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Erosion wear at the bend of pipe during tailings slurry transportation:Numerical study considering inlet velocity,particle size and bend angle

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1608-1620页

作者： Qiusong Chen hailong zhou Yunmin Wang Daolin Wang Qinli Zhang Yikai Liu School of Resources and Safety Engineering Central South UniversityChangsha 410083China Sinosteel Maanshan General Institute of Mining Research Co. Ltd.Maanshan 243000China Department of Geosciences University of Padova35131 PadovaItaly

Pipeline hydraulic transport is a highly efficient and low energy-consumption method for transporting solids and is commonly used for tailing slurry transport in the mining *** wear(EW)remains the main cause of failure in tailings slurry pipeline systems,particularly at *** is a complex phenomenon influenced by numerous factors,but research in this area has been *** study performs numerical simulations of slurry transport at the bend by combining computational fluid dynamics and fluid particle tracking using a wear *** on the validation of the feasibility of the model,this work focuses on the effects of coupled inlet velocity(IV)ranging from 1.5 to 3.0 m·s^(-1),particle size(PS)ranging from 50 to 650μm,and bend angle(BA)ranging from 45°to 90°on EW at the bend in terms of particle kinetic energy and incidence *** results show that the maximum EW rate of the slurry at the bend increases exponentially with IV and PS and first increases and then decreases with the increase in BA with the inflection point at 60°within these parameter *** comprehensive analysis reveals that the sensitivity level of the three factors to the maximum EW rate is PS>IV>BA,and when IV is 3.0 m/s,PS is 650μm,and BA is 60°,the bend EW is the most severe,and the maximum EW rate is 5.68×10^(-6)kg·m^(-2)·s^(-1).In addition,When PS is below or equal to 450μm,the maximum EW position is mainly at the outlet of the *** PS is greater than 450μm,the maximum EW position shifts toward the center of the bend with the increase in ***,EW at the bend can be reduced in practice by reducing IV as much as possible and using small particles.

关键词： tailings transportation erosion wear pipe wear CFD numerical simulation

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Thermal upgrading of Hui-style vernacular dwellings in China using foam concrete

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Frontiers of Architectural Research 2012年第1期1卷 23-33页

作者： Xing Shi Wei She hailong zhou Yunshen Zhang Fei shi Wei Chen Key Laboratory of Urban and Architectural Heritage Conservation Ministry of EducationSchool of ArchitectureSoutheastUniversityNanjing 210096China bKey Laboratory of Urban and Architectural Heritage Conservation Ministry of EducationSchool of Material Science and TechnologySoutheast UniversityNanjing 210096China Shandong lnstitute of Architectural Design and Research Shandong 250001China

Architecturat heritage conservation is an important field in architectural research. The Hui-styte vernacutar dwetling is an essentialarchitectural heritage of China. Its hollow watt system, with horsehead-like upper corners, is a distinct architecturat feature that is worth preserving. However, the thermat performance of the hollow watt is relatively poor by today＇s standard. The current study developed a novel approach, whereby foam concrete was used to fill the voids inside the holtow watt to improve its thermat resistance. This approach was deemed cost effective, easy to learn, and capable of preserving the architectural integrity of the watt. Different types of foam concrete were prepared and tested. Testing results showed that the material properties of foam concrete are suitabte for thermaUy upgrading the hollow watt system. Ctimate chamber testing was conducted to investigate the effectiveness of the proposed thermat upgrading strategy. The testing resutts suggested that tilting the voids with foam concrete can effectively improve the overall thermal resistance of the holtow watt system by 24%, which is almost equal to the overall thermal resistance when using the more expensive commercial inorganic stucco system.

