Discriminating Fog and Rain at the Kilometre Scale Using the Extinction from Collocated Infrared and Microwave Scintillometers     

Perelet  Alexei O.  Gultepe  Ismail  Hoch  Sebastian W.  Pardyjak  Eric R. 《Boundary-Layer Meteorology》2021,181(2-3):295-315

Boundary-Layer Meteorology - We investigate the path-averaged visibility and discrimination of fog and rain events using a two-wavelength (near-infrared and microwave) scintillometer system. These...  相似文献   

Dike distribution in the Oman-United Arab Emirates ophiolite     

Nicolas  A.  Ildefonse  B.  Boudier  F.  Lenoir  X.  Ben Ismail  W. 《Marine Geophysical Researches》2000,21(3-4):269-287

Mafic dikes and dunite veins are observed in the mantle section of the Oman – United Arab Emirates (O-UAE) ophiolites, as well as diabase dikes and hydrothermal veins in the crust section. They have been systematically measured during the mapping of this ophiolite and are represented by their trajectories in the folded map 3 in the back of this volume, and by local stereoplots included in this study. Mafic dikes in the mantle section correspond to basaltic melt being injected at decreasing temperatures from above or at peridotite solidus, down to below 450°C. Hydrothermal veins associated with dioritic dikes issued from hydrous melting of host gabbros are observed down to the base of the crust, bearing evidence for sea water penetration into basal gabbros at or above 900°C, that is very close to the ridge axis. Dike orientations record the stress field at the time of their injection. In most places, all types of dikes are dominantly parallel to the general trend of the nearest sheeted dike complex; thus the stress field has not visibly changed from melt injection in the asthenosphere below the ridge of origin to injection in a lithosphere up to a few Myr old, at distances beyond 100 km from the axis. Local preferred orientations, when they are considered in the frame of the paleo-ridge system of O-UAE, result in a coherent model throughout the belt: the sheeted dike complex dips moderately away from the presumed ridge axis and the mantle dikes, toward this axis. These opposite directions are explained by the presumed effect of subsidence toward the axis for the sheeted dikes and by the central feeding from an asthenospheric uprise for the mantle dikes.  相似文献   

The use of logistic model tree (LMT) for pixel- and object-based classifications using high-resolution WorldView-2 imagery     

Ismail Colkesen 《国际地球制图》2017,32(1):71-86

Logistic model tree (LMT), a new method integrating standard decision tree (DT) induction and linear logistic regression algorithm in a single tree, have been recently proposed as an alternative to DT-based learning algorithms. In this study, the LMT was applied in the context of pixel- and object-based classifications using high-resolution WorldView-2 imagery, and its performance was compared with C4.5, random forest and Adaboost. Results of the study showed that the LMT generally produced more accurate classification results than the other methods for both pixel- and object-based classifications. The improvement in classification accuracy reached to 3% in pixel-based and 5% in object-based classifications. It was also estimated that the LMT algorithm produced the most accurate results considering the allocation and overall disagreement errors. Based on the Wilcoxon’s Signed-Ranks tests, the performance differences between the LMT and the other methods were statistically significant for both pixel- and object-based image classifications.  相似文献   

Prediction of Mechanical Properties of Coal from Non-destructive Properties: A Comparative Application of MARS,ANN, and GA     

Lawal  Abiodun Ismail  Oniyide  Gafar O.  Kwon  Sangki  Onifade  Moshood  Köken  Ekin  Ogunsola  Nafiu O. 《Natural Resources Research》2021,30(6):4547-4563

Natural Resources Research - Rock properties are useful for safe operation and design of both surface and underground mines including civil engineering projects. However, the cost and time required...  相似文献   

Use of Cement Kiln Dust on the Engineering Modification of Soil Materials,Nile Delta,Egypt     

A. I. M. Ismail  Z. L. Belal 《Geotechnical and Geological Engineering》2016,34(2):463-469

Cement kiln dust (CKD) is the by-product generated from the manufacture of Portland cement. Disposal quantities of CKD in construction project are required to protect the environment. In the recent construction experience in the area of study at the last years showed that, ground and underground engineering on the soft soil are susceptible to various types of cracking in buildings and roads. The improvement of engineering properties of two disturbed soils by using CKD in different percentages (5, 10 and 20 %) was discussed in this paper. The results indicated that CKD additives increased the pH values and decreased the plasticity index in both types of soils under investigation. The maximum dry density (MDD) decreased and optimum moisture content (OMC) increased with increasing the percentage of CKD in soil A. In soil B the MDD and OMC decreased.  相似文献   

Experimental Study of Bearing Capacity of Granular Soils,Reinforced with Innovative Grid-Anchor System   总被引：1，自引：0，他引：1  

Mansour Mosallanezhad  Nader Hataf  Arsalan Ghahramani 《Geotechnical and Geological Engineering》2008,26(3):299-312

The pull-out resistance of reinforcing elements is one of the most significant factors in increasing the bearing capacity of geosynthetic reinforced soils. In this research a new reinforcing element that includes elements (anchors) attached to ordinary geogrid for increasing the pull-out resistance of reinforcements is introduced. Reinforcement therefore consists of geogrid and anchors with cubic elements that attached to the geogrid, named (by the authors) Grid-Anchor. A total of 45 load tests were performed to investigate the bearing capacity of square footing on sand reinforced with this system. The effect of depth of the first reinforcement layer, the vertical spacing, the number and width of reinforcement layers, the distance that anchors are effective, effect of relative density, low strain stiffness and stiffness after local shear were investigated. Laboratory tests showed that when a single layer of reinforcement is used there is an optimum reinforcement embedment depth for which the bearing capacity is the greatest. There also appeared to be an optimum vertical spacing of reinforcing layers for multi-layer reinforced sand. The bearing capacity was also found to increase with increasing number of reinforcement layer, if the reinforcement were placed within a range of effective depth. The effect of soil density also is investigated. Finally the results were compared with the bearing capacity of footings on non-reinforced sand and sand reinforced with ordinary geogrid and the advantages of the Grid-Anchor were highlighted. Test results indicated that the use of Grid-Anchor to reinforce the sand increased the ultimate bearing capacity of shallow square footing by a factor of 3.0 and 1.8 times compared to that for un-reinforced soil and soil reinforced with ordinary geogrid, respectively.  相似文献   

