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LiFePO_4/C via fluoride doping

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Rare Metals 2012年第6期31卷 573-577页

作者： Gu Yuan zhang xiangjun Lu Shigang Zhao Ting Jiang Danping Yang Rong Wu Aide Gen Res Inst Nonferrous Met R&D Ctr Vehicle Battery & Energy Storage Beijing 100088 Peoples R China

Non-stoichiometric compound fluoride-doped LiFePO4/C cathode materials were synthesized via solid-state reaction using MgF2 and AlF3 as dopant. The fluoride-doped LiFePO4/C samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical testing. The results show that the materials are well crystallized and fluoride doping cannot change the space structure of LiFePO4. Slight amounts of Fe2O3 with no fluoride impurity were detected. Charge-discharge curves show that fluoride-doped samples have higher capacity at low rates compared with undoped LiFePO4/C. AlF3-doped samples have highest capacity at high discharge current. Both doped samples have larger polarization voltage than undoped samples. All samples exhibit good cycle stability.

关键词： lithium-ion batteries cathode materials LiFePO4 fluoride doping

淬火方式对7050铝合金挤压棒材组织和性能的影响研究

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铝加工 2024年第5期 18-23页

作者：曹善鹏王玉玲马军星盛彦张向军山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心山东龙口265700 烟台南山学院山东龙口265700 凌源市职业教育中心辽宁凌源122500

以ϕ75 mm7050铝合金棒材为研究对象,分别采用离线和在线方式对试样进行淬火处理,然后进行时效处理。采用OM、SEM、EDS、TEM和电子拉伸试验机分析测试了在线及离线淬火试样的组织和拉伸性能,并对结果进行了比较;对离线及在线淬火试样进... 详细信息

以ϕ75 mm7050铝合金棒材为研究对象,分别采用离线和在线方式对试样进行淬火处理,然后进行时效处理。采用OM、SEM、EDS、TEM和电子拉伸试验机分析测试了在线及离线淬火试样的组织和拉伸性能,并对结果进行了比较;对离线及在线淬火试样进行应力腐蚀试验及剥落腐蚀试验,比较了两种淬火方式下试样的耐腐蚀性能。结果表明:在线淬火试样基体中的第二相数量远多于离线淬火试样。离线淬火试样晶内析出相以杆状η′相为主,还存在部分η相。在线淬火试样晶内可见大量纠缠聚集的GP区,存在部分η′相和少量η相。在线淬火试样由于固溶温度低、淬火冷速不足,降低了过饱和固溶体的溶质浓度,进而减少了时效沉淀强化相的数量,导致在线淬火试样的强度降低。在线与离线淬火试样的电导率、应力腐蚀性能和剥落腐蚀性能均符合相关标准要求。双级时效能有效改善铝合金抗应力腐蚀性能及耐剥落腐蚀性能,抗腐蚀性能较峰值时效也具有一定优势。

关键词： 7050铝合金挤压棒材在线淬火离线淬火双级时效

Biomarkers for neuromyelitis optica:a visual analysis of emerging research trends

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Neural Regeneration Research 2024年第12期19卷 2735-2749页

作者： xiangjun Li Jiandong zhang Siqi zhang Shengling Shi Yi’an Lu Ying Leng Chunyan Li Department of Ophthalmology Affiliated Hospital of Beihua UniversityJilinJilin ProvinceChina Department of Ophthalmology Changchun Bright Eye HospitalChangchunJilin ProvinceChina Departemt of Endocrinology Affiliated Hospital of Beihua UniversityJilinJilin ProvinceChina

