Mass spectra of neutral particles released during electrical breakdown of thin polymer films

A special type of time-of-flight mass spectrometer triggered from the breakdown event was developed to study the composition of the neutral particle flux released during the electrical breakdown of polymer films problem. Charge is fed onto a metal-backed polymer surface by a movable smooth platinum contact. A slowly increasing potential from a high-impedance source is applied to the contact until breakdown occurs. The breakdown characteristics is made similar to those produced by an electron beam charging system operating at similar potentials. The apparatus showed that intense instantaneous fluxes of neutral particles are released from the sites of breakdown events. For Teflon FEP films of 50 and 75 microns thickness the material released consists almost entirely of fluorocarbon fragments, some of them having masses greater than 350 atomic mass units amu, while the material released from a 50 micron Kapton film consists mainly of light hydrocarbons with masses at or below 44 amu, with additional carbon monoxide and carbon dioxide. The apparatus is modified to allow electron beam charging of the samples

Mass analysis of neutral particles and ions released during electrical breakdowns on spacecraft surfaces

A specialized spectrometer was designed and developed to measure the mass and velocity distributions of neutral particles (molecules and molecular clusters) released from metal-backed Teflon and Kapton films. Promising results were obtained with an insulation breakdown initiation system based on a moveable contact touching the insulated surfaces. A variable energy, high voltage pulse is applied to the contact. The resulting surface damage sites can be made similar in size and shape to those produced by a high voltage electron beam system operating at similar discharge energies. The point discharge apparatus was used for final development of several high speed recording systems and for measurements of the composition of the materials given off by the discharge. Results with this apparatus show evolution of large amounts of fluorocarbon fragments from discharge through Teflon FEP, while discharges through Kapton produce mainly very light hydrocarbon fragments at masses below about 80 a.m.u

Research on magnesium antimonide and magnesium bismuthide as thermocouple materials for thermoelectric power generation

Magnesium antimonide and magnesium bismuthide evaluated as thermocouple material for thermoelectric power generatio

A case study of asthma care in school age children using nurse-coordinated multidisciplinary collaborative practices

Aim: To describe the role of school nursing in leading and coordinating a multidisciplinary networked system of support for children with asthma, and to analyze the strengths and challenges of undertaking and supporting multiagency interprofessional practice. Background: The growth of networked and interprofessional collaborations arises from the recognition that a number of the most pressing public health problems cannot be addressed by single-discipline or -agency interventions. This paper identifies the potential of school nursing to provide the vision and multiagency leadership required to coordinate multidisciplinary collaboration. Method: A mixed-method single-case study design using Yin’s approach, including focus groups, interviews, and analysis of policy documents and public health reports. Results: A model that explains the integrated population approach to managing school-age asthma is described; the role of the lead school nurse coordinator was seen as critical to the development and sustainability of the model. Conclusion: School nurses can provide strategic multidisciplinary leadership to address pressing public health issues. Health service managers and commissioners need to understand how to support clinicians working across multiagency boundaries and to identify how to develop leadership skills for collaborative interprofessional practice so that the capacity for nursing and other health care professionals to address public health issues does not rely on individual motivation. In England, this will be of particular importance to the commissioning of public health services by local authorities from 2015

The Arab\u27s Dream

https://digitalcommons.library.umaine.edu/mmb-ps/2975/thumbnail.jp

Letter to Claire Engel regarding Scholarship Committee guidelines, November 18, 1986

A letter from Kendall F. Svengalis to Claire Engel providing Engel with a copy of Scholarship Committee guidelines from another AALL chapter

A Gay Gossoon : March

https://digitalcommons.library.umaine.edu/mmb-ps/2460/thumbnail.jp

Leap Frog

Cover information surrounded by a border, with an abstract illustration below ithttps://scholarsjunction.msstate.edu/cht-sheet-music/13810/thumbnail.jp