Solar bursts as can be observed from the lunar farside with a single antenna at very low frequencies
Sign Up to like & getrecommendations! Published in 2018 at "Astronomische Nachrichten"
DOI: 10.1002/asna.201813522
Abstract: Earth-based observations are complicated by the opacity of Earth's ionosphere at very low frequencies and strong man-made radio frequency interference. This explains long standing interest in building a low frequency radio telescope on the farside… read more here.
Keywords: single crossed; solar bursts; low frequencies; radio telescope ... See more keywords
A remark on Pólya’s conjecture at low frequencies
Sign Up to like & getrecommendations! Published in 2018 at "Archiv der Mathematik"
DOI: 10.1007/s00013-018-1258-x
Abstract: We show that the Faber–Krahn inequality implies Pólya’s conjecture for eigenvalues $$\lambda _{k}$$λk of the Dirichlet Laplacian in $$\mathbb {R}^n$$Rn up to $$k = \lfloor b(n) \rfloor $$k=⌊b(n)⌋, where b(n) is a function with exponential… read more here.
Keywords: low frequencies; conjecture low; conjecture; remark lya ... See more keywords
Hall-coupling of Slow and Alfvén Waves at Low Frequencies in the Lower Solar Atmosphere
Sign Up to like & getrecommendations! Published in 2019 at "Solar Physics"
DOI: 10.1007/s11207-019-1544-1
Abstract: The Hall effect due to weak ionization in the lower solar atmosphere is shown to produce significant coupling between slow magneto-acoustic and Alfven waves, especially in highly inclined magnetic fields, and even at low frequencies… read more here.
Keywords: alfven waves; lower solar; low frequencies; solar atmosphere ... See more keywords
Vibration assisted drilling of CFRP/metal stacks at low frequencies and high amplitudes
Sign Up to like & getrecommendations! Published in 2018 at "Production Engineering"
DOI: 10.1007/s11740-018-0818-z
Abstract: In many applications of automotive and aircraft industries the use of material combinations such as compound materials made from carbon fiber reinforced plastics (CFRP) and metal materials like steel, titanium or aluminum alloys is significantly… read more here.
Keywords: assisted drilling; low frequencies; metal stacks; cfrp metal ... See more keywords
Numerical analyses of the sound transmission at low frequencies of a calibrated Insulating Glazing Unit
Sign Up to like & getrecommendations! Published in 2021 at "Applied Acoustics"
DOI: 10.1016/j.apacoust.2021.108065
Abstract: Abstract The acoustic performances of building elements such as windows are carried out in laboratory according to standards. In addition to the high cost of the experimental tests, the measurements at low frequencies face some… read more here.
Keywords: low frequencies; analyses sound; glazing unit; numerical analyses ... See more keywords
Spontaneous catastrophe behaviour in acoustic black holes at low frequencies
Sign Up to like & getrecommendations! Published in 2021 at "Applied Acoustics"
DOI: 10.1016/j.apacoust.2021.108109
Abstract: Abstract In acoustic black holes (ABH) at low frequencies, catastrophe sound energy flux behaviour occurs spontaneously if the tip size of the ABHs reaches a critical value. This report demonstrates that this catastrophe behaviour can… read more here.
Keywords: catastrophe behaviour; low frequencies; black holes; spontaneous catastrophe ... See more keywords
Features of structure, magnetic state and electrodynamic performance of SrFe12−xInxO19
Sign Up to like & getrecommendations! Published in 2021 at "Scientific Reports"
DOI: 10.1038/s41598-021-97684-8
Abstract: Indium-substituted strontium hexaferrites were prepared by the conventional solid-phase reaction method. Neutron diffraction patterns were obtained at room temperature and analyzed using the Rietveld methods. A linear dependence of the unit cell parameters is found.… read more here.
Keywords: state; low frequencies; towards low; shifts towards ... See more keywords
Elite suppressors have low frequencies of intact HIV-1 proviral DNA.
Sign Up to like & getrecommendations! Published in 2019 at "AIDS"
DOI: 10.1097/qad.0000000000002474
Abstract: : Elite controllers or suppressors (ES) control viral replication without antiretroviral therapy (ART). We used the intact proviral DNA assay to approximate the size of the inducible latent reservoir in ES and found that while… read more here.
Keywords: low frequencies; dna; frequencies intact; suppressors low ... See more keywords
Modified Wideband Acoustical Holography for Improving the Identification of Acoustic Sources at Low Frequencies
Sign Up to like & getrecommendations! Published in 2023 at "IEEE Access"
DOI: 10.1109/access.2023.3243159
Abstract: Source identification and sound field reconstruction using near-field acoustical holography (NAH) is particularly challenging when the measurement data are relatively fewer than the sources to reconstruct. Fast wideband acoustical holography (WBH) is an inverse solution… read more here.
Keywords: wideband acoustical; holography; identification; acoustical holography ... See more keywords
Achieving Reliable and Repeatable Electrochemical Impedance Spectroscopy of Rechargeable Batteries at Extra-Low Frequencies
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Transactions on Instrumentation and Measurement"
DOI: 10.1109/tim.2022.3180429
Abstract: There is a need for techniques for efficient and accurate measurement of the impedance of rechargeable batteries at extra-low frequencies (ELFs, of the order of microhertz), as these reflect real usage and cycling patterns, and… read more here.
Keywords: extra low; rechargeable batteries; spectroscopy; batteries extra ... See more keywords
Nonlinear frequency dependence of sound attenuation in sea bottoms at low frequencies
Sign Up to like & getrecommendations! Published in 2017 at "Journal of the Acoustical Society of America"
DOI: 10.1121/1.5014598
Abstract: In the 1980s, several papers were published that stressed the importance of non-linear frequency dependence (NLFD) of sound attenuation in marine sediments al low frequencies, and showed experimental evidence that the NLFD can have a… read more here.
Keywords: low frequencies; frequency dependence; frequency; sound attenuation ... See more keywords