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Cagelike mesoporous silica encapsulated with microcapsules for immobilized laccase and 2,4-DCP degradation

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Journal of Environmental Sciences 2015年第12期27卷 52-62页

作者： Junya yang Yan huang Yuxiang yang hongming yuan Xiangnong Liu School of Chemistry and Molecular Engineering East China University of Science & Technology State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin University Analysis Test Center Yangzhou University

In this study,cage-like mesoporous silica was used as the carrier to immobilize laccase by a physical approach,followed by encapsulating with chitosan/alginate microcapsule membranes to form microcapsules of immobilized laccase based on layer-by-layer *** relationship between laccase activity recovery/leakage rate and the coating thickness was simultaneously *** the microcapsule layers have a substantial network of pores,they act as semipermeable membranes,while the laccase immobilized inside the microcapsules acts as a processing plant for degradation of2,*** microcapsules of immobilized laccase were able to degrade 2,4-dichlorophenol within a wide range of 2,4-dichlorophenol concentration,temperature and p h,with mean degradation rate around 62%.Under the optimal conditions,the thermal stability and reusability of immobilized laccase were shown to be improved significantly,as the removal rate and degradation rate remained over 40.2% and 33.8% respectively after 6 cycles of *** mass spectrometry（MS） and nuclear magnetic resonance（NMR）,diisobutyl phthalate and dibutyl phthalate were identified as the products of 2,4-dichlorophenol degradation by the microcapsules of immobilized laccase and laccase immobilized by a physical approach,respectively,further demonstrating the degradation mechanism of 2,4-dichlorophenol by microcapsule-immobilized laccase.

关键词： Laccase-cMSS mLbL-laccase 2,4-Dichlorophenol Degradation efficiency Reusability Degradation mechanism

Dynamic Simulation of a Novel Solar Polygeneration System for heat, Power and Fresh Water Production based on Solar Thermal Power Tower Plant

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Journal of Thermal Science 2020年第2期29卷 378-392页

作者： LI Xing WANG Zhifeng yang Ming yuan Guofeng Key Laboratory of Solar Thermal Energy and Photovoltaic System Chinese Academy of SciencesBeijing 100190China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Engineering Research Center of Solar Thermal Power Beijing 100190China

A novel solar polygeneration system for heat, power and fresh water production with absorption heat pump(AhP) and humidification-dehumidification(hDh) desalination system was proposed for high-efficiency utilization of solar energy. A case study of the proposed system was investigated based on 1 MW solar thermal power(STP) tower plant located in Beijing. Depending on mathematical modeling of the proposed system, corresponding modules were developed in TRNSYS. Meanwhile, control and operation strategies were fully studied with principal of solar energy cascade utilization. The thermodynamic performance of the proposed system was dynamically simulated at one minute intervals in a typical day. It was found that solar energy utilization level was improved with the help of solar thermal storage system and continuous heating in different operation modes met well with flexible heating loads from 93.76 kW to 169.49 kW. During AhP operation period, its Coefficient of Performance(COP) varied from 1.39 to 1.73 due to recoverable condensate heat restricted by heating demand. Meanwhile, fresh water production of hDh increased from 352.05 kg/h to 416.62 kg/h with Gained Output Ratio(GOR) increase from 2.48 to 2.67. Compared with original STP tower plant, maximum power generation efficiency was increased from 18.66% to 19.22% with power from 1169.69 kW to 1204.44 kW.

关键词： polygeneration solar thermal power dynamic simulation absorption heat pump humidification-dehumidification

Influence of contact layer on the sulphur corrosion of copper conductors in power transformers

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high Voltage 2022年第1期7卷 176-184页

作者： Lijun yang Dong Ding yuan yuan Sihang Gao Yuncai Lu State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqingChina College of Material Science and Engineering Chongqing UniversityChongqingChina Key Laboratory of Industrial Internet of Things and Networked Control Ministry of EducationChongqing University of Posts and TelecommunicationsChongqingChina State Grid Jiangsu Electric Power Co. Ltd.Electric Power Research InstituteNanjingChina

