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Regulating the electronic structure of Ir single atoms by ZrO_(2)nanoparticles for enhanced catalytic oxidation of formaldehyde at room temperature

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Chinese Chemical Letters 2024年第7期35卷 200-205页

作者： Shiqi Peng Yongfang rao Tan Li Yufei zhang Jun-ji Cao Shuncheng Lee Yu Huang Key Laboratory of Aerosol Chemistry&Physics State Key Laboratory of Loess and Quaternary Geology(SKLLQG)Institute of Earth EnvironmentChinese Academy of Sciences(CAS)Xi’an 710061China School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China School of Environment and Energy South China University of TechnologyGuangzhou 51006China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100190China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China

Developing low-loading single-atom catalysts with superior catalytic activity and selectivity in formaldehyde(HCHO)oxidation at room temperature remains ***,ZrO_(2)nanoparticles coupled low-loading Ir single atoms in N-doped carbon(Ir_(1)-N-C/ZrO_(2))was *** optimal Ir_(1)-N-C/ZrO_(2)with 0.25 wt%Ir loading delivers the high HCHO removal and conversion efficiency(>95%)at 20℃,which is higher than that over Ir_(1)-N-C with the same Ir *** specific rate can reach 1285.6 mmol gIr^(-1)h^(-1),surpassing the Ir based catalysts reported to *** functional theory calculation results and electron spin resonance spectra indicate that the introduction of Zr O_(2)nanoparticles modulate the electronic structure of the Ir single atoms,promoting O_(2)activation to·O_(2)^(–).Moreover,the Ir-C-Zr channel is favorable for the dissociation of·O_(2)^(–)to active oxygen atom(*O),and further accelerates the transformation of HCHO and intermediates(dioxymethylene and formates)to CO_(2)and H_(2)*** work provides a facile strategy to design low-loading single-atom catalysts with high catalytic activity toward HCHO oxidation.

关键词： ZrO_(2)nanoparticles Ir single atoms Electronic structure Formaldehyde Catalytic oxidation

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CVC驱动同业创新:溢出效应的机制检验

科研管理 2022年第5期43卷 23-33页

作者：张娆张玥南京农业大学金融学院江苏南京210095

公司创业投资(CVC)是当前创投领域的热点话题,对优化资本市场资金配置,促进企业高质量发展起着关键性作用。本文以2008—2018年我国A股上市公司为研究对象,考察与验证CVC对同业企业的溢出效应,以期确认CVC的外部创新激励作用。研究结果... 详细信息

公司创业投资(CVC)是当前创投领域的热点话题,对优化资本市场资金配置,促进企业高质量发展起着关键性作用。本文以2008—2018年我国A股上市公司为研究对象,考察与验证CVC对同业企业的溢出效应,以期确认CVC的外部创新激励作用。研究结果表明:(1)CVC与同业创新水平呈显著正相关,溢出效果存在;(2)探究其影响机制,投资公司创新是溢出效应产生的可能路径和关键节点;(3)进一步研究发现,CVC驱动同业创新的效应存在明显的场域特征,主要发生于行业经营风险低、市场化程度高的情境下。文章将CVC与溢出效应相结合,不仅拓展了CVC的理论框架,为CVC的功能呈现创造了新思路,为CVC的经济后果研究提供了新视角,同时为优化国家投融资政策、赋能行业协同创新提供经验证据,对企业践行创新驱动发展战略、助力双循环发展新格局亦具有参考意义。

关键词：公司创业投资(CVC) 同业创新溢出效应

Oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)particles in the air:Nonisothermal kinetic and reaction mechanism

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1839-1848页

作者： Junyi Xiang Xi Lu Luwei Bai Hongru rao Sheng Liu Qingyun Huang Shengqin zhang Guishang Pei Xuewei Lü School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Rep.of Korea College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

