Science China Technological Sciences最新文献_第8页

Rational design of robust and transparent superrepellent surfaces for long-term marine antifouling 合理设计用于长期海洋防污的坚固透明超级斥力表面

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-27 DOI: 10.1007/s11431-023-2700-8

Hui Chen, Zhi Wang, DaHeng Wang, Feng Xiao, Guang-En Fu, XueLing Bu, Lei Zhao, Tao Zhang, DaHeng Wu, JiBin Pu

{"title":"Rational design of robust and transparent superrepellent surfaces for long-term marine antifouling","authors":"Hui Chen, Zhi Wang, DaHeng Wang, Feng Xiao, Guang-En Fu, XueLing Bu, Lei Zhao, Tao Zhang, DaHeng Wu, JiBin Pu","doi":"10.1007/s11431-023-2700-8","DOIUrl":"https://doi.org/10.1007/s11431-023-2700-8","url":null,"abstract":"Superhydrophobic surfaces have demonstrated exceptional efficacy in combatting biofouling contaminations of optical devices and equipment in marine applications. However, the fabrication of highly transparent superhydrophobic materials remains a formidable challenge due to the inherent trade-off between surface roughness for superhydrophobicity and optical transparency. Herein, we design a robust and transparent superhydrophobic coating (Si-POSS) embedded silica nanoparticles (200 nm) with fluorinated polyhedral oligomeric silsesquioxanes (F-POSS) and zinc pyrithione (ZPT). The Si-POSS coating exhibits excellent water repellence toward diverse liquids and optical transmittance exceeding 90% in the visible spectrum. Moreover, the Si-POSS coating sustains long-term anti-bacterial (> 99.11%) and anti-algal effects for over 30 days, accompanied by mechanical, chemical, and thermal stability. This research asserts that the Si-POSS coating with outstanding combined characteristics holds significant potential for marine applications, particularly in self-cleaning and antifouling endeavors.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141576695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conductive edge-warping graphite mesas for robust structural superlubricity 实现坚固结构超润滑性的导电边缘翘曲石墨介质

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-27 DOI: 10.1007/s11431-024-2707-4

WeiJia Feng, Ying Liu, Ming Ma, DeLi Peng, JinHui Nie

{"title":"Conductive edge-warping graphite mesas for robust structural superlubricity","authors":"WeiJia Feng, Ying Liu, Ming Ma, DeLi Peng, JinHui Nie","doi":"10.1007/s11431-024-2707-4","DOIUrl":"https://doi.org/10.1007/s11431-024-2707-4","url":null,"abstract":"Structural superlubricity (SSL) refers to a state of ultralow friction and zero wear when two solid surfaces slide against each other. Recent investigations have identified amorphous carbon at the edge of the graphite mesa as the primary source of friction in such SSL systems. Here, the tensile stress of metal thin film is exploited to engineer vertically conductive edge-warping graphite mesas (EWGM). Through this approach, robust SSL performance is realized, demonstrated by sliding an 8 µm side length square EWGM on an atomically smooth Au substrate for 10000 cycles at a constant voltage of 1 mV. In this SSL system, differential friction coefficients lower than 1.5 × 10−4 are achieved, with static contact resistance between EWGM and Au substrate as low as 28 Ω and sliding contact resistance as low as 32 Ω. Moreover, the EWGM exhibits SSL behavior on polished Si wafer substrates. Furthermore, because of the no-edge contact with the substrate during sliding, friction is independent of the sliding speed of the EWGM. This study presents the first successful fabrication of conductive EWGM. Remarkably, in both EWGM-Au and EWGM-Si SSL systems, the measured frictions are more than one order of magnitude lower than those of ordinary self-retracting graphite mesas with no-edge warping, and no wear is observed during extended current-carrying sliding. Overall, these findings establish a solid groundwork for the future realization of macroscale conductive SSL systems.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lithography-free polarization-dependent absorber based on α-MoO3 基于 α-MoO3 的无光刻偏振相关吸收器

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-27 DOI: 10.1007/s11431-023-2627-1

Yang Hu, XiaoHu Wu, HongJu Li, Yi Zhao, HaoTuo Liu, XiuQuan Huang

{"title":"Lithography-free polarization-dependent absorber based on α-MoO3","authors":"Yang Hu, XiaoHu Wu, HongJu Li, Yi Zhao, HaoTuo Liu, XiuQuan Huang","doi":"10.1007/s11431-023-2627-1","DOIUrl":"https://doi.org/10.1007/s11431-023-2627-1","url":null,"abstract":"As a natural biaxial hyperbolic material, α-phase molybdenum trioxide (α-MoO3) exhibits dielectric and metallic properties in the plane, rendering it an exceptional candidate for polarization-dependent devices. In this work, we design a lithography-free polarization-dependent absorber consisting of an α-MoO3 film, a germanium layer, and a silver substrate. The results show that a narrowband absorption of up to 0.99 is achieved at a wavelength of 12.2 µm for transverse magnetic polarization. In contrast, the absorption is only 0.06 at this wavelength for transverse electric polarization. This remarkable polarization-dependent absorption performance is attributed to the coupling of epsilon-near-zero modes and Fabry-Perot resonances, which is confirmed by the electric field and power dissipation density distributions. Furthermore, strong polarization-dependent performance could also be achieved when the crystal axis of α-MoO3 is rotated in the out-of-plane. This work demonstrates that in-plane anisotropic α-MoO3 has the potential for designing high polarization-dependent devices.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research progress on rolling superlubricity in solid lubricants 固体润滑剂滚动超润滑性的研究进展

