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Super-high bed sintering for iron ores:behaviors,causes and solutions of horizontal segregation on strand

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Journal of Iron and Steel Research International 2024年第7期31卷 1590-1596页

作者： Liang-ping Xu hui-bo Liu Zhong-lin Dong Qiang Zhong Yu-chao Zhao Guang-hui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Horizontal segregation has been a constraint to the development and application of super-high bed *** eliminate the horizontal segregation of super-high bed sintering,several typical sintering machines were sampled and analyzed,and theoretical calculation was made to compare the bed depth and their differences in different areas within the mixture ***,solutions were proposed and applied to a 265 m^(2) sintering *** results showed that the horizontal seg-regation of the 265 m^(2) sintering machine was dominated by particles larger than 8 mm with horizontal segregation degree of 0.48,while 360 and 550 m^(2) sintering machines were affected by 5-8 mm and 1-3 mm particles with horizontal segregation degree of 0.27 and 0.31,*** analysis indicated the different segregation distribution results from the matching of the bed depth of each area within the mixture ***,the horizontal segregation degree not larger than 0.06 was achieved by optimizing the time parameters and the division of three zones on the 265 m^(2) sintering machine.

关键词： Super-high bed sintering Horizontal segregation Feeder Particle distribution Agglomeration

Super-high bed sintering for iron ores:problems ascertainment

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Journal of Iron and Steel Research International 2024年第5期31卷 1063-1070页

作者： Liang-ping Xu hui-bo Liu Yu-chao Zhao Qiang Zhong Zhong-lin Dong Guang-hui Li Tao Jiang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina

Super-high bed sintering process is an important development direction of iron ore sintering for its lower emission and higher ***,there is a lack of deep understanding of the uneven quality of super-high bed sintering products,and the deterioration of reduction disintegration performance,the thickening of hearth layer and the reduction in energy-saving effect are perplexing enterprises and *** ascertain the problems of super-high bed sintering,ten sintering machines with the areas of 265,280,360,550 and 660 m^(2)and bed depth above 900 mm were sampled and *** results showed that problems were mainly shown in the unevenness of chemical composition,macrostructure,mechanical strength and metallurgical *** chemical composition exhibits severe segregation in both horizontal and vertical directions,with basicity segregation reaching as high as *** uneven macrostructure of sinter is reflected in a 10%difference in porosity and mechanical strength increase in 16%–19%along the vertical *** reducibility and reduction disintegration performance gradually deteriorate along the bed depth,with a difference of 10.5%in reducibility and 7.3%in RDI−0.5 mm(reduction disintegration index of sinter with size smaller than 0.5 mm).

关键词： Super-high bed sintering Uneven sinter performance Segregation Agglomeration Iron ore

Rheology of continental lithosphere and seismic anisotropy

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Science China Earth Sciences 2024年第1期67卷 31-60页

作者： Shengsi SUN Yunpeng DONG Yixi LI Yihai YANG Chao CHENG bo hui Bin ZHANG Rutao ZANG State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China Shaanxi Earthquake Agency Xi’an 710068China

Rheology of rocks controls the deformation of the Earth at various space-time scales,which is crucial to understand the tectonic evolution of continental *** of rock rheology are mainly conducted via high-pressure and hightemperature rheological experiments and multi-scale observations and measurements of naturally deformed *** present,a large amount of data from such kinds of studies have been *** paper first provides an up-to-date comprehensive review of the rheological mechanisms,fabric types and seismic properties of the main rock-forming minerals at different depths of continental lithosphere,including olivine,orthopyroxene,clinopyroxene,amphibole,plagioclase,quartz and ***,progress in high-pressure and high-temperature experiments and natural deformation observations is introduced,mainly regarding the rheological strength and behavior,seismic velocity and anisotropy of lithospheric mantle peridotite,eclogite,mafic granulite,amphibolite and felsic ***,by taking the Tibetan Plateau as an example,the application of rock rheology for quantitative interpretation of seismic anisotropy data is *** combination of mineral deformation fabrics and seismic anisotropy is expected to make an important breakthrough in understanding the rheological properties and structure of continental lithosphere.

