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International Journal of Modeling, Simulation, and Scientific Computing 2013年第3期4卷 149-178页

作者： sarvesh kumar Department of Mathematics Indian Institute of Space Science and Technology Thiruvananthapuram 695547 KeralaIndia

The incompressible miscible displacement problem in porous media is modeled by a coupled system of two nonlinear partial differential equations,the pressure–velocity equation and the concentration *** this paper,we present a mixed finite volume element method(FVEM)for the approximation of the pressure–velocity equation and a standard FVEM for the concentration equation.A priori error estimates in L^(∞)(L^(2))are derived for velocity,pressure and *** results are presented to substantiate the validity of the theoretical results.

关键词： Mixed methods finite volume element methods miscible displacement problems error estimates numerical experiments.

A robust approach to identify roof bolts in 3D point cloud data captured from a mobile laser scanner

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International Journal of Mining Science and Technology 2021年第2期31卷 303-312页

作者： sarvesh kumar Singh Simit Raval Bikram Banerjee School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia Agriculture Victoria HorshamVIC 3400Australia

Roof bolts such as rock bolts and cable bolts provide structural support in underground *** assessment of these support structures is critical to maintain roof stability and minimise safety risks in underground *** study proposes a robust workflow to classify roof bolts in 3 D point cloud data and to generate maps of roof bolt density and *** workflow was evaluated for identifying roof bolts in an underground coal mine with suboptimal lighting and global navigation satellite system(GNSS)signals not *** approach is based on supervised classification using the multi-scale Canupo classifier coupled with a random sample consensus(RANSAC)shape detection algorithm to provide robust roof bolt *** issue of sparseness in point cloud data has been addressed through upsampling by using a moving least squares *** accuracy of roof bolt identification was measured by correct identification of roof bolts(true positives),unidentified roof bolts(false negatives),and falsely identified roof bolts(false positives)using correctness,completeness,and quality *** proposed workflow achieved correct identification of 89.27%of the roof bolts present in the test ***,considering the false positives and false negatives,the overall quality metric was reduced to 78.54%.

关键词： Mobile laser scanning Roof bolts Support system planning Roof monitoring Change detection Underground roadways

A review of laser scanning for geological and geotechnical applications in underground mining

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International Journal of Mining Science and Technology 2023年第2期33卷 133-154页

作者： sarvesh kumar Singh Bikram Pratap Banerjee Simit Raval School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia Agriculture Victoria Grains Innovation ParkHorshamVIC 3400Australia

Laser scanning can provide timely assessments of mine sites despite adverse challenges in the operational *** there are several published articles on laser scanning,there is a need to review them in the context of underground mining *** this end,a holistic review of laser scanning is presented including progress in 3D scanning systems,data capture/processing techniques and primary applications in underground *** scanning technology has advanced significantly in terms of mobility and mapping,but there are constraints in coherent and consistent data collection at certain mines due to feature deficiency,dynamics,and environmental influences such as dust and *** suggest that laser scanning has matured over the years for change detection,clearance measurements and structure mapping ***,there is scope for improvements in lithology identification,surface parameter measurements,logistic tracking and autonomous *** scanning has the potential to provide real-time solutions but the lack of infrastructure in underground mines for data transfer,geodetic networking and processing capacity remain limiting ***,laser scanners are becoming an integral part of mine automation thanks to their affordability,accuracy and mobility,which should support their widespread usage in years to come.

