181,661 research outputs found
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing 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
Tessere il comune nella crisi. Autogestione del lavoro e conflitti urbani nelle economie popolari a Buenos Aires
No full textQuesta tesi dottorale propone una analisi critica dei processi sociospaziali delle esperienze di autogestione del lavoro, a partire da una ricerca sul campo nell’area metropolitana di Buenos Aires con due esperienze di autogestione cooperativa, una fabbrica recuperata e una cooperativa tessile dell’economia popolare. La ricerca etnografica si è svolta nell’ambito di spazi di autoformazione e collaborazione con i lavoratori e le lavoratrici, con la partecipazione a percorsi di mobilitazione e formazione politica e sindacale. Analizzando le traformazioni del lavoro nella crisi, la tesi focalizza l’attenzione sui processi di soggettivazione dei lavoratori senza padrone, le modalità in cui queste trame ridefiniscono dal basso l’urbano producendo nuovi spazi, territori e dinamiche di conflitto urbano a fronte della riconfigurazione estrattiva del capitalismo finanziario globale. La tesi è strutturata in tre assi tematico-concettuali divisi in sei capitoli: dopo il primo capitolo dedicato alla revisione critica delle relazioni tra urbanizzazione, estrattivismo e accumulazione del capitale nella crisi, vengono analizzati i processi di soggettivazione nelle esperienze di autogestione (secondo e terzo capitolo), le trame sociospaziali e l’autogestione di servizi, reti produttive e riproduttive nei territori (quarto e quinto capitolo), i conflitti sociali e l’istituzionalità popolare (sesto capitolo).
Dopo aver delineato nel primo capitolo problematiche, concetti e prospettive critiche che dall’America Latina contribuiscono a pensare l’eterogeneità e la moltiplicazione del lavoro oltre la nozione di informalità, il primo asse è dedicato all’analisi etnografica della soggettivazione politica nelle due esperienze. Nel secondo capitolo si ricostruisce la genealogia della cooperativa tessile Juana Villca, le ambivalenze e le difficoltà dell’autogestione del processo di lavoro da parte di lavoratori migranti inseriti in condizioni subalterne nel mercato del lavoro, riflettendo sulle forme di conflitto sociale nella crisi e i processi di soggettivazione politica. Il terzo capitolo è dedicato all’analisi del processo di occupazione e recupero della fabbrica recuperata 19 de Diciembre, le sperimentazioni produttive e la creazione di nuove modalità di lavorare in autogestione e al tempo stesso di forme complesse, dense di ambivalenze, di negoziazione con lo Stato e con il mercato. Nel quarto e quinto capitolo viene sviluppato il secondo asse, l’analisi delle trame sociospaziali delle cooperative e le trasformazioni delle relazioni tra produzione e riproduzione sociale nel processo di autogestione. Analizzando laboratori di mappature collettive e interviste, si riflette sulle modalità in cui differenti soggettività producono, sostengono e riorganizzano nuovi territori urbani e ridefiniscono la relazione tra produzione e riproduzione, lavoro e militanza politica. Da una parte, le trame territoriali eccedono i limiti di ciò che chiamiamo lavoro, risignificandolo e connettendo modi di vivere, produrre e riorganizzare l’urbano, permttendoci di contribuire ad una conezione più ampia del processo di urbanizzazione popolare. Dall’altra parte, riprendendo la critica femminista dell’economia, vediamo come le separazioni e gerarchizzazioni tra attività produttive e riproduttive vengono messe in tensione e ripensate a partire dall’organizzazione materiale, pratica, discorsiva, spaziale e simbolica nelle due esperienze, modificando pratiche di lotta e modalità di oprganizzare il comune come relazione sociale e come modo di produzione. Il sesto capitolo, dedicato al conflitto sociale e al nuovo sindacalismo nelle esperienze di autogestione, è focalizzato sull’analisi delle pratiche della conflittualità sociale nella crisi, in relazione con i dispositivi estrattivi della finanza e con il concetto di istituzionalità popolare, per ripensare le relazioni tra autogestione del lavoro, urbanizzazione popolare e conflitto urbano. Infine, contestualizzando i processi di politicizzazione delle condizioni di vita e di lavoro nello scenario della crisi, si sostiene che le trame riproduttive, gli spazi e i processi sociali delle esperienze di autogestione del lavoro costituiscano le infrastrutture di una istituzionalità popolare emergente, di cui si analizzano limiti, ambivalenze e potenzialità
Intern experience at CH���M Hill, Inc.: an internship report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesA review of the author's internship experience with CH���M HILL, Inc.
