The Mechanics of Stridulation in Bush Crickets (Tettigonioidea, Orthoptera)

1970 ◽  
Vol 52 (3) ◽  
pp. 495-505 ◽  
Author(s):  
W. J. BAILEY
Keyword(s):  
Detailed Analysis ◽  
Pure Tone ◽  
Sound Production ◽  
Sound Radiation ◽  
Rotational Axis ◽  
The Right ◽  
Bush Crickets

1. A method has been devised by which the isolated tegmina of bush crickets can be actuated in such a manner as to simulate the insect's natural song. 2. The actuator was used to make a detailed analysis of the mechanics of sound production, with particular reference to the emission of the more or less pure tone at 15 kHz., characteristic of Homorocoryphus nitidulus. 3. Results involving damping and cautery indicated that the area of the right tegmen responsible for the radiation of this sound was the mirror frame, the vein enclosing the classical mirror membrane. 4. Further experiments involving transduced sound and a probe microphone led to the construction of sound radiation maps of the right tegmen which supported the above view. 5. The cantilever hypothesis, involving the mirror frame with the axis of the vestigial file as the cantilever's rotational axis, was considered in the light of the Homorocoryphus type. 6. The Homorocoryphus type differed from the Conocephalus type (on which the cantilever hypothesis was based) in that a simpler cantilever is formed in a line direct from the plectrum to the tip of the frame arm.

scholarly journals STUDY OF PREVALENCE AND PATTERN OF HEARING LOSS IN PATIENTS OF HEPATITIS B

2019 ◽  
Vol 3 (12) ◽  
Author(s):  
Kapildev Mondal ◽  
Poulomi Saha
Keyword(s):  
Hearing Loss ◽  
Chronic Hepatitis ◽  
Hepatitis B ◽  
Chronic Hepatitis B ◽  
Pure Tone ◽  
Control Group ◽  
Hepatitis B Infection ◽  
Cellular Carcinoma ◽  
The Right ◽  
Hep B

Hepatitis B has been documented to cause various extra hepatic manifestations along with known hepatic complications. It has been reported that hepatitis-B patients are more susceptible to inner ear damage and hearing loss. The aim of this study is to evaluate hearing loss among patients of   hepatitis B {all 6 categories Hepatitis B infection: chronic Hepatitis B  infection , hepatitis B cirrhosis ,Hepatitis B virus carriers , occult chronic Hepatitis B and Hepatitis B infection with poly arthritis nodosa, hepato cellular carcinoma with hepatitis B}compared with healthy subjects. METHOD: In this case control study 100 Hepatitis B positive patients and 100 age and gender-matched healthy individuals were included over the period of 5 years. All of them were known cases of chronic hepatitis B positive for   HBsAg at least for 18 months. All   patients were aged 18 to 50 years to exclude presence of presbycusis. After base line investigations, they were subjected for all cases and controls were subjected otoscopic examination and hearing assessment using standard pure tone audiometry. Descriptive statistical analysis has been carried out in this study. RESULT: In patients of Hepatitis B (94 patients,6 patients had of  natural death ) pure tone average (mean thresholds 250,500, 1000,2000,4000 &8000 Hz) was 28.4 dB in the right ear and 27.3 dB in the left (hearing loss).In the control group(96 patients,4 patients dropped out), PTA average was 9.9 dB in the right ear and 9.3dB in the left (normal hearing). In both groups, Speech Discrimination score (SDS) was100% in both ears. The percentage of hearing loss in the right and left ear over the total of six frequencies differed significantly in the two groups. Out of 94 patients of control group, 38 patients (40.4%) patients presented with Chronic Liver Disease (CLD), 14 patients (14.8%) patients presented with cirrhosis with Hepatitis B, 6 (6.3%) patients had Poly arthritis Nodosa with Hep-B, 18(19.1%) patients were diagnosed as carrier of Hepatitis-B , 11(11.7%) patients had occult Hepatitis-B and 7(7.4%) patients were diagnosed with hepato cellular carcinoma. Hearing loss was maximum in patients of   PAN with Hep-B. Second highest mean SNHL was seen in patients of Hep-B with cirrhosis .Third highest mean hearing loss was noted in patients with HCC .Forth highest mean hearing loss was noted in patients with occult Hep-B. Fifth highest mean hearing loss was noted in carriers of Hep-B.Lowest group with SNHL was chronic liver disease. CONCLUSION: Regular audiometric tests are recommended for patients with HBV infection to assess their hearing ability and enable the earlier detection of SNHL. We also suggest that HBV presenting with the sudden onset of hearing loss should be examined for the possibility of acute exacerbation of chronic HBV infection. KEYWORDS: Mean, Sensorineural, Hearing loss, Cirrhosis.

