Echolocation call structure and intensity in five species of insectivorous bats.

1995 ◽  
Vol 198 (2) ◽  
pp. 475-489 ◽  
Author(s):  
D A Waters ◽  
G Jones
Keyword(s):  
Energy Flux ◽  
Escape Response ◽  
Free Flight ◽  
Echolocation Call ◽  
Constant Frequency ◽  
Insectivorous Bats ◽  
Call Structure ◽  
Low Intensity ◽  
Energy Flux Density ◽  
Rms Amplitude

Echolocation call intensity was measured in the laboratory for five species of British insectivorous bats in free flight and in the hand. All species showed similar call intensities of between 80 and 90 dB peSPL (peak equivalent SPL) at 1 m during flight except Plecotus auritus, whose call intensity was between 68 and 77 dB peSPL at 1 m. Calls from stationary bats were about 13 dB less intense than calls during flight. A method is proposed to measure the root mean square (rms) amplitude of echolocation calls and, hence, to calculate the energy flux density of the call. The constant-frequency calls of Rhinolophus hipposideros have energy flux densities approximately ten times higher than those of bats using frequency-modulated calls as a result of their longer durations and lower crest factors. It is argued that the low-intensity calls of P. auritus allow it to approach tympanate moths more closely before triggering their escape response.

079 Low-intensity shockwave therapy for erectile dysfunction: the effect of energy flux density level and frequency of sessions per week

2018 ◽  
Vol 15 (7) ◽  
pp. S159
Author(s):  
D. Kalyvianakis ◽  
E. Memmos ◽  
I. Mykoniatis ◽  
P. Kapoteli ◽  
M. Tsiouprou ◽  
...  
Keyword(s):  
Erectile Dysfunction ◽  
Flux Density ◽  
Energy Flux ◽  
Density Level ◽  
Shockwave Therapy ◽  
Low Intensity ◽  
Energy Flux Density

The relationship between echolocation-call frequency and moth predation of a tropical bat fauna

2006 ◽  
Vol 84 (3) ◽  
pp. 425-433 ◽  
Author(s):  
C R Pavey ◽  
C J Burwell ◽  
D J Milne
Keyword(s):  
Peak Frequency ◽  
Light Traps ◽  
Echolocation Call ◽  
Constant Frequency ◽  
Low Intensity ◽  
High Duty Cycle ◽  
Strong Positive Relationship ◽  
Tropical Australia ◽  
Hearing Range ◽  
The Relationship

The allotonic frequency hypothesis proposes that the proportion of eared moths in the diet should be highest in bats whose echolocation calls are dominated by frequencies outside the optimum hearing range of moths i.e., <20 and >60 kHz. The hypothesis was tested on an ecologically diverse bat assemblage in northern tropical Australia that consisted of 23 species (5 families, 14 genera). Peak frequency of signals of bats within the echolocation assemblage ranged from 19.8 to 157 kHz but was greatest between 20 and 50 kHz. A strong positive relationship existed between peak call frequency and percentage of moths in the diet for a sample of 16 bats from the assemblage representing 13 genera (R2 = 0.54, p = 0.001). The relationship remained strong when the three species with low-intensity calls were excluded. When the two species with high duty cycle, constant-frequency signals were removed, the relationship was weaker but still significant. In contrast to previous research, eared moths constituted only 54% of moth captures in light traps at bat foraging grounds, and eared moths were significantly larger than non-eared individuals. These results show that the pattern of moth predation by tropical bats is similar to that already established for bat faunas in subtropical and temperate regions.

scholarly journals Waves in Microstructured Conducting Sheath Helix Embedded Optical Guides with Chiral Nihility and Chiral Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
N. Iqbal ◽  
M. A. Baqir ◽  
P. K. Choudhury
Keyword(s):  
Boundary Conditions ◽  
Flux Density ◽  
Energy Flux ◽  
Pitch Angle ◽  
Electromagnetic Waves ◽  
The Core ◽  
Dispersion Behavior ◽  
Chiral Materials ◽  
Energy Flux Density

The paper deals with the sustainment of electromagnetic waves in circularly cylindrical optical guide with chiral nihility and chiral materials in the core and the clad sections, respectively. A perfectly conducting tightly wound helix is introduced at the core-clad interface. The eigenvalue relation for such a complex optical microstructured guide is deduced by applying suitable boundary conditions at the core-clad interface, and the dispersion behavior is analyzed by varying the pitch angle of helix. The sustainment of energy flux density in such optical guides is estimated under various structural conditions, and the density patterns in core-clad sections are anatomized analytically.

