für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book aims at providing an overview of the phenomena of friction in mechanical design. Starting from a research history on this topic, which was crucial since the ancient Egyptians, we pass through the presentation of the first theories proposed by Leonardo da Vinci to reach, the admirable work of Coulomb, the description of some recent mechanical applications in which the precise and accurate knowledge of the coefficients of friction is essential for their correct use and design. Based on the presented investigations some valid methods are proposed in order to measure accurately the coefficients of friction to be used in modern applications such as, for example, the threaded connections and the press-fitted joints mainly applied to front motorbike suspension. ····· 10361119479
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The objectives and scope of the investigation has been mentioned. It is stated that the main objective of present study is to investigate the EL of ROPPV films.ROPPV is semiconducting conjugated polymer semiconducting conjugated polymer.The study has been made by intersect that following point: (I) Preparation of thin film and thickness measurement(II)Absorption study of ROPPV polymer,(III) Photo lumenescence studies of 2-5-dialoxy -poly-P-vinelene(ROPPV) Films,(IV)Preparation of EL cells(V) Theoretical studies of EL in thin films. Several intense EL materials have been prepared, Whose EL emission can be seen in the ultraviolet region. An attempt has been to correlated results obtained from the EL & PL studies of ROPPV polymer films. The thickness dependance optical property of ROPPV films is summarized. The theoretical approach is made to the solids comparison made between the theoretical and experimental results The conclusions drawn from the present investigation are summarized and the perspectives for the future research on ROPPV thin films have been given. ····· 10361119354
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The work presents the investigation in the response of plate-shell structures subjected to impact loading (gas mixture explosions). This phenomenon is studied in the context of its mechanical aspects, mainly the ductile fracture prediction. The work starts with the literature review and the description of theories, which are nowadays the most popular in the damage and failure modelling. After selecting the theoretical models and the numerical tools for the further analysis, the detailed report of all realised experimental tests and their results is presented. Then, for the assumed constitutive and damage laws, the identification of material and fracture criteria parameters is realised. Finally, the numerical simulations are performed and their results, verified by the experiments, are summarised and commented. The work finishes with the conclusions, where the best approaches (from those, which have been tested) are pointed, all assumptions or limitations used in the study are discussed and the objectives for the further research are indicated. ····· 10361118977
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Hi this is Kranthi Sale, Completed my Bachelors(2004-2008) & Masters(2008-2010) from `ALI YAVAR JUNG NATIONAL INSTITUTE FOR THE HEARING HANDICAPPED`. I Worked as a Audiologist and Clinical Specialist in Shravya Speech and Hearing center,Hyderabad and at present I am working in AYJNIHH,SRC as a Speech Pathologist.This book is based on the original work done by me in my Masters. It explores the utility of GAP detection test in Cochlear Implant Recipients.The work shows that there is frequency specific difference in responses of individuals with Cochlear Implants.This marked difference at low frequency is observed because the auditory filter seems to play a role in determining the form of the results for the standard-and reversed phase conditions, Gap thresholds estimated from the preserved-phase condition do not show a strong effect of center frequency, except at very low frequency (200 Hz below). I acknowledge Dr.S.G.R.Prakash and Mr.B.Shiva Prasad for their immense support. ····· 10361118718
