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A comprehensive investigation on nonlinear vibration and bending characteristics of bio-inspired helicoidal laminated composite structures

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： S.SAURABH R.kiran D.SINGH R.VAISH V.S.CHAUHAN School of Mechanical and Materials Engineering Indian Institute of Technology Mandi

Bio-inspired helicoidal composite laminates, inspired by the intricate helical structures found in nature, present a promising frontier for enhancing the mechanical properties of structural designs. Hence, this study provides a comprehensive investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates. The inverse hyperbolic shear deformation theory(IHSDT) of plates is employed to characterize the displacement field, with the incorporation of Green-Lagrange nonlinearity. The problem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB environment to solve it numerically. Various helicoidal layup configurations including helicoidal recursive(HR), helicoidal exponential(HE), helicoidal semi-circular(HS), linear helicoidal(LH), and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied. The model is validated, and parametric studies are conducted. These studies investigate the effects of layup configurations, side-to-thickness ratio, modulus ratios, boundary conditions, and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates. The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

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Ultra‑Transparent and Multifunctional IZVO Mesh Electrodes for Next‑Generation Flexible Optoelectronics

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Nano-Micro Letters 2025年第1期17卷 293-309页

作者： kiran A.Nirmal Tukaram D.Dongale Atul C.Khot Chenjie Yao Nahyun Kim Tae Geun Kim School of Electrical Engineering Korea UniversityAnam‑ro 145Seongbuk‑guSeoulRepublic of Korea Computational Electronics and Nanoscience Research Laboratory School of Nanoscience and BiotechnologyShivaji UniversityKolhapur 416004India

Mechanically durable transparent electrodes are essential for achieving long-term stability in flexible optoelectronic ***,they are crucial for applications in the fields of energy,display,healthcare,and soft *** meshes represent a promising alternative to traditional,brittle,metal oxide conductors due to their high electrical conductivity,optical transparency,and enhanced mechanical *** this paper,we present a simple method for fabricating an ultra-transparent conducting metal oxide mesh electrode using selfcracking-assisted *** this method,we produced an electrode with ultra-transparency(97.39%),high conductance(Rs=21.24Ωsq^(−1)),elevated work function(5.16 eV),and good mechanical *** also evaluated the effectiveness of the fabricated electrodes by integrating them into organic photovoltaics,organic light-emitting diodes,and flexible transparent memristor devices for neuromorphic computing,resulting in exceptional device *** addition,the unique porous structure of the vanadium-doped indium zinc oxide mesh electrodes provided excellent flexibility,rendering them a promising option for application in flexible optoelectronics.

关键词： Self-cracking template Vanadium-doped indium zinc oxide mesh Organic solar cells Organic light-emitting diodes Flexible transparent memory

Compression Molded Ultra High Molecular Weight Polyethylene-Hydroxyapatite-Aluminum Oxide-Carbon Nanotube Hybrid Composites for Hard Tissue Replacement

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Journal of Materials Science & Technology 2013年第6期29卷 514-522页

作者： Ankur Gupta Garima Tripathi Debrupa Lahiri Kantesh balani Department of Materials Science and Engineering Indian Institute of Technology KanpurKanpur 208016India Department of Mechanical and Materials Engineering.Florida International University MiamiFL 33174USA

Ultra high molecular weight polyethylene （UHMWPE） is widely used for articulating surfaces in total hip and knee replacements. In the present work, UHMWPE based polymer composites were synthesized by synergistic reinforcing of bioactive hydroxyapatite （HA）, bioinert aluminum oxide （Al2O3）, and carbon nanotubes （CNTs） using compression molding. Phase and microstructural analysis suggests retention of UHMWPE and reinforcing phases in the compression molded composites. Microstructural analysis elicited variation in densification due to the size effect of the reinforcing particles. The hybrid composites exhibited hardness, elastic modulus and toughness comparable to that of UHMWPE. The interfacial effect of reinforcement phases has evinced the effectiveness of Al2O3 over HA and CNT reinforcements, depicting synergistic enhancement in hardness and elastic modulus. Weak interfacial bonding of polymer matrix with HA and CNT requires utilization of coupling agents to achieve enhanced mechanical properties without deteriorating cytocompatible properties.

