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Less than 6 GHz resolution THz spectroscopy of water vapor

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Science China(Technological Sciences) 2015年第12期58卷 2104-2109页

作者： ZHAN HongLei SUN ShiNing ZHAO Kun leng wenxiu BAO RiMa XIAO LiZhi ZHANG ZhenWei State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum Department of Physics Capital Normal University

The application of terahertz（THz） technique in many fields like petroleum industry requires the high resolution and multifunction to realize the precise detection of different materials. In this study water vapor in atmosphere was scanned with shortand long-path THz spectrometers with different scan ranges. The full width at half maximum of the THz characteristic lines in long-path system reached less than 7 GHz and that in short achieved -5.5 GHz, indicating that the THz spectroscopy of water vapor can be used to calibrate THz devices. THz systems with right scan ranges could be a promising selection for the identification of solid, liquid and gaseous materials with very similar structures due to the high resolution. The research demonstrates that the multifunctional THz test can be realized through the balance of resolution and sampling space in many fields, such as oil-gas industry.

关键词： terahertz water vapor resolution full width at half maximum

Characterizing the rock geological time by terahertz spectrum

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Science China(Physics,Mechanics & Astronomy) 2019年第1期62卷 95-98页

作者： wenxiu leng QingYan Li RiMa Bao Kun Zhao XinYang Miao YiZhang Li Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum

In the field of geology,it is necessary to get the information about the rock geological time,which includes absolute geologic age and relative geologic age .Tracing the evolutionary history of the earth is one of the research tasks of earth ***,space,material and motivation are the basic elements for studying geological processes and enviromnental evolution,and time is the basis for studying geological problems.A clear understanding of the interaction between the above elements will be able to clearly make sure the evolution of the earth and the conditions of rock ***,it is urgent to get the geochronological data of rocks for wide range comparison,so as to study the evolution trend and development rule of the earth's crust .

关键词： Characterizing geology understanding

Ni-Al-Fe系中NiAl(Fe)金属间化合物的析出强化

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稀有金属材料与工程 2010年第3期39卷 460-463页

作者：冷文秀田文怀北京科技大学北京100083 中国石油大学北京102249

研究Ni-Al-Fe系中B2型金属间化合物NiAl(Fe)的硬度随时效时间的变化,同时测定时效处理后含析出相的NiAl(Fe)金属间化合物的屈服强度随温度变化。结果表明,在所有实验温度区域内,NiAl(Fe)化合物的屈服强度均远高于单相NiAl;析出相为体心... 详细信息

研究Ni-Al-Fe系中B2型金属间化合物NiAl(Fe)的硬度随时效时间的变化,同时测定时效处理后含析出相的NiAl(Fe)金属间化合物的屈服强度随温度变化。结果表明,在所有实验温度区域内,NiAl(Fe)化合物的屈服强度均远高于单相NiAl;析出相为体心立方结构的α-Fe相;在时效初期α-Fe相呈球状,过时效之后变成平行于有序基体{100}晶面的板条状。通过透射电镜观察还确定变形过程中位错滑移矢量为。虽然α-Fe析出相的硬度低于NiAl(Fe)基体,但由于α-Fe析出相对运动位错有较强的钉扎作用而使基体得到强化。

关键词： α-Fe析出相时效硬化显微结构 NiAl(Fe)金属间化合物

Predictability of the upper ocean heat content in a Community Earth System Model ensemble prediction system

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Acta Oceanologica Sinica 2024年第1期43卷 1-10页

作者： Ting Liu wenxiu Zhong State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Atmospheric Sciences Sun Yat-Sen UniversityZhuhai 519082China

Upper ocean heat content(OHC)has been widely recognized as a crucial precursor to high-impact climate variability,especially for that being indispensable to the long-term memory of the *** the predictability of OHC using state-of-the-art climate models is invaluable for improving and advancing climate *** developed retrospective forecast experiments,based on a Community Earth System Model ensemble prediction system,offer a great opportunity to comprehensively explore OHC *** results indicate that the skill of actual OHC predictions varies across different oceans and diminishes as the lead time of prediction *** spatial distribution of the actual prediction skill closely resembles the corresponding persistence skill,indicating that the persistence of OHC serves as the primary predictive signal for its *** decline in actual prediction skill is more pronounced in the Indian and Atlantic oceans than in the Pacific Ocean,particularly within tropical ***,notable seasonal variations in the actual prediction skills across different oceans align well with the phase-locking features of OHC *** potential predictability of OHC generally surpasses the actual prediction skill at all lead times,highlighting significant room for improvement in current OHC predictions,especially for the North Indian Ocean and the Atlantic *** such improvements necessitates a collaborative effort to enhance the quality of ocean observations,develop effective data assimilation methods,and reduce model bias.

