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High temperature superconductor Na_(2)B_(2)H stabilized by hydrogen intercalation under ambient pressure

Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 141-148页

作者： Wendi Zhao Defang Duan Zhengtao Liu Zihao Huo shumin guo Decheng An Maosheng Miao Tian Cui State Key Laboratory of Superhard Materials Key Laboratory of Material Simulation Methods&Software of Ministry of EducationCollege of PhysicsJilin UniversityChangchun 130012China Department of Chemistry and Biochemistry California State UniversityNorthridgeCalifornia 91330USA Department of Earth Science University of CaliforniaSanta BarbaraCalifornia 93106USA Institute of High Pressure Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China

Hydrogenated metal borides have attracted much attention due to their potential high-temperature ***,we propose a new strategy for hydrogen intercalation tuning the stability and superconductivity of the boron honeycomb sublattice,and predict an unprecedented layered compound Na_(2)B_(2)H,which hosts excellent ***,the superconducting transition temperature(Tc)of Na_(2)B_(2)H reaches 42 K at ambient *** Tcvalue can be further increase to 63 K under 5%biaxial tensile *** excellent superconductivity originates from the strong electron-phonon coupling between theσ-bonding bands near the Fermi level and the B-B stretching optical E *** interstitial electron localization and crystal orbitals of the H-intercalated Na ion layer well match the boron honeycomb lattice and act as a chemical template to stabilize the B ***,the introduction of hydrogen tuned the Fermi level,and the coupling vibration of Na and H ions effectively enhanced the dynamic stability of the ***_(2)B_(2)H represents a new family of layered high-temperature superconductors,and the strategy of stabilizing the honeycomb boron sublattice via chemical template hosts great potential for application to more layered compounds.

关键词： superconductivity hydrogenation metal borides electron-phonon coupling

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GASEOUS REACTIVE NITROGEN LOSSES FROM ORCHARDS,VEGETABLES AND TEA PLANTATIONS

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Frontiers of Agricultural Science and Engineering 2023年第2期10卷 155-166页

作者： Jinyang WANG Pinshang XU Haiyan LIN shumin guo Zhaoqiang HAN Jianwen ZOU Key Laboratory of Green and Low-carbon Agriculture in Southeastern China Ministry of Agriculture and Rural AffairsCollege of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource UtilizationNanjing 210095China.

Nitrogen fertilizer application has accelerated the agricultural soil N cycle while ensuring food *** reactive N emissions from orchards,vegetables and tea plantations(OVT)are less understood than those from cereal *** paper presents a compilation of data on soil ammonia,nitrous oxide,and nitric oxide emissions from 1454 OVT systems at 184 unique experimental locations worldwide aiming to investigate their emission characteristics,emission factors(EF),and contribution to total farmland ***_(3)and N_(2)O emissions from orchards and N_(2)O and NO emissions from vegetable production were significantly higher in China than in the rest of the world,regardless of fertilizer application,while N_(2)O emissions from tea plantations were lower than for *** EF of NH_(3)for vegetables was close to the global mean value with urea application but significantly higher than that of *** EF of N_(2)O in orchards and vegetables was comparable to the global median value,while in tea plantations,the value was 2.3 times higher than the global median *** estimates suggest that direct emissions of NH_(3),N_(2)O,and NO from OVT systems are equivalent to approximately a quarter,two thirds and a half of the total farmland in China,*** research needs to strengthen observational field studies in establishing standard sampling methods for gaseous N emissions and implementing knowledge-based management measures to help achieve the green development of agriculture.