关键词： Lithosphere Mineral fabric Rheology Seismic velocity Anisotropy

Eco-friendly calcium alginate microspheres enable enhanced profile control and oil displacement

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Petroleum Science 2024年第3期21卷 1928-1943页

作者： Xiao-Han Zhang Chang-Jing Zhou Yuan-Xiang Xiao bo hui Yong-Gang Xie Yu-Bin Su Xin-Ru Li Jie Huang Mao-Chang Liu International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an710049ShaanxiPR.China Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs School of Petroleum EngineeringXi'an Shiyou UniversityXi'an 710065ShaanxiPR.China Oil&Gas Technology Research Institute Changqing Oilfield Branch CompanyPetroChinaXi'an710021ShaanxiPR China Suzhou Academy of Xi'an Jiaotong University Suzhou215123JiangsuPR China

Polymer microspheres(PMs),such as polyacrylamide,have been widely applied for enhanced oil recovery(EOR),yet with environmental ***,we report a microfluid displacement technology containing a bio-based eco-friendly material,i.e.,calcium alginate(CaAlg)microspheres for *** dominant mechanisms responsible for EOR over Ca Alg fluid have been verified,including the microscopic oil displacement efficacy augmented by regulating capillary force(determined by the joint action of interfacial tension and wettability between different phases)and macroscopic sweep volume increment through profile control and mobility ratio *** comprehensive effectiveness can be further impacted when the CaAlg microsphere is embellished ulteriorly by using appropriate amount of sodium dodecyl sulfonate(SDS).The core flooding and nuclear magnetic resonance(NMR)tests demonstrate that CaAlg-SDS microsphere can balance the interphase property regulation(wettability alteration and IFT reduction)and rheology properties,enabling simultaneous profile control and oil *** introduction of SDS will have a negative impact on rheological properties,which is not favored for *** results show that the involvement of 4-m M SDS will provide the best behavior,with an EOR rate of 34.38%.This cost-effective and environmentally-friendly bio-microspherebased microfluidic displacement technology is expected to achieve“green”oil recovery in future oilfield exploitation.

关键词： Calcium alginate microspheres Wettability Interfacial tension Rheology Viscoelasticity Enhanced oil recovery(EOR)

Eosinophilic solid and cystic renal cell carcinoma with aggressive behavior:Two case reports

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World Journal of Clinical Cases 2024年第22期12卷 5124-5130页

作者： hui-hui Cao Hong Li Xiao-Hong Guo Zhi-Xing Cao bo-hui Zhang Department of Pathology Zhuhai People's Hospital(Zhuhai Clinical Medical College of Jinan University)Zhuhai 519000Guangdong ProvinceChina

BACKGROUND Eosinophilic solid and cystic(ESC)renal cell carcinoma(RCC),a unique and emerging subtype of RCC,has an indolent nature;in some rare instances,it may exhibit metastatic *** cases are inadequate to precisely predict the clinical outcome of ESC RCC and determine treatment *** SUMMARY Herein,we report two patients with ESC *** 1 was a young woman with classical pathological *** 2 was a 52-year-old man with multifocal metastases,involving the pulmonary hilar and mediastinal lymph nodes,liver,brain,mesosternum,vertebra,rib,femur,and symphysis *** of ESC RCC,along with its characteristic architecture and immunophenotype,would contribute to making a definitive diagnosis,even on core biopsy *** The discovery of ESC RCC molecular signatures may provide new therapeutic strategies in the future.

关键词： Eosinophilic solid and cystic renal cell carcinoma Solid and cystic growth pattern CK20 TSC1 mutations TSC2 mutations Case report

政府数据开放能提升民营企业绩效吗——基于多时点双重差分法的验证

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吉林大学社会科学学报 2024年第4期64卷 189-203,239,240页

作者：程波辉罗培锴对外经济贸易大学政府管理学院北京100029

在中国经济转型与创新发展的时代背景下,政府数据开放能否赋能民营企业绩效提升,从而促进民营经济高质量发展有待深入探究。文章基于2009—2021年民营上市公司面板数据,利用地级市政府开通政府数据平台这一准自然实验,检验政府数据开放... 详细信息

在中国经济转型与创新发展的时代背景下,政府数据开放能否赋能民营企业绩效提升,从而促进民营经济高质量发展有待深入探究。文章基于2009—2021年民营上市公司面板数据,利用地级市政府开通政府数据平台这一准自然实验,检验政府数据开放对民营企业绩效提升的促进作用。研究结果表明:政府数据开放能够显著提升民营企业绩效;机制分析结果显示,该作用通过优化区域营商环境、提升企业经营能力的机制实现;拓展分析结果显示,民营企业绩效会随着政府数据开放水平及其细分维度下的制度保障水平、数据质量水平、成果转化水平的提升而提升,对民营企业绩效提升的促进作用在竞争型行业企业与大规模企业中更加明显。基于此,要坚持有序推进政府数据开放工作,利用数据资源变革政府结构与监管模式,引导企业将数据要素融入生产体系当中,并给予管制型行业与中小规模民营企业资源倾斜,着力解决民营经济发展不均衡不充分的问题,从政策供给端支持民营企业发展,为实现民营经济高质量发展提供有力支撑。

