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Interfacial ion regulation on 2D layered double hydroxide nanosheets for enhanced thermal insulation

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Science China Chemistry 2022年第5期65卷 898-904页

作者： Chun Wang Hengyu Xu Han Cheng Hao Yu Si liu Wenjie Wang Ruilin Yuan hongfei liu Tianpei Zhou Wangsheng Chu HengAn Wu Yi Xie Changzheng Wu Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaCAS Center for Excellence in Nanoscienceand CAS Key Laboratory of Mechanical Behavior and Design of MaterialsHefei 230026China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System Mechanics University of Science and Technology of ChinaHefei 230027China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

Exploring new strategies to broaden the upper/lower limit of thermal conductivity is of great interest to develop thermal management materials that can adapt to extreme *** this work,we employ an interfacial ion regulation to enhance the thermal insulation performance of 2D layered double hydroxide *** introduction of interfacial ion enlarges the interplanar spacing of Co(OH)_(2) nanosheets from 4.64 to 8.05 ?,which reduces phonon scattering length perpendicular to the two-dimensional plane and leads to enhanced interlayer thermal *** interfacial ion-regulated Co(OH)_(2)(named as Co(OH)_(2)-M^(x-)) exhibits 3-fold enhancement of thermal insulation through decreasing the thermal conductivity to as low as 0.15 W m^(-1) K^(-1),which is among the top values in 2D solid *** anticipate that interfacial ion regulation for 2D nanosheets paves a new avenue to break through the thermal insulation limit.

关键词： two dimensional materials interfacial ion regulation thermal conductivity phonon scattering

Polyaniline-modified cetyltrimethylammonium bromide- graphene oxide-sulfur nanocomposites with enhanced performance for lithium-sulfur batteries

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Nano Research 2014年第9期7卷 1355-1363页

作者： Yongcai Qiu Wanfei Li Guizhu Li Yuan Hou Lisha Zhou hongfei Li Meinan liu Fangmin Ye Xiaowei Yang Yuegang Zhang i-LAB Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China

Conductive polymer coatings can boost the power storage capacity of lithiumsulfur batteries. We report here on the design and preparation--by combining a facile and green chemical deposition method with an oxidative polymerization approach--of polyaniline （PANI）-modified cetyltrimethylammonium bromide （CTAB）-graphene oxide （GO）-sulfur （S） nanocomposites with significantly enhanced performance in lithium-sulfur batteries. Such conductive polymer modified CTAB-GO-S nanocomposites as sulfur cathode materials can deliver high specific discharge capacities and long-term cycling performance, i.e., -970 mAh-g-1 at 0.2 C and -715 mAh-g-1 after 300 cycles, -820 mAh.g-1 at 0.5 C and -670 mAh.g-1 after 500 cycles, -770 mAh.K at 1 C and -570 mAh.g-~ after 500 cycles. The capacity decay was as low as 0.036% per cycle at 0.5 C, and 0.051% per cycle at 1 C. Under the same condition, batteries using PANI-modified CTAB-GO-S as cathodes exhibited higher specific capacity and higher average coulombic efficiency compared with CTAB-decorated GO-S and GO--S nano- composites. The improved performance can be attributed to the lower charge transfer resistance and the alleviated dissolution of polysulfides in the PANI- modified CTAB-GO-S cathodes.

关键词： polyaniline graphene oxide-sulfur lithium-sulfur batteries long-term cycling

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不同地震仪器联合采集技术探讨

物探装备 2025年第1期35卷 1-4,12页

作者：朴金山朱汝明王亮刘鸿飞孟凡平中国石油集团东方地球物理勘探有限责任公司装备服务中心河北涿州072750

随着大道数高效采集技术的广泛应用,有线仪器和节点仪器、不同节点仪器之间混合采集越来越普遍。由于不同地震仪器生产厂家的设计理念、整体架构设计和数字滤波芯片选型的不同导致其滤波特性等关键技术性能存在很大的差异。为了保证联... 详细信息

随着大道数高效采集技术的广泛应用,有线仪器和节点仪器、不同节点仪器之间混合采集越来越普遍。由于不同地震仪器生产厂家的设计理念、整体架构设计和数字滤波芯片选型的不同导致其滤波特性等关键技术性能存在很大的差异。为了保证联合采集数据的一致性,需要在施工生产前充分考虑滤波方式和低切频率的选择、前放增益的匹配和直流漂移的移除等,选取合适的参数设置消除影响;同时,也要通过优化激发控制系统的启动控制方式实现激发GPS时间为整秒(或4 ms、8 ms),保证混用的地震仪器原始数据中始终存在某一样点对应时间与激发GPS时间完全吻合,消除不同地震仪器对数据文件首个样点的处理方式不同带来的影响。鉴于不同地震仪器数据文件的切分和合成方法不同,在混合采集时要根据工作原理提前规划好工作流程,提高工作效率。

