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Thermal decomposition mechanism and kinetics of bastnaesite in suspension roasting process:A comparative study in N_(2) and air atmospheres

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journal of rare Earths 2024年第9期42卷 1809-1816,I0006页

作者： Wenbo li jijia chen shaokai cheng junyan sun Xiaolong Zhang school of resources and civil Engineering Northeastern UniversityShenyang110819China National-Local joint Engineering research center of High-Efficient Exploitation Technology for refractory Iron Ore resources Shenyang110819China

To investigate the thermal decomposition behavior and reaction kinetics of bastnaesite in suspension roasting,the gas and solid products of bastnaesite roasted in N2 and air atmospheres were examined using a gas analyzer,X-ray diffraction(XrD),scanning electron microscopy(sEm),and energy dispersive spectrometry(EDs).subsequently,the kinetic parameters of bastnaesite in the suspension roasting process were derived and calculated using the isothermal *** results show that the decomposition product of bastnaesite in N_(2) is ***,once the roasting temperature exceeds 600℃,cO is generated in addition to cO_(2),and all the XrD diffraction peaks of ceOF are shifted to the right,indicating that cO_(2) can oxidize ceOF and lead to the transformation of ce(Ⅲ) into ce(Ⅳ).When roasted in air,the decomposition product ceOF can be completely converted to ceF3 and ce_(7)O_(12) as it easily ***,the reaction rate of bastnaesite in air is higher than that of N_(2),and the starting reaction temperature is lower than that of N_(2).A large number of irregular cracks and holes appear on the surface of solid-phase products following suspension roasting,which are due to the thermal decomposition of bastnaesite that produces cO_(2) as well as the reconstruction of the lattice of the solid-phase *** reaction kinetic model of bastnaesite roasted in N_(2)(temperature range 600-750℃) and air(temperatu re range 500-575℃) confo rms to the A_(3/2) model with the mechanism function G(α)=-ln(1-α)^(2/3),and the reaction activation energy is 59.78 kj/mol and lnA is 1.65 s^(-1) in N_(2) *** air,the reaction activation energy is 100.30 kj/mol and lnA is 9.63 s^(-1).

关键词： rare earths Bastnaesite suspension roasting Thermal decomposition mechanism reaction kinetics

Numerical Investigation on Heat Transfer characteristics of microencapsulated Phase change material slurry in a rectangular minichannel

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journal of Thermal science 2024年第2期33卷 564-577页

作者： WANG Zhibin li Zilong jIA lisi DING Bin chen Ying school of materials and Energy Guangdong University of TechnologyGuangzhou510006China Guangdong Provincial Key Laboratory of Functional soft condensed matter Guangzhou510006China college of New Energy China University of Petroleum(East China)Qingdao266580China

microencapsulation phase change material slurry(mEPcms) becomes a potential working fluid for cooling high energy density miniaturized components,thanks to the latent heat absorption of particles in the heat transfer *** this work,the Discrete Phase model(DPm) based on the Euler-Lagrangian method is used to numerically investigate the convective heat transfer characteristics of mEPcms flowing through a rectangular minichannel with constant heat *** results show that particles of mEPcms are mainly subjected to drag force during the *** so,they can migrate from the high-temperature region to the low-temperature region driven by the thermophoretic force,affecting the particle distribution and phase change ***,the Nux of the mEPcms fluctuates due to particle phase change with varying specific heat ***,the value increases first,then decreases,and eventually increases again until it approaches the fully developed value of the pure base fluid as the particles gradually ***,the heat transfer performance of the mEPcms is influenced by the combination of fluid inlet temperature fluid inlet velocity(v),and mass concentration(c_(m)) of mEPcm *** result shows that the maximum reduction of the maximum bottom wall temperature difference(ΔT_(w)) is 23.98% at T_(in)=293.15 K,v=0.15 m·s^(-1),c_(m)=10%.

关键词： microencapsulated Phase change material slurry(mPcms) Discrete Phase model(DPm) particle-fluid interaction force minichannel heat sink thermophoresis

A dual-mode optical thermometer based on dual-excitation Bi^(3+),sm^(3+)co-doped Y_(4)GeO_(8) phosphors

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journal of rare Earths 2024年第8期42卷 1437-1446,I0002页

作者： Danyu Zhang Yuxuan Luo junyu chen lianjie li Hai Guo Department of Physics Zhejiang Normal UniversityJinhua321004China

