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Manufacturing of graphene based synaptic devices for optoelectronic applications

International Journal of Extreme Manufacturing 2023年第4期5卷 150-177页

作者： Kui Zhou Ziqi Jia Xin-Qi Ma Wenbiao Niu Yao Zhou Ning Huang Guanglong Ding Yan Yan Su-Ting Han Vellaisamy A l roy Ye Zhou Institute for Advanced Study Shenzhen UniversityShenzhen 518060People’s Republic of China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China School of Science and Technology Hong Kong Metropolitan UniversityHong Kong Special Administrative Region of ChinaPeople’s Republic of China James Watt School of Engineering University of GlasgowGlasgow G128QQUnited Kingdom

Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottlenecks at hardware *** optoelectronic synapses enable the synergistic coupling between optical and electrical signals in synaptic modulation,which opens up an innovative path for effective neuromorphic *** the advantages of high mobility,optical transparency,ultrawideband tunability,and environmental stability,graphene has attracted tremendous interest for electronic and optoelectronic *** progress highlights the significance of implementing graphene into artificial synaptic ***,to better understand the potential of graphene-based synaptic devices,the fabrication technologies of graphene are first ***,the roles of graphene in various synaptic devices are ***,their typical optoelectronic applications in neuromorphic systems are ***,outlooks for development of synaptic devices based on graphene are *** review will provide a comprehensive understanding of graphene fabrication technologies and graphene-based synaptic device for optoelectronic applications,also present an outlook for development of graphene-based synaptic device in future neuromorphic systems.

关键词： graphene synaptic device memristor optoelectronic applications

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Nanowire-based synaptic devices for neuromorphic computing

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Materials Futures 2023年第2期2卷 94-108页

作者： Xue Chen Bingkun Chen Pengfei Zhao Vellaisamy A l roy Su-Ting Han Ye Zhou Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060People’s Republic of China College of Physics and Optoelectronic Engineering Harbin Engineering UniversityHarbin 150001People’s Republic of China School of Science and Technology Hong Kong Metropolitan UniversityHong KongSARPeople’s Republic of China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Institute for Advanced Study Shenzhen UniversityShenzhen 518060People’s Republic of China

The traditional von Neumann structure computers cannot meet the demands of high-speed big data processing;therefore,neuromorphic computing has received a lot of interest in recent ***-inspired neuromorphic computing has the advantages of low power consumption,high speed and high *** human brains,the data transmission and processing are realized through *** synaptic devices can be adopted to mimic the biological synaptic ***(NW)is an important building block for nanoelectronics and optoelectronics,and many efforts have been made to promote the application of NW-based synaptic devices for neuromorphic ***,we will introduce the current progress of NW-based synaptic memristors and synaptic *** applications of NW-based synaptic devices for neuromorphic computing will be *** challenges faced by NW-based synaptic devices will be *** hope this perspective will be beneficial for the application of NW-based synaptic devices in neuromorphic systems.

关键词： nanowires synapse memristor transistor neuromorphic computing

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Pediatric thermal burn injury:A retrospective analysis from pediatric care institutes,Eastern India

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Journal of Integrative Nursing 2023年第2期5卷 108-114页

作者： Kartik Chandra MANDAl Sourav roy Pankaj Kumar HAlDER Partha CHAKRABORTY l.NEIlASANO Debasree GUHA Department of Pediatric Surgery Dr.B.C.Roy Post Graduate Institute of Pediatric SciencesKolkataWest BengalIndia Department of Pediatric Surgery R.G.Kar Medical CollegeKolkataWest BengalIndia Department of General Surgery R.G.Kar Medical CollegeKolkataWest BengalIndia Department of Pediatric Medicine R.G.Kar Medical CollegeKolkataWest BengalIndia

