122,927 research outputs found
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
Full text linkFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Post-stratification and related estimators
No full textIt is the objective of this dissertation to develop techniques in current use in sample survey theory which employ auxiliary information in the form of so-called concomitant variables. The main section of this dissertation will be concerned with a situation in which the auxiliary variables will be employed to classify the sample units into "post strata". In this situation the auxiliary variables will only be known after sampling and cannot be employed for the construction of strata to be sampled in prescribed quotas. The second aspect will be concerned with so-called "regression estimators" and here the customary large sample theory of linear regression estimators with one concomitant variable will be extended to a second order (parabolic) regression. The third aspect will be concerned with extending the well-known "ratio estimators" to multivariate double ratio estimators. The objectives of this dissertation represent extension and generalizations of the three techniques named above which form part of the well-known methodology of sample surveys. In the case of "post-stratification" of the universal assumption in the literature is that the sample size of a simple random sample is large compared with the number of post strata. ..
Faust : Romance Of The Secret Tribunals / By George W. M. Reynolds, Author Of "The Mysteries Of London", "Pickwick Abroad", &c. Illustrated In The First Style Of The Art
No full textFAUST : ROMANCE OF THE SECRET TRIBUNALS / BY GEORGE W. M. REYNOLDS, AUTHOR OF "THE MYSTERIES OF LONDON", "PICKWICK ABROAD", &C. ILLUSTRATED IN THE FIRST STYLE OF THE ART
Faust : Romance Of The Secret Tribunals / By George W. M. Reynolds, Author Of "The Mysteries Of London", "Pickwick Abroad", &c. Illustrated In The First Style Of The Art (1)
Cover (1)
Umschlagtitel (8)
Titelseite (9)
Contents (10)
Illustrations / Prologue (11)
Prologue (12)
Chapter I.-XCV. (14)
Epilogue (119
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Effect of gis learning on spatial ability
Full text linkThis research used a spatial skills test and cognitive-mapping test to examine the effect of GIS learning on the spatial ability and spatial problem solving of college students. A total of 80 participants, undergraduate students at Texas A&M University, completed pre- and post- spatial skills tests administered during the 2003 fall semester. Analysis of changes in the students�� test scores revealed that GIS learning could help students improve their spatial ability. Strong correlations existed between the participants�� spatial ability and their performance in the GIS course. The research also found that spatial ability improvement linked to GIS learning was not significantly related to differences in gender or to academic major (geography majors vs. science and engineering majors). A total of 64 participants, recruited from students enrolled in Introduction to GIS and Computer Cartography at Texas A&M University, completed pre- and post- cognitive-mapping tests administered during the 2003 fall semester. Students�� performance on the cognitive-mapping test was used to measure their spatial problem solving. The study assumed that the analysis of the individual map-drawing strategies would reveal information about the cognitive processes participants used to solve their spatial tasks. The participants were requested to draw a map that could help their best friends find their way to three nearby commercial locations. The map-drawing process was videotaped in order to allow the researcher to classify subjects�� map-drawing strategies. The study identified two distinctive map-drawing strategies: hierarchical and regional. Strategies were classified as hierarchical when subjects began by drawing the main road network across the entire map, and as regional when they completed mapping sub-areas before moving on to another sub-area. After completion of a GIS course, a significant number of participants (about half) changed their map-drawing strategies. However, more research is necessary to address why these changes in strategy came about
Dasya sylviae C. W. Schneid., M. M. Cassidy & G. W. Saunders 2021, sp. nov.
