This study investigates the characteristic behavior of disturbances on the interface of a needle crystal, Ivantsove parabola, based on an asymptotic analysis as well as a numerical study. Focusing on tip growth and width behavior, we examine anisotropy in surface energy, initial strength of the disturbances. It is found that the characteristics of a tip growth depends on the distance away from dendrite tip. The constant wave-length, o, suggests that the possiblity of the existence of an attractor in o. An evolution of finger competition between two disturbances with different initial strengths is investigated to understand the selection mechanism. Данное издание не является оригинальным. Книга...
ISBN: 978-3-8433-5844-6
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Книга по требованию
Дата выхода: июль 2011
An einer behandlungsbedurftigen Depression, einer der haufigsten und hinsichtlich ihrer Schwere am meisten unterschatzten Erkrankungen, leiden ca. 5 % der Bevolkerung. Schatzungen der WHO gehen davon aus, dass schwere depressive Erkrankungen bis zum Jahre 2020 den zweiten Rang in der Reihenfolge der Erkrankungen einnehmen werden, die die Hauptursache fur verlorene Lebensjahre durch schwerwiegende Behinderung oder Tod sind. Die Autorin gibt einfuhrend einen Uberblick uber die Symptome der Depression, kognitive Defizite depressiv Erkrankter sowie die verschiedenen Theorien zur Atiologie der Depression. Ausgangsproblem der im Anschluss dargestellten Untersuchung war die Tatsache, dass bisherige Studien sehr heterogene Patientengruppen...
ISBN: 978-3-8364-9035-1
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Книга по требованию
Дата выхода: июль 2011
Die Intelligenz eines Kindes wird durch weit mehr Lebensbedingungen beeinflusst, als man auf den ersten Blick meinen konnte. Denn das Gehirn und die Intelligenz eines Kindes entwickeln sich schon pranatal und wir uben Einfluss auf sie aus, auch mit der Wahl der Geburtsform. Das Ziel dieser Studie war die Klarung des Einflusses der Sectio Caesarea (Kaiserschnitt) sowie weiterer fruhkindlicher Faktoren auf die Intelligenz von Kindern im Volksschulalter. Hierzu wurden im Grossraum Graz 118 Kinder hinsichtlich ihrer Intelligenz getestet. Die Einflussfaktoren wurden mittels Elternfragebogen erhoben, die statistische Auswertung mittels Korrelation und Pfadanalyse durchgefuhrt. Als wichtigste Einflussfaktoren stellten sich das Geburtsgewicht...
ISBN: 978-3-6392-7842-2
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Книга по требованию
Дата выхода: июль 2011
Dieses Buch bietet Personen aus der Branche, sowie auch praxisfremden Personen verstandliche und interessante Einblicke in die Materie der Einzelfertiger. Der Autor hat jahrelange Erfahrung von der Basis bis ins oberste Management und kann hautnah wiedergeben, wie ein Unternehmen in dieser Sparte funktioniert. Er versucht im Zuge seiner Literatur den Formen- und Werkzeugbau lebendig darzustellen, untermauert mit Statistiken und Bildern. Von der Entwicklung uber interne Ablaufe bis hin zu neuersten Innovationen. Schlagworte wie Benchmarking, BDE, HSC,... werden hier erortert. Anhand eines aktuellen Beispiels eines Betriebes aus Mitteleuropa der sich national und international einen Namen gemacht hat, und sich so zum Weltmarktfuhrer...
ISBN: 978-3-6390-6361-5
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Книга по требованию
Дата выхода: июль 2011
In fast allen Autoprospekten wird der Kraftstoffverbrauch nach Europaischer Norm angegeben. Im Rahmen einer Diplomarbeit wurden Messsysteme zu Erfassung von Geschwindigkeit und Kraftstoffverbrauch in ein Fahrzeug integriert. Mit Hilfe dieser Systeme wurden verschiedene Aspekte Untersucht. So wurde Uberpruft: In wie weit entspricht der Europaische Testzyklus der Realitat? Wie genau sind die Verbrauchsangaben des Herstellers? Welche grossen beeinflussen den Kraftstoffverbrauch am Meisten? Der Einbau der Messsystme, die Messfahrten und deren Auswertung sind Inhalt dieses Buches. Zielgruppe des Buches sind Studenten und alle die Interesse an Technik haben. Данное издание не является оригинальным....
