The Mac
@TheMac
22 June, 09:44
delta2
/ˈdɛltə/
noun: delta; plural noun: deltas
a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets.
"the Nile delta"
noun: delta; plural noun: deltas
1.
the fourth letter of the Greek alphabet ( Δ, δ ), transliterated as ‘d’.
BRITISH
a fourth-class mark given for an essay, examination paper, or other piece of work.
the fourth in a series of items, categories, etc.
modifier noun: delta
"delta hepatitis"
/ˈdɛltə/
noun: delta; plural noun: deltas
a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets.
"the Nile delta"
noun: delta; plural noun: deltas
1.
the fourth letter of the Greek alphabet ( Δ, δ ), transliterated as ‘d’.
BRITISH
a fourth-class mark given for an essay, examination paper, or other piece of work.
the fourth in a series of items, categories, etc.
modifier noun: delta
"delta hepatitis"
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The Mac
@TheMac
23 June, 03:58
In response Cord Archangel to his Publication
D
E
F
EN
D
IN
G
E
F
EN
D
IN
G
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The Mac
@TheMac
23 June, 04:00
In response The Mac to his Publication
deafening (comparative more deafening, superlative most deafening)
Loud enough to cause temporary or permanent hearing loss.
(hyperbolic) Very loud.
Derived terms
deafening silence
Loud enough to cause temporary or permanent hearing loss.
(hyperbolic) Very loud.
Derived terms
deafening silence
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The Mac
@TheMac
23 June, 04:02
In response The Mac to his Publication
AS HEARING LOSS
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The Mac
@TheMac
23 June, 04:04
In response The Mac to his Publication
DNA shearing is an experimental process used to prepare DNA for analysis or other processing by the use of mechanical instruments to randomly cleave DNA. DNA is sheared to the desired fragment range. For instance, physical shearing can be done by probe sonication and nebulization.
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The Mac
@TheMac
23 June, 04:06
In response The Mac to his Publication
During sonication, DNA samples are subjected to hydrodynamic shearing by exposure to brief periods of sonication.
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The Mac
@TheMac
23 June, 04:10
In response The Mac to his Publication
Sonication, a type of hydrodynamic shearing, subjects DNA to acoustic cavitation and hydrodynamic shearing by exposure to brief periods of sonication, usually resulting in 700bp fragments. ... The DNA pass through a gauge needle several times to physically tear the DNA into fine pieces.
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The Mac
@TheMac
23 June, 04:11
In response The Mac to his Publication
Acoustic cavitation, in simple terms, is the growth and collapse of preexisting microbubbles under the influence of an ultrasonic field in liquids. The cavitation bubbles can be characterized by the dynamics of oscillations and the maximum temperatures and pressures reached when they collapse.
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The Mac
@TheMac
23 June, 04:12
In response The Mac to his Publication
Ulrasound is sound that have high pitched for the human ear to hear and is out of human audible range. Ultrasonic is an adjective which is used to describe a sound as being an ultrasound.
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The Mac
@TheMac
23 June, 04:14
In response The Mac to his Publication
Fig. 1: (A) Geometry of a linear ultrasonic array. Each element face has area w X h and the elements are spaced by p. (B) Geometry of rotated linear array
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The Mac
@TheMac
23 June, 04:20
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:24
In response The Mac to his Publication
Reading between the lines.
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The Mac
@TheMac
23 June, 04:26
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:29
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:29
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:29
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:30
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:30
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:30
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:31
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:31
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:33
In response The Mac to his Publication
In this paper the concept of the metamaterial is explained. Using the interaction between the seismic (Rayleigh) wave and the ground-forest system the phenomena of wave stop is clarified. The example of ‘seismic metamaterial’ in architecture is also shown. The subunit of metamaterial is modeled as a mass-in-mass system. On the mass 1 a small mass with linear elastic spring is connected. The resonance conditions for the two-degrees of freedom system excited with a periodical trigonometric force are obtained. The term of effective mass is introduced. The effect of the negative effective mass on excitation wave spread is shown.
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The Mac
@TheMac
23 June, 04:34
In response The Mac to his Publication
The real metamaterial subunit is made of a metal sphere surrounded with rubber on which a thin silicon layer is settled. The change of vibration direction of the core in comparison to the outside layer and wave give the transformation from the positive to negative effective mass. The subunit has only one very narrow frequency band gap. In the paper we considered the subunit with nonlinear elastic connection between basic and added masses. Namely the added mass with nonlinear spring acts as a nonlinear vibration absorber. If the excitation has the form of the Jacobi elliptic function and the nonlinear spring property is a cubic function of deflection the solution the frequency of vibration of the system depends on the amplitude of vibration.
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The Mac
@TheMac
23 June, 04:34
In response The Mac to his Publication
For certain parameters of the excitation function, the calculated parameters of spring have to be used. It means that the properties of absorber have to be choosing in accordance with excitation parameters. The obtained frequency band gap for frequencies is larger for the nonlinear than for the linear subsystem. The realization of metamaterials by using the subunits incorporated in the basic material or honeycomb structure is shown. The metamaterials are not natural but artificial materials usually composites. The explanation of acoustic metamaterial in noise reduction is considered. The metamaterial produced at the University of Novi Sad, Serbia, is experimentally tested at the Laboratory of Nuclear Sciences in Bucharest, Romania. The experimental rig is shown. The obtained results of energy variation in the metamaterial excited with the white noise are plotted. The results are in a good agreement with theoretically obtained ones.
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The Mac
@TheMac
23 June, 04:35
In response The Mac to his Publication
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The Mac
@TheMac
23 June, 04:36
In response The Mac to his Publication
Noun
metamaterial (plural metamaterials)
(engineering, physics) any material that obtains its electromagnetic properties from its structure rather than from its chemical composition; especially a material engineered to have features of a size less than that of the wavelength of a class of electromagnetic radiation
metamaterial (plural metamaterials)
(engineering, physics) any material that obtains its electromagnetic properties from its structure rather than from its chemical composition; especially a material engineered to have features of a size less than that of the wavelength of a class of electromagnetic radiation
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Cheryl Jaser
@Cheryl555
23 June, 04:38
In response The Mac to his Publication
does this have anything to do with whats in the jabs
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The Mac
@TheMac
23 June, 04:46
In response Cheryl Jaser to his Publication
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great article. thsnk you. but the article sounds like their is to cure disease. the shots seem to be the opposite. I wish I paid more attention in science class. your stuff is so intriging
07:00 PM - Jun 23, 2021
In response The Mac to his Publication
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