No full textDasya sylviae C.W.Schneid., M.M.Cassidy & G.W.Saunders sp. nov. Fig. 2 Diagnosis Differing from most species of Dasya by its pronounced pseudodichotomous branching pattern (Fig. 2A– C), and from its most similar congener in habit, D. crouaniana J.Agardh, by its longer pseudolaterals, narrower and shorter tetrasporangial stichidia and axes fully covered with pseudolaterals to barely denuded proximal axes. The new taxon differs from all species of Dasya by its lack of post-sporangial cover cells. Etymology The species is named after Dr Sylvia A. Earle, pioneering phycologist, scientist and open-water diver, 50 years after she led the first all-female team of aquanauts in Tektite II on the floor of the Caribbean Sea (Earle 1972 a, 1972b). Material examined Type BERMUDA • Spittal, south of Cooper’s I. off Castle Harbour; 31°19.23333′ N, 64°39.53333′ W; depth 63.8 m; on rhodoliths; 11 Aug. 2016; Schneider & Popolizio 16-21-14; GenBank nos: MW698721 (holotype), MW699769 (isotype); holotype (Fig. 2A): MICH [BDA2031]; isotypes (Fig. 2B–C): Bermuda Natural History Museum, MICH, NY, UNB, US, Herb. CWS [BDA2030]. Additional material BERMUDA • Ledge north northeast of St. George’s I.; 32°28.79600′ N, 64°35.68833′ W; depth 90 m; 28 Jul. 2016; Schneider & Popolizio 16-11-1, ⊕ [BDA1969] • loc. cit.; depth 60 m; 28 Jul. 2016; Schneider & Popolizio 16-11-10 [BDA1982] • loc. cit.; 32°28.96200′ N, 64°35.25183′ W; depth 90 m; 29 Jul. 2016, Schneider & Popolizio 16-12-2 [BDA1992] • Spittal, offshore of Midocean Point; 32°19.20000′ N, 64°39.48333′ W; depth 62.7 m; 3 Aug. 2016; Schneider & Popolizio 16-17-2 [BDA2011]. Description Plants epilithic, erect to 17 cm tall, carmine red, arising from small discoidal holdfasts; indeterminate axes sympodially branched, appearing pseudodichotomously branched throughout, only slightly tapering from base to apex (Fig. 2A–C), 0.3–0.8 mm diam. in median to lower portions and completely corticated by rhizoidal downgrowth (Fig. 2D); indeterminate axes densely covered throughout with determinate, lightly pigmented, monosiphonous dichotomously branched axes (pseudolaterals; Fig. 2E), except in some older plants in the most basal portions; pseudolaterals 1.7–5.5 mm in length, 25–91 cells from base to apex, irregularly dichotomously branched from the first to the seventh cell of the pseudolateral, upper portions unbranched and slightly tapering (Fig. 2E); basal cells of pseudolaterals initially globose to ellipsoid (Fig. 2D), 21–37 µm diam. and 12–30 µm long, then slightly elongating; suprabasal cells 19–32 µm diam. and 8–32 µm long, elongating more centrally, 9–22 um diam. and 27–102 µm long, and reaching greatest lengths distally, 8–19 µm diam. and 32–127 µm long; tetrasporangial stichidia single, borne terminally on 3–7-celled unbranched pseudolaterals (Fig. 2F) or terminating basal dichotomies of pseudolaterals (Fig. 2G), lanceolate to narrowly elliptical in outline (Fig. 2F–G), 73–80 µm diam. and 269–305 µm in length at maturity, composed of 10–12 fertile segments, acropetally producing then releasing sporangia (Fig. 2F–G); sporangia globose, 21–29 µm diam., tetrahedrally divided, 3–5 per fertile segment, sporangia borne on 2-celled whorled branches, post-sporangial cover cells lacking (Fig. 2F); one to two spermatangial stichidia terminating a basal dichotomy on 4–10-celled pedicels (pseudolaterals), narrowly elliptical to lanceolate in outline (Fig. 2H), 46–69 µm diam. and 192–258 µm in length at maturity; carpogonial branches and cystocarps unknown. Distribution and habitat At present, endemic to mesophotic reefs off Bermuda, western Atlantic Ocean.Published as part of Schneider, Craig W., Cassidy, Margaret M. & Saunders, Gary W., 2021, The pseudodichotomous Dasya sylviae sp. nov. (Delesseriaceae, Ceramiales) from 60 - 90 m mesophotic reefs off Bermuda, pp. 24-37 in European Journal of Taxonomy 751 on pages 28-32, DOI: 10.5852/ejt.2021.751.1377, http://zenodo.org/record/481842
Geologic atlas of the United States : topography, areal geology, economic geology, structure sections / 141 Bald Mountain - Dayton Folio : Wyoming
No full textE. M. Douglas ; W. S. Post ; Frank TweedyList of Sheets: Topography, Areal Geology, Economic Geology, Structure-SectionIndirektes handschriftliches Exlibris: "1908, 214", das ist United States Geological Survey Washington Exemplar der ETH-BI
Dissection of the functional domains and ATP binding sites of carbamoyl phosphate synthetase from Escherichia coli
No full textTypescript (photocopy).The putative domains of the large subunit of carbamoyl phosphate synthetase from Escherichia coli have been isolated and characterized for carbamoyl phosphate synthesis, ATP synthesis, and bicarbonate-dependent ATPase activity. Through analysis of five different constructions of the large subunit, it has been determined that the putative domains are not independently active units within the protein. The results suggest that the entire length of the large subunit polypeptide is required for activity and stability. Additionally, at least the carboxy-terminal domain appears to be necessary for adequate small subunit interaction. The catalytic functions of the amino-terminal and carboxy-terminal halves of the large subunit of carbamoyl phosphate synthetase have been identified using site-directed mutagenesis. The mutations on the amino-terminal half, G176I and G180I, caused slight reduction in the rate of synthesis of ATP from ADP and carbamoyl