检索结果-南通市图书馆

Tailoring the secondary phases and mechanical properties of ODS steel by heat treatment

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2019年第6期35卷 1064-1073页

作者： Qian Zhao Zongqing ma Liming Yu Huijun Li chenxi Liu Chong Li Yongchang Liu State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science & EngineeringTianjin University

The oxide dispersion strengthened(ODS) steel with the nominal composition of Fe–14 Cr–2 W–0.3 Ti–0.2 V–0.07 Ta–0.3 Y2O3(wt%) was fabricated by mechanical alloying and hot isostatic pressing(HIP). In order to optimize the relative volume fraction of secondary phases, the as-HIPed ODS steel was annealed at 800°C, 1000°C, 1200°C for 5 h, respectively. The microstructures and different secondary phases of the as-HIPed and annealed ODS samples were identified by scanning electron microscopy(SEM), transmission electron microscopy(TEM), and X-ray diffraction(XRD). The tensile properties of all the ODS steels at room temperature were also investigated. The results indicate that annealing is an effective way to control the microstructure and the integral secondary phases. The annealing process promotes the dissolution of M23C6 particles, thus promoting the precipitation of *** obvious coarsening of Y2Ti2O7 nanoparticles can be observed during annealing. The tensile results indicate that the annealed ODS sample with the optimized secondary phases and high density possesses the best mechanical properties.

关键词： ODS steel Annealing Secondary phase Mechanical property

胶西北大泽山岩体地球化学、锆石U-Pb年代学及Lu-Hf同位素特征

在线全文

学校读者我要写书评

暂无评论

地质科学 2024年第1期59卷 21-37页

作者：李增胜张晨西迟乃杰单伟刘传娥马祥县解玉凤申颖王秀凤山东省地质科学研究院自然资源部金矿成矿过程与资源利用重点实验室山东省金属矿产成矿地质过程与综合利用重点实验室济南250013 山东省地质矿产勘查开发局八〇一水文地质工程地质大队济南250014 潍坊市建筑设计研究院有限责任公司山东潍坊261041

胶东金矿集区是我国最重要的金矿集区,大规模金成矿作用发生于125~110 ma。本文选择了与成矿作用同期的早白垩世晚期大泽山岩体为研究对象,通过详细的岩相学、岩石地球化学、锆石LA-ICP-MS U-Pb年代学研究,识别出中粒二长花岗岩和细粒... 详细信息

胶东金矿集区是我国最重要的金矿集区,大规模金成矿作用发生于125~110 ma。本文选择了与成矿作用同期的早白垩世晚期大泽山岩体为研究对象,通过详细的岩相学、岩石地球化学、锆石LA-ICP-MS U-Pb年代学研究,识别出中粒二长花岗岩和细粒二长花岗岩两种主要的侵入岩类型,它们具有相似的岩相学和岩石地球化学特征,呈现同源岩浆演化特征。定年结果表明,中粒二长花岗岩中锆石U-Pb年龄分别为119.8±0.8 ma和119.3±0.9 ma,细粒二长花岗岩中锆石U-Pb年龄分别为109.2±0.7 ma和109.9±0.7 ma。岩石地球化学研究表明,二长花岗岩具有高的全碱(K_(2)O+Na_(2)O=8.14%~8.72%),高的Al_(2)O_(3)(12.42%~15.32%),属过铝质高钾钙碱性系列,轻稀土(LREE)富集、重稀土(HREE)相对亏损(LREE/HREE=8.46~18.87),具明显的稀土元素分馏((La/Yb)_(N)=8.52~24.08)和较强的Eu负异常(δEu=0.33~0.58)。大泽山岩体锆石ε_(Hf)(t)值为-26.4~-16.2,亏损地幔二阶段模式年龄(T_(DM2))为2812~2173 ma,物源主要是古元古代和新太古代陆壳的部分熔融,有少量幔源物质的加入。大泽山岩体成岩期与胶东金矿的主成矿期一致,暗示岩浆活动与金成矿具有统一的地球动力学背景。

