für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The objective of our study is to look for various mechanisms of tool life in order to understand it and subsequently use them to find out the various parameters of tool wear in rock cutting. This will lead to the development of an understanding of the tool wear parameters which one can control in order to increase the tool life as per the convenience in machining. On the basis of the knowledge-base one has to try to maintain the tool life in order to favorably increase the material removal rate. This book also dealt with the experimental study of dry drilling in basalt and related tool wear. It is found that flank wear, VB, and cutting edge radius, CER, wear rates increase with rock strength, VB-wear rates and CER-wear rates exhibit opposite trends in their dependence on the remainder of the cutting parameters. ····· 1036120520
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The spray droplets were deposited over a rotating copper substrate to achieve a disc shape preform. The thickness uniformity of the preform was found to depend on the preform distance from the nozzle, preform offset distance from the axis of the atomizer and inclination of the preform from the horizontal plane. Mathematical equations were developed to represent the thickness variation of the preform with aforementioned parameters. The porosity, hardness, strength, wear and microstructural studies of the Al-Si-Pb spray deposited alloys were conducted for different lead content, top to bottom distance of the deposit and the distance from centre to periphery of the deposit. Overspray and worn debris particles were also analyzed. Particles/droplets of two different types were observed to deposit on the substrate. First type particles were aluminum rich and second type were lead rich. ····· 1036120502
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Structural materials in many front-line high technology areas have to operate under extreme conditions of temperature, pressure and corrosive environment. So, Materials degradation at high temperatures is a serious problem in several high tech industries. Gas turbines in aircraft, fossil fueled power plants, refineries, and petrochemical industries, and heating elements for high temperature furnaces are some examples where corrosion limits their use or reduces their life, considerably affecting the efficiency. Corrosion causes plant shut downs, waste of valuable resources, loss or contamination of products, reduction in efficiency and costly maintenance in the present work, it was planned to study the behavior of boiler steels subjected to high temperature corrosion in boiler of thermal power plant. Selection of candidate material for the study was made after consultation with Guru Nanak Dev Thermal Plant, Bathinda (India). Thermogravimetric studies were done to understand the corrosion kinetics. Standard techniques such as Scanning Electron Microscope (SEM), Energy Dispersive X Ray Analysis (EDAX) and X Ray Diffractometer (XRD) were used to characterize the corrosion products. ····· 1036120484
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This project reports on the ergonomic design of a bicycle for children considering anthropometric dimensions. To know the customers current needs, a survey was conducted. After it, anthropometric dimensions of target population were gathered in which sample size was kept 90. To make it safer for children, its handlebar is equipped with spring dashpot system so that it will reduce the impact in case of striking the handlebar with abdomen. Statistical tool namely Principal Component Analysis (PCA) has been used in order to identify the predominant parameters in the design. Injuries and other problems faced by children can be minimized by adjusting the bicycle components. If it happens due to physical causes, there are other remedies which have been suggested in the report. Using Newton s laws of motion, average impact force at strike of handlebar with the abdomen has been calculated and using spring design theory, spring parameters have been calculated. The newly designed bicycle was tested to find whether it was better or not. ····· 1036120438
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Corporate firms in both developed and developing countries including Tanzania have adopted Environmental Management System as a strategy for managing the environment when running their operations in a manner that is pro-active, continuous and systematic in nature. Its benefits include optimized product and production process which lead to less material inputs, and lower costs, waste reduction and less adverse environmental impacts. Despite of those benefits the level of awareness and its applicability by corporate firms in Tanzania is scanty and questionable. The study assessed the applicability of the Corporate EMS in Tanzania. It was revealed from the study that the level of awareness of employees on EMS was adequate but the extents of applicability of EMS by corporate firms in Tanzania were limited. Most of the problems were found to be more managerial and financial than technical in nature. The study recommend that the top management should be well committed on EMS, communication between the management and stakeholders in the environmental field, government efforts and resources should be directed to support both private and public firms in order to implement EMS. ····· 1036120385
