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Two Repeated Quasi-periodic Oscillations in the FSRQ S5 1044+71 Observed by TESS

Research in Astronomy and Astrophysics 2025年第2期25.0卷 30-37页

作者： Jun-Jie Wang Ting-Feng Yi Yangwei Zhang He Lu Yuncai Shen Lisheng Mao Liang Dong Key laboratory of Colleges and Universities in Yunnan Province for High-energy Astrophysics Department of PhysicsYunnan Normal University Guangxi Key laboratory for the Relativistic Astrophysics School of Physical Science and TechnologyGuangxi University Yunnan Province China-Malaysia HF-vHF Advanced Radio Astronomy Technology international Joint laboratory Yunnan ObservatoriesChinese Academy of Sciences South-Western Institute for Astronomy Research Yunnan University

In this work, we report for the first time two repeated quasi-periodic oscillations（QPOs） in the light curve of the Flat Spectrum Radio Quasar S5 1044+71. This source was observed by the Transiting Exoplanet Survey Satellite in multiple sectors. We used the generalized Lomb-Scargle periodogram method and weighted wavelet Z-transform method to search for significant periodic signals. The main results are as follows: We found QPOs of ～7.0 days（persisted for 4 cycles,with a significance of ～3.5σ） and ～7.3 days（persisted for 5 cycles, with a significance of ～3.8σ） in the light curves of Sector 47 and EP1, respectively. Considering range of error, we regard them to be the same. We discussed two likely models of these rapid quasi-periodic variations: One comes from the jet and the other from the accretion disk. For the first one, we consider kink instability of the jet as a plausible explanation. Second, the QPO probably comes from the main hot spots in the accretion disk, which are located approximately within the innermost stable circular orbit allowed by general relativity. Based on this model, we estimate the mass of the black hole in S5 1044+71 to be 3.49 × 10～9M☉.

关键词： (galaxies:) quasars: individual (FSRQ S5 1044+71) (galaxies:) quasars: supermassive black holes galaxies: jets

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Dietary Zn proteinate with moderate chelation strength alleviates heat stress‑induced intestinal barrier function damage by promoting expression of tight junction proteins via the A20/NF‑κB p65/MMP‑2 pathway in the jejunum of broilers

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Journal of Animal Science and Biotechnology 2025年第1期16卷 316-330页

作者： Yangyang Hu Weiyun Zhang Ke Yang Xi Lin Hsiao‑Ching Liu Jack Odle Miles Todd See Xiaoyan Cui Tingting Li Shengchen Wang Xiudong Liao Liyang Zhang Sufen Li Yun Hu Xugang Luo Poultry Mineral Nutrition laboratory College of Animal Science and TechnologyYangzhou UniversityYangzhou 225000China Hebei Normal University of Science and Technology Qinhuangdao 066004China Department of Animal Science North Carolina State UniversityRaleighNC 27695USA Mineral Nutrition Research Division State Key Laboratory of Animal NutritionInstitute of Animal ScienceChinese Academy of Agricultural SciencesBeijing 100193China

Background The aim of this study was to determine whether and how Zn proteinate with moderate chelation strength(Zn-Prot M)can alleviate heat stress(HS)-induced intestinal barrier function damage of broilers.A completely randomized design was used for comparatively testing the effects of Zn proteinate on HS and non-HS *** high temperature(HT),a 1(Control,HT-CON)+2(Zn source)×2(added Zn level)factorial arrangement of treatments was *** 2 added Zn sources were Zn-Prot M and Zn sulfate(ZnS),and the 2 added Zn levels were 30 and 60 mg/*** normal temperature(NT),a CON group(NT-CON)and pair-fed group(NT-PF)were *** The results showed that HS significantly reduced mRNA and protein expression levels of claudin-1,occludin,junctional adhesion molecule-A(JAMA),zonula occludens-1(ZO-1)and zinc finger protein A20(A20)in the jejunum,and HS also remarkably increased serum fluorescein isothiocyanate dextran(FITC-D),endotoxin and interleukin(IL)-1βcontents,serum diamine oxidase(DAO)and matrix metalloproteinase(MMP)-2 activities,nuclear factor kappa-B(NF-κB)p65 mRNA expression level,and protein expression levels of NF-κB p65 and MMP-2 in the ***,dietary supplementation with Zn,especially organic Zn as Zn-Prot M at 60 mg/kg,significantly decreased serum FITC-D,endotoxin and IL-1βcontents,serum DAO and MMP-2 activities,NF-κB p65 mRNA expression level,and protein expression levels of NF-κB p65 and MMP-2 in the jejunum of HS broilers,and notably promoted mRNA and protein expression levels of claudin-1,ZO-1 and *** Our results suggest that dietary Zn,especially 60 mg Zn/kg as Zn-Prot M,can alleviate HS-induced intestinal barrier function damage by promoting the expression of TJ proteins possibly via induction of A20-mediated suppression of the NF-κB p65/MMP-2 pathway in the jejunum of HS broilers.

