WELDING OF POLYVINYLE CHLORIDE SHEETS BY A HIGH-FREQUENCY METHOD

1989 ◽  
pp. 577-585
Author(s):  
A.B.M. Khairy
Keyword(s):  
High Frequency ◽  
Frequency Method

Investigating Fatigue Strength of Vacuum Carburized 17CrNi6-6 Steel Using a Resonance High Frequency Method

2014 ◽  
Vol 225 ◽  
pp. 45-52 ◽  
Author(s):  
Piotr Kula ◽  
Konrad Dybowski ◽  
Sebastian Lipa ◽  
Robert Pietrasik ◽  
Radomir Atraszkiewicz ◽  
...  
Keyword(s):  
High Pressure ◽  
Fatigue Strength ◽  
High Frequency ◽  
Vacuum Carburizing ◽  
Frequency Method ◽  
Single Degree Of Freedom ◽  
Bending Fatigue ◽  
Single Degree ◽  
Bending Fatigue Strength ◽  
Frequency Changes

The bending fatigue strength of 17CrNi6-6 steel subjected to vacuum carburizing with high pressure gas hardening has been measured using a novel high-frequency technique. The test records the changes in resonance and consists of observing resonance frequency changes in a vibrating system with a single degree of freedom as a result of the forming of a fatigue crack. Moreover, a mechanism of fatigue nucleation and propagation in steel hardened by vacuum carburizing is presented.

scholarly journals Structural drilling using the high-frequency (sonic) rotary method

2017 ◽  
Vol 64 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Jurij Šporin ◽  
Željko Vukelić
Keyword(s):  
High Frequency ◽  
Final Part ◽  
Frequency Method ◽  
High Quality ◽  
Core Drilling ◽  
Drilling Method ◽  
Highly Effective ◽  
Theoretical Foundations

AbstractIn Slovenia, there is widespread use of structural drilling along with classical core drilling. Recently, however, the need has arisen for a highly effective core drilling method with the aid of which high-quality core might be obtained. In order to achieve this aim, one among several Slovenian companies dealing with geological surveying has decided to implement structural drilling using a high-frequency drilling method. The following article presents the theoretical foundations for such a high-frequency method, as well as the manner of its implementation. In the final part of the article, a practical comparison between the conventional and the high-frequency core drilling methods is also provided.

Rapid determination of water in benzoyl peroxide by high frequency method

1973 ◽  
Vol 22 (11) ◽  
pp. 1440-1445
Author(s):  
Yuichi KAMURA ◽  
Sabro MIZUTANI ◽  
Keiko TOMIHISA ◽  
Masakazu SUGIYAMA
Keyword(s):  
Benzoyl Peroxide ◽  
High Frequency ◽  
Rapid Determination ◽  
Frequency Method

scholarly journals The high-frequency method for scattering from the wedges of complex conductive targets in half space

2009 ◽  
Vol 58 (2) ◽  
pp. 908
Author(s):  
Li Xiao-Feng ◽  
Xie Yong-Jun ◽  
Fan Jun ◽  
Wang Yuan-Yuan
Keyword(s):  
Half Space ◽  
High Frequency ◽  
Frequency Method

Prediction of High Frequency Sonic Boom Noise Transmission Into Buildings Using a Hybrid Analytical-Ray Tracing Approach

2012 ◽  
Author(s):  
Joseph M. Corcoran ◽  
Marcel C. Remillieux ◽  
Ricardo A. Burdisso
Keyword(s):  
Ray Tracing ◽  
High Frequency ◽  
Acoustic Radiation ◽  
Low Frequency ◽  
Sonic Boom ◽  
Acoustic Transmission ◽  
Frequency Method ◽  
Low Frequencies ◽  
Sonic Booms ◽  
Acoustic Responses

As part of the effort to renew commercial supersonic flight, a predictive numerical tool to compute sonic boom transmission into buildings is under development. Due to the computational limitations of typical numerical methods used at low frequencies (e.g. Finite Element Method), it is necessary to develop a separate approach for the calculation of acoustic transmission and interior radiation at high frequencies. The high frequency approach can then later be combined with a low frequency method to obtain full frequency vibro-acoustic responses of buildings. An analytical method used for the computation of high frequency acoustic transmission through typical building partitions is presented in this paper. Each partition is taken in isolation and assumed to be infinite in dimension. Using the fact that a sonic boom generated far from the structure will approximate plane wave incidence, efficient analytical solutions for the vibration and acoustic radiation of different types of partitions are developed. This is linked to a commercial ray tracing code to compute the high frequency interior acoustic response and for auralization of transmitted sonic booms. Acoustic and vibration results of this high frequency tool are compared to experimental data for a few example cases demonstrating its efficiency and accuracy.

scholarly journals Comparison of Pure-Tone Average Methods for Estimation of Hearing Loss Caused by Environmental Exposure to Lead and Cadmium: Does the Pure-Tone Average Method Which Uses Low-Frequency Ranges Underestimate the Actual Hearing Loss Caused by Environmental Lead and Cadmium Exposure?

2018 ◽  
Vol 23 (5) ◽  
pp. 259-269 ◽  
Author(s):  
Da-An Huh ◽  
Yun-Hee Choi ◽  
Myung Sun Ji ◽  
Kyong Whan Moon ◽  
Seok J. Yoon ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Environmental Exposure ◽  
High Frequency ◽  
Pure Tone ◽  
Low Frequency ◽  
Cadmium Exposure ◽  
Metal Exposure ◽  
Frequency Method ◽  
Pure Tone Average ◽  
Lead And Cadmium

Previous studies have reported that exposure to lead and cadmium can damage the inner ear receptor, which perceives high-frequency sounds. However, few studies have used the pure-tone average (PTA), including high-frequency ranges, for the estimation of hearing loss caused by lead and cadmium exposure. We estimated hearing loss using the PTA test, in low-frequency, speech frequency, and high-frequency ranges and compared the differences in the results using 3 PTA calculation methods. We analyzed the data of 2,387 participants, between the ages of 19 and 85 years, that were obtained from the Korea National Health and Nutrition Examination Survey (KNHANES) of 2010–2012. A dose-response relationship between hearing loss and heavy metal exposure was observed in the high-frequency method after adjustment for confounding factors. When using the high-frequency PTA, it was found that doubling of the levels of lead and cadmium in the blood was associated with a 1.88- (95% CI 1.11–3.17) and 1.89-fold (95% CI 1.02–3.50) increase in the OR for hearing loss. In the case of the low-frequency and speech frequency PTA, however, there were no significant relationships between hearing loss and the concentrations of lead and cadmium in the blood. The outcomes of the present study suggest that the estimation of hearing loss caused by environmental exposure to lead and cadmium is affected by the frequencies used in the PTA calculation.

Sign in / Sign up

Export Citation Format

Share Document