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沉积过程中有机碳及Globigerinoides ruber氧、碳同位素变化特征——以南海南部为例

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沉积学报 2017年第4期35卷 730-739页

作者：李文宝王汝建万随内蒙古农业大学水资源保护与利用自治区重点实验室呼和浩特010018 同济大学海洋地质国家重点实验室上海200092

由水体到沉积物,不同沉积阶段的沉积过程也有所不同。通过对比南海南部(SCS-S)水体沉降颗粒物、海底表层沉积物和岩芯柱状沉积物(上部3 m)中Globigerinoides ruber氧、碳同位素(δ^(18)O、δ^(13)C)值和有机碳(TOC)含量及堆积速率的变化... 详细信息

由水体到沉积物,不同沉积阶段的沉积过程也有所不同。通过对比南海南部(SCS-S)水体沉降颗粒物、海底表层沉积物和岩芯柱状沉积物(上部3 m)中Globigerinoides ruber氧、碳同位素(δ^(18)O、δ^(13)C)值和有机碳(TOC)含量及堆积速率的变化,系统分析了TOC、δ^(18)O、δ^(13)C等环境演变指标参数在沉积过程中的变化特征。结果显示:1)整个沉积过程中,TOC及同位素等环境演变指标参数的变化情况并不一致。不过,由下层水体沉降到海底表层的过程中,TOC及堆积速率(分别由4.20%、0.38 g/(cm^2·ka)下降到1.^(18)2%、0.039 g/(cm^2·ka)、δ^(18)O、δ^(13)C值(分别偏重0.196‰、0.855‰)均出现了明显变化。而一旦形成表层沉积物并被埋藏覆盖形成海底沉积物层(以岩芯柱状沉积物代表)以后,在不考虑冰期—间冰期气候旋回的影响下,除TOC外,δ^(18)O、δ^(13)C值等则基本保持不变;2)不同沉积阶段,TOC含量变化与δ^(18)O、δ^(13)C值的相关性分析表明,岩芯柱状沉积物中TOC含量变化与δ^(18)O、δ^(13)C变化之间的相关性最为明显,特别是TOC含量与δ^(18)O变化间呈显著正相关(r=0.74),即由下层水体到表层沉积物这一沉降过程中,TOC含量与堆积速率的突变及其对应的底层水中溶解氧(O_2)、二氧化碳(CO_2)含量变化可能是诱导δ^(18)O、δ^(13)C大幅偏重的主要因素。因此,利用TOC等指标参数进行古环境变化分析时有必要考虑不同沉积过程的影响。

关键词： Globigerinoides rubber 同位素有机碳(TOC) 沉积过程南海南部

Theoretical Design of Defects as a Driving Force for Ion Transport in li_(3)OBr Solid Electrolyte

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Energy & Environmental Materials 2024年第3期7卷 143-153页

作者： Xingyun Luo Yanlu li Xian Zhao State Key Lab of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China Center for Optics Research and Engineering Shandong UniversityQingdao 266237China

Due to ever-increasing concerns about safety issues in using li ionic batteries,solid electrolytes have extensively *** li-rich antiperovskite li_(3)OBr has been considered as a promising solid electrolyte candidate,but it still suffers challenges to achieve a high ionic conductivity owing to the high intrinsic symmetry of the crystal ***,we presented a design strategy that introduces various point defects and grain boundaries to break the high lattice symmetry of li_(3)OBr crystal,and their effect and microscopic mechanism of promoting the migration of li-ion were explored *** has been found that li_(i)are the dominant defects responsible for the fast li-ion diffusion in bulk li_(3)OBr and its surface,but they are easily trapped by the grain boundaries,leading to the annihilating of the Frenkel defect pair V'_(li)+li_(i),and thus limits the V'_(li)diffusion at the grain *** V_(Br)defect near the grain boundaries can effectively drive V'_(li)across the grain boundary,thereby converting the carrier of li^(+)migration from li,in the bulk and surface to V'_(li)at the grain boundary,and thus improving the ionic conductivity in the whole li_(3)OBr *** work provides a comprehensive insight into the li^(+)transport and conduction mechanism in the li_(3)OBr *** opens a new way of improving the conductivity for all-solid-state li electrolyte material through the defect design.

