摘要：The photocatalytic activity of a semiconductor‐based photocatalyst largely depends on the semiconductor’s intrinsic crystal and electronic *** have prepared two types of La and Cr co‐doped SrTiO3photocatalysts(SrTiO3(La,Cr))using the polymerized complex method(PCM)and sol‐gel hydrothermal method(SHM).Under?>420‐nm visible light irradiation,only the Pt‐loaded SrTiO3(La,Cr)prepared by the SHM showed efficient photocatalytic activities for both H2evolution in the presence of an I?sacrificial reagent and for Z‐scheme overall water splitting when it was coupled with the Pt‐loaded WO3in the presence of I?and IO3?as the shuttle redox *** superior photocatalytic activity of SrTiO3(La,Cr)prepared by the SHM has been ascribed to its more negative conduction‐band position,higher carrier concentration,and higher carrier mobility,demonstrating that the design and synthesis of an H2‐evolution photocatalyst with appropriate electronic properties is crucial for achieving Z‐scheme overall water splitting.

摘要：Cascaded regression has been recently applied to reconstruct 3D faces from single 2D images directly in shape space, and has achieved state-of-the-art performance. We investigate thoroughly such cascaded regression based 3D face reconstruction approaches from four perspectives that are not well been studied： （1） the impact of the number of 2D landmarks; （2） the impact of the number of 3D vertices; （3） the way of using standalone automated landmark detection methods; （4） the convergence property. To answer these questions, a simplified cascaded regression based 3D face reconstruction method is devised. This can be integrated with standalone automated landmark detection methods and reconstruct 3D face shapes that have the same pose and expression as the input face images, rather than normalized pose and expression. An effective training method is also proposed by disturbing the automatically detected landmarks. Comprehensive evaluation experiments have been carried out to compare to other 3D face reconstruction methods. The results not only deepen the understanding of cascaded regression based 3D face reconstruction approaches, but also prove the effectiveness of the proposed method.

摘要：Rational design of solid-state electrolytes(SSEs)with high ionic conductivity and low activation energy(Ea)is vital for all solid-state *** learning(ML)techniques have recently been successful in predicting Li^(+) conduction property in SSEs with various descriptors and accelerating the development of *** this work,we extend the previous efforts and introduce a framework of ML prediction for E_(a) in SSEs with hierarchically encoding crystal structure-based(HECS)*** cubic Li-argyrodites as an example,an Ea prediction model is developed to the coefficient of determination(R^(2))and rootmean-square error(RMSE)values of 0.887 and 0.02 eV for training dataset,and 0.820 and 0.02 eV for test dataset,respectively by partial least squares(PLS)analysis,proving the prediction power of *** variable importance in projection(VIP)scores demonstrate the combined effects of the global and local Li^(+) conduction environments,especially the anion size and the resultant structural changes associated with anion site *** developed E_(a) prediction model directs us to optimize and design new Li-argyrodites with lower Ea,such as Li_(6–x)PS_(5–x)Cl_(1+x)(<0.322 eV),Li_(6+x)PS_(5+x)Br_(1–x)(<0.273 eV),Li_(6+x)PS_(5+x)Br_(0.25)I_(0.75–x)(<0.352 eV),Li_(6+(5–n)y)P_(1–y)N_(y)S_(5)I(<0.420 eV),Li_(6+(5–n)y)As_(1–y)N_(y)S_(5)I(<0.371 eV),Li_(6+(5–n)y)As_(1–y)NySe_(5)I(<0.450 eV),by broadening bottleneck size,invoking site disorder and activating concerted Li+*** analysis shows great potential in promoting rational design of advanced SSEs and the same approach can be applied to other types of materials.

摘要：Emerging quantum dots(QDs)based light-emitting field-effect transistors(QLEFETs)could generate light emission with high color purity and provide facile route to tune optoelectronic properties at a low fabrication *** efforts have been devoted to designing device structure and to understanding the underlying physics,yet the overall performance of QLEFETs remains low due to the charge/exciton loss at the interface and the large band offset of a QD layer with respect to the adjacent carrier transport ***,we report highly efficient QLEFETs with an external quantum efficiency(EQE)of over 20%by employing a dielectric-QDs-dielectric(DQD)sandwich *** DQD structure is used to control the carrier behavior by modulating energy band alignment,thus shifting the exciton recombination zone into the emissive ***,enhanced radiative recombination is achieved by preventing the exciton loss due to presence of surface traps and the luminescence quenching induced by interfacial charge *** DQD sandwiched design presents a new concept to improve the electroluminescence performance of QLEFETs,which can be transferred to other material systems and hence can facilitate exploitation of QDs in a new type of optoelectronic devices.

摘要：Temperature is a significant load on bridges,particularly for long-span steel box girder *** study investigates the temperature-induced static responses of a long-span suspension bridge under real service environmental conditions using numerical simulations and field *** 2 D finite element(FE)models of a typical section for the box girder,main cable,hanger,tower column,and crossbeam are *** thermal boundary conditions are determined strictly according to the surrounding environments of a typical sunny day and applied to the FE models.A transient heat-transfer analysis is performed and the time-dependent temperature and its distribution on the bridge are *** addition,a fine,3 D FE model of the bridge is developed for a structural *** calculated temperatures are applied to the 3 D model and the temperature-induced structural responses are *** simulated temperatures and the associated static responses have good agreement with the measured counterparts and support the numerical simulation *** main cable and bridge deck make the greatest contributions to the temperature effects on the suspension *** static responses of bridge caused by the design vehicle load are also *** daily variation of the temperature-induced static responses is comparable with,even higher than,that of the design vehicle load.

