Effect of Initial Frequency Chirp on Supercontinuum Generation in Dispersion-flattened Fibers

. Supercontinuum generation in dispersion-flattened fibers is studied theoretically. It is found that the flat spectral width of the supercontinuum generation in normal dispersion-flattened fiber can be increased from 66 nm to over 100 nm when the absolute value of the initial frequency chirps is increased from zero to 10. It is further found that initial frequency chirps are adverse to flat and wideband supercontinuum generation in anomalous dispersion-flattened fiber, and when the absolute value of the frequency chirps is increased to a certain degree, supercontinuum spectrum even can not be achieved.     

Study on Integrated Thermal Cycle and Vibration Profile for HALT

Focusing on electronic products, this paper establishes a finite element model for printed circuit board （PCB） assembling with enhanced ball grid array（EBGA）component under vibration environment. Based on this model, it studies relations between fatigue rate of solder joint and temperature, vibration frequency. Moreover, it analyzes propagation of micro-crack produced by thermal cycle under vibration stress. The results offer a method to optimize the thermal cycle and vibration integrated profile and to combine vibration test and thermal cycling for highly accelerated life test （HALT）.     

面板坝接缝新型防护盖板止水结构试验

根据SK手刮聚脲强度高、延伸率大、耐老化及施工方便的特点,提出了面板接缝新型防护盖板止水结构.并对这种防护盖板止水结构进行了抗冻、耐久性及长期变形等试验,试验结果表明,其具有表面防护可靠、防渗效果及耐久性好、易于施工、经济效益显著等优势.在蒲石河抽水蓄能电站上库面板坝进行的现场试验,进一步证明了这种止水防护盖板结构的可靠性.     

铝合金铜元素数字化可见光谱分析技术研究

利用可见光谱数字化分析系统将铝合金中Cu元素Cu 510.55 nm分析谱线组谱图转变为数字化的电子谱图,使用计算机自动分析代替人眼视觉判断,解决谱图的量化分析和记录难题。对3种不同Cu元素含量的铝合金标准样品进行数字化分析测定,探索选用Cu 510.55 nm谱线和Fe 510.75 nm谱线分别作为分析谱线和比较谱线进行定量测定的方法,数据显示分析谱线和比较谱线的强度比值与Cu元素含量呈正比关系。研究数字化系统指导视场定位和谱线辨别的途径,降低可见光谱分析的技术难度并提高快速分析的可靠性。结果表明,数字化技术保持快速分析特点的同时可以达到定量分析目的,有效解决铝合金中Cu元素的快速定量分析及材料牌号鉴别问题。     

Y型圆钢管平面内转动刚度分析

通过建立Y型圆钢管节点有限元模型,对Y型圆钢管相贯节点转动刚度进行单参数分析,同时对整个节点转动刚度进行回归分析,得出Y型圆钢管转动刚度的计算公式。     

Enhancement of Single-Lap Composite Joints Strength at Different Temperatures

Abstract

In this study a novel reinforcing method was examined for glass-fiber reinforced composites consisted of inter-adherend glass fibers which acted as pins to pierce the composite adherend. Two types of interadherends were investigated. One of the types involved fibers which acted as pins (type B), and the other type was made up of pin like fibers with bent edges which stuck to the surface of the adherend (type C). Static tensile tests were performed on both types of single-lap joints (SLJ) and for joints without interadherend fibers (type A) at four different temperatures (20, 40, 60 and 80°C) in accordance with ASTM standards. The results showed that the fibers improved the ultimate static strength of the single-lap joints over the entire temperature range.     

菠菜中乐果农药残留的比色法测定条件研究

为研究菠菜中乐果农药残留的快速安全检测方法,根据乐果在碱性（NaOH）溶液中分解,生成物Na2S和亚硝酰铁氰化钠反应生成洋红色产物的原理,对比色条件进行了研究和优化.详细分析并验证了显色体系的配制方法,确定了显色体系的较佳参数值：pH值为5.7,温度为24℃,反应时间为20 s.实验结果表明,最佳比色条件下在390 nm处有明显的特征吸收峰,可以测定1×10-6的乐果农药残留.用最小二乘法建立了菠菜中乐果农药残留的数学模型,相关系数R2=0.941 5,样品回收率为91.6％～108.9％,为以后开发便携式农药残留检测仪器的光源提供了依据.     

核电站暖通系统仪表的抗震试验程序和方法

本文介绍了暖通系统的仪表抗震试验的试验目的、试验程序和实施方案及合格判定要求，分别从抗震仪表分类、试验步骤、试验方法和功能评价等方面进行阐述，为核电站仪表或设备的抗震试验提供一定的试验思路和借鉴指导。抗震鉴定试验表明，被试仪表具有足够的强度抵抗设计地震载荷，试验中及试验后被试仪表结构完整并且运行功能完好，满足暖通系统对此类仪表的抗震Ⅰ类的抗震要求。     

火花源原子发射光谱法在线测定电工钢中的超低碳

采用火花源原子发射光谱分析测定电工钢中超低C，研究试样制备方法、Ar纯度和压力等条件对分析结果的影响，并对工作曲线进行了优化，实现了一次分析同时测定电工钢的多种元素，满足炉前和精炼在线分析的要求。     

The ability of zinc to inhibit the sporulation and viability of Clostridium sporogenes and growth of other bacteria

The objective of this study was to investigate the influence of zinc on the sporulation and viability of Clostridium sporogenes and on the growth of other bacteria. When 0.5% ZnCl₂ was added to a sporulation medium, it completely inhibited C. sporogenes (PA 3679) sporulation for up to 3 weeks. At concentrations of 0.5% and 1.0%, ZnCl₂ not only completely inactivated the vegetative cell viability (>7.0 Log reduction) but also significantly reduced the spore viability (<2.1 Log reduction) of C. sporogenes. Taken together, it was concluded that zinc blocks C. sporogenes sporulation by damaging (or killing) vegetative cells and probably by interfering with the biosynthesis of spore components. In addition to the inhibitory effect on the sporulation and viability of C. sporogenes, ZnCl₂ was found to have a broad antimicrobial spectrum against all Gram‐positive and Gram‐negative spoilage and pathogenic bacteria tested. The minimal inhibitory concentration for inhibiting the bacteria ranged between 3.7 and 7.4 mm . Therefore, we expect that this compound or a combination thereof has a potential as a surface‐cleaning agent or disinfectant.