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Nano Research 2024年第3期17卷 1225-1231页

作者： zichun wang Dan wang Ang Li Lizhuo wang Xiaodong Han Yijiao Jiang Jianfeng Chen Jun Huang Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic–Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029China Laboratory for Catalysis Engineering School of Chemical and Biomolecular EngineeringThe University of SydneyNew South Wales 2006Australia Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024China Department of Engineering Macquarie UniversitySydneyNew South Wales 2109Australia

Metal nanowires show promise in a broad range of applications and can be fabricated via a number of methods,such as vapor–liquid–solid process and template-based ***,the synthesis of Al nanowires(NWs)is still challenging from the stable alumina *** this work,the Ni-catalyzed fabrication of Al NWs has been realized using various Al_(2)O_(3) *** growth dynamics of Al NWs on Ni/Al_(2)O_(3) was studied using in situ transmission electron microscopy(TEM).The effect of alumina structures,compositions,and growth temperature were *** growth of Al NWs correlates with the Na addition to the alumina *** no eutectic mixture of nickel aluminide was formed,a mechanism of Ni-catalyzed reduction of Al_(2)O_(3) for Al NWs growth has been proposed instead of the vapor–liquid–solid *** key insights reported here are not restricted to Ni-catalyzed Al NWs growth but can be extended to understanding the dynamic change and catalytic performance of Ni/Al_(2)O_(3) under working conditions.

关键词： in situ transmission electron microscopy(TEM) Al nanowires alumina reduction nanowire growth

Drivers of spatial structure in thinned forests

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Forest Ecosystems 2024年第2期11卷 202-213页

作者： zichun wang Yaoxiang Li Guangyu wang Zheyu Zhang Ya Chen Xiaoli Liu Rundong Peng College of Mechanical and Electrical Engineering Northeast Forestry UniversityHarbin150040China Department of Forest Resources Management University of British ColumbiaVancouverCanada

Background:As is widely known,an increasing number of forest areas were managed to preserve and enhance the health of forest ***,previous research on forest management has often overlooked the importance of ***:Our objectives were to define the direction of structure-based forest ***,we investigated the relationships between forest structure and the regeneration,growth,and mortality of trees under different thinning ***,the drivers of forest structural change were ***:On the basis of 92 sites selected from northeastern China,with different recovery time (from 1 to 15years) and different thinning intensities (0–59.9%) since the last *** component analysis (PCA)identified relationships among factors determining forest spatial *** structural equation model (SEM)was used to analyze the driving factors behind the changes in forest spatial structure after ***:Light thinning (0–20%trees removed) promoted forest regeneration,and heavy thinning (over 35% of trees removed) facilitated forest ***,only moderate thinning (20%–35%trees removed) created a reasonable spatial *** dead trees were clustered,and they were hardly affected by thinning ***,thinning intensity,recovery time,and altitude indirectly improve the spatial structure of the forest by influencing diameter at breast height (DBH) and canopy ***:Creating larger DBH and canopy area through thinning will promote the formation of complex forest structures,which cultivates healthy and stable forests.

关键词： Thinning Natural secondary forest Spatial structure Dynamic changes Growth factors Structural equation modeling

福州市道路灰尘中多环芳烃粒径分布、生物可利用度及其毒性当量

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环境化学 2024年第2期43卷 515-523页

作者：马晓丽何雨恒张辉王子淳魏然倪进治福建师范大学地理科学学院、碳中和未来技术学院福州350108 福建师范大学福建省湿润亚热带生态地理过程教育部重点实验室福州350108

以福州道路灰尘为研究对象,研究了不同粒径灰尘(>250μm、250—53μm和250μm,0.597 mg·kg^(-1);250—53μm,1.235 mg·kg^(-1);5环(21.5%±0.4%)>3环(13.3%±0.9%)>6环(4.8%±0.2%)>2环(2.0%±0.3%);(2)不同粒径灰尘中有效态PAHs总量随粒径减小而增加,但>250μm粒径灰尘中PAHs的生物可利用度显著高于250—53μm和<53μm粒径灰尘(P<0.05).总体上,低环(2环、3环和4环)PAHs生物可利用度要大于高环(5环和6环)PAHs;(3)不同粒径灰尘中有效态PAHs的总TEQBaP值随粒径减小而增大,且不同粒径灰尘中4环和5环PAHs的TEQBaP值都显著高于其他环数PAHs(P<0.05).由于不同粒径灰尘中4环PAHs含量都最高,且其具有较高的生物可利用度和TEQBaP值,因而在人体内潜在毒性风险最高.

