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660MW超临界直流锅炉水冷壁动态特性仿真研究

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动力工程学报 2024年第7期44卷 1001-1009页

作者：王超王研凯陈相如孙兴业刘铠瑞王利民车得福内蒙古电力(集团)有限责任公司呼和浩特010020 西安交通大学动力工程多相流国家重点实验室西安710049

为研究锅炉水冷壁的动态特性,将水冷壁划分为多个模块,区分了沿高度方向与沿周向的热负荷不均匀情况,建立了660 MW超临界锅炉水冷壁区域的动态仿真模型。研究了水冷壁不同墙在热负荷变化下的壁温分布,对比了不同边界条件阶跃下水冷壁的... 详细信息

为研究锅炉水冷壁的动态特性,将水冷壁划分为多个模块,区分了沿高度方向与沿周向的热负荷不均匀情况,建立了660 MW超临界锅炉水冷壁区域的动态仿真模型。研究了水冷壁不同墙在热负荷变化下的壁温分布,对比了不同边界条件阶跃下水冷壁的响应特性,考察了变负荷过程中水冷壁的水动力与壁温特性。结果表明:后墙热负荷变化只会影响后墙水冷壁与凝渣管处的壁温;当后墙热负荷上升到锅炉最大出力的1.5倍时,凝渣管出现超温现象;当热负荷、入口质量流量与入口工质温度分别阶跃降低10%时,汽水分离器处出口汽温分别变化-7.97 K、+11.57 K和-19.97 K,即入口工质温度变化对汽温的影响最大;升负荷过程中汽温先上升后下降,降负荷过程中汽温先下降后上升。

关键词：超临界锅炉动态特性变负荷水动力壁温

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电磁辅助优化高速钢组织与性能研究进展

中国冶金 2024年第8期34卷 1-10,19页

作者：叶承欢张世民朱守豪陈湘茹翟启杰上海大学先进凝固技术中心上海200444

制造业的迅猛发展对高速钢品质提出了更高的要求,对高品质高速钢的需求也逐步提升。高速钢的力学性能主要取决于其微观组织,尤其是其中碳化物的形貌、尺寸、数量、分布。随着物理和材料科学与技术的进步,电磁场在材料制备中的应用受到... 详细信息

制造业的迅猛发展对高速钢品质提出了更高的要求,对高品质高速钢的需求也逐步提升。高速钢的力学性能主要取决于其微观组织,尤其是其中碳化物的形貌、尺寸、数量、分布。随着物理和材料科学与技术的进步,电磁场在材料制备中的应用受到了冶金与材料工作者的关注,并成为近年来研究的热点。总结了国内外通过外加电磁场改善高速钢微观组织和性能的研究成果,包括利用电磁场调控高速钢凝固组织、优化高速钢热处理微观组织和高速钢刀具服役性能,并展望了这一领域未来研究重点和应用前景。

关键词：高速钢凝固热处理碳化物电磁场

循证精细化护理在糖尿病足溃疡患者VSD治疗中的应用

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糖尿病新世界 2024年第13期27卷 152-155页

作者：陈相濡杜梦雨孙梦茹蚌埠医科大学第一附属医院整形烧伤科安徽蚌埠233000

目的分析循证精细化护理在糖尿病足溃疡患者负压封闭引流(vacuum sealing drainage,VSD)治疗中的应用。方法选取2021年4月—2023年10月蚌埠医科大学第一附属医院收治的86例糖尿病足溃疡患者为研究对象,按照护理方法不同分为对照组和观察... 详细信息

目的分析循证精细化护理在糖尿病足溃疡患者负压封闭引流(vacuum sealing drainage,VSD)治疗中的应用。方法选取2021年4月—2023年10月蚌埠医科大学第一附属医院收治的86例糖尿病足溃疡患者为研究对象,按照护理方法不同分为对照组和观察组,每组43例。对照组实施常规护理,观察组实施循证精细化护理。比较两组疼痛、生活质量和足部症状评分。结果观察组疼痛、生活质量、足部症状评分均低于对照组,差异有统计学意义(P均<0.05)。结论循证精细化护理应用于糖尿病足溃疡患者VSD治疗中可以降低患者疼痛,改善患者生活质量和足部症状。

