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Advantageous properties of halide perovskite quantum dots towards energy-efficient sustainable applications

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Green Energy & Environment 2024年第6期9卷 949-965页

作者： Qian Zhao Shuo Wang Young-Hoon Kim Shekhar Mondal Qingqing Miao Simiao Li Danya Liu Miao Wang Yaxin Zhai Jianbo Gao Abhijit hazarika Guo-Ran Li School of Materials Science and Engineering Nankai UniversityTianjin300350China Department of Energy Engineering Hanyang UniversitySeoul04763Republic of Korea Polymers and Functional Materials Division CSIR-Indian Institute of Chemical TechnologyUppal RoadTarnakHyderabad500007India Institute of Process Engineering Chinese Academy of SciencesBeijing100190China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of PhysicsHunan Normal UniversityChangshHunan410081China Department of Chemistry Brock University1812 Sir Isaac WaySt CatharinesOntarioCanada

As lead halide perovskite(LHP)semiconductors have shown tremendous promise in many application fields,and particularly made strong impact in the solar photovoltaic area,low dimensional quantum dot forms of these perovskites are showing the potential to make distinct marks in the fields of electronics,optoelectronics and *** so-called perovskite quantum dots(PQDs)not only possess the most important features of LHP materials,i.e.,the unusual high defect tolerance,but also demonstrate clear quantum size effects,along with exhibiting desirable optoelectronic properties such as near perfect photoluminescent quantum yield,multiple exciton generation and slow hot-carrier ***,we review the advantageous properties of these nanoscale perovskites and survey the prospects for diverse applications which include lightemitting devices,solar cells,photocatalysts,lasers,detectors and memristors,emphasizing the distinct superiorities as well as the challenges.

关键词： Perovskite quantum dot Light-emitting Detector Laser Solar cell

Oriented attachment(OA) mediated characteristic growth of Gd_2O_3 nanorods from nanoparticle seeds

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Journal of Rare Earths 2016年第2期34卷 158-165页

作者： Samiran hazarika Dambarudhar Mohanta Nanoscience and Soft Matter Laboratory Department of Physics Tezpur University

Herein, we demonstrated the oriented attachment (OA) driven formation and characterization of Gd2O3 nanorods. The nanorods were synthesized via a surfactant free, inexpensive hydrothermal route and considering ~30 nm nanoparticles as the seed. While maintaining a cubic phase throughout the process, complete transformation of Gd2O3nanoparticles to nanorods was found to occur at an elevated temperature (~180 oC) of the hydrothermal reaction. The elongated Gd2O3 nanostructures, as revealed from transmission electron microscopic imaging, possessed an average diameter of ~33 nm and an approximate length of 172 nm. From the kinetics of OA process, the activation energy of formation was estimated to be ~25 kJ/mole. The existence of defect mediated radia-tive emission was ascertained from the asymmetric broadening of luminescence spectra. The defect emission arising from the Gd2O3 nanorods was nearly 1.4 times stronger than that of nanoparticles. The morphological evolution and growth kinetics were discussed along with the luminescence and electron paramagnetic resonance features.

关键词： nanorod hydrothermal oriented attachment rare-earth oxide

Knowledge,attitude,beliefs and practices in HIV/AIDS in India:identifying the gender and rural-urban differences

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Asian Pacific Journal of Tropical Medicine 2010年第10期3卷 821-827页

作者： Indrajit hazarika Indian Institute of Public Health

Objective:To promote the use of preventive measures and raise awareness regarding HIV/AIDS in ***:Data from the population-based NFHS-3 survey 2005-06 was *** this study,information collected on 87 961 women aged 15-49 years and 44 717 men aged 15-54 years was used in the final *** data collected was stratified by gender and place of residence. Analyses of the variables related to the outcomes ***,attitude,belief and practices, was conducted using Chi-square test to calculate significant differences among proportions of categorical ***:We found that knowledge of HIV transmission and prevention was low among women and rural *** of the respondents had a non-discriminatory attitude towards HIV positives and majority agreed that children should be educated on HIV/ *** use of condoms and proportion of respondents who had undergone HIV testing was found to be significantly *** found a significant gap in the beliefs regarding ways to avoid ***:There are significant gender and urban-rural differentials in India in terms of knowledge,attitude,beliefs and practices in HIV/*** dissemination in India should be designed in a way that not only raises the level of awareness but also result in behavioral change.

关键词： HIV/AIDS National AIDS Control Program NFHS-3 India

Some I-Convergent Sequence Spaces Defined by Orlicz Functions

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Acta Mathematicae Applicatae Sinica 2011年第1期27卷 149-154页

作者： Binod Chandra Tripathy Bipan hazarika Mathematical Sciences Division Institute of Advanced Study in Science and TechnologyPaschim BoragaonGarchukGuwahati-781 035AssamINDIA. Department of Mathematics Rajiv Gandhi UniversityDoimukhItanagar-791 112Arunachal PradeshINDIA.