Neuromyelitis optica is an inflammatory demyelinating disease of the central nervous system that differs from multiple *** the past 20 years,the search for biomarke rs for neuromyelitis optica has been ***,we used a bibliometric approach to analyze the main research focus in the field of biomarkers for neuromyelitis *** in this area is consistently increasing,with China and the United States leading the way on the number of studies *** Mayo Clinic is a highly reputable institution in the United States,and was identified as the most authoritative institution in this ***,Professor Wingerchuk from the Mayo Clinic was the most authoritative expe rt in this *** analysis revealed that the terms "neuro myelitis optica"(261 times), "multiple sclerosis"(220 times), "neuromyelitis optica spectrum disorder"(132 times), "aquaporin4"(99 times),and "optical neuritis"(87 times) were the most frequently used keywords in literature related to this *** analysis of the classical literature showed that the majority of publications provide conclusive research evidence supporting the use of aquaporin-4-IgG and neuromyelitis optica-IgG to effectively diagnose and differentiate neuromyelitis optica from multiple ***,aquaporin-4-IgG has emerged as a highly specific diagnostic biomarker for neuromyelitis optica spectrum *** oligodendrocyte glycoprotein-IgG is a diagnostic biomarke r for myelin oligodendrocyte glycoprotein antibody-associated *** biomarkers for neuromyelitis optica in clude cerebrospinal fluid immunological biomarkers such as glial fibrillary acidic protein,serum astrocyte damage biomarkers like FAM19A5,serum albumin,and gammaaminobutyric *** latest prospective clinical trials are exploring the potential of these *** results indicate that glial fibrillary acidic protein is emerging as a promising candidate biomarker for neuromyelit

关键词： aquaporin-4 autoantibody multiple sclerosis myelin oligodendrocyte glycoprotein antibody-associated disease neuromyelitis optica neuromyelitis optica spectrum disorder optical coherence tomography

基于MASTA的大速比减速器齿轮综合修形优化设计

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新技术新工艺 2024年第5期437卷 44-50页

作者：邹俊张向军覃江南李秋明曹发付学中方盛车桥(柳州)有限公司技术中心广西柳州545036 广西科技大学机械与汽车工程学院广西柳州545616

为了优化某大速比减速器斜齿圆柱齿轮传动系统的振动噪声水平,通过MASTA对其一、二级齿轮传动进行啮合及振动噪声仿真分析,发现存在偏载、应力集中、振动噪声较大等问题,存在较大的传递误差。以减小传递误差与齿面接触应力为目标,进行... 详细信息

为了优化某大速比减速器斜齿圆柱齿轮传动系统的振动噪声水平,通过MASTA对其一、二级齿轮传动进行啮合及振动噪声仿真分析,发现存在偏载、应力集中、振动噪声较大等问题,存在较大的传递误差。以减小传递误差与齿面接触应力为目标,进行齿面修形优化设计,建立齿面修形优化模型并求解,采用MASTA对修形后模型进行分析,并对其样机进行噪声试验,验证齿面修形的有效性。结果显示:MASTA分析结果符合理论分析,仿真方法准确,修形后齿轮的接触应力和传递误差均明显减小,接触斑点分布均匀,振动噪声明显降低,且一级齿轮传动比二级齿轮传动效果更明显。可见此优化设计方案对减速器减振降噪具有较好的效果,为此类减速器齿轮设计提供理论参考。

关键词：减速器齿面修形接触应力接触斑点传递误差振动噪声

瓜蒌薤白半夏汤加味治疗不稳定型心绞痛的效果

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中国当代医药 2024年第24期31卷 106-109页

作者：刘成张祥军龙声志刘宇郝家鹏卫蓉贵州省毕节市中医医院肝病科贵州毕节551700 贵州中医药大学第一附属医院门诊部贵州贵阳550001

目的探讨瓜蒌薤白半夏汤加味治疗不稳定型心绞痛(UAP)患者的临床效果。方法选取2022年1月至2023年12月贵州中医药大学第一附属医院收治的100例UAP患者作为研究对象,按照随机数字表法分为试验组(n=50)和对照组(n=50)。对照组采取常规西... 详细信息

目的探讨瓜蒌薤白半夏汤加味治疗不稳定型心绞痛(UAP)患者的临床效果。方法选取2022年1月至2023年12月贵州中医药大学第一附属医院收治的100例UAP患者作为研究对象,按照随机数字表法分为试验组(n=50)和对照组(n=50)。对照组采取常规西药治疗,试验组采取常规西药联合瓜蒌薤白半夏汤加味治疗。比较两组患者的治疗效果、中医证候积分、心功能、心肌损伤标志物水平等。结果试验组治疗总有效率、左室射血分数(LVEF)水平高于对照组,差异有统计学意义(P<0.05);试验组中医证候积分、左室收缩末期内径(LVESD)、左心室舒张末期内径(LVEDD)、心肌肌钙蛋白(cTn)、脑利尿钠肽(BNP)、肌酸激酶同工酶(CK-MB)水平均低于对照组,差异有统计学意义(P<0.05)。结论瓜蒌薤白半夏汤加味治疗UAP具有显著效果,可改善机体心功能与血脂水平,降低中医证候积分,减轻疾病损害程度。