scholarly journals Hearing Thresholds of Nigerian Navy Personnel Serving in Lagos Area

2021 ◽  
Author(s):  
Abubakar O Aliyu ◽  
Waheed A Adedeji ◽  
Adekunle Daniel ◽  
Tajudeen Yusuf ◽  
Paul A Onakoya ◽  
...  
Keyword(s):  
Hearing Impairment ◽  
Pure Tone ◽  
Past History ◽  
Pure Tone Audiometry ◽  
Work Place ◽  
Cross Sectional ◽  
Pure Tone Average ◽  
Hearing Thresholds ◽  
The Right ◽  
Navy Personnel

Abstract Introduction: Navy personnel are exposed to several risk factors that increase hearing thresholds and impair hearing. The aim of the study was to determine the prevalence of hearing impairment among Nigerian Navy personnel. Materials and Method: This was a cross sectional study of Nigerian Navy personnel working in various ships. Structured, self-administered questionnaire was used to obtain information on hearing. All the subjects had ear examination and pure tone audiometry of both ears. Results: The prevalence of hearing impairment was 22(14.7%) in the right and 17(11.3%) in the left ears. The Pure Tone Average for the right and left ear were 19.0±8.6dB and 17.4±6.7dB respectively. There was a statistically significant association between noisy work place and total hearing loss (p<.01), pure tone average in the left ear (p<.05) and frequencies of 3000 Hz (p<.05), 2000 Hz (p<.001) and 1000Hz (p<.05) in the left ear. The association between past history of ear infections and pure tone average in the left ear (p<.05) and the frequency 2000 Hz (p<.005) in the left ear were significant. The length of service years, occupational group, age, sex report of change in hearing, non-use of hearing protection and presence of tinnitus did not show significant association with pure tone averages nor on the frequencies tested. Conclusion: The significant unilateral hearing impairment on the right ear suggests the need for more research on hearing impairment in the Nigerian Navy as well as development of a comprehensive hearing conservation programme.

scholarly journals A novel stimulus paradigm for simultaneous recording of monaural and binaural frequency following response for identification of binaural interaction component

2020 ◽  
Author(s):  
Srividya Grama Bhagavan ◽  
Mohan Kumar Kalaiah
Keyword(s):  
Young Adults ◽  
Pure Tone ◽  
Stimulus Presentation ◽  
Simultaneous Recording ◽  
The Novel ◽  
Frequency Following Response ◽  
Binaural Interaction ◽  
The Right ◽  
Interaction Component

AbstractThe objective of the study was to investigate whether monaural frequency following response (FFR) of right and left ear and binaural FFR could be obtained in the same recording using a novel stimulus presentation paradigm, for the purpose of identification the BIC. Twenty six young adults participated in the study. The FFR was recorded for 220 Hz pure-tone using a novel stimulus paradigm. The pure-tone was presented sequentially to two ears. Initially, the pure-tone was presented to the right ear, then to both ears, and finally to the left ear. The FFR could be elicited from all participants (all three responses: right ear, left ear, and both ears) in the same recording using the novel stimulus presentation paradigm used in the present study. The novel stimulus presentation paradigm used in the present study could be used for obtaining monaural and binaural FFRs in the same recording for identification of BIC.

The Right to Return: The Biblical Law of Theft

2010 ◽  
pp. 28-41 ◽  
Author(s):  
Eliakim Katz ◽  
Jacob Rosenberg
Keyword(s):  
Detailed Analysis ◽  
Economic Model ◽  
Jewish Law ◽  
Biblical Law ◽  
The Law ◽  
The Right

This article focuses on the law surrounding the biblical law of theft. According to Jewish Law, a thief who is caught and found guilty must return the stolen article and, in addition, pay the owner a fine equal to the value of the article. The thief can avoid this fine by admitting to the theft on his own initiative in a court and returning the stolen article to its owner. This article refers to such canceling of a fine as a pardon. The pardon is explained in the Talmud by the legal dictum “Mode BeKnass Patur,” that is “he who confesses in a fine is exempt”. This article carefully explains economic model with the help of various graphs. This article also explains two issues which require consideration in assessing whether Eliezer acted properly as an agent according to Jewish law. A detailed analysis of concepts of duty in Judaism concludes this article.

