Shi‐Jin Ding
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View article: Tietze Extension Does Not Always Work in Constructive Mathematics If Closed Sets Are Defined as Sequentially Closed Sets
Tietze Extension Does Not Always Work in Constructive Mathematics If Closed Sets Are Defined as Sequentially Closed Sets Open
We prove that Tietze Extension does not always exist in constructive mathematics if closed sets on which the function we are extending are defined as sequentially closed sets. Firstly, we take a discrete metric space as our topological spa…
View article: Zirconium‐Rich Strategy in Ultrathin Hf <sub>0.5</sub> Zr <sub>0.5</sub> O <sub>2</sub> toward Back‐End‐of‐Line‐Compatible Ferroelectric Random Access Memory
Zirconium‐Rich Strategy in Ultrathin Hf <sub>0.5</sub> Zr <sub>0.5</sub> O <sub>2</sub> toward Back‐End‐of‐Line‐Compatible Ferroelectric Random Access Memory Open
HfO 2 ‐based ferroelectric devices have garnered lots of attention in embedded memory due to its exceptional complementary metal oxide semiconductor (CMOS) compatibility as well as sub‐10 nm scalability. Nevertheless, challenges such as do…
View article: Tietze extension does not always work in constructive mathematics if closed sets are defined as sequentially closed sets
Tietze extension does not always work in constructive mathematics if closed sets are defined as sequentially closed sets Open
We prove that Tietze Extension does not always exist in constructive mathematics if closed sets on which the function we are extending are defined as sequentially closed sets. Firstly, we take a discrete metric space as our topological spa…
View article: Defect‐Free Block Copolymer‐Based Distributed Bragg Reflector for Optimized Light Harvesting in BiVO <sub>4</sub> Photoanodes
Defect‐Free Block Copolymer‐Based Distributed Bragg Reflector for Optimized Light Harvesting in BiVO <sub>4</sub> Photoanodes Open
Near‐bandgap photon recycling via distributed Bragg reflector (DBR) offers a promising strategy for maximizing light‐harvesting efficiency of photoelectrochemical (PEC) cells with the minimum charge recombination. However, most DBR films r…
View article: Global well-posedness of 2D incompressible MHD equations without magnetic diffusion
Global well-posedness of 2D incompressible MHD equations without magnetic diffusion Open
In recent years, the global existence of classical solutions to the Cauchy problem for 2D incompressible viscous MHD equations without magnetic diffusion has been proved in \cite{Ren,TZhang}, under the assumption that initial data is close…
View article: NTIRE 2025 Challenge on Efficient Burst HDR and Restoration: Datasets, Methods, and Results
NTIRE 2025 Challenge on Efficient Burst HDR and Restoration: Datasets, Methods, and Results Open
This paper reviews the NTIRE 2025 Efficient Burst HDR and Restoration Challenge, which aims to advance efficient multi-frame high dynamic range (HDR) and restoration techniques. The challenge is based on a novel RAW multi-frame fusion data…
View article: Compact polarization transformation-enabled on-chip delay line for frequency-swept laser nonlinearity calibration
Compact polarization transformation-enabled on-chip delay line for frequency-swept laser nonlinearity calibration Open
An on-chip optical delay line with low-loss and compact waveguide configurations is a crucial component for functional photonic integrated circuits, such as optical coherence tomography, optical gyroscopes, and frequency-modulated continuo…
View article: Designing Laves-phase RFe2-type alloy with excellent magnetostrictive performance by physics-informed interpretable machine learning
Designing Laves-phase RFe2-type alloy with excellent magnetostrictive performance by physics-informed interpretable machine learning Open
Laves-phase RFe2-type (R = rare earth) magnetostrictive materials have tremendous application potential in smart devices. However, efficiently unearthing novel RFe2-type compounds with huge magnetostriction in experiments remains challenge…
View article: Enhancement of Electrical Safe Operation Area of 60 V nLDMOS by Engineering of Reduced Surface Electrical Field in the Drift Region
Enhancement of Electrical Safe Operation Area of 60 V nLDMOS by Engineering of Reduced Surface Electrical Field in the Drift Region Open
To enhance the electrical safe operation area (eSOA) of laterally diffused metal oxide semiconductor (LDMOS) transistors, a novel reduced surface electric field (Resurf) structure in the n-drift region is proposed, which was fabricated by …
View article: A Method for Fast Au-Sn Bonding at Low Temperature Using Thermal Gradient
A Method for Fast Au-Sn Bonding at Low Temperature Using Thermal Gradient Open
Flip chip bonding technology on gold–tin (Au-Sn) microbumps for MEMS (Micro Electro Mechanical Systems) and 3D packaging is becoming increasingly important in the electronics industry. The main advantages of Au-Sn microbumps are a low elec…
View article: A Study on the Harmonic Distortion of Seismic-Grade Sigma-Delta MEMS Accelerometers Using a Multiple Degree-of-Freedom Model
A Study on the Harmonic Distortion of Seismic-Grade Sigma-Delta MEMS Accelerometers Using a Multiple Degree-of-Freedom Model Open
Harmonic distortion is one of the dominant factors limiting the overall signal-to-noise and distortion ratio of seismic-grade sigma-delta MEMS accelerometers. This study investigates harmonic distortion based on the multiple degree-of-free…
View article: A Fast Weight Control Strategy for Programmable Linear RAM Based on the Self-Calibrating Erase Operation
