für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book reviews the subject of Si quantum dots embedded in dielectric andits application to the realization of non volatile semiconductor memories and optoelectronicdevices, this dialing various approaches for the analysis of the materialsthrough transmission electron microscopy (TEM). The advantages coming froman innovative application of energy filtered TEM (EFETM) are put in clear evidence. Themanuscript then focuses on the synthesis of the materials: three different methodologiesfor the realization of the dots based on chemical vapor deposition (CVD)and ion implantation are described in detail, and physical models providing someunderstanding of the observed phenomenology are reported as well. ····· 10361133204
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Generation of large scale power from coal is an economic option. This is specifically true for countries like India having large coal reserves. However, adverse effect on the environment in this process is presently under critical scrutiny. Generating power efficiently from coal in an environmentally benign way is of prime importance. Clean coal technologies are the outcome of this effort. In this work a few advanced clean coal technology based power generation options has been conceptualized. Thermodynamic modeling for these schemes has been developed. Both energy and exergy analyses have been carried out using developed models to estimate the performance of schemes to find optimum solutions, if any ····· 10361132650
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In the diesel engine cylinder, the air fuel mixture is not at rest, but is in highly turbulent condition. The turbulence breaks the filament of a flame into a ragged front, thus presenting a far greater area of surface from which hear is being radiated hence its advance is speeded up enormously. The combustion process may be developed in two stages. One the growth and development of a self-propagating nucleus flame and the other the spread of the flame throughout the combustion chamber. The former is a chemical process depending upon the nature of the fuel, temperature and pressure, the proportion of the exhaust gas and also upon the temperature coefficient of the fuel.During the combustion, there is a rise of temperature and pressure due to the combustion of the fuel ignited. Both temperature and pressure combine to accelerate the velocity of the flame front in compressing the unburnt portion of the charge in the Knocking zone. Ultimately the temperature in this zone reaches such a high value feat chemical reaction proceed, at for grater rather than that at which the flame is advancing. Hence we have combustion accompanied by flame, producing a very high rate of pressure rise res ····· 10361132341
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In enclosed spaces, the combined treatment of the air to control, as specified, temperature, relative humidity, velocity of motion, and radiant heat energy level, with consideration of the need for removal of air-borne particles and contaminant gases.Heating Ventilating and Air conditioning (HVAC) System is capable of providing heating humidification during the winter, cooling and dehumidification during summer, the supply of fresh air through out the year and capability to furnish each of these services in a controlled manner and when sought by building occupants.Plumbing is a system of piping, apparatus, and fixtures for water distribution and waste disposal within a building. This chapter covers the basic water supply and water distribution systems, the theater of operations (TO) water supply and water distribution systems, and the sewerage system. Plumbing also includes the installation and maintenance of these systems. When architects design a building, they prepare a set of prints and a set of specification sheets detailing the types and quality of materials to be used. Plumbers use the prints and specifications to layout and plan the project. ····· 10361132104
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book caters to the needs of the students of undergraduate and postgraduate courses, through effective formulation of mathematical models. This comprehensive text introduces readers to the theory and applications of finite difference technique to arrive at optimal solutions. The neat free-body diagrams are presented and problems are solved systematically to make the procedure clear. It offers finite difference techniques which include Crank-Nicolson implicit finite difference scheme. Each of five chapters includes thorough grounding in the related concepts. In addition, the results and discussions designed to aid further understanding of the subject. ····· 10361119512
