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Journal of Traffic and Transportation Engineering(English Edition) 2022年第1期9卷 78-92页

作者： avinash Talkeri A.U.Ravi Shankar Department of Civil Engineering National Institute of Technology KarnatakaSurathkalMangalore 575025India

This study aims to develop the alkali activated slag-fly ash concrete(AASFC) using precious slag(PS) ball as the fine aggregate. The slag-fly ash proportion, sodium silicate/sodium hydroxide(SS/SH) ratio and sodium hydroxide concentration are the prime variables. The fresh concrete properties like workability, setting time and the hardened concrete properties of AASFC developed under ambient curing were analyzed and similar way by replacing with fly ash(FA). The sodium hydroxide concentration of 8 M, 10 M and 12 M, SS/SH ratio of 1.0, 1.5 and 2.0, alkaline liquid to binder ratio of 0.35 and variation in slag-fly ash proportion as major inputs for mix design. The test results showed that, the fresh state of AASFC blend has a shorter setting time of 12-16 min, because of calcium mineral from the FA, the workability and setting time of AASFC mix was enhanced by the addition of the trisodium phosphate as a retarder. At the higher SS/SH extent, the workability and setting time exaggerated, whereas the increased FA content and sodium hydroxide concentration had a greater influence on the fresh state of concrete. Also, the sodium hydroxide concentration, SS/SH ratio and slag-fly ash proportion are the most inducing parameters on the workability, setting time and strength parameters of AASFC.

关键词： Road engineering Slag-fly ash proportion SS/SH ratio Molarity AASFC PS ball

Satellite Data-based Structural Mapping Reveals Active Panjal Traps Fault(PTF)in Kashmir,NW Himalaya

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Acta Geologica Sinica(English Edition) 2024年第S01期98卷 58-61页

作者： Afroz Ahmad SHAH Muhammad Gazali RACHMAN Anushka vashistha Ajay DASHORA Geosciences Programme Faculty of ScienceUniversity Brunei DarussalamBE1410Brunei Universitas Pembangunan Nasional“Veteran” Yogyakarta 55283Indonesia Department of Civil Engineering Indian Institute of Technology GuwahatiAssam 781039India

Exploring the evidence for unidentified earthquake-causing faults in the orogenic zones,and primarily the interior parts(Shah,2013),has been an ongoing quest for centuries(Willis,1923;Baker et al.,1988;Yeats et al.,1992;Wesnousky et al.,1999;Malik et al.,2010;Coudurier-Curveur et al.,2020;Shah et al.,2020).These faults are potentially dangerous due to their unknown risk and deformation budget,two of the most important aspects of mapping and understanding the vulnerability and hazards associated with active faults.

关键词： gravitational tectonics active tectonics normal faults deformation domains Himalaya

Quantification by allometric equations of carbon sequestered by Tectona grandis in different agroforestry systems

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Journal of Forestry Research 2013年第4期24卷 699-702页

作者： avinash Jain S.A.Ansari Tropical Forest Research Institute

Non destructive methods for quantification of carbon seques- tration in tropical trees are inadequately developed. We described a stan- dardized method for estimating carbon stock in teak （Tectona grandis Linn. F.）. We developed linear allometric equations using girth at breast height （GBH）, height and age to quantify above ground biomass （AGB）. We used AGB to estimate carbon stock for teak trees of different age groups （1.5, 3.5, 7.5, 13.5, 18.5 and 23.5 years）. The regression equation with GBH, y = 3.174x - 21.27, r2=0.898 （p 〈0.01）, was found precise and convenient due to the difficulty in determination of height and age in dense natural forests of teak. The equation was evaluated in teak agroforestry systems that included Triticum aestivum （wheat）, Cicer arietinum （gram）, Withania somnifera （ashwagandha）,

关键词： Tectona grandis agroforestry system allometric equation carbon sequestration above ground biomass

Characterization of saline soil for the halophytes of largest inland saline wetland of India using geospatial technology

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Journal of Oceanology and Limnology 2023年第4期41卷 1277-1291页

作者： Naik RAJASHREE Sharma LAXMI KANT Singh avinash Department of Environmental Science School of Earth SciencesCentral University of RajasthanBandarsindriAjmer 305817India

About 23%of the surface area and 44%of the volume of all the lakes are occupied by saline lakes in the ***,agricultural diversion,illegal encroachment,pollution,and invasive species could cause these lakes to dry up completely or partially by *** saltpan encroachment is causing Sambhar,India’s largest saline lake,to shrink by 4.23%every *** study aims to characterize the soil parameters where halophytes are growing.A literature survey was conducted for halophytes and soil *** study area was divided into four zones for stratified random *** sampling was conducted in February *** soil indicators for halophyte selected were pH,electrical conductivity,moisture,salinity,organic carbon,and organic *** obtained results were interpolated in the geospatial platform for soil characteristic *** is found that no research is conducted on halophytes of the *** on soil are also inconsistent and only six common parameters could be *** show that the pH ranged 9.37-7.66,electrical conductivity was 16.1-0.38,moisture 23.37%-1.2%,organic carbon 3.29%-0.15%,organic matter 5.6%-0.2%,and salinity 8.86%-0.72%.Though these results show improved condition as compared to last few years,in long term,the lake is *** the UN Decade of Ecosystem Restoration(2021-2030),if these causes are not addressed,the ecosystem may completely dry up.

