Designing novel nonfullerene acceptors(NFAs)is of vital importance for the development of organic solar cells(OSC).Modification on the side chain and end group are two powerful tools to construct efficient ***,based o...
详细信息
Designing novel nonfullerene acceptors(NFAs)is of vital importance for the development of organic solar cells(OSC).Modification on the side chain and end group are two powerful tools to construct efficient ***,based on the high-performance L8BO,we selected 3-ethylheptyl to substitute the inner chain of 2-ethylhexyl,obtaining the backbone of *** we introduced different halogen atoms of fluorine and chlorine on 2-(3-oxo-2,3-dihydro-1Hinden-1-ylidene)malononitrile end group(EG)to construct efficient NFAs named BON3-F and BON3-Cl,*** donor D18 was chosen to combine with two novel NFAs to construct OSC ***,D18:BON3-Cl-based device shows a remarkable power conversion efficiency(PCE)of 18.57%,with a high open-circuit voltage(V_(OC))of 0.907 V and an excellent fill factor(FF)of 80.44%,which is one of the highest binary PCE of devices based on D18 as the ***,BON3-F-based device shows a relatively lower PCE of 17.79%with a decreased FF of 79.05%.The better photovoltaic performance is mainly attributed to the red-shifted absorption,higher electron and hole mobilities,reduced charge recombination,and enhanced molecular packing in the D18:BON3-Cl ***,we performed stability tests on two binary systems;the D18:BON3-Cl and D18:BON3-F devices maintain 88.1%and 85.5%of their initial efficiencies after 169 h of storage at 85°C in an N2-filled glove box,*** work demonstrates the importance of selecting halogen atoms on EG and provides an efficient binary system of D18:BON3-Cl for further improvement of PCE.
This paper describes the design and analysis of a flexible microstrip patch antenna for wireless applications that uses reduced graphene oxide (rGO) material deposition on cotton substrates. Using a microstrip line-fe...
详细信息
Investigating the interaction between purge flow and main flow in gas turbines is crucial for optimizing thermal management,and enhancing aerodynamic *** the high-speed rotating rotor poses challenges;however,employin...
详细信息
Investigating the interaction between purge flow and main flow in gas turbines is crucial for optimizing thermal management,and enhancing aerodynamic *** the high-speed rotating rotor poses challenges;however,employing the pre-swirl method to model rotational effect can facilitate experimental *** study evaluates the validity of the pre-swirl method for modeling rotational *** simulations are conducted under both stationary conditions,with seven swirl ratios,and rotational *** investigation focuses on the underlying mechanisms of pre-swirl and ***-swirl and rotation impart circumferential velocity to the purge flow relative to the blade,resulting in a diminishing effect on endwall *** the other hand,pre-swirl reduces the adverse pressure gradient,and the rotation generates Coriolis forces acting on the passage vortex,both contribute to an increasing effect on endwall *** pre-swirl condition,the diminishing effect is dominant,while in rotational condition,neither the diminishing nor the increasing effect exhibits an overwhelmingly dominant trend.
Cu-rich cell boundary phase is difficult to precipitate evenly,resulting in a generally poor demagnetization curve squareness for Fe-rich Sm_(2)Co_(17)-type magnet,which is a key factor limiting the further improvemen...
详细信息
Cu-rich cell boundary phase is difficult to precipitate evenly,resulting in a generally poor demagnetization curve squareness for Fe-rich Sm_(2)Co_(17)-type magnet,which is a key factor limiting the further improvement of magnetic energy *** this study,we report that nanoscale strip-like ordered micro-domains distributed in1:7H disordered matrix phase of the solid solution precursor is a new factor significantly affecting the precipitation and distribution of the cell boundary *** strip-like and continuous micro-twin structure with twin boundaries neatly perpendicular to the C-axis is observed after sintering *** solution treatment,sequential and long strip-like micro-twins gradually transform into disordered state along the basal plane,forming narrow disordered 1:7H(TbCu_(7)-type structure)phase between the separated strip-like ordered *** disordering transformation takes place via broken down of the long strip-like ordered micro-domains,which is accomplished by narrowing along the width direction followed by reduction of the ***,a new model revealing the effect of the ordered micro-domains on the formation of the cell boundary phase is *** boundaries enriched in Cu have already existed in the precursor with long strip-like ordered ***,the Cu-rich cell boundary phase acting as strong pinning centers cannot be precipitated homogeneously and distributed continuously after aging,resulting in a poor demagnetization curve squareness of Sm_(2)Co_(17)-type *** results indicate that significant broken down of the nanoscale ordered micro-domains in solution precursor is the key factor improving the distribution of cell boundary phase in Sm_(2)Co_(17)-type magnets.
It is well known that single-atom catalysts(SACs)have become a hot topic in the field of catalysis due to their advantages such as 100%metal atom utilization efficiency,high catalytic activity and selectivity compared...
