The Asymmetrical Response of the Human Ear in Relation to the Problem of Combination Tones

1941 ◽  
Vol 5 (1) ◽  
pp. 19-20
Author(s):  
Otto Stuhlman, Jr.
Keyword(s):  
Human Ear

How To Build a Human Ear

Skull Base ◽  
2007 ◽  
Vol 17 (S 1) ◽  
Author(s):  
Pierre Rabischong
Keyword(s):  
Human Ear

Effect of No-load and Load Condition on Transformer Sound

2018 ◽  
pp. 11-15
Author(s):  
Dr. Hitesh Paghadar
Keyword(s):  
Experimental Study ◽  
Power Transformer ◽  
Load Condition ◽  
Noise Pollution ◽  
Sound Level ◽  
Measurement Scale ◽  
Dominant Factor ◽  
Public Attention ◽  
Level Measurement ◽  
Human Ear

Increasing environment noise pollution is a matter of great concern and of late has been attracting public attention. Sound produces the minute oscillatory changes in air pressure and is audible to the human ear when in the frequency range of 20Hz to 20 kHz. The chief sources of audible sound are the magnetic circuit of transformer which produces sound due to magnetostriction phenomenon, vibration of windings, tank and other structural parts, and the noise produced by cooling equipments. This paper presents the validation for sound level measurement scale, why A-weighted scale is accepted for sound level measurement, experimental study carried out on 10MVA Power Transformer. Also presents the outcomes of comparison between No-Load sound & Load sound level measurement, experimental study carried out on different transformer like - 10MVA, 50MVA, 100MVA Power Transformer, to define the dominant factor of transformer sound generation.

Human Ear Pattern Recognition System

2017 ◽  
Vol 7 (8) ◽  
pp. 117 ◽  
Author(s):  
V. Jagan Naveen ◽  
K. Krishna Kishore ◽  
P. Rajesh Kumar
Keyword(s):  
Pattern Recognition ◽  
Expectation Maximization Algorithm ◽  
Recognition System ◽  
Modern World ◽  
Person Identification ◽  
Biometric Systems ◽  
Different Types ◽  
Recognition Systems ◽  
Human Ear ◽  
Pca Algorithm

In the modern world, human recognition systems play an important role to   improve security by reducing chances of evasion. Human ear is used for person identification .In the Empirical study on research on human ear, 10000 images are taken to find the uniqueness of the ear. Ear based system is one of the few biometric systems which can provides stable characteristics over the age. In this paper, ear images are taken from mathematical analysis of images (AMI) ear data base and the analysis is done on ear pattern recognition based on the Expectation maximization algorithm and k means algorithm.  Pattern of ears affected with different types of noises are recognized based on Principle component analysis (PCA) algorithm.

scholarly journals Fetal development and growth of the fissula ante fenestram in the human ear

2021 ◽  
Author(s):  
José Francisco Rodríguez‐Vázquez ◽  
María Cruz Iglesias‐Moreno ◽  
Adriana Poch ◽  
Gen Murakami ◽  
Hiroshi Abe ◽  
...  
Keyword(s):  
Fetal Development ◽  
Human Ear

scholarly journals Ozonized Water in Microbial Control: Analysis of the Stability, In Vitro Biocidal Potential, and Cytotoxicity

Biology ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 525
Author(s):  
Laerte Marlon Conceição dos Santos ◽  
Eduardo Santos da Silva ◽  
Fabricia Oliveira Oliveira ◽  
Leticia de Alencar Pereira Rodrigues ◽  
Paulo Roberto Freitas Neves ◽  
...  
Keyword(s):  
Microbial Control ◽  
Fibroblast Cell ◽  
In Vitro Assays ◽  
Control Analysis ◽  
Cytotoxic Effects ◽  
Cell Wall Lysis ◽  
Osmotic Stability ◽  
Human Ear ◽  
The Stability

O3 dissolved in water (or ozonized water) has been considered a potent antimicrobial agent, and this study aimed to test this through microbiological and in vitro assays. The stability of O3 was accessed following modifications of the physicochemical parameters of water, such as the temperature and pH, with or without buffering. Three concentrations of O3 (0.4, 0.6, and 0.8 ppm) dissolved in water were tested against different microorganisms, and an analysis of the cytotoxic effects was also conducted using the human ear fibroblast cell line (Hfib). Under the physicochemical conditions of 4 °C and pH 5, O3 remained the most stable and concentrated compared to pH 7 and water at 25 °C. Exposure to ozonized water resulted in high mortality rates for Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Enterococcus faecalis, and Candida albicans. Scanning electron micrograph images indicate that the effects on osmotic stability due to cell wall lysis might be one of the killing mechanisms of ozonized water. The biocidal agent was biocompatible and presented no cytotoxic effect against Hfib cells. Therefore, due to its cytocompatibility and biocidal action, ozonized water can be considered a viable alternative for microbial control, being possible, for example, its use in disinfection processes.

On the functions of the membrana tympani, the ossicles and muscles of the tympanum, and of the eustachian tube in the human ear, with an account of the muscles of the eustachian tube and their action in different classes of animals

1854 ◽  
Vol 6 ◽  
pp. 217-221 ◽  
Keyword(s):  
Eustachian Tube ◽  
Anterior Extremity ◽  
Anterior Part ◽  
Tensor Tympani Muscle ◽  
Human Ear ◽  
Single Bone

The author commences his paper by making some observations on the general arrangements of the ossicula auditûs . The malleus and incus being firmly connected together by ligaments, are considered as a single bone, forming an elastic arch, the anterior extremity of which is firmly attached to the Glasserian fissure, the posterior to the anterior part of the mastoid cells. This arch is kept steady by the actions of the tensor tympani. The movement of this arch is that of rotation; and it is effected by the tensor tympani muscle. When this muscle contracts, the lower part of the arch, consisting of the handle of the malleus and the long process of the incus, is drawn inwards; by this action the membrana tympani is rendered tense, and the stapes being pressed towards the cavity of the labyrinth, the fluid in the latter is compressed.

Dynamic Pitch Perception for Complex Tones of Periodic Spectral Patterns

1991 ◽  
Vol 8 (3) ◽  
pp. 291-314 ◽  
Author(s):  
Yoshitaka Nakajima ◽  
Hiroyuki Minami ◽  
Takashi Tsumura ◽  
Hiroshi Kunisaki ◽  
Shigeki Ohnishi ◽  
...  
Keyword(s):  
Paired Comparison ◽  
Fixed Ratio ◽  
Pitch Perception ◽  
The Other ◽  
Complex Tones ◽  
Logarithmic Frequency ◽  
Human Ear ◽  
Spectral Patterns ◽  
Pitch Movement

Pitch circularity as found in Shepard tones was examined by using complex tones that had various degrees of exactness in their spectral periodicities on the logarithmic frequency dimension. This dimension was divided into periods of 1400 cents by tone components, and each period was subdivided into two parts of a fixed ratio of 700:700, 600:800, 550:850, 500:900, 450:950, 400:1000, or 0:1400. Subjects made paired comparison judgments for pitch. When the subdividing ratio was 0: 1400 or 400:1000, the subjects responded to the spectral periodicity of 1400 cents, and, when the ratio was 700:700 or 600:800, they responded to the periodicity of 700 cents. Some seemingly intermediate cases between these two extremes or some qualitatively different cases were obtained in the other conditions. As we have asserted before, the human ear appears to detect a global pitch movement when some tone components move in the same direction by similar degrees on the logarithmic frequency dimension.

Sign in / Sign up

Export Citation Format

Share Document