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Nonlinear proinflammatory effect of short-term PM_(2.5)exposure:A potential role of lipopolysaccharide

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Journal of Environmental Sciences 2024年第2期136卷 292-300页

作者： Fangxia Shen Mutong Niu haoxuan Chen Ting Zhang Jing Li Haijie Tong Yan Wu School of Space and Environment Beihang UniversityBeijing 100191China College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China Institute of Surface Science Helmholtz-Zentrum HereonGeesthacht 21502Germany School of Environmental Science and Engineering Shandong UniversityJinan 250100China

The association between PM_(2.5)(particulate matter≤2.5μm)short-term exposure and its health effect is non-linear from the epidemiological studies.And this nonlinearity is suggested to be related with the PM_(2.5)heterogeneity,however,the underlying biological mechanism is still unclear.Here,a total of 38 PM_(2.5)filters were collected continuously for three weeks in winter Beijing,with the ambient PM_(2.5)varying between 10 and 270μg/m^(3).Human monocytes-derived macrophages(THP-1)were treated with PM_(2.5)water-soluble elutes at10μg/mL to investigate the PM_(2.5)short-term exposure effect from a proinflammatory perspective.The proinflammatory cytokine tumor necrosis factor(TNF)induced by the PM_(2.5)elutes at equal concentrations were unequal,showing the heterogeneity of PM_(2.5)proinflammatory potentials.Of the various chemical and biological components,lipopolysaccharide(LPS)showed a strong positive association with the TNF heterogeneity.However,some outliers were observed among the TNF-LPS association.Specifically,for PM_(2.5)from relatively clean air episodes,the higher LPS amount corresponded to relatively low TNF levels.And this phenomenon was also observed in the promotion tests by treating macrophages with PM_(2.5)elutes dosed with additional trace LPS.Gene expression analysis indicated the involvement of oxidative-stress related genes in the LPS signaling pathway.Therefore,a potential oxidative-stress-mediated suppression on the PM_(2.5)-borne LPS proinflammatory effect was proposed to be accounted for the outliers.Overall,the results showed the differential role of LPS in the heterogeneity of PM_(2.5)proinflammatory effects from a component-based perspective.Future experimental studies are needed to elucidate the signaling pathway of LPS attached on PM_(2.5)from different air quality episodes.

关键词： Fine PM PM_(2.5)pro-inflammatory effects Aerosol health effect Endotoxin Oxidative stress

Sungai Lembing’s green tourism: Pioneering the future of resourcebased urban renewal

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The Innovation 2024年第2期5卷 19-20页

作者： haoxuan Yu Ginura Gunaratna Izni Zahidi Chow Ming Fai Department of Civil Engineering School of EngineeringMonash University MalaysiaBandar SunwaySelangor 47500Malaysia

HOW DID SUNGAI LEMBING PAVE ITS PATH TO A GREEN EVOLUTION?Sungai Lembing,a resource-based town situated in Pahang,Malaysia,has historically positioned itself as a pivotal hub in the global tin mining sector.Geologically,Sungai Lembing’s history dates back to the Paleozoic and Mesozoic eras.These eras were marked by the closure of the Tethyan Ocean and the convergence of continental landmasses from the eastern part of the Gondwana continent.This complex geological background resulted in a wide variety of mineral resources.

关键词： situated eastern Pioneer

Diverse atomic structure configurations of metal-doped transition metal dichalcogenides for enhancing hydrogen evolution

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Nano Research 2024年第5期17卷 3586-3602页

作者： Longlu Wang Yuxin Zhang Chen Gu haoxuan Yu Yanling Zhuang Zechao Zhuang College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology) Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and DevicesNanjing University of Posts and TelecommunicationsNanjing 210023China Department of Chemical Engineering Columbia UniversityNew YorkNY 10027USA

Doping foreign metal atoms into the substrate of transition metal dichalcogenides(TMDs)enables the formation of diverse atomic structure configurations,including isolated atoms,chains,and clusters.Therefore,it is very important to reasonably control the atomic structure and determine the structure-activity relationship between the atomic configurations and the hydrogen evolution reaction(HER)performance.Although numerous studies have indicated that doping can yield diverse atomic structure configurations,there remains an incomplete understanding of the relationship between atomic configurations within the lattice of TMDs and their performance.Here,diverse atomic structure configurations of adsorptive doping,substitutional doping,and TMDs alloys are summarized.The structure-activity relationship between different atomic configurations and HER performance can be determined by micro-nanostructure devices and density functional theory(DFT)calculations.These diverse atomic structure configurations are of great significance for activating the inert basal plane of TMDs and improving the catalytic activity of HER.Finally,we have summarized the current challenges and future opportunities,offering new perspectives for the design of highly active and stable metal-doped TMDs catalysts.

