# Phase systems

Xem 1-20 trên 245 kết quả Phase systems
• ### Báo cáo hóa học: " Research Article Blind Deconvolution in Nonminimum Phase Systems Using Cascade Structure"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Blind Deconvolution in Nonminimum Phase Systems Using Cascade Structure

• ### PSAT Power System Analysis

Power flow solutions are needed in both for planning and operation studies. Power flow studies for three phases balanced power system can be carried out using very efficient methods. Power flow analysis for certain type of power system network can be carried on by using several software that already been develop without manual calculation on this time. One of the software is MATLAB with its toolbox: Power System Analysis Toolbox. This software also uses numerical methods to do power flow analysis like Newton-Raphson and its modified form, Fast Decoupled Method.

• ### HVAC Systems Design Handbook part 3

All solutions to engineering problems start with a calculation or estimation of the duty which must be met (i.e., quantifying the problem). The purpose of heating and cooling load calculations, then, is to quantify the heating and/or cooling loads in the space(s) to be conditioned. Rough estimates of load may be made during the concept design phase.

• ### Vector Control of Three-Phase AC Machines

From the principles of electrical engineering it is known that the 3-phase quantities of the 3-phase AC machines can be summarized to complex vectors. These vectors can be represented in Cartesian coordinate systems, which are particularly chosen to suitable render the physical relations of the machines. These are the field-orientated coordinate system for the 3- phase AC drive technology or the grid voltage orientated coordinate system for generator systems.

• ### HARMONICS AND POWER SYSTEMS by Taylor & Francis Group

In a normal alternating current power system, the voltage varies sinusoidally at a specific frequency, usually 50 or 60 hertz. When a linear electrical load is connected to the system, it draws a sinusoidal current at the same frequency as the voltage (though usually not in phase with the voltage). When a non-linear load, such as a rectifier, is connected to the system, it draws a current that is not necessarily sinusoidal. The current waveform can become quite complex, depending on the type of load and its interaction with other components of the system.

• ### GLOBAL NAVIGATION SATELLITE SYSTEMS – SIGNAL, THEORY AND APPLICATIONS

Global Navigation Satellite System (GNSS) plays a key role in high precision navigation, positioning, timing, and scientific questions related to precise positioning. This is a highly precise, continuous, all-weather, and real-time technique. The book is devoted to presenting recent results and developments in GNSS theory, system, signal, receiver, method, and errors sources, such as multipath effects and atmospheric delays

• ### Evaluation of U.S. Air Force Preacquisition Technology Development

The enactment of the Weapon Systems Acquisition Reform Act of 2009 (Public Law 111-23) and the recent revision of Department of Defense Instruction 5000.02 have served to highlight the complexity of the Department of Defense acquisition process.1 This report serves as a follow-on study to the 2008 National Research Council (NRC) report Pre-Milestone A and Early-Phase Systems Engineering: A Retrospective Review and Benefits for Future Air Force Systems Acquisition, which emphasized the role of systems engineering in the acquisition life cycle.

• ### REVIEW OF DOE’S VISION 21 RESEARCH AND DEVELOPMENT PROGRAM—PHASE I

The Committee to Review DOE’s Vision 21 R&D Program—Phase I wishes to acknowledge and thank the many individuals who contributed significantly of their time and effort to this National Research Council (NRC) study. The presentations at committee meetings provided valuable information and insight on advanced technologies and development initiatives that assisted the committee in formulating the recommendations included in this report.

• ### Báo cáo khoa học: " An Intelligent Microblog Analysis and Summarization System"

This paper presents a system to summarize a Microblog post and its responses with the goal to provide readers a more constructive and concise set of information for efficient digestion. We introduce a novel two-phase summarization scheme. In the first phase, the post plus its responses are classified into four categories based on the intention, interrogation, sharing, discussion and chat.

• ### Telecommunication systems

Amplitude distortion: Voice channel occupies the band from 300 to 3400 Hz. Some frequencies are attenuated more than others. Phase distortion Velocity of propagation varies with frequency. Filter: increase toward band center and decrease toward band edge.

• ### Báo cáo "Design of phase-coded transmitter and high sensitive receiver of radar system "

This paper reports experimental results of a radar system design. In the radar transmitter, a 13-bit Barker code with bit duration 3.24 µs and various other codes are generated by the microcontroller PIC16F877A. This code is then used to modulate IF 10.3 MHz to become BPSK signal. A stable local oscillator is also designed by PLL, VCO, and PIC16F877A. The operation frequency range of the oscillator is from 800 MHz to 900

• ### Báo cáo khoa học: Novel suppression mechanism operating in early phase of adipogenesis by positive feedback loop for enhancement of cyclooxygenase-2 expression through prostaglandin F2a receptor mediated activation of MEK⁄ ERK-CREB cascade

Prostaglandin (PG) F2asuppresses adipocyte differentiation by inhibiting the function of peroxisome proliferator-activated receptor c. In this study, we identified a novel suppression mechanism, operating in the early phase of adipogenesis, that increased the production of anti-adipogenic PGF2a and PGE2by enhancing cyclooxygenase (COX) 2

• ### Báo cáo khoa học: "Using Language Resources in an Intelligent Tutoring System for French"

This paper presents a project that investigates to what extent computational linguistic methods and tools used at GETA for machine translation can be used to i m p l e m e n t n o v e l f u n c t i o n a l i t i e s in intelligent c o m p u t e r assisted language learning. Our intelligent tutoring system project is still in its early phases. The learner module is based on an empirical study of French as used by Acadian e l e m e n...

• ### Lecture Digital signal processing: Lecture 5 - Zheng-Hua Tan

In this chapter you will learn: Frequency response, system functions, relationship between magnitude and phase, all-pass systems, minimum-phase systems, linear systems with generalized linear phase.

• ### Báo cáo khoa học: "Automated Japanese Essay Scoring System based on Articles Written by Experts"

We have developed an automated Japanese essay scoring system called Jess. The system needs expert writings rather than expert raters to build the evaluation model. By detecting statistical outliers of predetermined aimed essay features compared with many professional writings for each prompt, our system can evaluate essays.

• ### Báo cáo khoa học: "Multimodal Generation in the COMIC Dialogue System"

We describe how context-sensitive, usertailored output is speciﬁed and produced in the COMIC multimodal dialogue system. At the conference, we will demonstrate the user-adapted features of the dialogue manager and text planner. three-dimensional walkthrough of the ﬁnished bathroom. We will focus on how context-sensitive, usertailored output is generated in the third, guidedbrowsing phase of the interaction. Figure 2 shows a typical user request and response from COMIC in this phase.

• ### Báo cáo khoa học: "DESIGN OF A MACHINE TRANSLATION SYSTEM "

This paper describes the design of a prototype machine translation system for a sublanguage of job advertis~nents. The design is based on the hypothesis that specialized linguistic subsystems may require special crmputational treatment and that therefore a relatively shallow analysis of the text may be sufficient for automatic translation of the sublanguage. This hypothesis and the desire to minimize computation in the transfer phase has led to the adoption of a flat tree representation of the linguistic data. ...

• ### Oxidative dehydrogenation of n butane on vanadiummagnesium oxides system: the influence of orthovanadate phase on butadiene selectivity

Vanadium – Magnesium mixed oxides used for the oxidative dehydrogenation were synthesized by impregnation method. Characterization of catalysts was determined by serial model techniques such as XRD and N2 physisorption. The result of XRD showed that V2O5 phase was inhibited in the V-Mg-O mixed oxides prepared with impregnation method. Catalyst test performance showed high selectivity for the oxidative dehydrogenation of n-butane to butene and butadiene.