Instrumentation

NASA derived instrumentation hardware, application, and management for utilization in electric power industr

No. 13: The Growth of Food Banking in Cities of the Global South

As the number and size of food banks increase globally, it is critical to research how food banks fit into existing food systems and their role in reducing food insecurity and food waste. After examining the political ecology of urban food waste in food systems, this discussion paper examines the globalization of food banking and its growth in the Global South. Through a case study of FoodForward SA, it critically analyzes the roles that urban food banks play in cities of the Global South. Since many countries in the South have both the highest levels of food insecurity and the weakest infrastructure, it is in these high-need locations that food banks may struggle to operate effectively. The paper finds that while food banks may improve the efficiency of food redistribution systems, it is unclear whether they reduce food insecurity or food waste in the long term. Also, many food banks suffer institutional crises related to lack of funding, interference by the state or private sector, and inappropriate placement in many parts of the Global South

Instrumentation for propulsion systems development

Apparatus and techniques developed or used by NASA-Lewis to make steady state or dynamic measurements of gas temperature, pressure, and velocity and of the temperature, tip clearance, and vibration of the blades of high-speed fans or turbines are described. The advantages and limitations of each instrument and technique are discussed and the possibility of modifying them for use in developing various propulsion systems is suggested

Small turbing-type flowmeters for liquid hydrogen

Characteristics of turbine-type flowmeters in two sizes and with various types of bearings are presented. Calibration procedures of instruments are described. Accuracies obtainable under various conditions are analyzed

[Review of] Ellen Matthews. Culture Clash

One tragedy of war is a people uprooted-tom from their land, history, and culture to seek a haven in a foreign country. Culture Clash is such a story. Ellen Matthews describes a Vietnamese family\u27s struggle to adapt to American culture and yet retain their autonomy and self-respect. As a freelance writer and sponsor of Quang and his family, the author is well qualified to write this unpretentious account of their mutual experience. Composed from a diary the author kept between 1975-1979, the text is a detailed subjective study of the day-to-day events and conflicts between herself and the Quang family

Preliminary efficacy of tooth movement in clarity aligners

The newly emerging Clarity™ Clear Aligner System from 3M has set out to address one of the biggest pitfalls of thermoplastic aligners: accuracy of orthodontic movements. The 3M Clarity™ Clear Aligner System is unique among clear aligners because it employs a proprietary, sophisticated machine-learning algorithm to design orthodontic movement schematics. The core of the Clarity™ Aligner System is artificial intelligence, meaning that a prospective analysis of preliminary data is essential for the development and improvement of the accuracy of the algorithm. This study investigates movement and accuracy of the Clarity™ Aligner System, from a preliminary data subset from ongoing prospective, randomized clinical trials. Movement from the first trial subset is examined in terms of the following movement factors: secondary premolar-secondary premolar (5+5 in the Palmer system) arch expansion or crowding resolved, absolute rotation, absolute mesial-distal tipping, and absolute torque for both the crown and root. These movements are further examined according to specific tooth types. Both actual observational orthodontic movements and theoretical movements are designed by the Clarity™ System. The accuracy of actual movement in terms of theoretical movements is calculated; however, it is impossible to calculate the significance of these accuracies due to a complete lack of benchmark movement values for the clear aligner market. There are no benchmark values to compare to, so orthodontic movements will be critically examined for performance, and casually compared to alternative aligner systems. Identifying potential weaknesses in the Clarity™ Aligner System is imperative for maximizing its effectiveness

The thermochemistry of potassium borohydride and sodium chloride pentammoniate in liquid ammonia and the relative partial molal entropy of sodium ion in liquid ammonia.

Thesis (M.A.)--Boston Universit