Objective:Pediatric burns pose difficult healthcare issues in underdeveloped *** to the scarcity of pediatric burn care facilities and qualified burn‑care staff,patients are frequently referred from a rural *** study explores the burn‑treatment approach that could be used in rural hospitals in the absence of a dedicated pediatric burn care *** and Methods:A retrospective analysis of clinical data of 199 children who received treatment for burn‑injury in an isolated general surgical *** debridement under anesthesia at the earliest was the cornerstone of the treatment plan for this *** the wounds healed,the treatment was repeated every alternate *** patient’s demographic data,number of surgical dressings,length of hospital stay,and outcome were ***:The mean age of the patients was 51.68±23.79 *** male‑female ratio was 1.45:*** survival rate was 99.00%.The disability rate was 4.52%.Univariate logistic regression identified the age group,total body surface area affected,depth of the wound,and time of intervention as statistically significant variables(Plogistic regression identified the time intervals between surgical intervention and injury as an important predictor of *** addition,delayed presentation and delayed intervention led to a longer hospital stay,and more interventions than the early intervention ***:Early debridement accelerates recovery and lessens the need for future skin grafts or contracture *** approach can be used in rural hospitals as well because pediatric burns can be manageable in an isolated general ward.

关键词： Anesthesia burn cleaning closed debridement dehydration hypothermia paraffin oil pediatric

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Emerging resistance vs. losing response to immune check point inhibitors in renal cell carcinoma: two differing phenomena

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Cancer Drug Resistance 2023年第3期6卷 642-655页

作者： Arya Mariam roy Saby George Division of Hematology and Oncology Department of Internal MedicineRoswell Park Comprehensive Cancer CenterBuffaloNY 14203USA

The introduction of immune checkpoint inhibitor (ICI) has revolutionized the treatment of metastatic renal cell carcinoma (mRCC) and has dramatically improved the outcomes of patients. The use of monotherapy or combinations of ICIs targeting PD-1/PD-l1 and CTlA-4, as well as the addition of ICIs with tyrosine kinase inhibitors, has significantly enhanced the overall survival of mRCC patients. Despite these promising results, there remains a subset of patients who either do not respond to treatment (primary resistance) or develop resistance to therapy over time (acquired resistance). Understanding the mechanisms underlying the development of resistance to ICI treatment is crucial in the management of mRCC, as they can be used to identify new targets for innovative therapeutic strategies. Currently, there is an unmet need to develop new predictive and prognostic biomarkers that can aid in the development of personalized treatment options for mRCC patients. In this review, we summarize several mechanisms of ICI resistance in RCC, including alterations in tumor microenvironment, upregulation of alternative immune checkpoint pathways, and genetic and epigenetic changes. Additionally, we highlight potential strategies that can be used to overcome resistance, such as combination therapy, targeted therapy, and immune modulation.

关键词： Renal cell carcinoma immunotherapy immune checkpoint inhibitors primary resistance acquired resistance immune exhaustion markers immunosuppressive tumor microenvironment

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An experimental approach to addressing ecological questions related to the conservation of plant biodiversity in China

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植物分类与资源学报 2016年第1期38卷 1-10页

作者： roy Turkington William l.Harrower Botany Department and Biodiversity Research CentreUniversity of British Columbia

We briefly introduce and describe seven questions related to community structure and biodiversity conservation that can be addressed using field experiments,and provide the context for using the vast geographic diversity,biodiversity,and network of Nature Reserves in China to perform these *** is the world's third largest country,has a diverse topography,covers five climatic zones from cold-temperate to tropical,has 18 vegetation biomes ranging from Arctic / alpine tundra and desert to Tropical rain forest,and supports the richest biodiversity in the temperate northern hemisphere( > 10%of the world total). But this tremendous natural resource is under relentless assault that threatens to destroy biodiversity and negatively impact the services ecosystems provide. In an attempt to prevent the loss of biodiversity,China has established 2,729 nature reserves which cover 14.84% of the nation' s area. Unfortunately underfunding,mismanagement,illegal activities,invasive species and global climate change threaten the effectiveness of these protected areas. Attention has focused on protecting species and their habitats before degradation and loss of either species or habitats occur. Here we argue that we must move beyond the simple protection of ecosystems,beyond their description,and by using experiments,try to understand how ecosystems work. This new understanding will allow us to design conservation programs,perform restoration of damaged or degraded areas,and address resource management concerns( e.g.,agriculture,logging,mining,hunting) more effectively than with the current approach of ad hoc reactions to ecological and environmental problems. We argue that improving our understanding of nature can best be done using well designed,replicated,and typically manipulative field experiments.

