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Impact of land cover change on land surface temperature: A case study of Spiti Valley

Journal of Mountain Science 2018年第8期15卷 1658-1670页

作者： KUMAR Pankaj husain arif SINGH Ram Babu KUMAR Manish Department of Geography Delhi School of Economics University of Delhi Department of Geography Kalindi College University of Delhi

Land surface temperature(LST) is the skin temperature of the earth surface. LST depends on the amount of sunlight received by any geographical area. Apart from sun light, LST is also affected by the land cover, which leads to change in land surface temperature. Impact of land cover change(LCC) on LST has been assessed using Landsat TM5, Landsat 8 TIRS/OLI and Digital Elevation Model(ASTER) for Spiti Valley, Himachal Pradesh, India. In the present study, Spiti valley was divided into three altitudinal zones to check the pattern of changing land cover along different altitudes and LST was calculated for all the four land cover categories extracted from remote sensing data for the years of 1990 and 2015. Matrix table was used as a technique to evaluate the land cover change between two different years. Matrix table shows that as a whole, about 2,151,647 ha(30%) area of Spiti valley experienced change in land cover in the last 25 years. The result also shows vegetation and water bodies increased by 107,560.2 ha(605.87%) and 45 ha(0.98%), respectively. Snow cover and barren land decreased by 19,016.5 ha(23.92%) and 88,589(14.14%), during the study period. A significant increase has been noticed in vegetation amongst all land cover types. Minimum, maximum and mean LST for three altitudinal zones have been calculated. The mean LST recorded was 11℃ in 1990 but it rose by 2℃ and reached to 13℃ in 2015. Changes in LST were obtained for each land cover categories. The mean temperature of different land cover types was calculated by averaging value of all pixels of a given land cover types. The mean LST of vegetation, barren land, snow cover and water body increased by 6℃, 9℃, 1℃, and 7℃, respectively. Further, relationships between LST, Normalized Difference Snow Index(NDSI), and Normalised Difference Vegetation Index(NDVI) were established using Linear Regression.

关键词： Land surface temperature Land cover change Normalised difference snow index Normalised Difference Vegetation Index DEM Remote Sensing GIS Linear Regression

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Palaeoenvironmental reconstruction for the Permian(lower Gondwana)succession of the Godavari Valley Coalfield in southern India based on a combined palynofacies,carbon isotope,and biomarker study

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Journal of Palaeogeography 2022年第1期11卷 123-144页

作者： Neha Aggarwal Runcie Paul Mathews arif husain Ansari Biswajeet Thakur Shailesh Agrawal Birbal Sahni Institute of Palaeosciences 53 University RoadLucknow 226007India

The study presents integrated palynofacies,organic carbon isotope,and biomarker data to reconstruct palaeoenviromental setting for the Permian sediments(borehole MGK-6)of the Kachinapalli block of the Godavari Valley Coalfield,southern *** palynofacies data reveal three distinct palynofacies(A-C)as *** A is dominated by abundant arborescent vegetation(glossopterids and conifers)along with structured organic matter,suggesting freshwater forest swamps in proximal *** B is dominated by abundant degraded organic matter and amorphous organic matter,suggesting lakeshore/flooded palaeomires in slightly dismal *** has a high water level in the hinterland,which enables bacterial degradation of organic matter and establishes low-oxygenation conditions within the water *** conditions would have provided grounds for the accumulation of either degraded or amorphous organic *** C is dominated by the abundance of charcoal/opaque phytoclasts,indicating prolonged transportation or postdepositional alteration,suggesting a highly-oxidizing condition in distal *** bulk organic δ^(13)C range(-25.1‰ to-20.9‰)in the borehole MGK-6 is in close agreement with the global Permian *** study also shows a weak but statistically significant correlation with the major forms of palynofacies A and *** interlinked behaviour of bulk organic δ^(13)C and palynofacies suggests that the changes in palaeobiogeography/palaeodepositional settings were most likely driven by the change in mean annual *** biomarker study shows the presence of n-alkane from C_(15) to C_(31) with unimodal and bimodal distribution patterns,revealing the source materials as vascular plants and microbially-altered organic *** combined palynofacies,organic carbon isotope,and biomarker data provide vital clue to salient findings for the development of environmental conditions of Godavari Valley Coalfield during lower Gond

