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工程（英文）
工程（英文）

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2095-8099

工程（英文）/Journal EngineeringCSTPCDCSCD北大核心SCI
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    Newly Launched Satellite Seeks to Keep Methane Emitters Honest

    Sean O'Neill
    1-3页
      原文链接:
    • 万方数据
    • 维普

    Innovations Not Enough-Yet-to Make Headset Market an Actual Reality

    Chris Palmer
    4-6页
      原文链接:
    • 万方数据

    Understanding the Resilience of Urban Rail Transit:Concepts,Reviews,and Trends

    Yun WeiXin YangXiao XiaoZhiao Ma...
    7-18页
    查看更多>>摘要：As the scale of urban rail transit(URT)networks expands,the study of URT resilience is essential for safe and efficient operations.This paper presents a comprehensive review of URT resilience and highlights potential trends and directions for future research.First,URT resilience is defined by three primary abil-ities:absorption,resistance,and recovery,and four properties:robustness,vulnerability,rapidity,and redundancy.Then,the metrics and assessment approaches for URT resilience were summarized.The met-rics are divided into three categories:topology-based,characteristic-based,and performance-based,and the assessment methods are divided into four categories:topological,simulation,optimization,and data-driven.Comparisons of various metrics and assessment approaches revealed that the current research trend in URT resilience is increasingly favoring the integration of traditional methods,such as conven-tional complex network analysis and operations optimization theory,with new techniques like big data and intelligent computing technology,to accurately assess URT resilience.Finally,five potential trends and directions for future research were identified:analyzing resilience based on multisource data,opti-mizing train diagram in multiple scenarios,accurate response to passenger demand through new tech-nologies,coupling and optimizing passenger and traffic flows,and optimal line design.
      原文链接:
    • 万方数据
    • 维普

    Current Status,Challenges,and Prospects for New Types of Aerial Robots

    Xidong ZhouHang ZhongHui ZhangWei He...
    19-34页
    查看更多>>摘要：New types of aerial robots(NTARs)have found extensive applications in the military,civilian contexts,scientific research,disaster management,and various other domains.Compared with traditional aerial robots,NTARs exhibit a broader range of morphological diversity,locomotion capabilities,and enhanced operational capacities.Therefore,this study defines aerial robots with the four characteristics of morpha-bility,biomimicry,multi-modal locomotion,and manipulator attachment as NTARs.Subsequently,this paper discusses the latest research progress in the materials and manufacturing technology,actuation technology,and perception and control technology of NTARs.Thereafter,the research status of NTAR sys-tems is summarized,focusing on the frontier development and application cases of flapping-wing micro-air vehicles,perching aerial robots,amphibious robots,and operational aerial robots.Finally,the main challenges presented by NTARs in terms of energy,materials,and perception are analyzed,and the future development trends of NTARs are summarized in terms of size and endurance,mechatronics,and com-plex scenarios,providing a reference direction for the follow-up exploration of NTARs.
      原文链接:
    • 万方数据
    • 维普

    A Single-Board Integrated Millimeter-Wave Asymmetric Full-Digital Beamforming Array for B5G/6G Applications

    Qingqing LinJun XuKai ChenLong Wang...
    35-50页
    查看更多>>摘要：In this article,a single-board integrated millimeter-wave(mm-Wave)asymmetric full-digital beamform-ing(AFDBF)array is developed for beyond-fifth-generation(B5G)and sixth-generation(6G)communica-tions.The proposed integrated array effectively addresses the challenge of arranging a large number of ports in a full-digital array by designing vertical connections in a three-dimensional space and success-fully integrating full-digital transmitting(Tx)and receiving(Rx)arrays independently in a single board.Unlike the traditional symmetric array,the proposed asymmetric array is composed of an 8 × 8 Tx array arranged in a square shape and an 8+8 Rx array arranged in an L shape.The center-to-center distance between two adjacent elements is 0.54 λ0 for both the Tx and Rx arrays,where λ0 is the free-space wave-length at 27 GHz.The proposed AFDBF array possesses a more compact structure and lower system hard-ware cost and power consumption compared with conventional brick-type full-digital arrays.In addition,the energy efficiency of the proposed AFDBF array outperforms that of a hybrid beamforming array.The measurement results indicate that the operating frequency band of the proposed array is 24.25-29.50 GHz.An eight-element linear array within the Tx array can achieve a scanning angle ranging from-47° to+47° in both the azimuth and the elevation planes,and the measured scanning range of each eight-element Rx array is-45° to+45°.The measured maximum effective isotropic radiated power(EIRP)of the eight-element Tx array is 43.2 dBm at 28.0 GHz(considering the saturation point).Furthermore,the measured error vector magnitude(EVM)is less than 3％when 64-quadrature amplitude modulation(QAM)waveforms are used.
      原文链接:
    • 万方数据
    • 维普

