He directions

Xem 1-20 trên 207 kết quả He directions
  • Giới thiệu chương Các hệ thống thông tin quang được ứng dụng có hiệu quả nhất trong lĩnh vực truyền dẫn số. Do vậy trong tính toán, thiết kế ta xem xét hệ thống truyền dẫn số IM-DD (Intensity Modulation-Direct Detection) thì những điều kiện bắt buộc về kỹ thuật và tính kinh tế đóng một vai trò quan trong trong tất cả các tuyến thông tin sợi quang.

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  • GDI là từ viết tắt của cụm từ Gasonline direct injection chỉ các loại động cơ phun xăng trực tiếp. Trong loại động cơ này, xăng được phun thẳng vào buồng cháy của các xi-lanh, khác hẳn nguyên lý phun xăng vào đường nạp của các động cơ phun xăng điện tử thông dụng.

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  • Trong hộp thoại Coordinate System Definition bạn tiến hành khai báo như sau: - Nhấp chuột vào cartesian - Trong mục vào giá trị sau: + X direction : 1 + Y direction: 1

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  • Model Outline Engine Chassis Engine Chassis Body Body Electrical Steering EPS (Electric Power Steering) – Motor drives the rack directly Resolver Type R l T Torque Sensors [Specifications] Type Gear R ti (O G Ratio (Overall) ll) No. of Turns Lock to Lock Rack Stroke [mm in.

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  • Thông qua DDC (Direct Digital Controller) cùng với phần mềm và thiết bị quản lý điều khiển, Hệ thống BMS (Building Management System) của Hãng Johnson Controls sẽ điều khiển và giám sát.Hệ thống BMS sẽ nhận biết tình trạng và điều khiển các hệ thống khác theo sự cài đặt của người sử dụng.

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  • Radio Transmission Systems Mamoru Sawahashi 2.1 Direct Sequence Code Division Multiple Access (DS-CDMA) 2.1.1 Principles of DS-CDMA DS-CDMA is a radio-access technology that enables multiple access based on a spread spectrum system. Figure 2.1a shows how DS-CDMA works [1–3]. The transmitted data sequence is spread across the spectrum after being encoded by spreading codes, each of which is assigned uniquely to each user at a higher rate than the symbol rate of the information data.

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  • Radar and Sensor Systems Radar stands for radio detection and ranging. It operates by radiating electromagnetic waves and detecting the echo returned from the targets. The nature of an echo signal provides information about the target—range, direction, and velocity. Although radar cannot reorganize the color of the object and resolve the detailed features of the target like the human eye, it can see through darkness, fog and rain, and over a much longer range.

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  • Other Wireless Systems The two major applications of RF and microwave technologies are in communications and radar=sensor systems. Radar and communication systems have been discussed in Chapters 7 and 8, respectively. There are many other applications such as navigation and global positioning systems, automobile and highway applications, direct broadcast systems, remote sensing, RF identi®cation, surveillance systems, industrial sensors, heating, environmental, and medical applications. Some of these systems will be discussed brie¯y in this chapter....

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  • 7 Forming Processes: Monitoring and Control 7.1 7.2 Introduction: Process and Control Objectives Process Control Issues • The Process: Material Diagram • The Machine Control Diagram The Plant or Load: Forming Physics Mechanics of Deformation: Machine Load Dynamics • Mechanics of Forming: Bending, Stretching, and Springback 7.3 7.4 7.5 David E. Hardt Massachusetts Institute of Technology Machine Control Sensors Machine Control: Force or Displacement? Process Resolution Issues: Limits to Process Control Process Resolution Enhancement 7.6 7.

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  • 24 Intelligent Soft-Computing Techniques in Robotics 24.1 24.2 Introduction Connectionist Approach in Robotics Basic Concepts • Connectionist Models with Applications in Robotics • Learning Principles and Rules 24.3 Neural Network Issues in Robotics Kinematic Robot Learning by Neural Networks • Dynamic Robot Learning at the Executive Control Level • Sensor-Based Robot Learning 24.4 Dustic M.

