The Mac
@TheMac
07 November, 06:40
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The Mac
@TheMac
07 November, 06:41
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:43
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:44
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:46
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:52
In response The Mac to his Publication
Metamaterials and Transformation Optics
Metamaterials may be classified into two categories: LSPR-based and non-LSPR metamaterials. LSPR-based metamaterials such as negative index metamaterials rely upon LSPR phenomenon and hence the best performing plasmonic materials are noble metals followed by metal nitrides, further followed by TCOs (Tassin et al., 2012). Non-LSPR metamaterials rely upon effective medium behavior of composite materials and examples are cloaks, hyperbolic metamaterials, and epsilon-near-zero (ENZ) materials. As a general note, most of the metamaterial implementations of transformation optics fall into the category of non-LSPR metamaterials. Such metamaterials benefit a lot from alternative plasmonic materials because of their smaller Im{εm}.
Metamaterials may be classified into two categories: LSPR-based and non-LSPR metamaterials. LSPR-based metamaterials such as negative index metamaterials rely upon LSPR phenomenon and hence the best performing plasmonic materials are noble metals followed by metal nitrides, further followed by TCOs (Tassin et al., 2012). Non-LSPR metamaterials rely upon effective medium behavior of composite materials and examples are cloaks, hyperbolic metamaterials, and epsilon-near-zero (ENZ) materials. As a general note, most of the metamaterial implementations of transformation optics fall into the category of non-LSPR metamaterials. Such metamaterials benefit a lot from alternative plasmonic materials because of their smaller Im{εm}.
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The Mac
@TheMac
07 November, 06:54
In response The Mac to his Publication
Hoffman et al. showed negative refraction at an operating wavelength of 8 µm in a so-called hyperbolic metamaterial consisting of planar, alternating layers (a superlattice) of heavily doped (1–4×1018 cm−3) In0.53Ga0.47As and undoped Al0.48In0.52As deposited by MBE (Hoffman et al., 2007). This metamaterial device was shown to have a performance figure-of-merit of about 20, the highest reported so far. Yet another demonstration is the epsilon-near-zero (ENZ) properties of the InAsSb material when doped heavily. Adams et al. show that heavy doping (1–2×1019 cm−3) of InAsSb causes the real permittivity to cross zero and turn metal-like in the MIR range (Adams et al., 2011). At the zero cross-over of real permittivity (occurring at about 8 µm wavelength), the material behaves as an ENZ material and exhibits special properties such as photon funneling.
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The Mac
@TheMac
07 November, 06:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 06:55
In response The Mac to his Publication
In the near-IR, Kim et al. showed ENZ property of TCO substrates pin the resonance of gold nanorods always to ENZ wavelength irrespective of their geometry (Kim et al., 2016). Naik et al. demonstrated highest performing hyperbolic metamaterial in the near-infrared using Al-doped ZnO and undoped ZnO alternating layers (Naik et al., 2012a). The figure-of-merit of this hyperbolic metamaterial was nearly 10 while similar noble-metal based structures have 3 orders of magnitude smaller figures-of-merit. The implication of this demonstration is that TCO-based metamaterials are best suited for applications such as hyperlens – a sub-diffraction imaging metamaterial device.
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The Mac
@TheMac
07 November, 06:57
In response The Mac to his Publication
In the visible spectral range, TiN based metamaterials have been demonstrated. In an example of a metamaterial for quantum optical applications, Naik et al. developed an epitaxial metal/dielectric superlattice based on TiN and AlN, and showed that the structure exhibits hyperbolic dispersion (Naik et al., 2014). Layer thickness down to 5 nm – not possible with noble metals – was possible in TiN based metamaterial only because the surface energy of TiN is nearly 3 orders of magnitude smaller than that of noble metals.
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The Mac
@TheMac
07 November, 07:00
In response The Mac to his Publication
Such a metamaterial showed a huge enhancement in local photonic density of states, and a fluorophore probe near such metamaterial experienced about 80x enhancement in its radiative decay rate. Such huge enhancement in photon emission rate is useful in many light emitting devices including a single photon source for quantum optical applications. Shalaginov et al. extended this work to demonstrate fast single photon emission from NV centers of nano-diamonds (Shalaginov et al., 2013).
Overall, alternative plasmonic materials are very promising for non-LSPR metamaterials owing to their smaller magnitude of real permittivity and small imaginary permittivity.
Overall, alternative plasmonic materials are very promising for non-LSPR metamaterials owing to their smaller magnitude of real permittivity and small imaginary permittivity.
