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红土镍矿高压酸浸高温预热器给料泵叶轮破坏案例分析

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有色设备 2024年第1期38卷 50-55页

作者：杨胜平潘竞香中国恩菲工程技术有限公司北京100038

本文针对某项目红土镍矿高压酸浸出系统在试车及试生产过程中高温预热器给料泵叶轮损坏的情况进行了过程调研和原因分析,找出了问题根源所在,为该问题的解决提供了可行性依据,并优化和完善现有的操作规程及试车方案,对工艺设计、设备选... 详细信息

本文针对某项目红土镍矿高压酸浸出系统在试车及试生产过程中高温预热器给料泵叶轮损坏的情况进行了过程调研和原因分析,找出了问题根源所在,为该问题的解决提供了可行性依据,并优化和完善现有的操作规程及试车方案,对工艺设计、设备选型、结构设计、材质选择等环节起到了一定性作用,为类似项目问题解决提供了指导和借鉴案例。

关键词：红土镍矿高温预热器给料泵过流件损坏机理改进提升

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基于高温矿浆隔膜泵过流件寿命改进研究

有色设备 2023年第6期37卷 16-23页

作者：杨胜平贺伟伟潘竞香中国恩菲工程技术有限公司北京100038

随着红土镍矿不断开发,对于低品位的镍矿采用高压酸浸绿色低成本技术逐步得到大规模推广,但如何实现高产、低耗控制,关键设备高运行率是前提条件,在湿法冶金高压浸出中关键设备高压釜隔膜泵的过流件寿命是直接影响产能和成本重要因素。... 详细信息

随着红土镍矿不断开发,对于低品位的镍矿采用高压酸浸绿色低成本技术逐步得到大规模推广,但如何实现高产、低耗控制,关键设备高运行率是前提条件,在湿法冶金高压浸出中关键设备高压釜隔膜泵的过流件寿命是直接影响产能和成本重要因素。本文介绍了现行的设备设计、运行、维护、改进等方面技术,对比了不同工况、不同材质等情况下过流件寿命,为后续红土镍矿项目设备选型及维护、改进提供了重要参考意义。

关键词：红土镍矿加压浸出过流件

考虑机构铰链非线性因素的混合键合图建模及其仿真

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机械传动 2010年第8期34卷 13-16,5页

作者：王艾伦潘竞香现代复杂装备设计与极端制造教育部重点实验室湖南长沙410083 中南大学机电工程学院湖南长沙410083

针对机构运动副中干摩擦和间隙同时存在,建模、计算比较复杂,利用开关键合图建立了铰链非线性模型,并将其以模块化的形式嵌入到机构矢量键合图建模当中,给出了考虑非线性因素的机构混合键合图模型;并以夹持机构为例进行分析,通过仿真得... 详细信息

针对机构运动副中干摩擦和间隙同时存在,建模、计算比较复杂,利用开关键合图建立了铰链非线性模型,并将其以模块化的形式嵌入到机构矢量键合图建模当中,给出了考虑非线性因素的机构混合键合图模型;并以夹持机构为例进行分析,通过仿真得出非线性因素对夹持机构动力学性能的影响,结果表明此方法能准确、简洁地描述考虑铰链非线性因素的机构动力学特性。

关键词：非线性干摩擦间隙开关键合图矢量键合图夹持机构

在京津冀协同发展背景下基本公共卫生服务支付方式改革探索——以冀地区H市为例

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中国煤炭工业医学杂志 2015年第10期18卷 1781-1784页

作者：潘景香河北省衡水市卫生局 053000

文章在京津冀协同发展的大背景下,以冀地区H市实行基本公共卫生服务支付方式改革经验为例,提出了在推进基本公共卫生服务项目支付方式改革过程中应考虑到的几项配套改革以及在改革过程中应注意的问题,确保在提高资金使用效益的同时使城... 详细信息

文章在京津冀协同发展的大背景下,以冀地区H市实行基本公共卫生服务支付方式改革经验为例,提出了在推进基本公共卫生服务项目支付方式改革过程中应考虑到的几项配套改革以及在改革过程中应注意的问题,确保在提高资金使用效益的同时使城乡居民公平享有安全、有效的基本公共卫生服务,为京津冀协同发展提供健康保障。

关键词：基本公共卫生服务支付方式改革

基于Malmquist指数的二级综合医院运行效率评价

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中国煤炭工业医学杂志 2015年第4期18卷 684-686页

