency of zinc production. Of the various animal glues compared in this research, the most effective appeared to have average molecular weights in the …
Assessment Of Feasibility Of Proposed Bolted Connections For Tubular Structures, John Henry Tausch
Assessment Of Feasibility Of Proposed Bolted Connections For Tubular Structures, John Henry Tausch
Dissertations and Theses
The search for new and additional sources of energy -- from sun, wind, waves, and ocean currents -- is necessitating the development of structures in the open environment of the oceans as well as on land. The advantages of round or tubular members for use in such structures are shown; and to avoid the uncertainties of welded joints, two bolted connections are proposed and their feasibility explored.
Dense Chromium Sesquioxide, P. D. Ownby
Dense Chromium Sesquioxide, P. D. Ownby
Materials Science and Engineering Faculty Research & Creative Works
A sintered, fine grained, polycrystalline, essentially fully dense, essentially single phase Cr2O3 body is prepared by sintering Chromium Sesquioxide (Cr2O3) at essentially the equilibrium oxygen partial pressure (PO2) for the formation of CrO 3 from its elements at the sintering temperature. To achieve optimum theoretical density a second metal oxide dopant such as MgO, capable of controlling the grain size, is added. In addition, Cr2O3 bodies are rendered more stable, and thus have a longer life, by maintaining over the body an atmosphere which is essentially equilibrium Po, …
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Evaluation Of Organic Additives For Use In Zinc Electrowinning, R. C. Kerby, H. E. Jackson, Thomas J. O'Keefe, Yar Ming Wang
Materials Science and Engineering Faculty Research & Creative Works
Organic additives are used extensively in zinc electrowinning to assist in controlling the process. A cyclic voltammetry technique has been developed to provide a rapid, quantitative evaluation of the effectiveness of selected organic additives in minimizing the deleterious effects that impurities, such as antimony, have on zinc deposition. Results have indicated that animal glues are more effective than the other organic additives tested, which included several gums, enzymes, and amino acids, in relation to the current efficiency of zinc production. Of the various animal glues compared in this research, the most effective appeared to have average molecular weights in the …
19th Annual Conference On Analytical Chemistry
19th Annual Conference On Analytical Chemistry
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 19th annual meeting of the Conference on Analytical Chemistry, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 1-3, 1977.
Vibrational Excitons, Resonant Energy Transfer, And Local Structure In Liquid Benzene, Richard Alan Lesar, R. Kopelman
Vibrational Excitons, Resonant Energy Transfer, And Local Structure In Liquid Benzene, Richard Alan Lesar, R. Kopelman
Richard Alan Lesar
The presence of vibrational excitons in liquid benzene has been tested by the method of isotopic dilution. A C6H6/C6D6 concentration study on the infrared and Raman fundamental modes reveals that the umbrella (A 2u ) vibrational exciton in solid benzene retains its characteristics upon melting and at room temperature. The total liquidexciton bandwidth is about 40 cm−1, practically the same as in the solid. This indicates an instantaneous local liquid structure similar to that of the solid (the C i crystal site symmetry is also nearly preserved), in general agreement with indications from other methods. The fastest nearest neighbor vibrational …
D. C. Conductivity Of Magnetite And Nickel Ferrites, Nazeih M Botrous El Badramany
D. C. Conductivity Of Magnetite And Nickel Ferrites, Nazeih M Botrous El Badramany
Archived Theses and Dissertations
No abstract provided.
Positron Lifetime As A Function Of Grain Size, Hollis P. Leighly
Positron Lifetime As A Function Of Grain Size, Hollis P. Leighly
Materials Science and Engineering Faculty Research & Creative Works
Published data on positron annihilation lifetime in copper as a function of grain size have been analyzed to show that there is a linear relationship between the internal grain boundary surface area, per unit volume, S v, and the positron lifetime, τ. The analysis indicates that grain boundaries are important in the trapping of positrons. It is suggested that the slope of the resulting straight line, dS v/dτ, can be used to determine the annihilation rate of the grain boundaries. © 1977 Springer-Verlag.
