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Bioinspired Passive Tactile Sensors Enabled by Reversible Polarization of Conjugated Polymers

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Nano-Micro Letters 2025年第1期17卷 361-377页

作者： Feng He Sitong Chen Ruili Zhou Hanyu Diao Yangyang Han Xiaodong wu School of Mechanical Engineering Sichuan UniversityChengdu 610065People’s Republic of China School of Software Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065People’s Republic of China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065People’s Republic of China

Tactile perception plays a vital role for the human body and is also highly desired for smart prosthesis and advanced *** to active sensing devices,passive piezoelectric and triboelectric tactile sensors consume less power,but lack the capability to resolve static ***,we address this issue by utilizing the unique polarization chemistry of conjugated polymers for the first time and propose a new type of bioinspired,passive,and bio-friendly tactile sensors for resolving both static and dynamic ***,to emulate the polarization process of natural sensory cells,conjugated polymers(including poly(3,4-ethylenedioxythiophen e):poly(styrenesulfonate),polyaniline,or polypyrrole)are controllably polarized into two opposite states to create artificial potential *** controllable and reversible polarization process of the conjugated polymers is fully in situ ***,a micro-structured ionic electrolyte is employed to imitate the natural ion channels and to encode external touch stimulations into the variation in potential difference *** with the currently existing tactile sensing devices,the developed tactile sensors feature distinct characteristics including fully organic composition,high sensitivity(up to 773 mV N^(−1)),ultralow power consumption(nW),as well as superior *** demonstrations,both single point tactile perception(surface texture perception and material property perception)and two-dimensional tactile recognitions(shape or profile perception)with high accuracy are successfully realized using self-defined machine learning *** tactile sensing concept innovation based on the polarization chemistry of conjugated polymers opens up a new path to create robotic tactile sensors and prosthetic electronic skins.

关键词： Passive tactile sensors Reversible polarization of conjugated polymers Tactile perception Machine learning algorithm Object recognition

Synergistic anionic/zwitterionic mixed surfactant system with high emulsification efficiency for enhanced oil recovery in low permeability reservoirs

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Petroleum Science 2024年第2期21卷 936-950页

作者： Hai-rong wu rong Tan Shi-Ping Hong Qiong Zhou Bang-yu Liu Jia-Wei Chang Tian-Fang Luan Ning Kang Ji-Rui Hou National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum-BeijingBeijing102249China Unconventional Petroleum Research Institute China University of Petroleum-BeijingBeijing102249China Gas Production Plant 5 of PetroChina Changqing Oilfield Company PetroChinaXi'an710000ShaanxiChina College of Petroleum Engineering China University of Petroleum-BeijingBeijing102249China College of Science China University of Petroleum-BeijingBeijing102249China Kazakh-British Technical University Almaty050000Kazakhstan

Emulsification is one of the important mechanisms of surfactant flooding. To improve oil recovery for low permeability reservoirs, a highly efficient emulsification oil flooding system consisting of anionic surfactant sodium alkyl glucosyl hydroxypropyl sulfonate(APGSHS) and zwitterionic surfactant octadecyl betaine(BS-18) is proposed. The performance of APGSHS/BS-18 mixed surfactant system was evaluated in terms of interfacial tension, emulsification capability, emulsion size and distribution, wettability alteration, temperature-resistance and salt-resistance. The emulsification speed was used to evaluate the emulsification ability of surfactant systems, and the results show that mixed surfactant systems can completely emulsify the crude oil into emulsions droplets even under low energy conditions. Meanwhile,the system exhibits good temperature and salt resistance. Finally, the best oil recovery of 25.45% is achieved for low permeability core by the mixed surfactant system with a total concentration of 0.3 wt%while the molar ratio of APGSHS:BS-18 is 4:6. The current study indicates that the anionic/zwitterionic mixed surfactant system can improve the oil flooding efficiency and is potential candidate for application in low permeability reservoirs.

关键词： Anionic/zwitterionic mixed surfactant system Emulsification Synergistic effect Low permeability reservoir Enhanced oil recovery

DEM simulations of die filling during pharmaceutical tabletting

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Particuology 2008年第6期6卷 412-418页

作者： Chuan-yu wu School of Chemical Engineering University of Birmingham Edgbaston Birmingham B15 2TT UK

The flow behaviour of powders from a stationary shoe into a moving die, which mimics the die filling process in a rotary tablet press, was analysed using a discrete element method （DEM）, in which 2D irregular shaped particles were considered. The influence of the particle shape, size and size distribution, the number of particles used in the simulation, the initial height of powder bed in the shoe, and the filling speed on the average mass flow rate and the critical filling speed （the highest speed at which the die can be completely filled） were explored. It has been found that a maximum flow rate is obtained at the critical filling speed for all systems investigated and poly-disperse systems have higher mass flow rates and higher critical filling speeds than mono-disperse systems. In addition, the powder with particles which can tessellate generally has a lower filling rate and a lower critical titling speed.

