The Mac
@TheMac
19 August, 08:44
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Truth Seeker1111
@TruthSeeker1111
19 August, 09:27
In response The Mac to his Publication
what is this?
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The Mac
@TheMac
20 August, 05:07
In response Truth Seeker1111 to her Publication
Luminous intensity, the quantity of visible light that is emitted in unit time per unit solid angle. The unit for the quantity of light flowing from a source in any one second (the luminous power, or luminous flux) is called the lumen. The lumen is evaluated with reference to visual sensation.
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The Mac
@TheMac
20 August, 05:08
In response The Mac to his Publication
Several measures of light are commonly known as intensity:
Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr)
Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd)
Irradiance, a radiometric quantity, measured in watts per square meter (W/m2)
Intensity (physics), the name for irradiance used in other branches of physics (W/m2)
Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr−1·m−2)
Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr)
Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd)
Irradiance, a radiometric quantity, measured in watts per square meter (W/m2)
Intensity (physics), the name for irradiance used in other branches of physics (W/m2)
Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr−1·m−2)
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The Mac
@TheMac
20 August, 05:09
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:09
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:10
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:10
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:10
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:11
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:11
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:12
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:12
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:13
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:13
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:14
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:14
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:15
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:15
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:16
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:16
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:16
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:17
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:18
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:18
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:19
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:19
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:20
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:23
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:23
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:23
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:26
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:26
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:26
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:26
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:27
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:27
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:28
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:28
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:29
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:32
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:33
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:33
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:39
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:41
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:42
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:44
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:44
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:44
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:44
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 05:45
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:12
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:12
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:13
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:13
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:15
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:16
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:16
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:19
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:20
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:21
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:21
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:22
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:22
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:22
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:23
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:23
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:24
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:26
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:27
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:27
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:28
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:29
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:30
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:35
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:36
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:37
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:38
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:39
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 06:40
In response The Mac to his Publication
In optics, an ultrashort pulse of light is an electromagnetic pulse whose time duration is of the order of a picosecond (10−12 second) or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators. They are commonly referred to as ultrafast events. Amplification of ultrashort pulses almost always requires the technique of chirped pulse amplification, in order to avoid damage to the gain medium of the amplifier.
They are characterized by a high peak intensity (or more correctly, irradiance) that usually leads to nonlinear interactions in various materials, including air. These processes are studied in the field of nonlinear optics.
They are characterized by a high peak intensity (or more correctly, irradiance) that usually leads to nonlinear interactions in various materials, including air. These processes are studied in the field of nonlinear optics.
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The Mac
@TheMac
20 August, 06:41
In response The Mac to his Publication
In the specialized literature, "ultrashort" refers to the femtosecond (fs) and picosecond (ps) range, although such pulses no longer hold the record for the shortest pulses artificially generated. Indeed, x-ray pulses with durations on the attosecond time scale have been reported.
The 1999 Nobel Prize in Chemistry was awarded to Ahmed H. Zewail, for the use of ultrashort pulses to observe chemical reactions at the timescales on which they occur, opening up the field of femtochemistry.
The 1999 Nobel Prize in Chemistry was awarded to Ahmed H. Zewail, for the use of ultrashort pulses to observe chemical reactions at the timescales on which they occur, opening up the field of femtochemistry.
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The Mac
@TheMac
20 August, 06:43
In response The Mac to his Publication
There is no standard definition of ultrashort pulse. Usually the attribute 'ultrashort' applies to pulses with a duration of a few tens of femtoseconds, but in a larger sense any pulse which lasts less than a few picoseconds can be considered ultrashort. The distinction between "Ultrashort" and "Ultrafast" is necessary as the speed at which the pulse propagates is a function of the index of refraction of the medium through which it travels, whereas "Ultrashort" refers to the temporal width of the pulse wavepacket.
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The Mac
@TheMac
20 August, 06:44
In response The Mac to his Publication
A common example is a chirped Gaussian pulse, a wave whose field amplitude follows a Gaussian envelope and whose instantaneous phase has a frequency sweep.