ISBN: 978-3-6390-2517-0
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Книга по требованию
Дата выхода: июль 2011
Aufgrund der standig steigenden Komplexitat von Verbrennungsmotoren und dem dadurch bedingten, hoheren Entwicklungsaufwand werden am Motorprufstand verstarkt automatisierte Testlaufe eingesetzt. Der Autor Andreas Rainer erlautert die dabei auftretenden Schwierigkeiten anhand eines praktischen Beispiels und stellt eine Simulationsumgebung vor, mit deren Hilfe die Effizienz der Testlaufparametrierung und damit der Kostenvorteil beim Einsatz von Automatiklaufen deutlich gesteigert werden kann. Der Aufbau der Simulationsumgebung beinhaltet die notwendigen Prufstandskomponenten um moglichst realitatsnahe Reaktionen hervorzurufen. Der Prufling und die Messgerate werden durch ein Modell ersetzt, das in einer hybriden Struktur aufgebaut ist und...
ISBN: 978-3-6390-5993-9
Издательство:
Книга по требованию
Дата выхода: июль 2011
Antenna reconfigurability has attracted great interest in the last years in view of the performance gains it brings about with respect to "static" structures. The benefits are particularly interesting for nowadays compact antennas, as these are subject to conflicting requirements mostly dictated by commercial aspects: increasing device functionality while decreasing volume occupation. This work presents a methodology for the design of compact reconfigurable antennas based on the coupling of engineering expertise with efficient full-wave simulation and automated optimization. The first part provides background material including previous work and description of the relevant computational tools. The second part describes the overall design...
ISBN: 978-3-8383-6341-7
Издательство:
Книга по требованию
Дата выхода: июль 2011
Unmanned Grass Cutter The traditional ways of grass cutting for wider fields using manually operated machines requires full time highly skilled labor. Furthermore, there can be labor-imposed constraints which limits the use of these machines in hot sun or heavy down-pour. Therefore, a common tractor which normally used for grass cutting has been modified to be a semi automatic grass cutter. This machine requires no operator during the entire grass cutting operation, except for initiating and stopping the machine at initial and eventual stages. The spiral way of grass cutting can be tuned to be double cutting so that the machine cuts the grass twice for better trimming of the grass height. A simple mechanism is attached to the modified...
ISBN: 978-3-8433-5267-3
Издательство:
Книга по требованию
Дата выхода: июль 2011
The Kingdom of Jordan is the 10th water poorest country in the world and the 4th water poorest country in the Middle East. The natural water resources of the country are not sufficient to meet the demands of the population and because of the water rationing that has been in place since the 1980's. Currently, the economically viable harnessing of surface water has been maximized, groundwater is being pumped at 160% of the sustainable yield.Jordanian scientists in partnership with international organizations have determined that desalination of saline water will play the most important role in alleviating the country's water scarcity problems. This document will outline a design work for a desalination system using a slow sand filter as a...
ISBN: 978-3-8433-5590-2
Издательство:
Книга по требованию
Дата выхода: июль 2011
The objective of this research was to design, develop and investigate the performance of a solar-biomass hybrid air heating system to supply hot air at a specific temperature and flow rate for a daily load fraction exceeding 90%. The system consists of an unglazed transpired solar collector (UTC), a rock bed thermal storage, and a biomass gasifier stove with heat exchanger. From a review of literature, an air heating system, aimed at reducing the weather dependency and improving the temperature and flow rate stability without a conventional back-up heater, was designed. Based on analysis of various types of solar collectors, thermal storage, biomass stoves and heat exchangers that are commonly used, individual components of the air...
ISBN: 978-3-6392-2225-8
Издательство:
Книга по требованию
Дата выхода: июль 2011
Petroleum refinery is an industrial process plant where crude oil is processed and refined into more useful petroleum products, such as gasoline, diesel fuel, asphalt base, heating oil, kerosene, and liquefied petroleum gas, it consist of several units which have great importance such as Heat exchanger trains, Pre flash tower, Crude distillation tower and Vacuum distillation.It is important to size and design distillation tower properly and expertly to get desire products of petroleum with their required specifications. This report work is divided in to seven chapters. First three chapters discuss about introduction, history and main process which are carried out in refinery. Chapter four discuss important factors which have sound impact...