    A High-Resolution Measurement Method for Inner and Outer 3D Surface Profiles of Laser Fusion Targets Using a Laser Differential Confocal-Atomic Force Probe Technique

    Weiqian ZhaoZihao LiuLirong Qiu
    51-60页
    查看更多>>摘要：The high-resolution and nondestructive co-reference measurement of the inner and outer three-dimensional(3D)surface profiles of laser fusion targets is difficult to achieve.In this study,we propose a laser differential confocal(LDC)-atomic force probe(AFP)method to measure the inner and outer 3D surface profiles of laser fusion targets at a high resolution.This method utilizes the LDC method to detect the deflection of the AFP and exploits the high spatial resolution of the AFP to enhance the spatial reso-lution of the outer profile measurement.Nondestructive and co-reference measurements of the inner profile of a target were achieved using the tomographic characteristics of the LDC method.Furthermore,by combining multiple repositionings of the target using a horizontal slewing shaft,the inner and outer 3D surface profiles of the target were obtained,along with a power spectrum assessment of the entire surface.The experimental results revealed that the respective axial and lateral resolutions of the outer profile measurement were 0.5 and 1.3 nm,while the respective axial and lateral resolutions of the inner profile measurement were 2.0 nm and approximately 400.0 nm.The repeatabilities of the root-mean-square deviation measurements for the outer and inner profiles of the target were 2.6 and 2.4 nm,respectively.We believe our study provides a promising method for the high-resolution and nondestruc-tive co-reference measurement of the inner and outer 3D profiles of laser fusion targets.
      原文链接:
    • 万方数据

    A Single-Sized Metasurface for Image Steganography and Multi-Key Information Encryption

    Congling LiangTian HuangQi DaiZile Li...
    61-70页
    查看更多>>摘要：With the escalating flow of information and digital communication,information security has become an increasingly important issue.Traditional cryptographic methods are being threatened by advancing pro-gress in computing,while physical encryption methods are favored as a viable and compelling avenue.Metasurfaces,which are known for their extraordinary ability to manipulate optical parameters at the nanoscale,exhibit significant potential for the revolution of optical devices,making them a highly promising candidate for optical encryption applications.Here,a single-sized metasurface with four inde-pendent channels is proposed for conducting steganography and multi-key information encryption.More specifically,plaintext is transformed into a ciphertext image,which is encoded into a metasurface,while the decryption key is discretely integrated into another channel within the same metasurface.Two dif-ferent keys for steganographic image unveiling are also encoded into the metasurface and can be retrieved with different channels and spatial positions.This distributed multi-key encryption approach can enhance security,while strategically distributing images across distinct spatial zones serves as an additional measure to reduce the risk of information leakage.This minimalist designed metasurface,with its advantages of high information density and robust security,holds promise across applications includ-ing portable encryption,high-camouflaged image display,and high-density optical storage.
      原文链接:
    • 万方数据
    • 维普