Owing to the corrosive sulphides in the mineral insulating oil such as dibenzyl disul-phide(DBDS),copper windings in oil‐immersed transformers may suffer sulphur *** study investigates the influence of different contact conditions on the corrosion of copper conductors in ***‐immersed accelerated corrosion experiment was conducted on copper conductors with various contact materials and different layers of insulating *** surface micromorphology,deposition compo-nent and the potentiodynamic polarization characteristics of copper conductors were *** results show that copper with different contact materials suffer sulphur corrosion;conversely,bare copper rarely *** was also verified that the existence of a particular gap between copper and contact layer is a significant factor in sulphur corrosion by the formation of a concentration cell on the copper *** insu-lating paper wrapped around copper conductors does not increase the corrosion ten-dency of copper;however,it contributes to the formation of a region concentrated with DBDS,Cu^(2+),h^(+)by adsorption and impediment,which plays a key role in facilitating the sulphur corrosion of copper ***,sulphur corrosion can also occur on other metal parts in transformers when there is a particular gap on surfaces other than copper.

关键词： corrosion copper sulphur

Anisotropic hardy-Lorentz spaces and their applications

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Science China Mathematics 2016年第9期59卷 1669-1720页

作者： LIU Jun yang DaChun yuan Wen School of Mathematical Sciences Beijing Normal University Laboratory of Mathematics and Complex Systems Ministry of Education

Let p ∈(0, 1], q ∈(0, ∞] and A be a general expansive matrix on Rn. We introduce the anisotropic hardy-Lorentz space h^(p,q)_A(R^n) associated with A via the non-tangential grand maximal function and then establish its various real-variable characterizations in terms of the atomic and the molecular decompositions, the radial and the non-tangential maximal functions, and the finite atomic decompositions. All these characterizations except the ∞-atomic characterization are new even for the classical isotropic hardy-Lorentz spaces on *** applications, we first prove that hp,q A(Rn) is an intermediate space between h^(p1,q1)_A(Rn) and h^(p2,q2)_A(R^n) with 0 h^(p,q1)_A(Rn) and h^(p,q2)_A(R^n) with p ∈(0, ∞)and 0 he real method of interpolation. We then establish a criterion on the boundedness of sublinear operators from h^(p,q)_A(R^n) into a quasi-Banach space; moreover, we obtain the boundedness of δ-type Calder′on-Zygmund operators from h^(p,∞)_A(R^n) to the weak Lebesgue space L^(p,∞)(R^n)(or to h^p_A(R^n)) in the ln λcritical case, from h^(p,q)_A(R^n) to L^(p,q)(R^n)(or to h^(p,q)_A(R^n)) with δ∈(0,(lnλ)/(ln b)], p ∈(1/(1+,δ),1] and q ∈(0, ∞], as well as the boundedness of some Calderon-Zygmund operators from h^(p,q)_A(R^n) to L^(p,∞)(R^n), where b := | det A|,λ_:= min{|λ| : λ∈σ(A)} and σ(A) denotes the set of all eigenvalues of A.

关键词： Lorentz space anisotropic hardy-Lorentz space expansive matrix Calder′on reproducing formula grand maximal function atom molecule Calder′on-Zygmund operator

Effective Application of IoT Power Electronics Technology and Power System Optimization Control

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TSINGhUA SCIENCE AND TEChNOLOGY 2024年第6期29卷 1763-1775页

作者： yang, Libo Ma, Bin yuan, Long Wu, Bingxiang State Grid hebei Elect Power Co Ltd Shijiazhuang 050000 Peoples R China State Grid Elect Power Res Inst Ltd NARI Grp Corp Nanjing 211000 Peoples R China

