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压水堆核电站堆芯物理热工水力耦合特性研究

信息与电脑 2024年第9期36卷 4-6页

作者：姚亦珺中国核电工程有限公司北京100142

随着信息技术高速发展,人工智能、大数据以及物联网等多种技术在核电站中应用日益广泛。其中反应堆的物理热工耦合特性是其整体性能的重要体现,也是评估其经济性、安全的主要依据。基于此,本文主要计算单根燃料棒模型耦合以及3*3组件模... 详细信息

随着信息技术高速发展,人工智能、大数据以及物联网等多种技术在核电站中应用日益广泛。其中反应堆的物理热工耦合特性是其整体性能的重要体现,也是评估其经济性、安全的主要依据。基于此,本文主要计算单根燃料棒模型耦合以及3*3组件模型耦合,了解其在不同工况中的变化,有利于事故预测以及方案优化。

关键词：压水堆核电站堆芯物理热工水力耦合特性信息技术

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压水堆核电厂大修换料时间优化研究

核安全 2024年第4期23卷 110-119页

作者：姚亦珺于大鹏皮月中国核电工程有限公司北京100840 生态环境部核与辐射安全中心北京100082 中核能源科技有限公司北京100193

核电厂能力因子是国际公认的核电厂运营效率衡量指标,其定义为一个固定时期内(通常为一年),发电机组的可用发电量与额定发电量的比值,即核电机组能力因子等于机组额定发电量减去电量损失之差除以机组额定发电量。其中,换料大修工期是影... 详细信息

核电厂能力因子是国际公认的核电厂运营效率衡量指标,其定义为一个固定时期内(通常为一年),发电机组的可用发电量与额定发电量的比值,即核电机组能力因子等于机组额定发电量减去电量损失之差除以机组额定发电量。其中,换料大修工期是影响电量损失的重要因素。根据国际原子能机构(IAEA)的数据,最近10年世界各类型核电机组的能力因子几乎都在85%左右。核电厂发电创造的社会价值及经济价值的多少与其能力因子直接相关,而能力因子与一年的净发电量成正比,因此,提高能力因子就需要提高净发电量。随着核电厂运行技术水平的提高,正常运行期间,除了一些必要的核安全相关的试验需要损失功率外,核电机组几乎很少发生异常功率损失。然而,根据核电机组自身核燃料设计的特点以及核安全相关设备的可靠性要求,核电机组不得不定期进行大修。因此,大修工期长短造成的计划能量损失的多少就成为影响机组能力因子最主要的因素。本文从大修工期中较为耗时的方面着手,在系统工艺设计优化的角度缩短大修工期时间,从而减少机组能量损失。

关键词：能力因子换料大修能量损失大修工期

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基于模糊数学感官评价法优化杂粮代餐粉配方

食品研究与开发 2024年第4期45卷 103-109,117页

作者：周玉蓉姚轶俊王博王立峰哈尔滨商业大学食品工程学院黑龙江哈尔滨150028 南京财经大学食品科学与工程学院江苏南京210023

为优化杂粮代餐粉配方及制作工艺,采用模糊数学感官评价法进行感官评价。以青稞超微粉与荞麦超微粉作为杂粮代餐粉的原料,根据冲调糊化度确定杂粮超微粉的熟化条件,对不同主、辅料配比的杂粮代餐粉进行模糊数学感官评价,研究不同稳定剂... 详细信息

为优化杂粮代餐粉配方及制作工艺,采用模糊数学感官评价法进行感官评价。以青稞超微粉与荞麦超微粉作为杂粮代餐粉的原料,根据冲调糊化度确定杂粮超微粉的熟化条件,对不同主、辅料配比的杂粮代餐粉进行模糊数学感官评价,研究不同稳定剂对杂粮代餐粉冲调稳定性的影响并对最终杂粮代餐粉的营养成分进行测定。结果表明:青稞超微粉与荞麦超微粉的熟化条件为焙烤温度160℃、焙烤时间12 min;杂粮代餐粉配方的主料为青稞超微粉与荞麦超微粉,质量比为40∶60,辅料为6%的白砂糖、8%的脱脂奶粉,稳定剂为黄原胶,添加量为0.5%。最终杂粮代餐粉的蛋白质含量为(12.15±0.13)%、淀粉含量为(67.33±1.18)%、粗脂肪含量为(2.03±0.07)%、总膳食纤维含量为(7.26±0.15)%。

