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Effects of co-precipitation temperature on structure and properties of La and Y doped cerium zirconium mixed oxides

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Transactions of Nonferrous Metals Society of China 2022年第2期32卷 618-628页

作者： Lian-jie ZHANG Mei-sheng CUI Hao WANG Yong-ke HOU Shi-lei CHEN zhi-zhe ZHAI zhi-qi long Yong-qi ZHANG National Engineering Research Center for Rare Earth GRINM Group Co.Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China GRIREM Hi-Tech Co. Ltd.Langfang 065201China

Due to the oxygen storage and release properties,cerium zirconium mixed oxides are recognized as the key material in automotive three-way *** reveal the effects of co-precipitation temperature on structure,physical and chemical properties of multi-doped cerium zirconium mixed oxides,a series of La and Y doped cerium zirconium mixed oxides(CZLYs)were synthesized via a co-precipitation method,and the physical and chemical properties of CZLYs were systemically characterized by XRD,N_(2) adsorption−desorption,TEM,XPS,oxygen storage capacity(OSC)and hydrogen temperature programmed reduction(H_(2)-TPR).The results show that co-precipitation temperature is an important parameter to influence the crystal size,oxygen storage capacity and thermal stability of *** the co-precipitation temperature was 60℃,the best redox properties and thermal stability of CZLYs were *** thermal treatment at 1100℃for 10 h,the specific surface area and oxygen storage capacity of the corresponding aged sample were 15.42 m^(2)/g and 497.7μmol/g,*** addition,a mechanism was proposed to reveal the effects of co-precipitation temperature on the structure and properties of CZLYs.

关键词： La and Y doping cerium zirconium mixed oxides co-precipitation temperature crystal size thermal stability

Leaching behaviors of calcium and magnesium in ion-adsorption rare earth tailings with magnesium sulfate

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Transactions of Nonferrous Metals Society of China 2021年第1期31卷 288-296页

作者： Bo FAN long-sheng ZHAO Zong-yu FENG De-peng LIU Wei-qiang YIN zhi-qi long Xiao-wei HUANG National Engineering Research Center for Rare Earth Materials GRINM Group Co.Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China Grirem Advanced Materials Co. Ltd.Beijing 100088China

The leaching behaviors of calcium and magnesium in the rare earth tailings leached with magnesium sulfate using deionized water,CaCl2 solution and lime water were *** data indicated that magnesium in the tailings was easy to be leached out since most of the magnesium was in the form of water-soluble *** of calcium in the lime water was electrostatically adsorbed on the clay mineral of the tailings,and the water-soluble magnesium was also gradually converted into exchangeable phase because of back-adsorption of Mg2+on the clay mineral with increasing the pH *** the liquid-to-solid ratio was 0.80,the contents of readily-available magnesium and calcium were 104.4−207.6 and 201.7−1426.3 mg/kg,respectively,which could meet the requirements for *** results suggest a promising route for the environmental remediation of ion-adsorption rare earth ore after in-situ leaching.

关键词： ion-adsorption rare earth ore magnesium sulfate environmental remediation leaching behaviors lime water

中国现代文学起点探寻——从维新变法看中国现代文学变革的趋势

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河南科技大学学报（社会科学版） 2014年第6期32卷 55-58页

作者：祁志龙广西师范大学文学院广西桂林541006

中国现代文学的起点,学界普遍认为始于五四文学革命,但是近年来国内外有关学者通过多方面研究,提出了不同的见解。纵观19世纪末至20世纪20年代的历史进程,处在世纪之交的戊戌变法运动有鲜明的时代意义,它的出现对于文学的变革亦起到至... 详细信息

中国现代文学的起点,学界普遍认为始于五四文学革命,但是近年来国内外有关学者通过多方面研究,提出了不同的见解。纵观19世纪末至20世纪20年代的历史进程,处在世纪之交的戊戌变法运动有鲜明的时代意义,它的出现对于文学的变革亦起到至关重要的作用。探究这一时期文学变革中所蕴含的现代因素不难发现,将现代文学的起点前移至维新变法是有依据的,并且能更进一步拓展现代文学的研究范围。

关键词：现代文学维新变法文学变革

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基于乡村振兴战略背景下的农村公路建设研究

工程建设与设计 2020年第14期 122-123页

作者：起志龙云南省楚雄州交通投资开发有限公司云南楚雄675000

城乡一体化建设的落实与推进对农村公路建设有促进的作用.论文从乡村振兴战略角度出发,对农村公路建设进行分析研究,希望为相关人员提供参考.

