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Frontiers of Chemical Science and Engineering 2023年第7期17卷 867-879页

作者： Wei Zhang Runtang Liu xu Yang Binbin nian Yi Hu State Key Laboratory of Materials-Oriented Chemical Engineering School of Pharmaceutical SciencesNanjing Tech UniversityNanjing 210009China

Polydopamine-functionalized nanosilica was synthesized using an inexpensive and easily obtainable raw material,mild reaction conditions,and simple ***,a flexible spacer arm was introduced by using dialdehyde starch as a cross-linking agent to bind with laccase.A high loading amount(77.8 mg∙g^(‒1))and activity retention(75.5%)could be achieved under the optimum immobilization *** parameters showed that the immobilized laccase had a lower thermal deactivation rate constant and longer *** enhancement of thermodynamic parameters indicated that the immobilized laccase had better thermal stability than free *** residual activity of immobilized laccase remained at about 50.0%after 30 days,which was 4.0 times that of free *** laccase demonstrated excellent removal of phenolic pollutants(2,4-dichlorophenol,bisphenol A,phenol,and 4-chlorophenol)and perfect reusability with 70% removal efficiency retention for 2,4-dichlorophenol after seven *** results suggested that immobilized laccase possessed great reusability,improved thermal stability,and excellent storage ***–inorganic nanomaterials have a good application prospect for laccase immobilization,and the immobilized laccase of this work may provide a practical application for the removal of phenolic pollutants.

关键词： polydopamine pollutant removal thermodynamic phenolic pollutants immobilized laccase

Plasmonic Cu_(27)S_(24)nanocages for novel solar photothermal nanoink and nanofilm

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Nano Research 2022年第4期15卷 3161-3169页

作者： Min Xi Longchang xu nian Li Shudong Zhang Zhenyang Wang Institute of Solid State Physics and Key Laboratory of Photovoltaic and Energy Conservation Materials Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China The Key Laboratory Functional Molecular Solids Ministry of Education Anhui Normal UniversityWuhu 241002China School of Mechatronics and Vehicle Engineering Chongqing Jiaotong UniversityChongqing 400074China

Copper sulfide(Cu_(x)S)as a plasmonic solar photothermal semiconductor material that expands the light collection range by altering localized surface plasmon resonance(LSPR)to the near-to mid-infrared(IR)spectral *** versatile synthesis strategies of Cu_(x)S nanostructure offer its variability of morphology and provide additional freedom in tuning the optical ***,nanocage(or nanoshell)has hybridized plasmon resonances as a result of super-positioned nanosphere and nanocavity,which extends its receiving range of solar spectrum and increases light-to-heat conversion ***,we offer novel“nanoink”and“nanofilm”developed from colloidal Cu_(27)S_(24)nanocages with excellent solar photothermal *** combining experimental measurement and theoretical calculation,we estimated the optical properties of covellite Cu_(27)S_(24).And based on obtained dielectric functions,we then calculated its solar photothermal performance,which was further validated by our experimental *** simulation results showed that hollow Cu_(27)S_(24)nanocages have excellent solar photothermal performance,and exhibit much higher solar photothermal conversion efficiency than solid Cu_(27)S_(24)nanospheres.

关键词： plasmonics solar photothermal hybridized plasmon Cu_(27)S_(24)nanocages

An Approximation for Rapid Simulation of Thin-Film Bulk Acoustic Resonators(FBARs)with Sandwich-Layered Structure

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Acta Mechanica Solida Sinica 2023年第2期36卷 293-305页

作者： Haoyu Huang Yibo Ge Xiangrong xu nian Li Zhenghua Qian AVIC Jincheng Nanjing Engineering Institute of Aircraft Systems Nanjing 210016China State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

Thin-film bulk acoustic resonators(FBARs)operating with essentially thickness-extensional mode have been widely used in communication *** this paper,we provide a convenient means for analyzing FBARs with sandwich-layered structure by appropriately neglecting the high-order terms from 3D elasticity ***,for straight-crested waves,an approximate method is proposed,which can accurately describe the dispersion relation near the operating frequency range of an *** the approximation,the optimum lateral size of a 2D model of frame-like FBAR is obtained,and the results are in good agreement with that obtained by commercial FEM software *** approximation is further extended to variablecrested waves in order to analyze the 3D plate models for real *** mode shapes of 3D FBARs with and without frame-like structures are *** results show that the approximation presented in this paper is of sufficient accuracy and can be used as an efficient tool for the analysis and design of FBARs.