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The Mac
@TheMac
20 August, 06:47
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:16
In response The Mac to his Publication
In atomic, molecular, and optical physics, above-threshold ionization (ATI), is a multi-photon effect where an atom is ionized with more than the energetically required number of photons.[1] It was first observed in 1979.[2]
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The Mac
@TheMac
20 August, 07:18
In response The Mac to his Publication
High intensity ultrashort pulse lasers can create ATI features with 20 or more peaks.[5] The photoelectron spectrum of electron energies is continuous since actual light sources contain a spread of energies.
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The Mac
@TheMac
20 August, 07:19
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:20
In response The Mac to his Publication
Photoionization is the physical process in which an ion is formed from the interaction of a photon with an atom or molecule.
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The Mac
@TheMac
20 August, 07:22
In response The Mac to his Publication
realization
/riːəlʌɪˈzeɪʃn/
noun: realization; noun: realisation
1.
an act of becoming fully aware of something as a fact.
"a growing realization of the need to create common economic structures"
awareness
understanding
comprehension
consciousness
apprehension
cognizance
appreciation
recognition
perception
discernment
/riːəlʌɪˈzeɪʃn/
noun: realization; noun: realisation
1.
an act of becoming fully aware of something as a fact.
"a growing realization of the need to create common economic structures"
awareness
understanding
comprehension
consciousness
apprehension
cognizance
appreciation
recognition
perception
discernment
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The Mac
@TheMac
20 August, 07:24
In response The Mac to his Publication
the achievement of something desired or anticipated.
actualization
fulfilment
achievement
accomplishment
attainment
bringing to fruition
bringing into being
consummation
effecting
effectuation
reification
actualization
fulfilment
achievement
accomplishment
attainment
bringing to fruition
bringing into being
consummation
effecting
effectuation
reification
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The Mac
@TheMac
20 August, 07:25
In response The Mac to his Publication
the making or being made real of something imagined, planned, etc. the result of such a process: The new church was the realization of a ten-year dream. the act of realizing or the state of being realized. an instance or result of realizing.
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The Mac
@TheMac
20 August, 07:27
In response The Mac to his Publication
Not every interaction between a photon and an atom, or molecule, will result in photoionization. The probability of photoionization is related to the photoionization cross section of the species, which depends on the energy of the photon (proportional to its wavenumber) and the species being considered. In the case of molecules, the photoionization cross-section can be estimated by examination of Franck-Condon factors between a ground-state molecule and the target ion. For photon energies below the ionization threshold, the photoionization cross-section is near zero. But with the development of pulsed lasers it has become possible to create extremely intense, coherent light where multi-photon ionization may occur. At even higher intensities (around 1015 – 1016 W/cm2 of infrared or visible light), non-perturbative phenomena such as barrier suppression ionization[3] and rescattering ionization[4] are observed.
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The Mac
@TheMac
20 August, 07:30
In response The Mac to his Publication
Resonance-enhanced multiphoton ionization (REMPI) is a technique applied to the spectroscopy of atoms and small molecules in which a tunable laser can be used to access an excited intermediate state.
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The Mac
@TheMac
20 August, 07:32
In response The Mac to his Publication
A simple example of this concept comes by considering the hydrogen atom.
The ground state of the hydrogen atom corresponds to having the atom's single electron in the lowest possible orbital (that is, the spherically symmetric "1s" wave function, which, so far, has demonstrated to have the lowest possible quantum numbers). By giving the atom additional energy (for example, by the absorption of a photon of an appropriate energy), the electron is able to move into an excited state (one with one or more quantum numbers greater than the minimum possible). If the photon has too much energy, the electron will cease to be bound to the atom, and the atom will become ionized.
The ground state of the hydrogen atom corresponds to having the atom's single electron in the lowest possible orbital (that is, the spherically symmetric "1s" wave function, which, so far, has demonstrated to have the lowest possible quantum numbers). By giving the atom additional energy (for example, by the absorption of a photon of an appropriate energy), the electron is able to move into an excited state (one with one or more quantum numbers greater than the minimum possible). If the photon has too much energy, the electron will cease to be bound to the atom, and the atom will become ionized.
