Abstract The mechanisms of propellant gas chemical erosion on gun barrel materials are discussed creatively from a microscopic perspective molecular diffusion and intermolecular interaction. influence high-temperature high-pressure atoms the shallow surface microstructure material is theoretically analyzed using dynamics simulation method, which can be used as new idea for further study mechani...

OBJECTIVE To determine whether pediatricians accurately estimate the likelihood of gun ownership among their patients' families. Design. Self-administered, written surveys completed simultaneously by pediatricians and their patients' parents. SETTING A total of 23 pediatric practices and hospital-based clinics in three cities in the United States. SUBJECTS A total of 66 pediatricians paired...

background: cancer has been known as a class of dangerous diseases which cause tremendous physical and emotional problems to both patients and their families. in spite of medical advances, cancer is still considered to be equal with death and pain. this study aims to analyze the emotional distress and the causes in breast cancer patients. methods: this study was a quantitative study which tries...

We have described the more important re­spiratory complications relating to poison­ing. Particular attention has been directed for the prevention of aspiration of stomach contents, and treatment of acid aspiration syndrome because of its poor progvosis. Re­spiratory complications may occur in 3p.c. of poisonings. In comatose patient possibility of aspiration is great. Respiratory assistance wit...

Every species has certain habitat requirements, which may be altered by interactions with other co-occurring species. These interactions are mostly ignored in predictive models trying to identify key habitat variables correlated with species population abundance/occurrence. We investigated how the structure of the urban landscape, food resources, potential competitors, predators, and interactio...

Experiments have been performed at ASDEX Upgrade, aiming to investigate the impact of lithium in an all-metal-wall tokamak and attempting to enhance the pedestal operational space. For this purpose, a lithium pellet injector has been developed, capable of injecting pellets carrying a particle content ranging from 1.82 × 10(19) atoms (0.21 mg) to 1.64 × 10(20) atoms (1.89 mg). The maximum repeti...

OBJECTIVES To describe a gun exchange program and assess potential benefits for participants and host communities. METHODS Mail survey of participants in a Sacramento, California gun exchange program, August 1993; the response rate was 79%. Comparative data were obtained from nationwide polls of gun owners. RESULTS Most (62%) respondents were men; 40% were more than 55 years old; none was l...