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Response of drought to climate extremes in a semi-arid inland river basin in China

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Journal of Arid Land 2024年第11期16卷 1505-1521页

作者： QU Zhicheng YAO shunyu LIU Dongwei School of Ecology and Environment Inner Mongolia UniversityHohhot 010021China

Against the backdrop of global warming,climate extremes and drought events have become more severe,especially in arid and semi-arid *** study forecasted the characteristics of climate extremes in the Xilin River Basin(a semi-arid inland river basin)of China for the period of 2021–2100 by employing a multi-model ensemble approach based on three climate Shared Socioeconomic Pathway(SSP)scenarios(SSP1-2.6,SSP2-4.5,and SSP5-8.5)from the latest Coupled Model Intercomparison Project Phase 6(CMIP6).Furthermore,a linear regression,a wavelet analysis,and the correlation analysis were conducted to explore the response of climate extremes to the Standardized Precipitation Evapotranspiration Index(SPEI)and Streamflow Drought Index(SDI),as well as their respective trends during the historical period from 1970 to 2020 and during the future period from 2021 to *** results indicated that extreme high temperatures and extreme precipitation will further intensify under the higher forcing scenarios(SSP5-8.5>SSP2-4.5>SSP1-2.6)in the *** SPEI trends under the SSP1-2.6,SSP2-4.5,and SSP5-8.5 scenarios were estimated as–0.003/a,–0.004/a,and–0.008/a,respectively,indicating a drier future *** the historical period(1970–2020),the SPEI and SDI trends were–0.003/a and–0.016/a,respectively,with significant cycles of 15 and 22 a,and abrupt changes occurring in 1995 and 1996,*** next abrupt change in the SPEI was projected to occur in the *** SPEI had a significant positive correlation with both summer days(SU)and heavy precipitation days(R10mm),while the SDI was only significantly positively correlated with ***,the SPEI and SDI exhibited a strong and consistent positive correlation at a cycle of 4–6 a,indicating a robust interdependence between the two *** findings have important implications for policy makers,enabling them to improve water resource management of inland river basins in arid and semi-arid areas under future

关键词： climate extremes climate change Standardized Precipitation Evapotranspiration Index(SPEI) Streamflow Drought Index(SDI) wavelet analysis multi-model ensemble Xilin River Basin

Tip-Based Nanomachining on Thin Films:A Mini Review

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Nanomanufacturing and Metrology 2022年第1期5卷 2-22页

作者： shunyu Chang Yanquan Geng Yongda Yan Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbin 150001China Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001People's Republic of China

As one of the most widely used nanofabrication methods,the atomic force microscopy(AFM)tip-based nanomachining technique offers important advantages,including nanoscale manipulation accuracy,low maintenance cost,and flexible experimental *** technique has been applied to one-,two-,and even three-dimensional nanomachining patterns on thin films made of polymers,metals,and two-dimensional *** structures are widely used in the fields of nanooptics,nanoelectronics,data storage,super lubrication,and so ***,they are believed to have a wide application in other fields,and their possible industrialization may be realized in the *** this work,the current state of the research into the use of the AFM tip-based nanomachining method in thin-film machining is ***,the state of the structures machined on thin films is reviewed according to the type of thin-film materials(i.e.,polymers,metals,and two-dimensional materials).Second,the related applications of tip-based nanomachining to film machining are ***,the current situation of this area and its potential development direction are *** review is expected to enrich the understanding of the research status of the use of the tip-based nanomachining method in thin-film machining and ultimately broaden its application.

关键词： Atomic force microscopy Tip-based nanomachining Thin films Nanostructure Application

Small-scale fire tests in the underwater tunnel section model with new sidewall smoke extraction

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Deep Underground Science and Engineering 2024年第2期3卷 247-254页

作者： shunyu Yue Ruifeng Miao Huihang Cheng Maohua Zhong Xiujun Yang Department of Engineering Physics Institute of Public Safety ResearchTsinghua UniversityBeijingChina Shanxi Province Expressway Group Limited Liability Company Shanxi Expressway Group Shuoshen Co. LtdShuozhouChina Research Institute of Highway Ministry of Transport RIOH Transport ConsultantsLtdBeijingChina

The Shenzhen–Zhongshan Bridge is a 24‐km‐long bridge and tunnel system,including a 6.8-km-long super cross section subsea *** solve the smoke exhaust problem of a super large cross-section subsea tunnel,the tunnel has a new smoke exhaust system that combines a horizontal smoke exhaust cross section at the top and sidewall smoke exhaust *** order to evaluate the potential fire hazards of this type of tunnel,a 1:30 tunnel model was established and 140 smallscale experiments on underwater tunnel fires were *** changing the fire power,fire location,and fan operation mode,different scenarios of submarine immersed tunnel fire were simulated and the related key parameters such as fire smoke diffusion behavior and smoke temperature distribution were *** this basis,the optimal smoke control strategy was proposed for different fire *** research results indicate that the new smoke exhaust system can fully utilize the smoke flow characteristics,significantly improve smoke exhaust efficiency,and increase available evacuation time,thus further enhancing the fire safety of super large cross-section subsea tunnels.

