han_2000_apl
... Figure 2(b) and (c) are obtained at a room humidity concentration of 50%. Since no water vapor line lies at 0.84 THz, little difference is observed when a THz waveform is taken under a different humidity condition. However, when the repetition rate of the second harmonic pulse train was tuned to 1. ...
... Figure 2(b) and (c) are obtained at a room humidity concentration of 50%. Since no water vapor line lies at 0.84 THz, little difference is observed when a THz waveform is taken under a different humidity condition. However, when the repetition rate of the second harmonic pulse train was tuned to 1. ...
EBSD SEM TEM
... 1.2.2 Factors which influence the resolution of the imaging system One of the most powerful tools to improve the resolution is the probe’s wave length (λ): The resolution normal to the direction of the incident beam, often called spatial resolution, is influenced by the diameter of the incident be ...
... 1.2.2 Factors which influence the resolution of the imaging system One of the most powerful tools to improve the resolution is the probe’s wave length (λ): The resolution normal to the direction of the incident beam, often called spatial resolution, is influenced by the diameter of the incident be ...
Aalborg Universitet
... the double-transverse part of the tensor. We present a general method for calculating this tensor from complete sets of biorthogonal modes for the vector wave equation. The vectorial nature of the formalism allows calculation of spontaneous emission depending on position, transition frequency, and p ...
... the double-transverse part of the tensor. We present a general method for calculating this tensor from complete sets of biorthogonal modes for the vector wave equation. The vectorial nature of the formalism allows calculation of spontaneous emission depending on position, transition frequency, and p ...
Real-Time Multicolor DNA Detection with Chemoresponsive
... uptake to an analyte-specific color change, either of the analyte itself or of the grating. For example, chloroform can be readout preferentially by ca. 3500-fold relative to methanol when these are taken up by a nonchemically selective grating composed of a mildly vapochromic charge-transfer salt.9 ...
... uptake to an analyte-specific color change, either of the analyte itself or of the grating. For example, chloroform can be readout preferentially by ca. 3500-fold relative to methanol when these are taken up by a nonchemically selective grating composed of a mildly vapochromic charge-transfer salt.9 ...
[pdf]
... Here rs and rd are the source and the detector positions, respectively, a is the radius of the inhomogeneity, and v is the angular source modulation frequency; e.g., v 5 2pf, where f is what we generally call the modulation frequency. N1 and t1 are the fluorophore concentration and lifetime, respect ...
... Here rs and rd are the source and the detector positions, respectively, a is the radius of the inhomogeneity, and v is the angular source modulation frequency; e.g., v 5 2pf, where f is what we generally call the modulation frequency. N1 and t1 are the fluorophore concentration and lifetime, respect ...
Frenkel excitons
... 1. i) Calculate the exciton Rydberg and Bohr radius for GaAs, which has r =12.8, me* = 0.067 m0 and mh*=0.2m0. ii) GaAs has a cubic crystal structure with a unit cell size of 0.56 nm. Estimate the number of unit cells contained within the orbit of the n=1 exciton. Hence justify the validity of assu ...
... 1. i) Calculate the exciton Rydberg and Bohr radius for GaAs, which has r =12.8, me* = 0.067 m0 and mh*=0.2m0. ii) GaAs has a cubic crystal structure with a unit cell size of 0.56 nm. Estimate the number of unit cells contained within the orbit of the n=1 exciton. Hence justify the validity of assu ...
幻灯片 1
... 1. i) Calculate the exciton Rydberg and Bohr radius for GaAs, which has r =12.8, me* = 0.067 m0 and mh*=0.2m0. ii) GaAs has a cubic crystal structure with a unit cell size of 0.56 nm. Estimate the number of unit cells contained within the orbit of the n=1 exciton. Hence justify the validity of assu ...
... 1. i) Calculate the exciton Rydberg and Bohr radius for GaAs, which has r =12.8, me* = 0.067 m0 and mh*=0.2m0. ii) GaAs has a cubic crystal structure with a unit cell size of 0.56 nm. Estimate the number of unit cells contained within the orbit of the n=1 exciton. Hence justify the validity of assu ...
GRAPHITE
... Stains fingers when touched; Feels greasy; Conducts electricity; Its flakes are thin, slightly flexible and inelastic brittle. ...
... Stains fingers when touched; Feels greasy; Conducts electricity; Its flakes are thin, slightly flexible and inelastic brittle. ...
LASER LIGHT SCATTERING FOR INVESTIGATION OF PARTICLE
... there by securing the best price possible. However, there is no universal grading system. Each producing country has their own national standard which fulfills the minimum export quality requirement suggested by the market[2,3,5]. Most probably the flavor and quality of coffee depends on the coffee ...
... there by securing the best price possible. However, there is no universal grading system. Each producing country has their own national standard which fulfills the minimum export quality requirement suggested by the market[2,3,5]. Most probably the flavor and quality of coffee depends on the coffee ...
Rayleigh scattering. Scattering and absorption by aerosols and
... λ and m are both arbitrary but for spheres only (applies to scattering by aerosol and cloud particles) Geometrical optics: 2π πr/λ λ is very large and m is real (applies to scattering by large cloud droplets and ice crystals). ...