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Membrane Separation Technology has added a new dimension in modern separation technology. The recent novel development in membrane processes have made it possible to use various different purposes at eco-nomical rates with additional flexibility and improved efficiencies. Feed spacers can provide higher shear rates at the membrane surface, which, promote the mixing between the bulk of the fluid and the fluid ele-ment adjacent to the membrane surface. As a result concentration polarization and membrane fouling can be reduced. The present work is devoted to investigate the hydrodynamics in two dimensional spacer filled channels. Three different configurations of the cylindrical spacers are investigated with different channel Reynolds number and different meshlength. Different size and shape of formation of recirculation region, upstream and downstream of the spacers are closely observed. This recirculation regions have an important role in enhancing the mass transfer in the reattachment region. ····· 10361119389
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray the simulation of the impact response of viscoelastic bodies is developed by computational finite element model. The variational method is developed to drive the equations of motion. The Lagrange multiplier method is exploited to impose the nonholmonic contact constraints and convert the problem form constraint problem to unconstraint one. The constitutive equations are expressed in integral form and involving relaxation moduli are adopted to describe the nonaging simple material. Generalized Standard Linear Solid (Wiechert) model is adopted to simulate the internal damping (viscoelastic) behavior of the structure is exploited in order to drive a recursive relationship and thereby eliminate storage problem. Newmark constant average acceleration scheme is proposed to integrate the governing equation numerically and transfer the problem into a static one for each time increment ····· 10361118448
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Current research deals with numerical simulation of two-phase turbulent flows (gas and solid particles), which appear in Circulating Fluidized Bed (CFB) boilers, combusting Estonian local fuel - oil-shale. Many thermal processes in industry take advantage of the significant fluid-solid contacting in fluidized beds to carry out fluid-solid reactions, eterogeneous catalysis and particle drying. Gas-solid fluidization process in circulating fluidized beds is widely applied in many industries. The scientific novelty of the thesis is a gas-solid particle turbulent flow numerical simulation, taking in the advance the real initial data of CFB power plants using Estonian oil-shale ash. The results of the simulation describe the behaviour of oil-shale ash particles in CFB, which could be helpful in improving the efficiency of the combustion process. ····· 10361116094
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This work investigates the flow boiling heat transfer in microchannels with the aim of developing compact cooling systems which can be adapted to miniaturized power components. Nano and micro-surface treatments were used as innovative techniques to improve the heat transfer performance as well as to delay the intermittent dryout. Initially,pool-boiling experiments were performed to highlight the impact of nanocoatings on nucleate-boiling mechanisms. It was observed that the surface wettability modified by nanoparticle deposition had significant effects on the boiling processes. Afterwards, a second experimental campaign was conducted to investigate the flow boiling in a microchannel with nanocoated and microstructured samples. These studies highlighted the impacts of surface wettability and of micro-patterning on two-phase flow patterns, pressure drop and heat transfer coefficient. In particular, significant enhancements in heat transfer coefficient and in intermittent dryout were obtained with micro structured samples. ····· 10361116041
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The main objective of the work presented in this book is to improve the control structure for the new Wheelchair Mounted Robotic Arm (WMRA) to include new algorithms for optimized task execution that is, making the WMRA a modular task oriented mobile manipulator. The main criterion to be optimized is the fashion in which the wheelchair approaches a final target as well as the starting and final orientation of the wheelchair. This is a novel approach in non-holonomic wheeled manipulators that will help in autonomously executing complex activities of daily living (ADL) tasks. The WMRA is a 9 DoF system, which provides 3 degrees of kinematic redundancy. A single control structure is used to control the WMRA system, which gives much more flexibility to the system. The combination of mobility and manipulation expands the workspace opening a broad field of applications: from maintenance and storage to rehabilitation robotics. This structure is based on optimization algorithms that can resolve redundancy based on several subtasks: maximizing the manipulability measure, minimizing the joint velocities (hence minimizing the energy), and avoiding joint limits. ····· 10361115626