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The current work focuses into two main directions ofrotor dynamics object: the simulation ofa rotor-bearing system and the detection of defectsthat are commonly appeared in rotating systems. Thetransverse breathing crack in a rotor and the radialyextended wear in a bearing are the defects presentedin the simulations. The persuasion is initialy tomake a proposal in rotor-bearing system nonlinearsimulation and secondly to suggest methods able todetect the transverse breathing rotor crack and thebearing wear. Time-frequency analysis is performedusing continuous wavelet transform in numerical andexperimental time histories in order to extract thevariable coupling phenomenon exclusively due to thebreathing crack from the other two main reasons ofcoupling, the bearings and the shaft. The mainspeculations are that both defects have to bedetected in an early growth and without the demand ofinterrupting the operation of the system since thiscannot be always feasible in real rotating machinery.The growths of the defects have to be at least of 10%of rotor radius for the crack, and 20% of bearingradial clearance for bearing wear. ····· 10361118471
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray During the conceptual design stage of a trackedmobile robot, the designerwishes to verify the robot s mobility andmanipulation capabilities. Multi-body dynamicssimulation-based virtual prototyping process can beused in theconceptual design stage and can significantly reducethe amount of physicaltesting required at various design stages, andassociated cost. The application ofthis process for tracked mobile robots has beendeveloped and is shown here. Asa test case, it was initially applied to an existingrobot and was validated with testresults. Later it was applied to a new robot whilestill in its conceptual designstage. Multi-body dynamic models of the robots weregenerated and simulationsrelated to mobility and manipulation tasks wereperformed. The usefulness of thesimulation results to verify and improve the robotdesign was demonstrated. Theabove established process can now be applied to newrobot designs, during itsconceptual design stage. ····· 10361117924
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Para determinar la durabilidad o vida útil de las construcciones de hormigón es necesario conocer la calidad y el estado de deterioro de los materiales cementicios. A nivel práctico, la caracterización más utilizada es la extracción de probetas o testigos y su análisis posterior en laboratorio. Sin embargo, la utilización de técnicas de evaluación no destructiva (END) presenta grandes ventajas sobre las técnicas habituales como poder conocer el estado de toda la estructura y permitir la monitorización en continuo de la misma. Entre los métodos de END, los ultrasonidos han demostrado su versatilidad para la caracterización de estos materiales tanto a nivel práctico como de investigación. El presente trabajo busca ahondar en el conocimiento de la interacción que se produce entre las señales ultrasónicas que se propagan a través de este tipo de materiales y su microestructura para poder determinar tanto la calidad como su estado. Para ello se aborda el efecto de la dispersión de las ondas ultrasónicas cuando se transmiten a través de los materiales cementicios, para establecer métodos y técnicas que permitan la caracterización de sus parámetros microestructurales. ····· 10361116811
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Las Iglesias Gótico-Mudéjares han sido identificadas como el tipo parroquial sevillano. Aspectos como la transmisión oral y musical son habituales en este tipo de recintos, si bien es verdad que tradicionalmente estos han sido relegados a un papel secundario. Este hecho, por fortuna, ha cambiado drásticamente en las últimas décadas. El presente libro describe el comportamiento acústico de doce iglesias de la ciudad de Sevilla. A partir de las medidas experimentales llevadas a cabo, se ha propuesto un modelo descriptor de la energía acústica, que sirve no solamente para esta tipología sino para cualquier otra. Es, por tanto, un modelo general que puede describir la energía acústica de cualquier espacio. Pretendemos con este trabajo aportar a los profesionales de la Arquitectura y de la Acústica Arquitectónica un mayor conocimiento sobre el comportamiento de este tipo de espacios y las herramientas adecuadas para que al acometer proyectos de conservación y/o rehabilitación de los mismos pueda ampliarse el concepto de patrimonio arquitectónico para considerar bajo tal denominación no sólo los aspectos formales y visuales sino también los aspectos sonoros. ····· 10361116390
