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Mill tailings based composites as paste backfill in mines of U-bearing dolomitic limestone ore

Journal of Rock Mechanics and Geotechnical Engineering 2018年第2期10卷 310-322页

作者： Sandeep Panchal Debasis Deb t.sreenivas Department of Mining Engineering Indian Institute of Technology Mineral Processing Division Bhabha Atomic Research Centre

this paper elaborates on the development of paste backfill using mill tailings generated during the processing of a uranium ore deposit hosted in dolomitic limestone. the tailings have been characterized in terms of the physical, chemical and mineralogical properties. time-dependent rheological behaviors and geotechnical properties of cemented paste backfill(CPB) are also determined. the studies show that the mill tailing has the potential to form paste and the CPB has adequate strength to provide support to mine pillars, roofs, and walls.

关键词： Mining engineering Uranium ore deposit tailings Cemented paste backfill(CPB) Rheology Compressive strength

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A new cache of Eoarchaean detrital zircons from the Singhbhum craton,eastern India and constraints on early Earth geodynamics

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Geoscience Frontiers 2019年第4期10卷 1359-1370页

作者： Bulusu sreenivas Sukanta Dey Y.J. Bhaskar Rao t. Vijaya Kumar E.V.S.S.K. Babu Ian S. Williams CSIR-National Geophysical Research Institute Hyderabad 500007India Department of Earth Sciences Indian Institute of Science Education and ResearchKolkata 741246India Research School of Earth Sciences The Australian National UniversityCanberra 2601Australia

the dominant geodynamic processes that underpin the formation and evolution of Earth’s early crust remain enigmatic calling for new information from less studied ancient cratonic ***,we present U-Pb ages and Hf isotopic compositions of detrital zircon grains from^2.9 Ga old quartzites and magmatic zircon from a 3.505 Ga old dacite from the Iron Ore Group of the Singhbhum craton,eastern *** detrital zircon grains range in age between 3.95 Ga and 2.91 *** with the recently reported Hadean,Eoarchean xenocrystic(up to 4.24 Ga)and modem detritus zircon grains from the Singhbhum craton,our results suggest that the Eoarchean detrital zircons represent crust generated by recycling of Hadean felsic crust formed at^4.3-4.2 Ga and^3.95 *** observe a prominent shift in Hf isotope compositions at^3.6-3.5 Ga towards super-chondritic values,which signify an increased role for depleted mantle and the relevance of plate *** Paleo-,Mesoarchean zircon Hf isotopic record in the craton indicates crust generation involving the role of both depleted and enriched mantle *** infer a short-lived suprasubduction setting around^3.6-3.5 Ga followed by mantle plume activity during the Paleo-,Mesoarchean crust formation in the Singhbhum *** Singhbhum craton provides an additional repository for Earth’s oldest materials.

关键词： U-Pb zircon ages Hf isotopes Singhbhum craton Hadean Eoarchean Geodynamics

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Accurate Fingerprint Enhancement and Identification Using Minutiae Extraction

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Journal of Computer and Communications 2017年第14期5卷 28-38页

作者： Kumar Attangudi Perichiappan Perichappan sreenivas Sasubilli Regional Development Center KPMG Roseland NJ USA

Fingerprints are an extraordinary source for recognizable proof of people. Unique finger impression acknowledgment is one of the most seasoned types of biometric identification. However, getting a decent unique finger impression picture isn’t that simple. So we must process unique finger impression picture before coordinating. A crucial advance in measurements of fingerprint minutiae is to obtain minutiae from the finger impression pictures dependably. However, fingerprint images are occasionally of perfect quality. they might be debased and defiled because of varieties in skin and impression conditions. Along these lines, image enhancement strategies utilize other details extraction to acquire a more reliable estimation of minutiae areas. the primary objective of this research work is to introduce a superior and improved unique fingerprint image. We studied the elements identifying with getting elite component focuses detection algorithm, for example, picture quality, segmentation, picture upgrade and highlight recognition. Usually utilized features for enhancing unique finger impression picture quality are Fourier spectrum energy, Sobel filter energy, and local orientation. Precise segmentation of unique finger impression edges from a broad foundation is vital. For productive improvement and feature extraction algorithms, we zero the commotion in segmented features. As a pre-processing method, we need to perform comprising of field introduction, ridge frequency estimation, Sobel filtering, division. then connect the resulting picture to a thinning algorithm and consequent minutiae extraction. After resultant extraction of these minutiae focuses, we will utilize the picture with focuses for coordinating or finding the offenders and also for other security issues. the procedure of image pre-processing and minutiae extraction is explored. the simulations are performed in the MAtLAB environment to assess the execution of the implemented algorithm.

关键词： AFAS (Automatic Fingerprint Authentication System) Fingerprint Image Pre-Processing Minutiae Extraction Fingerprint Ridge thinning Minutiae

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Regulatory t Cells In A Spectrum Of HPV Induced Cervical Lesions:Cervicitis,Cervical Intraepithelial Neoplasia Ⅲ,And Squamous Cell Invasive Cervical Cancer

Regulatory T Cells In A Spectrum Of HPV Induced Cervical Les...

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24th International Papillomavirus Conference and Clinical Workshop

作者： sreenivas Adurthi Sudhir Krishna Geetashree Mukherjee Bafna UD Uma Devi Jayshree RS Kidwai Memorial Institute of Oncology National Centre for Biological Sciences Kidwai Memorial Institute of Oncology Kidwai Memorial Institute of Oncology Kidwai Memorial Institute of Oncology Kidwai Memorial Institute of Oncology

＜正＞Problem:Regulatory t cells（tregs）play a rote in immune tolerance to tumors Insitu immune profiling of hpv induced cervical lesions was done with reference to tregs. Methods:Infiltrates in hpv positive cervicit...

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