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Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method

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Journal of Thermal Science 2022年第4期31卷 1023-1036页

作者： ZHANG Hu wu kefan TANG Guihua State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong Universityxi'an 710049china MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi'an Jiaotong Universityxi'an 710049china

The hot strip method,as one typical transient method,is widely used to measure the effective thermal conductivity of thermal insulation materials at various *** the test theory is based on solving the energy equation via heat conduction,the test result will be questionable when measuring thermal insulation materials,such as silica aerogel and photovoltaic glazing,in which the participating thermal radiation is a dominant heat transfer mode at high *** this study,numerical investigation is employed to reveal the measurement reliability of hot strip method when applied to translucent thermal insulation *** reproducing the dynamic conduction-radiation coupled heat transfer process within the translucent materials numerically,the effective thermal conductivity of translucent materials with varying extinction coefficients are obtained at various *** are made for the effective thermal conductivity of translucent materials determined by the hot strip method,one-dimensional steady state method,transient plane source method and Rosseland *** discrepancies are found among the effective thermal conductivity determined by different methods for translucent materials with low extinction *** thermal conductivity obtained from the hot strip method is overestimated at elevated temperature when compared with that from one-dimensional steady state *** order to measure the effective thermal conductivity of translucent materials accurately,the effect of thermal radiation should be considered for different transient methods.

关键词： hot strip method thermal conductivity translucent materials thermal radiation

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社区老科协建设现状及对策研究

今日科苑 2024年第3期 52-65页

作者：李宇鹏吴可凡管颖妍北京化工大学北京100029

老科技工作者退休后大都在社区居住,管理模式由原有的单位制向社区制转变,需要顺应时代变化通过社区老科协组织建设助力老科技工作者老有所为,余热生辉。通过调查研究方法和问卷数据分析,了解老科技工作者对社区老科协建设及开展社区服... 详细信息

老科技工作者退休后大都在社区居住,管理模式由原有的单位制向社区制转变,需要顺应时代变化通过社区老科协组织建设助力老科技工作者老有所为,余热生辉。通过调查研究方法和问卷数据分析,了解老科技工作者对社区老科协建设及开展社区服务的认知、参与意愿、诉求,发现九成以上的老科技工作者有继续发挥余热的意愿以及社区老科协组织活动频次偏低,开展活动前三位为科普宣讲、文体娱乐活动和培训技术,并发现组织文体活动、老科技工作者心理调适服务和满足其继续学习的需求是当前社区老科协提供服务的着力点,社区老科协建设中也存在经费不足和场地受限等方面的问题,文章从基层党建引领机制创新、合作治理推动组织增能、“五社联动”和智慧化建设提高精细化服务水平等方面提出社区老科协助力老科技工作者发挥余热的实现路径。

关键词：社区老科协建设老科技工作者发挥余热老有所为

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长外露锚杆无损检测技术应用研究

西北水电 2024年第1期 50-54页

作者：吴克凡祁增云张大洲杨卫中国电建集团西北勘测设计研究院有限公司西安710065 中南大学地球科学与信息物理学院长沙410083

常规锚杆无损检测是依据一维杆体理论对锚杆注浆质量进行快速检测。对于长外露锚杆(长自由端),弹性波在外露端的多次反射严重影响锚杆长度与注浆密实度的判定。采用通截取法、辅助钢筋法和辅助套环法对长外露锚杆进行现场处理,对采集的... 详细信息

常规锚杆无损检测是依据一维杆体理论对锚杆注浆质量进行快速检测。对于长外露锚杆(长自由端),弹性波在外露端的多次反射严重影响锚杆长度与注浆密实度的判定。采用通截取法、辅助钢筋法和辅助套环法对长外露锚杆进行现场处理,对采集的数据进行对比分析,应用结果表明3种方法均能解决长外露锚杆无损检测难题,在某些特定条件下,辅助套环法比辅助钢筋法和截取法具有更多的优势,具有一定的推广价值。

关键词：长外露锚杆无损检测注浆质量

脑乳酸代谢及星形胶质细胞-神经元乳酸穿梭在神经元活动和神经疾病中作用的研究进展

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中华实用诊断与治疗杂志 2024年第5期38卷 533-535页

作者：陈丽丽吴科帆侯家保张元夏中元武汉大学人民医院麻醉科湖北武汉430064

乳酸是葡萄糖无氧糖酵解代谢的终产物,被认为是一种代谢废物,但在葡萄糖缺乏、能量需求增加或氧气供应减少时,大脑可将乳酸作为能量来源。作为连接神经元和星形胶质细胞代谢的中间分子,乳酸在脑功能和神经系统疾病中发挥保护作用。本文... 详细信息

乳酸是葡萄糖无氧糖酵解代谢的终产物,被认为是一种代谢废物,但在葡萄糖缺乏、能量需求增加或氧气供应减少时,大脑可将乳酸作为能量来源。作为连接神经元和星形胶质细胞代谢的中间分子,乳酸在脑功能和神经系统疾病中发挥保护作用。本文就脑乳酸代谢及星形胶质细胞-神经元乳酸穿梭在神经元活动、神经疾病中作用的研究进展作一综述。

