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Characteristics of bioaerosols under high-ozone periods,haze episodes,dust storms,and normal days in Xi'an,China

Particuology 2024年第7期90卷 140-148页

作者： Yiming yang Liu yang Xiaoyan Hu Zhenxing Shen Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an710049China Key Lab of Aerosol Chemistry&Physics SKLLQGInstitute of Earth EnvironmentChinese Academy of SciencesXi’an710049China

The characteristics of bioaerosols and their effects on human beings'health have become a major public concern in the recent *** study compared the characteristics of bioaerosols under different types of pollution(high-ozone[HO]episodes,haze episodes,and dust storms[DSs]),with those of bioaerosols on normal days(NDs)in Xi'an,*** concentrations,diurnal variations,and size distribution of bacteria,fungi,and total airborne microbes(TAMs)were *** results showed that the bacterial and fungal concentrations were the highest during DSs and on NDs,reaching 425.2 and 956.9 colony-forming units/m^(3),*** concentration of TAMs was the highest during HO episodes,reaching 10.7×10^(6)cells/m^(3),which was significantly higher than that during the other *** maximum concentrations of bacteria and fungi during HO episodes were observed in the morning,while they appeared separately in the morning and evening during haze *** and TAMs during DSs reached peak concentrations in the morning and evening,which is opposite to the particulate matter(PM)distribution *** NDs,temperature and relative humidity had significant effects on *** size distributions of airborne bacteria exhibited bimodal patterns,whereas unimodal distributions were observed for *** mainly attached in fine particles(<2.1μm)with proportions of 67.4%and 60.5%during haze episodes and DSs,respectively,which means that fungi were easily penetrated into the human respiratory *** evaluation of influence factors revealed that PM_(2.5) and PM10 had negative effects on fungal concentration during DSs,and ozone concentration and temperature were inversely correlated with fungal concentration during HO *** results provide valuable reference data for elucidating the formation and evolution of bioaerosols under different types of pollution.

关键词： Bacteria Fungi Total airborne microbe Different air pollution types Influence factors

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政府多维医疗卫生支出的健康产出效应:基于健康水平和健康差距双重视角

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中国软科学 2024年第8期 83-96页

作者：樊敏杰杨蕊刘源张祎萌河南财经政法大学财政税务学院河南郑州450046

发挥政府投入激励作用、强化政府兜底责任是推进“健康中国”建设的重要一环。基于2012—2020年中国家庭追踪调查(CFPS)面板数据,实证检验政府多维医疗卫生支出的健康促进效应及健康平等效应。研究发现:政府医疗卫生总支出具有显著的健... 详细信息

发挥政府投入激励作用、强化政府兜底责任是推进“健康中国”建设的重要一环。基于2012—2020年中国家庭追踪调查(CFPS)面板数据,实证检验政府多维医疗卫生支出的健康促进效应及健康平等效应。研究发现:政府医疗卫生总支出具有显著的健康提升效应,且对生理健康的影响效应超过了心理健康;各维度政府医疗卫生支出通过不同渠道缩小了居民健康差距;政府医疗卫生支出在户籍、地区、年龄、收入方面存在异质性;机制分析结果表明,政府医疗卫生支出对于居民健康水平及健康差距的影响主要是通过疾病预防、疾病负担、医疗服务利用和医疗服务供给等渠道实现的。研究结论为进一步完善医疗卫生投入模式、推进“健康中国”战略提供了政策依据。

关键词：政府医疗卫生支出健康水平健康差距

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Input-to-State Stability for Impulsive Switched Singular Systems with Mismatched Disturbances

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Journal of Systems Science & Complexity 2024年第3期37卷 924-946页

作者： yang Anqing MA Shuping School of Information Engineering Shandong Management UniversityJinan 250357China School of Mathematics Shandong UniversityJinan 250100China

This work investigates the input-to-state stability(ISS)problem for impulsive switched singular systems(ISSSs)with mismatched *** this paper,‘disturbance’is a general concept that includes model uncertainty,unknown system dynamic,external disturbance,*** modified uncertainty and disturbance estimator(UDE)-based control method is presented for singular systems and ISSSs,a virtual control is introduced to offset the effects of mismatched *** the basis of a discontinuous multiple Lyapunov functional and admissible edge-dependent average dwell time(AED-ADT)method,several sufficient conditions in terms of linear matrix inequalities(LMIs)are obtained to ensure that the closed-loop systems are regular,impulse-free and ***,two examples are given to demonstrate the effectiveness of the proposed results.