关键词：植物学植物分类植物生态学植物演化

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A comparison of three surface roughness characterization techniques:photogrammetry,pin profiler,and smartphone-based liDAR

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International Journal of Digital Earth 2022年第1期15卷 2422-2439页

作者： Zohreh Alijani Julien Meloche Alexander Mclaren John lindsay Alexandre roy Aaron Berg Department of Geography Environment and GeomaticsUniversity of GuelphGuelphCanada Département de Géomatique Appliquée Université de SherbrookeSherbrookeCanada Département des Sciences de l’Environment Université du Québec à Trois-RivièresTrois-RivièresCanada

Surface roughness plays an important role in microwave remote *** the agricultural domain,surface roughness is crucial for soil moisture retrieval methods that use electromagnetic surface scattering or microwave radiative transfer ***,improved characterization of Soil Surface Roughness(SSR)is of considerable *** this study,three approaches,including a standard pin profiler,a liDAR point cloud generated from an iPhone 12 Pro,and a Structure from Motion(SfM)photogrammetric point cloud,were applied over 24 surface profiles with different roughness variations to measure surface *** objective of this study was to evaluate the capability of smartphone-based liDAR technology to measure surface roughness parameters and compare the results of this technique with the more common *** showed that the iPhone liDAR technology,when point cloud data is captured in a fine-resolution mode,has a significant correlation with SfM photogrammetry(R2=0.70)and a relatively close agreement with pin profiler(R2=0.60).However,this accuracy tends to be greater for random surfaces and rough profiles with row structure *** results of this study confirm that smartphone-based liDAR can be used as a cost-effective,fast,and time-efficient alternative tool for measuring surface roughness,especially for rough,wide,and inaccessible areas.

关键词： liDAR surface roughness structure from motion iPhone pin profiler

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Fabrication of graphene oxide-keratin-chitosan nanocomposite as an adsorbent to remove turbidity from tannery wastewater

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Water Science and Engineering 2023年第2期16卷 184-191页

作者： Kobita roy Thuhin Kumar Dey Mamun Jamal Rajasekar Rathanasamy Moganapriya Chinnasamy MdElias Uddin Department of leather Engineering Faculty of Mechanical EngineeringKhulna University of Engineering&TechnologyKhulna 9203Bangladesh Department of Chemistry Faculty of Civil EngineeringKhulna University of Engineering&TechnologyKhulna 9203Bangladesh Department of Mechanical Engineering Kongu Engineering CollegeErodeTamilnadu 638052India Department of Mining Engineering Indian Institute of Technology KharagpurWest Bengal 721302India

Excessive turbidity in water is aesthetically unappealing and severely malfunctions the photosynthesis process of aquatic ecosystems. This study aimed to evaluate the effectiveness of a nanocomposite adsorbent made of graphene oxide-keratin-chitosan for removing turbidity from tannery influent. The nanocomposite was fabricated with simple solution casting methods. Material dispersibility, bonding between composite materials (amide linkage), and the surface morphology of the nanocomposite were analyzed with the ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. At pH of 6, 2 g/l of adsorbent and a 25-min contact time resulted in about 88% of turbidity elimination. After the adsorption process, the total suspended solids, total dissolved solids, salinity, biochemical oxygen demand, and chemical oxygen demand of the tannery wastewater were reduced by 55%, 29%, 12%, 58%, and 75%, respectively. The optimum dosage of the nanocomposite with the maximum turbidity removal capacity was 12.62 mg/g. According the adsorption kinetic and isotherm models, the graphene oxide-keratin-chitosan nanocomposite played a key role in the turbidity removal process with chemisorption and electrostatic multilayer adsorption. This study provided methodological and mechanistic insights into the procedures of investigating the removal of turbidity from tannery wastewater with a novel composite material.

