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State of the art in finite element approaches for milling process:a review

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Advances in Manufacturing 2023年第4期11卷 708-751页

作者： Shailendra chauhan Rajeev Trehan Ravi Pratap Singh Department of Industrial and Production Engineering Dr.B R Ambedkar National Institute of TechnologyJalandharPunjabIndia

Over a century,metal cutting has been observed as a vital process in the domain of *** the numerous available metal-cutting processes,milling has been considered as one of the most employable processes to machine a variety of engineering materials *** the milling process,material removal occurs when the workpiece is fed against a rotating tool with multiple cutting *** order to maximize the profitability of metal cutting operations,it is essential that the various input and output variable relationships are analyzed and *** experimental method of studying milling processes is costly and time demanding,particularly when a large variety of elements such as cutting tool shape,materials,cutting conditions,and so on,are *** to these issues,other alternatives emerged in the form of mathematical simulations that employ numerical *** finite element approaches have well-proven to be the most practical and commonly utilized numerical *** finite element model(FEM)can be used to determine the various physical interactions occurring during the machining process along with the prediction of various milling characteristics,such as cutting forces,cutting temperature,stresses,etc.,with the help of milling *** the present article,various research studies in the broad milling process domain practiced with numerous finite element approaches have been critically reviewed and *** further highlights the several experimental and finite element approaches-based research studies that attempted to analyze and optimize the overall performance of the different milling *** recent years,various investigators have explored numerous ways to enhance milling performance by probing the different factors that influence the quality *** of the studies have also been found to be focused on the economic impacts of milling and various process inputs that affect milling ***,various milli

关键词： Milling Finite element modeling(FEM) Micro milling Turn-milling

Synthesis,characterization and photoluminescent properties of Eu(Ⅲ)complexes with 5-hydroxy-2-hydroxymethyl-4H-4-pyranone and N,N’-donor heterocyclic coligands

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Rare Metals 2021年第5期40卷 1118-1125页

作者： Shammy Laj Dhania Archana chauhan Ritu Langyan Department of Chemistry Kurukshetra UniversityKurukshetra 136119India

In present work,five novel europium complexes[Eu(L)3·Phen(2),Eu(L)3·Bipy(3),Eu(L)3·Neo(4),Eu(L)3·Biq(5)and Eu(L)3·Batho(6)]were synthesized,derived from[Eu(L)3·2 H_(2)O](1)complex by using ligand(HL)5-hydroxy-2-(hydroxymethyl)-4 H-pyran-4-one and coligands 1,10-phenanthroline,bipyridine,neocuproine,2,2’-biquinoline and *** order to seek excellent photoluminescent properties,coligands were introduced in the complexes to form a rigid conjugated system,thus enhancing luminescence properties of *** synthesized complexes reveal four narrow characteristic emission lines of Eu(III)consistent with ^(5)D0→^(7)FJ transitions,where J=0,1,2 and 3 at about 580,595,614 and 650 nm,*** ^(5)D0→^(7)F_(2) transition is responsible for strong red *** coordinate diagram also indicates that x,y coordinates lie in deep red *** data are in favour of high thermal stability of synthesized *** to their high thermal stability and strong red luminescence,these complexes might be used in fabrication of optoelectronic devices.

关键词： Photoluminescence Europium complexes Color coordinates Optoelectronic devices Thermal stability

Feasibility of Grid-connected Solar-wind Hybrid System with Electric Vehicle Charging Station

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 295-306页

作者： Shakti Singh Prachi chauhan Nirbhow Jap Singh the Department of Electrical and Instrumentation Engineering Thapar Institute of Engineering and TechnologyPatialaIndia

Recently,renewable power generation and electric vehicles(EVs)have been attracting more and more attention in smart *** paper presents a grid-connected solar-wind hybrid system to supply the electrical load demand of a small shopping complex located in a university campus in ***,an EV charging station is incorporated in the *** analysis is performed for the proposed setup to satisfy the charging demand of EVs as well as the electrical load demand of the shopping *** proposed system is designed by considering the cost of the purchased energy,which is sold to the utility grid,while the power exchange is ensured between the utility grid and other components of the *** sizing of the component is performed to obtain the least levelized cost of electricity(LCOE)while minimizing the loss of power supply probability(LPSP)by using recent optimization *** results demonstrate that the LCOE and LPSP for the proposed system are measured at 0.038$/k Wh and0.19%with a renewable fraction of 0.87,*** is determined that a cost-effective and reliable system can be designed by the proper management of renewable power generation and load *** proposed system may be helpful in reducing the reliance on the over-burdened grid,particularly in developing countries.

