# Natural frequencies

Xem 1-20 trên 92 kết quả Natural frequencies
• ### Natural frequency of fluid filled laminated composite cylindrical shells on elastic foundations

In this paper, natural frequency of completely fluid-filled composite circular cylindrical shells on Winkler and Pasternak elastic foundations are studied. The Dynamic Stiffness Method is employed to solve the cylindrical shell problem. Natural frequencies of fluid-filled cylindrical shells based on elastic foundations are evaluated. It is observed that frequencies are strongly affected when a cylindrical shell is attached with elastic foundations.

• ### Global Warming, Natural Hazards, and Emergency Management

Scientists predict the earth is facing 40-to-60 years of climate change, even if emissions of carbon dioxide and other global warming gases stopped today. One inevitable consequence of the greenhouse gases already in the atmosphere will be an increase in the frequency and severity of natural disaster events. Global Warming, Natural Hazards, and Emergency Management documents the imperative need for communities to prepare for the coming effects of climate change and provides a series of in-depth, road-tested recommendations on how to reduce risks for communities and businesses.

• ### Báo cáo " Using high algebra to design frequency divider include hazard "

Normally the frequency divider designed by Boole algebra and to design a frequency divider with any divide factor, we have to repeat all over again every design step as the same. So to avoid of wasting time and money, instead of using traditional Boole algebra in digital technical we replace it by mathematical models in high algebra. And because of that we can design frequency dividers use computer. 1. Modeling of function circuit

• ### Báo cáo khoa học: "Frequency Matters: Pitch Accents and Information Status"

This paper presents the results of a series of experiments which examine the impact of two information status categories (given and new) and frequency of occurrence on pitch accent realisations. More speciﬁcally the experiments explore within-type similarity of pitch accent productions and the effect information status and frequency of occurrence have on these productions. The results indicate a signiﬁcant inﬂuence of both pitch accent type and information status category on the degree of withintype variability, in line with exemplartheoretic expectations. ...

• ### Báo cáo khoa học: "Automatically Generating Term-frequency-induced Taxonomies"

We propose a novel method to automatically acquire a term-frequency-based taxonomy from a corpus using an unsupervised method. A term-frequency-based taxonomy is useful for application domains where the frequency with which terms occur on their own and in combination with other terms imposes a natural term hierarchy. We highlight an application for our approach and demonstrate its effectiveness and robustness in extracting knowledge from real-world data.

• ### Báo cáo khoa học: "High Frequency Word Entrainment in Spoken Dialogue"

Cognitive theories of dialogue hold that entrainment, the automatic alignment between dialogue partners at many levels of linguistic representation, is key to facilitating both production and comprehension in dialogue. In this paper we examine novel types of entrainment in two corpora—Switchboard and the Columbia Games corpus. We examine entrainment in use of high-frequency words (the most common words in the corpus), and its association with dialogue naturalness and ﬂow, as well as with task success. ...

• ### Báo cáo khoa học: "Towards Web-Based Evaluation of Automatic Natural Language Phrase Generation"

This paper describes a novel approach for the automatic generation and evaluation of a trivial dialogue phrases database. A trivial dialogue phrase is deﬁned as an expression used by a chatbot program as the answer of a user input. A transfer-like genetic algorithm (GA) method is used to generating the trivial dialogue phrases for the creation of a natural language generation (NLG) knowledge base. The automatic evaluation of a generated phrase is performed by producing n-grams and retrieving their frequencies from the World Wide Web (WWW).

• ### Right Word Wrong Word

In 1877 the Italian astronomer Giovanni Schiaparelli (1835-1910) observed some markings on the planet Mars which he referred to as canali. This was mistranslated into English as canals, suggesting man-made structures and the existence of intelligent life on Mars, instead of channels, which occur naturally. The idea of canals appealed to the imaginations of scientists and novelists alike. The astronomer Percival Lowell used it as the basis for his 'scientific observations', recorded in such works as Mars and its Canals (1908). The novelist H.G.

