Use of satellite data for tectonic interpretation,nw Himalaya     

Chirashree?Mohanty  Dibya?J.?BaralEmail author  Javed?N.?Malik 《Journal of the Indian Society of Remote Sensing》2004,32(3):241-247

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Imaging and power generation strategies for chandrayaan-1     

Ananth Krishna  N. S. Gopinath  N. S. Hegde  N. K. Malik 《Journal of Earth System Science》2005,114(6):739-748

The Chandrayaan-1 mission proposes to put a 550 kg lunarcraft into Geostationary Transfer Orbit (GTO) using the Polar Satellite Launch Vehicle (PSLV) which will subsequently be transferred into a 100 km circular lunar polar orbit for imaging purposes. In this paper, we describe certain aspects of mission strategies which will allow optimum power generation and imaging of the lunar surface. The lunar orbit considered is circular and polar and therefore nearly perpendicular to the ecliptic plane. Unlike an Earth orbiting remote sensing satellite, the orbit plane of lunar orbiter is inertially fixed as a consequence of the very small oblateness of the Moon. The Earth rotates around the Sun once a year, resulting in an apparent motion of Sun around this orbit in a year. Two extreme situations can be identified concerning the solar illumination of the lunar orbit, noon/midnight orbit, where the Sun vector is parallel to the spacecraft orbit plane and dawn/dusk orbit, where the Sun vector is perpendicular to the spacecraft orbit plane. This scenario directly affects the solar panel configuration. In case the solar panels are not canted, during the noon/midnight orbit, 100% power is generated, whereas during the dawn/dusk orbit, zero power is generated. Hence for optimum power generation, canting of the panels is essential. Detailed analysis was carried out to fix optimum canting and also determine a strategy to maintain optimum power generation throughout the year. The analysis led to the strategy of 180‡ yaw rotation at noon/midnight orbits and flipping the solar panel by 180‡ at dawn/dusk orbits. This also resulted in the negative pitch face of the lunarcraft to be an anti-sun panel, which is very useful for thermal design, and further to meet cooling requirements of the spectrometers. In principle the Moon’s surface can be imaged in 28 days, because the orbit chosen and the payload swath provide adequate overlap. However, in reality it is not possible to complete the imaging in 28 days due to various mission constraints like maximum duration of imaging allowed keeping in view the SSR sizing and payloads data input rate, time required for downlinking the payload data, data compression requirements and visibility of the lunarcraft for the Bangalore DSN. In each cycle, all the latitudes are swept. Due to the constraints mentioned, only 60‡ latitude arc coverage is possible in each orbit. As Bangalore DSN is the only station, half of the orbits in a day are not available. The longitudinal gaps because of non-visibility are covered in the next cycle by Bangalore DSN. Hence, in the firstprime imaging season, only 25% of the prime imaging zones are covered, and an additional threeprime imaging seasons are required for a full coverage of the Moon in two years. Strategy is also planned to cover X-ray payload coverage considering swath and orbit shift.  相似文献   

Failures of Waterworks Facilities and Their Consequences     

Malik  L. K.  Koronkevich  N. I.  Barabanova  E. A. 《Water Resources》2001,28(2):129-133

The causes of the failure of various dams, the existing approaches to determining the parameters of flood waves caused by dam failures, and the authors' method of calculation of these waves are considered. Characterization of the consequences of the dam-failure flood wave in the tailwater pool of the Volgograd hydroelectric station and some unfavorable aspects of possible evacuation of the Saratov reservoir are presented.  相似文献   

Sur les inocérames de Tercis (Landes,France) : le meilleur outil corrélatif entre Europe et Amérique du Nord autour de la limite Campanien–Maastrichtien     

Gilles Serge Odin  Ireneusz Walaszczyk 《Comptes Rendus Geoscience》2003,335(2):239-246

Four hundred inoceramids have been collected in the geological site at Tercis, where the Campanian–Maastrichtian boundary has been recently defined. At Tercis, a distinct drop of the adult size of inoceramids is observed between levels 111 and 117 and two turnovers of faunal composition were documented between levels 94 and 96 and between levels 111 and 117; the latter interval encompasses the stage boundary. The recognised inoceramid assemblages are very close to those known from North America, allowing better correlation than before between the two domains in the interval 77–70 Ma. The presence of these faunas perfectly located in the section leads to consider the Tercis section as the best known reference for this fossil group, the surprisingly good correlative potential of which has still to be considered in many areas.  相似文献   

Active fault traces along Bhuj Fault and Katrol Hill Fault, and trenching survey at Wandhay, Kachchh, Gujarat, India     

Michio Morino  Javed N. Malik  Prashant Mishra  Chandrashekhar Bhuiyan  Fumio Kaneko 《Journal of Earth System Science》2008,117(3):181-188