ISBN: 978-3-6392-7487-5
Издательство:
Книга по требованию
Дата выхода: июль 2011
The present book is a result of the research activity aimed at developing a new measuring system for large scale dimensional metrology - the MScMS (Mobile Spatial coordinate Measuring System). In this field, the rising exigency of measuring quickly and with acceptable accuracy levels has promoted significant advances across the development of light and scalable technologies, which are easy to implement and flexible in their use. MScMS consists of multiple components with small dimensions connected by a wireless network and arranged around the measuring area, so as to allow rapid dimensional measurements to be performed in relation to large-size objects. This system, which was developed at Politecnico di Torino (Italy), is portable,...
ISBN: 978-3-6392-2498-6
Издательство:
Книга по требованию
Дата выхода: июль 2011
Mustafa Resit Haboglu, Kerem Emrah Erkut, Suat Ensari
This is a Graduation Project by Mustafa Resit Haboglu and his colleagues Kerem Emrah Erkut and Suat Ensari who all graduated from Sabanci University (Istanbul/Turkey) in the Spring of 2009. The project suggests an improved design for a previously designed pool cleaning robot. The mechanical design contains the dimensions of the structure, properties of its inner components such as vacuum pumps, motor etc. and the optimisation of the assembly of those components. Electrical design contains the controlling of the robot and remote controller. Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения...
ISBN: 978-3-8433-8420-9
Издательство:
Книга по требованию
Дата выхода: июль 2011
The real human arm is a complex kinematics system. It works according to instructions calculated by a highly accurate method, and has a moving system working by deity manner. The design and simulation analysis of arm moving system model with 7-Degree of Freedom (DOF) are presented. The electromyography (EMG) signal is the activation signal for muscles in human arm and accordingly the arm will have a certain movement. The arm dynamic system in real environment simulation was implemented using the inverse kinematics problem (IKP) analytical solution. The computation time of this simulation is very fast and has the ability to include any real constrain. The finite recurrent back propagation neural network ( FRBP-NN ) is used with the...
ISBN: 978-3-8433-7973-1
Издательство:
Книга по требованию
Дата выхода: июль 2011
The present book is written for those researchers who are interested in designing a low-cost, low- power Wireless Sensor Network (WSN). In this book, design and development of a low cost WSN node using MSP430 microcontroller and nRF24L01 radio transceiver has been given in detail. A new adaptive power algorithm has been developed, which further reduces the power consumption of this node. The evaluation of WSN node has been done for various tests including routing algorithms, packet loss measurement, receiver sensitivity and calculation of free space loss. A case study of Car Parking Management System has been described as a practical application of WSN. The developed WSN has potential applications in the fields of military surveillance,...
ISBN: 978-3-6392-6519-4
Издательство:
Книга по требованию
Дата выхода: июль 2011
In recent years the pressure pulse decay technique became a frequent tool for fast and convenient measurement of permeability of tight rocks. The method is superior to conventional steady state method as it is much faster and easier to perform. Few authors considered measurement of matrix and fracture permeabilities by using this technique. In this study a mathematical model for solving the problem of transverse, unsteady compressible fluid flow through fractured whole core was developed. Experimental setup has been constructed to perform pressure pulse decay experiments on whole cores. Based on the developed numerical solution, a data analysis computer program has also been developed which calculates the matrix and fracture...
ISBN: 978-3-6392-5462-4
Издательство:
Книга по требованию
Дата выхода: июль 2011
This book appeals to an audience in the engineering field specifically Mechanical Engineering. Professional design engineers will find this work useful in the estimation of the magnitudes of residual stresses in components and correctly account for them when determining factors of safety. Destructive and non-destructive technicians will find it helpful in the condition monitoring of plant and equipment while a basis for researchers is laid to pursue further work.The book focuses on the measurements of displacements, time of flight/ultrasonic velocity and strains in steel specimens which subsequently prompts the calculation of stresses. The following methods are covered; Hole Drilling, Ultrasonic (Debro-30) System and Digital...
ISBN: 978-3-8433-8454-4
Издательство:
Книга по требованию
Дата выхода: июль 2011
Cementing is an extremely important part of completing an oil and gas well. Based on quality and type of cement used, factors such as the future exploitation of the well and its ability to withstand changes in temperature and pressure are evaluated. The important mechanical properties such as Young's modulus, Poisson's ratio, bulk modulus, shear modulus and constrained modulus are discussed in this thesis. Static and Dynamic testing are two methods to measure the mechanical properties of cement slurries. These tests are important in predicting the quality and integrity of the cement sheath during the life of the well. In general, the thesis describes the static and dynamic models used to calculate parameters and analyze results obtained...
ISBN: 978-3-6391-4279-2
Издательство:
Книга по требованию
Дата выхода: июль 2011