In this article we introduce the sequence spaces cI（M）, c0I（M）, mI（M） and m0I（M） using the Orlicz function M. We study some of the properties like solid, symmetric, sequence algebra, etc and prove some inclusi... 详细信息

关键词： Ideal filter Orlicz function I-convergent I-null solid sequence algebra symmetric convergencefree

On Existence of Primitive Normal Elements of Cubic Form over Finite Fields

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Algebra Colloquium 2022年第1期29卷 151-166页

作者： Himangshu hazarika Dhiren Kumar Basnet Department of Mathematical Sciences Tezpur UniversityAssamIndia

For a prime p and a positive integer k,let q=p^(k) and F_(q)^(n) be the extension field of F_(q).We derive a sufficient condition for the existence of a primitive element α in F_(q)^(n) such that α^(3)-α+1 is also a primitive element of F_(q)^(n) ,a sufficient condition for the existence of a primitive normal element a in F_(q)^(n) over F_(q) such that α(3)-α+1 is a primitive element of F_(q)^(n) ,and a suficient condition for the existence of a primitive normal element a in F_(q)^(n) over F_(q) such that а^(3)-а+1 is also a primitive normal element of F_(q)^(n) over F_(q).

关键词： finite field primitive element free element normal basis character

Remote Sensing Image Retrieval Based on 3D-Local Ternary Pattern(LTP)Features and Non-subsampled Shearlet Transform(NSST)Domain Statistical Features

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Computer Modeling in Engineering & Sciences 2022年第4期131卷 137-164页

作者： Hilly Gohain Baruah Vijay Kumar Nath Deepika hazarika Department of Electronics and Communication Engineering Tezpur UniversityAssam784028India

With the increasing popularity of high-resolution remote sensing images,the remote sensing image retrieval(RSIR)has always been a topic of major issue.A combined,global non-subsampled shearlet transform(NSST)-domain statistical features(NSSTds)and local three dimensional local ternary pattern(3D-LTP)features,is proposed for high-resolution remote sensing *** model the NSST image coefficients of detail subbands using 2-state laplacian mixture(LM)distribution and its three parameters are estimated using Expectation-Maximization(EM)*** also calculate the statistical parameters such as subband kurtosis and skewness from detail subbands along with mean and standard deviation calculated from approximation subband,and concatenate all of them with the 2-state LM parameters to describe the global features of the *** various properties of NSST such as multiscale,localization and flexible directional sensitivity make it a suitable choice to provide an effective approximation of an *** order to extract the dense local features,a new 3D-LTP is proposed where dimension reduction is performed via selection of‘uniform’*** 3D-LTP is calculated from spatial RGB planes of the input *** proposed inter-channel 3D-LTP not only exploits the local texture information but the color information is captured ***,a fused feature representation(NSSTds-3DLTP)is proposed using new global(NSSTds)and local(3D-LTP)features to enhance the discriminativeness of *** retrieval performance of proposed NSSTds-3DLTP features are tested on three challenging remote sensing image datasets such as WHU-RS19,Aerial Image Dataset(AID)and PatternNet in terms of mean average precision(MAP),average normalized modified retrieval rank(ANMRR)and precision-recall(P-R)*** experimental results are encouraging and the NSSTds-3DLTP features leads to superior retrieval performance compared to many well known existing descriptors such as Gabor RGB,Granulometry,loc

关键词： Remote sensing image retrieval laplacian mixture model local ternary pattern statistical modeling,KS test,texture,global features

Thermal analysis of a constructal T-shaped porous fin with simultaneous heat and mass transfer

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Chinese Journal of Chemical Engineering 2017年第9期25卷 1121-1136页

作者： Saheera Azmi hazarika Tuhin Deshamukhya Dipankar Bhanja Sujit Nath Department of Mechanical Engineering National Institute of Technology

The present work establishes an analytical model for computing the temperature distribution, fin efficiency and optimum design parameters of a constructal T-shaped porous fin operating in fully wet condition. For more practical results, this study considers a cubic polynomial relationship between the humidity ratio of saturated air and the corresponding fin surface temperature. The temperature distribution has been determined by solving the highly non-linear governing equations using a semi-analytical transformation technique called Differential Transform Method. A comparison of the results with that of a numerical model shows that this transformation method is a very efficient and convenient tool for solution of non-linear problems. The effects of various geometric, thermo-physical and psychometric parameters on the temperature distribution, fin efficiency and optimum design condition have been investigated. Also, a comparison has been presented between solid and porous fins and the results point out that by selecting an appropriate value of porosity, the heat transfer rate can be increased than the corresponding solid fin.

