Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization

The present paper gives a technical review of fracture toughness testing, evaluation and standardization for metallic materials in terms of the linear elastic fracture mechanics as well as the elastic–plastic fracture mechanics. This includes the early investigations and recent advances of fracture toughness test methods and practices developed by American Society for Testing and Materials (ASTM). The review describes the most important fracture mechanics parameters: the elastic energy release rate G, the stress intensity factor K, the Jintegral, the crack-tip opening displacement (CTOD) and the crack-tip opening angle (CTOA) from the basic concept, definition, to experimental estimation, test methods and ASTM standardizing practices. Attention is paid to guidelines on how to choose an appropriate fracture parameter to characterize fracture toughness for the material of interest, and how to measure the fracture toughness value defined either at a critical point or in a resistance curve format using laboratory specimens. The relevant ASTM fracture toughness test standards considered in this paper are E399 for KIc testing, E561 for K–R curve testing, E813 for JIc testing, E1152 for J–R curve testing, E1737 for JIc and J–R curve testing, E1290 for CTOD (δ) testing, a combined common test standard E1820 for measuring the three parameters of K, J and δ, E1921 for the transition reference temperature T0 testing and the master curve of cleavage toughness KJc testing, and E2472 for CTOA testing. The effects of loading rate, temperature and crack-tip constraint on fracture toughness as well as fracture instability analysis are also reviewed

Use of a microcomputer database system in a statewide effort for data collection in medical genetics

pre-printThe Genetics Office Automation System (GOAS) is a database management system for the collection and reporting of medical genetics data. We have previously reported on its implementation in a single university center [1,2]. We report here on its implementation in a coordinated data collection effort for the State of Missouri. We discuss the current status of the data collection activities and procedures to share data collected at an individual center with state, regional, and national data collection efforts

Post(racial)-Malone: (Un)conscious Habits of White Iverson

This phenomenological qualitative study explored the gender performativity of protest masculinity in a multi-institutional study of white male-identified fraternity men. The participants expressed sentiments of dispossession, postracial attitudes, and performed cultural appropriation. Participants appropriated Black culture because they considered this synonymous with their own lack of power and privilege, which they believe has been dispossessed. Implications are provided to suggest how campus-based professionals can further disrupt the (un) conscious habits of whiteness in fraternity men and forms of white supremacy through collaborative programming and campus-wide efforts

Does the Quality of Antenatal Care Predict Health Facility Delivery Among Women in Kenya? Further Analysis of KDHS Data 2008/09

Improving maternal health remains a priority in Kenya and beyond. It is essential that women get good medical care before, during and after pregnancy to reduce maternal mortality. Skilled delivery care remains low in Kenya and maternal mortality rate high regardless of numerous ongoing interventions. Antenatal care is known to promote maternal and fetal well-being. However less than 50% of women make the recommended four or more antenatal care visits, missing out on key services such as urine and blood tests, and advice on possible pregnancy complications, that determine the quality of ANC. This study examines how the number of ANC visits and the quality of those visits predict health facility use at delivery. Maternal health data from DHS of 2008/2008 in Kenya was analyzed using Stata 11.0 software. Logistic regression was used to evaluate relationships between facility delivery and predictor variables in univariate and multivariate models. Estimates were based on 95% confidence inteval. The models were examined at 95% CI and 80% power and adjusted for maternal age at last birth, education, place and type of residence, level of exposure to media, mother’s religion, wealth index and birth order. The quality of ANC was an index developed based on the number of services received during ANC visits.The quality of ANC visits progressively increased the likelyhood of health facility delivery. Supply and demand should be intervention targets to ensure that women know and understand the services to demand. Health facilities should also be sufficiently prepared and ready with the services

Developments in Practice XXXII: Successful Strategies for IT Staffing

To explore the current IT staffing challenges and issues, and how organizations are approaching these challenges and issues, we convened a focus group of senior IT managers from a variety of different companies representing several industries. In this study, we explore the number and types of IT skills that senior IT managers perceive important for their organizations, both currently and in the future. We further explore these organizations’ IT staffing practices in hiring, retention, career development and training, and performance, promotion and succession planning. The focus group anticipated some emerging trends in their future IT staffing needs, and shared some interesting techniques and strategies that they used to effectively meet the IT staffing challenges and needs. We describe the efficacy of their current IT staffing practices and the new practices that they introduced to enhance their ability to hire, retain, and develop top candidates

A New Source for Electroweak Baryogenesis in the MSSM

One of the most experimentally testable explanations for the origin of the baryon asymmetry of the universe is that it was created during the electroweak phase transition, in the minimal supersymmetric standard model. Previous efforts have focused on the current for the difference of the two Higgsino fields, $H_1-H_2$, as the source of biasing sphalerons to create the baryon asymmetry. We point out that the current for the orthogonal linear combination, $H_1+H_2$, is larger by several orders of magnitude. Although this increases the efficiency of electroweak baryogenesis, we nevertheless find that large CP-violating angles $\ge 0.15$ are required to get a large enough baryon asymmetry.Comment: 4 pages, 2 figures; numerical error corrected, which implies that large CP violation is needed to get observed baryon asymmetry. We improved solution of diffusion equations, and computed more accurate values for diffusion coefficient and damping rate