关键词： A20/NF-κB p65/MMP-2 pathway Broiler Heat stress Intestinal barrier function Tight junction proteins Zn

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Recent progress and perspectives on highly-safe and energy-dense solid-state Li-CO_(2) batteries

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Science Bulletin 2025年第2期70卷 135-139页

作者： Yunyun Xu Zichen Xu Sang-Young Lee Zhong-Shuai Wu State Key laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Dalian National laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Li-CO_(2)batteries are highly anticipated as promising candidates for advanced electrochemical energy storage systems owing to their high theoretical specific energy of 1876 Wh kg^(-1),based on the discharge products of Li_(2)CO_(3)and C,their environmentally benign CO_(2)utilization [1].Since CO_(2)is the main component of the atmosphere on Mars,Li-CO_(2)batteries can serve as an excellent power source for Mars exploration ***,several key issues remain unresolved,such as the slow kinetics of CO_(2)reduction reaction(CRR) and CO_(2)evolution reaction(CER),the severe side reaction between Li with CO_(2),and the risk of the electrolyte combustion due to thermal runaway,all of which hinder the practical application of Li-CO_(2)batteries.

关键词： energy hinder electrolyte

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Phase transition thermosensitive photocatalytic hydrogel for enhanced uranium extraction

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Science Bulletin 2025年第1期70卷 4-6页

作者： Jiacheng Zhang Yihui Yuan Ning Wang State Key laboratory of Marine Resource Utilization in South China Sea Collaborative Innovation Center of Marine Science and TechnologyHainan UniversityHaikou 570228China

As a clean energy source,nuclear energy is crucial for realizing carbon neutralization and the construction of many nuclear plants is underway[1].According to an estimate by the international Atomic Energy Agency,the global nuclear energy production is expected to increase by 56%between 2015 and 2030[2].However,with current consumption rate of uranium resources,terrestrial uranium reserves will be depleted within approximately 80 years[3,4].

关键词： approximate transition hydrogel

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A Broad Range Triboelectric Stiffness Sensor for variable Inclusions Recognition

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Nano-Micro Letters 2023年第12期15卷 298-309页

作者： Ziyi Zhao Zhentan Quan Huaze Tang Qinghao Xu Hongfa Zhao Zihan Wang Ziwu Song Shoujie Li Ishara Dharmasena Changsheng Wu Wenbo Ding Tsinghua‑Berkeley Shenzhen Institute Institute of Data and InformationShenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China Institute of Ocean Engineering Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough UniversityLoughborough LE113TUUK Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore risc-v international open source laboratory 518055 ShenzhenPeople’s Republic of China

With the development of artificial intelligence,stiffness sensors are extensively utilized in various fields,and their integration with robots for automated palpation has gained significant *** study presents a broad range self-powered stiffness sensor based on the triboelectric nanogenerator(Stiff-TENG)for variable inclusions in soft objects *** Stiff-TENG employs a stacked structure comprising an indium tin oxide film,an elastic sponge,a fluorinated ethylene propylene film with a conductive ink electrode,and two acrylic pieces with a shielding *** the decoupling method,the Stiff-TENG achieves stiffness detection of objects within 1.0 *** output performance and characteristics of the TENG for different stiffness objects under 4 mm displacement are *** Stiff-TENG is successfully used to detect the heterogeneous stiffness structures,enabling effective recognition of variable inclusions in soft object,reaching a recognition accuracy of 99.7%.Furthermore,its adaptability makes it well-suited for the detection of pathological conditions within the human body,as pathological tissues often exhibit changes in the stiffness of internal *** research highlights the innovative applications of TENG and thereby showcases its immense potential in healthcare applications such as palpation which assesses pathological conditions based on organ stiffness.

