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Actively tunable electromagnetically induced transparency in hybrid Dirac-VO2 metamaterials

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Optoelectronics Letters 2025年第1期21卷 13-20页

作者： DI Ke XIE Meng XIA Huarong CHENG Anyu LIU Yu DU Jiajia department of Optoelectronic Engineering Chongqing University of Post and Telecommunications Chongqing Key Laboratory of Autonomous Navigation and Microsystem Chongqing University of Posts and Telecommunications department of Automation Chongqing University of Post and Telecommunications

In this paper, we present a metamaterial structure of Dirac and vanadium dioxide（VO2） and investigate its optical properties using the finite-difference time-domain（FDTD） technique. Using the phase transition feature of VO2, the design can realize active tuning of the plasmon induced transparency（PIT） effect at terahertz frequency, thereby converting from a single PIT to a double-PIT. When VO2is in the insulating state, the structure is symmetric to obtain a single-band PIT effect. When VO2is in the metallic state, the structure turns asymmetric to realize a dual-band PIT effect. This design provides a reference direction for the design of actively tunable metamaterials. Additionally, it is discovered that the transparent window's resonant frequency and the Fermi level in this structure have a somewhat linear relationship. In addition, the structure achieves superior refractive index sensitivity in the terahertz band, surpassing 1 THz/RIU. Consequently, the design exhibits encouraging potential for application in refractive index sensors and optical switches.

关键词： Transparency

An SPH Framework for Earthquake-Induced Liquefaction Hazard Assessment of Geotechnical Structures

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 251-277页

作者： Sourabh Mhaski G.V.Ramana department of Civil Engineering Indian Institute of Technology DelhiNew Delhi110016India

Earthquake-induced soil liquefaction poses significant risks to the stability of geotechnical structures *** understanding of the liquefaction triggering,and the post-failure large deformation behaviour is essential for designing resilient *** present study develops a Smoothed Particle Hydrodynamics(SPH)framework for earthquake-induced liquefaction hazard assessment of geotechnical *** coupled flowdeformation behaviour of soils subjected to cyclic loading is described using the PM4Sand model implemented in a three-phase,single-layer SPH framework.A staggered discretisation scheme based on the stress particle SPH approach is adopted to minimise numerical inaccuracies caused by zero-energy modes and tensile ***,non-reflecting boundary conditions for seismic analysis of semi-infinite soil domains using the SPH method are *** numerical framework is employed for the analysis of cyclic direct simple shear test,seismic analysis of a level ground site,and liquefaction-induced failure of the Lower San Fernando *** agreement for liquefaction triggering and post-failure behaviour demonstrates that the SPH framework can be utilised to assess the effect of seismic loading on field-scale geotechnical *** present study also serves as the basis for future advancements of the SPH method for applications related to earthquake geotechnical engineering.

关键词： Earthquake seismic liquefaction stress particle PM4Sand smoothed particle hydrodynamics(SPH)

Variation in physico-chemical, organoleptic and microbial qualities of intermediate moisture pineapple (Ananas comosus (L.) Merr.) slices during storage

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Food Production, Processing and Nutrition 2022年第1期4卷 58-68页

作者： Saji Gomez Bintu Kuruvila P.K.Maneesha Meagle Joseph department of post harvest technology College of AgricultureKerala Agricultural UniversityVellanikkaraThrissur680656India

Pineapple is a commercial tropical fruit ranking sixth in global fruit production. Seasonal market gluts result in huge postharvest losses in all pineapple-growing nations. To reduce postharvest losses of fruits, viable, cost-effective and market-oriented value-added products are needed urgently. The present study was carried out to determine the suitability of two commercial varieties, Kew and Mauritius, for the development of intermediate moisture (IM) fruits and to evaluate product quality during storage. Pineapple slices were steam blanched for 2 min, followed by immersion in osmotic solution containing sucrose and sorbitol (fruit: solution ratio of 1:4), in combination with 0.5% ascorbic acid and 0.25% potassium metabisulfite, for 6 h and were subsequently dehydrated in a tray drier at 50 °C until the moisture content of the product attained equilibrium. The initial moisture contents of IM Kew and Mauritius pineapple slices were 26.53 and 21.65 g/100 g, respectively, while the water activity ranged between 0.671 and 0.666. The L* and b* values showed a decreasing trend, while a* value increased throughout storage, irrespective of variety and storage conditions. The initial TSS of IM pineapple from both varieties was 72 0 Brix, which declined during storage. Though titratable acidity of the product decreased during storage, the decline was insignificant. The total carotenoids of the product from Mauritius was significantly higher (0.809 mg 100 g− 1) compared to the one from Kew (0.215 mg 100 g− 1). Total phenolics contents in IM slices showed an increasing trend during storage, irrespective of varieties and storage conditions. IM pineapple slices from the variety Mauritius had significantly higher flavonoids (40.50 mg) than the product from Kew (30.0 mg 100 g− 1). DPPH radical scavenging activity was highest (3.0 μl ml− 1) in IM slices from the variety Mauritius as compared to those from Kew (5.0 μl ml− 1). IM pineapple from Mauritius recorded higher organolepti

