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Pre-reduction of WO_(3)-Co_(3)O_(4)by H_(2)-C_(2)H_4 in a fluidized bed

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Chinese Journal of Chemical Engineering 2024年第2期66卷 273-284页

作者： Huijun shang Hengli li Weijun li feng Pan Zhan Du State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences(CAS)Beijing 100190China College of Chemical Engineering Nanjing Technology UniversityNanjing 211816China School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832003China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Chinalco Environmental Protection and Energy Conservation Group Co. Ltd.Xiong’an 071700China

In order to avoid the formation ofηphase(W_(6)Co_(6)C or W_(3)Co_(3)C)that adversely affects the sintering process and its products in the preparation process of ultra-fine WC-Co powder,a technical route of prereduction of WO_(3)-Co_(3)O_(4)to WO_(2)-Co and then deep reduction carbonization to WC-Co powder has been *** study mainly investigates the influence of gas partial pressure on the pre-reduction process of WO_(3)-Co_(3)O_(4)under a mixed atmosphere of H_(2)-C_(2)H_(4)-Ar at 600℃and establishes the kinetic equations of pre-reduction and carbon *** results indicate that increasing the partial pressure of hydrogen is conducive to the rapid and complete conversion of WO_(3) to WO_(2).High carbon content can be generated by the deposition of C_(2)H_(4),and it hinders the diffusion of the reducing gas;WO_(3)still cannot be completely reduced to WO_(2)as the partial pressure of C_(2)H_(4) increases to 60%.For the carbon evolution of C_(2)H_(4),the carbon amount is positively related to the H_(2)partial pressure,but it shows the highest amount and evolution rate when the ethylene partial pressure is 20%.Based on the reduction rate curves of WO_(3) and carbon evolution rate curves of C_(2)H_(4),the rate equations of pre-reduction and carbon evolution of WO_(3)-Co_(3)O_(4)system at 600℃are *** pre-reduction reaction belongs to the first-order reaction,and its equation is expressed as follows:r=-(dw_(WO_(3)))/dt=(9±0.15)×10^(-2)×P_(H_(2))^(0.44)P_(C_(2)H_(4))&(0.57)The carbon deposition rate equation of C_(2)H_(4) can be expressed as follows:r=-(dc_C)/dt=r_f-r_b≌7.35×10^(-2)×P_(C_(2)H_(4))^(0.31)

关键词： Fluidization WO_(3)-Co_(3)O_(4) Reduction Carbon deposition Rate equation

Trends in day-to-day variability of surface air temperature in China during 1961-2012

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Atmospheric and Oceanic Science Letters 2017年第2期10卷 122-129页

作者： li shang-feng JIANG Da-Bang liAN Yi YAO Yao-Xian Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Laboratory of Research for Middle-High Latitude Circulation Systems and East Asian Monsoon Institute of Meteorological Sciences of Jilin Province Changchun China College of Earth Science University of Chinese Academy of Sciences Beijing China Department of Science and Technology and Forecast of Jilin Meteorological Bureau Changchun China

Using daily mean, maximum, and minimum surface air temperature （abbreviated as Tmean, Tmax, and Tmin, respectively） data from CN05.2 and the Met Office Hadley Centre observation data-sets for 1961-2012, the trends in day-to-day variability of Tmean, Tmax, and Tmin （abbreviated as DVTFmean, DVTTmax, and DVTTmin, respectively） are examined. It is revealed that the annual trends of DVTTmean, DVTTmax, and DVTTmin are all negative in Northeast China （NEC）, and more obvious in North China than in South China. Seasonal trends of DVTTmean are also negative in NEC, except in summer. For DVTTmax, trends are generally more obvious than DVTTmin in all seasons in NEC; moreover, trends in spring are obvious in both the north and the south, but trends in summer and winter are more obvious in the southern region than in the northern part. As far as DVTT-Fmin is concerned, except in autumn, seasonal trends are more obvious in the north than in other regions of the country.

关键词： Day-to-day variability temperature trend China

基于PPARγ对糖转运及代谢的影响探讨罗格列酮对糖尿病小鼠胰腺癌模型的作用机制

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中国药理学通报 2024年第7期40卷 1325-1334页

作者：胡瑞萍尚利峰王和静车红霞王明亮杨欢靳媛媛张菲菲张建岭甘肃省第三人民医院甘肃兰州730000 青岛市第八人民医院山东青岛266121 兰州大学第一医院甘肃兰州730000

目的基于PPARγ对糖转运及代谢的影响探讨罗格列酮(rosiglitazone,Rsg)对糖尿病小鼠胰腺癌模型的作用机制。方法采用高脂高糖饮食+STZ建造T2DM模型;选择造模成功的T2DM小鼠和正常小鼠,建造PANC02细胞移植瘤模型。T2DM移植瘤小鼠和正常... 详细信息

