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Observations of defect propagation in [100]-oriented opal-type photonic crystals

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Chinese Physics B 2008年第4期17卷 1298-1304页

作者：金崇君 Richard M.De la Rue Nigel P.Johnson Department of Electronics & Electrical Engineering University of Glasgow School of Physics and Engineering Laboratory of Optoelectronic Materials and TechnologiesSun Yat-Sen University

Charged colloidal suspensions have been used as experimental models for the study of crystal nucleation. Here we propose that the technique of template-assisted colloidal self-assembly can be used to visualize the effects of defect propagation in atomic crystal films produced using epitaxial growth. Templates with periodic line defects were used to grow [100]-oriented three-dimensional photonic crystals by means of the template-assisted colloidal self-assembly method, aided by capillary and gravitational forces. The defect propagation in the [100]-oriented photonic crystal was observed using scanning electron microscopy, both at the surface of the crystal and on cleaved facets. This method is useful in the understanding of defect propagation in the growth of colloidal films on templates - and the same approach may also prove useful for the understanding of atomic crystal growth on substrates with defects. Additionally, the deliberate incorporation of line defects may prove valuable as a way of introducing waveguide channels into three-dimensional photonic crystals.

关键词： photonic crystal colloidal crystal self-assembly

Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins

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Collagen and Leather 2023年第2期5卷 119-131页

作者： Yuanhang Xiao Jiajing Zhou Chunhua Wang Jinwei Zhang vera D.Radnaeva Wei Lin Department of Biomass and Leather Engineering Key Laboratory of Leather Chemistry and Engineering of Ministry of EducationSichuan UniversityChengdu 610065China Department of NanoEngineering University of California San Diego9500 Gilman DriveLa JollaCA 92093USA Department of Leather and Fur Technology Water Resources and Commodity Research East Siberia State University of Technology and ManagementUlan-UdeBuryatiaRussia 670013 National Engineering Research Center of Clean Technology in Leather Industry Sichuan UniversityChengdu 610065China

Restrictions on heavy metals,especially chromium,have encouraged alternative tanning systems that can reduce environmental and human health risks from conventional chrome-based *** this work,metal-free combination tanning was developed by using vegetable tannins and a triazine-based syntan containing active chlorine groups(SACC).Specifically,the relationship between leather performance(e.g.,hydrothermal stability and organoleptic properties)and technical protocols(e.g.,types and dose of tannins)was systematically *** optimized protocol involving a unique procedure(i.e.,10%SACC pre-tanning,shaving,and 25%wattle tanning)endowed the leather with high shrinkage temperature(~92℃)and met the Chinese standards for shoe upper leather(QB/T 1873-2010).Our method not only produces zero chrome-containing solid wastes,but also uses~75%less tannin for leather *** excellent leather performance was ascribed to the synergistic effects,where SACC and wattle diffused into collagen fibrils and may bind to collagen via covalent,hydrogen and ionic bonding,locking the hierarchical structure of collagen from microfibrils to fiber ***,we summarized these findings and proposed a diffusion-binding-locking mechanism,providing new insights for current tanning *** with the biodegradable spent tanning liquor,this approach will underpin the development of sustainable leather manufacture.

关键词： Metal-free tanning Triazine derivative Vegetable tannins Synergistic effect Eco-friendly leather

A taxonomic framework for autonomous service management in Service-Oriented Architecture

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第5期13卷 339-354页

作者： Du Wan CHEUN Hyun Jung la Soo Dong KIM Department of Computer Science Soongsil University

Since Service-Oriented Architecture (SOA) reveals the black box nature of services,heterogeneity,service dynamism,and service evolvability,managing services is known to be a challenging *** computing (AC) is a way of designing systems that can manage themselves without direct human ***,applying the key disciplines of AC to service management is appealing.A key task of service management is to identify probable causes for symptoms detected and to devise actuation methods that can remedy the *** SOA,there are a number of target elements for service remedies,and there can be a number of causes associated with each target ***,there is not yet a comprehensive taxonomy of causes that is widely *** lack of cause taxonomy results in the limited possibility of remedying the problems in an autonomic *** this paper,we first present a meta-model,extract all target elements for service fault management,and present a computing model for autonomously managing service *** we define fault taxonomy for each target element and inter-relationships among the ***,we show prototype implementation using cause taxonomy and conduct experiments with the prototype for validating its applicability and effectiveness.

