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Self-sensing intelligent microrobots for noninvasive and wireless monitoring systems

Microsystems & Nanoengineering 2023年第4期9卷 233-245页

作者： Zhongyi Li Kun Wang Chaojian Hou Chunyang Li Fanqing Zhang Wu ren Lixin Dong Jing Zhao School of Mechatronical Engineering Beijing Institute of Technology100081 BeijingChina Beijing Advanced Innovation Center for Intelligent Robots and Systems Beijing Institute of Technology100081 BeijingChina Department of Biomedical Engineering City University of Hong Kong999077 Kowloon TongHong KongChina School of Integrated Circuits and Electronics Beijing Institute of Technology100081 BeijingChina

Microrobots have garnered tremendous attention due to their small size,flexible movement,and potential for various in situ ***,functional modification of microrobots has become crucial for their interaction with the environment,except for precise motion ***,a novel artificial intelligence(AI)microrobot is designed that can respond to changes in the external environment without an onboard energy supply and transmit signals wirelessly in real *** AI microrobot can cooperate with external electromagnetic imaging equipment and enhance the local radiofrequency(RF)magnetic field to achieve a large penetration sensing depth and a high spatial *** working ranges are determined by the structure of the sensor circuit,and the corresponding enhancement effect can be modulated by the conductivity and permittivity of the surrounding environment,reaching~560 times at *** the control of an external magnetic field,the magnetic tail can actuate the microrobotic agent to move accurately,with great potential to realize in situ monitoring in different places in the human body,almost noninvasively,especially around potential diseases,which is of great significance for early disease discovery and accurate *** addition,the compatible fabrication process can produce swarms of functional *** findings highlight the feasibility of the self-sensing AI microrobots for the development of in situ diagnosis or even treatment according to sensing signals.

关键词： treatment precise conductivity

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Effect of Sb-site nonstoichiometry on the structure and microwave dielectric properties of Li_(3)Mg_(2)Sb_(1-x)O_(6) ceramics

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Journal of Advanced Ceramics 2020年第5期9卷 588-594页

作者： Cuijin PEI Jingjing TAN Yang LI Guoguang YAO Yanmin JIA Zhaoyu ren Peng LIU Huaiwu ZHANG School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China School of Physics Northwest UniversityXi’an 710069China College of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China

The non-stoichiometric Li_(3)Mg_(2)Sb_(1-x)O_(6)(0.05≤x≤0.125)compounds have been prepared via the mixed oxide *** influences of Sb nonstoichiometry on the sintering behavior,microstructure,phase composition along with microwave dielectric performances for Li_(3)Mg_(2)Sb_(1-x)O_(6) ceramics were *** with X-ray diffraction(XRD)and Raman spectra,it was confirmed that phase composition could not be affected by the Sb nonstoichiometry and almost pure phase Li_(3)Mg_(2)SbO_(6) was formed in all *** Sb-deficiency in Li_(3)Mg_(2)SbO_(6) not only lowered its sintering temperature but also remarkably improved its Q×f *** particular,non-stoichiometric Li_(3)Mg_(2)Sb_(0.9)O_(6) ceramics sintered at 1250℃/5 h owned seldom low dielectric constant ε_(r)=10.8,near-zero resonant frequency temperature coefficient τ_(f)=-8.0 ppm/℃,and high quality factor Q×f=86,300 GHz(at 10.4 GHz).This study provides an alternative approach to ameliorate its dielectric performances for Li_(3)Mg_(2)SbO_(6)-based compounds through defect-engineering.

关键词： microwave dielectric properties ceramics sintering antimony compounds

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Degradation of pyrene by immobilized microorganisms in saline-alkaline soil

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Journal of Environmental Sciences 2012年第9期24卷 1662-1669页

作者： Shanxian Wang Xiaojun Li Wan Liu Peijun Li Lingxue Kong Wenjie ren Haiyan Wu Ying Tu Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Centre for Material and Fiber Innovation Institute for Technology and Research Innovation Deakin University Geelong Vic 3217 Australia College of Resource and Environmental Engineering Liaoning Technical University Fuxin 123000 China