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book deals with synthesis of ZrB2 powder in the form of whiskers by carbothermal process and nanocrystalline particles by SHS process and study their sintering behaviour and compare the same with commercially available high purity ZrB2 powder. The cyclic oxidation of dense ZrB2 is investigated over the temperature range of 700-1200o C in static air condition. Attempts have also been made to study the production of the ZrB2-Cu composite and evaluate their behaviour as an electrical discharge machining (EDM) cutting tool. The synthesize powder shows better sinterability and oxidation resistance than commercially available powder. The ZrB2-Cu composite shows better performance than copper as a tool material during EDM and finally the EDM debris has been analyzed with different EDM process parameters. ····· 1036120237
····· lezzter Preis 79.00€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Multi criteria group decision making (MCGDM) methods are broadly used in the real-world decision circumstances for homogeneous groups. In this book, heterogeneous group decision making models under fuzzy environment for multi-dimensional personnel evaluation were proposed to compensate the differences of decision makers` knowledge such as: education, expertise, experience and other aspects. A new fuzzy group decision making method was developed under the linguistic framework for heterogeneous group decision making that aims at a desired consensus. Besides, the classical ordinal approach method under a linguistic framework is developed for heterogeneous group decision making, which allows group members to express their fuzzy preferences in linguistic terms for alternative selection and for individual judgments. Furthermore, a fuzzy extension of technique for order preference by similarity to ideal solution (TOPSIS) method under fuzzy environment was proposed. In order to solve the problem of discrepancy between decision making methods` results, a new optimization method was developed, to aggregate the results` of different decision making models. ····· 1036120231
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The applications of robotics in medical field have increased extensively in the last two decades. This work aims at investigating the kinematics and dynamics of six degrees of freedom micro-robot intended for surgery applications. The kinematic equations of motion were obtained using Denavit-Hartemberg representation. The workspace of the robot was investigated based on the kinematic equations as well as the physical limit of each joint. The dynamic equations of motion, which are important for the proper design of robot controller, were first derived using the Lagrangian-Euler technique. Then the required hub torque to move each joint was calculated for the motor selection. The trajectory planning was derived using four different methods of trajectory planning. These methods are the third-order polynomial, fifth-order polynomial, linear segments with parabolic blends and soft motion trajectory planning. A comparison of the results was carried out to choose the best method that gives the smooth set trajectory planning and best performance of the robot under investigation.The simulation results were obtained using MATLAB. ····· 1036120198
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Biomass derived biomaterials or nanobiomaterials are biodegradable, nontoxic, sustainable and substitute for synthetic materials as well as capable to reduce greenhouse gas emission like CO2, CO, SOx, HC and NOx. It is renewable and outstanding energy resource for the creation of steam and electricity, transportation fuel, manufacturing industries. It can be used for biomaterial and nanobiomaterial production as biopolymer or nano-biopolymer (bio-plastic and nano-bioplastic), bone joint gum, nano-gum and bionanoplastic screw for bone joint, nanocatalyst for biofuel, car biobumper and accessories. Fruit and crop waste biomass can be the sources of biomaterial and nanobiomaterial based products like bioplastic and nanobioplastic (nanocellulose fibre, carbon nanotubes, nano-biocellulose film, nanocatalysts for biofuels, bioelectricity) in the agroindustry, pharmaceuticals, biomedical and bioengineering aspect. Nanoscale measurement, sources and production process (basic of blow molding) of nanobioplastic for biomedical, biofuel, car biobumper and accessories from different waste biomass are described. Research based data on nanocatalyst, nanoplastic and nanocompost are presented. ····· 1036120181
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The subject of the study is development of an articulated arm for minimally invasive heart surgery. The fixture develops as a snake-like forearm, carrying a wrist and the pertinent effectors scalpels, scissors, sewing rigs, cameras, etc. The arm is formed by a sequence of modules having the same mechanical interface. About 25 modules have been conceived and their feasibility has been verified. A prototype of the instrument has been machined and tested. The small arm is actuated by 5 micro electric motors: the angular position of each DoF is measured by a magnetic sensor, the clamp is powered by SMA wires. An innovative control algorithm, able to cope with redundancy, has been implemented. The instrument, like a leprechaun, lives inside a box the arm can lean out and move along the programmed path. During the surgery operation, the arm enters in the body of the patient and executes the operation. The robot co-operation will drastically modify surgery practice, giving freedom from anthropocentric bounds the project considers such opportunities, with comments on typical control strategies and hints on actual performance, inferred by testing on virtual reality and digital mock-ups. ····· 1036120151
