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Journal of Traffic and Transportation Engineering(English Edition) 2018年第4期5卷 296-308页

作者： Wael Jamous chandra Balijepalli Institute for Transport Studies University of Leeds AECOM

Roadworks are perhaps the most controversial topic in transport professional field. On one hand, they are a necessity to assure the current and future functionality of the traffic network, while on the other, they are seen as a major disturbance by road users with concerns for excessive travel time delays. The impact of roadworks is usually analysed at a local level however the network-wide effects are crucial to ensure reliable travel times. Moreover the analysis usually focusses on private cars and the reliability impact on public transport services are too important to ignore. This paper investigates the impact of roadworks undertaken on a given road link over wider parts of the network and assesses travel time reliability for both cars and buses. This research involves setting up of a con- ventional network assignment model to arrive at the route choice of drivers as a result of the roadworks and then integrates the outcomes with a microsimulation model to generate space-time trajectories to arrive at travel times of individual vehicles. We adopted a reli- ability measure from the literature to compute travel time reliability of a given type of vehicle by unique origin-destination （O-D） pair combinations and also more generally to provide a wider picture at an aggregated network level. The method was tested on a real life network in England, and travel time reliability results were analysed both at the network scale and significant O-D pair level for private cars and bus routes.

关键词： Traffic network Roadworks Travel time reliability Assignment modelling

Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles

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Chinese Physics B 2015年第4期24卷 296-299页

作者： Anjan Das Atis chandra Mandal P.M.G.Nambissan Department of Physics A.P.C.Roy Government College Department of Physics University of Burdwan Applied Nuclear Physics Division Saha Institute of Nuclear Physics

Very small nickel oxide nanoparticles were prepared by a sol-gel procedure using nickel nitrate hexahydrate and ammonium hydroxide as precursors. The particles are in the range of 5 nm-11 rim. The x-ray diffraction （XRD） crystallography and high resolution transmission electron microscopy （HRTEM） were employed to characterize the samples. They were found to be polycrystalline in nature and fcc （NaCl-type） in structure, with the lattice parameter varying with annealing temperature. HRTEM pictures show that the as-prepared samples are hexagonal in shape. Positron annihilation spectroscopy was used to investigate the Doppler-broadened spectra of the samples. The S and W parameters revealed that the chemical surroundings and momentum distribution of the vacancy clusters vary with crystallite size.

关键词： nanoparticles semiconductor defect cluster positron annihilation sol-gel

Temporal variation of solar flare index during solar cycles 21–24

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Research in Astronomy and Astrophysics 2021年第3期21卷 21-33页

作者： Soumya Roy Amrita Prasad Subhash chandra Panja Sankar Narayan Patra Department of Applied Electronics and Instrumentation Engineering Haldia Institute of TechnologyHaldiaMidnapore(E)-721657West BengalIndia Department of Mechanical Engineering Jadavpur UniversityKolkata-700032West BengalIndia Department of Instrumentation and Electronics Engineering Jadavpur UniversityKolkata-700106West BengalIndia

The present investigation attempts to quantify the temporal variation of Solar Flare Index(SFI)with other activity indices during solar cycles 21-24 by using different techniques such as linear regression,correlation,cross-correlation with phase lag-lead,*** Solar Activity Indices(SAI)considered in this present study are Sunspot Number(SSN),10.7 cm Solar Radio Flux(F10.7),Coronal Index(CI)and MgⅡCore-to-Wing Ratio(MgⅡ).The maximum cycle amplitude of SFI and considered SAI has a decreasing trend from solar cycle 22,and cycle 24 is the weakest solar cycle among all other *** SFI with SSN,F10.7,CI and MgⅡshows hysteresis during all cycles except for solar cycle 22 where both paths for ascending and descending phases are intercepting each other,thereby representing a phase reversal.A positive hysteresis circulation exists between SFI and considered SAI during solar cycles 22 and 23,whereas a negative circulation exists in cycles 21 and *** has a high positive correlation with coefficient values of 0.92,0.94,0.84 and 0.81 for SSN,F10.7,CI and MgⅡ*** to crosscorrelation analysis,SFI has a phase lag with considered SAI during an odd-number solar cycle(solar cycles21 and 23)but no phase lag/lead during an even-numbered solar cycle(solar cycles 22 and 24).However,the entire smoothed monthly average SFI data indicate an in-phase relationship with SSN,F10.7 and MgⅡ,and a one-month phase lag with *** presence of those above characteristics strongly confirms the outcomes of different research work with various solar indices and the highest correlation exists between SFI and SSN as well as F10.7 which establishes that SFI may be considered as one of the prime activity indices to interpret the characteristics of the Sun’s active region as well as for more accurate short-range or long-range forecasting of solar events.

