Superconducting critical temperature is the most attractive material property due to its impact on the applications of electricity transmission,railway transportation,strong magnetic fields for nuclear fusion and medi...
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Superconducting critical temperature is the most attractive material property due to its impact on the applications of electricity transmission,railway transportation,strong magnetic fields for nuclear fusion and medical imaging,quantum computing,*** ability to predict its value is a constant pursuit for condensed matter *** developed a new hierarchical neural network(HNN)AI algorithm to resolve the contradiction between the large number of descriptors and the small number of datasets always faced by neural network AI approaches to materials *** this new HNN-based AI model,a much-increased number of 909 universal descriptors for inorganic compounds,and a dramatically cleaned database for conventional superconductors,we achieved high prediction accuracy with a test R^(2)score of 95.6%.The newly developed HNN model accurately predicted T_(c)of 45 new high-entropy alloy superconductors with a mean absolute percent error below 6%compared to the experimental *** demonstrated a significant potential for predicting other properties of inorganic materials.
High-resolution transmission electron microscopy(HRTEM)promises rapid atomic-scale dynamic structure ***,the precision limitations of aberration parameters and the challenge of eliminating aberrations in Cs-corrected ...
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High-resolution transmission electron microscopy(HRTEM)promises rapid atomic-scale dynamic structure ***,the precision limitations of aberration parameters and the challenge of eliminating aberrations in Cs-corrected transmission electron microscopy constrain resolution.A machine learning algorithm is developed to determine the aberration parameters with higher precision from small,lattice-periodic crystal *** proposed algorithm is then validated with simulated HRTEM images of graphene and applied to the experimental images of a molybdenum disulfide(MoS_(2))monolayer with 25 variables(14 aberrations)resolved in wide *** these measured parameters,the phases of the exit-wave functions are reconstructed for each image in a focal series of MoS_(2)*** images were acquired due to the unexpected movement of the specimen ***-dimensional data extraction reveals time-varying atomic structures and *** particular,the atomic evolution of the sulfur-vacancy point and line defects,as well as the edge structure near the amorphous,is visualized as the resolution has been improved from about 1.75?to 0.9 *** method can help salvage important transmission electron microscope images and is beneficial for the images obtained from electron microscopes with average stability.
Wide field of view and light weight optics are critical for advanced eyewear,with applications in augmented/virtual reality and night *** refractive lenses are often stacked to correct aberrations at a wide field of v...
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Wide field of view and light weight optics are critical for advanced eyewear,with applications in augmented/virtual reality and night *** refractive lenses are often stacked to correct aberrations at a wide field of view,leading to limited performance and increased size and *** particular,simultaneously achieving a wide field of view and large aperture for light collection is desirable but challenging to realize in a compact ***,we demonstrate a wide field of view(greater than 60°)meta-optic doublet eyepiece with an entrance aperture of 2.1 *** the design wavelength of 633 nm,the meta-optic doublet achieves comparable performance to a refractive lens-based eyepiece *** meta-doublet eyepiece illustrates the potential for meta-optics to play an important role in the development of high-quality monochrome near-eye displays and night vision systems.
Thin films of cuprate superconductors are easier to control in terms of doping as compared to bulk samples. However, they require specific substrates to facilitate epitaxial growth. These substrates are often incompat...
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Thin films of cuprate superconductors are easier to control in terms of doping as compared to bulk samples. However, they require specific substrates to facilitate epitaxial growth. These substrates are often incompatible with materials used in electronic applications. Furthermore, it is challenging to separate the substrate's properties from the material of interest. Here, we demonstrate the fabrication of an electron-doped cuprate membrane. We show that the membrane has a coherent crystal structure. Furthermore, the superconducting properties of the membrane postliftoff closely resemble those of the thin films preliftoff, as revealed by a scanning superconducting quantum interference device (SQUID) microscope. Such membranes pave the way for designing new material properties and incorporating complex superconducting materials into typically incompatible electronic devices.
Corrosion of aluminum(Al) alloys during service limits many applications. Micro-arc oxidation(MAO) coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by...
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Corrosion of aluminum(Al) alloys during service limits many applications. Micro-arc oxidation(MAO) coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by mixing a phosphate electrolyte with soluble Zn and Ce salts, zinc phosphate and cerium phosphate co-doped MAO corrosion-resistant coating is prepared on Al alloy LY12. Zinc phosphate and cerium phosphate are incorporated in situ to form an amorphous encapsulated nanocrystalline structure. During long-term corrosion, Zn2+is released and deposited as corrosion products Zn(OH)2to cover weak corrosion micro-regions in the coating. Simultaneously, Ce3+released from MAO coating co-doped with zinc phosphate/cerium phosphate forms Zn(OH)2/Ce(OH)3due to the small solubility product Kspto further enhance corrosion resistance. Compared to pristine Al alloy,corrosion potential increases from -1.306 to -0.819 VSCE, and corrosion current density decreases by 4 orders of magnitude from 2.6 × 10-6to 2.5 × 10-10A·cm-2. Co-doped MAO coating significantly enhances corrosion resistance of Al alloy LY12 and shows great potential for a wide range of applications.
In this study, numerical models of surface plasmon polaritons at the indium antimonide (InSb)–black phosphorus (BP) planar interface are analyzed to explore the influence of carrier density, temperature, and the numb...
