Design reliability goal developed from small sample

Sampling distributions, constructed by Monte Carlo simulation are used in hardware development to establish a design reliability goal, to place a confidence coefficient on reliability estimates, and to determine whether sample stress/strength data demonstrate a specified reliability at a specified confidence level

Cavitation erosion of materials

Bilbiography: p. 141-148.This investigation was undertaken to find the optimum hydraulic fluids and materials for combating cavitation erosion in hydraulic mining machinery operating,on 5:95 oil-in-water emulsions, Controlled cavitation was generated in the laboratory in a vibratory cavitation apparatus employing the stationery specimen system. The influence of separation distance between the drill tip and specimen and of varying medium temperature on cavitation erosion were also investigated but were of secondary importance to the studies on materials and emulsions, The evaluation of the influence of a number of commercial metal cutting coolants and specific hydraulic emulsions oncavitation erosion,showed that those emulsions with a high mineral oil content suppress erosion the most, This phenomenon is considered to be either the result of a reduction in nucleation of highly damaging surface cavities due to the elimination of surface nuclei by an oil film, or to damping of cavity collapse due to the high dissolved gas content of oil-in-water emulsions, A large number of commercial grade alloys and polymers have been investigated, The alloys ranged from single phase, face centered cubic nickel alloys to complex, multi-phase, cobalt based alloys while the polymeric materials were all linear and crystalline. The modes of erosion and mechanisms of erosion resistance were studied in detail by optical microscopy, scanning and transmission electron microscopy and X-ray diffractometry. The fractographic studies on the alloys revealed, in particular, the role played by second phase particles and other surface features such as protruding grain boundaries and surface steps created by dislocation movement, twinning and phase transformations, Furthermore, X-ray diffractometry coupled with theoretical considerations and the findings of previous investigations indicated the fundamental importance of phase transitions in contributing towards the erosion resistance of alloys, Cobalt based Stellite alloys, nickel based cemented carbides and the intermetallic alloy NiTi have exceptionally high erosion resistance, The Stellites have a high yield stress and also undergo an awe phase transition which results in a high work hardening rate and high strain to fracture, NiTi similarly undergoes a phase transformation which allows absorption of seven per cent reversible strain and also results in a high work hardening rate. The erosion resistance of nickel based tungsten carbides is, in turn, attributable to the very high yield stress of these materials, Ultra high molecular weight polyethylene and nylons have relatively high erosion resistances, Their exceptional performances are due to a high strain to fracture and high yield strength respectively. On the other hand low tensile strength polytetrafluoroethylene has a very poor resistance to erosion. This work has identified various material properties which are required for erosion resistance, These are : (a) a high yield stress, (b) a high work hardening rate and (c) a high strain to fracture

The Dynamic Duo--Librarian and English Instructor--Team Up to Ensure a Successful Research Paper

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A Midsummer Night\u27s Dream

Alpha Psi Omega presented an abridged production of William Shakespeare\u27s A Midsummer Night\u27s Dream, produced by the JSU Department of Theatre and Film and The Shakespeare Project. (April 2021) Directed by: Dr. Michael Boynton and Gregory Heathcock Scenic Design: Jessica Collier Costume Design: Eleanor Boozer Dramaturgs: Rebecca Weaver and Carmine Di Biase Stage Manager: Cheyenne Oliver Assistant Stage Manager: Grayson Singleton CAST Theseus/Oberon: Michael Boynton Hippolyta/Titania: Carolyn Conover Puck/Egeus/Philostrate: Kenli Doss Quince/Fairy/Cobweb/Peaseblossom/Mustardseed: Bridgett Rayburn Lysander/Bottom: Trey Gresham Demetrius/Flute: Trevor McWilliams Helena/Snug: Carley Carey Hermia/Snout: Keeley Tibbittshttps://digitalcommons.jsu.edu/shakespeare_proj/1015/thumbnail.jp