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Recently, Hybrid Evolutionary Algorithms (EAs) has become a popular tool for optimization. This book presents the established fundamentals in the area of GAs and vibration control as well as explores new and emerging technologies and techniques. The first part of the book presents novel optimization techniques by combining GAs with local search method which is called hybrid GAs. The second part focuses on application of the proposed hybrid GAs to the design of the suspension parameters of the half car model in order to enhance ride comfort and road holding performances. Different dynamical models of the half car are constructed and incorporated under different situations and assumptions. New mathematical models of road bumps are developed using Fourier series to induce excitation to the vehicle. New optimization problems that help in controlling vehicle vibration are discussed. This book will be useful to researchers and students in the field of automotive engineering, computer science, operations research, management science and applied mathematics. The readers will learn numerous new modeling ideas and effective algorithms, and find this work a stimulating and useful reference. ····· 10361116196
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The study of convection heat and mass transfer in a non-Newtonian fluid saturated porous medium has attracted many investigators due to its wide range of applications in geophysics and energy related problems. The effects like stratification, melting, double dispersion, dissipation, variable viscosity and radiation are important phenomena, understanding the effect of these on coupled convection in porous media is very important. In the existing literature, most of the researchers considered the porous media saturated with Newtonian fluid while studying aforesaid second order effects. This motivates to elaborate these second order effects in non- Newtonian fluid saturated non-Darcy porous media. This book aims at theoretical investigation of some of the above second order effects on natural and mixed convection heat transfer or coupled heat and mass transfer process by considering porous media saturated with non-Newtonian fluids. In each case, the non-dimensional governing equations are solved numerically by similarity and local non-similarity methods wherever applicable. ····· 10361115488
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Numerical and analytical investigations of transport processes in composite domains (macro and micro) exist in many practical applications. These applications include biological, geophysical and many others. The book presents studies on numerical and analytical solutions for the flows formation inside the horizontal macro and micro parallel-plate channel partially filled with a uniform porous material in the presence of suction/injection. An attempt is also made to present analytical solution for the fluid flow using Brinkman-Darcy-extended-Forchheimer model in the porous region and compared with the traditional numerical method. The Approximate analytical solutions presented for both horizontal and composite channels can be efficiently used to solve nonlinear differential equation models arising from Brinkman Forchheimer extended fluid flows. ····· 10361113970
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Whenever two bodies are in rubbing contact, macroscopic phenomena as friction, adhesion and wear are inevitably experienced. The practice of controlling such phenomena has been part of the technique and technology development during all the human evolution stages. However, despite of the longstanding practical approach to the problem, the methodological investigation is instead much more recent. Actually, the investigation of friction, adhesion and wear is carried out as a part of a wider research activity involving physics, chemistry, material science and engineering. In this book we review specific aspects of the lubrication fundamentals and dry contact mechanics, with particular emphasis on the theoretical investigation of the role of fluid rheology and surfaces roughness on the contact mechanics at dry/lubricated interfaces. ····· 10361113638
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The study of the non-linear system is usually avoided in the engineering literature because of the mathematical complications which appear in this situation. The author introduces the concept of neo-Hookean element, that is a non-linear elastic element for which the elastic force depends on the elongation both linear and at a negative integer power. These elements are then used in different mechanical systems from the most simple to very complicated. For each system are obtained the non-linear differential equations of motion, are studied the stabilities and are made comparisons between different cases of non-linearity and between the neo-Hookean case and the linear one. Keeping into account the non-linearity, the equilibrium position is not unique and in this book the reader can find a complete study of the equilibriums. Since the force depends on a negative integer power of the elongation the study must be separately made for positive and negative elongations. Some unusual behaviors very often met in practice are easily explained using the neo-Hookean elements. ····· 10361112947