关键词：循证精细化护理糖尿病足溃疡负压封闭引流

冷却速率对ZG40CrNi2Mo大型铸件凝固组织及元素偏析的影响

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热加工工艺 2024年第15期53卷 135-140页

作者：邹富康仲红刚李莉娟龚永勇陈湘茹翟启杰上海大学先进凝固技术中心上海200444

为了研究铸件凝固过程中不同冷却速率对其凝固组织与元素偏析的影响,利用铸件凝固过程数值模拟方法和自研的高通量凝固过程热模拟实验装置,开展了ZG40CrNi2Mo优质调质钢在不同冷却速率下的凝固模拟实验。结果表明:ZG40CrNi2Mo调质钢的... 详细信息

为了研究铸件凝固过程中不同冷却速率对其凝固组织与元素偏析的影响,利用铸件凝固过程数值模拟方法和自研的高通量凝固过程热模拟实验装置,开展了ZG40CrNi2Mo优质调质钢在不同冷却速率下的凝固模拟实验。结果表明:ZG40CrNi2Mo调质钢的二次枝晶臂间距λ_(2)与局部凝固时间t的关系符合λ_(2)=36.03 t0.26;随着冷却速率的降低,Cr元素偏析呈现上升趋势,Ni元素偏析先上升后降低;Mo元素偏析最为严重,但是对于冷却速率的变化不敏感。

关键词：热模拟数值模拟冷却速率凝固组织二次枝晶臂间距元素偏析

Effect of cooling rate on solidification structure and linear contraction of a duplex stainless steel

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China Foundry 2012年第3期9卷 239-243页

作者： Zhong Honggang chen xiangru Ao Lu Zhai Qijie Shanghai Key Laboratory of Modern Metallurgy&Materials Processing Shanghai UniversityShanghai 200072China

Cooling rate is a key factor that can drastically affect the phase transformation and thermal stress of duplex stainless steels. Therefore, in this research, different sand moulds were used to explore the influence of cooling rate on the solidification of the 2304 duplex stainless steel (DSS). The macro and micro structures of the 2304 DSS were investigated. Small equiaxed grains are obtained in chromite sand mould sample with a lower pouring temperature and a higher cooling rate, whereas coarse columnar and equiaxed grains are found in silica sand and refractory powder mould samples. The size of austenite phase is significantly increased with decreasing cooling rate, while the ferrite phase content ranging from 51.6% to 53.9% does not change obviously. In addition, the linear contraction of the 2304 DSS decreases from 2.34% to 1.09% when the mean cooling rate above 1,173 K increases from 0.99 K·s-1 to 3.66 K·s-1.

关键词： duplex stainless steel solidification structure linear contraction cooling rate

全扩张法外耳再造术在52例先天性小耳畸形患者中的应用体会

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中国美容整形外科杂志 2024年第4期35卷 210-212,232页

作者：杨静贾东辉乔嘉璐彭晰明陈相儒杨艳清江汉大学医学部湖北武汉430056 武汉市第三医院/武汉大学同仁医院整形外科湖北武汉430060

目的总结采用大容量扩张器全扩张法外耳再造术对先天性小耳畸形患者的临床应用体会。方法回顾性分析自2013年9月至2022年8月,武汉市第三医院整形外科收治的52例先天性小耳畸形患者,手术分3期进行,一期行残耳耳后皮肤软组织扩张器置入术... 详细信息