关键词： ocean heat content prediction skill retrospective forecast experiment

DiffGR:Detecting Differentially Interacting Genomic Regions from Hi-C Contact Maps

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Genomics, Proteomics & Bioinformatics 2024年第2期22卷 143-155页

作者： Huiling Liu wenxiu Ma Department of Statistics University of California RiversideRiversideCA 92521USA

Recent advances in high-throughput chromosome conformation capture(Hi-C)techniques have allowed us to map genome-wide chromatin interactions and uncover higher-order chromatin structures,thereby shedding light on the principles of genome architecture and ***,statistical methods for detecting changes in large-scale chromatin organization such as topologically associating domains(TADs)are still ***,we proposed a new statistical method,DiffGR,for detecting differentially interacting genomic regions at the TAD level between Hi-C contact *** utilized the stratum-adjusted correlation coefficient to measure similarity of local TAD *** then developed a nonparametric approach to identify statistically significant changes of genomic interacting *** simulation studies,we demonstrated that DiffGR can robustly and effectively discover differential genomic regions under various ***,we successfully revealed cell type-specific changes in genomic interacting regions in both human and mouse Hi-C datasets,and illustrated that DiffGR yielded consistent and advantageous results compared with state-of-the-art differential TAD detection *** DiffGR R package is published under the GNU General Public License(GPL)≥2 license and is publicly available at https://***/wmalab/DiffGR.

关键词： Hi-C Differential analysis Topologically associating domain Stratum-adjusted correlation coefficient Nonparametric method

Ni-Al-Fe中NiAl／Fe互为基体／析出相的组织特征

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稀有金属 2009年第2期33卷 185-190页

作者：冷文秀田文怀北京科技大学材料科学与工程学院北京100083 中国石油大学北京数理系北京102249

以Ni-Al-Fe系合金中B2型金属间化合物NiAl(Fe)和α-Fe(Ni,Al)固溶体互为基体和析出相,主要研究了时效处理对其强度的影响及其时效组织特征。结果表明,以NiAl(Fe)作为基体并经时效处理后,α-Fe(Ni,Al)析出相对NiAl(Fe)有时效硬化作用,含... 详细信息

以Ni-Al-Fe系合金中B2型金属间化合物NiAl(Fe)和α-Fe(Ni,Al)固溶体互为基体和析出相,主要研究了时效处理对其强度的影响及其时效组织特征。结果表明,以NiAl(Fe)作为基体并经时效处理后,α-Fe(Ni,Al)析出相对NiAl(Fe)有时效硬化作用,含有α-Fe(Ni,Al)析出相的NiAl(Fe)在所有实验温度区域内,其屈服强度均远高于单相NiAl的屈服强度。透射电镜的观察揭示出α-Fe(Ni,Al)析出相为体心立方结构,时效初期是球状,相邻析出相合并变成板条状,平行于有序基体的{100}晶面析出。当以α-Fe(Ni,Al)相为基体进行时效处理后,NiAl(Fe)析出相对α-Fe(Ni,Al)也起到了析出强化的作用。通过透射电镜的观察可知,NiAl(Fe)析出相的形态在时效初期时呈球状,随着时效时间的延长,析出相会长大并呈四方六面体,但相邻析出相之间不会合并。

关键词：析出时效硬化显微结构金属间化合物

Ru-doped functional porous materials for electrocatalytic water splitting

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Nano Research 2024年第3期17卷 982-1002页

作者： Chongao Tian Rui Liu Yu Zhang wenxiu Yang Bo Wang Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Advanced Technology Research Institute(Jinan)Advanced Research Institute of Multidisciplinary ScienceSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Library Beijing Institute of TechnologyBeijing 100081China