关键词： Mine automation Point cloud Rock mass characterisation Change detection Data registration Georeferencing

Spoil characterisation using UAV-based optical remote sensing in coal mine dumps

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International Journal of Coal Science & Technology 2023年第5期10卷 72-86页

作者： Sureka Thiruchittampalam sarvesh kumar Singh Bikram Pratap Banerjee Nancy F.Glenn Simit Raval School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia Agriculture Victoria Grains Innovation Park110 Natimuk RoadHorshamVIC 3400Australia Department of Geosciences Boise State UniversityBoiseIDUSA

The structural integrity of mine dumps is crucial for mining operations to avoid adverse impacts on the triple *** temporal assessments of coal mine dumps are a compliant requirement to ensure design reconciliation as spoil off-loading continues over ***,the conventional in-situ coal spoil characterisation is inefficient,laborious,hazardous,and prone to experts'observation *** this end,this study explores a novel approach to develop automated coal spoil characterisation using unmanned aerial vehicle(UAV)based optical remote *** textural and spectral properties of the high-resolution UAV images were utilised to derive lithology and geotechnical parameters(i.e.,fabric structure and relative density/consistency)in the proposed *** raw images were converted to an orthomosaic using structure from motion aided ***,structural descriptors were computed per pixel to enhance feature modalities of the spoil ***,machine learning algorithms were employed with ground truth from experts as training and testing data to characterise spoil rapidly with minimal human *** characterisation accuracies achieved from the proposed approach manifest a digital solution to address the limitations in the conventional characterisation approach.

关键词： Lithology Fabric structure Consistency/relative density Dimensionality reduction Supervised learning algorithms

An investigation of machine learning techniques to estimate minimum horizontal stress magnitude from borehole breakout

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International Journal of Mining Science and Technology 2022年第5期32卷 1021-1029页

作者： Huasheng Lin sarvesh kumar Singh Zizhuo Xiang Won Hee Kang Simit Raval Joung Oh Ismet Canbulat Glencore Coal Assets Australia Mount Thorley 2330Australia School of Minerals and Energy Resources Engineering University of New South WalesSydney 2052Australia Centre for Infrastructure Engineering School of EngineeringWestern Sydney UniversityPenrith 2751Australia

Borehole breakout is a widely utilised phenomenon in horizontal stress orientation determination,and breakout geometrical parameters,such as width and depth,have been used to estimate both horizontal stress ***,the accuracy of minimum horizontal stress estimation from borehole breakout remains relatively low in comparison to maximum horizontal stress *** paper aims to compare and improve the minimum horizontal stress estimation via a number of machine learning(ML)regression techniques,including parametric and non-parametric models,which have rarely been *** models were trained based on 79 laboratory data from published literature and validated against 23 field data.A systematic bias was observed in the prediction for the validation dataset whenever the horizontal stress value exceeded the maximum value in the training ***,the pattern was captured,and the removal of systematic bias showed that the artificial neural network is capable of predicting the minimum horizontal stress with an average error rate of 10.16%and a root mean square error of 3.87 MPa when compared to actual values obtained through conventional in-situ measurement *** is a meaningful improvement considering the importance of in-situ stress knowledge for underground operations and the availability of borehole breakout data.

关键词： Borehole breakout In-situ stress estimation Comparative analysis Machine learning

Optical Character Recognition for printed Tamil text using Unicode

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第11期6卷 1297-1305页

作者： SEETHALAKSHMI R. SREERANJANI T.R. BALACHANDAR T. Abnikant Singh Markandey Singh Ritwaj Ratan sarvesh kumar Shanmugha Arts Science Technology and Research Academy Thirumalaisamudram Thanjavur Tamil Nadu IndiaShanmugha Arts Science Technology and Research Academy Thirumalaisamudram Thanjavur Tamil Nadu IndiaShanmugha Arts Science Technology and Research Academy Thirumalaisamudram Thanjavur Tamil Nadu IndiaShanmugha Arts Science Technology and Research Academy Thirumalaisamudram Thanjavur Tamil Nadu IndiaShanmugha Arts Science Technology and Research Academy Thirumalaisamudram Thanjavur Tamil Nadu IndiaShanmugha Arts Science Technology and Research Academy Thirumalaisamudram Thanjavur Tamil Nadu IndiaShanmugha Arts Science Technology and Research Academy Thirumalaisamudram Thanjavur Tamil Nadu India

