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Making waste profitable: Efficient recovery of metallic iron from jarosite residues

Chinese Journal of Chemical Engineering 2024年第7期71卷 66-76页

作者： Songshan Zhou Yunhui Han Rong Huang Yin Huang Qingyuan Dong Haiyin Gang jinchuan Qin Xi Yu Xiangfei Zeng Wenxing Cao Jiqin Wang Shaoqin chen Rong Wang Mengjun chen Key Laboratory of Solid Waste Treatment and Resource Recycle(SWUST) Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China School of Environment Key Laboratory of Yellow River and Huai River Water Environment and Pollution ControlMinistry of EducationHenan Normal UniversityXinxiang 453007China School of National Defense Science and Technology College SWUST Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China

To address the hazardous by-product of zinc smelting and resource utilization of jarosite residue,this study applies an electric field-assisted hot acid treatment to completely recycle iron(Fe).This innovative approach aims to enhance the leaching efficiency of Fe from jarosite *** introduction of an electric field changes the charge distribution on the surface of the particles to enhance ions and electrons exchange and promotes the collision between particles to strengthen reaction *** on the above,the leaching efficiency of Fe in jarosite under sulfuric acid attack has improved *** result shows that Fe leaching efficiency reaches 98.83%,which is increased by 28%under the optimal experimental conditions:current density of 30 mA·cm^(-2),H_(2)SO_(4) concentration of 1.5 mol·L^(-1),solid-liquid ratio of 70 g·L^(-1),temperature of 80℃ and time of 12 *** kinetics calculations show that the apparent activation energy is 16.97 kJ·mol^(-1) and the leaching of jarosite residue is controlled by a mixture of chemical reaction and diffusion,as well as the temperature and concentration of the leaching solution have an influence on *** work provides a feasible idea for the efficient leaching of Fe from jarosite residue.

关键词： Jarosite residue Electric filed Leaching kinetics

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微信公众号教学病例对核医学住院医师规范化培训的作用及思考

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中华医学教育探索杂志 2023年第5期22卷 741-744页

作者：赵赟赟李河北王茜高平陈津川郝科技李原邱李恒岳明纲北京大学人民医院核医学科北京100044

为助力核医学住院医师规范化培训,北京大学人民医院核医学住院医师规范化培训专业基地联合国内45家教学医院的核医学科,建立了“核医学住院医规培”微信公众号,并以每周一期的频率按时发布教学病例。其弥补了单一培训基地教学病例不足... 详细信息

为助力核医学住院医师规范化培训,北京大学人民医院核医学住院医师规范化培训专业基地联合国内45家教学医院的核医学科,建立了“核医学住院医规培”微信公众号,并以每周一期的频率按时发布教学病例。其弥补了单一培训基地教学病例不足的缺点,强化了住院医师影像诊断思维训练,促进了各基地之间的相互学习。通过撰写教学病例,指导教师和住院医师开拓了思路、增长了知识、提高了自学能力。借助微信公众号灵活实用的特点,加强了住院医师学习的自觉性和可持续性。

关键词：核医学住院医师规范化培训微信公众号

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Intrinsic and scattering attenuations of the Sichuan-Yunnan region in China from S coda waves

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Earthquake Science 2024年第1期37卷 51-66页

作者： Tian Li Lei Zhang Xiaodong Song Qincai Wang Xinyu Jiang jinchuan Zhang Hanlin chen SinoProbe Laboratory School of Earth and Space SciencesPeking UniversityBeijing 100871China Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards Peking UniversityBeijing 100871China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Earthquake Agency of Jiangsu Province Nanjing 210014China

Seismic attenuation is a fundamental property of the Earth's *** structure for the complicated geological structures with strong seismicity in the Sichuan-Yunnan region is poorly *** this study,we collected 108,399 waveforms of 11,517 local small earthquakes with magnitudes between 1.5 and 3.5 from January 2014 to September 2021 in the Sichuan-Yunnan region and its adjacent *** employed an envelope inversion technique for separating the intrinsic and scattering attenuations of the S coda wave,and obtained the intrinsic and scattering attenuation structures for frequencies between 0.25 and 8.00 *** attenuation structures correlate well with the geological units,and some major faults mark the attenuation variations where historic large earthquakes have *** regional average attenuation shows a negative frequency *** average scattering attenuation has a faster descending rate than the average intrinsic attenuation,and is dominant at low frequencies,while at high frequencies the average intrinsic attenuation is *** lateral variation in the intrinsic attenuation is consistent with the variation in heat flow,the scattering attenuation may be related to the scatter distribution and *** total attenuation is consistent with the previous studies in this region,and the separate intrinsic and scattering attenuation may be useful in understanding regional tectonics and important in earthquake prevention and disaster reduction.

