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Search Results: 1 - 10 of 5154 matches for " Differential Polarimetry "
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差示旋光法对VC含量的测定及分析
Differential Polarimetry Measurement and Analysis of the Content of VC
 [PDF]

孙宝良, 孙文涛
Journal of Advances in Physical Chemistry (JAPC) , 2012, DOI: 10.12677/JAPC.2012.12003
Abstract:
维生素C的含量测定主要有碘量法、分光光度法、旋光法、高效液相色谱法、薄层扫描法等多种测量方法,其中碘量法测量过程较为繁琐,且不易排除辅料对维生素C复方制剂的干扰[1];而分光光度法、高效液相色谱法、薄层扫描法等对测量仪器要求较高,加大了检测成本[1]。本文应用物理学方法,借助于线性回归理论,利用维生素C在不同pH的溶液中其旋光度有显著差异,并且其差示旋光度和浓度在一定范围内呈线性关系的特点,通过差示旋光法对VC注射液的含量进行测定,同时对实验的有关影响因素进行研究分析。结果表明VC注射液在2.50 mg/ml~12.5 mg/ml范围内浓度与差示旋光度的线性关系良好,得到的相关方程为y = 0.1835x + 0.0113,相关系数r = 0.996。对比其他测量方法,该方法简单可靠,结果合理,从而达到快速、简便、准确的测定VC含量的目的,尤其适用于中小医院相关科室对药物的快速检测。
Determination of vitamin C content of the main iodometry, spectrophotometry, polarimetry, HPLC, TLC scanning method and other methods of measurement, iodometric method for the measurement process is more cumber-some and difficult to exclude excipients vitamin C compound interference; higher spectrophotometry, HPLC, TLC scan-ning method of measuring instruments, and increased testing costs. In this paper, methods of physics, by means of linear regression theory, the use of vitamin C in different pH solution in the optical rotation were significantly different, and the differential characteristics of the optical rotation and a linear relationship between concentration within a certain range, by difference show the polarimetry VC injection of content were measured at the same time to study and analyze the influencing factors of the experiment. The results show that the VC injection in 2.50 mg/ml. To 12.5 mg/ml concentra-tion and differential optical rotation of the linear relationship, the related equation y = 0.1835 x + 0.0113, the correlation coefficient r = 0.996. Compared with other measurement methods, the method is simple and reliable, the result is rea-sonable, so as to achieve fast, simple and accurate determination of the purpose of the VC content, especially for small and medium-sized hospital departments for the rapid detection of drugs.
To Measure the Changing Relief of Arctic Rivers: A Synthetic Aperture RADAR Experiment in Alaska  [PDF]
Reginald R. Muskett
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.69016
Abstract: This river crossing the lowland tundra-permafrost of the continuous permafrost zone of the Alaska North Slope can have extensive floodplain relief not simply created by channel migration during spring floods alone. Many of the rivers have channel-beds inherited from glacial landscapes and Holocene to present-day paraglacial and periglacial processes and mountain gradient sources [1] [2] [3] [4]. Interest is turning to understand effects from permafrost and ice wedge networks (ground ice) thaw, degradation and erosion and how such effects impact carbon and water equivalent mass balance. The 2015 flooding of the Sagavanirktok River crossing the Alaska North Slope brings this and additional impacts to-and-by human infrastructure into focus. Geodetic methods to measure centimeter to millimeter-scale changes using aircraft- and satellite-deployed Synthetic Aperture (SA) RAdio Detection And Ranging (RADAR) cannot ignore volume scattering. Backscatter and coherence at L-frequency and others possess both surface and volumetric scattering. On lowland tundra underlain by permafrost volume scattering dominants the RADAR backscatter coherence (the results of this work and [16]). Measurement of the L-frequency penetration depth for evaluation of mass change (carbon and water equivalent loss and transport) through permafrost and ground ice thaw-degradation with erosion is necessary. The Jet Propulsion Laboratory-National Aeronautical and Space Administration airborne Uninhabited Aerial Vehicle SAR (UAVSAR) L-frequency full quad-polarimetry cross-pole HHVV (polarization rotation, Horizontal to Vertical) confirms the dominance of volume scattering on lowland tundra (RADAR-soft targets) whereas surface scattering (HHHH or VVVV, no rotation) dominates on river channel deposits, rock outcrops and metal objects (RADAR-hard targets). Quantifying polarization rotation and the L-frequency penetration depth on lowland tundra are challenges for a new field validation and verification experiment.
Spectra of Plasmon Polaritons at Metal―Insulator Interfaces of a Nanosized Gold Film: Expansion into Components and Their Systematization  [PDF]
Lidiya Maksimenko, Igor Matyash, Oleg Mischuk, Svetlana Rudenko, Boris Serdega, Maksim Stetsenko
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.58072
Abstract:
The spectral characteristics of surface plasmon resonance (SPR) in nanosized gold films were studied with method of internal reflection in the Kretschmann geometry. (For more information,please refer to the PDF.)
Laser Polarimetry of Birefringence of Architectonics of Biotissues
A.G. Ushenko,O.I.Olar,Yu.A. Ushenko
Ukrainian Journal of Physical Optics , 2003,
Abstract: The features of polarization tomography of optically anisotropic architectonic nets of biotissues (BT) of different morphological structures have been investigated. The peculiarities of phase mapping of skin derma, muscular and bone BT have been experimentally studied. The interrelation between the BT structure and physiological state of BT has been determined. The criteria of early diagnostics of the appearance of degenerative-dystrophic and pathological changes in the structure of BT optically anisotropic architectonics have been revealed.