关键词： DEM Die filling Tabletting Powder compaction Mass flow rate Critical filling speed

Solving quantified constraint satisfaction problems with value selection rules

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Frontiers of Computer Science 2020年第5期14卷 153-163页

作者： Jian Gao Jinyan Wang Kuixian wu rong Chen College of Information Science and Technology Dalian Maritime UniversityDalian116026China Logistics Research Institute Dalian Maritime UniversityDalian116026China College of Computer Science and Information Engineering Guangxi Normal UniversityGuilin541004China

Solving a quantified constraint satisfaction problem(QCSP)is usually a hard task due to its computational *** algorithms play an important role in solving this problem,among which backtrack algorithms are *** a backtrack algorithm,an important step is assigning a variable by a chosen value when exploiting a branch,and thus a good value selection rule may speed up *** this paper,we propose two value selection rules for existentially and universally quantified variables,respectively,to avoid unnecessary *** rule for universally quantified variables is prior to trying failure values in previous branches,and the rule for existentially quantified variables selects the promising values *** rules are integrated into the state-of-the-art QCSP solver,i.e.,QCSP-Solve,which is an exact solver based on *** perform a number of experiments to evaluate improvements brought by our *** computational results,we can conclude that the new value selection rules speed up the solver by 5 times on average and 30 times at *** also show both rules perform well particularly on instances with existentially and universally quantified variables occurring alternatively.

关键词： quantified CSP backtracking value selection fail-first principle

New Start-up Method for a Closed-Cycle Compression System with Gas Bearings and Its Characteristics

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 118-133页

作者： Huaqi Lian Hong wu yulong Li Chengjun rong National Key Laboratory of Science and Technology on Aero Engines Aero-thermodynamics&Collaborative Innovation Center for Advanced Aero-Engine School of Energy and Power EngineeringBeihang UniversityBeijing100191China

Gas bearings,which have the advantages of low frictional resistance and power loss,high rotational speed and high temperature operation,and long life,are more suitable than are traditional liquid lubricated bearings because of their high precision,high rotational speed,and special condition ***,the problem of starting a closed-cycle compression system with gas bearings still needs to be solved for practical ***,a new start-up method for a closed-cycle compression system with aerostatic gas bearings is proposed in this ***,this paper presents a numerical simulation and experimental investigation of the method’s feasibility and characteristics during the start-up process when the gas tank’s initial pressure is *** results show that the gas tank volume is approximately directly proportional to the start-up time allowable,and a gas tank volume sufficiently small,which not only ensures the feasibility of start-up,but also affects other components only slightly,can be obtained.A perfect combination of radial and axial loads also can be achieved to make the start-up time allowable as long as possible.R134a is a better choice for the working medium than is air,as the start-up time allowable is longer,which leads to a smaller gas *** research proposes a new start-up method for a closed-cycle compression system with aerostatic gas bearings which has sufficient load capacity to support system during the start-up method.

关键词： Gas bearing Start-up method Gas tank Start-up time allowable

Washed microbiota transplantation reduces serum uric acid levels in patients with hyperuricaemia

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World Journal of Clinical Cases 2022年第11期10卷 3401-3413页

作者： Jin-rong Cai Xin-Wen Chen yu-Jian He Bin wu Min Zhang Li-Hao wu School of Clinical Medicine Guangdong Pharmaceutical UniversityGuangzhou 510030Guangdong ProvinceChina Department of Epidemiology and Health Statistics Guangdong Pharmaceutical UniversityGuangzhou 510220Guangdong ProvinceChina Department of Gastroenterology The First Affiliated Hospital of Guangdong Pharmaceutical UniversityGuangzhou 510030Guangdong ProvinceChina Research Center Engineering Techniques of Microbiota-Targeted Therapies of Guangdong ProvinceGuangzhou 510030Guangdong ProvinceChina

BACKGROUND Previous studies have found that hyperuricaemia(HUA)is closely related to intestinal flora *** The current study investigated the effects and safety of washed microbiota transplantation(WMT)on serum uric acid(SUA)levels in different *** A total of 144 patients who received WMT from July 2016 to April 2020 in the First Affiliated Hospital of Guangdong Pharmaceutical University and had SUA data before treatment were *** in SUA levels before and after treatment were retrospectively reviewed based on short-term and mid-term effects of WMT *** levels measured in the last test within 3 mo after the first WMT represented the short-term effect,and SUA levels measured in the last test within 3-6 mo after the first WMT represented the mid-term *** patients were divided into an HUA group(SUA>416μM)and a normal uric acid(NUA)group(SUA≥202μM to≤416μM)based on pretreatment SUA *** Average short-term SUA levels in the HUA group decreased after WMT(481.00±99.85 vs 546.81±109.64μM,n=32,P0.05).Only 1/144 patients developed mild diarrhea after *** WMT reduces short-term SUA levels in patients with HUA with mild side effects but has no obvious effect on SUA levels in patients with NUA.

