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Selective precipitation and non-isothermal crystallization kinetics of britholite from low grade REE-bearing slag

Journal of Rare Earths 2023年第11期41卷 1812-1818,I0006页

作者： Zhuang Ma Zengwu Zhao Xingqi guo wentao guo School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010China Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou014010China Inner Mongolia Autonomous Regional Engineering Technology Research Center of Sustainable Exploitation of Rare Earth Secondary Resources Inner Mongolia University of Science and TechnologyBaotou014010China

In order to improve the recovery rate of rare earth,the effect of P_(2)O_(5) and cooling rate on the selective precipitation of CaO-SiO_(2)-TiO_(2)-P_(2)O_(5)-Nb_(2)O_(5)-CeO_(2)-CaF_(2) slag system was explored using X-ray powder diffraction,a scanning electron microscope,an electron probe micro-analyzer and a confocal laser scanning *** apatite(Ca_(2.02)Ce_(7.98)Si_(6.00)O_(26.00))is tiny and difficult to be separated from the slag without P_(2)O_(5).When the addition of P_(2)O_(5) is 6 wt%-10 wt%,the cerium and phosphorus are found to be enriched in britholite(Ca_(5-x)Ce_(x)[(SiO_(4))_(x)(PO_(4))_(3-x)]F)phase while x is negatively correlated with P_(2)O_(5) content in the *** influence of P_(2)O_(5) and cooling rate on the non-isothermal crystallization kinetics was also *** the cooling rate between 5 and 40℃/min,continuous cooling transformation diagram of britholite was constructed when the P205 content is between 6 wt%-10 wt%.The modified Avrami model was applied to determine the crystallization mode of slag with 10 wt%P_(2)O_(5).It is shown that the crystallization mode is diffusion-controlled with constant nucleation rate and one-dimensional *** consideration of quantity and volume of crystals,the reasonable cooling rate is between 10and 30℃/min.

关键词： P_(2)O_(5) Crystallization Kinetics Low grade REE-bearing slag Rare earths

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Innovative Group-Decoupling Design of a Segment Erector Based on G_F Set Theory

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Chinese Journal of Mechanical Engineering 2013年第2期26卷 264-274页

作者： guo wentao guo Weizhong GAO Feng MO Pinxi State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong University

The segment erector is a key part of the shield machines for tunnel engineering. The available segment erectors are all of serial configuration which is suffering from the problems of low rigidity and accumulative motion errors. The current research mainly focuses on improving assembly accuracy and control performance of serial segment erectors. An innovative design method is proposed featuring motion group-decoupling, based on which a new type of segment erector is developed and investigated. Firstly, the segment installation manipulation is analyzed and decomposed into three motion groups that are decoupled. Then the type synthesis for the 4-DOF motion group is performed based on the general function（GF） set theory and a new configuration of （1T？1R？1PS3UPS） is attained according to the segment manipulation requirements. Consequently, the kinematic models are built and the reducibility and accuracy are analyzed. The dexterity is verified though numerical simulation and no singular points appear in the workspace. Finally, a positioning experiment is carried out by using the prototype developed in the lab that demonstrates a 13.1% improvement of positioning accuracy and the feasibility of the new segment erector. The presented group-decoupling design method is able to invent new type of hybrid segment erectors that avoid the accumulative motion error of erecting.

关键词： segment erector group-decoupling design type synthesis parallel mechanism GF Set

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Estimate pose deviation of on-orbit deployable mechanisms based on cross-ratio invariability

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Chinese Journal of Aeronautics 2024年第10期37卷 483-492页

作者： Peiran ZHANG Fuqiang ZHOU Zhipeng SONG wentao guo Haishu TAN School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China School of Physics and Optoelectronic Engineering Foshan UniversityFoshan 528225China

With the rapid development of space science projects,large deployable mechanisms have been widely ***,due to the effects of mechanical friction and gravitational acceleration,on-orbit mechanisms cannot be always deployed to the expected *** some precision optical mechanisms,even a minor deviation can result in significant error,so it needs to be measured and *** this paper,the deployment process was modeled and simplified as rotation under single-rotation-axis constraint and translation under single-direction *** solve the problem,a method based on cross-ratio invariability was *** proposed method does not rely on camera calibration techniques,as well as artificial marking points,both of which are necessary in ***,only three calibration images before launch and a measurement image on orbit were *** and experiments demonstrated that the proposed method is more accurate than *** addition,experiments also proved that the feasibility of the proposed method under dark conditions with the aid of a light source and some reflective marking points.

