EJERCICIOS RESUELTOS DE GRAVIMETRIA QUIMICA ANALITICA PDF

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Application of the Pinch analysis for the design of a cogeneration system in a paper mill; Aplicacion del analisis Pinch para el diseno de un sistema de cogeneracion en una industria papelera.

Mani Gonzalez, A. The Pinch Analysis is a set of principles, tools and rules for the design that allow the engineer find the best way to configure the elements of a process. In the last ten years it has been utilized for the design of new processes as well as in the energy optimization of existing processes. In this paper the tools utilized for the integration of a cogeneration system in a process for the production of paper is presented.

It is also presented how the combined treatment of the Pinch Analysis and the exergy concept allows to define, before the detailed design, the cogeneration potential, the fuel consumption and the amount of pollutant emissions for different cogeneration schemes.

En los ultimos diez anos se ha utilizado para el diseno de procesos nuevos asi como en la optimacion energetica de procesos existentes. En el presente articulo se presentan las herramientas utilizadas para la integracion de un sistema de cogeneracion en un proceso de produccion de papel.

Se muestra tambien como el tratamiento combinado del analisis Pinch y el concepto de energia permite definir, antes del diseno detallado, el potencial de cogeneracion, el consumo de combustible y la cantidad de emisiones contaminantes para diferentes esquemas de cogeneracion. Questo lavoro di tesi si e' svolto nell'ambito dell'esperimento CMS a LHC, ed in particolare verte sullo studio delle strategie di identificazione off-line del leptone tau, atteso tra i prodotti di decadimento del bosone di Higgs, cosi' come di altre particelle previste in altri modelli teorici.

Il canale utilizzato per testare la procedura di identificazione del tau e' il decadimento semileptonico del bosone vettore W.

Analisis del sistema Paraguayo de investigacion agropecuaria. Analisi matematica del problema dello spazio. Environmental analysis of natural gas life cycle; Analisi ambientale del ciclo di vita del gas naturale. Life Cycle Assessment is a method aimed at identifying the environmental effects connected with a given product, process or activity during its whole life cycle. The evaluation of published studies and the application of the method to electricity production with fossil fuels, by using data from published databases and data collected by the gas industry, demonstrate the importance and difficulties to have reliable and updated data required for a significant life cycle assessment.

The results show that the environmental advantages of natural gas over the other fossil fuels in the final use stage increase still further if the whole life cycle of the fuels, from production to final consumption, is taken into account. La valutazione di studi pubblicati e l'applicazione della metodologia alla produzione di energia elettrica da combustibili fossili, utilizzando dati provenienti da banche dati di letteratura e raccolti dall'industria del gas, dimostrano l'importanza e la difficolta' di avere a disposizione dati affidabili ed aggiornati, necessari per un' analisi significativa del ciclo di vita.

I risultati mostrano che i vantaggi ambientali del gas naturale rispetto agli altri combustibili fossili nella fase di utilizzo finale, aumentano ulteriormente se si considera l'intero ciclo di vita dei diversi combustibili, dalla produzione al consumo finale.

Analisi dei cicli del mercato immobiliare: un applicazione sui dati italiani. Directory of Open Access Journals Sweden. Full Text Available Utilizzando i dati italiani, sulla base dell'approccio teorico del ciclo "a nido d'ape" proposto da Janssen, Kruijt e Needham nel , questo articolo propone un ulteriore contributo allo studio delle dinamiche del mercato immobiliare italiano.

Tecniche di cluster analysis sono utilizzate per raggruppare le regioni che mostrano andamenti simili. Practical aspects of the application of the pinch technology for the reduction of the energy and cooling water consumption in a fertilizer plant; Aspectos practicos de la aplicacion de la tecnologia pinch para la reduccion del consumo de energia y agua de enfriamiento de una planta de fertilizantes.

The application of the pinch analysis to the process revealed the potential saving of existing energy. The need of reducing the incoming raw materials temperature and the operating pressure of two evaporators was identified, for this purpose it was necessary to install three additional heat exchangers.

La aplicacion del analisis Pinch al proceso revelo el potencial de ahorro de energia existente. Se identifico la necesidad de reducir la temperatura de alimentacion de la materia prima y la presion de operacion de dos evaporadores, para lo cual fue necesario implementar tres intercambiadores de calor adicionales. Analisis del rendimiento y consumo de programas orientados al calculo. Pinched Nerve. Within the NINDS research programs, pinched nerves are addressed primarily through studies associated with pain Analysis of the organic horticultural market in Lazio; Analisi della filiera ortofrutticola biologica del Lazio.

