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3rd IEEE International Conference on Problems of Informatics, Electronics and Radio Engineering, PIERE 2024

作者： Ivanov, Vladislav V. Stepanov, Ivan V. Aleksakina, Yana V. Shaygardanova, Arina R. Khairetdinova, Adelya D. Voronkov, Grigory S. Ufa University of Science and Technology Research Lab. 'Sensor Systems Based on Devices of Integrated Photonics' Ufa Russia

ISBN: (纸本)9798331516321

The paper explores optoelectronic oscillator (OEO) output frequency control by adjusting the integrated optical time delay line in the OEO feedback loop. The developed mathematical model demonstrates the continuous nature of output OEO frequency tuning for the continuous phase incursion change in the OEO feedback loop. We created a photonic integrated circuit (PIC) numerical model for verification in the Ansys Lumerical Software. The PIC is designed for the generic silicon-on-insulator platform. We applied an unbalanced Mach-Zehnder interferometer with tunable couplers as an integrated optical time delay line. Numerical simulations showed that the applied time delay line provides an output OEO frequency change range of 360 MHz within a voltage range from -3.2 to 0.5 V. In this case, the time delay tuning step is 6 ps/V, and the corresponding output frequency step is 30 MHz/ps. For the precision digital-to-analog converter (DAC), an output OEO frequency tuning step is 7.2 kHz for the minimum DAC voltage step 40 μV. © 2024 IEEE.

关键词： Mach-Zehnder interferometers

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Mechanism insight into the enhanced photocatalytic purification of antibiotic through encapsulated architectures coupling of crystalline Cu_(2)O/amorphous TiFe layer double hydroxide

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Journal of Materials science & technology 2023年第36期167卷 161-170页

作者： Lin Ye Shaodong Sun Xiaoli Yang Xiaoxi Chen Bian Yang Daqin Yun Xiaojing Yu Man Yang Qing Yang Shuhua Liang Jie Cui Engineering Research Center of Conducting Materials and Composite Technology Ministry of EducationShaanxi Engineering Research Center of Metal-Based Heterogeneous Materials and Advanced Manufacturing TechnologyShaanxi Province Key Laboratory for Electrical Materials and Infiltration TechnologySchool of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048China College of Energy Xiamen UniversityXiamen 361005China

Amorphous materials are one of the important candidates for improving heterogeneous photocata-lysts because of their unique electronic structures and abundant catalytic sites originating from dis-order atomic ***,there is still much room for the development of new crys-talline/amorphous heterogeneous composites for photocatalytic *** efficient synthetic strategies for preparing new crystalline/amorphous heterojunctions are highly ***,we have realized the deep optimization of photocatalytic activity by fabricating crystalline/amorphous Cu_(2)O/Ti-Fe layer double hydroxide(LDH)*** to the typical Z-scheme mechanism originating from the crystalline/amorphous interfaces,the photocharge separation and catalytic active sites obviously enhance compared to single Cu_(2)O and LDH *** expected,the photocatalytic removal of tetra-cycline(TC)of the as-prepared Cu_(2)O/Ti-Fe LDH was over 5.2 and 2.2 times those of the pristine Cu_(2)O nanospheres and Ti-Fe LDH *** work illustrates the origin of crystalline Cu_(2)O nanospheres encapsulated in amorphous Ti-Fe layer double hydroxide nanosheets for enhanced photocatalytic activity driven by visible light,and provide a general Cu_(2)O-templated solution-phase synthetic method for the synthesis of novel double-metal layer double hydroxide amorphous nanostructures.