... λ and m are both arbitrary but for spheres only (applies to scattering by aerosol and cloud particles) Geometrical optics: 2π πr/λ λ is very large and m is real (applies to scattering by large cloud droplets and ice crystals). ...
Deuterium fractionation of methylamine through atomic grain
... Institute of Low Temperature Science, Hokkaido University, Japan Interstellar methylamine (CH3NH2) was first found in 1974 toward Sgr B2 and Ori A [1]. This finding is of interest in view of astrobiology because methylamine could be a precursor of amino acid in space [2]. Laboratory studies revealed ...
... Institute of Low Temperature Science, Hokkaido University, Japan Interstellar methylamine (CH3NH2) was first found in 1974 toward Sgr B2 and Ori A [1]. This finding is of interest in view of astrobiology because methylamine could be a precursor of amino acid in space [2]. Laboratory studies revealed ...
Visible to near-infrared optical properties of pure synthetic olivine
... across VNIR wavelengths, but the samples studied were not pure stoichiometric olivine of precise compositions because they were natural samples, typically containing minor amounts of nonstoichiometric cations (e.g., Ca2+, Mn2+, Cr2+, Fe3+). Furthermore, natural samples cannot sample the full range o ...
... across VNIR wavelengths, but the samples studied were not pure stoichiometric olivine of precise compositions because they were natural samples, typically containing minor amounts of nonstoichiometric cations (e.g., Ca2+, Mn2+, Cr2+, Fe3+). Furthermore, natural samples cannot sample the full range o ...
Detennining the Phase Diagra1n and Aggregate Size of a Chro1nonic Liquid Crystal J
... BPP 4B were investigated. To determine the phase diagram, the temperatures marking the beginning and end of the liquid crystal-liquid coexistence region were measured for a range of concentrations. Since the liquid crystal phase is birefringent, these temperatures were measured optically by relating ...
... BPP 4B were investigated. To determine the phase diagram, the temperatures marking the beginning and end of the liquid crystal-liquid coexistence region were measured for a range of concentrations. Since the liquid crystal phase is birefringent, these temperatures were measured optically by relating ...
Semiperiodicity versus periodicity for ultra broadband optical
... are relatively strong, the resulting enhancement of the optical absorption is narrowband conforming to the narrow spectral range of the excited mode.8,9 On the other side, random grating structures are capable of exciting a broad range of weak modes, however, as these multiple modes are rather faint ...
... are relatively strong, the resulting enhancement of the optical absorption is narrowband conforming to the narrow spectral range of the excited mode.8,9 On the other side, random grating structures are capable of exciting a broad range of weak modes, however, as these multiple modes are rather faint ...
Full-Text PDF
... and mesopores have been synthesized by delaminating the layered zeolite precursors MCM-22 and ferrierite [14]. However, none of these techniques yields a regular distribution of mesopores, let alone an ideal channel system of mesopores structurally connected with the regular micropores of the zeolit ...
... and mesopores have been synthesized by delaminating the layered zeolite precursors MCM-22 and ferrierite [14]. However, none of these techniques yields a regular distribution of mesopores, let alone an ideal channel system of mesopores structurally connected with the regular micropores of the zeolit ...
PDF
... (composition, stress, structure, colour, ...). The most well-established method for inorganic microanalysis is probably EPMA (electron probe microanalysis), sometimes denoted as SEM-EDX (scanning electron microscopy equipped with an energy-dispersive X-ray detector); however, this method only provid ...
... (composition, stress, structure, colour, ...). The most well-established method for inorganic microanalysis is probably EPMA (electron probe microanalysis), sometimes denoted as SEM-EDX (scanning electron microscopy equipped with an energy-dispersive X-ray detector); however, this method only provid ...
Persistence of uranium emission in laser
... Investigations into the feasibility of OES for U detection have used both SNMs and surrogate materials,6–8 including uranium oxide powders and pelletized versions of said powders.9 Experiments have primarily used spatially integrated optical emission collection methods, e.g., with a fiber optic cabl ...
... Investigations into the feasibility of OES for U detection have used both SNMs and surrogate materials,6–8 including uranium oxide powders and pelletized versions of said powders.9 Experiments have primarily used spatially integrated optical emission collection methods, e.g., with a fiber optic cabl ...
Quantitative spectroscopic photoacoustic imaging
... from measurements of the absorbed energy density spectra HðλÞ straightforwardly, for example, using a linear matrix inversion. Unfortunately the unknown fluence Φ depends in a nontrivial way on the chromophore concentrations because T λ is both nonlinear and nonlocal (H at one point can be affected ...
... from measurements of the absorbed energy density spectra HðλÞ straightforwardly, for example, using a linear matrix inversion. Unfortunately the unknown fluence Φ depends in a nontrivial way on the chromophore concentrations because T λ is both nonlinear and nonlocal (H at one point can be affected ...
