scholarly journals A low-frequency torsion pendulum with interferometric readout

2021 ◽  
Vol 92 (5) ◽  
pp. 054502
Author(s):  
M. P. Ross ◽  
K. Venkateswara ◽  
C. A. Hagedorn ◽  
C. J. Leupold ◽  
P. W. F. Forsyth ◽  
...  
Keyword(s):  
Low Frequency ◽  
Torsion Pendulum

scholarly journals Torsion-Bar Antenna: A ground-based mid-frequency and low-frequency gravitational wave detector

2019 ◽  
Vol 29 (04) ◽  
pp. 1940003 ◽  
Author(s):  
Tomofumi Shimoda ◽  
Satoru Takano ◽  
Ching Pin Ooi ◽  
Naoki Aritomi ◽  
Yuta Michimura ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Gravitational Wave ◽  
Low Frequency ◽  
Gravitational Wave Detector ◽  
Torsion Pendulum ◽  
Rotational Mode ◽  
Prototype Development ◽  
The Past ◽  
Wave Detector ◽  
Torsion Bar

Expanding the observational frequency of gravitational waves is important for the future of astronomy. Torsion-Bar Antenna (TOBA) is a mid-frequency and low-frequency gravitational wave detector using a torsion pendulum. The low resonant frequency of the rotational mode of the torsion pendulum enables ground-based observations. The overview of TOBA, including the past and present status of the prototype development, is summarized in this paper.

EXPERIMENTAL STUDY OF ENERGY ABSORPTION PROPERTIES OF GRANULAR MATERIALS UNDER LOW FREQUENCY VIBRATIONS

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2708-2712
Author(s):  
MAO-BIN HU ◽  
XIANG-ZHAO KONG ◽  
QING-SONG WU ◽  
ZHEN-GANG ZHU
Keyword(s):  
Experimental Study ◽  
Granular Materials ◽  
Energy Absorption ◽  
Vibration Frequency ◽  
Absorption Rate ◽  
Low Frequency ◽  
Vibration Energy ◽  
Torsion Pendulum ◽  
Absorption Properties ◽  
Low Frequency Vibration

The low frequency vibration energy absorption properties of granular materials have been investigated on an Invert Torsion Pendulum (ITP). The energy absorption rate of granular material changes nonlinearly with amplitude under low frequency vibration. The frequency of ITP system increases a little with granular materials in the holding cup. The vibration frequency of ITP system does not change with time.

A Low-Frequency Forced Torsion Pendulum for the Measurement of the Mechanical Properties of Granular Media

2000 ◽  
Vol 627 ◽  
Author(s):  
G. D'Anna
Keyword(s):  
Mechanical Properties ◽  
Granular Media ◽  
Low Frequency ◽  
Glass Beads ◽  
Torsion Pendulum ◽  
Dynamic Moduli ◽  
Small Glass ◽  
Static Mechanical ◽  
Macroscopic Failure ◽  
Static Mechanical Properties

ABSTRACTWe present a forced torsion pendulum designed to measure the dynamic moduli of granular media. In the method, the oscillating probe of the pendulum is immersed into various materials, such as sand, glass beads, snow. The apparatus operates at low-frequency and provides information about the quasi-static mechanical properties of the medium. In particular, a peak in the losses is ascribed to friction and cohesion between the grains, and a measure of the macroscopic failure limit can be obtained. As an example the effect of moisture-induced ageing in small glass beads, and the effect of sintering of ice grains in snow, are shown.

Zero-Point Drift in Low-Frequency Mechanical Spectroscopy

2006 ◽  
Vol 115 ◽  
pp. 285-292 ◽  
Author(s):  
Leszek B. Magalas ◽  
A. Piłat
Keyword(s):  
Low Frequency ◽  
Zero Point ◽  
Logarithmic Decrement ◽  
Torsion Pendulum ◽  
Mechanical Spectroscopy ◽  
Mechanical Loss ◽  
Harmonic Oscillations

The concept of the ‘zero-point drift’, ZPD, is introduced and analyzed on the basis of mechanical loss measurements carried out in a low-frequency mechanical spectrometer – inverted torsion pendulum. It is demonstrated that the ZPD, which modifies damped harmonic oscillations leads to false values of the logarithmic decrement computed from several widely accepted algorithms.

A Study on the Fine Structure of the Lateral Line Organ of the Sea Eel

1973 ◽  
Vol 31 ◽  
pp. 648-649
Author(s):  
K. Hama
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Lateral Line ◽  
Low Frequency ◽  
Sensory Cells ◽  
Apical Surface ◽  
Voltage Electron ◽  
Sensory Epithelia ◽  
Low Frequency Vibration ◽  
Transmission Electron

The lateral line organs of the sea eel consist of canal and pit organs which are different in function. The former is a low frequency vibration detector whereas the latter functions as an ion receptor as well as a mechano receptor.The fine structure of the sensory epithelia of both organs were studied by means of ordinary transmission electron microscope, high voltage electron microscope and of surface scanning electron microscope.The sensory cells of the canal organ are polarized in front-caudal direction and those of the pit organ are polarized in dorso-ventral direction. The sensory epithelia of both organs have thinner surface coats compared to the surrounding ordinary epithelial cells, which have very thick fuzzy coatings on the apical surface.

Lectin Binding to Human Breast Tumor Cells

1976 ◽  
Vol 34 ◽  
pp. 34-35
Author(s):  
Robert E. Nordquist ◽  
J. Hill Anglin ◽  
Michael P. Lerner
Keyword(s):  
Carcinoma Cell ◽  
Ricinus Communis ◽  
Lectin Binding ◽  
Low Frequency ◽  
Breast Carcinoma Cell Line ◽  
Human Breast ◽  
Human Breast Tumor ◽  
Duct Carcinoma ◽  
Specific Antigens ◽  
Ricin Agglutinin

A human breast carcinoma cell line (BOT-2) was derived from an infiltrating duct carcinoma (1). These cells were shown to have antigens that selectively bound antibodies from breast cancer patient sera (2). Furthermore, these tumor specific antigens could be removed from the living cells by low frequency sonication and have been partially characterized (3). These proteins have been shown to be around 100,000 MW and contain approximately 6% hexose and hexosamines. However, only the hexosamines appear to be available for lectin binding. This study was designed to use Concanavalin A (Con A) and Ricinus Communis (Ricin) agglutinin for the topagraphical localization of D-mannopyranosyl or glucopyranosyl and D-galactopyranosyl or DN- acetyl glactopyranosyl configurations on BOT-2 cell surfaces.

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