关键词： fruit greenhouse gas green development fertilizer management climate change

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Congestive heart failure in COX2 deficient rats

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Science China(Life Sciences) 2021年第7期64卷 1068-1076页

作者： Qiangyou Wan Deping Kong Qian Liu shumin guo Chenchen Wang Yan Zhao Zun-Ji Ke Ying Yu Academy of Integrative Medicine Shanghai University of Traditional Chinese MedicineShanghai 201203China Department of Pharmacology and Tianjin Key Laboratory of Inflammatory Biology Key Laboratory of Immune Microenvironment and Disease(Ministry of Education)School of Basic Medical SciencesTianjin Medical UniversityTianjin 300070China Shanghai Institute of Nutrition and Health Shanghai Institutes for Biological SciencesUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200031China

Non-steroidal anti-inflammatory drugs(NSAIDs)inhibit prostaglandin(PG)formation by targeting cyclooxygenase(COX)1 and ***-term use of NSAIDs that selectively inhibit COX2 increases the risk for thrombotic events,cardiac failure,and ***,the underlying mechanisms remain *** this study,COX1-and COX2-deficient rats were created via Cas9/RNA-mediated gene *** genotyping and Western blot analysis confirmed successful generation of COX1^(-/-) and COX2^(-/-) *** COX1^(-/-) rats grew normally,while more than 70%of COX2^(-/-) rats after wean died within 2 *** showed markedly reduced left ventricular ejection fraction and fractional shortening in adult COX2^(-/-) rats compared to those in wildtype(WT)*** analysis revealed accumulation of inflammatory cells and severe interstitial and perivascular fibrosis in COX2^(-/-)cardiac ***,cardiac ATP and acetyl-Co A production was dramatically decreased in COX2^(-/-) ***,the expression of genes related to mitochondrial oxidation,such as those that encode for subunits of pyruvate dehydrogenase complex and acyl Co A dehydrogenases,were downregulated,while glycolytic hexokinase 1(HK1)was upregulated in COX2^(-/-) heart *** observations indicate that COX2-deficient rats developed spontaneously heart failure,likely as a result of dysregulated cardiac energy metabolism.

关键词： NSAID cyclooxygenase prostaglandin heart failure energy metabolism

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Divergent effects of biochar amendment and replacing mineral fertilizer with manure on soil respiration in a subtropical tea plantation

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Biochar 2023年第1期5卷 1259-1272页

作者： Zhaoqiang Han Pinshang Xu Zhutao Li shumin guo Shuqing Li Shuwei Liu Shuang Wu Jinyang Wang Jianwen Zou Key Laboratory of Green and Low-Carbon Agriculture in Southeastern China Ministry of Agriculture and Rural AffairsCollege of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095JiangsuChina Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource UtilizationNanjing 210095China

Applying biochar amendment and manure in tea plantation ecosystems can diminish soil acidification and ***,the impact of these practices on soil respiration and associated mechanisms remains *** this study,we combined a two-year field experiment and laboratory analyses based on soil properties,functional genes,and microbial co-occurrence networks to explore the determinants of soil respiration intensity in a subtropical tea plantation with biochar amendment and manure *** results showed that the effect of biochar amendment on soil respiration was *** biochar amendment increased bacterial richness and Shannon index,biochar amendment did not alter the abundance of species associated with C-cycling functional *** directly adding recalcitrant C to the soil,biochar also indirectly enhanced C sequestration by weakly increasing soil carbon dioxide(CO_(2))***,replacing mineral fertilizer with manure significantly stimulated soil respiration in the tea plantation,resulting in a 36%increase in CO_(2) emissions over two *** increase in CO_(2) emissions under the manure treatment was mainly attributed to the increased soil labile C pool,the activity of hydrolytic enzymes(e.g.,cellobiohydrolase and acetylglucosaminidase),and the relative abundance of functional genes associated with the *** may also be related to the application of manure that increased the abundance of Gemmatimonadetes and altered ecological clusters in bacterial co-occurrence *** correlation network analysis suggested that Gemmatimonadetes might be the potential hosts for C-cycling genes due to their strong positive correlation with the abundance of C-cycling ***,these findings provide new insights into soil respiration under biochar amendment and manure application in tea plantations and broaden the options for carbon sequestration in soils.

