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Effect of gas blowing nozzle angle on multiphase flow and mass transfer during RH refining process

International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 844-856页

作者： Jiahao Wang Peiyuan ni Chao chen Mikael Ersson Ying Li Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry School of MetallurgyNortheastern UniversityShenyang 110819China Liaoning Key Laboratory of Metallurgical Sensor Materials and Technology School of MetallurgyNortheastern UniversityShenyang 110819China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm SE-10044Sweden

A three-dimensional mathematical model was developed to investigate the effect of gas blowing nozzle angles on multiphase flow,circulation flow rate,and mixing time during Ruhrstahl-Heraeus(RH) refining ***,a water model with a geometric scale of 1:4 from an industrial RH furnace of 260 t was built up,and measurements were carried out to validate the mathematical *** results show that,with a conventional gas blowing nozzle and the total gas flow rate of 40 L·min^(-1),the mixing time predicted by the mathematical model agrees well with the measured *** deviations between the model predictions and the measured values are in the range of about 1.3%–7.3% at the selected three monitoring locations,where the mixing time was defined as the required time when the dimensionless concentration is within 3% deviation from the bath averaged *** addition,the circulation flow rate was 9 kg·s^(-1).When the gas blowing nozzle was horizontally rotated by either 30° or 45°,the circulation flow rate was found to be increased by about 15% compared to a conventional nozzle,due to the rotational flow formed in the ***,the mixing time at the monitoring point 1,2,and 3 was shortened by around 21.3%,28.2%,and 12.3%,*** the nozzle angle of 30° and 45°,the averaged residence time of 128 bubbles in liquid was increased by around 33.3%.

关键词： Ruhrstahl-Heraeus refining gas blowing nozzle angle circulation flow rate mixing time multiphase flow

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Achieving high conversion of syngas to aromatics

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Journal of Energy Chemistry 2022年第3期31卷 597-602,I0016页

作者： Yi Fu Youming ni Zhiyang chen Wenliang Zhu Zhongmin Liu National Engineering Laboratory for Methanol to Olefins Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of chinese Academy of Sciences Beijing 100049China

Realizing high CO conversion and high aromatics selectivity simultaneously in syngas-to-aromatics(STA)reaction is still ***,we report a 57.5%CO conversion along with 74%aromatics selectivity over a composite catalyst consisting of Fe/ZnCr_(2)O_(4)(Fe modified ZnCr_(2)O_(4)spinel)oxide and H-ZSM-5 *** of only 3 wt%of Fe onto ZnCr_(2)O_(4)can remarkably increase CO conversion without sacrificing the aromatics *** vacancy concentration is improved after impregnating *** highly dispersed iron carbide species is formed during the reaction over Fe/ZnCr_(2)O_(4)spinel *** synergistic effect of oxygen vacancy and iron carbide results in a rapid formation of abundant oxygenated intermediate species,which can be continuously transformed to aromatics in *** study provides a new insight into the design of highly efficient catalyst for syngas conversion.

关键词： Syngas Aromatics Fe/ZnCr_(2)O_(4)oxide H-ZSM-5 zeolite High conversion

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Imaging mechanical shear waves induced by piezoelectric ceramics in magnetic resonance elastography

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chinese Science Bulletin 2006年第6期51卷 755-760页

作者： chen Jun ni cheng ZHUANG Tiange Department of Biomedical Engineering Shanghai Jiao Tong University Shanghai 200030 China Siemens Mindit Magnetic Resonance Ltd. Shenzhen 518057 China

Magnetic Resonance Elastography (MRE) is a noninvasive technique to measure elas-ticity of tissues in vivo. In this paper, a mechanical shear wave MR imaging system experiment is set for MRE. A novel actuator is proposed to generate me-chanical shear waves propagating inside a gel phantom. The actuator is made of piezoelectric ce-ramics, and fixed on a plexiglass bracket. Both of the gel phantom and the actuator are put into a head coil inside the MR scanner’s bore. The actuator works synchronously with an MR imaging sequence running on the MR scanner. The sequence is modified from a FLASH sequence into a motion-sensitizing phase- contrast sequence for shear wave MR imaging. Shear wave images are presented, and these effects on the shear wave MR imaging system, including the stiffness of phantoms, the frequency of the actuator, the parameters of the motion-sensitizing gradient, and the oscillation of the patient bed, are discussed.

