Zhejiang University of Technology

This paper develops a practical program of non-heritage images based on AR technology according to the characteristics of AR technology. Screening the non-heritage image sense of place evaluation index and satisfaction test items, respectively, constructs the sense of place mathematical evaluation model and KNO model. Taking the questionnaire data as the entry point, use the model of this paper to jointly explore the non-heritage images based on AR technology.The mean value of the Worse index of the 20 satisfaction test items is -0.3517, and the mean value of the Better index is 0.6626, which proves that the experiencers’ attitude towards the non-heritage images integrating AR technology is basically satisfied.The assessment matrix of sense of place for the AR technology-driven non-heritage images is ( 3.5804, 2.0325, 1.4579, 1.5178, 1.4104), indicating that the performance of AR technology in the sense of place recreation of non-heritage images is excellent.

The selective autoxidation for the synthesis of valuable oxygenates has provoked keen interest from both academic and industrial sectors. Although the generation of reactive oxygen species via oxygen attack on C─H bonds near ester linkages is well‐established, research into aliphatic ester oxidation has primarily focused on combustion, neglecting their potential utility in oxidation processes. Herein, a protocol for producing propylene oxide through the autoxidation of ethyl acetate in tandem with propylene epoxidation is demonstrated. The ethoxy radical, generated by ester C(acyl)─O bond cleavage in situ, subsequently underwent proton‐coupled electron transfer with the Co(OAc)(μ‐H2O)2Ni, followed by the formation of the peracetic acid optimally suited for the epoxidation reaction. The research not only eliminates the need for co‐substrates in the epoxidation process but also fills the application gap in bulk‐ester autoxidation, offering insights into the effective utilization of oxy‐intermediates in autoxidation reactions.

A visible light-driven photocatalytic olefination of alkyl aldehydes into vinylphosphonates directly with alkynylphosphonates has been successfully developed through a P/N-heteroleptic Cu(I)-photosensitizer-enabled, secondary amine-aided tandem radical process comprising in situ generation...

In situHard carbon (HC) is considered to be the most promising anode material for sodium‐ion batteries (SIBs) due to the structural diversity, and low cost. However, limited Na⁺ transfer kinetics and structural defects lead to low initial Coulombic efficiency (ICE) and poor rate performance (typically <5 A g⁻¹) of HC anodes. In this work, an interesting morphology‐induced strategy is reported to synthesize 2D HC material. MXene is introduced into sugar‐derived HC during hydrothermal process. After the subsequent carbonization, the as‐obtained composite (TC5‐1300) inherits the lamellar structure of MXene, and TiC nanoparticles by Ti3C2 MXene reacting with carbon are embedded into carbon layer. This concentrated architecture not only provides a robust scaffold for sodium storage, but also greatly reduces the defects of HC. Therefore, TC5‐1300 maintains a high reversible capacity of 267.28 mA h g⁻¹ after 500 cycles at 2 A g⁻¹ with a high ICE of 86.27%. Attributed to the excellent Na⁺ diffusion ability and interfacial stabilization, TC5‐1300 exhibit a reversible capacity of 194 mA h g⁻¹ even at 8 A g⁻¹. Furthermore, this morphology tailoring strategy can be generalized to other sugar sources derived carbon materials, which provides a valuable solution to commercial development of HC anodes.

Ferroelectric/paraelectric superlattices, created through the periodic stacking of their constituent materials, exhibit intricate phase diagrams that reveal a variety of polar topologies and properties not found in any of the individual components. In this study, the phase‐field simulations are utilized to systematically calculate the phase diagrams of Zr‐rich Pb(Zr, Ti)O3/SrTiO3 superlattices with varying periodicity, strain, and temperature. A rhombohedral‐type labyrinth domain is observed, which is oriented along the [110] direction under relatively low compressive strain. Meanwhile, higher compressive strains lead to the formation of polar skyrmions with shorter periodicities. Notably, a high dielectric permittivity of 1700 is found at room temperature for the polar skyrmion phase with a periodicity of 6 when grown on a DyScO3 substrate, which is double the value for the skyrmion phase in a PbTiO3/SrTiO3 superlattice. Moreover, a phase transition from skyrmion, vortex/labyrinth states to a cubic phase at elevated temperatures is discovered, accompanied by a significant reduction in dielectric responses. It is hoped that the work will inspire further exploration into the design of intriguing polar topologies with superior properties.