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The present work investigates the micromechanics approaches to model the thermomechanical behaviours of shape memory alloy composites. The research is primarily focussed on modelling the pseudoelastic and shape memory behaviours of smart composites, which are inherent in multifunctional materials like shape memory alloys and polymers. In the study, non- adaptive and adaptive matrix materials are used to address the adaptive fibre non-adaptive matrix, and adaptive fibre adaptive matrix concepts, respectively. Nickel-Titanium shape memory alloy wire is used as an adaptive shape memory fibre. Similarly, epoxy matrix that does not exhibit shape memory behaviours is considered as non-adaptive, while matrix possessing such behaviours has been employed as an adaptive matrix. The importance of the present research is to develop the modelling procedures for shape memory composites useful in high performance applications. The first and the foremost requirements are to propose the constitutive relations, which should be simpler in computation and at the same time address the fundamental mechanics of constituent materials. ····· 1036120132
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Of all body parts, the head is the most frequent site of life-threatening injury causing not only fatality but also permanent damage in central nervous system (CNS) and subsequent invalidity for the rest of life. Often head injury shows no or little superficial fracture in skull, but results in traumatic brain injury (TBI). In-road traffic accidents account for 40-50% of all head injuries they are also often the cause of the most severe ones. Domestic and industrial accidents cause 20-30%, while most of the rest are caused by sports and recreation (10- 15%) and assaults (10%) [1] Prevention of head injury in traffic accidents, sports ccidents and domestic falls is of great importance in recent times. Number of fatal head injury has been reduced substantially through the introduction of injury protection measures such as helmet, safety belt and airbag. To design safety mechanisms and devices for motorcycle riders one needs a thorough understanding of head injury mechanics which requires knowledge on how external head load is translated into the internal head structures, and beyond what critical load level these structures are damaged under real life crash situations. ····· 1036120125
für 64.71€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The amount of work done in a domain clearly establishes its importance. The composites have attracted the attention of future projects which aim to satisfy their desired role in a much better way. The selection of numerical work for composite processing is aimed to highlight its significance on one hand and on the other hand to demonstrate the capability of developed tools to predict the actual work prior to its execution. The present contribution is an addition to the work done by the predecessors in LaMCoS, INSA de Lyon, France. The author has always been thankful to all who extended their assistance to fulfill the goals of the project. ····· 1036120077
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The ever increasing sophistication of products in technology-driven industries requires that different domains and often distinct units in organizations such as electrical, mechanical and software engineering come together in the product development process. With the advent of commercial PLM systems, it is possible to utilize product development by using the tools as a platform for integrating different engineering applications and managing engineering knowledge in order to make product development more effective and accurate. Setting appropriate authority among users and groups for accessing design documents in addition to defining flow processes are two of the main advantages of implementing PLM. The breakthrough though is the ability to develop modules within the system, using a common programming language such as C, to manage data exchange among engineering tools of different application like CAD/CAM, computation, and simulation, examples of which are CATIA, MATLAB/Simulink, and Minitab to name a few. ····· 1036120041
