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Tradeoff between heating energy demand in winter and indoor overheating risk in summer constrained by building standards

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Building Simulation 2021年第4期14卷 987-1003页

作者： Ran Wang Shilei Lu Wei Feng bowen xu School of Environment Science and Engineering Tianjin University92 Weijin RoadTianjin300072China Tianjin Key Laboratory of Built Environment and Energy Application Tianjin UniversityTianjin300350China Lawrence Berkeley National Laboratory BerkeleyCA94720USA

Evidence indicates that improvement of thermal performance of building envelope has the potential for aggravating the indoor overheating risk in summer. On the other hand, evolving building standards continue to strengthen the requirements for thermal performance to achieve the energy-saving target. Therefore, this study quantifies the interaction effect between building standards-oriented building design, heating energy demand in winter, and indoor overheating risk in summer. Building databases with different energy efficiency levels are generated using a randomly generated method. Uncertain variables include not only 13 design parameters but also the running state of natural ventilation and external shading. The indoor overheating risk is assessed in terms of severity and duration. Finally, a multi-objective optimization model integrating metamodels and the non-dominated sorting genetic algorithm is proposed to balance heating energy demand in winter and indoor overheating risk in summer. Results indicate that building standards tend to aggravate overheating risk in summer: the duration and severity of high-performance buildings increased by 40.6% and 24.2% than that of conventional-performance buildings. However, window ventilation could offset the adverse effect, and mitigation of duration and severity can be up to 85.2% and 62.1% for high-performance buildings. Window ventilation can weaken the conflict between heating energy demand in winter and overheating risk in summer. As heating energy demand increased from 6.1 to 67.3 kWh/m^(2), the overheating risk changes little that the duration of overheating risk decreased from 17.5% to 15.6% and severity decreased from 8.7 ℃ to 8.3 ℃.

关键词： climate change indoor overheating risk energy codes building design natural ventilation

参苓白术散加减对腹泻型肠易激综合征脾虚湿盛证患者血清胃肠激素水平的影响

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检验医学与临床 2024年第4期21卷 530-532,537页

作者：徐博文徐海丰程晨乐平市中医医院脾胃科江西景德镇333300 乐平市中医医院心病科江西景德镇333300

目的探讨腹泻型肠易激综合征(IBS-D)脾虚湿盛证患者应用参苓白术散加减治疗的效果。方法选取2020年10月至2022年10月该院收治的78例IBS-D脾虚湿盛证患者为研究对象,按照随机数字表法分为观察组与对照组,各39例。对照组采用匹维溴铵治疗... 详细信息

目的探讨腹泻型肠易激综合征(IBS-D)脾虚湿盛证患者应用参苓白术散加减治疗的效果。方法选取2020年10月至2022年10月该院收治的78例IBS-D脾虚湿盛证患者为研究对象,按照随机数字表法分为观察组与对照组,各39例。对照组采用匹维溴铵治疗,观察组联合参苓白术散加减治疗,均连续治疗4周。比较两组总有效率、降钙素基因相关肽(CGRP)、血管活性肠肽(VIP)、5-羟色胺(5-HT)、胆囊收缩素(CCK)水平,以及中医证候总积分、生活质量、不良反应。结果治疗前,观察组与对照组CGRP、VIP、5-HT、CCK水平,中医证候总积分,IBS生活质量量表(IBS-QOL)评分比较,差异无统计学意义(P>0.05)。治疗后,观察组总有效率(94.87%)高于对照组(79.92%),CGRP、VIP、5-HT、CCK水平及中医证候总积分均低于对照组,IBS-QOL评分高于观察组,差异均有统计学意义(P<0.05)。两组均未见明显不良反应。结论匹维溴铵治疗基础上联合参苓白术散加减治疗IBS-D脾虚湿盛证患者效果确切,且具有良好的安全性,值得临床推广应用。

关键词：腹泻型肠易激综合征脾虚湿盛证参苓白术散加减胃肠激素生活质量安全性

基于气陷理论探析恶性肿瘤术后中医药治疗与康复思路

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中医杂志 2024年第11期65卷 1120-1125页

作者：孙千惠朱广辉许博文张英李杰中国中医科学院广安门医院北京市100053 北京中医药大学

“气陷”作为中医学理论中的重要概念,是对大气下陷思想内核的承袭和延伸,探析气陷理论中宗气、中气和肾气下陷概念,认为宗气下陷、中气滞陷、肾气虚陷是恶性肿瘤术后损伤核心病机。锚定扶正举陷诸法辨治以掣引升陷,其中肺金戕损,心阳... 详细信息