phosphate (the partial ATP synthesis reaction), but the bicarbonate-dependent ATPase reaction velocity was reduced to less than 10% of the wild-type rate. The mutant G722I, which is on the carboxy-terminal half, caused the partial ATP synthesis reaction to be reduced by one order of magnitude but the bicarbonate-dependent ATPase reaction was reduced only slightly. These results have been interpreted to suggest that the amino-terminal domain contains the portion of the large subunit that is involved with phosphorylation of bicarbonate to carboxyphosphate. The carboxy-terminal domain contains a region of the enzyme that catalyzes the phosphorylation of carbamate to carbmoyl phosphate. Site-directed mutagenesis was additionally used to substitute two strictly conserved histidine residues on the large subunit of carbamoyl phosphate synthetase with asparagine residues. Based on preliminary data from pH rate profiles and chemical modification studies with diethylpyrocarbonate, it is suggested that one or more histidine residues may play a role in the carbamoyl phosphate synthetase mechanism. Site-directed replacement of histidine-243 to asparagine resulted in the loss of all catalytic activity for carbamoyl phosphate synthesis, but the partial ATPase and ATP synthesis activities remained unchanged. The replacement of histidine-788 to asparagine also resulted in loss of carbamoyl phosphate synthesis. The partial ATPase activity, however, was reduced ten-fold. This activity could be restored in the presence of saturating concentrations of glutamine. The partial ATP synthetase activity was unaffected in the H788N mutant. These results indicate that the reaction of ammonia with carboxyphosphate has been disrupted by these modifications
An investigation of the impact behavior of a rigid body
No full textModern freeways require adequate lighting facilities, and in order to meet lighting requirements, light posts sometimes have to be located near the edge of the traffic lane. Single post sign standards and stop light posts are also necessary. Each of these post installations is often located so as to constitute a safety hazard and collision with these posts can cause fatalities. The Texas Transportation Institute at Texas A & M University has been investigating the methods of developing supports that will limit impact forces to tolerable limits and a design showing considerable merit is the "break-away" post that disengages the post from its foundation upon impact. Normally posts are quite massive and after impact they could be knocked into the path of the vehicle, or onto the highway, causing an unsafe condition for other motorists. In this research, the work was directed toward developing a post system that, upon impact, would be knocked out of the vehicular path and caused not to land on the highway causing hazardous circumstances. The post model was assumed to be a rigid body under the action of constant and time dependent forces while the vehicle was taken as a spring-mass system with a single degree of freedom. ..
Perspektywy rozwoju biotechnologii w Polsce
Full text linkWażnym czynnikiem rozwoju biotechnologii w Polsce są nowoczesne badania naukowe. Artykuł Perspektywy rozwoju biotechnologii w Polsce zwraca uwagę na to, że wiedza z zakresu nauk biologicznych i medycznych przyczynia się do większej konkurencyjności zarówno ośrodków naukowych i badawczych, jak i przedsiębiorstw. Biotechnologiczne projekty naukowo–badawcze realizowane w Polsce nie tworzą jeszcze podstaw do wytwarzania produktów biotechnologicznych w takim zakresie, by polskie przedsiębiorstwa mogły konkurować na rynku międzynarodowych. Jedną z przyczyn, którą analizuje Autor w artykule, jest niewystarczające inwestowanie w rozwój nauki i wsparcie dla małych i średnich firm w sektorze biotechnologii. MSP są najważniejszym elementem rozwoju tego sektora, ponieważ koncentrują się na tworzeniu i rozwoju nowoczesnych produktów biotechnologicznych. Artykuł został podzielony na dwie części: Szanse rozwoju nowoczesnej gospodarki w Polsce bez biotechnologii oraz Edukacja i projekty B+R. Autor finalizuje rozważania, pokazując pozytywny scenariusz dla rozwoju sektora biotechnologicznego w Polsce.Biotechnology uses biological processes in the development of technology or manufacture of a product. It is forecasted that Polish biotechnology industry will exceed very quickly. The technology and science parks in Poland have invested millions Euros to build new laboratories. Polish market is fuelled by increased R&D funding, central and regional governments initiatives. The article on “Polish perspectives of biotechnology development” identifies significant factors for biotechnology project development. It also indicates the examples of government biotechnology initiatives in the world. The author focuses on the statistical analysis of the research and development projects conducted by Polish scientist in scientific laboratories. His main conclusion is that biotechnology will be very important in developing Poland, Polish universities, research and development organizations.Udostępnienie publikacji Wydawnictwa Uniwersytetu Łódzkiego finansowane w ramach projektu „Doskonałość naukowa kluczem do doskonałości kształcenia”. Projekt realizowany jest ze środków Europejskiego Funduszu Społecznego w ramach Programu Operacyjnego Wiedza Edukacja Rozwój; nr umowy: POWER.03.05.00-00-Z092/17-00
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