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Modern vehicles are required to comply with a range of environmental regulations limiting the level of emissions for various greenhouse gases, toxins and particulate matter. To ensure compliance, regulators test vehicles in controlled settings and empirically measure their emissions at the tailpipe. However, the black box nature of this testing and the standardization of its forms have created an...
UGNX second development technology is used to create the cyLindrical spur gear 3d parametric model. then menu and interface designed by UG/Open API, MenuScript menu and UIStyler dialog and control procedures, thus build intuitive gear database man-machine interface. In UG environment, the system will automatically generate fully comply with the design requirements of users gear models, when the gear...
Hydrological features are always important information for water resources computing. 3D (three-dimensional) GIS (Geographic Information System) technique provides a feature extracting and 3D scene displaying platform for management and decision. In our case study, contrasting and analyzing current three system development patterns, we have presented the 3D development tool and system architecture...
Generally traffic jams are grown from single spots such as intersections which have key positions in urban transportation, then the small jams came into bigger ones, until the whole region was stopped up. In order to measure the extent of traffic jams, it's necessary to define an index. Based on regression analysis on the data from 15 Intersections of 5 Beijing Districts, the Intersection Approach...
As part of the urban transportation, intersections belong to quasi-public goods. Individual vehicles will not affect others on the same intersection when traffic is smooth. But once the traffic flow exceeds the critical point, intersections' non-competitive character will disappear and exclusionary becomes conspicuous, showing all levels of traffic jams. This article first combines the transportation...
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