A magnetically isolated gate driver for high-speed voltage sharing in series-connected MOSFETs

A scalable resonant gate drive circuit is described, suitable for driving series-connected MOSFETs in high-voltage, high-speed inverter applications for resistive and capacitive loads. Galvanic isolation is provided by a loop of high voltage wire, which also serves as the resonant inductor in the circuit. Fast dynamic voltage sharing is achieved by delivering equal current to each gate. A prototype is built and tested, demonstrating a 75ns switching time at 5kV using 900V MOSFETs

Space Station Freedom pressurized element interior design process

The process used to develop the on-orbit working and living environment of the Space Station Freedom has some very unique constraints and conditions to satisfy. The goal is to provide maximum efficiency and utilization of the available space, in on-orbit, zero G conditions that establishes a comfortable, productive, and safe working environment for the crew. The Space Station Freedom on-orbit living and working space can be divided into support for three major functions: (1) operations, maintenance, and management of the station; (2) conduct of experiments, both directly in the laboratories and remotely for experiments outside the pressurized environment; and (3) crew related functions for food preparation, housekeeping, storage, personal hygiene, health maintenance, zero G environment conditioning, and individual privacy, and rest. The process used to implement these functions, the major requirements driving the design, unique considerations and constraints that influence the design, and summaries of the analysis performed to establish the current configurations are described. Sketches and pictures showing the layout and internal arrangement of the Nodes, U.S. Laboratory and Habitation modules identify the current design relationships of the common and unique station housekeeping subsystems. The crew facilities, work stations, food preparation and eating areas (galley and wardroom), and exercise/health maintenance configurations, waste management and personal hygiene area configuration are shown. U.S. Laboratory experiment facilities and maintenance work areas planned to support the wide variety and mixtures of life science and materials processing payloads are described

Alien Registration- Grant, George M. (Auburn, Androscoggin County)

https://digitalmaine.com/alien_docs/30991/thumbnail.jp

Estimation of Parameters of Striped Bass Populations and Description of the Fishery of Lower Chesapeake Bay : Annual Progress Reports

Contains 3 reports covering 1967, 1967-1968, Sept. 1968- June 1969 (third annual report) Project Period: May 1, 1967 - Decemeber 31, 1969

A study of the zooplankton of lower Chesapeake Bay : NSF-RANN annual report, 1972

Studies of zooplankton are necessary to any broader investigation of aquatic ecosystems. In estuaries such as the Chesapeake Bay, zooplankton function as both detritus feeders. and primary consumers of phytoplankton. Some of them, including chaetognaths, medusae and large copepods, are members of a higher trophic level. The diversity of zooplankton, especially in neriitic areas, contributes to the complexities of such studies. The present project was intiated wholly as a result of the interest of the National Science Foundation in Chesapeake Bay and the establishment of the Chesapeake Research Consortium. The design of the research was planned to integrate with ongoing phytoplankton and plankton physiology studies at VIMS, although it was deemd necessary to cover a much wider study area t:han that of the otherr programs. No comprehensive study of the zooplankton of Chesapeake Bay has been carried out since the 1920\u27 s. Much of that work (Cowles, 1930) is in error and taxonomically obsolete. (more ...

Feasibility of using accelerometer data to quantify real-world bimanual performance and compare to in-clinic hand capacity measures in children with unilateral cerebral

Background: In CP rehabilitation, there are speculations that the capacity doesn’t necessary translate in performance. However, current laboratory and clinical assessments heavily rely on measuring the capacity of the child. By measuring the capacity of the child, we may not accurately map/predict the performance of the child in real world activities. However, we first need to understand the relationship between capacity and performance. It is imperative to understand such relationship in children with CP and compare it to that of typically developing children. Therefore, the study design has included children with CP as comparative data to typically developing children for further investigation of capacity and performance relationship to improve rehabilitation measures. Purpose of the study: To explore the changes in UE performance following HABIT using accelerometers with children with UCP. To investigate the correlation between in-clinic capacity measures and bimanual performance measures in children with UCP. Research question(s) or hypotheses: The specific aims of this investigation include the following: 1. To assess correlation between the hand capacity measures such as BBT, NHPT, and JHFT with performance measures such as accelerometry derived variables. 2. To determine the effects of Hand-Arm Bimanual Intensive Training (HABIT) on Real-world Bimanual Performance in Children with Unilateral Cerebral Palsy. Our hypothesis is that upper limb extremity capacity may have weak correlation with upper limb extremity performance in children with CP. Methodology: We will assess coordination and hand function using nine-hole peg test (NHPT), Jebson’s hand function test (JHFT), and box and block test (BBT). The upper extremity performance will be measured with the wrist worn accelerometers for 24-hours. All the data will be quantitative, and a correlation analysis will be performed using Pearson’s correlation test between accelerometry measures and upper extremity capacity measures

Chaetognatha From The Central And Southern Middle Atlantic Bight - Species Composition, Temperature-Salinity Relationships, And Interspecific Associations

Eighteen species of chaetognaths were identified from shelf waters in the Middle Atlantic Bight. Species composition in the water column and the hyponeuston was nearly identical, but the percent frequencies of the more common cold-temperate species were generally lower in surface collections. Mean surface salinity, weighted for abundance of individual chaetognath species in the hyponeuston collections, varied from 32.6 and 32.8 parts per thousand for the coastal- and estuarine-inhabiting Sagitta tenuis and Parasagitta elegans, to 34.8 and 34.9 for the offshore Pterosagitta draco and Krohnitta pacifica. Weighted mean temperatures ranged from below 14-degrees-C for Mesosagitta minima, P. elegans, and Serratosagitta tasmanica to over 24-degrees-C for K. pacifica. Overall association among Middle Atlantic Bight chaetognaths, measured for the 15 most frequent species in 716 collections by variance ratio, was significantly positive. Association between pairs of species was therefore also largely positive, with the important exception of Parasagitta elegans. This species, with a unique regional niche in low salinities and temperatures, was negatively associated (p \u3c 0.01) with five warm-water species (Krohnitta pacifica, Ferosagitta hispida, Sagitta tenuis, Sagitta helenae, and Flaccisagitta enflata). Most species reached maximum abundance at the surface near midnight. Exceptions included Sagitta helenae, with daylight maxima, and Krohnitta pacifica, Ferosagitta hispida and Serratosagitta serratodentata, showing crepuscular increases in abundance