关键词： Compression molding Ultra high molecular weight polyethylene (UHMWPE) Hydroxyapatite Aluminum oxide (AI2O3) Carbon nanotubes (CNTs) Nanoindcntation

Mechanical, tribological and anti-corrosive properties of polyaniline/graphene coated Mg-9Li-7Al-1Sn and Mg-9Li-5Al-3Sn-1Zn alloys

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Journal of Materials Science & Technology 2019年第8期35卷 1767-1778页

作者： Rita Maurya Abdul Rahim Siddiqui Prvan Kumar Katiyar Kantesh balani Materials Science and Engineering Indian Institute of Technology Kanpur Kanpur 208016 India Centre for Material Science & Engineering National Institute of Technology Hamirpur Hamirpur 177005 India China-Canada Institute for Advanced Surface & Interface Science and Engineering Jiangsu University of Technology Changzhou 213001 China

The mechanical,tribological and corrosion protection offered to Mg-9Li-7Al-1Sn and Mg-9Li-5Al-3Sn-1Zn alloys by the epoxy coating containing polyaniline/graphene(PANI/Gr)pigments is undertaken in the current ***/Gr containing coatings were observed to be strongly adherent with a higher scratch hardness(Hs)and plowing hardness(Hp),*** 0.43 GPa,and Hpof 0.61 GPa,respectively when compared to that of neat epoxy coating(Hsof 0.17 GPa,and Hpof 0.40 GPa,respectively).Due to their higher Hsand Hpvalues,PANI/Gr based coatings displayed an enhanced wear resistance(Wear volume,Wv=4.53×10^-3 m^3)than that of neat epoxy coating(Wv=5.15×10^-3 m^3).The corrosion protection efficiency in corrosive environment of 3.5 wt%NaCl solution was obtained to be>99% for PANI/Gr containing coatings when compared to that of neat epoxy *** charge-transfer resistance(R(ct))of the PANI/Gr containing coatings were estimated to be>10^6 cm^2,which indicates their highly protective nature when compared to that of neat epoxy coating(R(ct)10^5 Ω cm^2).Hence,PANI/Gr containing coatings can be potentially used for wear resistance and corrosion protection applications in marine environments.

关键词： Mg-Li alloys Scratch hardness Plowing hardness Wear resistance Corrosion protection efficiency Charge transfer resistance

Effect of Alumina Dispersion on Microstructural and Nanomechanical Properties of Pulse Electrodeposited Nickel-Alumina Composite Coatings

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Journal of Materials Science & Technology 2014年第8期30卷 808-813页

作者： Ankur Gupta Swetha Barkam Debrupa Lahiri R.Balasubramaniam Kantesh balani Department of Materials Science & Engineering Indian Institute of TechnologyKanpur 208016India Department of Metallurgical and Materials Engineering Indian Institute of TechnologyRoorkee 247667India

Nickel-gamma alumina（Ni—γAI2O3） composite coatings were synthesized by pulsed electrodeposition technique with different concentrations of alumina（0,10,20 and 50 g/L） in Watt’s *** ultrasonic vibration and magnetic-stirring were utilized to disperse Al2O3 and to achieve its optimum *** shows that agglomerates occur at higher loadings,but 10 g/L Al2O3 addition in bath has shown uniform dispersion of alumina with improved mechanical properties such as hardness,Young’s modulus and yield strength by 40%,46%and 35%,respectively,when compared to that of pure Ni ***,elasto-plastic indentation mechanics has shown that strength at 29%strain is enhanced to 110.5 GPa for 10 g/L Al2O3electrophoretically deposited Ni—yAI2O3 coating when compared to that of electrodeposited Ni（81.8 GPa）.

关键词： Coating Electrodeposition Ni Alumina(Al2O3) Nanoindentation Deformation mechanism

Does deep sedation impact the results of 48 hours catheterless pH testing?

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World Journal of Gastroenterology 2011年第10期17卷 1304-1307页

作者： Vineet Korrapati Jay P Babich Anil balani James H Grendell, Kavita R Kongara Anil balani James H Grendell Kavita R Kongara Department of Gastroenterology and Hepatology Win-throp University Hospital Mineola NY 11501 United States Department of Gastroenterology and Hepatology UMDNJ-RWJ Medical School New Brunswick NJ 08901United States

AIM： To study a cohort of patients undergoing 48 h Bravo pH testing receiving deep sedation with propofol. METHODS： We retrospectively reviewed the charts of 197 patients （81 male, 116 female） who underwent Bravo esophageal pH monitoring from July 2003 to January 2008. All patients underwent Bravo pH probe placement via esophagogastroduodenoscopy （EGD） and received propofol for sedation. Patients on a proton pump inhibitor （89 patients） were excluded. Acid reflux variables measured included the total, upright, and supine fractions of time at pH 〈 4 and DeMeester score, and were compared between day I and day 2. RESULTS： Of the 108 patients that were included in the study, the most common indication for Bravo pH monitoring was heartburn, with chest pain being the second most common. A signed rank test revealed no statistically significant difference between day I and day 2 reflux episodes. CONCLUSION： Patients who received propofol for sedation for EGD with Bravo pH capsule placement did not experience any significant difference in reflux episodes from day 1 to day 2.

