شاخص سطح برگ استخراج‌شده (LAI) از تصاویر سنجش دور پارامتر مهمی، به‌منظور مدل‌سازی مکانی تولید پوشش گیاهی، محسوب می‌شود. معمولاً شاخص‌های گیاهی که با بازتاب طول موج‌های قرمز و مادون نزدیک محاسبه می‌شوند، در برآورد LAI استفاده روش‌های آماری، به‌کار می‌روند اما بسیاری این شاخص‌ها مقادیر متفاوت به اشباع می‌رسند. برای رفع محدودیت، محدودة لبة شده است؛ بنابراین، باید قابلیت داده‌های دور، ذرت علوفه‌ای، ...

Carriage of Helicobacter pylori strains producing more active (s1/i1) forms of VacA is strongly associated with gastric adenocarcinoma. To our knowledge, we are the first to determine effects of different polymorphic forms of VacA on inflammation and metaplasia in the mouse stomach. Bacteria producing the less active s2/i2 form of VacA colonized mice more efficiently than mutants null for VacA ...

A common issue in forest management is related to yield projection for stands at young ages. This study aimed evaluate the Clutter model and artificial neural networks projecting eucalypt production from early ages, using different data arrangements. In order do this, changes number of measurement intervals used as input (ANNs) are tested. The was fitted considering two sets data: usual, with i...

where we use the notation dxI for (1.4) dxI = dxi1 ∧ dxi2 ∧ ... ∧ dxik for I = {i1, i2, ..., ik} with i1 < i2 < ... < ik. So ΩX is a free module over C ∞(X) generated by dxI . Obviously, Ω k X = 0 for k > n and ⊕ΩX is a graded ring (noncommutative without multiplicative identity) with multiplication defined by the wedge product (1.5) ∧ : (ω1, ω2)→ ω1 ∧ ω2. Note that (1.6) ω1 ∧ ω2 = (−1)12ω2 ∧ ω...

The imidazoline system (a concept which is barely over decades old) consists in imidazoline receptors I, I2 and I3 and their active endogenous ligands, the most important of which is agmatine. Brain contains both I1 and 12 of imidazoline receptors. One of the most important functions of this system is modulation of different behaviour components, such as suicidal behaviour, stress, anxiety, foo...

In this paper color image segmentation is accomplished using MRF model. The problem is formulated as a pixel labeling and the true labels are modeled as the MRF model. The observed color image is assumed to be the degraded version of the true labels. We assume the degradation to be Gaussian distribution. The label estimates are obtained by using Bayesian framework and MAP criterion. The (I1, I2...

Let G be a finite abelian group and F a field such that char(F) 6 | |G|. Denote by FG the group algebra of G over F. A (semisimple) abelian code is an ideal of FG. Two codes I1 and I2 of FG are G-equivalent if there exists an automorphism ψ of G whose linear extension to FG maps I1 onto I2. In this paper we give a necessary and sufficient condition for minimal abelian codes to be G-equivalent a...

In this paper we prove identities involving the classical Jacobi theta functions of the form ∑c(i1, i2, i3, i4)θ1(z|τ)1 θ2(z|τ)2 θ3(z|τ)3 θ4(z|τ)4 = 0 with c(i1, i2, i3, i4) ∈ K[Θ], where K is a computable field and Θ := { θ 1 (0|τ) : k ∈ N } ∪ { θ j (0|τ) : k ∈ N and j = 2,3,4 } . We give two algorithms that solve this problem. The second algorithm is simpler and works in a restricted input cl...