关键词：乡村振兴农村公路建设策略

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农村公路水泥路面常见病害的养护措施

工程建设与设计 2018年第2期 129-130页

作者：起志龙云南省永仁县地方公路管理段云南永仁651400

随着我国农村经济的飞速发展,农村公路承受的压力也逐渐增大,因此,农村公路的养护工作也引起了人们的关注。我国农村公路主要以水泥混凝土路面为主,在使用过程中出现许多常见病害。因此,论文在分析农村公路水泥路面常见病害的基础上,提... 详细信息

随着我国农村经济的飞速发展,农村公路承受的压力也逐渐增大,因此,农村公路的养护工作也引起了人们的关注。我国农村公路主要以水泥混凝土路面为主,在使用过程中出现许多常见病害。因此,论文在分析农村公路水泥路面常见病害的基础上,提出了针对性的养护措施,希望能为提高我国农村公路水泥路面的使用寿命提供参考。

关键词：农村公路水泥路面常见病害养护措施

Endoplasmic reticulum stress and autophagy in cerebral ischemia/reperfusion injury:PERK as a potential target for intervention

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Neural Regeneration Research 2025年第5期20卷 1455-1466页

作者： Ju Zheng Yixin Li Ting Zhang Yanlin Fu Peiyan long Xiao Gao Zhengwei Wang zhizhong Guan Xiaolan qi Wei Hong Yan Xiao Key Laboratory of Endemic and Ethnic Diseases Ministry of Education&Key Laboratory of Medical Molecular Biology of Guizhou ProvinceGuizhou Medical UniversityGuiyangGuizhou ProvinceChina Guizhou Center for Disease Control and Prevention GuiyangGuizhou ProvinceChina Department of Histology and Embryology Guizhou Medical UniversityGuiyangGuizhou ProvinceChina Collaborative Innovation Center for Prevention and Control of Endemic and Ethnic Regional Diseases Co-constructed by the Province and Ministry GuiyangGuizhou ProvinceChina

Several studies have shown that activation of unfolded protein response and endoplasmic reticulum(ER)stress plays a crucial role in severe cerebral ischemia/reperfusion *** occurs within hours after cerebral ischemia,but the relationship between ER stress and autophagy remains *** this study,we established experimental models using oxygen-glucose deprivation/reoxygenation in PC12 cells and primary neurons to simulate cerebral ischemia/reperfusion *** found that prolongation of oxygen-glucose deprivation activated the ER stress pathway protein kinase-like endoplasmic reticulum kinase(PERK)/eukaryotic translation initiation factor 2 subunit alpha(e IF2α)-activating transcription factor 4(ATF4)-C/EBP homologous protein(CHOP),increased neuronal apoptosis,and induced ***,inhibition of ER stress using inhibitors or by si RNA knockdown of the PERK gene significantly attenuated excessive autophagy and neuronal apoptosis,indicating an interaction between autophagy and ER stress and suggesting PERK as an essential target for regulating *** autophagy with chloroquine exacerbated ER stress-induced apoptosis,indicating that normal levels of autophagy play a protective role in neuronal injury following cerebral ischemia/reperfusion *** from this study indicate that cerebral ischemia/reperfusion injury can trigger neuronal ER stress and promote autophagy,and suggest that PERK is a possible target for inhibiting excessive autophagy in cerebral ischemia/reperfusion injury.

