检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Watmanee, Suthasinee Klinaubol, Thitikarn Nganglumpoon, Rungkiat Pinthong, Piriya Serraon, Ace Christian Chiong, Meliton Romero Morikawa, Yoshitada Panpranot, Joongjai Center of Excellence on Catalysis and Catalytic Reaction Engineering Biorefinery Cluster Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Graphene Electronics Research Unit Faculty of Science Chulalongkorn University Bangkok10330 Thailand CrystalLyte Co. Ltd. Research Unit 904 Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Department of Precision Science and Technology and Applied Physics Osaka University Osaka Japan Bio-Circular-Green-economy Technology & Engineering Center BCGeTEC Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand

Formation of nanocrystalline carbon allotropes via the electrocatalytic reduction reaction of CO2 (CO2RR) on the dendritic Ag electrocatalysts was investigated at the applied potential -1.6 V vs. Ag/AgCl under the electrolyte system containing [BMIM]+[BF4]-, propylene carbonate, and water. The surface Ag-O bonds play an important role in developing the N+ stabilized highly energetic negatively charged Ag nanoclusters on which the nanocrystalline solid carbon was formed. Herein, the surface-bonded oxygen on dendritic Ag particles was originated from (i) the ultrathin natural silver oxide layers (unmodified Ag), (ii) anodization treatment (AD), and (iii) cyclic voltammetry treatments at a scan rate 1 (CV1) or 200 mV/s (CV200) for 5 cycles. Their capability to catalyze CO2RR towards solid carbon products depends on the stabilization of the active state of negatively charged nascent Ag nanoclusters under [BMIM]+[BF4]-. Even though each catalytic system yielded a major crystalline solid carbon product, a slight shift towards gaseous CO formation was noted in the case of AD compared to the unmodified Ag, CV200, and CV1, respectively. The increased intricacy in the three-dimensional structure of dendritic Ag particles following CV1 post-treatment, coupled with a stronger Ag-O bond could hinder agglomeration of anion Ag clusters. The crystalline solid carbon films containing sp2-sp3 hybridization were grown on the facets of Ag nanocrystals as the building blocks and were matched with graphite and Diamond-C structures. The discoveries have significance in propelling the progress of electrocatalysts containing oxides, aiming to attain enhanced yields of higher value nanocrystalline carbon products through CO2RR. © 2023, The Authors. All rights reserved.

关键词： Cyclic voltammetry

来源：评论

学校读者我要写书评

暂无评论

EFFICIENT GPU IMPLEMENTATION OF RANDOMIZED SVD AND ITS APPLICATIONS

arXiv

引用

arXiv 2021年

作者： Struski, Lukasz Spurek, Przemyslaw Morkisz, Pawel Bernabeu, Samuel Rodriguez Trzcinski, Tomasz Faculty of Mathematics and Computer Science Jagiellonian University Kraków Poland NVIDIA Corp. Santa Clara United States AGH University of Science and Technology Faculty of Applied Mathematics Kraków Poland

Matrix decompositions are ubiquitous in machine learning, including applications in dimensionality reduction, data compression and deep learning algorithms. Typical solutions for matrix decompositions have polynomial complexity which significantly increases their computational cost and time. In this work, we leverage efficient processing operations that can be run in parallel on modern Graphical Processing Units (GPUs), predominant computing architecture used e.g. in deep learning, to reduce the computational burden of computing matrix decompositions. More specifically, we reformulate the randomized decomposition problem to incorporate fast matrix multiplication operations (BLAS-3) as building blocks. We show that this formulation, combined with fast random number generators, allows to fully exploit the potential of parallel processing implemented in GPUs. Our extensive evaluation confirms the superiority of this approach over the competing methods and we release the results of this research as a part of the official CUDA implementation1 © 2021, CC BY.

关键词： Eigenvalues and eigenfunctions

来源：评论

学校读者我要写书评

暂无评论

Let Images Speak More: An Efficient Method for Detecting Image Manipulation History

引用

IEEE Transactions on Circuits and Systems for Video technology 2025年

作者： Wei, Yang Liu, Haowei Yuan, Xiaochen Bi, Xiuli Xiao, Bin Chongqing University of Posts and Telecommunications Department of Computer Science and Technology Chongqing China Macao Polytechnic University Faculty of Applied Sciences Macao China