Field research was carried out, starting at the end to , on horticultural production, mainly by means a fellowship in agriculture factors that regulate marketing of fresh biological products. Results and conclusion of the study focuses critical steps regulating productions, transformation and distribution of biological agriculture and could be associated to general situation of this sector in Italy.

Moreover attention should be put on the rapid evolution of this sector in the last months, with respect to research time duration, i. Grazie a tale borsa e' stata realizzata, tra la fine del e il , una indagine sulla filiera agroalimentare biologica del Lazio, finalizzata all' analisi dei punti critici che limitavano i segmenti della commercializzazione e della distribuzione del prodotto fresco.

Nella discussione su principali problemi per lo sviluppo dell'agricoltura biologica in Italia, ed in particolare nel Lazio, tra i ricercatori delle strutture sopra menzionate era emersa infatti una carenza di dati sperimentali certi che potessero supportare una serie di considerazioni gia' da noi. Critical analysis of the daylight saving time; Analisis critico al horario del verano.

The critical analysis is presented as a synthesis of the problem untied since the implementation of the daylight saving time. The often related history is retaken to introduce the reader into the context of the causes of a such program.

The geometric aspect of the solar trajectories is discussed and the length of the day as a function of the latitude and the time of the year to have technical elements for the time displacement in a certain region.

The technical implementation of the daylight saving time based on three elements is justified: time of dawn and the decline length of the day , national economic motivation and tourism industry. Stands out that although the daylight saving time schedule has a set of social and economic benefits it is not centered in the individual but in the society as a whole.

The errors in handling the information and the misinformation are pointed out as the main causes of the controversy, the discord and the political manipulation of competing groups.

La historia muchas veces contada se retoma para introducir al lector en el contexto de las causas de un tal programa. Se discute el aspecto geometrico de las trayectorias solares y la longitud del dia como una funcion de la latitud y de la epoca del ano para tener elementos tecnicos para el desplazamiento horario en una region determinada.

Se justifica la implementacion tecnica del horario de verano en funcion de tres elementos: hora de alba y del ocaso longitud del dia , motivacion economica nacional e industria turistica. Se destaca que si bien el horario de verano tiene un conjunto de beneficios sociales y economicos no se centra en el individuo sino en la sociedad en su conjunto. Se senalan los errores de manejo de la informacion y la desinformacion como los principales causantes de la polemica, el desacuerdo y la manipulacion politica de grupos.

Letardi, A. Nella discussione su principali problemi per lo sviluppo dell'agricoltura biologica in Italia, ed in particolare nel Lazio, tra i ricercatori delle strutture sopra menzionate era emersa infatti una carenza di dati sperimentali certi che potessero supportare una serie di. The paper shows the hydrodynamic analysis of the Jaruco-Aguacate aquifer using an unsteady groundwater flow mathematical model. The simulation includes conditions before and after pumping from a well filed, called El Gato, which is considered, as the most important water source for Havana city.

The system is closed to the sea and conformed by an unconfined karstic aquifer with a well defined storage zone; its natural discharge flows through two spring groups. Results obtained with the model for the main spring discharge are near to the measured values, i. Flow is reduced to 2. Besides, a detailed study of the open boundary of the system is done when piezometric head variation in time is known.

The mathematical modelling has been able to simulate the aquifer in its most general conception, in its regional as well as local representation, with a mean deviation of simulated head from observed values less than one meter in both analysed simulated periods.

El acuifero es una llanura carstica cerrada al mar y libre; hacia su centro, la zona de almacenamiento esta bien definida; el sistema de descarga natural realiza por medio de dos grupos de manantiales. L'ampliamento della teoria del linguaggio letterario e l' analisi del fatto letterario.

Analisis del contenido curricular de los Documentos Normativos del Programa de Ciencias en el area de biologia para la escuela superior del sistema de educacion publica de Puerto Rico: Esta investigacion de naturaleza cualitativa se ocupo de realizar un analisis de contenido documental de los Documentos Normativos del Programa de Ciencias en el area de biologia de la escuela superior del sistema de educacion publica de Puerto Rico del periodo El analisis sugiere que no hubo cambios sustanciales en los significados de los Componentes Estructurales.

Los documentos estudiados muestran mayormente caracteristicas similares, aunque los documentos mas recientes eran mas descriptivos, explicativos y especificos. Statistical analysis of the wind around a nuclear power plant; Analisis estadistico del viento alrededor de una central nucleoelectrica.