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In the first part of this work, the impact of gravity on transitional and turbulent jet flames is investigated through Direct and Large Eddy Simulations (LES). It is shown that in the absence of gravity, combustion damps the flow instability hence reduces turbulence production and jet growth. However, in the finite-gravity conditions, combustion generated density variations may promote turbulence and enhance both the mixing and combustion through buoyancy effects. In the second part, the LES/FMDF model is extended towards multi-step chemistry with realistic thermodynamic properties, such that the predictions could be compared with laboratory flame measurements. The consistency of the Eulerian and the Lagrangian solutions are discussed, and an efficient algorithm for parallelization of the hybrid code is presented. Comparisons with the Sandia s piloted methane jet flames (flame D and F) are performed and good agreements in the case of the near-equilibrium flame D have been achieved with a flamelet-based chemistry model, as well as with multi-step kinetics. ····· 1036120035
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Hybrid vehicles have been developed to increase the fuel economy of existing vehicles. A common issue in hybrid vehicles is the additional vibration and vibration-caused noise. This vibration is primarily caused by the switching of power modes, i.e. from the conventional gasoline engine to the electric or hydraulic motor. In certain cases, this vibration, due to the wide frequency range characteristics, cannot effectively be isolated through the use of conventional isolation technologies. In this work, a mixed mode magnetorheological mount has been investigated to mitigate this and similar wide-frequency vibration. A parametric analysis has been performed on one of the main components of the mount, the elastomeric top. Three different parameters were the focus of this investigation. The rubber thickness (by two means) and height were studied. It was found that varying the mount diameter (thickness) is the most influential parameter that was investigated. The initial analyses to validate the finite element model showed at most a ~5% difference. The results of this study will be instrumental for designing and optimizing different mounts. ····· 1036119964
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book is set out to introduce a high precision ceramic fabrication approach suitable for mass production. A group of new processes have been developed and the results are characterized for fabrication of high precision ceramic oxides and composite microcomponents using soft lithography and colloidal powder processing. The book can be divided into four main sections. In the first section fabrication processes high precision hard and soft moulds were studied. In the second section, water, solvent and paraffin wax slurry systems were tested to fill PDMS soft moulds. A comparison study was carried out to choose the best slurry system based on their outputs. In the third section, different ceramic powder sizes of both alumina and zirconia were used in experiments. The work includes detailed characterisation of slurries, green and sintered microcomponents. In the fourth section, the proposed techniques were extended to fabricated homogenous and gradient profiles zirconia/alumina composite microcomponents with tailored properties. ····· 1036119856
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Shape Memory Alloys include a wide range of various materials. These materials exhibit unique properties including thermal (shape memory effect) and mechanical (pseudoelasticity) memory, whereas both these characteristics depend on the martensitic phase transformation and diffusion-free transformation of the solid state. One of the main reasons is their attractiveness due to shape memory and pseudoelastic properties, excellent biocompability and high corrosive resistance. The most attention (even today) goes to Ni-Ti and Ni-Ti-Me systems, where Me represents another alloying element. This book covers mainly Ni-Ti based materials. Alloys from these systems have characteristic features of long-range structure, thermoelastic martensite and crystallographic reversible phase transformations. This book is focused on fabrication, conventional as well as non-conventional forming techniques. Among others there are stated methods for transformation temperatures measurement and evaluation of microstructural characteristic. ····· 1036119811
für 49.41€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Debris accumulation at the spark gap region during Electrical discharge machining and its detrimental effects on the efficiency and overall outcome of the machining process, is a common challenge faced during EDM operations. This has led researchers to investigate and innovate new flushing techniques to solve this problem. This book outlines the effectiveness of the use of magnetic energy in removal of debris from the spark gap and the influence of application of varied levels of magnetic intensity on the various performance parameters of the EDM process. ····· 1036119794
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In past studies, several techniques have been employed to create microscopic features on relatively simple surfaces. Of these, lithography-based techniques have proven effective at manufacturing large fields of deterministic microasperities and microcavities on planar and cylindrical substrates. The present study focuses on adapting UV-lithography to a more complex substrate. Machined from stainless steel, a conical mold insert introduces an interesting geometry designed for the injection molding of radial lip seal elastomer. The distinct shape of this mold insert poises unique challenges to a conventional lithography procedure. Modifications to the process are incorporated into a three-day manufacturing treatment, and results are obtained through optical microscopy and light interferometry. By applying Design of Experiments (DOE) and Analysis of Variance (ANOVA), significant process variables are indentified. Based on these findings, refinements to the process are enabled and future considerations are made evident. ····· 1036119780