关键词：磁共振成像压电陶瓷序列设计成像机制剪力波生物医学

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Light-up lipid droplets for the visualization of lipophagy and atherosclerosis by coumarin-derived bioprobe

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chinese Chemical Letters 2021年第8期32卷 2385-2389页

作者： Jinrong Zheng shuheng Qin Lijuan Gui Hua Li Lixue Fan Yifei Yang Haiyan chen Hui Xu Zhenwei Yuan Department of Biomedical Engineering School of EngineeringChina Pharmaceutical UniversityNanjing 210009China School of Pharmacy Key Laboratory of Molecular Pharmacology and Drug Evaluation(Yantai University)Ministry of EducationCollaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of ShandongYantai UniversityYantai 264005China Department of Food Quality and Safety College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and ProcessingNanjing University of Finance and EconomicsNanjing 210023China

Lipid droplets(LDs) are intracellular lipid-metabolism organelles that involved in many physiological processes,metabolic disorders as well as diseases such as ***,the specific probes that can visually locate abnormal LDs-rich tissues and track LDs-associated behavior to the naked eye with adequate biosafety still are ***,we develop a new design strategy of LDs-targeted probe based on the solvatochromism of coumarin *** results revealed that the emission wavelength of coumarin fluorophores gradually red shift in different solvents with increasing polarity,while absorption wavelength almost *** a result,the enlarged stokes shift of coumarin was emerged from oil to ***,properly reducing water solubility and adding electronic donor at the structure of coumarins can enlarge this type of *** discovery was utilized to develop suitable probe for the image of LDs and LDs-rich tissues with high resolution and ***,LDs-associated behavior was visible to the naked eye during the process of lipophagy and *** deem that the developed probe here offers a new possibility to accurately diagnosis and analyse LDs-related diseases in clinic and preclinical study.

关键词： Lipid droplets Probe Lipophagy Atherosclerosis

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Fluid/melt inclusions in Cenozoic mantle xenoliths from Linqu, Shandong Province, eastern china: Implications for asthenosphere-lithosphere interactions

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chinese Science Bulletin 2010年第11期55卷 1067-1076页

作者： LIU JiQiang chen LiHui ni Pei State Key Laboratory for Mineral Deposit Research Institute of Geo-Fluid Research School of Earth Sciences and Engineering Nanjing Univer-sity Nanjing 210093 China

Fluid and melt inclusions in mantle xenoliths are thought as direct samples to study mantle liquids. Here we apply Raman mi- crospectroscopy and microthermometry to fluid/melt inclusions in lherzolite xenoliths in Qiaoshan basalts, a Miocene volcano in Linqu, Shandong Province, eastern china. These inclusions include (1) early CO2 fluid inclusions, (2) early carbonate melt inclu-sions, (3) late CO2 fluid inclusions, and (4) late silicate melt inclusions. Among the early CO2 fluid inclusions, most consist of high-density pure CO2, while others have small amounts of other components besides of CO2, including graphite, magnesite, Mg-calcite, CO and N2. The lowest trapping pressures are estimated to be 1.42 GPa and 0.80 GPa for the early and the late fluid inclusions, respectively. Because orthopyroxene is the main host mineral for the early carbonate melt inclusions, we propose that the formation of these carbonate melts is genetically associated with the interactions between CO2 fluids and silicate minerals, e.g. olivine and clinopyroxene. The diversity of minor components in the early CO2 fluid inclusions indicates that mantle peridotites had undergone redox reactions with penetrating fluids/melts. These observations suggest that the compositions of the lithospheric mantle beneath the studied area had been changed by asthenosphere-derived CO2-rich fluids/melts.

关键词：流体包裹体熔融包裹体岩石圈地幔地幔包体相互作用中国东部软流圈山东省

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Transductive Transfer Dictionary Learning Algorithm for Remote Sensing Image Classification

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2267-2283页

作者： Jiaqun Zhu Hongda chen Yiqing Fan Tongguang ni Aliyun School of Big Data Changzhou UniversityChangzhou213164China Hua Lookeng Honors College Changzhou UniversityChangzhou213164China

To create a green and healthy living environment,people have put forward higher requirements for the refined management of ecological resources.A variety of technologies,including satellite remote sensing,Internet of Things,artificial intelligence,and big data,can build a smart environmental monitoring *** sensing image classification is an important research content in ecological environmental *** sensing images contain rich spatial information andmulti-temporal information,but also bring challenges such as difficulty in obtaining classification labels and low classification *** solve this problem,this study develops a transductive transfer dictionary learning(TTDL)*** the TTDL,the source and target domains are transformed fromthe original sample space to a common *** trains a shared discriminative dictionary in this subspace,establishes associations between domains,and also obtains sparse representations of source and target domain *** obtain an effective shared discriminative dictionary,triple-induced ordinal locality preserving term,Fisher discriminant term,and graph Laplacian regularization termare introduced into the *** triplet-induced ordinal locality preserving term on sub-space projection preserves the local structure of data in low-dimensional *** Fisher discriminant term on dictionary improves differences among different sub-dictionaries through intra-class and inter-class *** graph Laplacian regularization term on sparse representation maintains the manifold structure using a semi-supervised weight graphmatrix,which can indirectly improve the discriminative performance of the *** TTDL is tested on several remote sensing image datasets and has strong discrimination classification performance.

