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The Physical Parameters of EDFA and SOA Optical Amplifiers and Bit Sequence Variations Based Optical Pulse Generators Impact on the Performance of Soliton Transmission Systems

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Journal of Optical Communications 2024年第s1期45卷 s15-s20页

作者： Amiri, I.S. Rashed, Ahmed Nabih Zaki Ramya, K.C. Vinoth Kumar, K. Maheswar, R. Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam Department of Electronics and Electrical Communications Engineering Faculty of Electronic Engineering Menoufia University Menouf Egypt Department of EEE Sri Krishna College of Engineering and Technology Coimbatore India Department of EEE Karunya Institute of Technology and Sciences Coimbatore India School of EEE VIT Bhopal University Bhopal India

This study has outlined the effects of physical parameters of erbium doped fiber amplifier (EDFA), semiconductor optical amplifier (SOA) on the performance of amplified soliton transmission systems. Injection current-based SOA, EDFA length is taken into account. It is observed that the optimum soliton power and signal per noise ratio are achieved with 5m EDFA length and 900mA injection current-based SOA. As well as the bit sequence variations based user defined bit sequence generator are employed in order to measure the soliton transmission system performance. The signal per noise ratio is enhanced with 4 bit sequence. Soliton peak power, output soliton power, and maximum Q-factor are optimized with 8 bit sequence for soliton propagation length of 150km and possible transmission data rates of 160Gb/s. Improvement percentage ratio in soliton peak power by using two amplification techniques a long propagation length is deeply stimulated with optiwave simulation program. © 2019 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Erbium doped fiber amplifiers

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High-performance all-polymer solar cells with only 0.47 eV energy loss

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science China Chemistry 2020年第10期63卷 1449-1460页

作者： Qiang Wu Wei Wang Tao Wang Rui Sun Jing Guo Yao Wu Xuechen Jiao Christoph J.Brabec Yongfang Li Jie Min The Institute for Advanced Studies Wuhan UniversityWuhan 430072China Beijing National Laboratory for Molecular Sciences Beijing 100190China Key Laboratory of Materials Processing and Mold(Ministry of Education) Zhengzhou UniversityZhengzhou 450002China Department of Materials Science and Engineering Monash UniversityAustralian SynchrotronClaytonVictoriaAustralia Institute of Materials for Electronics and Energy Technology(i-MEET) Friedrich-A lexander-Universitat-Erlangen-NiirnbergErlangenGermany

The field of all-polymer solar cells(all-PSCs)has experienced rapid development during the past few years,mainly driven by the development of efficient polymer ***,the power conversion efficiencies(PCEs)of the all-PSCs are still limited by insufficient light absorption of the donor/acceptor blend and large energy loss in *** herein designed a polymer acceptor PYT1 constructed n-type molecular acceptor Y5-C20 as the key building block and blended it with a polymer donor PM6 to obtain an all-polymer photoactive *** optimized PM6:PYT1 all-PSCs achieved a record higher PCE of 13.43%with a very low energy loss of 0.47 eV and a photoresponse of up to 900 nm compared with the Y5-C20 based device with a best PCE of 9.42%.Furthermore,the PCEs of the PM6:PYT1 all-PSCs are relatively insensitive to the 1-chloronaphthalene(CN)additive contents and active layer *** results also highlight the effect of CN additive on PM6:PYT1 morphology,i.e.,charge generation,and transport find an optimized balance,and radiative and non-radiative loss is simultaneously reduced in the *** work promotes the development of high-performance polymer acceptors and heralds a brighter future of all-PSCs for commercial applications.

