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Numerical study of thermal characteristics of double skin facade system with middle shade

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Frontiers in Energy 2021年第1期15卷 222-234页

作者： Shaoning LIU Xiangfei KONG Hua YANG minchao FAN Xin ZHAN School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300401China

Architectural shade is an effective method for improving building energy efficiency.A new shade combined with the double skin façade(DSF)system,called middle shade(MS),was introduced and developed for *** this paper,a 3D dynamic simulation was conducted to analyze the influence of MS combined with DSF on the indoor thermal *** research on MS for DSF involves the temperature,the ventilation rate,the velocity distribution of the air flow duct,and the indoor *** results show that the angle and position of the shade in the three seasons are different,and different conditions effectively enhance the indoor thermal *** summer,the appearance of MS in DSF makes the indoor temperature significantly *** indoor temperature is obviously lower than that of the air flow duct,and the temperature of the air flow duct is less affected by *** influence of the position of blinds on indoor temperature and ventilation rate is greater than the influence of the angle of *** to the climate characteristics of winter and transition season,in winter,early spring,and late autumn,the indoor temperature decreases with the increase of the position of blinds at daytime,but the opposite is true at *** results found in this paper can provide reference for the design and use of MS combined with DSF in hot summer and cold winter zone.

关键词： middle shade position thermal characteristics double skin facade

Variation of the friction conditions in cold ring compression tests of medium carbon steel

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Friction 2020年第2期8卷 311-322页

作者： Dawei ZHANG Bingkun LIU Jingxiang LI minchao CUI Shengdun ZHAO School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049China Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Lubrication and friction conditions vary with deformation during metal forming *** macro-variations can be observed when a threshold of deformation is *** study shows that during the cold compression processing of#45(AISI 1045)steel rings,the magnitude of friction and surface roughness(Ra)changes significantly upon reaching a 45%reduction in ring *** example,the Ra of compressed ring specimens increased by approximately 55%immediately before and after reaching this threshold,compared to an 18% or 25%variation over a 35%-45%or a 45%-55%reduction in height,*** ring compression test conducted by this study indicates that the Coulomb friction coefficient and Tresca friction factor mare 0.105 and 0.22,respectively,when the reduction in height is less than 45%;and 0.11 and 0.24,respectively,when the reduction in height is greater than 45%.

关键词： friction condition ring compression test friction calibration curve surface topography

Synthesis of poly(3,4-propylenedioxythiophene)/MnO2 composites and their applications in the adsorptive removal of methylene blue

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Progress in Natural Science:Materials International 2016年第1期26卷 32-40页

作者： Ruxangul Jamal Li Zhang minchao Wang Qin Zhao Tursun Abdiryim Key Laboratory of Petroleum and Gas Fine Chemicals Educational Ministry of China College of Chemistry and Chemical Engineering Xinjiang University Key Laboratory of Functional Polymers Xinjiang University

The poly(3,4-propylenedioxythiophene)/Mn Ocomposites(PPro DOT/Mn O) were prepared successfully by soaking the PPro DOT powders into potassium permanganate(KMn O) solution, with the mass ratio of PPro DOT and KMn Ofrom 2:1 to 1:2. The structure and morphology of composites were characterized by Fourier transform infrared spectroscopy(FTIR), Raman spectroscopy, ultraviolet–visible absorption spectra(UV), X-ray diffraction(XRD), energy-dispersive X-ray spectroscopy(EDX) and field emission scanning electron microscope(FE-SEM).Furthermore, PPro DOT/Mn Ocomposites were tested as the adsorbents for removal of methylene blue(MB) from aqueous solution. The results revealed that the composites were successfully synthesized, and the thiophene sulfur was oxidized into sulfoxide by KMn O. The highest percentage removal of MB after 30 min was 91% for PPro DOT/Mn O(1:2) composite, and the percentage removal of MB was 12 mg g(~-1)after 60 min at initial concentrations of MB dye of 5.6 mg Lin the case of PPro DOT/Mn O(1:2) composite. Besides, the adsorption process of PPro DOT/Mn O(1:2) composite was described by pseudo-second-order and Langmuir models.

关键词： Poly(3,4-propylenedioxythiophene) MnO2 Composite Adsorptive removal Methylene blue

Machinability ofγ-TiAl:A review

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Chinese Journal of Aeronautics 2023年第7期36卷 40-75页

作者： Ziwen XIA Chenwei SHAN Menghua ZHANG minchao CUI Ming LUO Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Cemented Carbide Zhuzhou 412000China

Owing to its outstanding mechanical properties,γ-TiAl is desirable materials for crossgeneration *** 70 years of exploration have made it into the initial ***,the intrinsic brittleness ofγ-TiAl is still a critical obstacle to its large-scale *** this context,researchers have made many attempts to study the machinability ofγ-*** present,existing relevant reviews have mostly discussed the processing methods ofγ-***,there is still a lack of a perspective on material properties to analyze the cutting ***,this paper provides the systematic review of such *** all,the developmental process,phase transformation,and microstructural evolution ofγ-TiAl are discussed,as well as its deformation mechanism at *** topics can provide a materials science foundation for the machining ofγ-*** then,the review focuses on the cutting mechanism and surface integrity ofγ-***,special attention is paid to the microscope deformation mechanism and surface defects evolution ofγ-TiAl during ***,the review indicates that the highperformance machining technology ofγ-TiAl faces challenges and proposes potential future research *** the difficulties during machiningγ-TiAl aero-engine components will accelerate the development of new aero-engines.