关键词： Two-dimensional scalar differential equations FBAR COMSOL Layered structure

Dynamic Analysis of Bubble Attachment and Sweeping on Microwire in Subcooled Nucleate Pool Boiling

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Journal of Thermal Science 2021年第5期30卷 1842-1858页

作者： xu nian JIANG Hantao PENG Licheng WANG Dongdong CHU Huaqiang School of Energy and Environment Anhui University of TechnologyMa'anshan 243002China College of Ecology and Environment Hainan UniversityHaikou 570228China Engineering Technology Research Center of Energy Saving&Pollutant Control in Metallurgical Process Anhui University of TechnologyMa'anshan 243002China

With the development of industrial technology,heat transfer at the microscale has attracted more and more *** this work,200μm platinum wire and 150μm nickel-chromium wire were used as experimental objects,which the power was provided by DC power with the range of 15.6 W to 56.2 *** water was used as the experimental *** bubbles on the micro wire were observed and the heat mechanism was analyzed.A variety of bubble attachment phenomena were captured on the 200μm platinum wire,including the adhesion during bubble detachment,the rotation of small attached bubbles on the surface of large bubble,multiple bubbles circling at the top of the same bubble,and different attached bubble departure *** force in the vertical direction triggered the formation of bubble *** addition,the effects of surface tension,adhesion force and buoyancy force on the circling of the bubble were also *** analysis of the bubble sweeping on the 150μm nickel-chromium wire was *** results showed that the static bubble would interact with the sweeping bubbles on the other side,thereby changing the heat transfer mechanism,which was not discussed in detail *** bubble jet flow generated by thermocapillary convection on the vertical direction of the bubble surface was the main influencing factor,which would change the microlayer encountered in front of the *** effects of bubble diameter and liquid subcooling on the sweeping velocity were also *** results showed that the larger the bubble diameter was,the lower the sweeping velocity would be achieved while the liquid subcooling temperature had less impact on the velocity of sweeping bubble.

关键词： nucleate boiling attachment sweeping Marangoni force

Preparation and MRI performances of core-shell structural PEG salicylic acid-gadolinium composite nanoparticles

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Journal of Rare Earths 2022年第7期40卷 1098-1105页

作者： Jia Zhang Zhiyan Lin Minzhi Zhao Weibing xu Fang nian College of Science Gansu Agricultural UniversityLanzhou 730000China Clinical Medical College Gansu University of Chinese MedicineLanzhou 730000China

Gadolinium(Ⅲ)-based T_(1) contrast agents have been widely used in clinical *** this study,salicylic acid-gadolinium chelate was prepared via directly coordination reaction of gadolinium ion and salicylic ***,three polyethylene glycols with different molecular weight were modified on the surface of salicylic acid-gadolinium by simple chemical coupling to construct three core-shell structural Gd based *** scanning electron microscopy(SEM)and transmission electron microscopy(TEM)characterization results show that the composite is a spherical particle with a diameter of about 100-200 *** longitudinal relaxation rate r_(1) of the Gal-PEG-2000 is 11.097(mmol/L)^(-1)/s,and the ratio of r_(2)/r_(1) is as low as *** composite shows good liver and intestines MRI performances after being used in in vivo imaging,showing a good prospect of biological application.

关键词： Gadolinium Salicylic acid Polyethylene glycols Core-shell structural MRI contrast agent Rare earths

Measurements of argon metastable density using the tunable diode laser absorption spectroscopy in Ar and Ar/O2

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Chinese Physics B 2018年第6期27卷 298-306页

作者： Dao-Man Han Yong-Xin Liu Fei Gao Wen-Yao Liu Jun xu you-nian Wang Key Laboratory of Materials Modification by Laser Ion and Electron Beams （Ministry of Education） School of Physics Dalian University of Technology Dalian 116024 China National Demonstration Center for Experimental Physics Education Dalian University of Technology Dalian 116024 China

Densities of Ar metastable states 1s5 and 1s3 are measured by using the tunable diode laser absorption spectroscopy（TDLAS） in Ar and Ar/O2 mixture dual-frequency capacitively coupled plasma（DF-CCP）. We investigate the effects of high-frequency（HF, 60 MHz） power, low-frequency（LF, 2 MHz） power, and working pressure on the density of Ar metastable states for three different gas components（0%, 5%, and 10% oxygen mixed in argon）. The dependence of Ar metastable state density on the oxygen content is also studied at different working pressures. It is found that densities of Ar metastable states in discharges with different gas components exhibit different behaviors as HF power increases. With the increase of HF power, the metastable density increases rapidly at the initial stage, and then tends to be saturated at a higher HF power. With a small fraction（5% or 10%） of oxygen added in argon plasma, a similar change of the Ar metastable density with HF power can be observed, but the metastable density is saturated at a higher HF power than in the pure argon discharge. In the DF-CCP, the metastable density is found to be higher than in a single frequency discharge, and has weak dependence on LF power. As working pressure increases, the metastable state density first increases and then decreases,and the pressure value, at which the density maximum occurs, decreases with oxygen content increasing. Besides, adding a small fraction of oxygen into argon plasma will significantly dwindle the metastable state density as a result of quenching loss by oxygen molecules.