Several new active fault traces were identified along Katrol Hill Fault (KHF). A new fault (named as Bhuj Fault, BF) that extends into the Bhuj Plain was also identified. These fault traces were identified based on satellite photo interpretation and field survey. Trenches were excavated to identify the paleoseismic events, pattern of faulting and the nature of deformation. New active fault traces were recognized about 1km north of the topographic boundary between the Katrol Hill and the plain area. The fault exposure along the left bank of Khari River with 10m wide shear zone in the Mesozoic rocks and showing displacement of the overlying Quaternary deposits is indicative of continued tectonic activity along the ancient fault. The E-W trending active fault traces along the KHF in the western part changes to NE-SW or ENE-WSW near Wandhay village. Trenching survey across a low scarp near Wandhay village reveals three major fault strands F1, F2, and F3. These fault strands displaced the older terrace deposits comprising Sand, Silt and Gravel units along with overlying younger deposits from units 1 to 5 made of gravel, sand and silt. Stratigraphic relationship indicates at least three large magnitude earthquakes along KHF during Late Holocene or recent historic past.  相似文献   

Analysis of geological structure and anthropological factors affecting arsenic distribution in the Lahore aquifer,Pakistan   总被引：1，自引：0，他引：1  

Akhtar Malik Muhammad  Tang Zhonghua  Zakari Sissou  Bahaa Mohamadi  Muhsan Ehsan 《Hydrogeology Journal》2016,24(7):1891-1904

This study investigated the potential factors affecting arsenic concentration in the groundwater system of Lahore, Pakistan. The effects of several factors such as population density (PD), pumping rate (PR), impermeable land use (LU), surface elevation (SE), and water-table elevation (WL) on arsenic concentration were studied in 101 union councils of Lahore. Forty single and multi-factor models were established using geographic information system (GIS) techniques to develop an arsenic contamination map and to investigate the most effective combinations among factors. Additionally, statistical tests were used to evaluate arsenic concentration between classes of the same single factor. The arsenic concentration in the Lahore aquifer varied from 0.001 to 0.143 mg L^?1. The highest arsenic concentrations were detected in the Walled City and the town of Shahdara. Among the 40 raster models, groundwater arsenic concentration showed the best matching frequency with single-factor models for PD (50.70 %) and SE (47 %). Thus, PD and SE were used to develop an arsenic distribution raster map, and they were also used to study the effect of aquifer depth on arsenic concentration. PD was found to have hidden latent variables such as PR and LU. The shallow aquifer depth was negatively correlated with arsenic concentration (r?=??0.23) and positively with PR (r?=?0.15). Therefore, when there was high PR in wells with smaller aquifer depth, the arsenic concentration was high. The existing water treatment and alternative water resources are good options, which should be developed to deal with Lahore wells contaminated with arsenic at high concentrations.  相似文献   

Batch adsorption studies of the removal of methyl violet 2B by soya bean waste: isotherm,kinetics and artificial neural network modelling     

Muhammad Raziq Rahimi Kooh  Muhammad Khairud Dahri  Linda B. L. Lim  Lee Hoon Lim  Owais Ahmed Malik 《Environmental Earth Sciences》2016,75(9):783

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Contributions from Particles in Europe (PiE) 2010, Villefranche-sur-Mer,France: an introduction     

Ole?A.?MikkelsenEmail author  Malik?Chami  David?Doxaran 《Geo-Marine Letters》2012,32(2):85-87

This special issue of Geo-Marine Letters presents selected contributions from the international conference Particles in Europe (PiE) 2010 organized by Sequoia Scientific, Inc., and the Laboratoire d’Océanographie de Villefranche (LOV) on 15–17 November 2010 in Villefranche-sur-Mer, France, and guest-edited by Ole Mikkelsen, Malik Chami and David Doxaran. PiE was initiated in 2008, in order to promote and further our understanding of the importance of suspended particulate matter (SPM) for a very wide range of processes in the aquatic environment—from optics and acoustics, over sediment transport, to the global carbon balance. The papers in this special issue are in particular concerned with the interaction between SPM and water optical properties, as well as how to use optical proxy measurements to understand SPM processes. The next PiE conference is scheduled for 17–19 October 2012 in Barcelona, Spain.  相似文献   

Adsorption of Brilliant Green Dye on Biochar Prepared From Lignocellulosic Bioethanol Plant Waste          下载免费PDF全文

Muhammad Saif Ur Rehman  Ilgook Kim  Naim Rashid  Malik Adeel Umer  Muhammad Sajid  Jong‐In Han 《洁净——土壤、空气、水》2016,44(1):55-62

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Phytoremediation Potential of Hemp (Cannabis sativa L.): Identification and Characterization of Heavy Metals Responsive Genes          下载免费PDF全文

Rafiq Ahmad  Zara Tehsin  Samina Tanvir Malik  Saeed Ahmad Asad  Muhammad Shahzad  Muhammad Bilal  Mohammad Maroof Shah  Sabaz Ali Khan 《洁净——土壤、空气、水》2016,44(2):195-201

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