关键词： Cross-ratio invariability Deployable mechanism Pose deviation estimation Single-DOF constraint Vision measurement

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Vacancy defect MoSeTe embedded in N and F co-doped carbon skeleton for high performance sodium ion batteries and hybrid capacitors

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Journal of Energy Chemistry 2024年第3期90卷 652-664,I0014页

作者： Dehui Yang wentao guo Fei guo Jiaming Zhu Gang Wang Hui Wang Guanghui Yuan Shenghua Ma Beibei Wang State Key Laboratory of Photon-Technology in Western China Energy International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi’an 710127ShannxiChina Key Laboratory of Synthetic and Natural Functional Molecule Chemistry(Ministry of Education) College of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127ShannxiChina School of Chemistry and Chemical Engineering Ankang Research Centre of New Nano-materials Science and TechnologyShaanxi University Innovation Research Institute of Advanced Energy Storage Materials and Battery Technology for Future IndustrializationAnkang UniversityAnkang 725000ShannxiChina

Sodium-ion batteries(SIBs) and hybrid capacitors(SIHCs) have garnered significant attention in energy storage due to their inherent advantages,including high energy density,cost-effectiveness,and enhanced ***,developing high-performance anode materials to improve sodium storage performa nce still remains a major ***,a facile one-pot method has been developed to fabricate a hybrid of MoSeTe nanosheets implanted within the N,F co-doped honeycomb carbon skeleton(MoSeTe/N,F@C).Experimental results demonstrate that the incorporation of large-sized Te atoms into MoSeTe nanosheets enlarges the layer spacing and creates abundant anion vacancies,which effectively facilitate the insertion/extraction of Na^(+) and provide numerous ion adsorption sites for rapid surface capacitive ***,the heteroatoms N,F co-doped honeycomb carbon skeleton with a highly conductive network can restrain the volume expansion and boost reaction kinetics within the *** anticipated,the MoSeTe/N,F@C anode exhibits high reversible capacities along with exceptional cycle *** coupled with Na_(3)V_(2)(PO_(4))_(3)@C(NVPF@C) to form SIB full cells,the anode delivers a reversible specific capacity of 126 mA h g^(-1) after 100 cycles at 0.1 A g^(-1).Furthermore,when combined with AC to form SIHC full cells,the anode demonstrates excellent cycling stability with a reversible specific capacity of50 mA h g^(-1) keeping over 3700 cycles at 1.0 A g^(-1).In situ XRD,ex situ TEM characterization,and theoretical calculations(DFT) further confirm the reversibility of sodium storage in MoSeTe/N,F@C anode materials during electrochemical reactions,highlighting their potential for widespread practical *** work provides new insights into the promising utilization of advanced transition metal dichalcogenides as anode materials for Na^(+)-based energy storage devices.

关键词： MoSeTe N F co-doped honeycomb carbon skeleton Sodium-ion batteries Sodium-ion hybrid capacitor

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Using Recurrent Neural Network Structure and Multi-Head Attention with Convolution for Fraudulent Phone Text Recognition

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Computer Systems Science & Engineering 2023年第8期46卷 2277-2297页

作者： Junjie Zhou Hongkui Xu Zifeng Zhang Jiangkun Lu wentao guo Zhenye Li School of Information and Electrical Engineering Shandong Jianzhu UniversityJinan250000China