“气陷”作为中医学理论中的重要概念,是对大气下陷思想内核的承袭和延伸,探析气陷理论中宗气、中气和肾气下陷概念,认为宗气下陷、中气滞陷、肾气虚陷是恶性肿瘤术后损伤核心病机。锚定扶正举陷诸法辨治以掣引升陷,其中肺金戕损,心阳亏虚而宗气下陷,治以升陷汤合桂枝汤加减温补心肺,升举宗气,恢复呼吸功能;脾败枢折,肝失条达而中气滞陷,治以补中益气汤加减温补中气,升阳举陷,促进胃肠康复;源绝精亏,肝失敛藏而肾气虚陷,治以六味地黄丸合升麻柴胡汤加减,旨在滋肾敛肝,固元升提,改善盆底功能障碍。结合不同病势、病期加减配伍,为恶性肿瘤术后中医药治疗与康复提供新思路。

关键词：气陷恶性肿瘤术后康复宗气中气

基于弹性力学-热力学的变压器铁芯磁致伸缩振动模型与松动故障诊断方法

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高电压技术 2024年第5期50卷 2146-2157,I0038页

作者：曹辰路敦林徐博文李晓龙何龙朱咏明沈阳工业大学电气工程学院沈阳110870 西交利物浦大学土木工程学院苏州215123 国网新疆电力有限公司昌吉供电公司昌吉831100

为了准确分析变压器铁芯磁致伸缩现象,建立了弹性力学与热力学耦合的铁芯振动理论模型,并基于奇异性分解理论提出了松动故障诊断方法。首先通过耦合弹性力学中的应变能和热力学中的弹性自由能,建立了表征变压器铁芯多频段的磁致伸缩振... 详细信息

为了准确分析变压器铁芯磁致伸缩现象,建立了弹性力学与热力学耦合的铁芯振动理论模型,并基于奇异性分解理论提出了松动故障诊断方法。首先通过耦合弹性力学中的应变能和热力学中的弹性自由能,建立了表征变压器铁芯多频段的磁致伸缩振动数学模型;接着考虑了基于弹性力学的非线性力-磁耦合机制的影响,建立了振动多频段多物理场仿真模型,得到了铁芯0~1000 Hz的多频段振动特性;然后搭建了变压器铁芯磁致伸缩振动采集平台,对10 kV变压器铁芯进行了振动监测试验。试验结果表明,铁芯振动除100 Hz基频以外,还含有200~600 Hz的振动信号,A、B相的实测结果分别为0.009、0.023 m/s^(2),仿真结果分别为0.009、0.023 m/s^(2),仿真与试验一致,验证了仿真模型的正确性;之后建立了铁芯松动故障模型,得到部分与完全松动状态下的振动特性。最后,对获得的振动信号进行故障诊断,以铁芯正常、部分松动、完全松动的不同状态信号为基础,提出了基于奇异性分解理论的方法,计算的特征量分别为0.0524、0.2822、1.5059,说明随着松动程度的逐渐加剧,特征量逐渐增大,验证了诊断方法的准确性。

关键词：变压器铁芯磁致伸缩振动信号松动诊断

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The Novel Instance Segmentation Method Based on Multi-Level Features and Joint Attention

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Chinese Journal of Electronics 2023年第5期32卷 1160-1168页

作者： xu bowen LU Yinan WU Tieru GUO Xiaoxin College of Computer Science and Technology Jilin University College of Mathematics Jilin University

Instance segmentation is an important task in computer vision. In order to enhance the multilevel features expression ability of the segmentation networks, a novel module is proposed in this paper. Firstly,we design a weighted bi-directional feature fusion way by computing the weight distribution function of bi-directional feature pyramid network. Secondly, we propose a joint attention mechanism to effectively filter different levels of feature information by adopting serial and parallel ways to combine the channel attention and spatial attention modules. At the same time, the module uses dynamic convolution to stabilize the calculation speed while improve the 6.7% mean average precision of *** experiments on the COCO dataset demonstrate that the module can effectively improve the performance of the existing instance segmentation networks.

关键词： Computer vision Convolution Neural networks Bidirectional control Information filters Real-time systems Task analysis

综合物探方法在章丘多层煤矿采空区探测中的应用

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矿业工程研究 2024年第1期39卷 50-56页

作者：苏媛媛赵诚亮许博文山东省第一地质矿产勘查院山东济南250109

为充分发挥综合物探技术在地下采空区的探测优势,探测地下煤矿采空区的分布特征,更好地服务于城市建设及生态环境保护,选择合适的物探方法至关重要.山东章丘煤矿采空区分布复杂,断裂构造发育,且存在多层煤开采的情况,从分析已有煤矿资... 详细信息