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Heat exchangers play a vital role in almost all fields of industry ranging from condensers and evaporators in refrigerating units to radiators of automobiles . The strive for obtaining better energy efficiency and cost savings has made the industry to constantly upgrade the technology associated with heat exchangers to improve their heat transfer efficency , reduce the size and also to lower production costs .This has resulted in research into various tube shapes used in heat exchagers including wing-shaped tubes that can improve the heat exchange efficiency .A study was carried out to compare the performance of heat exchangers with staggered banks of tubes with wing-shaped cross sections and cylindrical tubes under turbulent flow conditions. Detailed 2D- numerical simulations of fluid flow and heat transfer were performed for various pitch to diameter ratios using Computational Fluid Dynamics . When compared to the normal cylindrical tubes better heat exchange was observed in wing-shaped tubes which could be due to more attached flow happening in this case due to the wing-shape. ····· 10361115272
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In many cases the decentralisation of the markets lead to an increased price of energy due to a higher number of companies created between the producers and consumers. This phenomenon tends to tighten the competition and increases the pressure on all the market actors. Under these circumstances a simple economical analysis is in many cases unsatisfactory since the competitiveness of one producer on an energy market is also influenced by other factors such as: fuels price variation, tariffs applied by transport operators and energy providers, introduction of eco- taxes, etc. The proposed analysis method is based on a comparison between the analysed cogeneration system and different alternative solutions, in terms of end consumer`s prices. The proposed mathematical model allows the evaluation of the state of the analysed cogeneration system, as well as the effect of several rehabilitation methods. ····· 10361115113
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In this book, an analytical method for on-line determination of absorptance and emittance of materials is discussed. It uses data from sample heating and cooling histories obtained from an absorption calorimeter. The calorimeter is a box chamber having a window, sample holder, tungsten halogen lamp and a microcomputer with instrument interface to control the opening and closing of the shutter window. It is automated with a Z80 microprocessor system that acquires data from the sample through thermocouples, filters, amplifiers and analogue-to-digital converters for temporary storage in an on-board RAM. Analytical solutions of heat balance equations of the calorimeter are computed for the data using numerical methods. Newton`s iteration procedure for systems of nonlinear equations is used with the assumption that the thermophysical properties are constant in the temperature range considered. The IBM PS/2 model 50z microcomputer has been employed to process the data and display the results. The book can be used by students, researchers and workers in various fields to model low temperature thermal processes like in solar Photothermal applications. ····· 10361115040
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book aims to give a clear and coherent understanding of the excitation mechanisms which excite cables in structures. A static and dynamic analysis is undertaken to investigate the behaviour of cables. A comprehensive theory is given for the free, linear vibrations of the suspended cable. Using this theory, a finite element model of several cable-stayed bridges are constructed with various cable configurations in a 2-D and 3-D environment. The effect of increasing the horizontal tension in the cables is analysed and the natural frequencies are compared. Design recommendations and mitigation methods are compared with international building codes. This book provides a extensive introduction into dynamics of cables and a must have guide for bridge engineers. ····· 10361114990
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Province of North Sulawesi in Indonesia is estimated to have geothermal energy as much as 865 MWe. One of the geothermal fields in North Sulawesi is located in Lahendong, which contains potential energy about 530 MW (Pertamina Geothermal Energy 2009). Currently, Lahendong geothermal field is being developed by Pertamina Geothermal Energy (PGE), a subsidiary of PT Pertamina, the state-owned oil and gas company of Indonesia. Two geothermal power stations have been operated with installed capacity of 20 MW each (Unit 1 and Unit 2) in that geothermal field. There is also a 20 MW power station (Unit 3) that has been undergoing operational testing since April 2009. This book assesses the gross electrical power that can be generated from the production wells in the Lahendong geothermal field. ····· 10361114831
