sediments are generally regarded as the sink for dissolved elements carried out to the sea by rivers. in order to study the source and mechanism of metal transport in sea water, 123 surface sediment samples were taken by using grab sampler in the northwest part of the persian gulf in summer. grain size analysis and geochemical analysis by icp-oes were carried out on samples after sample prepara...

The publisher regrets that in the printed version of the above article, Fig. 1 contained errors. The figure is therefore reproduced in the correct format below. The publisher would like to apologise to the authors and readers of the journal for any inconvenience caused. Fig. 1. Mean accommodative lags for myopes (red bar) and emmetropes (green bar) tested in the lens-induced condition (a) and t...

Winter wheat seedtime is important for wheat growth. It affects the wheat yield and quality. The objective of this study is monitoring the winter wheat seedtime through remote sensing imagery. Two HJ-1B images and one Landsat5 TM image were used in this study. Three Vegetation Indices, DVI, SAVI and RDVI were calculated. The correlation about the wheat seedtime and VIs were analyzed. The result...

Recently published research has identified that the use of a ‘wine-like’ 15% ethanol extraction method when analysing grape tannins provides a strong indication of tannin concentration that is likely to result when those grapes are made into wine. The AWRI has developed a rapid and practical method for determining extractable tannins in red grapes, which involves gentle crushing of grapes by ha...

Apple scab causes significant losses in the production of this fruit. A timely and more site-specific monitoring and spraying of the disease could reduce the number of applications of fungicides in the fruit industry. The aim of this leaf-scale study therefore lies in the early detection of apple scab infections in a non-invasive and non-destructive way. In order to attain this objective, fluor...

Let us start with the well-known graph theorem of Turán that determines the largest number of edges in a graph on n vertices containing no complete graph on k + 1 vertices. If 1 ≤ k ≤ n are integers, define the graph T (n, k) whose vertex set is V1 ∪ V2 ∪ . . . ∪ Vk where the Vis are pairwise disjoint and their sizes are either ⌊ n k ⌋ or ⌈ n k ⌉ and two vertices are adjacent if and only if the...

This paper presents a novel method for computing visibility in 2.5D environments based on a novel theoretical result: the visibility from a region can be conservatively estimated by computing the visibility from a point using appropriately “shrunk” occluders and occludees. We show how approximate, yet conservative, shrunk objects can be efficiently computed in an urban environment. The techniqu...