Response of tantalum capacitors to fast transient overvoltages

Report describes tests used to determine minimum time for capacitors to fail due to overvoltage and maximum amount of overvoltage that capacitors could sustain without permanent damage

Synthesis and characterization of Double-Cross Linked PVPMS Aerogels

Aerogels have been rising to the surface as a material of interest for many practical applications. Aerogels are classified as “dried gels with a very high relative pore volume”.1 Aerogels are typically created through supercritical drying, in which the liquid in a sol-gel is turned into gas without destroying the structure of the gel. The purpose of this research experiment is to create a undergraduate student laboratory for CHEM411 Materials and Synthesis of Characterization in which the students will create polyvinylpoly[1]methylsiloxane (PVPMS) aerogels from vinylmethyldimethyoxysilane (VMDMS) using a new method that has been created using ambient pressure drying rather than supercritical drying.7,8 This experiment was successful in created the PVMDMS polymer from VMDMS, and successful in creating the PVPMS hydrogel from the PVMDMS. However, the experiment was unsuccessful in drying the hydrogel into its aerogel form

Volume 25 Issue 1 Introduction

The issue of OLAQ that you currently hold in your—er—computer screen focuses on the “future organization of things.” I titled this issue not out of laziness or a lack of eloquence, but because I did not want to reduce our work to mind-numbing and siloed verbiage such as cataloging, technical services, metadata, and the long string of jargon that our job titles have become. I wanted this issue to approach current developments and future concerns of technical library work with an ease only accomplished by consulting the humble, articulate colleagues present in this state. This issue begins with a very succinct, informative overview of current developments in the field through a practical lens. Then, we’ll delve right in to faceted vocabulary, followed by lessons learned in making open electronic resources more accessible in the catalog. In fact, there are a lot of articles dealing with improving our systems and leveraging our collections, because that is what we do. Learn how to evaluate workflows across departments, migrate to more adept systems, automate past practices, and implement a new discovery layer. Last but not least, we’ll consider some personal insight on developing technical training within a tight budget. I hope you enjoy reading through the experiences of your technical colleagues and learn to appreciate the important, yet oftentimes invisible, work of organizing things

The Status of the Saturday School in the Lutheran Church--Missouri Synod

This study will be limited to a statistical analysis of the Saturday schools as they existed at the time of the survey which was taken in November 1949. It will present the reason for conducting Saturday schools as well as presenting the available evidence to show how well these aims were carried out. The physical make-up of the schools in terms of housing, teachers, sessions, enrollment and attendance figures have been included. The list of curricular activities will be discussed as well as the use of various teaching aids, such as texts, workbooks and audiovisual aids

Synthesis and Characterization of Double Cross-Linked PVPMS Aerogels

Aerogels have been rising to the surface as a material of interest for many practical applications. Aerogels are classified as dried gels with a very high relative pore volume .1 The practical applications of aerogels include thermal insulators, electrical conductors, sensors, as well as optical applications and more.2–5 Aerogels are typically created through supercritical drying, in which the liquid in a sol-gel is turned into gas without destroying the structure of the gel. However this process requires high pressures and temperatures and the solvents used are highly flammable and unsafe at these conditions.6 The purpose of this research experiment is to create a undergraduate student laboratory for CHEM411 Materials and Synthesis of Characterization in which the students will create polyvinylpolymethylsiloxane (PVPMS) aerogels using a new method that has been created using ambient pressure drying rather than supercritical drying.7,8 The method of ambient pressure drying is safer for an undergraduate laboratory and has significantly less risks than the method of supercritical drying. The proposed student laboratory would include both the synthesis and characterization of the PVPMS aerogels, which are both topics that fall under the American Chemical Society\u27s guidelines for topics in Macromolecular, Supramolecular, and Nanoscale (MSN) systems.9 Characterization of the resulting PVPMS aerogels would include density, mechanical properties, and infrared spectroscopy (IR)

Relaxation dynamics of the Lieb-Liniger gas following an interaction quench: A coordinate Bethe-ansatz analysis

We investigate the relaxation dynamics of the integrable Lieb-Liniger model of contact-interacting bosons in one dimension following a sudden quench of the collisional interaction strength. The system is initially prepared in its noninteracting ground state and the interaction strength is then abruptly switched to a positive value, corresponding to repulsive interactions between the bosons. We calculate equal-time correlation functions of the nonequilibrium Bose field for small systems of up to five particles via symbolic evaluation of coordinate Bethe-ansatz expressions for operator matrix elements between Lieb-Liniger eigenstates. We characterize the relaxation of the system by comparing the time-evolving correlation functions following the quench to the equilibrium correlations predicted by the diagonal ensemble and relate the behavior of these correlations to that of the quantum fidelity between the many-body wave function and the initial state of the system. Our results for the asymptotic scaling of local second-order correlations with increasing interaction strength agree with the predictions of recent generalized thermodynamic Bethe-ansatz calculations. By contrast, third-order correlations obtained within our approach exhibit a markedly different power-law dependence on the interaction strength as the Tonks-Girardeau limit of infinitely strong interactions is approached.Comment: 19 pages, 10 figures. v3: Final version. Typos fixed, and other minor change