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Origin and tectonic setting of low-Si alkaline magma

Science China Earth Sciences 2024年第5期67卷 1417-1435页

作者： qiushi zhou Rui WANG State Key Laboratory of Geological Processes and Mineral Resources and Institute of Earth SciencesChina University of GeosciencesBeijing 100083China Frontiers Science Center for Deep-time Digital Earth China University of Geosciences(Beijing)Beijing 100083China

Despite of the relatively rare occurrence of alkaline igneous rocks on Earth, they are the most diverse group of igneous rocks due to variations in their mineral assemblages and geochemical compositions. Alkaline igneous rocks are generally characterized by Si undersaturation, and K-Na(and in some cases C) enrichment. Although there is no unified alkaline igneous rock classification scheme, diagrams such as total alkalis-SiO_(2) or K_(2)O-SiO_(2) can be used to classify alkaline igneous rocks. The origins of silica-saturated alkaline rocks(SiO_(2)>52 wt.%) are relatively complex because multiple episodes of magmatism are often involved, therefore most studies have focused on the origins of silica-undersaturated alkaline *** experimental petrological studies have been conducted in the past few decades. Initially, it was considered that enrichment of trace elements was only achieved by low-degree partial melting of mantle peridotite, but the experimental melts could not reproduce the geochemical composition of natural alkaline igneous rocks. Subsequent studies have focused on carbonate-bearing eclogites that represent the average component of subducted oceanic crust. Although experimental studies indicate that silica-undersaturated and alkali-oversaturated melts can be generated from eclogites, some studies have considered that natural silica-undersaturated alkaline igneous rocks are the result of multi-stage source enrichment by incompatible elements. Low-degree partial melts of the mantle can be emplaced in the lithospheric mantle, forming veins consisting of phlogopite, amphibole, and pyroxene. Melting experiments including these components show that the produced melts better reproduce the naturally occurring silica-undersaturated alkaline magmas. Silica-deficient alkaline igneous rocks occur in various tectonic settings. Those in intraplate and divergent settings(i.e., mainly continental rifts) normally involve contributions from recycled components su

关键词： Alkaline igneous rock Tectonic setting Petrogenesis Big data

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统筹开发与保护的市级国土空间规划分区研究

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规划师 2024年第7期40卷 90-96页

作者：曾源源岳文泽苏亮周秋实浙江大学公共管理学院嘉兴市国土空间规划研究有限公司

首先,采用演绎归纳法系统梳理市级国土空间规划分区的定位,明确规划分区是国土空间用途管制制度和主体功能区战略实施的重要支撑,也是其他专项规划分区实施的基本依据;其次,提出以自然资源禀赋、资源开发潜在价值的比较优势和区域发展... 详细信息

首先,采用演绎归纳法系统梳理市级国土空间规划分区的定位,明确规划分区是国土空间用途管制制度和主体功能区战略实施的重要支撑,也是其他专项规划分区实施的基本依据;其次,提出以自然资源禀赋、资源开发潜在价值的比较优势和区域发展需求为核心识别国土空间主导功能,开展以主导功能为依据的空间分区;最后,以山西省朔州市为案例,以国土空间利用现状、“双评价”和省级主体功能区规划为支撑,结合地方自然资源禀赋特点,统筹开发与保护需求,提出了生态保护区、生态控制区、农田保护区、乡村发展区、城镇发展区和矿产能源发展区的规划分区方案,并提出针对性、差异化的管控建议,以期为地方实现高水平保护、高效率开发与高效能治理提供参考。

关键词：规划分区开发与保护用途管制朔州市

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Estimation on structural responses using multi scale measurements

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Science China(Technological Sciences) 2014年第9期57卷 1707-1713页

作者： LU Wei WU FengQi TENG Jun zhou qiushi Department of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Graduate School Shenzhen Capol International & Associates Group

Different measurands from the different types of sensors can obtain different information regarding the structural behavior in a real structural health monitoring *** enrich information and estimate the structural responses based on much more known information,the estimation on structural responses using multi scale measurements from multi-type sensors is proposed in this *** identification is constructed with the pattern library given by strain measurements and deformation *** the uncertainty of the measurements as well as to enhance the robustness of the proposed algorithm,more than one best pattern is selected to synthesize the finally estimated stress *** validate the capacity of the proposed acquisition method using multi scale measurements,finite element model analysis is conducted to estimate the structural stress response in Shenzhen Bay Stadium as an *** performance of the pattern identifications,constructed by two kinds of pattern libraries captured by sole strain measurement,and multi scale measurements which are constructed by both kinds of strain measurements and deformation measurements,respectively,are compared in this paper to observe measurements constructed from strain measurements and deformation measurements outperformed *** analysis for a series of parametric studies in which noise at different levels has also included in the measurements are further carried out,and robustness of the proposed information acquisition scheme under noisy measurement is demonstrated.

