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Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study EI Scopus SCIE
期刊论文 | 2019 , 117 (3) , 267-279 | Molecular Physics
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Abstract :

Magnesium alloy is one of the most promising biomaterials in vascular clogging and bone injury. But it still has some defects to overcome and the key task is to control the degradation velocity. In this study, the reaction between NaCl solution and MgO is simplified as the first stage of the degradation of magnesium alloy stent, and the adsorption properties of NaCl solution on the MgO surface are investigated by MD simulation. The distribution of each component of the solution perpendicular to the MgO surface is analysed and the diffusion coefficient is calculated. Besides, a parameterised analysis is carried out. The results show that there is a solution layer formed at the surface of the MgO, and the existence of metal oxide restricts the diffusion of the solution. The adsorption capacity and the diffuse rate have an opposite variation tendency with the change of temperature, concentration and velocity. The self-diffusion coefficient of the solution increases with the increase in temperature as well as velocity, inversely adsorption capacity decreases with the increase in velocity. Besides, the influence of temperature on the adsorption capacity is small. What is more, the diffusion coefficient decreases while the adsorption capacity increases with the increase in concentration. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

Keyword :

Adsorption behaviour Adsorption capacities Adsorption properties Change of temperatures Parametric -analysis Self-diffusion coefficients Solution layers Variation tendencies

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GB/T 7714 Tang, Xiaoli , Bian, Qingfei , Wang, Qiuwang et al. Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study [J]. | Molecular Physics , 2019 , 117 (3) : 267-279 .
MLA Tang, Xiaoli et al. "Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study" . | Molecular Physics 117 . 3 (2019) : 267-279 .
APA Tang, Xiaoli , Bian, Qingfei , Wang, Qiuwang , Zeng, Min . Adsorption behaviour of NaCl solution on the surface of MgO: a molecular dynamics study . | Molecular Physics , 2019 , 117 (3) , 267-279 .
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Lattice Boltzmann simulation for melting control through an extra magnetic quadrupole field SCIE
期刊论文 | 2019 , 75 (4) , 254-270 | NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
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Abstract :

Melting widely exists in various industrial applications and melting control through an extra magnetic field is a promising subject. Recent studies mainly focus on the suppression effect of the magnetic induced Lorentz force. However, the influence of magnetic force is less investigated. The present study concentrates on investigating the impact of magnetic force, along with gravity, on the melting process. The magnetic quadrupole field is used to generate magnetic force and the temperature distribution, velocity field and melting front are obtained through lattice Boltzmann method. Results indicate that the magnetic force can enhance the flow and heat transfer during the melting process and it has the potential to be used to control the process. Besides, the gravity accelerates the melting process when the dimensionless magnetic force parameter is less than 20, whereas its effect can be ignored when the parameter is larger than 20.

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GB/T 7714 Dai, Renkun , Bian, Qingfei , Wang, Yazhou et al. Lattice Boltzmann simulation for melting control through an extra magnetic quadrupole field [J]. | NUMERICAL HEAT TRANSFER PART A-APPLICATIONS , 2019 , 75 (4) : 254-270 .
MLA Dai, Renkun et al. "Lattice Boltzmann simulation for melting control through an extra magnetic quadrupole field" . | NUMERICAL HEAT TRANSFER PART A-APPLICATIONS 75 . 4 (2019) : 254-270 .
APA Dai, Renkun , Bian, Qingfei , Wang, Yazhou , Wang, Qiuwang , Zeng, Min . Lattice Boltzmann simulation for melting control through an extra magnetic quadrupole field . | NUMERICAL HEAT TRANSFER PART A-APPLICATIONS , 2019 , 75 (4) , 254-270 .
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Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles SCIE
期刊论文 | 2019 , 12 (3) | ENERGIES
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Abstract :

