Effect of Controlled Cooling After Hot Rolling on Mechanical Properties of Hot Rolled TRIP Steel

A three-step cooling pattern on the runout table（ROT）was conducted for the hot rolled TRIP steel.Microstructural evolution during thermomechanical controlled processing（TMCP）was investigated.Processing condition of controlled cooling on a ROT in the laboratory rolling mill was discussed.The results indicated that the microstructure containing polygonal ferrite,granular bainite and a significant amount of the stable retained austenite can be obtained through three-step cooling on the ROT after hot rolling.TMCP led to ferrite grain refinement.Controlled cooling after hot rolling resulted in the stability of the remaining austenite and a satisfactory TRIP effect.Excellent mechanical properties were obtained through TMCP for the hot rolled TRIP steel.     

亚硝基R盐分光光度法快速测定硫酸锌溶液中的钴

研究了亚硝基R盐与钴在pH值5~6的溶液中发生显色反应,反应产物在520 nm处有最大吸收峰。该测定方法快速、简便,能满足湿法炼锌生产的要求。     

一次220 kV保护误动作检查及处理

保护装置应定期检查,保证良好的运行工况。在条件允许的情况下,故障录波器的设置有利于故障分析、查找故障原因。     

广西三水铝土矿矿床地质特征及成因探讨

文章从成矿地质条件,成矿物质来源等方面探讨广西三水铝土矿成因。认为广西三水铝土矿是在碳酸盐岩遭受长期强烈化学风化后形成大量的三水铝矿石和铝质铁、锰质矿石等,并在有利的红土化地形地貌富集形成矿体和矿床。     

Al2TiO5-SiO2-Al2O3复合材料的研究

以Al2TiO5微细粉、SiO2-Al2O3微细粉为原料,外加6%(质量分数,下同)PVA结合剂,100 MPa压力成型,1400 ℃保温1 h烧成,制备出低热膨胀系数,抗热震性能优于SiO2-Al2O3材料的Al2TiO5-SiO2-Al2O3复合材料.对复合材料的性能测定分析,研究不同的Al2TiO5含量、烧结温度等对Al2TiO5-SiO2-Al2O3复合材料性能的影响,获得了制备性能优良的Al2TiO5-SiO2-Al2O3复合材料的最佳工艺参数.     

云母钛珠光颜料前驱体煅烧工艺的研究

以硫酸沸腾水解法制备出的珠光颜料前驱体为研究对象,采用差热-热重分析仪对前驱体进行热分析,初步确定煅烧温度范围;借助X射线粉末衍射分析仪对煅烧后的产物进行晶相鉴定与分析,并利用扫描电镜观察煅烧后的产物的微观形貌,以此来反馈煅烧温度和煅烧时间对产物的影响.研究结果表明:在850 ℃下煅烧1 h样品的珠光效果强烈,其表面的TiO2多晶膜致密光滑无裂痕;且TiO2已完全转化为金红石型晶体,从而提高了珠光颜料的耐热性和耐候性.     

Thermal Contact Resistance between Aero Engine Compressor Blade and Flexible Fixture

In the process of two-pass micro plasma arc welding of titanium alloy sheet,based on the thermal contact resistance theory,a three-dimensional transient heat tr...     

Genome-Wide Identification of TaSAUR Gene Family Members in Hexaploid Wheat and Functional Characterization of TaSAUR66-5B in Improving Nitrogen Use Efficiency

Excessive input of nitrogen fertilizer not only causes a great waste of resources but brings about a series of ecological and environmental problems. Although Small Auxin Up-regulated RNAs (SAURs) participate in diverse biological processes, the function of SAURs in the nitrogen starvation response has not been well-studied. Here, we identified 308 TaSAURs in wheat and divided them into 10 subfamilies. The promoter regions of most TaSAURs contain hormone responsive elements, and their expression levels change under the treatment of different hormones, such as IAA, MeJA, and ABA. Interestingly, overexpression of one of the TaSAUR family members, a nitrogen starvation responsive gene, TaSAUR66-5B, can promote the growth of Arabidopsis and wheat roots. In addition, overexpression of TaSAUR66-5B in Arabidopsis up-regulates the expression levels of auxin biosynthesis related genes, suggesting that overexpression TaSAUR66-5B may promote root growth by increasing the biosynthesis of auxin. Furthermore, overexpression of TaSAUR66-5B in wheat can increase the biomass and grain yields of transgenic plants, as well as the nitrogen concentration and accumulation of both shoots and grains, especially under low nitrogen conditions. This study provides important genomic information of the TaSAUR gene family and lays a foundation for elucidating the functions of TaSAURs in improving nitrogen utilization efficiency in wheat.     

亭台楼阁类建筑的文学价值

亭台楼阁作为中国古代的传统建筑,其特殊的体式、功能及其与自然环境所构成的独特意境,成为历代文人登高临远的重要场所,形成了大量诗文,这些作品往往寄寓了游子怀乡、壮士悲歌、文士不遇等情感,许多名篇对后人产生了强大的精神感召力,成为中华民族精神文化遗产的一部分。     

CALMODULIN1 and WRKY53 Function in Plant Defense by Negatively Regulating the Jasmonic Acid Biosynthesis Pathway in Arabidopsis

Jasmonic acid (JA) is an important hormone that functions in plant defense. cam1 and wrky53 mutants were more resistant to Spodoptera littoralis than in the wild-type (WT) Arabidopsis group. In addition, JA concentration in cam1 and wrky53 mutants was higher compared with the WT group. To explore how these two proteins affect the resistance of Arabidopsis plants, we used a yeast two-hybrid assay, firefly luciferase complementation imaging assay and in vitro pull-down assay confirming that calmodulin 1 (CAM1) interacted with WRKY53. However, these two proteins separate when calcium concentration increases in Arabidopsis leaf cells. Then, electrophoretic mobility shift assay and luciferase activation assay were used to verify that WRKY53 could bind to lipoxygenases 3 (LOX3) and lipoxygenases 4 (LOX4) gene promoters and negatively regulate gene expression. This study reveals that CAM1 and WRKY53 negatively regulate plant resistance to herbivory by regulating the JA biosynthesis pathway via the dissociation of CAM1-WRKY53, then the released WRKY53 binds to the LOXs promoters to negatively regulate LOXs gene expression. This study reveals WRKY53′s mechanism in insect resistance, a new light on the function of WRKY53.