20,488 research outputs found
Postcard from Smith Green to Paul Nelson
No full textPostcard from Smith Green to his friend, Paul J. Nelson, giving updates.Hello Paul, I'm sorry I haven't written sooner but we have been pretty busy. I'm a student here at the Infantry School in the communications course. I'm taking a special course in tank radios instead of wire. The rest of the course is the same as infantry. I'm am doing fine but don't like the country much. The chow is lousy. The fort is 9 miles S.E. of Columbus, Ga. Well pal write soon. Your buddy Smith L Green Infantry School Det. Ga. Paul J. Nelson Hq. Co. 29th Inf. Ft Sill, Oklahom
Letter from Smith Green to grandma and grandpa
No full textLetter from Smith Green to his grandparents, William and Mary Green, giving updates.ft. Benning, Georgia February 21, 1939 Dear Grandma & Grandpa, Well, here I am, in the good old cracker state. A guy out of Hdqrs. Co. 23rd Inf that I used to soldier with came with me. He is a student at the Communications School also. WE left San Antonio at 3:30 P.M. on Friday, the 17th and arrived at Columbus, Ga about 9:00 P.M. Saturday, the 18th. We came by Houston, Texas, New Orleans, La. Mobile and Montgomery, Ala. on to here. We came by Pulmann all the way. We rode the Southern Pacific to New Orleans then changed to the L. and N. we changed again at Opelika, Ala. There were two boys from the 2nd Tank Co here going to the Motor Mechanics School and I moved in just across the aisle from them. The only part of this place I don't like so far is that I'm on the 4th floor of the barracks and the mess hall is on the 1st floor. Tell every one hello for me. I must close now. ABout time for the lights to go out. I've been to the show. My address is Infantry School Detachment, Ft. Benning, Ga., or plain I.S.D. with all my love, write soon, Smith S. L. Green I.S.D. Ft Benning, Ga Mr. W.M. Green Box 426 Broken Bow, Oklahom
\u3csup\u3e40\u3c/sup\u3eAr/ \u3csup\u3e39\u3c/sup\u3eAr Ages of Metamorphic Rocks from the Tobacco Root Mountains Region, Montana
No full textMeasurements of 60 single-grain, UV laser microprobe 40Ar/39Ar total gas ages for hornblende from metamorphic rocks of the Tobacco Root Mountains in southwest Montana yield a mean age of 1.71 ± 0.02 Ga. Measurements of 40Ar/39Ar step-heating plateau ages of three bulk hornblende samples from the Tobacco Root Mountains metamorphic rocks average 1.70 ± 0.02 Ga. We believe that these and the K/Ar or 40Ar/39Ar ages reported by previous workers are cooling ages from a 1.78 to 1.72 Ga, upper-amphibolite to granulite facies, regional metamorphism (Big Sky orogeny) that affected the northwestern portion of the Wyoming province, including the Tobacco Root Mountains and adjacent ranges. Based on the 40Ar/39Ar data, this 1.78–1.72 Ga metamorphism must have achieved temperatures greater than ~500 °C to reset the hornblende 40Ar/39Ar ages of samples from the Indian Creek Metamorphic Suite, which was previously metamorphosed at 2.45 Ga, and of the crosscutting metamorphosed mafic dikes and sills (MMDS), which were intruded at 2.06 Ga. Biotite and hornblende from the Tobacco Root Mountains appear to give the same 40Ar/39Ar or K/Ar age (within uncertainty), indicating that the rocks cooled rapidly through the interval from 500 to 300 °C. This is consistent with a model of the Big Sky orogeny that includes late-stage tectonic denudation that leads to decompression and rapid cooling. A similar cooling history is suggested by our data for the Ruby Range. Three biotite samples from the Ruby Range yield 40Ar/39Ar step-heating plateau ages with a mean of 1.73 ± 0.02 Ga, identical to the best-estimate (near-plateau) age for a hornblende from the same rocks. Two samples of the orthoamphibole, gedrite, from the Tobacco Root Mountains were studied, but did not have enough K to yield a reliable 40Ar/39Ar age. Several biotite and three hornblende samples from the region yield 40Ar/39Ar dates significantly younger than 1.7 Ga. We believe these samples were partially reset during contact metamorphism by Cretaceous (75 Ma) intrusive rocks. Hydrothermal alteration associated with ca. 1.4 Ga rifting led to growth of muscovite with that age in the Ruby Range, but this alteration was apparently not hot enough to reset biotite and hornblende ages there
Letter from Smith Green to grandma and grandpa
