力学性能不均匀性对焊接接头三点弯曲试样塑性区发展规律的影响

利用弹塑性有限元方法对焊接接头试样在三点弯曲试验中塑性区的发展情况进行了计算。分析了不同的裂纹深度、强度组配，焊缝宽度以及不同位置裂纹的焊接接头试样对塑性区形状发展的影响规律。分析结果显示，不同强度组配和几何特征的焊接接头试样对裂纹尖端塑性区的发展规律有较大的影响，由于裂纹尖端拘束程度的不同会造成塑性区的形状和尺寸的改变，因此在做焊接接头试样三点弯曲试验时，可能会得出与均质材料试样不同的驱动力曲线     

硫酸装置膨胀节选型方案的分析

本文对硫酸装置膨胀节选型问题进行了详细的技术方案讲座和技术经济比较，对存在的一些问题提出了建议和改进措施。     

Synthesis of novel pseudo‐Fréchet‐type dendrons and their fluorescent enhancement to Eu3+ ion

Novel pseudo‐Fréchet‐type dendrons with 1,3,5‐triazine structure G1.0(NOT) and G2.0(NOT) were synthesized under mild conditions by cyanuric chloride, β‐naphthol, and 3,5‐dihydroxybenzyl alcohol with the yields of 96.3 and 85.6%. The structure of the dendrons was characterized by elementary analysis, IR spectrum, ¹H‐NMR, and FAB‐MS. The dendrons had good thermo stability and solubility. They could partially transfer their absorbed energy to Eu³⁺ ion in tetrahydrofuran/acetone solutions. When the concentration of G1.0(NOT), G2.0(NOT), and Eu³⁺ ion was 5 × 10^?4 mol/L, G1.0(NOT) could enhance the fluorescent intensity of Eu³⁺ ion at 613 nm by 4.2‐fold, whereas G2.0(NOT) could enhance the fluorescent intensity of Eu³⁺ ion at 465 and 613 nm by 18.6‐ and 11.7‐fold, respectively. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Spatial characterization of joint planes and stability analysis of tunnel blocks

It has been gaining credence over the past several decades that the spatial characteristics of rock joints exert detrimental effect on the stability of tunnel structures. The deterministic joint spatial distribution around the tunnel was defined by digital photogrammetry technique, which statistically provides the basis for performing Monte-Carlo simulation of stochastic joints that are hidden inside the surrounding rock. The blocks generated by the intersection between structural planes and excavation surfaces were analyzed based on the block theory and limit equilibrium. The keyblocks were identified and the corresponding factors of safety were determined. All these analysis procedures were codified into the computer program GeoSMA-3D (Geotechnical Structure and Model Analysis). The developed software satisfied the fast analysis requirements of joint plane simulation, spatial block modelling, keyblock identification and failure process illustration. The case study was performed with reference to Dabeigou Tunnel on Duolun Second-class Highway in Duolun Town, Nei Mongol, China. Failure process illustration would be useful to facilitate the practical engineers to understand the basic mechanism and select the strengthening strategies.     

铅、银对活性碳分离富集-原子吸收法测金的干扰及消除

本文针对电鲜阳极泥、冰铜、铅、锌精矿、炉砖四种含金样品中铅银对活性碳富集－AAS测Au的干扰，提出了消除干扰的具体措施，提高了分析结果的准确性。     

上海科技馆单层网壳结构节点受力分析

采用ANSYS有限元分析程序对上海科技馆单层网壳结构典型节点进行了分析 ,通过对节点上的连接杆件、节点板、螺栓的受力分析 ,得出一些有意义的结论     

The analysis of the withdrawal force curve of the wetting curve using 63Sn-37Pb and 96.5Sn-3.5Ag eutectic solders

To analyze the withdrawal force curve in the wetting balance curve, wetting balance tests using the 63Sn-37Pb and 96.5Sn-3.6Ag eutectic solders were conducted by varying the immersion speed, sample perimeter, and solder temperature. The mechanism of the withdrawal force curve was reviewed and a new method for calculating the surface tension of solders using the withdrawal force curve was introduced. The results showed that the maximum point of the withdrawal force curve is generated when the sliding solder meets the bottom corners of a sample and the contact angle is reduced to zero. The maximum withdrawal force subtracted by end force can be expressed using force balance equation as F=pγ. Therefore, the surface tension of the solder can be calculated by dividing the maximum withdrawal force by the sample parameter.     

Design and preparation of Zn-based materials possessing both high damping and good mechanical properties

1　ＩＮＴＲＯＤＵＣＴＩＯＮＡｍｅｃｈａｎｉｃａｌｓｔｒｕｃｔｕｒｅｗｉｌｌｖｉｂｒａｔｅａｎｄｍａｋｅｎｏｉｓｙｗｈｅｎｉｔｉｓｅｘｃｉｔｅｄ .Ｔｈｉｓｎｏｔｏｎｌｙａｆｆｅｃｔｓｔｈｅｐｒｅｃｉｓｉｏｎａｎｄｌｉｆｅｏｆｔｈｅｍａｃｈｉｎｅ ,ｂｕｔａｌｓｏｈａｒｍｓｐｅｏ ｐｌｅ’ｓｈｅａｔｈ .Ｉｔｉｓａｖｅｒｙｅｆｆｉｃｉｅｎｔｍｅｔｈｏｄｔｏｕｓｅｍａｔｅ ｒｉａｌｓｐｏｓｓｅｓｓｉｎｇｂｏｔｈｈｉｇｈｄａｍｐｉｎｇａｎｄｇｏｏｄｍｅｃｈａｎｉ ｃａｌｐｒｏｐｅｒｔｉｅｓ ,ｗｈｉｃｈａｒｅｃ…     

炭基锌锰铜煤气脱硫剂的硫化行为研究

对锌、锰、铜摹单金属和复合金属氧化物脱硫剂的脱硫性能进行了讨论,并对炭材料作为脱硫剂和载体的研究现状进行了分析,同时对活化半焦作为脱硫剂载体的可行性进行了探讨.认为复合金属氧化物脱硫剂能够发挥单氧化物的优势,并克服其不足.将复合金属氧化物负载于炭材料上,可提高金属氧化物活性组分的利用率,改善脱硫剂的硫化性能,同时降低脱硫剂成本,使炭基锌锰铜复合金属氧化物煤气脱硫剂具有广阔的应用前景.     

钢管结构圆主管与方支管相贯节点的分析研究

结合实际工程，对钢结构规范中没有规定的圆主管和方支管的相贯节点算法，提出了一些思路及处理方法，指出可采用规范的等效算法，对设计承载力乘以折减系数，并通过在节点处增设加劲肋来解决应力集中现象。