Polymers with particle inclusions have wide applications,and the mechanical properties of polymer composites affect their reliability in service.The strength of these composites is dependent on factors such as particl...Polymers with particle inclusions have wide applications,and the mechanical properties of polymer composites affect their reliability in service.The strength of these composites is dependent on factors such as particle fraction,size,distribution,and interface interaction between the two phases,in addition to the properties of the polymers and particles.The size effect of particles and interface damage play an important role and thus draw considerable attention.In this paper,the size-and interface-dependent strength of polypropylene(PP)with nano/micro silica(SiO_(2))particles of different fractions is studied through a combination of tensile experiments on a series of samples and corresponding three-dimensional(3D)finite element modeling.The results indicate that PP with 2%SiO_(2)nanoparticles of 50 nm exhibits relatively higher tensile strength,shedding light on the microstructure mechanism where smaller particle sizes lead to better interface bonding.Furthermore,the particle size and interface coupling effect is analyzed based on the size-dependent elastic modulus model and the interface-cohesive model.The simulation demonstrates the local interface damage evolution around a particle of the composites in tension.These findings are beneficial for designing polymer composites with nanoparticle inclusions.展开更多
Electrolytic conductivity, viscosity and electrochemical behavior were investigated for organic electrolytes based on PC（Propylene carbonate）, MAN（Methoxy acetonitrile） and GBL（γ-Butyrolactone） solvents. It was...Electrolytic conductivity, viscosity and electrochemical behavior were investigated for organic electrolytes based on PC（Propylene carbonate）, MAN（Methoxy acetonitrile） and GBL（γ-Butyrolactone） solvents. It was found that 1 mol/L Et4NBF4-MAN had the highest conductivity, lowest viscosity and acceptable potential window. The specific capacitance and energy density obtained from the capacitor using 1 mol/L Et4NBF4-MAN as electrolyte were the highest among all the tested electrolytes.（1 mol/L） Et4NBF4-GBL also seemed promising to be used in electric double-layer capacitor （EDLCs）.展开更多
Multilayers consisting of bilayer alternation of hemicyanine dye and cadmium stearate have been prepared by the Langmuir-Blodgett technique.x-ray diffraction and optical absorption spectra are used to characterixe thl...Multilayers consisting of bilayer alternation of hemicyanine dye and cadmium stearate have been prepared by the Langmuir-Blodgett technique.x-ray diffraction and optical absorption spectra are used to characterixe thleir periodic structures and optical properties.The results show that a well ordered superlattice is produced and the hemicyanine dye is in non-aggregated formation in the alternating multilayers.展开更多
In this work we introduce the“Extensible Fish-tank Volume Model”that can reduce the complexity in the design and control of the Recirculating Aquaculture Systems.In the developed model we adjust the volume of a sing...In this work we introduce the“Extensible Fish-tank Volume Model”that can reduce the complexity in the design and control of the Recirculating Aquaculture Systems.In the developed model we adjust the volume of a single fish-tank to the prescribed values of stocking density,by controlling the necessary volume in each time step.Having developed an advantageous feeding,water exchange and oxygen supply strategy,as well as considering a compromise scheduling for the fingerling input and product fish output,we divide the volume vs.time function into equidistant parts and calculate the average volumes for these parts.Comparing these average values with the volumes of available tanks,we can plan the appropriate grades.The elaborated method is a good example for a case,where computational modeling is used to simulate a‘‘fictitious process model”that cannot be feasibly realized in the practice,but can simplify and accelerate the design and planning of real world processes by reducing the complexity.展开更多
A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity...A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence level for the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,respectively.This is the first reported search for the Z→D^(0)γ decay,while the upper limit on the W+→D+sγbranching fraction improves upon the previous best limit.展开更多
基金sponsored by the National Natural Science Foundation of China(Grant Nos.12172035,92160203,and 91860102)the fundamental Research Funds for the Central Universities of China(buctrc201930).
文摘Polymers with particle inclusions have wide applications,and the mechanical properties of polymer composites affect their reliability in service.The strength of these composites is dependent on factors such as particle fraction,size,distribution,and interface interaction between the two phases,in addition to the properties of the polymers and particles.The size effect of particles and interface damage play an important role and thus draw considerable attention.In this paper,the size-and interface-dependent strength of polypropylene(PP)with nano/micro silica(SiO_(2))particles of different fractions is studied through a combination of tensile experiments on a series of samples and corresponding three-dimensional(3D)finite element modeling.The results indicate that PP with 2%SiO_(2)nanoparticles of 50 nm exhibits relatively higher tensile strength,shedding light on the microstructure mechanism where smaller particle sizes lead to better interface bonding.Furthermore,the particle size and interface coupling effect is analyzed based on the size-dependent elastic modulus model and the interface-cohesive model.The simulation demonstrates the local interface damage evolution around a particle of the composites in tension.These findings are beneficial for designing polymer composites with nanoparticle inclusions.
文摘Electrolytic conductivity, viscosity and electrochemical behavior were investigated for organic electrolytes based on PC（Propylene carbonate）, MAN（Methoxy acetonitrile） and GBL（γ-Butyrolactone） solvents. It was found that 1 mol/L Et4NBF4-MAN had the highest conductivity, lowest viscosity and acceptable potential window. The specific capacitance and energy density obtained from the capacitor using 1 mol/L Et4NBF4-MAN as electrolyte were the highest among all the tested electrolytes.（1 mol/L） Et4NBF4-GBL also seemed promising to be used in electric double-layer capacitor （EDLCs）.
基金Supported by the National Natural Science Foundation of China。
文摘Multilayers consisting of bilayer alternation of hemicyanine dye and cadmium stearate have been prepared by the Langmuir-Blodgett technique.x-ray diffraction and optical absorption spectra are used to characterixe thleir periodic structures and optical properties.The results show that a well ordered superlattice is produced and the hemicyanine dye is in non-aggregated formation in the alternating multilayers.
基金The research is supported by the Bilateral Chinese-Hungarian project in the frame of TE´T_12_CN-1-2012-0041 project.
文摘In this work we introduce the“Extensible Fish-tank Volume Model”that can reduce the complexity in the design and control of the Recirculating Aquaculture Systems.In the developed model we adjust the volume of a single fish-tank to the prescribed values of stocking density,by controlling the necessary volume in each time step.Having developed an advantageous feeding,water exchange and oxygen supply strategy,as well as considering a compromise scheduling for the fingerling input and product fish output,we divide the volume vs.time function into equidistant parts and calculate the average volumes for these parts.Comparing these average values with the volumes of available tanks,we can plan the appropriate grades.The elaborated method is a good example for a case,where computational modeling is used to simulate a‘‘fictitious process model”that cannot be feasibly realized in the practice,but can simplify and accelerate the design and planning of real world processes by reducing the complexity.
文摘A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence level for the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,respectively.This is the first reported search for the Z→D^(0)γ decay,while the upper limit on the W+→D+sγbranching fraction improves upon the previous best limit.