关键词： all-polymer solar cells polymer acceptor absorption coefficient energy loss mechanical stability

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Carbon-Involved Near-Surface Evolution of Cobalt Nanocatalysts:An in Situ Study

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CCS Chemistry 2021年第11期3卷 154-167页

作者： Feng Yang Haofei Zhao Wu Wang Qidong Liu Xu Liu Yuecong Hu Xinrui Zhang Sheng Zhu Dongsheng He Yingying Xu Jiaqing He Rongming Wang Yan Li Beijing National Laboratory for Molecular Science Key Laboratory for the Physics and Chemistry of NanodevicesState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871 Department of Chemistry Guangdong Provincial Key Laboratory of Catalytic ChemistrySouthern University of Science and TechnologyShenzhenGuangdong 518055 Beijing Advanced Innovation Center for Materials Genome Engineering Center for Green InnovationBeijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083 Department of Physics Southern University of Science and TechnologyShenzhenGuangdong 518055 Core Research Facilities Southern University of Science and TechnologyShenzhenGuangdong 518055

When carbon-containing species are involved in reactions catalyzed by transition metals at high temperature,the diffusion of carbon on or in catalysts dramatically influences the catalytic *** information on the carbon-diffusioninvolved evolution of catalysts at the atomic level is crucial for understanding the reaction mechanism yet also *** the chemical vapor deposition process of single-walled carbon nanotubes(SWCNTs),we recorded in situ the catalyst state(solid and molten)composition as well as near-surface structural and chemical evolution at the cobalt catalyst-tube interface with carbon permeation using aberration-corrected environmental transmission electron microscopy and synchrotron X-ray absorption *** nucleation of SWCNTs was linked with an alternating dissolving and precipitating cycle of carbon in catalysts close to the nucleation *** the dynamics of carbon atoms in catalysts brings deeper insight into the growth mechanism of SWCNTs and facilitates inferring mechanisms of other *** methodologies developed here will find broad applications in studying catalytic and other processes.

关键词： carbon nanotube catalysts chemical vapor deposition structure evolution aberrationcorrected environmental transmission electron microscopy

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Effect of Mn Content on the Microstructural Evolution of a Typical "G-Phase Steel" Alloy System

SSRN

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SSRN 2022年

作者： Yang, Mujin Yang, Zhijie Ke, Dingning Huang, Chao Li, Zhou Wang, Cuiping Liu, Xingjun Department of Materials Science and Engineering Harbin Institute of Technology Guangdong Shenzhen518055 China Department of Mechanical and Energy Engineering Southern University of Science and Technology 1088 Xueyuan Blvd Shenzhen518055 China Institute of Materials Genome and Big Data Harbin Institute of Technology Shenzhen518055 China Education Center of Experiments and Innovations Harbin Institute of Technology Shenzhen518055 China College of Materials Fujian Provincial Key Laboratory of Materials Genome Xiamen University Xiamen361005 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Shenzhen150001 China

Effect of Mn alloying on the microstructural evolution of a classic G-phase enhanced Fe-20Cr-3Ni-3Si-1Ti ferritic alloy was extensively examined using advanced electron microscopy techniques (SEM and TEM) and theoretical predictions (Thermodynamic calculation). Firstly, a ternary precipitating phase named t (Fe 7 TiSi 2 ) which is isotypic to the structure of aMn ( I -43m), existing at high-temperature (~ 1100 o C), was discovered for the first time. Secondly, the ferrite matrix was observed to decompose into the mixture of the martensite, austenite, twin and s-phase at the mid-temperature region (700 ~ 850 o C). Thirdly, the nanosized G-phases were discovered at both the intragranular sites and the grain boundaries after aging at 550 o C, behaving a strong over-aging resistance with the increased Mn content. Finally, phase stabilities of the detected t, s, G, ferrite, martensite and austenite phases with different Mn content were discussed under different annealing temperatures. These findings provide new insight into the exploration of microstructural optimization via optimal annealing and alloy design strategies for G-phase steel. © 2022, The Authors. All rights reserved.

