نتایج جستجو برای: daviesbouldin index
تعداد نتایج: 396061 فیلتر نتایج به سال:
let $g$ be a non-abelian group. the non-commuting graph $gamma_g$ of $g$ is defined as the graph whose vertex set is the non-central elements of $g$ and two vertices are joined if and only if they do not commute.in this paper we study some properties of $gamma_g$ and introduce $n$-regular $ac$-groups. also we then obtain a formula for szeged index of $gamma_g$ in terms of $n$, $|z(g)|$ and $|g|...
let $g$ be a simple connected graph. the edge-wiener index $w_e(g)$ is the sum of all distances between edges in $g$, whereas the hyper edge-wiener index $ww_e(g)$ is defined as {footnotesize $w{w_e}(g) = {frac{1}{2}}{w_e}(g) + {frac{1}{2}} {w_e^{2}}(g)$}, where {footnotesize $ {w_e^{2}}(g)=sumlimits_{left{ {f,g} right}subseteq e(g)} {d_e^2(f,g)}$}. in this paper, we present explicit formula fo...
normal 0 false false false en-us x-none ar-sa background: the purpose of this study is to determine sensitivity and specificity of body mass index (bmi) based on center for disease control 2000 (cdc) percentiles compared to fat mass index (fmi) as an indicator of being really obese in children. obesity was compared based on these two indexes among children under study. materials and methods: th...
mathematical chemistry is a branch of theoretical chemistry for discussion and prediction of the molecular structure using mathematical methods without necessarily referring to quantum mechanics. in theoretical chemistry, distance-based molecular structure descriptors are used for modeling physical, pharmacologic, biological and other properties of chemical compounds. the wiener polarity index ...
herbal extracts have been successfully used in dentistry as tooth cleaning and antimicrobial plaque agents. the aim of this study was to evaluate the clinical effects of a dental gel containing barberry extracts (from berberis vulgaris) on gingivitis and microbial plaque control. a double blind clinical trial study was conducted in a dormitory on 45 boys aged 11-12 years having the same socioec...
طوفان های گرد و غباری که اغلب در مناطق خشک و نیمه خشک جهان روی می دهند حجم زیادی از ذرات معلق را با خود حمل میکنند و از اینرو به عنوان یکی از مهمترین معضلات زیست محیطی در مقیاس های منطقه ای و بین المللی تلقی میگردند. این تحقیق به ارزیابی مقادیر فلزات سنگین در ذرات گرد و غبار ته نشین شده در شهرهای سنندج، خرم آباد و اندیمشک در غرب ایران میپردازد. نمونه برداری ذرات گرد و غبار از 30 خرداد 1391 بمدت...
Compiling indexing operations on n-dimensional arrays into efficiently executable code is a challenging task. This paper focuses on the reduction of offset computations as they typically occur when transforming index vectors into offsets for linearized representations of ndimensional arrays. We present a high-level optimization to that effect which is generally applicable, even in the presence ...
the main purpose of this paper is to study urban management performance in public green spaces (parks) based on economical indexes, social indexes and environmental indexes. for this purposes, we use topsis method that is one of the methods of multiple criteria decision making. the data was obtained through interview and also a questionnaire which was distributed among about 1000 families of ma...
abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...
Limitations of impact indices to compare scholars across disciplines and time based only the number of publications and citations are discussed. The S-index, based on more comprehensive scholar impact factors, is proposed.
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