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Effects of Land Use Changes Across Different Urbanization Periods on Summer Rainfall in the Pearl River Delta Core Area

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International Journal of Disaster Risk Science 2023年第3期14卷 458-474页

作者： zhijun yao Guoru Huang School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research Center of Safety and Greenization for Water Conservancy Project Guangzhou 510640China

The Pearl River Delta(PRD)is one of the three urban agglomerations in China that have experienced rapid development.For this study,a core area of the PRD was identified,comprising the highly urbanized areas of Guangzhou,Foshan,Zhongshan,Zhuhai,Shenzhen,and Dongguan Cities.The expansion of these urban areas was tracked across three time periods—the year population urbanization rate exceeded 70%(2000),18 years before(1982),and 18 years after(2018).This study used the Weather Research and Forecasting(WRF)model to explore summer rainfall changes across different urbanization periods in the PRD core area.The results show that urban land expansion mainly occurred in the post urbanization period.Rainfall changes acros s different urbanization periods were roughly consistent with previously observed spatial and temporal changes accompanying urban expansion in the PRD core area.Extreme rainfall mainly increased in the post urbanization period,shifting rainstorm center towards the PRD core area.Further causal analysis revealed that land use changes affected rainfall by altering thermodynamics and water vapor transfer.The urban expansion changed the surface energy balance,resulting in increased surface heating and heat island effects.The heat island effects thickened the planetary boundary layer and increased vertical wind speeds,which initiated dry island effects,thereby causing more water vapor transportation to the atmosphere.Consequently,rainstorms and extreme rainfall events have become concentrated in urban areas.

关键词： Extreme rainfall Pearl River Delta core area South China Urban expansion process Urbanization periods Weather Research and Forecasting(WRF)model

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A facile strategy for large-scale production of 2D nanosheets exfoliated by three-roll milling

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Journal of Advanced Ceramics 2024年第1期13卷 11-18页

作者： Xin Wang Yang Xia Juntong Huang yao Su Zhi Chen Linlin Chen Zhaohui Wu zhijun Feng Huiyong Yang Xibao Li School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

Two-dimensional(2D)nanomaterials,such as graphene,MoS_(2),and MAX,have attracted increasing research attention in recent years due to their unique structural and performance advantages.However,their complex production processes and equipment requirements are significant issues affecting their widespread use.Here,with an exfoliation strategy using three-roll milling,we present a simple,cost-effective,and extensible method to produce multilayer graphene,BN,MoS_(2),and Ti_(3)AlC_(2) nanosheets.The roller and phenolic resin created three kinds of forces on the layered 2D materials,i.e.,shear forces,compressive forces,and adhesive forces,which exfoliated layered materials from their edges and surfaces into nanosheets.Subsequently,the exfoliated materials were ultrasonically washed with alcohol,treated with ultrasonic vibration,and centrifuged to obtain 2D nanomaterials.The easy operation and high yield are attractive for research based on the construction of high-performance 2D nanosheet-based devices at low cost.Herein,the obtained multilayer graphene and MoS_(2) nanosheets were used as anode materials of sodium/potassium-ion batteries,respectively,to test their electrochemical properties.Better performances are obtained compared with their primary bulk materials.

关键词： two-dimensional(2D)nanosheets exfoliation three-roll milling(TRM) sodium/potassium-ion batteries

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Comparison of surface water chemistry and weathering effects of two lake basins in the Changtang Nature Reserve,China

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Journal of Environmental Sciences 2016年第3期28卷 183-194页

作者： Rui Wang Zhaofei Liu Liguang Jiang zhijun yao Junbo Wang Jianting Ju Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100085China

The geochemistry of natural waters in the Changtang Nature Reserve,northern Tibet,can help us understand the geology of catchments,and provide additional insight in surface processes that influence water chemistry such as rock weathering on the Qinghai–Tibet Plateau.However,severe natural conditions are responsible for a lack of scientific data for this area.This study represents the first investigation of the chemical composition of surface waters and weathering effects in two lake basins in the reserve（Lake Dogaicoring Qiangco and Lake Longwei Co）.The results indicate that total dissolved solids（TDS）in the two lakes are significantly higher than in other gauged lakes on the Qinghai–Tibet Plateau,reaching 20–40 g/L,and that TDS of the tectonic lake（Lake Dogaicoring Qiangco）is significantly higher than that of the barrier lake（Lake Longwei Co）.Na＋and Cl-are the dominant ions in the lake waters as well as in the glacier-fed lake inflows,with chemical compositions mainly affected by halite weathering.In contrast,ion contents of inflowing rivers fed by nearby runoff are lower and concentrations of dominant ions are not significant.Evaporite,silicate,and carbonate weathering has relatively equal effects on these rivers.Due to their limited scope,small streams near the lakes are less affected by carbonate than by silicate weathering.