关键词： halophytes inland lakes saline wetlands soil geospatial mapping interpolation

Pattern of spatial variability in granulometric and mineralogical characteristics across an ecologically sensitive sub-tropical wetland(Bihar, India)

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International Journal of Sediment Research 2023年第4期38卷 516-529页

作者： Alvia Aslam Rajesh Kumar Ranjan avinash Dass Department of Environmental Science Central University of South Bihar

Floodplain wetlands are dynamic systems undergoing frequent hydro-sedimentological changes. Tropical/subtropical wetlands have even more pronounced climatic and biological influences on the sediment dynamics. In the current study, a protected subtropical wetland in Bihar(India) has been assessed for its sedimentary and mineralogical status. Sediment characteristics and associated granulometric parameters are discussed to highlight the wetland’s hydrogeomorphic character, energy dimension, and the depositional processes taking place. Statistical grain size parameters like graphic mean, graphic skewness,graphic kurtosis, and their interrelations studies have helped in understanding the sources of deposited materials. Multivariate statistics have identified, sand fractions, measures of central tendencies(mean,median, and mode), percent organic matter(%OM) and percent carbonates(%carbonates) as primary factors explaining the maximum variance in the data. The non-parametric Kruskal-Wallis test has identified %sand, %clay, electrical conductivity(EC), and %carbonates as the major factors responsible for significant spatial variability. The grain texture analysis shows that the majority of samples fall in the brackets of clayey silt; silty sand; and sand, silt, and clay. Common mineral components associated with these are quartz, feldspar, clay minerals, etc. The range for the mean grain size lies between 3Φ to 9Φ(Φ is diameter of the sediments) where most of the grain size distributions are symmetrically to fine symmetrically skewed, indicating intermediate energy to adjust to environmental conditions. The granulometric and physicochemical characteristics of the sediment samples also indicate the directional distribution pattern of sediment along the hydrological pathway. Future studies concentrating on the fluvial discharges of water and sediment will be highly insightful in reconstructing the past net sediment accumulation processes in the Baraila Wetland.

关键词： Grain size analysis Hydrodynamic energy Mineralogy Allogenic source Terrigenous input Wetland

Chemical pre-treatments improve seed germination and seedling growth in Semecarpus kurzii:an ethnomedicinally important plant

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Journal of Forestry Research 2018年第5期29卷 1283-1289页

作者： Ajit Arun Waman Pooja Bohra avinash Norman Division of Horticulture and Forestry ICAR-Central Island Agricultural Research Institute

Semecarpus kurzii *** an important ethnomedicinal plant used for curing tumours,inflammation,fever and pain,and is also a source of iso ricinoleic *** the present investigation,effect of chemical pretreatments on germination and seedling growth revealed significant *** pre-treatments could improve germination and treatment with KNO_3 （9.9 mM）was significantly superior（94%） to the untreated control（76%）.Mean daily germination varied among the treatments（0.90–4.14 seeds per day）,when compared with 2.27 seeds per day in *** germination time was significantly reduced from 22.14 days（control） to 16.40 days（19.8 mM KNO_3） and 17.16 days（1.45 mM GA_3）.Treatment with KNO_3（19.8 mM） and GA_3（1.45 and 2.90 mM）significantly reduced the time for 50% *** with higher concentrations of GA_3 and KNO_3 exhibited significantly faster germination initiation（11.0 and 12.0 days,respectively） over the control（17.0 days）.Seedling vigour index was not improved by *** treatments did not improve shoot growth,collar thickness,or number of seedling leaves; however,root growth was significantly improved over *** with GA_3（2.90 mM） promoted leaf elongation but reduced leaf width *** with KNO_3 and GA_3 could be recommended to obtain healthy seedlings for establishing new plantations of this important medicinal plant species.

