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Influence of reaction of Al2O3 and carbonaceous materials in Al2O3–C refractories on aluminum and carbon pick-up of iron

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Journal of Iron and Steel Research International 2020年第1期27卷 55-61页

作者： Yao-wu Wei yan-jun dong Tao Zhang Jun-feng Chen wen yan The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

Carbon-containing Al2O3 refractory crucibles and pure Al2O3 refractory crucible were fabricated to study the effect of carbon-containing Al2O3-C refractories on aluminum and carbon pick-up of *** crucibles with pure iron powder were placed in a vacuum induction furnace and heated at 1600℃ for regular time under flowing argon *** Al and C contents of iron samples were analyzed,and iron samples were also investigated using a field scanning electron microscope equipped with energy-dispersive *** results showed that carbon materials did affect the interac?tion of(Al2O3-C)/Fe system,carbothermal reduction in alumina occurred in the reaction system and the extent of reactions depended on the kinds of carbon materials.

关键词： Al2O3-C refractory Liquid iron Aluminum pick-up Carbon pick-up Carbothermal reduction

左房增大合并房性早搏与阵发性房颤关系的探讨

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内蒙古医学杂志 2014年第10期46卷 1179-1180页

作者：董彦文牧骑祁宏王凯韩旭晨赤峰学院附属医院心内科内蒙古赤峰024000

目的探讨左房增大同时合并房性早搏与阵发性房颤的关系。方法根据心脏彩超及12导联动态心电图将120例房性早搏患者分为左房增大合房性早搏组(A组n=80例),无左房增大合并房性早搏组(B组n=40例)。对比两组阵发性房颤的发生率、及发生阵发... 详细信息

目的探讨左房增大同时合并房性早搏与阵发性房颤的关系。方法根据心脏彩超及12导联动态心电图将120例房性早搏患者分为左房增大合房性早搏组(A组n=80例),无左房增大合并房性早搏组(B组n=40例)。对比两组阵发性房颤的发生率、及发生阵发性房颤患者中触发情况的比较。结果左房增大合并房性早搏组阵发性房颤发生显著高于无左房增大组,P<0.01(χ2=20.44);左房增大患者中由房性早搏触发阵发性房颤显著高于无左房增大组,P<0.05(χ2=4.083);由"P'on T"现象的房性早搏触发阵发性房颤发生显著高于非房性早搏触发的阵发性房颤。结论左房增大同时存在"P'on T"现象的房性早搏患者更易发生阵发性房颤,应早期药物干预降低阵发性房颤的发生率。

关键词：左房增大房性早搏阵发性房颤

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外墙保温板的组成材料及研究

山西建筑 2013年第35期39卷 202-203页

作者：周思禹刘思佳董燕雯尤志国河北联合大学建筑工程学院河北唐山063009

介绍了传统保温板的主要组成材料有芯材、面板和背板,并作了具体阐述,对新型保温板的研究与应用情况进行了分析,最后指出保温板外墙保温技术的应用有利于降低建筑能耗、提高品质与效益,具有广阔的应用前景。

关键词：保温板组成材料保温节能

Influencing factors of sediment deposition and their spatial variability in riparian zone of the Three Gorges Reservoir,China

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Journal of Mountain Science 2016年第8期13卷 1387-1396页

作者： WANG Bin-yan yan dong-chun wen An-bang CHEN Jia-cun Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China

Many factors can affect the sediment deposition and soil erosion process in riparian zone, including terrain, sediment transport and water level fluctuations. Clarifying the factors influencing sediment deposition process in the riparian zone of the Three Gorges Reservoirs is an important problem to determine the key area of sediment deposition and its trend of development in the study area. In order to reveal the influence of these environmental factors on the sediment deposition in riparian zone of the Three Gorges Reservoir, this study investigated 1） the amount of deposited sediment in different environmental conditions, 2） the potential factors affecting sediment deposition in riparian zone of the Three Gorges Reservoir, 3） the relationship between the deposited sediment amount and these factors previously mentioned using correlation analysis, and 4） the influence of human activities considered as an additional factor. This study found that 1） slope gradient, elevation, inundating duration and human activities were the main factors influencing sedimentation in riparian zone of the Three Gorges Reservoir, and 2） the impact of each factor varied with spaces. Specifically, in the upper reach from Jiangjin to Fuling, human activities such as gravel dredging, bank revetment and ports and wharfs constructing disturbed considerable amounts of deposited sediment, as a result, there was no natural law to dictate the distribution. In the middle reach from Fuling to Fengjie, slope gradient and inundating duration were the controlling factors, and the sediment deposition amount was greater in the areas with a gentler slope or lower elevation. Water flow on gentler slopes generally had lower velocity, resulting in more sediment to deposit. Sites with lower elevations would be drowned by sediment-laden flow with a longer duration resulting from hydrologic regime controlled by the operating strategy of the Three Gorges Reservoir, leading to a larger amount of sediment deposit

