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Influence of mass ratio and calcination temperature on physical and photoelectrochemical properties of ZnFe-layered double oxide/cobalt oxide heterojunction semiconductor for dye degradation applications

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Particuology 2023年第3期74卷 141-155页

作者： Yufei Zhang Junjie Zheng Jiejie Nan Chengjie Gai Qian Shao vignesh Murugadoss Srihari Maganti Nithesh Naik Hassan Algadi Mina Huang Ben Bin Xu Zhanhu Guo College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao266590China College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024China Integrated Composites Laboratory(ICL) Department of Chemical and Bimolecular EngineeringUniversity of TennesseeKnoxvilleTN37996United States Department of Mechanical&Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal576104KarnatakaIndia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon TyneNE18STUK Department of Electrical Engineering Faculty of EngineeringNajran UniversityNajran11001Saudi Arabia

A visible light-active photoelectrocatalyst,ZnFe-layered double oxide(LDO)/cobalt(II,III)oxide(Co_(3)O_(4))composites were obtained by calcining the Co loaded ZnFe-layered double hydroxide(LDH)prepared by a hydrothermal and microwave hydrothermal *** morphological studies revealed that the ZnFe-LDO/Co_(3)O_(4) composites exhibited a flower-like structure comprising Co_(3)O_(4) nanowires and ZnFe-LDO ***,when the mass ratio of Co(NO_(3))_(2)·6H_(2)O/LDH was 1:1.8 and the calcination temperature was 550℃,the ZnFe-LDO/Co_(3)O_(4) composite exhibited 93.3%degradation efficiency for methylene blue(MB)at the applied voltage of 1.0 V under visible light after 3 ***,the Mott-Schottky model experiments showed that the formation of a p-n heterojunction between ZnFe-LDO and Co_(3)O_(4) could effectively inhibit the recombination of electrons and holes in the photoelectrocatalytic ***,free radical scavenging experiments showed that the active radicals of⋅OH played an important role in the degradation of ***,the photoelectrocatalytic effect of ZnFe-LDO/Co_(3)O_(4) provides a simple and effective strategy for the removal of organic pollutants.

关键词： ZnFe-LDO/Co_(3)O_(4) Photoelectrocatalytic p-n heterojunction Methylene blue

The emerging role of somatic tumor sequencing in the treatment of urothelial cancer

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Asian Journal of Urology 2021年第4期8卷 391-399页

作者： Lexiaochuan Wen Cameron J.Britton Rohan Garje Benjamin W.Darbro vignesh T.Packiam Department of Urology Mayo ClinicRochesterMNUSA Division of Hematology OncologyBlood&Marrow TransplantationDepartment of Internal MedicineUniversity of IowaIowa CityIAUSA Stead Family Department of Pediatrics University of IowaIowa CityIAUSA Department of Urology University of IowaIowa CityIAUSA

The development of rapid genome sequencing has greatly enhanced our understanding of the molecular biology underlying many *** exome sequencing has highlighted the individualistic nature of malignancies on a patient-to-patient basis and begun to revolutionize therapeutic *** recent years,whole genome sequencing of urothelial malignancies has identified a host of somatic mutations which contribute to growth,progression,and metastasis of urothelial carcinoma of the bladder and upper tract urothelial *** genetic sequencing continues,additional targets will be identified,allowing development of novel therapeutic agents targeting cancer on a molecular level,with the goal of delivering highly individualized care based on the underlying mutational profile of the patient’s *** this review,we aim to discuss known genetic alterations of urothelial malignancy and the implications these mutations carry in terms of prognostication and development of targeted therapeutic *** will focus on RNA-expression profiling and genomic DNA profiling,with a focus on comprehensive whole exome and whole genome sequencing relative to selected urothelial carcinoma-associated genes and circulating tumor DNA analysis.

关键词： Tumor sequencing Whole exome sequencing Next-generation sequencing Somatic mutations Bladder cancer Urothelial carcinoma

Acoustic Properties of Micro-Perforated Panels Made from Oil Palm Empty Fruit Bunch Fiber Reinforced Polylactic Acid

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Sound & Vibration 2021年第4期55卷 343-352页

作者： vignesh Sekar Se Yong Eh Noum Azma Putra Sivakumar Sivanesan Kok Chun Chin Yi San Wong Dg Hafizah Kassim School of Computer Science and Engineering Taylor’s UniversitySubang Jaya47500Malaysia Centre for Advanced Research on Energy Universiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia Fakulti Kejuruteraan Mekanikal Universiti Teknikal Malaysia Melaka(UTeM)Melaka76100Malaysia

This paper presents the development and performance of micro-perforated panels(MPP)from natural fiber reinforced *** MPP is made of Polylactic Acid(PLA)reinforced with Oil Palm Empty Fruit Bunch Fiber(OPEFBF).The investigation was made by varying the fiber density,air gap,and perforation ratio to observe the effect on the Sound Absorption Coefficient(SAC)through the experiment in an impedance *** is found that the peak level of SAC is not affected,but the peak frequency shifts to lower frequency when the fiber density is *** phenomenon might be due to the presence of porosity in the inner wall of the *** or decreasing the air gap and perforation ratio shifts the peaks of acoustic absorption either way.