关键词：多环芳烃组成粒径体外消化模型生物可利用度毒性当量

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重组结核杆菌融合蛋白在肺结核密切接触者中筛查结核分枝杆菌感染效果分析

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中国防痨杂志 2024年第8期46卷 897-902页

作者：徐春华朱士玉胡屹易可华宋灿磊王紫纯邬勇王青杨芊茹沈鑫上海市奉贤区疾病预防控制中心性结防科上海201499 上海市金山区疾病预防控制中心性结科上海201599 复旦大学公共卫生学院流行病学教研室上海200032 上海市奉贤区疾病预防控制中心上海201499 上海市金山区疾病预防控制中心上海201599 上海市奉贤区海湾镇社区卫生服务中心预防保健科上海201419 复旦大学生命科学学院上海200032 上海市疾病预防控制中心上海200336

目的:探讨重组结核杆菌融合蛋白(recombinant mycobacterium tuberculosis fusion protein,EC)皮肤试验在筛查肺结核患者密切接触者结核分枝杆菌感染中的实用性和有效性,为进一步优化结核感染检测提供技术建议,了解密切接触者结核分枝... 详细信息

目的:探讨重组结核杆菌融合蛋白(recombinant mycobacterium tuberculosis fusion protein,EC)皮肤试验在筛查肺结核患者密切接触者结核分枝杆菌感染中的实用性和有效性,为进一步优化结核感染检测提供技术建议,了解密切接触者结核分枝杆菌潜伏感染(LTBI)现状。方法:2023年10月23日至11月14日在上海市奉贤区和金山区共选取140名肺结核密切接触者作为研究对象,对每名研究对象同时采用γ-干扰素释放试验(IGRA)和EC皮肤试验进行结核感染检测,采用Kappa值检验两种方法结果一致性,采用χ^(2)检验比较两组检测方法之间的差异,以P<0.05为差异有统计学意义。结果:140名研究对象,包括男性55例,女性85例;IGRA阳性率为15.00%(21/140),EC皮肤试验阳性率为14.29%(20/140),两种试验方法一致性检验Kappa值为0.857,差异无统计学意义(χ^(2)=0.029,P=0.866),两种检测方法检测结果为高度一致性;以IGRA作为结核感染的参考标准,EC皮肤试验的敏感度为85.71%(18/21)、特异度为98.32%(117/119)、阳性预测值为90.00%(18/20)、阴性预测值为97.50%(117/120);男性EC阳性率(32.73%,18/55)明显高于女性(2.35%,2/85),差异有统计学意义(χ^(2)=17.983,P<0.001)。结论:EC皮肤试验具有较强的特异性,可用于肺结核密切接触者结核分枝杆菌感染筛查,但受限于使用年龄和接种禁忌证,可采用IGRA对无法进行EC皮肤试验者进行补充检测。

关键词：分枝杆菌,结核接触者追踪分枝杆菌感染重组结核杆菌融合蛋白

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Influence of hierarchical ZSM-5 catalysts with various acidity on the dehydration of glycerol to acrolein

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Magnetic Resonance Letters 2021年第1期1卷 71-80页

作者： Shufang Zhao Songlin He Kyung Du Kim Lizhuo wang Ryong Ryoo zichun wang Jun Huang Laboratory for Catalysis Engineering School of Chemical and Biomolecular EngineeringSydney Nano InstituteThe University of SydneyNSW2006Australia Center for Nanomaterials and Chemical Reactions Institute for Basic Science(IBS)Daejeon305-701South Korea Department of Chemistry Korea Advanced Institute of Science and TechnologyDaejeon34141South Korea Department of Engineering Macquarie UniversitySydneyNew South Wales2109Australia

The main challenge in the dehydration of glycerol to acrolein lies in overcoming catalystdeactivation and improving the selectivity to acrolein. The relationship between theacidity in the mesoporous channels and catalytic performance of glycerol dehydration israrely reported. In this work, to investigate the influence of acidity in the mesoporouschannels of hierarchical ZSM-5 catalysts on the dehydration of glycerol to acrolein, a seriesof hierarchical ZSM-5 zeolites with comparable mesoporous volume and mesoporous sizebut different acid properties in mesopores have been successfully prepared via alkalinetreatment. The sample with the abundant mesoporosity and highest acidity display thebest performance.

