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Spatiotemporal Characteristics of Rainfall over Different Terrain Features in the Middle Reaches of the Yangtze River Basin during the Warm Seasons of 2016–20

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Advances in Atmospheric Sciences 2024年第5期41卷 915-936页

作者： Qian WEI Jianhua SUN Shenming FU yuanchun zhang Xiaofang WANG Key Laboratory of Cloud-Precipitation Physics and Severe Storms(LACS) Institute of Atmospheric PhysicsChinese Academy of Sciences(IAP/CAS)Beijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100029China International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Hubei Key Laboratory for Heavy Rian Monitoring and Warning Research Institute of Heavy RainChina Meteorological Administration(CMA)Wuhan 430205China

Based on hourly rain gauge data during May–September of 2016–20,we analyze the spatiotemporal distributions of total rainfall(TR)and short-duration heavy rainfall(SDHR;hourly rainfall≥20 mm)and their diurnal variations over the middle reaches of the Yangtze River *** all three types of terrain(i.e.,mountain,foothill,and plain),the amount of TR and SDHR both maximize in June/July,and the contribution of SDHR to TR(CST)peaks in August(amount:23%;frequency:1.74%).Foothill rainfall is characterized by a high TR amount and a high CST(in amount);mountain rainfall is characterized by a high TR frequency but a small CST(in amount);and plain rainfall shows a low TR amount and frequency,but a high CST(in amount).Overall,stations with high TR(amount and frequency)are mainly located over the mountains and in the foothills,while those with high SDHR(amount and frequency)are mainly concentrated in the foothills and plains close to mountainous *** all three types of terrain,the diurnal variations of both TR and SDHR exhibit a double peak(weak early morning and strong late afternoon)and a phase shift from the early-morning peak to the late-afternoon peak from May to *** the late-afternoon peak,the amount of TR and SDHR in the foothills is larger than over the mountains and *** TR intensity in the foothills increases significantly from midnight to afternoon,suggesting that thermal instability may play an important role in this process.

关键词： short duration heavy rainfall diurnal variation foothill rainfall

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Multiscale analysis of fine slag from pulverized coal gasification in entrained-flow bed

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International Journal of Coal Science & Technology 2024年第1期11卷 119-132页

作者： Lirui Mao Mingdong Zheng Baoliang Xia Facun Jiao Tao Liu yuanchun zhang Shengtao Gao Hanxu Li School of Chemical Engineering Anhui University of Science and TechnologyHuainan232001China School of Earth and Environment Anhui University of Science and TechnologyHuainan232001China Insititute of Energy Hefei Comprehensive National Science CenterHefei230031China

Fine slag(FS)is an unavoidable by-product of coal ***,which is a simple heap of solid waste left in the open air,easily causes environmental pollution and has a low resource utilization rate,thereby restricting the development of energy-saving coal gasification *** multiscale analysis of FS performed in this study indicates typical grain size distribution,composition,crystalline structure,and chemical bonding *** FS primarily contained inorganic and carbon components(dry bases)and exhibited a"three-peak distribution"of the grain size and regular spheroidal as well as irregular *** irregular particles were mainly adsorbed onto the structure and had a dense distribution and multiple pores and *** carbon constituents were primarily amorphous in structure,with a certain degree of order and active sites.C 1s XPS spectrum indicated the presence of C–C and C–H bonds and numerous aromatic *** inorganic components,constituting 90%of the total sample,were primarily silicon,aluminum,iron,and *** inorganic components contained Si–O-Si,Si–O–Al,Si–O,SO_(4)^(2−),and Fe–O *** 2p XPS spectrum could be deconvoluted into Fe 2p_(1/2) and Fe 2p_(3/2) peaks and satellite peaks,while Fe existed mainly in the form of Fe(III).The findings of this study will be beneficial in resource utilization and formation mechanism of fine slag in future.

关键词： Coal gasification Fine slag Multiscale analysis Carbon components Inorganic components

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Initiation, organizational modes and environmental conditions of severe convective wind events during the warm season over North China

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Science China Earth Sciences 2024年第9期67卷 2876-2894页

作者： Yue HUANG Jianhua SUN yuanchun zhang Ruoyun MA Xinlin YANG Fuyou TIAN Key Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS) Institute of Atmospheric PhysicsChinese Academy of Sciences University of the Chinese Academy of Sciences Earth System Modeling and Prediction Center China Meteorological Administration College of Aviation Meteorology Civil Aviation Flight University of China National Meteorological Center China Meteorological Administration