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A complete study of heat conducting viscous flows presents several nonlinearities: the convections, the Joule effect and energy dependent conductivity and viscosities. Adopting the general thermodynamics process, the constitutive relations for the Cauchy stress tensor and the heat flux are nonlinear with p and q coercivity parameters, respectively, when non- Newtonian fluids are taken care of. We investigate what we call the (p-q) coupled fluid-energy system. We deal with the initial and boundary value problems of (p-q) coupled fluid-energy systems under Dirichlet-Newton boundary conditions as well as nonstandard boundary conditions capturing the frictional phenomena and convective/radiative heat transfer behavior on a part of the boundary. The resolution of the proposed coupled systems employs several distinct methods of nonlinear functional analysis: classical theory on calculus of variations duality theory on convex analysis Faedo- Galerkin method Moreau-Yosida regularization argument compactness and monotonicity methods L1- theory on PDE due to the existence of the Joule effect and fixed point arguments for multivalued mappings. ····· 10361114396
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The mechanical transduction gain of nanoelectromechanical systems (NEMS) has been thoroughly studied, but the drive power has always been a priori limited to the onset of non-linearities. Besides, the smaller the structures, the sooner non-linearities occur, reducing their dynamic range and even making extremely difficult to detect their oscillation. In this thesis, this limitation is reconsidered, i.e. the non-linear dynamics of M&NEMS sensors is investigated. Several analytical design rules are provided in order to enhance the dynamic range of nanoresonators and the detection limit of NEMS-based resonant sensors. These rules essentially include hysteresis suppression by non-linearity cancellation as well as mixed behavior and pull-in retarding under superharmonic resonance and simultaneous resonances leading to the possibility of driving the resonator linearly at high oscillations compared to the critical amplitude. The experimental validation of the model has been performed in the case of resonant capacitive MEMS and M&NEMS accelerometers and gyroscopes as well as capacitive and piezoresistive gas/mass sensors. ····· 10361113911
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The improvement of the cast part quality, both as far as the geometric precision and mechanical properties are concerned, is an important desiderate for researchers. There is a twofold aim: on the one hand, the reduction of the costs related to the cast part mechanical machining (in order to do this, the dimensional errors of the cast parts should be reduced to diminish the machining allowance with the machining processes) and, on the other hand, a high level of the cast part strength during functioning, by obtaining a proper crystalline structure during melt material solidification/cooling. This domain mainly refers to the relation between the melt material solidification/cooling process and the cast part dimensions and crystalline microstructure. The present approach of the domain has two aspects: on the one hand, the modeling of the melt material solidification/cooling process in order to establish and programme the optimal thermal field dynamics and, on the other hand, the control of the thermal field evolution depending on its programmed dynamics. ····· 10361113907
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The concept of friction in general, and the problem of stick-slip motion in particular, at microscopic length scales, are central to many areas, from friction and lubrication of materials to earthquake models and avalanches. The interest in this problem comes from the large range of physical applications that are related to it: computer disk, miniature motors, and many aerospace components. This book, therefore, provides a study of friction and stick-slip phenomena in some nonlinear models that contain nonlinear spring and deformable nonsinusoidal substrate potential, such as Remoissenet-Peyrard potential. We also provide a quite thorough description of the feature of the mechanism of frictional phenomena. We show that the critical velocities which provide the transition between stick-slip, intermittent and sliding motions depend on the shape of the contact surfaces, as well as the nonlinear parameter of the spring. This shape also affects the static friction. This analysis should help in dealing with complex situations and stimulate further experimental studies of friction and stick-slip phenomena in the deformable systems. ····· 10361113863
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Modern alloys appear and develop as complex multi- component systems with the aim of accomplishing demands of metallurgical engineering, material science and industry. Nowadays, many commercial software systems can be found in the market to perform complicated calculations, in order to obtain thermodynamic properties of materials. This work reviews the algorithms, procedures, formulations and calculations behind the most common approach used in computational thermochemistry, CALPHAD (CALculation of PHAse Diagrams). ····· 10361113584