关键词： Acoustics micro-perforated panel natural fiber reinforced composite laser cutting impedance tube

Non-Negative Matrix Factorization Based UKF Algorithm for Constant Modulus Signals in Adaptive Beamforming

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Open Journal of Antennas and Propagation 2016年第3期4卷 119-127页

作者： Ranganathan vignesh K. A. Narayanankutty Department of Electronics and Communication Engineering Amrita School of Engineering Coimbatore Amrita Vishwa Vidyapeetham (Amrita University) Coimbatore India

Blind adaptive beamforming is getting appreciated for its various applications in contemporary communication systems where sources are statistically dependent or independent that are allowed to formulate new algorithms. Qualitative performance and time complexity are the main issues. In this paper, we propose a technique for constant modulus signals applying basic non-negative matrix factorization (BNMF) in blind adaptive beamforming environment. We compared the existing Unscented Kalman Filter based Constant Modulus Algorithm (UKF-CMA) with proposed NMF-UKF-CMA algorithm. We see there is a better improvement of sensor array gain, signal to interference plus noise ratio (SINR) and mean squared deviation (MSD) as the noise variance and the array size increase with reduced computational complexity with the UKF-CMA.

关键词： Blind Adaptive Beamforming NMF-UKF-CMA Performance Comparison UKF-CMA MSD SINR

Manipulation of blue TADF top-emission OLEDs by the first-order optical cavity design:toward a highly pure blue emission and balanced charge transport

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Photonics Research 2021年第8期9卷 1502-1512页

作者： WANQI REN KYUNG ROCK SON TAE HOON PARK vignesh MURUGADOSS TAE GEUN KIM School of Electrical Engineering Korea UniversitySeoul 02841Republic of Korea

The broad luminescence spectrum of a thermally activated delayed fluorescence(TADF)organic light-emitting diode(OLED)is a critical issue to overcome for its application in high-color-purity ***,a novel device structure that utilizes the first-order microcavity optical mode with a high radiance intensity is demonstrated to solve this problem by considering the charge transport properties through the analysis of hole-only and electron-only *** addition,by tuning the optical interference near the semitransparent top cathode layers consisting of thin silver and organic capping layers,light extraction is increased by nearly 2 times compared to the device without a capping ***,the optimized blue TADF top-emission OLED exhibits much lower full width at half-maximum,higher maximum current efficiency,and external quantum efficiency compared to the device before *** approach is expected to provide a simple but effective way to further enhance the spectral purity of the conventional TADF-based OLEDs.

关键词： OLEDs tuning charge

Effect of composition and aging time on hardness and wear behavior of Cu-Ni-Sn spinodal alloy

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Journal of Central South University 2019年第10期26卷 2634-2642页

作者： S.ILANGOVAN R.VAIRA vignesh R.PADMANABAN J.GOKULACHANDRAN Department of Mechanical Engineering Amrita School of Engineering

Copper alloyed with various compositions of nickel and tin were cast into molds under argon *** cast rods were homogenized,solution heat treated,followed by aging for different time *** specimens were characterized for microstructure and tested for microhardness and wear rate.A hybrid model with a linear function and radial basis function was developed to analyze the influence of nickel,tin,and aging time on the microhardness and tribological behavior of copper-nickel-sin alloy *** results indicate that increase in the composition of nickel and tin increases the microhardness and decreases the wear rate of the *** increase in the concentration of nickel and tin decreases the peak aging time of the alloy system.

关键词： spinodal decomposition microhardness wear radial basis function model

Is Distal Femur Locking Plate a Superior Implant in Distal Femur Fracture?

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Open Journal of Orthopedics 2015年第9期5卷 258-263页

作者： Anil Chander Ganesan Ram Ganesan vignesh Jayabalan Department of Orthopaedics Sri Ramachandra Medical Collage Chennai India

In spite of advances in techniques and improvements in surgical implants, confusion still prevails regarding use of specific implants in distal femur fracture. Fractures in the distal femur have posed considerable therapeutic challenges throughout the history of fracture treatment. Most of these surgical failures were due to inadequate fixation of the fracture fragments. The Aim of the study is to determine whether distal femur locking plates are superior implants than dynamic condylar screw and distal femur nail. A prospective and observational study was done in Department of Orthopaedics and Traumatology, Sri Ramachandra Medical Collage, Chennai between Jan. 2011 and Jan. 2015. Patients with distal femoral fractures, admitted into the hospital, were treated using various modes of internal fixation and followed up over a period of six months to one year and their functional outcome was evaluated. The functional and radiological assessment of patients during follow-up was done using Neer’s criteria. The use of any one of the implant, i.e. distal femur locking plates, dynamic condylar screw or distal femur nailing for internal fixation, depends on the type of fracture and the pre operative planning and intra operate decision of the surgeon. In our study, 38% of fractures treated by Dynamic condylar screw, 72% of fractures treated by distal femur locking plate and 42% of fractures treated by Distal femur supracondylar nail had excellent/satisfactory results. Locking plates had better outcome in both extra-articular and intra-articular group. They also had better outcome in both younger and older age groups.