Optical Character Recognition (OCR) refers to the process of converting printed Tamil text documents into software translated Unicode Tamil Text. The printed documents available in the form of books, papers, magazines, etc. are scanned using standard scanners which produce an image of the scanned document. As part of the preprocessing phase the image file is checked for skewing. If the image is skewed, it is corrected by a simple rotation technique in the appropriate direction. Then the image is passed through a noise elimination phase and is binarized. The preprocessed image is segmented using an algorithm which de- composes the scanned text into paragraphs using special space detection technique and then the paragraphs into lines using vertical histograms, and lines into words using horizontal histograms, and words into character image glyphs using horizontal histograms. Each image glyph is comprised of 32×32 pixels. Thus a database of character image glyphs is created out of the segmentation phase. Then all the image glyphs are considered for recognition using Unicode mapping. Each image glyph is passed through various routines which extract the features of the glyph. The various features that are considered for classification are the character height, character width, the number of horizontal lines (long and short), the number of vertical lines (long and short), the hori- zontally oriented curves, the vertically oriented curves, the number of circles, number of slope lines, image centroid and special dots. The glyphs are now set ready for classification based on these features. The extracted features are passed to a Support Vector Machine (SVM) where the characters are classified by Supervised Learning Algorithm. These classes are mapped onto Unicode for recognition. Then the text is reconstructed using Unicode fonts.

关键词：光学性质识别支撑向量人工神经网络编码系统软件翻译

Factors Associated with Under-Five Mortality: A Comparison between Empowered Action Group (EAG) and Non-EAG States of India

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Health 2021年第11期13卷 1190-1205页

作者： sarvesh kumar Damodar Sahu Nishanka Chauhan USMPMHS Guru Gobind Singh Indraprastha University New Delhi India National Institute of Medical Statistics ICMR New Delhi India State Institute of Health and Family Welfare Jaipur India

Background: In India under-five mortality (U5MR) has declined by 71% from 126 to 37 deaths per 1000 live births between 1990 and 2018. The Empowered Action Group (EAG) states accounts for 74% of the under-five deaths as compared to 26% among Non-EAG states. Method: National Family Health Survey round fourth (NFHS-4), 2015-16 was used for this study. A life table method and Cox Proportional Hazard (PH) model was used to examine the various factors associated with U5MR in EAG and Non-EAG states of India. Result: Overall, it was observed that U5MR is much higher in EAG compared to Non-EAG states. Absolute difference varies according to background characteristics. The highest difference was among mothers who had never breastfed (316 vs 150 U5MR per 1000 live births in EAG & Non-EAG states respectively). Factors—total children ever born to mother, household members, children never breastfed and size of the baby were found to be statistically significantly associated with under-five mortality after controlling for other factors in both EAG and Non-EAG states. Hazard of U5MR was two and half-times higher among birth order 4+ (AHR = 2.5, 95% CI = 1.8 - 3.3) compared to birth order ≤2 after controlling for other factors in EAG states. The risk of under-five mortality was found three times higher among mother having up to primary or no education (AHR = 2.9, 95% CI = 1.4 - 5.9) compared to mother having higher education in non-EAG states. Conclusion: The study revealed that both groups of states need health program interventions focused on high risk mothers, TT immunization and promoting basic health services and breastfeeding practices for the reduction U5MR.