关键词： sidewall smoke extraction system small‐scale fire tests smoke control

Investigation of suitable precursors for manganese oxide catalysts in ethyl acetate oxidation

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Journal of Environmental Sciences 2021年第6期33卷 17-26页

作者： Yan Zhang Meng Wang shunyu Kang Tingting Pan Hua Deng Wenpo Shan Hong He Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationChinese Academy of SciencesNingbo 315800China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The control of ethyl acetate emissions from fermentation and extraction processes in the pharmaceutical industry is of great importance to the *** have developed three Mn_(2)O_(3)catalysts by using different Mn precursors(MnCl_(2),Mn(CH_(3)COO)_(2),MnSO_(4)),named as Mn_(2)O_(3)-Cl,-Ac,-SO_(4).The tested catalytic activity results showed a sequence with Mn precursors as:Mn_(2)O_(3)-Cl>Mn_(2)O_(3)-Ac>Mn_(2)O_(3)-SO_(4).The Mn_(2)O_(3)-Cl catalyst reached a complete ethyl acetate conversion at 212℃(75℃lower than that of Mn_(2)O_(3)-SO_(4)),and this high activity 100%could be maintained high at 212℃for at least 100 *** characterization data about the physical properties of catalysts did not show an obvious correlation between the structure and morphology of Mn_(2)O_(3)catalysts and catalytic performance,neither was the surface area the determining factor for catalytic activity in the ethyl acetate *** we firstly found there is a close linear relationship between the catalytic activity and the amount of lattice oxygen species in the ethyl acetate oxidation,indicating that lattice oxygen species were essential for excellent catalytic *** H_(2)temperature-programmed reduction(H_(2)-TPR)results,we found that the lowest initial reduction temperature over the Mn_(2)O_(3)-Cl had stronger oxygen mobility,thus more oxygen species participated in the oxidation reaction,resulting in the highest catalytic *** convenient preparation,high efficiency,and stability,Mn_(2)O_(3)prepared with MnCl_(2)will be a promising catalyst for removing ethyl acetate in practical application.

关键词： Ethyl acetate Catalytic oxidation Manganese Precursor Lattice oxygen species

Inducing photocarrier separation via 3D porous faveolate cross-linked carbon to enhance photothermal/pyroelectric property

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Advanced Powder Materials

Advanced Powder Materials 2022年第3期1卷 88-98页

作者： Meng Li Jingxue Sun Gang Chen Shuang Wang shunyu Yao MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

The CdS/Bi_(2)S_(3) supported three-dimensional(3D)porous faveolate carbon structure(CdS/Bi_(2)S_(3)@C)composite photocatalyst was ***_(2)S_(3) nanoparticles are regarded as photothermal agents and pyroelectric materials to absorb near infrared light(NIR)and convert it into heat.3D porous faveolate of carbon acts as incubator to reduce heat loss and optimize photothermal *** is a greater fluctuating temperature difference(ΔΤ)between photothermal effect of Bi_(2)S_(3) and cold photocatalytic *** enhances the pyroelectric effect that Bi_(2)S_(3) undergoes spontaneous polarization and releases the surface ***,the separation of electrons and holes in the CdS photocatalyst can be *** COMSOL simulation results show that,the higher pyroelectric potential producted by largerΔΤis more favorable to the photocatalytic *** hydrogen evolution rate of CdS/Bi_(2)S_(3)@C photocatalyst can reach 5.88 mmol·g^(-1)·h^(-1) with excellent cycle stability.

关键词： 3D porous faveolate structure Incubator Photothermal/pyroelectric Spontaneous polarization COMSOL simulation

Wearable pressure sensors based on antibacterial and porous chitosan hydrogels for full-range human motion detection

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Science China(Technological Sciences) 2024年第8期67卷 2475-2484页

作者： ZHANG YingXin LIU HanGuang JIN shunyu LI YaJuan ZHANG Wan ZHOU Hang NIE ZanXiang HUANG Yuan School of Microelectronics Science and Technology Sun Yat-sen UniversityGuangzhou 510275China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230022China Department of Clinical Laboratory the First Affiliated Hospital of Anhui Medical UniversityHefei 230022China School of Electronic and Computer Engineering Peking University Shenzhen Graduate SchoolShenzhen 518055China Zinergy Shenzhen Ltd. Shenzhen 518109China

Wearable pressure sensors made from conductive hydrogels hold significant potential in health ***,limited pressure range(Pa to hundreds of kPa)and inadequate antibacterial properties restrict their practical applications in diagnostic and health ***,a wearable high-performance pressure sensor was assembled using a facilely prepared porous chitosan-based hydrogel,which was constructed from commercial phenolphthalein particles as a sacrificial *** relationship between the porosity of hydrogels and sensing performance of sensors was systematically ***,the wearable pressure sensor,featuring an optimized porosity of hydrogels,exhibits an ultrawide sensing capacity from 4.83 Pa to 250 k Pa(range-to-limit ratio of 51,760)and high sensitivity throughout high pressure ranges(0.7 kPa~(-1),120–250 kPa).The presence of chitosan endows these hydrogels with outstanding antibacterial performance against *** and ***,making them ideal candidates for use in wearable *** features allow for a practical approach to monitor full-range human motion using a single device with a simple structure.