关键词： Stiffness sensor Decoupling method Heterogeneous stiffness variable inclusions Healthcare applications

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Two-step growth of vSe_2 films and their photoelectric properties

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Chinese Physics B 2019年第5期28卷 343-349页

作者： Yu Zeng Shengli Zhang Xiuling Li Jianping Ao Yun Sun Wei Liu Fangfang Liu Peng Gao Yi Zhang Institute of Photoelectronic Thin Film Devices and Technology Tianjin Key Laboratory of Photoelectronic Thin Film Devices and Technology Tianjin Institute of Power source

We put forward a two-step route to synthesize vanadium diselenide(vSe_2), a typical transition metal dichalcogenide(TMD). To obtain the vSe_2 film, we first prepare a vanadium film by electron beam evaporation and we then perform selenization in a vacuum chamber. This method has the advantages of low temperature, is less time-consuming, has a large area, and has a stable performance. At 400?C selenization temperature, we successfully prepare vSe_2 films on both glass and Mo substrates. The prepared vSe_2 has the characteristic of preferential growth along the c-axis, with low *** is found that the contact between Al and vSe_2/Mo is ohmic contact. Compared to Mo substrate, lower square resistance and higher carrier concentration of the vSe_2/Mo sample reveal that the vSe_2 film may be a potential material for thin film solar cells or other semiconductor devices. The new synthetic strategy that is developed here paves a sustainable way to the application of vSe_2 in photovoltaic devices.

关键词： two-step route vSe2 selenization thin film

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Sky location of massive black hole binaries in the foreground of Galactic white dwarf binaries

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 93-104页

作者： Pan Guo Hong-Bo Jin Cong-Feng Qiao Yue-Liang Wu The international Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of SciencesBeijing 100190China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China The School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China

For space-based gravitational wave(GW)detection,the main noise source for massive black hole binaries(MBHBs)is attributed to approximately 107 double white dwarf binaries in the *** a GW source,the amplitude of the detector response,recorded by a space-based gravitational wave detector,exhibits a modulation effect with a year period when observing the source from various orbital *** the adverse conditions mentioned above,where there is a strong foreground noise and annual modulation in the signals,we employed the wavelet transform and the strong-amplitude relevant orbital position search methods,which allows the weak MBHB sources to achieve higher locating *** detail,for two MBHB sources of lower intensity,the precision of luminosity distance,represented by the ratioΔD_(L)/D_(L) at the 95%confidence level,is enhanced by factors of∼*** angular resolutions,denoted byΔΩs,are enhanced by a factor of∼*** improvements increase the number of detectable GW sources,facilitate multi-messenger follow-up observations and provide constraints on the cosmological constant.

关键词： space-based gravitational wave detection gravitational waves massive black hole binaries

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Conducting polymer-functionalized mesoporous metal-organic frameworks for high-performance Li-S battery

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Nano Research 2023年第4期16卷 4867-4873页

作者： Xiao-Fei Liu Ya-Rui Wang Hong Chen Bo Li Shuang-Quan Zang Henan Key laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China Collaborative Innovation Center of Water Security for Water source Region of Mid-line of South-to-North Diversion Project of Henan Province College of Chemistry and Pharmacy EngineeringNanyang Normal UniversityNanyang 473061China

It was known that mesoporous metal-organic frameworks(MOFs)with hierarchical pores and unsaturated metal sites can effectively inhibit the shuttle effect of lithium polysulfides in lithium-sulfur battery,however,the unsatisfactory structural stability and electrical conductivity limit the application of mesoporous MOFs(MMOFs)in Li-S *** at sensible solutions,the conductive polyaniline(PANI)was incorporated into the MMOF to enhance the discharge capacity and the cycling stability of proposed Li-S batteries,as the stability and the conductivity of the MMOF cathode was improved *** activated MMOF-PANI provides physical and chemical adsorption of polysulfides against their shuttle ***,the introduction of PANI into the channels of MMOF effectively improves the conductivity of MMOF,thus improving the electrochemical performance of the MMOF-PANI-based *** from these synergetic effects,the S@MMOF-PANI cathode delivers improved electrochemical performance including excellent rate performance and cycling *** battery shows an initial capacity of 777.7 mAh·g^(−1)at 2.0 C and a low decay rate of 0.06%per cycle in 1,000 cycles and approximately a repeatable rate performance.