Determination of Free Nickel Ion Concentrations Using the Ion Exchange Technique: Application to Aqueous Mining and Municipal Effluents     

Yamini Gopalapillai  Ismail I. Fasfous  John D. Murimboh  Tahir Yapici  Parthasarathi Chakraborty  Chuni L. Chakrabarti 《Aquatic Geochemistry》2008,14(2):99-116

Free metal ion concentration is generally considered a useful indicator of a metal’s bioavailability and ecotoxicity to aquatic biota. This article reports the speciation of nickel in mining and municipal effluents from Sudbury (Ontario, Canada), and also in model solutions containing a fully characterized laurentian fulvic acid (LFA) at environmentally relevant concentrations. A column ion exchange technique (IET) using a cation exchange resin (Dowex 50W-X8) was applied to determine free nickel ion concentrations. In model solutions, reasonable correlation was found between the predictions of an equilibrium-based computer speciation code, Windermere Humic Aqueous Model (WHAM) VI, and the results obtained by IET at low nickel-to-fulvic acid ratios. However at higher mole ratios, the WHAM VI predicted higher free nickel ion concentrations than IET. Only three out of six effluent samples showed reasonable agreement between the IET and the WHAM VI results, indicating the need for further development of IET for application to effluent waters.  相似文献   

Geology and Re-Os Geochronology of Mineralization of the Miduk Porphyry Copper Deposit, Iran     

Nader Taghipour    Alijan Aftabi  Ryan Mathur 《Resource Geology》2008,58(2):143-160

The Miduk porphyry copper deposit is located in Kerman province, 85 km northwest of the Sar Cheshmeh porphyry copper deposit, Iran. The deposit is hosted by Eocene volcanic rocks of andesitic–basaltic composition. The porphyry‐type mineralization is associated with two Miocene calc‐alkaline intrusive phases (P1 and P2, respectively). Five hypogene alteration zones are distinguished at the Miduk deposit, including magnetite‐rich potassic, potassic, potassic–phyllic, phyllic and propylitic. Mineralization occurs as stockwork, dissemination and nine generations (magnetite, quartz–magnetite, barren quartz, quartz‐magnetite‐chalcopyrite‐anhydrite, chalcopyrite–anhydrite, quartz‐chalcopyrite‐anhydrite‐pyrite, quartz‐molybdenite‐anhydrite ± chalcopyrite ± magnetite, pyrite, and quartz‐pyrite‐anhydrite ± sericite) of veinlets and veins. Early stages of mineralization consist of magnetite rich veins in the deepest part of the deposit and the main stage of mineralization contains chalcopyrite, magnetite and anhydrite in the potassic zone. The high intensity of mineralization is associated with P2 porphyry (Miduk porphyry). Based on petrography, mineralogy, alteration halos and geochemistry, the Miduk porphyry copper deposit is similar to those of continental arc setting porphyry copper deposits. The Re‐Os molybdenite dates provide the timing of sulfide mineralization at 12.23 ± 0.07 Ma, coincident with U/Pb zircon ages of the P2 porphyry. This evidence indicates a direct genetic relationship between the Miduk porphyry stock and molybdenite mineralization. The Re‐Os age of the Miduk deposit marks the main stage of magmatism and porphyry copper formation in the Central Iranian volcano‐plutonic belt.  相似文献   

Degradation of β-blockers in water by sulfate radical-based oxidation: kinetics,mechanism and ecotoxicity assessment     

K. S. Tay  N. S. B. Ismail 《International Journal of Environmental Science and Technology》2016,13(10):2495-2504

This study investigated the kinetics and degradation pathway of acebutolol, metoprolol and sotalol in a sulfate radical-based advanced oxidation process. The selected pharmaceuticals were β-blockers which have been used to treat cardiovascular diseases. Due to its frequent use, the presence of these pharmaceuticals in the environment has been regularly reported. In this study, sulfate radicals were generated using peroxymonosulfate with cobalt (II) as activator. At pH 7 and 25 °C, the second-order rate constant for the reaction between SO₄ ^·? with metoprolol, acebutolol and sotalol was (1.0 ± 0.1) × 10¹⁰, (2.0 ± 0.1) × 10¹⁰ and (3.0 ± 0.2) × 10¹⁰ M^?1 s^?1, respectively. Sixteen transformation by-products were identified from the selected β-blockers. These transformation by-products were mainly formed through the hydroxylation, aromatic ring-opening reaction and aliphatic chain oxidation. The decomposition of β-blockers by sulfate radicals was found to start from the formation of hydroxylated β-blockers followed by an aromatic ring-opening reaction. In general, this study showed that β-blockers reacted favorably with sulfate radicals, and various transformation by-products could be produced. The result from the ecotoxicity assessment showed that almost all of the transformation by-products were less toxic than its parent compound. Therefore, a sulfate radical-based advanced oxidation process could be an effective method for the treatment of β-blockers in water.  相似文献   

Subsurface profile interpretation of landslides,examples from Bashilo River watershed,Ethiopia     

Elamin H. Ismail  J. David Rogers  M. Farooq Ahmed  M. Zubair Abu Bakar 《Environmental Earth Sciences》2016,75(16):1153

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