关键词： Conservation Indian system of medicines Tribal healthcare Wild cashew

Basin Geomorphology and Drainage Morphometry Parameters Used as Indicators for Groundwater Prospect: Insight from Geographical Information System(GIS) Technique

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Journal of Earth Science 2014年第6期25卷 1018-1032页

作者： Kumar avinash B Deepika K S Jayappa National Centre for Antarctic & Ocean Research Department of Marine Geology Mangalore University

Influence of structural and lithological controls of various drainage patterns and their stream orientations（for 2nd, 3rd and 4th order steams） were identified to evaluate the direction and controlling factors of drainage network. To investigate the prospect of groundwater, hydrogeomorphological features of river basin viz. Mulki-Pavanje were identified and mapped. To evaluate the characteristics of the basin, different morphometric parameters（linear, areal and relief） were computed in sub-basin wise（SB-I to-VII）. The linear parameters suggest drainage network is controlled by geomorphology. The form factor（Ff）, elongation ratio（Re） and circularity ratio（Rc） suggest that the basin is in an elongated shape. The drainage density（Dd） indicates resistant/permeable strata under medium-dense vegetation with moderate relief. The areal parameters of the sub-basins（except SBI and Ⅲ） indicates moderate ground-slopes associated with moderately permeable rocks, which promote moderate run-off and infiltration. Drainage texture（T） of the whole basin indicates coarse texture while the SB-I, and Ⅲ showing an intermediate texture. The relief parameters namely ruggedness number（Rn） infers low basin relief and poor drainage density. To identify the most deficit/surplus zones of groundwater suitable weightages were assigned to the hydrogeomorphological units and morphometric parameters. The study reveal that the basin manifest that SB-Ⅲ shall be most deficit zone of groundwater, whereas SB-VII, VI and V are found to show increase in groundwater potentiality. Groundwater prospect area in this basin is estimated to be 7% area under poor, 44% area under moderate and 49% area under good to excellent. This paper demonstrated the potential application of geographical information system（GIS） techniques to evaluate the groundwater prospect in absence of traditional groundwater monitoring data.

关键词： hydrogeomorphology drainage morphometry prioritization groundwater prospect Mulki-Pavanje River Basin remote sensing

Development of port fuel injected methanol(M85)-fuelled two-wheeler for sustainable transport

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第3期7卷 298-311页

作者： Tushar Agarwal Akhilendra Pratap Singh avinash Kumar Agarwal Engine R esearch Laboratory Department of Mechanical EngineeringIndian Institute of Technology KanpurKanpur 208016India

Due to increasingly stringent environmental pollution norms,there is a need for alternate combustion techniques and alternate fuels to keep up with changing *** of the viable solutions for India is the adaptation of methanol as a fuel for automotive ***,in this study a functional two-wheeler prototype was developed,which uses M85(85%v/v methanol and 15%v/v gasoline)in an electronic control unit(ECU)controlled port fuel injected(PFI)*** study included comparative investigations of simulated on-road two-wheeler performance on chassis dynamometer using a gasoline-fuelled motorcycle with stock ECU vis-a-vis M85-fuelled motorcycle using recalibrated *** recalibration exhibited that M85-fuelled vehicle was operated at relatively more advanced spark timing compared to baseline gasoline-fuelled *** results showed that M85-fuelled motorcycle produced relatively higher engine power and higher maximum vehicle speed compared to gasoline-fuelled *** superior acceleration characteristics(especially at higher speeds)of M85-fuelled motorcycle was another important finding of this study,indicating that M85 provided superior throttle response compared to *** analysis of raw tailpipe emissions showed that modified M85-fuelled motorcycle emitted relatively higher hydrocarbon(HC),carbon monoxide(CO)and oxides of nitrogen(NO_x)emissions compared to stock gasoline-fuelled ***,these emissions can be controlled by using adaptation of suitable after-treatment systems.

关键词： Methanol Electronic control unit(ECU) Electronic fuel injection(EFI) ECU calibration Engine performance Emission

Simplified theoretical analysis and numerical study on the dynamic behavior of FCP under blast loads

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Frontiers of Structural and Civil Engineering 2020年第4期14卷 983-997页

作者： Chunfeng ZHAO Xin YE avinash GAUTAM Xin LU YLMO Anhui Key Laboratory of Civil Engineering Structures and Materials Hefei University of TechnologyHefei 230009China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024.China School of Civil Engineering Hefei University of TechnologyHefei 230009China Deparment of Civil and Environmental Enginering University of HoustonHoustonTX 77024USA

Precast concrete structures have developed rapidly in the last decades due to the advantages of better quality,non-pollution and fast construction with respect to conventional cast-in-place *** the present study,a theoretical model and nonlinear 3D model are developed and established to assess the dynamic behavior of precast concrete slabs under blast *** first,the 3D model is validated by an experiment performed by other *** verified model is adopted to investigate the blast performance of fabricated concrete panels(FCPs)in terms of parameters of the explosive charge,panel thickness,and reinforcement ***,a simplified theoretical model of the FCP under blast load is developed to predict the maximum *** is indicated that the theoretical model can precisely predict the maximum displacement of FCP under blast *** results show that the failure modes of the panels varied from bending failure to shear failure with the mass of TNT *** thickness of the panel,reinforcement ratio,and explosive charges have significant effects on the anti-blast capacity of the FCPs.

关键词： precast structure fabricated concrete panel blast resistance theory model empirical equation