关键词： Titanium alloys

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Pressure-induced anomalous evolution of charge density waves and superconductivity in Bi2Rh3Se2

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Physical Review B 2025年第19期111卷 195160-195160页

作者： Fei Jiao Jiayang Li Shuyang Wang Chao An Min Zhang Xuliang Chen Ying Zhou Lili Zhang Yimin Xiong Yonghui Zhou Ning Hao Zhaorong Yang Anhui Province Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory Chinese Academy of Sciences Hefei Anhui 230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei 230026 China Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China Department of Physics School of Physics and Optoelectronics Engineering Anhui University Hefei 230601 China Hefei National Laboratory Hefei 230028 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Layered parkerite-type ternary chalcogenide Bi2Rh3Se2, featuring one-dimensional (1D) Rh-Rh chains, exhibits the coexistence of bulk superconductivity (SC) and charge-density-wave (CDW) order at ambient pressure. Here, we report an exceptional evolution of CDW and SC in pressurized Bi2Rh3Se2. Upon compression, the CDW demonstrates a dome-shaped behavior that peaks at a critical pressure Pc1 of ∼12 GPa, while the SC concurrently displays a valley-shaped evolution, indicating a competitive relationship between the two electronic orders. Theoretical calculations suggest that the unusual CDW evolution can be attributed to a nonmonotonic variation of the predominant Fermi surface nesting, along with an enhancement of the minority momentum-dependent electron-phonon coupling. Above Pc2∼33GPa, the valley-shaped SC plateaus at the superconducting transition temperature Tc∼2.33K, which can be attributed to a dimensional crossover from a quasi-2D to a 3D structure. Our findings demonstrate that the layered Bi2Rh3Se2 provides an ideal platform for understanding a novel competing pathway between CDW and bulk SC, where the pressure-driven dome-shaped CDW is concurrent with an anticorrelated SC.

关键词： Charge density waves

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Densification behaviors of hydroxyapatite/pectin bio-ceramics

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materials Today: Proceedings 2023年

作者： Teoh, M.W. Ng, C.K. Lee, Sara K.Y. Ramesh, S. Ting, C.H. Chuah, Y.D. Lim, Ignatius Y. Tan, C.Y. Sutharsini, U. Centre for Advanced Materials Department of Materials Engineering Faculty of Engineering and Technology Tunku Abdul Rahman University of Management and Technology 53300 Kuala Lumpur Malaysia Centre of Systematic Innovation Research Department of Mechanical Engineering Faculty of Engineering and Technology Tunku Abdul Rahman University of Management and Technology 53300 Kuala Lumpur Malaysia Centre of Advanced Manufacturing and Material Processing Department of Mechanical Engineering Faculty of Engineering University of Malaya 50603 Kuala Lumpur Malaysia Universiti Tenaga Nasional Putrajaya Campus Jalan IKRAM-UNITEN 43000 Kajang Selangor Malaysia Huanghe Jiaotong University Zhengzhou 454950 Henan Province P.R. China of Engineering Universiti Teknologi Brunei Tungku Highway Gadong BE1410 Brunei Darussalam Department of Mechanical and Materials & Manufacturing Engineering Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman Jalan Sungai Long Bandar Sungai Long Cheras Kajang 43000 Malaysia Department of Mechanical Material and Manufacturing Engineering Faculty of Engineering University of Nottingham 43500 Semenyih Selangor Darul Ehsan Malaysia Department of Physics University of Jaffna Jaffna JA 40000 Sri Lanka

Hydroxyapatite (HA) is a popular biomaterial in making implants and bone grafts owing to its high biocompatibility and close resemblance to human bone. This study aims to determine the physiochemical and mechanical properties of HA derived from chicken bones (CHA) through calcination. Microwave irradiation-extracted pectin was ball-milled with CHA. Pure CHA and CHA added with pectin (CHAP) were sintered via conventional and two-step sintering. FTIR and XRD peaks confirmed the presence of HA and β-tricalcium phosphate in CHA and CHAP. SEM image of CHA and CHAP powder exhibited 0.5-0.625 μm rod-shaped and spherical particles, with 2-8 μm grains after sintering. Ca/P ratios of CHA and CHAP fell between 1.47 and 1.85. The highest relative density and hardness of sintered samples achieved are 96.66% and 4.76 GPa, respectively. This proves that the calcination of chicken bones can produce HA which is suitable for biomedical applications. © 2023 Elsevier Ltd. All rights reserved.

