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Mechanical design,modeling,and identification for a novel antagonistic variable stiffness dexterous finger

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Frontiers of Mechanical Engineering 2022年第3期17卷 59-74页

作者： Handong HU Yiwei LIU Zongwu XIE Jianfeng YAO hong LIU State Key laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

This study traces the development of dexterous hand research and proposes a novel antagonistic variable stiffness dexterous finger mechanism to improve the safety of dexterous hand in unpredictable environments,such as unstructured or man-made operational errors through comprehensive consideration of cost,accuracy,manufacturing,and *** on the concept of mechanical passive compliance,which is widely implemented in robots for interactions,a finger is dedicated to improving mechanical *** finger mechanism not only achieves passive compliance against physical impacts,but also implements the variable stiffness actuator principle in a compact finger without adding supererogatory *** achieves finger stiffness adjustability according to the biologically inspired stiffness variation principle of discarding some mobilities to adjust *** mechanical design of the finger and its stiffness adjusting methods are *** stiffness characteristics of the finger joint and the actuation unit are *** results of the finger joint stiffness identification and finger impact tests under different finger stiffness presets are provided to verify the validity of the *** have been experimentally proven to be robust against physical ***,the experimental part verifies that fingers have good power,grasping,and manipulation performance.

关键词： multifingered hand mechanism design robot safety variable stiffness actuator

Contraction of Heat Shock Protein 70 Genes Uncovers Heat Adaptability of Ostrea denselamellosa

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Journal of Ocean University of China 2023年第6期22卷 1669-1676页

作者： DONG Zhen LIU Shikai YU hong KONG Lingfeng LI Qi Key laboratory of Mariculture Ministry of EducationOcean University of ChinaQingdao 266003China

The milin oyster Ostrea denselamellosa is a live-bearing species with a sharp decline in the natural *** other oysters,*** lives in the subtidal zone and its adaptability to heat,salinity,*** different from most other *** shock proteins 70(HSP70)are a family of conserved ubiquitously expressed heat shock proteins which are produced in re-sponse to stressful conditions,especially *** this study,we identified Hsp70 genes through bioinformatic analysis in five species of *** them,*** holds the fewest number of Hsp70 genes,which may be one of the reasons why ***-selamellosa cannot tolerate high *** conserved motifs and gene structures of Hsp70B2 sub-family and other types of Hsp70 in *** were different from that of Hspa12 sub-family,which may be due to performing necessary multiple phy-siological *** profile analysis for Hsp70 genes of *** indicated that gills play an important role in responding to multiple external *** addition,synteny analysis of Hsp70 genes among ***,*** and Cras-sostrea ariakensis showed that Hsp70 genes in genus of Ostrea genome might have evolved from a common ancestor with genus of *** short,our results lay the foundation for further investigation of the evolution of *** Hsp70 genes and heat adaptability.

关键词： Ostrea denselamellosa oysters Hsp70 heat adaptability

An efficient inverse approach for reconstructing time-and space-dependent heat flux of participating medium

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Chinese Physics B 2020年第11期29卷 164-173页

作者： Shuang-Cheng Sun Guang-Jun Wang hong Chen School of Energy and Power Engineering Chongqing UniversityChongqing 400044China Key laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of EducationChongqing UniversityChongqing 400044China

The decentralized fuzzy inference method(DFIM)is employed as an optimization technique to reconstruct time-and space-dependent heat flux of two-dimensional(2D)participating *** forward coupled radiative and conductive heat transfer problem is solved by a combination of finite volume method and discrete ordinate *** reconstruction task is formulated as an inverse problem,and the DFIM is used to reconstruct the unknown heat *** prior information on the heat flux distribution is required for the inverse *** retrieval results illustrate that the time-and spacedependent heat flux of participating medium can be exactly recovered by the *** present method is proved to be more efficient and accurate than other optimization *** effects of heat flux form,initial guess,medium property,and measurement error on reconstruction results are *** results indicate that the DFIM is robust to reconstruct different kinds of heat fluxes even with noisy data.

