10,620 results match your criteria: "Beihang University.[Affiliation]"

ω Meson from Lattice QCD.

Phys Rev Lett

November 2024

Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany.

Many excited states in the hadron spectrum have large branching ratios to three-hadron final states. Understanding such particles from first principles QCD requires input from lattice QCD with one-, two-, and three-meson interpolators as well as a reliable three-body formalism relating finite-volume spectra at unphysical pion mass values to the scattering amplitudes at the physical point. In this work, we provide the first-ever calculation of the resonance parameters of the ω meson from lattice QCD, including an update of the formalism through matching to effective field theories.

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Genomic insights on cgMLST markers, drug resistance, and urease cluster of strains.

Microbiol Spectr

January 2025

School of Engineering Medicine, Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Interdisciplinary Innovation Institute of Medicine and Engineering, Beihang University, Beijing, China.

Unlabelled: , a significant pathogenic bacterium within the Enterobacteriaceae family, is widely distributed across various natural environments. This study conducted a genomic comparison analysis of 1,267 strains of using extensive genome data from public databases. The objective was to elucidate the pan-genomic structure of , revealing the composition and distribution of core and accessory gene families among different strains.

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Highly Efficient and Stable Perovskite Solar Cells by Introducing a Multifunctional Surface Modulator.

Angew Chem Int Ed Engl

December 2024

Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, Yunnan, P. R. China.

Article Synopsis
  • Researchers present a new strategy using sodium 4,4'-(1,4-phenylenebis(oxy))bis(butane-1-sulfonate) (ZR3) to improve perovskite solar cells (PSCs) by addressing surface defects and ion diffusion issues.* -
  • ZR3 effectively passivates lead-related and halide defects, enhances exciton dissociation, improves energy alignment with the hole transport layer (HTL), and reduces charge recombination.* -
  • This treatment leads to a significant increase in power conversion efficiency (PCE), reaching up to 25.96%, while also enhancing the stability of the solar cells through reduced ion migration and defects.*
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  • The hydraulic secondary regulation drive system uses a hydraulic servo motor for precise position tracking but suffers from issues like high inertia and low damping, which reduce control accuracy.
  • This paper proposes a cascaded control strategy that incorporates adaptive robust control, utilizing a fifth-order model to split the system into inner and outer control loops for better management of uncertainties and disturbances.
  • Experimental results demonstrate that this new method significantly improves position tracking accuracy by 50% to 80% compared to traditional methods, even under varying frequency commands.
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[Tooth Design of Ophthalmic Microsurgical Forceps Based on Minimum Slip Force].

Zhongguo Yi Liao Qi Xie Za Zhi

November 2024

School of Mechanical Engineering and Automation, Beihang University, Beijing, 100083.

This study proposed the use of the minimum slip force as an indicator to measure the clamping ability of microsurgical forceps. By analyzing the minimum slip forces of four typical tooth types of microsurgical forceps, the clamping capacity of each type was evaluated. Among the existing tooth forms, the staggered tooth type exhibited a relatively large minimum slip force.

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  • The study emphasizes the importance of early detection and prediction of Alzheimer's disease using neuroimaging techniques like sMRI for brain structure and rsMEG for brain function.
  • A deep learning-based framework, called InterFusion, successfully combined features from both imaging methods, achieving a classification accuracy of 82.7% in distinguishing between Mild Cognitive Impairment and cognitively healthy individuals.
  • The results show that integrating sMRI and rsMEG improves diagnostic accuracy significantly compared to using either method alone, suggesting a promising direction for Alzheimer's research and diagnostics.
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Nonlinear optical response of strain-mediated gallium arsenide microwire in the near-infrared region.

Nanophotonics

May 2024

Shandong Engineering Research Center of New Optoelectronic Information Technology and Devices, School of Mathematics and Physics, Qingdao University of Science & Technology, Qingdao 266061, China.

Article Synopsis
  • Gallium arsenide (GaAs) microwires, with an average diameter of 1.1 μm, have been successfully grown and show promise for nonlinear optical devices by allowing for bandgap engineering.
  • The microwires exhibit significant strain, measured between 1.61% to 2.03%, which reduces their bandgap compared to bulk GaAs, extending the operational wavelength range to 1.1 μm.
  • These GaAs microwires function as effective saturable absorbers in laser applications, demonstrating capabilities like Q-switching and mode-locking in Yb-bulk lasers, highlighting their potential for advanced optical technologies.
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Arsenic in the flue gas has been widely reported as a common poison for SCR catalysts; however, an appropriate coping strategy is still lacking to improve the arsenic resistance performance. Herein, a unique AsO/CeO interface is constructed to transform arsenic from poison into active site with balanced acid-redox property, successfully achieving efficient NO removal. The optimized AsO/CeO exhibits high NO removal efficiency, four times that of the As-poisoned VO/TiO catalyst, and even comparable to the state-of-the-art SCR catalysts.