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作者:
Xing YunKewen ZhangZhaojun ChuBeitao LiuYan KouXigao JianZhihuan WengState Key Laboratory of Fine Chemicals
Frontiers Science Center for Smart Materials Oriented Chemical Engineering Liaoning Technology Innovation Center of High Performance Resin Materials Department of Polymer Science & Engineering Dalian University of Technology Thermochemistry Laboratory
Liaoning Province Key Laboratory of Thermochemistry for Energy and Materials Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences
Heteroatom-doped porous carbon materials have been widely studied due to their high specific surface area and high heteroatom content,but it is difficult to achieve high specific surface area and high heteroatom conte...
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Heteroatom-doped porous carbon materials have been widely studied due to their high specific surface area and high heteroatom content,but it is difficult to achieve high specific surface area and high heteroatom content at the same ***,a simple method is introduced to prepare N/O co-doped hierarchical porous carbon materials(DNZKs).Phthalonitrile resins(DNZs) were prepared by using 1,3-bis(3,4-dicyanophenoxy)benzene as raw material and ZnCl2/urea as composite curing agent,and then using KOH as activator to successfully prepare DNZKs with high specific surface area,developed pores and high N/O *** porous carbon material(DNZK@400) obtained at a curing temperature of 400℃ has the highest N content(4.97%(mass)),a large specific surface area(2026 m2·g-1),a high micro pore proportion(0.9),a high O content(7.53%(mass)),and the best specific capacitance(up to567 F·g-1at 0.1 A·g-1),which can be attribute to the high temperature resistance of the nitrogencontaining aromatic heterocyclic structure in *** the mass ratio of resin and KOH is 1:1,the specific capacitance of the sample tested by the acid three-electrode system is obtained,and it is found that the material has high cycling stability(119% specific capacitance retention after 100,000 cycle tests).This work proposes a simple and easy-to-operate method for the preparation of multifunctional porous carbon.
Establishing supply chains for future ammonia energy systems requires the development of efficient materials and processes for ammonia production under mild *** researches disclose unique functionalities of binary alk...
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Establishing supply chains for future ammonia energy systems requires the development of efficient materials and processes for ammonia production under mild *** researches disclose unique functionalities of binary alkali and alkaline earth metal hydrides in mediating ammonia *** to the rich compositional and structural properties of the metalhydrogen system,we herein report that LiBaH_(3),as a narrow band gap perovskite hydride,exhibits a strong response to visible light ***,hydridic hydrogen undergoes reductive elimination of producing H_(2)and creates an electron-rich *** an environment favors dinitrogen fixation to form N-H *** on this chemical property,a chemical looping ammonia synthesis process mediated by LiBaH_(3)and driven by both photo and thermal energies was proposed and *** work demonstrates that hydride perovskites are promising candidates for mediating photo-assisted nitrogen fixation reactions.
The development of high-strain piezoelectric materials has presented a longstanding challenge,particularly in the development of high-strain polycrystalline lead-free piezoelectric thin *** this work,we present a stra...
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The development of high-strain piezoelectric materials has presented a longstanding challenge,particularly in the development of high-strain polycrystalline lead-free piezoelectric thin *** this work,we present a strategy for customizing the electrostrain in lead-free thin films through phase transition *** this study,we achieved a high recoverable electrostrain in a Bi_(1/2)Na_(1/2)TiO_(3)–BiAlO_(3)(BNT–BA)*** accomplish this,ferroelectric BNT and BNT–BA films with identical thicknesses of 500 nm were fabricated on Pt(111)/TiO_(2)/SiO_(2)/Si(100)substrates via a sol-gel *** with the BNT film,the BNT–BA film exhibited a greater polarization response and superior field strength endurance,maintaining the energy storage density beyond the breakdown field strength of the *** BNT–BA film demonstrated a large unipolar strain of S=0.43%with a normalized strain(maximum strain/maximum applied electric field(S_(max)/E_(max)))of 203 pm/V,followed by an effective transverse piezoelectric coefficient(e∗31,f)of~2.48 C/m^(2),which was more than two times greater than the value obtained for BNT(i.e.,maximum strain/maximum applied electric field(S_(max)/E_(max))=72 pm/V and e^(∗)_(31,f)of~1.09 C/m^(2)).This high strain response in the BNT–BA film can be attributed to the electric-field-induced phase transition of the mixed(i.e.,cubic and rhombohedral)phases into rhombohedral and tetragonal phases(mainly the rhombohedral structure),which recover back to the original state when the electric field is *** findings suggest new pathways for achieving significant strain levels via alternative mechanisms,potentially enhancing the effectiveness and expanding the applications of piezoelectric materials.
High performance dielectric resonator(DR) bandpass filters(BPFs) are critical components in modern RF/microwave front-end systems due to their many distinctive advantages like low loss, small size, light weight, and t...
High performance dielectric resonator(DR) bandpass filters(BPFs) are critical components in modern RF/microwave front-end systems due to their many distinctive advantages like low loss, small size, light weight, and temperature-stable properties. In recent years, the rapid development of various wireless communication techniques is demanding much more critical specifications for microwave BPFs with better performance but further reduced loss, size, and *** a prospective approach to meet these stringent requirements, BPFs using triple-mode DRs are attracting much attention from both academia and industry [1–5].
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