关键词： Service-Oriented Architecture (SOA) Autonomic computing (AC) Cause taxonomy Services Faults Causes Adaptation

Micromechanical modeling of polycrystalline high manganese austenitic steel subjected to abrasive contact

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Friction 2020年第3期8卷 626-642页

作者： Matti LINDROOS Anssi la UKK ANEN Tom ANDERSSON VTT Lifecycle Solutions Tampere 33720Finland

This study focuses on microstructural and micromechanical modeling of abrasive sliding contacts of wear-resistant Hadfield steel.3 D finite element representation of the microstructure was employed with a crystal plasticity model including dislocation slip,deformation twinning,and their *** results showed that deformation twinning interacting with dislocations had a key role in the surface hardening of the material,and it was also important for the early hardening process of the sub-surface grains beyond the heavily distorted surface *** effects of grain orientation and microstructural features were discussed and analyzed according to the micromechanical model to give a perspective to the anisotropy of the material and the feasibility of using micromechanics in virtual material design.

关键词： crystal plasticity micromechanical modeling of abrasion austenitic manganese steel deformation twinning

Phonon imaging in 3D with a fibre probe

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Light(Science & Applications) 2021年第6期10卷 1007-1019页

作者： Salvatore la Cavera III Fernando Perez-Cota Richard JSmith Matt Clark Optics and Photonics Group Faculty of EngineeringUniversity of NottinghamUniversity ParkNottingham NG72RDUK

We show for the first time that a single ultrasonic imaging fibre is capable of simultaneously accessing 3D spatial information and mechanical properties from microscopic *** novel measurement system consists of two ultrafast lasers that excite and detect high-frequency ultrasound from a nano-transducer that was fabricated onto the tip of a single-mode optical fibre.A signal processing technique was also developed to extract nanometric in-depth spatial measurements from GHz frequency acoustic waves,while still allowing Brillouin spectroscopy in the frequency ***-free and non-contact imaging performance was demonstrated on various polymer *** singular device is equipped with optical lateral resolution,2.5μm,and a depth-profiling precision of 45 nm provided by *** endoscopic potential for this device is exhibited by extrapolating the single fibre to tens of thousands of fibres in an imaging *** a device catalyses future phonon endomicroscopy technology that brings the prospect of label-free in vivo histology within reach.

关键词： fibre equipped acoustics

Mobile robot SlaM method based on multi-agent particle swarm optimized particle filter

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The Journal of China Universities of Posts and Telecommunications 2014年第6期21卷 78-86页

作者： TANG Xian-lun LI la-mei JIANG Bo-jie Key laboratory of Industrial Internet of Things & Networked Control Ministry of EducationChongqing University of Posts and Telecommunications

To overcome particle impoverishment, a simultaneous localization and mapping（SlaM） method based on multi-agent particle swarm optimized particle filter（MAPSOPF） was presented by introducing the idea of multi-agent to the particle swarm optimized particle filter（PSOPF） which is an algorithm for SlaM. In MAPSOPF, agents can communicate and compete with each other and learn from each other. The MAPSOPF algorithm can update the prediction of particle, adjust the proposal distribution of particles, improve localization precision and fault tolerance, and propel the particles to concentrate on the robot＇s true pose. Compared with standard particle filter（PF）, the proposed method can achieve better SlaM precision by fewer particles. Simulations verify its effectiveness and feasibility.

