关于地下结构轴力监测方法的一点看法

结合工程实例 ,分析了目前地下结构轴力监测中一些不当的做法 ,并且提出了一种简便可行的替代方法 ,即用混凝土应力控制代替轴力控制的方法     

混凝土结构火灾后的检测方法研究

本文通过对混凝土结构火灾后的火场温度确定分析以及不同方法检测火灾后混凝土的强度试验，系统地研究了混凝土结构在遭受火灾后的检测方法．提出了一些有效的检测手段。     

大运河工业遗产廊道的保护层次

大运河(主要是江南运河段)在中国近现代工业史上具有重要意义,各历史时期工业发展在运河沿线遗留下了丰富的工业遗产.在目前运河工业遗产正面临着严峻的保护与改造的压力下,通过建立"工业遗产廊道"以实现大运河工业遗产的整体保护与利用,具有重要的理论与现实意义.运河工业遗产廊道的保护可以分为区域-城市-历史工业聚集区-相关企业及单位-建构筑物五个层次,并主要从四个层次制定相应的保护与再利用策略.     

Effect of building integrated photovoltaics on microclimate of urban canopy layer

Building integrated photovoltaics (BIPV) has potential of becoming the mainstream of renewable energy in the urban environment. BIPV has significant influence on the thermal performance of building envelope and changes radiation energy balance by adding or replacing conventional building elements in urban areas. PTEBU model was developed to evaluate the effect of photovoltaic (PV) system on the microclimate of urban canopy layer. PTEBU model consists of four sub-models: PV thermal model, PV electrical performance model, building energy consumption model, and urban canyon energy budget model. PTEBU model is forced with temperature, wind speed, and solar radiation above the roof level and incorporates detailed data of PV system and urban canyon in Tianjin, China. The simulation results show that PV roof and PV façade with ventilated air gap significantly change the building surface temperature and sensible heat flux density, but the air temperature of urban canyon with PV module varies little compared with the urban canyon of no PV. The PV module also changes the magnitude and pattern of diurnal variation of the storage heat flux and the net radiation for the urban canyon with PV increase slightly. The increase in the PV conversion efficiency not only improves the PV power output, but also reduces the urban canyon air temperature.     

国家体育馆钢屋架施工过程中支撑体系的受力分析与安全监控

大跨度钢结构在公共建筑中的使用日益广泛,钢屋架的高空滑移施工技术也日趋完善,在高空滑移施工过程中,支撑体系的安全与稳定至关重要. 对国家体育馆钢屋架施工过程中支撑体系的受力特点进行分析,对施工方案进行优化论证,阐述了如何开展安全监控工作.     

高压APF-SVG在洋山四期工程中的应用实例

上海国际航运中心洋山深水港区四期工程是国内首个全自动化集装箱码头.港区采用国际上最新一代自动化集装箱装卸设备,部分变电所供电设备数量较多,作业时产生极大的冲击负荷且谐波叠加后超标的几率较高.因此,在变电所内配置高压有源动态滤波及无功补偿装置(APF-SVG),进行就地集中治理,有效优化港区电网电能质量,节能降耗,以促进绿色低碳港口的建设.     

Site-selective occupation and luminescence property investigation of Ca18Na3Y(PO4)14:Eu2+ phosphor for full-spectrum LED

Cyan-emitting phosphors have attracted widespread attention as an integral part to realize full-spectrum lighting. Understanding the site occupation of luminescence centers is of great importance to design and clarify the luminescent mechanism for new cyan-emitting phosphors. Here, we report a cyan-emitting phosphor Ca₁₈Na₃Y(PO₄)₁₄:Eu²⁺ synthesized by the high-temperature solid-state method. The crystal structure is characterized by X-ray diffraction and refined by the Rietveld method. The diffuse reflectance spectra, excitation/emission spectra, fluorescence decay curves, thermal stability, and related mechanism are systematically studied. The results show that Ca₁₈Na₃Y(PO₄)₁₄:Eu²⁺ crystallizes in a trigonal crystal system with space group R3c. Under excitation at 350 nm, a broadband cyan emission can be obtained at 500 nm with a half-width of about 120 nm, which is caused by Eu²⁺ occupying five different sites in host, namely, Na2O₁₂ (450 nm), (Ca3/Na1)O₈ (485 nm), Ca2O₈ (515 nm), Ca1O₇ (565 nm), and (Ca4/Y)O₆ (640 nm), respectively. Moreover, crystal structure, room and low temperature spectroscopy, and luminescence decay time are used to skillfully verify the site-selective occupation of Eu²⁺. Finally, a full-spectrum light-emitting diode (LED) lamp is fabricated with an improved color rendering index (∼90.3), CCT (∼5492 K), and CIE coordinates (0.332, 0.318). The results show that Ca₁₈Na₃Y(PO₄)₁₄:Eu²⁺ has the potential to act as a cyan emission phosphor for full-spectrum white LEDs.     

Large electrocaloric effect with ultrawide temperature span in Na1/2Bi1/2TiO3-based lead-free ceramics

Innovative cooling technologies are recognized by many industries as a crucial part of their system design. A large electrocaloric effect (ECE) and extended working temperature are the key issues hindering the realization of electrocaloric refrigeration technology. In this work, large ECE (ΔT = 0.8–0.9°C @ 4 kV/mm) with an ultrawide temperature span from 30 to 120°C is noted for lead-free (Na_1/2Bi_1/2)_0.80Sr_0.20(Zn_1/3Nb_2/3)_xTi_1-xO₃ ceramics. The excellent ECE performance can be ascribed to the evolution of polar nanoregions. Our work suggests that this material is promising for applications in solid-state refrigeration systems with a broad range of operating temperatures.     

Enzymatic biosensor for nitrite detection based on direct electron transfer by CPO-ILEMB/Au@MoS2/GC

Journal of Applied Electrochemistry - A novel nitrite electrochemical biosensor is constructed by glassy carbon electrodes (GC) coated by chloroperoxidase (CPO) -Au nanoparticles-MoS2 nanoflowers...     

持久疏水涂层织物的制备及其油水分离性能研究

以甲基三乙氧基硅烷（ MTES）为原料,采用溶胶 -凝胶法,在 MTES溶胶中引入端羟基聚二甲基硅氧烷（ PDMS-OH）柔性疏水链段,制得聚硅氧烷凝胶,研究了柔性疏水链段对聚硅氧烷凝胶的柔韧性及疏水性的影响;采用浸渍涂覆的方法,在聚酯织物表面负载聚硅氧烷凝胶,固化后制备得到涂层织物。采用红外光谱（ FT-IR）、抗弯模量和水接触角,对聚硅氧烷凝胶及织物涂层的结构、柔韧性、疏水稳定性及其耐久性进行表征。结果表明： PDMS-OH能够大幅提高涂层织物的柔韧性和疏水性,在聚硅氧烷溶胶中,加入 0. 10 mol端羟基含量为 8. 5%的 PDMS-OH时,涂层织物的静态水接触角可达到（ 138±2）°,且具有持久的稳定性;同时,油水分离实验结果表明,制备的涂层织物可以实现以正己烷、苯和苯胺为代表的烷烃、芳香烃类等油水混合物的有效分离。