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International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1153-1163页

作者： xiao-min You xue-feng she Jing-song Wang Qing-guo xue Ze-yi Jiang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China

CaO-containing carbon pellets(CCCP)were successfully prepared from well-mixed coking coal(CC)and calcium oxide(CaO)and roasted at different pyrolysis *** effects of temperature,pore distribution,and carbon structure on the compressive strength of CCCP was investigated in a pyrolysis furnace(350-750℃).The results showed that as the roasting temperature increased,the compressive strength also increased and furthermore,structural defects and imperfections in the carbon crystallites were gradually eliminated to form more organized char structures,thus forming high-ordered ***,the CCCP preheated at 750℃exhibited the highest compressive strength.A positive relationship between the compressive strength and pore-size homogeneity was established.A linear relationship between the com-pressive strength of the CCCP and the average stack height of CC was ***,a four-stage caking mechanism was developed.

关键词： calcium oxide-containing carbon pellets calcium carbide coking coal compressive strength pyrolysis furnace

Bioelectrochemical acidolysis of magnesia to induce struvite crystallization for recovering phosphorus from aqueous solution

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Journal of Environmental Sciences 2019年第11期31卷 119-128页

作者： Zuobin Wang Jiao Zhang xiao guan Lu she Pengyu xiang Siqing xia Zhiqiang Zhang Key Laboratory of Yangtze River Water Environment Ministry of Education State Key Laboratory of Pollution Control and Resource ReuseCollege of Environmental Science and Engineering Tongji University Shanghai 200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China School of Civil and Transportation Engineering Shanghai Urban Construction Vocational College Shanghai 200432 China Zhejiang Weiming Environment Protection Co. Ltd. Wenzhou 325000 China

A novel struvite crystallization method induced by bioelectrochemical acidolysis of magnesia (MgO) was investigated to recover phosphorus (P) from aqueous solution using a dual-chamber microbial electrolysis cell (dMEC).Magnesium ion (Mg2+) in the anolyte was firstly confirmed to automatically migrate from the anode chamber to the cathode chamber,and then react with ammonium (NH4+) and phosphate (PO34-) in the catholyte to form *** efficiency of 17.8%-60.2% was obtained with the various N/P ratios in the *** MgO (low solubility under alkali conditions) was added into the anolyte,the bioelectrochemical acidolysis of MgO naturally took place and the released Mg2+ induced struvite crystallization in the cathode chamber for P recovery ***,there was a strong linear positive correlation between the recovery efficiency and the MgO dosage (R2 =0.935),applied voltage (R2 =0.969) and N/P ratio (R2 =0.905).Increasing the applied voltage was found to enhance the P recovery via promoting the MgO acidolysis and the released Mg2+ migration,while increasing the N/P ratio in the catholyte enhanced the P recovery via promoting the struvite ***,the electrochemical performance of the system was promoted due to more stable anolyte pH and lower pH gradient between the two *** density was promoted by 10%,while the COd removal efficiency was improved from 78.2% to 91.8% in the anode chamber.

关键词： Phosphorus Struvite Microbial electrolysis cell Magnesia Acidolysis Migration

design of Intelligent Mosquito Nets Based on deep Learning Algorithms

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Computers, Materials & Continua 2021年第11期69卷 2261-2276页

作者： Yuzhen Liu xiaoliang Wang xinghui she Ming Yi Yuelong Li Frank Jiang Hunan University of Science and Technology Xiangtan411201China School of Info Technology Deakin UniversityGeelong3215Australia Key Laboratory of Knowledge Processing and Networked Manufacturing College of Hunan Province411201China

An intelligent mosquito net employing deep learning has been one of the hotspots in the field of Internet of Things as it can reduce significantly the spread of pathogens carried by mosquitoes,and help people live well in mosquito-infested *** this study,we propose an intelligent mosquito net that can produce and transmit data through the Internet of Medical *** our method,decision-making is controlled by a deep learning model,and the proposed method uses infrared sensors and an array of pressure sensors to collect *** the ZigBee protocol is used to transmit the pressure map which is formed by pressure sensors with the deep learning perception model,determining automatically the intention of the user to open or close the mosquito *** used optical flow to extract pressure map features,and they were fed to a 3-dimensional convolutional neural network(3d-CNN)classification model *** achieved the expected results using a nested cross-validation method to evaluate our *** learning has better adaptability than the traditional methods and also has better anti-interference by the different bodies of *** research has the potential to be used in intelligent medical protection and large-scale sensor array perception of the environment.