关键词： Impulsive switched singular systems input-to-state stability UDE-based control

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Development in oxide metallurgy for improving the weldability of high -strength low-alloy steel-Combined deoxidizers and microalloying elements

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1263-1284页

作者： Tingting Li Jian yang State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

The mechanisms of oxide metallurgy include inducing the formation of intragranular acicular ferrite(IAF)using micron-sized inclusions and restricting the growth of prior austenite grains(PAGs)by nanosized particles during *** chaotically oriented IAF and refined PAGs inhibit crack initiation and propagation in the steel,resulting in high impact *** work summarizes the com-bined effect of deoxidizers and alloying elements,with the aim to provide a new perspective for the research and practice related to im-proving the impact toughness of the heat affected zone(HAZ)during the high heat input *** complex deoxidation with other strong deoxidants,such as Mg,Ca,Zr,and rare earth metals(REMs),can improve the toughness of the heat-affected zone(HAZ)by re-fining PAGs or increasing IAF ***,it is difficult to identify the specific phase responsible for IAF nucleation because ef-fective inclusions formed by complex deoxidation are usually *** alloying elements,such as C,Si,Al,Nb,or Cr,con-tents can impair HAZ toughness.A high C content typically increases the number of coarse carbides and decreases the potency of IAF ***,Cr,or Al addition leads to the formation of undesirable *** reduces the high-temperature stability of the ***,V,and B can enhance HAZ ***-containing precipitates present good thermal *** or V(C,N)is ef-fective in promoting IAF nucleation due to its good coherent crystallographic relationship with *** formation of the B-depleted zone around the inclusion promotes IAF *** interactions between alloying elements are complex,and the effect of adding dif-ferent alloying elements remains to be *** the future,the interactions between various alloying elements and their effects on ox-ide metallurgy,as well as the calculation of the nucleation effects of effective inclusions using first principles calculations will become the focus of

关键词： oxide metallurgy technology heat affected zone high-strength low-alloy steel intragranular acicular ferrite microalloying element

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上海长宁来福士广场大型复杂商业建筑结构设计

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建筑结构 2023年第S1期53卷 181-185页

作者：杨毅萌金伟吴婧瞿革杜洋刘佳琦中船第九研究院工程有限公司上海200090 上实城开(上海)城市建设管理有限公司上海200030

大型商业建筑为满足建筑功能的要求,柱网布置灵活,竖向传力构件不连续。本工程设计,针对于上抬下挂的悬挑转换桁架进行了不同受力状态的计算分析与比较,并通过有限元分析及节点试验对设计的合理性、可靠性进行验证,以便采取有针对性措施... 详细信息

大型商业建筑为满足建筑功能的要求,柱网布置灵活,竖向传力构件不连续。本工程设计,针对于上抬下挂的悬挑转换桁架进行了不同受力状态的计算分析与比较,并通过有限元分析及节点试验对设计的合理性、可靠性进行验证,以便采取有针对性措施,确保工程安全、可靠。

关键词：上抬下挂转换桁架正序逆序施工模拟分析舒适度复杂节点设计

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Sparse Reconstructive Evidential Clustering for Multi-View Data

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 459-473页

作者： Chaoyu Gong yang You School of Computing National University of SingaporeSingapore

Although many multi-view clustering(MVC) algorithms with acceptable performances have been presented, to the best of our knowledge, nearly all of them need to be fed with the correct number of clusters. In addition, these existing algorithms create only the hard and fuzzy partitions for multi-view objects,which are often located in highly-overlapping areas of multi-view feature space. The adoption of hard and fuzzy partition ignores the ambiguity and uncertainty in the assignment of objects, likely leading to performance degradation. To address these issues, we propose a novel sparse reconstructive multi-view evidential clustering algorithm(SRMVEC). Based on a sparse reconstructive procedure, SRMVEC learns a shared affinity matrix across views, and maps multi-view objects to a 2-dimensional humanreadable chart by calculating 2 newly defined mathematical metrics for each object. From this chart, users can detect the number of clusters and select several objects existing in the dataset as cluster centers. Then, SRMVEC derives a credal partition under the framework of evidence theory, improving the fault tolerance of clustering. Ablation studies show the benefits of adopting the sparse reconstructive procedure and evidence theory. Besides,SRMVEC delivers effectiveness on benchmark datasets by outperforming some state-of-the-art methods.

关键词： Evidence theory multi-view clustering(MVC) optimization sparse reconstruction

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地表节肢动物多样性对煤矸石山不同植被恢复方式的响应及生物指示作用

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生态环境学报 2022年第10期31卷 2079-2088页

作者：辛未冬杜一丹刘华煜杨轶萌赵浩志杨丹山西师范大学地理科学学院山西太原030031

地表节肢动物是土壤生态系统的重要组成部分,对土壤环境的变化十分敏感。煤矸石山生态退化形势严峻,恢复植被是修复退化煤矸石山生态系统的主要措施,不仅影响土壤理化性质,还影响与土壤有密切联系的地表节肢动物多样性。为探究煤矸石山... 详细信息