关键词： Esophagus Bravo study Propofol pH cap-sule Gastroesophageal reflux disease

Throughflow and g-jitter effects on binary fluid saturated porous medium

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Applied Mathematics and Mechanics(English Edition) 2015年第10期36卷 1285-1304页

作者： P.kiran Department of Applied Mathematics School for Physical Sciences Babasaheb Bhimrao Ambedkar University

A non-autonomous complex Ginzburg-Landau equation （CGLE） for the finite amplitude of convection is derived, and a method is presented here to determine the amplitude of this convection with a weakly nonlinear thermal instability for an oscillatory mode under throughflow and gravity modulation. Only infinitesimal disturbances are considered. The disturbances in velocity, temperature, and solutal fields are treated by a perturbation expansion in powers of the amplitude of the applied gravity field. Throughfiow can stabilize or destabilize the system for stress free and isothermal boundary conditions. The Nusselt and Sherwood numbers are obtained numerically to present the results of heat and mass transfer. It is found that throughfiow and gravity modulation can be used alternately to heat and mass transfer. Further, oscillatory flow, rather than stationary flow, enhances heat and mass transfer.

关键词： weakly nonlinear theory throughflow complex Ginzburg-Landau equation(CGLE) gravity modulation

Effectiveness of sloping agricultural land technology on soil fertility status of mid-hills in Nepal

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Journal of Forestry Research 2013年第4期24卷 767-775页

作者： kiran Lamichhane Institute of Applied Sciences Department of Environmental ScienceUniversity of North Texas

Hedgerows with intercropping systems were established at the ICIMOD test and demonstration site at Godawari to assess the effective- ness of Sloping Agricultural Land Technology （SALT） in reducing run- off water volume, controlling soil loss, increasing crop production, and improving soil fertility in the mid-hills of Nepal. Runoff water volume （1996-2002）, soil loss （1996-2002） and maize yield （1995-2001）, and soil fertility-related parameters were assessed on SALT models with three factors： the type of nitrogen-fixing plant, the farmers＇ practice, and fertilizer use. Results showed a significant effect of Alnus nepalensis and/or Indigofera dosua on runoff water volume, soil loss, crop produc- tion, soil water retention, and soil nutrients （NPK）. Farmers＇ practice and fertilization did not play a significant role in reducing runoff water and soil loss. However, farmers＇ practice significantly increased crop produc- tion. Therefore, integrating soil conservation approaches on SALT sys- tems enhances stable economic output to hills and mountain farmers.

关键词： Sloping Agricultural Land Technology hedgerows agroforestry mountain fanning system soil erosion soil nutrient

Arraying of microphotosynthetic power cells for enhanced power output

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Microsystems & Nanoengineering 2022年第2期8卷 185-202页

作者： kiran Kuruvinashetti Muthukumaran Packirisamy Optical-Bio Microsystems Laboratory Department of MechanicalIndustrial and Aerospace EngineeringConcordia UniversityMontrealQC H3G1M8Canada

Microphotosynthetic power cells(μPSCs)generate power through the exploitation of living photosynthetic’microorganisms by harvesting *** thermodynamic limitations of this process restrict the power output of a single ***,we demonstrateμPSCs in four different array configurations to enhance power output from these power *** this effect,sixμPSCs were arrayed in series,parallel,and combinations of series and parallel *** pPSC was injected with a 2 mL liquid culture of photosynthetic microorganisms(Chlamydomonas reinhardtii)in the anode and 2 mL of 25%(w/v)electron acceptor potassium ferricyanide(K_(3)Fe(CN)_(6))in the *** combinations ofμPSCs connected in series and parallel'generated higher power than the individual series and parallel *** combinations of sixμPSCs connected in series and in parallel produced a high power density of 1914 mWm^(-2)in the presence of white fluorescent light illumination at 20μEm^(-2)s^(-1).Furthermore,to realize the array strategy for real-time applications,a 1.7V/2mA rating light-emitting diode(LED)was powered by combinations of series and parallel array *** results indicate the reliability ofμPSCs to produce electricity from photosynthetic microorganisms for low-power *** addition,the results suggest that a combination of microlevel photosynthetic cells in array format represents a powerful optimal design strategy to enhance the power output fromμPSCs.

关键词： power illumination harvesting