关键词： defects density functional theory ionic migration solid electrolyte

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变电站电气设备安装技术与质量控制

现代工业经济和信息化 2022年第7期12卷 294-295页

作者：李文宝中国三峡新能源(集团)股份有限公司左云光伏发电有限公司山西大同037100

为了有效解决变电站电气设备在运行工作过程中存在的各种问题,需要对变电站电气设备安装工作加以充分重视。因此,针对电力站电气设备安装技术要点进行分析和研究,并且提出电气设备安装施工质量控制策略,有效保证变电站电气设备安装工作... 详细信息

为了有效解决变电站电气设备在运行工作过程中存在的各种问题,需要对变电站电气设备安装工作加以充分重视。因此,针对电力站电气设备安装技术要点进行分析和研究,并且提出电气设备安装施工质量控制策略,有效保证变电站电气设备安装工作质量和效果,保证变电站各项工作的稳定进行,提高人们的用电质量,为后续类似工作开展提供有效参考和借鉴。

关键词：变电站电气设备安装质量

车站级杂费核收系统数据安全与共享的设计与实现

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铁路计算机应用 2014年第4期23卷 46-48页

作者：李文宝中国铁路总公司信息技术中心北京100844

本文介绍了车站级杂费核收系统在车站级数据安全与数据共享方面的设计与实现。综合考虑了单机模式、网络模式下的实现,在软件层面对统计数据的安全进行了有效控制,同时实现了对不同车站、应用系统数据共享的订制,既保障了安全又做到了... 详细信息

本文介绍了车站级杂费核收系统在车站级数据安全与数据共享方面的设计与实现。综合考虑了单机模式、网络模式下的实现,在软件层面对统计数据的安全进行了有效控制,同时实现了对不同车站、应用系统数据共享的订制,既保障了安全又做到了共享。

关键词：杂费核收系统数据安全数据共享

Highly polar CoP/Co_(2)P heterojunction composite as efficient cathode electrocatalyst for li-air battery

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Chinese Chemical Letters 2024年第9期35卷 486-490页

作者： Miaomiao li Mengwei Yuan Xingzi Zheng Kunyu Han Genban Sun Fujun li Huifeng li Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Center for Advanced Materials Research Beijing Normal UniversityZhuhai 519087China

In order to advance the commercialization of rechargeable li-air batteries,it is of importance to explore cathode catalyst with efficient catalytic *** metal oxides have poor electrical conductivity,while cobalt phosphide has excellent electrical conductivity and large specific surface ***,its application in organic li-air batteries has been much less studied,and the electrocatalytic activity desires to be further ***,CoP/Co_(2)P heterojunction composite with higher polarity was *** discharge product of high-polarity CoP/Co_(2)P had a new porous box-like morphology,which was easy to be decomposed and exposed more active *** highly polar CoP/Co_(2)P heterostructure composite had homogeneous pores,the synergistic effect existed between CoP and Co_(2)P,and the discharge product was porous box mixed with li_(2)O_(2)and liOH,which made CoP/Co_(2)P achieve high specific capacity of14632 m Ah/g and cycle stably 161 times when used as air electrode cathode *** work furnished a thought for the construction of cathode catalysts with efficient catalytic activity for li-air batteries.

关键词： li-air battery Cathode catalyst CoP/Co_(2)P Heterojunction structure High polarity

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小学语文作业评价探析

科教文汇 2012年第29期 98-99页

作者：李文宝甘肃省张家川县平安乡水泉小学甘肃天水741500

本文通过对小学语文作业评价的意义以及现状进行了分析,认为优化小学语文作业设计、加强小学语文作业指导、优化小学语文作业评价,是提升小学语文作业有效性的重要途径。

关键词：小学语文作业评价

Synergy effect of regulated li-plating and functional solid electrolyte interphase on graphite anodes

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Nano Research 2024年第9期17卷 8077-8085页

作者： Panpan Wang Baojia Xia Jianling li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 201800China

The growth of li dendrites poses potential safety hazard to lithium-ion batteries(liBs),and eliminating li dendrites thoroughly stills face tough difficulties ***,regulating li-plating is a critical optimization-direction to address the ***,a“graphite-li hybrid”anode with high reversibility is realized under the constant-capacity lithiation(CCL).Within CCL,the uniform distribution of li-plating on the graphite surface is successfully *** evolution in different states of solid electrolyte interphase(SEI)is investigated in detail to study the interaction between the potentials and impedance during the process of liintercalation and *** the potential below 0 V and the state of charge(SOC)of 110%relative to the theoretical capacity,the F-rich SEI with high stability is constructed to hinder the emergency of li dendrites and maintain the intact structure of graphite anode under long *** cell presents more than 100%Coulombic efficiency(CE)with the 900 cycles,demonstrating the reversible li-plating and the utilization of *** the CCL half-cell provides a good cycling performance and specific capacity of 900 cycles at 0.5 C,it is attributed to the synergy effect of stable inorganic-rich SEI and regulated active li-plating.