摘要：The thermal expansion coefficient(TEC)and thermal conductivity(k)of thermal fillers are key factors for designing thermal management and thermal protection composite *** to its unique advantages,hexagonal boron nitride(h-BN)is one of the most commonly used thermal ***,its TEC and k values are still unclear due to the inconsistency of characterization techniques and sample *** this work,these disputes were addressed using the quasi-harmonic approximation(QHA)method and phonon Boltzmann transport equation(BTE)theory based on the density functional theory(DFT),*** accuracy of our calculated TEC and k values was confirmed by previously reported experimental results,and the underlying physical principles were analyzed from the phonon *** TEC results show that the h-BN has small in-plane negative value and large cross-plane positive value,which are-2.4×10^(-6) and 36.4×10^(-6) K^(-1) at 300 K,*** the anisotropic TEC is mainly determined by the anisotropic isothermal bulk modulus and the low-frequency out-of-plane longitudinal phonon *** found that the convergence of cutoff radius and q-grid size have significant effect on the accuracy of k of *** results show that the in-plane k is much higher than the cross-plane k,and the values at 300 K are 286.6 and 2.7 W m^(-1) K^(-1),*** anisotropic phonon group velocity arising from the vibration behaviors of acoustic phonon modes should be primarily responsible for the anisotropic *** calculated TEC and k values will provide important references for the design of h-BN composite materials.

摘要：We present a novel method for designing transformation optical devices based on *** arbi-trary transformation of electrostatic field can lead to a new refractive index distribution,where wave-fronts and energy flux lines correspond to equipotential surfaces and electrostatic flux lines,*** to scalar wave propagating exactly following an eikonal equation,wave optics and geometric optics share the same solutions in the *** method is utilized to design multipole lenses derived from multipoles in *** source and drain in optics are considered as corre-sponding to positive charge and negative charge in the static *** defining winding numbers in vir-tual and physical spaces,we explain the reason for some multipole lenses with illusion ***,we introduce an equipotential absorber to replace the drain to correspond to a negative charge with a grounded ***,it is a very general platform to design intriguing devices based on the combination of electrostatics and transformation optics.

摘要：Rationally designed oxygen evolution reaction(OER)catalysts with structural and compositional superiorities are essential for energy-related electrocatalytic ***-metal phosphides have been used as promising electrocatalysts for *** heteroatoms into the lattice can induce lattice distortion and redistribution of electron density,consequently modifying the electronic structure and improving catalytic ***,Fe-and S-substituted Ni_(2)P uniformly dispersed throughout porous carbon substrate(Ni-Fe-P-S@C)was rationally designed through transformation from the pre-synthesized NiFe-metal organic frameworks(NiFe-MOFs)by partial sulfurization and subsequent phosphorization *** results and density functional theory calculations showed that Fe and S incorporation could modulate the electronic structure of Ni_(2)P and alter the adsorption free energies of reaction intermediates,contributing to admirable electrocatalytic activity and stability toward ***,the in-situ formed partially oxidized surface was vital to further improve the local *** proposed cation-and anion-substitution strategy will bring new inspiration to boost the electrocatalytic performance of transition-metal-based electrocatalysts for energy conversion applications.

摘要：This paper proposes a novel collision post structure designed to improve the crashworthiness of subway cab *** structure provides two innovative features:1)a simpler connection between the post and the car roof,which gives a more reasonable load transfer path to reduce the stress concentration at the joint;and 2)a stiffness induction design that provides an ideal deformation model to protect the safe space of the cab *** novel collision post structure was evaluated with finite element analysis,and a prototype cab car was mechanically *** results demonstrate that the deformation response was stable and agreed well with the expected ideal *** maximum load was 874.17 kN and the responses remained well above the elastic design load of 334 kN as required by the design *** addition,there was no significant tearing failure during the whole test ***,the novel collision post structure proposed has met the requirements specified in new standard to improve the crashworthiness of subway cab ***,the energy absorption efficiency and light weight design highlights were also summarized and discussed.

摘要：Although dielectric elastomer(DE)with substantial actuated strain(AS)has been reported 20 years ago,its scientific understanding remains *** most accepted theory of DE,which is proposed in 2000,holds the view that AS of DE is induced by the Maxwell *** to this theory,materials have similar ratios of permittivity and Young’s modulus should have similar AS,while the experimental results are on contrary to this theory,and the experimental AS has no relationship with ideal ***,a new dipole-conformation-actuated strain cross-scale model is proposed,which can be generally applied to explain the AS of DE without *** to this model,several characteristics of an ideal DE are listed in this work and a new DE based on polyphosphazene(PPZ)is *** AS of PPZ can reach 84%without any *** last,a PPZ-based all soft artificial heart(ASAH)is built,which works in the similar way with natural myocardium,indicating that this material has great application potential and possibility in the construction of an ASAH for heart failure(HF)patients.