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Experimental crushing behavior and energy absorption of angular gradient honeycomb structures under quasi-static and dynamic compression

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Defence Technology（防务技术） 2024年第6期36卷 47-63页

作者： Jiachen Li Yuchen Wei Hao Wu Xingyu Shen mengqi yuan State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Institute of Occupational Health China Academy of Safety Science and TechnologyBeijing 100012China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

The high variability of shock in terrorist attacks poses a threat to people's lives and properties,necessitating the development of more effective protective *** study focuses on the angle gradient and proposes four different configurations of concave hexagonal honeycomb *** structures'macroscopic deformation behavior,stress-strain relationship,and energy dissipation characteristics are evaluated through quasi-static compression and Hopkinson pressure bar impact *** study reveals that,under varying strain rates,the structures deform starting from the weak layer and exhibit significant interlayer ***,interlayer shear slip becomes more pronounced with increasing strain *** terms of quasi-static compression,symmetric gradient structures demonstrate superior energy absorption,particularly the symmetric negative gradient structure(SNG-SMS)with a specific energy absorption of 13.77 J/cm~*** dynamic impact,unidirectional gradient structures exhibit exceptional energy absorption,particularly the unidirectional positive gradient honeycomb structure(UPG-SML)with outstanding mechanical *** angle gradient design plays a crucial role in determining the structure's stability and deformation mode during *** interlayer separations result in a more pronounced negative Poisson's ratio effect and enhance the structure's energy absorption *** findings provide a foundation for the rational design and selection of seismic protection structures in different strain rate impact environments.

关键词： Negative Poisson's ratio Gradient honeycomb structure Quasi-static compression Dynamic impact Titanium alloy

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趋化因子CCL2与肺癌的因果关系:两样本孟德尔随机化研究

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实用医学杂志 2024年第4期40卷 532-536页

作者：刘梓燊郑瑛瑛袁梦琪张甘霖杨国旺首都医科大学附属北京中医医院北京100010

目的探究趋化因子CCL2(又称单核细胞趋化蛋白1,MCP-1)与肺癌(lung cancer)是否具有因果关系。方法从全基因组关联研究(GWAS)提取趋化因子CCL2和肺癌不同病理分型的遗传数据,使用逆方差加权分析(IVW)作为主要分析,另选用加权中位数法、... 详细信息

目的探究趋化因子CCL2(又称单核细胞趋化蛋白1,MCP-1)与肺癌(lung cancer)是否具有因果关系。方法从全基因组关联研究(GWAS)提取趋化因子CCL2和肺癌不同病理分型的遗传数据,使用逆方差加权分析(IVW)作为主要分析,另选用加权中位数法、简单模式法、MR-Egger回归法、加权模式法进行补充分析,并进行敏感性分析验证数据的可靠性。结果趋化因子CCL2对肺腺癌的IVW分析结果OR=1.065,95%CI(0.919~1.234),P=0.401。趋化因子CCL2对肺鳞状细胞癌的IVW分析结果OR=1.059,95%CI(0.931~1.205),P=0.381。趋化因子CCL2对小细胞肺癌的IVW分析结果OR=0.959,95%CI(0.760~1.208),P=0.720。结论趋化因子CCL2与肺癌没有直接因果关系。

关键词：孟德尔随机化单核细胞趋化因子肺癌因果关系

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Rational design on separators and liquid electrolytes for safer lithium-ion batteries

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Journal of Energy Chemistry 2020年第4期29卷 58-70页

作者： mengqi yuan Kai Liu Department of Chemical Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

As the energy density of lithium-ion batteries (LIBs) continues to increase,their safety has become a great concern for further practical large-scale *** of the ultimate solution of the safety issue is to develop intrinsically safe battery components,where the battery separators and liquid electrolytes are critical for the battery thermal runaway *** this review,we summarize recent progress in the rational materials design on battery separators and liquid electrolyte towards the goal of improving the safety of ***,some strategies for further improving safety of LIBs are also briefly outlooked.