关键词： PF multi-agent system(MAS) particle swarm optimization(PSO) SlaM

Establishment and Characterization of a Fin Cell Line Derived from the Atlantic Salmon Salmo salar and Its Application to Fish Virology Study

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Journal of Ocean University of China 2022年第4期21卷 946-954页

作者： JIA Peng LIN Lirong XU la YI Meisheng JIA Kuntong School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510000China Southern Marine Science and Engineering Guangdong laboratory(Zhuhai) Zhuhai 519082China Zhuhai Key laboratory of Marine Bioresources and Environment Sun Yat-sen UniversityGuangzhou 510000China Marine Biology Institute of Shandong Province Shandong Key Laboratory of Disease Control in MaricultureQingdao 266104China

Atlantic salmon(Salmo salar)is an important economic fish that is seriously threatened by various viruses.A cell line designated as ASF derived from the caudal fin tissue of Atlantic salmon was established and characterized in this *** cells grew well in Dulbecco’s modified Eagle’s medium(DMEM)containing 20%fetal bovine serum at 20℃.DNA sequencing and comparative analysis of the cytochrome B gene verified that the ASF cell line originated from Atlantic *** analysis indicated that the modal chromosome number of ASF cells was *** susceptibility test showed that ASF cells were susceptive to two important fish viruses,viral hemorrhagic septicemia virus(VHSV)and red-spotted grouper nervous necrosis virus(RGNNV).Viral replication in ASF cells was further confirmed by qRT-PCR and transmission electron ***,VHSV and RGNNV infections could induce the cellular responses in ASF cells,as indicated by the differential expression of cellular antiviral response-related genes,interferon-1 and *** conclusion,the newly established ASF cell line can be applied as an in vitro tool in fish virology and immunity studies.

关键词： Salmo salar cell line viral hemorrhagic septicemia virus nervous necrosis virus immune response

ZnSb/Ti_(3)C_(2)T_(x)MXene van der Waals heterojunction for flexible near-infrared photodetector arrays

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Journal of Semiconductors 2024年第5期45卷 99-105页

作者： Chuqiao Hu Ruiqing Chai Zhongming Wei la Li Guozhen Shen State Key laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronic Engineering University of Chinese Academy of SciencesBeijing 100049China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

Two-dimension(2D)van der Waals heterojunction holds essential promise in achieving high-performance flexible near-infrared(NIR)***,we report the successful fabrication of ZnSb/Ti_(3)C_(2)T_(x)MXene based flexible NIR photodetector array via a facile photolithography *** single ZnSb/Ti_(3)C_(2)T_(x)photodetector exhibited a high light-to-dark current ratio of 4.98,fast response/recovery time(2.5/1.3 s)and excellent stability due to the tight connection between 2D ZnSb nanoplates and 2D Ti_(3)C_(2)T_(x)MXene nanoflakes,and the formed 2D van der Waals *** polyethylene terephthalate(PET)substrate enables the ZnSb/Ti_(3)C_(2)T_(x)photodetector withstand bending such that stable photoelectrical properties with non-obvious change were maintained over 5000 bending ***,the ZnSb/Ti_(3)C_(2)T_(x)photodetectors were integrated into a 26×5 device array,realizing a NIR image sensing application.

关键词： ZnSb nanoplates Ti_(3)C_(2)T_(x)MXene van der Waals heterojunction flexible photodetector image sensing

Internal anal sphincter augmentation and substitution

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Gastroenterology Report 2014年第2期2卷 106-111页

作者： Fernando de la Portilla Unidad de Gestion Clinica de Cirugia General y del Aparato Digestivo Instituto de Biomedicina de Sevilla(IBIS)SevilleSpain

There is an increasing recognition of the importance of internal anal sphincter(IAS)dysfunction presenting as passive faecal *** problem may manifest after anal sphincterotomy or following the more minimally invasive operations for haemorrhoids,as well as with advancing *** of the poor results of IAS plication and the beneficial outcomes with peri-urethral bulking agents in urology,these materials have been developed for use in IAS *** review outlines the basic purported mechanisms of action,defining the materials in clinical use,their methods of deployment,complications and reported *** is still much that is unknown concerning the ideal agent or the volume and the technique of deployment,which will only be answered by powerful,prospective,randomized,controlled *** specific role of autologous stem cells designed to regenerate the sphincters in cases of functional impairment or muscle loss is yet to be seen.

关键词： faecal incontinence internal anal sphincter dysfunction internal anal sphincter augmentation bulking agents