关键词：联合采集激发控制数据一致性数据切分

Estimation of Solar Observations with the Five-hundred-meter Aperture Spherical Radio Telescope(FAST)

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Research in Astronomy and Astrophysics 2023年第1期23卷 1-3页

作者： Lei Qian Zhichen Pan hongfei liu Hengqian Gan Jinglong Yu Lei Zhao Jiguang Lu Cun Sun Jingye Yan Peng Jiang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China Guizhou Radio Astronomical Observatory Guizhou UniversityGuiyang 550025China College of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100101China Key Laboratory of Radio Astronomy Chinese Academy of SciencesBeijing 100101China National Space Science Center Chinese Academy of SciencesBeijing 100190China

We present the estimation of solar observation with the Five-hundred-meter Aperture Spherical radio Telescope(FAST).For both the quiet Sun and the Sun with radio bursts,when pointing directly to the Sun,the total power received by FAST would be out of the safe operational range of the signal chain,even resulting in damage to the *** a conclusion,the Sun should be kept at least~2°away from the main beam during observations at~1.25 *** separation for lower frequency should be *** simplicity,the angular separation between the FAST beam and the Sun is suggested to be~5°for observations at 200 MHz or higher bands.

关键词： Sun radio radiation-telescopes-techniques miscellaneous

Fine-mapping of a candidate gene for web blotch resistance in Arachis hypogaea L.

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Journal of Integrative Agriculture 2024年第5期23卷 1494-1506页

作者： Xiaohui Wu Mengyuan Zhang Zheng Zheng Ziqi Sun Feiyan Qi Hua liu Juan Wang Mengmeng Wang Ruifang Zhao Yue Wu Xiao Wang hongfei liu Wenzhao Dong Xinyou Zhang College of Agronomy Henan Agricultural UniversityZhengzhou 450046China Henan Academy of Agricultural Sciences/Henan Academy of Crop Molecular Breeding/Key Laboratory of Oil Crops in Huang-Huai-Hai Plain Ministry of Agriculture and Rural Affairs/Henan Provincial Key Laboratory for Oil Crop ImprovementZhengzhou 450002China The Shennong Laboratory Zhengzhou 450002China Shangqiu Academy of Agricultural and Forestry Sciences Shangqiu 476000China

Peanut(Arachis hypogaea L.)is a globally important oil *** blotch is one of the most important foliar diseases affecting peanut,which results in serious yield losses *** web blotch-resistant peanut varieties is the most effective and economically viable method for minimizing yield losses due to web *** the current study,a bulked segregant analysis with next-generation sequencing was used to analyze an F2:3 segregating population and identify candidate loci related to web blotch *** on the fine-mapping of the candidate genomic interval using kompetitive allele-specific PCR(KASP)markers,we identified a novel web blotch resistance-related locus spanning approximately 169 kb on chromosome *** region included four annotated genes,of which only Arahy.35VVQ3 had a non-synonymous single nucleotide polymorphism in the coding region between the two *** markers(Chr.16.12872635 and Chr.16.12966357)linked to this gene were shown to be co-segregated with the resistance of peanut web blotch by 72 randomly selected recombinant inbred lines(RIL),which could be used in marker-assisted breeding of resistant peanut varieties.

关键词： peanut web blotch bulked segregant analysis KAsP markers resistant gene

Preparation, Characterization and Dielectric Properties of Ba_6Mg_(0.67)Nb_(9.33)O_(30) Ceramic

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Journal of Wuhan University of Technology(Materials Science) 2005年第3期20卷 14-16页

作者：张辉 State Key Lab of Advanced Tech. for Mater. Synthesis and Processing Wuhan University of Technology

A new niobate Ba6Mg0.67Nb9.33O30 was ssnthesized in the BaO-MgO-Nb2O5 system by solid state reaction at 1350 ℃ for 48 b. The strncture and dielectric properties of Ba6Mg0.67Nb9.33O30 were determined by X-ray pouder diffraction, straining electron microscopy and dielectric measurements. The results show that Ba6Mg0.67Nb9.33O30 belongs to ferroelectric phase of filled tetragonal tungsten bronze structure at room temperature with unit cell parameters ： a = 1. 26052（4） nm , c = 0.40045（2） nm, space group P4bm , calculated density 5 . 707g. cm ^-3 . Ba6Mg0.67Nb9.33O30 belongs to relaxor ,ferroetectrics undergoing diffusive phase transition, and the transition temperature （ Tc ） is 30 ℃ observed at 10 kHz. At room temperature, Ba6Mg0.67Nb9.33O30 eeramic has a high dielectric constant 850 at 1 MHz and a low dielectric loss of 0. 0052.