during the period September 1975 through May 1976 is presented. During this nine month
internship the author worked as an Engineer II in the Industrial Processes discipline of this
large consulting engineering firm... The author's prime responsibility was as one of three
lead design engineers on the design of a large wastewater treatment facility for a pulp mill
in Hoquiam, Washington owned by ITT Rayonier Inc. The work generally consisted of the design
of individual treatment units and associated piping and pumping. The purpose of the project
was to provide wastewater treatment capabilities that would satisfy the effluent limitations
(standards) imposed upon the mill by the State of Washington Department of Ecology and the
U.S. Environmental Protection Agency. The author's assignment also entailed necessary
interaction with the project manager and other CH���M HILL design engineers and support staff
members, the client's representatives, and representatives of two other consulting engineering
firms working on the project. Thus, the internship position at CH���M HILL provided considerable
experience coordinating the author's work with the work of other engineers, guiding the design
and administrative efforts of a support staff, and interacting regularly with the client and
other consulting firms. This broad exposure to a variety of engineering and organizational
problems provided a valuable educational experience
Management information for ecologically—oriented decision–making : a case study of the introduction of co–generation in eleven spanish companies.
No full textThe purpose of this case study was to provide a report on the motivations which have led Spanish managers in the Galician region to take a green pathway. Such decisional processes may reflect a change in corporate consciousness, or it might be just another corporate response to increased political visibility and possible government intervention (Rodgers, 1991, 1992, Rodgers and Gago, 2001). The study focuses on eleven Spanish companies who instead of purchasing energy decided to produce their own energy using a co-generation system. A case study approach was selected in order to interpret the information provided concerning the adoption of a co-generation corporate strategy (Parker, and Roffey, 1997). Accounting information systems are considered to be important in this process as they select, classify and arrange information to inform their communities. Their design and implementation highlight environmental contingencies as they affect business entities' ability to operate. The results of the case study survey confirm that management benefit through cost savings and additional incomes. The article concludes by observing that the ecological implications of co-generation were not the primary motivation for adopting the 'green' innovation.
Intern experience at the Texas Transportation Institute: an internship report
No full text"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirements for the degree of Doctor of Engineering."Includes vita (leaf 91)Includes bibliographical references (leaf 57)This report discusses the author's engineering experience at the Texas
Transportation Institute (TTI), Texas A&M University from March 1974 through July 1977. A
report of this experience plus twelve additional hours of academic course work were
substituted for an internship according to requirements established by the College of
Engineering. Although the author could not retroactively establish objectives of the type
associated with a typical internship, the work experience gained could be related to the two
general objectives of an intership: 1. To demonstrate an identifiable contribution to the
organization in which the intern served, and 2. To enable the intern to become aware of the
non-technical aspects of working as an engineer in a non-academic environment. While a member
of the Texas Transportation Institute staff, the author worked on a number of projects in the
areas of highway traffic engineering research and the preparation of continuing education
courses for transportation engineering officials. These assignments were contained within the
Urban Transportation Systems Division of TTI. This report delineates the author's contribution
to four particular projects and discusses the technical as well as non-technical experience
gained from each. Having been exposed to more engineering situations than many of the other
Doctor of Engineering students, the author has already formulated some rather specific
