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All-optical signal processing for linearity enhancement of Mach–Zehnder modulators

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Chinese Science Bulletin 2014年第22期59卷 2655-2660页

作者： Xiao-Ping Zheng Guo-Qiang zhang Shangyuan Li han-yi zhang Bing-Kun Zhou Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University

This paper presents the fundamental principles and recent advances in the field of linearity enhancement of Mach–Zehnder modulators in microwave photonic systems using all-optical signal processing.A review of the fu... 详细信息

关键词：光信号处理线性度调制器马赫子系统原理微波

In situ characterization of vacancy ordering in Ge-Sb-Te phase-change memory alloys

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Fundamental Research 2024年第5期4卷 1235-1242页

作者： Ting-Ting Jiang Xu-Dong Wang Jiang-Jing Wang han-yi zhang Lu Lu Chunlin Jia Matthias Wuttig Riccardo Mazzarello Wei zhang En Ma Center for Alloy Innovation and Design(CAID) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China Institute of Physics IA RWTH Aachen UniversityAachen 52074Germany The School of Microelectronics State Key Laboratory for Mechanical Behavior of MaterialsXi'an JiaotongUniversityXi'an 710049China JARA-FIT and JARA-HPC RWTH Aachen UniversityAachen 52056Germany Peter Grünberg Institute(PGI 10) Forschungszentrum Jülich GmbHJülich 52425Germany Department of Physics Sapienza University of RomeRome 00185Italy

Tailoring the degree of structural disorder in Ge-Sb-Te alloys is important for the development of non-volatile phase-change memory and neuro-inspired *** crystallization from the amorphous phase,these alloys form a cubic rocksalt-like structure with a high content of intrinsic *** thermal annealing results in a gradual structural transition towards a layered structure and an insulator-to-metal *** this work,we elucidate the atomic-level details of the structural transition in crystalline GeSb_(2)Te_(4) by in situ high-resolution transmission electron microscopy experiments and ab initio density functional theory calculations,providing a comprehensive real-time and real-space view of the vacancy ordering *** also discuss the impact of vacancy ordering on altering the electronic and optical properties of GeSb_(2)Te_(4),which is relevant to multilevel storage *** phase evolution paths in Ge-Sb-Te alloys and Sb_(2)Te_(3)are illustrated using a summary diagram,which serves as a guide for designing phase-change memory devices.

关键词： Phase-change materials Vacancy ordering Structural transition Metavalent bondingin situ TEM

An all-round Al-Chemist with a scientific mind

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National Science Review 2022年第10期9卷 158-168页

作者： Qing Zhu Fei zhang Yan Huang Hengyu Xiao Lu Yuan Zhao Xu Chun zhang Tao Song Xin Sheng Tang Xiang Li Guo He Bao Chen Chong Jun yi Zhou yi han zhang Baicheng zhang Jia Qi Cao Man Luo Song Wang Gui Lin Ye Wan Jun zhang Xin Chen Shuang Cong Donglai Zhou Huirong Li Jialei Li Gang Zou Wei Wei Shang Jun Jiang yi Luo Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China School of Information Science and Technology University of Science and Technology of China Hefei Ji Shu Quantum Technology Co.Ltd Hefei National Laboratory University of Science and Technology of China

The realization of automated chemical experiments by robots unveiled the prelude to an artificial intelligence(AI) *** AI-based systems or robots with specific chemical skills have been demonstrated,but conducting all-round scientific research remains ***,we present an all-round AI-Chemist e quipped with scientific data intelligence that is capable of performing basic tasks generally re quired in chemical *** on a service platform,the AI-Chemist is able to automatically read the literatures from a cloud database and propose experimental plans *** can control a mobile robot in-house or online to automatically execute the complete experimental process on 14workstations,including synthesis,characterization and performance *** experimental data can be simultaneously analysed by the computational brain of the AI-Chemist through machine learning and Bayesian optimization,allowing a new hypothesis for the next iteration to be *** competence of the AI-Chemist has been scrutinized by three different chemical *** the future,the more advanced all-round AI-Chemists equipped with scientific data intelligence may cause changes to the landscape of the chemical laboratory.

