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Versatile Recyclable Kevlar Nanofibrous Aerogels Enabled by Destabilizing dynamic balance Strategy

Advanced Fiber Materials 2023年第3期5卷 1050-1062页

作者： Lishan Li Jing Lyu Qingqing Cheng Chen Fu Xuetong Zhang Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123People’s Republic of China Division of Surgery and Interventional Science University College LondonLondon NW32PFUK

Aerogels are of great interest in diverse fields including thermal insulation,environmental protection,liquid separation,electromagnetic shielding,***,the development of renewable and recyclable aerogels,especially synthetic pol-ymer-based ones,remains an enormous challenge,which seriously hinders the practical application of ***,utilizing Kevlar nanofibers(KNFs)as representative synthetic polymer building blocks,a destabilizing dynamic balance(DDB)strategy is proposed to fabricate recyclable aerogels with high reprocessing *** specifically,aprotic esters(e.g.,di-tert-butyl decarbonate,DiBoc)and alkalis(e.g.,potassium tert-butoxide,t-BuOK)are introduced to trigger the destabilizing dynamic balance between deprotonation–protonation of KNFs,resulting in a reversible sol–gel ***,the duration of sol–gel transition(i.e.,gelation)time,adjustable from 10^(–2)to 10^(3)min,is compatible with versatile processing methods,such as static mould casting,dynamic wet spinning,dynamic blade coating and dynamic 3D *** unique advantages enable the fabrication of various KNF aerogel products(i.e.,continuous fibers,continuous films,large-sized monoliths and 3D-printed articles)with low density(33–165 mg/cm3),high compressive modulus(up to 52 MPa),high specific surface area(360–404 m^(2)/g)and low thermal conductivity(0.027–0.050 W/m·K).Notably,these properties are comparable or superior to that of previously reported KNF aerogels and far superior to that of recyclable *** with direct fabrication from raw materials,the DDB strategy reduces the cost by 50.5%and 82.5%when products are made from recycled aerogels and wet gels,*** cost reduction further increases with the number of recycling cycles,which is calculated as$275 per kilogram KNF aerogel with 5 *** work develops extraordinary KNF aerogels those can be recycled and reused,as well as provides a strategy that can be applied to design mor

关键词： Aerogel Kevlar Recyclability Versatile processing dynamic balance

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Drum of CTP Device dynamic balance Based on Theory of Wavelet Transform

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International Journal of Plant Engineering and Management 2014年第2期19卷 122-128页

作者： HU Zhi-wei TANG Yong LI Li-li KODAK Electronic Products ( Shanghai) Co. Ltd

Conclusion is that the soft threshold de-noising effect is better than hard threshold de-noising though the signal to noise ratio and Root Mean Square error. After analyzing, de-noising and reconstructing signal through wavelet packet from Matlab software, the average value of peak extracted from signal reconstruction is gotten to provide data for dynamic balance. Making use of the influence coefficient method to adjust drum of CTP dynamic balance, the program of Matlab is used to find phase position and weight of the mass block quickly, which can provide evidence for software for dynamic balance developed.

关键词： wavelet transform de-noise influence coefficient method dynamic balance drum Matlab CTP

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Optimization of SLHMS Based on dynamic balance of Mechanical and Electronic Spindle

Optimization of SLHMS Based on Dynamic Balance of Mechanical...

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第30届中国控制与决策会议

作者： Jinxiang Pian Jiefeng Zhi Nan Hu Guohui Wang Simiao Yu School of Information and Control Engineering Shenyang Jianzhu University

Mechanical spindle is an important component in the machining process, and it often produce an oscillation in the process of high-speed operation, making its spindle deviate from its geometric center, so that it would seriously affect the processing accuracy in the industrial process, thus affecting the stability of the entire system. At present, some dynamic balancing methods are difficult to establish model and have low control precision. Aiming at the above problem, this paper applies the harmony search algorithm to establish the model of the amplitude of the mechanical spindle vibration to search the optimal solution, ultimately search for the vibration deviation of the A and B balance blocks in the mechanical spindle. The harmony search algorithm can significantly improve the search speed because of its simple structure, less adjustable parameters and easy implementation, but the convergence effect is not ideal. Based on the harmony search, the improved self-learning particle swarm(SLPSO) algorithm is used to improve its convergence rate, and to avoid falling into the local optimal. The experimental results verify the feasibility and compared with the actual average, vibration accuracy respectively improves 7.316%, 6.741% and 3.476%.

关键词： Mechanical spindle dynamic balance Harmony search self-learning particle group(SLPSO)

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Application and Research of GeoXH Handset in the Checking of Arable dynamic balance

Application and Research of GeoXH Handset in the Checking of...

