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Effects of Pore-forming Agents on Properties of Silicon Carbide Porous Ceramics Prepared from Crystalline Silicon Cutting Waste

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China's Refractories 2019年第4期28卷 12-16页

作者： MA Beiyue WU Hua GAO Zhi REN Xinming zhang yaran School of Metallurgy Northeastern University

SiC powder was rapidly synthesized in an induction furnace with crystalline silicon cutting waste and active carbon as raw materials,and then SiC porous ceramics were prepared at 1600 t for 4 h with carbon embedded using the powder as raw material,the starch and the graphite as pore-forming *** of additions of different pore-forming agents on the phase composition,microstructures,physical properties,and cold crushing strength of the porous ceramics were *** results show that the main crystalline phases of the synthetic powder areα-S iC(6H-SiC)andβ-SiC(3C-SiC).The phase composition of the porous ceramics includesα-S iC(6H-SiC),β-SiC(3C-SiC),FeSi,quartz and *** apparent porosity and closed porosity of the porous ceramics prepared by adding starch are higher,and the cold compressive strength of the porous ceramics added with graphite is *** increasing the additions of the starch,the apparent porosity,closed porosity and linear shrinkage ratio of the porous ceramics increase,and the bulk density decreases *** 20 mass%starch is added,the apparent porosity,closed porosity,linear shrinkage ratio and cold compressive strength are 57.05%,2.03%,5.10%and 10.20 MPa,respectively.

关键词： silicon carbide porous ceramics pore-forming agent crystalline silicon cutting waste

地方高校材料物理专业新工科“四创融合”人才培养模式的构建与实践

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化工管理 2024年第13期 25-28页

作者：张赞王占忠郭亚南张亚然杨立芹李朋张英磊徐新祥邢台学院物理与电子工程学院河北邢台054001 邢台学院教育科学教学部河北邢台054001

针对材料物理专业学生创新意识不强、创新能力不高、创业思维不明和创业实践能力不足等问题,通过强化思创融合、细化专创融合、优化科创融合和深化产创融合开展人才培养模式的构建和实践,增强学生的创新意识、创新能力、创业思维、创业... 详细信息

针对材料物理专业学生创新意识不强、创新能力不高、创业思维不明和创业实践能力不足等问题,通过强化思创融合、细化专创融合、优化科创融合和深化产创融合开展人才培养模式的构建和实践,增强学生的创新意识、创新能力、创业思维、创业实践能力,真正实现创新创业教育贯穿到材料物理专业人才培养的全过程,践行地方高校人才培养与区域产业、经济发展同向同行,着力加快“新工科”人才培养,同时能够为其他专业提供借鉴意义。

关键词：材料物理新工科 “四创融合” 培养模式

以EIM为导向的情绪管理及放松训练在双向情感障碍抑郁发作患者中的应用效果

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国际护理学杂志 2024年第11期43卷 1948-1952页

作者：刘伟杰李启青张雅然冯春杰刘多君聊城市第四人民医院精神科聊城252000 聊城市第四人民医院护理部聊城252000 聊城市第四人民医院质控科聊城252000 曲阜师范大学曲阜273165

目的分析以情绪智力模型(Emotional Intelligence Model,EIM)为导向的情绪管理及放松训练在双向情感障碍抑郁发作患者中的应用效果。方法随机抽样选取聊城市第四人民医院2019年12月至2022年12月收入的双向情感障碍抑郁发作患者135例为... 详细信息

目的分析以情绪智力模型(Emotional Intelligence Model,EIM)为导向的情绪管理及放松训练在双向情感障碍抑郁发作患者中的应用效果。方法随机抽样选取聊城市第四人民医院2019年12月至2022年12月收入的双向情感障碍抑郁发作患者135例为研究对象,将其分为观察组67例和对照组68例。对照组予常规治疗与护理,观察组在对照组的基础上添加以EIM为导向的情绪管理及放松训练。比较两组汉密尔顿抑郁量表(Hamilton Depression Rating Scale,HAMD)评分、抑郁发作频率及正性负性情绪自评量表(Positive Negative Affect Schedule,PANAS)、社会功能量表(Social Functioning Rating Scale,SFRS)评分及护理满意度。评价以EIM为导向的情绪管理及放松训练在双向情感障碍抑郁发作患者中的应用价值。结果治疗后,两组HAMD-24评分、抑郁发作频率均降低,且观察组低于对照组,差异均有统计学意义(均P<0.05)。治疗后,两组正性情绪评分上升,负性情绪评分降低,且观察组变化更明显,差异均有统计学意义(均P<0.05)。治疗后,两组社会功能缺陷评分、日常生活能力评分均降低,且观察组更低,差异均有统计学意义(均P<0.05)。观察组总满意率为97.01%(65/67),对照组为83.82%(57/68),观察组总满意率高于对照组,差异有统计学意义(P<0.05)。结论对双相情感障碍抑郁发作患者实施以EIM为导向的情绪管理及放松训练能够明显改善抑郁状态、抑郁发生频率、正性与负性情绪,加强患者的社会功能。