Checking Out Facebook.com: The Impact of a Digital Trend on Academic Libraries

While the burgeoning trend in online social networks has gained much attention from the media, few studies in library science have yet to address the topic in depth. This article reports on a survey of 126 academic librarians concerning their perspectives toward Facebook.com, an online network for students. Findings suggest that librarians are overwhelmingly aware of the ‘Facebook phenomenon.’ Those who are most enthusiastic about the potential of online social networking suggested ideas for using Facebook to promote library services and events. Few individuals reported problems or distractions as a result of patrons accessing Facebook in the library. When problems have arisen, strict regulation of access to the site seems unfavorable. While some librarians were excited about the possibilities of Facebook, the majority surveyed appeared to consider Facebook outside the purview of professional librarianship

Public health and economic costs of investigating a suspected outbreak of Legionnaires' disease.

This paper provides one of the first assessments of the burden of both the public health investigation and the economic costs associated with an apparent outbreak of Legionnaires' disease (LD) in South East London. In addition to epidemiological, microbiological and environmental investigations, we collected data on the staff time and resources committed by the 11 main organizations responsible for managing the outbreak. Of the overall estimated costs of 455,856 pounds, only 14% (64,264 pounds) was spent on investigation and control of the outbreak compared with 86% (391,592 pounds) spent on the hospital treatment of the patients. The time and money spent on public health services in this investigation appear to represent good value for money considering the potential costs of a major outbreak, including the high case-fatality rate in LD generally and the high health-care costs. Further research is needed to determine optimum strategies for the cost-effective use of health system resources in investigations of LD. Whether the threshold for investigation of cases should be based on observed incidence rates or the cost-effectiveness of investigations, or both, should be debated further

In situ generation of Mes2Mg as a non-nucleophilic carbon-centred base reagent for the efficient one-pot conversion of ketones to silyl enol ethers

Treatment of commercially available MesMgBr with 1,4-dioxane produces the key Mes2Mg reagent in situ which then mediates the deprotonation of ketones to deliver trimethylsilyl enol ethers, at readily accessible temperatures and without any nucleophilic addition, in an expedient and high yielding one-pot process

Characterisation of Milk Proteins in Confectionery Products

The proteins from milk play an important part in the structural properties of confectionery products. These properties will in turn influence texture and flavour. Electron microscopy techniques have been used to examine milk chocolate, caramel and fudge and to locate and characterise the milk proteins within their structures. Following scanning electron microscopy examination of the products at low temperature, thin sectioning and freeze-fracture were used to resolve the fine ultrastructure of casein and whey proteins. A chocolate prepared from milk crumb could be distinguished from one made with a dry milk powder on the basis of a more even distribution of protein and a high level of association between milk protein and other ingredients. Caramel was seen to be composed of an amorphous sugar support matrix containing numerous fat globules. Milk protein was found frequently associated with fat although the level of association depended on whether casein or whey protein was present. The development of crystal line sugar in fudge caused the milk protein to concentrate within the remaining amorphous sugar regions. Fat/protein associations were not as obvious as those observed in caramel

The Structure of Fresh Desiccated Coconut

Light and electron microscopy have been used to study the structure of fresh coconut endosperm tissue and the changes which have occurred when this has been processed to the desiccated form. In fresh tissue, a marked gradation of cell size , shape and contents exists between inner and outer endosperm regions. Adjacent to the brown testa, cells are rigid, compact and lipid-filled while those cells lining the central water-filled cavity have thin, easily deformed cell walls and contain little lipid . Desiccated coconut be ing derived from fresh tissue, is similar in morphology but moisture is reduced from 50% to 2- 3%. During the cutting and disintegration stages of the process, a fatty rind develops around individual particles and tissue damage may occur. A comparison has been made of a range of desiccated coconut samples from Sri Lanka and the Philippines. Variation in structural characteristics appears to correlate with known differences in processing that exist between the two countries. Significant factors relate to particle size, shape, colour and tissue damage . In the subsequent manufacture of products, such factors could clearly lead to differences in processing behaviour such that for a given recipe, products may be formed which vary in both texture and taste