关键词： Cox PH EAG Non-EAG NFHS U5MR

A perspective review on the biosynthesis of plant-based secondary metabolites and their application as potent drugs

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BIOCELL 2024年第4期48卷 541-557页

作者： JHILAM PRAMANIK AKASH kumar sarvesh RUSTAGI MEHAK KATYAL SHEETAL THAKUR JUTISHNA BORA SUMIRA MALIK ANCHAL TREHAN NAYAN TALUKDAR PETR SLAMA Department of Food Technology ITM UniversityGwaliorIndia Department of Food Technology SRM UniversitySonipatIndia Department of Food Technology Uttaranchal UniversityDehradunIndia Department of Nutrition and Dietetics Manav Rachna International Institute of Research&Studies(MRIIRS)FaridabadIndia University Centre for Research and Development UIBTChandigarh UniversityMohaliIndia Amity institute of Biotechnology Amity UniversityJharkhandRanchiIndia Department of Biotechnology University Center for Research&Development(UCRD)Chandigarh UniversityMohaliPunjabIndia Department of Science Guru Nanak College of Pharmaceutical SciencesDehradunIndia Program of Biotechnology Faculty of ScienceAssam down town UniversityGuwahatiIndia Department of Animal Morphology Physiology and GeneticsMendel University in BrnoBrnoCzech Republic

Many phytochemicals and their derived metabolites produced by plants are extensively employed in commercial goods,pharmaceutical products as well as in the environmental and medicalﬁ***,these secondary metabolites obtained from plants are in low amounts,and it is difﬁcult to synthesize them at the industrial *** these challenges,they may be utilized for a variety of medicinal products that are either available in the market or are being researched and *** metabolites are complex compounds that exhibit ***,under controlled conditions with elicitors,desired secondary metabolites may be produced from plant cell *** review emphasizes the various aspects of secondary metabolites including their types,synthesis,and applications as medicinal *** article aims to promote the use of plant secondary metabolites in the management and treatment of various diseases.

关键词： Secondary metabolites Medicinal plant Synthesis Health benefits

Ayurveda perspective and global scenario of Wet cupping therapy-a comprehensive review

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TMR Non-Drug Therapy 2020年第3期3卷 146-157页

作者： Kshipra Rajoria sarvesh kumar Singh Sanjeev Sharma National Institute of Ayurveda Jorawar Singh GateJaipur Rajasthan 302004India

Wet cupping is a simple and minor procedure practiced in Ayurveda and various traditional medicine system *** Ayurveda wet cupping therapy is practiced under the scope of Raktamo Kshana(therapeutic bloodletting)which is adopted to remove vitiated Rakta(blood).The present work is aimed to explore the wet cupping therapy from Ayurveda perspective along with global *** this review,classical Ayurveda text and PubMed,Cochrane library,science direct,Google scholar and DHARA database were scrutinized for worldwide work on wet cupping *** Ayurveda science can utilize these researches in completing its lost knowledge and also provide integrative effort in re-validation and enrichment of WCT which are required at large for greater benefit of the *** method of WCT application,principles,indications,contraindications,complications and probable mode of action from Ayurveda perspective and global scenario were introduced and summarized.

关键词： Wet cupping Principles Indications Contraindications Complications Comprehensive review

Polyaxial strength criterion and closed-form solution for squeezing rock conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 507-515页

作者： Rupesh kumar Verma sarvesh Chandra Department of Civil Engineering Indian Institute of Technology KanpurKanpur208016India

In this paper,a nonlinear strength criterion is proposed using the average of intermediate(σ2)and minor(σ3)principal stresses in place of σ3 in Ramamurthy(1994)’s strength *** proposed criterion has the main advantages of negligible variation of strength parameters with confining stress and ability to link with conventional strength ***,a new closed-form solution based on the proposed criterion is derived and validated for Chhibro Khodri ***,analytical solutions including Singh’s elastoplastic theory,Scussel’s approach,and closed-form solutions based on conventional and modified Ramamurthy(2007)criteria are compared with the results of proposed *** is shown that the in situ squeezing pressure predictions made by the proposed approach are more ***,a parametric study of the present analytical solution is carried out,which displays explicit dependency of tunnel stability on internal support pressure and tunnel *** influence of tunnel geometry is observed to be dependent on the applied support pressure.

关键词： Intermediate principal stress Squeezing pressure Closed-form solution Polyaxial strength criterion