نتایج جستجو برای: calibration of angstrom
تعداد نتایج: 21168650 فیلتر نتایج به سال:
The adaptive secondary for the MMT is the first mirror of its kind. It was designed to allow the application of wavefront corrections (including tip-tilt) directly at the secondary mirror location. Among the advantages of such a choice for adaptive optics operation are higher throughput, lower emissivity, and simpler optical setup. Furthermore, this specific implementation provides capabilities...
This paper disctu;ses some advances in non-contact, interferometric optical profilers. Topics discussed include: (i) The advantages of using a white light source, rather than a laser source, (ii) The tradeoff between the use of Michelson, Mirau, and Linnik interferometers for different fields of view and different lateral resolutions, and.(iii) Techniques for removing errors in the reference su...
Squashing salivary glands of Chironomus thummi larvae, Amblystoma tigrinum erythrocytes, or Spirostromum frequently results in stretched chromatin having highly oriented DNA as determined by polarized fluorescence microscopy of acridine orange-stained preparations. The examination of such material from C. thummi in the electron microscope indicates that the individual chromatin fibers have an a...
Electron microscopy is arguably the most powerful tool for spatial imaging of structures. As such, 2D and 3D microscopies provide static structures with subnanometer and increasingly with angstrom-scale spatial resolution. Here we report the development of 4D ultrafast electron microscopy, whose capability imparts another dimension to imaging in general and to dynamics in particular. We demonst...
Midinfrared strong-field laser ionization offers the promise of measuring holograms of atoms and molecules, which contain both spatial and temporal information of the ion and the photoelectron with subfemtosecond temporal and angstrom spatial resolution. We report on the scaling of photoelectron holographic interference patterns with the laser pulse duration, wavelength, and intensity. High-res...
Two multivariate calibration methods are compared for the simultaneous chromatographic determination and separation of Sulfamethoxazole (SMX) and Phthalazine (PHZ) by High Performance Liquid Chromatography (HPLC). Multivariate calibration techniques such as Classical Least Squares (CLS) and Inverse Least Squares (ILS) were introduced into HPLC to determine the quantification by using UV d...
A new method was developed for the spectral resolution by further determination of three- and four-component mixtures of drugs in urine samples through the complementary application of multivariate curve resolution-alternating least squares with correlation constraint. In the current study, a simple method was proposed to construct a calibration set for the mixture of drugs in the p...
X-ray diffraction studies on dispersions and oriented multilayers of dipalmitoyllecithin and different fluorescent probe molecules are reported. Analysis of the diffraction data provides the electron density profile for the different bilayers to 6- to 8-Angstrom resolution. The location of the probe molecules in the bilayer structure and the perturbation of the lecithin bilayer produced by the ...
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