关键词： Internet of things smart home ZigBee protocol internet of medical things deep learning

Synthesis, Crystal Structure and Optical Properties of Europium Trifluoroacetate Complexes with 1,10-Phenanthroline and 2,2＇-Bipyridine

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Chinese Journal of Chemistry 2011年第2期29卷 267-272页

作者： she Jiangbo Cui xiaoxia Hou Chaoqi gao Chao Wei Wei Peng Bo State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chi- nese Academy of Science (CAS) Xi'an Shaanxi 710119 China Institute of Advanced Materials Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China

Two europium trifluoroacetate complexes, Eu（CF3COO）*** （1） and Eu（CF3COO）3·bpy （2）（where phen= 1,10-phenanthroline, bpy=2,2＇-bipyridine）, were synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy （FT-IR）, photoluminescence （PL） spectroscopy and thermogravimetric analysis （TA）. Single-crystal x-ray structure has been determined for the complex [Eu2（CF3COO）6·（phen）3·（H2O）2]·EtOH. The crystal structure of [Eu2（CF3COO）6·（phen）3·（H2O）2]·EtOH shows that two different coordination styles with europium ions coexist in the same crystal and have entirely different coordination geometries and numbers. This crystal can be considered as an 1 ： 1 adduct of [Eu（CF3COO）3·（Phen）2·H2O]·EtOH （9-coordination part） and Eu（CF3COO）3·phen·H2O （8-coordination part）. The excitation spectra of the two complexes demonstrate that the energy collected by ＂antenna ligands＂ is transferred to Eu3＋ ions efficiently. The room-temperature PL spectra of the complexes are composed of the typical Eu3＋ ions red emission, due to transitions between 5d0→7FJ（J=0→4）. The lifetimes of 5d0 of Eu3＋ in the complexes were examined using time-resolved spectroscopic analysis, and the life- time values of Eu（CF3COO）3·phen and Eu（CF3COO）3·bpy were fitting with bi-exponential （2987 and 353 us） and monoexponential （3191 us） curves, respectively. In order to elucidate the energy transfer process of the europium complexes, the energy levels of the relevant electronic states had been estimated. The thermal analyses indicate that they are all quite stable to heat.

关键词： europium complex luminescent property Judd-Ofelt theory thermal decomposition structure elucidation lanthanides

Rigid chelating dicarbene ligands based on naphthyridine-fused bisimidazolium salts

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Chinese Chemical Letters 2022年第6期33卷 2993-2996页

作者： Yan Liu Zhijie she Qinze Zheng xuesong Zheng Tianbao Wang ge gao Key Laboratory of green Chemistry and Technology of Ministry of Education College of ChemistrySichuan UniversityChengdu610064China

Naphthyridine-fused bisimidazolium salts were designed and synthesized for the first time. The study of the Cu(Ⅱ) and Pd(Ⅱ) complexes demonstrated that the deprotonated dicarbene ligands are rigid chelating C,C-liga... 详细信息

关键词： NHC dicarbene ligand Naphthyridine Phenanthroline

Boundary layer structure in turbulent rayleigh-bénard convection in a slim box

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Acta Mechanica Sinica 2019年第4期35卷 713-728页

作者： Hong-Yue Zou Wen-Feng Zhou xi Chen Yun Bao Jun Chen Zhen-Su she State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science College of Engineering Peking University Beijing 100871 China department of Mechanics College of Engineering Sun Yat-sen University Guangzhou 510275 China