关键词： Intermediate moisture(IM) Pineapple Physico-chemical Organoleptic Microbial

Optimization of substrate ratio for beer production from finger millet and barley

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International Journal of Agricultural and Biological Engineering 2015年第2期8卷 110-120页

作者： Sanjay Kumar Anupama Singh Navin Chandra Shahi Khan Chand Kopal Gupta department of post-harvest Process&Food Engineering College of TechnologyG.B.Pant University of Agriculture and TechnologyPantnagar 263145Udham Singh NagarUttarakhandIndia

Seventeen designed experiments were conducted in three steps(malting,brewing and fermentation)to produce beer from barley,finger millet and the combination of *** of independent variables with three levels for each *** ratios of grains(100:0,50:50,0:100),kilning temperature(50℃,70℃,90℃)and malted grain to water ratios(1:3,1:5,1:7)were investigated on product *** results of the study indicated that all the independent parameters *** ratio,kilning temperature and slurry ratio affected the responses(pH,colour,bitterness and alcohol content)*** values of parameters,from the simultaneous optimization done using Design Expert 8.***.6.1 software,for beer production,were found to be 68:32 blend ratio,50℃ kilning temperature and 1:7 slurry *** model F-value was found to be highly significant at 1% level of significance for all the *** the responses could be predicted by fitting the second order mathematical model and adequacy checked by R^(2).

关键词： beer production fermentation technology blend ratio alcohol content bitterness finger millet barley

Application of modified atmosphere packaging using silicone membrane system for shelf life extension of pomegranate (Punica granatum L.) and its effect on physico-chemical properties

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Food Quality and Safety 2019年第3期3卷 145-155页

作者： Shubhangi Srivastava Prashant Said Agricultural and Food Engineering department Indian Institute of TechnologyKharagpurWest BengalIndia College of Agricultural Engineering and post-harvest technology RanipoolSikkimIndia

Objectives:The study was conducted to prolong the shelf life of freshly harvested pomegranate fruits and to find out its physiochemical properties during *** and Methods:Pomegranate fruits of variety‘Bhagawa’were stored in 200,300 gauge high-density polyethylene(HDPE)package,and silicone membrane modified atmospheric storage system at ambient conditions and 10℃.Gas composition inside the package,texture,color,and overall quality parameters were evaluated at these two storage *** physico-chemical properties such as total soluble solids,titratable acidity,ascorbic acid content,total,reducing,and non-reducing sugars,and physiological loss in weight(PLW)were also ***:In ambient storage,the shelf life of pomegranate fruit was 10 days,whereas in modified atmosphere packaging(200 gauge HDPE,300 gauge HDPE,and silicone membrane system),the shelf life of pomegranate fruits was extended up to 60,60,25 days at ambient and 96,96,65 days at 10℃temperature,***:Among the 200,300 gauge HDPE package,and silicone membrane system treatments T1,T5,and T8,respectively,were found better with respect to all the sensory and quality parameters studied.

关键词： silicone membrane shelf life pomegranate temperature ripening

Enhanced post-combustion CO2 capture and direct air capture by plasma surface functionalization of graphene adsorbent

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Journal of Energy Chemistry 2025年第1期100卷 653-664页

作者： Rahul Navik Eryu Wang Xiao Ding Huang Yunyi Yiyu Liu Jia Li Guangdong-Hong Kong Joint Laboratory for Carbon Neutrality Jiangmen Laboratory of Carbon and Science and Technology Guangzhou HKUST Fok Ying Tung Research Institute The Hong Kong University of Science and technology (Guangzhou) Carbon Neutrality and Climate Change Thrust Society Hub The Hong Kong University of Science and Technology (Guangzhou) Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University

Graphene has enormous potential to capture CO2due to its unique properties and ***,graphene-based adsorbents have drawbacks of lower CO2adsorption capacity and poor *** work demonstrates a one-step rapid and sustainable N2/H2plasma treatment process to prepare graphene-based sorbent material with enhanced CO2adsorption *** treatment directly enriches amine species,increases surface area,and improves textural *** CO2adsorption capacity increases from 1.6 to 3.3 mmol/g for capturing flue gas,and from 0.14 to 1.3 mmol/g for direct air capture （DAC）.Importantly,the electrothermal property of the plasma-modified aerogels has been significantly improved,resulting in faster heating rates and significantly reducing energy consumption compared to conventional external heating for regeneration of *** aerogels display improved selectivity of 42 and 87 after plasma modification for 5 and 10 min,*** plasma-treated aerogels display minimal loss between 17%and 19% in capacity after 40 adsorption/desorption cycles,rendering excellent *** N2/H2plasma treatment of adsorbent materials would lower energy expenses and prevent negative effects on the global economy caused by climate change.

