نتایج جستجو برای: remote sensing by laser beam
تعداد نتایج: 7282589 فیلتر نتایج به سال:
In this article, M2 factor of a thin disk laser with unstable resonator in two regimes is calculated numerically. In the first case, thermal effects are ignored and the parameters of beam width, divergence angle, radius of wave front curvature and finally, M2 factor of laser beam are calculated by using generalized beam parameters. These calculations show that the beam quality of the laser is d...
Human groups have considered the Behshahr plain of Mazandaran in the past Due to its particular geographical shape, location between the Caspian Sea and mountains, and the existence of some rivers in the region. However, our knowledge of this area is limited to several published surveys and archaeological investigation of its ancient sites. No detailed research has conducted on the formation of...
Infrared Laser Remote Sensing has a number of very useful applications in air warfare. These are primarily in reconnaissance and Bomb Damage Assessment (BDA), and use derivatives of the established commercial Laser Remote Sensing technology base. Technical principles, implementation and operational constraints are discussed, as well as the limitations of the method.
the modulation response, relative intensity noise and frequency noise characteristics of qd lasers are investigated theoretically, in presence of an additional optical pumping. it is revealed that the modulation response of qd laser enhances under additional optical beam. by small signal analysis of the carriers' and photons' rates, it is proposed that by injecting excess carriers to ...
nitric oxide (no) is a small molecule synthesized by most of mammalian cells with diverse biological activities including vasodilatation, host defense and wound healing. impaired wound healing is a common occurrence among diabetics and patients receiving glucocorticoid therapy. on the other hand the application of laser in biomedical area have been increased. thus, the current studies were desi...
A single beam laser Doppler vibrometer (LDV) has been used in acoustic-to-seismic landmine detection in a stop-andstare scanning mode [Sabatier, J. M. and Xiang, N. IEEE Trans. Geoscience and Remote Sensing 39, 2001, pp.11461154.; Xiang, N. and Sabatier, J. M., J. Acoust. Soc. Am. 113, Mar. 2003]. One of the major requirements is the operational scanning speed in the acoustic detection methods....
a State Key Laboratory of Remote Sensing Science, Center for Remote Sensing and GIS of Geography College, Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing Normal University, Beijing, China b Center for Remote Sensing, Department of Geography and Environment, Boston University, Boston, MA, USA c Department of Geography and National Centre for Earth Observation...
given the critical role played by urban green spaces and the emergence of remote sensing as avaluable natural resource management tool, this study sought to identify trends in green spaces within thecontext of south africa’s transition period (1990 - 2000). using the city of port elizabeth as a case study, threesets of landsat - 5 thematic mapper images (1990, 1995 and 2000) were geo-processed,...
Soil salinity phenomena are one of the main problems of arid and semi-arid lands. Saline soils constitute a huge part of Iran, and also threaten its neighboring lands. Therefore, in order to optimum exploitation of such soils, qualitative monitoring is necessary. Recently, remote sensing techniques have been increasingly applied in monitoring soil characteristics. The present study was carried ...
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