Activity patterns and habitat preferences of insectivorous bats in a West African forest–savanna mosaic

2004 ◽  
Vol 20 (4) ◽  
pp. 397-407 ◽  
Author(s):  
Christoph F. J. Meyer ◽  
Christian J. Schwarz ◽  
Jakob Fahr
Keyword(s):  
Open Space ◽  
Activity Patterns ◽  
Habitat Preferences ◽  
Light Trap ◽  
Negative Influence ◽  
Foraging Activity ◽  
The Moon ◽  
Constant Frequency ◽  
Insectivorous Bats ◽  
Bat Activity

We studied activity patterns and habitat use by insectivorous bats in Comoé National Park, Ivory Coast. Bat foraging activity was quantified along five transects representing three different habitat types using acoustic monitoring and captures with mist nets and harp traps. Aerial insect abundance was assessed using a light trap; in addition shrub and tree arthropods were sampled. Bat activity was significantly and positively related to insect availability and ambient temperature, whereas increased visibility of the moon had a negative influence on flight activity. Together, these factors best explained both total bat activity and activity of bats hunting in open space and edge habitats. The interaction between temperature and light intensity was the best predictor of activity by species foraging in obstacle-rich forest habitats, however, the regression model had a low predictive value. Overall, a large proportion (c. 50%) of the variation in bat activity appeared to be a consequence of transect- and/or habitat-specific influences. We found a significant non-linear relationship between the activity of QCF (quasi-constant frequency) and FM–QCF (frequency modulated – quasi-constant frequency) bats and the phase of the moon, with lowest levels of activity occurring near full moon. We interpret this lunar-phobic behaviour as a reflection of a higher predation risk during moonlit periods. For FM (steep frequency modulated) and CF (constant frequency) bats, no significant correlation was found, although there was a trend suggesting that these bats at least were not negatively affected by bright moonlight. Foraging activity of bats was positively correlated with the abundance of atympanate moths; however, no such correlation was found for tympanate moths.

HYGIENIC ASSESSMENT OF ELECTROMAGNETIC RADIATION LEVELS OF BASE STATIONS,INSTALLED ON THE ROOFS OF BUILDINGS AND THE TERRITORY OF LAND PLOTS IN TASHKENT

2021 ◽  
Vol 2 (5) ◽  
pp. 5-11
Author(s):  
G. A. Tashpulatova ◽  
◽  
A. N. Krasavin
Keyword(s):  
Public Health ◽  
Electromagnetic Radiation ◽  
Flux Density ◽  
Energy Flux ◽  
Mobile Communications ◽  
Base Station ◽  
Base Stations ◽  
Cellular Communications ◽  
Measurement Results ◽  
Energy Flux Density

This article is about instrumental measurements of the FR EMR energy flux density. The measurement results were analyzed with the division of the data obtained by the purpose of buildings and the height of the antenna equipment placement, a hygienic assessment of the RF EMR levels created by the equipment of base stations of cellular communications, installed on the roofs of residential and public buildings and adjacent territories of Tashkent is given. A proposal is made on the rational placement of radio engineering facilities.Keywords:electromagnetic field; electromagnetic safety; base station for mobile communications; protection of public health; sanitary supervision

scholarly journals Low intensity Extra Corporeal Shock Wave Therapy in Patients with Erectile Dysfunction: Our experience in ACKU

2020 ◽  
Vol 23 (2) ◽  
pp. 176-180
Author(s):  
Md Fazal Naser ◽  
Mahmood Hasan ◽  
Md Waliul Islam ◽  
Tajkera Sultana Chowdhury ◽  
Md Shohrab Hossain
Keyword(s):  
Erectile Dysfunction ◽  
Erectile Function ◽  
Treatment Protocol ◽  
Phosphodiesterase Inhibitors ◽  
Shockwave Therapy ◽  
Low Intensity ◽  
Weekly Session ◽  
Linear Probe ◽  
Study Population ◽  
Energy Flux Density

Introduction: Oral 5-phosphodiesterase inhibitors (PDE5-I) is the main therapeutical options in erectile dysfunction (ED). It shows good results, but non-responders lack other effective options and its effect is also not long lasting. Since last few years, low-intensity extracorporeal shockwave therapy (Li-ESWT) in the corpora cavernosa showing promising results. This article presents our early experiences in Advanced Center of Kidney disease and Urology (ACKU) with the aim to evaluate clinical efficacy of Li-ESWT. Materials and methods: Thirty four patients with ED were prospectively included in the study during the period of January 2018 to Jun 2019.Treatment was performed using the PiezoWave2 (Richard Wolf, Germany) device with a linear probe. Treatment protocol included a weekly session for four weeks. Each session delivered 2000 shocks on the perineum plus 4000 shocks on dorsum penis with an energy flux density (EFD) of 0.160 mJ/mm2. Every patient has been re-evaluated 1.5 and 3 months after the last session. Pre- and post-procedure International Index Erectile Function – Erectile function domain (IIEF-EF) score, Erection Hardness Score (EHS) and Global Assessment Questionnaire-Question 1 (GAQ-Q1) answers were obtained. Results: Mean age of the study population was 39.4 (±12.9) years, 35.29% diabetic, 20.59% with hypertension and 55.85% smokers. Mean baseline IIEF-EF was 14.6, at 6 week post LiSWT was 16.4 (p >0.05) and at 3 months post LiSWT was 19.2 (p < 0.05). EHS was significantly improved at 3 month in comparison to baseline (p<0.05). 20.59% patients answered positively to GAQ-Q1 at 6 week and 61.76% at 3 months. IIEF-EF score change of >5 and increase of EHS >2 were observed in 62.88% and 70.59% study subjects respectively. Conclusions: Li-ESWT is a safe, harmless and repeatable treatment tool for ED with good outcomes reported. Bangladesh Journal of Urology, Vol. 23, No. 2, July 2020 p.176-180

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