目的基于PPARγ对糖转运及代谢的影响探讨罗格列酮(rosiglitazone,Rsg)对糖尿病小鼠胰腺癌模型的作用机制。方法采用高脂高糖饮食+STZ建造T2DM模型;选择造模成功的T2DM小鼠和正常小鼠,建造PANC02细胞移植瘤模型。T2DM移植瘤小鼠和正常移植瘤小鼠分组均为:Rsg;PPARγ抑制剂(PIN-2);Rsg+PPARγ抑制剂(Rsg+PIN-2),并分别以正常移植瘤小鼠(NDM)和T2DM移植瘤小鼠(DM)作为对照组。干预后取材;HE染色观察组织病理变化;免疫组化检测组织中Ki67和PCNA的表达;TUNEL检测细胞凋亡情况;免疫荧光检测PPARγ的表达;RT-PCR法测定Glucokinase、GLUT2、Nkx6.1、PDX-1 mRNA的表达;Western blot检测Glucokinase、GLUT2、Nkx6.1、PDX-1蛋白的表达。结果Rsg可使NDM和DM小鼠移植瘤质量、病理变化、Ki67和PCNA的表达均明显降低(P<0.05),细胞凋亡和PPARγ、Glucokinase、GLUT2、Nkx6.1、PDX-1表达均明显升高(P<0.05);PIN-2均可逆转Rsg导致的NDM和DM小鼠指标变化;与NDM小鼠比,DM组小鼠上述相关指标对Rsg和PIN-2更加敏感。结论相比于非糖尿病胰腺癌,Rsg可更加敏感地通过激活PPARγ抑制糖尿病胰腺癌的增殖,诱导其凋亡,并通过改变糖脂代谢基因,重编程胰腺癌代谢,进而达到抑癌的作用。

关键词：罗格列酮 PPARγ 2型糖尿病胰腺癌糖转运抑癌

Effect of electron beam irradiation on surface molecule and flashover voltage of epoxy composites

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High Voltage 2024年第3期9卷 528-536页

作者： Mingru li Huan Niu Kai shang Jianyu Lang Yafang Gao Bingnan li Jiuhui Zhao Zhen li Yang feng Shengtao li State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anShaanxiChina Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinHeilongjiangChina

The unsatisfactory insulating properties of solid–gas interfaces seriously restrict the development of high-voltage electrical equipment and threaten their power supply ***-beam irradiation(EBI)can effectively improve the surface flashover voltage of ***,the underlying mechanism of EBI in tailoring the surface trap and improving the flashover voltage remains *** this study,the surface morphologies and chemical compositions of epoxy composites treated with EBI were *** addition,the surface wetting properties,surface charge migration pa-rameters,and surface flashover voltages were experimentally *** was found that EBI aggravated the surface morphology,changed the surface chemical components,and repressed surface charge *** a result,the contact angle was reduced from 103.7°to 78.43°,and the flashover voltage in SF6 was increased from 35.26 to 38.90 *** calculations showed that the newly generated C–O–H and C=O bonds on the surface molecules after EBI formed charge centres at the molecular electrostatic potential,which enhanced the trapping effect of the surface deep *** a result,surface charge migration was repressed,and the surface flashover voltage was *** study could promote the further development of EBI on materials modification.

关键词： composites surface beam

F-doped orthorhombic Nb_(2)O_(5) exposed with 97% (100) facet for fast reversible liþ-Intercalation

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Green Energy & Environment 2024年第4期9卷 723-731页

作者： Xiaodi liu Yufeng Tang Dan Zhang Guangyin liu Xinwei Luo Yi shang Xiu li Jianmin Ma College of Chemistry and Pharmaceutical Engineering Nanyang Normal UniversityNanyang473061China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu611731China

Orthorhombic Nb_(2)O_(5)(T-Nb_(2)O_(5))is attractive for fast-charging li-ion batteries,but it is still hard to realize rapid charge transfer kinetics for li-ion ***,F-doped T-Nb_(2)O_(5) microﬂowers(F-Nb_(2)O_(5))are rationally synthesized through topotactic ***,F-Nb_(2)O_(5) are assembled by single-crystal nanoﬂakes with nearly 97%exposed(100)facet,which maximizes the exposure of the feasible li^(+)transport pathways along loosely packed 4g atomic layers to the electrolytes,thus effectively enhancing the li^(+)-intercalation ***,the band gap of F-Nb_(2)O_(5) is reduced to 2.87 eV due to the doping of F atoms,leading to enhanced electrical *** synergetic effects between tailored exposed crystal facets,F-doping,and ultrathin building blocks,speed up the li^(+)/electron transfer kinetics and improve the pseudocapacitive properties of F-Nb_(2)O_(5).Therefore,F-Nb_(2)O_(5) exhibit superior rate capability(210.8 and 164.9 mAh g^(-1) at 1 and 10 C,respectively)and good long-term 10 C cycling performance(132.7 mAh g^(-1) after 1500 cycles).