关键词： Cutting mechanism Deformation Machinability Surface integrity γ-TiAl

中医药干预Nrf2/HO-1信号通路治疗急性胰腺炎的研究进展

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中国实验方剂学杂志 2024年第5期30卷 265-271页

作者：辛宛铃王宁梁岑怡祖悦李偲嘉冯敏超陈国忠广西中医药大学南宁530001 广西中医药大学第一附属医院南宁530023

急性胰腺炎(AP)是临床常见的急腹症,具有起病急、发展快、病情重、并发症多、致死率高等特点。早期阶段如果治疗不及时可向重症急性胰腺炎(SAP)发展。AP发病机制繁杂,涉及多个细胞分子层面。目前已经明确氧化应激和活性氧(ROS)的生成参... 详细信息

急性胰腺炎(AP)是临床常见的急腹症,具有起病急、发展快、病情重、并发症多、致死率高等特点。早期阶段如果治疗不及时可向重症急性胰腺炎(SAP)发展。AP发病机制繁杂,涉及多个细胞分子层面。目前已经明确氧化应激和活性氧(ROS)的生成参与了AP的生理病理过程,这与胰腺细胞内的抗氧化酶数量少及活性低有关。核转录因子E2相关因子2(Nrf2)是维持组织细胞内氧化还原平衡的“金钥匙”,通过与下游血红素加氧酶-1(HO-1)等抗氧化酶协作,构成了体内对抗氧化反应和炎症的重要信号通路。中药因其多成分、多靶点、多给药方式、多方剂等特点在治疗疾病方面有着独特疗效。基于中西医协同理念,目前中药在治疗AP方面也逐渐成为新热潮。AP胰腺组织中氧化应激水平与Nrf2/HO-1信号通路处于一个动态变化的过程,通过中医药干预可以有效清除ROS,影响炎症途径,减少氧化应激损伤,从而起到保护胰腺的作用,提示该通路在AP中有着重要作用。该文就近年来关于中医药调控Nrf2/HO-1信号通路治疗AP的相关文献进行梳理阐述,总结出以该通路为靶点的中药单体主要以清热解毒类、活血化瘀类、益气温中类为主,中药复方包括茵陈蒿汤、清胰Ⅱ号等,以期为AP疾病的防治及进一步的药物开发提供新方向。

关键词：急性胰腺炎氧化应激核转录因子E_(2)相关因子2/下游血红素加氧酶-1(Nrf2/HO-1)信号通路中医药研究进展

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混合小型化波导热疗天线设计

微波学报 2024年第1期40卷 28-33,43页

作者：王婷杜永兴李敏超李晨璐李宝山内蒙古科技大学信息工程学院包头014010

热疗天线由于体积较大,辐射的微波能量范围也较大,天线设计使用较为复杂,不适用于治疗体积较小的肿瘤。针对这一问题设计了一种小型化波导热疗天线来治疗小体积肿瘤,考虑到透热深度与天线体积的兼顾,选用了915 MHz的中心频率,使用混合... 详细信息

热疗天线由于体积较大,辐射的微波能量范围也较大,天线设计使用较为复杂,不适用于治疗体积较小的肿瘤。针对这一问题设计了一种小型化波导热疗天线来治疗小体积肿瘤,考虑到透热深度与天线体积的兼顾,选用了915 MHz的中心频率,使用混合小型化技术将天线小型化,即通过对天线加脊的同时加入短路探针将天线半径缩小到了19 mm,其高为36 mm。比吸收率仿真时馈入1 W的能量最高点能够达到45 W/kg,温度场仿真时馈入20 W能量加热30分钟后最热的区域温度可达45℃,体模实验结果与仿真实验相吻合,这些实验结果均表明其能够达到治疗乳房内部肿瘤的效果。

关键词：微波热疗小型化波导天线体模热疗

Seed Selection for Data Offloading Based on Social and Interest Graphs

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Computers, Materials & Continua 2018年第12期57卷 571-587页

作者： Ying Li Jianbo Li Jianwei Chen minchao Lu Caoyuan Li College of Computer Science and Technology Qingdao UniversityQingdao266071China School of Computer Beijing Institute of TechnologyBeijing100081China Faculty of Engineering and Information Technology University of Technology SydneyNSW 2006Australia

The explosive growth of mobile data demand is becoming an increasing burden on current cellular *** address this issue,we propose a solution of opportunistic data offloading for alleviating overloaded cellular *** principle behind it is to select a few important users as seeds for data *** three critical steps are detailed as *** first explore individual interests of users by the construction of user profiles,on which an interest graph is built by Gaussian graphical *** then apply the extreme value theory to threshold the encounter duration of user ***,a contact graph is generated to indicate the social relationships of ***,a contact-interest graph is developed on the basis of the social ties and individual interests of *** on different graphs,three strategies are finally proposed for seed selection in an aim to maximize overloaded cellular *** evaluate the performance of our algorithms by the trace data of real-word *** demonstrates the effectiveness of the strategy of taking social relationships and individual interests into account.