作者：潘景香河北省衡水市卫生局 053000

目的对综合性二级医疗机构的全要素生产率变动及其分解情况进行研究。方法运用DEA的Malmquist指数模型分析某地区14家二级综合医院2009—2011年全要素生产率变化情况。结果 14家医院中有9家(65.7%)医院全要素生产率提高,5家(34.3%)医院... 详细信息

目的对综合性二级医疗机构的全要素生产率变动及其分解情况进行研究。方法运用DEA的Malmquist指数模型分析某地区14家二级综合医院2009—2011年全要素生产率变化情况。结果 14家医院中有9家(65.7%)医院全要素生产率提高,5家(34.3%)医院降低。有10家(71.4%)医院的全要素生产率的变化是技术变化和效率变化共同作用的结果,有4家(28.6%)医院主要受到技术变化的影响,5家生产率降低的医院中有3家医院表现为技术衰退。结论进一步提高医院的生产率,应把重点放在加强技术培训与创新上,加强医院内部管理,控制适宜的发展规模。

关键词：二组综合医院全要素生产率 Malmquist 指数医院管理

Mating system and progeny genetic diversity of Camellia oleifera ‘Ruan Zhi’

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Journal of Forestry Research 2019年第5期30卷 1805-1810页

作者： Zijie Zhang jingxiang Meng Daofeng pan Ci Yang Yue Li National Engineering Laboratory for Forest Tree Breeding Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of EducationCollege of Biology Science and TechnologyBeijing Forestry UniversityBeijing 100083People’s Republic of China Forestry Bureau of Sanjiang Dong Autonomous County Liuzhou 545500GuangxiPeople’s Republic of China Sanjiang Dong Autonomous County Bureau of Science and Technology Liuzhou 545500GuangxiPeople’s Republic of China

Camellia oleifera Abel.is an important economic tree species of southern China.In this study,we evaluated the mating system and genetic diversity of a series of cultivars of C.oleifera‘Ruan Zhi’.A total of 159 individuals from the progenies of four cultivars were tested by simple sequence repeat molecular markers.Results reveal that 11 pairs of primers showed polymorphism and their polymorphism information content value was greater than 0.73,suggesting that these primers could be used to identify the genetic diversity of open-pollinated populations.The average number of effective alleles(Ne=4.88)was significantly different from the average number of alleles(Na=12.18),and their distribution in the sample population was not uniform.The average observed heterozygosity(Ho=0.96)was greater than the average expected heterozygosity(He=0.79),and the population heterozygote was excessive.Shannon index was 1.84 and populations showed high genetic diversity.As regards to the mating system,the multilocus outcrossing rate was 0.996,and the single locus 0.866.These results indicate a high degree of outcrossing by C.oleifera‘Ruan Zhi’.We recommend selecting individuals for high genetic gain from the progenies of cultivars because of outcrossing characteristics and genetic diversity for application to germplasm conservation and promotion.

关键词： Camellia oleifera SSR markers Genetic diversity Mating system

Distribution and source of microplastics in China's second largest reservoir-Danjiangkou Reservoir

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Journal of Environmental Sciences 2021年第4期33卷 74-84页

作者： Li Lin Xiong pan Sheng Zhang Danwen Li Wenliang Zhai Zhen Wang jingxiang Tao Changqing Mi Qingyun Li John C.Crittenden Basin Water Environmental Research Department Changjiang River Scientific Research InstituteWuhanHubei 430010China Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province WuhanHubei 430010China School of Environmental Science and Technology Huazhong University of Science and TechnologyWuhanHubei 430074China Brook Byers Institute of Sustainable Systems School of Civil and Environmental EngineeringGeorgia Institute of TechnologyAtlantaGA 30332USA

Fresh water microplastic pollution is of pressing concern globally,but its distribution and sources in reservoirs are poorly documented.Danjiangkou Reservoir is the second largest reservoir in China and is divided into the Han Reservoir and Dan Reservoir.In this work,microplastic abundances and morphological characteristics of the reservoir were investigated.The microplastic abundance of 15 main tributaries of the reservoir was also measured.The vertical distribution(in water column and sediment),horizontal distribution(in Han Reservoir and Dan Reservoir)and source of microplastics were analyzed.Microplastics accumulated in the middle layer of the reservoir,and the size and color of the microplastic particles changed from the surface to the bottom,which implies that surveys of surface water are not enough to determine the microplastic contamination for deep water reservoirs.In the surface water,the microplastic abundance in the Han Reservoir was lower than that in the Dan Reservoir(p<0.05),but microplastic abundance did not differ significantly in the intermediate and bottom water.Tributaries were one of the main sources of microplastics for Han Reservoir but not for Dan Reservoir.Agricultural cultivation in the hydro-fluctuation belt might be an important source of microplastics in the Dan Reservoir,which should be given additional attention.The results of this study can provide valuable information for developing microplastic sampling strategies in deep water reservoirs.Further studies are recommended to investigate the process through which microplastics in the hydro-fluctuation belt enter the reservoir and the sinking behavior of microplastics in the reservoir.