Logarithmic boundary layers have been observed in different regions in turbulence. However, how thermal plumes correlate to the log law of temperature and how the velocity profile changes with pressure gradient are not fully understood. Here, we perform three-dimensional simulations of turbulence in a slim-box without the front and back walls with aspect ratio, width:depth:height=L:d:H=1:1/6:1width:depth:height=L:d:H=1:1/6:1 (respectively corresponding to xx, yy and zz coordinates), in the Rayleigh number Ra=[1×10^8,1×10^10]Ra=[1×10^8,1×10^10] for Prandtl number Pr=0.7Pr=0.7. To investigate the structures of the viscous and thermal boundary layers, we examine the velocity profiles in the streamwise and vertical directions (i.e. UU and WW) along with the mean temperature profile throughout the plume-impacting, plume-ejecting, and wind-shearing regions. The velocity profile is successfully quantified by a two-layer function of a stress length, e^+u=e^+0(z^+)3/2[1+(z^+/z^+sub)4]^1/4eu+=e^+0(z+)3/2[1+(z+/zsub+)4]1/4, as proposed by she et al.(J Fluid Mech, 2017), though it is neither \pb type nor logarithmic. In contrast, the temperature profile in the plume-ejecting region is logarithmic for all simulated cases, being attributed to the emission of thermal plumes. The coefficient of the temperature log-law, AA, can be described by composition of the thermal stress length ■■θ0■θ0■ and the thicknesses of thermal boundary layer z■subzsub■ and z?bufzbuf■, i.e. A■z?sub/(■■θ0z■buf3/2)A■zsub?/(■θ0■zbuf^3/2). The adverse pressure gradient responsible for turning the wind direction contributes to intensively emitting plumes and the logarithmic temperature profile at the plume-ejecting region. The Nusselt number scaling and the local heat flux in the slim box are consistent with previous results of the confined cells. Therefore, the slim-box RBC is a preferable system for investigating in-box kinetic and thermal structures of turbulent convection with the large-scale circulation

关键词： Rayleigh-Bénard convection Wall-bounded turbulence Heat transport direct numerical simulation

Influence of geological factors on coal permeability in the Sihe coal mine

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International Journal of Coal Science & Technology 2022年第1期9卷 58-70页

作者： guangui Zou Qianhua Zhang Suping Peng Jiasheng she deliang Teng Chaochao Jin Yuyan Che State Key Laboratory of Coal Resources and Safe Mining BeijingChina College of geoscience and Surveying Engineering China University of Mining&TechnologyBeijingChina

Permeability of coal reservoirs influence the extraction of coal gas from coal *** coal samples were collected at an anticline and a syncline of the No.3 coal seam in the Sihe coal ***,permeability,pore size,vitrinite reflectance,and liquid nitrogen adsorption of the samples were *** curvatures at the sample locations,and the distance between the sampling locations and the nearest faults were calculated based on seismic *** influences of the evaluated parameters on permeability were *** factors that influence permeability of the No.3 coal seam were extracted using principal component analysis(PCA).Based on the porosity–permeability model derived from the Archie formula and classic Kozeny–Carman equation,we deduced that the permeability of coal increased with an increase in *** an increase in average vitrinite reflectance,permeability decreases first and then *** results showed that coal permeability was regulated by three key components representing three *** first component included pore size,depth,and pore complexity accounting for 52.59%of the variability indicating that it was the most important in controlling *** second component included specific surface area,structural curvature,and porosity,and the third component comprised of specific surface area,porosity,and average vitrinite ***,pore diameter and complexity had significant effects on coal *** results show that researchers and stakeholders must consider the interactions among multiple factors rather than single factors to understand the influences on permeability to facilitate efficient utilization of coalbed methane resources.

关键词： Coal mine Permeability geological factors Principal component analysis

Tartary buckwheat(Fagopyrum tataricum(L.)gaertn)protein-derived antioxidant peptides:mechanisms of action and structure-activity relationship in Caco-2 cell models

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Food Science and Human Wellness 2022年第6期11卷 1580-1590页

作者： Yiming Zhou xuanming she Zhidong Chen Yun Wei Ying xiao xiaoli Zhou School of Perfume and Aroma Technology Shanghai Institute of TechnologyShanghai 201418China University Think Tank of Shanghai Municipality Institute of Beautiful China and Ecological CivilizationShanghai 201418China