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book offers an analytical review of thermodynamic processes through EES (Engineering Equation Solver). The aim is to facilitate the study of the principles of thermodynamics, in a gradual and progressive manner. As the resolution of certain problems calls for a numerical solution, EES software simplifies the calculation procedure. The book is organized into 6 chapters. The first chapter is a review of the basic thermodynamic concepts, laws and equations. The second deals with steam/vapour cycles and the third with gas cycles. The fourth chapter concerns exergetic (or second law) analysis of different processes and cycles. The fifth chapter deals with psychrometrics and moist air. The sixth and final chapter presents applications related to refrigeration technology. Throughout the second to the sixth chapter, several examples are shown, solved with EES and commented. ····· 10361113237
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray FLOW PROBLEMS WITH HEAT AND MASS TRANSFER. In this Dissertation, investigations are carried out on Natural convection flow of fluid between two infinite vertical parallel plates for different physical situations as well as different fluid properties. The different thermal conditions considered in this dissertation include symmetric and asymmetric heating of the boundaries, periodic temperature variation on the boundaries, viscous dissipation heating as well as the role of Non- Fourier energy equation on convective heat transfer. The dissertation also investigated the influence of heat generation or absorption and mass leakage (suction/injection) through the channel boundaries. Closed form solutions are obtained for momentum, energy and concentration equations for different physical situations. It is hoped that the result presented in this dissertation will be of use in validating Computer routines for numerical solutions of more complex natural convection fluid flows in the presence of heat and mass transfer and in stimulating needed experimental work in this area. ····· 10361113143
für 26.80€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Infrarot-Thermografie ist ein Baustein aus dem Werkzeugkasten der zerstörungsfreien Werkstoffprüfung. Die berührungslose bildgebende Temperaturmessmethode ermöglicht die zuverlässige Ortung und Quantifizierung thermischer Auffälligkeiten eines Meßobjekts. Der besondere Vorteil ist dabei, daß dies bei laufendem Betrieb einer Anlage passieren kann. Die IR-Thermografie ist somit eine unverzichtbare Inspektionshilfe und leistet einen wichtigen Beitrag zur Früherkennung von Schäden.Voraussetzung ist allerdings eine professionelle Beherrschung der Technik. Die physikalischen Grundlagen stammen dabei von den Physikern Herschel, Planck, Stefan, Boltzmann und Wien. Ihre Entdeckungen und Gesetze ermöglichen es, die thermischen Eigenschaften eines Körpers, der eine über dem absoluten Nullpunkt (-273 °C) liegende Temperatur hat, sichtbar zu machen. Im Unterschied zu anderen bildgebenden Verfahren (z.B. Röntgen- oder Ultraschall) können allerdings mit der in diesem Buch beschriebenen passiven Thermografie nur Oberflächeneigenschaften (Temperaturen) detektiert werden. Zum Inhalt des Buches gehört deshalb auch eine Besprechung einiger grundlegender Begriffe der Thermodynamik. Um die Funktionsweise einer Thermokamera zu verstehen, ist aber ebenso ein Ausflug in die Optik nötig. Der größte Teil widmet sich der speziellen Gerätetechnik einer IR-Kamera. Was hat es mit dem Emissionsgrad auf sich Was ist eine Umgebungsstrahlungstemperatur Welchen Einfluß haben Level und Span auf die Aussage eines Thermogrammes Sehe ich einen wirklichen `hotspot` oder nur die reflektierte Temperatur eines Körpers Was sollte ein korrekter Bericht enthalten, den Sie ihrem Auftraggeber überreichen Ein Hinweis auf die in Deutschland verfügbare Literatur und die wichtigsten Vorschriften zum Schluß. ····· 10361107469
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This thesis is devoted to the creation of a rheometer based on the boundary value problem of the two eccentric cylinders. This device is the first one after the cone-and-plate rheometer which is able to determine more material constants other than the viscosity. However, the eccentric cylinder rheometer shows to be one of the future instruments which is capable to further developments without the difficulties due to the effect of inertia encountered in the cone-and-plate rheometer. The preliminary results obtained by this apparatus proved to be sufficient for the determination of the viscosity coefficient and the second order coefficient over a range of shearing which overcomes the range covered by the cone-and-plate. Further investigation are required which is expected to allow the determination of other material constants. The theoretical basis of the present problem is discussed in details [1, 2], where the fluid performs rotational and axial motions. In the present thesis the rotational part of the motion is considered and the stream function for this motion is determined. ····· 10361102774· 1 ·· 2 ·· 3 ·· 4 ·
Affiliate Marketing
AdHoc MeldungenAffiliate & PublisherAdvertiser & MerchantAcademyAntwortenArtikelsucheAdventskalender
AffilitivProduktdatenPreisvergleich
