内边群抱倒装法在某工程中的应用

主要叙述了某工程应用内边群抱吊装法进行现场组对储罐施工,并与几种常用的储罐施工方法进行比对,该方法所用吊装机具采购方便,制作简单,成本低,且可以重复利用;高空作业少,安全,质量易于保证;占地少,可在较狭小的空间施工,并且适用储罐类型广,从而得出内边群抱倒装法施工的适用性更强,技术、经济效果显著．     

油田自动化安全保护系统及PLC的应用

就油田自动化来讲，安全保护系统是确保自动化系统在安全条件下进行油田自动生产和管理的重要部分。油田自动化安全保护系统可以避免和限制由于工艺生产故障或其它一些事故所引起的损害，也可以保护操作人员，环境及工艺生产系统受到伤害和损害。     

The effect of cell phone type on drivers subjective workload during concurrent driving and conversing

The effect of three types of cell phones (hand held, hands free with an external speaker and personal hands free) on total subjective workload (including its constituent components; mental demand, physical demand, temporal demand, performance, effort and frustration) and intelligibility was measured using the NASA-task load index (TLX) and the modified rhyme test (MRT), respectively in 13 experienced drivers (nine male, four female, age range 28-65 years), whilst driving on a rural highway. The drivers rated all components of workload for each type of cell phone to be significantly higher than for a control condition in which no cell phone was used. The mean (standard deviation) total workload was lowest for the personal hands free cell phone (7.1(3.65)) and highest for the hands free speaker phone (10.8 (3.63)) (P<0.001). The mean (standard deviation) intelligibility score was highest for the personal hands free cell phone (74.1 (7.9)) and lowest for the hands free speaker phone (55.0 (10.4)) (P<0.001). Frustration was significantly correlated with total workload (0.60, P<0.001) and intelligibility was significantly correlated with frustration (-0.35, P<0.05). Physical demand was not a high contributor to total workload. It is concluded that a personal hands free cell phone would interfere least with the cognitive demands of driving.     

Provision and maintenance of presence and immersion in hand‐held virtual reality through motion based interaction

Hand‐held devices are also becoming computationally more powerful and being equipped with special sensors and non‐traditional displays for diverse applications aside from just making phone calls. As such, it raises the question of whether realizing virtual reality, providing a minimum level of immersion and presence, might be possible on a hand‐held device capable of only relatively “small” display. In this paper, we propose that motion based interaction can widen the perceived field of view (FOV) more than the actual physical FOV, and in turn, increase the sense of presence and immersion up to a level comparable to that of a desktop or projection display based VR systems. We have implemented a prototype hand‐held VR platform and conducted two experiments to verify our hypothesis. Our experimental study has revealed that when a motion based interaction was used, the FOV perceived by the user for the small hand held device was significantly greater than (around 50%) the actual. Other larger display platforms using the conventional button or mouse/keyboard interface did not exhibit such a phenomenon. In addition, the level of user felt presence in the hand‐held platform was higher than or comparable to those in VR platforms with larger displays. We hypothesize that this phenomenon is related to and analogous to the way the human vision system compensates for differences in acuity resolution in the eye/retina through the saccadic activity. The paper demonstrates the distinct possibility of realizing reasonable virtual reality even with devices with a small visual FOV and limited processing power. Copyright © 2010 John Wiley & Sons, Ltd.     

索托结构在屋盖结构中的应用

介绍一种新型结构形式———索托结构在屋盖结构设计中的具体应用。在无支塔且建筑空间有限的情况下 ,索托结构解决了桁架挠跨比过大的问题 ,并且改善了整体受力状态。索托结构拉索效率高、跨度大、用钢量少、施工方便、工程造价低 ,是一种适用范围广的大跨结构形式     

In Depth: Inscribing the Indian Landscape

When India was colonised by the British in the 18th and 19th centuries, it was systematically surveyed and delineated in map form for administrative and political purposes. Here, Anuradha Mathur and Dilip da Cunha urge a new, ‘deeper’ reading of the landscape that fully acknowledges the multiple uses and potential initiations of public spaces. Copyright © 2007 John Wiley & Sons, Ltd.     

An assessment of a frictional strain gauge probe for dynamic strain measurement

A probe for the measurement of surface strains on dynamically loaded structures has recently been tested at the National Engineering Laboratory (NEL). The procedure for estimating the amplitude of the conditioned signals from the frictional strain gauge attached to the probe is described and the usefulness of the technique is discussed. Calibration data are presented from comparative tests of the performance of the frictional gauge and bonded gauges on an axially loaded testpiece subjected to sinusoidal and random loading conditions.     

Design and test of a device for acceleration reproducibility of hand held olive harvesters

Hand held olive harvesters may cause severe HAV (Hand Arm Vibration) pathologies to the operators. The measured vibration data should be available to the end users in the instruction manual issued by the manufacturers, who should follow the procedures specified by a C type European standard.     

Chosen Striking Location and the User-Tool-Environment System.

Controlling a hand-held tool requires that the tool user bring the tool into contact with an environmental surface in a task-appropriate manner. This, in turn, requires applying muscular forces so as to overcome how the object resists being moved about its various axes. Perceived properties of hand-held objects tend to be constrained by inertial variables that describe such resistance to movement. In 3 experiments, the authors investigated whether participants choose different striking locations on striking implements when using that implement under different constraints. The results suggest that the constraints of the striking task and the grasp position on the striking implement together contribute to the chosen striking location. Furthermore, such choices are constrained by inertial variables that reflect combinations of these constraints. (PsycINFO Database Record (c) 2010 APA, all rights reserved)