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第二届中国卫星导航学术年会

作者： Wang Peixian~1,Zhang Guihao~1,Zhao Li~1 1.Liaoning Technical University,Fuxin,Liaoning,China,123000

＜正＞The arable dynamic balance is a system of basic farmland protection in new《Land Management Law》.The traditional method is based on present situation map and completion drawing that were completed in paper maps and so on,using conventional tools complete land of dynamic balance review,With positioning difficult,measurement difficult,record difficulty disadvantages and inner calculation is not easy,*** on the theory of H-Star technology of Trimble GeoXH handset and concrete work practice in Liaoning province,the paper describes the application of the Trimble GeoXH handset and procedure into the process of dynamic balance projects in LiaoNing *** sophistication of H-Star technical makes the use of Trimble GeoXH handset in dynamic balance has significant advantages:Easy to carry and Field operation simple make field personnel can get high precision positioning in a very short time,reducing labor intensity, shorting field work time,obviously improving the efficiency of field work;According to actual conditions,we evaluate the positioning accuracy of Trimble GeoXH handset,It’s far to meet the requirements of surveying technology in the checking of dynamic balance of arable;Using written calculation procedure greatly improves the computational efficiency of office work,operation time greatly curtailed In office *** using of both make dynamic balance project greatly improved efficiency of office work and field work,Not only meet the requirements of surveying technology in checking of dynamic balance,But also for formulating unified《surveying standard in the checking of arable dynamic balance》provide a reference.

关键词： Trimble GeoXH handset H-Star technology procedures dynamic balance efficiency

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dynamic balance in Children With Trisomy 21:A Pilot Study

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Psychology Research 2020年第7期10卷 285-288页

作者： David Catela Ana Paula Seabra Bernardo Matias Miguel Nunes Pedro Neves Samuel Rodrigues Higher School of Sports Sciences of Rio Maior Polytechnique Institute of SantarémSantarémPortugal Life Quality Research Centre(CIEQV) Rio MaiorPortugal Research Unity of the Polytechnique Institute of Santarém SantarémPortugal

At age 5,children with trisomy 21 have roughly 2 years of delayed motor *** aimed to verify if children with trisomy 21(AD)(N=6,7.67±1.51 years)had a similar performance to children with a typical development(TD)(N=37,5.19±0.40 years old),in a playful motor action(to spin on herself until she cannot get more).On average,ADs gave less laps,for less time,spending more time per rotation,but without significant *** the AD,one-third fell and rose to continue to spin;one-third stopped and resumed spinning(with intervals of 2.05±0.86s).Three ADs performed the action counterclockwise and the other three in clockwise *** results support the hypothesis that AD can perform the activity of spinning,with DT(significantly)younger,allowing to AD momentary pauses and conditions for their physical security.

关键词： children dynamic balance motor development trisomy 21

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Adaptive delay-energy balanced partial offloading strategy in Mobile Edge Computing networks

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Digital Communications and Networks 2023年第6期9卷 1310-1318页

作者： Shumei Liu Yao Yu Lei Guo Phee Lep Yeoh Branka Vucetic Yonghui Li School of Computer Science and Engineering Northeastern UniversityShenyang110819China Key Laboratory of Intelligent Computing in Medical Image Ministry of EducationNortheastern UniversityShenyang110819China School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China School of Electrical and Information Engineering University of SydneySydneyNSW2006Australia

Mobile Edge Computing(MEC)-based computation offloading is a promising application paradigm for serving large numbers of users with various delay and energy *** this paper,we propose a flexible MECbased requirement-adaptive partial offloading model to accommodate each user's specific preference regarding delay and energy *** address the dimensional differences between time and energy,we introduce two normalized parameters and then derive the computational overhead of processing *** from existing works,this paper considers practical variations in the user request patterns,and exploits a flexible partial offloading mode to minimize computation overheads subject to tolerable delay,task workload and power *** the resulting problem is non-convex,we decouple it into two convex subproblems and present an iterative algorithm to obtain a feasible offloading *** experiments show that our proposed scheme achieves a significant improvement in computation overheads compared with existing schemes.

关键词： Mobile edge computing(MEC) Delay Energy consumption dynamic balance Partial computation offloading

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Simulation of welding of 2A12-T4 aluminum alloy by different yield stress models

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China Welding 2010年第3期19卷 74-78页

作者：闫德俊刘雪松杨建国李海龙方洪渊 State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001.

To investigate the effects of strain hardening, strain softening and dynamic balance behaviors of 2A12-T4 aluminum alloy on the welding residual plastic strain and residual stresses, the true stress-true strain curves at different temperature of certain material were used in the FEM modeling process. The simulation results show that little influence on the welding residual plastic strain and residual stresses was found as the strain hardening, strain softening and dynamic balance worked together.