关键词： Lithium-ion battery Battery safety Electrolyte Separator Energy storage materials

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300M钢回火工艺对组织性能的影响

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新技术新工艺 2024年第3期435卷 44-51页

作者：李志俊袁梦琦陈杉张建强吕中惠郭云鹏内蒙古第一机械集团股份有限公司内蒙古包头014000

以特种车辆传动轴用300M钢材料为研究对象,通过调整回火温度,在200~350℃内以50℃为间隔调整回火温度分别进行一次回火和二次回火处理,对热处理后的试样进行金相组织、硬度、拉伸、冲击性能检测以及旋转弯曲疲劳试验,得出相应性能随热... 详细信息

以特种车辆传动轴用300M钢材料为研究对象,通过调整回火温度,在200~350℃内以50℃为间隔调整回火温度分别进行一次回火和二次回火处理,对热处理后的试样进行金相组织、硬度、拉伸、冲击性能检测以及旋转弯曲疲劳试验,得出相应性能随热处理参数的变化规律,优选热处理工艺参数,为生产实践提供理论依据和数据支撑。

关键词： 300M钢传动轴性能旋转弯曲疲劳寿命热处理参数

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A review of fire-extinguishing agent on suppressing lithium-ion batteries fire

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Journal of Energy Chemistry 2021年第11期30卷 262-280,I0006页

作者： Shuai yuan Chongye Chang Shuaishuai Yan Pan Zhou Xinming Qian mengqi yuan Kai Liu State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100084China Department of Chemical Engineering Tsinghua UniversityBeijing 100081China

Safety issue of lithium-ion batteries(LIBs)such as fires and explosions is a significant challenge for their large scale *** the continuously increased battery energy density and wider large-scale battery pack applications,the possibility of LIBs fire significantly *** of the fast burning and the easy re-ignition characteristics of LIBs,achieving an efficient and prompt LIBs fire suppression is critical for minimizing the fire *** from conventional fire hazards,the LIBs fire shows complicated and comprehensive characteristics,and an effective and suitable fire-extinguishing agent particularly designed for LIBs is highly *** efforts have been devoted to this topic,to the best of our knowledge,a comprehensive review on this regard is still ***,in practice,a guidance for the design and selections of a proper fire-extinguishing agent for LIBs is urgently ***,the special mechanisms and characteristics for LIBs fire and the corresponding design principles for LIBs fire-extinguishing agent were *** is revealed that a fire-extinguishing agent developed for LIBs fire will most likely need a high heat capacity,high wetting,low viscosity and low electrical *** a comprehensive comparison of these agents in terms of these performances,water-based fire-extinguishing agents show *** typical fire-extinguishing agents such as gaseous agents,dry powders,water-based and aerosol fire-extinguishing agents were then introduced,and their fire extinguishment mechanisms were ***,their effectiveness in suppressing the fire were ***-based fire-extinguishing agents possess high cooling capacity and excellent anti-reflash performance for the *** believe this review could shed light on developing an efficient fire-extinguishing agent particularly designed for LIBs.

关键词： Lithium-ion battery Battery safety Fire-extinguishing agent Fire suppression

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Mechanical Response of Honeycomb Structures Under Impact

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Journal of Beijing Institute of Technology 2020年第1期29卷 1-8页

作者： Yaxin Guo mengqi yuan Hang Zhang Xinming Qian State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

A honeycomb structure with a negative Poisson’s ratio(NPR)was designed,fabricated,and analyzed for utilization in personal protective clothing(PPC).The mechanical properties were investigated using a quasi-static mechanical testing and the Hopkinson pressure bar experimental system,and results were compared with similar samples containing regular hexagonal and regular quadrilateral honeycomb *** experimental results showed that under quasi-static loadings,the concave honeycomb structure had the highest compressive modulus and yield strength,which produced the highest strain absorption energy,anti-deformation performance and energy *** exposed to a dynamic load at a high strain rate,the concave honeycomb also exhibited the highest dynamic compression modulus,the best impact resistance and best energy absorption among the three *** summary,the concave honeycomb structure was more resistant to deformation and had higher impact resistance than the regular hexagonal and regular quadrilateral honeycombs,and exhibited better energy absorption,which makes it a good candidate for application as a personal safety protection material.

