propene dissociation channels were characterized by ab initio ccsd(t)/6-311++g(d,p) calculations. inthis work the detailed mechanism of propene dissociation to c2h4+ch2, c2h2+h+ch3, c2h2+ch4 andc3h3+h2+h have been investigated. according to our calculations, ten fragments can be classified intofive dissociated channels. our results point out that two mechanisms come into play in the h2 eliminat...

conclusions there is a risk for constipation after abdominal surgery. postoperative practices are effective on the risk of constipation. objectives to determine constipation risk before the surgery, bowel elimination during postoperative period, and the factors affecting bowel elimination. patients and methods this is a cross-sectional study. it was conducted in a general surgery ward of a univ...

potato virus y (pvy) and potato leafroll virus (plrv) are two major viruses which reduce 10-90 percent of yield and quality of potato tubers. in the present study, the efficiency of different methods, including meristem culture, thermotherapy followed by meristem culture and electerotherapy followed by meristem culture in two cultivars (agria and marfona) infected by plrv or pvy were evaluated....

The derivation of a Hardy field induces on its value group a certain function ψ. If a Hardy field extends the real field and is closed under powers, then its value group is also a vector space over R. Such “ordered vector spaces with ψ-function” are called H-couples. We define closed H-couples and show that every H-couple can be embedded into a closed one. The key fact is that closed H-couples ...

This paper proposes a robust visual Simultaneous Localization and Mapping(vSLAM) method that consists of two parts: (1)an initialization method for a 3D map and camera poses, and (2)an outlier rejection method for moving objects. We introduce weighted tentative initial values of a camera pose and 3-D map to reduce the user operation load. We also distinguish outliers of feature points between m...

background: asymptomatic malaria infection provides a reservoir of parasites, causing the persistence of malaria transmission. it accounts an important challenge for successful management of the control, elimination, and eradication programmes in any malaria-endemic region. this investigation was designed to assess the presence and the prevalence of asymptomatic carriers in iranshahr district o...

In an ordinary 2D image the critical points and the isophotes through the saddle points provide sufficient information for classifying the image into distinct regions belonging to the extrema (i.e. a collection of bright and dark blobs), together with their nesting due to the saddle isophotes. For scale space images, obtained by convolution of the image with a Gaussian filter at a continuous ra...

Exact closed-form expressions are obtained for the outage probability of maximal ratio combining in η − μ fading channels with antenna correlation and co-channel interference. The scenario considered in this work assumes the joint presence of background white Gaussian noise and independent Rayleigh-faded interferers with arbitrary powers. Outage probability results are obtained through an appro...

A stable test for checking if a matrix is a nonsingular M -matrix is presented. Its computational cost is, in the worst case, O(n2) elementary operations higher than the computational cost of Gaussian elimination. The test can be applied to check if a nonnegative matrix has spectral radius less than 1.