关键词： Crystalline Cu_(2)O Amorphous Ti-Fe LDH Z-scheme mechanism Charge separation Photodegradation

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Proton and neutron electromagnetic form factors using Nf=2+1+1 twisted-mass fermions with physical values of the quark masses

arXiv

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arXiv 2025年

作者： Alexandrou, Constantia Bacchio, Simone Koutsou, Giannis Prasad, Bhavna Spanoudes, Gregoris Department of Physics University of Cyprus Cyprus Computation-based Science and Technology Research Center The Cyprus Institute Cyprus

We compute the electromagnetic form factors of the proton and neutron using lattice QCD with Nf = 2 + 1 + 1 twisted mass clover-improved fermions and quark masses tuned to their physical values. Three ensembles with lattice spacings of a=0.080 fm, 0.068 fm, and 0.057 fm, and approximately the same physical volume allow us to obtain the continuum limit directly at the physical pion mass. Several values of the source-sink time separation ranging from 0.5 fm to 1.5 fm are used, enabling a thorough analysis of excited state effects via multi-state fits. The disconnected contributions are analyzed using high statistics for the two-point functions combined with low-mode deflation and hierarchical probing for the fermion loop estimation. We study the momentum dependence of the form factors using the z-expansion and dipole Ansaetze, thereby enabling the extraction of the electric and magnetic radii, as well as the magnetic moments in the continuum limit, for which we provide preliminary results. © 2025, CC BY-NC-ND.

关键词： Fermions

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A covalently integrated ZIF-8/polyamide acid mixed matrix membrane with superior gas separation performance

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Chinese Journal of Chemical Engineering 2024年第12期76卷 30-41页

作者： Guozhen Li Shiqi Ling Yuhui Cui Shilong Dong Tianyin Liu Ting Li Siyu Pang Peiyong Qin National Energy Research and Development Center for Biorefinery College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Bio-Based Fiber Manufacturing Technology China Textile AcademyBeijing 100025China Paris Curie Engineer School Beijing University of Chemical TechnologyBeijing 100029China

Zeolitic imidazolate framework-8(ZIF-8)is a typical filler used to fabricate mixed matrix membranes(MMMs)on account of its attractive advantage of high selective permeability for gas ***,the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers,However,the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers,which will lead to a decrease of selectivity and the performance of gas separation will be strongly ***,we modified ZIF-8 with 3-amino-1,2,4-triazole to obtain ZIF-8-NH_(2),Kapton polyamide acid was selected as the polymer *** showed that the ZIF-8-NH_(2)/Kapton MMMs has a good compatibility interface between ZIF-8 and Kapton because of the covalent bridging,even the filler loading up to 45%(mass).The 45%(mass)of ZIF-8-NH_(2)/Kapton membrane showed 297 barrer(1 barrer=10^(-10)10 cm^(3)·cm·cm^(-2)·s^(-1)·cmHg^(-1),1 cmHg=1333.22 Pa,standard temperature and pressure)of the permeability of H_(2)and 43.9 and 62.2 of selectivities for H_(2)/N_(2)and for H_(2)/CH_(4),respectively,which are beyond the upper limit of Robeson 2008.

关键词： Polyamide acid ZIF-8 Mixed matrix membrane Gas separation

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Unsupervised Sinogram Denoising for Single Photon Emission Computed Tomography

Unsupervised Sinogram Denoising for Single Photon Emission C...

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IEEE Symposium on Nuclear science (NSS/MIC)

作者： C. Chrysostomou The Cyprus Institute Computation-Based Science and Technology Research Cente Nicosia Cyprus

This paper presents a novel methodology for denoising sinograms based on cycle-consistent adversarial networks, focusing on medical imaging applications. The proposed method is designed to denoise sinograms without requiring paired information of low to high levels of noise and uncertainty, which is often difficult to obtain in real-world scenarios. The method was trained on three two sets of projection data from randomly generated software phantoms, using GATE, with various levels of collections time. The denoised and high-collection-time sinograms were then reconstructed and compared using the Ordered Subset Expectation Maximization (OSEM) method, which showed that the proposed method significantly removes noise without impacting the quality of the sinograms and improving the reconstructions. Finally, the method was tested on dopamine transporter imaging with single-photon emission computed tomography (DAT-SPECT) sinograms to demonstrate its effectiveness and capability.

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Advanced Sinogram Reconstruction via Fourier Neural Operators for High-Quality SPECT Imaging

Advanced Sinogram Reconstruction via Fourier Neural Operator...