Electrolytic water splitting(EWS)is an attractive and promising technique for the production of hydrogen ***,the sluggish kinetic rate of hydrogen/oxygen evolution reactions leads to a high overpotential and low energy *** to date,Pt/Ir-based nanocatalysts have become the state-of-the-art EWS catalysts,but disadvantages such as high cost and low earth abundance greatly limit their applications in EWS *** an attractive candidate for the Pt/Ir catalysts,series of Ru-based nanomaterials have aroused much attention for their low price,Pt-like hydrogen bond strength,and high EWS *** particular,Ru-doped functional porous materials have been becoming one of the most representative EWS catalysts,which can not only achieve the dispersion and adjustment for active Ru sites,but also simultaneously solve the problems of mass transfer and catalytic conversion in *** this review,the design and preparation strategies of Ru-doped functional porous materials toward EWS in recent years are summarized,including Ru-doped metal organic frameworks(MOFs),Ru-doped porous organic polymers(POPs),and their ***,detailed structure–activity relationships induced by the tuned geometric/electronic structures of Ru-doped functional porous materials are further depicted in this *** but not least,the challenges and perspectives of Ru-doped functional porous materials catalysts are reasonably proposed to provide fresh ideas for the design of Ru-based EWS catalysts.

关键词： Ru-based catalyst functional porous materials electrolytic water splitting oxygen evolution reaction hydrogen evolution reaction

Opportunities and Challenges in Advancing Plant Research with Single-cell Omics

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Genomics, Proteomics & Bioinformatics 2024年第2期22卷 13-26页

作者： Mohammad Saidur Rhaman Muhammad Ali wenxiu Ye Bosheng Li Peking University Institute of Advanced Agricultural Sciences Shandong Laboratory of Advanced Agricultural Sciences in WeifangWeifang 261325China

Plants possess diverse cell types and intricate regulatory mechanisms to adapt to the ever-changing environment of *** strategies have been employed to study cell types and their developmental progressions,including single-cell sequencing methods which provide high-dimensional catalogs to address biological *** recent years,single-cell sequencing technologies in transcriptomics,epigenomics,proteomics,metabolomics,and spatial transcriptomics have been increasingly used in plant science to reveal intricate biological relationships at the single-cell ***,the application of single-cell technologies to plants is more limited due to the challenges posed by cell *** review outlines the advancements in single-cell omics technologies,their implications in plant systems,future research applications,and the challenges of single-cell omics in plant systems.

关键词： Multi-omics Single-cell transcriptomics Spatial transcriptomics Single-cell epigenomics Single-cell proteomics

Wintertime Arctic Sea-Ice Decline Related to Multi-Year La Niña Events

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Advances in Atmospheric Sciences 2024年第9期41卷 1680-1690页

作者： wenxiu ZHONG Qian SHI Qinghua YANG Jiping LIU Song YANG School of Atmospheric Sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen UniversityGuangzhou 510275China

Arctic sea ice has undergone a significant decline in the Barents-Kara Sea(BKS)since the late *** studies have shown that the decrease in sea ice caused by increased poleward moisture transport is modulated by tropical sea temperature changes(mainly referring to La Niña events).The occurrence of multi-year La Niña(MYLA)events has increased significantly in recent decades,and their impact on Arctic sea ice needs to be further *** this study,we investigate the relationship between sea-ice variation and different atmospheric diagnostics during MYLA and other La Niña(OTLA)*** decline in BKS sea ice during MYLA winters is significantly stronger than that during OTLA *** is because MYLA events tend to be accompanied by a warm Arctic-cold continent pattern with a barotropic high pressure blocked over the Urals ***,more frequent northward atmospheric rivers intrude into the BKS,intensifying longwave radiation downward to the underlying surface and melting the BKS sea ***,in the early winter of OTLA years,a negative North Atlantic Oscillation presents in the high latitudes of the Northern Hemisphere,which obstructs the atmospheric rivers to the south of *** infer that such a different response of BKS sea-ice decline to different La Niña events is related to stratospheric *** the rapid climate changes in the past,more frequent MYLA events may account for the substantial Arctic sea-ice loss in recent decades.

关键词： Arctic sea ice multi-year ENSO Ural blocking atmospheric river Barents-Kara Sea