Studies of the scattering/absorption of minerals

Reflectance spectra were computed for water ice and ammonia ice mixtures as functions of weight fraction, grain size, and viewing geometry to simulate possible outer solar system satellite surfaces. Reflectance spectra of planetary surfaces are most affected by the weight fraction and grain sizes of the minerals in the surface. The reflectance can range from 1.0 to about 0.01 by changing the grain size or weight fraction, a factor of 100. Viewing geometry changes the reflectance by about 25 percent or less

Principal Solutions Revisited

The main objective of this paper is to identify principal solutions associated with Sturm-Liouville operators on arbitrary open intervals $(a,b) \subseteq \mathbb{R}$, as introduced by Leighton and Morse in the scalar context in 1936 and by Hartman in the matrix-valued situation in 1957, with Weyl-Titchmarsh solutions, as long as the underlying Sturm-Liouville differential expression is nonoscillatory (resp., disconjugate or bounded from below near an endpoint) and in the limit point case at the endpoint in question. In addition, we derive an explicit formula for Weyl-Titchmarsh functions in this case (the latter appears to be new in the matrix-valued context).Comment: 27 pages, expanded Sect. 2, added reference

Fermeture d’usine et prévention : ce mariage est-il possible?

Une fermeture d'usine dans un milieu urbain : l'impact d'un tel événement sur la santé des personnes mises à pied et sur leur entourage risque d'être lourd. Même si la littérature souligne l'intérêt et les bénéfices potentiels d'une intervention préventive, peu d'exemples d'intervention sont disponibles. Est-il possible d'intervenir dans ce contexte? Quels sont les obstacles? Nous rapportons ici une expérience concrète où nous avons tenté d'implanter un programme de prévention dans ce cadre précis. Nous dégageons les conditions qui limitent ou favorisent la réalisation d'un tel projet. Nous rapportons également les résultats d'un sondage réalisé auprès d'un échantillon de travailleurs de cette usine, sept mois après sa fermeture, et portant sur leur qualité de vie.A plant located in an urban setting closes its operations: the impact of such an event weighs heavily on the health of those who were laid off as well as family and friends. Even though relevant littérature underscores the value and potential benefits of preventive measures, few examples of actual prevention are available. Is prevention possible in such a context? What are the obstacles? The author reports on concrete experience whereby an attempt was made to set up a prevention program to deal with a plant closing. Outlined are the conditions that limit and promote such an undertaking. In addition, a survey among a sampling of laid-off workers was conducted seven months after the plant closed and focuses on quality of life

Henri Temianka Correspondence; (copland)

This collection contains material pertaining to the life, career, and activities of Henri Temianka, violin virtuoso, conductor, music teacher, and author. Materials include correspondence, concert programs and flyers, music scores, photographs, and books.https://digitalcommons.chapman.edu/temianka_correspondence/1696/thumbnail.jp