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-27 DOI: 10.1007/s11431-024-2671-8

PanPan Li, HongXuan Li, DongXiang Zhu, YongQi Zhu, FuYan Kang, Wan Wang, YaXin Zhang, XiaoHong Liu, Li Ji, HuiDi Zhou, JianMin Chen

引用次数: 0

Image attention transformer network for indoor 3D object detection 用于室内 3D 物体检测的图像注意变换器网络

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-26 DOI: 10.1007/s11431-023-2552-x

KeYan Ren, Tong Yan, ZhaoXin Hu, HongGui Han, YunLu Zhang

{"title":"Image attention transformer network for indoor 3D object detection","authors":"KeYan Ren, Tong Yan, ZhaoXin Hu, HongGui Han, YunLu Zhang","doi":"10.1007/s11431-023-2552-x","DOIUrl":"https://doi.org/10.1007/s11431-023-2552-x","url":null,"abstract":"Point clouds and RGB images are both critical data for 3D object detection. While recent multi-modal methods combine them directly and show remarkable performances, they ignore the distinct forms of these two types of data. For mitigating the influence of this intrinsic difference on performance, we propose a novel but effective fusion model named LI-Attention model, which takes both RGB features and point cloud features into consideration and assigns a weight to each RGB feature by attention mechanism. Furthermore, based on the LI-Attention model, we propose a 3D object detection method called image attention transformer network (IAT-Net) specialized for indoor RGB-D scene. Compared with previous work on multi-modal detection, IAT-Net fuses elaborate RGB features from 2D detection results with point cloud features in attention mechanism, meanwhile generates and refines 3D detection results with transformer model. Extensive experiments demonstrate that our approach outperforms state-of-the-art performance on two widely used benchmarks of indoor 3D object detection, SUN RGB-D and NYU Depth V2, while ablation studies have been provided to analyze the effect of each module. And the source code for the proposed IAT-Net is publicly available at https://github.com/wisper181/IAT-Net.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study of novel real-time power balance strategy with virtual asynchronous machine control for regional integrated electric-thermal energy systems 利用虚拟异步机控制区域综合电热能源系统的新型实时电力平衡策略研究

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-26 DOI: 10.1007/s11431-024-2659-1

Rui Wang, Ming-Jia Li, YiBo Wang, QiuYe Sun, PinJia Zhang

{"title":"A study of novel real-time power balance strategy with virtual asynchronous machine control for regional integrated electric-thermal energy systems","authors":"Rui Wang, Ming-Jia Li, YiBo Wang, QiuYe Sun, PinJia Zhang","doi":"10.1007/s11431-024-2659-1","DOIUrl":"https://doi.org/10.1007/s11431-024-2659-1","url":null,"abstract":"The development of regional integrated electric-thermal energy systems (RIETES) is considered a promising direction for modern energy supply systems. These systems provide a significant potential to enhance the comprehensive utilization and efficient management of energy resources. Therein, the real-time power balance between supply and demand has emerged as one pressing concern for system stability operation. However, current methods focus more on minute-level and hour-level power optimal scheduling methods applied in RIETES. To achieve real-time power balance, this paper proposes one virtual asynchronous machine (VAM) control using heat with large inertia and electricity with fast response speed. First, the coupling time-scale model is developed that considers the dynamic response time scales of both electric and thermal energy systems. Second, a real-time power balance strategy based on VAM control can be adopted to the load power variation and enhance the dynamic frequency response. Then, an adaptive inertia control method based on temperature variation is proposed, and the unified expression is further established. In addition, the small-signal stability of the proposed control strategy is validated. Finally, the effectiveness of this control strategy is confirmed through MATLAB/Simulink and HIL (Hardware-in-the-Loop) experiments.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Distributed swarm control for multi-robot systems inspired by shepherding behaviors 受牧羊行为启发的多机器人系统分布式蜂群控制

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-25 DOI: 10.1007/s11431-023-2651-6