关键词：创伤性脑损伤退行性神经疾病精神障碍乳酸星形胶质细胞-神经元乳酸穿梭星形胶质细胞

Computational fluid dynamics modeling of rapid pyrolysis of solid waste magnesium nitrate hydrate under different injection methods

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Chinese Journal of Chemical Engineering 2024年第2期66卷 224-237页

作者： Wenchang wu kefan Yu Liang Zhao Hui Dong SEP Key Laboratory of Eco-industry School of MetallurgyNortheastern UniversityShenyang 110819China Liaoning Engineering Research Center of Energy Saving and Green Low Carbon Technology for Process Industry Northeastern UniversityShenyang 110819China

This study developed a numerical model to efficiently treat solid waste magnesium nitrate hydrate through multi-step chemical *** model simulates two-phase flow,heat,and mass transfer processes in a pyrolysis furnace to improve the decomposition rate of magnesium *** performance of multi-nozzle and single-nozzle injection methods was evaluated,and the effects of primary and secondary nozzle flow ratios,velocity ratios,and secondary nozzle inclination angles on the decomposition rate were *** indicate that multi-nozzle injection has a higher conversion efficiency and decomposition rate than single-nozzle injection,with a 10.3%higher conversion rate under the design *** decomposition rate is primarily dependent on the average residence time of particles,which can be increased by decreasing flow rate and velocity ratios and increasing the inclination angle of secondary *** optimal parameters are injection flow ratio of 40%,injection velocity ratio of 0.6,and secondary nozzle inclination of 30°,corresponding to a maximum decomposition rate of 99.33%.

关键词： Multi-nozzle Computational fluid dynamics Thermal decomposition reaction Pyrolysis furnace

限饲对断奶前湖羊母羊隐性乳房炎和部分血液生化指标的影响

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安徽科技学院学报 2024年第5期38卷 1-7页

作者：孔亮林春联李诗卉吴克凡王淑娟庞训胜安徽科技学院动物科学学院安徽凤阳233100

目的:通过断奶前限饲精料,探讨母羊营养和抗氧化等指标变化。方法:选择28只健康的2胎次哺乳期湖羊母羊,随机均分为Ⅰ和Ⅱ组,每只羊哺乳期饲喂精料0.8 kg/d。Ⅰ组羊自分娩第42天开始将每只羊精料降至0.26 kg/d;Ⅱ组羊在分娩第42~45天精... 详细信息

目的:通过断奶前限饲精料,探讨母羊营养和抗氧化等指标变化。方法:选择28只健康的2胎次哺乳期湖羊母羊,随机均分为Ⅰ和Ⅱ组,每只羊哺乳期饲喂精料0.8 kg/d。Ⅰ组羊自分娩第42天开始将每只羊精料降至0.26 kg/d;Ⅱ组羊在分娩第42~45天精料降至0.12 kg/d,第46天始,精料增加至0.26 kg/d。母羊断奶时间为第45天。分娩第41天精料调整前(d1)和第43天(d3)、第45天(d5)、第47天(d7)、第49天(d9),固定每组5只羊,颈静脉采血,抗凝离心和取样,置于-20℃保存,其中d5、d9全群羊空腹采血2 mL,抗凝置于4℃保存。d5收集乳房奶样置于-20℃保存。结果:相较于Ⅱ组,Ⅰ组白细胞总数高(P>0.05),d5的奶中体细胞数低(P>0.05),d7的结合珠蛋白含量高(P0.05)。在所对应时间点,总蛋白、白蛋白、尿素氮和尿酸浓度,Ⅰ和Ⅱ组之间差异均不显著(P>0.05)。d1、d3和d52组葡萄糖、总胆固醇和甘油三酯指标均渐降低,尿素氮含量、总抗氧化能力呈增高趋势。Ⅱ组d5和d9的总抗氧化能力均低于Ⅰ组(P<0.01),Ⅱ组羊尿酸量持续增高。d92组甘油三酯量差异显著(P<0.05)。不同于Ⅰ组,Ⅱ组谷胱甘肽过氧化物酶活性递减。Ⅰ组d7和Ⅱ组d5的过氧化氢酶活性最高,其中Ⅱ组d5的酶活性高于Ⅰ组(P<0.05)。Ⅱ组d5丙二醛含量低于Ⅰ组(P<0.05)。结论:母羊在断奶前限饲精料未诱发临床乳房炎,相比过度限饲,精料降至0.26 kg/d的母羊在停止泌乳后的营养代谢能够避免高尿酸性抗氧化反应。

关键词：母羊限饲断奶抗氧化酶活性营养代谢指标

Fruit Growers' Opinions About Bird Conservation in North Part of Tarim Basin

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Journal of Northeast Agricultural University(English Edition) 2011年第4期18卷 55-59页

作者： wu kefan SHI Lei College of Animal Science Xinjiang Agricultural University Urumqi 830052 China

A total of 216 survey interviews were completed in the orchards of the Aksu Region and the outskirts of Korla City, in October, 2009. The questionnaire was structured around fruit growers＇ opinions about insect pest management, bird conservation and included brief profiles of the growers＇ social background. The results showed that pest management was a great concern to all types of orchard growers and more than half of them would like to attract more birds to their orchards. The age, income level, education level and the orchard type of the fruit growers had significant effects on their opinions about bird protection.