关键词： apoptosis ATF4 autophagy C/EBP homologous protein cerebral ischemia/reperfusion injury eIF2α endoplasmic reticulum stress PERK

Kinetics of rare earth leaching from roasted ore of bastnaesite with sulfuric acid

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Transactions of Nonferrous Metals Society of China 2013年第3期23卷 849-854页

作者：冯兴亮龙志奇崔大立王良士黄小卫张国成北京有色金属研究总院稀土材料国家工程研究中心北京100088 有研稀土新材料股份有限公司北京100088

Sulfuric acid leaching process was applied to extracting rare earth（RE） from roasted ore of Dechang bastnaesite in Sichuan,*** effect of particle size,stirring speed,sulfuric acid concentration and leaching temperature on RE extraction efficiency was investigated,and the leaching kinetics of RE was *** selected leaching conditions,including particle size（0.074-0.100 mm）,sulfuric acid concentration 1.50 mol/L,mass ratio of liquid to solid 8 and stirring speed 500 r/min,the leaching kinetics analysis shows that the reaction rate of leaching process is controlled by diffusion through the product/ash layer which can be described by the shrinking-core model,and the calculated activation energy of 9.977 kJ/mol is characteristic for a diffusion-controlled process.

关键词： bastnaesite rare earth roasting ore leaching kinetics

新疆布尔津县冲乎尔盆地地热资源水化学特征及地下热水成因分析

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地下水 2024年第1期46卷 52-55页

作者：喜英张同良齐志龙新疆地质矿产勘查开发局第一水文工程地质大队新疆乌鲁木齐830091 新疆工程学院地热研究中心新疆乌鲁木齐830023

以冲乎尔镇为中心,探明新疆布尔津县冲乎尔盆地地热资源,运用舒卡列夫分类和派珀三线图解分类,通过对比和分析不同区域地下水组分和化学特征,探讨了地热水的来源和成因。结果表明,冲乎尔盆地水化学类型为HCO_(3)-Ca·Mg、HCO_(3)·SO_(4... 详细信息

以冲乎尔镇为中心,探明新疆布尔津县冲乎尔盆地地热资源,运用舒卡列夫分类和派珀三线图解分类,通过对比和分析不同区域地下水组分和化学特征,探讨了地热水的来源和成因。结果表明,冲乎尔盆地水化学类型为HCO_(3)-Ca·Mg、HCO_(3)·SO_(4)-Mg·Ca·Na、HCO_(3)-Ca·Mg型;地下水的δ^(18)O和δD值均在大气降水线附近,说明其补给源均为大气降水;根据对冲乎尔盆地水点进行碳-14年代测定,发现地下水年龄在95~1460 a之间,属于深循环地下水;热储属于带状热储,热交换温度为68.9℃~73.9℃,说明研究区基础温度较高具有较大的开发潜力。冲乎尔盆地地下水通过大气降水入渗水后必然顺构造裂隙向深部运动,经过深循环大地热流加热密度降低,再通过深大断裂上涌,形成地热水。

关键词：冲乎尔盆地水文地球化学特征地热水热储成因分析

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一种2FSK非相干盲解调系统设计

无线电工程 2015年第4期45卷 29-31页

作者：李帅李辉漆志龙陈祎电子科技大学电子工程学院四川成都611731 国家电网四川省电力公司泸州供电公司四川泸州646000

针对复杂电磁环境下通信侦察接收机侦收的通信信号难以被准确解调的问题,在传统差分解调算法的基础上设计出一种2FSK信号非相干盲解调算法。该算法利用估计的载波频率将信号下变频到准基带,通过差分解调算法解调出基带信号,利用基于码... 详细信息

针对复杂电磁环境下通信侦察接收机侦收的通信信号难以被准确解调的问题,在传统差分解调算法的基础上设计出一种2FSK信号非相干盲解调算法。该算法利用估计的载波频率将信号下变频到准基带,通过差分解调算法解调出基带信号,利用基于码元跳变点的定时同步算法完成实时解调处理。仿真结果表明,该算法抗噪声与载频估计误差性能好,当SNR≥4 d B时,解调算法的误码率(BER)小于1%。

关键词：通信侦察 2FSK盲解调位同步误码率