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Himalayas as a global hot spot of springtime stratospheric intrusions:Insight from isotopic signatures in sulfate aerosols

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Research in Cold and Arid Regions 2024年第1期16卷 5-13页

作者： Kun Wang ShiChang Kang Mang lin PengFei Chen Chaoliu li xiufeng Yin Shohei Hattori Teresa L.Jackson JunHua Yang YiXi liu Naohiro Yoshida Mark HThiemens State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)LanzhouGansu 730000China State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryCASGuangzhouGuangdong 510640China University of Chinese Academy of Sciences Beijing 100049China International Center for Isotope Effects Research(ICIER) School of Earth Sciences and EngineeringNanjing UniversityNanjingJiangsu 210023China Frontiers Science Center for Critical Earth Material Cycling State Key Laboratory for Mineral Deposits ResearchSchool of Earth Sciences and EngineeringNanjing UniversityNanjingJiangsu 210023China Department of Chemical Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of Technology4259 Nagatsuta-choMidori-kuYokohamaKanagawa 226-8502Japan Department of Chemistry and Biochemistry University of California San DiegoLa JollaCA 92093-0021USA Earth-life Science Institute Tokyo Institute of TechnologyMeguro-kuTokyo 152-8551Japan National Institute of Information and Communications Technology KoganeiTokyo 184-8795Japan

Downward transport of stratospheric air into the troposphere(identified as stratospheric intrusions)could potentially modify the radiation budget and chemical of the Earth's surface *** the highest and largest plateau on earth,the Tibetan Plateau including the Himalayas couples to global climate,and has attracted widespread attention due to rapid warming and cryospheric *** studies recognized strong stratospheric intrusions in the Himalayas but are poorly understood due to limited direct evidences and the complexity of the meteorological dynamics of the third ***^(35)S is a radioactive isotope predominately produced in the lower stratosphere and has been demonstrated as a sensitive chemical tracer to detect stratospherically sourced air mass in the planetary boundary ***,we report 6-month(April–September 2018)observation of^(35)S in atmospheric sulfate aerosols(^(35)SO_(4)^(2-))collected from a remote site in the Himalayas to reveal the stratospheric intrusion phenomenon as well as its potential impacts in this *** the sampling campaign,the^(35)SO_(4)^(2-)concentrations show an average of 1,070±980 atoms/m^(3).In springtime,the average is 1,620±730 atoms/m^(3),significantly higher than the global existing data measured so *** significant enrichments of^(35)SO_(4)^(2-)measured in this study verified the hypothesis that the Himalayas is a global hot spot of stratospheric intrusions,especially during the springtime as a consequence of its unique geology and atmospheric *** combined with the ancillary evidences,e.g.,oxygen-17 anomaly in sulfate and modeling results,we found that the stratospheric intrusions have a profound impact on the surface ozone concentrations over the study region,and potentially have the ability to constrain how the mechanisms of sulfate oxidation are affected by a change in plateau atmospheric properties and *** study provides new observational constraints on stra

关键词： Himalayas Stratospheric intrusions Cosmogenic^(35)SO_(4)^(2-) Ozone Atmospheric oxidation

Combinations of Hd2 and Hd4 genes determine rice adaptability to Heilongjiang Province, northern limit of China

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Journal of Integrative Plant Biology 2015年第8期57卷 698-707页

作者： xiufeng li Huazhao liu Maoqing Wang Hualong liu Xiaojie Tian Wenjia Zhou Tianxiao Lü Zhenyu Wang Chengcai Chu Jun Fang Qingyun Bu Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design Breeding the Chinese Academy of Sciences University of Chinese Academy of Sciences Rice Research Institute Heilongjiang Academy of Land Reclamation Sciences Beidahuang Kenfeng Seed Co.Ltd. College of Agriculture Northeast Agricultural University State Key Laboratory of Plant Genomics Institute of Genetics and Developmental Biology Chinese Academy of Sciences