With the development of society, the power system plays an important role in the global energy structure. however, facing increasing energy demand and environmental pressure, improving power system efficiency, reducing costs, and ensuring reliability and safety have become key issues. The Internet of Things (IoT) power electronics technology, as one of the research hotspots, integrates IoT and power electronics technology to achieve intelligent and optimized control of power systems through sensors, communication, and control technologies. In order to meet current and future needs, it is necessary to optimize the operation and management of power systems using IoT power electronics technology. By analyzing the application of Internet of Things power electronics technology and the optimal dispatch of power systems, support vector machine algorithms are used to analyze and process equipment data, and perform data monitoring and anomaly detection to promote energy waste reduction and energy saving, and then start from operation and maintenance respectively. Comparative simulation experiments were conducted in five aspects: efficiency, effectiveness of power load prediction and optimization control, effectiveness of intelligent monitoring, operating costs, and data security. The experimental results show that the operation and maintenance efficiency of the power system using IoT power electronics technology has been improved to only 18 h for equipment fault handling. The accuracy of load forecasting optimization control based on IoT power electronics technology reaches 94%. The fault detection accuracy of intelligent monitoring of power equipment based on the power electronics technology of the Internet of Things has reached 96%. At the same time, the Internet of Things power electronics technology was used to improve the power operation mode, so as to promote the monthly electricity sales revenue of 2.77 million RMB. In addition, the effectiveness of IoT power electron

关键词： power system power electronics technology Internet of Things optimized control support vector machine

Nickel cobalt phosphide with three-dimensional nanostructure as al highly efficient electrocatalyst for hydrogen evolution reaction in both I acidic and alkaline electrolytes

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Nano Research 2019年第2期12卷 375-380页

作者： Bo Ma Zhengchun yang Yantao Chen Zhihao yuan Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384 China School of Electrical and Electronic Engineering Tianjin Key Laboratory of Film Electronic & Communication Devices Tianjin University of Technology Tianjin 300384 China

Transition metal phosphides (TMPs) are promising candidates for noble metal free electrocatalysts in water splitting applicati ons. In this work, we prese nt the facile syn thesis of nickel cobalt phosphide electrocatalyst with three-dime nsional nano structure (3D-NiCoP) on the nickel foam, via hydrothermal reaction and phosphorization. The as-prepared electrocatalyst exhibits an excellent activity for hydrogen evolution reaction (hER) in both acidic and alkaline electrolytes, with small overpotentials to drive 10 mA/cm^2 (80 mV for 0.5 M h2SO4, 105 mV for 1 M KOh), small Tafel slopes (37 mV/dec for 0.5 M h2SO4, 79 mV/dec for 1 M KOh), and satisfying durability in long-term electrolysis. 3D-NiCoP also shows a superior hER activity compared to single metal phosphide, such as cobalt phosphide and nickel phosphide. The outstanding performa nee for hER suggests the great pote ntial of 3D-NiCoP as a highly efficient electrocatalyst for water splitting technology.

关键词： nickel cobalt phosphide water splitting hydrogen evolution reaction electrocatalyst

Effects of Ni Content and Ball Milling Time on the hydrogen Storage Thermodynamics and Kinetics Performances of La–Mg–Ni Ternary Alloys

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Acta Metallurgica Sinica(English Letters) 2019年第8期32卷 961-971页

作者： Zhen-yang Li Sheng-Li Li Ze-Ming yuan yang-huan Zhang School of Materials Science and Engineering Shandong UniversityJinan 250061China Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China

The eifects of Ni content and ball milling time on the hydrogen storage thermodynamics and kinetics performances of asmilled La5Mg95-xNix(x=5,10,15)ternary alloys have been *** evolution of microstructure and phase of experimental alloys in the absorption/desorption process has been characterized by XRD,SEM and *** hydrogen storage kinetics and thermodynamics performances and PCI curves have been tested using the Sievert *** is found that the rising of Ni content remarkably improves the hydrogen storage kinetic performance,but reduces hydrogen storage *** with the increase in milling time,hydrogen desorption activation(Ea)value decreases firstly and then increases;the minimum value is 47.6 kJ/mol,and the corresponding milling time is 10 h for La5Mg85Ni10 *** for the thermodynamics properties,the hydrogenation enthalpy(△h)and hydrogenation entropy(△S)both decrease firstly and then increase with the rising of Ni content and milling *** composite La5Mg85Ni10 alloy milled for 10 h exhibits the best thermodynamics and kinetics performances,the lowest Ea of 47.6 kJ/mol,absorption of 5.4 wt.%within 5 min and desorption of 5.2 wt.%within 3 min at 360℃and the lowest△h and△S of 72.1 kJ/mol and 123.2 J/mol/K.