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Chlorophyll-Inspired Magnesium Porphyrin Array Membrane for Vis-Light-Enhanced Osmotic Energy Conversion.

ACS Appl Mater Interfaces

December 2024

Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.

Osmotic energy, a renewable clean energy, can be directly converted into electricity through ion-selective membranes. Inspired by the magnesium porphyrin (Mg) in plant chlorophyll, which absorbs vis-light and promotes photoelectric conversion, we demonstrate a Mg array membrane, realizing vis-light-enhanced ion transport regulation ability and osmotic energy conversion. The Mg arrays are self-assembled by a Mg-cored block copolymer under the coordination effect of block copolymer self-assembly and Mg π-π stacking, providing chloride-selective transport channels.

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  • This study focuses on developing a method to differentiate between pure uric acid stones and other types of urinary stones using computed tomography (CT) imaging.
  • Researchers analyzed clinical data and CT images from patients at a urology department to create a deep learning model that evaluates the chemical composition of stones.
  • The model achieved high accuracy (97.01%) in predicting stone types, demonstrating its potential as a quick and effective diagnostic tool for urinary stone disease.
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From the noise-assisted perspective of stochastic resonance (SR), fractional system has been adopted to enhance the diagnostic performance of mechanical faults by utilizing the previous state information in mechanical degradation process, but the computation is extremely time-consuming. To address this challenge, we develop a fast diagnosis method leveraging the mechanism of generalized SR (GSR)-based active energy conversion in fluctuating-damping fractional oscillator (FDFO). Through the analysis of system stationary response, we propose a theoretical index known as fault feature amplification (FFA), which effectively replaces the time-consuming numerical solution in multi-parameter optimization, leading to a remarkable reduction in the time complexity of the adaptive diagnosis algorithm.

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  • Polarization photodetectors (pol-PDs) are essential for various fields like geological remote sensing and biological medicine, but existing commercial versions are bulky and slow due to their complex optical systems.
  • A new single-shot pol-PD inspired by desert ants features a compact design with four-directional grating arrays and a perovskite single-crystal thin film, eliminating the need for traditional polarization optics.
  • This innovative pol-PD significantly outperforms commercial models in detectivity and sensitivity, showcasing its potential in applications such as bionic navigation, image restoration in foggy conditions, stress visualization of materials, and identifying cancerous tissues without staining.
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A Record-High Cryogenic Magnetocaloric Effect Discovered in EuCl Compound.

J Am Chem Soc

December 2024

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.

Adiabatic demagnetization refrigeration (ADR) based on the magnetocaloric effect (MCE) is a promising technique to achieve cryogenic temperature. However, magnetic entropy change (Δ), the driving force of ADR, remains far below theoretical -Δ = ln(2 + 1)/ for most magnetic refrigerants. Here, we report giant MCE in orthorhombic EuCl, where a ferromagnetic ground state with excellent single-ion behavior of Eu and free spins has been demonstrated by combining calculations with Brillouin function analysis and magnetic measurements.

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The composition and source information of the aquatic dissolved organic matter (DOM) in the Daihai Lake, a typical saline lake at the ecologically fragile agro-pastoral area, were explored with three-dimensional excitation and emission matrix fluorescence (3DEEM), parallel factor analysis (PARAFAC), and fluorescence peaks (B, T, A, M, C, D, and N). Further, the relationship between aquatic DOM fluorescence characteristics and environmental factors were analyzed using correlation analysis in the Daihai Lake. The results showed that the water of Daihai was weakly alkaline, with high nutrient salt concentration and serious organic pollution.

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Article Synopsis
  • The study focuses on detecting multijet signatures from proton-proton collisions at a high energy of 13 TeV, analyzing a dataset totaling 128 fb^{-1}.
  • A special data scouting method is utilized to pick out events with low combined momentum in jets.
  • This research is pioneering in its investigation of electroweak particle production in R-parity violating supersymmetric models, particularly examining hadronically decaying mass-degenerate higgsinos, and it broadens the limits on the existence of R-parity violating top squarks and gluinos.
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Simulation study on hydrogen concentration distribution in hydrogen blended natural gas transportation pipeline.

PLoS One

December 2024

Pneumatic and Thermodynamic Energy Storage and Supply Beijing Key Laboratory, Beijing, China.