GuiBin Sun, HaiBo Gu, JinHu Lü

{"title":"Distributed swarm control for multi-robot systems inspired by shepherding behaviors","authors":"GuiBin Sun, HaiBo Gu, JinHu Lü","doi":"10.1007/s11431-023-2651-6","DOIUrl":"https://doi.org/10.1007/s11431-023-2651-6","url":null,"abstract":"Swarming behaviors play an eminent role in both biological and engineering research, and show great potential applications in many emerging fields. Traditional swarming models still lack integrity, uniformity, and stability in swarm forming processes, resulting in fragmentation and void phenomena. Inspired by the shepherding behaviors observed in nature, we propose an integrated negotiation-control scheme for distributed swarm control of massive robots. The core idea of this scheme is that the robots at the boundary of the group herd the internal robots to form an equilibrium swarm. For this purpose, we introduce a concept of virtual group center towards which boundary robots herd internal robots. Then, a distributed negotiation mechanism is designed to allow each robot to negotiate the virtual group center only through local interactions with its neighbors. After that, we propose a shepherding-inspired swarm control law to drive a group of robots to form an integrated, uniform, and stable configuration from any initial states. Both numerical and flight simulations are presented to verify the effectiveness of our proposed swarm control scheme.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modifying Lyapunov exponent of chaotic map by self-cascading 通过自级联修改混沌图的李亚普诺夫指数

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-25 DOI: 10.1007/s11431-023-2543-1

ChenLong Yi, ChunBiao Li, YongXin Li, Ming Xia, ZhongYun Hua

引用次数: 0

Concept, configuration, and application of on-board nanogrids for use in electric vehicles 用于电动汽车的车载纳米网格的概念、配置和应用

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-25 DOI: 10.1007/s11431-023-2566-1

Bing Zhao, Yong Li, Fang Wu, JiangHu Wan, JiuQing Cai, HaiTao Yang, Fang Liu

{"title":"Concept, configuration, and application of on-board nanogrids for use in electric vehicles","authors":"Bing Zhao, Yong Li, Fang Wu, JiangHu Wan, JiuQing Cai, HaiTao Yang, Fang Liu","doi":"10.1007/s11431-023-2566-1","DOIUrl":"https://doi.org/10.1007/s11431-023-2566-1","url":null,"abstract":"Against the backdrop of increasingly serious climate change, researchers are attempting to extend macroscale carbon reduction research to smaller scales. With the rapid development and widespread application of electric vehicles (EVs), an effective approach for carbon reduction based on EVs has the potential to be developed. To coordinate and manage the EV platform in diverse application scenarios, the concept of an on-board nanogrid (OBNG), in which a nanogrid is combined with the EV, is proposed and defined, and the characteristics summarized. A configuration that includes a physical layer with the on-board hardware system; an information layer for logical control, energy management, and communication coordination; and an application layer that can cope with different working environments is proposed. A detailed introduction to the basic architecture and management mode of each layer is provided along with information concerning the relevant technologies for coordinated operation. New ideas and approaches to improve the existing performance are proposed, and finally, combined with a background of smart and low-carbon cities, major application scenarios are envisioned.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141512000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards experimental studying the airborne sound insulation of light frame walls with staggered studs 通过实验研究交错墙骨轻型框架墙的空气隔音性能

IF 4.6 2区工程技术

Science China Technological Sciences Pub Date : 2024-06-25 DOI: 10.1007/s11431-023-2662-7

YuCai Zhang, Kong Yue, YiFan Xie, XiangYu Cheng, XinLei Shi, Peng Wu, Hui Zhao

{"title":"Towards experimental studying the airborne sound insulation of light frame walls with staggered studs","authors":"YuCai Zhang, Kong Yue, YiFan Xie, XiangYu Cheng, XinLei Shi, Peng Wu, Hui Zhao","doi":"10.1007/s11431-023-2662-7","DOIUrl":"https://doi.org/10.1007/s11431-023-2662-7","url":null,"abstract":"Light frame walls (LFWs) serve as common partition walls in prefabricated buildings due to their lightweight nature, cost-effectiveness, energy efficiency, and adaptability for rapid on-site assembly. However, their acoustic insulation capability is hindered by issues such as sound bridges, resonance, and coincidence dips, resulting in inadequate sound insulation. This study aims to propose LFW designs with superior acoustic insulation suitable for practical engineering while meeting prevailing national standards. Nine full-scale LFW configurations were subjected to laboratory testing to evaluate the impact of staggered stud arrangements, stud types, and incorporation of compounded materials. The tests were performed between 100 and 5000 Hz, and the sound pressure level and reverberation time at 1/3 octave band were measured and used to calculate the weighted sound insulation index (Rw). Results demonstrated that the outlined design modifications significantly enhanced the sound insulation of the LFW. These modifications effectively mitigate the influence of sound bridges while addressing resonance and coincidence dips inherent in the wall system. Particularly noteworthy was the superior sound insulation achieved by staggered-stud LFWs with compounded materials, surpassing that of autoclaved lightweight concrete walls commonly used in prefabricated constructions despite having lesser thickness and surface density. Rw values increased from 43 to 54 dB compared to conventional LFWs, translating to a notable elevation in airborne sound insulation level from 4 to 7 as an internal separation component, meeting the requisite standards for most applications.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0