Asymmetry of tymbal action and structure in a cicada: a possible role in the production of complex songs

1998 ◽  
Vol 201 (5) ◽  
pp. 717-730 ◽  
Author(s):  
P J Fonseca ◽  
H-C Bennet Clark
Keyword(s):  
Peak Power ◽  
Transfer Functions ◽  
Sound Radiation ◽  
Abdominal Sternite ◽  
Honest Signal ◽  
Morphological Asymmetry ◽  
Complex Song ◽  
The Right ◽  
Sound Pulses

The type 1 echeme of the song of the small European cicada Tympanistalna gastrica consists of a pair of loud IN-OUT pulses followed by a train of soft IN-OUT pulses. In all nine insects investigated, the right and left tymbals buckled inwards and outwards alternately, but the echeme started with the buckling of the right tymbal. Both the inward and the outward buckling movements produced single discrete sound pulses. &lt;P&gt; The loud IN pulses were produced with the tymbal tensor muscle relaxed. They were approximately 10 dB louder than the loud OUT pulses and than the soft IN and OUT pulses. The period between the right loud IN and OUT pulses (3.75+/-0.31 ms) (mean +/- s.d.) was significantly shorter than between the left loud IN and OUT pulses (4.09+/-0.28 ms). The period between the loud IN and OUT pulses was significantly shorter than the period between the soft IN and OUT pulses, which was similar on both sides (mean for the right tymbal 5.54+/-0.20 ms, mean for the left tymbal 5.30+/-0.51 ms). &lt;P&gt; Measured at the tymbal, the power spectrum of the right loud IN pulses showed major components between 4 and 8 kHz as well as around 11.7 kHz. That of the left loud IN pulse had approximately 10 dB less power at 4 kHz and similar power at 7-8 kHz, with a further louder peak at around 10.8 kHz. The loud OUT pulses and all subsequent IN and OUT soft pulses showed very little power at 4 and 8 kHz, but all showed a spectral peak at approximately 13 kHz. The soft OUT pulses had similar pulse envelopes to the preceding IN pulses, which they closely mirrored. &lt;P&gt; Measured at the fourth abdominal sternite, only the right loud IN pulse produced peak power at 4 kHz. The transfer function between the tymbal sound and that at sternite 4 was maximal at 4 kHz for the right loud IN pulse and showed a peak at this frequency for both loud and soft IN and OUT pulses. The 4 kHz components of all pulses, and particularly that of the right loud IN pulse, which has the loudest 4 kHz component, excited sympathetic sound radiation from the abdominal sternite region. &lt;P&gt; Measured at the tympanal opercula, both loud IN pulses produced peaks at 7-8 kHz of similar power. The transfer functions between the tymbal sound and that at the tympanal opercula showed peaks of power at this frequency range for both loud and soft IN and OUT pulses, suggesting that this component excites sympathetic radiation via the tympana. &lt;P&gt; Components of the sound pulses produced by one tymbal are also transmitted via the contralateral tymbal. The pulses transmitted during both loud IN pulses had ragged envelopes, but the soft IN pulses and all OUT pulses were transmitted as clean coherent pulses with slow build-up and slow decay, suggesting that the ipsilateral tymbal excited a sympathetic resonance in the contralateral one. &lt;P&gt; The tymbals of T. gastrica have two unusual features. At the dorsal end of rib 2, there is a horizontal bar that extends anteriorly over rib 3 and posteriorly over rib 1 to the dorsal end of the tymbal plate. This bar appears to couple the three ribs so that they buckle in unison. The resilin sheet at the ventral ends of ribs 1, 2 and 3 was significantly wider, dorso-ventrally, in the right tymbal than in the left in eight insects that were measured (mean right-to-left ratio, 1.37). &lt;P&gt; The asymmetry between the right and left loud IN pulses correlates with the morphological asymmetry of the tymbals. The complexities of the song in T. gastrica appear to result from the preferential excitation of sound radiation from the abdomen surface or via the tympana by components of the distinct pulses produced by the asymmetrical tymbals and from the tymbals themselves. &lt;P&gt; Moribund or fatigued insects were successively unable to produce the right loud pulse and then the left loud pulse. The complex song may in this way act as an honest signal of male fitness.