关键词： porous hydrogels antibacterial performances wearable pressure sensors full-range human motion chitosan

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NiO nanosheet assembles for supercapacitor electrode materials

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Progress in Natural Science:Materials International 2016年第3期26卷 271-275页

作者： Huanhao Xiao shunyu Yao Hongda Liu Fengyu Qu Xu Zhang Xiang Wu College of Chemistry and Chemical Engineering Harbin Normal University

In this paper, large scale hierarchically assembled Ni O nanosheets have been favorably fabricated through a facile hydrothermal route. The as-prepared Ni O nanosheet assembles were characterized in detail by various analytical techniques. The results showed these nanosheets present the thickness of about 30 nm and the surface area is 116.9 m2g-1. These NiO nanosheet assembles were used as the working electrode materials in electrochemical tests, which demonstrated a specific capacitance value of 81.67 Fg-1at the current density of 0.5 Ag-1and excellent long cycle-life stability with 78.5% of its discharge specific capacitance retention after 3000 cycles at the current density of 0.5 Ag-1, revealing the as-synthesized NiO nanosheet assembles might be a promising electrode material for supercapacitor applications.

关键词： NiO Nanosheets Electrochemical Supercapacitor electrode

Significant enhancement in water resistance of Pd/Al2O3 catalyst for benzene oxidation by Na addition

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Chinese Chemical Letters 2019年第7期30卷 1450-1454页

作者： shunyu Kang Meng Wang Na Zhu Chunying Wang Hua Deng Hong He Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China University of Chinese Academy of Sciences Beijing 100049 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

A series of Na-doped 1 wt% Pd/Al2O3 catalysts with different Na loadings were prepared by wet impregnation and tested for the catalytic oxidation of benzene. Suitable addition of Na had a remarkable promotion effect on water resistance and enhancement of low temperature activity of Pd/Al2O3 catalysts. The optimal mole ratio between Na and Pd was 1:1. The properties of the prepared catalysts were characterized by X-ray diffraction (XRD), Brunauer Emmett Teller (BET), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), O2-temperature-programmed desorption (O2-TPD), and in situ DRIFTS. Results indicated that the addition of Na not only decreased the content of adsorbed water species but also increased the amount of liable surface oxygen species, which are likely the key factors for the excellent water resistance of the catalyst. Na addition also improved the mobility of the lattice oxygen species, which was favorable for catalytic activity. Moreover, the well-dispersed negatively charged Pd particles and suitable redox properties derived from Na addition also contributed to the improved performance and water resistance of the Na1Pd1/Al2O3 catalyst. In situ DRIFTS results revealed that benzene was oxidized to maleate and acetate species via intermediate o-benzoquinone species, which finally turned into harmless CO2 and H2O.

关键词： Sodium addition Pd/Al2O3 Benzene Water resistance Catalytic oxidation

Comparison of immune responses and intestinal flora in epicutaneously sensitized BALB/c or C57BL/6 mouse models of food allergy

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Food Science and Human Wellness 2024年第2期13卷 668-680页

作者： Gang Yu Yuhao Jiang Shuifeng Zhang Pengpeng Liu shunyu Wang Huadong Sheng Yanbo Wang Qiaozhi Zhang Linglin Fu Food Safety Key Laboratory of Zhejiang Province School of Food Science and BiotechnologyZhejiang Gongshang UniversityHangzhou 310018China Zhejiang Fangyuan Test Group Co. Ltd.Hangzhou 310018China Key Laboratory of Biosafety Detection for Zhejiang Market Regulation Hangzhou 310018China Zhejiang Liziyuan Food Co. LtdJinhua 321031China

Cutaneous exposure to food allergens through a disrupted skin barrier is recognized as an important cause of food allergy,and the cutaneous sensitized mouse model has been established to investigate relevant allergic ***,the role of different genetic backgrounds of mice on immune responses to food allergens upon epicutaneous sensitization is largely *** this study,two strains of mice,i.e.,the BALB/c and C57BL/6 mice,were epicutaneously sensitized with ovalbumin on atopic dermatitis(AD)-like skin lesions,followed by intragastric challenge to induce IgE-mediated food *** outcomes were measured as clinical signs,specific antibodies and cytokines,and immune cell subpopulations,as well as changes in intestinal barrier function and gut *** showed that both strains of mice exhibited typical food-allergic symptoms with a Th2-skewed *** C57BL/6 mice,rather than the BALB/c mice,were fitter for establishing an epicutaneously sensitized model of food allergy since a stronger Th2-biased response and severer disruptions in the intestinal barrier and gut homeostasis were *** study provides knowledge for selecting an appropriate mouse model to study food-allergic responses associated with AD-like skin lesions and highlights the role of genetic variations in the immune mechanism underlying pathogenesis of food allergy.

关键词： Food allergy Mouse models Epicutaneous sensitization Th2 response Gut microbiota