关键词： structural health monitoring multi scale sensor measurements pattern identification information fusion

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Vision implants:An electrical device will bring light to the blind

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Science in China(Series F) 2008年第1期51卷 101-110页

作者： NIU JinHai LIU YiFei REN qiushi zhou Yang zhou Ye NIU Shuai Department of Biomedical Engineering Institute for Laser Medicine and Bio-Photonics Shanghai Jiao Tong University Shanghai 200240 China

Cochlear implant has been successfully applied in clinic. Recent research indicates vision implants may be the potential way to restore sight for the blind. Here, principle and common structure of vision implants are introduced. Main vision approaches of retinal, optic nerve, and cortical prosthesis are reviewed. In our progress, electrical response at visual cortex is recorded, when penetrating electrodes stimulate rabbit optic nerve, vision implants based on optic nerve stimulator chip （ONSC） and Chipcon radio frequency （RF） chip are under developing. Despite several obstacles to overcome, promising results in animal and human experiments give scientists confidence that artificial vision implants will bring light to the blind in the near future.

关键词： vision implants electrical devices retinal optic nerve cortical prosthesis

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深部过程和物质架构对大陆碰撞带Cu-REE成矿系统的控制:以冈底斯和三江碰撞带为例

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地学前缘 2024年第1期31卷 211-225页

作者：王瑞张京渤罗晨皓周秋石夏文杰赵云中国地质大学(北京)科学研究院地质过程与矿产资源国家重点实验室北京100083 中国地质大学(北京)地球科学与资源学院北京100083

青藏高原是全球最典型的大陆碰撞带,发育世界级规模的斑岩Cu成矿带和REE成矿带,但目前尚不清楚大陆碰撞如何控制它们的形成。基本问题是:触发碰撞增厚的岩石圈熔融的机制,岩石圈架构与Cu-REE成矿的关系以及Cu-REE和挥发分的来源及成矿... 详细信息

青藏高原是全球最典型的大陆碰撞带,发育世界级规模的斑岩Cu成矿带和REE成矿带,但目前尚不清楚大陆碰撞如何控制它们的形成。基本问题是:触发碰撞增厚的岩石圈熔融的机制,岩石圈架构与Cu-REE成矿的关系以及Cu-REE和挥发分的来源及成矿机制。利用深反射地震和卫星重力数据的联合反演,结合大地电磁(MT)阵列和地球化学数据,对冈底斯正向碰撞带和三江侧向碰撞带的岩石圈结构进行了成像分析,探讨深部过程和物质架构对于Cu-REE成矿的控制。新生代印度大陆-亚洲大陆碰撞过程中,俯冲的印度大陆岩石圈发生了显著的撕裂,从而为软流圈上升流提供了通道,改造了上覆的岩石圈并引发融熔。这一过程产生超钾质熔体,这些熔体上升并在地壳底部积聚,其高的热流值和挥发分释放诱发了上覆新生下地壳的熔融形成富水岩浆,角闪石分离结晶造成岩浆氧化,这种富水高氧逸度的岩浆有利于Cu的迁移和富集。研究表明,三个关键因素形成了与碰撞相关的斑岩矿床:中等角度板片俯冲,板片撕裂和富硫化物新生下地壳的熔融。在三江侧向碰撞带的扬子克拉通边缘,由印度大陆俯冲或地幔对流驱动的热软流圈的垂直上升流和横向流动导致克拉通大陆岩石圈发生热侵蚀和部分熔融。克拉通边缘的大陆岩石圈先前经历了来自再循环海洋沉积物的富含REE和CO_(2)的流体的交代作用,从而富集了REE,后来又被沿着岩石圈不连续面(例如走滑断层、裂谷)上升的碳酸岩熔体携带,形成大型的碳酸岩型稀土矿床。而缺乏源区交代作用的克拉通大陆岩石圈的熔融可能会产生碳酸岩、超钾质岩和镁铁质岩熔体,但它们形成碳酸岩型稀土矿床的潜力有限。

关键词：大陆俯冲大陆碰撞板片撕裂 Hf填图新生地壳

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Application of Tandem Cascade to Design of Fan Stator with Supersonic Inflow

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Chinese Journal of Aeronautics 2010年第1期23卷 9-14页

作者： Li qiushi,Wu Hong,zhou Sheng School of Jet Propulsion,Beijing University of Aeronautics and Astronautics,Beijing 100191,China School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100191 China

This article proposes a tandem cascade constructed to tackle the thorny problem of designing the high-loaded stator with a supersonic inflow and a large turning angle. The front cascade adopts a supersonic profile to reduce the shock wave intensity turning the flow into subsonic,while the rear cascade adopts a subsonic profile with a large camber offering the flow a large turning angle. It is disclosed that the losses would be minimized if the leading edge of the rear cas- cade lies close to the pressure side of the front cascade at a distance of 20% pitch in pitch-wise direction without either axial spacing or overlapping in axial direction. The 2D numerical test results show that,with the inflow Mach number of 1.25 and the turning angle of 52° ,the total pressure loss coefficient of the tandem cascade reaches 0. 106 ,and the diffusion factor 0. 745. Finally,this article has designed and simulated a high-loaded fan stage with the proposed tandem stator,which has the pressure ratio of 3.15 and the efficiency of 86.32% at the rotor tip speed of 495.32 m/s.