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The Mac
@TheMac
07 November, 07:01
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:01
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:01
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:02
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:02
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:07
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:09
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:12
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:14
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:17
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:17
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:18
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:18
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:18
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:23
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:23
In response The Mac to his Publication
Co-encapsulating solid lipid nanoparticles for multifunctional therapeutics: Preparation and characterization - ScienceDirect
One of the most favored features of using nanoparticulate delivery systems such as solid lipid nanoparticles (SLNs) is their capability to encapsulate…
https://www.sciencedirect.com/science/article/abs/pii/S0927775716306707Notice: Undefined index: tg1tga_access in /home/admin/www/anonup.com/themes/default/apps/timeline/post.phtml on line 396
The Mac
@TheMac
07 November, 07:24
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:26
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:26
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:27
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:27
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:28
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:28
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:30
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:31
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:34
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:35
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:35
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:36
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:36
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:38
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:39
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:41
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:45
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:46
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:48
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:49
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:49
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:50
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:51
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:51
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:52
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:52
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:52
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:53
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:53
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:54
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:54
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:54
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 07:55
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:03
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:04
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:05
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:06
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:06
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:07
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:07
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:10
In response The Mac to his Publication
Animation showing the radiation pattern of a phased array of 15 antenna elements spaced a quarter wavelength apart as the phase difference between adjacent antennas is swept between −120 and 120 degrees. The dark area is the beam or main lobe, while the light lines fanning out around it are sidelobes.
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The Mac
@TheMac
07 November, 08:12
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:13
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:14
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:14
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:15
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:15
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 08:16
In response The Mac to his Publication
You’ve been warned people.
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The Mac
@TheMac
07 November, 08:24
In response The Mac to his Publication
Researchers are developing new method of wireless deep brain stimulation. Two teams of scientists have developed new ways of stimulating neurons with nanoparticles, allowing them to activate brain cells remotely using light or magnetic fields.
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07 November, 12:00
In response The Mac to his Publication
5G coupled with the sun and magnetism of the earth ?
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The Mac
@TheMac
07 November, 02:53
In response Jason VanDerpoel to his Publication
The Sun's “loudest pitch” is about 0.0033 Hertz (Hz) — some 6,000 times below the lowest tone audible to a human ear.
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The Mac
@TheMac
07 November, 02:54
In response The Mac to his Publication
Om is the primordial sound of the universe
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The Mac
@TheMac
07 November, 02:55
In response The Mac to his Publication
In physics the term “ultrasound” applies to all acoustic energy with a frequency above human hearing (20,000 hertz or 20 kilohertz). Typical diagnostic sonographic scanners operate in the frequency range of 2 to 18 megahertz, hundreds of times greater than the limit of human hearing.
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The Mac
@TheMac
07 November, 02:58
In response The Mac to his Publication
Radio waves have the longest wavelengths in the electromagnetic spectrum. ... You can tune a radio to a specific wavelength—or frequency—and listen to your favorite music. The radio "receives" these electromagnetic radio waves and converts them to mechanical vibrations in the speaker to create the sound waves you can hear.
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The Mac
@TheMac
07 November, 02:59
In response The Mac to his Publication
A photon is a form of energy but the phonon is a mode of oscillation that occurs in lattice structures.
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07 November, 03:01
In response The Mac to his Publication
oscillation....vibration ?
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The Mac
@TheMac
07 November, 03:03
In response Jason VanDerpoel to his Publication
The significance of the above properties and how they can be modulated to achieve desirable characteristics is not only limited to the development of lipid nanoparticle dispersions suitable for Pickering stabilisation. Crystalline structure properties have been investigated for their influence in addressing high active loading and resistance to drug leakage demands. The tendency of SLNs to transform into highly ordered structures and lead to active expulsion during storage has been addressed by partial substitution with incompatible liquid lipids (NLCs), to create imperfections in the lipid crystal lattice, that will in turn also accommodate higher active incorporation (Hu et al., 2005; Jia et al., 2010).
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The Mac
@TheMac
07 November, 03:06
In response The Mac to his Publication
Twenty of the 32 crystal classes are piezoelectric, and crystals belonging to one of these classes (point groups) display piezoelectricity.
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The Mac
@TheMac
07 November, 03:08
In response The Mac to his Publication
what is a crystal lattice in chemistry?
: the arrangement of atoms, molecules, or ions of a crystal in the form of a space lattice.
: the arrangement of atoms, molecules, or ions of a crystal in the form of a space lattice.
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The Mac
@TheMac
07 November, 03:11
In response The Mac to his Publication
In Quantum Simulation
Atoms in an optical lattice provide an ideal quantum system where all parameters can be controlled. Because atoms can be imaged directly – something difficult to do with electrons in solids – they can be used to study effects that are difficult to observe in real crystals. Quantum gas microscopy techniques applied to trapped atom optical-lattice systems can even provide single-site imaging resolution of their evolution.
Atoms in an optical lattice provide an ideal quantum system where all parameters can be controlled. Because atoms can be imaged directly – something difficult to do with electrons in solids – they can be used to study effects that are difficult to observe in real crystals. Quantum gas microscopy techniques applied to trapped atom optical-lattice systems can even provide single-site imaging resolution of their evolution.
