Performance of a simplified Quad Tiltrotor (QTR) is studied in ground effect using CFD. The rotor systems are modeled in a time averaged sense using source terms for the forces in the momentum equations. Viscous body conforming overset meshes are used to model all the solid surfaces of the vehicle. The background Cartesian grid is used to specify the far-field boundary conditions and transfer i...

Climate change may impact forest management activities with important implications for forest ecosystems. However, most climate change research on forests has focused on climate-driven shifts in species ranges, forest carbon, and hydrology. To examine how climate change may alter timber harvesting and forest operations in north temperate forests, we asked: 1) How have winter conditions changed ...

The Interferometric Point Target Analysis (IPTA) technique and Advanced Synthetic Aperture Radar (ASAR) images acquired over Hong Kong from 2007-2008 were used to detect ground deformation in the urban area of Guangzhou city in South China. A ground deformation rate map with scattered distribution of point targets shows the maximum subsidence (rise) rate as high as -26 to -20 mma(-1) (16-21 mma...

Decidability/undecidability of properties in subclasses of conditional term rewriting systems (CTRSs, for short) of natural, join, and oriented types are studied. The properties focused are convertibility, reachability, joinability, con uence, and termination. In particular, it is shown that (1) all of the properties listed above are undecidable for left-linear right-ground CTRSs of each types ...

main perennial rivers of gujarat, tapi, narmada, mahi and sabarmatiare meeting arabian sea in gulf of khambhat. the out flow of mahi river intothe sea is decreased due to construction of dams like bajaj sagar, kadana, panamand wanakbori weir. so, tidal effect of sea and sea water intrusion is beingincreased on landward side. moreover, due to erratic nature of rainfall andimproper management of ...

This paper contains data and supporting information of and complementary to the research article entitled "Effect of jar shape on high-energy planetary ball milling efficiency: simulations and experiments" (Broseghini et al.,) [1]. Calcium fluoride (CaF2) was ground using two jars of different shape (cylindrical and half-moon) installed on a planetary ball-mill, exploring different operating co...

Double well problems appear to be among the easiest tunneling problems to analyze in a rigorous mathematical manner, in part because it is easier to give precise meaning to an eigenvalue splitting than to a lifetime. The first mathematically rigorous treatment of the precise leading order behavior in a tunneling problem is Harrell’s analysis [ 31 of one dimensional double wells. More recently, ...