关键词：模糊数学超微粉碎杂粮代餐粉配方优化

Effect of cooked rice with added fructo-oligosaccharide on faecal microorganisms investigated by in vitro digestion and fermentation

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Food Science and Human Wellness 2023年第2期12卷 662-668页

作者： Fei Pei Wen Li Xiaolei Ni Xinyang Sun yijun yao Yong Fang Wenjian Yang Qiuhui Hu College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and Processing Nanjing University of Finance and EconomicsNanjing 210023China Department of Food and Human Nutritionl Sciences University of ManitobaWinnipeg MB R3T 2N2Canada

In the present study,the effects of cooked rice(CR)with added fructo-oligosaccharide(FOS)on faecal flora were studied by a simulated in vitro digestion and fermentation *** total carbohydrate content,p H,and s hort-chain fatty acids(SCFAs)were determined during in vitro digestion and *** change in the bacterial phase distribution after the fermentation was also *** results showed that t he total carbohydrate content of the CR with added FOS(FCR)significantly decreased during the simulated ***,the p H of the FCR decreased and the SCFAs concentration increased significantly compared to those of the CR during the simulated *** addition,the FCR showed the advantage of promoting beneficial bacteria,such as Bifidobacterium and Lactobacillus,and inhibiting harmful bacteria,such as Bacteroides and Klebsiella compared to the ***,the FOS as a prebiotic could be recommended to produce the high-quality healthy rice food.

关键词： Fructo-oligosaccharide In vitro Fermentation Rice Short-chain fatty acids Bacterial phase distribution

Rankin-Cohen Deformations and Representation Theory

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Chinese Annals of Mathematics,Series B 2014年第5期35卷 817-840页

作者： yijun yao School of Mathematical Sciences Fudan University

The author uses the unitary representation theory of SL2(R) to understand the Rankin-Cohen brackets for modular forms. Then this interpretation is used to study the corresponding deformation problems that Paula Cohen,... 详细信息

关键词：变形问题科恩表示论表示理论模块化

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荧光醋酸纤维素纤维的制备及性能分析

棉纺织技术 2024年第2期52卷 36-42页

作者：薛囝囡尹伊秋郝可鑫乔锦玉姚一军西安工程大学陕西西安710048 陕西纺织器材研究所有限责任公司陕西咸阳712000

为了制备高荧光强度和稳定性的荧光醋酸纤维素纤维,以N,N-二甲基甲酰胺为溶剂,醋酸纤维素为原料,铕、镝掺杂的碱土铝酸锶为荧光粒子,去离子水为凝固浴,通过湿法纺丝制备了荧光醋酸纤维素纤维。采用透反射金相显微镜、电子单纤维强力机... 详细信息

为了制备高荧光强度和稳定性的荧光醋酸纤维素纤维,以N,N-二甲基甲酰胺为溶剂,醋酸纤维素为原料,铕、镝掺杂的碱土铝酸锶为荧光粒子,去离子水为凝固浴,通过湿法纺丝制备了荧光醋酸纤维素纤维。采用透反射金相显微镜、电子单纤维强力机、扫描电镜和荧光光谱仪对不同质量分数纺丝液、不同质量分数荧光粒子和凝固浴温度下制备的纤维表面形貌、机械性能、荧光粒子分布和荧光性能进行表征。结果表明:当纺丝液质量分数为20%、荧光粒子质量分数为3%,凝固浴温度为25℃时,通过湿法纺丝制得的荧光纤维断裂强度为4.2 cN/dtex、断裂伸长率可达380%、荧光强度为4.8×105。