地表节肢动物是土壤生态系统的重要组成部分,对土壤环境的变化十分敏感。煤矸石山生态退化形势严峻,恢复植被是修复退化煤矸石山生态系统的主要措施,不仅影响土壤理化性质,还影响与土壤有密切联系的地表节肢动物多样性。为探究煤矸石山不同植被恢复方式与地表节肢动物群落多样性之间的关系,于2019年10月选取霍州煤矸石山恢复区的天然恢复植被(草地)、人工恢复植被(石榴地和山楂地)和未受煤矸石影响的玉米地(对照)为研究对象,分析地表节肢动物多样性对煤矸石山不同植被恢复方式的响应及生物指示作用。研究发现,(1)4个样地地表节肢动物活动密度和群落多样性指数均有显著差异。活动密度、Simpson优势度指数和Shannon-wiener多样性指数均表现为石榴地与其他样地存在显著差异;Margalef丰富度指数表现为玉米地显著高于其他样地;Pielou均匀度指数表现为草地最高,石榴地最低。(2)CCA排序结果表明,土壤速效磷和含水量是影响地表节肢动物分布的主要土壤环境因子,且不同地表节肢动物类群对土壤环境因子的响应不同,其中疣跳科(Neanuridae)的活动密度与土壤速效磷和含水量显著正相关。(3)地表节肢动物对不同恢复样地有较强指示作用,其中卷壳虫科(Armadillidae)可指示山楂地,蓟马科(Thripidae)等可指示石榴地,缘腹细蜂科(Scelionidae)等可指示对照玉米地,草地无指示种。研究表明,天然恢复不利于提高地表节肢动物活动密度和类群数,但可以维持较高的Shannon多样性指数;人工恢复虽然有较高的地表节肢动物活动密度和类群数,但Shannon多样性指数和Pielou均匀度指数较低;两种恢复方式在提升地表节肢动物类群数目方面与对照玉米地相比仍有差异,未来还需参考各恢复植被的功能特征,制定因地制宜的恢复策略。

关键词：地表节肢动物多样性煤矸石山指示种土壤环境植被

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High-pressure minerals and new lunar mineral changesite-(Y) in Chang’e-5 regolith

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Matter and Radiation at Extremes 2024年第2期9卷 90-97页

作者： Jing yang Wei Du Center for Lunar and Planetary Sciences Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences(CAS)Guiyang 550081China CAS Center for Excellence in Comparative Planetology Hefei 230026China

Forty-five years after the Apollo and Luna missions, China’s Chang’e-5 (CE-5) mission collected ∼1.73 kg of new lunar materials from one ofthe youngest basalt units on the Moon. The CE-5 lunar samples provide opportunities to address some key scientific questions related to theMoon, including the discovery of high-pressure silica polymorphs (seifertite and stishovite) and a new lunar mineral, changesite-(Y). Seifertitewas found to be coexist with stishovite in a silica fragment from CE-5 lunar regolith. This is the first confirmed seifertite in returned lunarsamples. Seifertite has two space group symmetries (Pnc2 and Pbcn) and formed from an α-cristobalite-like phase during “cold” compressionduring a shock event. The aftershock heating process changes some seifertite to stishovite. Thus, this silica fragment records different stagesof an impact process, and the peak shock pressure is estimated to be ∼11 to 40 GPa, which is much lower than the pressure condition forcoexistence of seifertite and stishovite on the phase diagram. Changesite-(Y), with ideal formula (Ca_(8)Y)◻Fe^(2+)(PO_(4))_(7) (where ◻ denotes avacancy) is the first new lunar mineral to be discovered in CE-5 regolith samples. This newly identified phosphate mineral is in the form ofcolumnar crystals and was found in CE-5 basalt fragments. It contains high concentrations of Y and rare earth elements (REE), reaching upto ∼14 wt. % (Y,REE)2O3. The occurrence of changesite-(Y) marks the late-stage fractional crystallization processes of CE-5 basalts combinedwith silicate liquid immiscibility. These new findings demonstrate the significance of studies on high-pressure minerals in lunar materials andthe special nature of lunar magmatic evolution.

关键词： evolution minerals basalt

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An improved initial rotor position estimation method using high-frequency pulsating voltage injection for PMSM

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Defence Technology（防务技术） 2024年第3期33卷 19-29页

作者： yang Jiang Ming Cheng School of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous ***,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter *** addition,a new magnetic polarity detection method is proposed,which is robust to current measurement ***,experiments verify the effectiveness of the method.

关键词： Initial position detection Signal demodulation algorithm Magnetic polarity detection Filter elimination

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Large language model and domain-specific model collaboration for smart education

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Frontiers of Information Technology & Electronic Engineering 2024年第3期25卷 333-341页

作者： Yawei LUO Yi yang School of Software Technology Zhejiang UniversityNingbo 315048China College of Computer Science and Technology Zhejiang UniversityHangzhou 310027China

In this paper,we introduce the large language model and domain-specific model collaboration(LDMC)framework designed to enhance smart *** LDMC framework leverages the comprehensive and versatile knowledge of large domain-general models,combines it with the specialized and disciplinary knowledge from small domainspecific models(DSMs),and incorporates pedagogy knowledge from learning theory *** integration yields multiple knowledge representations,fostering personalized and adaptive educational *** explore various applications of the LDMC framework in the context of smart education.

关键词： smart language knowledge

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