determination of the relationships between soil and plant cover indispensible in the in planning and managementof the arid regions, the aim being to revitalize plant cover, conserve soil and to combat desertification. among factorsaffecting plant cover, particularly in arid and semiarid areas are soil traits. during the present study, the effect ofhaloxylon aphyllum cultivation on soil physioch...

Fe films in the 0.4<u<4.7 ML ~monolayer! coverage range were deposited on a Mo~110! substrate at temperatures between 300 K and 700 K, under ultrahigh vacuum conditions. The adsorption of CO, CO2 , H2O, and O2 onto these films from the residual gas within the Ultrahigh vacuum system has been studied using scanning tunneling microscopy, low-energy electron diffraction, and Auger electron spectro...

In this paper, we propose an MPEG-7 based video metadata model that supports personalization and recommendation in video-based services. This is achieved through the provision of adequate video retrieval support that includes video retrieval based on video content, video structure and/or video attributes, as well as video retrieval based on the relationships within videos, among videos and betw...

The re-oxidation of slightly reduced TiO2(110) surfaces by exposure to an oxygen pressure of∼ 2× 10−7 mbar in the temperature range 473–1000 K occurs by re-growth of TiO2 overlayers by diffusion of Tin+ interstitials from the bulk. Starting with a (1 × 2) reconstructed surface, scanning tunnelling microscope images of the surface reacting under these conditions show that the (1×1) islands nucle...

Using existing heat transfer data, a relatively simple expression was developed for estimating the effective thickness of the boundary layer of air surrounding cylinders. For wind velocities from 10 to 1000 cm/second, the calculated boundary-layer thickness agreed with that determined for water vapor diffusion from a moistened cylindrical surface 2 cm in diameter. It correctly predicted the res...

We calculate properties of a model of 4He in Vycor using the path integral Monte Carlo method. We find that 4He forms a distinct layered structure with a highly localized first layer, a disordered second layer with some atoms delocalized and able to give rise to the observed superfluid response, and higher layers of nearly perfect crystals. The addition of a single 3He atom was enough to bring ...

We consider a hierarchical two-layer model of natural signals in which both layers are learned from the data. Estimation is accomplished by score matching, a recently proposed estimation principle for energy-based models. If the first-layer outputs are squared and the second-layer weights are constrained to be nonnegative, the model learns responses similar to complex cells in primary visual co...

Previous work (M.I. Sereno, 1989; cf. M.E. Sereno, 1987) showed that a feedforward network with area V1-like input-layer units and a Hebb rule can develop area MT-like second layer units that solve the aperture problem for pattern motion. The present study extends this earlier work to more complex motions. Saito et al. (1986) showed that neurons with large receptive fields in macaque visual are...