关键词： Hydroxyapatite

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Continuous flowing polarization system containing absorbents for acceleration of absorption of oil-in-water micelles in water by electric dipole moments

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Journal of Water Process engineering 2024年 58卷

作者： Chen, Chih-Wei Cheng, Chih-Chia Chang, Chi-Jung Chen, Jem-Kun Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Sec. 4 Keelung Road Taipei 106 Taiwan Department of Occupational Safety and Health/Institute of Industrial Safety and Disaster Prevention College of Sustainable Environment Chia Nan University of Pharmacy and Science Tainan 717 Taiwan Division of Neurosurgery Department of Surgery Chi Mei Medical Center Tainan 710 Taiwan Graduate Institute of Applied Science and Technology and Advanced Membrane Materials Research Center National Taiwan University of Science and Technology Taipei 10607 Taiwan Department of Chemical Engineering Feng Chia University 100 Wenhwa Road Seatwen Taichung 40724 Taiwan

The concentration gradient between solution to absorbent predominately determines the absorption and desorption rates, limited the efficiency of wastewater treatment at low pollutant concentration. Dielectrophoresis force (F_DEP) is generated with polarization to assemble the absorbents and oil-in-water micelles (OWM) in a home-made parallel plate capacitor (PPC) full of adsorbent solution and enhance the efficiency of pollutant removal. Graphene oxide (GO) and Fe₃O₄ nanoparticles (FN) are coated on polystyrene microspheres (PSs) as the core/shell PS/GO/FN absorbents that were encapsulated within the PPC to treat the solution of OWM. The F_DEP enhances the adsorption rate ca. 2–4 times with polarization at 14 V and 100 kHz. 50 % volume reducing of pure water through the PPC for the recycling of the absorbents could achieve at 1200 kHz. The high complex permittivity of the GO/FN coating facilitates the response to the alternative electric field to induce the dipoles in the object without significant damage. The PS/GO/FNs was reused ca. 10 times at 25 mL min⁻¹ of flow rate through the PPC between 100 and 1200 kHz. The continuous dielectric polarization system improves the absorption rates and efficiency of absorbent recycling with low secondary pollution. © 2023

关键词： Capacitor Graphene oxide Magnetic bead Oil absorbent Sandwich-structured

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Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system

arXiv

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arXiv 2022年

作者： Ko, Eun Kyo Hahn, Sungsoo Sohn, Changhee Lee, Sangmin Lee, Seung-Sup B. Sohn, Byungmin Kim, Jeong Rae Son, Jaeseok Song, Jeongkeun Kim, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong H. Kim, Changyoung Noh, Tae Won Seoul08826 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Department of Physics Ulsan National Institute of Science and Technology Ulsan Korea Republic of Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul08826 Korea Republic of

Hund’s rule coupling (J) has attracted much attention recently for its role in the description of the novel quantum phases of multi-orbital materials. Depending on the orbital occupancy, J can lead to various intriguing phases. However, experimental confirmation of the orbital occupancy dependency has been difficult as controlling the orbital degrees of freedom normally accompanies chemical inhomogeneities. Here, we demonstrate a method to investigate the role of orbital occupancy in J related phenomena without inducing inhomogeneities. By growing SrRuO3 monolayers on various substrates with symmetry-preserving interlayers, we gradually tune the crystal field splitting and thus the orbital degeneracy of the Ru t2g orbitals. It effectively varies the orbital occupancies of two-dimensional (2D) ruthenates. Via in-situ angle-resolved photoemission spectroscopy, we observe a progressive metal-insulator transition (MIT). It is found that the MIT occurs with orbital differentiation: concurrent opening of a band insulating gap in the dxy band and a Mott gap in the dxz/yz bands. Our study provides an effective experimental method for investigation of orbital-selective phenomena in multi-orbital materials. Copyright © 2022, The Authors. All rights reserved.