High-temperature oxidation behavior of ferrovanadium(FeV_(2)O_(4))and ferrochrome(FeCr_(2)O_(4))spinels is crucial for the application of spinel as an energy material,as well as for the clean usage of high-chromium vanadium ***,the nonisothermal oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)prepared by high-temperature solid-state reaction was examined by thermogravimetry and X-ray diffraction(XRD)at heating rates of 5,10,and 15 K/*** apparent activation energy was determined by the Kissinger-Akahira-Sunose(KAS)method,whereas the mechanism function was elucidated by the Malek ***,in-situ XRD was conducted to deduce the phase transformation of the oxidation mechanism for FeV_(2)O_(4)and FeCr_(2)O_(4).The results reveal a gradual increase in the overall apparent activation energies for FeV_(2)O_(4)and FeCr_(2)O_(4)during *** stages of the oxidation process are observed based on the oxidation conversion rate of each *** oxidation mechanisms of FeV_(2)O_(4)and FeCr_(2)O_(4)are complex and have distinct *** particular,the chemical reaction controls the entire oxidation process for FeV_(2)O_(4),whereas that for FeCr_(2)O_(4)transitions from a three-dimensional diffusion model to a chemical reaction *** to the in-situ XRD results,numerous intermediate products are observed during the oxidation process of both compounds,eventually resulting in the final products FeVO_(4)and V2O_(5)for FeV_(2)O_(4)and Fe_(2)O_(3)and Cr_(2)O_(3)for FeCr_(2)O_(4),respectively.

关键词： FeV_(2)O_(4) FeCr_(2)O_(4) oxidation nonisothermal kinetics mechanism

圆台-线栅型水平极化电磁脉冲模拟器的仿真分析

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建模与仿真 2024年第3期13卷 2359-2366页

作者：张饶段艳涛扶庆枫石立华陈海林胡南松王大略陆军工程大学电磁环境效应与光电工程重点实验室江苏南京解放军73047部队安徽滁州

以双锥–线栅型水平极化天线为原型,使用不同大小的圆柱体替换双锥的锥尖,设计出圆台–线栅型水平极化天线,并利用CST MWS电磁仿真软件计算了当激励源为双指数波时的两种天线结构的输出波形。将两种天线模型的输出波形分别与高空核电磁... 详细信息

以双锥–线栅型水平极化天线为原型,使用不同大小的圆柱体替换双锥的锥尖,设计出圆台–线栅型水平极化天线,并利用CST MWS电磁仿真软件计算了当激励源为双指数波时的两种天线结构的输出波形。将两种天线模型的输出波形分别与高空核电磁脉冲标准波形进行对比,结果显示:圆台–线栅型水平极化天线模型的仿真结果在主要参数上更贴近高空核电磁脉冲标准波形,其中,输出波形的场强峰值提升了2.47%,上升沿(脉冲从峰值的10%到峰值的90%的时间宽度)误差由20.40%减小为0.04%,半高宽误差由8.26%减小为1.46%。

关键词：圆台–线栅型双锥–线栅型水平极化天线峰值上升沿半高宽

Ocean wave directional spectrum estimation using spatio-temporal array of acoustic ranging and current measurement

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Chinese Journal of Acoustics 2024年第3期43卷 311-331页

作者： rao Liang DENG Kai zhang Zhaowei WANG Changhong Institute of Acoustics Chinese Academy of SciencesBeijing100190 University of Chinese Academy of Sciences Beijing100049 Beijing Engineering Technology Research Center of Ocean Acoustic Equipment Beijing100190

An approach to estimate ocean wave directional spectrum using spatio-temporal array of acoustic ranging and current measurement is proposed,and the 5-beam acoustic Doppler current profiler(ADCP)constructs a spatio-temporal array of acoustic ocean surface elevation tracking and acoustic Doppler current velocity measuring for directional wave *** on the linear wave theory and the space-time equivalence principle,the time-space transfer function applicable to the spatio-temporal array is proposed,and then the time delay term is compensated in the calculation of the covariance *** method can reduce the error of the directional spectrum *** results show that for the low signal-to-noise ratio from 0 dB to 5 dB,compared with the 4-beam synchronous array method,this method has a smaller root-mean-square error of the peak estimation of the directional *** field test shows that,compared with the 4-beam synchronous array method,the 5-beam spatio-temporal array method improves the kurtosis index of the directional spectrum from 2.31 to 2.80,and the correlation coefficient between the peak wave direction results of the ADCP and the buoy is increased from 0.80 to 0.83 in mild wave ***,the spatio-temporal array method can increase the degree of freedom of wave measurement,reduce the minimum aperture of the array,and increase the upper cut-off frequency of the estimable directional spectrum.