milestones for the future. The Doctor of Engineering program is discussed in conjunction with
its potential for helping the author attain these career goals and objectives. Also, some
thoughts are presented regarding the Doctor of Engineering as a viable alternative to the
Ph.D. in preparing for a career in engineering higher education
Türk, la pulsación y el legato: la búsqueda de una base lógica
No full textEs una traducción de: Türk, touch and slurring: finding a rationale, en Early Musie, Vol. XVII núm. 1 (Febrero 1989, pp. 55-59).Luis Carlos Gago (traductor)
How do vascular plants perform photosynthesis in extreme environments? An integrative ecophysiological and biochemical story
No full textLa investigación de BF, JIG, MJCMM., J. Gago y J. Gulias está financiada por los proyectos del Ministerio de Ciencia, Innovación y Universidades (España), PGC2018-093824-B-C41 y C-44. BF y JIG agradecen al proyecto UPV/EHU-GV IT-1018-16 del Gobierno Vasco (España). CMF está financiado por la Sociedad Max Planck (Grupo asociado en Bioquímica Vegetal). LAB agradece a NEXER NXR17-0002 por el apoyo financiero. ARF reconoce el apoyo de la Deutsche Forschungsgemeinschaft en el marco del centro de investigación colaborativo transregional TRR175 (Alemania). LAC reconoce el apoyo del programa de profesores visitantes de la Universitat de les Illes Balears. J. Gago reconoce el contrato postdoctoral de la Universitat de les Illes Balears. CI ha recibido una beca postdoctoral del Gobierno de las Islas Baleares.The research of BF, JIG, MJCMM., J. Gago and J. Gulias is supported by the projects from the Ministerio de Ciencia, Innovacion y Universidades (Spain), PGC2018-093824-B-C41 and C-44. BF and JIG thank the project UPV/EHU-GV IT-1018-16 from the Basque Government (Spain). CMF is funded by the Max Planck Society (Partner Group for Plant Biochemistry). LAB is grateful to NEXER NXR17-0002 for financial support. ARF acknowledges the support of the Deutsche Forschungsgemeinschaft in the framework of the transregional collaborative research centre TRR175 (Germany). LAC acknowledges support from the visiting professor programme of the Universitat de les Illes Balears. J. Gago acknowledges the postdoctoral contract from Universitat de les Illes Balears. CI has been supported by a postdoctoral grant from the Government of the Balearic Islands
The long-wavelength view of GG Tau A: rocks in the ring world
No full textWe present the first detection of GG Tau A at centimetre wavelengths, made with the Arcminute Microkelvin Imager Large Array at a frequency of 16 GHz (λ = 1.8 cm). The source is detected at >6 σrms with an integrated flux density of S16GHz = 249 ± 45 µJy. We use these new centimetre-wave data, in conjunction with additional measurements compiled from the literature, to investigate the long-wavelength tail of the dust emission from this unusual protoplanetary system. We use an MCMC-based method to determine maximum likelihood parameters for a simple parametric spectral model and consider the opacity and mass of the dust contributing to the microwave emission. We derive a dust mass of Md ~ 0.1 Msun, constrain the dimensions of the emitting region and find that the opacity index at λ > 7 mm is less than unity, implying a contribution to the dust population from grains exceeding ~4 cm in size. We suggest that this indicates coagulation within the GG Tau A system has proceeded to the point where dust grains have grown to the size of small rocks with dimensions of a few centimetres. Considering the relatively young age of the GG Tau association in combination with the low derived disc mass, we suggest that this system may provide a useful test case for rapid core accretion planet formation models
CIRCA-97: Hydrographic data of Ria de Vigo (1997)
No full textEste dataset está compuesto por 2 archivos, de los cuales el primero es el conjunto de datos con 547 análisis de muestras de agua de temperatura, salinidad, oxígeno, nutrientes, pH, alcalinidad y clorofila, y el otro (Readme.txt) incluye una pequeña descripción de las variables calculadasSe estudió el efecto de la variabilidad a corto plazo (2-4 días) de los eventos de upwelling y hundimiento en los campos de pCO2 para evaluar la importancia relativa de los procesos físicos y biológicos en la variabilidad de pCO2. Además, se determinan las tasas netas de producción de especies de carbono en el ecosistema (DIC, POC, DOC) con el fin de evaluar la importancia relativa de la acumulación frente a la exportación de las fracciones orgánicas disueltas y de partículas recientemente formadas.
