Precision engineering

Xem 1-20 trên 58 kết quả Precision engineering
  • Tham khảo sách 'source: architectural engineering design: mechanical', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • This is an advanced course on modeling, design, integration and best practices for use of machine elements such as bearings, springs, gears, cams and mechanisms. Modeling and analysis of these elements is based upon extensive application of physics, mathematics and core mechanical engineering principles (solid mechanics, fluid mechanics, manufacturing, estimation, computer simulation, etc.).

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  • New approaches to tailor-made cellulose/starch/lignin-synthetic polymer graft copolymers with precise control over molecular weight, degree of substitution, backbone-graft linkage, and the overall grafting process are being studied. Cross-linked graft copolymers with exactly defined polymer chain segments between crosslink points have been prepared. The graft copolymers exhibit a two-phase morphology and can function effectively as compatibilizers/interfacial agents to alloy cellulosic and lignocellulosic materials with synthetic polymers.

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  • Which of the following is the correct expression of the recall ratio and precision ratio used as measures in evaluating information retrieval systems, such as document retrieval systems and data retrieval systems? Here, A, B and C indicate the following.

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  • This guide was created to assist Artists and Engineers, to learn the basics of mesh modelling of non deformable objects with 'Blender'. It uses a structured approach to introducing Blenders tools and work-methods. Following the guide should enable you to become familiar with blender and create models from the simplest of parts to complex accurate engineering assemblies and designs. The guide focuses solely on Blenders Mesh Modelling capabilities, it ignores the myriad of animation,

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  • Chapter 1 - Introduction and basic concepts. This chapter identify the unique vocabulary associated with thermodynamics through the precise definition of basic concepts to form a sound foundation for the development of the scientific principles to follow and to prevent possible misunderstandings.

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  • In this work, the problem of extracting phrase translation is formulated as an information retrieval process implemented with a log-linear model aiming for a balanced precision and recall. We present a generic phrase training algorithm which is parameterized with feature functions and can be optimized jointly with the translation engine to directly maximize the end-to-end system performance. Multiple data-driven feature functions are proposed to capture the quality and confidence of phrases and phrase pairs.

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  • Chapter 1 - Introduction and basic concepts. The objectives of Chapter 1 are to: Identify the unique vocabulary associated with thermodynamics through the precise definition of basic concepts to form a sound foundation for the development of the principles of thermodynamics; review the metric SI and the English unit systems that will be used throughout the text; explain the basic concepts of thermodynamics such as system, state, state postulate, equilibrium, process, and cycle; review concepts of temperature, temperature scales, pressure, and absolute and gage pressure.

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  • What is VHDL? VHDL is the VHSIC Hardware Description Language. VHSIC is an abbreviation for Very High Speed Integrated Circuit. It can describe the behavior and structure of electronic systems, but is particularly suited as a language to describe the structure and behavior of digital electronic hardware designs, such as ASICs and FPGAs as well as conventional digital circuits. VHDL is a notation, and is precisely and completely defined by the Language Reference Manual (LRM).

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  • A control system is a collection of components working together under the direction of some machine intelligence. In most cases, electronic circuits provide the intelligence, and electromechanical components such as sensors and motors provide the interface to the physical world. A good example is the modern automobile. Various sensors supply the on-board computer with information about the engine’s condition. The computer then calculates the precise amount of fuel to be injected into the engine and adjusts the ignition timing. T...

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  • As a "language", these symbols are the most precise means for designers and detailers to place welding, brazing, and nondestructive examination information on drawings AND the most mistake-free means for welding personnel to adhere to original plans.

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  • If cost or design constraints dictate a more integrated package, let our engineering staff help you simplify your design. We offer a full range of manufacturing capabilities from injection molding to CNC machining with the largest selection of engineering plastics to suit your application and specifications.

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  • This book describes high-speed precision motion control technologies which are developed and applied to hard disk drives (HDDs). The first feature of this book is that all the editors and the authors are engineers and professors who are directly engaged in the study and development of HDD servo control. Each author describes the control technologies that he developed, and most of these technologies have already been successfully applied to mass production of HDDs.

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  • Microsoft@ Excel is a ‘number crunching’ application with the accountant as its primary target. However, it also provides the scientist or engineer with a very powerful computational tool. True, there are more sophisticated mathematical applications, such as Mathematica, MathCAD, Maple, etc., but none are as widely available as Microsoft Excel.

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  • Robotics deals with the control of actuators using various types of sensors and control schemes. The availability of precise sensorimotor mappings – able to transform between various involved motor, joint, sensor, and physical spaces – is a crucial issue. These mappings are often highly nonlinear and sometimes hard to derive analytically. Consequently, there

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  • Several new aspects have been highlighted: for example, a novel role for lipids as receptors which drive protein sorting, the diversity of the sorting events that occur at the level of the Golgi apparatus, and the cross talk between exocytosis and autophagy. Moreover, an interesting example of how the knowledge of these pathways is exploited to generate novel secretory routes to direct the synthesis of bio-molecules in “cell factories” is discussed.

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  • The term magnetic bearing refers to devices that provide stable suspension of a rotor. Because of the contact-less motion of the rotor, magnetic bearings offer many advantages for various applications. Commercial applications include compressors, centrifuges, high-speed turbines, energy-storage flywheels, high-precision machine tools, etc. Magnetic bearings are a typical mechatronic product. Thus, a great deal of knowledge is necessary for its design, construction and operation.

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  • CHAPTER 2 9 MEASUREMENTS E. L. Hixson E. A. Ripperger University of Texas Austin, Texas 29.1 STANDARDS AND ACCURACY 29.1.1 Standards 29.1.2 Accuracy and Precision 29. 1 .3 Sensitivity or Resolution 29.1.4 Linearity IMPEDANCE CONCEPTS ERROR ANALYSIS 29.3.1 Introduction 29.3.2 Internal Estimates 917 917 918 918 919 29.4 919 923 923 923 29.3.3 Use of Normal Distribution to Calculate the Probable Error in X 924 29.3.4 External Estimates 925 APPENDIX 29.4.1 Vibration Measurement 29.4.2 Acceleration Measurement 29.4.3 Shock Measurement 29.4.4 Sound Measurement 928 928 928 928 928 29.2 29.

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  • Sophisticated miniaturised components and systems may indeed change all kinds of products and equipment in the most dramatic way. Methodology and design of miniaturisation represent a broad research topic with applications in fundamental physics, chemistry, martial science, computing methods, ultra-precision engineering, fabrication technology, micromachining, and many others based on the principles, characterization, modeling, simulation, sophistication, flexibility of state-of-the-art technology.

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  • Ultra wideband (UWB) radar systems were first developed as a military tool due to their enhanced capability to penetrate through obstacles and ultra high precision ranging at the centimeter level. Recently, UWB technology has been focused on consumer electronics and communications.

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