关键词： AI-Chemist computational brain mobile robot machine reading all-round research

Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

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Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang zhang Changhua Wang Chung Hsien Wu Jiwen Jiang Fei Long Liyuan han Qifeng han yi‑Bing Cheng Yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination

Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： Mei zhang Wenhao Li Yangfei Chen Yang Jiang Xiaofei Guo han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation

Identifying the dynamic behaviors in complete reconstruction of Co-based complex precatalysts during electrocatalytic oxygen evolution

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Journal of Energy Chemistry 2025年第1期100卷 226-233页

作者： Jingfang zhang Danyang Wu Linke Cai Youluan Lu Fanpeng Cheng Lijuan Shi Qun yi Yao Liu yi Huang Key Laboratory of Green Chemical Engineering Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Hubei Key Laboratory of Novel Reactor and Green Chemical Technology School of Chemical Engineering & Pharmacy Wuhan Institute of Technology Key Laboratory of Pesticide & Chemical Biology of Ministry of Education Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of Education College of Chemistry Central China Normal University College of Materials Science and Engineering Fuzhou University

Transition metal-based nanomaterials have emerged as promising electrocatalysts for oxygen evolution reaction（OER）. Considerable research efforts have shown that self-reconstruction occurs on these nanomaterials under operating conditions of OER process. However, most of them undergo incomplete reconstruction with limited thickness of reconstruction layer, leading to low component utilization and arduous exploration of real catalytic mechanism. Herein, we identify the dynamic behaviors in complete reconstruction of Co-based complexes during OER. The hollow phytic acid（PA） cross-linked CoFe-based complex nanoboxes with porous nanowalls are designed because of their good electrolyte penetration and mass transport ability, in favor of the fast and complete reconstruction. A series of experiment characterizations demonstrate that the reconstruction process includes the fast substitution of PA by OH-to form Co（Fe）(OH)xand subsequent potential-driven oxidation to Co（Fe）OOH. The obtained CoFeOOH delivers a low overpotential of 290 mV at a current density of 10 mA cm-2and a long-term *** experiment results together with theory calculations reveal that the Fe incorporation can result in the electron rearrangement of reconstructed CoFeOOH and optimization of their electronic structure,accounting for the enhanced OER activity. The work provides new insights into complete reconstruction of metal-based complexes during OER and offers guidelines for rational design of high-performance electrocatalysts.

关键词： Complete reconstruction Co-based complex Precatalysts Oxygen evolution reaction

Effects of Bifidobacterium lactis BLa80 on fecal and mucosal flora and stem cell factor/c-kit signaling pathway in simulated microgravity rats

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World Journal of Gastroenterology 2025年第1期31卷 93-109页

作者： Ping zhang ying Zhu Pu Chen Tong Zhou Zhe-yi han Jun Xiao Jian-Feng Ma Wen Ma Peng Zang ying Chen Graduate School Hebei North UniversityZhangjiakou 075000Hebei ProvinceChina Key Laboratory of Aerospace Nutrition and Food Engineering China Astronaut Research and Training CenterBeijing 100094China Department of Gastroenterology The Air Force Medical CenterBeijing 100142China Department of Blood Transfusion Air Force Medical CenterBeijing 100142China

