نتایج جستجو برای: geometricarithmetic index

تعداد نتایج: 396062  

Journal: :iranian journal of mathematical chemistry 2015
m. eliasi

the total irregularity of a graph g is defined as 〖irr〗_t (g)=1/2 ∑_(u,v∈v(g))▒〖|d_u-d_v |〗, where d_u denotes the degree of a vertex u∈v(g). in this paper by using the gini index, we obtain the ordering of the total irregularity index for some classes of connected graphs, with the same number of vertices.

Journal: :iranian journal of mathematical chemistry 2013
m. rostami m. sohrabi-haghighat m. ghorbani

the atom-bond connectivity index of graph is a topological index proposed by estrada et al.as abc (g)  uve (g ) (du dv  2) / dudv , where the summation goes over all edges ofg, du and dv are the degrees of the terminal vertices u and v of edge uv. in the present paper,some upper bounds for the second type of atom-bond connectivity index are computed.

Journal: :iranian journal of mathematical chemistry 2014
alexander vasilyev

symmetric division deg index is one of the 148 discrete adriatic indices that showed good predictive properties on the testing sets provided by international academy of mathematical chemistry.symmetric division deg index is defined by$$sdd(g) = sume left( frac{min{d_u,d_v}}{max{d_u,d_v}} + frac{max{d_u,d_v}}{min{d_u,d_v}} right),$$where $d_i$ is the degree of vertex $i$ in graph $g$.in this pap...

Journal: :caspian journal of mathematical sciences 2015
a. azad n. elahinezhad

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|...

Journal: :transactions on combinatorics 2015
abolghasem soltani ali iranmanesh

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...

Journal: :journal of research in medical sciences 0
mehnoosh samadi departments of community nutrition, school of nutritional sciences and dietetics and school of public health, tehran university of medical sciences, tehran, iran haleh sadrzadeh-yeganeh departments of community nutrition, school of nutritional sciences and dietetics and school of public health, tehran university of medical sciences, tehran, iran leila azadbakht food security research center, isfahan university of medical sciences, school of nutrition and food sciences, isfahan university of medical sciences, isfahan, iran kourosh jafarian departments of community nutrition, school of nutritional sciences and dietetics and school of public health, tehran university of medical sciences, tehran, iran abbas rahimi department of statistics and epidemiology, school of public health, tehran university of medical sciences, tehran, iran gity sotoudeh departments of community nutrition, school of nutritional sciences and dietetics and school of public health, tehran university of medical sciences, tehran, iran

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...

Journal: :mathematics interdisciplinary research 0
mojgan mogharrab persian gulf university reza sharafdini persian gulf university somayeh musavi mathematics house of bushehr

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 ...

Journal: :acta medica iranica 0
a. makarem n. khalili r. asodeh

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...

ژورنال: :علوم محیطی 0
مهدی رجبی فارغ التحصیل دانکشده منابع طبیعی-دانشگاه کردستان

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...

2006
Robert Bernecky Stephan Herhut Sven-Bodo Scholz Kai Trojahner Clemens Grelck Alexander V. Shafarenko

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 ...

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