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Explosion resistance performance of reinforced concrete box girder coated with polyurea:Model test and numerical simulation

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Defence Technology（防务技术） 2024年第3期33卷 1-18页

作者： Guangpan Zhou Rong Wang Mingyang Wang jianguo ding Yuye Zhang School of Science Nanjing University of Science and TechnologyNanjing 210094JiangsuChina School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina State Key Laboratory of Explosion and Impact and Disaster Prevention and Mitigation Army Engineering University of PLANanjing 210007JiangsuChina

To study the anti-explosion protection effect of polyurea coating on reinforced concrete box girder,two segmental girder specimens were made at a scale of 1:3,numbered as G(without polyurea coating)and PCG(with polyurea coating).The failure characteristics and dynamic responses of the specimens were compared through conducting explosion tests.The reliability of the numerical simulation using LS-DYNA software was verified by the test results.The effects of different scaled distances,reinforcement ratios,concrete strengths,coating thicknesses and ranges of polyurea were studied.The results show that the polyurea coating can effectively enhance the anti-explosion performance of the girder.The top plate of middle chamber in specimen G forms an elliptical penetrating hole,while that in specimen PCG only shows a very slight local dent.The peak vertical displacement and residual displacement of PCG decrease by 74.8% and 73.7%,respectively,compared with those of specimen G.For the TNT explosion with small equivalent,the polyurea coating has a more significant protective effect on reducing the size of fracture.With the increase of TNT equivalent,the protective effect of polyurea on reducing girder displacement becomes more significant.The optimal reinforcement ratio,concrete strength,thickness and range of polyurea coating were also drawn.

关键词： Explosive load Explosion resistance performance Model test Polyurea Concrete box girder Numerical simulation

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A duplex TaqMan probe-based real-time PCR method for rapid detection and differentiation of the classical and VB strains of human immunodeficiency virus

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Science China(Life Sciences) 2024年第1期67卷 208-210页

作者： Aiping Wang Haili Wang jianguo Zhao Yumei Chen Hongliang Liu Peiyang ding Yan Niu Gaiping Zhang Longhu Laboratory Zhengzhou 450046China School of Advanced Agricultural Sciences Peking UniversityBeijing 100871China

Dear Editor,Human immunodeficiency virus(HIV)is a lentivirus that,if left untreated,can lead to acquired immunodeficiency syndrome(AIDS).The virus can be divided into two types based on genetic differences:HIV-1 and HIV-2.HIV-1 is widely distributed worldwide and is the primary strain responsible for the global AIDS epidemic due to its high replication capacity,greater likelihood of transmission,and more severe clinical symptoms(Oeschger et al.,2021).

关键词： immunodeficiency untreated

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Residual alkali-evoked cross-linked polymer layer for anti-air-sensitivity LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)cathode

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Journal of Energy Chemistry 2024年第5期92卷 450-458页

作者： Chao Zhao Xuebao Li Yun Zhao Jingjing He Yuanpeng Cao Wei Luo ding Wang jianguo Duan Xianshu Wang Baohua Li National and Local Joint Engineering Research Center of Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093YunnanChina School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055Guangdong China City College Kunming University of Science and TechnologyKunming 650051YunnanChina

High-energy density lithium-ion batteries(LIBs)with layered high-nickel oxide cathodes(LiNi_(x)Co_(y)Mn_(1-x-y)O_(2),x≥0.8)show great promise in consumer electronics and vehicular applications.However,LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)faces challenges related to capacity decay caused by residual alkalis owing to high sensitivity to air.To address this issue,we propose a hazardous substances upcycling method that fundamentally mitigates alkali content and concurrently induces the emergence of an anti-air-sensitive layer on the cathode surface.Through the neutralization of polyacrylic acid(PAA)with residual alkalis and then coupling it with 3-aminopropyl triethoxysilane(KH550),a stable and ion-conductive cross-linked polymer layer is in situ integrated into the LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)(NCM)cathode.Our characterization and measurements demonstrate its effectiveness.The NCM material exhibits impressive cycling performance,retaining 88.4%of its capacity after 200 cycles at 5 C and achieving an extraordinary specific capacity of 170.0 mA h g^(-1) at 10 C.Importantly,this layer on the NCM efficiently suppresses unfavorable phase transitions,severe electrolyte degradation,and CO_(2)gas evolution,while maintaining commendable resistance to air exposure.This surface modification strategy shows widespread potential for creating air-stable LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)cathodes,thereby advancing high-performance LIBs.

关键词： Lithium-ion batteries Nickel-rich layered cathode Residual alkalis Cross-linked polyme rmodification Airsensitivity

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Research Progress in the Treatment of Poststroke Depression with Traditional Chinese Medicine

Research and Inheritance of Traditional Chinese Medicine

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Research and Inheritance of Traditional Chinese Medicine 2024年第1期2卷 33-37页

作者： jianguo Duan Yuan ding Yating Shao The First Clinical Medical College of Heilongjiang University of Traditional Chinese Medicine

In recent years,the incidence rate of stroke has increased year by year.Post stroke depres‐sion is one of its main complications,which seriously affects the recovery of physiological functions and quality of life of stroke patients.Traditional Chinese medicine has signifi‐cant therapeutic effects in treating this disease.This article provides a classification and review of traditional Chinese medicine treatment methods for post-stroke depression,and looks forward to the current problems.