关键词： Classification dictionary learning remote sensing image transductive transfer learning

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First observations of low latitude whistlers using WHU ELF/VLF receiver system

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Science china(Technological Sciences) 2017年第1期60卷 166-174页

作者： chen YanPing ni BinBin GU XuDong ZHAO ZhengYu YANG GuoBin ZHOU chen ZHANG YuanNong Department of Space Physics School of Electronic Information Wuhan University Wuhan 430072 China

The recently developed high-quality WHU ELF/VLF receiver system has been deployed in Suizhou, china （geomagnetic lati- tude 21.81°N, longitude 174.44°E, L=1.16） to detect low latitude extremely-low-frequency （ELF： 0.3-3 kHz） and very-low-frequency （VLF： 3-30 kHz） emissions originating from either natural or artificial sources since February 2016. Dur- ing the first-month operation of the receiver system, a total of 3039 clear whistlers have been recorded at this low latitude sta- tion with the majority （97.0%） occurring on 28 February and 1 March 2016. Observed whistlers manifest various types includ- ing single one-hop, echo train, multi-flash, and multi-path. They tend to intensify after local midnight, reach the peak around 04435 LT, and then weaken quickly. Both features of lower cutoff frequencies of most whistlers below -1.6 kHz and almost uniform dispersion for many successive multi-flash whistlers suggest that these whistlers propagate along the geomagnetic field lines in the duct mode. The computed dispersion varies between -15 s1/2 and 23 s1/2 for observed one-hop whistlers and is greater than 50 sm for three-hop echo train whistlers, indicating that the whistlers observed at the Suizhou station are low lati- tude whistlers.

关键词： WHU ELF/VLF receiver whistlers dispersion duct mode

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Strongly secure identity-based authenticated key agreement protocols in the escrow mode

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Science china(Information Sciences) 2013年第8期56卷 189-202页

作者： ni Liang chen GongLiang LI JianHua HAO YanYan School of Information Security Engineering Shanghai Jiaotong University Experiment Management Center Zhongzhou University

Escrowable identity-based authenticated key agreement(AKA) protocols are desirable under certain circumstances especially in certain closed groups *** this paper,we focus on two-party identitybased AKA schemes in the escrow mode,and present a strongly secure escrowable identity-based AKA protocol which captures all basic desirable security properties including perfect forward secrecy,ephemeral secrets reveal resistance and so *** protocol is provably secure in the extended Canetti-Krawczyk model,and its security can be reduced to the standard computational bilinear Diffie-Hellman assumption in the random oracle *** no adversary can obtain the master private key for the escrow mode,our scheme is secure as long as each party has at least one uncompromised ***,we present two strongly secure variants of the protocol,which are computationally more efficient than the original scheme.

关键词： authenticated key agreement identity-based cryptography key escrow provable security bilinear Diffie-Hellman assumption

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TDOA Localization Algorithm with Compensation of Clock Offset for Wireless Sensor Networks

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china Communications 2015年第10期12卷 193-201页

作者： XIONG Hui chen Zhiyuan YANG Beiya ni Rongpei School of Electronic Science and Technology National university of Defense Technology

This paper presents a source localization algorithm based on the source signal's time-difference-of-arrival(TDOA) for asynchronous wireless sensor *** obtain synchronization among anchors,all anchors broadcast signals periodically,the clock offsets and skews of anchor pairs can be estimated using broadcasting signal's time-of-arrivals(TOA) at anchors.A kalman filter is adopted to improve the accuracy of clock offsets and track the clock drifts due to random *** the source transmits signal,the TOAs at anchors are stamped respectively and source's TDOA error due to clock offset and skew of anchor pair can be mitigated by a compensation *** on a Gaussian noise model,maximum likelihood estimation(MLE) for the source position is *** issues are addressed by evaluating the Cramer-Rao lower bound and the selection of broadcasting *** proposed algorithm is simple and effective,which has close performance with synchronous TDOA algorithm.

关键词： wireless sensor network asynchronous sensors Kalman filter localiza-tion time-difference-of-arrival(TDOA) time-of-arrival(TOA) clock offset and skew estimation

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Microstructure and properties of in-situ synthesized Cu-1 wt%TiC alloy followed by ECAP and post-annealing

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Progress in Natural Science:Materials International 2016年第6期26卷 643-649页

作者： Shizhan ni Jinghua Jiang Jianqing chen Dan Song Aibin Ma College of Mechanics and Materials Hohai University

A dispersion-strengthened copper alloy with 1 wt% TiC for commercial electrical-contact wires was prepared by in-situ reaction casting, grain-ultrafining by equal-channel angular pressing(ECAP) and subsequent annealing with aim to obtain excellent comprehensive performance. The results showed that fine TiC particles were in-situ synthesized in the as-cast Cu matrix and aggregated in clusters, and thus mechanical properties of the as-cast alloy deemed insufficient. Continued ECAP at 473 K significantly refined the grains of the as-cast alloy and improved the distribution of TiC particles. Due to multiple strengthening mechanisms, the ECAP-processed alloys maintained good conductivity with obviously enhanced tensile strength and hardness values. After postECAP annealing, the elongation and conductivity of the fine-grained copper alloy increased with the adequate tensile strength. The novel combined process endows the alloy appropriate performance to serve current highfrequency electrification railway systems.

关键词： Cu-1 wt%TiC alloy In-situ reaction Dispersion strengthen Equal channel angular pressing Annealing Mechanical properties Conductivity

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