关键词：醋酸纤维素荧光粒子表面结构机械性能荧光性能

Effects of rare earth oxide additives on the thermal behaviors of aluminum nitride ceramics

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Rare Metals 2009年第6期28卷 596-599页

作者： yao yijun WANG Ling LI Chuncheng JIANG Xiaolong QIU Tai School of Mathematics and Physics Nanjing University of Information and Science Technology Nanjing 210044 China College of Materials Science and Engineering Nanjing University of Technology Nanjing 210009 China

The effects of Y2O3 and Er2O3 on the sintering behaviors, thermal properties and microstructure of A1N ceramics were investigated. The experimental results show that the sintering temperature can be decreased; the relative density and thermal behavior can be improved by adding rare earth oxide in A1N ceramics. For A1N ceramics with 3 wt.% Er2O3 additive, the relative density is 98.8%, and the thermal conductivity reaches 106 W.m^-1.K^-1. The microstructure research found that no obvious aluminum erbium oxide was found in A1N ceramics doped with 3 wt.% Er203, which favored the improvement of the thermal conductivity of A1N ceramics.

关键词： alumina nitride rare earth oxide thermal behavior sintering

Fully endoscopic far-lateral supracerebellar infratentorial approach for trigeminal neuralgia: illustrative case reports

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中华神经外科杂志(英文) 2024年第2期10卷 1-5页

作者： yao Hong Yang Wenlei Tang Hao Cheng yijun Lin Shaojian Wu Zhe Bao Department of Neurosurgery Center of Pituitary Tumor Ruijin Hospital Shanghai Jiao Tong University School of Medicine# Ruijin Er Road Shanghai China

Background Trigeminal neuralgia (TN) is a common cause of craniofacial pain. The retrosigmoid approach is usually used to treat TN, but no cases of endoscopic far-lateral supracerebellar infratentorial approach (EF-SCITA) were used to undergo operation for *** presentation Two patients were presented with severe facial pain and preliminary diagnosis was TN. Preoperative magnetic resonance imaging revealed that a superior cerebellar artery (SCA) compressed the trigeminal nerve in case 1, and a tumor located in the petrous apex extending into the Meckel’s cave compressed the trigeminal nerve in case 2. Operations were achieved through the EF-SCITA. The pain was totally relieved with no postsurgical complications in both *** We present the first two case reports of EF-SCITA to relieve classical and secondary TN successfully. The EF-SCITA can be a promising approach for treating TN.

关键词： Approach Endoscopic surgery Trigeminal neuralgia

The developing condition analysis of semiconductor laser frequency stabilization technology

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Journal of Semiconductors 2018年第11期39卷 40-46页

作者： yijun yao Canwen Zou Haiyang Yu Jinjin Guo Yaming Li Jianguo Liu State Key Laboratory on Integrated Optoelectronics Institution of Semiconductors Chinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Key Laboratory of Aerospace Information Applications CETC College of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences

The frequency stability of free-running semiconductor lasers is influenced by several factors, such as driving current and external operating environment. The frequency stabilization of laser has become an international research hotspot in recent years. This paper reviews active frequency stabilization technologies of laser diodes and elaborates their principles. Based on differences of frequency discrimination curves, these active frequency stabilization technologies are classified into three major types, which are harmonic frequency stabilization,Pound-Drever-Hall(PDH) technology and curve subtraction frequency stabilization. Further, merits and demerits of each technology are compared from aspects of frequency stability and structure complexity. Finally, prospects of frequency stabilization technologies of semiconductor lasers are discussed in detail. Combining several of these methods are future trends, especially the combination of frequency stabilization of F–P cavity. And PID electronic control for optimizing the servo system is generally added in the methods mentioned above.

关键词： semiconductor laser frequency stabilization active frequency stabilization frequency discriminator