关键词： hydrogen storage Mg-based alloys Thermodynamics and kinetics Ni content Milling time

Study on the mechanical activation of malachite and the leaching of complex copper ore in the Luanshya mining area, Zambia

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 292-300页

作者： Gai-rong Wang hong-ying yang yuan-yuan Liu Lin-lin Tong Ali Auwalu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China CNMC Luanshya Copper Mines Plc(CLM) Independence AvenueLuanshya City 90456Zambia

Mechanical activation(MA) of malachite was carried out by dry planetary grinding(DPG) and wet Isa grinding(WIG) methods. When the rotational speed was increased to 400 r/min in DPG, the specific surface area of malachite reached the maximum and the particle size reached the minimum of 0.7–100 μm. Agglomeration occurred between mineral particles when the rotational speed was increased to 580 r/min in ***, no agglomeration was observed among particles with sizes 0.4–3 μm in WIG. X-ray diffraction analysis showed that, at a 580 r/min rotational speed in DPG, the amorphization degree of malachite was 53.12%, whereas that in WIG was 71.40%, indicating that MA led to amorphization and distortion of crystal structures. In addition, in the Fourier transform infrared(FT-IR) spectra of activated malachite, the bands associated with –Oh, CO_3^(2-)and metal lattice vibrations of Cu–O and Cu–Oh were weakened, and a new h–O–h bending mode and peaks of gaseous CO_2 appeared, indicating that MA decreased the band energy, enhanced dihydroxylation, and increased the chemical reactivity of the ***, the leaching behavior of copper ore was greatly improved by MA.

关键词： malachite mechanical activation crystal structure copper ore Zambia

The compound(E)-2-(3,4-dihydroxystyryl)-3-hydroxy-4h-pyran-4-one alleviates neuroinflammation and cognitive impairment in a mouse model of Alzheimer's disease

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Neural Regeneration Research 2025年第11期20卷 3330-3344页

作者： Xueyan Liu Wei Wu Xuejuan Li Chengyan Wang Ke Chai Fanru yuan huijuan Zheng Yuxing Yao Chenlu Li Zu-Cheng Ye Daijun Zha Department of Medicinal Chemistry School of PharmacyFujian Medical UniversityFuzhouFujian ProvinceChina Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases School of Basic Medical SciencesFujian Medical UniversityFuzhouFujian ProvinceChina Institute of Laboratory Animal Center Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Neurosurgery Neurosurgery Research InstituteThe First Affiliated HospitalFujian Medical UniversityFuzhouFujian ProvinceChina Department of hyperbaric Oxygen National Regional Medical CenterBinhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouFujian ProvinceChina

Previous studies have shown that the compound(E)-2-(3,4-dihydroxystyryl)-3-hydroxy-4h-pyran-4-one(D30),a pyromeconic acid derivative,possesses antioxidant and anti-inflammatory properties,inhibits amyloid-β aggregation,and alleviates scopolamine-induced cognitive impairment,similar to the phase Ⅲ clinical drug *** this study,we established a mouse model of Alzheimer's disease via intracerebroventricular injection of fibrillar amyloid-β to investigate the effect of D30 on fibrillar amyloid-β-induced *** results showed that D30 alleviated fibrillar amyloid-β-induced cognitive impairment,promoted fibrillar amyloid-β clearance from the hippocampus and cortex,suppressed oxidative stress,and inhibited activation of microglia and astrocytes.D30 also reversed the fibrillar amyloid-β-induced loss of dendritic spines and synaptic protein ***,we demonstrated that exogenous fibrillar amyloid-βintroduced by intracerebroventricular injection greatly increased galectin-3 expression levels in the brain,and this increase was blocked by *** the role of D30 in clearing amyloid-β,inhibiting neuroinflammation,protecting synapses,and improving cognition,this study highlights the potential of galectin-3 as a promising treatment target for patients with Alzheimer's disease.

关键词： Alzheimer's disease amyloid-β astrocyte cognitive impairment D30 dendritic spines galectin-3 microglia neuroinflammation neuron