关键词： Niobate tungsten bronze structure dielectric properties XRD retaxor ferroelectrics

Downregulation of HNRNPK in human cancer cells inhibits lung metastasis

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Animal Models and Experimental Medicine 2019年第4期2卷 291-296页

作者： Mengyuan Li Wenlong Zhang Xingjiu Yang hongfei liu Lin Cao Weisha Li Le Wang Guoxin Zhang Ran Gao Key Laboratory of Human Disease Comparative Medicine(National Health and Family Planning Commission) The Institute of Laboratory Animal ScienceChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijingP.R.China Beijing Engineering Research Center for Experimental Animal Models of Human Critical Diseases BeijingP.R.China

Background: Lung cancer frequently occurs in the clinic, leading to poor prognosis and high mortality. Markers for early diagnosis of lung cancer are scarce, and further potential therapeutic targets are also urgently ***: We established a new mouse model in which the specific gene HNRNPK(heterogeneous nuclear ribonucleoprotein K) was downregulated after administration of doxycycline. The lung metastatic nodules were investigated using bioluminescence imaging, micro-CT, and autopsy ***: Compared with the short hairpin negative control group, less lung metastatic nodules were formed in the short hairpin RNA ***: Downregulation of HNRNPK in cancer cells can inhibit lung metastasis.

关键词： HNRNPK lung metastasis mouse model

HPLC法分析不同提取方法对桦褐孔菌中3种成分含量的影响

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食品研究与开发 2025年第2期46卷 178-182页

作者：陈佳慧张勇王战伟庞舒月刘虹妃吴志兰王晶长春师范大学化学学院吉林长春130032 长春师范大学科技创新研究院吉林长春130032 铜仁市疾病预防控制中心贵州铜仁554300 长春师范大学生命科学学院吉林长春130032

建立高效液相色谱检测桦褐孔菌粗提物中原儿茶酸、原儿茶醛和紫萁酮3种化合物含量的方法,对比评价超声辅助提取法、回流提取法、微波辅助提取法、酶解提取法4种不同提取方法对桦褐孔菌粗提物中活性成分含量的影响。结果表明,该检测方法... 详细信息

建立高效液相色谱检测桦褐孔菌粗提物中原儿茶酸、原儿茶醛和紫萁酮3种化合物含量的方法,对比评价超声辅助提取法、回流提取法、微波辅助提取法、酶解提取法4种不同提取方法对桦褐孔菌粗提物中活性成分含量的影响。结果表明,该检测方法精密度较高,3种化合物的精密度的相对标准偏差(relative standard deviation,RSD)分别为0.14%、0.06%、0.20%;重复性RSD分别为1.67%、1.98%、2.22%;在24 h内稳定性较好,其RSD分别为0.20%、0.61%、0.25%。对比不同提取方法对3种化合物的影响,发现采用超声辅助提取法得到的目标化合物产量较高,适用于桦褐孔菌中主要活性成分的提取。该研究建立的HPLC法检测桦褐孔菌粗提物中原儿茶酸、原儿茶醛和紫萁酮含量的结果准确。

关键词：桦褐孔菌高效液相色谱提取方法原儿茶酸原儿茶醛紫萁酮

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Status and perspectives of the CRAFTS extra-galactic HI survey

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Science China(Physics,Mechanics & Astronomy) 2019年第5期62卷 52-60页

作者： Kai Zhang JingWen Wu Di Li Marko Krco Lister Staveley-Smith NingYu Tang Lei Qian MengTing liu ChengJin Jin YouLing Yue Yan Zhu hongfei liu DongJun Yu JingHai Sun GaoFeng Pan Hui Li HengQian Gan Rui Yao FAST Collaboration National Astronomical Observatories Chinese Academy of SicencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of FAST National Astronomical Obserx'atoriesChinese Academy of SciencesBeijing 100101China International Centre for Radio Astronomy Research (ICRAR) The University1 of Western AustraliaPerth 6907Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) The University of Western AustraliaPerth 6907Australia 不详

The Five-hundred-meter Aperture Spherical radio Telescope(FAST) is expected to complete its commissioning in 2019. FAST will soon begin the Commensal Radio Astronomy FasT Survey(CRAFTS), a novel and unprecedented commensal drift scan survey of the entire sky visible from FAST. The goal of CRAFTS is to cover more than 20000 deg2 and reach redshift up to about 0.35. We provide empirical measurements of the beam size and sensitivity of FAST across the 1.05 to 1.45 GHz frequency range of the FAST L-band array of 19-beams(FLAN). Using a simulated HI-galaxy catalogue based on the HI Mass Function(HIMF), we estimate the number of galaxies that CRAFTS may detect. At redshifts below 0.35, over 6 × 105 HI galaxies may be detected. Below the redshift of 0.07, the CRAFTS HIMF will be complete above a mass threshold of 109.5 M⊙. FAST will be able to investigate the environmental and redshift dependence of the HIMF to an unprecedented depth, shedding light onto the missing baryon and missing satellite problems.

关键词： HI regions and 21-cm lines radio telescopes and instrumentation statistical and correlative studies of properties