für 39.80€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Die mathematische Modellierung von technischen Systemen setzt die Entwicklung von multiparametrischen Modellen und die Anwendung von leistungsfähigen Computersystemen voraus. In diesem Werk werden Modelle entwickelt, die als Grundlage für die hydrostatischen Berechnungen von meerestechnischen Systemen und Schiffen angewendet werden können. Hydrostatische Belastungen auf befestigten Körpern werden in der technischen Strömungsmechanik untersucht mit dem Ziel, Stabilität und Festigkeit von wasserbautechnischen Systemen zu untersuchen. Dazu gehören Berechnungen von Off-Shore-Anlagen, Schleusensystemen, Wasserkraftwerken, Hochwasserschutzanlagen. Hydrostatische Modellierungen von schwimmenden Körpern werden hauptsächlich in der Schiffstheorie durchgeführt. Es gibt eine Reihe von Problemen in der Schiffstheorie, bei deren Lösungen bestimmte hydrostatische Berechnungen notwendig sind. Diese Probleme sind: Schwimmfähigkeit und -Stabilität von Schiffen, hydrostatische Belastung auf Druckkörper von Unterseebooten, Ab- und Auftauchbedingungen von Unterseebooten und Arbeitsschiffen - Halbtaucher, Sicherheit von Schiffen (Leck- und Kenterstabilität), Verhaltensweise von havarierten Schiffen, Bergung von Schiffen vom Meeresboden. Eine besondere Rolle spielt in diesem Spektrum von Aufgaben das Problem der stabilen Schwimmfähigkeit eines Körpers im Wasser. Die klassische Stabilitätstheorie ist auf der Basis von hydrostatischen Reaktion gegründet. D.h. es werden Verdrängung, Metahöhe und Metaradius des Schiffes bestimmt, und auf dieser Basis wird eine Stabilitätsbedingung formuliert. In diesem Werk wird eine Methode entwickelt, die eine bestimmte Verallgemeinerung von klassischer Technik darstellt. Die Methode gilt sowohl für schwimmende (auf der Wasseroberfläche) als auch für schwebende (unter der Wasseroberfläche) Körper. Die Verallgemeinerung der klassischen Methode wurde in zwei Richtungen vorgenommen. Die erste Richtung: Der Körper wird als mehrfach zusammenhängendes Gebilde dargestellt. Es wird eine multikomponente Darstellung vom Körper bezüglich Dichte eingeführt, d.h. der schwimmende Körper wird in seine Bestandteile (z.B. Stahlkonstruktion, Ladung, Luftraum, Ballastwasser) zerlegt. Auf dieser Basis wird eine multiparametrische Darstellung vom Körper-Wasser-System in Matrizenform eingeführt. Die Grundlage dieser Darstellung bilden Vermessungs-, Massen- und Verdrängungsmatrix. Diese 6×6 Matrizen enthalten geometrische, mechanische und hydrostatische Momente vom Körper. Sie beschreiben bestimmte Integralwerte (Funktionale) vom Körper-Wasser- System: Skalar-, Vektor- und Tensormoment. Grundlage für diese Integralwerte bilden entsprechende Volumen-, Dichten- und Verdrängungsverteilungsfunktionen. Die Schwimmmatrix wird als Kombination von o.g. Matrizen konstruiert. Sie beschreibt das Maß von Schwimmfähigkeit und -Stabilität des Körpers in Form von Volumenverhältnissen zwischen Körperbestandteilen. Die Schwimmmatrix lässt ihre Vektor- und Tensorkomponenten zu anderen Koordinatensystemen umformen. Damit entsteht die Möglichkeit, die Schwimmfähigkeit und -Stabilität vom Körper in Abhängigkeit von allen denkbaren Variationen von geometrischen und mechanischen Parametern zu untersuchen. Die zweite Richtung: Die Anfangsstabilität eines schwimmenden (bzw schwebenden) Körpers wird als Stabilität des Gleichgewichtszustandes definiert. Es wird das Gleichgewichtszustand des Körpers im Wasser analysiert. Das hydrostatische Kraftsystem eines Körpers (H-Kraftsystem) wurde eingeführt, das eine Kombination von Auftriebskräften und zusammenpressenden Belastungen darstellt. Das H-Kraftsystem bildet ein vollständiges System von Vektoren, das den Gleichgewichtszustand des Körpers beschreiben lässt. Das H-Kraftsystem wird mit einer Matrix (H - Matrix) erfasst, die drei Kräfte und drei Drehmomente beinhaltet. Die Komponenten der H-Matrix (H-Funktionale) hängen von mehreren Umständen ab: der geometrischen Form des Körpers, der Tauchtiefe, der Orientierung des Körpers bezüglich der Wasseroberfläche (bzw Schwerkraftrichtung). Sie können mittels Oberflächenintegrale beschrieben werden. Eine H-Matrix beschreibt eindeutig das hydrostatische Kraftsystem des Körpers und sie bildet eine Grundlage für Berechnung von stabilisierenden Drehmomenten des Gleichgewichtszustandes. Es wurde eine Methode zur Berechnung von H-Funktionalen für verschiedene Körper entwickelt die Momentenmethode bildet die Grundlage dieser Berechnungstechnik. Die Bestimmung von Funktionalen wird zur Berechnung von Raummomenten erster Ordnung des Halb - Körpers