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The Mac
@TheMac
20 August, 07:33
In response The Mac to his Publication
After excitation the atom may return to the ground state or a lower excited state, by emitting a photon with a characteristic energy. Emission of photons from atoms in various excited states leads to an electromagnetic spectrum showing a series of characteristic emission lines (including, in the case of the hydrogen atom, the Lyman, Balmer, Paschen and Brackett series.)
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The Mac
@TheMac
20 August, 07:35
In response The Mac to his Publication
The excitation of a system (an atom or molecule) from one excited state to a higher energy excited state with the absorption of a photon is called excited state absorption (ESA). Excited state absorption is possible only when an electron has been already excited from the ground state to a lower excited state. The excited state absorption is usually an undesired effect, but it can be useful in upconversion pumping.[8] Excited state absorption measurements are done using pump-probe techniques such as flash photolysis. However, it is not easy to measure them compared to ground-state absorption and in some cases complete bleaching of the ground state is required to measure excited state absorption.[9]
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The Mac
@TheMac
20 August, 07:37
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:38
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:39
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:39
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:40
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:43
In response The Mac to his Publication
An emerging class of inorganic optical reporters are near-infrared (NIR) excitable lanthanide-based upconversion nanoparticles (UCNPs) with multicolor emission and long luminescence lifetimes in the range of several hundred microseconds. For the design of chemical sensors and optical probes that reveal analyte-specific changes in their spectroscopic properties, these nanomaterials must be combined with sensitive indicator dyes that change their absorption and/or fluorescence properties selectively upon interaction with their target analyte, utilizing either resonance energy transfer (RET) processes or reabsorption-related inner filter effects.
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The Mac
@TheMac
20 August, 07:43
In response The Mac to his Publication
The rational development of UCNP-based nanoprobes for chemical sensing and imaging in a biological environment requires reliable methods for the surface functionalization of UCNPs, the analysis and quantification of surface groups, a high colloidal stability of UCNPs in aqueous media as well as the chemically stable attachment of the indicator molecules, and suitable instrumentation for the spectroscopic characterization of the energy-transfer systems and the derived nanosensors. These topics are highlighted in the following feature article, and examples of functionalized core–shell nanoprobes for the sensing of different biologically relevant analytes in aqueous environments will be presented. Special emphasis is placed on the intracellular sensing of pH
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The Mac
@TheMac
20 August, 07:48
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:48
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:48
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:49
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:49
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:49
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:50
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:50
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:52
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 07:54
In response The Mac to his Publication
Finished.
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The Mac
@TheMac
20 August, 08:02
In response The Mac to his Publication
finishen
(intransitive, racing) to finish
(intransitive, racing) to finish
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The Mac
@TheMac
20 August, 08:04
In response The Mac to his Publication
F I N I S H E N D
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The Mac
@TheMac
20 August, 08:05
In response The Mac to his Publication
The Proto-Germanic meaning of *ǥuđán and its etymology is uncertain. It is generally agreed that it derives from a Proto-Indo-European neuter passive perfect participle *ǵʰu-tó-m. This form within (late) Proto-Indo-European itself was possibly ambiguous, and thought to derive from a root *ǵʰeu̯- "to pour, libate" (the idea survives in the Dutch word, 'Giet', meaning, to pour) (Sanskrit huta, see hotṛ), or from a root *ǵʰau̯- (*ǵʰeu̯h2-) "to call, to invoke" (Sanskrit hūta). Sanskrit hutá = "having been sacrificed", from the verb root hu = "sacrifice", but a slight shift in translation gives the meaning "one to whom sacrifices are made."
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The Mac
@TheMac
20 August, 08:06
In response The Mac to his Publication
The English word god comes from the Old English god, which itself is derived from the Proto-Germanic *ǥuđán. Its cognates in other Germanic languages include guþ, gudis (both Gothic), guð (Old Norse), god (Old Saxon, Old Frisian, and Old Dutch), and got (Old High German).