Based on the significant weather report, CG lightning, composite radar reflectivity, and ERA5 reanalysis data, we first studied the spatiotemporal distribution characteristics of four types(only severe convective wind(SCW); SCW and hail;SCWand short-duration heavy rainfall(SDHR); and SCW, hail, and SDHR) of convective weather events related to SCW during the warm season(May to September) from 2011 to 2018 in North China. Second, severe convective cases producing SCW were selected to statistically analyze the initiation, decay, lifetime, and organizational characteristics of convective systems. Finally,using ERA5 reanalysis data and conventional surface observation data, preconvective soundings were constructed to explore the differences in environmental conditions for initiating convective systems between SCW and non-SCW. The results indicate that mixed-type of SCW and SDHR events occur more frequently over plains, while other types of convective weather occur more frequently over mountains. The frequency peak of SCW occurs in June, while mixed convective weather peaks in July. The initiation time of convective systems is concentrated between 1000 and 1300 BST, with a peak at 1200 BST. Over mountains, the daily peaks of ordinary and significant SCW generally occur at 1700–1800 BST and 1600–1700 BST, respectively, while over plains, the peak of ordinary SCW typically lags behind that of mountains by 1–2 hours. Additionally, SCW systems are mainly initiated over mountains, with most lifetimes lasting 7–13 hours. Nonlinear convective systems produce the most SCW events,followed by trailing-stratiform convective systems. The convective available potential energy(CAPE), downdraft convective available potential energy, and the temperature difference between 850 and 500 hPa can all distinguish between SCW systems and non-SCW systems occurring over plains. Compared to non-SCW convective systems, SCW convective systems over mountains are more likely to occur in environments

关键词： Severe convective wind Convective systems Initiation Organizational modes Environmental conditions

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煤气化细灰理化性质及其电磁波吸收性能

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复合材料学报 2024年第5期41卷 2559-2574页

作者：高圣涛张元春安徽理工大学化学工程学院煤炭安全精准开采国家地方联合工程研究中心淮南232001

煤气化技术作为煤炭清洁利用的主要途径之一在中国得到快速发展,细灰是煤气化过程中不可避免产生的新型固体废物。国家对绿色、清洁生产和发展循环经济逐步推行,细灰的资源化利用和无害化处理技术成为实现煤气化技术环保效益和经济效益... 详细信息

煤气化技术作为煤炭清洁利用的主要途径之一在中国得到快速发展,细灰是煤气化过程中不可避免产生的新型固体废物。国家对绿色、清洁生产和发展循环经济逐步推行,细灰的资源化利用和无害化处理技术成为实现煤气化技术环保效益和经济效益兼得的关键所在。以煤气化细灰为研究对象,对细灰进行干燥、球磨预处理得到中位径为2μm的样品,利用XRD、Raman、SEM、TEM和XPS等分析测试技术对其晶体结构、微观形貌、组成、分子构造和元素化学态进行表征,并测试了细灰电磁波吸收性能。结果表明:细灰中含有部分石墨化的碳和单质铁,具有较完整的孔隙结构,这为其作为电磁波吸收材料提供了可能性;细灰/石蜡吸波剂在较薄厚度下同时表现出较宽的有效吸收带宽和一定强度的反射损耗,当匹配厚度为1.7 mm时,该吸波剂在15.6 GHz时达到最小反射损耗值,为-17.6 dB,此时有效吸收带宽(反射损耗值≤-10 dB)达到4.2 GHz。此外,雷达散射截面模拟结果表明:该吸波涂层能有效降低完美导体基板的电磁波散射。

关键词：煤气化细灰电磁波吸收煤炭清洁利用理化性质固体废物

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FCFF模型评估高新技术企业价值的适用性研究——以奇虎360为例

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江苏科技信息 2024年第2期41卷 12-15页

作者：张园春宝鸡文理学院经济管理学院陕西宝鸡721013

在知识经济的时代背景下,高新技术企业发展劲头强盛,呈现迅速增长趋势。高新技术企业研发与创新投入大,研发投入收益滞后,传统的企业价值评估方法无法对其进行有效评估。基于此,文章以典型高新技术企业奇虎360公司为例,应用FCFF模型评... 详细信息

在知识经济的时代背景下,高新技术企业发展劲头强盛,呈现迅速增长趋势。高新技术企业研发与创新投入大,研发投入收益滞后,传统的企业价值评估方法无法对其进行有效评估。基于此,文章以典型高新技术企业奇虎360公司为例,应用FCFF模型评估企业价值,并选取EVA模型进行评估结果的对比敏感性分析,验证FCFF模型评估高新技术企业的高适用性,以期为我国高新技术企业价值评估提供借鉴和参考。

关键词： FCFF模型高新技术企业企业价值评估敏感性分析

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煤电化基地大宗固废“三化”协同利用基础与技术

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煤炭科学技术 2024年第4期52卷 69-82页

作者：杨科何淑欣何祥初茉周伟袁宁陈登红龚鹏张元春安徽理工大学矿业工程学院安徽淮南232001 合肥综合性国家科学中心能源研究院(安徽省能源实验室) 安徽合肥230031 中国矿业大学(北京)化学与环境工程学院北京100083 安徽理工大学材料科学与工程学院安徽淮南232001 中国矿业大学力学与土木工程学院江苏徐州221116 安徽理工大学化工与爆破学院安徽淮南232001

