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水泥-石灰-磷石膏固化赤泥的路用基层性能

长江科学院院报 2024年第1期41卷 114-120页

作者：石名磊田新涛王华进余昌运杜旭阳张瑞坤东南大学交通学院南京210096 江苏华宁工程咨询有限公司南京210096

基于磷石膏硫激发作用水泥-石灰固化赤泥,开展了固化赤泥无侧限抗压强度、抗劈裂、抗回弹力学性能和干湿、冻融耐久性能等路用性能的室内试验,探究了该固化赤泥应用道路基层的可行性。试验结果表明:采用固化剂配比m水泥∶m石灰∶m磷石... 详细信息

基于磷石膏硫激发作用水泥-石灰固化赤泥,开展了固化赤泥无侧限抗压强度、抗劈裂、抗回弹力学性能和干湿、冻融耐久性能等路用性能的室内试验,探究了该固化赤泥应用道路基层的可行性。试验结果表明:采用固化剂配比m水泥∶m石灰∶m磷石膏=8∶2∶2的固化赤泥路用基层性能最佳,7 d无侧限抗压强度为4.18 MPa,满足基层强度要求;28 d劈裂强度和回弹模量分别为0.256、1020 MPa;五级干湿和冻融循环后,质量变化率<2%,强度损失指标BDR均在80%以上。压汞试验从微观揭示了磷石膏反应产生的钙矾石,通过填充孔隙(0.1~1μm),增强固化赤泥强度;过量钙矾石使得固化赤泥体积膨胀,产生微裂缝孔隙(1~10μm),强度性能劣化。综合固化赤泥性能试验结果,使用m赤泥∶m水泥∶m石灰∶m磷石膏=100∶8∶2∶2配合比制备的固化赤泥替代传统路面基层材料是可行的,拓宽了赤泥综合利用的途径。

关键词：赤泥道路工程道路基层无侧限抗压强度路用性能

Exponential stability and periodic solution for fuzzy BAM Neural networks with time varying delays

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Applied Mathematics(A Journal of Chinese Universities) 2009年第2期24卷 157-166页

作者： XIANG Hong-jun wang jin-hua Department of Mathematics, Xiangnan University, Chenzhou 423000, China Department of Mathematics Xiangnan University Chenzhou China

In this paper, a class of fuzzy BAM neural networks with time varying delays is discussed. By using the properties of M-matrix, Linear Matrix Inequality（LMI） approach and general Lyapunov-Krasovskii functional, some new sufficient conditions are derived to ensure the existence of periodic solutions and the global exponential stability of the fuzzy BAM neural networks with time varying delays. These results have important significance in the design of global exponential stable BAM networks with delays. Moreover, an example is given to illustrate that the conditions of the results in the paper are feasible.

关键词： fuzzy BAM neural network periodic solution exponential stability linear matrix inequality(LMI) Lyapunov-Krasovskii functional

Existence of Positive Solution to a Singular System of Nonlinear Fractional Differential Equation

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Chinese Quarterly Journal of Mathematics 2010年第4期25卷 582-588页

作者： wang jin-hua XIANG Hong-jun Department of Mathematics Xiangnan UniversityChenzhou 423000China

In this paper,we discuss a singular system of nonlinear fractional differential equation,in which the inhomogeneous term depends on the fractional derivative of lower *** using the Krasnoselskii＇s fixed point theorem and the Leray-Schauder nonlinear alternative method,some suffcient conditions for the existence of positive solution of the singular system are obtained.