关键词： Charging station electric vehicle(EV) optimization solar photovoltaic(SPV)panels wind turbine

Longitudinal growth strains in five clones of Eucalyptus tereticornis Sm

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Journal of Forestry Research 2013年第2期24卷 339-343页

作者： Pankaj Aggarwal Shakti chauhan Institute of Wood Science and Technology

We studied the variability in longitudinal growth strains and wood basic density in five-year old trees from five clones （one tree per clone） of Eucalyptus tereticornis. Mean longitudinal growth strain in clones ranged from 466 to 876 μm. There was a significant difference between clones in growth strains and wood basic density. Clone 10 exhibited maximum growth strains and basic density, whereas clone 3 and clone 7 exhibited minimum growth strains and basic density, respectively. Within a tree, the growth strain variation with tree height was high but statistically insignificant while within tree variation in basic density was very small. There was no specific trend in variation in either strain or density within a tree. There was 5% 200% difference in growth strain on opposite sides of the logs. However two strains showed a strong positive correlation. There was a moderate positive association of wood basic density and mean growth strains in logs. The variation around the periphery emphasize the need to measure strain more than one, preferably on opposite sides at the same height, on a tree to know the mean strain level for the purpose of selection of clones.

关键词： basic density clone eucalypts growth stress strain gauge

Bystanders or not?Microglia and lymphocytes in aging and stroke

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Neural Regeneration Research 2023年第7期18卷 1397-1403页

作者： Justin N.Nguyen Anjali chauhan University of Texas McGovern Medical School at Houston HoustonTXUSA Department of Neurology University of Texas McGovern Medical School at HoustonHoustonTXUSA

As the average age of the world population increases,more people will face debilitating aging-associated conditions,including dementia and *** only does the incidence of these conditions increase with age,but the recovery afterward is often worse in older *** and health professionals must unveil and understand the factors behind age-associated diseases to develop a therapy for older *** causes profound changes in the immune system including the activation of microglia in the *** microglia promote T lymphocyte transmigration leading to an increase in neuroinflammation,white matter damage,and cognitive impairment in both older humans and *** presence of T and B lymphocytes is observed in the aged brain and correlates with worse stroke *** strategies in stroke target either microglia or the lymphocytes or the communications between them to promote functional recovery in aged *** this review,we examine the role of the microglia and T and B lymphocytes in aging and how they contribute to cognitive ***,we provide an important update on the contribution of these cells and their interactions in preclinical aged stroke.

关键词： age B lymphocytes brain central nervous system cognition inflammation microglia middle cerebral artery occlusion neuroinflammation stroke T lymphocytes white matter injury

Nanodiamonds with powerful ability for drug delivery and biomedical applications:Recent updates on in vivo study and patents

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Journal of Pharmaceutical Analysis 2020年第1期10卷 1-12页

作者： Swati chauhan Neha Jain Upendra Nagaich Department of Pharmaceutics Amity Institute of PharmacyAmity UniversityNoidaU.P.India

Nanodiamonds are novel nanosized carbon building blocks possessing varied fascinating mechanical,chemical,optical and biological properties,making them significant active moiety carriers for biomedical *** are known as the most‘captivating’crystals attributed to their chemical inertness and unique properties posing them useful for variety of applications in biomedical ***,it becomes increasingly important to find,ascertain and circumvent the negative aspects associated with *** modification or functionalization with biological molecules plays a significant role in managing the toxic behavior since nanodiamonds have tailorable surface *** take advantage of nanodiamond potential in drug delivery,focus has to be laid on its purity,surface chemistry and other considerations which may directly or indirectly affect drug adsorption on nanodiamond and drug release in biological *** review emphasizes on the basic properties,synthesis techniques,surface modification techniques,toxicity issues and biomedical applications of *** the development of nanodiamonds as an effective dosage form,researchers are still engaged in the in-depth study of nanodiamonds and their effect on life interfaces.