The most extensively used heat exchanger in numerous research fields and industrial processes is the shell and tube heat exchanger. The selection of the baffle plays a vital role to regulate and increase the thermohydraulic performance and also to decrease fluid-induced vibrations due to shell side flow. 3-D computational fluid dynamics (CFD) and fluid-structure interaction (FSI) have been done to analyze the pressure drop, heat transfer coefficient, vortex shedding, and tube deformation due to induced vibrations among the recently developed clamping antivibration baffles with square twisted tubes, helical baffles with cylindrical tubes, and conventional segmental baffles with cylindrical tubes at different shell side flow rates by using commercial software ANSYS. Complete heat exchangers are modeled for numerical comparison; the thermohydraulic performance of the numerical model shows the suitable agreement by validating it with already published results and Esso method for single segmental baffles. It is then used to compare the performance of the same heat exchangers with CBSTT and HBCT. Thermohydraulic performance of CBSTT-STHX is better than SGCT-STHX. The heat transfer coefficient of heat exchangers with tube-to-baffle-hole clearance is higher and there is a reduction in the pressure drop compared to the results of STHXs without tube-to-baffle-hole clearance. The deformation in the tubes and vortex-induced vibrations are minimum in STHX with CBSTT than in STHXs with HBCT and SGCT.

Keyword :

fluid-induced vibrations numerical simulation clamping antivibration baffles shell and tube heat exchanger comprehensive performance helical baffles square twisted tubes segmental baffles

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GB/T 7714 Naqvi, S. M. A. , Wang, Qiuwang . Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles [J]. | ENERGIES , 2019 , 12 (3) .
MLA Naqvi, S. M. A. et al. "Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles" . | ENERGIES 12 . 3 (2019) .
APA Naqvi, S. M. A. , Wang, Qiuwang . Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles . | ENERGIES , 2019 , 12 (3) .
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Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels EI Scopus SCIE
期刊论文 | 2019 , 341 , 91-99 | Nuclear Engineering and Design
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

© 2018 Elsevier B.V. Nuclear power is considered as the most promising energy for power generation due to low carbon emission, small fuel cost, high efficiency and reliability. As a new type of heat exchanger, printed circuit heat exchanger (PCHE) with high compactness and efficiency can be used for the supercritical carbon dioxide (SCO2) Brayton power cycle in the Gen IV nuclear reactor systems to transfer great amount of heat from nuclear reactors. The chemical etching technology plays an important role in production of heat transfer channels for PCHEs from micron level to millimeter level. In order to produce high-quality heat transfer channels, the chemical spray etching method is used in the manufacturing process. In this work, a chemical spray etching experiment was carried out to analyse the etching phenomenon on the PCHE channels. The influences of etching parameters, such as etching rate, lateral erosion, surface roughness, etc., are investigated. The results showed that the etching parameters significantly affected the etching quality, which provided comprehensive view of details for the etching process. Besides, an orthogonal array testing strategy (OATS) was adopted for chemical spray etching to synthetically study the influences of FeCl3 and H3PO4 concentrations, etching temperature, spray pressure on the etching rate, the lateral erosion and the surface roughness. The optimal combination of etching parameters in the setting level was investigated and obtained, which is in the condition with spray gage pressure of 0.15 MPa, etching temperature of 35 °C, FeCl3 concentration of 400 g·L−1 and H3PO4 concentration of 1.5 M. The present work is of significance to realize the low-cost, high-efficiency and controllable manufacturing process of PCHEs.

Keyword :

Chemical reaction Etching factor Etching rate Printed circuit heat exchanger Spray etching Surface roughness