Digital image forensics aims to verify the authenticity of digital images, which has emerged as a prominent research area. To reveal the manipulation history of an image, the existing methods can only detect specific image operations or are based on a general forensic feature with high dimensions. Moreover, these methods perform well only when the operation chain length is no greater than 2. However, their detection accuracy drops significantly for images with longer operation chains that are more representative of real-world scenarios. To break these limitations, we proposed a novel forensics frequency Feature based on Histogram and Detail Map (FHDM(79D)), which can distinguish various operation chains containing different numbers of operations. Specifically, compared to the traces left by image manipulation in the spatial domain, we have discovered that they are more distinct in the frequency domain. This observation has prompted us to extract features from the frequency domain of images by analyzing their histograms and detail maps to capture the manipulation traces of the images. Notably, the proposed feature extracted in the frequency domain has almost 90% fewer dimensions than the commonly used general forensic features, such as SRM(714D), which greatly reduces the computational complexity. Meanwhile, compared to deep learning-based methods, the experiments show that the proposed method achieves a detection accuracy of over 95% for image operations across multiple datasets, while other deep learning-based methods do not exceed 90% accuracy. Extensive experimental results show that the proposed method is more versatile and effective, showing good performance in complex operation chain detection and local forgery detection. The code is available at https://***/CherishL-J/Op-detection. © 1991-2012 IEEE.

关键词： computer forensics

来源：评论

学校读者我要写书评

暂无评论

Structural, Optical and Electrical Characterizations of Cr-doped CuO Thin Films

Research Square

引用

Research Square 2021年

作者： Baturay, Silan Candan, Ilhan Ozaydin, Cihat Dicle University Faculty of Science Department of Physics Diyarbakir21280 Turkey Dicle University Institute of Science and Technology Department of Physics Diyarbakir21280 Turkey Department of Computer Engineering Faculty of Engineering University of Batman Batman72100 Turkey

The polycrystalline copper oxide (CuO) thin films have been produced using method of spin coating onto the soda lime glass (SLG) as well as substrate of p-type Si (1 0 0) wafers at 500 ºC in furnace. The obtained undoped and Cr doped thin films of CuO have been comprehensively characterized via X-ray diffraction (XRD), ultraviolet–vis (UV–vis) spectroscopy, the current–voltage (I–V) and capacitance–voltage (C–V) characteristics for providing information on quality of the crystalline nature, change in energy band gap and electrical properties, respectively. Structural analysis results which obtained from XRD data demonstrate that CuO films conjunction with Cr doping indicated that all thin films have monoclinic polycrystalline nature, with two main peaks (002) and (111) with dhkl about 2.52 and 2.32 Å, respectively. The transmittance and energy band gap value of undoped and Cr doped thin films of CuO ranging in varying concentration ratio have been determined in the wavelength region of 300 to 1100 nm. UV–vis spectrum analysis results indicate that both transmittance value and energy band gap of the CuO films is changed with increasing Cr doping ratio in CuO solution at room temperature. The I–V and C–V characteristic of Cr:CuO/p-Si diodes were associated with the CuO/p-Si diodes. It is seen that doping of Cr had a significant change onv the obtained devices’ performance. Thus, the Cr:CuO/p-Si diodes generated by 1% Cr doping using spin coating method had the highest light sensitivity compared with those of the other diodes. © 2021, CC BY.

关键词： Thin films

来源：评论

学校读者我要写书评

暂无评论

Study of Isomeric Yield Ratio of the 184m,Gre Isomeric Pair in the Natre(Γ,Xn)184m,Gre Reactions

SSRN

引用

SSRN 2023年

作者： Nguyen, Van Do Nguyen, Thanh Luan Nguyen, Thi Hien Pham, Duc Khue Bui, Thi Hoa Kim, Guinyun Institute of Theoretical and Applied Research Duy Tan University Hanoi100000 Viet Nam Faculty of Natural Sciences Duy Tan University Da Nang550000 Viet Nam Institute of Physics Vietnam Academy of Science and Technology 10 Dao Tan Hanoi10000 Viet Nam Center for High Energy Physics Kyungpook National University Daegu41566 Korea Republic of Institute for Nuclear Science and Technology VINATOM 179 Hoang Quoc Viet Hanoi Viet Nam VNU University of Science Vietnam National University 334 Nguyen Trai Str. Hanoi Viet Nam

We measured the isomeric yield ratio of the 184m,gRe isomeric pair produced in the natRe(γ,xn)184m,gRe reactions using the activation method combined with residual activity measurements. The experiments were carried out at the bremsstrahlung end-point energies of 50, 60, and 70 MeV. During data analysis, efforts were made to separate overlapping γ-rays, subtract activity contributions from radioactive precursors, and correct for counting losses due to attenuation of γ-rays in the sample. Isomeric yield ratios were also calculated using the statistical nuclear model code TALYS-1.96/2.0, taking into account the effect of the input-level structure of the product nucleus. The present results are the first measurement at bremsstrahlung end-point energies beyond the Giant Dipole Resonance energy range. © 2023, The Authors. All rights reserved.