Dual-excitation and dual-emission Y_(4)GeO_(8):Bi^(3+),sm^(3+)phosphors were manufactured by traditional solidphase sintering *** X-ray diffraction,morphology,photoluminescence,energy transfer process and temperature sensing properties of Y_(4)GeO_(8):Bi^(3+),sm^(3+)samples were comprehensively *** Y4GeO_(8):Bi^(3+),sm^(3+)phosphors exhibit characteristic emissions of Bi^(3+)(^(3)P_(1)→^(1)s_(0)) and sm^(3+)(^(4)G_(5/2)→^(6)H)under both 290 and 347 nm *** fluorescence intensity ratio and commission International de L'Eclairage coordinates modes,Y_(4)GeO_(8):Bi^(3+),sm^(3+)samples present excellent temperature measurement *** maximum relative sensitivity(s_(r-max)) values of the former are 1.55%/K(460 K,290 nm excitation) and 0.82%/K(506 K,347 nm excitation).The s_(r-max)(x) values of the latter are 0.21 %/K(437 K,290 nm excitation) and 0.15%/K(513 K,347 nm excitation).These results illustrate that Y_(4)GeO_(8):Bi^(3+),sm^(3+)phospho rs can be used as a candidate material for a dual-mode optical thermometer under dual-excitation.

关键词： Dual-mode optical thermometer Luminescent properties Y_(4)GeO_(8):Bi^(3+) sm^(3+)phosphors rare earths

Facile synthesis of accordion-like porous carbon from waste PET bottles-based mIL-53(Al) and its application for high-performance Zn-ion capacitor

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Green Energy & Environment 2024年第7期9卷 1138-1150页

作者： jiaxin li shuai Zhang Yumeng Hua Yichao lin Xin Wen Ewa mijowska Tao Tang Xuecheng chen rodney s.ruoff Faculty of chemical Technology and Engineering West Pomeranian University of Technology Key state Key Laboratory of Polymer Physics and chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences school of safety Engineering China University of Mining and Technology Institute of Advanced Electrical materials Qingdao University of Science and Technology Institute for Basic science center for multiple Dimensional carbon materials Department of chemistry Ulsan National Institute of Science and Technology (UNIST) Department of materials science and Engineering Ulsan National Institute of Science and Technology (UNIST) school of Energy and chemical Engineering Ulsan National Institute of Science and Technology (UNIST)

It is of great scientific and economic value to recycle waste poly（ethylene terephthalate）(PET) into high-value PET-based metal organic frameworks（mOFs） and further convert it into porous carbon for green energy storage applications. In the present study, a facile and costeffective hydrothermal process was developed to direct recycle waste PET bottles into mIL-53（Al） with a 100% conversation, then the mOFderived porous carbon was assembled into electrodes for high-performance supercapacitors. The results indicated that the as-synthesized carbon exhibited high ssA of 1712 m2g-1and unique accordion-like structure with hierarchical porosity. Benefit to these advantageous characters, the assembled three-electrode supercapacitor displayed high specific capacitances of 391 F g-1at the current density of 0.5 A g-1and good rate capability of 73.6% capacitance retention at 20 A g-1in 6 mol L-1KOH electrolyte. Furthermore, the assembled zinc ion capacitor still revealed outstanding capacitance of 335 F g-1at 0.1 A g-1, excellent cycling stability of 92.2% capacitance retention after 10 000 cycles and ultra-high energy density of 150.3 Wh kg-1at power density of 90 W kg-1in 3 mol L-1ZnsO4electrolyte. It is believed that the current work provides a facile and effective strategy to recycle PET waste into high-valuable mOF, and further expands the applications of mOF-derived carbons for high-performance energy storage devices, so it is conducive to both pollution alleviation and sustainable economic development.

关键词： PET recycling Porous carbon supercapacitor Energy storage

mXene-based all-solid flexible electrochromic microsupercapacitor

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microsystems & Nanoengineering 2024年第3期10卷 347-355页

作者： shanlu Guo ruihe Zhu jingwei chen Weilin liu Yuxiang Zhang jianmin li Haizeng li college of Electronic and Optical Engineering&college of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China school of materials science and Engineering Ocean University of ChinaQingdao 266100China Optics and Thermal radiation research center Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China shenzhen research Institute of shandong University Shenzhen 518000China state Key Laboratory of Featured metal materials and life cycle safety for composite structures Guangxi UniversityNanning 530004China

