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Autogenous Shrinkage and Crack Resistance of Carbon Nanotubes Reinforced Cement‑Based Materials
Yanming Liu,Tao Shi,Yujing Zhao,Yuan Gu,Zhifang Zhao,Jiabin Chen,Bingmiao Zheng,Shichong Shi 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.5
Cracking caused by shrinkage deformation of cement-based materials at early age is a major problem leading to material failure in restrained conditions. Carbon nanotubes (CNTs) are incorporated into cement-based materials, and the autogenous shrinkage and crack resistance of the new composite materials obtained by linear shrinkage and ring tests are studied to solve the destruction of the materials caused by the shrinkage of cement-based materials. The results showed that addition of CNTs significantly inhibited the autogenous shrinkage of cement-based materials with maximum reduction rate above 40%. CNTs also significantly improved the cracking resistance of cement-based materials. The optimal effect was noticed at CNTs content of 0.1 wt%. The incorporation of CNTs not only inhibits the autogenous shrinkage of cement-based materials, but also inhibits the drying shrinkage of cement-based materials to some extent. Therefore, carbon nanotubes have the potential to solve the destruction of materials caused by shrinkage of cement-based materials.
Yanming Zhang,Zhen Zhang,Guojun Zhang,Wenyuan Li 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.2
Energy consumption and machining accuracy are considered to be two important attributes of performance indicators for green operations of wire electric discharge machining (WEDM). However, there is a paucity of studies that focus on the energy consumption and geometric error caused by thermal deformation. In this paper, a hybrid technique of WEDM with assisted magnetic field (MF) is proposed for enhancing machining performance to reduce energy consumption and thermal deformation. Based on the principles of thermal deformation, energy consumption, and magnetic field-assisted WEDM, a set of experiments is conducted to investigate thermal deformation and energy consumption of MF-assisted WEDM and conventional WEDM machining of Inconel 718. The effects of magnetic field on thermal deformation, discharge waveforms, surface integrity, and energy consumption are analyzed, and it is concluded that the proposed hybrid technique of MF-assisted WEDM offers numerous advantages and potential for applications in the green precision manufacturing field.
AGV Motion Balance and Motion Regulation Under Complex Conditions
Yanming Quan,Ma Lei,Weizhao Chen,Ronghui Wang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2
AGV cargo robot is widely used in flexible production line of intelligent factory. Different conditions for cargo instability occurs in different production line scenarios, different loading conditions and different movement states, which greatly affect the security and reliability of AGV cargo transport. In order to realize the acceleration limits of the buckling critical instability state under different loading and motion states, a multi-sensor sensing system was built on the AGV platform. The inertial measurement unit, pressure sensor and odometer were used to realize the cargo state’s real-time perception and AGV motion state. The pressure sensor and inertial measurement unit were used to measure the cargo gravity center position that affects the carry stability and neural network algorithm training was used to get accurate judgment of different motion states. The kinematic mechanical equilibrium model was established to analyze the relative equilibrium state of AGV and cargo under different motion states and to determine the cargo critical instability acceleration constraint conditions under different transport conditions of different goods. The test results show that the platform can obtain the cargo gravity center position and perceive the AGV motion state in real-time, feedback the acceleration constraint under the current motion state in real-time and regulate the AGV to realize the safe and stable delivery of the cargo at any time under the multi-sensor perception.
Reverse Micellar Dyeing of Wool Fabric with Reactive Dyes
Yanming Wang,Yiu-lun Tang,Cheng-hao Lee,Chi-wai Kan 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
The approach of using reverse micelle with nonionic surfactant (poly(ethylene glycol), PEG)) as building blockhas been employed to investigate dyeability of wool fabrics with reactive dyes in a one-bath non-aqueous solvent system. Three colours were used and they were encapsulated in the core of the PEG-based reverse micelle under optimised processparameters (i.e. (i) Solvent volume to wool fabric weight ratio (v/w)=10:1; (ii) Surfactant/water mole ratio=0.04:1; (iii)Surfactant/co-surfactant mole ratio=1:8; (iv) Volume of water-pool for dye=0.5 ml; (v) Dyeing time=50 minutes; and (vi)Dyeing temperature=88 oC). Comparison of non-aqueous and aqueous-based (water-based) dyeing was conducted in terms ofdyeability as reflected by colour yield and colour fastness properties. Experimental results revealed that the reverse micellarnon-aqueous dyeing system can provide a better dyeing performance than aqueous-based dyeing system.
Edge-balance index sets of the power-cycle nested graph C_n^2 x P_2n(n ≡ 1(mod2))
Yanming Chang,Yuge Zheng 장전수학회 2012 Advanced Studies in Contemporary Mathematics Vol.22 No.4
In this paper, mainly using the methods and techniques of graph theory and combinatorial mathematics to research on the largest edge-balance index of the graph C_n^2 x P_2n(n ≡ 1(mod2)) , the edge-balance index sets of the graph are discussed, and nally getting the constructive proof about all the edge-balance index sets of C_n^2 x P_2n(n ≡ 1(mod2)) .
Removal of Pb2+ from the aqueous solution by tartrate intercalated layered double hydroxides
Yanming Shen,Xiaolei Zhao,Xi Zhang,Shifeng Li,Dongbin Liu,Lihui Fan 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1
Adsorption of Pb2+ ion by a tartrate intercalated MgAl layered double hydroxides (MgAl-TA LDHs) was studied. The adsorption isotherms and kinetics were investigated as a function of various experimental parameters using batch adsorption experiments. The results indicated that the adsorption isotherm was well described by Sips model. The kinetic adsorption data were fitted well to the pseudo-second-order kinetic equation. The adsorption of Pb2+ was controlled mainly by the chemical process combined with intraparticle diffusion. Parameters of adsorption thermodynamic suggested that the interaction of Pb2+ adsorbed by MgAl-TA LDHs adsorbents was thermodynamically spontaneous and endothermic.
Analysis of Interference with WPT Mobile and Portable Devices That Use NFC
Yanming Cheng,Ilkyoo Lee,Cheng Liu,Jing Niu 대한전자공학회 2019 IEIE Transactions on Smart Processing & Computing Vol.8 No.5
Currently, interest in wireless power transfer (WPT) is increasing for mobile- and portable-device applications. It is necessary to analyze the interference between WPT chargers and other wireless devices for the efficient use of frequency resources. In this paper, the impact of a WPT charger for a cellular phone and a near field communication (NFC) device is analyzed by using the minimum coupling loss (MCL) method and the Monte Carlo (MC) method. As a result, the difference in the maximum allowed transmitting power of a WPT charger is obtained based on different numbers of WPT chargers in order to protect NFC devices without a protection distance between them and the WPT charger. The analysis approach and results are expected to be used as a guideline to investigate the coexistence of low-power devices.