关键词： Intrinsic attenuation scattering attenuation Sichuan-Yunnan region

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Review of and prospects for China＇s human and economic geography

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Journal of Geographical Sciences 2017年第12期27卷 1556-1576页

作者： chen Mingxing LONG Hualou WANG chengjin HUANG jinchuan NIU Fangqu Institute of Geographic Sciences and Natural Resources Research CASBeijing 100101China Key Laboratory of Regional Sustainable Development Modeling CASBeijing 100101China

The ＂High-Level Forum of the Development of China＇s Human Geography Under the Background of Change＂ was held in Beijing on January 22-23, 2016. More than 30 pro-fessors attended this forum. At this conference, they discussed the major progress made towards developing China＇s human geography, as well as the existing problems, limiting fac- tors, opportunities, international collaborations, emerging directions, and prospects in the development of this discipline. In recent years human geography has boomed, generating many important opportunities for its development. Establishing an academic community for joint research on major research issues and collaborative innovation is a promising and im- portant route to take. We should embrace both domestic and international characteristics, to promote China＇s human geography onto the world stage. Meanwhile, the cultivation of vari- ous scholarly talents is also of great value to enrich and advance the discipline.

关键词： human and economic geography research review prospects High-Level Forum

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InAs-based interband cascade lasers at 4.0 μm operating at room temperature

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Journal of Semiconductors 2018年第11期39卷 36-39页

作者： Tian Yu Shuman Liu jinchuan Zhang Bo Xu Lijun Wang Junqi Liu Ning Zhuo Shenqiang Zhai Xiaoling Ye Yonghai chen Fengqi Liu Zhanguo Wang Key Laboratory of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences

InAs-based interband cascade lasers（ICLs） with InAs plasmon waveguides or InAs/AlSb superlattice（SL） waveguides were demonstrated at emission wavelengths below 4.1 μm. The threshold current densities of the lasers with SL waveguides were 37 A/cm;at 77 K in continuous wave mode. The operation temperature of these lasers reached room temperature in pulsed mode. Compared with the thick InAs n++ plasmon cladding layer, the InAs/AlSb superlattice cladding layers have greater advantages for ICLs with wavelengths less than 4 μm even in InAs based ICLs because in the short-wavelength region they have a higher confinement factor than InAs plasmon waveguides.

关键词： interband cascade laser InAs-based InAs/AlSb superlattice

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High-power distributed feedback lasers based on InP corrugated sidewalls atλ~2μm

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Photonics Research 2023年第8期11卷 1390-1396页

作者： YONGQIANG SUN YUNFEI XU jinchuan ZHANG FENGMIN chen JUNQI LIU SHUMAN LIU QUANYONG LU NING ZHUO LIJUN WANG FENGQI LIU SHENQIANG ZHAI Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsBeijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Academy of Quantum Information Sciences Beijing 100193China

We report a high-power single-mode InP-based 2μm distributed feedback(DFB)laser with a second-order buried grating and corrugated sidewalls.A second-order semiconductor grating is used for in-plane feedback and vertical *** corrugated sidewalls are used to eliminate higher-order transverse *** the DFB laser with a 2 mm long cavity and 15μm wide ridge,the maximum continuous-wave edge-emitting and surface-emitting single-mode powers at 300 K are up to 81 and 42 m W,respectively.A single-lobed far-field radiation pattern with a low divergence angle of approximately 8.6°is achieved by a device with a ridge width of 15μ*** single-longitudinal-mode emission wavelength of the fabricated laser can be adjusted from2003.8 nm at 288 K to 2006.9 nm at 313 K without any mode *** single-mode emission with a side-mode suppression ratio of 30 dB is achieved under all injection currents and temperature conditions.

关键词： 2μm power walls

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中国城市群等级类型综合划分

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地理科学进展 2015年第3期34卷 290-301页

作者：黄金川陈守强中国科学院区域可持续发展分析与模拟重点实验室中国科学院地理科学与资源研究所北京100101 中国科学院大学北京100049

城市群是中国新型城镇化战略的重要载体,也是国家参与全球竞争和国际劳动分工的新型地域单元。目前,中国区域空间治理模式正在发生重大转变,由原来的行政区分割管理开始转向类型区空间治理。本文基于城市群的重要外延特征,采用"先分等... 详细信息

城市群是中国新型城镇化战略的重要载体,也是国家参与全球竞争和国际劳动分工的新型地域单元。目前,中国区域空间治理模式正在发生重大转变,由原来的行政区分割管理开始转向类型区空间治理。本文基于城市群的重要外延特征,采用"先分等、后划类"的综合分类思想对中国23个城市群进行定量类型划分和空间分异分析,为中国城市群实施因地制宜的空间格局优化和分类管理的规划引导提供科学依据。首先,参考世界成熟城市群的规模大小和集聚程度,中国城市群分为国家级、区域级、次区域级和地区级4个等级,呈现"3-5-6-9"的金字塔型等级结构;其次,基于城市群的五大特征,构建由10个因子和22个指标构成的指标体系,运用Q型聚类分析法将中国城市群定量划分为成熟外向型、双核赶超型、环境友好型、单核辐射型和内陆粗放型等5种类型;最后,综合等级划分与定量聚类结果,进一步细分为国家级成熟外向型、国家级双核赶超型、区域级双核赶超型、次区域级环境友好型、地区级环境友好型、区域级单核辐射型、地区级单核辐射型、区域级内陆粗放型和地区级内陆粗放型共9个亚类。