With the increasing demand for multifunctional optoelectronic devices,flexible electrochromic energy storage devices are being widely recognized as promising platforms for diverse ***,simultaneously achieving high capacitance,fast color switching and large optical modulation range is very *** this study,the mXenebased flexible in-plane microsupercapacitor was fabricated via a mask-assisted spray coating *** adding electrochromic ethyl viologen dibromide(EVB)into the electrolyte,the device showed a reversible color change during the charge/discharge *** to the high electronic conductivity of the mXene flakes and the fast response kinetics of EVB,the device exhibited a fast coloration/bleaching time of 2.6 s/2.5 s,a large optical contrast of 60%,and exceptional coloration *** addition,EVB acted as a redox additive to reinforce the energy storage performance;as a result,the working voltage window of the Ti_(3)c_(2)-based symmetric aqueous microsupercapacitor was extended to 1 ***,the device had a high areal capacitance of 12.5 mF cm^(−2)with superior flexibility and mechanical stability and showed almost 100%capacitance retention after 100 bending *** as-prepared device has significant potential for a wide range of applications in flexible and wearable electronics,particularly in the fields of camouflage,anticounterfeiting,and displays.

关键词： capacitance kinetics exceptional

A Novel Graph structure Learning Based semi-supervised Framework for Anomaly Identification in Fluctuating IoT Environment

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computer modeling in Engineering & sciences 2024年第9期140卷 3001-3016页

作者： Weijian song Xi li Peng chen juan chen jianhua ren Yunni Xia school of computer and software Engineering Xihua UniversityChengdu610039China West china second University Hospital Sichuan UniversityChengdu610065China school of computer science Chongqing UniversityChongqing400044China

With the rapid development of Internet of Things(IoT)technology,IoT systems have been widely applied in health-care,transportation,home,and other ***,with the continuous expansion of the scale and increasing complexity of IoT systems,the stability and security issues of IoT systems have become increasingly ***,it is crucial to detect anomalies in the collected IoT time series from various ***,deep learning models have been leveraged for IoT anomaly ***,owing to the challenges associated with data labeling,most IoT anomaly detection methods resort to unsupervised learning ***,the absence of accurate abnormal information in unsupervised learning methods limits their *** address these problems,we propose As-GcN-mTm,an adaptive structural Graph convolutional Networks(GcN)-based framework using a mean-teacher mechanism(As-GcN-mTm)for anomaly *** performs better than unsupervised methods using only a small amount of labeled *** Teachers is an effective semi-supervised learning method that utilizes unlabeled data for training to improve the generalization ability and performance of the ***,the dependencies between data are often unknown in time series *** solve this problem,we designed a graph structure adaptive learning layer based on neural networks,which can automatically learn the graph structure from time series *** not only better captures the relationships between nodes but also enhances the model’s performance by augmenting key *** have demonstrated that our method improves the baseline model with the highest F1 value by 10.4%,36.1%,and 5.6%,respectively,on three real datasets with a 10%data labeling rate.

关键词： IoT multivariate time series anomaly detection graph learning semi-supervised mean teachers

Transient receptor potential vanilloid 1 involved in the analgesic effects of total flavonoids extracted from Longxuejie(resina Dracaenae cochinchinensis)

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journal of Traditional chinese medicine 2024年第3期44卷 437-447页

作者： mO Xiaoqiang chen Yating YIN Qian chen Haibo BAN Qiang li jun chen su YAO jinguang Department of stomatology Affiliated Hospital of Youjiang Medical University for NationalitiesBaise 533000China college of General Practitioners Youjiang Medical University for NationalitiesBaise 533000China college of Biomedical Engineering South-Central Minzu UniversityKey Laboratory of Cognitive Science of State Ethnic Affairs CommissionHubei Key Laboratory of Medical Information Analysis and Tumor Diagnosis and TreatmentWuhan 430074China college of Pharmacy South-Central Minzu UniversityWuhan 430074China

OBjEcTIVE: To evaluate the analgesic effects of total flavonoids of Longxuejie(resina Dracaenae cochinchinensis)(TFDB) and explore the possible analgesic mechanism associated with transient receptor potential vanilloid 1(TrPV1).mETHODs: Whole-cell patch clamp technique was used to observe the effects of TFDB on capsaicin-induced TrPV1 currents. rat experiments in vivo were used to observe the analgesic effects of TFDB. Western blot and immunofluorescence experiments were used to test the change of TrPV1 expression in DrG neurons induced by ***: results showed that TFDB inhibited capsaicin-induced TrPV1 receptor currents in acutely isolated dorsal root ganglion(DrG) neurons of rats and the half inhibitory concentration was(16.7 ± 1.6) mg/***(2-20 mg/kg) showed analgesic activity in the phase Ⅱ of formalin test and(0.02-2 mg per paw)reduced capsaicin-induced licking times of rats. TFDB(20 mg/kg) was fully efficacious on complete Freund's adjuvant(cFA)-induced inflammatory thermal hyperalgesia and capsaicin could weaken the analgesic effects. The level of TrPV1 expressions of DrG neurons was also decreased in TFDB-treated cFA-inflammatory pain ***: All these results indicated that the analgesic effect of TFDB may contribute to their modulations on both function and expression of TrPV1 channels in DrG neurons.