Durante 1997, se tomaron muestras de cinco períodos contrastantes: 7-23 de abril, 1-18 de julio, 15 de septiembre-2 de octubre, 28 de octubre-6 de noviembre y 1-11 de diciembre a bordo del R/V ''Mytilus'' del Instituto de Investigaciones Marinas (Vigo, España). Se registraron perfiles de profundidad completos de conductividad-temperatura y profundidad en cada estación con un perfilador SBE 25 CTD. Las mediciones de la conductividad se convirtieron en valores prácticos de la escala de salinidad (UNESCO, 1985). La precisión de las mediciones de CTD fue para la temperatura y la salinidad se estima que son exactos a 0,004 DEG-C y 0,005, respectivamente. Se recogieron muestras de agua de mar para la determinación de oxígeno disuelto (O2), pH, alcalinidad total, DOC y carbono orgánico en suspensión (POC) y nitrógeno (PON) de 3 a 5 profundidades (1, 5 y 10 m en la estación 1; 1, 5, 10 y 20 m en la estación 2; 1, 7, 15, 25 y 40 m en la estación 3; 1, 7, 15 y 25 m en la estación 4; 1, 7, 15, 25 y 50 m en la estación 5), con botellas de 5 L de Niskin. El oxígeno fue determinado por titulación potenciométrica de Winkler usando un analizador Titrino 720. El pH fue medido potenciométricamente (Pérez & Fraga 1987a). La Alcalinity se determinó mediante una valoración potenciométrica del punto final (Pérez & Fraga 1987b). Los electrodos fueron calibrados a la escala del National Bureau of Standards (US). La precisión de las mediciones de pH y AT fue de ±0,010 y 2 micromol kg-1, respectivamente, según se determinó utilizando muestras de los lotes 33, 35 y 37 del material de referencia certificado (CRM) proporcionado por el Dr. A. Dickson, de la Universidad de California. Las muestras de DOC fueron previamente tratadas para la remoción de materia orgánica particulada por filtración a través de filtros GF/F de 47mm (precombustión 450 DEG-C, 4 h). Las muestras de DOC fueron analizadas con un 'Shimadzu TOC-5000' por el método de oxidación catalítica a alta temperatura descrito en Alvarez-Salgado, Gago et al. El POC y el PON se recogieron en filtros GF/F de 25 mm (450 DEG-C precombustible, 4 h) y se determinaron con un analizador Perkin-Elmer 2400 CHNCSIC y Plan Nacional de I+D del Gobierno de EspañaPeer reviewe
Crisis, cambio en la UE y estrategias sindicales : el impacto de la condicionalidad en el repertorio estratégico de los sindicatos españoles durante la crisis de la eurozona
No full textResumen
Durante la crisis de la eurozona, los gobiernos del PSOE y del PP implementaron una serie de
reformas del Estado de Bienestar y del mercado laboral a cambio de ayuda financiera por parte
de la Unión Europea, lo que se conoce como condicionalidad. Los sindicatos, CC. OO. y
UGT, respondieron ante tales reformas como representantes de los colectivos más afectados
por las mismas. Existen dos argumentos distintos que explican las estrategias de los sindicatos
durante la crisis. Por una parte, se argumenta que los sindicatos utilizaron la acción política
tradicional para influir en los procesos de toma de decisiones. Por otra parte, los sindicatos han
puesto en marcha nuevas acciones bien de carácter transnacional o relacionadas con actividades
propias de los movimientos sociales. El artículo explica por qué la crisis dio lugar a esta nueva
combinación de repertorios sindicales que apelan a sectores y niveles de acción distintos. El
argumento principal es que la condicionalidad de la UE dio lugar a la aparición de un nuevo
régimen de decisión política que denominamos aquí «intergubernamentalismo neoliberal» por
los cambios institucionales e ideológicos que trajo consigo. A su vez este nuevo régimen impactó
en la estructura de oportunidad política, provocando una reorientación estratégica de los
sindicatos
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