Mapping boreal forest biomass with imagery from polarimetric and semi-polarimetric SAR sensors / Mapeamento da biomassa orestal boreal com imagens dos sensores SAR polarimétricos e semi-polarimétricos
Yrjo Rauste,Anne Lonnqvist,Heikki Ahola
Ambiência , 2008,
Abstract: Data from ALOS/Palsar and TerraSAR-X were used to estimate forest biomass in Boreal forest zone in Finland. In the study site in Heinavesi (forest biomass between 0 and 255 tons/ha), the HH-polarised componentof dual-polarised ALOS/Palsar produced biomass estimation accuracies (RMSE) between 35 and 42 tons/ha. In the Kuortane site (biomass0…188 tons/ha) the RMSE varied between 25 and 28 tons/ha. Since onlytwo winter-time scenes from TerraSAR-X were available, TerraSAR-X results were very preliminary. The phase of the HH-VV cross-coherenceproduced the highest biomass-correlations among the TerraSAR-X derived features. This produced a biomass estimation accuracy (RMSE) of 49 tons/ha in the Heinavesi study site.
Bilateral Distance Based Filtering for Polarimetric SAR Data
Alberto Alonso-González,Carlos López-Martínez,Philippe Salembier,Xinping Deng
Remote Sensing , 2013, DOI: 10.3390/rs5115620
Abstract: This paper introduces a non-linear Polarimetric SAR data filtering approach able to preserve the edges and small details of the data. It is based on exploiting the data locality in both, the spatial and the polarimetric domains, in order to avoid mixing heterogeneous samples of the data. A weighted average is performed over a given window favoring pixel values that are close on both domains. The filtering technique is based on a modified bilateral filtering, which is defined in terms of spatial and polarimetric distances. These distances encapsulate all the knowledge in both domains for an adaptation to the data structure. Finally, the proposed technique is employed to process a real RADARSAT-2 dataset.
Optical signature of wood sample - Mueller matrix imaging polarimetry
K. Srinivasa Reddy,V. Mohan kumar,S. Chandra lingam,P. Raghavendra Rao
Journal of Engineering and Applied Sciences , 2010,
Abstract: Mueller Matrix Imaging Polarimetry is a powerful imaging technique used to provide high precision measurements for the Mueller matrices at every pixel of an image captured with a detector. The system used acquires 16 Mueller Matrix images and these images are further processed to investigate the polarization properties of the sample under consideration. In this communication the optical system used to acquire the Mueller Matrix Images functioning in reflection frame is described and the resulting polarization character of the wood sample is presented.
Avalia??o da influência da interface solo-ar sobre os dados colhidos em po?os com o radar polarimétrico
Lopes, Eliezer P.;Lopes, Elizeu P.;
Revista Brasileira de Geofísica , 2000, DOI: 10.1590/S0102-261X2000000200002
Abstract: the main purpose of this paper is to determine the minimum depth value beyond which it is possible to state that borehole-radar data are not significantly affected by the lateral wave and the wave reflected at the ground-air interface. this depth value is of paramount importance for cross-borehole electromagnetic probing. three methods of solving the problem in question are presented: a numerical method, a graphical method and an analytical method. five practical examples illustrate the use of the methods. thus the advantages of the proposed methods over the classical way of solving the same problem are stressed. thanks to the new methods, it is possible to avoid the unfruitful tasks of collecting and processing data that will be discarded later, when it is discovered that they are significantly degraded by the ground-air interface. the costs of the unproductive tasks may be high in geotomographic electromagnetic surveys owing to the large amount of data they typically involve. practical examples show that the proposed methods make easier the planning of such surveys and the interpretation of geotomographs. the cause of artifacts in a geotomograph cannot be ascribed to the ground-air interface when the methods indicate that its influence over the borehole-radar data is negligible. the plane of incidence contains both boreholes. an electric dipole, placed in a borehole, can emit transverse magnetic (tm) waves. an axial slot on a conducting cylinder can emit transverse electric (te) waves from a borehole. the proposed methods apply to both these cases.
Investigation of the capability of the Compact Polarimetry mode to Reconstruct Full Polarimetry mode using RADARSAT2 data
Souissi Boularbah,Mounira Ouarzeddine,Aichouche Belhadj-Aissa
Advanced Electromagnetics , 2012, DOI: 10.7716/aem.v1i1.12
Abstract: Recently, there has been growing interest in dual-pol systems that transmit one polarization and receive two polarizations. Souyris et al. proposed a DP mode called compact polarimetry (CP) which is able to reduce the complexity, cost, mass, and data rate of a SAR system while attempting to maintain many capabilities of a fully polarimetric system. This paper provides a comparison of the information content of full quad-pol data and the pseudo quad-pol data derived from compact polarimetric SAR modes. A pseudo-covariance matrix can be reconstructed following Souyris’s approach and is shown to be similar to the full polarimetric (FP) covariance matrix. Both the polarimetric signatures based on the kennaugh matrix and the Freeman and Durden decomposition in the context of this compact polarimetry mode are explored. The Freeman and Durden decomposition is used in our study because of its direct relationship to the reflection symmetry. We illustrate our results by using the polarimetric SAR images of Algiers city in Algeria acquired by the RadarSAT2 in C-band.
High accuracy polarimetry and its application
Y.Shopa
Ukrainian Journal of Physical Optics , 2001,
Abstract: The principles of high accuracy polarimetry are described. The methods of simultaneous measurements of birefringence and optical activity in anisotropic directions of crystals are considered. The measurement technique and experimental results of first polarization methods on the base of the azimuthal oscillations and high accuracy null polarimetry, HAUP, tilter system are analyzed. The attention is paid to a method that is similar to HAUP, which was designed with participation of the author and is used for studying of a number of crystals.
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