关键词： Zeolites Hierarchical pores Acidity Glycerol dehydration NMR

高强化条件下离子液体对活塞环-气缸套摩擦磨损性能的影响研究

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汽车工程师 2024年第7期 24-33页

作者：郜智伟黄若轩秦学王一然王子淳范君静中国第一汽车股份有限公司研发总院长春130013 中国北方发动机研究所天津300000 大连海事大学大连116026

为探究高强化运行工况下离子液体(IL)添加剂对内燃机关键配对副、氮化气缸套-喷钼活塞环摩擦学性能的影响,采用离子液体质量分数为2%的润滑油润滑配对副,通过分析磨损后配对副的表面微观形貌、成分以及摩擦化学反应产物,探究配对副在离... 详细信息

为探究高强化运行工况下离子液体(IL)添加剂对内燃机关键配对副、氮化气缸套-喷钼活塞环摩擦学性能的影响,采用离子液体质量分数为2%的润滑油润滑配对副,通过分析磨损后配对副的表面微观形貌、成分以及摩擦化学反应产物,探究配对副在离子液体润滑条件下的磨损行为及其相关机制,评价其对配对副摩擦、磨损和磨损特性的影响。试验结果表明:离子液体添加剂有助于提升氮化气缸套-喷钼活塞环配对副的摩擦学性能;在180℃条件下,离子液体具有最佳的摩擦学性能,该现象与离子液体在气缸套表面上的摩擦化学反应及其产物有关。

关键词：离子液体摩擦学性能氮化气缸套

药食同源组方对RAW 264.7巨噬细胞的免疫调节作用

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食品工业 2024年第5期45卷 141-148页

作者：郭海云王子纯王成祥柳嘉段盛林刘士伟河北同福健康产业有限公司石家庄051430 北京林业大学北京100083 中国食品发酵工业研究院有限公司北京100015 功能主食创制与慢病营养干预北京市重点实验室北京100015

以红参、阿胶、茯苓、山药、枸杞为原料研制出3个药食同源组方并探究其对小鼠单核巨噬细胞(RAW264.7细胞)的免疫调节活性及作用机制。采用Cell Counting Kit-8 (CCK-8)法检测不同浓度制剂作用下的RAW264.7细胞增殖情况;利用酶联免疫(ELI... 详细信息

以红参、阿胶、茯苓、山药、枸杞为原料研制出3个药食同源组方并探究其对小鼠单核巨噬细胞(RAW264.7细胞)的免疫调节活性及作用机制。采用Cell Counting Kit-8 (CCK-8)法检测不同浓度制剂作用下的RAW264.7细胞增殖情况;利用酶联免疫(ELISA)法分析3个药食同源组方对RAW 264.7巨噬细胞吞噬能力、一氧化氮(NO)、活性氧(ROS)、白细胞介素-1β (IL-1β)、白细胞介素-6 (IL-6)和肿瘤坏死因子(TNF-α)细胞因子分泌量的影响。50~200μg/mL时, 3个药食同源组方对RAW 264.7巨噬细胞无毒害作用。ELISA试验结果表明,质量浓度200μg/mL时,药食同源组方可明显促进RAW 264.7巨噬细胞的产NO能力(P<0.05)。此外, 3个药食同源组方对RAW 264.7巨噬细胞的吞噬能力、细胞内ROS生成量及细胞因子分泌量均有不同程度的促进作用。采用网络药理学构建成分-疾病靶点交集基因的PPI网络图,结果表明3个药食同源组方能通过调控AKT1、STAT3、TNF、EGFR、SRC、ESR1、MMP9等靶点提高机体免疫力。研究表明, 3个药食同源组方均能通过提高免疫应答发挥免疫调节作用,具有多成分、多靶点、多通路的特点。

关键词：免疫调节 RAW 264.7巨噬细胞药食同源组方细胞因子网络药理学

长期污染土壤不同组分中多环芳烃的分布特征及其毒性当量

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亚热带资源与环境学报 2024年第1期19卷 61-69页

作者：张文敏王子淳陈卫锋魏然倪进治福建师范大学地理研究所福州350117 福建师范大学、福建省植物生理生态重点实验室福州350117 福建师范大学地理科学学院、碳中和未来技术学院福州350117

土壤有机质(SOM)是影响多环芳烃(PAHs)土壤环境行为的重要因素,不同SOM组分的含量和结构不同,对PAHs的富集能力和环境风险的影响也应有所不同。结合比重和粒径分组方法,将4种长期污染土壤的SOM分成轻组有机质(LF)、粗矿物结合态有机质(C... 详细信息