Biodegradation of polycyclic aromatic hydrocarbons （PAHs） is very difficult in saline-alkaline soil due to the inhibition of microbial growth under saline-alkaline stress. The microorganisms that can most effectively degrade PAHs were screened by introducing microorganisms immobilized on farm byproducts and assessing the validity of the immobilizing technique for PAHs degradation in pyrene-contaminated saline-alkaline soil. Among the microorganisms examined, it was found that Mycobacterium sp. B2 is the best, and can degrade 82.2% and 83.2% of pyrene for free and immobilized cells after 30 days of incubation. The immobilization technique could increase the degradation of pyrene significantly, especially for fungi. The degradation of pyrene by the immobilized microorganisms Mucor sp. F2, fungal consortium MF and co-cultures of MB＋MF was increased by 161.7% （P 〈 0.05）, 60.1% （P 〈 0.05） and 59.6% （P 〈 0.05） after 30 days, respectively, when compared with free F2, MF and MB＋ME Scanning electron micrographs of the immobilized microstructure proved the positive effects of the immobilized microbial technique on pyrene remediation in saline- alkaline soil, as the interspace of the carder material structure was relatively large, providing enough space for cell growth. Co-cultures of different bacterial and fungal species showed different abilities to degrade PAHs. The present study suggests that Mycobacterium sp. B2 can be employed for in situ bioremediation of PAHs in saline-alkaline soil, and immobilization of fungi on farm byproducts and nutrients as carriers will enhance fungus PAil-degradation ability in saline-alkaline soil.

关键词： saline-alkaline soil immobilization PAHs-degrading microorganisms biodegradation characteristics Mycobacterium

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髓内与髓外固定股骨颈基底部骨折的有限元分析:PFNA与FNS

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中国组织工程研究 2025年第21期29卷 4407-4412页

作者：覃祺阿里木江·玉素甫刘宇哲刘修信任政冉建新疆医科大学新疆维吾尔自治区乌鲁木齐市830054 新疆医科大学第六附属医院新疆维吾尔自治区乌鲁木齐市830092

背景:股骨颈基底部骨折生物力学稳定性差,治疗方案与传统股骨颈骨折有所差别,目前临床上治疗青年股骨颈基底部骨折的手术方案仍未达成统一。目的:通过有限元分析比较股骨近端防旋髓内钉与股骨颈动力交叉钉治疗股骨颈基底部骨折的生物力... 详细信息

背景:股骨颈基底部骨折生物力学稳定性差,治疗方案与传统股骨颈骨折有所差别,目前临床上治疗青年股骨颈基底部骨折的手术方案仍未达成统一。目的:通过有限元分析比较股骨近端防旋髓内钉与股骨颈动力交叉钉治疗股骨颈基底部骨折的生物力学特征。方法:首先使用Mimics Medical 21.0软件提取健康青年女性志愿者右侧股骨CT数据建立初步模型;然后将该模型导入Geomagic Wrap 2021软件进一步光滑处理;利用SOLIDWORKS 2021软件建立股骨颈基底部骨折模型、股骨近端防旋髓内钉模型、股骨颈动力交叉钉模型并进行装配;最后将装配后的模型导入Workbench 2021 R1软件进行生物力学分析。结果与结论:(1)应力分布:股骨近端防旋髓内钉组股骨模型应力分布主要在骨折线附近及股骨内侧,应力峰值为151.90 MPa;股骨颈动力交叉钉组股骨模型应力分布主要在骨折线附近,应力峰值为290.74 MPa;股骨近端防旋髓内钉内固定应力主要分布在螺旋刀片及主钉近端,应力峰值为102.95 MPa;股骨颈动力交叉钉内固定应力分布主要由支撑棒向两边延伸,应力峰值为184.69 MPa;(2)总位移:股骨近端防旋髓内钉组股骨模型最大位移为4.032 3 mm,股骨颈动力交叉钉组股骨模型最大位移为4.648 9 mm,最大位移均位于股骨头;股骨近端防旋髓内钉组内固定与股骨颈动力交叉钉组内固定位移峰值分别为2.709 4 mm与3.130 3 mm,两组内固定位移均主要集中在内固定近端,逐渐向远端递减;(3)提示在股骨颈基底部骨折的模型中,无论是股骨模型还是内固定模型,股骨近端防旋髓内钉相较于股骨颈动力交叉钉应力分布更分散、应力峰值更低、股骨头位移更小,生物力学稳定性更优。

关键词：股骨颈基底部骨折有限元分析股骨近端防旋髓内钉股骨颈动力交叉钉系统生物力学

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Design and implementation of self-protection agent for network-based intrusion detection system

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Journal of Central South University of Technology 2003年第1期10卷 69-73页