关键词：地球化学锆石U-Pb年龄 Lu-Hf同位素大泽山岩体胶西北

High-performance lithium-ion batteries based on polymer/graphene hybrid cathode material

在线全文

学校读者我要写书评

暂无评论

中国科学:化学英文版 2023年第9期66卷 2683-2689页

作者： Yang Zhao Minghan Ni Nuo Xu chenxi Li Yanfeng ma Hongtao Zhang Yongsheng Chen The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer materials Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China Renewable Energy Conversion and Storage Center(RECAST) Nankai UniversityTianjin 300071China

Organic and carbon-based lithium-ion batteries possess abundant resources,nontoxicity,environmental friendliness,and high performance,and they have been widely studied in the past ***,it remains a challenge to construct such batteries with high capacity,high cycling stability,and high conductivity ***,we elaborately design and integrate organic polymer(p-FcPZ) with graphene network to create a hybrid material(p-FcPZ@G) for high-performance lithium-ion batteries(LIBs).The bi-polar polymer p-FcPZ containing multiple redox-active sites endows p-FcPZ@G with both remarkable cycling stability and high *** porous conductive graphene network with a large surface area facilitates rapid ions/electrons transportation,resulting in superior rate ***,the half-cell based on p-FcPZ@G cathode exhibits simultaneously high capacity(~250 ma h g^(-1) at 50 ma g^(-1)),excellent cycling stability(retention of 99.999% per cycle for 10,000 cycles at 2,000 ma g^(-1)) and superior rate ***,the graphene-based full cell assembled with p-FcPZ@G cathode and graphene anode also demonstrates comprehensively high electrochemical performance.

关键词： lithium-ion batteries organic electrode graphene hybrid material high performance full cells

谢晶日教授从气机升降学说论治胃癌前病变经验

在线全文

学校读者我要写书评

暂无评论

中国医药导报 2023年第2期20卷 144-147页

作者：王海强熊丽马晨曦张萌张杨郑丽红黑龙江中医药大学附属第一医院肝脾胃病科黑龙江哈尔滨150040 黑龙江中医药大学研究生院黑龙江哈尔滨150040 黑龙江中医药大学附属第四医院消化内科黑龙江哈尔滨150001

胃癌前病变是临床上常见的消化系统疾病。谢晶日教授认为胃癌前病变病位在胃,与脾、肝、肺密切相关,气机壅滞、升降失调是发病基础,脏腑气机异常,虚、湿、痰、瘀、毒致病因素及气血失和、寒热失衡是主要诱因。因此,谢教授提出了治疗胃... 详细信息

胃癌前病变是临床上常见的消化系统疾病。谢晶日教授认为胃癌前病变病位在胃,与脾、肝、肺密切相关,气机壅滞、升降失调是发病基础,脏腑气机异常,虚、湿、痰、瘀、毒致病因素及气血失和、寒热失衡是主要诱因。因此,谢教授提出了治疗胃癌前病变的三大法则:一当调气血以通上下,二当平寒热以和阴阳,三当衡润燥以复升降,并在临证处方时根据气血、寒热的多少以调整方药的用法用量,可有效缓解临床症状,延缓或逆转胃萎缩、肠上皮化生、异型增生的病理改变。

关键词：胃癌前病变气机升降名医经验谢晶日

谢晶日教授从“少阳为枢,以平为期”论治溃疡性结肠炎经验

在线全文

学校读者我要写书评

暂无评论

湖南中医药大学学报 2022年第9期42卷 1512-1516页

作者：王海强张萌熊丽马晨曦王瑶郑丽红黑龙江中医药大学附属第一医院黑龙江哈尔滨150040 黑龙江中医药大学黑龙江哈尔滨150040 黑龙江中医药大学附属第四医院黑龙江哈尔滨150040

溃疡性结肠炎是一种易反复发作的慢性肠道炎症性疾病。谢晶日教授在临证中发现,部分溃疡性结肠炎的发病基础在于少阳枢机不利,其关键源于胆、三焦与肝、脾、胃的生理功能失调,从而导致气血不平、虚实夹杂、寒热错杂,诱发溃疡性结肠炎。... 详细信息