关键词： negative Poisson’s ratio effect quasi-static dynamic analysis energy absorption

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Controlling Town Industry Explosion Hazard in China

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International Journal of Disaster Risk Science 2016年第4期7卷 440-444页

作者： Huixin Yuwen Xueqiu He Xinming Qian mengqi yuan School of Mechanical Engineering Beijing Institute of Technology University of Science and Technology Beijing

This article introduces industrial safety issues encountered in the towns of China,points out the importance of damage control of industrial explosions and disaster management,and puts forward suggestions on safety de... 详细信息

关键词： Damage control Industrial explosion Safety design Town industry

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High-performance broadband photodetector based on PtSe2/MoS2 heterojunction from visible to near-infrared region

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Science China(Information Sciences) 2024年第3期67卷 263-270页

作者： Bin WANG Jian yuan mengqi CHE Mingxiu LIU Yuting ZOU Junru AN Fan TAN Yaru SHI Nan ZHANG Liujian QI Shaojuan LI State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences School of Physics and Electronic Information Huaibei Normal University

Broadband photodetectors based on narrow bandgap 2D materials have garnered considerable interest for application in the field of optoelectronic devices. However, their large dark current hinders device performance. In this work, a PtSe2/MoS2heterojunction was fabricated for a broadband photodetector operating within the range of visible to near-infrared. The device exhibited suppressed dark currents with a high rectification ratio of 104. The built-in electric field of the heterojunction promoted carrier separation effectively, and the device achieved excellent photoelectric performance with responsivities of 1.7 × 103,27.52, and 21 mA/W at 635, 785, and 1550 nm wavelengths, respectively. Moreover, the specific detectivities(D*) were 2.2 × 1013Jones(635 nm), 3.55 × 1011Jones(785 nm), and 2.72 × 108Jones(1550 nm). The device demonstrated a rise/fall time of 131/241 μs under 1550 nm laser illumination. Visible and near-infrared imaging detection was also demonstrated based on the heterojunction device at room temperature. This work sheds light on the remarkable potential of PtSe2/MoS2heterojunctions in the domain of high-performance broadband photodetectors.

关键词： photodetector PtSe$_{2}$/MoS$_{2}$ heterojunction visible to near infrared high performance

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Investigations on Structured Polyamide for Laser Sintered Body Armor

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Journal of Beijing Institute of Technology 2017年第1期26卷 38-44页

作者： Jinhui Jiang Xinming Qian mengqi yuan Tingchao Ji State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China

Stab resistance body armor（SRBA）is essential in protecting people from knife *** protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which causes heavy heat stress for people wearing *** protective parts of SRBA manufactured using laser sintering（LS）3D printing technology provide high manufacturing flexibility and low *** different structures,plain plate and pyramid-structured plate,were *** pyramid structure showed much higher stab resistance property then the plain plate,because of the angle and thickness *** is the first effort applying the LS technology and polyamide（PA）material（PA3200）on *** applying the pyramid structure on the protective layer of the SRBA,the total weight could reduce 30%-40%.

关键词： stab resistance body armor 3D printing laser sintering pyramid structure

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Large-scale experimental investigation of the effects of gas explosions in underdrains

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Journal of Safety Science and Resilience 2021年第2期2卷 90-99页

作者： Longfei Hou yuanzhi Li Xinming Qian Chi-Min Shu mengqi yuan Weike Duanmu State Key Laboratory State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Center for Process Safety and Industrial Disaster Prevention National Yunlin University of Science and TechnologyDouliuYunlin 64002TaiwanChina Anhui Theone Safety Technology Co. Ltd.Hefei230088China Hefei institute for Public Safety Research Tsinghua UniversityHefei 230601China

This study involved the construction and explosion of a large-scale(80-meter-long)underdrain and detailed investigations of the damaging impacts of a gas explosion to provide an experimental foundation for similarity modeling and infrastructural *** experiment vividly recreated the scene and explosion damage of the"11.22″explosion accident in Qingdao,China,thus allowing for evaluations of the movements and destruction of the cover *** damage mechanism was determined by analyzing the overpressure curves inside and outside the underground *** was determined that the cover plates were first lifted by the precursor wave,which induced a maximum overpressure of 0.06 MPa and resulted in explosion *** pressure entered the deflagration stage at the end of the *** combustion wave overpressure reached 3.115 MPa close to the initiation point,and had a significant influence on the projectile energy of the cover plates ***,64%of the cover plates were only affected by the precursor wave,while 36%of the cover plates were subjected to both the precursor wave and the combustion wave;these cover plates were severely *** results of this study provide fundamental insights relevant to the prevention and control of underdrain gas explosions.

关键词： Damage mechanism Overpressure curve Underdrain explosion Explosion venting Precursor wave

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