关键词： "graphite-li hybrid"anode li-plating reversibility solid electrolyte interphase(SEI)

Robust chemo-mechanical stability of additives-free SiO2anode realized by honeycomb nanolattice for high performance li-ion batteries

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Chinese Chemical Letters 2024年第10期35卷 468-472页

作者： Xinpin Pan Yongjian Cui Zhe Wang Bowen li Hailong Wang Jian Hao Feng li Jing li Advanced Energy Storage Materials Lab School of Materials and New Energy Ningxia University School of Chemistry and Chemical Engineering Ningxia University

Silicon-based anodes including Si, Si Oxand SiO2could deliver ultra-large capacities, but degrade fast owing to huge volume change and low conductivity. Generally, large amounts of elastic binder and conductive additives were composited with nanosized silicon-based materials to yield reasonable cycling stability, which nevertheless not only decrease specific capacity but also induce inhomogeneous lithiation/delithiation as well as uneven stress variations. Artificial nanolattice has exhibited superior mechanical properties which could be ideal structure for silicon-based anodes, but yet faces challenges in integration of chemical reactivity, conductivity and mechanical stability. Herein, we fabricate artificial SiO2honeycomb nanolattice consisting of numerous nanoscale SiO2cells interconnected by through-holes,and conformal coating of highly graphitic carbon on the nanolattice is achieved through in situ catalytic graphitization. Moreover, the nanolattice is firmly bonded on Cu substrate through atomic interdiffusion irrespective of surface roughness. This unique structure allows fast charge transportation and homogeneous lithiation/delithiation throughout the micron-meter nanolattice, which results in excellent stability and large reversible capacity over 500 cycles at 1 A/g. The results highlight design and constructing artificial nanolattice can be an effective way to prevent chemo-mechanical degradation of silicon-based anode materials.

关键词： Conductivity li-ion batteries Nanolattice SiO2 anode Stability

南塔斯曼海微玻陨石颗粒:深海记录中撞击事件的环境效应

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第四纪研究 2011年第5期31卷 849-855页

作者：李文宝王汝建丁晓辉内蒙古农业大学水利与土木建筑工程学院呼和浩特010018 同济大学海洋地质国家重点实验室上海200092

基于常规环境演变指标的研究结果显示,大规模陨击事件的确可以造成地球环境的突变,但是对陨击事件期间水生或陆地植被类型变化的研究却并不多见。因此,通过统计南塔斯曼海大洋钻探计划(ODP)1170站位(47°9.0344′S,146°2.9846′W;水深2... 详细信息

基于常规环境演变指标的研究结果显示,大规模陨击事件的确可以造成地球环境的突变,但是对陨击事件期间水生或陆地植被类型变化的研究却并不多见。因此,通过统计南塔斯曼海大洋钻探计划(ODP)1170站位(47°9.0344′S,146°2.9846′W;水深2705m)B孔16～15m(mbsf)沉积物中微玻陨石颗粒丰度,结合有孔虫壳体氧、碳同位素(δ^(18)O和δ^(3)C)、表层海水温度(Sea Surface Ternperture,简称SST)等常规参数指标,分析了不同生物标志物含量变化,重建了陨击事件过程中海洋与陆地植被结构的演变历史。结果发现:1)南塔斯曼海ODP 1170站位沉积物中微玻陨石颗粒丰度峰值出现在15.55～15.45m,且.根据生物地层确定来源于0.8Ma前后的澳大利亚陨击事件(Australian Meteorite lnpact Event,简称AMIE),其中微玻陨石颗粒最多出现在15.50m,颗粒丰度达9.4枚/g;2)AMIE导致SST下降约1.7℃,颗石藻与硅藻的含量比值由15.58m的约6突然下降到15.50m的约2.6,显示表层海水环境向有利于硅藻等生存的方向发展,同时烷烃C_(15～19)与C_(21～25)的含量突然下降约50%,显示表层海水环境向不利于菌(藻)类或其他浮游植物等生存的方向演化;3)AMIE对陆地植被种类的演化及陆源有机质输入的影响有限,并且.在微玻陨石丰度下降的15.45～15.30m深度;ACL,C_(31)/C_(29)和∑Odd(C_(25～33))却突然增加,显示陆源植被种类变化对AMIE的响应可能存在一定程度的滞后。

关键词：微玻陨石澳大利亚陨击事件生物标志物环境效应南塔斯曼海