In order to show an appropriate methodology for the climatic analysis of the wind, some of the recent results in the investigation of the field flow around the Laguna Verde Nuclear Power Station, at Veracruz State Mexico, through the angular correlation coefficients and contingency tables among the registered wind directions by a meteorological tower at the levels of 10 and 60 meters high are presented.

Finally, by applying an objective analysis of the data some conclusions are obtained in connection with the local winds with the mesoscale systems. Finalmente, aplicando analisis objetivo de los datos, se obtienen algunas conclusiones sobre la conexion de los vientos locales con los sistemas de mesoescala. Thermal analysis of the integration of an ammonia plant; Analisis de la integracion termica de una planta de amoniaco.

Arriola Medellin, Alejandro M. Hugo; Alcaraz Calderon, A. E-mail: aarriola iie. In this paper the thermal integration of an existing ammonia plant is evaluated using the Pinch Analysis tools.

It is shown the design criteria that would have to fulfill the heat recovery network to take advantage of process streams thermal potentials. It was identified the heat recovery equipment that induces energy losses by incorrect streams selection, and the economic implications. Se muestran los criterios de diseno que deberian de cumplir las redes de recuperacion de calor, para aprovechar al maximo el potencial termico de las corrientes del proceso.

Tomando como base dichos criterios se analizo el diseno la red de recuperacion de calor de la planta existente, identificando los equipos de recuperacion de calor que generan perdidas de calor por la seleccion incorrecta de las corrientes.

Se estiman las perdidas economicas derivadas del diseno ineficiente de la red. Ad esso e adata la gestione dei job di Produzione, Mer- ge, Ricostruzione degli Eventi e Analisi per i dati sperimentali e simulati.

La volonta di passare ad un motore relazionale e transazionale per la denizione schemi e la possibilita che, in un recente futuro, il DBMS possa rappresentare un serio limite alle prestazioni del sistema stesso hanno reso necessario questo studio. Il lavoro svolto si e concentrato sul proling di un singolo schema relazionale per il quale sono stati utilizzati metodi di analisi e fornite soluzioni ai problemi riscontrati il quanto piu possibile generali e per tanto validi per l'intero sistema.

Analisi matematica. Il presente testo intende essere di supporto ad un secondo insegnamento di Analisi Matematica in quei corsi di studio quali ad esempio Ingegneria, Informatica, Fisica in cui lo strumento matematico parte significativa della formazione dell'allievo.

L'impostazione didattica dell'opera ricalca quella usata nel testo parallelo di Analisi Matematica I. Il testo organizzato su due livelli di lettura. Historical-statistical analysis of energy consumption in energy management; Analisis historico-estadistico del consumo energetico en la administracion de energia. Este estudio es de igual utilidad en un diagnostico energetico, como en un programa gerencial de ahorro de energia.

Sobresalen las ventajas del analisis , y las conclusiones que se pueden derivar del mismo al presentar la posibilidad de identificar probables ahorros de energia. A traves de datos actuales recopilados en varias industrias durante diagnosticos energeticos, se presentan varios posibles resultados del analisis.

Finalmente, se describe como este tipo de analisis puede adaptarse a un control mas preciso de los consumos energeticos, y servir como base para establecer metas de eficiencia energetica a largo plazo. Rotor optimization of a Francis type hydraulic turbine through the computer flow analysis CFD ; Optimizacion del rodete de una turbina hidraulica tipo Francis a traves del analisis computacional del flujo CFD. In the analysis of fluid behavior through hydraulic turbines, two basic methodologies for flow analysis and optimization processes in turbines are used, which are: a modeled of flow through the entire turbine joint , or modeled one of each component separately, obtaining satisfactory results by both methodologies.

The analysis of computational fluids dynamics CFD to geometries improved by means of finite volume method FVM with their corresponding initials and boundary conditions is made, to solve a system differential equations of second order that correspond to the flow around the dominion of runner blades; considering nonviscous flow and the implementation of the two equations models for the solution of the equations that govern the turbulent flow.

Also, used parameterization techniques based in a parametric geometry an objective function and the diminution of cavitation. Francis runner optimization is made, through a previous analysis of CFD by means of the FVM, considering the viscous effects of the fluid and the model of turbulence developed by Sparlart and Allmaras; modeling the wicket and runner separately.

Later the generation of a parametric model of the runner is made and the simulation for the generation of data base is formed. Finally an objective function is considered to develop the optimal geometry of the runner blades. The results are presented in a graphic form in such a way, that it shows the distributions of pressure and speed around the blades runner, the geometrical and performance efficiency and power comparison between original and optimized model.

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