Measured Particle Rebound Characteristics Useful for Erosion Prediction

1982 ◽  
Author(s):  
T. Wakeman ◽  
W. Tabakoff
Keyword(s):  
High Temperature ◽  
Impingement Angle ◽  
The Past ◽  
Erosion Prediction ◽  
Material Erosion ◽  
The University ◽  
Semi Empirical ◽  
Flow Devices ◽  
Measured Particle ◽  
Impingement Velocity

Extensive high temperature particle rebound testing has been continuing at the University of Cincinnati for the past three years utilizing the new high temperature material erosion facility. Particle rebound characteristics including particle angle and velocity restitution ratios are important in the prediction of particle trajectories through a turbomachine or other flow devices where particulate erosion is present and the prediction of erosion patterns is desired. This paper presents particle rebound data which has been accumulated for 160 microns particles impinging on INCO 718, Ti 6-4 and 2024 AL targets. Particle rebound characteristics are compared with important parameters such as target temperature, particle impingement velocity and particle impingement angle. In addition a semi-empirical erosion rate equation for INCO 718 material is derived.

Novae in the Magellanic Clouds

1979 ◽  
Vol 46 ◽  
pp. 96-101
Author(s):  
J.A. Graham
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
University Of Michigan ◽  
The Past ◽  
Spectroscopic Information ◽  
Objective Prism ◽  
The University ◽  
Small Cloud ◽  
Low Dispersion

During the past several years, a systematic search for novae in the Magellanic Clouds has been carried out at Cerro Tololo Inter-American Observatory. The Curtis Schmidt telescope, on loan to CTIO from the University of Michigan is used to obtain plates every two weeks during the observing season. An objective prism is used on the telescope. This provides additional low-dispersion spectroscopic information when a nova is discovered. The plates cover an area of 5°x5°. One plate is sufficient to cover the Small Magellanic Cloud and four are taken of the Large Magellanic Cloud with an overlap so that the central bar is included on each plate. The methods used in the search have been described by Graham and Araya (1971). In the CTIO survey, 8 novae have been discovered in the Large Cloud but none in the Small Cloud. The survey was not carried out in 1974 or 1976. During 1974, one nova was discovered in the Small Cloud by MacConnell and Sanduleak (1974).

Albumins as Embedding Media for Electron Microscopy

1969 ◽  
Vol 27 ◽  
pp. 422-423 ◽  
Author(s):  
J. L. Farrant ◽  
J. D. McLean
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
High Temperature ◽  
Biological Material ◽  
Globular Proteins ◽  
The Past ◽  
Antibody Staining ◽  
Thin Sectioning ◽  
Embedding Medium

For electron microscope techniques such as ferritin-labeled antibody staining it would be advantageous to have available a simple means of thin sectioning biological material without subjecting it to lipid solvents, impregnation with plastic monomers and their subsequent polymerization. With this aim in view we have re-examined the use of protein as an embedding medium. Gelatin which has been used in the past is not very satisfactory both because of its fibrous nature and the high temperature necessary to keep its solutions fluid. We have found that globular proteins such as the serum and egg albumins can be cross-linked so as to yield blocks which are suitable for ultrathin sectioning.

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

The consolidation of microscopy technology into a university research support facility: Reflections on the 1980's and projections for the 1990's at the university of iowa

1993 ◽  
Vol 51 ◽  
pp. 476-477
Author(s):  
Kenneth C. Moore
Keyword(s):  
Laser Scanning ◽  
Freeze Fracture ◽  
Freeze Substitution ◽  
Research Support ◽  
University Of Iowa ◽  
Staff Members ◽  
The Past ◽  
Research Grade ◽  
The University ◽  
Support Facility

The University of Iowa Central Electron Microscopy Research Facility(CEMRF) was established in 1981 to support all faculty, staff and students needing this technology. Initially the CEMRF was operated with one TEM, one SEM, three staff members and supported about 30 projects a year. During the past twelve years, the facility has replaced all instrumentation pre-dating 1981, and now includes 2 TEM's, 2 SEM's, 2 EDS systems, cryo-transfer specimen holders for both TEM and SEM, 2 parafin microtomes, 4 ultamicrotomes including cryoultramicrotomy, a Laser Scanning Confocal microscope, a research grade light microscope, an Ion Mill, film and print processing equipment, a rapid cryo-freezer, freeze substitution apparatus, a freeze-fracture/etching system, vacuum evaporators, sputter coaters, a plasma asher, and is currently evaluating scanning probe microscopes for acquisition. The facility presently consists of 10 staff members and supports over 150 projects annually from 44 departments in 5 Colleges and 10 industrial laboratories. One of the unique strengths of the CEMRF is that both Biomedical and Physical scientists use the facility.

The Tower Mill: An archaeological excavation of Queensland's oldest extant building

1996 ◽  
Vol 10 ◽  
pp. 1 ◽  
Author(s):  
Jay Hall ◽  
Jonathan Prangnell ◽  
Bruno David
Keyword(s):  
City Council ◽  
Archaeological Excavation ◽  
The Past ◽  
History Of ◽  
The University

The Tower Mill, Brisbane's oldest extant building, was excavated by the University of Queensland to determine for the Brisbane City Council the heritage potential of surrounding subsurface deposits.  Following the employment of GPR, excavation revealed interesting stratifications, features and artefacts.  Analysis permits an explanation for these deposits which augment an already fascinating history of the site's use over the past 170 years or so.