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GB/T 7714 Xin, Fei , Ma, Ting , Chen, Yitung et al. Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels [J]. | Nuclear Engineering and Design , 2019 , 341 : 91-99 .
MLA Xin, Fei et al. "Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels" . | Nuclear Engineering and Design 341 (2019) : 91-99 .
APA Xin, Fei , Ma, Ting , Chen, Yitung , Wang, Qiuwang . Study on chemical spray etching of stainless steel for printed circuit heat exchanger channels . | Nuclear Engineering and Design , 2019 , 341 , 91-99 .
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Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger EI Scopus SCIE
期刊论文 | 2019 , 146 , 805-814 | Applied Thermal Engineering
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Printed circuit heat exchangers (PCHEs) can be used as the recuperator and condenser in the supercritical CO2 (sCO2) Brayton cycle of fast cooled reactor (FCR) systems. Most researchers focused on heat transfer improvement of the core structure in previous literatures. However, the flow non-uniformity may seriously decrease the comprehensive performance of PCHEs by increasing the pressure loss. The sCO2 temperature in partial channels may be lower than the pseudo-critical temperature due to non-uniform flow distribution. Thereby, it is possible that the condenser may deviate from the steady operating condition and work inefficiently. In this paper, the flow non-uniformity of a straight-channel PCHE condenser with four different inlet headers is analyzed. Based on the streamline profile, a novel modified hyperbolic inlet header is proposed, which can reduce the flow non-uniformity by 46% compared with the current practical manufactured model. Simultaneously, the improvement of flow uniformity by the novel inlet header may increase the overall performance by 39.5%. Furthermore, the effect of core length is also investigated, and it is found that the flow non-uniformity can be minimized by varying the core length. Additionally, the relationship between the standard deviation of flow non-uniformity and the shape factor is quantitatively investigated and analyzed. Result shows that the flow non-uniformity can be expressed as a function of the shape factor and dimensionless core length. Finally, the correlations of the thermo-hydraulic performance of the straight-channel PCHE with corrections for flow non-uniformity are proposed. © 2018

Keyword :

Inlet header Non-uniformities Printed circuit heat exchangers Supercritical CO2 Thermo-hydraulic performance

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GB/T 7714 Chu, Wen-xiao , Bennett, Katrine , Cheng, Jie et al. Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger [J]. | Applied Thermal Engineering , 2019 , 146 : 805-814 .
MLA Chu, Wen-xiao et al. "Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger" . | Applied Thermal Engineering 146 (2019) : 805-814 .
APA Chu, Wen-xiao , Bennett, Katrine , Cheng, Jie , Chen, Yi-tung , Wang, Qiu-wang . Numerical study on a novel hyperbolic inlet header in straight-channel printed circuit heat exchanger . | Applied Thermal Engineering , 2019 , 146 , 805-814 .
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Experimental study of forced convective heat transfer in grille-particle composite packed beds EI Scopus SCIE
期刊论文 | 2019 , 129 , 103-112 | International Journal of Heat and Mass Transfer
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

Due to high surface area-to-volume ratio and superior thermal performance, packed beds are widely used in variety of industries. In the present study, forced convective heat transfer in a novel grille-particle composite packing (GPCP) bed, was experimentally investigated in pursuit of reduced pressure drop and enhanced overall heat transfer. The effects of sub-channel to particle diameter ratio, grille thickness and grille thermal conductivity on pressure drop, Nusselt number and overall heat transfer efficiency in the grille-particle channel were carefully analyzed. And performances of grille-particle channels were compared with those of random particle channels in detail. It is shown that looser packing structure compromises heat transfer in the grille-particle channel, while decreasing pressure drop and improving overall heat transfer efficiency. Meanwhile, for the same Reynolds number and particle diameter, higher grille thermal conductivity and thinner grille thickness also improve overall heat transfer performance. Finally, when compared with random packing, both pressure drop and heat transfer in grille-particle channels are shown to be reduced, while overall heat transfer efficiency is improved, especially when employing relatively small particle diameters. © 2018 Elsevier Ltd

Keyword :

Forced convective heat transfer Heat transfer efficiency Overall heat transfer performance Packing structure Particle composites Particle diameters Random packing Thermal Performance