关键词：情绪智力模型(EIM) 情绪管理放松训练双向情感障碍抑郁发作

Investigation of improving the thermophysical properties and corrosion resistance of RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates by component design with RE doping

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Journal of Advanced Ceramics 2024年第6期13卷 842-860页

作者： Zeyu Chen Yiling Huang Zhaoxuan zhang Wei Zheng Xuemei Song yaran Niu Yi Zeng The State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Inorganic Coating Materials CAS Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

In this research,a novel method for regulating components in RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates was developed,combining the benefits of a suitable thermal expansion coefficient(CTE)and outstanding corrosion resistance against calcium–magnesium–alumino–silicate(CMAS).This approach enhanced the overall thermophysical ***,the results from the CMAS corrosion resistance test indicated that(Lu_(1/3)Yb_(1/3)Tm_(1/3))_(2)SiO_(5)/(Lu_(1/3)Yb_(1/3)Tm_(1/3))_(2)Si_(2)O_(7)and(Lu_(1/4)Yb_(1/4)Tm_(1/4)Er_(1/4))_(2)SiO_(5)/(Lu_(1/4)Yb_(1/4)Tm_(1/4)Er_(1/4))_(2)Si_(2)O_(7)exhibited exceptional resistance to CMAS penetration,even at temperatures up to 1500℃.To comprehend the corrosion mechanism of CMAS on these silicates,we introduced a reaction–diffusion model,which involved observing the changes in the interface between the corrosion product layer and the silicate *** was achieved using electron backscatter diffraction(EBSD).These findings lay a theoretical basis for selecting rare earth elements in RE_(2)SiO_(5)/RE_(2)Si_(2)O_(7)multiphase silicates based on the radii of different rare earth cations.

关键词： thermal conductivity environmental barrier coatings(EBCs) thermal expansion coefficient(CTE) multiphase silicates calcium-magnesium-alumino-silicate(CMAS)corrosion resistance reaction-diffusion

DNA methylation and alternative splicing modulate FBXW11 gene expression in Holstein bull testis and are correlated with sperm quality

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BIOCELL 2021年第1期45卷 79-87页

作者： YONG LIU ZHIHUA JU QIANG JIANG WENHAO LIU CHUNHONG YANG yaran zhang XIUGE WANG YAPING GAO XIAOCHAO WEI YAN SUN JINPENG WANG MINGHAI HOU LING YANG JINMING HUANG Dairy Cattle Research Center Shandong Academy of Agricultural SciencesJinan250100China College of Life Sciences and Food Engineering Hebei University of EngineeringHandan056021China

F-box and WD-40 domain protein 11(FBXW11)is an important component of the E3 ubiquitin-ligase enzyme that plays a key role in the ubiquitin-dependent regulation of *** our previous research,the mRNA expression of FBXW11 in bull sperm with high motility is significantly higher than that with low *** the present study,the protein expression levels of FBXW11 in bull testicular tissues with low-performance sperm quality groups were significantly higher than those in normal performance *** immunohistochemistry result demonstrated that FBXW11 protein was located in the periphery of Leydig cells and seminiferous *** splice variants of the FBXW11 gene,namely,FBXW11-tv1,FBXW11-tv2,and FBXW11-tv3,were identified in testicular *** splicing patterns of the three variants are exon *** transcript FBXW11-tv2 expressions were the highest in each *** low-performance groups displayed higher FBXW11-tv1 and FBXW11-tv2 transcript expressions than the normal performance *** CpG islands were located within the 5’UTR and exon 1-2 region of the FBXW11 *** sequencing PCR results demonstrated that the methylation levels of 11 methylation sites in the CpG island 2 from−99 to−43 in the normal performance groups were significantly lower than those in the low-performance *** correlation analysis suggested that the CpG island 2 methylation level was negatively correlated with sperm motility and the transcript FBXW11-tv2 expression *** data revealed that alternative splicing and DNA methylation jointly regulated FBXW11 gene expression and were correlated with sperm quality traits during spermatogenesis in Holsteins.

关键词： FBXW11 Alternative splicing DNA methylation Bull Sperm quality traits

Effect of Main Material Ratio on Properties of SiC-Al_2O_3 Porous Ceramics via Polymeric Replication Method

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China's Refractories 2018年第3期27卷 44-47页

作者： REN Xinming MA Beiyue SU Chang YU Jingyu zhang yaran School of Metallurgy Northeastern University

In order to fabricate porous ceramics with good properties and proper production cost,SiC-Al2 O3 porous ceramics were prepared at 1 450 ℃ for 2 h from the powders of commercial silicon carbide and white fused corundum via a polymeric replication method. Effects of the mass ratio of SiC powder to white fused corundum powder（ 1 ∶ 3,1 ∶ 1 and 3 ∶ 1） on the appearance,phase composition,sintering properties and thermal shock resistance were investigated. The research results indicate that the as-prepared Si C-Al2 O3 porous ceramics have uniform pores,and their linear shrinkage ratio,apparent porosity and bulk density reach 4. 70%,67. 17%and 0. 83 g·cm-3,respectively. The thermal shock cycles from 1 400 ℃ to room temperature reach 23 including 15 cycles in air cooling condition and then 8 cycles in water cooling condition. Their main phases areα-Al2 O3 and Al6 Si2 O13 as well as a small amount of SiC and free SiO2. The as-prepared porous ceramic with the ratio of m（ SiC） ∶ m（ Al2 O3） = 1∶ 1 possesses prior comprehensive properties.