目的总结采用大容量扩张器全扩张法外耳再造术对先天性小耳畸形患者的临床应用体会。方法回顾性分析自2013年9月至2022年8月,武汉市第三医院整形外科收治的52例先天性小耳畸形患者,手术分3期进行,一期行残耳耳后皮肤软组织扩张器置入术,充分扩张耳后皮肤;二期手术取出扩张器,并取右侧肋软骨雕刻耳软骨支架,埋植于扩张后皮瓣下,得到立体耳形态;三期手术进行再造耳局部修整,使整体效果更加接近于正常耳。结果52例患者术后获随访6~36个月,46例再造耳耳部结构清晰立体,与健耳对称性好,软骨支架无移位变形。4例颅耳角变浅,三期行全厚皮片移植加深颅耳角;2例支架吸收,再造耳形态欠佳。结论对于先天性小耳畸形患者采用全扩张法外耳再造术,再造耳结构清晰立体,皮肤色泽质地均匀良好,并发症较少,解决了传统扩张法需要植皮的弊端,值得临床推广应用。

关键词：小耳畸形全耳郭再造术皮肤软组织扩张器颅耳角

Enriching Iodine and Regulating Grain Aroma,Appearance Quality,and Yield in Aromatic Rice by Foliar Application of Sodium Iodide

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Rice science 2024年第3期31卷 328-342,I0046-I0054页

作者： HONG Weiyuan DUAN Meiyang WANG Yifei chen Yongjian MO Zhaowen QI Jianying PAN Shenggang TANG xiangru State Key Laboratory for Conservation and Utilization of Subtropical Agricultural Bioresources South China Agricultural UniversityGuangzhou 510642China Scientific Observing and Experimental Station of Crop Cultivation in South China Ministry of Agriculture and Rural AffairGuangzhou 510642China Guangzhou Key Laboratory for Science and Technology of Aromatic Rice Guangzhou 510642China

Applying iodine fertilizers to cultivate iodine-rich crops for daily intake is an effective approach for iodine supplementation,especially for aromatic *** experiments were conducted during the early growing seasons of 2021 and 2022 to evaluate the impacts of foliar application of iodine fertilizer on aromatic rice and to explore the optimal iodine fertilizer *** the full heading stage,six different concentrations of sodium iodide solutions of 0%(CK),0.010%(T1),0.025%(T2),0.050%(T3),0.075%(T4),and 0.100%(T5)were applied to indica aromatic rice cultivars Meixiangzhan 2 and *** results showed that sodium iodide treatments significantly increased the iodine and sodium contents in both leaves and *** with the CK,the T1 and T2 treatments increased the 2-acetyl-1-pyrroline(2-AP)content in mature grains by 8.41%-101.66%and 13.58%-74.60%,*** in the contents of 1-pyrroline-5-carboxylic acid,proline,1-pyrroline,and methylglyoxal,as well as the activity of proline dehydrogenase were also ***,sodium iodide treatments remarkably decreased the chalky grain rate,chalkiness area,and chalkiness degree of aromatic rice,with the T2 treatment exhibiting a 17.79%-47.42%decrease in chalkiness degree compared with the ***,T1 and T2 treatments showed beneficial impacts on chlorophyll content,photosynthetic characteristics,and yield components,while T3,T4,and T5 treatments exhibited adverse effects on leaf and grain *** linear discriminant analysis revealed significant differences between *** correlation analysis and piecewise structural equation modeling showed that the iodine and sodium influenced the photosynthetic characteristics and chlorophyll content of the leaves,thereby regulating the 2-AP biosynthesis and yield components,ultimately affecting the 2-AP content and ***,this study suggests that foliar application of 0.025%sodium iodide is an effective method t

关键词： 2-acetyl-1-pyrroline appearance quality aromatic rice foliar application grain yield iodine

Regulation of 2-acetyl-1-pyrroline and grain quality in early-season indica fragrant rice by nitrogen and silicon fertilization under different plantation methods

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Journal of Integrative Agriculture 2024年第2期23卷 511-535页