No full textLetter from Smith Green to his grandparents, William and Mary Green, giving updates.1 Ft. Benning, Georgia June 4, 1939 Dear Grandma and Grandpa, I rec'd your most welcome letter yesterday and am taking advantage of the first opportunity to answer it. I was very glad to learn that both of you are feeling better and most earnestly that you remain that way. As for me, I am as usual, as fit as a fiddle. Well, I'll give some of the news from this neck of the woods. In the first place, I was in the review of the troops 2 here at Ft. Benning, in fact none of the sutdents were. We got to see it, though. It was in honor of a Dr. Caldwell, I think, who is president of the University of Ga. He gave a graduation speech to the officer students of the Infantry School. May 25 was the big day for the enlisted students. That's the day we got our diplomas. The commandant of the Infantry School made a speech and presented our diplomas and grades. He, General Singleton, also shook hands with us and wished us luck. My grades were pretty good for the course. I made 8 A's and 1 B. That 3 happened to be the highest in the school so I shouldn't kick. After the graduation all the Nat'l Guard students left for home. That left 29 regular Army students to put up 60 miles of overhead wire for umpire control of the coming maneuvers. That was pretty hard work, too. Anyhow, its all up now. June 1, we left our barracks and moved to tents about 15 or 20 miles out on the reservation. Here we will keep up the 4 wire lines and maintain telephone or switchboard stations until the maneuvers are over about June 9. Then we take up the wire as fast as possible and return to our respective posts. The weather is very pretty here now. However it is pretty hot. Last week it rained nearly every day. The flies are very bad and the mosquitoes do their bit also. We have negro cooks from the 24 Infantry so the chow is pretty good. I got a birth announcement from the recently blessed couple. 5 I'm going to congratulate them sometime soon. Please excuse the bad writing but I am lying down on my bunk under a mosquito net trying to write on my knoww. I can't think of anything else to write about so I will close. Tell everyone hello. Give Jewel Dean my congratulations and tell her to write. Take care of yourself. I really must close. Good bye and lots of love. Write soon, Smith S. Green I.S.D. Ft Benning, Ga Mr. W.M. Green Box 426 Broken Bow, Oklahom
GA-Fuzzy PID control simulation waveform diagram.
No full textAs is well known, the metal annealing process has the characteristics of heat concentration and rapid heating. Traditional vacuum annealing furnaces use PID control method, which has problems such as high temperature fluctuation, large overshoot, and long response time during the heating and heating process. Based on this situation, some domestic scholars have adopted fuzzy PID control algorithm in the temperature control of vacuum annealing furnaces. Due to the fact that fuzzy rules are formulated through a large amount of on-site temperature data and experience summary, there is a certain degree of subjectivity, which cannot ensure that each rule is optimal. In response to this drawback, the author combined the technical parameters of vacuum annealing furnace equipment, The fuzzy PID temperature control of the vacuum annealing furnace is optimized using genetic algorithm. Through simulation and comparative analysis, it is concluded that the design of the fuzzy PID vacuum annealing furnace temperature control system based on GA optimization is superior to fuzzy PID and traditional PID control in terms of temperature accuracy, rise time, and overshoot control. Finally, it was verified through offline experiments that the fuzzy PID temperature control system based on GA optimization meets the annealing temperature requirements of metal workpieces and can be applied to the temperature control system of vacuum annealing furnaces.</div
Advances in the Geology of the Tobacco Root Mountains, Montana, and Their Implications for the History of the Northern Wyoming Province
No full textIntegrated studies by Keck Geology Consortium participants have generated many new insights into the Precambrian geology of the Tobacco Root Mountains. We have clarified the tectonic setting and origin of two suites of metamorphic rocks: (1) a quartzofeldspathic gneiss complex with associated metasupracrustal rocks (the combined Indian Creek and Pony–Middle Mountain Metamorphic Suites) that originated in a continental arc setting between 3.35 and 3.2 Ga with subsequent sedimentation and (2) mafic metavolcanic rocks with intercalated metasedimentary rocks (the Spuhler Peak Metamorphic Suite) from a suprasubduction zone ophiolite or backarc basin possibly of Proterozoic age. A poorly preserved metamorphic event at 2.45 Ga affected the former but not the latter, as did the intrusion of rift-related mafic dikes and sills at 2.06 Ga. Both suites were amalgamated, metamorphosed to at least upper amphibolite facies, subjected to simple shear strain and folded into map- and outcrop-scale sheath folds, and tectonically unroofed during the period 1.78 to 1.71 Ga. We name this event the Big Sky orogeny.