关键词： Washed microbiota transplantation Hyperuricaemia Intestinal flora Effect Safety Retrospective study

A multi-objective design method for seismic retrofitting of existing reinforced concrete frames using pin-supported rocking walls

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Frontiers of Structural and Civil Engineering 2022年第9期16卷 1089-1103页

作者： yue CHEN rong XU Hao wu Tao SHENG Institute of Engineering Mechanics China Earthquake AdministrationKey Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake AdministrationHarbin 150088China Research Center of Industrialization Construction Technology of Zhejiang Province Ningbo University of TechnologyNingbo 315106China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China College of Civil and Environmental Engineering Ningbo UniversityNingbo 315211China

Over the past several decades,a variety of technical ways have been developed in seismic retrofitting of existing reinforced concrete frames(RFs).Among them,pin-supported rocking walls(PWs)have received much attentions to researchers ***,it is still a challenge that how to determine the stiffness demand of PWs and assign the value of the drift concentration factor(DCF)for entire systems rationally and *** this paper,a design method has been exploited for seismic retrofitting of existing RFs using PWs(RF-PWs)via a multi-objective evolutionary ***,the method has been investigated and verified through a practical ***,a parametric analysis was executed to exhibit the strengths and working mechanism of the multi-objective design *** sum up,the findings of this investigation show that the method furnished in this paper is feasible,functional and can provide adequate information for determining the stiffness demand and the value of the DCFfor ***,it can be applied for the preliminary design of these kinds of structures.

关键词： pin-supported rocking wall reinforced concrete frame seismic retrofit stiffness demand drift concentration factor multi-objective design genetic algorithm Pareto optimal solution

Size and shape controllable preparation of graphene sponge by freezing, lyophilizing and reducing in container

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Science China(Technological Sciences) 2016年第5期59卷 709-713页

作者： ZHAO LianQin yu BaoWei ZHANO XiaoLiang wu RuiHan LIU XiaoYang LIAO rong YANG ShengTao LUO JianBin College of Chemistry and Environment Protection Engineering Southwest University for Nationalities Chengdu 610041 China

Graphene sponge(GS) is a porous 3D structure of graphene. Although hydrothermal reduction, chemical vapor deposition, solution reduction and high temperature annealing could be used for the preparation of GS, the size and shape cannot be well controlled. Herein, we reported a facile method to prepare GS under mild condition in a size and shape controllable way. Graphene oxide was lyophilized to form the spongy structure and reduced by steamy hydrazine hydrate to produce GS. The size and shape of GS prepared were nearly identical to that of the container. The reduction degree of GS could be regulated by the reduction temperature and time.

关键词： graphene sponge size shape reduction porous materials

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弧焊短路过渡过程的随机性与稳定性

石油化工高等学校学报 2004年第4期17卷 54-56,60页

作者：俞建荣吴波蒋力培邹勇罗建蒲雨龙北京石油化工学院机械工程系北京102617

弧焊过程的稳定性直接影响焊缝成型和焊接质量 ,研究弧焊过程稳定性的目的是通过焊接实验获得焊接稳定性及其稳定区域的描述方法。在CO2 弧焊短路过渡过程焊接电流、弧压对特征参数影响的大量焊接试验的基础上 ,通过对焊接规范不变情形... 详细信息

弧焊过程的稳定性直接影响焊缝成型和焊接质量 ,研究弧焊过程稳定性的目的是通过焊接实验获得焊接稳定性及其稳定区域的描述方法。在CO2 弧焊短路过渡过程焊接电流、弧压对特征参数影响的大量焊接试验的基础上 ,通过对焊接规范不变情形下特征参数的稳定性及其稳定区域的分析 ,得到了焊接稳定性的描述方法。研究表明在焊接规范相同且弧焊过程稳定的状态下 ,CO2 弧焊熔滴短路过渡过程的特征参数是随机而分散的。

关键词： CO2弧焊短路过渡随机性稳定性