FRP—PVC混凝土柱的力学性能

在线性Mohr—Coulomb强度理论的基础上,分析FRP—PVC混凝土轴压短柱的工作机理,提出其极限承载力计算时的基本假定,利用极限平衡法推导了PVC-混凝土轴压短柱的极限承载力公式;在PVC-混凝土轴压短柱极限承载力公式的基础上,拟合FRP条带对承载力的贡献,得到FRP—PVC混凝土轴压短柱的极限承载力公式。将本文的计算结果与文献试验结果进行比较,验证了理论公式的正确性。该结果为FRP—PVC混凝土轴压短柱的极限承载力分析提供了一定的理论依据,对实际工程设计有一定的参考价值。     

物联网在新一代移动通信系统下的应用

对物联网的组成及研究进行了详细的分析,并且就物联网在新一代移动通讯系统下的应用进行了阐述。     

优化GM(1,1)模型在滑坡形变预测预报中的应用研究

传统的GM(1,1)模型,只适用于等间距监测数据序列的模拟预测,对非等间距监测序列,一般经过等间距处理或经过复杂的变换计算再建立非等间距模型。针对传统GM(1,1)模型的不足,本文探讨了几种合理且实用的改进GM(1,1)预测模型,并对各种优化GM(1,1)模型和传统GM(1,1)模型的预测结果进行了系统的对比分析。     

叠合连续梁的内力重分布计算方法

对叠合连续梁内力重分布分析，采用“弯矩调幅法”，对实验数据分析和理论计算，提出了叠合连续梁在集中荷载作用下的弯矩调幅值和弯矩的计算公式，为实际工程提供了依据。     

轻骨料混凝土单轴受力下的塑性损伤模型应用研究

依据轻骨料混凝土单轴全应力-应变关系曲线,获得轻骨料混凝土损伤塑性模型的单轴应力-非弹性应变关系、单轴应力-开裂应变关系、损伤值-非弹性应变关系与损伤值-开裂应变关系,利用数值方法模拟轻骨料混凝土单轴压缩试验,结果表明,采用损伤塑性模型获得的有限元计算模拟值与试验拟合值吻合较好。     

武汉市民之家大跨连体结构设计

武汉市民之家属大跨连体复杂高层结构。介绍本工程主要采取的构造措施和计算手段,包括塔楼筒体的抗倾覆验算、连体桁架与筒体的连接节点设计、连体层楼板的设计。分析了扭转位移比指标的特点,由于连体层上下结构层长宽比的变化,导致扭转位移比的突变,这种不规则性属于连体结构的固有特点,通过对塔楼部分的加强能保证结构整体在大震作用下的安全性。通过公式推导,得出结构整体抗倾覆系数与基底零应力区之间的联系。     

果子沟斜拉桥塔梁张拉的变形及施工测量问题

对新疆伊犁自治州果子沟斜拉桥Z2#主塔施工中针对主塔进行塔梁异步施工的特点,将施工中的测量监控与测量放样结合起来,从而改进工作流程,提高工作效率,确保主塔施工精度。     

A new multi-scale 3D-GIS-approach for the assessment and dissemination of solar income of digital city models

In order to support an effective planning of solar panel constructions or passive energy measures, information of potential solar income has to consider multiple levels of scale and detail. It has to consider the regional and the detailed household scale. Recent developments in the field of digital city models and 3D GIS allow combining the advantages of both domains. We present a multi-scale 3D GIS approach for the assessment and dissemination of solar income of a digital city model. For the consideration of long and close range shadows, we combine polygonal geometries, 3D-voxel grids and 2.5D Digital Elevation Models of different resolutions in a multi-scale modelling scene. In order to allow a realistic assessment of the heterogeneous 3D shadowing patterns in urban environments, we present a texture mapping approach for homogeneous surface sampling and efficient data storage. The approach integrates the regional topographic context with detailed 3D assessments on a household scale. In order to show the capabilities of the presented approach, a performance test using different scene compilations was conducted. Comparing the performance of different geometrical representations of a city model tile in terms of computational effort and accuracy of the results, the relevance of high spatial resolutions and the consideration of full 3-dimensionality of the presented modelling approach is proven. The results are compatible to current 3D standards such as CityGML and COLLADA facilitating the dissemination of results to non-expert addressees.     

A numerical study of film condensation on a metallic foam-sintered plate with considering convection and super-cooling effects

A numerical solution was presented for film condensation on a vertical plate sintered with metallic foam. In the metallic foam region, the Brinkman-Darcy model was employed to establish the fluid flow equation, and the thermal equilibrium model was used to describe local heat transfer. Through introduction of dimensionless distance, namely, the ratio of the coordinate normal to the plate and the local film thickness, the computational domain was regularized in a rectangular zone. The effects of convection and explicit heat of super-cooled liquid on the condensation film were considered. The temperature and velocity profile, film thickness, and the local and average Nu number were obtained. The effects of Ja and Da number on the velocity profile and heat transfer performance were investigated. The numerical model was verified through comparison of the predicted results with those in the literature, which neglected convection and explicit heat of super-cooling effects. Convection and explicit heat of super-cooling can play a positive role in reducing the velocity level in the film. The two effects played a positive role in heat transfer improvement when the dimensionless location along the gravity direction (X) was > 0.15, which was associated with reduced film thickness. The two effects also had a mild influence on the linear distribution of dimensionless temperature. The heat transfer performance deteriorated with an increase in Ja number or Da number.     

Parents’ mental associations with ultra-processed products for their infant children: Insights to improve complementary feeding practices

Increasing consumption of ultra-processed products from early age has raised growing concerns. In this context, the aims of the present work were: i) to explore the automatic mental associations raised by packages of ultra-processed products among parents of children under 12 months of age, ii) to estimate the valence of the affective reactions elicited by ultra-processed products, and iii) to explore the influence of socio-demographic variables and feeding styles on the valence of parents' associations with ultra-processed products. A total of 419 parents of children under 12 months of age were recruited at 20 health facilities that offer well-child services, selected using probability proportional to size sampling based on the number of births at each institution. Participants were presented with the labels of six ultra-processed products (corn snack, frankfurters, milk dessert, orange juice, wafer cookies, yogurt) and were asked to indicate the first words that came to their mind. The products raised mixed mental associations, which were mainly related to pleasure and health. Responses from the majority of participants (61–82%) evidenced negative associations with corn snacks, frankfurters and wafer cookies, whereas responses from 35 to 45% of the participants suggested a positive affective reaction towards orange juice, milk dessert and yogurt. Likelihood of having a positive affective reaction towards the evaluated ultra-processed products was higher for parents of 1 to 4 months infants, as well as those from low educational level and low socio-economic status. In addition, beliefs about three feeding practices (restriction on diet quality, indulgence in screen use and pressure for finishing) significantly influenced the valence of the associations. Results from the present work suggest the need to implement regulatory measures to reduce positive associations with ultra-processed products among parents and contribute to reduce their consumption among infants.