关键词： Gamma rays

来源：评论

学校读者我要写书评

暂无评论

2D multiple waves scattering for active detection of a dummy human body in a low frequency range and for various boundary conditions 12

2D multiple waves scattering for active detection of a dummy...

引用

12th International Conference on Mathematical Modeling in Physical sciences, IC-MSQUARE 2023

作者： Bibcu, Dorin Florescu Culea, Anisia Moldovanu, Simona Moraru, Luminita The Modelling & Simulation Laboratory University "Dunǎrea de Jos" of Galati 47 Domneasca Street Galati800008 Romania University "Dunǎrea de Jos" of Galati Business Administration Department 59-61 N. Balcescu St. Galati800001 Romania Department of Electronics and Telecommunications Faculty of Automation Computers Electrical Engineering and Electronics Galati University "Dunǎrea de Jos" of Galati 47 Domneasca Str. Galati800008 Romania Department of Computer Science and Information Technology Faculty of Automation Computers Electrical Engineering and Electronics University 'Dunǎrea de Jos' of Galati 47 Domneasca Street Galati800008 Romania Department of Chemistry Physics & Environment Faculty of Sciences and Environment University "Dunǎrea de Jos" of Galati 47 Domneasca Street Galati800008 Romania

This paper investigates the results of simulations devoted to the acoustic field variation caused by different boundary conditions applied to the backscattering of the acoustic wave in both low and moderately low frequency ranges. The goal is to analyse the object behaviour and the detection ability of the 2D acoustic field approximations when the simulation data of the scattered sound field is available. The plane waves are backscattered by a dummy human body, positioned in a cabin which has a defined size. The dummy human body is created by using clusters of finite and disjointed but tangent circular cylinders. Each cylinder is a scatterer that emulates various boundary conditions i.e., the scatterers can be sound-soft (Dirichlet boundary condition) and sound-hard scatterers (Neumann boundary condition). The cylinders are filled with biological tissue (i.e., fat). The exterior scattering problem is solved using the preconditioned Krylov subspace iterative solvers (GMRES), as a computationally cheaper alternative. We use the hypothesis that the mass density of the obstacle and wave speed in the obstacle are both constant. During the simulation experiments, we neglected the interactions among scatterers. A frequency range from 100 Hz to 1000 Hz is analysed. Both the Sound Pressure Level (SPL) and Radar Cross Section (RCS) are used to analyse the numerical simulation of the sound field. © 2024 Institute of physics Publishing. All rights reserved.

关键词： Acoustic fields

来源：评论

学校读者我要写书评

暂无评论

Light Curve Modeling of Eclipsing Binary Systems with Delta Scuti Component

arXiv

引用

arXiv 2025年

作者： Dharmathilaka, J.A.D.M. Adassuriya, J. Jayaratne, K.P.S.C. Gutiérrez, Jordi L. Department of Physical Sciences and Technology Faculty of Applied Sciences Sabaragamuwa University of Sri Lanka Belihuloya Sri Lanka Astronomy and Space Science Unit Department of Physics Faculty of Science University of Colombo Sri Lanka Spain

Astroseismology in eclipsing binaries with Delta (δ) Scuti components offers a powerful means to derive stellar parameters and probe internal structures. To enable accurate frequency analysis, binary characteristics must be disentangled from the observed light curves. This study utilizes the LC2015 light curve modeling method, followed by the DC2015 differential correction process, integrated into the Wilson-Devinney (WD) eclipsing binary modeling code. The analysis focuses on two δ Scuti binary systems, KIC 8504570 and SX DRACONIS (Dra), using Kepler and TESS photometric data, supplemented by literature-derived initial stellar parameters. The DC2015 process employs the Levenberg-Marquardt algorithm to minimize the difference between observed and modeled light curves. The refined models provide highly accurate stellar parameters, including primary and secondary star temperatures (Teff,1 and Teff,2), mass ratio (q), and primary star luminosity (L1) with associated errors. For KIC 8504570: Teff,1 (7400.9 ± 1.6) K, Teff,2 (5450.4 ± 1.0) K, q (0.5208 ± 0.0002), and L1 (11.8043 ± 0.0006)L☉. For SX Dra: Teff,1 (7729.7 ± 1.1) K, Teff,2 (4927.5 ± 0.5) K, q (0.4772 ± 0.0006), and L1 (7.0474 ± 0.0015)L☉ © 2025, CC BY.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Origin of surface-bonded oxygen on dendritic Ag particles towards 3D-nanocrystalline carbon formation via CO2 electrochemical reduction reaction