关键词： Surface water geochemistry Rock weathering Changtang Nature Reserve Qinghai–Tibet Plateau

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Pollination Biology of the Endangered Herbal Medicines Dendrobium chrysotoxum(Orchidaceae)

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Phyton-International Journal of Experimental Botany 2023年第7期92卷 1975-1986页

作者： Kai Luo Yanbing Bai Yan Jiang Guiling Li Min Jia Yongguo He zhijun yao Ziwei Xiao Xiaoqiong Liu Wenjie Liu Shanshan Yin Zesheng Li Medicinal Plant Research Center Dehong Tropical Agriculture Research Institute of YunnanRuili678600China Human Resources Management Office The People’s Hospital of XiangyunXiangyun672100China

Pollination biology studies of the endangered herbal medicines Dendrobium chrysotoxum were conducted in natural pollination conditions using flower observation,pollinator observation and artificial pollination experiments.Populations of D.chrysotoxum with fragrance and nectar were pollinated by Ctenoplectra davidi Valhalla(Hymenoptera:Apidae)species.The floral structure of D.chrysotoxum adapted precisely to its pollinators.Flowers had a low capsule setting(0.17%)under natural conditions.However,compared to open pollination,artificial pollination experiments showed a significant increase in capsule setting,and D.chrysotoxum was cross-compatible and self-compatible,but there was pollinator limitation also.This study will provide important information for the preservation of this endangered species.

关键词： Breeding system Dendrobium chrysotoxum pollination pollination biology

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Surface doping manipulation of the insulating ground states in Ta_(2)Pd_(3)Te_(5) and Ta_(2)Ni_(3)Te_(5)

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Chinese Physics B 2024年第6期33卷 88-93页

作者：江北姚静宇闫大禹郭照芃屈歌星邓修同黄耀波丁洪石友国王志俊钱天 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Tsung-Dao Lee Institute New Cornerstone Science Laboratoryand School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 201210China Hefei National Laboratory Hefei 230088China

Manipulating emergent quantum phenomena is a key issue for understanding the underlying physics and contributing to possible applications.Here we study the evolution of insulating ground states of Ta_(2)Pu_(3)Te_(5) and Ta_(2)Ni_(3)Te_(5) under in-situ surface potassium deposition via angle-resolved photoemission spectroscopy.Our results confirm the excitonic insulator character of Ta_(2)d_(3)Te_(5).Upon surface doping,the size of its global gap decreases obviously.After a deposition time of more than 7 min,the potassium atoms induce a metal-insulator phase transition and make the system recover to a normal state.In contrast,our results show that the isostructural compound Ta_(2)Ni_(3)Te_(5) is a conventional insulator.The size of its global gap decreases upon surface doping,but persists positive throughout the doping process.Our results not only confirm the excitonic origin of the band gap in Ta_(2)Pd_(3)Te_(5),but also offer an effective method for designing functional quantum devices in the future.

关键词： excitonic insulator metal–insulator phase transition surface doping angle-resolved photoemission spectroscopy

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前秦苻氏文学家族的“胡音汉调”

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地域文化研究 2024年第1期40卷 94-100页

作者：霍志军姚凤珠天水师范学院甘肃天水741000

十六国时期,原本居住于陇右地区的氐族苻氏带领部落向自关中、中原地区迁徙。在此过程中,他们对来自西域的佛教文化以及来自,中原地区传统儒道经典、新起玄学思想等均广采博取、为己所用,逐渐成为一个融合多民族文化的文学家族。在民族... 详细信息

十六国时期,原本居住于陇右地区的氐族苻氏带领部落向自关中、中原地区迁徙。在此过程中,他们对来自西域的佛教文化以及来自,中原地区传统儒道经典、新起玄学思想等均广采博取、为己所用,逐渐成为一个融合多民族文化的文学家族。在民族文化融合的背景下,苻氏文学家族的文学水平、特色尽管随历史的推移而有所变化,但汉文化始终占据核心地位。氐族苻氏文学家族的作品体现出游牧文化与中原汉文化相互融合的气质,表现出清雄健爽、质实贞刚的文学风格,显示出各民族文化交融是中国文学繁荣壮大的重要推动力量。

关键词：前秦苻氏文学家族胡音汉调

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四川大学博物馆结构设计重难点分析研究

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建筑结构 2024年第11期54卷 100-106页

作者：张蜀泸姚丽张志军朱思其中国建筑西南设计研究院有限公司成都610042

四川大学博物馆采用钢框架结构体系,并设置屈曲约束支撑改善结构的抗震性能。介绍了四川大学博物馆的结构设计参数及抗震性能目标。针对结构设计中的重难点,开展了屈曲约束支撑的工作机理分析、框架柱计算长度与穿层柱分析、东侧大悬挑... 详细信息

四川大学博物馆采用钢框架结构体系,并设置屈曲约束支撑改善结构的抗震性能。介绍了四川大学博物馆的结构设计参数及抗震性能目标。针对结构设计中的重难点,开展了屈曲约束支撑的工作机理分析、框架柱计算长度与穿层柱分析、东侧大悬挑空间的相关分析。利用反应谱分析及时程分析探究了屈曲约束支撑工作机理,分析结果表明,屈曲约束支撑能够有效改善钢结构产生塑性铰的状况,起到保护主体钢框架的作用。针对东侧大悬挑空间的功能要求,设计采用了屋顶桁架结合钢拉杆吊挂东侧大楼梯的结构形式,通过结构防连续倒塌分析、楼板应力分析、楼盖舒适度分析、关键节点有限元分析等确保该部位结构设计安全合理。对整体结构受力机理和薄弱部位进行了研究,提出了重点部位的设计原则和加强措施。