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GB/T 7714 Hu, Yingxue , Wang, Jingyu , Yang, Jian et al. Experimental study of forced convective heat transfer in grille-particle composite packed beds [J]. | International Journal of Heat and Mass Transfer , 2019 , 129 : 103-112 .
MLA Hu, Yingxue et al. "Experimental study of forced convective heat transfer in grille-particle composite packed beds" . | International Journal of Heat and Mass Transfer 129 (2019) : 103-112 .
APA Hu, Yingxue , Wang, Jingyu , Yang, Jian , Mudawar, Issam , Wang, Qiuwang . Experimental study of forced convective heat transfer in grille-particle composite packed beds . | International Journal of Heat and Mass Transfer , 2019 , 129 , 103-112 .
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NATURAL CONVECTION HEAT TRANSFER IN A NANOFLUID-FILLED HORIZONTAL LAYER WITH SINUSOIDAL WALL TEMPERATURE AT THE BOTTOM BOUNDARY CPCI-S SCIE
会议论文 | 2018 , 49 (11) , 1059-1076 | 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT)
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Abstract :

Transient natural convection heat transfer of a water-based nanofluid in an infinite horizontal layer submitted to the influence of a time-periodic boundary temperature is studied numerically using finite volume approach. The bottom wall temperature of the horizontal layer is varied sinusoidally with time at a constant temperature, while the top wall is cooled at a relatively low temperature. CuO nanoparticles are taken into consideration. The computational region of height 1 and horizontal width 1 is adopted, and numerical computation is performed. By considering Brownian motion, the effects of the Rayleigh number and solid volume fraction on the flow and temperature patterns as well as the heat transfer rate within the horizontal layer are presented. It is found that the time-averaged heat transfer rate decreases with increasing solid volume fraction at low Rayleigh numbers. However, at high Rayleigh numbers, all of the time-averaged Nusselt numbers for the CuO-water nanofluid with different nanoparticle volume fractions are larger than that for pure water, and there is an optimum solid volume fraction which results in the maximum time-averaged heat transfer rate.

Keyword :

time-periodic boundary temperature natural convection Brownian motion infinite horizontal layer nanofluids

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GB/T 7714 Wang, G. , Fan, Z. L. , Zeng, M. et al. NATURAL CONVECTION HEAT TRANSFER IN A NANOFLUID-FILLED HORIZONTAL LAYER WITH SINUSOIDAL WALL TEMPERATURE AT THE BOTTOM BOUNDARY [C] . 2018 : 1059-1076 .
MLA Wang, G. et al. "NATURAL CONVECTION HEAT TRANSFER IN A NANOFLUID-FILLED HORIZONTAL LAYER WITH SINUSOIDAL WALL TEMPERATURE AT THE BOTTOM BOUNDARY" . (2018) : 1059-1076 .
APA Wang, G. , Fan, Z. L. , Zeng, M. , Wang, Q. W. , Ozoe, H. . NATURAL CONVECTION HEAT TRANSFER IN A NANOFLUID-FILLED HORIZONTAL LAYER WITH SINUSOIDAL WALL TEMPERATURE AT THE BOTTOM BOUNDARY . (2018) : 1059-1076 .
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Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (2) , 379-383 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

In the present paper, a three dimensional mathematic model of solid oxide fuel cell (SOFC) with gradient porosity anode was established to simulate mass transfer and electrical performances in the SOFC. Compared with homogeneous porosity anode SOFC, gradient porosity anode SOFC shows better mass transfer and electrical performances. Results show that gradient porosity anode design not only remains high mass transfer performance, but also effectively adjusts thermal expansion match between the electrode and electrolyte. The maximum output power density of the gradient porosity anode design in this paper could reach 1.005 W•cm-2, which is at least 8.78% higher than that of homogeneous porosity anode SOFC. Therefore, gradient porosity anode design can significantly improve the electrical performance of SOFC. © 2018, Science Press. All right reserved.