关键词： spectrum ocean directional

Physiological Mechanism of Exogenous Selenium in Alleviating Mercury Stress on Pakchoi(Brassica campestris L.)

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Phyton-International Journal of Experimental Botany 2024年第5期93卷 951-962页

作者： Chengxu Qian Qiangwen Chen Leiyu Jiang Xiaoyan Yang Shen rao Weiwei zhang Feng Xu College of Horticulture and Gardening Yangtze UniversityJingzhou434025China Enshi Se-Run Material Engineering Technology Co. Ltd.Enshi445000China Henry Fok School of Biology and Agricultural Shaoguan UniversityShaoguan512005China National R&D for Se-Rich Agricultural Products Processing Technology Wuhan Polytechnic UniversityWuhan430023China

The objective of this study was to explain the physiological mechanisms through which Na_(2)SeO_(3) mitigates the growth and developmental inhibition of pakchoi under HgCl_(2)*** results showed that treatment with HgCl_(2)(40 mg L^(−1))led to reduced biomass,dwarfing,root shortening,and root tip necrosis in *** to control(CK),the activities of superoxide dismutase(SOD)and peroxidase(POD)in Hg treatment increased,and the content of malondialdehyde(MDA)also dramatically increased,which negatively impacted the growth of *** concentrations of Na_(2)SeO_(3)(0.2 mg L^(−1))significantly increased the content of soluble sugars compared with control,while chlorophyll,soluble proteins,free amino acids,and vitamin C had no significant *** results of the mixed treatments with HgCl_(2)and Na_(2)SeO_(3) suggested that selenium may be able to reduce the toxicity of mercury in *** biomass,plant height,root length,chlorophyll content,soluble protein,other physiological indicators,and proline showed significant increases compared with the HgCl_(2)***,the MDA content and mercury accumulation in pakchoi *** results revealed the antagonistic effects of selenium and mercury in ***,a theoretical basis for studying pakchoi’s mercuryexcreted and selenium-rich cultivation technology was provided.

关键词： Selenium mercury stress pakchoi physiological properties antioxidant enzymes

Improved piezoelectric and luminescent properties in Sm-modified Bi_(0.5)Na_(0.5)TiO_(3)-BaTiO_(3) multifunctional ceramics

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Journal of Materiomics 2024年第4期10卷 803-810页

作者： Shuai Cheng Kehong zhang Chongyang Li Boping zhang Jianguo Chen Kang Sun Changrong zhou Jingtai Zhao Qisheng Lin Guanghui rao Siqi Shi School of Materials Science and Engineering Shanghai UniversityShanghai200444China Guangxi Key Laboratory of Information Materials&School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004GuangxiChina School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China School of Information Engineering Lanzhou University of Finance and EconomicsLanzhou730020China

The 0.93(Na_(0.5)Bi_(0.5))_(1–x)Sm_(x)TiO_(3)-0.07BaTiO_(3) multifunctional ceramics were prepared by solid-phase reaction *** phase structure,microstructure,electrical and photoluminescent properties were systematically *** increasing x,the ceramics undergoes the phase transition from rhombohedral to tetragonal with some rhombohedral distortion,along with a reduced grain size and increased relative *** the other hand,the Sm3+doping enhances the electric-field driven reversible phase transition and domain size,and reduces the domain walls,thereby contributing to improved piezoelectricity and decreased depolarization temperature(T_(d))from 91℃ to 40℃.Excellent piezoelectric properties of d_(33)=213 pC/N and kp=29.9% are achieved in the x=0.010 *** excitation(407 nm),the Sm^(3+)-doped ceramic exhibits bright reddish-orange fluorescence at 564,599,646 nm and 710 nm.A polarization-induced enhancement of photoluminescence is obtained in BNBT-_(x)Sm ceramics with an improved relative intensity of emission band at 646 *** results indicate that Sm^(3+)-doped BNBT ceramics show great potential in electro-optic integration and coupling device applications.

