Open-celled polyurethane foam

Open-celled polyurethane foam has a density of 8.3 pounds per cubic foot and a compressive strength of 295 to 325 psi. It is useful as a porous spacer in layered insulation and as an insulation material in vacuum tight systems

Strangers in Arms: Combat Motivation in the Canadian Army, 1943-1945 (Book Review) by Robert Engen

Review of Strangers in Arms: Combat Motivation in the Canadian Army, 1943-1945 by Robert Engen

Evidence-Based Practice and Organizational Development in Libraries

This article is written for a Festschrift for F. W. Lancaster, and it summarizes the author???s library school experiences as a student of Professor Lancaster and Professor Herbert Goldhor at the University of Illinois. Both professors instilled in students a strong inclination to use real and appropriate information in evaluating situations, making decisions, delivering information services, and managing libraries. The author suggests that this Lancaster-Goldhor approach to information, and to data-driven decision making, anticipated the current movement toward evidence-based practice (EBP) in libraries. He suggests that libraries embrace the premises, philosophy, values, and practices of organizational development (OD) as an overarching discipline that facilitates EBP in the library culture, and ultimately leads to healthier and more effective organizations. This article complements a 2004 Library Trends article on OD, and numerous recent publications on OD and related topics are cited.published or submitted for publicatio

Solving California's Dropout Crisis

Synthesizes ongoing CDRP research to outline the scope, the causes, and the costs of the state's high school dropout crisis. Proposes a policy agenda to raise the graduation rate, with separate recommendations for the state, districts, and schools

Invisible Scars: Mental Trauma and the Korean War (Book Review) by Meghan Fitzpatrick

Review of Invisible Scars: Mental Trauma and the Korean War by Meghan Fitzpatrick

Comparison of data on Mutation Frequencies of Mice Caused by Radiation - Low Dose Model -

We propose LD(Low Dose) model, the extension of LDM model which was proposed in the previous paper [Y. Manabe et al.: J. Phys. Soc. Jpn. 81 (2012) 104004] to estimate biological damage caused by irradiation. LD model takes account of all the considerable effects including cell death effect as well as proliferation, apoptosis, repair. As a typical example of estimation, we apply LD model to the experiment of mutation frequency on the responses induced by the exposure to low levels of ionizing radiation. The most famous and extensive experiments are those summarized by Russell and Kelly [Russell, W. L. & Kelly, E. M: Proc. Natl Acad. Sci. USA 79 (1982) 539-541], which are known as 'Mega-mouse project'. This provides us with important information of the frequencies of transmitted specific-locus mutations induced in mouse spermatogonia stem-cells. It is found that the numerical results of the mutation frequency of mice are in reasonable agreement with the experimental data: the LD model reproduces the total dose and dose rate dependence of data reasonably. In order to see such dose-rate dependence more explicitly, we introduce the dose-rate effectiveness factor (DREF). This represents a sort of preventable effects such as repair, apoptosis and death of broken cells, which are to be competitive with proliferation effect of broken cells induced by irradiation.Comment: subimitting to J. Phys. Soc. Jpn, 32 pages, 8 figure

NASAs Plans for Development of Standards for Additive Manufactured Components

There are currently no NASA standards providing specific design and construction requirements for certification of additively manufactured parts. Several international standards organizations are developing standards for additive manufacturing; however, NASA mission schedules preclude the Agency from relying on these organizations to develop standards that are both timely and applicable. NASA and its program partners in manned spaceflight (the Commercial Crew Program, the Space Launch System and the Orion Multi-purpose Crew Vehicle) are actively developing additively manufactured parts for flight as early as 2018. To bridge this gap, NASA Marshall Space Flight Center (MSFC) has authored a center-level standard (MSFC-STD-3716)1 to establish standard practices for the Laser Powder Bed Fusion (L-PBF) process. In its draft form, the MSFC standard has been used as a basis for L-PBF process implementation for each of the manned space flight programs. The development of an Agency-level standard is proposed, which based upon the principles of MSFC-STD-3716, would have application to multiple additive manufacturing processes and be readily adaptable to all NASA programs

Laboratory investigations

Laboratory studies related to cometary grains and the nuclei of comets can be broken down into three areas which relate to understanding the spectral properties, the formation mechanisms, and the evolution of grains and nuclei: (1) Spectral studies to be used in the interpretation of cometary spectra; (2) Sample preparation experiments which may shed light on the physical nature and history of cometary grains and nuclei by exploring the effects on grain emissivities resulting from the ways in which the samples are created; and (3) Grain processing experiments which should provide insight on the interaction of cometary grains with the environment in the immediate vicinity of the cometary nucleus as the comet travels from the Oort cloud through perihelion, and perhaps even suggestions regarding the relationship between interstellar grains and cometary matter. A summary is presented with a different view of lab experiments than is found in the literature, concentrating on measurement techniques and sample preparations especially relevant to cometary dust

Study of limit cycles and stability of a space vehicle attitude control system

Limit cycles and stability of three-axis space vehicle attitude control syste