Relevant bibliographies by topics / Basic measurement Helmholtz

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Basic measurement Helmholtz'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Basic measurement Helmholtz"

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Zhu, Jun Feng, Xin Yan, Ling Ling Zhou, and Xiao Xin Zhao. "Measurement of Helmholtz Coil." Applied Mechanics and Materials 738-739 (March 2015): 893–98. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.893.

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Based on the basic principles of electromagnetism, the application of Shanghai Fudan-day Welcomes UNESCO Instruments Ltd. THQHC-1 type Helmholtz coil magnetic field measuring instrument for measuring coil uniform magnetic field generates a magnetic field on the carrier to get round the coil axis, online circle center at (coordinate origin) at the maximum magnetic field strength. Starting from the coordinate origin, to the sides, the magnetic field lines accelerate the decline, when the distance exceeds the coil radius, the decelerating decline. Conclusions for the understanding of a uniform ma
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FFOWCS WILLIAMS, J. E., and W. MÖHRING. "Control action for stabilizing free shear layers." Journal of Fluid Mechanics 404 (February 10, 2000): 27–46. http://dx.doi.org/10.1017/s0022112099007156.

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The possibility of acoustic control of the two-dimensional instabilities of a lossless plane shear layer of vanishing thickness is studied. The shear layer is formed from a body of incompressible fluid sliding over another fluid at rest. It is unstable through the generation of Kelvin–Helmholtz waves. We consider the possibility of adding to this linearly unstable flow a simple source, driven in such a way that its field interferes destructively with the instability to render the flow stable. The required strength of the unsteady control source is determined in terms of the fluctuating velocit
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Schmidgen, Henning. "Leviathan and the Myograph: Hermann Helmholtz's “Second Note” on the Propagation Speed of Nervous Stimulations." Science in Context 28, no. 3 (2015): 357–96. http://dx.doi.org/10.1017/s0269889715000174.

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ArgumentIn the winter of 1849–1850 in Königsberg, German physiologist Hermann von Helmholtz (1821–1894) conducted pioneering measurements concerning the propagation speed of stimulations in the living nerve. While recent historians of science have paid considerable attention to Helmholtz's uses of the graphic method, in particular his construction of an instrument called “myographion,” this paper draws attention to the inscription surfaces that he used in effective ways for capturing and transmitting his findings. Against the background of recent archival findings, I show that Helmholtz used i
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Opilski, Z., G. Konieczny, T. Pustelny, A. Gacek, R. Kustosz, and M. Gawlikowski. "Noninvasive acoustic blood volume measurement system for the POLVAD prosthesis." Bulletin of the Polish Academy of Sciences: Technical Sciences 59, no. 4 (2011): 429–33. http://dx.doi.org/10.2478/v10175-011-0053-7.

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Noninvasive acoustic blood volume measurement system for the POLVAD prosthesisThe following paper presents researches concerning a noninvasive real-time blood volume measurement system applied in POLVAD prosthesis. The system is based on the acoustic Helmholtz resonator principle. The basis of the measurement method, followed by the preliminary tests of the possibility of incorporating the Helmholtz resonance idea into the POLVAD prosthesis is shown. The paper includes the actual measurement system construction and test results, both static and dynamic obtained at the Foundation for Cardiac Su
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Namvar Arefi, Hossein, Seyyed Mohammad Amin Ghiasi, Seyyede Mahshid Ghaffari, et al. "Conference Room Reverberation Time Correction Using Helmholtz Resonators Lined with Absorbers." Shock and Vibration 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/472524.

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Echo and sound resonance in a conference room cause obscure speech and make listeners tired. Thus, the acoustical properties of a conference room are vitally important. The conference room 412 at Sharif University Physics Department failed to meet basic acoustical standards. The aim of this research is to improve reverberation time (RT) of the conference room using Helmholtz resonators with defined dimensions, diffusers, and sound absorbers. Helmholtz resonators are widely used to absorb sound noise especially at low frequencies. They are particularly useful when noise has a narrow-frequency b
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Wang, Fuzhang, and Zhaoxing Ma. "Meshless Collocation Method for Inverse Source Identification Problems." Advances in Applied Mathematics and Mechanics 7, no. 4 (2015): 496–509. http://dx.doi.org/10.4208/aamm.2014.m611.

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AbstractA novel meshless scheme is proposed for inverse source identification problems of Helmholtz-type equations. It is formulated by the non-singular general solutions of the Helmholtz-type equations augmented with radial basis functions. Under this meshless scheme, we can determine smooth source terms from partially accessible boundary measurements with accurate results. Numerical examples are presented to verify validity and accuracy of the present scheme. It is demonstrated that the present scheme is simple, accurate, stable and computationally efficient for inverse smooth source identif
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Zhao, Jun Juan, Xian Hui Li, Zhan Zhao, Xiao Ling Gai, and Yan Qi Liu. "Photoacoustic Resonant Cell Remodified from Helmholtz Cavity for Multi-Gas Sensing Using Infrared Lasers." Key Engineering Materials 562-565 (July 2013): 1016–20. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.1016.