土壤有机质(SOM)是影响多环芳烃(PAHs)土壤环境行为的重要因素,不同SOM组分的含量和结构不同,对PAHs的富集能力和环境风险的影响也应有所不同。结合比重和粒径分组方法,将4种长期污染土壤的SOM分成轻组有机质(LF)、粗矿物结合态有机质(CMAOM)(>53μm)和细矿物结合态有机质(FMAOM)(<53μm)3个组分,研究了15种PAHs在不同组分中的分配特征,并采用苯并[a]芘(BaP)毒性当量浓度(TEQ_(BaP))评估了LF、CMAOM和FMAOM中PAHs的环境风险。结果表明,4种土壤中15种PAHs总量的范围为3.78~16.96 mg·kg^(-1)。LF中PAHs总量的范围为128.23~355.78 mg·kg^(-1),分别为CMAOM(3.55~19.28 mg·kg^(-1))和FMAOM(1.80~13.83 mg·kg^(-1))的9.5~36.2倍和14.2~71.3倍。LF只占土壤质量的0.5%~3.5%,但其富集的PAHs却占原土PAHs总量的12.3%~61.8%。不同SOM组分对PAHs的富集能力存在差异,但富集的PAHs组成相似。在各SOM组分中,LF中PAHs的TEQ_(BaP)最高,分别是CMAOM和FMAOM的9.7~35.3倍和14.7~79.7倍。土壤中LF有机质的周转速率较快,其结合的PAHs环境风险也会相对较高,在PAHs污染土壤的环境风险评估和修复研究中应予以重视。

关键词：土壤有机质组分多环芳烃分配特征毒性当量

Research Progress,Problems and Prospects of"Non-grain"of Cultivated Land in China

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Asian Agricultural Research 2022年第7期14卷 26-31页

作者： zichun wang Zisheng YANG Institute of Land&Resources and Sustainable Development Yunnan University of Finance and EconomicsKunming 650221China

This study aims to sort out the relevant research results of"non-grain"of cultivated land in China,summarize the research progress,and put forward questions and prospects,so as to provide theoretical reference for the research on solving the problem of"non-grain"of cultivated land to ensure food security and promote industrial *** analysis and comparative analysis were *** of the previous studies used the planting structure to measure the"non-grain"level of cultivated land,and few studies took changes in the quality and quantity of cultivated land as the breakthrough *** the research scale,most of them were carried out in provinces and municipalities,and there were few multi-scale coupling studies that combined macro and micro *** factors and macro management and control strategies were the main research content,and there was little research on the construction of regional synergistic *** terms of research methods,most of them were quantitative analysis using mathematical statistical models,and few studies combined spatial analysis technology,model simulation and other *** is necessary to build a system for measuring the"grain"level of cultivated land,improve the accuracy of research results,strengthen multi-scale coupling research on"point,line,plane,and volume",establish a regional collaborative governance mechanism,explore the application of 3S technology and geographic simulation,and grasp the temporal and spatial evolution and development trend of"non-grain"of cultivated land.

关键词： "Non-grain"of cultivated land Research progress Prospects

High population and dispersion of pentacoordinated Al~Ⅴ species on the surface of ?ame-made amorphous silica-alumina

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Science Bulletin 2019年第8期64卷 516-523页

作者： zichun wang Yijiao Jiang Xianfeng Yi Cuifeng Zhou Aditya Rawal James Hook Zongwen Liu Feng Deng Anmin Zheng Michael Hunger Alfons Baiker Jun Huang School of Chemical and Biomolecular Engineering & Sydney Nano Institute The University of Sydney Department of Engineering Macquarie University State Key Laboratory Magnetic Resonance & Atomic Molecular Physics Wuhan Institute of Physics & Mathematics Chinese Academy of Sciences Mark Wainwright Analytical Centre University of New South Wales Institute of Chemical Technology University of Stuttgart Department of Chemistry and Applied Bioscience ETH Zürich

Pentacoordinated Al(Al~Ⅴ)species in silica-alumina are promising to promote the formation of acid sites or act as surface defects for tailoring single-atom ***,pentahedral coordination(Al~Ⅴ)is rarely observed in conventionally prepared ***,we show that high population and dispersion of Al~Ⅴ species on the surface of amorphous silica-alumina(ASA)can be achieved by means of flame spray *** resolution TEM/EDX,high magnetic-field NMR and DFT calculations are employed to characterize the structure of as-prepared ***-state ^(27)Al multi-quantum MAS NMR experiments show that most of the Al~Ⅴspecies are formed independently from the alumina phase and are accessible for guest molecules on the *** water adsorption,these Al~Ⅴ species are transformed to Al~Ⅵ species,structurally similar to surface Al~Ⅳ species,as confirmed by DFT *** outstanding catalytic activity of as-synthesized ASA is demonstrated using the in situ H/D exchange reaction with deuterated benzene as an *** Al~Ⅴ-rich ASA provides a much lower activation energy(～30 kJ/mol)than that reported for zeolite H-ZSM-5(～60 kJ/mol).The superior catalytic performance is attributed to the high Al~Ⅴcontent promoting the surface active sites in *** knowledge gained on the synthesis of Al~Ⅴ-rich ASAs and the nature of aluminum coordination in these materials could pave the way to more efficient silica-alumina based catalysts.

关键词： Amorphous silica-alumina Pentacoordinated Al~Ⅴ species 27Al multiple quantum magic-angle-spinning NMR H/D exchange