作者： ZHU Shu-ren(朱树人) LI Wei-qin(李伟琴) Changsha University of Electric Power Changsha 410077 China Beijing University of Aeronautics and Astronautics Beijing 100083 China Beijing University of Aeronautics and Astronautics Beijing 100083 China

Static secure techniques, such as firewall, hierarchy filtering, distributed disposing,layer management, autonomy agent, secure communication, were introduced in distributed intrusion detection. The self-protection agents were designed, which have the distributed architecture,cooperate with the agents in intrusion detection in a loose-coupled manner, protect the security of intrusion detection system, and respond to the intrusion actively. A prototype self-protection agent was implemented by using the packet filter in operation system kernel. The results show that all the hosts with the part of network-based intrusion detection system and the whole intrusion detection system are invisible from the outside and network scanning, and cannot apperceive the existence of network-based intrusion detection system. The communication between every part is secure. In the low layer, the packet streams are controlled to avoid the buffer leaks exist ing in some system service process and back-door programs, so as to prevent users from misusing and vicious attack like Trojan Horse effectively.

关键词： intrusion detection system (IDS) network-based intrusion detection system(NIDS) self-protection agent IP filter

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Numerical Simulation of Sea Ice and Structure Interaction Using Common Node DEM-SPH Model

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China Ocean Engineering 2023年第6期37卷 897-911页

作者： SHEN Zhong-xiang WANG Wen-qing XU Cheng-yue LI Hong-bin JIANG Yin LIU ren-wei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

In this work,a novel fluid-structure coupling method called the common node discrete element-smoothed particle hydrodynamics(DS-SPH)method is *** framework combines the principles of the common node discrete element method(DEM)and smoothed particle hydrodynamics(SPH)to construct DEM-SPH particles situated on the same *** doing so,the DEM particles can interact with the SPH particles within their support domain,enabling fluid-structure interaction(FSI).To determine the DEM microscopic parameters required for this method,uniaxial compression and three-point bending tests are conducted on sea *** verify the proposed model,we select the interaction between sea ice and structures as a case *** simulation,the model's capability of accurately depicting sea ice deformation and fracture has been *** results indicate that the inclusion of SPH particles with fluid properties in the DEM model has minimal impact on the main mechanical parameters of sea ***,it helps prevent the occurrence of particle splashing during cement ***,it is observed that the size of DEM particles and the friction between DEM particles and the structure significantly influence the macroscopic mechanical behavior of the common-node DEM-SPH ***,we compare the fracture behavior of sea ice and the ice forces acting on structures obtained from the current model with on-site measured *** agreement between the two sets of data is excellent,further validating the effectiveness of the proposed model in practical applications.

关键词： common node DEM-SPH uniaxial compression three-point bending structure-ice interaction

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Multi-Image Restoration Method Combined with Total Generalized Variation and l_p-Norm Regularizations

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Journal of Shanghai Jiaotong university(Science) 2019年第5期24卷 551-558页

作者： ren Xuanguang PAN Han JING Zhongliang GAO Lei School of Aeronautics and Astronautics Shanghai Jiao Tong University Science and Technology on Avionics Integration Laboratory Shanghai Jiao Tong University

Image restoration is an important part of various applications, such as computer vision, robotics and remote sensing. However, recovering the underlying structures of the latent image contained in multi-image is a challenging problem because of the need to develop robust and fast algorithms. In this paper, a novel problem formulation for multi-image restoration problem is proposed. This novel formulation is composed of multi-data fidelity terms and a composite regularizer. The proposed regularizer consists of total generalized variation(TGV)and lp-norm. This multi-regularization method can simultaneously exploit the consistence of image pixels and promote the sparsity of natural signals. To deal with the resulting problem, we derive and implement the solution using alternating direction method of multipliers(ADMM). The effectiveness of our method is illustrated through extensive experiments on multi-image denoising and inpainting. Numerical results show that the proposed method is more efficient than competing algorithms, achieving better restoration performance.

