兰博基尼范儿的家具

二十年之前,当马丁·梅尔在超市中看到当红的Samantha Fox(80年代英伦当红歌手、演员、模特)和兰博基尼的康塔什海报时,他毫不犹豫地选择了后者,我一直狂迷于类似康塔什这样的纯种超跑,对于我来说康塔什已经不是一个简简单单的机械产     

未来导航员

作为建筑师、设计师及企业家。巴克明斯特·福勒(BuckminsterFuller)是一个高瞻远瞩的人。他从1930年代开始,不仅设计出了宏伟的穹顶建筑,还希望能创造一个新的世界。在可回收材料和环境保护意识方面,他走在时代的前端。最大限度能源利用车(Dymaxion-Car)就是他设计的一种环保车型。他将地球看作是一个由人类驾驶,在银河中飞行的航天飞船。他知道,只有人类与大自然和谐相处才能免于灭顶之灾。但福勒的意思并非要人们拒绝现代生活方式带来的舒适与安逸,虽然这种生活同时也会伴有环境污染等问题。     

Initial results from long-term measurements of atmospheric humidity and related parameters in the marine boundary layer at two locations in the Gulf of Mexico

Measurements of boundary layer moisture have been acquired from Rotronic MP-100 sensors deployed on two NDBC buoys in the northern Gulf of Mexico from June through November 1993. For one sensor, which was retrieved approximately 8 months after deployment, the post- and precalibrations agreed closely and fell well within WMO specifications for accuracy. The second sensor operated continuously from June 1993 to February 1997 (3.5 years). Buoy observations of relative humidity and supporting data were used to calculate specific humidity and the surface fluxes of latent and sensible heat. Specific humidities from the buoys were compared with observations of moisture obtained from nearby ship reports, and the correlations were generally high (0.7–0.9). Surface gravity wave spectra were also acquired. The time series of specific humidity and the other buoy parameters revealed three primary scales of variability, small (h), synoptic (days), and seasonal (months). The synoptic variability was clearly dominant and occurred primarily during September, October, and November. Most of the synoptic variability was due to frontal systems that dropped down into the Gulf of Mexico from the continental US followed by air masses which were cold and dry. Cross-correlation analyses of the buoy data indicated that: (1) the moisture field was highly coherent over distances of 800 km or more in the northern Gulf of Mexico; and (2) both specific humidity and air temperature served as tracers of the motion associated with propagating atmospheric disturbances. These correlation analyses also revealed that the prevailing weather systems generally entered the buoy domain from the South prior to September, but primarily from the North thereafter. Spectra of the various buoy parameters indicated strong diurnal and semidiurnal variability for barometric pressure and sea surface temperature (SST) and lesser variability for air temperature, wind speed and significant wave height. The surface fluxes of latent and sensible heat were dominated by the synoptic events which took place from September through November with the transfer of latent heat being primarily from the ocean to the atmosphere. Finally, an analysis of the surface wave observations from each buoy, which included calculations of wave age and estimates of surface roughness, indicate that major heat and moisture flux events coincide with periods of active wave growth, although the data were insufficient to identify any causal relationships.     

A theory of coupled beams for strength assessment of passenger ships

This paper describes a coupled beam method, which estimates elastic response in the longitudinal bending of a passenger ship with a large multi-deck superstructure. The method can be applied during an early project stage, when detailed three-dimensional finite element modelling is not yet possible. The theory is based on the assumption that each deck in the superstructure and also the main hull can be considered as a thin-walled beam. These beams are coupled to adjacent beams with springs modelling vertical and shear stiffness. The shear effect in the side and deck structures is included with options for large openings. As a result, the method allows for the calculation of the normal stresses and vertical deflections in the arbitrary location of the hull girder. Average longitudinal displacements of deck structures and shear stresses in the side structures can be estimated as well. Simplified structures were analysed in order to validate the coupled beam method against the three-dimensional finite element method.     

汽车底盘系统零件的振动性能优化技术

汽车振动性能的优化要求对悬架系统的单个零件进行分析,同时考虑它们在振动系统中的相互作用。这一工作的最大挑战在于如何建立简单有效的动力学模型,以便获得用于对零件的性能要求进行详细定义的足够数据。