关键词： fruit grower bird conservation pest management

锁定加压钢板固定治疗老年股骨远端假体周围骨折的效果分析

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中华创伤骨科杂志 2024年第09期26卷 790-796页

作者：刘雅克周振宇陶然曹毅朱建炜王友华陆跃徐华徐嘉诚马洪冬沈冀宁赵丰翔吴可凡刘璠南通大学附属医院骨科南通

目的探讨锁定加压钢板(LCP)固定治疗老年股骨远端假体周围骨折(PPF)的临床效果。方法回顾性分析2012年6月至2023年5月期间南通大学附属医院骨科采用LCP固定治疗的31例老年股骨远端PPF患者资料。男4例, 女27例;年龄(80.2±6.1)岁;按PPF... 详细信息

目的探讨锁定加压钢板(LCP)固定治疗老年股骨远端假体周围骨折(PPF)的临床效果。方法回顾性分析2012年6月至2023年5月期间南通大学附属医院骨科采用LCP固定治疗的31例老年股骨远端PPF患者资料。男4例, 女27例;年龄(80.2±6.1)岁;按PPF通用分型系统(UCS)分型:人工全膝关节置换术后V.3B1型18例, V.3B2型6例;髋关节置换术后Ⅳ.3C型7例。内固定方式:股骨外侧单钢板固定25例, 内外侧双钢板固定6例。记录患者的手术时间、术中出血量、住院时间、术后下地负重时间、骨折愈合时间、膝关节功能及随访期间并发症发生情况等。结果 25例单钢板固定患者的手术时间为(58.7±7.9)min, 术中出血量为(78.0±15.1)mL, 住院时间为(6.9±1.6)d, 术后下地负重时间为(5.9±1.4)d, 随访时间为37(15, 51)个月;6例双钢板固定患者分别为(186.6±9.8)min、(1 256.7±231.2)mL、(17.8±3.3)d、(3.6±0.6)d、17(16, 21)个月。单钢板和双钢板固定患者的骨折愈合时间分别为(14.9±2.0)、(18.7±2.6)周。末次随访时根据美国特种外科医院评分标准评定膝关节功能:25例单钢板固定患者中, 优10例, 良15例;6例双钢板固定患者均为良。随访期间无一例患者发生切口感染、骨折不愈合及内固定失效等并发症。结论 LCP固定治疗老年股骨远端PPF可获得满意疗效。股骨外侧单钢板固定适用于大部分老年股骨远端PPF患者, 可作为首选。双钢板固定可提供更坚强的稳定性, 但应严格掌握其适应证。

关键词：股骨骨折骨折固定术, 内骨板关节成形术,置换锁定加压钢板

An aqueous rechargeable Fe//LiMn_(2)O_()hybrid battery with superior electrochemical performance beyond mainstream Fe-based batteries

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Nano Research 2024年第6期17卷 5168-5178页

作者： Yu Liu Dehui Xie Yuxin Shi Rongguan Lv Yingna Chang Yuzhen Sun Zhiyuan Zhao Jindi Wang kefan Song Huayu wu Tuan K.A.Hoang Rong Xing Huan Pang Institute of New Energy on Chemical Storage and Power Sources School of Chemical and Environmental EngineeringYancheng Teachers UniversityYancheng 224000China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Department of Chemical Engineering University of Waterloo200 University Avenue WestWaterlooOntario N2L 3G1Canada

Aqueous rechargeable batteries(ARBs)are generally safer than non-aqueous analogues,they are also less-expensive,and more friendly to the ***,the inherent disadvantage of the narrow electrochemical window of H2O seriously restricts the energy density and output voltage of ARBs,especially aqueous rechargeable Fe-based ***,we introduce a new battery system:the anode contains C@Fe/Fe_(2)O_(3)composite,which is interfaced with an alkaline electrolyte;the cathode contains LiMn_(2)O_()in contact with a neutral electrolyte.A Li^(+)-conducting membrane is carefully selected to decouple the electrode-electrolyte,which effectively widens the electrochemical window to above 2.65 V,thereby enables an aqueous rechargeable iron *** average output voltage is 1.83 V and its energy density is 235.3 Wh/kg at 549 W/*** this work,we propose the energy storage mechanism with the aid of density functional theory(DFT).The calculated reduction potential of the anode agrees with the experimental ***,this battery system demonstrates long cycle lifespan of approximately 2500 cycles at 2 A/g,corresponding to a capacity retention of 82.1%.These results are very far superior than those of mainstream aqueous rechargeable Fe-based batteries,which guarantee future investigation for storing electricity energy.

关键词： aqueous battery high voltage high energy iron oxide theoretical calculation