关键词： Influencing Factors Spatial variability Sediment deposition Riparian zone Three GorgesReservoir

Textures and Properties of Hot Rolled High Strength Ti-IF Steels

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Journal of Iron and Steel Research International 2008年第5期15卷 70-76页

作者： GUO yan-hui WANG Zhao-dong ZOU wen-wen LIU Xiang-hua WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The texture evolution in a high strength Ti-IF steel during the processing of hot rolling, cold rolling, and annealing is studied. For comparison, both ferrite rolling and austenite rolling are employed. It is found that the texture type is the. same after ferrite rolling and austenite rolling, but the texture intensity is much higher in the ferrite rolled sample. Furthermore, texture characteristics at the surface are absolutely different from those at the mid sec tion in both ferrite rolled and austenite rolled samples, as well as under the cold rolled and annealed conditions. The shear texture { 110 } 〈001 〉 disappears and orientation rotates along { 110 } 〈001 〉→ { 554 } 〈 225 〉→ { 111 } 〈 112 〉→{111}〈110〉→{223}〈110〉 during cold rolling. Compared to the austenite rolled sample, the properties of the cold rolled and annealed sheet which is subjected to ferrite rolling are higher.

关键词： high strength Ti-IF steel ferrite rolling austenite rolling texture

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阿魏酸钠预防对比剂对肾脏损害的研究

内蒙古医学杂志 2013年第2期45卷 179-181页

作者：董彦文王凯牧骑祁宏安静姚树青赤峰学院附属医院心内科内蒙古赤峰024000 河北省康保县中医院河北康保076650

目的:研究阿魏酸钠预防对比剂对肾脏的损害。方法:将126例行冠状动脉介入治疗的患者随机分对照组和治疗组,治疗组术前24 h及术后予阿魏酸钠300 mg每日1次静点。观察术前、术后血清肌酐(Scr),内生肌酐清除率(Ccr),尿β2微球蛋白变化的情... 详细信息

目的:研究阿魏酸钠预防对比剂对肾脏的损害。方法:将126例行冠状动脉介入治疗的患者随机分对照组和治疗组,治疗组术前24 h及术后予阿魏酸钠300 mg每日1次静点。观察术前、术后血清肌酐(Scr),内生肌酐清除率(Ccr),尿β2微球蛋白变化的情况。结果:内生肌酐清除率(Ccr)术后1、2 d时,治疗组显著高于对照组(P<0.05),尿β2微球蛋白术后1、2 d时治疗组显著低于对照组(P<0.05)。结论:阿魏酸钠可以用来预防对比剂对肾脏的损害。

关键词：阿魏酸钠对比剂肾损害

Differential CircRNA Expression Profiles in PK-15 Cells Infected with Pseudorabies Virus Type Ⅱ

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Virologica Sinica 2021年第1期36卷 75-84页

作者： Haimin Li wen Tang Yulan Jin Weiren dong yan yan Jiyong Zhou MOA Key Laboratory of Animal Virology Center of Veterinary SciencesZhejiang UniversityHangzhou 310058China

Circular RNAs(circ RNAs)belong to a class of non-coding RNAs with diverse biological ***,little is known about their roles in case of pseudorabies virus(Pr V)***,we analyzed the expression profile of host circ RNAs from a virulent Pr V type II strain DX(Pr V-DX)infected and an attenuated g E/TK deficient(g E-TK-Pr V)strain of Pr V infected PK-15 *** RNAs were identified by findcirc and analyzed with DESeq *** with the mock cells,449 differentially expressed(DE)circ RNAs(233 down-regulated and 216 up-regulated)from Pr V-DX infected and578 DE circ RNAs(331 down-regulated and 247 up-regulated)from g E-TK-Pr V infected PK-15 cells were *** addition,459 DE circ RNAs(164 down-regulated and 295 up-regulated)between the Pr V-DX and g E-TK-Pr V infected cells were *** expression patterns of 13 circ RNAs were validated by reverse transcription quantitative real-time PCR(RT-q PCR)and results were similar as of *** putative target mi RNA binding sites of DE circ RNAs were predicted by using mi Randa and ps *** circ RNA-mi RNA-m RNA network was constructed and certain mi RNAs that have possible roles in antiviral immune response,such as mi R-210 and mi R-340,were *** and KEGG pathway analysis demonstrated that DE circ RNAs were enriched in the processes such as cellular metabolism,protein binding,RNA degradation and regulation of actin ***,these findings might provide the useful information for a better understanding of mechanisms underlying the interaction between Pr V-II and host cells.