我国14个大型煤炭基地及89个大宗固体废弃物综合利用示范基地建设,标志着矿区大宗固废利用已被纳入全国战略发展布局。长期以来煤炭资源高强度的开发与利用,造成矿区浅埋煤层资源临近枯竭,煤电化基地大规模固废堆积及地表沉陷,已成为制... 详细信息

我国14个大型煤炭基地及89个大宗固体废弃物综合利用示范基地建设,标志着矿区大宗固废利用已被纳入全国战略发展布局。长期以来煤炭资源高强度的开发与利用,造成矿区浅埋煤层资源临近枯竭,煤电化基地大规模固废堆积及地表沉陷,已成为制约矿区绿色低碳、高质量发展的难题。大宗煤基固废协同利用与绿色充填是解放“三下一上”压煤,延长矿井服务年限,实现固废无害化、资源化、规模化“三化”利用的有效途径。基于产煤大省山西省、“华东能源粮仓”安徽两淮基地及宁东能源化工基地的煤基固废种类和产量,详细阐述了以煤矸石、粉煤灰、炉底渣、气化渣和脱硫石膏等为主要材料的煤基固废通过重金属吸附解吸和络合钝化技术实现无害化处置,列举煤基固废分类应用于低热值煤基固废发电、制备建筑材料如水泥、砖瓦等资源化利用途径,对比分析煤基固废采煤沉陷区复垦回填及井下充填规模化利用途径,突出煤基固废井下充填的优越性。基于煤电化基地深部煤炭资源,提出绿色充填开采理论与关键技术,包括深部煤矸石源头减量与采选充协同技术、充填材料高效制备与深部井下输送技术及煤基固废充填材料深部多场耦合机理,探究多源煤基固废从源头、过程到终端的深部充填开采全过程的技术原理与方法,以解决矿区深部井下充填的技术难题。根据宁东基地任家庄煤矿、山西省霍尔辛赫煤矿及淮北矿区地质条件和充填目的,分别提出超前钻孔注充低位充填方案、关键层非典型特征条件下多离层梯级注浆方案和煤基固废协同利用关键技术,综合矿山固废处置与利用、深部煤炭资源开发利用、地表沉陷控制、生态环境保护等优势,形成煤电化基地大宗固废协同利用与绿色开采模式,为煤炭开采高质量化和环境低损伤化提供参考。

关键词：煤电化基地煤基固废协同利用深部开采源头减量采选充一体化

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N-doped residual carbon from coal gasification fine slag decorated with Fe_(3)O_(4)nanoparticles for electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第9期104卷 98-108页

作者： Jun He Shengtao Gao yuanchun zhang Xingzhao zhang Hanxu Li School of Chemical Engineering Anhui University of Science and TechnologyHuainan 232001China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

The electromagnetic wave absorption(EMWA)performance of materials is affected by their dielectric and magnetic ***,ferroferric oxide@N-doped residual carbon(Fe_(3)O_(4)@NRC)composites were successfully fabricated by decorating NRC with Fe_(3)O_(4)nanoparticles via a facile chemical co-precipitation *** RC was obtained through acid treatment to remove the inorganic minerals in coal gasification fine *** structure,composition,thermal stability,morphology,and related EM parameters of the as-fabricated Fe_(3)O_(4)@NRC composites were thoroughly tested via analytical ***,both the Fe_(3)O_(4)@NRC-2 and Fe_(3)O_(4)@NRC-3 composites exhibited superior EMWA *** 40%mass was added,the value of minimal reflection loss(RL_(min))for Fe_(3)O_(4)@NRC-2 was-37.4 dB,and the effective absorption bandwidth(EAB,RL≤-10 dB)reached 4.16 GHz(13.84-18.00 GHz)at a thickness of 1.5 ***,the value of impedance matching was 1.00 as the RL_(min)was *** results demonstrated that the EMWA performance of the composites could be adjusted by controlling the content of Fe_(3)O_(4)*** magnetic/carbon composites exhibited superior EMWA performance,thus promoting the resource utilization of residual carbon in coal gasification fine slag from coal gasification.