引用

IEEE Symposium on Nuclear science (NSS/MIC)

作者： C. Chrysostomou Computation-Based Science and Technology Research Cente The Cyprus Institute Nicosia Cyprus

This study introduces an innovative sinogram reconstruction technique employing Fourier neural operators (FNOs) for single-photon emission computed tomography (SPECT) imaging. The proposed method accepts a limited number of sinogram projections and directly reconstructs a superior image without intermediate steps. The approach is trained on a dataset of high-quality SPECT images using FNOs, a category of neural networks capable of learning linear operators through Fourier analysis. The method is assessed using software-generated phantoms via GATE and compared against the standard ordered subsets expectation maximization (OSEM) reconstruction method. The results demonstrate that the proposed method considerably enhances reconstruction quality and surpasses state-of-the-art compressed sensing techniques. The presented method holds the potential to decrease radiation exposure and scanning time required for SPECT imaging, rendering it a valuable asset in clinical practice. Future research could investigate the application of this method to other imaging modalities and advanced neural network architectures.

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Multi-objective evolutionary optimization for hardware-aware neural network pruning

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Fundamental research 2024年第4期4卷 941-950页

作者： Wenjing Hong Guiying Li Shengcai Liu Peng Yang Ke Tang Guangdong Provincial Key Laboratory of Brain-Inspired Inteligent Computation Department of Computer Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Research Institute of Trustworthy Autonomous Systems Southern University of Science and TechnologyShenzhen 518055China Department of Statistics and Data Science Southern University of Science and TechnologyShenzhen 518055China

Neural network pruning is a popular approach to reducing the computational complexity of deep neural *** recent years,as growing evidence shows that conventional network pruning methods employ inappropriate proxy metrics,and as new types of hardware become increasingly available,hardware-aware network pruning that incorporates hardware characteristics in the loop of network pruning has gained growing attention,Both network accuracy and hardware efficiency(latency,memory consumption,etc.)are critical objectives to the success of network pruning,but the conflict between the multiple objectives makes it impossible to find a single optimal *** studies mostly convert the hardware-aware network pruning to optimization problems with a single *** this paper,we propose to solve the hardware-aware network pruning problem with Multi-Objective Evolutionary Algorithms(MOEAs).Specifically,we formulate the problem as a multi-objective optimization problem,and propose a novel memetic MOEA,namely HAMP,that combines an efficient portfoliobased selection and a surrogate-assisted local search,to solve *** studies demonstrate the potential of MOEAs in providing simultaneously a set of alternative solutions and the superiority of HAMP compared to the state-of-the-art hardware-aware network pruning method.

关键词： Multi-objective optimization Evolutionary algorithm Neural network pruning Hardware-awaremachine learning Hardware efficiency

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Long-range electron synergy over Pt_(1)-Co_(1)/CN bimetallic single-atom catalyst in enhancing charge separation for photocatalytic hydrogen production

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Journal of Energy Chemistry 2023年第6期81卷 502-509,I0011页

作者： Man Yang Jing Mei Yujing Ren Jie Cui Shuhua Liang Shaodong Sun Engineering Research Center of Conducting Materials and Composite Technology Ministry of EducationShaanxi Engineering Research Center of Metal-Based Heterogeneous Materials and Advanced Manufacturing TechnologyShaanxi Province Key Laboratory for Electrical Materials and Infiltration TechnologySchool of Materials Science and EngineeringXi’an University of TechnologyXi’an 710048ShaanxiChina Interdisciplinary Research Center of Biology&Catalysis School of Life SciencesNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina

The development of novel single-atom catalysts with optimal electron configuration and economical noble-metal cocatalyst for efficient photocatalytic hydrogen production is of great importance,but still ***,we fabricate Pt and Co single-atom sites successively on polymeric carbon nitride(CN).In this Pt_(1)-Co_(1)/CN bimetallic single-atom catalyst,the noble-metal active sites are maximized,and the single-atomic Co_(1)N_4sites are tuned to Co_(1)N_3sites by photogenerated electrons arising from the introduced single-atomic Pt_(1)N_*** studies and density functional theory(DFT)calculations reveal that the 3d orbitals of Co_(1)N_3single sites are filled with unpaired d-electrons,which lead to the improved visible-light response,carrier separation and charge migration for CN ***,the protons adsorption and activation are *** this advantage of long-range electron synergy in bimetallic single atomic sites,the photocatalytic hydrogen evolution activity over Pt_(1)-Co_(1)/CN achieves 915.8 mmol g^(-1)Pt h^(-1),which is 19.8 times higher than Co_(1)/CN and 3.5 times higher to Pt_(1)/*** this electron-synergistic effect is not so efficient for Pt *** results demonstrate the synergistic effect at electron-level and provide electron-level guidance for the design of efficient photocatalysts.