关键词： argon metastable states tunable diode laser absorption spectroscopy capacitively coupled plasmas

Using Landsat TM Imagery to Detect Desertification in Gonghe Basin at the Upper Reaches of the Yellow River

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Journal of China University of Mining and Technology 2006年第3期16卷 287-291页

作者： xu Huo ZENG Yong-nian North China Institute of Science and Technology East Yanjiao Beijing 101601 China School of Geography Science South China Normal University Guangzhou Guangdong 510631 China

In recent years, the ecological environment in the upper reaches of the Yellow River has been degraded due to natural and human factors. Environmental problems such as grassland degeneration, sandy desertification and water erosion have seriously affected regional economic sustainable development. The objective of this paper was to detect sandy desertification in the upper reaches of the Yellow River by means of remote sensing and GIS. The Gonghe Basin was chosen as the study site, which is one of the most seriously degraded regions in the area. Based on an analysis of the multi-temporal and multi-spectral Landsat TM data with GIS, sandy desertification processes were detected. The results show that sandy desertified land has increased and intensified seriously in the upper reaches of the Yellow River for the period from 1987 to 1996. There are two desertification processes at work in the study area: sand dune reactivation and development of badlands through wind erosion. Excessive human activities play an important role in the occurrence and development of desertification in this area. At present, acceleration of the desertification process is attributed to irrational human economic activities. Grasslands as well as the ecological environment of this area have been seriously degraded, which has affected the regional economic sustainable development and endangered the security of the Longyangxia reservoir. It is necessary and urgent to combat desertification and protect the environment. The results show that full use of remote sensing data with GIS in monitoring and assessing desertification is an effective measure of quantitative research.

关键词： sandy desertification detection remote sensing GIS Gonghe Basin

《黄帝内经》五色概念在茶包装设计中的融入和体现

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绿色包装 2024年第9期 121-124,129页

作者：徐念倪檬余孟杰湖北大学艺术学院湖北武汉430000

基于《黄帝内经》五色概念,设计一款受众为年轻群体的养生茶包装。主要对五色概念、养生之道,以及茶包装创意设计进行分析与阐释,以期在弘扬健康养生之道的同时体现包装设计的创意性。

关键词：黄帝内经茶叶包装创意设计绿色设计

Global Exponential Convergence Analysis of Hopfield Neural Networks with Continuously Distributed Delays

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Communications in Theoretical Physics 2003年第3期39卷 381-384页

作者： Zhang Qiang Ma Run-nian xu Jin Institute of Electronic Engineering Xidian University Xi'an 710071 China Institute of System Science Huazhong University of Science and Technology Wuhan 430074 China

A model of Hopfield neural networks with continuously distributed delays is considered. A new sufficient condition which guarantees global exponential stability of an equilibrium point is given based on Lyapunov functional approach and inequality technique. Compared with the previous results, our result provides a wider range since it possesses many adjustable parameters.

关键词： Hopfield人工神经网络整体指数收敛分布延迟

透水NaA分子筛膜强化的CO_(2)加氢高效制甲醇

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化工进展 2024年第5期43卷 2834-2842页

作者：李海鹏吴桐王琪郜时旺王晓龙李旭高新华年佩魏逸彬中国华能集团清洁能源技术研究院有限公司北京102209 宁夏大学化学化工学院省部共建煤炭高效利用与绿色化工国家重点实验室宁夏银川750021 高效灵活煤电及碳捕集利用封存全国重点实验室北京100031 二氧化碳捕集与处理北京市重点实验室北京102209

近年来,利用可再生能源产生的绿氢与CO_(2)反应制备甲醇备受关注。然而,由于CO_(2)催化加氢反应受热力学平衡限制,CO_(2)的转化率与甲醇选择性较低;另外,副产物水易导致催化剂失活。本研究采用母液晶种法在α-Al_(2)O_(3)膜管外制备了... 详细信息

近年来,利用可再生能源产生的绿氢与CO_(2)反应制备甲醇备受关注。然而,由于CO_(2)催化加氢反应受热力学平衡限制,CO_(2)的转化率与甲醇选择性较低;另外,副产物水易导致催化剂失活。本研究采用母液晶种法在α-Al_(2)O_(3)膜管外制备了无缺陷的单通道NaA分子筛外膜,通过在膜管外填充Cu基催化剂,构建了一种分子筛膜-催化剂反应分离双功能反应体系,以同时实现CO_(2)加氢生成甲醇和在线选择性除水。通过XRD、SEM、N_(2)等温吸附-脱附、H_(2)-TPR表征技术对NaA分子筛膜和催化剂进行理化性质表征,并在膜反应器上对催化剂的CO_(2)催化加氢性能进行评价。结果表明,与传统固定床反应器对比,本反应体系可有效拉动反应平衡,大幅提高CO_(2)转化率。在250℃、3MPa条件下,CO_(2)转化率由3.34%提高至28.78%,甲醇收率由3.28%提高至27.62%。

关键词：二氧化碳加氢甲醇 Cu基催化剂膜反应器