蒸汽爆炸粗混合阶段冷液中高温球传热阻力耦合特性的实验研究

采用蒸发电力模型,设计了高温颗粒同水相互作用的实验装置,进行了一系列单个,多个粒子在不同温度,不同入水初速度和不同冷液过冷度情况下的系列阻力实验,初步实验分析表明,高温颗粒在刚刚穿过冷液表面的下沉速度明显低于冷态颗粒的速度,实验值与蒸发曳力模型计算值符合较好.     

剪力环对钢管混凝土粘结强度影响的试验

通过对3根设置剪力环，3根不设剪力环，直径相同、厚度相同的试件进行研究，分析了钢管与混凝土之间的粘结性能、破坏机理，探究了影响其强度的主要因素．     

Monitoring Moisture Uptake and Delamination in CFRP-Reinforced Concrete Structures with Electrochemical Impedance Sensors

Electrochemical impedance spectroscopy (EIS) sensors have been used to inspect carbon fiber reinforced polymer (CFRP) -reinforced concrete structures exposed to a variety of test conditions. Similar specimens were also used to investigate the detection of delamination between the CFRP and the concrete using a modified wedge test configuration. The use of external electrodes attached to the CFRP surface, coupled with the embedded rebar, provided the best results. Equivalent circuit modeling was used to analyze the impedance spectra. Several circuit parameters, especially the capacitance and constant phase element (CPE) magnitude, correlated very well with both bonded area/delamination and moisture. Both parameters exhibit a linear relationship with delamination area. The capacitance also showed a linear relationship with moisture content while the CPE was more strongly dependent on moisture. Differences in the response of the specimens subjected to the different exposure conditions were seen and explained based on the moisture uptake of the various specimens.     

新旧混凝土界面结合状态研究

研究了在不同的界面干湿状态下，几种常见的修补材料和界面剂对新旧混凝土界面结合强度的影响。运用拉拔强度评价新旧混凝土界面结合状态，并借助显微硬度仪测量界面处的显微硬度值对试验结果进行了验证和分析。结果表明，在界面处于不同的干湿状态时，提高新混凝土的强度可使结合强度略有增大。在修补材料中掺入纤维会明显提高界面结合强度，且聚丙烯纤维要优于碳纤维．使用界面剂后界面干湿程度对界面结合强度影响减小。     

西南地区低温过程特征及与MJO指数的关系

本文选取1979年~2008年西南地区76个台站的逐日最低气温和MJO指数资料,采用累积频率法和线性倾向估计,研究了单站和区域持续性低温过程的变化特征及其与MJO指数的关系。     

聚乙烯亚胺为主链的液晶高分子研究进展

综述了近几年以聚乙烯亚胺(PEI)为主链的液晶高分子的研究进展.从PEI型液晶高分子的原理、结构和性能方面着手,展望了几类新型PEI液晶高分子的发展趋势.     

相变换热器应用于电站锅炉的探讨

阐述了复合相变换热器是一种新型的换热器,可以控制低温受热面金属不发生低温腐蚀,降低烟气的排放温度,该技术可用于各种燃煤、燃油、燃气锅炉、窑炉、注气炉、加热炉等换热设备,目前复合相变换热器应用于工业锅炉和循环流化床已有不少成功案例[1-3],而应用于大型电站锅炉还很少有报道,结合某330 MW电站锅炉尾部加装复合相变换热器的运行情况,对复合相变换热器应用于电站锅炉的运行情况及优缺点做了简要探讨。     

AFRP筋混凝土粘结强度和锚固长度的试验研究

通过对27个拉拔试件和16个梁式试件的试验,探讨AFRP筋与混凝土的粘结滑移关系、粘结强度,并且综合分析其他文献的结果,提出简化的局部粘结滑移本构关系和拔出破坏模式下锚固长度的计算公式。     

基于LTCC带传输零点的带通滤波器

采用低温共烧陶瓷（LTCC）技术设计了带传输零点的带通滤波器,利用三维叠层结构实现了滤波器的小型化设计,借助HFSS仿真软件对滤波器参数进行优化仿真,改善了滤波器的传输特性,有效压缩了本振信号,满足了该带通滤波器设计指标和小型化的目的。     

Strong Hydrogen Bonds in Acetylenedicarboxylic Acid Dihydrate

Acetylenedicarboxylic acid dihydrate (ADAD) represents a complex with strong hydrogen bonding between the carboxylic OH and the water molecule. An X-ray re-examination of the ADAD crystal structure confirms the O^…O distance of the short hydrogen bonds, and clearly shows different bond lengths between the two oxygen atoms with respect to the carbon atom in the carboxyl group, indicating a neutral structure for the complex. The neutral structure was also confirmed by vibrational spectroscopy, as no proton transfer was observed. The diffraction studies also revealed two polymorph modifications: room temperature (α) and low temperature (β), with a phase transition at approximately 4.9 °C. The calculated vibrational spectra are in satisfactory agreement with the experimental spectra. A comparison of the structure and the vibrational spectra between the ADAD and the oxalic acid dihydrate reveals some interesting details. The crystal structures of both crystal hydrates are almost identical; only the O^…O distances of the strongest hydrogen bonds differ by 0.08 Å. Although it was expected that a larger O^…O spacing in the ADAD crystal may significantly change the infrared and Raman spectra, especially for the frequency and the shape of the acidic OH stretching vibration, both the shape and frequency are almost identical, with all subpeaks topped on the broad OH stretching vibration. The O^…O distance dependent are only in- and out-of-plane OH deformations modes. The presence of polarons due to the ionized defects was not observed in the vibrational spectra of ADAD. Therefore, the origin of the broad OH band shape was explained in a similar way to the acid dimers. The anharmonicity of a potential enhances the coupling of the OH stretching with the low-frequency hydrogen bond stretching, which, in addition to the Fermi resonance, structures the band shape of the OH stretching. The fine structure found as a superposition of a broad OH stretching is attributed to Davydov coupling.