History Teaching in Rural Areas: The University of Venda

1996 ◽  
Vol 24 (1) ◽  
pp. 17-23
Author(s):  
Alan Kirkaldy
Keyword(s):  
Rural Areas ◽  
Whole Body ◽  
Social Forces ◽  
Historical Writing ◽  
Social Formation ◽  
History Teaching ◽  
The Past ◽  
The Social ◽  
The University

I would argue that history students should understand that the whole body of historical writing consists of interpretations of the past. They should be able to analyse a wide variety of texts and form their own opinions on a historical topic, and should be able to construct a coherent argument, using evidence to support their opinion. In doing so, they should be actively aware that their argument is no more “true” than that offered by any other historian. It is as much a product of their personal biography and the social formation in which they live as of the evidence used in its construction. Even this evidence is the product of other personal biographies and other social forces.

A Review on Stability of Inorganic Metal Halide Perovskites: Challenge and Opportunity for Stable Solar Cells

2021 ◽  
Author(s):  
Wanchun Xiang ◽  
Shengzhong Liu ◽  
Wolfgang Tress
Keyword(s):  
Solar Cells ◽  
High Temperature ◽  
Metal Halide ◽  
Inorganic Perovskite ◽  
The Past ◽  
Intrinsic Stability ◽  
Halide Perovskites

Inorganic perovskite based solar cells (PSCs) have been receiving unprecedented attention worldwide in the past several years due to their higher intrinsic stability towards high temperature and high theoretical power...

scholarly journals Hydrodynamic constraints on the energy efficiency of droplet electricity generators

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Antoine Riaud ◽  
Cui Wang ◽  
Jia Zhou ◽  
Wanghuai Xu ◽  
Zuankai Wang
Keyword(s):  
Energy Efficiency ◽  
Kinetic Energy ◽  
Total Energy ◽  
Viscous Dissipation ◽  
Shear Force ◽  
Mechanical Energy ◽  
Electric Energy ◽  
The Past ◽  
Viscous Shear ◽  
Impingement Velocity

AbstractElectric energy generation from falling droplets has seen a hundred-fold rise in efficiency over the past few years. However, even these newest devices can only extract a small portion of the droplet energy. In this paper, we theoretically investigate the contributions of hydrodynamic and electric losses in limiting the efficiency of droplet electricity generators (DEG). We restrict our analysis to cases where the droplet contacts the electrode at maximum spread, which was observed to maximize the DEG efficiency. Herein, the electro-mechanical energy conversion occurs during the recoil that immediately follows droplet impact. We then identify three limits on existing droplet electric generators: (i) the impingement velocity is limited in order to maintain the droplet integrity; (ii) much of droplet mechanical energy is squandered in overcoming viscous shear force with the substrate; (iii) insufficient electrical charge of the substrate. Of all these effects, we found that up to 83% of the total energy available was lost by viscous dissipation during spreading. Minimizing this loss by using cascaded DEG devices to reduce the droplet kinetic energy may increase future devices efficiency beyond 10%.

scholarly journals Steroid Sulphatase and Its Inhibitors: Past, Present and Future

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2852
Author(s):  
Paul A. Foster
Keyword(s):  
Good Evidence ◽  
The Past ◽  
Steroid Sulphatase ◽  
University Of Oxford ◽  
Therapeutic Value ◽  
Breast And Prostate Cancer ◽  
The University ◽  
Further Development ◽  
Hydrolysis Of

Steroid sulphatase (STS), involved in the hydrolysis of steroid sulphates, plays an important role in the formation of both active oestrogens and androgens. Since these steroids significantly impact the proliferation of both oestrogen- and androgen-dependent cancers, many research groups over the past 30 years have designed and developed STS inhibitors. One of the main contributors to this field has been Prof. Barry Potter, previously at the University of Bath and now at the University of Oxford. Upon Prof. Potter’s imminent retirement, this review takes a look back at the work on STS inhibitors and their contribution to our understanding of sulphate biology and as potential therapeutic agents in hormone-dependent disease. A number of potent STS inhibitors have now been developed, one of which, Irosustat (STX64, 667Coumate, BN83495), remains the only one to have completed phase I/II clinical trials against numerous indications (breast, prostate, endometrial). These studies have provided new insights into the origins of androgens and oestrogens in women and men. In addition to the therapeutic role of STS inhibition in breast and prostate cancer, there is now good evidence to suggest they may also provide benefits in patients with colorectal and ovarian cancer, and in treating endometriosis. To explore the potential of STS inhibitors further, a number of second- and third-generation inhibitors have been developed, together with single molecules that possess aromatase–STS inhibitory properties. The further development of potent STS inhibitors will allow their potential therapeutic value to be explored in a variety of hormone-dependent cancers and possibly other non-oncological conditions.

scholarly journals Decolonising Terrorism Journals

Societies ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 6
Author(s):  
Ilyas Mohammed
Keyword(s):  
Knowledge Production ◽  
Terrorist Attacks ◽  
The Past ◽  
Tremendous Amount ◽  
Muslim Majority ◽  
University Curricula ◽  
Amount Of Knowledge ◽  
The University ◽  
Tremendous Impact

Decolonisation of knowledge over the past few years has gained much traction among scholars and students in many countries. This situation has led to calls for the decolonisation of knowledge, academia, the university, and university curricula. That said, the knowledge production side of the terrorism industry, which sits inside academia, so far has escaped calls to decolonise. This situation is somewhat surprising because the terrorism industry has had a tremendous impact on many countries, especially Muslim majority ones. The 9/11 terrorist attacks have resulted in a tremendous amount of knowledge being produced and published on terrorism and counterterrorism. However, little is known about “who is publishing on terrorism and where they are based”. To this end, this paper adopts a decolonial approach and addresses the questions of “who is publishing on terrorism and where they are based” by analysing seven terrorism journals. It argues that most of the publications and knowledge on terrorism in the seven terrorism journals are produced by scholars with Western heritage and are based at Western institutions, which is connected to the coloniality of knowledge.

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