关键词： Methods:data analysis Methods:statistical Sun:activity Sun:flares Sun:general

White grubs, Holotrichia rustica and Holotrichia mucida （Coleoptera： Scarabaeidae） as pests of teak （Tectona grandis L. f.） seedlings

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Insect Science 2009年第6期16卷 519-525页

作者： Nitin Kulkarni Sanjay Paunikar Kailash chandra Joshi John Rogers Tropical Forest Research Institute Jabalpur India Research Connections and Consulting P.O. Box 350 Toowong Queensland 4066 Australia

Field observations were carried out between 2002 and 2005 on bio-ecology of white grubs infesting teak （Tectona grandis Linn. f.） seedlings at Ramdongari Forest Nursery, Forest Development Corporation of Maharashtra, Nagpur in central India. The study collected the data required for an integrated pest management strategy against the white grubs. The species damaging teak seedlings were Holotrichia rustica （Burmeister） and H. mucida Gyllenhal. The beetles （adults） of both these species began to emerge just after the pre-monsoon showers and when the relative humidity had risen rapidly over several days, but before the first monsoon rains. While the adults fed and mated on naturally growing bushes of Ziziphus jujuba, Z mauritiana, Z. xylopyra, Acacia leucophloea and A. catechu immediately after the emergence from the teak beds in the nursery, the immature stages （grubs） of both species fed on roots of the teak seedling, leading to plant death. This is the first report of （i） damage caused to teak seedlings by grubs ofH. rustica and H. mucida, and （ii） of *** and Z. mauritiana being hosts for the beetles ofH. mucida and H, rustica. It is also the first detailed report on the field bio-ecology of the H. rustica and H. mucida as major pests ofteak. White grubs are among the toughest-to-manage pests of economic importance and information presented here on the pest incidence and damage ofH. rustica and H. mucida is important to researchers and nursery field managers for the management of these pests on teak.

关键词： adult emergence chafer beetles environmental factors incidence Indian scarabs insect pests Melolonthinae population density Ziziphus

Advances in Hyperspectral Image Classification Based on Convolutional Neural Networks: A Review

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Computer Modeling in Engineering & Sciences 2022年第11期133卷 219-250页

作者： Somenath Bera Vimal K.Shrivastava Suresh chandra Satapathy School of Computer Science and Engineering Lovely Professional UniversityPhagwara144411India School of Electronics Engineering Kalinga Institute of Industrial Technology(KIIT)Bhubaneswar751024India School of Computer Engineering Kalinga Institute of Industrial Technology(KIIT)Bhubaneswar751024India

Hyperspectral image(HSI)classification has been one of themost important tasks in the remote sensing community over the last few *** to the presence of highly correlated bands and limited training samples in HSI,discriminative feature extraction was challenging for traditional machine learning ***,deep learning based methods have been recognized as powerful feature extraction tool and have drawn a significant amount of attention in HSI *** various deep learning models,convolutional neural networks(CNNs)have shown huge success and offered great potential to yield high performance in HSI *** by this successful performance,this paper presents a systematic review of different CNN architectures for HSI classification and provides some future *** accomplish this,our study has taken a few important ***,we have focused on different CNN architectures,which are able to extract spectral,spatial,and joint spectral-spatial ***,many publications related to CNN based HSI classifications have been reviewed ***,a detailed comparative performance analysis has been presented between four CNN models namely 1D CNN,2D CNN,3D CNN,and feature fusion based CNN(FFCNN).Four benchmark HSI datasets have been used in our experiment for evaluating the ***,we concluded the paper with challenges on CNN based HSI classification and future guidelines that may help the researchers to work on HSI classification using CNN.