关键词： fractional differential equation positive solution fixed point theorem

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U形沟一次成型模板施工技术研究与应用

建筑技术 2024年第16期55卷 1987-1990页

作者：王茂王锦华李祯吕东晓王鹏贺兵雄民航机场建设工程有限公司天津300456

模板工艺是影响现浇混凝土成型效果的重要因素。针对工程中U形沟二次浇筑成型施工缝衔接质量差、工效低、进度慢等问题,经深入研究分析,优化改进为一次成型装配式组合模板施工技术,取得了浇筑成型质量高、建设工期短、建造成本低的效果... 详细信息

模板工艺是影响现浇混凝土成型效果的重要因素。针对工程中U形沟二次浇筑成型施工缝衔接质量差、工效低、进度慢等问题,经深入研究分析,优化改进为一次成型装配式组合模板施工技术,取得了浇筑成型质量高、建设工期短、建造成本低的效果。通过工程实例,系统全面地介绍了U形沟一次成型模板施工技术,可为类似工程提供参考。

关键词： U形沟一次成型模板施工

Dynamic responses of series parallel-plate mesoscopic capacitors to time-dependent external voltage

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Chinese Physics B 2015年第11期24卷 448-451页

作者：王锦华全军 College of Public Administration Huazhong University of Science and Technology School of Physics Science and Technology Lingnan Normal University

We investigate the dynamic responses of the series parallel-plate mesoscopic capacitors to a time-dependent external voltage. The results indicate that the quantum coherence between two capacitors strongly depends on the frequency of the external voltage and the distance between the two capacitors （c-c distance）. The behaviors of the series capacitance incompletely follow the Kirchhoff＇s laws; only in the low frequency case or the limit of the c-c distance, the capacitance approaches to the classical series capacitance. In addition, the real part of the frequency-dependent capacitance shows a maximum and a minimum, which appear around the peak of the imaginary part. These phenomena may be associated with the plasmon excitation in the mesoscopic capacitors.

关键词： electron transport mesoscopic capacitor capacitance quantum coherence

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施工定位放线机器人的组合定位融合算法研究

建筑机械 2024年第9期 57-64,69页

作者：王效义邹维军张建伟李强王进花甘肃新瑞城市建设有限公司甘肃兰州730000 兰州理工大学电气工程与信息工程学院甘肃兰州730050

一直以来,建筑施工放线的工作大多都由人工来完成,导致施工放线工作效率低,速度缓慢且精度方面往往误差较大。本章设计研发了1款智能定位放线机器人,该放线机器人在接收到手持终端传送的建筑施工放线图后,按照图纸可自主规划行进线路,... 详细信息

一直以来,建筑施工放线的工作大多都由人工来完成,导致施工放线工作效率低,速度缓慢且精度方面往往误差较大。本章设计研发了1款智能定位放线机器人,该放线机器人在接收到手持终端传送的建筑施工放线图后,按照图纸可自主规划行进线路,并利用RTK卫星信号接收机、MIMU微惯性测量传感器和HALL编码器结合UKF融合算法进行实时定位,在行进过程中实时调整位置、速度和姿态,最终实现自动、准确的定位放线工作,其定位精度可达到毫米级。

关键词： RTK MIMU UKF HALL编码器

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Microstructural Evolutions and Mechanical Properties of Energetic Al_(1) (TiZrNbTaMoCr)_(15) High-Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 620-632页

作者： Xuan-Hong Cai Zhen-hua wang Ben Niu jin-Feng Li Qing wang Show authors Key Laboratory of Materials Modification By Laser Ion and Electron Beams(Ministry of Education)Engineering Research Center of High Entropy Alloy Materials(Liaoning Province)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Institute of Materials China Academy of Engineering PhysicsMianyang621908China

The present study focuses on investigating the microstructural evolutions and mechanical properties of energetic Al_(1)(TiZrNbTaMoCr)_(15) refractory high-entropy alloys with the different heat treatments at low Al content state. It is found that even with a reduction in the Al content, the strength of these alloys remains unaffected at room temperature and high temperature, while the plasticity improves significantly. In particular, the coherent BCC/B_(2) microstructure with needle-like B_(2) nanoprecipitates dispersed into the BCC matrix is formed in 873 K-aged Al_(1)Ti_(6)Zr_(2)Nb_(3)Ta_(3)Mo_(0.5)Cr_(0.5) alloy. Therefore, this alloy exhibits the highest compression yield strength (σ_(YS) = 1333 and 717 MPa) at room temperature and 1073 K, respectively. After 973 K-aged, the coherent BCC/B_(2) microstructure underwent destabilization, and the B_(2) phase transforms into the brittle Zr5Al3 phase which then coarsens and dominates the microstructure of S3-AlTa_(3) alloy after 1073 K-aged. Moreover, these current alloys exhibit exceptionally high theoretical exothermic enthalpy (ΔH), surpassing 11606 J·g^(−1), which highlights their significant potential as innovative high-performance energetic structural materials.