关键词： metal-organic framework conductivity mesoporous shuttle effect Li-S battery

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Oxygen-coordinated low-nucleus cluster catalysts for enhanced electrocatalytic water oxidation

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Carbon Energy 2023年第2期5卷 137-147页

作者： Jiapeng Ji Yunpeng Hou Shiyu Zhou Tong Qiu Liang Zhang Lu Ma Chao Qian Shaodong Zhou Chengdu Liang Min Ling Zhejiang Provincial Key laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhouChina Jiangsu Key laboratory for Carbon-Based Functional Materials&Devices Joint International Research Laboratory of Carbon-Based Functional Materials and DevicesInstitute of Functional Nano&Soft Materials(FUNSOM)Soochow UniversitySuzhouJiangsuChina National Synchrotron Light source II Brookhaven National LaboratoryUptonNew YorkUSA Institute of Zhejiang University-Quzhou QuzhouChina

The oxygen evolution reaction(OER)activity of single-atom catalysts(SACs)is closely related to the coordination environment of the active *** atomic metal species bring about unique features beyond nitrogen-coordinated atomic metal species due to the fact that the M-O bond is weaker than the M-N ***,a series of metal-oxygen-carbon structured low-nucleus clusters(LNCs)are successfully anchored on the surface of multiwalled carbon nanotubes(M-MWCNTs,M=Ni,Co,or Fe)through a foolproof low-temperature gas transfer(300℃)method without any further *** morphology and coordination configuration of the LNCs at the atomic level were confirmed by comprehensive *** synthetic Ni-MWCNTs electrocatalyst features excellent OER activity and stability under alkaline conditions,transcending the performances of Co-MWCNTs,Fe-MWCNTs and RuO_(2).Density functional theory calculations reveal that the moderate oxidation of low-nucleus Ni clusters changes the unoccupied orbital of Ni atoms,thereby lowering the energy barrier of the OER rate-limiting step and making the OER process more *** study demonstrates a novel versatile platform for large-scale manufacturing of oxygen-coordinated LNC catalysts.

关键词： electrocatalytic water oxidation low-nucleus cluster low-temperature gas transfer metal-oxygen-carbon structure

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In-situ loading neutron-diffraction studies of a cobalt-based superalloy

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中国有色金属学会会刊：英文版 2006年第A02期16卷 144-148页

作者： M. L. BENSON P. K LIAW H. CHOO T. A. SALEH D. W. BROWN M. R. DAYMOND X. L. WANG A. D. STOICA E. C. OLIvER D. L. KLARSTROM Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA Metals and Ceramics Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA Los Alamos Neutron Science Center Los Alamos National Laboratory Los Alamos NM 87545 USA Department of Mechanical and Materials Engineering Queen＇s University Kingston ON K7L3N6 Canada Spallation Neutron source Oak Ridge National Laboratory Oak Ridge TN 37831 USA ISIS Pulsed Neutron and Muon source Rutherford-Appleton Laboratory Chilton Didcot OX 11 0QX UK Haynes international Inc Kokomo IN 46904 USA

ULTIMET (R) alloy is a cobalt-based superalloy that undergoes a deformation-induced phase transformation from a face-centered-cubic (fcc) phase to a hexagonal-close-packed (hcp) phase. The transformation was studied during monotonic loading, stress-controlled high-cycle fatigue (HCF) and strain-controlled low-cycle fatigue (LCF). The HCF was performed at a maximum stress of sigma(max) =840 MPa and a minimum stress of sigma(min) =84 MPa, while the tensile experiment was terminated after reaching sigma(max) =890 MPa. The LCF was performed at. a maximum strain of sigma(max) =1.25% and a minimum strain Of sigma(min) =-1.25%. The monotonic-loading experiment results reveal that the hcp phase forms after reaching the yield stress. During HCF, the hexagonal phase forms immediately upon the first fatigue cycle, with no further change in structure upon subsequent deformation. In contrast to HCF, the hcp phase forms gradually during LCF. In fact, fatigue cycle 12 is reached before the hcp phase is resolved by neutron diffraction. Diffraction patterns from subsequent fatigue cycles reveal that the hcp phase continues to accumulate as LCF progresses. These observations can be related to the input of mechanical energy during different loading modes.

关键词：钴基高温合金现场加载中子衍射 fcc hcp 相变

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