关键词： Artinskian Guadalupian Depositional environment Carbon isotope Biomarker Godavari valley coalfield

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洱海流域不同施肥模式对稻田氮磷径流流失的影响

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农业环境科学学报 2021年第6期40卷 1305-1313页

作者：姜海斌沈仕洲谷艳茹于双邹洪涛 arif husain 张磊张克强农业农村部环境保护科研监测所天津300191 沈阳农业大学土地与环境学院沈阳110866 国家农业环境大理观测实验站云南大理671004 大理市农业环境保护监测站云南大理671000

为探究洱海流域水稻种植的合理施肥模式,减少稻田氮磷径流流失,通过田间小区试验,研究不同施肥模式对稻田氮磷径流流失和水稻产量的影响。结果表明:与常规施肥处理(CF)相比,化肥减量20%处理(T1)总氮径流流失量无显著差异,有机肥替代处理... 详细信息

为探究洱海流域水稻种植的合理施肥模式,减少稻田氮磷径流流失,通过田间小区试验,研究不同施肥模式对稻田氮磷径流流失和水稻产量的影响。结果表明:与常规施肥处理(CF)相比,化肥减量20%处理(T1)总氮径流流失量无显著差异,有机肥替代处理(T2~T5)总氮径流流失量降低31.6%~40.4%,缓控释肥处理(T6)总氮径流流失量降低15.7%;与CF处理相比,T1、T2和T6处理总磷径流流失量无显著差异,T3和T5处理总磷径流流失量分别降低23.3%和17.4%,T4处理总磷流失量增加57.0%。与CF处理相比,T6处理和T1处理籽粒产量无显著差异,T2~T5处理籽粒产量降低11.8%~42.9%;与T1处理相比,T5和T3处理籽粒产量无显著差异。与CF处理相比,T1、T6和T4处理秸秆产量无显著差异,T2、T3和T5处理秸秆产量分别降低15.5%、16.0%和36.0%。综合考虑不同施肥处理的稻田径流流失量和水稻产量等因素,化肥减量(T1)、有机无机配施(T3和T5)和缓控释肥(T6)处理是可供选择的环境友好型施肥模式。

关键词：洱海流域施肥模式稻田径流氮磷流失产量

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Comparative assessment of maximum power point tracking procedures for photovoltaic systems

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Green Energy & Environment 2017年第1期2卷 5-17页

作者： Mohammed Aslam husain Abu Tariq Salman Hameed M.Saad Bin arif Abhinandan Jain Department of Electrical Engineering Aligarh Muslim University Department of Electronics Engineering Aligarh Muslim University

The fast growing demands and increasing awareness for the environment, PV systems are being rapidly installed for numerous ***, one of the important challenges in utilizing a PV source is the maximum power harnessing using various maximum power point tracking techniques available. With the large number of MPPT techniques, each having some merits and demerits, confusion is always there for their proper selection. Discussion on various proposed procedures for maximum power point tracking of photovoltaic array has been done. Based on different parameters analysis of MPPT techniques is carried out. This assessment will serve as a suitable reference for selection, understanding different ways and means of MPPT.

关键词： Maximum power point tracking(MPPT) Photovoltaic(PV) Solar Perturb and observe Optimization

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Potential of plant polyphenol oxidases in the decolorization and removal of textile and non-textile dyes

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Journal of Environmental Sciences 2007年第4期19卷 396-402页

作者： AMJAD ALI Khan QAYYUM husain Department of Biochemistry Faculty of Life Science Aligarh Muslim UniversityAligarh-202 002India.