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  • 6 Process Monitoring and Control of Machining Operations 6.1 6.2 6.3 Robert G. Landers University of Missouri at Rolla Introduction Force/Torque/Power Generation Cutting Force Models • Force/Torque/Power Monitoring • Force/Torque/Power Control Forced Vibrations and Regenerative Chatter Regenerative Chatter Detection • Regenerative Chatter Suppression 6.4 6.5 6.6 Tool Condition Monitoring and Control Tool Failure • Tool Wear A. Galip Ulsoy University of Michigan Other Process Phenomena Burr Formation • Chip Formation • Cutting Temperature Generation Richard J.

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  • The correctness of many systems and devices in our modern society depends not only on the effects or results they produce but also on the time at which these results are produced. These real-time systems range from the anti-lock braking controller in automobiles to the vital-sign monitor in hospital intensive-care units.

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  • 10 Precision Manufacturing 10.1 10.2 10.3 Deterministic Theory Applied to Machine Tools Basic Definitions Motion Rigid Body Motion and Kinematic Errors • Sensitive Directions • Amplification of Angular Errors, The Abbe Principle 10.4 10.

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  • NETWORKED SYSTEMS RELIABILITY Many physical problems (e.g., computer networks, piping systems, and power grids) can be modeled by a network. In the context of this chapter, the word network means a physical problem that can be modeled as a mathematical graph composed of nodes and links (directed or undirected) where the branches have associated physical parameters such as flow per minute, bandwidth, or megawatts. In many such systems, the physical problem has sources and sinks or inputs and outputs, and the proper operation is based on connection between inputs and outputs....

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  • 14 Active Vibration Absorption and Delayed Feedback Tuning 14.1 14.2 Nejat Olgac University of Connecticut Introduction Delayed Resonator Dynamic Absorbers The Delayed Resonator Dynamic Absorber with Acceleration Feedback • Automatic Tuning Algorithm for the Delayed Resonator Absorber • The Centrifugal Delayed Resonator Torsional Vibration Absorber Martin Hosek University of Connecticut 14.3 Multiple Frequency ATVA and Its Stability Synopsis • Stability Analysis; Directional Stability Chart Method • Optimum ATVA for Wide-Band Applications 14.

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  • IV Robotics Miomir Vukobratovi´ c 451 © 2002 by CRC Press LLC 19 Robot Kinematics 19.1 19.2 19.3 19.4 19.5 19.6 19.

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  • 20 Robot Dynamics 20.1 20.2 Fundamentals of Robot Dynamic Modeling Basic Ideas • Robot Geometry • Equations of Dynamics Recursive Formulation of Robot Dynamics Velocities and Accelerations of Robot Links • Elimination of Reactions — Minimization of Dynamic Model Form • Calculation of Direct and Inverse Dynamics 20.3 20.4 20.

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  • Trong một số các tài liệu, danh từ hệ thống (system) được định nghĩa là tập hợp hay sắp xếp kết nối có trật tự các phần tử vật lý theo một thể.Danh từ điều khiển (control) thường mang ý nghĩa là điều chỉnh (regulate), hướng đến nhắm đến (direct) và thực thi tác vụ hay một lệnh (command).

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  • MC-CDMA and MC-DS-CDMA In this chapter, the different concepts of the combination of multi-carrier transmission with spread spectrum, namely MC-CDMA and MC-DS-CDMA are analyzed. Several single-user and multiuser detection strategies and their performance in terms of BER and spectral efficiency in a mobile communications system are examined. 2.1 MC-CDMA 2.1.1 Signal Structure The basic MC-CDMA signal is generated by a serial concatenation of classical DSCDMA and OFDM. Each chip of the direct sequence spread data symbol is mapped onto a different sub-carrier.

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  • In the previous chapter we explained_how to develop stable direct adaptive controllers of the form u = .F(z, O), where .F is an approximator and 8 E RP is a vector of adjustable parameters. The approximator may be defined using knowledge of the system dynamics or using a generic universal approximator. We found that as long as there exists a parameter set for the approximator such that an appropriate static stabilizing controller may be represented, then the parameters of the approximator may be adjusted on-line to achieve stability using either the a-modification or the e-modification.

    pdf42p tienvovan 16-09-2010 37 5   Download

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