作者： Yongjian chen Lan Dai Siren cheng Yong Ren Huizi Deng Xinyi Wang Yuzhan Li xiangru Tang Zaiman Wang Zhaowen Mo State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of AgricultureSouth China Agricultural UniversityGuangzhou 510642China Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology Yulin Normal UniversityYulin 537000China Key Laboratory for Conservation and Utilization of Subtropical Bio-Resources Education Department of Guangxi Zhuang Autonomous Region/College of Biology and PharmacyYulin Normal UniversityYulin 537000China Scientific Observing and Experimental Station of Crop Cultivation in South China Ministry of Agriculture and Rural AffairsGuangzhou 510642China Guangzhou Key Laboratory for Science and Technology of Fragrant Rice Guangzhou 510642China Key Laboratory of Key Technology for South Agricultural Machine and Equipment Ministry of Education/College of EngineeringSouth China Agricultural UniversityGuangzhou 510642China

Fragrant rice has a high market value,and it is a popular rice type among consumers owing to its pleasant *** methods,nitrogen(N)fertilizers,and silicon(Si)fertilizers can affect the grain yield and fragrance of fragrant ***,the core commercial rice production attributes,namely the head rice yield(HRY)and 2-acetyl-1-pyrroline(2-AP)content of fragrant rice,under various nitrogen and silicon(N-Si)fertilization levels and different plantation methods remain *** field experiment in this study was performed in the early seasons of 2018 and 2019 with two popular indica fragrant rice cultivars(Yuxiangyouzhan and Xiangyaxiangzhan).They were grown under six N-Si fertilization treatments(combinations of two levels of Si fertilizer,0 kg Si ha^(−1)(Si0)and 150 kg Si ha^(−1)(Si1),and three levels of N fertilizer,0 kg N ha^(−1)(N0),150 kg N ha^(−1)(N1),and 220 kg N ha^(−1)(N2))and three plantation methods(artificial transplanting(AT),mechanical transplanting(MT),and mechanical direct-seeding(MD)).The results showed that the N-Si fertilization treatments and all the plantation methods significantly affected the HRY and 2-AP content and related parameters of the two different fragrant rice *** with the Si0N0 treatment,the N-Si fertilization treatments resulted in higher HRY and 2-AP *** rates of brown rice,milled rice,head rice,and chalky rice of the fragrant rice also improved with the N-Si fertilization *** N-Si fertilization treatments increased the activities of N metabolism enzymes and the accumulation of N and Si in various parts of the fragrant rice,and affected their antioxidant response *** key parameters for the HRY and 2-AP content were assessed by redundancy ***,the structural equation model revealed that the Si and N accumulation levels indirectly affected the HRY by affecting the N metabolism enzyme activity,N use efficiency,and grain quality of fragrant ***,high N

关键词： fragrant rice 2-AP content head rice yield mechanical planting nitrogen silicon

水体化学需氧量(CODMn)的测定方法综述

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皮革制作与环保科技 2020年第5期1卷 73-75页

作者：陈相如江苏省徐州环境监测中心 221000

在检测水质时为了测定水体中含有的有机化合物含量,需要对需氧量(CODMn)进行检测,从而间接的表达出有机化合物的含量,它是检测水质的指标之一。水质问题已经收到了全球范围的关注,影响着居民健康状况。在工业化发展进程当中,尤其是皮革... 详细信息

在检测水质时为了测定水体中含有的有机化合物含量,需要对需氧量(CODMn)进行检测,从而间接的表达出有机化合物的含量,它是检测水质的指标之一。水质问题已经收到了全球范围的关注,影响着居民健康状况。在工业化发展进程当中,尤其是皮革制作过程中产生的废水使我国的水质受到了污染,废水、染料以及药物等有机物的含量超标,对水质的检测变为重中之重。为此文章分析了对水体中化学需氧量的各种测定方法,从国内外的角度来阐述,对滴定法和光谱法中各项分析方法的测定原理、具体的操作、方法特点等进行了阐述,从而为水质检测提供理论依据。

关键词：化学需氧量水质检测测量方法