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The Mac
@TheMac
20 August, 08:09
In response The Mac to his Publication
The earliest uses of the word God in Germanic writing is often cited to be in the Gothic Bible or Wulfila Bible, which is the Christian Bible as translated by Ulfilas into the Gothic language spoken by the Eastern Germanic, or Gothic, tribes. The oldest parts of the Gothic Bible, contained in the Codex Argenteus, are estimated to be from the fourth century. During the fourth century, the Goths were converted to Christianity, largely through the efforts of Bishop Ulfilas, who translated the Bible into the Gothic language in Nicopolis ad Istrum in today's northern Bulgaria. The words guda and guþ were used for God in the Gothic Bible.
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The Mac
@TheMac
20 August, 08:13
In response The Mac to his Publication
Bible
/ˈbʌɪb(ə)l/
noun
singular proper noun: Bible; noun: the Bible; noun: bible
1.
the Christian scriptures, consisting of the Old and New Testaments.
"verses from the Bible"
/ˈbʌɪb(ə)l/
noun
singular proper noun: Bible; noun: the Bible; noun: bible
1.
the Christian scriptures, consisting of the Old and New Testaments.
"verses from the Bible"
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The Mac
@TheMac
20 August, 08:14
In response The Mac to his Publication
The difference between New and Old. When used as nouns, new means things that are new, whereas old means people who are old. When used as adjectives, new means recently made, or created, whereas old means of an object, concept, relationship, etc., having existed for a relatively long period of time.
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The Mac
@TheMac
20 August, 08:16
In response The Mac to his Publication
A time-variant system is a system whose output response depends on moment of observation as well as moment of input signal application.[1] In other words, a time delay or time advance of input not only shifts the output signal in time but also changes other parameters and behavior. Time variant systems respond differently to the same input at different times. The opposite is true for time invariant systems (TIV).
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The Mac
@TheMac
20 August, 08:18
In response The Mac to his Publication
Sine wave example
We can observe the phase shifting effect thru a sine wave. ... Time delay shifts all frequencies by the same amount of time, whereas phase shift delays some frequencies longer than others. In fact, an all-pass filters center frequency is defined at the frequency at which the phase shift is 90 degrees
We can observe the phase shifting effect thru a sine wave. ... Time delay shifts all frequencies by the same amount of time, whereas phase shift delays some frequencies longer than others. In fact, an all-pass filters center frequency is defined at the frequency at which the phase shift is 90 degrees
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The Mac
@TheMac
20 August, 08:21
In response The Mac to his Publication
God standeth in the congregation of the mighty; he judgeth among the gods.
How long will ye judge unjustly, and accept the persons of the wicked? Selah.
Defend the poor and fatherless: do justice to the afflicted and needy.
Deliver the poor and needy: rid them out of the hand of the wicked.
They know not, neither will they understand; they walk on in darkness: all the foundations of the earth are out of course.
I have said, Ye are gods; and all of you are children of the most High.
But ye shall die like men, and fall like one of the princes.
Arise, O God, judge the earth: for thou shalt inherit all nations.
How long will ye judge unjustly, and accept the persons of the wicked? Selah.
Defend the poor and fatherless: do justice to the afflicted and needy.
Deliver the poor and needy: rid them out of the hand of the wicked.
They know not, neither will they understand; they walk on in darkness: all the foundations of the earth are out of course.
I have said, Ye are gods; and all of you are children of the most High.
But ye shall die like men, and fall like one of the princes.
Arise, O God, judge the earth: for thou shalt inherit all nations.
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The Mac
@TheMac
20 August, 08:26
In response The Mac to his Publication
There could be delays to the deepstates plan?
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The Mac
@TheMac
20 August, 08:29
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 08:30
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 08:31
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 08:32
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 08:34
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:17
In response The Mac to his Publication
Though DABYCL works well in Molecular Beacons (structured probes with paired reporter and quencher that utilize static quenching), its absorption maximum of 474 nm places it below the maxima of the reporters shown in Figure 2, therefore it is a poor choice for Dual-Labeled Probes (linear probes with separated reporter and quencher that utilize FRET quenching).
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The Mac
@TheMac
20 August, 09:21
In response The Mac to his Publication
A Molecular beacon is a single-stranded bi-labeled fluorescent probe held in a hairpin-loop conformation (around 20 to 25 nt) by complementary stem sequences (around 4 to 6 nt) at both ends of the probe. The 5’ and 3’ ends of the probe contain a reporter and a quencher molecule, respectively. The loop is a single-stranded DNA sequence complementary to the target sequence. The proximity of the reporter and quencher causes the quenching of the natural fluorescence emission of the reporter. The structure and mechanism of a molecular beacon is shown below.