关键词： transition metal dichalcogenides(TMDs) dopant effect diverse atomic structure configurations hydrogen evolution reaction(HER)

Designing multi-heterogeneous interfaces of Ni-MoS_(2)@NiS_(2)@Ni_(3)S_(2)hybrid for hydrogen evolution

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Nano Research 2024年第6期17卷 4782-4789页

作者： haoxuan Yu Junan Pan Yuxin Zhang Longlu Wang Huachao Ji Keyu Xu Ting Zhi Zechao Zhuang College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts&Telecommunications(NJUPT)Nanjing 210023China Department of Chemical Engineering Columbia UniversityNew YorkNY 10027USA

The transition metal chalcogenides represented by MoS_(2)are the ideal choice for non-precious metal-based hydrogen evolution catalysts.However,whether in acidic or alkaline environments,the catalytic activity of pure MoS_(2)is still difficult to compete with Pt.Recent studies have shown that the electronic structure of materials can be adjusted by constructing lattice-matched heterojunctions,thus optimizing the adsorption free energy of intermediates in the catalytic hydrogen production process of materials,so as to effectively improve the electrocatalytic hydrogen production activity of catalysts.However,it is still a great challenge to prepare heterojunctions with lattice-matched structures as efficient electrocatalytic hydrogen production catalysts.Herein,we developed a one-step hydrothermal method to construct Ni-MoS_(2)@NiS_(2)@Ni_(3)S_(2)(Ni-MoS_(2)on behalf of Ni doping MoS_(2))electrocatalyst with multiple heterogeneous interfaces which possesses rich catalytic reaction sites.The Ni-MoS_(2)@NiS_(2)@Ni_(3)S_(2)electrocatalyst produced an extremely low overpotential of 69.4 mV with 10 mA·cm^(−2)current density for hydrogen evolution reaction(HER)in 1.0 M KOH.This work provides valuable enlightenment for exploring the mechanism of HER enhancement to optimize the surface electronic structure of MoS_(2),and provides an effective idea for constructing rare metal catalysts in HER and other fields.

关键词： MoS_(2) heterojunctions multiple heterogeneous interfaces hydrogen evolution

Effective strategies to promote Z(S)-scheme photocatalytic water splitting

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Chinese Chemical Letters 2024年第3期35卷 27-39页

作者： Ye Yuan Junan Pan Weinan Yin haoxuan Yu Fengshun Wang Weifeng Hu Longlu Wang Dafeng Yan College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China College of Chemistry and Chemical Engineering Hubei UniversityWuhan 430062China

Artificial Z(S)-scheme photocatalytic water splitting systems have attracted extensive attention due to their advantages such as wide light absorption range,high charge separation efficiency and strong carrier redox ability.However,it is still challenging to design and prepare Z(S)-scheme photocatalysts with low-cost and highly stability for efficiently photocatalytic overall water splitting using solar energy.This review mainly introduces various strategies to improve the photocatalytic water splitting performance of Z(S)-scheme systems.These strategies mainly focus on enhancing or extending the range of light absorption,promoting charge separation,and enhancing surface redox reaction in Z(S)-scheme systems.Finally,the main challenges of Z(S)-scheme photocatalytic water splitting systems and their future development directions are pointed out.This review would be beneficial to understanding the challenges and opportunities faced by the research field of Z(S)-scheme photocatalytic systems,and has important guiding significance for the development and utilization of high-performance Z(S)-scheme photocatalytic reaction system in the future.

关键词： Z(S)-scheme Overall water splitting Light absorption Charge separation Loading co-catalyst

受热通道内超临界R134a流动阻力特性试验研究

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太阳能学报 2024年第5期45卷 584-592页

作者：颜建国朱旭涛田浩轩郑书闽西安理工大学省部共建西北旱区生态水利国家重点实验室西安710048

以超临界R134a流体为工质,测试其在内径2 mm圆管内,流体压强p=4.3~4.9 MPa,质量流速G=550~1650 kg/(m^(2)·s),热流密度q=25~75 kW/m^(2)(电加热模拟热源)工况条件下的流动阻力。根据摩擦压降曲线特征,将其划分为类液相区、类两相区和... 详细信息

以超临界R134a流体为工质,测试其在内径2 mm圆管内,流体压强p=4.3~4.9 MPa,质量流速G=550~1650 kg/(m^(2)·s),热流密度q=25~75 kW/m^(2)(电加热模拟热源)工况条件下的流动阻力。根据摩擦压降曲线特征,将其划分为类液相区、类两相区和类气相区3个区域。分析压强、质量流速和热流密度等工况参数对3个区域内的摩擦压降和摩擦因子的影响规律。在类两相区,摩擦因子曲线存在一个明显的峰值特性。将试验数据与已有的摩擦因子关联式进行对比,并进行定量评价。结果显示,已有关联式的预测误差普遍偏大,尤其是在类两相区域。为此,提出一个同时包含密度、黏度和平均普朗特数修正的超临界流体摩擦因子关联式,与试验数据对比显示,97%预测数据均处于±20%的误差范围内。