Doppler-Free Saturated Absorption Spectroscopy of Rubidium Using a Tunable Diode Laser
... Tunable diode lasers are often used in atomic physics because they’re relatively inexpensive, reliable sources of narrow-band light [1]. By using a diode laser with a high reflectivity coating on its back facet and a reduced reflectivity on the output facet, along with a diffraction grating with a h ...
... Tunable diode lasers are often used in atomic physics because they’re relatively inexpensive, reliable sources of narrow-band light [1]. By using a diode laser with a high reflectivity coating on its back facet and a reduced reflectivity on the output facet, along with a diffraction grating with a h ...
Total Internal Reflection Spectroscopy for Studying Soft Matter
... and to quantifying the composition of an interfacial film. The central challenge in interfacial spectroscopy is distinguishing the few molecules at the interface from the much greater number of molecules in the bulk. There are two main approaches to achieving surface selectivity. The first is to use ...
... and to quantifying the composition of an interfacial film. The central challenge in interfacial spectroscopy is distinguishing the few molecules at the interface from the much greater number of molecules in the bulk. There are two main approaches to achieving surface selectivity. The first is to use ...
Uranium Oxide as a Highly Reflective Coating
... Pros: high density and many electrons (92) for absorption, high theoretical reflectivity: low absorption and high index of refraction Con: chemically reactive (oxidizes in air to most abundant natural oxide UO2 at STP) We study different compounds of uranium, such as uranium dioxide (UO2) and uraniu ...
... Pros: high density and many electrons (92) for absorption, high theoretical reflectivity: low absorption and high index of refraction Con: chemically reactive (oxidizes in air to most abundant natural oxide UO2 at STP) We study different compounds of uranium, such as uranium dioxide (UO2) and uraniu ...
Interaction of electromagnetic radiation with matter
... We will also need to know the re¯ection and transmission coef®cients r and t. The re¯ection coef®cient is de®ned as the electric ®eld amplitude of the re¯ected radiation, expressed as a fraction of the electric ®eld amplitude of the incident radiation, and similarly for the transmission coef®cient. ...
... We will also need to know the re¯ection and transmission coef®cients r and t. The re¯ection coef®cient is de®ned as the electric ®eld amplitude of the re¯ected radiation, expressed as a fraction of the electric ®eld amplitude of the incident radiation, and similarly for the transmission coef®cient. ...
Collective effects in the radiation pressure force
... previous section, the cloud also has a diffracting effect on the incident light due to its finite size. From a macroscopic point of view, and as far as diffraction effects are concerned, the atomic cloud can be described as a dielectric medium with an effective complex refractive index, even when th ...
... previous section, the cloud also has a diffracting effect on the incident light due to its finite size. From a macroscopic point of view, and as far as diffraction effects are concerned, the atomic cloud can be described as a dielectric medium with an effective complex refractive index, even when th ...
Laboratory Practices from Physical Chemistry
... Using analytical scales, we determine the weight, m1, of empty Dumas flask with stopper. We add ca 1–2 ml of sample to Dumas flask and we place it in the thermostatic bath with temperature Tk. Only the end of the flask neck (1–2 cm) has to project from the bath. During sample evaporation, all air fr ...
... Using analytical scales, we determine the weight, m1, of empty Dumas flask with stopper. We add ca 1–2 ml of sample to Dumas flask and we place it in the thermostatic bath with temperature Tk. Only the end of the flask neck (1–2 cm) has to project from the bath. During sample evaporation, all air fr ...
Soliton Self-Frequency Shift Cancellation in
... energy slowly (i.e., nonexponentially) with increasing propagation distance z, transferring it to the resonant dispersive wave. To conserve the overall energy of the photons, the carrier soliton frequency gets shifted in the spectral direction opposite to that of the radiation. This is the so-called ...
... energy slowly (i.e., nonexponentially) with increasing propagation distance z, transferring it to the resonant dispersive wave. To conserve the overall energy of the photons, the carrier soliton frequency gets shifted in the spectral direction opposite to that of the radiation. This is the so-called ...
Atomic absorption spectroscopy
Atomic absorption spectroscopy (AAS) is a spectroanalytical procedure for the quantitative determination of chemical elements using the absorption of optical radiation (light) by free atoms in the gaseous state.In analytical chemistry the technique is used for determining the concentration of a particular element (the analyte) in a sample to be analyzed. AAS can be used to determine over 70 different elements in solution or directly in solid samples used in pharmacology, biophysics and toxicology research.Atomic absorption spectroscopy was first used as an analytical technique, and the underlying principles were established in the second half of the 19th century by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, both professors at the University of Heidelberg, Germany.The modern form of AAS was largely developed during the 1950s by a team of Australian chemists. They were led by Sir Alan Walsh at the Commonwealth Scientific and Industrial Research Organisation (CSIRO), Division of Chemical Physics, in Melbourne, Australia.Atomic absorption spectrometry has many uses in different areas of chemistry such as: Clinical analysis: Analyzing metals in biological fluids and tissues such as whole blood, plasma, urine, saliva, brain tissue, liver, muscle tissue, semen Pharmaceuticals: In some pharmaceutical manufacturing processes, minute quantities of a catalyst that remain in the final drug product Water analysis: Analyzing water for its metal content.↑ ↑ ↑