关键词： Hui-styLe vernaculardweLLins Thermal upgrade Foam concrete Architectural heritase

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Chemical vapor deposition growth of monolayer MoSe2 nanosheets

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Nano Research 2014年第4期7卷 511-517页

作者： Jonathan C. Shaw hailong zhou Yu Chen Nathan O. Weiss Yuan Liu Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA Department of Materials Science and Engineering University of California Los Angeles CA 90095 USA California NanoSystems Institute University of California Los Angeles CA 90095 USA

The synthesis of two-dimensional （2D） layered materials with controllable thickness is of considerable interest for diverse applications. Here we report the first chemical vapor deposition growth of single- and few-layer MoSe2 nanosheets. By using Se and MoO3 as the chemical vapor supply, we demonstrate that highly crystalline MoSe2 can be directly grown on the 300 nm SiO2/Si substrates to form optically distinguishable single- and multi-layer nanosheets, typically in triangular shaped domains with edge lengths around 30 btm, which can merge into continuous thin films upon further growth. Micro-Raman spectroscopy and imaging was used to probe the thickness-dependent vibrational properties. Photoluminescence spectroscopy demonstrates that MoSe2 monolayers exhibit strong near band edge emission at 1.55 eV, while bilayers or multi-layers exhibit much weaker emission, indicating of the transition to a direct band gap semiconductor as the thickness is reduced to a monolayer.

关键词： chemical vapor deposition molybdenum diselenide two-dimensional materials transition metaldichalcogenide layered materials semiconductor

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On-chip photonic spatial-temporal descrambler

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Chip 2023年第2期2卷 1-7页

作者： Wenkai Zhang Xueyi Jiang Wentao Gu Junwei Cheng hailong zhou Jianji Dong Dongmei Huang Xinliang Zhang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Photonics Research Institute Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China

As an indispensable part to compensate for the signal crosstalk in fiber communication systems,conventional digital multi-input multi-output(MIMO)signal processor is facing the challenges of high com-putational complexity,high power consumption and relatively low processing *** optical MIMOenables the best use of light and has been proposed to remedy this ***,the currently existing optical MIMO methods are all restricted to the spatial di-mension,while the temporal dimension is ***,an on-chip spatial-temporal descrambler with four channels were devised and its MIMO functions were experimentally verified simultaneously in both spatial and temporal *** spatial crosstalk of single-channel descrambler and four-channel descrambler is respectively less than-21 dB and-18 dB,and the time delay is simultaneously com-pensated ***,a more universal model extended to mode-dependent loss and gain(MDL)compensation was further de-veloped,which is capable of being cascaded for the real optical trans-mission *** first attempt at photonic spatial-temporal de-scrambler enriched the varieties of optical MIMO,and the proposed scheme provided a new opportunity for all-optical MIMO signal pro-cessing.

关键词： Optical signal processing Photonic integrated circuits Opti-cal MIMO Optical matrix computing

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A small microring array that performs large complex-valued matrix-vector multiplication

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Frontiers of Optoelectronics 2022年第2期15卷 1-15页

作者： Junwei Cheng Yuhe Zhao Wenkai Zhang hailong zhou Dongmei Huang Qing Zhu Yuhao Guo Bo Xu Jianji Dong Xinliang Zhang Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China Photonics Research Centre Department of Electronic and Information EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Photonics Research Centre Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Institute of Strategic Research Huawei TechnologiesShenzhen 518129China

As an important computing operation,photonic matrix-vector multiplication is widely used in photonic neutral networks and signal ***,conventional incoherent matrix-vector multiplication focuses on real-valued operations,which cannot work well in complex-valued neural networks and discrete Fourier *** this paper,we propose a systematic solution to extend the matrix computation of microring arrays from the real-valued field to the complex-valued field,and from small-scale(i.e.,4×4)to large-scale matrix computation(i.e.,16×16).Combining matrix decomposition and matrix partition,our photonic complex matrix-vector multiplier chip can support arbitrary large-scale and complex-valued matrix *** further demonstrate Walsh-Hardmard transform,discrete cosine transform,discrete Fourier transform,and image convolutional *** scheme provides a path towards breaking the limits of complex-valued computing accelerator in conventional incoherent optical *** importantly,our results reveal that an integrated photonic platform is of huge potential for large-scale,complex-valued,artificial intelligence computing and signal processing.