关键词： fan/compressor tandem cascade stator supersonic inflow

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三里坪双曲拱坝接触、接缝灌浆施工工艺

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人民长江 2012年第6期43卷 69-72页

作者：周秋实中国水电建设集团十五工程局有限公司陕西西安712000

为了加强三里坪大坝混凝土与坝肩的结合力,增强接触面的密实性并防止漏水,对大坝混凝土与坝拱肩岩石之间缝隙进行接触灌浆。同时,为了保证坝体在蓄水运行后的整体性和有效传递应力,在蓄水前用水泥浆对大坝诱导缝进行接缝灌浆。介绍了大... 详细信息

为了加强三里坪大坝混凝土与坝肩的结合力,增强接触面的密实性并防止漏水,对大坝混凝土与坝拱肩岩石之间缝隙进行接触灌浆。同时,为了保证坝体在蓄水运行后的整体性和有效传递应力,在蓄水前用水泥浆对大坝诱导缝进行接缝灌浆。介绍了大坝岸坡接触灌浆与坝体接缝灌浆的具体施工工艺,提出了有针对性的质量控制策略,包括管路埋设、灌浆材料、灌浆压力和灌浆结束标准等控制措施。

关键词：碾压混凝土接缝灌浆接触灌浆中热硅酸盐水泥超细水泥三里坪水电站

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Converting intercalation-type cathode in spent lithium-ion batteries into conversion-type cathode

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Nano Research 2024年第5期17卷 4602-4609页

作者： Dingding Zhu Yong Su Jingzhao Chen Xiangze Ou Xuedong Zhang Wen Xie Yuyan zhou Yunna Guo qiushi Dai Peng Jia Jitong Yan Lin Geng Baiyu Guo Liqiang Zhang Yongfu Tang Qiao Huang Jianyu Huang School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066000China

The widespread applications of lithium-ion batteries(LIBs)generate tons of spent ***,recycling LIBs is of paramount importance in protecting the environment and saving the *** commercialized LIBs mostly adopt layered oxides such as LiCoO_(2)(LCO)or LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)(NMC)as the cathode *** the intercalation-type spent oxides into conversion-type cathodes(such as metal fluorides(MFs))offers a valid recycling strategy and provides substantially improved energy densities for ***,two typical Co-based cathodes,LCO and LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NMC622),in spent LIBs were successfully converted to CoF_(2) and(Ni_(x)Co_(y)Mn_(z))F_(2) cathodes by a reduction and fluorination *** as converted CoF_(2) and(Ni_(x)Co_(y)Mn_(z))F_(2) delivered cell energy densities of 650 and 700 Wh/kg,*** atomic-level electron microscopy revealed that the used LCO and NMC622 were converted to highly phase pure Co metal and Ni_(0.6)Co_(0.2)Mn_(0.2) alloys in the used graphite-assisted reduction roasting,simultaneously producing the important product of Li_(2)CO_(3) using only environment friendly *** study provided a versatile strategy to convert the intercalation-type Co-based cathode in the spent LIBs into conversion-type MFs cathodes,which offers a new avenue to recycle the spent LIBs and substantially increase the energy densities of next generation LIBs.

关键词： spent lithium-ion batteries recycling energy densities conversion-type cathode

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Westward extension of summer atmospheric circulation over the North Pacific after the 1990s

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Atmospheric and Oceanic Science Letters 2024年第2期17卷 1-6页

作者： Guowa Tang Tingting Han Botao zhou qiushi Zhang School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjingChina Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University for Information Science and TechnologyNanjingChina Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Heilongjiang Sub-Bureau of Northeast Air Traffic Management Bureau HarbinChina

本文研究了20世纪90年代前后夏季北太平洋大气环流(NPcirculation)向西扩展,并探讨了其可能的原因.结果表明,在1961-1983年期间NP中心主要位于东北太平洋,而在1994-2016年期间NP中心发生西移,至北太平洋中部进一步分析指出,90年代以后N... 详细信息

本文研究了20世纪90年代前后夏季北太平洋大气环流(NPcirculation)向西扩展,并探讨了其可能的原因.结果表明,在1961-1983年期间NP中心主要位于东北太平洋,而在1994-2016年期间NP中心发生西移,至北太平洋中部进一步分析指出,90年代以后NP活动中心的西移和春季中纬度北太平洋海温(SST_NP)与NP关系的加强有关.春季SST_NP异常通过引起后期夏季北太平洋中部地表热通量(即感热通量和潜热通量)和垂直运动异常,有利于NP活动中心向西移动,此外,20世纪90年代以后,北太平洋中部海平面气压的年际变率增加,这可能是NP向西扩展的另一原因。

关键词：大气环流北太平洋西移海表面温度年际变率

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移动式云联视频考场监控系统的设计与实现

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工业技术与职业教育 2016年第3期14卷 16-18页

作者：周秋实唐山市职称考试中心河北唐山063000

常规标准化考场监控系统打击了考试舞弊现象的发生,但随着电子技术的不断发展,也存在一定局限性,通过对其进行分析,有的放矢,进行技术改良,结合无线通信技术和云技术设计一套更加灵活、更易管理的移动式云联视频考场监控系统。

关键词：考场巡视视监控系统无线技术

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