板式托换法在逆作法技术中的应用

在逆作法施工中采用板式托换法,可利用拟建地下室的部分顶板和底板作为托换构件承担上部荷载,起到临时基础的作用,以施工地下室的竖向构件。技术要点是控制板下土体沉降量和稳定性以及板式托换基础工法的构件设计。工程实例表明,该方法可省去灌注桩和中间支撑柱的成本,降低工程造价。     

斯托克曼商业中心土胎模冬期施工技术

圣彼得堡斯托克曼商业中心在冬期逆作施工中采用土胎模技术.在实际施工过程中,采用电阻丝对楼板混凝土进行加热,保温被覆盖、保温棚保温,以满足混凝土浇筑条件,并为后续混凝土养护提供条件,混凝土浇筑后养护时及时测温.通过计算混凝土水化热确定最终黏土温度.指出土胎模冬期施工工艺及注意事项.地下1层开挖完成后,采用土胎模法完成的混凝土顶板符合设计及当地规范要求.     

Bottom-up guidance in visual search for conjunctions.

Understanding the relative role of top-down and bottom-up guidance is crucial for models of visual search. Previous studies have addressed the role of top-down and bottom-up processes in search for a conjunction of features but with inconsistent results. Here, the author used an attentional capture method to address the role of top-down and bottom-up processes in conjunction search. The role of bottom-up processing was assayed by inclusion of an irrelevant-size singleton in a search for a conjunction of color and orientation. One object was uniquely larger on each trial, with chance probability of coinciding with the target; thus, the irrelevant feature of size was not predictive of the target's location. Participants searched more efficiently for the target when it was also the size singleton, and they searched less efficiently for the target when a nontarget was the size singleton. Although a conjunction target cannot be detected on the basis of bottom-up processing alone, participants used search strategies that relied significantly on bottom-up guidance in finding the target, resulting in interference from the irrelevant-size singleton. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Top-down-driven grouping overrules the central attentional bias.

A central bias in spatial selection has been proposed to explain the decreasing search efficiency with increasing target eccentricity that results when distractors can occur closer to fixation than the target (J. M. Wolfe, P. O'Neill, & S. C. Bennett, 1998). The authors found evidence for such a bias using an odd-man-out variant of conjunction search. However, the bias was absent for the same displays when the identity of the odd-man-out target was known in advance. The authors propose that (a) top-down knowledge of a target feature supports grouping on this feature and (b) grouping links a peripheral target to central distractors expressing the same feature, increasing the attentional weighting afforded to the target and, consequently, facilitating its detection. The effects are independent of bottom-up priming effects occurring across trials. Thus, feature-based grouping can be driven top-down and can overrule the central bias in spatial selection. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

杭州凯悦大酒店逆作法设计与分析

介绍了杭州凯悦大酒店地下工程逆作法及围护设计的设计要点 ,结合该实际工程已有的监测资料 ,对逆作法施工过程中地下墙的侧向位移、墙身应力、墙背水土压力及基坑周围地表沉降等进行了分析研究和总结 ,可供同类工程参考。     

Task-irrelevant angry faces capture attention in visual search while modulated by resources.

We investigated the attentional capture effect of emotional faces under sufficient or restricted attentional conditions. In a modified visual search paradigm, three kinds of schematic faces (angry, happy, and neutral) served as stimuli. Participants were instructed to search for a target face indicated by a dot and to respond to the dot's position. In this design, the emotional content of the face is task-irrelevant and does not need to be attended. The results of Experiment 1 demonstrate that having an angry face as the target face elicited a faster response than did the neutral target face, and when the angry face is used as a distractor, the response to the target was delayed compared to the response with no such distractor. Experiment 2 included inverted faces to decrease emotional content; results showed that inversion of the faces reduced the effect of angry faces on the search performance. When attention was cued to a specific area in Experiment 3, the effect of angry faces outside of the cued area became weaker. In conclusion, the results indicate that a task-irrelevant angry face can capture attention beyond top-down control, but this effect is modulated by the availability of attentional resources. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

基于SolidWorks的侧翻拍门自上而下设计与应用

经典的自下而上的产品设计过程类似于产品的制造过程,不适于对产品进行设计,对比分析自下而上和自上而下2种设计方法,通过在SolidWorks中使用自上而下的设计方法对侧翻拍门进行设计,达到缩短设计同期,提高设计质量的目的。     

盖挖逆作法超深基坑绿色施工评价分析

在低碳经济时代,城市地下空间的开发应是低碳施工技术的开发.为合理利用绿色施工技术开发城市地下空间,以天津某一采用盖挖逆作法的工程为例,并根据现场监测数据和ABAQUS模拟数据综合分析盖挖逆作法在超深基坑支护中的绿色效应,提出了地下工程绿色施工评价的几点建议.得出采用盖挖逆作法支护形式基坑本身变形小,对周边环境影响也小,...     

TOP-DOWN在手机产品设计中的应用

在Pro/E产品设计中,TOP-DOWN设计方法适合产品的设计流程,应用越来越广。以设计步步高无绳电话机为例,详细阐述了TOP-DOWN在手机产品设计中的应用。TOP-DOWN设计方法符合产品生命流程,在产品设计变更中非常方便,因此,应用范围越来越广。     

法兰吊具的PRO/E设计仿真与有限元分析

利用PRO/E软件自顶向下设计了法兰吊具,进行了三维设计建模,并使用了SIMULATE功能仿真模拟了法兰吊具的自由状态和吊装状态,分析了最小和最大吊装尺寸,有限元分析了满载时的变形量,该方案三爪自定心,且为联动机构,夹紧后由于工件重力而自锁,不会意外掉落,减少了安全隐患,分析了受力及变形,为其他的吊具设计提供了借鉴。