关键词：瓜蒌薤白半夏汤加味不稳定型心绞痛症状改善治疗效果

Tin oxide-graphite composite for lithium storage material in lithium-ion batteries

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Rare Metals 2003年第3期22卷 226-229页

作者： zhang xiangjun, HUANG Songtao, WU Guoliang, LU Shigang, and CAI ZhenpingGeneral Research Institute for Non-ferrous Metals, Beijing 100088, China General Research Institute for Non-ferrous Metals 北京 100088

A SnO-graphite composite material, which can deliver high capacities and good cycling stability compared with unsupported SnO, was described. This material prepared via chemical co-precipitation reaction in the presence of graphite consists of high dispersion of SnO with a size of about several hundred nanometers in the graphite. The phase structure was analyzed by X-ray diffraction (XRD). The morphology and the element distribution were examined by scanning electron microscopy (SEM) equipped with energy spectrum. The results show that the SnO-graphite composites produced by slowly hydrolysis have higher rechargeable capacities than pure graphite and better cycling performance than SnO.

关键词： lithium-ion battery composite co-precipitation tin oxide storage material graphite

The secondary periodic element β-1 and its applications

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Science China Mathematics 2024年

作者： Jianguo Hong xiangjun Wang Yu zhang Science College Shijiazhuang University School of Mathematical Sciences Nankai University Center for Applied Mathematics Tianjin University

Let p≥7 be a *** prove that βp2/p2-1survives to E∞in the Adams-Novikov spectral ***,using the Thom map Φ:ExtBP*BP*,*（BP*,BP*）→ExtA*,*（Z/p,Z/p）,we can see that h0h3also survives to E∞in the classical Adams sp...

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Access to advanced sodium-ion batteries by presodiation:Principles and applications

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Journal of Energy Chemistry 2024年第5期92卷 162-175页

作者： Shihao zhang Ruoyu Cao xiangjun Pu Along Zhao Weihua Chen Chunhua Song Yongjin Fang Yuliang Cao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072HubeiChina College of Chemistry&Green Catalysis Center Zhengzhou UniversityZhengzhou 450001HenanChina Shenzhen Janaenergy techonulogy Co. Ltd.Shenzhen 518000GuangdongChina School of Chemistry and Chemical Engineering Jiangsu University of TechnologyChangzhou 213001JiangsuChina Zonergy Corporation NO.68 Fucang RoadYantan DistrictZigong 643030SichuanChina

Sodium-ion batteries(SIBs)are expected to offer affordability and high energy density for large-scale energy storage ***,the commercial application of SIBs is hurdled by low initial coulombic efficiency(ICE),continuous Na loss during long-term operation,and low sodium-content of cathode *** this scenario,presodiation strategy by introducing an external sodium reservoir has been rationally proposed,which could supplement additional sodium ions into the system and thereby markedly improve both the cycling performance and energy density of *** this review,the significance of presodiation is initially introduced,followed by comprehensive interpretation on technological properties,underlying principles,and associated approaches,as well as our perspectives on present inferiorities and future research ***,this contribution outlines a distinct pathway towards the presodiation methodology,of significance but still in its nascent phase,which may inspire the targeted guidelines to explore new chemistry in this field.

关键词： Presodiation Increased coulombic efficiency High reversible capacity Sodium ion batteries

The source of heavy metals and its indication to the sediment transfer in the Hangzhou Bay

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Acta Oceanologica Sinica 1993年第1期12卷 107-114页

作者： Liao Xiangui, zhang xiangjun Ying Shili, Wei Linying and Zhu Linfan Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China China

-Suspended matters are important carriers of heavy metals in the *** this paper, the field investigation , lab. experiment and 'corresponding analysis' were made to study sources of the heavy metals and the transfer of suspended matters from the Hangzhou *** conclusion shows that the contents of heavy metals in this area are the natural background values ; the distributions of heavy metals are controlled by the plume front.

关键词： The source of heavy metals and its indication to the sediment transfer in the Hangzhou Bay