Heading date is a key trait in rice domestication and adaption, and a number of quantitative trait loci（QTLs）have been identified. The rice（Oryza sativa L.） cultivars in the Heilongjiang Province, the northernmost region of China,have to flower extremely early to fulfill their life ***, the critical genes or different gene combinations controlling early flowering in this region have not been determined. QTL and candidate gene analysis revealed that Hd2/Ghd7.1/Os PRR37 plays a major role in controlling rice distribution in Heilongjiang. Further association analysis with a collection of rice cultivars demonstrated that another three major QTL genes（Hd4/Ghd7, Hd5/DTH8/Ghd8, and Hd1）also participate in regulating heading date under natural long day（LD） conditions. Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 are two major QTLs and function additively. With the northward rice cultivation, the Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 haplotypes became non-functional alleles. Hd1 might be non-functional in most Heilongjiang rice varieties,implying that recessive hd1 were selected during local rice breeding. Non-functional Hd5/DTH8/Ghd8 is very rare, but constitutes a potential target for breeding extremely early flowering cultivars. Our results indicated that diverse genetic combinations of Hd1, Hd2, Hd4, and Hd5 determined the different distribution of rice varieties in this northernmost province of China.

关键词： Rice heading date Hdl Hd2 Hd4 Hd5

Improvement real time performance of robot pose optic fiber sensor on screw assem blies

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光通信技术 1999年第4期 305-309页

作者： li xiufeng,liu Guixiong (Dept.of Machatronic Engineering,South China University of Technology,Guangzhou,510640)

The paper firstly introduces screw direction detecting *** proposes a kind of neural network based parallel arithmetic in order to treat the circumstances of complicated sensing *** arithmetic can greatly enlarge the real time treatment ability of sensors,and is successively applied in the pose rectifying of robot screw flexible assembiles.

关键词： Optic fiber sensors BP network arithmetic Signal real time treatment

High-efficiency breeding of early-maturing rice cultivars via CRISPR/Cas9-mediated genome editing

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Journal of Genetics and Genomics 2017年第3期44卷 175-178页

作者： xiufeng li Wenjia Zhou Yuekun Ren Xiaojie Tian Tianxiao Lv Zhenyu Wang Jun Fang Chengcai Chu Jie Yang Qingyun Bu Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design BreedingChinese Academy of SciencesHarbin 150081China Graduate University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Institute of Food Crops Jiangsu Academy of Agricultural SciencesNanjing 210014China

Rice is a staple food for more than half of the human *** has been estimated that by 2030,40%more rice needs to be produced in order to meet the growing demand（Khush,2005）.One of the strategies to improve rice productivity is to enlarge rice growth areas, such as the northward expansion of the growth region in Heilongjiang Province, the northernmost region of China （li et al., 2015）. However, the northward cultivation is accompanied with daylength extension and temperature decrease, which are unfavor- able for rice, a tropical short-day plant, to complete flowering and seed setting. Thus, the need for early-maturing rice cultivars with extremely low photoperiod sensitivity is urgent.

关键词： In than High-efficiency breeding of early-maturing rice cultivars via CRISPR/Cas9-mediated genome editing

钛基金属有机框架材料光催化分解水制氢的研究进展

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稀有金属 2023年第12期47卷 1624-1641页

作者：吴鹏李绍元席风硕李秀凤吕国强马文会昆明理工大学冶金与能源工程学院真空冶金国家工程研究中心昆明650093

钛基金属有机框架(Ti-MOFs)因其优异的光电性质和光催化性能、化学稳定性和低毒性以及多样化的结构,被认为是光催化分解水制氢领域中最具吸引力的MOFs之一。综述了近年来Ti-MOFs及其复合材料和衍生多孔材料在光催化制氢领域的进展。通... 详细信息