BACKGROUND Simulated microgravity environment can lead to gastrointestinal motility *** pathogenesis of gastrointestinal motility disorders is closely related to the stem cell factor(SCF)/c-kit signaling pathway associated with intestinal flora and Cajal stromal ***,intestinal flora can also affect the regulation of SCF/c-kit signaling pathway,thus affecting the expression of Cajal stromal *** cells are the pacemakers of gastrointestinal *** To investigate the effects of Bifidobacterium lactis(***)BLa80 on the intestinal flora of rats in simulated microgravity and on the gastrointestinal motility-related SCF/c-kit *** The internationally recognized tail suspension animal model was used to simulate the microgravity environment,and 30 rats were randomly divided into control group,tail suspension group and drug administration tail suspension group with 10 rats in each group for a total of 28 *** tail group was given *** BLa80 by intragastric administration,and the other two groups were given water intragastric administration,the concentration of intragastric administration was 0.1 g/mL,and each rat was 1 mL/***&eosin staining was used to observe the histopathological changes in each segment of the intestine of each group,and the expression levels of SCF,c-kit,extracellular signal-regulated kinase(ERK)and p-ERK in the gastric antrum of each group were detected by Western blotting and *** fecal flora and mucosal flora of rats in each group were detected by 16S *** Simulated microgravity resulted in severe exfoliation of villi of duodenum,jejunum and ileum in rats,marked damage,increased space between villi,loose arrangement,shortened columnar epithelium of colon,less folds,narrower mucosal thickness,reduced goblet cell number and crypts,and significant improvement after probiotic *** microgravity reduced the expressions of SCF and c-kit,and increased the express

关键词： Simulated microgravity Rat Intestinal flora Gastrointestinal motility Stem cell factor/c-kit signaling pathway

Viral and inflammatory factors determine the occurrence of hepatitis B virus-related hepatocellular carcinoma

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Viral and inflammatory factors determine the occurrence of h...

The detection, extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

全国肿瘤流行病学和肿瘤病因学学术会议

作者： yi-Fang han,Qi zhang,Guang-Wen Cao Department of Epidemiology,Second Military Medical University,Shanghai 200433,China

Primary liver cancer in men is the second most frequent cause of cancer death and hepatocellular carcinoma(HCC) accounts for 70%to 85%of the total liver cancer burden *** infection with hepatitis B virus(HBV) contributes to more than three quarters of all HCC cases *** serum viral load(≥10 copies/mL) is the most reliable indicator of viral replication in predicating the development of *** genotype C(C2) can predict HCC in the HBV-infected subjects,especially in the cirrhotic patients over 50 years,whereas genotype B(B2) is associated with the development of HCC in the non-cirrhotic young patients and relapse of HCC after surgical *** HBV subgenotype has distinct pattern of *** mutations including C1653T, T1753V,A1762T/G1764A,T1674C/G,C1766T,T1768A,G1899A,C2002T, A2159G,A2189C,G2203A/T,T53C,preS2 start codon mutation,preS1 deletion, C2964A,A2962G,C3116T,and C7A are clearly associated with an increased risk of *** mutations in combinations are specifically associated with *** mutations accumulate during the progression of chronic HBV infection and can predict the occurrence of *** inflammation,possibly initiated by HBV and maintained by imbalance either between Th1 and Th2 cells or between Th17 and Treg cells,may lead to an increase in the frequency of viral mutation via induction of cellular cytidine *** HBV mutations may be selected by immune reaction,whereas the escaped HBV mutants might in turn play an active role in *** inflammatory pathways including nuclear factor-κB, the signal transducer and activator of transcription 3,Wnt/β-catenin,and transforming growth factor-β1 signaling pathways contribute,at least partially,to the inflammation-necrosis- regeneration process,ultimately *** hallmark molecules including serum IL-6 can predict the occurrence of this malignancy in the hepatitis B *** factors are of importance for developing active

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 86-96页

作者： Qianyun Yun Wen-Biao han yi-Yang Guo He Wang Minghui Du hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/hangzhou) University of Chinese Academy of Sciences Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) Center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-layer convolutional neural network(CNN) approach to detect EMRI signals for space-borne detectors, achieving a true positive rate(TPR) of 96.9% at a 1% false positive rate(FPR) for signal-to-noise ratio(SNR) from 50 to 100. Especially, the key intrinsic parameters of EMRIs such as the mass, spin of the supermassive black hole(SMBH) and the initial eccentricity of the orbit can also be inferred directly by employing a neural network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform model. This study underscores the potential of deep learning methods in EMRI data analysis, enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词： gravitational wave EMRIs deep-learing