5,057 research outputs found

    Project Apollo - The effect of the selection of the cabin pressure on the environmental control system

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    Effect of cabin pressure on environmental control syste

    A bibliography of six years (1951-1956) research in arithmetic

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    Thesis (Ed.M.)--Boston Universit

    A Flower at Elmira: The Prisoner of War Diary of Wilbur Wightman Gramling

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    I-want-to-go-home-so-bad. These forlorn words, expressing such homesickness, appear lengthwise within the right margin on the last page of Wilbur Wightman Gramling\u27s pocket diary, a day-by-day journal of his experiences while imprisoned at Elmira Prisoner-of-War (POW) Camp in New York during the Civil War. Struck by a minie ball in the right arm and captured at the Battle of the Wilderness on May 6, 1864, Gramling, a private in Florida\u27s 5th Infantry, spent eleven months at Elmira Prison. The journal he faithfully kept throughout his imprisonment is the only known existing document of this type written by a Florida soldier.

    A Semiempirical Investigation of Identity Reaction Proton Transfers

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    A semiempirical investigation of identity-reaction proton transfers using the AMI and PM3 methods has been carried out. Enthalpy differences between separated reactants and the ion-dipole complex (well depth) and between the complex and the transition structure (barrier height) were calculated. A comparison of carbon-to-carbon and oxygen-to-oxygen proton transfers led to the unexpected result that barriers were higher for the latter than for the former, in contrast to experimental observations in solution. The calculated values are compared with experiment and with ab initio calculations where possible, and the reliability of semiempirical calculations of well depths and barrier heights is assessed

    Adhesion between atomically pure metallic surfaces, part IV Semiannual report

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    Adhesion between metal couples in vacuum environment and use of contact resistance measurements to evaluate surface contaminatio

    An Investigation of the Prevalence of Upper Limb Neuropathies in Different Types of College Musicians by Use of Neurometrix Device

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    In general, people who perform repetitive motions are often vulnerable to repetitive strain injuries. Because musicians must execute the same motion over and over again while practicing and performing their music, they are an example of a group that often develops these repetitive strain injuries. More specifically, musicians are known for developing neuropathies in their upper limbs, with carpal tunnel syndrome and cubital tunnel syndrome being most common. However, because of varying playing postures, all musicians may not be at equal risk for developing these two neuropathies, so the purpose of this study was to identify which musician group has the highest risk of developing median and ulnar neuropathies. Results of this study show that the prevalence of carpal tunnel syndrome and cubital tunnel syndrome is fairly low, and that tingling is one of the first signs of these diseases. Also, brass players may have the highest risk of developing carpal tunnel syndrome, as only this musician group had a significant p-value when its incidence rate of carpal tunnel syndrome was compared to the incidence rate found in the general population. Finally, the results suggest that there may be a negative correlation between performing a warm-up routine and experiencing tingling. Therefore, music schools should teach all students, and especially brass players, to be aware of tingling and to take appropriate preventative measure such as warming-up in order to keep the incidence rates of carpal tunnel syndrome and cubital tunnel syndrome as low as possible

    Integrated control system for a gas turbine engine

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    A control system for a turbofan engine receives signals from a number of engine sensors and from the engine operator, and generates control signals. One control signal regulates the fan exhaust nozzle area in order to control inlet throat Mach number to maintain a low level of engine noise. Additional control signals regulate fuel flow to control engine thrust and fan pitch to control fan speed. A number of schedules are utilized to maintain a predetermined relationship between the controlled parameters and a number of fixed and calculated limits can override the control signals to prevent unsatisfactory engine performance
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