关键词： C dynamics Biochar SOC chemical composition C-cycle genes Microbial community

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Benefits and limitations of biochar for climate-smart agriculture:a review and case study from China

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Biochar 2023年第1期5卷 1319-1342页

作者： Xiaomeng Bo Zhiwei Zhang Jinyang Wang shumin guo Zhutao Li Haiyan Lin Yawen Huang Zhaoqiang Han Yakov Kuzyakov Jianwen Zou Key Laboratory of Green and Low-Carbon Agriculture in Southeastern China Ministry of Agriculture and Rural AffairsCollege of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource UtilizationNanjing 210095China Department of Soil Science of Temperate Ecosystems Department of Agricultural Soil ScienceUniversity of Gottingen37077 GottingenGermany Peoples Friendship University of Russia(RUDN University) 117198 MoscowRussia Institute of Environmental Sciences Kazan Federal University420049 KazanRussia

Biochar has gained significant attention in agricultural and environmental research over the last two *** comprehensive review evaluates the effects of biochar on soil organic carbon(SOC),emission of non-CO_(2) greenhouse gases,and crop yield,including related mechanisms and major influencing *** impacts of biochar on SOC,methane and nitrous oxide emissions,and crop yield are controlled by biochar and soil properties and management ***-temperature biochar produced from lignin-rich feedstocks may decrease methane and nitrous oxide emissions in acidic soils and strengthen long-term carbon sequestration due to its stable aromatic *** contrast,low-temperature biochar from manure may increase crop yield in low-fertility *** biochar to farmlands in China can increase SOC content by 1.9 Pg C and reduce methane and nitrous oxide emissions by 25 and 20 Mt CO_(2)-eq year^(−1),respectively,while increasing crop yields by 19%.Despite the increasing evidence of the positive effects of biochar,future research needs to explore the potential factors that could weaken or hinder its capacity to address climate change and secure crop *** conclude that biochar is not a universal solution for global cropland;however,targeted applications in fields,landscapes,or regional scales,especially in low fertility and sandy soils,could realize the benefits of biochar as a climate-smart measure.

关键词： Biochar Carbon sequestration Greenhouse gas Food security Mitigation potential

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Broadband high-efficiency dielectric metalenses based on quasi-continuous nanostrips

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Opto-Electronic Advances 2024年第5期7卷 43-51页

作者： Xiaohu Zhang Qinmiao Chen Dongliang Tang Kaifeng Liu Haimo Zhang Lintong Shi Mengyao He Yongcai guo shumin Xiao Key Laboratory of optoelectronic Technology and Systems of the Education Ministry of China Chongqing UniversityChongqing 400044China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Benefiting from the abrupt phase changes within subwavelength thicknesses,metasurfaces have been widely applied for lightweight and compact optical *** broadband and high-efficiency characteristics are highly attractive for the practical implementation of ***,current metasurface devices mostly adopt discrete micro/nano structures,which rarely realize both merits *** this paper,dielectric metasurfaces composed of quasi-continuous nanostrips are proposed to overcome this *** quasi-continuous nanostrips metasurface,a normal focusing metalens and a superoscillatory lens overcoming the diffraction limit are designed and experimentally *** quasi-continuous metadevices can operate in a broadband wavelength ranging from 450 nm to 1000nm and keep a high power *** average efficiency of the fabricated metalens reaches 54.24%,showing a significant improvement compared to the previously reported metalenses with the same *** proposed methodology can be easily extended to design other metadevices with the advantages of broadband and high-efficiency in practical optical systems.

关键词： broadband high-efficiency metalens sub-diffraction quasi-continuous

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煤储层吸附/解吸等温曲线测试技术

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石油实验地质 1999年第1期21卷 76-81页

作者：周胜国郭淑敏华北石油地质局规划设计研究院

煤岩吸附／解吸等温曲线测试，是取得煤层气储层评价关键参数的技术之一。本文介绍了模拟储层条件下的等温吸附／解吸测试技术，为煤层气储层研究提供可靠资料和参数奠定了基础。

关键词：等温线测试储集层吸附解吸煤储集层

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有针对性的扑杀禽类对控制禽流感传播的有效性研究

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系统科学与数学 2016年第8期36卷 1358-1366页