• ### Thiết kế công trình chịu tác động của tải trọng động đất bằng ETABS version 9

1. Các khái niệm cần lưu ý: 1.1. Khối lượng, m: Theo định luật Newton, lực F = m x a. Khối lượng m º F Û gia tốc a = 1 m/s2. 1.2. Bậc tự do, DOF: Có hai loại sau: MDOF, hệ nhiều bậc tự do; SDOF, hệ một bậc tự do. 1.3. Tần số dao động tự nhiên và mode dao động tự nhiên (Natural Frequency, dao động mà công trình có được do trọng lượng bản thân của nó, không có sự tác động của tải trọng ngoài)

• ### Bài giảng lý thuyết điều khiển tự động - Khảo sát tính ổn định của hệ thống part 5

Trong phần này ta sẽ xem xét hai khái niệm của hai thông số hệ thống bậc 2 được dùng để miêu tả đường đặc tính đáp ứng thời gian. Đó là tần số tự do (natural frequency) và hệ số tắt dần (damping ratio). - Tần số tự do (Natural Frequency, ωn): là tần số của dao đông trong hệ thống mà không có sự tắt dần.

Learning how to write a coherent, effective text is a difficult and protracted achievement of cognitive development that contrasts sharply with the acquisition of speech. By the age of 5, spoken language is normally highly developed with a working vocabulary of several thousand words and an ability to comprehend and produce grammatical sentences. Although the specific contribution of a genetic predisposition for language learning is unsettled, it is apparent that speech acquisition is a natural part of early human development.

• ### THE ENGINEERING THE HANDBOOK - SECOND EDITION I

Due to the success of the first edition of The Engineering Handbook published in 1995 I am pleased to provide the second edition ten years later fully updated and expanded. Purpose The purpose of The Engineering Handbook, Second Edition is to provide in a single volume a ready reference for the practicing engineer in industry, government, and academia. The book in its comprehensive format is divided into 30 sections which encompass the field of engineering and includes 19 brand new chapters and 131 fully updated contributions.

• ### THE ENGINEERING THE HANDBOOK - SECOND EDITION II (end)

Tham khảo sách 'the engineering the handbook - second edition ii (end)', khoa học tự nhiên, hoá học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

• ### Application of Principles of Accounting and Financial Reporting To Public Telecommunications Entities

The DOE’s Carbon Sequestration Program also supports global initiatives, such as the Carbon Sequestration Leadership Forum (CSLF), an international climate change initiative that focuses on the development of technologies to cost-effectively capture and sequester CO2, and the International Energy Agency (IEA). The Carbon Sequestration Program is also providing technical and financial support to international projects through the Core R&D MVA Program. Projects include the Weyburn Project (see Section 3.

• ### Ebook Vibrations (2nd edition): Part 2

(BQ) Part 1 book "Vibrations" has contents: Single-degree-of-freedom systems - subjected to transient excitations, multiple degree-of-freedom systems - governing equations, natural frequencies, and mode shapes, multiple degree of freedom systems - general solution for response and forced oscillations, vibrations of beams.

• ### VIBRATION AND SHOCK

In any structure or assembly, certain whole-body motions and certain deformations are more common than others; the most likely (easiest to excite) motions will occur at certain natural frequencies. Certain exciting or forcing frequencies may coincide with the natural frequencies (resonance) and give relatively severe vibration responses. We will now discuss the much-simplified system shown in Fig.

• ### Arnott hamilton byzantine architecture

In a world where the population is expected to rise to 10 billion by the turn of the century, accelerating urbanisation and the increasing the demand for food and energy; taking action to secure sufficient water of acceptable quality for humans and nature is as urgent as ever. Climate change is projected to aggravate water stress in many regions, especially where water is already scarce and where the demand for water is growing rapidly. Increased frequency of floods is also projected.

• ### Vibrational Optical Activity Principles and Applications

During the years surrounding the new millennium, the field of vibrational optical activity (VOA), comprised principally of vibrational circular dichroism (VCD) and vibrational Raman optical activity (ROA), underwent a transition from a specialized area of research that had been practiced by a handful of pioneers into an important newfield of spectroscopy practiced by an increasing number of scientists worldwide. This transition was made possible by the development of commercial instrumentation and software for the routine measurement and quantum chemical calculation ofVOA.

• ### Đề tài " On Mott’s formula for the acconductivity in the Anderson model "

We study the ac-conductivity in linear response theory in the general framework of ergodic magnetic Schr¨dinger operators. For the Anderson model, o if the Fermi energy lies in the localization regime, we prove that the ac1 conductivity is bounded from above by Cν 2 (log ν )d+2 at small frequencies ν. This is to be compared to Mott’s formula, which predicts the leading term to 1 be Cν 2 (log ν )d+1 .