关键词： Nanomedicine Biochemical application Diamondoids Surface functionalization Drug targeting

Sarve:synthetic data and local differential privacy for private frequency estimation

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Cybersecurity 2022年第4期5卷 97-116页

作者： Gatha Varmal Ritu chauhan Dhananjay Singh Amity Institute of Information Technology Amity UniversityNoidaIndia Center for Computational Biology and Bioinformatics Amity UniversityNoidaIndia Department of Electronics Engineering HUFSSeoulKorea

The collection of user attributes by service providers is a double-edged *** are instrumental in driving statistical analysis to train more accurate predictive models like *** analysis of the collected user data includes frequency estimation for categorical ***,the users deserve privacy guarantees against inadvertent identity *** algorithms called frequency oracles were developed to randomize or perturb user attributes and estimate the frequencies of their *** propose Sarve,a frequency oracle that used Randomized Aggregatable Privacy-Preserving Ordinal Response(RAPPOR)and Hadamard Response(HR)for randomization in combination with fake *** design of a service-oriented architecture must consider two types of complexities,namely computational and *** functions of such systems aim to minimize the two complexities and therefore,the choice of privacy-enhancing methods must be a calculated *** variant of RAPPOR we had used was realized through bloom flters.A bloom filter is a memory-efficient data structure that offers time complexity of O(1).On the other hand,HR has been proven to give the best communication costs of the order of log(b)for b-bits ***,Sarve is a step towards frequency oracles that exhibit how privacy provisions of existing methods can be combined with those of fake data to achieve statistical results comparable to the original *** also implemented an adaptive solution enhanced from the work of Arcolezi et *** use of RAPPOR was found to provide better privacy-utility tradeoffs for specific privacy budgets in both high and general privacyregimes.

关键词： Synthetic data Differential privacy Frequency estimation Frequency oracle Privacy

Gompertz PSO variants for Knapsack and Multi-Knapsack Problems

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Applied Mathematics(A Journal of Chinese Universities) 2021年第4期36卷 611-630页

作者： Pinkey chauhan Millie Pant Kusum Deep Department of Mathematics Jaypee Institute of Information TechnologyNoida 201304India

Particle Swarm Optimization,a potential swarm intelligence heuristic,has been recognized as a global optimizer for solving various continuous as well as discrete optimization *** by the performance of Gompertz PSO on a set of continuous problems,this works extends the application of Gompertz PSO for solving binary optimization ***,a new chaotic variant of Gompertz PSO namely Chaotic Gompertz Binary Particle Swarm Optimization(CGBPSO)has also been *** new variant is further analysed for solving binary optimization *** new chaotic variant embeds the notion of chaos into GBPSO in later stages of searching process to avoid stagnation *** efficiency of both the Binary PSO variants has been tested on different sets of Knapsack Problems(KPs):0-1 Knapsack Problem(0-1 KP)and Multidimensional Knapsack Problems(MKP).The concluding remarks have made on the basis of detailed analysis of results,which comprises the comparison of results for Knapsack and Multidimensional Knapsack problems obtained using BPSO,GBPSO and CGBPSO.

关键词： Binary PSO Knapsack Problems Multi Knapsack Problems Gompertz function chaos

Magnesium based implants for functional bone tissue regeneration–A review

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Journal of Magnesium and Alloys 2022年第2期10卷 384-419页

作者： Gavish Uppal Amit Thakur Amit chauhan Saroj Bala University Institute of Engineering and Technology Panjab Universitysector-14ChandigarhIndia Sri Guru Gobind Singh College Panjab Universitysector-26ChandigarhIndia

Magnesium(Mg)has emerged as one of the third-generation biomaterials for regeneration and support of functional bone *** is a better choice over permanent implants such as titanium,stainless steel,cobalt-chrome as magnesium is biodegradable and does not require a second surgery for its removal after bone tissue *** also reduces the risk of stress shielding as its elastic modulus is closer to human bone in comparison to permanent implants and other biodegradable metallic implants based on Iron and *** importantly,Mg is osteoconductive thus stimulates new bone formation and possess anti-bacterial properties hence reducing the risk of failure due to *** its advantages,a major concern with pure Mg is its rapid bio-corrosion in presence of body fluids due to which the mechanical integrity of the implant deteriorates before healing of the tissue is *** properties of Mg-based implants can be enhanced by mechanical processing,alloying,and topology *** reduce the corrosion/degradation rate,Mg has been alloyed with metals,reinforced with ceramics,and surface coatings have been applied so that the degradation rate of Mg-based implant matches with that of healing rate of bone *** present review discusses the effect of alloying elements and reinforcing ceramics on microstructure,mechanical,and corrosion properties of Mg-based orthopedic *** addition,the biocompatibility of Mg-based alloys,composites,and coatings applied on Mg implants has been ***,different methods of fabricating porous implants have been highlighted as making the implant porous facilitates the growth of new bone tissue through the pores.

关键词： Magnesium Biodegradable orthopedic implant Porous structure Osteo-conductive Antibacterial