Geophysical mass flows often consist of various types of materials with different surface roughnesses. Predicting the dynamics of flows such as rock‐ice avalanches, where particles have highly distinct surface friction, remains challenging due to the limited knowledge on how friction differences impact the rheology and microstructure. To study the flow of surface friction‐different granular mixtures, we conducted discrete element method simulations of dense granular flows with varying concentrations of a highly frictional and a less frictional particle type. Each mixture is characterized by three interparticle friction coefficients defined for contacts between similar and dissimilar particle species. We show that the mixture rheology can be modeled by combining the rheologies of single‐phase flows having interparticle frictions equal to those that exist in the mixture, weighted according to particle contact probabilities. Furthermore, by applying the contact probabilities on a recently developed friction‐dependent constitutive model, it is possible to predict the rheology and micro‐structural parameters of a wide range of mixture scenarios and flow geometries requiring only the interparticle friction coefficients as inputs. Results here improve the determination of the flow resistance due to friction differences in geophysical flows, allowing for more reliable predictions of their dynamics, which in turn are necessary for hazard risk reduction and mitigation.

The experimental realization of single-crystalline high-κ dielectrics beyond two-dimensional (2D) layered materials is highly desirable for nanoscale field-effect transistors (FETs). However, the scalable synthesis of 2D nonlayered high-κ insulators is currently limited by uncontrolled isotropic three-dimensional growth, hampering the achievement of simultaneous high dielectric constants and low trap densities for small film thicknesses. Herein, we show a 2D edge-seeded heteroepitaxial strategy to synthesize ultrathin nonlayered 2D CaNb2O6 nanosheets by chemical vapor deposition, exhibiting high-crystalline quality, thickness-independent dielectric constant (~ 16) and breakdown field strength up to ~ 12 MV cm⁻¹. The MoS2/CaNb2O6 FETs exhibit an on/off ratio of over ~ 10⁷, a subthreshold swing down to 61 mV/dec and a negligible hysteresis. This work suggests a universal 2D edge-seeded heteroepitaxy and slow kinetic strategy for the scalable growth of 2D nonlayered dielectric and demonstrates 2D CaNb2O6 nanosheets as promising dielectrics for facilitating 2D electronic applications.

Whether the removal of regional administrative barriers can effectively coordinate intergovernmental relations and promote green and low-carbon development in border areas has become an important issue. This paper uses data from 285 prefecture-level cities in China from 2006 to 2020 to scientifically identify administrative boundary areas at the township level. It employs a multi-period difference-in-differences approach to examine the impact of the county-to-district policy on carbon emissions in these boundary areas. Our study finds that abolishing county-level administrations and establishing districts significantly reduces carbon emissions in administrative border areas. This effect is achieved by reducing segmentation in both factor and commodity markets. Further analysis reveals that the “proactive adaptation” type of policy has a significant carbon emission reduction effect in administrative border areas. Additionally, the policy is more effective in areas with weaker local government intervention, in eastern regions, and at urban borders. From the perspective of regional integration, this paper explores new pathways to address carbon emission gaps at administrative boundaries, providing theoretical support for strengthening the county-to-district transition and offering new ideas for the governance of carbon emissions in administrative boundary regions.

Arm swing during walking is significant as it enhances gait stability and reduces energy expenditure. Reduced arm swing in patients with Parkinson’s disease (PD) or the elderly causes poor mobility and higher fall risk. This paper develops an IMU-based real-time biofeedback wristband with an automatic sensor-to-segment calibration algorithm for arm swing training. The real-time algorithm detects key frames and calculates the sensor-to-segment alignment transformation, then monitors arm swing motion and provides vibration feedback when insufficient arm swing is detected. Validation experiments were performed to assess the accuracies of arm swing angle, angular velocity estimations, and the effectiveness of real-time biofeedback. Seventeen subjects wore wristbands and optical markers on their arms while performing slow, normal, and fast walking on a treadmill. Arm swing angle, angular velocity, and range of motion were extracted with and without the proposed calibration method. An additional wristband manually aligned with the forearm was used for comparison and an optical motion capture (OMC) system was utilized for reference. For the proposed method with automatic calibration, the root mean square errors (RMSEs) of the estimated continuous swing angle and angular velocity were 2.1° and 12.8°/s, which were 46% and 58% of those estimated with the manually aligned wristband. In real-time feedback experiments, subjects exhibited a notable increase in arm swing amplitude given the stimulus from vibration feedback. The developed wristband could serve as an effective training and easy-to-use device, which has the potential for PD patients to increase their arm swing amplitude during walking.