关键词： Refractory high-entropy alloy Coherent microstructure Mechanical property Exothermic enthalpy

Treatment of multisystem inflammatory syndrome in children

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World Journal of Pediatrics 2024年第4期20卷 325-339页

作者： Tong Tong Yi-hua jin Min wang Fang-Qi Gong Department of Cardiology Children's HospitalZhejiang University School of MedicineNational Clinical Research Center for Child HealthNo.3333 Binsheng RoadHangzhou 310052China

Background Multisystem inflammatory syndrome in children(MIS-C),a relatively uncommon but severe pediatric complication,is associated with coronavirus disease 2019(COVID-19).A variety of treatment approaches,including intravenous immunoglobulins(IVIGs),glucocorticoids(GCs)and biologic agents,such as anakinra and infliximab,have been described for the management of COVID-19-related *** therapy is also ***,a well-developed treatment system has not been established,and many issues remain *** recently published articles related to the treatment of MIS-C have been ***,in this review,we identified relevant articles published recently and summarized the treatment of MIS-C more comprehensively and *** sources We reviewed the literature on the treatment of MIS-C through 20 September *** PubMed/Medline,Web of Science,EMBASE,and Cochrane Library databases were searched with the combination of the terms"multisystem inflammatory syndrome","MIS-C","PIMS-TS","therapy","treatment","drug","IVIG","GCs","intravenous immunoglobulin","corticosteroids","biological agent",and"aspirin".Results The severity of MIS-C varies,and different treatment schemes should be used according to the specific *** research and data collection are vital to better understand the pathophysiology and optimal management of *** MIS-Cis a disease involving multiple systems and has great *** the accumulation of additional experience,we have garnered fresh insights into its treatment ***,there remains a critical need for greater standardization in treatment protocols,alongside the pressing necessity for more robust and meticulously conducted studies to deepen our understanding of these protocols.

关键词： Coronavirus disease 2019-Corticosteroids Intravenous immunoglobulin Multisystem inflammatory syndrome in children-Treatment

High-resolution remote thermometry based on Bi^(3+)-doped 0D zinc halide hybrids

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Science China Chemistry 2024年第8期67卷 2599-2605页

作者： Cui-Mi Shi Shu-hua Xue jin-Yun wang Liang-jin Xu Zhong-Ning Chen State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science Technology Innovation Laboratory for Optoelectronic Information of ChinaFuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China

Developing highly sensitive optical thermometers is of great significance due to their capability to enable remote and non-contact temperature measurements, rendering them highly applicable in diverse and harsh environments. Herein we report a temperature-dependent phosphor of 0D metal halide hybrid by incorporating Bi^(3+)into the(MePPh_(3))_(2)ZnCl_(4) matrix. Through Bi^(3+)doping,the initially non-luminescent(MePPh_(3))_(2) ZnCl_(4) matrix exhibits a deep-blue emission centered at 453 nm, with a photoluminescence quantum yield(PLQY) of 5.71% and a Stokes shift of 75 nm at room temperature. Experimental characterization demonstrates that exciton-like luminescence of Bi^(3+)is mainly responsible for the blue emission. Single crystals of Bi^(3+)-doped(MePPh_(3))_(2)ZnCl_(4) show an unusual correlation between photoluminescence(PL) lifetime and temperature. Particularly, the dependence of luminescence lifetime on temperature is most remarkable in the temperature range of 80 to 100 K with an exceptional sensitivity up to 0.09 K^(-1), representing one of the best levels for thermometry based on PL decay lifetime. Our work not only provides a viable strategy for designing a novel, environmentally friendly, and stable blue emitter, but also paves the way for precise thermometric application at low temperature.

关键词： lead-free hybrids Bi^(3+)doping blue emission temperature sensing

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