关键词： Convolutional neural network deep learning feature fusion hyperspectral image classification review spectralspatial feature

Application of hopcalite catalyst for controlling carbon monoxide emission at cold-start emission conditions

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第5期6卷 419-440页

作者： Subhashish Dey Ganesh chandra Dhal Devendra Mohan Ram Prasad Department of Civil Engineering Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India Department of Chemical Engineering and Technology Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India

Carbon monoxide(CO) is a poisonous gas particularly to all leaving being present in the *** estimate has shown that the vehicular exhaust contributes the largest source of CO pollution in developed *** to the exponentially increasing number of automobile vehicles on roads,CO concentrations have reached an alarming level in urban *** control this vehicular exhaust pollution,the end-of-pipe-technology using catalytic converters is *** catalysts operating efficiently in a catalytic converter are a challenging class of materials for applications in cold start of engines to maintain indoor air *** the cold start period,the catalytic converter was entirely inactive,because the catalytic converter had not been warmed *** cold start phase is also depending upon the characteristics of vehicles and property of *** increasing cost of noble metals with the increasing number of vehicles motivates the investigation of material concepts to reduce the precious metal content in automotive catalysts or to find a substitute for noble ***(CuMnOx) catalyst could work very well at the low temperature;thus,it can overcome the problem of cold-start emissions if used in a catalytic ***,low cost,easy availability and advanced synthesis methods with stabilizer,promoter,etc.,advocates for the use of hopcalite as an auto exhaust purification *** there are numerous research articles present on this topic until now,no review has been presented for demanding this *** there is a space in this area,and it has been made an attempt to seal this hole and progress the future scope for hopcalite catalyst for purification of exhaust gases by this review.

关键词： Automobile vehicle Hopcalite catalyst Catalytic converter applications Cold start emission Carbon monoxide

Variations of the harmonic components of the X-ray pulse profile of PSR B1509–58

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Research in Astronomy and Astrophysics 2015年第1期15卷 28-36页

作者： Pragati Pradhan Biswajit Paul Harsha Raichur Bikash chandra Paul St Joseph’s College Singamari Darjeeling 734104 West Bengal India North Bengal University Raja Rammohanpur District Darjeeling 734013 West Bengal India Raman Research Institute Sadashivnagar Bangalore 560080 India

We used the Fourier decomposition technique to investigate the stability of the X-ray pulse profile of a young pulsar PSR B1509–58 by studying the relative amplitudes and phase differences of its harmonic components with respect to the fundamental using data from the Rossi X-Ray Timing Explorer. Like most young rotation powered pulsars, PSR B1509–58 has a high spin down rate. It also has less timing noise, allowing accurate measurement of higher order frequency derivatives which in turn helps in the study of the physics of pulsar spin down. Detailed investigation of pulse profiles over the years will help us establish any possible connection between the timing characteristics and the high energy emission characteristics for this ***, the study of pulse profiles of short period X-ray pulsars can also be useful when used as a means of interplanetary navigation. The X-ray pulse profile of this source has been analyzed for 15 yr（1996–2011）. The long term average amplitudes of the first, second and third harmonics（and their standard deviation for individual measurements） compared to the fundamental are 36.9%（1.7%）, 13.4%（1.9%） and 9.4%（1.8%） respectively. Similarly, the phases of the three harmonics（and standard deviations） with respect to the fundamental are 0.36（0.06）, 1.5（0.2） and 2.5（0.3） radian respectively. We do not find any significant variation of the harmonic components of the pulse profile in comparison to the fundamental.

关键词： pulsars: individual:(PSR B1509–58) stars: neutron X-rays

Queue clearance rate method for estimating passenger car equivalents at signalized intersections

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Journal of Traffic and Transportation Engineering(English Edition) 2017年第5期4卷 487-495页

作者： Mithun Mohan Satish chandra Department of Civil Engineering Indian Institute of Technology RoorkeeRoorkee 247667India Central Road Research Institute New Delhi 110025India