关键词： Exposed facets Orthorhombic Nb_(2)O_(5) F-doping Pseudocapacitive intercalation anode li-ion storage

Experimental quantum state compression from two identical qubits to a qutrit

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 1-5页

作者： Qiao Xu lin-Xiang Zhou Tian-feng feng shang-feng Qiu Si-Wu li Wu-Ji Zhang Hui Luo Xiao-Qi Zhou State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics Sun Yat-sen UniversityGuangzhou 510000China Hefei National Laboratory Hefei 230088China

In the realm of modern information technology,data compression technology occupies a pivotal *** advancements in quantum information technology,the need to compress large-scale qubits ensembles has become urgent,aiming to reduce the demand on quantum storage ***,existing quantum state compression schemes generally face a limitation:the particles before and after compression must reside in the same dimensional *** specific scenarios,compressing qubits into particles of higher dimensions not only enhances the efficiency of quantum state compression but also further reduces the usage of quantum storage *** we experimentally demonstrated a quantum state compression between particles of different dimensions,successfully compressing two qubits into a single *** average fidelity of the resulting qutrit with the ideal quantum state is *** study may have potential applications in future quantum information,such as increasing quantum communication bandwidth and reducing storage resource consumption in quantum computing.

关键词： quantum state compression quantum information technology optics

Impact of the Political Risk on Food Reserve Ratio:Evidence Across Countries

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Journal of Systems Science & Complexity 2024年第5期37卷 2071-2103页

作者： XING Kai li shang YANG Xiaoguang School of Economics&Management Nanchang UniversityNanchang330031China Department of Statistics and Data Science National University of Singapore119077Singapore Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100190China

Using an unbalanced panel data covering 75 countries from 1991 to 2019,the authors explore how the political risk impacts on food reserve *** empirical findings show that an increasing political risk negatively affects food reserve ratio,and the same effects hold for both internal risk and external ***,the authors find that the increasing external or internal risks both negatively affect food production and food exports,but external risk does not significantly impact food imports and it positively impacts food consumption,while internal risk negatively impacts food imports and food *** results suggest that most governments have difficulty raising subsequent food reserve ratios in face of an increasing political risk,no matter if it is an internal risk or an external risk although the mechanisms behind the impacts are different.

关键词： External risk food reserve ratio internal risk political risk

Dynamic modeling and RBF neural network compensation control for space flexible manipulator with an underactuated hand

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Chinese Journal of Aeronautics 2024年第3期37卷 417-439页

作者： Dongyang shang Xiaopeng li Meng YIN Fanjie li School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China

In space operation,flexible manipulators and gripper mechanisms have been widely used because of light weight and ***,the vibration caused by slender structures in manipulators and the parameter perturbation caused by the uncertainty derived from grasping mass variation cannot be *** existence of vibration and parameter perturbation makes the rotation control of flexible manipulators difficult,which seriously affects the operation accuracy of ***’s more,the complex dynamic coupling brings great challenges to the dynamics modeling and vibration *** solve this problem,this paper takes the space flexible manipulator with an underactuated hand(SFMUH)as the research *** dynamics model considering flexibility,multiple nonlinear elements and disturbance torque is established by the assumed modal method(AMM)and Hamilton’s principle.A dynamic modeling simplification method is proposed by analyzing the nonlinear ***’s more,a sliding mode control(SMC)method combined with the radial basis function(RBF)neural network compensation is ***,the control law is designed using a saturation function in the control method to weaken the chatter *** the help of neural networks to identify the uncertainty composition in the SFMUH,the tracking accuracy is *** results of ground control experiments verify the advantages of the control method for vibration suppression of the SFMUH.

关键词： Space flexible manipulator RBF neural network Underactuated hand Dynamic models Model simplification

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海洋平台膨胀型防火漆施工工艺研究

现代涂料与涂装 2024年第4期27卷 27-30+62页

作者：韩明恩李尚峰次仁美朵罗威威张庆宇海洋石油工程(青岛)有限公司

主要讨论了海洋平台建造过程中膨胀型防火漆的施工工艺，详细介绍了全流程过程中的质量控制点和管理重点，为海洋平台船舶、海洋平台、LNG类项目建造和维保期间防火漆的施工管理和质量控制提供借鉴和参考。

关键词：海洋平台膨胀型防火漆施工工艺