Keyword :

Electrical performance Mass transfer performance Mathematic model Maximum output power densities Numerical study Porosity gradients

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GB/T 7714 Fu, Pei , Yang, Jian , Zeng, Min et al. Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) : 379-383 .
MLA Fu, Pei et al. "Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 2 (2018) : 379-383 .
APA Fu, Pei , Yang, Jian , Zeng, Min , Wang, Qiu-Wang . Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) , 379-383 .
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Numerical study of competition effects of laser parameters on a transient melt pool evolution process EI Scopus CSSCI-E
期刊论文 | 2018 , 70 , 607-612 | Chemical Engineering Transactions
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The melt pool, formed by the superheated molten metal, is the initiation of solid part and the general process of laser additive manufacture process. The transient phenomena in the melt pool are of paramount interest in obtaining an optimum mechanical performance. In this paper, the different transient evolution phenomena of melt pool for the moving and fixed laser beam during the laser irradiation process are investigated, then the quantitative competition effects of the laser parameters on those transient phenomena are also studied. The results show that the evolution of melt pool gradually enters into the quasi-steady-state for the moving laser condition, the deformation of free surface almost has no change near the forward of laser beam. However, the fixed laser condition has different evolution process and the deformation of free surface becomes larger and larger even piercing the workpiece. The melt pool evolution becomes vigorous and prone to enter the quasisteady- state with the increasing energy input per unit area which directly dominated by the laser parameters. Further investigation on the quantitative percentage of each parameter on the evolution shows that the laser scan speed is the most important factor for the evolution of melt pool. Copyright © 2018, AIDIC Servizi S.r.l.

Keyword :

Additive manufacture Competition effects Deformation of free surfaces Different evolutions Irradiation process Mechanical performance Transient evolution Transient phenomenon

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GB/T 7714 Bian, Qingfei , Tang, Xiaoli , Dai, Renkun et al. Numerical study of competition effects of laser parameters on a transient melt pool evolution process [J]. | Chemical Engineering Transactions , 2018 , 70 : 607-612 .
MLA Bian, Qingfei et al. "Numerical study of competition effects of laser parameters on a transient melt pool evolution process" . | Chemical Engineering Transactions 70 (2018) : 607-612 .
APA Bian, Qingfei , Tang, Xiaoli , Dai, Renkun , Wang, Qiuwang , Zeng, Min . Numerical study of competition effects of laser parameters on a transient melt pool evolution process . | Chemical Engineering Transactions , 2018 , 70 , 607-612 .
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Parametric study on thermoelectric power generator and microturbine combined power generation system EI Scopus CSSCI-E
期刊论文 | 2018 , 70 , 61-66 | Chemical Engineering Transactions
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Microturbine is an important power equipment for distributed energy system with the advantages of compact structure, light weight, low noise, and so on. However, its power generation efficiency is still too low while its cost is too high to be widely applied. Thermoelectric material is a solid-state energy converter which can directly convert thermal energy into electrical energy without affecting the original thermodynamic cycle. It is expected to significantly improve the system’s efficiency and reduce the power generation cost by integrating the thermoelectric generators into the microturbine system. In this study, a thermodynamic model is developed for the thermoelectric power generator and microturbine combined power generation system. The numerical results showed that the addition of thermoelectric power generators can increase the power output of microturbine system by 1-2 times. Increasing the figure of merit value of TEGs and turbine inlet temperature improve the power output and efficiency of the combined system, but there is an optimal compressor pressure ratio for the combined system. Copyright © 2018, AIDIC Servizi S.r.l.

Keyword :

Compressor pressure ratio Distributed energy systems Power generation efficiency Power generation systems Thermo-electric generators Thermo-Electric materials Thermodynamic model Turbine inlet temperature

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GB/T 7714 Qu, Zuoming , Ma, Ting , Yu, Xingfei et al. Parametric study on thermoelectric power generator and microturbine combined power generation system [J]. | Chemical Engineering Transactions , 2018 , 70 : 61-66 .
MLA Qu, Zuoming et al. "Parametric study on thermoelectric power generator and microturbine combined power generation system" . | Chemical Engineering Transactions 70 (2018) : 61-66 .
APA Qu, Zuoming , Ma, Ting , Yu, Xingfei , Wang, Qiuwang . Parametric study on thermoelectric power generator and microturbine combined power generation system . | Chemical Engineering Transactions , 2018 , 70 , 61-66 .
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