关键词： Mobile social network social data offloading extreme value model Gaussian graphical model

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氮沉降对森林土壤碳矿化影响的生物学机制

世界林业研究 2024年第3期37卷 16-21页

作者：王明柳陆梅黄敏超孙煜佳郭础鸟刘国庆西南林业大学生态与环境学院昆明650024

大气氮沉降及CO_(2)浓度剧增所导致的全球变化已经成为当今世界面临的严峻生态环境问题。土壤碳矿化作为森林生态系统碳循环的关键过程,不仅影响森林土壤碳的固定与转变,而且通过CO_(2)释放影响全球气候变暖。探明大气氮沉降对土壤碳矿... 详细信息

大气氮沉降及CO_(2)浓度剧增所导致的全球变化已经成为当今世界面临的严峻生态环境问题。土壤碳矿化作为森林生态系统碳循环的关键过程,不仅影响森林土壤碳的固定与转变,而且通过CO_(2)释放影响全球气候变暖。探明大气氮沉降对土壤碳矿化影响的生物学机制,有助于丰富人们对森林土壤碳源—汇平衡过程的科学认识,在全球变化研究中具有极其重要的意义。文中基于森林“植物—微生物—土壤动物”交互作用的生态学过程,阐明了大气氮沉降增加背景下森林植物(凋落物、根系及其分泌物)、土壤微生物(生物量、群落结构、多样性、养分代谢竞争)、土壤酶(种类、数量、活性)、土壤动物(蚯蚓、蚂蚁、线虫、螨类、跳虫)等生物因素变化对土壤碳矿化的影响过程及机制,以期为准确预测大气氮沉降对全球气候变化的影响提供关键理论支撑。

关键词：氮沉降碳矿化生物学机制植物根系土壤酶活性土壤微生物土壤动物

颅内动脉瘤栓塞术后能谱CTA联合MAR的临床研究

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CT理论与应用研究（中英文） 2024年第2期33卷 182-188页

作者：颜钦文王宇翔张俊贺兰胡岗熊敏超秦君翔袁学刚鄂州市中心医院医学影像科湖北鄂州436000 鄂州市中心医院神经外科湖北鄂州436000

目的:评价颅内动脉瘤栓塞术后能谱CTA联合去金属伪影技术(MAR)的应用价值。方法:收集37例颅内动脉瘤栓塞术后需行能谱头颈CTA检查患者的CT原始数据,分别重建出70~140 keV单能级图像、120 kVp-like混合能量图像及70~140 keV MAR处理图像... 详细信息

目的:评价颅内动脉瘤栓塞术后能谱CTA联合去金属伪影技术(MAR)的应用价值。方法:收集37例颅内动脉瘤栓塞术后需行能谱头颈CTA检查患者的CT原始数据,分别重建出70~140 keV单能级图像、120 kVp-like混合能量图像及70~140 keV MAR处理图像和120kVp-like MAR图像;感兴趣区(ROI)放置在伪影最严重层面的线圈附近,测量CT值及标准差(SD),计算伪影指数(AI)及信噪比(SNR);在主观分析方面,由两名诊断医生采用Likert 5分量表法对所有图像的伪影程度和血管显示能力进行评估;比较MAR组和非MAR组图像的主观评分和客观参数。采用Wilcoxon秩和检验、配对样本t检验及独立样本t检验比较各组图像之间的差异。结果:8组单能量图像上,MAR图像的AI明显低于非MAR图像;在80~110 keV条件下,MAR图像SNR高于非MAR组,差异具有统计学意义;相同keV下,与非MAR组相比,MAR组图像的伪影评分及周围血管显示主观评分得分均更高。对于非MAR处理图像,AI值与周围血管显示评分在植入不同直径弹簧圈的患者图像上没有统计学差;对于MAR图像,较大直径弹簧圈组(>8.79 mm)患者图像的AI值明显高于常规直径组,而周围血管显示主观评分明显低于常规直径组。结论:能谱CTA成像联合MAR可有效减少颅内动脉瘤栓塞植入物伪影,改善周围血管显示,对于小直径的弹簧圈MAR减少伪影效果最为显著。

关键词：体层摄影术 X线计算机能谱成像颅内动脉瘤栓塞术金属伪影

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