钛基金属有机框架(Ti-MOFs)因其优异的光电性质和光催化性能、化学稳定性和低毒性以及多样化的结构,被认为是光催化分解水制氢领域中最具吸引力的MOFs之一。综述了近年来Ti-MOFs及其复合材料和衍生多孔材料在光催化制氢领域的进展。通过染料敏化或选择合适的官能团和金属节点会对Ti-MOFs的光响应及光催化活性产生重要影响。为进一步提高光催化析氢性能,可引入金属离子或与其他半导体结合形成多功能复合材料。此外,通过在合适的条件下煅烧Ti-MOFs前驱体可制备更多新颖高效的光催化剂。最后,从关键的角度讨论了Ti-MOFs及其衍生多孔材料未来在光催化分解水制氢领域的机遇和挑战。

关键词：钛基金属有机框架(Ti-MOFs) 光催化剂多孔材料水解制氢

OsMKKK70 regulates grain size and leaf angle in rice through the OsMKK4-OsMAPK6-OsWRKY53 signaling pathway

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Journal of Integrative Plant Biology 2021年第12期63卷 2043-2057页

作者： Zhiqi liu Enyang Mei Xiaojie Tian Mingliang He Jiaqi Tang Min Xu Jiali liu Lu Song xiufeng li Zhenyu Wang Qingjie Guan Qijiang Xu Qingyun Bu Key Laboratory of Saline-alkali Vegetation Ecology Restoration(Northeast Forestry University) Ministry of EducationHarbin 150040China College of life Science Northeast Forestry UniversityHarbin 150040China Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design BreedingCASHarbin 150081China University of Chinese Academy of Sciences Beijing 100049China School of Laboratory Medicine Youjiang Medical University for NationalitiesBaise 533000China The Innovative Academy of Seed Design Chinese Academy of SciencesBeijing 100101China

Grain size and leaf angle are key agronomic traits that determine final yields in ***,the underlying molecular mechanisms are not well *** we demonstrate that the Oryza sativa Mitogen Activated Protein Kinase Kinase Kinase OsMKKK70 regulates grain size and leaf angle in *** OsMKKK70 caused plants to produce longer *** osmkkk62/70 double mutant and the osmkkk55/62/70 triple mutant displayed significantly smaller seeds and a more erect leaf angle compared to the wild type,indicating that OsMKKK70 functions redundantly with its homologs Os MKKK62 and Os *** analysis demonstrated that OsMKKK70 is an active kinase and that OsMKKK70 interacts with Os MKK4 and promotes Os MAPK6 *** addition,the osmkkk62/70 double mutant showed reduced sensitivity to Brassinosteroids(BRs).Finally,overexpressing constitutively active Os MKK4,Os MAPK6,and Os WRKY53 can partially complement the smaller seed size,erect leaf,and BR hyposensitivity of the osmkkk62/70 double *** together,these findings suggest that OsMKKK70 might regulate grain size and leaf angle in rice by activating Os MAPK6 and that OsMKKK70,Os MKK4,Os MAPK6,and Os WRKY53 function in a common signaling pathway that controls grain shape and leaf angle.

关键词： Brassinosteroids MAPK signaling OsMKKK70 rice seed size

交联度对交联聚乙烯/有机化蒙脱土纳米复合材料拉伸性能和介电性能的影响

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电工技术学报 2023年第5期38卷 1154-1165页

作者：董芸滋高嫄李秀峰韩圣斌董瑞雪山东理工大学电气与电子工程学院淄博255000

为了研究交联度对纳米复合材料拉伸性能和介电性能的影响,通过调控交联时间,制备了不同交联度的交联聚乙烯/有机化蒙脱土(XLPE/OMMT)纳米复合材料。采用X射线衍射(XRD)测试判断蒙脱土的插层分散状态和试样聚集态结构的变化,利用扫描电... 详细信息