关键词： traditional Chinese medicine post stroke depression research progress

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基于精益六西格玛的磨辊间横向辊印改善研究

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新疆钢铁 2024年第2期 89-91页

作者：丁建国赵爽华北理工大学研究生学院河北唐山063200 首钢京唐钢铁联合有限责任公司河北唐山063200

文章针对某钢厂磨辊间加工的轧辊横向辊印不良率高问题,通过阐述运用精益六西格玛DMAIC方法进行系统性分析,采用属性一致性分析方法验证输出的真实性,利用流程分析、因果矩阵、潜在失效模式以及后果分析等工具识别因子,借助双样本T检验... 详细信息

文章针对某钢厂磨辊间加工的轧辊横向辊印不良率高问题,通过阐述运用精益六西格玛DMAIC方法进行系统性分析,采用属性一致性分析方法验证输出的真实性,利用流程分析、因果矩阵、潜在失效模式以及后果分析等工具识别因子,借助双样本T检验和Logistic回归分析筛选确认关键因子,设计DOE实验和RSM响应曲面实验进行因子验证,优化关键因子参数,最终针对性地提出综合性控制措施。

关键词：精益六西格玛轧辊横向辊印改善

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皖南伏岭A型花岗岩的成因——地球化学、锆石U-Pb年龄及Lu—Hf同位素特征

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地质论评 2024年第1期70卷 189-206页

作者：郑伟陈天虎杜建国陈芳丁宁张舒合肥工业大学资源与环境工程学院合肥230009 安徽省地质调查院(安徽省地质科学研究所) 合肥230001 自然资源部覆盖区深部资源勘查工程技术创新中心合肥230001

伏岭花岗岩体,位于江南造山带东段的皖浙相邻区,岩浆岩沿着近北东向的宁国—绩溪深大断裂断分布。笔者等对伏岭岩体鱼龙川(γ_(5)^(3-2))单元花岗岩开展了系统的全岩岩石地球化学、LA-ICPMS锆石U-Pb同位素年龄和锆石原位Lu—Hf同位素地... 详细信息

伏岭花岗岩体,位于江南造山带东段的皖浙相邻区,岩浆岩沿着近北东向的宁国—绩溪深大断裂断分布。笔者等对伏岭岩体鱼龙川(γ_(5)^(3-2))单元花岗岩开展了系统的全岩岩石地球化学、LA-ICPMS锆石U-Pb同位素年龄和锆石原位Lu—Hf同位素地球化学研究,结果表明,花岗岩的侵位年龄为131.8±0.9 Ma,富硅、富碱、贫钙、贫铁,具有较高的Rb、Th、U、Ga、Zr和Y含量,较低的Sr、Ba和Nb含量,稀土配分曲线呈现典型的“海鸥式”分布特征,显示强烈的负Eu异常;微量元素原始地幔标准化蛛网图显示明显的Ba、Sr、Nb的负异常。其高SiO_(2)含量和Rb/Sr值、低Ba、Sr含量具备江南造山带东段皖南地区A型花岗岩的典型特征。岩体具有同源岩浆演化特征,源区可能存在磷灰石、钛铁矿的分离结晶作用,而辉石类的分离较少。伏岭岩体主要来源于地壳中镁铁质岩石的部分熔融,其地球化学特征继承于源岩。锆石ε_(Hf)(t)变化范围较小,均在-7.0~-4.6之间,二阶段模式年龄(TDM2)为1478~1630 Ma,伏岭花岗岩可能由中元古代古老下地壳部分熔融形成。伏岭岩体的形成可能受到碰撞作用的影响,岩体形成于后碰撞期,中元古代的基底岩石被大范围的熔融,从而产生了伏岭A型花岗岩。

关键词：伏岭 A型花岗岩岩石地球化学锆石U-Pb年龄 Lu—Hf同位素构造环境江南造山带皖南

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Effect of Grain Size and Compression Direction on the Hot Deformation Characteristics of High-Cr Ultra-Super-Critical Rotor Steel with Columnar Grains

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 803-813页

作者： Yanyang Wu Qiaodan Hu Zongye ding jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225China WuYang Iron and Steel Wugang450000China

The columnar grains with a duplex grain size distribution in the ingot increase the difficulty of the hot forging of the as-cast high Cr ultra-super-critical rotor steel.The hot deformation behaviors of the high Cr steel with different initial grain sizes under various compression directions were investigated.The results show that the hot deformation characteristic is strongly grain size and compression direction dependent.The finer grain size and compression direction perpendicular to the columnar grains increase the flow stress and activation energies of hot deformation,comparing with the large grain and deformation direction parallel to the columnar grains.The relationships between flow stress and deformation parameters for the different initial structures conform to the established constitutive equations.The former enhances the critical stress of the dynamic recrystallization(DRX),inhibiting the occurrence of DRX and reducing the dimensions of DRX grains.