关键词： Freund's adjuvant formaldehyde capsaicin flavonoids Longxuejie(resina Dracaenae cochinchinensis) transient receptor potential vanilloid 1 inflammatory pain

A three-way electrolyte with ternary solvents for high-energy-density and long-cycling lithium-sulfur pouch cells

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susmat 2024年第2期4卷 1-12页

作者： Zheng li Legeng Yu chen-Xi Bi Xi-Yao li jinma Xiang chen Xue-Qiang Zhang Aibing chen Haoting chen Zuoru Zhang li-Zhen Fan Bo-Quan li cheng Tang Qiang Zhang Tsinghua center for Green chemical Engineering Electrification Beijing Key Laboratory of Green Chemical Reaction Engineering and TechnologyDepartment of Chemical EngineeringTsinghua UniversityBeijingChina school of materials science and Engineering Beijing Institute of TechnologyBeijingChina Institute of Advanced materials and Technology University of Science and TechnologyBeijingChina shanxi research Institute for clean Energy Tsinghua UniversityTaiyuanChina center for Next-Generation Energy materials and school of chemical Engineering Sungkyunkwan UniversityJangan-GuSuwon-SiGyeonggi-DoRepublic of Korea college of chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuangChina Ordos carbon Neutral research and Application co. Ltd.Kangbashi DistrictOrdos CityInner MongoliaChina Institute for carbon Neutrality Tsinghua UniversityBeijingChina

lithium–sulfur(li–s)batteries promise high-energy-density potential to exceed the commercialized lithiumion batteries but suffer from limited cycling lifespan due to the side reactions between lithium polysulfides(liPss)and li metal ***,a three-way electrolyte with ternary solvents is proposed to enable high-energy-density and long-cycling li–s pouch ***,ternary solvents composed of 1,2-dimethoxyethane,di-isopropyl sulfide,and 1,3,5-trioxane are employed to guarantee smooth cathode kinetics,inhibit the parasitic reactions,and construct a robust solid electrolyte interphase,*** cycling lifespan of li–s coin cells with 50μm li anodes and 4.0 mg cm^(−2) sulfur cathodes is prolonged from88 to 222 cycles using the three-way ***-heterogeneous solvation structure of liPss and organic-rich solid electrolyte interphase are identified to improve the cycling stability of li metal ***,a 3.0 Ah-level li–s pouch cell with the three-way electrolyte realizes a high energy density of 405 Wh kg^(−1) and undergoes 27 *** affords a three-way electrolyte recipe for suppressing the side reactions of liPss and inspires rational electrolyte design for practical high-energy-density and long-cycling li–s batteries.

关键词： lithium metal anodes lithium-sulfur batteries pouch cells solid electrolyte interphase three-way electrolyte

spatio-Temporal service Analysis in multi-Layer Non-Terrestrial Networks

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journal of communications and Information Networks 2024年第1期9卷 43-55页

作者： Qian chen Weixiao meng shuai Han cheng li school of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China school of Engineering science Simon Fraser UniversityBurnabyBC V5A 1S6Canada Department of Electrical and computer Engineering Memorial UniversitySt.John’sNL A1B 3X5Canada

In the advent of the 6G era, non-terrestrial networks (NTN) with expansive coverage are being increasingly recognized as a vital supplement to cellular networks for facilitating seamless communication. The intricate interplay between network performance and service quality necessitates a thorough investigation into the modeling and analysis of services for efficient construction of *** studies on service analysis, predominantly focused on terrestrial networks,fall short in addressing the unique challenges posed by NTN,particularly those related to platform distribution and antenna gain modeling. This deficiency in research,coupled with the varying preferences of users for different network types, forms the basis of this study. This paper explores the spatio-temporal characteristics of services within a multi-layered NTN *** this context,the spatial distribution of the platforms is modeled using a binomial point process, and the antennas are characterized by a sectorized beam pattern. We derive the closed-form expressions for the association probability,the number of accessed users, and the arrival rate of services with certain delay requirements towards different types of NTN. simulation results are provided to evaluate the influence of various parameters on the association probability, the number of accessed users, and the total arrival rate of services. The number of satellites can be determined to achieve the optimal system utility,balancing the accessed services, offloading effects, and launching costs. This initial investigation lays the groundwork for further theoretical progress in the service analysis and platform deployment of NTN.

关键词： association strategy non-terrestrial networks service analysis stochastic geometry system utility