关键词：四川大学博物馆钢框架结构屈曲约束支撑性能化设计空间悬挑关键节点

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基于射击时机的坦克射击门分析及改进

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火力与指挥控制 2024年第3期49卷 124-129页

作者：张贤椿姚志军王军刘宗凯南京理工大学自动化学院南京210094 白城兵器试验中心吉林白城137001

针对坦克的射击门控制逻辑,分析现有射击门在坦克高速行进条件下在射击时机判断上的不足,提出基于预测机制的射击门改进方法,该射击门在考虑射击时延和炮口切向速度影响的情况下,去除了身管必须满足进入简单射击门的角度约束,可更大限... 详细信息

针对坦克的射击门控制逻辑,分析现有射击门在坦克高速行进条件下在射击时机判断上的不足,提出基于预测机制的射击门改进方法,该射击门在考虑射击时延和炮口切向速度影响的情况下,去除了身管必须满足进入简单射击门的角度约束,可更大限度地把握有效射击时机,数字仿真结果验证了改进射击门的优越性。

关键词：坦克炮身管射击门预测机制射击时机

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蒙华铁路白城隧道马蹄形盾构设计施工关键技术

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现代隧道技术 2024年第2期61卷 254-262页

作者：申志军姚智文郑余朝仇文革艾旭峰西南交通大学土木工程学院成都610031 中铁四局集团有限公司合肥230023

蒙华铁路白城隧道作为世界上首次采用马蹄形土压平衡盾构机施工的大断面山岭黄土隧道,针对其始发接收难、掘进难、姿态控制难、出渣难等工程重难点问题,提出了具体的解决方案:(1)始发段采用C40明洞结构代替常规地铁所使用的盾构始发专... 详细信息

蒙华铁路白城隧道作为世界上首次采用马蹄形土压平衡盾构机施工的大断面山岭黄土隧道,针对其始发接收难、掘进难、姿态控制难、出渣难等工程重难点问题,提出了具体的解决方案:(1)始发段采用C40明洞结构代替常规地铁所使用的盾构始发专用反力架提供反力的技术方案,利用人工钻爆法大管棚端头加固代替常规的端头加固,采用型钢套拱密封代替端墙和帘布橡胶密封,缩短始发时间,节省圬工。(2)接收段在洞口修筑八字形挡墙,替代常规地铁施工中围护结构和洞口段加固作业,设置洞门钢环并密封,保证盾构安全接收。(3)组合式旋转刀盘结合盲区处理技术中的高压水刀喷射装置和盾体切刀较好处理了老黄土地层掘进难题。(4)刀盘翻转纠偏配合打土泵、配重块纠偏以解决姿态控制难题。(5)以3%原液浓度、15%注入率的泡沫和水作为主要改良介质的渣土改良技术和优化后的连续皮带机不间断出渣技术配合改善了出渣难题。

关键词：蒙华铁路白城隧道马蹄形盾构设计施工技术

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Seroprevalence of Toxoplasma gondii infection among patients with hand, foot and mouth disease in Henan, China: a hospital-based study

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Infectious Diseases of Poverty 2015年第1期4卷 460-464页

作者： Shuai Wang Chunwei Lan Luwen Zhang Haizhu Zhang zhijun yao Dong Wang Jingbo Ma Jiarong Deng Shiguo Liu Department of Human Parasitology Xinxiang Medical UniversityXinxiangHenan 453003PR China First People’s Hospital of Pingdingshan PingdingshanHenan 467000PR China

Background:The prevalence of infection with Toxoplasma gondii(T.gondii)in humans has been increasing in China due to the growing number of cats in the country.Hand,foot and mouth disease(HFMD)is a serious public health issue in China and still one of the leading causes of child mortality.However,little is known about the epidemiology of T.gondii infection among HFMD patients.Methods:A case–control study of 281 HFMD patients from the First People’s Hospital of Pingdingshan in Pingdingshan city,Henan province,central China,and 222 controls from Pingdingshan city was conducted.Anti-T.gondii antibodies were serologically detected using the enzyme-linked immunosorbent assay.Results:We found that the overall anti-T.gondii immunoglobulin G(IgG)antibody prevalence among HFMD patients was 12.46%,which was significantly higher than that in clinically healthy children(1.80%).The highest T.gondii seroprevalence was detected in critical cases(22.58%),followed by severe cases(11.50%),and the lowest was detected in mild cases(8.33%).Conclusion:The present study is the first survey of T.gondii seroprevalence among HFMD patients in China;12.46%were defined as seropositive.It is imperative that improved integrated measures are taken to prevent and control T.gondii infection among HFMD patients.

关键词： Toxoplasma gondii Hand Foot and mouth disease Seroprevalence Enzyme-linked immunosorbent assay China

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