关键词： Bimetallic single-atom catalyst Long-range electron synergy Charge separation/transfer Carbon nitride Hydrogen production

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Novel approach for computing gradients of physical observables

arXiv

引用

arXiv 2023年

作者： Bacchio, Simone Computation-based Science and Technology Research Center The Cyprus Institute Nicosia Cyprus

We show that an infinitesimal step of gradient flow can be used for defining a novel approach for computing gradients of physical observables with respect to action parameters. Compared to the commonly used perturbative expansion, this approach does not require calculating any disconnected contribution or vacuum expectation value and can provide results up to three orders of magnitudes more precise. On the other hand, it requires a non-trivial condition to be satisfied by the flow action, the calculation of its force and its Laplacian, and the force of the observable, whose gradient needs to be measured. As a proof of concept, we measure gradients in β of Wilson loops in a four-dimensional SU(3) Yang-Mills theory simulated on a 164 lattice using the Wilson action. © 2023, CC BY.

关键词： Lattice theory

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Impact of marine heatwaves and cold spells on coral reef ecosystem in a tropical region: a case study of Lombok Waters, Indonesia

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Marine Systems and Ocean technology 2025年第1期20卷 1-15页

作者： Napitupulu, Gandhi Nagi, Achmad Nurdjaman, Susanna Radjawane, Ivonne Millichristi Rachmayani, Rima Ramadhan, Muhammad Ridwan Nasution, Muhammad Ikram Habibullah, Ahmad Dhuha Kelvin, Filan Muhammad Oceanography Study Program Faculty of Earth Science and Technology Bandung Institute of Technology West Java Cirebon Indonesia Environmental and Applied Oceanography Research Group Faculty of Earth Sciences and Technology Bandung Institute of Technology West Java Bandung Indonesia Master Study Program of Earth Science Faculty of Earth Sciences and Technology Bandung Institute of Technology West Java Bandung Indonesia Korea-Indonesia Marine Technology Cooperation Research Center West Java Cirebon Indonesia Nature Based Solutions Ecosecurities Carouge Switzerland

Coral reefs, vital marine ecosystems, are highly vulnerable to thermal stress-induced bleaching. Regional-scale bleaching events are often triggered by elevated sea surface temperature (SST) associated with global warming. While sustained temperature anomalies exceeding ± 1 °C above the long-term maximum monthly mean can induce bleaching, extreme short-term warming and cooling events, known as marine heatwaves (MHW) and marine cold spells (MCS), respectively, pose significant threats. These events, characterized by prolonged periods of anomalous temperature extremes, can have far-reaching ecological and economic consequences. This study investigated the spatial distribution of MHW and MCS in the Lombok Sea and their relationship with coral bleaching. Using daily SST data from 1998 to 2022, we identified MHW and MCS events and analyzed their frequency, intensity, and duration. Additionally, Landsat imagery (Landsat 5, 6, and 7) and field surveys conducted in 2016 were employed to assess changes in coral cover over time. Our results show that the effect of MCS and MHW cause coral bleaching, particularly in years with high frequency, intensity, and duration of these events. Extreme daily intensity (anomaly of SST > 1.5 °C) of MCS in 2000 and MHW in 1998, 2016, and 2022 led to a significant decrease in coral reef cover of approximately 30%. Furthermore, we observed that large-scale climate patterns such as the El Niño-Southern Oscillation (ENSO) can exacerbate MHW (in 1998 and 2016) conditions and contribute to coral decline. These results underscore the urgent need for effective coral reef management strategies to mitigate climate change and ocean warming impacts. © The Author(s), under exclusive licence to Sociedade Brasileira de Engenharia Naval 2025.

关键词： Reefs

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