关键词：可再生能源超临界流体压降多相流摩擦因子超临界有机朗肯循环

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农业高质量发展机制是如何形成的——基于福特主义及其在全球扩散的考察

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当代经济研究 2024年第4期344卷 75-87页

作者：罗浩轩四川省社会科学院成都610059 西南财经大学成都611130

农业高质量发展具有整体性、机理性、历时性和全球性特征。农业高质量发展是由农业生产率、农业收入和农业资本积累率三个密切关联指标构成的动态协同增长机制,也是由技术进步诱发的农业生产方式、制度形式和积累体制变迁的良性结果。... 详细信息

农业高质量发展具有整体性、机理性、历时性和全球性特征。农业高质量发展是由农业生产率、农业收入和农业资本积累率三个密切关联指标构成的动态协同增长机制,也是由技术进步诱发的农业生产方式、制度形式和积累体制变迁的良性结果。福特主义在农业高质量发展机制形成过程中扮演着关键角色:它生成了规模化、机械化和专业化的福特制农业生产方式;引发了工业与农业融合,发展出了世界农产品市场,重塑了农业资本与劳动力的关系;福特主义在全球扩散中促进了农业高质量发展的良性循环。农业高质量发展机制的形成需要有关部门主动作为。后发国家要形成农业高质量发展机制,应当推进农业生产要素市场化改革、大力发展智慧农业和重塑农业产业价值链。

关键词：农业高质量发展协同增长机制福特主义规模报酬递增智慧农业

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基于输入整形的丝杠传动的振动误差补偿

组合机床与自动化加工技术 2024年第4期 167-170页

作者：郑飂默栾昊轩李备备中国科学院沈阳计算技术研究所沈阳110168 沈阳中科数控技术股份有限公司自动化装备事业部沈阳110168 中国科学院大学北京100049

针对丝杠传动系统中存在的由机械结构弹性形变产生的振动误差,首先,通过改进集中参数法与分布式参数法相结合的方法建立系统拉格朗日方程,从而求得动力学模型,得到X、Y方向上的传递函数,并将闭环传递函数进行降阶处理;然后,在Simulink... 详细信息

针对丝杠传动系统中存在的由机械结构弹性形变产生的振动误差,首先,通过改进集中参数法与分布式参数法相结合的方法建立系统拉格朗日方程,从而求得动力学模型,得到X、Y方向上的传递函数,并将闭环传递函数进行降阶处理;然后,在Simulink中仿真实验,根据降阶函数计算输入整形器参数,分别比较ZV输入整形和ZVD输入整形的误差补偿效果;最后,在自主研发的实验平台进行应用验证:在负载较轻的X轴运动时,两种补偿方法稳定性相差不多,ZV输入整形器调整时间更短;而在负载较重的Y轴运动时,ZVD输入整形器更稳定。

关键词：振动误差输入整形误差补偿滚珠丝杠系统

基于泌尿外科应用的350 W蓝光半导体激光器合束技术研究

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光电工程 2024年第4期51卷 30-38页

作者：郑暤翾胡烜瑜郑毅段长城肖瑜徐刚唐霞辉华中科技大学光学与电子信息学院湖北武汉430074

泌尿外科临床激光治疗的传统光源主要是掺铥激光、掺钬激光和掺钕倍频绿激光等。近年来,随着蓝光半导体激光单管功率逐渐提升,450 nm蓝光逐步被应用于膀胱肿瘤切除手术,具有切割干净、出血少、邻近组织无不良凝血等特点。本文针对泌尿... 详细信息

泌尿外科临床激光治疗的传统光源主要是掺铥激光、掺钬激光和掺钕倍频绿激光等。近年来,随着蓝光半导体激光单管功率逐渐提升,450 nm蓝光逐步被应用于膀胱肿瘤切除手术,具有切割干净、出血少、邻近组织无不良凝血等特点。本文针对泌尿外科应用所急需的高稳定性光纤耦合输出的蓝光激光器需求,研究了350 W光纤耦合蓝光半导体激光器,采用4个100 W阵列式蓝光单元作为光源,分析了多发光点阵列的光场传输特性,光强远场分布为双峰结构,峰值角为arcsin(5λ/4γd);基于空间合束技术,实现慢轴光束交叉叠加,消除发光死区;使用偏振合束技术,让一束光的偏振态由P光变为S光后与另一束P光垂直叠加,实现快轴光束的间距压缩,提高光束亮度;准直结构分别将光束快慢轴发散角缩小为0.6981 mrad和1.0123 mrad,快轴用1.2倍扩束系统将输出光斑变换为正方形。研究结果表明,所研发的激光器蓝光功率为358 W,输出光纤200μm/NA 0.22,合束效率为89.5%,电光转换效率31.3%,功率波动小于0.4%。选用通水光纤作为输出端,为泌尿外科临床治疗提供了更高功率的激光医疗方案。

关键词：激光技术激光医疗蓝光激光器合束技术高稳定性