关键词： Pseudorabies virus infection RNA-seq CircRNA

Effect of Nb addition on microstructure and mechanical properties of 25CrNiMoV(DZ2)steel for high-speed railway axles

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Journal of Iron and Steel Research International 2022年第5期29卷 802-809页

作者： Jin-wen Zhang yan-guang Cao Cheng-guo Zhang Zhao-dong Li wen-xian Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Technology Center Taiyuan Iron and Steel(Group)Co.Taiyuan030003ShanxiChina Department of Structural Steels Central Iron and Steel Research InstituteBeijing100081China Locomotive and Car Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China

The microstructure,precipitates and properties of 25CrNiMoV(DZ2)steel for high-speed railway axles with different Nb contents were investigated by means of optical microscopy,scanning electron microscopy,electron back-scattering diffraction,transmission electron microscopy and physicochemical phase *** results show that the grain size of the original austenite of the test steels decreases from 20.5 to 14.2 and 10.8μm after adding 0.026 and 0.039 wt.%Nb to a 25CrNiMoV steel,***,the block width of the tempered martensite in the test steels is refined from 1.91 to 1.72 and 1.60µm,***-type precipitates in 25CrNiMoV steel are mainly VC,while(Nb,V)C gradually precipitates when Nb is microalloyed,and the amount of precipitates increases with increasing Nb *** strengthening mechanism analysis,it is found that grain refinement strengthening is the primary way to increase the *** improvement in the yield strength with increasing Nb content is attributed to a significant increase in precipitation strengthening,grain refinement strengthening and dislocation strengthening.

关键词： High-speed railway axle steel Nb microalloying Precipitate Strengthening mechanism

Future temperature changes over the critical Belt and Road region based on CMIP5 models

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Advances in Climate Change Research 2018年第1期9卷 57-65页

作者： dong Tian-Yun dong wen-Jie GUO yan CHOU Jie-Ming yanG Shi-Li TIAN Di yan dong-dong State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China School of Atmospheric Sciences Sun Yat-Sen UniversityGuangzhou 510275China Zhuhai Joint Innovative Center for Climate-Environment-Ecosystem Future Earth Research InstituteBeijing Normal UniversityZhuhai 519087China Business School Beijing Normal UniversityBeijing 100875China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyHangzhou310012China

Based on data of 22 models from the Coupled Model Inter-comparison Project Phase 5(CMIP5),the performance of climate simulation is assessed and future changes under RCP2.6,RCP4.5 and RCP8.5 are projected over critical Belt and Road *** with observations,the CMIP5 models simulate the linear trend and spatial distribution of the annual mean surface air temperature(SAT)better in the north(NBR)and south(SBR)of the Belt and Road *** trend of the 22-model ensemble mean(CMIP5 MME)is 0.70/0.50 C per 100 years from 1901 to 2005,and the observed trend is 1.11/0.77 C per 100 years in the NBR/SBR *** 1971,the relative error between CMIP5 MME and observations is 22%/15%in the NBR/SBR ***/nine models are selected in the NBR/SBR to project future SAT changes under three RCP *** 2081e2100,warming in the NBR/SBR is projected to be(1.16±0.29)/(0.72±0.32)C,(2.41±0.54)/(1.55±0.44)C,and(5.23±1.02)/(3.33±0.65)C for RCP2.6,RCP4.5,and RCP8.5,*** the RCP scenarios,the NBR region shows greater warming than the SBR *** most significant warming is expected in Kazakhstan and the northern part of the *** associated uncertainty generally increases with time under the three RCP ***,increases in warming over the Belt and Road region are more remarkable under higher-emission scenarios than lower-emission ones.

关键词： CMIP5 models The Belt and Road region Temperature projection RCPs