溃疡性结肠炎是一种易反复发作的慢性肠道炎症性疾病。谢晶日教授在临证中发现,部分溃疡性结肠炎的发病基础在于少阳枢机不利,其关键源于胆、三焦与肝、脾、胃的生理功能失调,从而导致气血不平、虚实夹杂、寒热错杂,诱发溃疡性结肠炎。在整体观念及辨证论治的指导下,通过疏利少阳气机,复调气血之和,佐以清热、泻实、补虚、温阳等治法,达到“以平为期”的治疗目标。

关键词：溃疡性结肠炎痢疾少阳为枢以平为期治疗经验谢晶日气机

A 2D covalent organic framework with ultra-large interlayer distance as high-rate anode material for lithium-ion batteries

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第11期15卷 9779-9784页

作者： manman Wu Yang Zhao Hongtao Zhang Jie Zhu Yanfeng ma chenxi Li Yamin Zhang Yongsheng Chen The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer materials Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China Renewable Energy Conversion and Storage Center(RECAST) Nankai UniversityTianjin 300071China State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China

Covalent organic frameworks(COFs)have been broadly investigated for energy storage ***,many COF-based anode materials suffer from low utilization of redox-active sites and sluggish ions/electrons transport caused by their densely stacked ***,it is still a great challenge to obtain COF-based anode materials with fast ions/electrons transport and thus superior rate ***,a redox-active piperazine-terephthalaldehyde(PA-TA)COF with ultra-large interlayer distance is designed and synthesized for high-rate anode material,which contains piperazine units adopting a chair-shaped conformation with the nonplanar linkages of a tetrahedral *** unique structure renders PA-TA COF an ultra-large interlayer distance of 6.2Å,and further enables it to achieve outstanding rate and cycling *** a high specific capacity of 543 mah·g^(−1) even after 400 cycles at 1.0 A·g^(−1),it still could afford a specific capacity of 207 mah·g^(−1) even at a high current density of 5.0 A·g^(−1).Our study indicates that expanding the interlayer distance of COFs by rational molecular design would be of great importance to develop high-rate electrode materials for lithium-ion batteries.

关键词： lithium-ion batteries high-rate anode material covalent organic frameworks ultra-large interlayer distance

A new type-γ'/γ''coprecipitation behavior and its evolution mechanism in wrought Ni-based ATI 718Plus superalloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2022年第24期119卷 98-110页

作者： Qianying Guo Zongqing ma Zhixia Qiao Chong Li Teng Zhang Jun Li chenxi Liu Yongchang Liu State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300354China School of Mechanical Engineering Tianjin University of CommerceTianjin 300134China Southwestern institute of physics ChengduSichuan610041China

In the precipitation-hardened Ni-based superalloy,typified by ATI 718 Plus,the nano-scaleγandγphase in duplet or triple coprecipitate morphology can provide superior high-temperature ***,it is of great sense to study the evolution ofγ’/γ’’coprecipitate during long term service at elevated *** this study,the new-typeγ’/γ’’coprecipitates with a sandwich or compact configuration were found firstly in wrought ATI 718 Plus superalloy during long term thermal exposure at 705℃.These co-structure of theγ’/γ’’precipitates evidently inhibit the coarsening ofγ’*** increase of thermal exposure time evidently leads to the increase of the volume fraction ofγ’/γ’’coprecipitate and transformation of sandwich-typeγ’/γ’’coprecipitate to compact-typeγ’/γ’’coprecipitate,which is characterized asγphase precipitate at several faces of theγ*** main evolution mechanism ofγ’/γ’’coprecipitates is element segregation,especially the composition variations of Al+Ti and Nb and their ratio of Al+Ti/*** addition,the interfacial energy betweenγ’’phase andγmatrix also plays a key role on theγ’/γ’’coprecipitates *** calculated results show that the longer thermal exposure time leads to the higher interfacial energy,which is beneficial for nucleation and precipitation ofγ’’phase on the faces ofγ’phase.