关键词： Microplastic Vertical distribution Source Hydro-fluctuation belt Danjiangkou Reservoir

Working-in-tandem mechanism of multi-dopants in enhancing electrocatalytic nitrogen reduction reaction performance of carbon- based materials

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Nano Research 2021年第9期14卷 3234-3239页

作者： Wenqing Zhang Keke Mao jingxiang Low Hengjie Liu Yanan Bo Jun Ma Qiaoxi Liu Yawen Jiang Jiuzhong Yang Yang pan Zeming Qi Ran Long Li Song Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)School of Chemistry and Materials Scienceand National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230041China School of Energy and Environment Science Anhui University of TechnologyMaanshan 243032China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

Developing carbon-based electrocatalysts with excellent N2 adsorption and activation capability holds the key to achieve highly efficient nitrogen reduction reaction(NRR)for reaching its practical application.Here,we report a highly active electrocatalyst--metal-free pyrrolic-N dominated N,S co-doped carbon(pyrr-NSC)for NRR.Based on theoretical and experimental results,it is confirmed that the N and S-dopants practice a working-in-tandem mechanism on pyrr-NSC,where the N-dopants are utilized to create electropositive C sites for enhancing N2 adsorption and the S-dopants are employed to induce electron backdonation for facilitating N2 activation.The synergistic effect of the pyrrolic-N and S-dopants can also suppress the irritating hydrogen evolution reaction,further boosting the NRR performance.This work gives an indication that the combination of two different dopants on electrocatalyst can enhance NRR performance by working in the two tandem steps-the adsorption and activation of N2 molecules,providing a new strategy for NRR electrocatalyst design.

关键词： N2 reduction reaction metal-free catalyst heteroatoms doping asymmetric charge distribution electrocatalysis

泄洪对典型有机污染物迁移转化行为的影响--以丹江口水库为例

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湖泊科学 2022年第1期34卷 108-117页

作者：张胜苏紫颖林莉陶晶祥潘雄董磊长江科学院流域水环境研究所武汉430010 流域水资源与生态环境科学湖北省重点实验室武汉430010 河海大学环境学院南京210098

随着高坝水库的建设,大坝泄洪雾化对生态环境的影响已得到较多研究,而泄洪雾化对污染物迁移转化行为的影响尚未引起关注.本研究于2019年对丹江口大坝泄洪期间坝前和坝下多个断面进行了采样调查,分析了水体中16种多环芳烃(PAHs)和6种邻... 详细信息

随着高坝水库的建设,大坝泄洪雾化对生态环境的影响已得到较多研究,而泄洪雾化对污染物迁移转化行为的影响尚未引起关注.本研究于2019年对丹江口大坝泄洪期间坝前和坝下多个断面进行了采样调查,分析了水体中16种多环芳烃(PAHs)和6种邻苯二甲酸酯(PAEs)的浓度.发现泄洪后坝下水体中检测出的8种PAHs和5种PAEs浓度相比于坝前总体上均呈现沿程降低趋势,与坝前断面相比,PAHs在坝下1、5和10 km处的浓度下降比例范围分别为8.1%~100%、26.2%~100%和36.7%~100%,均值为34.6%、64.8%和75.7%;对应的PAEs浓度下降比例范围分别为0.9%~38.7%、33.7%~71.8%和61.1%~87.5%,均值为21.5%、47.0%和71.3%.基于野外观测结果,从理论上推测分析了大坝泄洪雾化影响坝下水体PAHs和PAEs迁移转化的途径和作用机制,包括污染物的化学氧化、光降解和吸附等.本研究对于开展泄洪雾化条件下水体中污染物迁移转化行为研究具有借鉴意义.

关键词：泄洪雾化有机污染物迁移转化光降解溶解氧丹江口水库