为充分发挥综合物探技术在地下采空区的探测优势,探测地下煤矿采空区的分布特征,更好地服务于城市建设及生态环境保护,选择合适的物探方法至关重要.山东章丘煤矿采空区分布复杂,断裂构造发育,且存在多层煤开采的情况,从分析已有煤矿资料入手,总结煤层分布特征及采空区分布形态,选取高密度电阻率法和EH-4电导率成像法这2种方法对该矿采空区进行勘探,发挥浅层探测优势,选取适当参数,提高探测精度,明确精细化解释原则,推断出勘查区3煤、4煤、7煤、9煤和10煤采空区的分布范围及埋藏深度,并推测主要断裂构造的分布位置.针对物探推断解释的成果,后期进行钻探及井下电视,验证这2种方法组合勘探的效果良好,基本实现对深度30~400 m采空区异常的探测.将高密度电阻率法与EH-4电导率成像法同时运用于煤矿采空区勘查,可为同类场地条件下探测地下煤层采空区提供借鉴.

关键词：多层煤矿采空区煤层分布规律 EH-4电导率成像法高密度电阻率法

化学品船S32101点蚀性能和腐蚀性货品载运条件分析

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船舶标准化工程师 2024年第5期57卷 24-30,42页

作者：周瀚森徐博文施佳慧中国船级社上海规范研究所上海200135

考虑到节镍双相不锈钢的耐腐蚀性能与传统双相不锈钢存在差异,需要制定相应的点蚀评定标准和腐蚀性货品载运清单对其进行约束,通过腐蚀试验对节镍不锈钢S32101点蚀和耐腐蚀性能进行研究,在此基础上明确S32101点蚀评定标准和腐蚀性货品... 详细信息

考虑到节镍双相不锈钢的耐腐蚀性能与传统双相不锈钢存在差异,需要制定相应的点蚀评定标准和腐蚀性货品载运清单对其进行约束,通过腐蚀试验对节镍不锈钢S32101点蚀和耐腐蚀性能进行研究,在此基础上明确S32101点蚀评定标准和腐蚀性货品载运清单。研究成果可为约束节镍双相不锈钢的应用提供一定参考。

关键词：节镍双相不锈钢S32101 化学品船点蚀性能货品载运清单

An investigation of the influence of near-fault ground motion parameters on the pile's response in liquefiable soil

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Earthquake Engineering and Engineering Vibration 2018年第4期17卷 729-745页

作者： Hui Shuqing Tang Liang Zhang Xiaoyu Wang Youqing Ling Xianzhang xu bowen School of Civil Engineering Harbin Institute of Technology State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences

The performance of a soil-pile system can be significantly influenced by ground motion parameters. However, few research efforts have been performed to provide a complete description of the influence of key ground motion parameters on the pile’s behavior in liquefiable soil. In this study, a three-dimensional finite element（FE） model, incorporating a multisurface plasticity solid-fluid fully coupled formulation soil constitutive model, is developed and calibrated based on centrifuge test data. Seventy-two near-fault non-pulse-like（NF-NP） and seventy-two near-fault pulse-like（NF-P） ground motion records are studied with the calibrated FE model to distinguish the effects of several common ground motion parameters soon afterwards. Base on the parametric study results, a simple index, RPGV/PGA（i.e., the ratio of peak ground velocity（PGV） to peak ground acceleration（PGA））, shows its capability on characterizing the pile behavior under both NF-NP and NF-P ground motions. Furthermore, two equations are developed to characterize the relationships between the RPGV/PGA as well as the maximum pile’s moments and displacements. In general, this study can be helpful to gain new insights on the influence of typical index parameters for near-field ground motions on the response of the pile foundation in liquefiable soil.

关键词： seismic response predictive equations near-fault ground motion pile foundation liquefaction

Recent advances in traction drive technology for rail transit

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第3期24卷 177-188页

作者： Jien MA Chao LUO Lin QIU Xing LIU bowen xu Jiabo SHOU Youtong FANG College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

The traction drive system is the“heart”of rail transit *** development of sustainable,secure,economic,reliable,efficient,and comfortable contemporary rail transportation has led to increasingly stringent requirements for traction drive *** interest in such systems is constantly growing,supported by advancements such as permanent magnet(PM)motors,advanced electronic devices such as those using silicon carbide(SiC),new-generation insulating materials such as organic silicon,and advanced magnetic materials such as rare-earth magnets and amorphous *** has also been made in control methods,manufacturing technology,artificial intelligence(AI),and other advanced *** this paper,we briefly review the state-of-the-art critical global trends in rail transit traction drive technology in recent *** areas for research and the main obstacles hindering the development of the next-generation rail transit traction drive systems are also ***,we describe some advanced traction drive technologies used in actual engineering applications.

关键词： Rail transit Traction drive systems Artificial intelligence(AI) Permanent magnet(PM)motors Electronic devices