Fraud cases have been a risk in society and people’s property security has been greatly *** recent studies,many promising algorithms have been developed for social media offensive text recognition as well as sentiment *** algorithms are also suitable for fraudulent phone text *** to these tasks,the semantics of fraudulent words are more complex and more difficult to *** Neural Networks(RNN),the variants ofRNN,ConvolutionalNeuralNetworks(CNN),and hybrid neural networks to extract text features are used by most text classification ***,a single network or a simple network combination cannot obtain rich characteristic knowledge of fraudulent phone texts ***,a new model is proposed in this *** the fraudulent phone text,the knowledge that can be learned by the model includes the sequence structure of sentences,the correlation between words,the correlation of contextual semantics,the feature of keywords in sentences,*** new model combines a bidirectional Long-Short Term Memory Neural Network(BiLSTM)or a bidirectional Gate Recurrent United(BiGRU)and a Multi-Head attention mechanism module with convolution.A normalization layer is added after the output of the final hidden *** or BiGRU is used to build the encoding and decoding ***-head attention mechanism module with convolution(MHAC)enhances the ability of the model to learn global interaction information and multi-granularity local interaction information in fraudulent sentences.A fraudulent phone text dataset is produced by us in this *** THUCNews data sets and fraudulent phone text data sets are used in *** results show that compared with the baseline model,the proposed model(LMHACL)has the best experiment results in terms of Accuracy,Precision,Recall,and F1 score on the two data *** the performance indexes on fraudulent phone text data sets are all above 0.94.

关键词： BiLSTM BiGRU multi-head attention mechanism CNN

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Cascade Cross-Coupling/[3,3]-Sulfonium Rearrangement of Alkynyl Sulfoxides and Ynamides/Ynol Ethers to Construct Tetrasubstituted Furans

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有机化学 2024年第7期44卷 2274-2285页

作者： Meng Shuyu guo wentao Wang Quanrui Department of Chemistry Fudan UniversityShanghai 200438

A transition-metal-free strategy for the synthesis of tetrasubstituted furans is *** by boron trifluo-ride diethyl etherate,the reaction of alkynyl sulfoxides with ynamides/ynol ethers proceeded via a cascade process including cross-coupling of the two reactants,[3,3]-sulfonium rearrangement,and 5-exo-dig heterocyclization,leading to tetrasubstituted furan *** resultant α-alkylthio groups can be used for further functionalization,such as to introduce other alkyl/aryl groups.

关键词： heterocyclization -rearrangement sulfonium ion tandem reaction tetrasubstituted furan

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974 nm双光纤光栅激光器随温度变化特性

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中国激光 2020年第7期47卷 307-313页

作者：郭文涛郭小峰谭满清中国科学院半导体研究所集成光电子学国家重点实验室北京100083 中国科学院大学材料科学与光电技术学院北京100049

对974 nm双光纤光栅激光器的温度特性进行理论分析与实验研究,理论模拟了双光纤光栅的栅距对反射率的影响。先在室温(25℃)下测试器件的光谱,与未加双光纤光栅器件的光谱相比,双光纤光栅激光器的光谱中的次峰得到明显抑制,测试得到峰值... 详细信息

对974 nm双光纤光栅激光器的温度特性进行理论分析与实验研究,理论模拟了双光纤光栅的栅距对反射率的影响。先在室温(25℃)下测试器件的光谱,与未加双光纤光栅器件的光谱相比,双光纤光栅激光器的光谱中的次峰得到明显抑制,测试得到峰值波长(974.07 nm)锁定在光栅的中心波长974 nm附近。对器件的功率电流电压特性进行测试,当工作电流达到400 mA时,尾纤输出功率大于253 mW。再分别测试器件在全温范围下的波长变化率和功率变化率,得到波长变化率小于8.2×10-3 nm/℃。最后测试器件的微分结构函数曲线并分析热阻分布,通过优化热沉的烧结工艺使器件功率变化率小于1.06%。

关键词：激光器半导体激光器双光纤光栅波长稳定性功率稳定性

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Nuclear Shape-phase Diagrams

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2007年第1期 44-45页

作者： Liu Minliang Zhang Yuhu Zhou Xiaohong guo Yingxiang Lei Xiangguo guo wentao

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《政务处分法》双轨惩戒制度之间的衔接协调

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法学 2020年第12期 147-158页

作者：郭文涛西南政法大学监察法学院

按照《政务处分法》的相关规定,对于违法的公职人员,该法建立了双轨惩戒制度:监察委员会可以作出“政务处分”,任免机关、单位可以作出“处分”。任免机关、单位对违法公职人员的处分权来源于行政管理权或人事任免权,属于任免机关、单... 详细信息