关键词： Photonic matrix-vector multiplication Complex-valued computing Microring array Signal/image processing

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Photonic matrix multiplication lights up photonicaccelerator and beyond

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Light(Science & Applications) 2022年第2期11卷 158-178页

作者： hailong zhou Jianji Dong Junwei Cheng Wenchan Dong Chaoran Huang Yichen Shen Qiming Zhang Min Gu Chao Qian Hongsheng Chen Zhichao Ruan Xinliang Zhang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Department of Electronic Engineering The Chinese University of Hong KongShatinHong KongChina Lightelligence Hangzhou 311121China Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJUHangzhou Global Scientific and Technological Innovation CenterZJU-UIUC InstituteZhejiang UniversityHangzhou 310027China Interdisciplinary Center of Quantum Information State Key Laboratory of Modern Optical Instrumentationand Zhejiang Province Key Laboratory of Quantum Technology and DeviceDepartment of PhysicsZhejiang UniversityHangzhou 310027China

Matrix computation,as a fundamental building block of information processing in science and technology,contributes most of the computational overheads in modern signal processing and artificial intelligence *** accelerators are designed to accelerate specific categories of computing in the optical domain,especially matrix multiplication,to address the growing demand for computing resources and *** matrix multiplication has much potential to expand the domain of telecommunication,and artificial intelligence benefiting from its superior *** research in photonic matrix multiplication has flourished and may provide opportunities to develop applications that are unachievable at present by conventional electronic *** this review,we first introduce the methods of photonic matrix multiplication,mainly including the plane light conversion method,Mach–Zehnder interferometer method and wavelength division multiplexing *** also summarize the developmental milestones of photonic matrix multiplication and the related ***,we review their detailed advances in applications to optical signal processing and artificial neural networks in recent ***,we comment on the challenges and perspectives of photonic matrix multiplication and photonic acceleration.

关键词： interferometer beyond matrix

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Anti-parity-time symmetry enabled on-chip chiral polarizer

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Photonics Research 2022年第1期10卷 76-83页

作者： YANXIAN WEI hailong zhou YUNTIAN CHEN YUNHONG DING JIANJI DONG XINLIANG ZHANG Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China Department of Photonics Engineering Technical University of Denmark2800 LyngbyDenmark SiPhotonIC ApS 2830 VirumDenmark

Encircling an exceptional point(EP) in a parity-time(PT) symmetric system has shown great potential for chiral optical devices,such as chiral mode switching for symmetric and antisymmetric ***,to our best knowledge,chiral switching for polarization states has never been reported,although chiral polarization manipulation has significant applications in imaging,sensing,communication,***,inspired by the anti-PT symmetry,we demonstrate,for the first time to our best knowledge,an on-chip chiral polarizer by constructing a polarization-coupled anti-PT symmetric *** transmission axes of the chiral polarizer are different for forward and backward propagation.A polarization extinction ratio of over 10 dB is achieved for both propagating ***,a telecommunication experiment is performed to demonstrate the potential applications in polarization encoding *** provides a novel functionality for encircling-an-EP parametric evolution and offers a new approach for on-chip chiral polarization manipulation.

关键词： chiral symmetry parity

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Challenges in the early detection and intervention of the psychosis-risk syndrome

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上海精神医学 2015年第1期27卷 45-47页

作者： hailong LV Xin zhou Jingping ZHAO MentalHealthInstituteoftheSecondXiangyaHospital KeyLaboratoryofPsychiatryandMentalHealthofHunanProvinceCentralSouthUniversity

The concept of a clinical high-risk state for psychosis has been used to describe individuals who have prodromal symptoms of psychosis and, thus, are at high-risk of developing psychosis. This high-risk concept promotes a more detailed developmental understanding of the evolution of psychosis and provides a theoretical basis for providing necessary mental health services to people at clinically high-risk of developing psychosis. Early detection and intervention can potentially change the course of psychotic conditions and, thus, prevent or minimize the associated disability. This is a relatively new area of interest, so more studies are needed to fully understand this high-risk condition.