A Fast Weight Control Strategy for Programmable Linear RAM Based on the Self-Calibrating Erase Operation Open
Computing-in-memory (CIM) has attracted great attention due to the need for breaking through the “memory wall”. Programmable linear random-access memory (PLRAM) for high-precision weight control is proposed to tear down the wall. However, …
View article: Multiple-Degree-of-Freedom Modeling and Simulation for Seismic-Grade Sigma–Delta MEMS Capacitive Accelerometers
Multiple-Degree-of-Freedom Modeling and Simulation for Seismic-Grade Sigma–Delta MEMS Capacitive Accelerometers Open
The high-order mechanical resonances of the sensing element in a high-vacuum environment can significantly degrade the noise and distortion performance of seismic-grade sigma–delta MEMS capacitive accelerometers. However, the current model…
View article: High Performance On-Chip Energy Storage Capacitors with Plasma-Enhanced Atomic Layer-Deposited Hf0.5Zr0.5O2/Al-Doped Hf0.25Zr0.75O2 Nanofilms as Dielectrics
High Performance On-Chip Energy Storage Capacitors with Plasma-Enhanced Atomic Layer-Deposited Hf0.5Zr0.5O2/Al-Doped Hf0.25Zr0.75O2 Nanofilms as Dielectrics Open
Concurrently achieving high energy storage density (ESD) and efficiency has always been a big challenge for electrostatic energy storage capacitors. In this study, we successfully fabricate high-performance energy storage capacitors by usi…
View article: Global-in-$x$ stability of Prandtl layer expansions for steady magnetohydrodynamics flows over a moving plate
Global-in-$x$ stability of Prandtl layer expansions for steady magnetohydrodynamics flows over a moving plate Open
In this paper, we obtain the global-in-$x$ Sobolev stability of Prandtl layer expansions for 2-D steady incompressible MHD flows with shear outer ideal MHD flows $(1,0,σ,0)$ ($σ\geq 0$) on a moving plate. It is worth noticing that in the S…
View article: Superhigh energy storage density on-chip capacitors with ferroelectric Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub>/antiferroelectric Hf<sub>0.25</sub>Zr<sub>0.75</sub>O<sub>2</sub> bilayer nanofilms fabricated by plasma-enhanced atomic layer deposition
Superhigh energy storage density on-chip capacitors with ferroelectric Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub>/antiferroelectric Hf<sub>0.25</sub>Zr<sub>0.75</sub>O<sub>2</sub> bilayer nanofilms fabricated by plasma-enhanced atomic layer deposition Open
The ferroelectric Hf 0.5 Zr 0.5 O 2 /antiferroelectric Hf 0.5 Zr 0.5 O 2 bilayer nanofilms are fabricated by plasma-enhanced atomic layer deposition for on-chip energy storage capacitors, demonstrating a superhigh energy storage density of…
View article: Strong Solutions for 1D Compressible Navier-Stokes/Allen-Cahn System with Phase Variable Dependent Viscosity
Strong Solutions for 1D Compressible Navier-Stokes/Allen-Cahn System with Phase Variable Dependent Viscosity Open
This paper is concerned with a non-isentropic compressible Navier-Stokes/Allen-Cahn system with phase variable dependent viscosity $η(χ)=χ^α$ and temperature dependent heat-conductivity $κ(θ)=θ^β$. We show the global existence of strong so…
View article: Flexible <scp>3D</scp> memristor array for binary storage and multi‐states neuromorphic computing applications
Flexible <span>3D</span> memristor array for binary storage and multi‐states neuromorphic computing applications Open
The demand of flexible neuromorphic computing electronics is increasing with the rapid development of wearable artificial intelligent devices. The flexible resistive random‐access memory (RRAM) is one excellent candidate of high‐density st…
View article: Spectrum projection with a bandgap-gradient perovskite cell for colour perception
Spectrum projection with a bandgap-gradient perovskite cell for colour perception Open
Optoelectronic devices for light or spectral signal detection are desired for use in a wide range of applications, including sensing, imaging, optical communications, and in situ characterization. However, existing photodetectors indicate …
View article: Enhanced dissipation and transition threshold for the 2-D plane Poiseuille flow via resolvent estimate
Enhanced dissipation and transition threshold for the 2-D plane Poiseuille flow via resolvent estimate Open
In this paper, we study the transition threshold problem for the 2-D Navier-Stokes equations around the Poiseuille flow $(1-y^2,0)$ in a finite channel with Navier-slip boundary condition. Based on the resolvent estimates for the linearize…
View article: Wearable Heterosynapses: Ultralow Power Wearable Heterosynapse with Photoelectric Synergistic Modulation (Adv. Sci. 8/2020)
Wearable Heterosynapses: Ultralow Power Wearable Heterosynapse with Photoelectric Synergistic Modulation (Adv. Sci. 8/2020) Open
In article number https://doi.org/10.1002/advs.201903480, Lin Chen, Qing‐Qing Sun, and co‐workers present a wearable 2D artificial heterosynapse for simulating multi‐terminal correlations in biology with two modulation modes–an electronic …
View article: Temperature-stable black phosphorus field-effect transistors through effective phonon scattering suppression on atomic layer deposited aluminum nitride
Temperature-stable black phosphorus field-effect transistors through effective phonon scattering suppression on atomic layer deposited aluminum nitride Open
Black phosphorus (BP) shows great potential in electronic and optoelectronic applications; however, maintaining the stable performance of BP devices over temperature is still challenging. Here, a novel BP field-effect transistor (FET) fabr…