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Electrodynamically stabilized levitation for high speed rotors is now reaching the borderline between academic interest and industrial application. Prior results of research on electrodynamic bearings (EDB) for high speed rotors have pointed out their unique characteristic of producing positive stiffness by passive means. Among the most interesting features of electrodynamic bearings is the possibility of obtaining stable levitation using standard conductive materials at room temperature and in absence of control systems, power electronics and sensors. Since stable levitation can be achieved by passive means, electrodynamic bearings are an advantageous alternative to active magnetic suspensions: they are less complex, less subject to failure, and cheaper. Although the working principle of EDBs may seem straightforward, the design of a radial suspension relying exclusively on electrodynamic bearings is a challenging task. The topics ralated to the stability of magetic suspensions based on electrodynamic bearings, their modeling and design represent the focus of the present work. ····· 1036119741
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Fuel cell is an emerging area in the field of renewable alternate energy sources. The operation of a fuel cell involves fluid flow, heat transfer, mass transfer processes and the electrochemical reaction. All the above processes are coupled and they take place in a small region of space making the system complex. The performance of a fuel cell can be studied by experiments and numerical modeling. In the present project, an attempt is made to mathematically model the performance of a Polymer Electrolyte Membrane (PEM) fuel cell using lumped and control volume approach. The various processes that take place inside the gas diffusion layer of anode and cathode, catalyst and membrane of the fuel cell are represented using governing equations based on the mass and energy conservation principles and electrochemical reactions. The equation that is used to represent the diffusion phenomena in the GDL is solved using the Finite Difference Method. The present model is capable of predicting the performance of the PEM fuel cell in close agreement with numerical model based on CFD approach with a maximum of 30% error. ····· 1036119713
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Glass fibre-reinforced polymer have been used as an alternative to steel in concrete due to high strength-to-weight ratio, high stiffness-to-weight ratio, and corrosion and fatigue resistance. The main environmental factors for the deterioration of GFRP sandwich composites are temperature, sunshine, water/moisture, alkalinity and load. In this an experimental investigation has been carried out to study combined effect of chosen parameters moisture and temperature & also to study the rate & magnitude of damage of GFRP sandwich structure composites under hygrothermal loading conditions. The sandwich structure composed of E-glass fibre, polystyrene (thermocol core) and epoxy resin were subjected to three point bending test to assess bending strength. Two thermocol cores with different thickness (8mm and 16mm) were investigated. It has been observed that the sandwich structure with higher core thickness withstand a higher bending load show less flexural stress and flexure modulus when compared with low core thickness. Higher percent bending pre-loads lead to higher degradation in maximum flexure load as well as flexure modulus and flexure stress. ····· 1036119701
für 49.41€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray 1- This study shows the ability to successfully cold-spray 316L stainless steel using nitrogen and helium as a propellant gas. The microstructure was characterized with low porosity and fine grain structure. In addition, after post-processing heat treatment, the microstructure became denser (i.e. lower porosity). The microhardness did not change with 400°C annealing temperature but decreased significantly at 800°C, which can be explained by the recrystallization that occurs during cold-spraying. Both the ductility and strength were improved after annealing at 1100°C, in particular. 2- This study shows the ability to successfully cold-spray composite 316L-CoCr using nitrogen as a propellant gas with Co-Cr volume fractions (i.e. 25%, 33.3%). The deposition efficiency decreased with increasing the amount of Co-Cr. The microstructure is characterized by low porosity level in the first two mixes. At 50% as mixed Co-Cr and 316L, the actual as coated material was 33% Co-Cr, due to difficulties in bonding Co-Cr particles to each other. Thus, the porosity was high at the 50% mixture and cracks were also apparent. ····· 1036119533· 1 · ::::: · 75 ·· 76 ·· 77 ·· 78 ·· 79 ·· 80 ·· 81 · ::::: · 83 ·
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