关键词： Metal insulator transition

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Facile integration of giant exchange bias in Fe5GeTe2/oxide heterostructures by atomic layer deposition

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Physical Review materials 2023年第1期7卷 014008-014008页

作者： Jierui Liang Shanchuan Liang Ti Xie Andrew F. May Thomas Ersevim Qinqin Wang Hyobin Ahn Changgu Lee Xixiang Zhang Jian-Ping Wang Michael A. McGuire Min Ouyang Cheng Gong Department of Electrical and Computer Engineering and Quantum Technology Center University of Maryland College Park Maryland 20742 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Physics University of Maryland College Park Maryland 20742 USA SKKU Advanced Institute of Nanotechnology Sungkyunkwan University Suwon Gyeonggido 16419 Republic of Korea Department of Mechanical Engineering Sungkyunkwan University Suwon Gyeonggido 16419 Republic of Korea King Abdullah University of Science and Technology (KAUST) Physical Sciences and Engineering Division (PSE) Thuwal Saudi Arabia Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA

Exchange bias arises from the interfacial exchange coupling in ferromagnet-antiferromagnet bilayers and manifests as a horizontal shift of the magnetic hysteresis loop, constituting a critical component underpinning a broad range of magnetoresistive logic and memory devices. The facile implementation of exchange bias in van der Waals (vdW) magnets would be a key step towards practical devices for emerging vdW spintronics. Here, we report an easy approach to establishing strong exchange bias in the vdW magnet Fe5GeTe2 by a single-step process—atomic layer deposition (ALD) of oxides on Fe5GeTe2. We successfully created exchange bias of 300–1500 Oe in Fe5GeTe2/Al2O3, Fe5GeTe2/ZnO, and Fe5GeTe2/V2O5 heterostructures, at 130 K. Control experiments showed that increasing the oxidant pulse duration in each ALD cycle or utilizing the stronger oxidant O3 can enhance the exchange bias strength, revealing the key role of the ALD oxidants. Our systematic work elucidates the essential role of ALD-enabled oxidization of Fe5GeTe2 in the formation of exchange bias, and establishes ALD of oxides as a facile, controllable, and generally effective approach to creating giant exchange bias in vdW magnets, representing an integral advance towards practical vdW spintronic devices.

关键词： Exchange bias Magnetism Ferromagnets Van der Waals systems

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Beating stripe solitons arising from helicoidal spin-orbit coupling in Bose-Einstein condensates

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Physical Review E 2025年第4期111卷 044203-044203页

作者： Cui-Cui Ding Qin Zhou B. A. Malomed Research Group of Nonlinear Optical Science and Technology Research Center of Nonlinear Science School of Mathematical and Physical Sciences Wuhan Textile University Wuhan 430200 China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan 430200 China Department of Physical Electronics School of Electrical Engineering Faculty of Engineering and the Center for Light-Matter University Tel Aviv University Tel Aviv Israel Instituto de Alta Investigación Universidad de Tarapacá Casilla 7D Arica Chile

We demonstrate that the model of a spatially nonuniform two-component Bose-Einstein condensates (BEC) featuring the helicoidal spin-orbit coupling (SOC), gives rise to dark-bright soliton complexes characterized by spatiotemporal periodic oscillations in each component. These solitons are formed by the superposition of dark and bright ones, and exhibit a beating state over time and a striped state across space, earning them the designation of beating stripe solitons. Our analysis demonstrates that helicoidal SOC significantly affects the formation and dynamical properties of these solitons, also serving as the primary driver for spin oscillations. Through the nonlinear superposition of the beating stripe solitons, a range of intricate scenarios of the interaction between multiple solitons emerges, including head-on collisions, bound states, and parallel states.

关键词： Solitons

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