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The Mac
@TheMac
20 August, 09:23
In response The Mac to his Publication
Molecular beacons hybridize to their specific target sequence causing the hairpin-loop structure to open and separate the 5’ end reporter from the 3’ end quencher. As the quencher is no longer in proximity to the reporter, fluorescence emission takes place. The measured fluorescence signal is directly proportional to the amount of target DNA.
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The Mac
@TheMac
20 August, 09:26
In response The Mac to his Publication
Three molecular beacon FRET pairs were designed, synthesized and tested in solution. These molecular beacons were designed to hybridize to adjacent regions on an mRNA target so that the two fluorophores will lie within the FRET range (∼6 nm) when probe/target binding occurs for both beacons.
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The Mac
@TheMac
20 August, 09:31
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:32
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:32
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:33
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:34
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:36
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:38
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:39
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:42
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 09:42
In response The Mac to his Publication
No threat?
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The Mac
@TheMac
20 August, 10:04
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 10:06
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 10:15
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The Mac
@TheMac
20 August, 10:17
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The Mac
@TheMac
20 August, 10:22
In response The Mac to his Publication
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The Mac
@TheMac
20 August, 10:33
In response The Mac to his Publication
A blocking oscillator (sometimes called a pulse oscillator) is a simple configuration of discrete electronic components which can produce a free-running signal, requiring only a resistor, a transformer, and one amplifying element such as a transistor or vacuum tube. The name is derived from the fact that the amplifying element is cut-off or "blocked" for most of the duty cycle, producing periodic pulses on the principle of a relaxation oscillator. The non-sinusoidal output is not suitable for use as a radio-frequency local oscillator, but it can serve as a timing generator, to power lights, LEDs, Elwire, or small neon indicators. If the output is used as an audio signal, the simple tones are also sufficient for applications such as alarms or a Morse code practice device. Some cameras use a blocking oscillator to strobe the flash prior to a shot to reduce the red-eye effect
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The Mac
@TheMac
20 August, 10:36
In response The Mac to his Publication
Due to the circuit's simplicity, it forms the basis for many of the learning projects in commercial electronic kits. The secondary winding of the transformer can be fed to a speaker, a lamp, or the windings of a relay. Instead of a resistor, a potentiometer placed in parallel with the timing capacitor permits the frequency to be adjusted freely, but at low resistances the transistor can be overdriven, and possibly damaged. The output signal will jump in amplitude and be greatly distorted.
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The Mac
@TheMac
20 August, 10:39
In response The Mac to his Publication
Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.[1] The disturbance may degrade the performance of the circuit or even stop it from functioning.
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The Mac
@TheMac
20 August, 10:40
In response The Mac to his Publication
In the case of a data path, these effects can range from an increase in error rate to a total loss of the data.[2] Both man-made and natural sources generate changing electrical currents and voltages that can cause EMI: ignition systems, cellular network of mobile phones, lightning, solar flares, and auroras (northern/southern lights). EMI frequently affects AM radios. It can also affect mobile phones, FM radios, and televisions, as well as observations for radio astronomy and atmospheric science.
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The Mac
@TheMac
20 August, 10:46
In response The Mac to his Publication
EMI can be used intentionally for radio jamming, as in electronic warfare.
https://youtu.be/oFRbZJXjW...
https://youtu.be/oFRbZJXjW...
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The Mac
@TheMac
20 August, 10:50
In response The Mac to his Publication
A low white blood cell count usually is caused by: Viral infections that temporarily disrupt the work of bone marrow.
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The Mac
@TheMac
20 August, 10:52
In response The Mac to his Publication
Since then, they have found that piezoelectricity occurs when bone collagen fibers slide against each other. ... This leads to the accumulation of charges and the generation of a tiny current, which opens up calcium ion channels in bone cells called osteocytes.
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The Mac
@TheMac
20 August, 10:55
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The Mac
@TheMac
20 August, 10:56
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