关键词：政府数据开放民营企业绩效准自然实验数据要素

金刚石绳锯无损切割在混凝土支撑拆除中的应用

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建筑技术开发 2024年第2期51卷 91-93页

作者：惠波陕西建工第六建设集团有限公司陕西咸阳712000

通过分析上海某建设项目在地基施工中遇到的技术难题,在混凝土支撑拆除过程中研究并应用了金刚石绳锯无损切割混凝土支撑施工工艺,并对施工过程当中的划分原则、废水处理、外运途径、成品保护等问题提出了解决方案,形成了完善的金刚石... 详细信息

通过分析上海某建设项目在地基施工中遇到的技术难题,在混凝土支撑拆除过程中研究并应用了金刚石绳锯无损切割混凝土支撑施工工艺,并对施工过程当中的划分原则、废水处理、外运途径、成品保护等问题提出了解决方案,形成了完善的金刚石绳锯切割深基坑混凝土内支撑施工工艺。

关键词：金刚石绳锯无损切割混凝土支撑拆除

技术标准与制造业资源配置优化——来自中国工业企业的微观证据

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经济学家 2024年第4期 108-117页

作者：孙慧波姜余轲李鹏青岛大学质量与标准化学院中国社会科学院工业经济研究所

提升资源配置效率是贯彻新发展理念、发展新质生产力的重要途径。文章基于深入的理论分析,以中国工业企业为研究样本,实证检验了技术标准对制造业资源配置的影响效果及作用机制。研究表明,技术标准有助于缓解资本和劳动要素扭曲,改善资... 详细信息

提升资源配置效率是贯彻新发展理念、发展新质生产力的重要途径。文章基于深入的理论分析,以中国工业企业为研究样本,实证检验了技术标准对制造业资源配置的影响效果及作用机制。研究表明,技术标准有助于缓解资本和劳动要素扭曲,改善资源错配,提升制造业资源配置效率,且出口强度会正向强化技术标准的资源配置效应;技术标准的资源配置效应在地区层面和行业层面存在明显的异质性,其中东部地区的资源配置效应高于中西部地区,高技术制造业的资源配置效应优于一般制造业;进一步机制研究表明,在企业层面的倒逼效应,以及在行业层面的资源再配置效应和企业退出效应,是技术标准优化资源配置效率的重要渠道。

关键词：技术标准资源配置优化倒逼效应资源再配置效应企业退出效应

资本市场开放进程中沪深港通交易对AH股价共跳的影响——基于权重股作用机制的考察

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现代财经（天津财经大学学报） 2024年第4期44卷 74-89页

作者：温博慧徐佳翔邢雨聪天津财经大学金融学院天津300222

频繁的股价跳跃是考虑尾部风险时需要前置关注的问题,也是资本市场开放进程中监管部门需要重视的内容。本文考察了沪深港通交易对AH股价共跳的影响效果以及背后的作用渠道。同时,对比分析权重股与非权重股共跳差异,探究资本市场开放进... 详细信息

频繁的股价跳跃是考虑尾部风险时需要前置关注的问题,也是资本市场开放进程中监管部门需要重视的内容。本文考察了沪深港通交易对AH股价共跳的影响效果以及背后的作用渠道。同时,对比分析权重股与非权重股共跳差异,探究资本市场开放进程中权重股作用的转变。研究表明:沪深港通交易对AH股价共跳具有正向加剧作用,且加剧作用主要通过降低股票流动性实现,同时AH股价共跳并非是市场效率提升的体现。在全样本区间内,沪深港通主要对非权重股共跳产生加剧作用,但对权重股共跳起到抑制作用,权重股总体上表现出稳定市场的作用。然而,当遇到资金流动规模增大,人民币汇率下行以及投资者情绪低迷时,权重股反而共跳加剧,形成对市场暴涨暴跌的推波助澜。因此,需要重视资本市场开放进程中存在的跳跃风险,为实现资本市场高水平对外开放提供保障。

关键词：资本市场开放沪深港通共跳 AH股权重股