Hydrogen is a clean energy source, and blending it with natural gas in existing pipeline networks is a key transition solution for transportation cost reduction. However, during the transportation process, a non-uniform distribution of hydrogen concentration occurs in the pipeline due to gravity. Therefore, it is necessary to study the hydrogen concentration distribution law of hydrogen-blended natural gas in pipelines.

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According to the cross-distribution of four control points of the minimum zone circle, the four-point conditions that two control points on the circumscribed circle and two control points on the inscribed circle meet are proposed. Based on these conditions, a two-point method is proposed, which is suitable not only for the determination of two control points on the circumscribed circle but also for the determination of two control points on the inscribed circle. In the iterative process, redundant data points can be simply determined by using dichotomy in order to improve computational efficiency.

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CO-Tolerant Heterogeneous Ruthenium Catalysts for Efficient Formic Acid Dehydrogenation.

Angew Chem Int Ed Engl

December 2024

Leibniz-Institut für Katalyse e. V., Albert-Einstein-Str. 29a, Rostock, D-18059, Germany.

The development of improved and less costly catalysts for dehydrogenation of formic acid (HCOOH) is of general interest for renewable energy technologies involving hydrogen storage and release. Theoretical calculations reveal that ruthenium (Ru) nanoparticles supported on nitrogen-doped carbon should be appropriate catalysts for such transformations. It is predicted that nitrogen doping significantly decreases the formation of CO, but at the same time increases CO tolerance of the catalysts.

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Collective properties of Petitella georgiae in tube environments.

Sci Rep

December 2024

The School of Automation Science and Electrical Engineering, Beihang University, Beijing, 100191, China.

The movement of biological swarms is widespread in nature, and collective behavior enhances a swarm's adaptability to its environment. However, most research focuses on free swarm movement, overlooking the impact of environmental constraints such as tubes. This study examines the swimming behavior of Petitella georgiae through a tube.

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In this paper, we present the latest version 3.0.0 of EvoMaster, an open-source search-based fuzzer aimed at Web APIs.

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An innovative CRISPR/Cas9 mouse model of human isolated microtia indicates the potential contribution of CNVs near HMX1 gene.

Int J Pediatr Otorhinolaryngol

December 2024

Auricular Plastic and Reconstructive Surgery Center, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100144, China. Electronic address:

Background: Microtia is a prevalent congenital malformation, the precise etiology and pathogenesis of which remain elusive. Mutations in the non-coding region of the HMX1 gene have been implicated in isolated cases of microtia, emerging as a significant focus of contemporary research. Several pathogenic copy number variations (CNVs) proximal to the HMX1 gene have been documented in wild animal populations, whereas only a single large segmental duplication in this region has been identified in humans.

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Objective: This study aimed to introduce a novel artificial intelligence (AI)-based robotic system for autonomous planning of spinal posterior decompression and verify its accuracy through a cadaveric model.

Methods: Seventeen vertebrae from 3 cadavers were included in the study. Three thoracic vertebrae (T9-11) and 3 lumbar vertebrae (L3-5) were selected from each cadaver.

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The human visual system's adaptability to varying brightness levels has inspired the development of optoelectronic neuromorphic devices. However, achieving bidirectional photoresponse, essential for mimicking these functions, often requires high operation voltages or high light intensities. Here, we propose a bidirectional ZnO/CsPbBr heterostructure based neuromorphic image sensor array (10 × 10 pixels) capable of ultraweak light stimulation.

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Adaptive output feedback fault-tolerant control for a class of nonlinear systems based on a sensor fusion mechanism.

ISA Trans

November 2024

School of Energy and Power Engineering, Beihang University, Beijing, 100191, China. Electronic address:

This paper investigates an output feedback adaptive fault-tolerant tracking control for a class of nonlinear systems with system nonlinearities, sensor failures and external disturbances, in which sensor redundancy is employed to enhance measurement reliability. A sensor fusion mechanism, together with a novel history-based weighted average algorithm is first designed to fuse all sensor outputs. Then, an adaptive controller based on the sensor fusion output, a dynamic gain and a state observer is constructed to handle all the uncertainties caused by system nonlinearities, external disturbances, sensor failures and fusion mechanism.

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JOURNAL/nrgr/04.03/01300535-202510000-00024/figure1/v/2024-11-26T163120Z/r/image-tiff The presence of endogenous neural stem/progenitor cells in the adult mammalian brain suggests that the central nervous system can be repaired and regenerated after injury. However, whether it is possible to stimulate neurogenesis and reconstruct cortical layers II to VI in non-neurogenic regions, such as the cortex, remains unknown.

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