关键词： Piezoelectricity Curie temperature Phase transitions Thermal stability Photoluminescence

Direct detection of C9orf72 hexanucleotide repeat expansions by nanopore biosensor

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Chinese Chemical Letters 2024年第5期35卷 351-354页

作者： Xinqiong Li Guocheng rao Xi Peng Chan Yang Yanjing zhang Yan Tian Xianghui Fu Jia Geng State Key Laboratory of Biotherapy and Cancer Center West China HospitalSichuan University and Collaborative Innovation Center of BiotherapyChengdu 610041China Division of Endocrinology and Metabolism West China School of Medicine/West China HospitalSichuan UniversityChengdu 610041China Department of Endocrinology and Metabolism Affiliated Hospital of North Sichuan Medical CollegeNorth Sichuan Medical CollegeNanchong 637000China Division of Endocrinology and Metabolism National Clinical Research Center for GeriatricsState Key Laboratory of Biotherapy and Cancer CenterWest China HospitalSichuan University and Collaborative Innovation Center of BiotherapyChengdu 610041China Department of Laboratory Medicine State Key Laboratory of BiotherapyMed-X Center for ManufacturingWest China HospitalSichuan University and Collaborative Innovation CenterChengdu 610041China Tianfu Jincheng Laboratory City of Future MedicineChengdu 641400China

Diagnostic C9orf72 hexanucleotide repeat expansions(C9-HRE)is essential for the early and accurate diagnosis of amyotrophic lateral sclerosis(ALS)and will provide support for the prognosis and gene therapy of *** the present study,by combining catalytic hairpin assembly(CHA)with Mycobacterium smegmatis porin A(MspA)nanopore,a new nanopore-based strategy for the detection of C9-HRE was *** than 30 repeats of C9-HRE could be detected via this method,and the results have the potential to help distinguish between patients and healthy ***,the method demonstrated its great specificity for C9-HRE by identifying other repeat *** the high selectivity,this approach had been successfully used to detect C9-HRE in cell and blood samples with high *** detection strategy is user-friendly and has a strong anti-interference ability,thus providing a powerful tool for clinical diagnosis.

关键词： MspA nanopore C9orf72 HRE Detection Biosensor Catalytic hairpin assembly

MOFs‑Derived Strategy and Ternary Alloys Regulation in Flower‑Like Magnetic‑Carbon Microspheres with Broadband Electromagnetic Wave Absorption

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Nano-Micro Letters 2024年第11期16卷 479-493页

作者： Mengqiu Huang Bangxin Li Yuetong Qian Lei Wang Huibin zhang Chendi Yang Longjun rao Gang Zhou Chongyun Liang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Department of Chemistry Fudan UniversityShanghai 200438People’s Republic of China Materials Genome Institute Shanghai UniversityShanghai 200444People’s Republic of China School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 201418People’s Republic of China College of Physics Donghua UniversityShanghai 201620People’s Republic of China Zhejiang Laboratory Hangzhou 311100People’s Republic of China

Broadband electromagnetic(EM)wave absorption materials play an important role in military stealth and health ***,metal–organic frameworks(MOFs)-derived magnetic-carbon CoNiM@C(M=Cu,Zn,Fe,Mn)microspheres are fabricated,which exhibit flower-like nano–microstructure with tunable EM response *** on the MOFs-derived CoNi@C microsphere,the adjacent third element is introduced into magnetic CoNi alloy to enhance EM wave absorption *** term of broadband absorption,the order of efficient absorption bandwidth(EAB)value is Mn>Fe=Zn>Cu in the CoNiM@C ***,MOFs-derived flower-like CoNiMn@C microspheres hold outstanding broadband absorption and the EAB can reach up to 5.8 GHz(covering 12.2–18 GHz at 2.0 mm thickness).Besides,off-axis electron holography and computational simulations are applied to elucidate the inherent dielectric dissipation and magnetic *** heterointerfaces in CoNiMn@C promote the aggregation of the negative/positive charges at the contacting region,forming interfacial *** graphitized carbon layer catalyzed by the magnetic CoNiMn core offered the electron mobility path,boosting the conductive *** importantly,magnetic coupling is observed in the CoNiMn@C to strengthen the magnetic responding *** study provides a new guide to build broadband EM absorption by regulating the ternary magnetic alloy.

关键词： Magnetic-carbon microspheres MOFs derivatives Electromagnetic wave absorption Magnetic loss Broadband absorption