关键词：精神病风险早期诊断综合征早期检测状态床高

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Reduced graphene oxide/silicon nanowire hetero- structures with enhanced photoactivity and superior photoelectrochemical stability

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Nano Research 2015年第9期8卷 2850-2858页

作者： Xing Zhong Gongming wang Benjamin Papandrea Mufan Li Yuxi Xu Yu Chen Chih-Yen Chen hailong zhou Teng Xue Yongjia Li Dehui Li Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles California 90095 USA Department of Materials Science and Engineering University of California Los Angeles California 90095 USA California Nanosystems Institute University of California Los Angeles California 90095 USA

Silicon nanowires （SiNWs） have been widely studied as light harvesting antennas in photocatalysts due to their ability to absorb broad-spectrum solar radiation, but they are typically limited by poor photoelectrochemical stability. Here, we report the synthesis of reduced graphene oxide-SiNW （rGO-SiNW） heterostructures to achieve greatly improved photocatalytic activity and stability. The SiNWs were synthesized through a metal-assisted electroless etching process and functionalized with reduced graphene oxide （rGO） flakes through a chemical absorption process. Here, the rGO not only functions as a physical protection layer to isolate the SiNWs from the harsh electrochemical environment but also serves as a charge mediator to facilitate the charge separation and transport processes. Furthermore, the rGO may also function as a redox catalyst to ensure efficient utilization of photo-carriers for the desired chemical reactions. Photocatalytic dye degradation studies show that the photoactivity of the heterostructures can be significantly enhanced with an initial activation process and maintained without apparent decay over repeated reaction cycles. Electrochemical and photo- electrochemical studies indicate that the enhanced photoactivity and photostability can be attributed to the more efficient separation of photoexcited charge carriers in SiNWs and the reduced self-oxidation of the surface of the SiNWs during the photocatalytic dye degradation process. The ability to significantly improve the photocatalytic activity and stability in rGO-SiNW heterostructures can not only lead to more opportunities for the application of silicon-based photocatalysts/ photoelectrodes for solar energy harvesting but also provide new insights into the stabilization of other unstable photocatalytic

关键词： graphene,silicon nanowire,photocatalyst,photoactivity,stability

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冲击荷载下高强混凝土动力特性及破碎特征研究

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振动与冲击 2024年第11期43卷 320-326页

作者：韩长君周海龙王海龙内蒙古农业大学水利与土木建筑工程学院呼和浩特010018

为探究粉煤灰替代率和细集料类型对高强混凝土冲击压缩性能的影响,以粉煤灰替代水泥比例为0、10%、15%、20%、25%为胶凝材料,玄武岩机制砂和天然砂为细集料配制C80高强混凝土,利用分离式霍普金森杆对其开展冲击压缩试验,计算破碎体分形... 详细信息

为探究粉煤灰替代率和细集料类型对高强混凝土冲击压缩性能的影响,以粉煤灰替代水泥比例为0、10%、15%、20%、25%为胶凝材料,玄武岩机制砂和天然砂为细集料配制C80高强混凝土,利用分离式霍普金森杆对其开展冲击压缩试验,计算破碎体分形维数量化混凝土破碎特征,并借助扫描电镜(SEM)分析混凝土微观形貌。结果表明:机制砂混凝土(MSC)的峰值应力和韧性均高于天然砂混凝土(NSC);随着粉煤灰替代率增加,混凝土峰值应变逐渐降低;当粉煤灰替代率10%时,混凝土的峰值应力和韧性均达到最高值,且破碎体分形维数最小、平均块径最大、综合表现的破碎特征最简单;与未掺粉煤灰组混凝土相比,粉煤灰替代率10%时混凝土的微观形貌致密,孔隙数量减少,整体密实度提升。

关键词：粉煤灰玄武岩机制砂高强混凝土分离式霍普金森压杆(SHPB) 冲击压缩分形维数

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