McHugh and Singh Re-create the Scene of Peppy’s Death

2020 ◽  
pp. 117-118
Author(s):  
Peter H. Reid
Keyword(s):  
Detailed Analysis ◽  
Noise Level ◽  
Defense Attorney ◽  
The Right

In May 1966, Dr. McHugh and Bill’s defense attorney, Gurbachan Singh, travel to Maswa, visit the scene of Peppy’s death, and, based on their survey of the area, prepare a detailed analysis of how Peppy’s injuries would likely have occurred. McHugh first notes the “omnipresent” wind in the area, which he had experienced on previous visits to Maswa. He thinks the wind’s noise level might have been loud enough to keep Bill from hearing Peppy’s fall. With Singh standing in Peppy’s place, behind Bill and to the right (according to Byron Georgiadis, there was insufficient room on the rock for them to stand side by side), and McHugh in the place where Bill stood, as described by Bill, McHugh assesses whether Bill would see Peppy fall. The documents produced from this research will become vital as the defense prepares its case.

scholarly journals White-matter integrity and hearing acuity decline in healthy subjects: Magnetic resonance tractography

2020 ◽  
Vol 33 (3) ◽  
pp. 236-243
Author(s):  
Fahad H Alhazmi
Keyword(s):  
Hearing Loss ◽  
White Matter ◽  
Pure Tone ◽  
Structural Connectivity ◽  
Normal Hearing ◽  
Anxiety And Depression ◽  
Healthy Population ◽  
Hearing Acuity ◽  
The Right ◽  
Moderate Hearing Loss

Aim The association between hearing acuity and white-matter (WM) microstructure integrity was evaluated in a normal healthy population with a variety of hearing acuity using an automated tractography technique known as TRACULA (TRActs Constrained by UnderLying Anatomy) in order to investigate whether hearing acuity decline is correlated with brain structural connectivity. Methods Forty healthy controls were recruited to this study, which used a Siemens 3T Trio with a standard eight-channel head coil. Hearing acuity was assessed using pure-tone air conduction audiometry (Amplivox 2160, with Audiocups to eliminate noise and allow accurate pure-tone audiometry). Handedness and anxiety and depression were assessed for all participants in this study using the Edinburgh Handedness Inventory and the Hospital Anxiety and Depression Scale, respectively. Results This study showed a significant reduction in WM volume of the left cingulum angular bundle (CAB; t = 2.32, p = 0.02) in the mild to moderate hearing-loss group (238 ± 223 mm2) compared to the group with normal hearing (105  ± 121 mm2). The WM integrity of the left CAB was found to be significantly different ( t = 2.06, p = 0.04) in the mild to moderate hearing-loss group (0.18 ± 0.06 mm2/s) compared to the group with normal hearing (0.22 ± 0.05 mm2/s). The WM integrity of the left anterior thalamic radiation (ATR) was found to be significantly different ( t = 2.58, p = 0.014) in the mild to moderate hearing-loss group (0.33 ± 0.05 mm2/s) compared to the group with normal hearing (0.37 ± 0.03 mm2/s). A significant negative correlation was found between age and the WM integrity of the right ATR ( r = −0.33, p = 0.038), and between hearing acuity and the WM integrity of the right ATR ( r = −0.38, p = 0.013) and left CAB ( r = −0.36, p = 0.019). Discussion and conclusion: An important finding in this study is that brain structural connectivity changes in the left hemisphere seem to be associated with age-related hearing loss found mainly in the ATR and CAB tracts.

scholarly journals Eros and Psyche on the Medallions of Silver Bowls from Sadovy Kurgan: New Data

2019 ◽  
pp. 75-85
Author(s):  
Boris Raev
Keyword(s):  
Detailed Analysis ◽  
Eastern Mediterranean ◽  
Spherical Shape ◽  
Inner Surface ◽  
Eros And Psyche ◽  
The Right ◽  
Made In

The set of eight silver bowls excavated in Sadovy kurgan at the urban outskirts of Novocherkassk in 1962 includes a pair of bowls with medallions depicting scenes with Eros and Psyche. The detailed analysis of the element of the feathery pattern that covers the entire inner surface of the bowls reveals that it was applied by different craftsmen, though the bowls themselves were no doubt made in the same workshop. The central figures of the scenes on both medallions are tied to the columns decorated with garlands, on which one can see vessels. Both vessels have a spherical shape; each has a low stand and conical cover, and are the type of turibulum. One of the vessels bears a figure detail soldered to the right upper part of the vessel’s body. The second figure, soldered to the left side, is visible less clearly (fig. 2,2). The described figures look like protomes of griffins on a turibulum. A similar vessel was found in Khokhlach kurgan, and belongs to the objects produced in the 2nd – 1st centuries BC. We conclude that the identified similarity on manufacturing medallions on the bowls from Sadovy kurgan and the turibulum from Khokhlach kurgan most likely relates the finds to the workshops of the same region, probably the Eastern Mediterranean.