关键词： Residual carbon Fe_(3)O_(4) Nitrogen-doped Electromagnetic wave absorption Impedance matching

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翻转课堂在中青年2型糖尿病胰岛素宣教中的效果探究

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中国医药指南 2024年第20期22卷 116-118页

作者：张园春王文珺上海市普陀区中心医院内分泌科上海200062

目的探讨翻转课堂对中青年2型糖尿病患者胰岛素注射教学效果和血糖达标的影响。方法2022年1月至2023年1月上海市普陀区中心医院收治的128例首次接受预混胰岛素治疗的中青年2型糖尿病患者,按照随机抽签法分为对照组和观察组,每组64例;对... 详细信息

目的探讨翻转课堂对中青年2型糖尿病患者胰岛素注射教学效果和血糖达标的影响。方法2022年1月至2023年1月上海市普陀区中心医院收治的128例首次接受预混胰岛素治疗的中青年2型糖尿病患者,按照随机抽签法分为对照组和观察组,每组64例;对照组接受传统宣教、观察组采用翻转课堂宣教。宣教结束进行胰岛素注射操作评分、满意度调查,3月后问卷评估两组学习胰岛素注射规范性和血糖达标情况。结果宣教结束后,观察组与对照组胰岛素注射测试总分、宣教满意度高于对照组;90%护士认为翻转课堂宣教方式在培训阶段花费的时间更短。3个月后观察组胰岛素注射规范性评估和糖化血红蛋白达标率高于对照组。结论翻转课堂应用在胰岛素注射宣教中能增加中青年患者主动学习、满足个体化学习需求,提高患者操作规范性,节约专科护士宣教时间且有助于血糖达标,具有一定后续效应。

关键词：翻转课堂糖尿病胰岛素自我注射

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Initiation and Evolution of Long-Lived Eastward-Propagating Mesoscale Convective Systems over the Second-Step Terrain along Yangtze-Huaihe River Valley

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Advances in Atmospheric Sciences 2022年第5期39卷 763-781页

作者： yuanchun zhang Jianhua SUN Ruyi YANG Ruoyun MA Key Laboratory of Cloud-Precipitation Physics and Severe Storms(LACS) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China University of the Chinese Academy of Sciences Beijing 100049China Public Meteorological Service Center China Meteorological AdministrationBeijing 100044China

Based on the previous statistical analysis of mesoscale convective systems(MCSs)over the second-step terrain along Yangtze-Huaihe River Valley,eight representative long-lived eastward-propagating MCSs are selected for model-based sensitivity testing to investigate the initiation and evolution of these types of MCSs as well as their impact on downstream *** subject each MCS to a semi-idealized(CNTL)simulation and a sensitivity(NOLH)simulation that neglects condensational heating in the formation *** CNTL experiment reveals convection forms in the region downstream of a shortwave trough typified by persistent southwesterly winds in the low-to *** merging with other convective systems,moist convection develops into an MCS,which propagates eastward under the influence of mid-tropospheric westerlies,and moves out of the second-step *** MCS then merges with pre-existing local convection over the plains;the merged convection reinforces the cyclonic wind perturbation into a mesoscale vortex at 850 *** this vortex moves eastward to regions with local vortex at 850 hPa,another vortex at 925 hPa is also ***,the vortices at 850 and 925 hPa merge together and develop into a mesoscale convective vortex(MCV).In contrast,MCSs fail to form and move eastward in the NOLH *** the absence of eastward-propagating MCSs,moist convection and mesoscale vortices still appear in the plains,but the vortex strength and precipitation intensity are significantly *** is suggested the eastward-propagating MCSs over the second-step terrain significantly impact the development and enhancement of moist convection and vortices in the downstream areas.

关键词： mesoscale convective systems second-step terrain mesoscale convective vortex numerical sensitivity simulation

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近十年我国涡旋系统的研究进展

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大气科学 2024年第1期48卷 228-260页

作者：孙建华周玉淑傅慎明杨帅张元春汪汇洁黄玥中国科学院大气物理研究所云降水物理与强风暴重点实验室北京100029 中国科学院大气物理研究所国际气候与环境科学中心北京100029 中国科学院大学北京100049

近年我国暴雨和强对流等中小尺度灾害性天气频发,涡旋是产生这些灾害天气的重要天气系统之一。为了不断提高对我国涡旋及其产生的暴雨和强对流天气发生发展机理的认识和预报准确率,本文对容易引发长江流域沿线灾害天气的三类涡旋(高原... 详细信息

近年我国暴雨和强对流等中小尺度灾害性天气频发,涡旋是产生这些灾害天气的重要天气系统之一。为了不断提高对我国涡旋及其产生的暴雨和强对流天气发生发展机理的认识和预报准确率,本文对容易引发长江流域沿线灾害天气的三类涡旋(高原低涡、西南低涡和大别山涡)及对北方地区暴雨、强对流天气有重要影响的东北冷涡、中亚低涡的主要研究成果进行了梳理。主要回顾了近十年这些涡旋的识别方法、时空分布统计特征、三维结构以及产生的暴雨、强对流天气机理。最后,对与涡旋系统以及相关天气的研究与预报中的问题、未来发展方向进行了简要讨论和展望。

关键词：暴雨高原低涡西南低涡大别山涡东北冷涡中亚低涡

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