und Flächenmomenten zweiter Ordnung von bestimmten Schnittflächen des Körpers reduziert. Die zahlreichen Ergebnisse für H-Funktionale wurden für geometrische und schiffsähnliche Körper unter- und auf Wasseroberfläche präsentiert. Auf dieser Grundlage wurden die aufrichtenden Drehmomente bezüglich Krängung und Trimm konstruiert. Sie bestimmen das Maß von Stabilität des Körpers bezüglich der äußeren Einwirkungen. Es wurden Schwimmfähigkeit und Stabilität von schwebenden und schwimmenden Körpern (mit geometrischen und schiffsähnlichen Oberflächen) berechnet. Die hydrostatischen Berechnungen von Schiffen wurden durchgeführt für: Konventionelles Schiff, Unterseeboot, Arbeitsschiff. Das Werk gliedert sich in die Abschnitte: Grundlagen, Wasser-Körper-System, H- Kraftsystem, Schwimmfähigkeit und -Stabilität von Körpern, Hydrostatische Berechnungen von Schiffen, Appendix. ····· 10361108454
für 45.80€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Currently, hydrophones are routinely used in ultrasound measurements in water. In spite of their high measurement accuracy and the possibility of measuring high frequency ultrasound (e.g., f = 20 MHz), hydrophones always suffer from the sound diffraction induced by the immersed hydrophone itself as well as the dependency of the output response on the angle of incidence. Since the discovery of acousto-optic interaction, optical techniques are expected to achieve accurate ultrasound measurements and avoid these two limitations, because light can retrieve information about ultrasound without material contact. Light refractive tomography (LRT), which utilizes laser light to detect ultrasound pressure in fluids, has long been underestimated as a simplification of another optical technique, light diffraction tomography (LDT). After a thorough review of published research, it appears that LRT is so far the sole technique, which is noninvasive, omnidirectional and provides time-resolved results scaled in Pa. In the process of developing LRT into a reliable and useful ultrasound measurement technique, achievements have been made in four different aspects: - Accuracy: With the aid of numerical simulations, potential systematic errors are quantitatively analyzed. The subsequent development of simple and effective methods ensures that critical error sources have small influences on results (typically 1MPa) arising from an ultrasound device driven by compressed air. Finally, the conclusion is drawn and some further research possibilities are suggested. ····· 10361108094
für 39.80€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In dieser Arbeit werden mit optisch gefangenen Nanopartikeln Schallquellen auf der Mikroskala geortet und mit einer bislang auf dieser Längenskala unerreichten Empfindlichkeit spektroskopiert. Weiterhin wird erstmalig von der plasmonischen Kopplung von Nanopartikeln in einer dreidimensionalen optischen Falle berichtet und die Auswirkung der Kopplung auf die Stabilität der Falle untersucht. So genannte optische Pinzetten finden seit Jahrzehnten unter Anderem in der Laserkühlung, der Erzeugung von Bose-Einstein-Kondensaten und der Spektroskopie breite Anwendung. Mit ihnen können Objekte kontaktlos über lange Zeit immobilisiert werden. Daher sind sie auch für die Raman-Spektroskopie interessant, in der kleine Streuquerschnitte von Molekülen lange Integrationszeiten bedingen. Eine bekannte Methode, diese Aufnahmezeiten durch Nutzung der lokalen Feldüberhöhung in plasmonisch aktiven Systemen zu verkürzen (SERS), konnte aber bislang nicht in optischen Pinzetten umgesetzt werden. Im ersten Teil dieser Arbeit wird erstmals plasmonisches Koppeln optisch dreidimensional gefangener Silber-Nanopartikel beobachtet. Die Kopplung verstärkt sich mit der Zeit, bis Teilchen aus der Falle freigesetzt werden. Dieser Zusammenbruch der Falle wird mit Modellrechnungen untersucht. Dabei werden je in Abhängigkeit des Partikelabstands die Tiefe des Fallenpotentials und die Aufheizung des umgebenden Wassers durch plasmonisches Heizen untersucht. Thermophoretische Kräfte durch eine starke Temperaturzunahme um die Partikel herum können als Ursache für den Zusammenbruch der optischen Falle identifiziert werden. Bei genauer Kontrolle des Partikelabstands ist plasmonische Kopplung als Grundvoraussetzung für SERS damit in optischen Fallen prinzipiell möglich. Im zweiten Teil dieser Arbeit wird die Beobachtung der Dynamik optisch gefangener Gold-Nanopartikel genutzt, um akustische Spektroskopie auf der Mikroskala zu betreiben. Makroskopische Schallquellen können durch eine Veränderung der ansonsten durch Brownsche Bewegung dominierten Dynamik einfach identifiziert werden. Als mikroskopische Schallquellen kommen plasmonisch geheizte