Reflectivity of the gyroid biophotonic crystals in the ventral wing scales of the Green Hairstreak butterfly,Callophrys rubi

We present a comparison of the computer simulation data of gyroid nanostructures with optical measurements (reflectivity spectra and scattering diagrams) of ventral wing scales of the Green Hairstreak butterfly, Callophrys rubi. We demonstrate that the omnidirectional green colour arises from the gyroid cuticular structure grown in the domains of different orientation. We also show that this three-dimensional structure, operating as a biophotonic crystal, gives rise to various polarization effects. We briefly discuss the possible biological utility of the green coloration and polarization effects.     

浮头换热器填料函的优化设计

根据实例介绍了对某可抽式浮头换热器填料函的改进方法,并进行结构优化设计,达到了方便维护检修,延长检修周期,大大降低成本的目的。     

A meta-analytic investigation of the structure of posttraumatic stress disorder symptoms.

Converging lines of evidence have called into question the validity of conceptualizations of posttraumatic stress disorder (PTSD) based on the Diagnostic and Statistical Manual of Mental Disorders (DSM; American Psychiatric Association, 2000) and suggested alternative structural models of PTSD symptomatology. We conducted a meta-analysis of 40 PTSD studies (N = 14,827 participants across studies) that used a DSM-based measure to assess PTSD severity. We aggregated correlation matrices across studies and then applied confirmatory factor analysis to the aggregated matrices to test the fit of competing models of PTSD symptomatology that have gained support in the literature. Results indicated that both prominent 4-factor models of PTSD symptomatology yielded good model fit across subsamples of studies; however, the model comprising Intrusions, Avoidance, Hyperarousal, and Dysphoria factors appeared to fit better across studies. Results also indicated that the best fitting models were not moderated by measure or sample type. Results are discussed in the context of structural models of PTSD and implications for the diagnostic nosology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Determination of Structural Characteristics of Stitched and Knitted Fabric

Abstract

The mechanical properties of stitched-bonded fabrics are investigated in the paper. The main structural characteristics of stitch-and-knitted nonwovens ric in two different density made on automatic warp knitting machine with compound needles and with one laying bar were calculated. Breaking strength of the fabric is determined by means of tensile tester with a constant speed of specimen deformation and at the ball burst test. The tensile test showed a 100% bigger breaking force in warp related to weft direction, while the breaking elongation is 50% greater in welt direction for both of samples. Results of this measurements were showed in diagram.     

高超声速飞行器的非概率可靠性分析

为探究高超声速飞行器整体结构可靠性及其可靠性的影响因素，确保飞行器执行任务时的结构安全，将应力-强度干涉模型与区间数相结合，提出了子域子区间新方法分析高超声速飞行器结构强度可靠性。首先，分析高超声速飞行器在不同飞行状态下各受力面的力矩；其次，将飞行器结构近似为等效悬臂梁，考虑其所受力矩、宽度和飞行高度的不确定性，并表示为区间数；然后，考虑飞行器结构强度随时间退化，基于应力-强度干涉模型进行非概率可靠性分析，建立飞行器结构动态可靠性模型；最后，提出子域子区间法分析结构强度的指数退化特性和飞行动态对结构可靠性的影响。仿真结果表明，子域子区间法相比于传统蒙特卡罗法，在相同采样点数情况下，精确度会更高，验证了所提方法的可行性和有效性；飞行器可靠性随着飞行器结构强度指数递减而逐渐减小；飞行器的飞行动态会对结构可靠性产生主要影响，其中随着飞行高度的升高飞行器可靠性会逐渐增加，随着速度以及迎角的增大而逐渐减小。     

大悬挑钢结构雨篷的设计与施工

通过某具体工程,运用3D3S结构分析软件对大悬挑雨篷的结构计算进行分析并对施工的主要步骤进行介绍。结果表明该雨篷设计及施工能够满足结构安全及使用功能的要求。     

Design sensitivities of fatigue performance and structural dynamic response in an automotive application

Direct accounting for durability rarely finds its way into multidisciplinary optimization. Though reduction of loads by some means can certainly have a beneficial influence on the fatigue performance of a structure, changes in load levels are not a direct measure of the influence of design changes on fatigue performance. In this paper, an assessment is made of an approach to the calculation of design sensitivities of a fatigue performance index namely, number of damaging cycles to failure. The approach makes use of analytical sensitivities of structural dynamic response, and a standard approach to the calculation of fatigue performance. The method is demonstrated using a simple nine degree-of-freedom structural model of an automobile in a conceptual representation of the industrial practice of road testing and road simulation. Results suggest that the estimates of changes in fatigue life are of sufficient quality for typical fatigue life evaluations, and open the door for the incorporation of a direct measure of fatigue performance in formal structural optimization. Received January 27, 2000 Communicated by J. Sobieski     

鲁南、苏北地区农村房屋结构通病及防治措施研究

文章针对鲁南及苏北地区农村房屋建筑中普遍存在的影响结构安全的一些做法，结合实际工程经验，从建设程序管理和结构设计角度提出具体的防治措施。     

纳米透明隔热涂料在建筑节能中的应用

介绍纳米透明隔热涂料对不同频谱阳光的透过具有选择性及其在建筑玻璃上的开发应用.它不但经济适用,而且节能环保,因而为建筑节能提供了一条新思路.     

厦门国际银行大厦结构设计

介绍了厦门国际银行大厦超高层建筑的结构计算和构造措施。该工程的特点是将核心筒偏置 ,提出了一些解决方法 ,可供低烈度区的高层建筑有使用要求时参考