关键词： Constructal Porous Mass transfer Analytical Optimization Differential Transform Method

Polymer flooding and its effects on enhanced oil recovery special reference to Upper Assam Basin

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Petroleum Research 2023年第1期8卷 54-62页

作者： Kalpajit hazarika Subrata Borgohain Gogoi Amit Kumar Presidency University BangaloreIndia Dibrugarh University AssamIndia Rajiv Gandhi Institute of Petroleum Technology JaisAmethiIndia

Chemical Enhance oil Recovery(CEOR)technology is getting more attention since energy crises are getting worse and *** application of polymer flooding depends on the evaluation of rheological and solution properties of injected slug at reservoir conditions,which is function of polymer concentration,salinity,temperature and shear *** acryl amide(PAM)is commonly used polymer in polymer flooding ***,comparative study with other polymers such as xanthan gum(XG)is required while selection of appropriate polymer for *** present study,the recovery efficiency of PAM and XG as a polymer has been evaluated for application as chemical EOR agent for tertiary phase polymer flooding in Upper Assam *** comparative study between PAM and XG has been done in terms of rheological *** flooding experiment of polymer flooding has also been tested to determine the recovery efficiency of the PAM and XG polymer *** results showed that these polymers exhibit favorable salt tolerance,temperature resistance,and recoverable viscosity after shearing,reasonable thickening behavior and improved viscosity enhancement properties due to presence of hydrophobic association in the polymer main *** flooding experiment of polymer flooding has also been tested to determine the recovery efficiency of the PAM and XG polymer *** show that macroscopic sweep efficiency is the dominant factor during *** an injection of hydrogel polymer to the reservoir is to increase a viscosity of fluid containing water so that the fluid is more difficult to flow than the oil,and as a result,the oil production *** thinning behavior was observed in case of PAM indicating predominance of the frontal advance *** PAM seems to be following both piston like movement and frontal advance theory it can be efficiently enhancing the macroscopic sweep efficiency as well as microscopic displacement *** overall

关键词： Rheology Polymer Macroscopic Microscopic EOR

Magma mixing dynamics in a vertically zoned granitic magma chamber inferred from feldspar disequilibrium assemblage and biotite composition: a case study from the Mikir Massif,eastern India

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Acta Geochimica 2022年第3期41卷 453-469页

作者： Gaurav hazarika Pallabi Basumatary Tribujjal Prakash Hiredya Chauhan Bibhuti Gogoi Department of Geology Cotton UniversityGuwahatiAssam 781001India Inter University Accelerator Centre New Delhi 110067India

The Kathalguri Pluton is a granitic pluton confined within the Palaeo-Mesoproterozoic Shillong Group of rocks in the Mikir Massif, eastern India. The pluton is vertically zoned characterized by lower medium-to coarsegrained equigranular to porphyritic granite and upper finegrained equigranular granite. Small to large mafic magmatic enclaves(MME) are distributed within the lower granite, while homogeneous grey-coloured hybrid rocks dominate the upper granite. From field relationships, textural features, and mineral chemical analyses we infer that the Kathalguri Pluton was a vertically zoned felsic magma chamber that was intruded by mafic magma during its evolution. The lower portion of the magma chamber was occupied by crystal mush, while the upper portion was dominated by melt when mafic magma intruded it. The occurrence of upper and lower zonations was probably brought about by fractional crystallization. The presence of such zonations within the felsic reservoir caused the mafic magma to interact with the two distinct zones differently,forming MME in the lower granite and homogeneous hybrid rocks in the upper portion. The plagioclase compositions of the larger MME, smaller MME, hybrid rocks,and granitic host rocks vary between An;–An;, An;–An;, An;–An;,and An;–An;respectively. The alkali feldspar compositions of the hybrid rocks range from Or;to Or;, while that of the host granite varies from Or;to Or;. The biotite is eastonitic and siderophyllitic in composition, while the pyroxene is diopside. The apparent pressure range of biotite crystallization in the granitic rocks was calculated at 1.93 to 2.28 kbar, while the biotite crystallization temperature for the different rock types is in the range of 628 and 759 ℃. Oxygen fugacity estimates from the biotite suggest that the Kathalguri magmas crystallized at fO;conditions above the nickel-nickel oxide(NNO) buffer. Distinct disequilibrium textures indicating mixing and mingling between the mafic and felsic magmas are

关键词： Mafic magmatic enclaves Hybrid rocks Orthoclase-microcline transformation Shillong Group Kathalguri pluton