关键词： porous ceramics polymeric replication method silicon carbide white fused corundum sintering properties thermal shock resistance

Changes of grain size from peat profile in eastern mountainous area over past 2000 years,Jilin Province,Northeast China

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Global Geology 2024年第3期27卷 132-144页

作者： zhang Xinrong WANG Jiayu PING Shuaifei LI yaran College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesJilin UniversityChangchun 130061China Key Laboratory for Oil Shale and Coexisting Minerals Jilin UniversityChangchun 130061China Standing Committee of the People's Congress of Ninghe District Tianjin CityTianjin 301574China

Plenty of high-resolution paleoclimate investigations of the last thousand years were carried out to potentially predict future climate *** ombrotrophic peatland is one of the best recorders for high-resolution paleoclimate studies in the forest *** size analysis was carried out on ombrotrophic peat profile in the eastern mountainous region of Jilin Province,Northeast *** peat profile lasts the past 2000 a by four radiocarbon(AMS14C)*** results showed that the inorganic minerals in the peat profile are mainly silt,with some contribution from clay and a minor amount of sand,which are mainly due to wind dust and suspended *** paleoclimate stages are found in this peat profile by phytolith analysis,peat cellulose isotope research and historical documents:ca.45–1550 AD,relatively cold period;ca.1550 AD–present,relatively warm *** finding is important for the initial study of paleoclimatic changes over the last 2000 a in the mountainous area of eastern mountainous area,Jilin Province,Northeast China.

关键词： peat sediments grain size analysis paleoclimate

Changes of grain size from peat profile in eastern mountainous area over past 2000 years, Jilin Province, NE China

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Global Geology 2024年

作者： zhang Xinrong Wang Jiayu Ping Shuaifei Li yaran College of Earth Science Jilin University Key-Laboratory for Oil Shale and Coexisting Minerals Jilin University Ninghe District of Banqiao Town People's Government Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural Resources

Plenty of high-resolution paleoclimate investigations of the last thousand years were carried out to potentially predict future climate changes. Mountainous ombrotrophic peatland is one of the best recorders for high-resolution paleoclimate studies in the forest area. Grain size analysis was carried out on ombrotrophic peat profile in the eastern mountainous region of Jilin Province, NE China. The peat profile lasts the past 2 000 a by four radiocarbon (AMS 14C) ages. The results showed that the inorganic minerals in the peat profile are mainly silt, with some contribution from clay and a minor amount of sand, which are mainly due to wind dust and suspended transportation. Two paleoclimate stages are found in this peat profile by phytolith analysis, peat cellulose isotope research and historical documents,ca. 45–1550 AD., a relative cold period; ca. 1550 AD-present, warm. This finding is important for the initialstudyofpaleoclimaticchangesoverthelast2000ainthemountainousareaofeatern mountainous area, Jilin Province, NE China.

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MCM-41负载手性Salen-Mn(Ⅲ)配合物的制备及其对不对称环氧化的催化性能

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催化学报 2007年第1期28卷 85-90页

作者：赵继全张雅然张月成河北工业大学化工学院天津300130

三乙氧基硅丙胺与介孔分子筛MCM-41表面的羟基在甲苯中回流反应得到氨丙基官能团化的MCM-41,再利用氨基与Salen-Mn(Ⅲ)上的活性酯基生成酰胺键,将手性Salen-Mn(Ⅲ)配合物负载到MCM-41上,实现了手性均相催化剂的多相化.分别利用FT-IR,DRU... 详细信息

三乙氧基硅丙胺与介孔分子筛MCM-41表面的羟基在甲苯中回流反应得到氨丙基官能团化的MCM-41,再利用氨基与Salen-Mn(Ⅲ)上的活性酯基生成酰胺键,将手性Salen-Mn(Ⅲ)配合物负载到MCM-41上,实现了手性均相催化剂的多相化.分别利用FT-IR,DRUV-Vis,XRD,ICP和N2吸附等手段对负载型催化剂进行了表征.结果表明,手性Salen-Mn(Ⅲ)配合物成功负载到MCM-41上,但MCM-41和手性Salen-Mn(Ⅲ)配合物固有的结构保持不变.以次氯酸钠和间氯过氧苯甲酸为氧化剂,考察了负载型催化剂对1,2-二氢萘不对称环氧化反应的催化性能,结果表明,负载型催化剂的催化活性比相应均相催化剂的低,但对映体选择性有所提高.在NaClO/PyNO氧化剂体系中20℃反应12h,1,2-二氢萘环氧化物的收率达45.9%,对映体过量值为84.3%.负载型催化剂在循环使用5次后Mn的流失达34%.

关键词： MCM-41分子筛手性Salen锰(Ⅲ)配合物负载型催化剂不对称环氧化二氢萘