关键词： Carbon neutrality CO 2 capture Climate change Plasma treatment Graphene aerogel

Recent application of jackfruit waste in food and material engineering:A review

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Food Bioscience 2022年第4期48卷 252-262页

作者： S.B.Kalse S.B.Swami department of Agricultural Process Engineering College of Agricultural Engineering and TechnologyDapoli 415712Dist-RatnagiriMaharashtra StateDr.Balasaheb Sawant Konkan Krishi VidyapeethDapoliIndia department of post-harvest Engineering Post Graduate Institute of Post-Harvest ManagementKilla-Roha402116Dist:RaigadMaharashtra StateDr.Balasaheb Sawant Konkan Krishi VidyapeethDapoliIndia

Jackfruit(Artocarpus heterophyllus Lam.)processing industries generate considerable amount of solid wastes in the form of peels,seeds and latex which leads environmental pollution these waste can be utilized as an attractive source for different sustainable *** has a potential and alternative source of commercial pectin,activated carbon preparation,adsorbent to remove the various harmful dyes and metal ions from aqueous water and also utilized as a sustainable fuel as a bio hydrogen,biogas and ethanol *** seed flour having potentiality to replace wheat flour(25-30%)in bakery industry and it can also use as substrate for the production of red pigments which can be used as colorant in textile industry also useful for the preparation of Fast Dissolving *** latex utilized as the cementing medium,irrigation solution,denture cleaning solution,resin and other future dental filling material used as cost effective ***-product recovery from jackfruit wastes not only can improve the overall economics of processing units but also reduce the problem of environmental pollution *** review demonstrates the potential utilization of jackfruit waste.

关键词： Jackfruit Waste utilization Bio-energy Fast dissolve tablet Pectin

Dynamic viscoelastic behaviour,gelling properties of myofibrillar proteins and histological changes in shrimp(***)muscles during ice storage

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Aquaculture and Fisheries 2023年第2期8卷 180-189页

作者： Naresh Kumar Mehta Banalata Rout Amjad KBalange Binaya Bhusan Nayak department of Fish Processing technology and Engineering College of FisheriesCAU(I)LembucherraAgartalaTripura799210India department of post-harvest technology Central Institute of Fisheries EducationMumbai400061India

Changes in protein quality during ice storage affects the muscle structure,the textural quality,functional properties and the eating *** viscoelastic behaviour and gelling properties ofmeat proteinsin relation to histological changes in white leg shrimp muscles were assessed for 14 days in ice *** in Ca2+ATPase activity of fresh myofibrillar protein(MFP),fading of myosin banding pattern and increased gapping in myofibrils were clearly observed with progress of *** quality indices of the shrimp muscle were well correlated with histological and functional properties as a function of ice *** of fresh MFP was 86.76%which decreased to 77.06%on the 14th day of storage *** capacity found to increase during storage *** strength of white leg shrimp meat was low(81±14 g cm)and further,reduced nearly 60%compared to fresh sample at the end of *** considerable reductions(from 535.77 kPa to 246.56 kPa)in storage modulus values were evident of diminishing elasticity and gelling ability of the meat due to ice ***,this study usherd that the histological deterioration in myofibrils may be used as an indication of diminishing biochemical quality and gelling behaviour of the proteins.

关键词： White leg shrimp Myofibrillar proteins Quality Rheology Gel strength Functionality

Mechanical, electrical, and thermal expansion properties of carbon nanotube-based silver and silver–palladium alloy composites

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1132-1140页

作者： Hemant Pal Vimal Sharma department of Physics National Institute of Technology department of Physics Govt. Post graduate College

The mechanical, electrical, and thermal expansion properties of carbon nanotube（CNT）-based silver and silver–palladium（10：1, w/w） alloy nanocomposites are reported. To tailor the properties of silver, CNTs were incorporated into a silver matrix by a modified molecular level-mixing process. CNTs interact weakly with silver because of their non-reactive nature and lack of mutual solubility. Therefore, palladium was utilized as an alloying element to improve interfacial adhesion. Comparative microstructural characterizations and property evaluations of the nanocomposites were performed. The structural characterizations revealed that decorated type-CNTs were dispersed, embedded, and anchored into the silver matrix. The experimental results indicated that the modification of the silver and silver–palladium nanocomposite with CNT resulted in increases in the hardness and Young＇s modulus along with concomitant decreases in the electrical conductivity and the coefficient of thermal expansion（CTE）. The hardness and Young＇s modulus of the nanocomposites were increased by 30%？40% whereas the CTE was decreased to 50%-60% of the CTE of silver. The significantly improved CTE and the mechanical properties of the CNT-reinforced silver and silver–palladium nanocomposites are correlated with the intriguing properties of CNTs and with good interfacial adhesion between the CNTs and silver as a result of the fabrication process and the contact action of palladium as an alloying element.

关键词： metal matrix composites carbon nanotubes mechanical properties coefficient of thermal expansion electrical conductivity

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