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This paper presents method and performance of the photoacoustic resonant cell remodified from Helmholtz cavity that can be used to detect photoacoustic signal of multi-gas. This technique has its physical basis in a phenomenon called the photoacoustic effect. The experiment system is composed of a resonant Helmholtz cavity, a sensitive microphone and two infrared lasers with high adsorption capability and specificity to the analyte. In our experiments, the average optical power at the laser operating point is 200mW for the 972nm laser (H2O detection) and 800mW for the10.653um laser (CO2detecti
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Heinzmann, Gerhard. "The Foundations of Geometry and the Concept of Motion: Helmholtz and Poincaré." Science in Context 14, no. 3 (2001): 457–70. http://dx.doi.org/10.1017/s0269889701000163.

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ArgumentAccording to Hermann von Helmholtz, free mobility of bodies seemed to be an essential condition of geometry. This free mobility can be interpreted either as matter of fact, as a convention, or as a precondition making measurements in geometry possible. Since Henri Poincaré defined conventions as principles guided by experience, the question arises in which sense experiential data can serve as the basis for the constitution of geometry. Helmholtz considered muscular activity to be the basis on which the form of space could be construed. Yet, due to the problem of illusion inherent in th
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Lin, Tim T., and Felix J. Herrmann. "Compressed wavefield extrapolation." GEOPHYSICS 72, no. 5 (2007): SM77—SM93. http://dx.doi.org/10.1190/1.2750716.

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An explicit algorithm for the extrapolation of one-way wavefields is proposed that combines recent developments in information theory and theoretical signal processing with the physics of wave propagation. Because of excessive memory requirements, explicit formulations for wave propagation have proven to be a challenge in 3D. By using ideas from compressed sensing, we are able to formulate the (inverse) wavefield extrapolation problem on small subsets of the data volume, thereby reducing the size of the operators. Compressed sensing entails a new paradigm for signal recovery that provides cond
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McManus, Thomas Neil, Ana Rosa, and Assed Haddad. "Quantifying Air Movement Induced by Natural Forces in an Isolated Structure in the Subsurface Infrastructure." Infrastructures 6, no. 1 (2020): 3. http://dx.doi.org/10.3390/infrastructures6010003.

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This article describes the development and demonstration of a non-intrusive method for the quantitative determination of speed of air movement along the ground and inside an isolated subsurface structure, a type of confined space. Natural ventilation occurs continuously and reduces risk to entrants from contact with a hazardous atmosphere. One of the most important parameters still undetermined was the speed of air movement during the process. Small puffs of artificial “smoke” were used to visualize air movement. Tracker, an open-source physics program, provided the capability to analyze this
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Dissertations / Theses on the topic "Basic measurement Helmholtz"

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Hartmann, Bruno. "Physical determination of the action." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17369.

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Mein Ziel ist eine Begründung der Physik aus der Operationalisierung ihrer Grundmaße. Wir beginnen mit der klassischen und relativistischen Kinematik. Dann greifen wir einen programmatischen Entwurf von Heinrich Hertz auf und gelangen über die Quantifizierung von Energie und Impuls zu den Bewegungsgleichungen und dem Wirkungsfunktional. Den Abschluß bildet eine relativistische Revision der Energie, Impuls und Massenvorstellung. Das Ziel ist nicht primär, den mathematischen Aufbau der Mechanik zu ändern oder zu verbessern, sondern ein tieferes physikalisches Verständnis der Mechanik zu erlangen
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Conference papers on the topic "Basic measurement Helmholtz"

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Gosweiller, Christoph, Bryan Willson, and Thomas Walter. "Application of an Improved Model for the Determination of Acoustic Resonances in Indicator Passages for Combustion Pressure Measurements." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1373.

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The acoustic resonances in indicator passages are often modeled using either a Helmholtz or a so called organ pipe acoustical model. However, in practice these models often indicate natural frequencies which are too high. This paper proposes the Bergh and Tijdeman model [1] which is more accurate and which was originally developed for pressure measurements in turbomachinery. This paper presents the theoretical basis for the Berg / Tijdeman model and then uses it to explore signal distortion from a variety of indicator passage geometries. In order to validate the approach, a flush-mounted water
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Bothien, Mirko R., Nicolas Noiray, and Bruno Schuermans. "A Novel Damping Device for Broadband Attenuation of Low-Frequency Combustion Pulsations in Gas Turbines." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68873.

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Damping of thermoacoustically induced pressure pulsations in combustion chambers is a major focus of gas turbine operation. Conventional Helmholtz resonators are an excellent means to attenuate thermoacoustic instabilities in gas turbines. Usually, however, the damping optimum is in a narrow frequency band at one operating condition. The work presented here deals with a modification of the basic Helmholtz resonator design over-coming this drawback. It consists of a damper body housing separated volumes that are connected to each other. Adequate adjustment of the governing parameters results in
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Williams, Alicia M., and Pavlos P. Vlachos. "Spatiotemporally-Resolved Dynamics of Dispersing Ferrofluid Aggregates." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55275.

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Ferrohydrodynamics research has been approached predominantly from either numerical or basic experimental techniques. However, to date, these experimental techniques have been limited to ultrasonic point measurements or shadowgraphs due to the opacity of the ferrofluids. As a result, the complete dynamics of many ferrohydrodynamics flows have remained unexplored. In this work, Time Resolved Digital Particle Image Velocimetry (TRDPIV) is employed to fully resolve the dynamic interaction of ferrofluid aggregates with bulk nonmagnetic fluids. This topic is hydrodynamically rich, where shearing be
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