为了研究交联度对纳米复合材料拉伸性能和介电性能的影响,通过调控交联时间,制备了不同交联度的交联聚乙烯/有机化蒙脱土(XLPE/OMMT)纳米复合材料。采用X射线衍射(XRD)测试判断蒙脱土的插层分散状态和试样聚集态结构的变化,利用扫描电子显微镜(SEM)观察试样的结晶形态,并对其拉伸性能、电导-温度特性、介电常数、介质损耗及击穿场强进行了测试。结果表明:交联形成的三维网状结构抑制了晶体生长,且晶体尺寸和结晶度随交联度的增加而不断减小;剥离分散的OMMT在XLPE/OMMT中充当了物理交联点,与交联键共同作用,提高了纳米复合材料的拉伸强度,且不断完善的交联网络,使复合材料的弹性模量增大,韧性增强。纳米复合材料的电导率随温度升高而增大,其活化能的大小与交联度和OMMT的界面区域有关。完善的交联网络和均匀分布的界面区,增加了势垒,提高了复合材料的活化能。交联度的增加,形成较强的分子间作用力,阻碍了偶极子和侧基的转向极化,使介电常数和介质损耗角正切值减小;OMMT的加入和交联结构的完善,共同提高了复合材料的击穿场强;但过度交联会影响OMMT在基体中的分散程度,使OMMT片层发生微重排,进而导致OMMT与基体的界面结合力下降,劣化的OMMT排列和分散,使自由电子易脱离束缚,对晶格结构造成破坏,增加了复合材料的微观缺陷,使击穿场强降低。

关键词：交联度纳米复合材料交联聚乙烯有机化蒙脱土介电性能

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基于正交设计的真空灭弧室电场特性分析

高压电器 2023年第10期59卷 30-37页

作者：王文成张朋李秀峰李平安常锦涛国网山东金乡县供电公司山东济宁272000 淄博职业学院电子电气工程学院山东淄博255000 山东理工大学电气与电子工程学院山东淄博255000

采用有限元法对12 kV真空灭弧室的电场特性进行了单因素分析,结合SPSS软件对其进行了正交回归分析,选取触头圆倒角、触头开距、主屏蔽罩半径、主屏蔽罩卷边半径、主屏蔽罩卷边角度和主屏蔽罩坡度这6个主要参数进行综合优化研究。得到了... 详细信息

采用有限元法对12 kV真空灭弧室的电场特性进行了单因素分析,结合SPSS软件对其进行了正交回归分析,选取触头圆倒角、触头开距、主屏蔽罩半径、主屏蔽罩卷边半径、主屏蔽罩卷边角度和主屏蔽罩坡度这6个主要参数进行综合优化研究。得到了电场特性和设计参数之间的回归方程,找出了影响电场特性的显著因素。研究结果表明:触头圆倒角和触头开距对真空灭弧室典型点的电场强度有高度显著影响,主屏蔽罩半径对真空灭弧室典型点的电场强度有显著影响;触头圆倒角和触头开距对真空灭弧室触头处最大电场强度有显著影响;主屏蔽罩卷边半径和主屏蔽罩坡度对真空灭弧室瓷壳处沿面电场分量最大场强有显著影响。研究结果可为真空灭弧室的小型化提供理论依据。

关键词：真空灭弧室电场强度有限元正交试验设计优化

基于Android平台的林业调查辅助APP的设计研发

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南方林业科学 2022年第5期50卷 61-64,73页

作者：李秀峰新罗区大池镇人民政府福建新罗364000

Android平台凭借其稳定性和开放性吸引了大量的用户和开发者,成为了目前发展最快、用户最多的移动智能操作系统。本文设计并实现的基于Android平台的林业调查手机应用程序,已经获得中华人民共和国国家版权局计算机软件著作权登记证书。... 详细信息

Android平台凭借其稳定性和开放性吸引了大量的用户和开发者,成为了目前发展最快、用户最多的移动智能操作系统。本文设计并实现的基于Android平台的林业调查手机应用程序,已经获得中华人民共和国国家版权局计算机软件著作权登记证书。应用程序主要设计原木材积计算、二元立木材积计算、罗盘仪换算、平均树高胸径计算、定位经纬度并转换3度带和6度带坐标等功能,为林业生产和森林资源调查提供方便,具有较强的实践意义。

关键词： Android APP 林业设计