作者：郭树敏李学志韶关学院数学与统计学院韶关512005 安阳工学院数理学院安阳455000

研究了一类既包含高致病禽流感病毒,又包含低致病禽流感病毒的人禽动力学模型,还考虑到人类会对染病的禽类进行有针对性的宰杀.通过讨论得到了两个基本再生数R_1,R_2,并得到了无病平衡态和染病平衡态的全局稳定性条件.证明了当两类病毒... 详细信息

研究了一类既包含高致病禽流感病毒,又包含低致病禽流感病毒的人禽动力学模型,还考虑到人类会对染病的禽类进行有针对性的宰杀.通过讨论得到了两个基本再生数R_1,R_2,并得到了无病平衡态和染病平衡态的全局稳定性条件.证明了当两类病毒还未共存时,可以通过有效治疗和宰杀禽类来控制疾病传播;当两类病毒已共存时,治疗和宰杀禽类反而会促使两类病毒共存,并发展为地方病.因此只有趁两类病毒还未共存时控制,才能可有效抑制禽流感在人类的传播.

关键词：动力学模型基本再生数稳定疾病控制

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煤样逸散气量的求取方法

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焦作工学院学报 1999年第2期18卷 83-88页

作者：郭淑敏华北石油局规划设计研究院

煤样逸散气量的确定是准确求取含气量的关键，方法不同，求取的结果也不同．本文介绍了求取煤样逸散气量的４种方法，即：直接法、史－威法、多项式回归法、阿莫科曲线拟合法等．并结合实际资料对比了各种方法的求取结果，得出了不同方... 详细信息

煤样逸散气量的确定是准确求取含气量的关键，方法不同，求取的结果也不同．本文介绍了求取煤样逸散气量的４种方法，即：直接法、史－威法、多项式回归法、阿莫科曲线拟合法等．并结合实际资料对比了各种方法的求取结果，得出了不同方法所求结果的一般规律，为准确评估煤层含气量提供了依据．

关键词：逸散气量直接法多项式回归法天然气煤样

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基于国际农业发展条件大数据比较的我国农业发展态势研究

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中国农业信息 2022年第4期34卷 72-84页

作者：郭淑敏中国农业科学院农业资源与农业区划研究所

【目的】在“数字地球”大背景下，从国际视角认清我国农业发展的现状与态势，找准其优势与劣势，采取积极对措，使我国尽快实现由农业大国向农业强国迈进。【方法】文章以我国为研究对象，通过我国与亚洲4国及亚州4国平均、欧洲8国平... 详细信息

【目的】在“数字地球”大背景下，从国际视角认清我国农业发展的现状与态势，找准其优势与劣势，采取积极对措，使我国尽快实现由农业大国向农业强国迈进。【方法】文章以我国为研究对象，通过我国与亚洲4国及亚州4国平均、欧洲8国平均及北美洲2国平均4个方面的9个指标，运用了统计分析、比较与综合等方法进行比较分析。【结果】我国农业自然条件用水效率有待提升，化肥用量依然有很大减量空间；从农林牧渔业就业人口的比重和农业增加值占GDP比重劳动就业条件看，虽呈明显下降趋势，但仍相对较高；基础设施条件虽大有改善，但公路密度、互联网网民比重及千人拥有移动电话量明显滞后，有很大提升空间；农业营商环境和信贷融资便利度方面，虽进步速度最快，但距离一流强国还有较远距离。【结论】我国农业应继续加强水资源利用率研究，减少化肥施用量，促进农业资源高效利用和绿色发展；继续加大一二三产业融合和农业产业化步伐，降低农林牧渔业产值占GDP比重和农林牧渔业就业人口比重，促进国家工业化发展来反哺农业；继续加大农业基础设施投资和建设力度，以尽快提高公路密度和互联网网民比重等，提高农业现代化步伐；继续加快营商环境改革创新力度，使农业企业化和社会化服务全方位提档升级，以促进我国由农业大国向农业强国迈进。

关键词：国际农业发展条件大数据比较中国农业发展态势

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