关键词： Adsorption Chitosan Electrostatic interaction Nanocomposite Wastewater

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Fast and accurate machine learning prediction of phonon scattering rates and lattice thermal conductivity

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npj Computational Materials 2023年第1期9卷 1367-1376页

作者： Ziqi Guo Prabudhya roy Chowdhury Zherui Han Yixuan Sun Dudong Feng Guang lin Xiulin Ruan Department of Mechanical Engineering Purdue UniversityWest Lafayette 47907-2088 INUSA The Birck Nanotechnology Center Purdue UniversityWest Lafayette 47907-2088 INUSA Department of Mathematics Purdue UniversityWest Lafayette 47907-2088 INUSA

lattice thermal conductivity is important for many applications,but experimental measurements or first principles calculations including three-phonon and four-phonon scattering are expensive or even *** learning approaches that can achieve similar accuracy have been a long-standing open *** recent progress,machine learning models using structural information as descriptors fall short of experimental or first principles *** study presents a machine learning approach that predicts phonon scattering rates and thermal conductivity with experimental and first principles *** success of our approach is enabled by mitigating computational challenges associated with the high skewness of phonon scattering rates and their complex contributions to the total thermal *** learning between different orders of phonon scattering can further improve the model *** surrogates offer up to two orders of magnitude acceleration compared to first principles calculations and would enable large-scale thermal transport informatics.

关键词： spite learning principles

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Implementation of Caterpillar Inspired Rolling Gait and Nonlinear Control Strategy in a Spherical Robot

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Journal of Bionic Engineering 2018年第2期15卷 313-328页

作者： Abhra roy Chowdhury Gim Song Soh Shaohui Foong Kristin l. Wood Temasek laboratories Engineering Product Development Pillar Singapore University of Technology and Design Singapore 487372 SUTD-MIT International Design Centre Singapore University of Technology and Design Singapore 487372

This paper presents a novel Central Pattern Generator （CPG） based rolling gait generation in a small-sized spherical robot and its nonlinear control mechanism. A rhythmic rolling pattern mimicking Pleurotya caterpillar is produced for the spherical robot locomotion. A synergetically combined feedforward-feedback control strategy is proposed. The feedforward component is generated from centrally connected network of CPGs in conjunction with nonlinear robot dynamics. Two nonlinear feedback control methods namely integral （first order） Sliding Mode Control （SMC） and High （or second） Order Sliding Mode Control （HOSMC） are proposed to regulate robot stability and gait robustness in the presence of matched parameter uncertainties and bounded external disturbances. Design, implementation and experimental evaluation of both roll gait control strategies for the spherical robot are done on smooth （indoor） and irregular （outdoor） ground surfaces, The performance of robot control is quantified by measuring the roll angle stability, phase plane convergence and wheel velocities. Experimental results show that proposed novel strategy is efficient in producing a stable rolling gait and robust control of a spherical robot on two different types of surfaces. It further shows that proposed high HOSMC strategy is more efficient in robust rolling gait control of a spherical robot compared to an integral first-order SMC on two different ground conditions.

关键词： bioinspired spherical robot rolling gait CPG rolling friction integral first-order SMC control HOSMC

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Improving the performance of polymer solar cells by adjusting the crystallinity and nanoscale phase separation

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Chinese Physics B 2012年第7期21卷 581-586页

作者：陈卫兵许宗祥李凯徐先贤 roy V.A.l. 黎沛涛支志明 School of Computer and Communication Hunan University of Technology Department of Chemistry Institute of Molecular Functional Materials and HKU-CAS Joint Laboratory on New MaterialsThe University of Hong Kong Department of Physics and Materials Science City University of Hong Kong Department of Electrical&Electronic Engineering The University of Hong Kong

In this paper, we report a high-perfornmnce P3HT/PCBM bulk-heterojunction solar cell with a power conversion efficiency of 4.85% fabricated by adjusting the polymer crystallinity and nanoscale phase separation using an ultrasonic irradiation mixing approach for the polymer. The grazing incidence X-ray diffraction, UV/Vis spectroscopic, and atomic force microscopic measurement results for the P3HT/PCBM blend films reveal that the P3HT/PCBM film fabricated by ultrasonic irradiation mixing of the P3HT and PCBM solutions for 10 min has a higher degree of crystallinity, a higher absorption efficiency, and better phase separation, which together account for the higher charge transport properties and photovoltaic cell performance.

关键词： crystallinity polymer solar cell ultrasonic irradiation nanoscale phase separation

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