Sommer karsten (45 risultati)

Gebundene Ausgabe. Condizione: Sehr gut. Gebraucht - Sehr gut SG - leichte Beschädigungen oder Verschmutzungen, ungelesenes Mängelexemplar, gestempelt - Die Vermarktung der griechischen Unterwelt erweist sich als sehr schwieriges Projekt. Eine Stadt, in der Hunde nicht erwünscht sind, birgt eine Überraschung. Und ein harmloses Interview mit einer alten Dame gerät zu einem Fiasko.Ein Schoßhund als Zerberus. Eine finstere Höhle, in der etwas lauert. Ein Einhorn in psychologischer Behandlung. Eine gefährliche Mission im afrikanischen Regenwald. Götter und Menschen, Monster und Lichtgestalten, Vergangenheit und Gegenwart. 25 Geschichten, von Heldenepos bis Humor, quer durch die Mythologien der Menschheit.…

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Condizione: New. In English.

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Condizione: As New. Unread book in perfect condition.

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Gebunden. Condizione: New.

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Paperback. Condizione: Brand New. 2010 edition. 250 pages. 9.25x6.10x0.50 inches. In Stock.

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Paperback. Condizione: Like New. LIKE NEW. SHIPS FROM MULTIPLE LOCATIONS. book.

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Condizione: New. pp. 212.

Buch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Die Versauerung von Böden ist eines der zentralen Themen einer an Nachhaltigkeit orientierten Umwelt- und Wirtschaftspolitik. Wirksame Umweltentlastungen können hier nur durch Maßnahmen in so unterschiedlichen Bereichen wie Energiewirtschaft, Verkehr und Landwirtschaft erzielt werden. Das Buch bietet neben einer detaillierten Analyse von Emissionsverlauf und -struktur der wichtigsten Schadstoffe zunächst einen umfangreichen Überblick zu den notwendigen Emissionsminderungen. Anschließend werden die bisher in Deutschland sowie auf internationaler Ebene ergriffenen politischen Instrumente zur Emissionsminderung versauernd wirkender Substanzen im Detail analysiert, wobei Effekte bei der Emissionsminderung gleichberechtigt neben ökonomischen, sozialen und rechtlichen Aspekten stehen.…

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Hardback. Condizione: New.

Paperback. Condizione: Like New. LIKE NEW. SHIPS FROM MULTIPLE LOCATIONS. book.

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Hardcover/Pappeinband. Condizione: Gut. 192 Seiten. Mit Abb. Umwelt, Umweltpolitik Bibl.-Ex., Sehr guter Zustand. gebraucht; gut Bibl.-Ex., Sehr guter Zustand. ha1065599 Sprache: Deutsch Gewicht in Gramm: 420.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Inhaltsangabe:Introduction:The process of aluminium production is, even nearly 150 years after its discovery, not totally understood. Such a large quantity of factors influences the production process that no standard can be applied on it. In an aluminium reduction plant there are no two identical electrolysis cells. Differences in the start-up and operational disturbances alter the thermal and electrical behaviour of each cell individually. So every cell has to be monitored individually through the continuous changing bath composition and temperature variation. Every cell needs an individual dynamic optimisation of the chemical and thermal input, e.g. the AlF3- and CaF2-addition and the regulation of the anode-cathode distance. Self-regulating mechanism are the melting and freezing of the sidewall ledge, external mechanisms the lifting and lowering of the anodes.In this work a cell control system at Alumar (Brazil) was analysed and improved. The focus laid on controlling the cell temperature through a variation of the anode-cathode distance. The main objective was to analyse the effect and influence of a so-called temperature resistance modifier on hot pots (electrolysis cells).When the temperature of an electrolysis cell exceeds a certain limit, the pot operates outside its optimal working conditions, thus it has to be cooled down. This can happen by reducing the anode-cathode distance and therefore the resistance of the pot. The reduction is controlled by the so-called temperature resistance modifier. The concept of the temperature modifier was introduced less than one year ago at Alumar and is also within the Alcoa group a quite unexplored field.This work is structured in two parts, first an introduction to theory, then the practical part. Chapter 2 gives some general information, from the history of aluminium to a brief overview over the entire production process. Chapter 3 focuses on the general functioning of the aluminium electrolysis. Chapter 4 details the properties of the cryolite bath in the reduction cell and their impacts on the pot operating characteristics.Chapter 5 contains the experimental part of the work. In a first time the quality of the measurement system was tested. Then the relations between temperature resistance modifier and time as well as two bath parameters, the temperature and the ratio were inquired. Thereafter substantial modifications on the program that calculates the temperature modifier were analysed [¿] 116 pp. Englisch.…