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The Mac
@TheMac
07 November, 03:13
In response The Mac to his Publication
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The Mac
@TheMac
07 November, 03:16
In response The Mac to his Publication
Stimulated Raman spectroscopy, also referred to as stimulated Raman scattering (SRS) is a form of spectroscopy employed in physics, chemistry, biology, and other fields. The basic mechanism resembles that of spontaneous Raman spectroscopy: a pump photon, of the angular frequency
ω
p
omega _{p}, which is absorbed by a molecule has some small probability of inducing some vibrational (or rotational) transition, as opposed to inducing a simple Rayleigh transition. This makes the molecule emit a photon at a shifted frequency.
ω
p
omega _{p}, which is absorbed by a molecule has some small probability of inducing some vibrational (or rotational) transition, as opposed to inducing a simple Rayleigh transition. This makes the molecule emit a photon at a shifted frequency.
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07 November, 03:31
In response The Mac to his Publication
Reading through all this also brings me to mention..... seeing Blue and Reds around the moon for a while now, light reflecting differently visible at night, new spectrum?
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The Mac
@TheMac
07 November, 03:48
In response Jason VanDerpoel to his Publication
In fluorescence spectroscopy, the Stokes shift is the difference between the spectral position of the maximum of the first absorption band and the maximum of the fluorescence emission and can be expressed in either wavelength or wavenumber units as shown in Figure 2
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The Mac
@TheMac
07 November, 03:49
In response The Mac to his Publication
'Red shift' is a key concept for astronomers. The term can be understood literally - the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum. Something similar happens to sound waves when a source of sound moves relative to an observer.
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The Mac
@TheMac
07 November, 03:50
In response The Mac to his Publication
1 : of, relating to, or utilizing a shift in frequency in accordance with the Doppler effect. 2 : of, relating to, using, or produced by Doppler ultrasound a Doppler examination Doppler images.
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The Mac
@TheMac
07 November, 03:52
In response The Mac to his Publication
The Doppler effect for electromagnetic waves such as light is of widespread use in astronomy to measure the speed at which stars and galaxies are approaching or receding from us, resulting in so called blueshift or redshift, respectively. This may be used to detect if an apparently single star is, in reality, a close binary, to measure the rotational speed of stars and galaxies, or to detect exoplanets. This effect typically happens on a very small scale; there would not be a noticeable difference in visible light to the unaided eye. The use of the Doppler effect in astronomy depends on knowledge of precise frequencies of discrete lines in the spectra of stars.
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The Mac
@TheMac
07 November, 03:54
In response The Mac to his Publication
binary; plural noun: binaries
1.
the binary system of notation.
"the device is counting in binary"
2.
something having two parts.
a binary star.
late Middle English (in the sense ‘duality, a pair’): from late Latin binarius, from bini ‘two together’.
1.
the binary system of notation.
"the device is counting in binary"
2.
something having two parts.
a binary star.
late Middle English (in the sense ‘duality, a pair’): from late Latin binarius, from bini ‘two together’.
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07 November, 03:58
In response The Mac to his Publication
Can waves heard or felt vibrationally creating an environment where such can be visible to the unaided eye ?
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The Mac
@TheMac
07 November, 04:47
In response Jason VanDerpoel to his Publication
Holographic detection of nanoparticles using acoustically actuated nanolenses | Nature Communications
The optical detection of nanoparticles, including viruses and bacteria, underpins many of the biological, physical and engineering sciences. However, due to their low inherent scattering, detection of these particles remains challenging, requiring complex instrumentation involving extensive sample p..
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The Mac
@TheMac
07 November, 04:49
In response The Mac to his Publication
(PDF) Holographic detection of nanoparticles using acoustically actuated nanolenses
PDF | The optical detection of nanoparticles, including viruses and bacteria, underpins many of the biological, physical and engineering sciences.... | Find, read and cite all the research you need on ResearchGate
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The Mac
@TheMac
07 November, 04:51
In response The Mac to his Publication
Acoustically-actuated bubble-powered rotational micro-propellers - ScienceDirect
Bubble-powered acoustic microsystems span a plethora of applications that range from lab-on-chip diagnostic platforms to targeted interventions as mic…
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The Mac
@TheMac
07 November, 04:52
In response The Mac to his Publication
acoustic lens[ə′küs·tik ′lenz]
(materials)
Selected materials shaped to refract sound waves in accordance with the principles of geometrical optics, as is done for light. Also known as lens.
(materials)
Selected materials shaped to refract sound waves in accordance with the principles of geometrical optics, as is done for light. Also known as lens.
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The Mac
@TheMac
07 November, 04:53
In response The Mac to his Publication
A reconfigurable active acoustic metalens: Applied Physics Letters: Vol 118, No 13
Acoustic metasurfaces have enabled unprecedented control over acoustic waves, offering opportunities in areas such as holographic rendering, sound absorption, and acoustic communication. Despite th...
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metalens (plural metalenses)
(physics) A lens made from a metamaterial
(physics) A lens made from a metamaterial
04:55 PM - Nov 07, 2021
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The Mac
@TheMac
07 November, 04:58
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The Mac
@TheMac
07 November, 04:58
In response The Mac to his Publication
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