详细信息
It is well known that single-atom catalysts(SACs)have become a hot topic in the field of catalysis due to their advantages such as 100%metal atom utilization efficiency,high catalytic activity and selectivity compared with conventional catalysts and ***,the isolated metal atoms on SACs have thermodynamic instability and tend to agglomerate,which limit their catalytic ***,it is of great significance to synthesize stable and high-loading single-atom catalysts(HLSACs).In this paper,we review the research progress of HLSACs from two aspects:design and ***,we comprehensively introduce the synthesis strategies of HLSACs,namely,top-down and bottom-up ***,we overview the application status of HLSACs in three fields:electrocatalysis,thermal catalysis and ***,we summarize the development prospects and challenges of HLSACs.
Seeking an Egyptian real estate industry receptive to real-time interactive design, this study departs from static 3D renders to enhance user engagement. Advanced interactive design walkthrough prototypes, integrated ...
详细信息
Magnetic refrigeration(MR)technology is regarded as an ideal solution for cryogenic applications,relying on magnetocaloric materials which provide necessary chilling effect.A series of polycrystalline Tm_(1-x)Er_(x)Ni...
详细信息
Magnetic refrigeration(MR)technology is regarded as an ideal solution for cryogenic applications,relying on magnetocaloric materials which provide necessary chilling effect.A series of polycrystalline Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds was synthesized,and their magnetic properties,magnetic phase transition together with magnetocaloric effect(MCE)were *** Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds display a field-induced metamagnetic transition from antiferromagnetic(AFM)to ferromagnetism(FM)in excess of 0.2 T,***,the AFM ground state is *** the field change of 0-2 T,the values of maximal magnetic entropy change(-ΔS_(M)^(max))and refrigerant capacity(RC)for Tm_(0.8)Er_(0.2)Ni_(2)Si_(2)compound are 17.9 J/(kg·K)and 83.5 J/kg,*** large reversible MCE under low magnetic fields(≤2 T)indicates that Tm_(0.8)Er_(0.2)Ni_(2)Si_(2)compound can serve as potential candidate materials for cryogenic magnetic refrigeration.
This technical note presents a practical approach to low-energy Earth–Moon transfer autonomous guidance considering high-fidelity orbital ***,autonomous guidance,delineated as a trajectory-tracking problem,is address...
详细信息
This technical note presents a practical approach to low-energy Earth–Moon transfer autonomous guidance considering high-fidelity orbital ***,autonomous guidance,delineated as a trajectory-tracking problem,is addressed within the framework of a predesigned reference trajectory solution,accompanied by empirical trajectory correction maneuver allocation.A series of two-point boundary value problems is subsequently formulated to incorporate guidance velocity *** algorithm employing quasilinearization,discretization,and recursion is proposed to address these boundary value problems,which results in enhanced convergence performance compared with traditional differential-correction-based guidance ***,a Monte Carlo analysis demonstrates the efficacy of the proposed autonomous guidance approach,indicating its potential for onboard applications.
To match the trans-lunar injection with high accuracy,a near-optimal orbit control method for phasing loops is *** analysis was performed based on Gauss’s variational equations,and a near-optimal orbit control strate...
详细信息
To match the trans-lunar injection with high accuracy,a near-optimal orbit control method for phasing loops is *** analysis was performed based on Gauss’s variational equations,and a near-optimal orbit control strategy was developed.A sequential shooting method was proposed to reduce the dimensions of each shooting problem and improve *** satisfy the accessibility requirements of ground facilities,a maneuvering location adjustment strategy is *** advantage of the delta-V saving of the near-optimal method was verified by comparing with the differential correction *** robustness of the practical method was verified using Monte Carlo simulations with high-fidelity *** results of this study can be applied to midcourse correction of phasing loops before the trans-lunar injection of a lunar probe.
Frustrated lanthanide oxides with dense magnetic lattice and suppressed ordering temperature have potential applications in cryogenic magnetic ***,the crystal structure,magnetic properties,magnetic phase transition(MP...
详细信息
Frustrated lanthanide oxides with dense magnetic lattice and suppressed ordering temperature have potential applications in cryogenic magnetic ***,the crystal structure,magnetic properties,magnetic phase transition(MPT)together with magnetocaloric effect(MCE)of LnOF(Ln=Gd,Dy,Ho,and Er)compounds were *** study shows that these compounds crystallize in the centrosymmetric space group R3m with an ideal triangular *** long-range magnetic ordering is observed above 2 K for LnOF(Ln=Gd,Ho,and Er).However,DyOF compound undergoes an MPT from paramagnetic(PM)to antiferromagnetic(AFM)at the Neel temperature(TN≈4 K).Considerable reversible MCE is observed in these triangular-lattice *** the magnetic field change(μ0ΔH)of 0-2 T,the maximum values of magnetic entropy change(-ΔSMmax)of them are 6.1,9.4,12.7,and 14.1 J/(kg·K),***,the value of ErOF with Ising-like spin is 2.3 times that of GdOF,which provides an approach for exploring magnetic refrigerants with excellent low-field cryogenic magnetocaloric effect.
暂无评论