scholarly journals Resonators in insect sound production: how insects produce loud pure-tone songs

1999 ◽  
Vol 202 (23) ◽  
pp. 3347-3357 ◽  
Author(s):  
H.C. Bennet-Clark
Keyword(s):  
Pure Tone ◽  
Sound Production ◽  
Slow Muscle ◽  
Frequency Multiplier ◽  
Contraction Rate ◽  
Mechanical Resonator ◽  
Second Stage ◽  
Different Types ◽  
Song Frequency ◽  
Slow Contraction

In a resonant vibration, two reactive elements, such as a mass and a spring, interact: the resonant frequency depends on the magnitude of these two elements. The build-up and decay of the vibration depend on the way the resonator is driven and on the damping in the system. The evidence for the existence of resonators in insect sound production is assessed. The mechanics of different types of sound-producing system found in insects is described. Mechanical frequency-multiplier mechanisms, which convert the relatively slow contraction of muscles to the higher frequency of the sound, are commonly used to convert the comparatively slow muscle contraction rate to the higher frequency of the sound. The phasing and rate of mechanical excitation may also affect the frequency and duration of the sound that is produced. Although in many insects the song may appear to be produced by the excitation of a simple resonator, the song frequency may not be constant, suggesting that other factors, such as the mechanism of excitation, or variation of the effective mass or elasticity of the system during sound production, may be additional determinants of the song frequency. Loud, and hence efficient, transduction of the energy of a mechanical resonator into sound may involve a second stage of transduction which, by damping the resonator, may compromise tonal purity. Some insect singers resolve this problem by tuning both stages of transduction to the same frequency, thereby maintaining tonal purity.

scholarly journals HEARING EVALUATION OF NIGERIAN PRISON INMATES: A CROSS-SECTIONAL SURVEY

2020 ◽  
Vol 14 (2) ◽  
pp. 106-114
Author(s):  
Abdullahi Musa Kirfi ◽  
◽  
Mohammed Bello Fufore ◽  
Garba Mohammed Mainasara ◽  
Abdulrazak Ajiya ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Pure Tone ◽  
Hearing Threshold ◽  
Pure Tone Audiometry ◽  
Control Group ◽  
Prison Inmates ◽  
Impaired Hearing ◽  
Cross Sectional ◽  
The Mean ◽  
The Right

Background: Prisoners, due to confinement are isolated from contact with the society and access to many of the facilities, including medical care. This study aimed to evaluate the hearing threshold of inmates of Kaduna convict prison. Method: It was a cross-sectional study of prison inmates at the Kaduna convict prison between April 2017 and February 2019. Ethical approvals were obtained from relevant bodies and all consented inmates aged 18 – 55years in the Kaduna convict prison were enrolled. Equal number of control matched for age and gender were enrolled from the communities in Kaduna North Local Government Area. Data were collated using a structured questionnaire. A diagnostic Pure Tone Audiometry was performed to assess their hearing threshold. Statistical Package for Social Sciences (SPSS) version 20.0 was used for analysis. Results: Four hundred and thirty inmates and equal number of control group were enrolled. The mean age for the inmates and controls were 30.2±7.5 and 30.4±8.02 years respectively. There were 383 males and 47 females in both groups. Among the 860 ears of the inmates, 238(27.7%) ears had hearing loss while in the control group, 95/ (11.1%) ears had impaired hearing. Conductive hearing loss was the commonest among the inmates 111(46.6%) while sensorineural was commoner among the controls 57(60.0%). The mean pure tone average among the inmates was 25.6±11.3dBHL and 26.1±11.2dBHL on the right and left ears respectively while in the control group, it was 18.4±7.8dBHL on the right and 17.9±7.9dBHL on the left. Conclusion: This study revealed that hearing loss was more prevalent among prison inmates than the general population. In majority of the inmates, the hearing loss was mild, conductive and mostly affecting all the frequencies.

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