The Proterozoic geology of the Tobacco Root Mountains can be integrated with coeval features of the geology of the northern Wyoming province to outline a northeast-trending, southeast-vergent belt as the Big Sky orogen. The Big Sky orogen consists of a metamorphic hinterland flanked to the southeast by a foreland of discrete ductile shear zones cutting older basement, and to the northwest by arc-related metaplutonic bodies and the trace of a fossil subduction zone in the upper mantle. Archean blocks to the north of the Big Sky orogen may have been accreted as allochthonous terranes during collision and convergence.
The remarkable synchroneity of collision along the Big Sky orogen with tectonism in the Trans-Hudson orogen along the eastern margin of the Wyoming province and in the Cheyenne belt to the south of the province raise profound but unanswered questions about the process by which the Wyoming province was added to the rest of the ancestral North American craton
24/7 population modelling for enhanced assessment of exposure to natural hazards
No full textThere is a growing need for accurate spatio-temporal population estimates free from arbitrary administrative boundaries and temporal divisions to make enhanced assessments of population exposure to natural hazards. The approach proposed here combines the use of a spatio-temporal gridded population model to estimate temporary variations in population with natural hazard exposure estimations. It has been exemplified through a Southampton (UK) centred application using Environment Agency flood map inundation data. Results demonstrate that large fluctuations in the population within flood risk zones occur. Analysis indicates a diurnal shift in exposure to fluvial and tidal flooding, particularly attributed to the working age population. This highlights the improvements achievable to flood risk management as well as potential application to other natural hazard scenarios both within the UK and globally
Structural analysis of Precambrian mylonite zones, Henry\u27s Lake Mountains, southwest Montana and Idaho
No full textMylonites, protomylonites, and cataclasites occur in thin, widely spaced, NE trending, NW dipping, SE verging (Fig. 5 - 7) shear zones in the Henrys Lake Mountains, the field area for the 2011 Montana, Big Sky Keck Project. Differences in protolith composition are interpreted to control position of shear zones and textural differences between mylonites, protomylonites, and cataclasites. Cataclasites likely have the highest concentrations of retrograde minerals because their highly fractured texture provided a conduit for water flow. Symplectite grew during shear, potentially as a means for volume reduction (Simpson and Wintsch, 1989). Mineral assemblages typical of greenschist facies and phengite equilibrium with k-feldspar, quartz and phlogopite suggests a minimum pressure during shear of 5 kb (0.5 GPa). As shear zones in the Henrys Lake Mountains are found to be the along strike equivalents of the 1.8 Ga Madison mylonite zone in the Southern Madison Range (Erslev and Sutter, 1990), it is believed that they are the result of shearing as part of a foreland thrust zone inboard of a major compressional orogen at 1.8 Ga (Erslev and Sutter, 1990). It is suggested that this event was the Big Sky Orogeny
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