关键词：城市群指标体系聚类分析空间分异等级划分中国

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高超声速飞行器平稳滑翔弹道设计方法

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北京航空航天大学学报 2015年第8期41卷 1464-1475页

作者：胡锦川陈万春北京航空航天大学宇航学院北京100191

针对已知攻角和倾侧角的高超声速飞行器平衡滑翔再入问题,提出了满足纵向加速度变化率最小的平稳滑翔弹道概念,并给出了平稳滑翔弹道设计方法.首先采用正则摄动的方法对高度动态微分方程进行求解,获得了精度较高的平稳滑翔高度、弹道倾... 详细信息

针对已知攻角和倾侧角的高超声速飞行器平衡滑翔再入问题,提出了满足纵向加速度变化率最小的平稳滑翔弹道概念,并给出了平稳滑翔弹道设计方法.首先采用正则摄动的方法对高度动态微分方程进行求解,获得了精度较高的平稳滑翔高度、弹道倾角和纵向加速度解析解.然后对平稳滑翔弹道的动态特性进行了分析,结果表明该弹道具有自然稳定性和弱阻尼性.进一步给出了弹道振荡的自然频率和阻尼表达式,其中自然频率仅与速度相关,而阻尼则与速度和纵向升阻比相关.最后,通过比较高度偏差的比例反馈、微分反馈和比例+微分反馈3种方案,得出纯微分反馈是实现平稳滑翔的最佳方案,并给出了定阻尼微分反馈系数的表达式.仿真校验表明:该方案具有控制平滑、弹道振荡收敛速度快及鲁棒性好等特点.

关键词：平稳滑翔弹道解析解正则摄动动态特性自然频率微分反馈

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城市群空间发育范围识别方法综述

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地理科学进展 2015年第3期34卷 313-320页

作者：陈守强黄金川中国科学院地理科学与资源研究所区域可持续发展分析与模拟重点实验室北京100101 中国科学院大学北京100049

城市群既是城市区域化的重要表现形式,也是区域工业化和城镇化发展到高级阶段的标志性产物。本文基于城市群多元化的概念演进历程,以城市群识别的技术方法和手段为主线,详细梳理了国内外学者对城市群发育范围划分和界定的研究历程,认为... 详细信息

城市群既是城市区域化的重要表现形式,也是区域工业化和城镇化发展到高级阶段的标志性产物。本文基于城市群多元化的概念演进历程,以城市群识别的技术方法和手段为主线,详细梳理了国内外学者对城市群发育范围划分和界定的研究历程,认为"概念本质的认识、界定标准的设定、最小分析单元的选用和识别方法的选择"是学术界对城市群空间范围识别难以共识的主要原因;理清了城市群空间发育范围识别和界定的研究脉络:以美国都市区划分为代表的传统社会经济指标法影响深远,奠定了西方国家关于城市群发育范围识别和界定的研究基调;采用引力模型对中心城市辐射范围划分成为当前中国城市群发育范围划分的主流;在明确识别对象的基础上,以GIS空间分析技术为手段,综合指标和模型多种方法为一身的集成模拟法,代表了城市群空间发育范围识别和界定研究的未来趋势。

关键词：城市群范围识别空间界定研究进展

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Quantum cascade superluminescent light emitters with high power and compact structure

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Journal of Semiconductors 2020年第1期41卷 78-82页

作者： Jialin Sun Chuncai Hou Hongmei chen jinchuan Zhang Ning Zhuo Jiqiang Ning Changcheng Zheng Zhanguo Wang Fengqi Liu Ziyang Zhang School of Nano Technology and Nano Bionics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China The 718th Research Institute of China Shipbuilding Industry Corporation Handan 056027China Key Laboratory of Nanodevice and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Division of Natural and Applied Sciences Duke Kunshan UniversityKunshan 215316China

Quantum cascade(QC)superluminescent light emitters(SLEs)have emerged as desirable broadband mid-infrared(MIR)light sources for growing number of applications in areas like medical imaging,gas sensing and national ***,it is challenging to obtain a practical high-power device due to the very low efficiency of spontaneous emission in the intersubband transitions in QC *** a design of^5μm SLEs is demonstrated with a two-phonon resonancebased QC active structure coupled with a compact combinatorial waveguide structure which comprises a short straight part adjacent to a tilted stripe and to a J-shaped *** as-fabricated SLEs achieve a high output power of 1.8 mW,exhibiting the potential to be integrated into array devices without taking up too much chip *** results may facilitate the realization of SLE arrays to attain larger output power and pave the pathway towards the practical applications of broadband MIR light sources.

关键词： quantum cascade superluminescent diode mid-wave infrared

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