In this study an effort has been made to use plant polyphenol oxidases; potato （Solanum tuberosum） and brinjal （Solanum melongena）, for the treatment of various important dyes used in textile and other industries. The ammonium sulphate fractionated enzyme preparations were used to treat a number of dyes under various experimental conditions. Majority of the treated dyes were maximally decolorized at pH 3.0. Some of the dyes were quickly decolorized whereas others were marginally decolorized. The initial first hour was sufficient for the maximum decolorization of dyes. The rate of decolorization was quite slow on long treatment of dyes. Enhancement in the dye decolorization was noticed on increasing the concentration of enzymes. The complex mixtures of dyes were treated with both preparations of polyphenol oxidases in the buffers of varying pH values. Potato polyphenol oxidase was significantly more effective in decolorizing the dyes to higher extent as compared to the enzyme obtained from brinjal polyphenol oxidase. Decolorization of dyes and their mixtures, followed by the formation of an insoluble precipitate, which could be easily removed simply by centrifugation.

关键词： decolorization textile dyes polyphenol oxidases potato brinjal wastewater treatment removal of dyes

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Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiberreinforced concrete railway sleepers

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Frontiers of Structural and Civil Engineering 2023年第3期17卷 411-428页

作者： Sayed AHMED Hossam ATEF Mohamed husain Department of Structural Engineering Faculty of EngineeringZagazig UniversityZagazig 44519Egypt Track Work Department National Authority for TunnelsCairo 11522Egypt

In this study,ultrahigh-performance fiber-reinforced concrete(UHPFRC)used in a type B70 concrete sleeper is investigated experimentally and *** main parameters investigated are the steel fiber volume fractions(0%,0.5%,1%,and 1.5%).Under European standards,35 UHPFRC sleepers are subjected to static bending tests at the center and rail seat sections,and the screw on the fastening system is pulled *** first cracking load,failure load,failure mode,crack propagation,load–deflection curve,load–crack width,and failure load from these tests are measured and compared with those of a control sleeper manufactured using normal concrete *** accuracy of the parametric study is verified ***,the results of the study are applied to UHPFRC sleepers with different concrete volumes to investigate the effects of the properties of UHPFRC on their *** and parametric study results show that the behavior of UHPFRC sleepers improves significantly when the amount of steel fiber in the mix is *** manufactured using UHPFRC with a steel fiber volume fraction of 1%and a concrete volume less than 25%that of standard sleeper B70 can be used under the same loads and requirements,which contributes positively to the cost and surrounding environment.

关键词： pre-stressed concrete sleeper ultrahigh performance fiber-reinforced concrete pull-out test static bending test steel fiber aspect ratio volume fraction

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Effect of friction stir processing on mechanical properties and heat transfer of TIG welded joint of AA6061 and AA7075

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Defence Technology（防务技术） 2021年第3期17卷 715-727页

作者： husain Mehdi R.S.Mishra Department of Mechanical Engineering Delhi Technological UniversityDelhiIndia

Tungsten inert gas(TIG) welding is the most commonly used joining process for aluminum alloy for AA6061 and AA7075 which are highly demanded in the aerospace engineering and the automobile sector, but there are some defects occur during TIG welding like micro-crack, coarse grain structure, and porosity. To improve these defects, the TIG welded joint is processed using friction stir processing(FSP).This paper presents the effect of friction stir processing on TIG welding with filler ER4043 and ER 5356 for dissimilar aluminum alloy AA6061 and AA7075. The mechanical characterization, finite element formulation and mathematical equations of heat transfer of TIG + FSP welded joints are investigated using ANSYS Fluent software by adjusting process parameters of FSP. The results show that the maximum compressive residual stress 73 MPa was obtained at the fusion zone(FZ) of the TIG weldment with filler ER4043, whereas minimum compressive residual stress 37 MPa was obtained at stir zone(SZ) of the TIG+ FSP with filler 5356. The maximum heat flux 5.33 × 106 W/m2 and temperature 515C have observed at tool rotation 1600 rpm with a feed rate of 63 mm/min. These results give a satisfactory measure of confidence in the fidelity of the simulation。

关键词： Residual stress TIG+FSW Heat transfer Micro-hardness Tensile strength

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Analysis and correction of linear optics errors,and operational improvements in the Indus-2 storage ring

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Chinese Physics C 2017年第8期41卷 130-142页