Aggregate von Gold-Nanopartikeln zum Einsatz. Sie verändern die Dynamik der beobachteten gefangenen Partikel im Zeitraum nicht signifikant. Erst Analysen im Frequenzraum können mikroskopische Schallquellen eindeutig nachweisen. Dabei kann die Schallquelle nicht nur spektroskopiert werden, auch ihre Richtung lässt sich bestimmen. Die messbare Schallleistung liegt in den durchgeführten Versuchen bei LW = -58 dB. Die dem detektierenden Partikel dabei zugeführte Energie liegt mit Ekin ~ 90 µeV bei nur etwa 0, 1% seiner thermischen Energie. Dank dieser neuartigen Technik können bislang nicht zugängliche Vorgänge in lebenden oder künstlichen Mikro- oder Nanosystemen mit einer unerreicht hohen Empfindlichkeit akustisch spektroskopiert werden. ····· 10361107430
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In a 2005 article in Science, Park et al. measured in vacuum the friction between a coated atomic-force- microscope tip and the clean two-fold surface of an AlNiCo quasicrystal. Because the two-fold surface is periodic in one direction and aperiodic (with a quasiperiodicity related to the Fibonacci sequence) in the perpendicular direction, frictional anisotropy is not unexpected however, the magnitude of that anisotropy in the Park experiment, a factor of eight, is unprecedented. By eliminating chemistry as a variable, the experiment also demonstrated that the low friction of quasicrystals must be tied in some way to their quasiperiodicity. Through various models, we investigate generic geometric mechanisms that might give rise to this anisotropy. ····· 10361103021
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Organisational learning is of great importance for an organisation that is in constant competition with its rivals. It is regarded as a multi-dimensional process, involving the acquisition,sharing and use of knowledge. This study compares organisational learning in two different conditions: in organisations that implemented Quality Management and earned an IS0 9000 certification, and in organisations that did not implement Quality Management.This study also discusses the relationship between organisational learning and quality management. The variables explored in this study are: the learning environment, identifying learning and development needs, meeting learning and development needs, and applying learning in the workplace. This study evaluates the effect of quality management on organisational learning by using the variables listed above. Information was gathered from employees of some Iranian companies.These companies are located in Tehran, the capital city of Iran, and have been selected randomly as samples in this study. The study was performed using a sample of 90 firms (57 with ISO certification and 33 without ISO certification). ····· 10361102384
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Osteoarthritis is a disease that has been characterised historically by the focal destruction of cartilaginous tissue and hence, is defined as such. However, recent investigations have brought this pathology into contention with significant evidence implicating subchondral bone in the disease`s pathophysiology. Early-stage primary osteoarthritic bone samples were harvested from both presenting medial and and non-presenting lateral compartments of diseased human tibia and were used to investigate the role of subchondral bone in the pathogenesis of primary human osteoarthritis. Significant differences in intrinsic tissue stiffness and mineralisation were observed in all samples presenting with clinically-defined, early-stage OA. Interstingly, non-presenting lateral samples also exhibited significant differences in stiffness and mineralisation. Hence, the presence of an early, non-presenting stage of OA initiation was observed in the bone tissue of these samples prior to overlying cartilaginous tissue damage. In conclusion, the classic `wear` and `tear` definition of this disease is no longer applicable to human knee OA. ····· 10361101924
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The main objective of the topology optimization is to fulfill the objective function with the minimum amount of material. This reduces the overall cost of the structure and at the same time reduces the assembly, manufacturing and maintenance costs because of the reduced number of parts in the final structure. The concept of reliability analysis can be incorporated into the deterministic topology optimization method this incorporated scheme is referred to as Reliability-based Topology Optimization (RBTO). This book explores a reliability-based synthesis method which estimates all the statistical parameters and finds the optimum while being less computationally intensive. The efficiency of the proposed method is achieved with the combination of topology optimization and stochastic approximation which utilizes a sampling technique such as Latin Hypercube Sampling (LHS) and metamodeling techniques such as Local Regression and Classification using Artificial Neural Networks (ANN). ····· 10361101664