关键词： strain hardening strain softening dynamic balance welding residual stress

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Relationship of proprioception,cutaneous sensitivity,and muscle strength with the balance control among older adults

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Journal of Sport and Health Science 2021年第5期10卷 585-593页

作者： Qipeng Song Xinyan Zhang Min Mao Wei Sun Cui Zhang Yan Chen Li Li College of Sports and Health Shandong Sport UniversityJinan 250102China Department of Statistics and Analytical Sciences Kennesaw State UniversityKennesawGA 30144USA Department of Allied Health the University of North Carolina at Chapel HillChapel HillNC 27599USA Lab of Biomechanics Shandong Institute of Sport ScienceJinan 250102China Key Laboratory of Exercise and Health Sciences of Ministry of Education Shanghai University of SportShanghai 200438China Department of Health Sciences and Kinesiology Georgia Southern UniversityStatesboroGA 30460USA

Background:balance impairment is one of the strongest risk factors for ***,cutaneous sensitivity,and muscle strength are 3 important contributors to balance control in older *** relationship that dynamic and static balance control has to proprioception,cutaneous sensitivity,and muscle strength is still *** study was performed to investigate the relationship these contributors have to dynamic and static balance ***:A total of 164 older adults(female=89,left dominant=15,age:73.5±7.8 years,height:161.6±7.1 cm,weight:63.7±8.9 kg,mean±SD)participated in this *** tested the proprioception of their knee flexion/extension and ankle dorsi/plantarflexion,along with cutaneous sensitivity at the great toe,first and fifth metatarsals,arch,and heel,and the muscle strength of their ankle dorsi/plantarflexion and hip *** Berg balance Scale(BBS)and the root mean square(RMS)of the center of pressure(CoP)were collected as indications of dynamic and static balance control.A partial correlation was used to determine the relationship between the measured outcomes variables(BBS and CoPRMS)and the proprioception,cutaneous sensitivity,and muscle strength ***:Proprioception of ankle plantarflexion(r=-0.306,p=0.002)and dorsiflexion(r=-0.217,p=0.030),and muscle strength of ankle plantarflexion(r=0.275,p=0.004),dorsiflexion(r=0.369,p<0.001),and hip abduction(r=0.342,p<0.001)were weakly to moderately correlated with *** of ankle dorsiflexion(r=0.218,p=0.020)and cutaneous sensitivity at the great toe(r=0.231,p=0.041)and arch(r=0.285,p=0.002)were weakly correlated with CoP-RMS in the anteroposterior *** of ankle dorsiflexion(r=0.220,p=0.035),knee flexion(r=0.308,p=0.001)and extension(r=0.193,p=0.040),and cutaneous sensitivity at the arch(r=0.206,p=0.028)were weakly to moderately correlated with CoP-RMS in the mediolateral ***:There is a weak-to-moderate relationship betwee

关键词： Body stability dynamic balance Kinesthesia Plantar sensation Postural control

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Stability and agility： biped running over varied and unknown terrain

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Frontiers of Information Technology & Electronic Engineering 2015年第4期16卷 283-292页

作者： Yang YI Zhi-yun LIN College of Electrical Engineering Zhejiang University

We tackle the problem of a biped running over varied and unknown *** is a necessary skill for a biped moving fast,but it increases the challenge of dynamic balance,especially when a biped is running on varied terrain without terrain information(due to the difficulty and cost of obtaining the terrain information in a timely manner).To address this issue,a new dynamic indicator called the sustainable running criterion is *** main idea is to sustain a running motion without falling by maintaining the system states within a running-feasible set,instead of running on a periodic limit cycle gait in the traditional *** meet the precondition of the criterion,the angular moment about the center of gravity(COG) is restrained close to zero at the end of the stance *** to ensure a small state jump at touchdown on the unknown terrain,the velocity of the swing foot is restrained within a specific range at the end of the flight ***,the position and velocity of the COG are driven into the running-feasible set.A five-link biped with underactuated point foot is considered in *** is able to run over upward and downward terrain with a height difference of 0.15 m,which shows the effectiveness of our control scheme.

关键词： Underactuated running biped dynamic balance Varied and unknown terrain

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balance Performance in Female Collegiate Athletes

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Journal of Sports Science 2014年第1期2卷 13-20页

作者： Harish Chander Christopher J. MacDonald Nicole C. Dabbt Charles R. Allen Hugh S. Lamont John C. Garner Department of Kinesiology Mississippi State University Mississippi State MS 39762 USA University of Mississippi Department of Health Exercise Science and Recreation Management University MS 38677 USA Department of Kinesiology Recreation and Sport Studies Coastal Carolina University Conway 29526 USA Department of Kinesiology California State University San Bernardino 92407 USA Department of Exercise Science California Lutheran University Thousand Oaks 91360 USA

Proper balance is essential for athletes during competition and training as sport places different balance requirements on the human body. The purpose of the study was to analyze balance performance among female athletes using COP （center of pressure） sway parameters. Twenty one NCAA （National Collegiate Athletic Association） division I female athletes （soccer, volleyball and dance） completed the study. Static balance was assessed using UST （unilateral stance test） and dynamic balance was assessed using MCT （motor control test） on the NeuroCom Equitest. Sway velocities, root mean square sway and reaction time latencies were used to quantify balance. A one-way between subjects ANOVA （analysis of variance） was performed to analyze these balance parameters. Significant （p 〈 0.05） differences between groups were found and post hoc comparisons revealed that the volleyball and dance groups had better static balance compared to soccer players, while both soccer and volleyball groups had better dynamic balance compared to the dance group. The results from the study indicate two points： first, differences in balance performance among female athletes in different sporting discipline; second, there is no relationship between static and dynamic balance. This indicates that it may be more beneficial to assess and train for static and dynamic balance individually.

关键词： Athletes static balance dynamic balance center of pressure.

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