    Utilization of Bubbles and Oil for Microplastic Capture from Water

    Joshua SaczekXiaoxue YaoVladimir ZivkovicMohamed Mamlouk...
    71-83页
    查看更多>>摘要：The removal of microplastics(MPs)from water using oil has shown early promise;however,incorpora-tion of this technique into a feasible in situ method has yet to be developed.Here,a simple yet effective method of MP capture from water using vegetable oil with bubbles is demonstrated to achieve high removal efficiencies of＞98％.Comparisons are made with other methods of agitation,and higher removal efficiencies are observed when bubbles are used.Due to the low agitation provided by the bubbles,the oil layer remains unbroken,meaning that no oil is released into the bulk water phase.In this way,secondary contamination is avoided-unlike membrane filtration,another effective removal method,in which polymer-based membranes can break down due to chemical backwashing and ageing.It is demonstrated that variation in MP size within the micrometer range(50-170 μm)has minor impact on the removal efficiency;however,100％removal is achieved for larger,millimeter-sized MPs(500-5000 μm).Similarly,a high removal efficiency of greater than 99％is achieved in the capture of microfibers.Other factors such as oil volume and water salinity are also investigated and discussed.Based on these results,the proposed method can be introduced into multiple setting types as a passive and continuous method of MP capture.
      原文链接:
    • 万方数据
    • 维普

    Direct Ethylene Purification from Cracking Gas via a Metal-Organic Framework Through Pore Geometry Fitting

    Yang ChenZhenduo WuLonglong FanRajamani Krishna...
    84-92页
    查看更多>>摘要：The direct one-step separation of polymer-grade C2H4 from complex light hydrocarbon mixtures has high industrial significance but is very challenging.Herein,an ethylene-adsorption-weakening strategy is applied for precise regulation of the pore geometry of four tailor-made metal-organic frameworks(MOFs)with pillar-layered structures,dubbed TYUT-10/11/12/13.Based on its pore geometry design and functional group regulation,TYUT-12 exhibits exceptional selective adsorption selectivity toward C3H8,C3H6,C2H6,C2H2,and CO2 over C2H4;its C2H6/C2H4 adsorption selectivity reaches 4.56,surpassing the record value of 4.4 by Fe2(O2)(dobdc)(dobdc4-=2,5-dioxido-1,4-benzenedicarboxylate).The weak π-π stacking binding affinity toward C2H4 in TYUT-12 is clearly demonstrated through a combination of neutron powder diffraction measurements and theoretical calculations.Breakthrough experiments demonstrate that C2H4 can be directly obtained from binary,ternary,quaternary,and six-component light hydrocarbon mixtures with over 99.95％purity.
      原文链接:
    • 万方数据

    Development of Direct Reduced Iron in China:Challenges and Pathways

    Chengzhi WeiXin ZhangJin ZhangLiangping Xu...
    93-109页
    查看更多>>摘要：The steel industry is considered an important basic sector of the national economy,and its high energy consumption and carbon emissions make it a major contributor to climate change,especially in China.The majority of crude steel in China is produced via the energy-and carbon-intensive blast furnace-basic oxygen furnace(BF-BOF)route,which greatly relies on coking coal.In recent years,China's steel sector has made significant progress in energy conservation and emission reduction,driven by decarbonization policies and regulations.However,due to the huge output of crude steel,the steel sector still produces 15％of the total national CO2 emissions.The direct reduced iron(DRI)plus scrap-electric arc furnace(EAF)process is currently considered a good alternative to the conventional route as a means of reducing CO2 emissions and the steel industry's reliance on iron ore and coking coal,since the gas-based DRI plus scrap-EAF route is expected to be more promising than the coal-based one.Unfortunately,almost no DRI is produced in China,seriously restricting the development of the EAF route.Here,we highlight the chal-lenges and pathways of the future development of DRI,with a focus on China.In the short term,replacing natural gas with coke oven gas(COG)and byproduct gas from the integrated refining and chemical sector is a more economically feasible and cleaner way to develop a gas-based route in China.As the energy revolution proceeds,using fossil fuels in combination with carbon capture,utilization,and storage(CCUS)and hydrogen will be a good alternative due to the relatively low cost.In the long term,DRI is expected to be produced using 100％hydrogen from renewable energy.Both the development of deep processing technologies and the invention of a novel binder are required to prepare high-quality pellets for direct reduction(DR),and further research on the one-step gas-based process is necessary.
      原文链接:
    • 万方数据
    • 维普