SSRN

引用

SSRN 2023年

关键词： Cyclic voltammetry

来源：评论

学校读者我要写书评

暂无评论

Rapid and efficient characterization of cervical collagen orientation using linearly polarized colposcopic images

引用

Journal of Innovative Optical Health sciences 2023年第5期16卷 21-31页

作者： Cat Phan Ngoc Khuong Dung Nguyen Huu Quang Hai Pham Thanh Long Nguyen Quynh Nguyen Ngoc Duc Le Huynh Tien Tran Van Tu Ly Anh Department of Applied Physics Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street District 10 Ho Chi Minh City 700000Vietnam Quality Management Department Tu Du Hospital 284 Cong QuynhDistrict 1 Ho Chi Minh City 700000Vietnam Department of Biomedical Engineering Nguyen Tat Thanh University 300A Nguyen Tat Thanh District 4Ho Chi Minh City 700000Vietnam Faculty of Science and Technology Jean Monnet University 11 Rue du Docteur Annino Saint Etienne 42000France

Collagen provides tissue strength and structural *** fication of the orientated dispersion of collagen fibers is an important factor when studying the mechanical properties of the *** this study,for the first time,a new method for rapid characterization of the collagen fiber orientations of the cervix using linearly polarized light colposcopy is presented.A total of 24 colposcopic images were captured using a cross-polarized imaging system with white LED light *** the preprocessing stage,the Red channel of the RGB image was chosen,which contains no information of the blood vessels because of the low-absorption of blood cells in the red ***,which is an ImageJ plug-in,was used to estimate the local orientation of the collagen *** result shows that in the nonpregnant cervix,the middle zone(Zone 2)has circumferentially aligned collagen fibers while the inner zone(Zone 1)has randomly *** collagen fiber dispersion in Zone 2 is much smaller than that in Zone 1 at all four quadrants region(anterior,posterior,left,and right quadrant).This new analysis technique could potentially combine with diagnostic tools to provide a quantitative platform of collagen fibers in the clinic.

关键词： Cervix collagen fibers collagen orientation coherency cross-polarized imaging colposcopy

来源：评论

学校读者我要写书评

暂无评论

Graphene Oxide Boosted: A Multifaceted Examination of Czts Composite for Enhanced Photocatalysis and Antimicrobial Efficacy

SSRN

引用

SSRN 2023年

作者： Cavusoglu, Halit Ibrahim, Marwah Ali Sakalak, Hüseyin Günes, Erdogan Uysal, Ahmet Çıtak, Emre Öztürk, Teoman Department of Physics Faculty of Science Selcuk University Konya42130 Turkey Advanced Nanotechnology Research Laboratory Faculty of Science Selcuk University Konya42130 Turkey Graduate School of Natural and Applied Sciences Nanotechnology and Advanced Materials Selcuk University Konya42130 Turkey Department of Biology Faculty of Science Selcuk University Konya42130 Turkey Department of Medical Services and Techniques Vocational School of Health Services Selcuk University Konya42130 Turkey Chemical Engineering Department Faculty of Engineering and Natural Sciences Konya Technical University Konya42250 Turkey Advanced Technology Research and Application Center Selcuk University Konya42130 Turkey

Because of their acute toxicity and long-lasting effects on the environment, the increasing discharge of organic dyes into water systems from many sources, such as chemical accidents, agricultural runoff, and industrial effluents, has raised concerns around the world. Semiconductor-based photocatalysis has gained prominence for its ability to degrade organic contaminants comprehensively, providing a potential solution to the limitations of the conventional methods. This study addresses the environmental repercussions of dye contamination and explores the utilization of active semiconductor photocatalysts for effective wastewater treatment. Our focus lies in synthesizing CZTS through the hydrothermal route, a method gaining traction for its simplicity and environmental viability. To augment the photocatalytic efficiency of semiconductor materials, graphene oxide (GO) has been introduced with varying GO concentrations of 5% and 10%. Additionally, the study explores the performance of CZTS nanoparticles with varying GO concentrations for antibacterial applications against eight Gram-positive/negative bacterial strains and its catalytic prowess in the photocatalytic degradation of methylene blue dye. © 2023, The Authors. All rights reserved.

关键词： Sewage

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：