关键词： decentralized fuzzy inference surface heat flux reconstruction inverse heat transfer problem participating medium

Privacy preserving divisible double auction with a hybridized TEE‑blockchain system

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Cybersecurity 2021年第1期4卷 580-593页

作者： Bingyu Liu Shangyu Xie Yuanzhou Yang Rujia Wang Yuan hong Illinois Institute of Technology 10 West 35th StreetChicagoIL 60616USA

Double auction mechanisms have been designed to trade a variety of divisible resources(e.g.,electricity,mobile data,and cloud resources)among distributed *** such divisible double auction,all the agents(both buyers and sellers)are expected to submit their bid profiles,and dynamically achieve the best *** practice,these agents may not trust each other without a market ***,smart contract is extensively used to ensure digital agreement among mutually distrustful *** consensus protocol helps the smart contract execution on the blockchain to ensure strong integrity and ***,severe privacy risks would emerge in the divisible double auction since all the agents should disclose their sensitive data such as the bid profiles(i.e.,bid amount and prices in different iterations)to other agents for resource allocation and such data are replicated on all the nodes in the ***,the consensus requirements will bring a huge burden for the blockchain,which impacts the overall *** address these concerns,we propose a hybridized TEE-Blockchain system(system and auction mechanism co-design)to privately execute the divisible double *** designed hybridized system ensures privacy,honesty and high efficiency among distributed *** bid profiles are sealed for optimally allocating divisible resources while ensuring truthfulness with a Nash ***,we conduct experiments and empirical studies to validate the system and auction performance using two real-world applications.

关键词： Privacy Truthfulness Blockchain Smart contract TEE Auction design

Energy-efficient performance of cooperative relay network with joint sensing-transmission time duration and power allocation

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The Journal of China Universities of Posts and Telecommunications 2012年第5期19卷 32-38页

作者： ZHANG Guo-yi WANG Yong XU Jian LUO Hui-hong Power Control Center of China Southern Power Grid Guangzhou 510623China

A joint optimal sensing-transmission time duration and power allocation scheme has been proposed to maximize the energy efficiency for cooperative relay network. In particular, observing that the spectrum sensing and data transmission time duration lies within a strict interval, the joint optimal solutions of our proposed scheme are achieved by sequential optimization method. Numerical evaluation results reveal that the relay-assisted transmission using our proposed scheme significantly outperforms the non-relay transmission in terms of the network energy-efficiency.

关键词： energy efficiency cooperative relay network spectrum sensing data transmission power allocation

Improvement of oxidation resistance of Nb–Ti–Si based alloys with additions of Al, Cr and B at different temperatures

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Progress in Natural Science:Materials International 2021年第3期31卷 442-453页

作者： Guangxin Sun Lina Jia Zhen hong Guangxu Liu Hu Zhang School of Materials Science and Engineering Beihang University

The effects of Cr,Al and B addition on the microstructure and high-temperature oxidation behaviors（at 1200,1250 and 1300℃） of Nb-Ti-Si based alloys were *** results showed that the addition of Cr stabilized α-Nb5Si3,while Al promoted the formation of β-Nb5Si3and adding B promoted the formation of γ-*** the three elements,Al and Cr were beneficial to oxidation resistance at 1200℃,and B was favorable to the oxidation resistance at 1300 ℃.At 1250 ℃,Al and B had the same effects on the improvement of oxidation *** ratio of these alloying elements might play an important role in enhancing oxidation *** oxidation resistance of the three kinds of silicides was compared,and the sequence was:γ-Nb5Si3> β-Nb5Si3>α-*** predict the effects of the investigated alloying elements on the oxidation resistance of Nb-Ti-Si based alloys in a wider range of concentration,an artificial neural network（ANN） model was established,showing excellent accuracy and generalization *** the instructions of the ANN model,the oxidation resistance can be optimized with less additions of alloying elements.

关键词： Nb–Ti–Si alloys Alloying Oxidation resistance Artificial neural network

Novel Cellulase Profile of Trichoderma reesei Strains Constructed by cbh1 Gene Replacement with eg3 Gene Expression Cassette

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Acta Biochimica et Biophysica Sinica 2004年第10期36卷 667-672页

作者： Tian-hong WANG*, Ti LIU, Zhi-hong WU, Shi-Li LIU, Yi LU, and Yin-Bo QU The State Key laboratory of Microbial Technology, Shandong University, Jinan 250100, China The State Key laboratory of Microbial Technology Shandong University

To construct strains of the filamentous fungus Trichoderma reesei with low cellobiohydrolases while high endoglucanase activity, the Pcbh1-eg3-Tcbh1 cassette was constructed and the coding sequence of the cellobiohydrolase I (CBHI) gene was replaced with the coding sequence of the eg3 gene by homologous recombination. Disruption of the cbh1 gene was confirmed by PCR, Southern dot blot and Western hybri- dization analysis in two transformants denoted as L13 and L29. The filter paper-hydrolyzing activity of strain L29 was 60% of the parent strain Rut C30, and the CMCase activity was increased by 33%. This relatively modest increase suggested that the eg3 cDNA under the control of the cbh1 promoter was not efficiently transcribed as the wild type cbhl gene. However our results confirmed that homologous recombination could be used to construct strains of the filamentous fungus Trichoderma reesei with novel cellulase profile. Such strains are of interest from the basic science perspective and also have potential industrial applications.