关键词： image restoration multi-regularization multi-image convex optimization

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Interfacial bonding mechanism of Cu/Al composite plate produced by corrugated cold roll bonding

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Rare Metals 2021年第5期40卷 1284-1293页

作者： Tao Wang Xiang-Yu Gao Zhi-Xiong Zhang Zhong-Kai ren Yan-Yang Qi Jing-Wei Zhao College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Engineering Research Center for Metal Composites Forming Process and Equipment Taiyuan University of TechnologyTaiyuan 030024China TYUT-UOW Joint Research Center Taiyuan University of TechnologyTaiyuan 030024China

Corrugated cold roll bonding(CCRB) produces metal composite plate with improved mechanical properties compared with conventional methods,but the interfacial mechanism is not fully ***,Cu/Al composite plate with good plate shape was produced by CCRB,and the bonding mechanism and strength along the corrugated interface were studied by experiments and finite element *** results showed that the average bonding strength of Cu/Al composite plate produced by CCRB was nearly twice that of conventional composite plate at an average reduction of 40% during *** friction shear stresses occurred at the interface of the corrugated composite plate,which promoted the plastic deformation of the metals and accelerated the rupture of the brittle interfacial *** backscattered diffraction analysis showed that higher degrees of grain elongation and refinement occurred in the matrices at the front waist and trough due to the stronger normal and shear ***-dispersive spectroscopy line scans showed that the thickest atomic diffusion layer occurred at the front *** present combination of experimental and computational analyses provides insights into the underlying mechanism of mechanically improved metal composites prepared by CCRB.

关键词： Corrugated cold roll bonding Cu/Al composite Bonding strength Friction shear stress Grain refinement Atomic diffusion layer

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Coastal wetland hyperspectral classification under the collaborative of subspace partition and infinite probabilistic latent graph ranking

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Science China(Technological Sciences) 2022年第4期65卷 759-777页

作者： HU YaBin ren GuangBo MA Yi YANG JunFang WANG JianBu AN JuBai LIANG Jian MA YuanQing SONG XiuKai First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Technology Innovation Center for Ocean Telemetry Ministry of Natural ResourcesQingdao 266061China College of Oceanography and Space Informatics China University of PetroleumQingdao 266580China Information Science and Technology College Dalian Maritime UniversityDalian 116026China Nantong Academy of Intelligent Sensing Nantong 226001China Shandong Marine Resources and Environment Research Institute Yantai 264006China

The abundance of spectral information provided by hyperspectral imagery offers great benefits for many ***,processing such high-dimensional data volumes is a challenge because there may be redundant bands owing to the high interband *** study aimed to reduce the possibility of“dimension disaster”in the classification of coastal wetlands using hyperspectral images with limited training *** study developed a hyperspectral classification algorithm for coastal wetlands using a combination of subspace partitioning and infinite probabilistic latent graph ranking in a random patch network(the SSP-IPLGR-RPnet model).The SSP-IPLGR-RPnet approach applied SSP techniques and an IPLGR algorithm to reduce the dimensions of hyperspectral *** RPnet model overcame the problem of dimension disaster caused by the mismatch between the dimensionality of hyperspectral bands and the small number of training *** results showed that the proposed algorithm had a better classification performance and was more robust with limited training data compared with that of several other state-of-the-art *** overall accuracy was nearly 4%higher on average compared with that of multi-kernel SVM and RF *** with the EMAP algorithm,MSTV algorithm,ERF algorithm,ERW algorithm,RMKL algorithm and 3D-CNN algorithm,the SSP-IPLGR-RPnet algorithm provided a better classification performance in a shorter time.

关键词： coastal wetland hyperspectral image dimensionality reduction classification limited training data

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Composition evolution and deformation of different non-metallic inclusions in a bearing steel during hot rolling

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Journal of Iron and Steel Research International 2022年第4期29卷 552-562页

作者： Nan Liu Gong Cheng Li-feng Zhang Wen Yang Ying ren Guo-cheng Wang Xiao-ming Liu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Steelmaking Plant Baotou Steel Union Co.Ltd.Baotou 014010Inner MongoliaChina Engineering Technology Co. Ltd.WISDRI Engineering and Research Incorporation LimitedWuhan 430223HubeiChina School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

The composition evolution and deformation of different non-metallic inclusions in a bearing steel during hot rolling were investigated by the automatic detection and the improved non-aqueous electrolysis *** sulfide,MnS–TiN,and liquid CaO–Al_(2)O_(3) inclusions were elongated while TiN and MgO-Al_(2)O_(3) were fractured during hot *** CaS–MnS phase in the MgO–Al_(2)O_(3)–CaS–MnS inclusion was separated from the inclusion,leading to the formation of CaS–MnS type ***,the CaS and MnS contents in oxide-containing inclusions decreased while the MgO and Al_(2)O_(3) contents increased after hot *** deformability of different inclusions in the bearing steel was quantitatively compared and discussed.

关键词： Bearing steel Hot rolling Composition evolution Deformability Inclusion

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