This study explored the use of queue clearance rate method for estimating passenger car equivalent （PCE） at signalized intersections. PCE was estimated based on the assumption that the rate at which a queue of vehicles clears the intersection is a function of its composition. Results of this method were compared with the results estimated by some popular techniques. A fourqegged intersection was simulated in VISSIM software and different techniques were used to convert the traffic mix into a uniform one. Parameters of VISSIM were modified to closely reflect the traffic behaviour under heterogeneous traffic conditions. All approaches of the intersection were loaded to saturated conditions and accuracy of estimated PCEs were established by comparing converted flow （PCE/h） with the capacity of an all-car traffic stream. Method based on saturation flow delivered the best result, but its use was limited to traffic composed only of two types of vehicles. Results of regression and optimization techniques were almost similar and the converted flow was close to the capacity of all-car stream. However, accuracy of these methods strongly relied on the correct measurement of saturation flow. Queue clearance rate method did not require value of saturation flow and yielded good estimates of PCE throughout the simu- lation runs. The maximum difference between the converted flow and capacity estimated with all car situations was found to be less than 10% in all cases considered in this study.

关键词： Passenger car equivalents Signalized intersection Queue clearance rate method Simulation VISSIM

Navigating the hydrogen prospect:A comprehensive review of sustainable source-based production technologies,transport solutions,advanced storage mechanisms,and CCUS integration

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Journal of Energy Chemistry 2024年第10期97卷 166-215,I0005页

作者： Sehar Tasleem chandra Sekhar Bongu Mohan Raj Krishnan Edreese Housni Alsharaeh College of Science and General Studies Alfaisal UniversityPO Box 50927Riyadh 11533Saudi Arabia

The review is a comprehensive discussion of current research advances,commercial scale developments,challenges,and techno-eco nomics for the entire H_(2) value chain,including production,mainly focusing on sustainable sources,storage,and *** challenges,advantages,and uses of H_(2) energy are included at ***,apart from the sustainable production approaches,the approaches and current developments for combating the carbon dioxide(CO_(2))emissions from existing H_(2) production facilities are highlighted in terms of ca rbon capture,utilization,and storage(CCUS).Concisely,the review discusses current material and recent technological adva ncements in developing pilot projects and large-scale establishments for viable and rapidly emerging sou rce-ba sed H_(2) productio ***,the review also aims to provide an in-depthdiscussion and explore current developments based on the advantages of H_(2) energy in terms of its utilization,based on its high energy density,and its ability to be used as a feedstock and *** the other hand,the challenges of H_(2) are also elabo ***,the role of CCUS in a carbon-neutral economy and value chain for minimization of emissions from existing facilities is thoroughly deliberated,and the recent commercial-scale implementation of CCUS technologies is *** the utilization and recycling of captured CO_(2) emissions along with H_(2) to produce e-fuels in terms of current advances is detailed in this *** rthermore,the most applicable,efficient,a nd develo ping approaches are discussed for physical and chemical H_(2) storage,considering recent la rge-scale implementations of liquid carriers and liquid organic hydrogen carriers as storage ***,the review elaborates on recent insights into advances in H_(2) transport infrastructure,including compressed and liquid H_(2) delivery via roads,ships,pipelines,and flight *** review gives precise insights into the recent scenario through

关键词： Source-based hydrogen Hydrogen utilization Carbon capture E-fuels Hydrogen storage Transport infrastructure

Phosphinic Acid/Nal Mediated Reductive Cyclization Approach for Accessing the L-1-Deoxynojirimycin Using a Two-Component Three-Centered (2C3C) Ugi Type Reaction

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Chinese Journal of Chemistry 2021年第6期39卷 1503-1510页

作者： chandra S Azad Pratibha Shukla Mark A Olson Anudeep K Narula Institute for Molecular Design and Synthesis School of Pharmaceutical Science&TechnologyHealth Science PlatformTianjin University92 Weijin RoadNankai DistrictTianjin 300072China "Hygeia" Centre of Excellence in Pharmaceutical SciencesGuru Gobind Singh Indraprostho UniversitySector 16-CDwarkaNew Delhi 110078India Department of Chemistry Northwestern University2145 Sheridan RoodEvanstonIL 60208USA

A catalytic two-component three-centered(2C3C)Ugi-type reaction was developed for the synthesis of L-1-deoxynojirimycin(DNJ)isomers using a chiron *** new and quite mild catalytic system,comprised of phenylphosphinic ... 详细信息

关键词： Azasugars Multicomponent reactions Nitrilium ion Isocyanide Reductive cyclization