Leak detector Patent

Fluid leakage detection system with automatic monitoring capabilit

Q-switched laser prelase detection circuit

A compact electronic circuit was developed to detect prelasing in Q-swithed pulsed laser systems and once detected to shut down the laser before the next laser pulse occurs. The circuit is small, compact, and uses a minimum of components which makes it quite economical, thus readily lending itself to commercial applications. It can easily be incorporated into virtually any Q-switched laser system or reliability of a laser system by reducing a source of possible costly optical damage. The circuit operation and instrument requirements necessary to incorporate the circuit into a laser system are discussed

Summary of the Tandem Cylinder Solutions from the Benchmark Problems for Airframe Noise Computations-I Workshop

Fifteen submissions in the tandem cylinders category of the First Workshop on Benchmark problems for Airframe Noise Computations are summarized. Although the geometry is relatively simple, the problem involves complex physics. Researchers employed various block-structured, overset, unstructured and embedded Cartesian grid techniques and considerable computational resources to simulate the flow. The solutions are compared against each other and experimental data from 2 facilities. Overall, the simulations captured the gross features of the flow, but resolving all the details which would be necessary to compute the noise remains challenging. In particular, how to best simulate the effects of the experimental transition strip, and the associated high Reynolds number effects, was unclear. Furthermore, capturing the spanwise variation proved difficult

A system of industrialized housing for developing countries

Thesis (M.Arch)--Massachusetts Institute of Technology, Dept. of Architecture, 1962.Accompanying drawings held by MIT Museum.Includes bibliographical references (leaves 30-31).by William Kirby Lockard.M.Arc

Two-Dimensional Ffowcs Williams/Hawkings Equation Solver

FWH2D is a Fortran 90 computer program that solves a two-dimensional (2D) version of the equation, derived by J. E. Ffowcs Williams and D. L. Hawkings, for sound generated by turbulent flow. FWH2D was developed especially for estimating noise generated by airflows around such approximately 2D airframe components as slats. The user provides input data on fluctuations of pressure, density, and velocity on some surface. These data are combined with information about the geometry of the surface to calculate histories of thickness and loading terms. These histories are fast-Fourier-transformed into the frequency domain. For each frequency of interest and each observer position specified by the user, kernel functions are integrated over the surface by use of the trapezoidal rule to calculate a pressure signal. The resulting frequency-domain signals are inverse-fast-Fourier-transformed back into the time domain. The output of the code consists of the time- and frequency-domain representations of the pressure signals at the observer positions. Because of its approximate nature, FWH2D overpredicts the noise from a finite-length (3D) component. The advantage of FWH2D is that it requires a fraction of the computation time of a 3D Ffowcs Williams/Hawkings solver

Womanism and Snowball Sampling: Engaging Marginalized Populations in Holistic Research

Womanist and feminist qualitative researchers continue to identify research methods and techniques that harness the power of social networking and personal connections while engaging with marginalized populations. Many have found that the use of snowball sampling allows increased access to individuals and groups that may otherwise remain inaccessible. The purpose of this article is to discuss the use of snowball sampling techniques within womanist and feminist research. The authors offer critical reflections of the use of this sampling technique as a tool that allows researchers access to “hidden” and marginalized populations. An example of the use of snowball sampling in a doctoral research project, which looks at the experiences of Black women faculty in New Mexico’s institutions of higher education, is provided. The article concludes with recommended strategies and key considerations about the use of snowball sampling in womanist research

Wit and Sentiment: The Spirit of Shandeism in a Speechless WorId

Between the years 1759 and 1769, Laurence Sterne published a hugely popular and widely controversial work, The Life and Opinions of Tristram Shandy, Gentleman. One aspect of this shaggy dog story is to address the ambiguity and imprecision of language as a system of communication. Communication (or lack of) occurs throughout the piece both between the characters and between the narrating voice of Tristram and the constructed reader. Tristram Shandy reveals this language difficulty through several means: First is the hobby-horse, the individuals\u27 fixations and obsessions; second and connected to this idea of the hobby-horse is the John Locke\u27s philosophy of the association of ideas; third is the book\u27s sexual comedy, which reveals various characters\u27 sexual inadequacies and links them to their linguistic inadequacies. The manner in which these various language dilemmas are presented is both lighthearted and sentimental, suggesting that the solution to language\u27s inabilities to convey entire meaning or individual essence is within the context of humor and affection