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Weight reduction is important in the automotive industry. To achieve this, Tailor Welded Blanks (TWB`s) are used: body panels consisting of sheets with different thicknesses and/or materials, welded together and stamped into the desired shape. Aluminium TWB`s have been introduced only recently. Laser welding is a joining technique that shows high potential to produce the required strong yet deformable welds. In this work various aspects of the laser welding of these thin aluminium sheets are treated, like the development of a control system to ensure full penetration keyhole welding and a camera based monitoring system that allows coaxial in-situ process monitoring. Furthermore several models are presented which help to gain a better understanding the welding behavior. Finally five different laser based welding techniques are compared, among which laser welding with cold wire feeding, twin spot laser welding and laser/GMA hybrid welding. ····· 10361101660
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The book deals with the design and developmental aspects of an embedded based system for the measurement of dielectric constant in liquids and solids. A dielectric is a substance that can sustain an electric field and acts as an insulator. Some liquids and gases can serve as good dielectric materials, having a special property of storing and dissipating electrical energy when subjected to electromagnetic fields. Dry air is an excellent dielectric. The dielectric data are required on a large variety of materials under different physical conditions for many industrial, scientific and medical applications of microwave energy. The embedded based measurement system, designed and developed in the present book, is quite successful in measuring the dielectric constant of liquids and solids with reasonable accuracy and its application for investigation/measurement of chemical, fibers, glass, oil, ceramics and other fields is found to be very useful. ····· 10361101565
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The role of twinning in the anisotropic behavior and ductility of magnesium alloys is analyzed at ambient as well as elevated temperatures. Magnesium alloy AZ31B sheet is investigated as a model system, because it is the most common wrought magnesium alloy. Uniaxial compression tests are conducted at room temperature and at elevated temperatures to measure the anisotropy of the strength and strain at various strain levels.A viscoplastic self-consistent polycrystal modeling approach was used to model the deformation behavior including the anisotropy and texture evolution. Temperature dependence of parameters affecting activity of different deformation modes, such as Critical Resolved Shear Stress (CRSS) and strain hardening, and the volume fraction of twinned grains are investigated with the help of the polycrystal plasticity model.The model, thus developed, could find application for predicting material`s response in complex loading conditions. ····· 10361101305
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray `If the world is meaningless that prevents invent any sense `-Lewis Carroll Alice`s Adventures in Wonderland . About 50 years ago importance to apply differential geometry for extending the elastic continuous medium model was recognized by researchers. The introduced affine-metric objects characterize the internal geometric structure of the continuous media and its difference from the Euclidean geometry. The affine- metric objects are the internal variables, and they can`t be measured directly. This book shows how to establish the relation between the non-Euclidean geometric parameters of description and experimentally measured characteristics. It is demonstrated on the basis of the non-equilibrium thermodynamics formalism that to determine the affine-metric characteristics it is experimentally sufficient to measure two independent functions: internal energy and dissipation function. The proposed approach allows us to construct a thermomechanical model of a continuous medium including a full set of non-Euclidean characteristics which corresponds, from the physical point of view, to the description of dislocations, disclinations and point defects. ····· 10361101110· 1 ·· 2 ·· 3 ·· 4 ·· 5 ·
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