关键词： Distal Femur Supacondylar Femur Distal Femur Locking Compression Plate Distal Femur Nail

Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose Aerogel Networks Enhanced Thermal Conductivity and Electromagnetic Absorbing of Epoxy Composites

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Nano-Micro Letters 2022年第7期14卷 209-227页

作者： Duo Pan Gui Yang Hala MAbo-Dief Jingwen Dong Fengmei Su Chuntai Liu Yifan Li Ben Bin Xu vignesh Murugadoss Nithesh Naik Salah MEl-Bahy Zeinhom MEl-Bahy Minan Huang Zhanhu Guo Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002People’s Republic of China Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK Integrated Composites Laboratory(ICL) Department of Chemical and Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Advanced Materials Division Engineered Multifunctional Composites(EMC)Nanotech LLCKnoxvilleTN 37934USA College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Mechanical and Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka 576104India Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry Al-Azhar UniversityNasr CityCairo 11884Egypt

With the innovation of microelectronics technology, the heat dissipation problem inside the device will face a severe test. In this work, cellulose aerogel(CA) with highly enhanced thermal conductivity(TC) in vertical planes was successfully obtained by constructing a vertically aligned silicon carbide nanowires(SiC NWs)/boron nitride(BN) network via the ice template-assisted strategy. The unique network structure of SiC NWs connected to BN ensures that the TC of the composite in the vertical direction reaches 2.21 W m^(-1) K^(-1) at a low hybrid filler loading of 16.69 wt%, which was increased by 890% compared to pure epoxy(EP). In addition, relying on unique porous network structure of CA, EP-based composite also showed higher TC than other comparative samples in the horizontal direction. Meanwhile, the composite exhibits good electrically insulating with a volume electrical resistivity about 2.35 × 10^(11) Ω cm and displays excellent electromagnetic wave absorption performance with a minimum reflection loss of-21.5 dB and a wide effective absorption bandwidth(<-10 dB) from 8.8 to 11.6 GHz. Therefore, this work provides a new strategy for manufacturing polymer-based composites with excellent multifunctional performances in microelectronic packaging applications.

关键词： Epoxy Ice template Vertical alignment Thermal conductivity Multifunctionality

Chitosan DNA nanoparticles for oral gene delivery

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World Journal of Medical Genetics 2016年第3期6卷 22-33页

作者： Bhavika J Patel Nithin K vignesh Gonzalo Hortelano Department of Health Sciences McMaster University Department of Biology School of Science and Technology Nazarbayev University School of Biomedical Engineering McMas-ter University Department of Pathology and Molecular Medicine McMaster University

Gene therapy is a promising technology with potential applications in the treatment of medical conditions, both congenital and acquired. Despite its label as breakthrough technology for the 21st century, the simple concept of gene therapy - the introduction of a functional copy of desired genes in affected individuals - is proving to be more challenging than expected. Oral gene delivery has shown intriguing results and warrants further exploration. In particular, oral administration of chitosan DNA nano-particles, one the most commonly used formulations of therapeutic DNA, has repeatedly demonstrated successful in vitro and in vivo gene transfection. While oral gene therapy has shown immense promise as treatment options in a variety of diseases, there are still signifcant barriers to overcome before it can be considered for clinical applications. In this review we provide an over-view of the physiologic challenges facing the use of chitosan DNA nanoparticles for oral gene delivery at both the extracellular and intracellular level. From administration at the oral cavity, chitosan nanoparticles must traverse the gastrointestinal tract and protect its DNA contents from signifcant jumps in pH levels, various intestinal digestive enzymes, thick mucus layers with high turnover, and a proteinaceous glycocalyx meshwork. Once these extracellular barriers are overcome, chitosan DNA nanoparticles must enter intestinal cells, escape endolysosomes, and disassociate from genetic material at the appropriate time allowing transport of genetic material into the nucleus to deliver a therapeutic ef-fect. The properties of chitosan nanoparticles and modified nanoparticles are discussed in this review. An understanding of the barriers to oral gene delivery and how to overcome them would be invaluable for future gene therapy development.

关键词： Gene therapy Oral gene delivery Chitosan nanoparticles Glycocalyx pH Enzymes Endolysosomal escape Intracellular transport Nuclear transport Mucus