Dickey-Lincoln School Lakes, Maine, U.S.A. And Quebec, Canada: Design Memorandum No. 4a: General Design (Revised), New England Division, United States Corps Of Engineers
Dickey-Lincoln School Lakes, Maine, U.S.A. And Quebec, Canada: Design Memorandum No. 4a: General Design (Revised), New England Division, United States Corps Of Engineers
Dickey-Lincoln School Lakes Project
This design memorandum presents for review the revised general plan and data for the Dickey-Lincoln School Lakes project, Maine, U.S.A. and Quebec, Canada to provide the basis for preparation of detailed design memoranda, plans and specifications. This document presents revisions to the basic project plan and related data included in the 1967 General Design Memorandum reflecting current water resource requirements. This memorandum serves as a functional design document and 1s presented 1n Phase II level of detail. However, 1n view of the long period of Inactivity, Phase I features have also been incorporated for continuity of project information.
Low Order Correction For Subsurface Contributions In Diffusion Experiments, D. Powers, Manfred Wuttig
Low Order Correction For Subsurface Contributions In Diffusion Experiments, D. Powers, Manfred Wuttig
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Glass In The Year 2000, Norbert J. Kreidl
Glass In The Year 2000, Norbert J. Kreidl
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Subsolidus Equilibria And Stabilization Of Tetragonal Zro2 In The System Zro2‐Al2o3‐Sio2, Charles A. Sorrell
Subsolidus Equilibria And Stabilization Of Tetragonal Zro2 In The System Zro2‐Al2o3‐Sio2, Charles A. Sorrell
Materials Science and Engineering Faculty Research & Creative Works
The irreversible reaction between zircon and alumina to form mullite and zirconia was observed to proceed very slowly at 1480°C, confirming the existence of a stable join between mullite and zirconia in addition to the join between mullite and zircon. Attempts to determine equilibrium assemblages in powder samples of several combinations of the constituents at 1300° and 1400°C were unsuccessful. Metastable tetragonal ZrO2 was observed in fired powder samples containing kaolinite, in fired zircon‐alumina samples, and in calcined gels prepared from zirconyl nitrate, aluminum nitrate, and colloidal silica in water. Tetragonal ZrO2 was the dominant crystalline phase in …
Suggested Chemistry Of Zinc Oxychloride Cements, Charles A. Sorrell
Suggested Chemistry Of Zinc Oxychloride Cements, Charles A. Sorrell
Materials Science and Engineering Faculty Research & Creative Works
Solutions of ZnCl2 were prepared from ZnCl2·nH2O and by reaction of zinc metal with HCl. Specific gravities and pH values were determined as a function of composition. A ternary phase, 4ZnO·ZnCl2·5H2O, was precipitated when the ZnCl2 solutions were diluted to a pH of 5.48 ± 0.05. Mixtures of ZnO with ZnCl, and HCI solutions were equilibrated in sealed containers and analyzed by X‐ray diffraction. The resulting phase diagram shows 2 ternary phases, 4ZnO·ZnCl2·5H2O (4·1·5) and ZnO·ZnCl2·2H2O (1.1.2), both of which are soluble …
A Laser Hydrophone, Steven Kenneth Barnoske
A Laser Hydrophone, Steven Kenneth Barnoske
Retrospective Theses and Dissertations
This report proposes a novel technique for measuring of acoustic fields in water. A Laser Hydrophone is proposed taking advantage of the properties of Total Internal Reflection. A theoretical analysis of the idea is presented followed by a prediction of the operating characteristics of an actual system. Actual data were taken with the proposed system and it is compared to the predicted.
The Al2o3‐Sio2‐Zro2 Liquidus Surface: A Discussion, Charles A. Sorrell
The Al2o3‐Sio2‐Zro2 Liquidus Surface: A Discussion, Charles A. Sorrell
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.