关键词： High Cr ultra-super-critical rotor steel Solidification Hot deformation Dynamic recrystallization Critical stress

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天空地多层异构融合网络性能分析及切换协议优化

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数据采集与处理 2024年第1期39卷 95-105页

作者：周赫高晓铮丁旭辉李建国李宗凌杨凯北京空间飞行器总体设计部北京100094 北京理工大学信息与电子学院北京100081 北京理工大学网络空间安全学院北京100081

针对多层异构融合网络(Multi-layer heterogeneous integrated network, MLHetINet)切换复杂的问题,提出通过凝视波束及干扰消除算法获取切换分析的有效数据,简化波束对准及捕获过程,扩展空基网络覆盖范围,进而降低跨层切换的复杂度。首... 详细信息

针对多层异构融合网络(Multi-layer heterogeneous integrated network, MLHetINet)切换复杂的问题,提出通过凝视波束及干扰消除算法获取切换分析的有效数据,简化波束对准及捕获过程,扩展空基网络覆盖范围,进而降低跨层切换的复杂度。首先,针对地面终端和空中基站间的相对高速运动特性,提出空基凝视多波束形成算法,自适应地调整天线相位和权值,在目标方向生成主瓣并对干扰源进行零陷实现空域隔离,简化切换分析的复杂度。然后针对空地信道的复杂性,提出了基于列范数分组排序的多阶干扰消除算法,进一步提高目标信号的检测精度,提高切换分析的准确性。最后,依靠凝视波束技术和干扰消除算法,针对空天地三维多层异构融合网络中的切换事件设计了独立的切换协议,显著降低了网络资源的消耗。仿真结果表明,相较于传统地面网络和天地融合网络,所提波束赋形辅助的天空地多层异构融合网络中的用户信息速率有显著提升。

关键词：多层异构融合网络移动切换分析波束赋形干扰消除切换协议优化

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Foaming biocompatible and biodegradable PBAT/PLGA as fallopian tube stent using supercritical carbon dioxide

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Chinese Journal of Chemical Engineering 2022年第7期35卷 245-253页

作者： Yue Wang Luyao Huan Haiyan Liang Xuejia ding jianguo Mi Department of Obstetrics and Gynecology China-Japan Friendship HospitalNo.2Yinghuayuandong RoadBeijing 100029China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyNo.15Beisanhuandong RoadBeijing 100029China

Tubal pregnancy is a common abnormal pregnancy manifestation,and the ordinary conservative treatment of tubal adhesion usually leads to the rupture of fallopian tube,which increases the risk of a second ectopic pregnancy.To avoid this symptom,it is suitable to implant a stent to separate the adhesion.Here we prepared the PBAT/PLGA foam as the stent material using supercritical CO_(2) foaming technology.With uniform macroporous structure and thin-wall feature,the foam possessed low compressive modulus in prevention of the possible second injury to the fallopian tube.The introduction of PLGA 50/50 improved the biodegradable capability of the foam,with a mass loss about 20% after a 12-week hydrolysis.After implanted into the ruptured fallopian tube of the rabbit model,the foam displayed excellent biocompatibility,and provided a good support to prevent tubal adhesion.As such,this work provides the foam material as a promising candidate for fallopian tube stent to remedy the tubal adhesion.

关键词： Bio-foam Tissue engineering Low compressive modulus Rapid hydrolysis

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3D morphological evolution and growth mechanism of proeutectic FeAl_(3) phases formed at Al/Fe interface under different cooling rates

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Journal of Materials Science & Technology 2022年第21期116卷 83-93页

作者： Naifang Zhang Qiaodan Hu Zongye ding Wenquan Lu Fan Yang jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong University200240 ShanghaiChina School of Mechanical Engineering Shanghai Jiao Tong University200240 ShanghaiChina

The 3D morphologies and growth mechanisms of proeutectic FeAl_(3) at the Al/Fe interface under different cooling rates were studied by synchrotron X-ray tomography.With increasing cooling rate,FeAl_(3) crystals developed from faceted polygonal prism,plates with flat surface,thin ribbon-like with periodic undulating surface to non-faceted rods with radial dendrites in cross section,indicating a gradual interface growth mode transition from two-dimensional layer growth to continuous growth.At a higher cooling rate,twinning mechanism plays a leading role in the formation and growth of FeAl_(3).A link between the morphologies,twinning and crystallographic structure was established based on quantitative analyses on the 3D structures.

关键词： Solidification 3D morphology FeAl_(3)Internetallic compounds Cooling rate Synchrotron radiation Al/Fe interface

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