Excessive reactive oxygen species(ROS)can cause oxidative damage and lead to various metabolic *** buckwheat(Fagopyrum tataricum(L.)gaertn)is a new kind of protein-rich functional food,the protein in which has been proved to have good antioxidant *** this study,in order to further explore the antioxidant mechanism of Tartary buckwheat protein,4 peptides(CR-8,LR-8,gK-10 and SR-12)were isolated and identified from it.H2 O2 was used to induce oxidative damage to Caco-2 cells to evaluate antioxidant capacity of these *** results of superoxide dismutase(SOd),total antioxidant capacity(T-AOC)and mitochondrial membrane potential *** that these peptides have superior antioxidant ***-8 has the best antioxidant *** order to further clarify the antioxidant mechanism of CR-8,metabolomics was used to analyze related metabolites and metabolic *** results showed that after CR-8 intervention,the content of metabolites such as L-acetyl carnitine has *** indicated that CR-8 can improve the antioxidant capacity of damaged cells by intervening in multiple metabolic *** also revealed the anti-oxidant mechanism of tartary buckwheat *** conclusion,it provided a theoretical basis for further studying the activity of tartary buckwheat portein and utilizing buckwheat resources.

关键词： Antioxidant protective Tartary buckwheat peptides Metabolic mechanim Caco-2 cells

Observation and analysis of positive leader re-illumination in a 10 m ultra-high voltage transmission line gap under switching impulse voltages

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Plasma Science and Technology 2024年第10期26卷 93-100页

作者： Biao HUANg xuan ZHOU she WANg Chijie ZHUANg Rong ZENg Le dENg Eliet Engineering School Changsha University of Science&TechnologyChangsha 410114People’s Republic of China State Key Laboratory of disaster Prevention&Reduction for Power grid Changsha University of Science&TechnologyChangsha 410114People’s Republic of China China International Engineering Consulting Co. Ltd.Beijing 100048People’s Republic of China department of Electrical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China

The leader propagation is one of the most important stages in long air gap *** mechanism behind leader re-illumination remains *** high humidity conditions(20.0–30.1 g/m^(3)),we have conducted experiments of long sparks in a 10 m ultra-high voltage(UHV)transmission line gap under switching impulse *** positive leaders predominantly propagate discontinuously,with almost no significantly continuous propagation *** leader channels are intensely luminous and each elongation segment is straight,with streamers resembling the“branch type”which differs from the“diffuse type”streamers at the front of continuous propagation *** distribution of the propagation velocities is highly random(3.7–18.4 cm/μs),and the average velocity(9.2 cm/μs)significantly exceeds that of continuous propagation(1.5–2.0 cm/μs).Analysis suggests that the current-velocity models suitable for continuous leader propagation do not align well with the experimental data in re-illumination *** on the discharge current waveforms and optical images,it is speculated that the newly elongated leader in re-illumination mode does not evolve gradually from the stem(about 1 cm)but rather evolves overall from a thermal channel much longer than stem.

关键词： long air gap discharge positive leader re-illumination discontinuous leader propagation

Two-dimensional SEM image-based analysis of coal porosity and its pore structure

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International Journal of Coal Science & Technology 2020年第2期7卷 350-361页

作者： guangui Zou Jiasheng she Suping Peng Quanchun Yin Hongbin Liu Yuyan Che State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyBeijingBeijing100083China College of geoscience and Surveying Engineering China University of Mining and TechnologyBeijingBeijing100083China

A quantitative analysis of the porosity,pore size distribution,and fractal dimensions of pores is significant for studying the pore structure characteristics of *** study utilized 12 anthracite coal samples from the Sihe mining area to explore the pore structure characteristics of the coal *** randomly selected points on each sliced coal sample were imaged via scanning electron microscopy,and a total of 1200 images were used for the *** porosity and fractal dimensions of the coal samples were analyzed via digital image processing and box-counting dimension *** method is characterized by extensive graphical analysis,and the results are based on statistical *** were also used to analyze the structural and development characteristics of the microscopic pores in the *** results reveal that the surface porosity obtained via digital image processing was 16.11%lower than that measured *** fractal dimension and porosity of the pore surface were fitted to a natural logarithmic *** rate of change in the pore fractal dimension depends on the porosity such that,to some degree,a greater porosity is associated with more complex pore structures,a higher degree of micropore development,and improved pore connectivity.

关键词： Coal porosity SEM Pore structure Fractal dimensions digital image processing