关键词： Trichoderma reesei gene replacement gene disruption cbh1 eg3

Polyphosphoester-modified Cellulose Nanocrystals for Stabilizing Pickering Emulsion Polymerization of Styrene

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Chinese Journal of Polymer Science 2020年第9期38卷 921-931,I0005页

作者： Kun-Ming Che Ming-Zu Zhang Jin-Lin He Pei-hong Ni College of Chemistry Chemical Engineering and Materials ScienceState and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsJiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisSoochow UniversitySuzhou 215123China

The structure and properties of functional nanoparticles are important for stabilizing Pickering emulsion ***,cellulose nanocrystals(CNCs)are increasingly favored as a bio-based stabilizer for Pickering *** this study,we reported a novel functionalized polyphosphoester-grafted CNCs for the stabilization of oil-in-water Pickering emulsions and the emulsion polymerization of ***,polyphosphoester containing an amino group at one end of the chain,abbreviated as PBYP-NH2,was prepared by ring-opening polymerization(ROP)and hydrolysis reaction,wherein PBYP represents poly[2-(but-3-yn-1-yloxy)-2-oxo-1,3,2-dioxaphospholane].Subsequently,CNC-COOH was obtained via 2,2,6,6-tetramethylpiperidine-1-oxyl(TEMPO)oxidation of *** functionalized nanocrystals CNC-PBYP-COOH with carboxyl groups and polyphosphoester on the surface were obtained by the amidation reaction of PBYP-NH2 with ***,we used CNC-PBYP-COOH as sole particle emulsifiers to stabilize styrene-in-water Pickering emulsions and studied its effects on the emulsions in details by using dynamic light scattering(DLS).The results indicated that the properties of these emulsions depended on the concentration of hydrophobically modified CNCs,volume ratios of oil to water,and pH *** modified CNCs had higher ability to stabilize the styrene-in-water emulsions relative to the unmodified CNCs,and a stable oil-in-water(o/w)Pickering emulsion with diameter of hundreds of nanometers could be *** resulting emulsions could be polymerized to yield nanosized *** polyphosphoester-modified CNCs as green particle emulsifiers can efficiently stabilize nanoemulsions and latexes,which would promote the development of novel environmentally friendly materials.

关键词： Cellulose nanocrystals(CNCs) Polyphosphoesters(PPEs) Pickering emulsion Emulsion polymerization

Microplastics in Surface Waters and Floodplain Sediments of the Dagu River in the Jiaodong Peninsula,China

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Journal of Ocean University of China 2022年第6期21卷 1538-1548页

作者： JIAO Jie CHEN Gang YANG Zechuan LI Zhengyan HU hong College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China College of Marine Life Science Ocean University of ChinaQingdao 266100China

To understand the pollution characteristics and distributions of microplastics in the Dagu River,an important inland river that flows to Jiaozhou Bay,the abundance,particle size,shape,color,and polymer type of microplastics in the surface waters and floodplain sediments were *** results showed that the abundance of microplastics in the surface waters varied between 0.68 and 3.96 items L^(−1).The abundance of microplastics in the floodplain sediments varied between 115.5 and 495 items kg^(−1).The distribution of microplastics in the river has obvious characteristics:1)The abundance of microplastics downstream was significantly higher than that upstream.2)The abundance of microplastics decreased significantly in the estuary.3)The abundance of microplastics was higher in densely populated areas.4)Factors such as effluent discharge from sewage treatment plants and inflow of tributaries affect the abundance of microplastics in *** main polymer types of microplastics were polypropylene(PP),polyethylene(PE),and polyvinyl chloride(PVC).Both the abundance and polymer types of microplastics show a positive correlation between the surface waters and floodplain sediment samples,indicating that the microplastics in surface waters and floodplain sediments come from the same *** present study demonstrates that the abundance,distribution,and sources of microplastics might be affected by geology,hydrogeology,land use types,and anthropogenic *** study provides basic data for the study of microplastics in rivers and provides a reference for the establishment of microplastic control measures.

关键词： microplastics surface water floodplain sediment distribution Dagu River