按照《政务处分法》的相关规定,对于违法的公职人员,该法建立了双轨惩戒制度:监察委员会可以作出“政务处分”,任免机关、单位可以作出“处分”。任免机关、单位对违法公职人员的处分权来源于行政管理权或人事任免权,属于任免机关、单位内部控制行为;监察机关对违法公职人员的政务处分权来源于监察权,尤其是处置权,属于一种外部惩戒措施。双轨惩戒制度在适用对象上实现了公职人员全覆盖,在违法情形、处分种类和适用规则上实现了统一;在名称上实行政务处分和处分的两分法,在数量上实行“一事不再罚”原则,在程序和救济制度上也有所不同。双轨惩戒制度有合有分,并行不悖,但可能存在不衔接、不协调之处:监察机关和任免机关、单位可能争夺惩戒管辖权,特殊公职人员的惩戒管辖权未作出特别规定,监察机关和任免机关、单位惩戒信息缺乏共享机制,监察机关和任免机关、单位可能相互推诿或者不作为。针对这些不衔接协调之处,可以从以下四个方面进行完善:根据违法行为的不同,界分惩戒管辖权;监察机关应当尊重任免机关、单位对特殊公职人员的惩戒权;在监察机关和任免机关、单位之间建立惩戒信息共享机制;加强对监察机关和任免机关、单位的监督制约。

关键词：政务处分处分公职人员惩戒

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新时代特定区域法制先行的法理分析

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重庆大学学报（社会科学版） 2024年第5期30卷 207-221页

作者：郭文涛海南大学法学院海南海口570228

新时代,为推动形成更高层次改革开放新格局,党和国家在自由贸易试验区、上海浦东新区、海南自由贸易港等特定区域设立了一系列与行政区划相区别,而由国家权力机关授权行为明确支持的特殊区域。这些特殊区域的省级人大及其常委会在遵循... 详细信息

新时代,为推动形成更高层次改革开放新格局,党和国家在自由贸易试验区、上海浦东新区、海南自由贸易港等特定区域设立了一系列与行政区划相区别,而由国家权力机关授权行为明确支持的特殊区域。这些特殊区域的省级人大及其常委会在遵循宪法以及法律和行政法规基本原则的前提下,可以根据授权制定特定区域法规,对法律、行政法规等作出变通规定,从而让特定区域法制先行起来;特定区域法规的授权事项比经济特区法规更加宽广,甚至涉及法律保留和行政法规保留事项,是经济特区法规升级版和扩大版,是2.0版本。新时代特定区域法制先行的法律属性,应是一种调整适用型授权立法。特定区域法制先行面临的最大合宪性诘难,就是如何与宪法国家法制统一原则相融合。传统宪法理论认为,国家法制统一原则就是在中央与地方立法关系上,地方制定的下位法不得与中央制定的上位法相抵触。不同类型地方性法规对应着不同的抵触类型,适用不同判断标准。特定区域法规这种特殊先行性法规不存在法权抵触,不适用法条抵触,而应适用法意抵触,只要没有间接抵触法律、行政法规等上位法基本原则,就没有违反宪法国家法制统一原则。全国人大常委会在授权事项、授权主体、授权行为上具有宪法依据,可以从宪法上职权条款中获得合宪性推定,其授权特定区域法制先行符合宪法序言国家根本任务精神,因而是合宪的。新时代特定区域法制先行符合宪法的精神、原则和规定,但并不意味着可以偏离法制轨道。特定区域法制先行本身在理论上就存在诸多争议,如不对其实践过程进行监控,就可能放大实践中的失误,造成人民对新时代改革开放事业的质疑。因此,有必要加强对其监控,使其全程纳入法制轨道。按照时间节点先后顺序,可以从授权前的合宪性审查、制定后的备案审查、实施中的评估报告义务三个方面加强对特定区域法制先行的监控。2023年《中华人民共和国立法法》第二次修订,全面总结了过去十年的经验与成就,将重大改革特别授权机制规范化,将上海浦东新区法规、海南自由贸易港法规等改革创新成果法律化,并为新时代特定区域法制先行预留了法律空间。

关键词：特定区域法制先行授权立法国家法制统一合宪性审查

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