12,238 research outputs found

    Lunar orbiting microwave beam power system

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    A microwave beam power system using lunar orbiting solar powered satellite(s) and surface rectenna(s) was investigated as a possible energy source for the Moon's surface. The concept has the potential of reduced system mass by placing the power source in orbit. This can greatly reduce and/or eliminate the 14 day energy storage requirement of a lunar surface solar system. Also propellants required to de-orbit to the surface are greatly reduced. To determine the practicality of the concept and the most important factors, a zero-th order feasibility analysis was performed. Three different operational scenarios employing state of the art technology and forecasts for two different sets of advanced technologies were investigated. To reduce the complexity of the problem, satellite(s) were assumed in circular equatorial orbits around the Moon, supplying continuous power to a single equatorial base through a fixed horizontal rectenna on the surface. State of the art technology yielded specific masses greater than 2500 kg/kw, well above projections for surface systems. Using advanced technologies the specific masses are on the order of 100 kg/kw which is within the range of projections for surface nuclear (20 kg/kw) and solar systems (500 kg/kw). Further studies examining optimization of the scenarios, other technologies such as lasers transmitters and nuclear sources, and operational issues such as logistics, maintenance and support are being carried out to support the Space Exploration Initiative (SEI) to the Moon and Mars

    Teamwork and organizational innovation: the moderating role of the HRM context

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    Evidence is accumulating on the role of teams in shaping a variety of business outcomes, but our knowledge on the effect of teamwork on organizational innovation is still evolving. This study examines whether the extent to which two staff groups are organized in teams (production staff and management/administrative staff) affects organizational innovation and whether human resource management (HRM) systems, which can be of facilitating or con- straining nature, enhance the teamwork/innovation relationships. Hypotheses were tested with lagged and longitudinal data derived from 18 to 45 organizations from the UK manufacturing sector. Results suggest that the more widespread the use of teamwork in organizations, the higher the level of organizational innovation. Furthermore, this effect depends, particularly for production teams, on the overall quality of the HRM systems that exist in their organizations. Teamwork/innovation relationships are further moderated (for management and administrative teams) by an HRM practice that provides teams with time for thoughtful reflection. Thus, HRM systems can be of more or less facilitating or constraining nature for teams in organizations

    Letter from Fay H. Sellers to John Muir, 1913 Sep 12.

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    [1]Pasadena Sept 12, 13Dear friend Mr. Muir.I have been so ill for a month that I have been down stairs but three or four times_ However I am better now, and hope soon to be so much improved in health, that I can go to Los Angeles twice a week for electrical treatment, which I am told will benefit me. Thank you for the kindly feeling which05532 [2]prompted you to offer me that beautiful set of your books, decribed by me in my last letter, but as I have those you gave me some time ago, and which I prize so very highly, I will not be so selfish as to take the other set. You know though, how much I appreciate your kindness in wishing to give them to me and again, I thank you.[3]It was good news to hear that you had taken a vacation, if only a short one. You needed it after your strenuous work for so many months. Now, no doubt, you will be busier than ever with the Hetch-Hetchy fight. I trust your hope of victory will be fulfilled. It has been a long fight. God bless you dear Mr. Muir. Ever your true friendFay H. Seller

    Carnivorous Walrus and Some Arctic Zoonoses

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    Reviews reports of walrus feeding on seal or whale carrion, or killing them for food. Normally, bottom feeders (benthic invertebrates) in shallow, continental waters, walrus eat mammals when/where invertebrates are unobtainable. The (rare) rogue walrus, habitually carnivorous, has a distinctive external appearance. Some catch data are given with estimates of the carnivores, also those with Trichinella infection. The possibility is aired that such animals like the polar bear, have a high vitamin A content in their liver, or may be a source of trichinosis transmissible to man. Comments by T. H. Manning in Arctic, Mar. 1961, p. 76-77

    Applications of the induced morphism theorem in regular categories

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    Alien Registration- Curtis, Fay H. (Clinton, Kennebec County)

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    https://digitalmaine.com/alien_docs/17632/thumbnail.jp

    Letter from Fay H. Sellers to [John Muir], 1913 Mar 3.

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    [2]not however remain much longer, having made her arrangements to return home in April. She is to visit her mother and daughter in Oregon before that time, consequently I will have to give her up soon. As I wrote you in my last letter, I will go to Chicago and decide later what is the best thing for me to do, live in a hotel, coming here winters or take a house there. I get very homesick when I think of[1]Pasadena Mch 3-13Dear friend.I am still in Pasadena where I expect to remain until there is a prospect of selling the house. I have put it in the hands of Mr. Luckwood to sell. hoping he may find a purchaser soon- although one cannot always dispose of a house immediately upon offering it for sale. My sister-in-law is still with me. She can05386 [3]going away from Pasadena. for I like it here. No doubt when I go to Chicago, everything will be different there, and it may not seem like home. Five years have probably made many changes there too. I will let you know as soon as I know myself where I am going. It may be two months before I can dispose of my things here and be ready to go. If you come to Los Angeles, you will come to see me, won\u27t you? I would be very unhappy to go away without seeing you again. God bless you dear Mr. Muir. for you have indeed been a dear and kind friend.Your sincere friendFay J. Sellers

    Letter from Fay H. Sellers to John Muir, 1912 Sep 19.

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    [2]days, and will then see Helen, In your letter to me your say Helen\u27s husband and her eldest boy have been ill. I do not understand it quite, for I had not heard that the stork had visited Helen and her husband for the second time. I am so sorry to learn that Mr. Buell and dear little Muir have been ill.[1][letterhead]Sept 19-12Dear Mr. Muir,I have just gotten up from a sick bed where I have been for two weeks. Was threatened with pneumonia and other complications. However I am now rapidly recovering and hope to be out again in a few05276 [3]I never go out anymore to see my friends, although I ride out every day when I can, just run over to Tropico where my sister lives. Soon my sister-in-law will come to California for a visit, and I am looking forward with pleasure to it. She will be a comfort to me helping me to live through this awful loneliness. Just imagine Mr. Muir what this means to me to be so absolutely alone. All summer I have been here prefering it however to being with people who did not interest me. You do not say anything about your Alaska trip. Hope you enjoyed it, but that goes without saying, as you[4]always are in your native element when visiting such interesting places and heartily enjoy and appreciate them. Good-bye. Soon I will see Helen and her dear ones, and hope to find them well. With kindest remembrance I am as ever your sincere friendFay H. Sellers0527

    An accurate formula for the period of a simple pendulum oscillating beyond the small-angle regime

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    A simple approximation formula is derived here for the dependence of the period of a simple pendulum on amplitude that only requires a pocket calculator and furnishes an error of less than 0.25% with respect to the exact period. It is shown that this formula describes the increase of the pendulum period with amplitude better than other simple formulas found in literature. A good agreement with experimental data for a low air-resistance pendulum is also verified and it suggests, together with the current availability/precision of timers and detectors, that the proposed formula is useful for extending the pendulum experiment beyond the usual small-angle oscillations.Comment: 15 pages and 4 figures. to appear in American Journal of Physic
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