关键词： Wrought 718Plus superalloy γ’/γ’’coprecipitates Long-term thermal exposure Precipitate evolution

腹针联合穴位透药治疗便秘型肠易激综合征临床研究

在线全文

学校读者我要写书评

暂无评论

针灸临床杂志 2022年第12期38卷 20-24页

作者：王海强马晨曦石璠熊丽张萌刘贵军黑龙江中医药大学附属第一医院黑龙江哈尔滨150040 黑龙江中医药大学黑龙江哈尔滨150040 黑龙江中医药大学附属第四医院黑龙江哈尔滨150070

目的:观察腹针联合穴位透药治疗便秘型肠易激综合征的临床疗效。方法:将86例研究对象随机分为对照组与治疗组,各43例,对照组采用西医常规治疗方案;治疗组于西医常规治疗的基础上采取腹针与穴位透药联合治疗,两组患者疗程均为14 d,观察... 详细信息

目的:观察腹针联合穴位透药治疗便秘型肠易激综合征的临床疗效。方法:将86例研究对象随机分为对照组与治疗组,各43例,对照组采用西医常规治疗方案;治疗组于西医常规治疗的基础上采取腹针与穴位透药联合治疗,两组患者疗程均为14 d,观察并记录两组患者治疗前后的腹痛、腹胀、排便次数、粪便性状、排便时间、排便不尽感、IBS-SSS总评分、IBS-QOL总评分与CD4^(+)/CD8^(+)数值的变化。结果:治疗后,治疗组总有效率为93.02%(40/43),对照组为86.04%(37/43),治疗组明显高于对照组,差异具有统计学意义(P<0.05);同时治疗组在治疗前后的腹痛、腹胀、排便次数、粪便性状、排便时间、排便不尽感、IBS-SSS总评分、IBS-QOL总评分与CD4+/CD8+数值的改善方面明显优于对照组,差异具有统计学意义(P<0.05)。结论:便秘型肠易激综合征患者采用西医常规治疗加入腹针联合穴位透药治疗,能够缓解便秘型肠易激综合征患者症状,提高临床疗效。

关键词：便秘型肠易激综合征腹针穴位透药

Controlled synthesis of high-quality W-Y2O3 composite powder precursor by ascertaining the synthesis mechanism behind the wet chemical method

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2020年第1期36卷 118-127页

作者： Zhi Dong Nan Liu Weiqiang Hu Zongqing ma Chong Li chenxi Liu Qianying Guo Yongchang Liu State Key Lab.of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin300072China

As an emerging preparation technology,wet chemical method has been employed widely to produce lots of alloy materials such as W and Mo based alloys,owing to its unique technical *** the synthesis mechanism behind wet chemical method is indispensable for controlled synthesis of highquality W-Y2 O3 composite powder *** co-deposition mechanism of yttrium and tungsten component behind the wet chemical method of preparing yttrium-doped tungsten composite nanopowder was investigated systematically in this work.A series of co-deposited composite powders fabricated under different acidity conditions were used as research targets for investigating the effect of surface composition and structure on co-deposition *** was found that white tungstic acid has more W-OH bonds and much higher co-deposition efficiency with Y^3+ions than yellow tungstic *** is illustrated that the coordination reaction between W-OH bonds on tungstic acid particles and Y^3+ions brings the co-deposition of yttrium and tungsten component into *** displacing H^+ions in W-OH bonds,Y^3+ions can be adsorbed on the surface of or incorporated into tungstic acid particles in form of ***,to control and regulate Y2 O3 content in powder precursor accurately,H^+ion concentration in wet chemical reaction should be in range of 0.55-2.82 mol L^-1 to obtain white tungstic ***,H^+ion concentration also has prominent effect on the grain size and morphology of reduced powder *** optimal value should be around 1.58 mol L^-1,which can lead to minimum W grain size(about 17 nm) without bimodal *** chemical mechanism proposed in this work could produce great sense to preparation of high-quality precursor for sintering high-performance Y2 O3 dispersion strengthened W based *** work may also shed light on the approach to exploit analogous synthesis mechanism in other alloy systems.

关键词： W-Y2O3 Wet chemical method W-OH bond Ligand Co-deposition mechanism