作者： Riyasat husain A.D.Ghodke Accelerator Physics Section Raja Ramanna Centre for Advanced TechnologyIndore452013India Homi Bhabha National Institute Training School ComplexAnushakti NagarMumbai 400094India

Estimation and correction of the optics errors in an operational storage ring is always vital to achieve the design performance. To achieve this task, the most suitable and widely used technique, called linear optics from closed orbit（LOCO） is used in almost all storage ring based synchrotron radiation sources. In this technique, based on the response matrix fit, errors in the quadrupole strengths, beam position monitor（BPM） gains, orbit corrector calibration factors etc. can be obtained. For correction of the optics, suitable changes in the quadrupole strengths can be applied through the driving currents of the quadrupole power supplies to achieve the desired optics. The LOCO code has been used at the Indus-2 storage ring for the first time. The estimation of linear beam optics errors and their correction to minimize the distortion of linear beam dynamical parameters by using the installed number of quadrupole power supplies is discussed. After the optics correction, the performance of the storage ring is improved in terms of better beam injection/accumulation, reduced beam loss during energy ramping, and improvement in beam lifetime. It is also useful in controlling the leakage in the orbit bump required for machine studies or for commissioning of new beamlines.

关键词： LOCO code beta-beat betatron coupling beam lifetime Indus-2 storage ring

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Optimal placement of magnets in Indus-2 storage ring

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Chinese Physics C 2015年第3期39卷 58-65页

作者： Riyasat husain A D Ghodke Gurnam Singh Raja Ramanna Centre for Advanced Technology

In Indus-2, by optimizing the position of the magnetic elements, using the simulated annealing algorithm, at different locations in the ring with their field errors, the effects on beam parameters have been minimized. Closed orbit distortion and beta beat are considerably reduced by optimizing the dipole and quadrupole magnets positions in the ring. For the Indus-2 storage ring, sextupole optimization gives insignificant improvement in dynamic aperture with chromaticity-correcting sextupoles. The magnets have been placed in the ring with the optimized sequence and storage of the beam has been achieved at injection energy without energizing any corrector magnets. Magnet sorting has led to the easy beam current accumulation and the measurement of parameters such as closed orbit distortion, beta function, dispersion, dynamic aperture etc.

关键词： sorting magnet-to-magnet errors beta beat closed orbit distortion dynamic aperture simulatedannealing

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Seroprevalence of cysticercosis in North Indian population

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Asian Pacific Journal of Tropical Medicine 2010年第8期3卷 589-593页

作者： Nitin Shukla Nuzhat husain Vimala Venkatesh Jamal Masood Mazhar husain Department of Pathology CSM Medical UniversityLucknow-3Uttar Pradesh.India Department of Microbiology CSM Medical UniversityLucknow-3Uttar PradeshIndia Department of Community Medicine CSM Medical UniversityLucknow-3Uttar PradeshIndia Department of Neurosurgery CSM Medical UniversityLucknow-3Uttar PradeshIndia

Objective:To estimate the seroprevalence,morbidity of Taenia solium(***) cysticercosis and its relationship to socio-economic,sanitary ***:Using multistage stratified random sampling.2 500 subjects from urban(n=1 250) and rural population(n =1 250) of Lucknow. India were ***,stool samples,socioeconomic and demographic data were collected. Serum enzyme-linked-immunosorbent-assay(ELISA) was used to detect anticysticercus IgG and IgM *** examination of stool samples after processing by concentration method was done to observe taeniasis and other intestinal *** scan of seropositive cases presenting with seizures was done for confirmation of ***:The overall,urban and rural seroprevalence of *** cysticercosis was 3.48%,4.64%and 2.32%, *** risk factors significantly associated with the disease were pig rearing in both study populations,unsanitary waste disposal in urban,vegetarian diet and open defecation in rural *** case of intestinal taeniasis was ***-six of 30 cases undergoing CT scan were diagnosed as ***:Seroprevalence of cysticercosis is high in the study *** of cysticercosis is related to roaming pigs and behavioral and environmental practices in local *** education and identification of tapeworm carriers seems promising control strategy.

关键词： Cysticercosis Community Seroprevalence North India Taenia solium ELISA

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