Volume 55 (2023)
Volume 54 (2022)
Volume 53 (2021)
Volume 52 (2020)
Volume 51 (2019)
Volume 50 (2018)
Volume 49 (2017)
Volume 48 (2016)
Volume 47 (2016)
Volume 46 (2015)
Volume 45 (2014)
Volume 44 (2013)
Volume 43 (2009)
Volume 42 (2008)
Volume 41 (2007)
Number of Articles: 447
ارزیابی عملکرد نوارهای پیچیده شده درافزایش انتقال حرارت چگالشی و تأثیر آن برمیزان افت فشار
Volume 43, Issue 1 , April 2009, , Pages 1-9
Abstract
In this research, heat transfer enhancement and simultaneous effect of that on pressure drop inside condensers with twisted tape inserts are investigated. A refrigeration system is designed for attaining to maximum level of heat transfer with minimum pressure drop. The test condenser is a double pipe ... Read MoreConstructions of antimagic labelings for some families of regular graphs
Volume 44, Issue 1 , December 2013, , Pages 1-7
Abstract
In this paper we construct antimagic labelings of the regular complete multipartite graphs and we also extend the construction to some families of regular graphs. Read MoreSkolem Odd Difference Mean Graphs
Volume 45, Issue 1 , December 2014, , Pages 1-12
Abstract
In this paper we define a new labeling called skolem odd difference mean labeling and investigate skolem odd difference meanness of some standard graphs. Let G = (V,E) be a graph with p vertices and q edges. G is said be skolem odd difference mean if there exists a function f : V (G) → {0, 1, 2, 3, ... Read MoreTotally magic cordial labeling of some graphs
Volume 46, Issue 1 , December 2015, , Pages 1-8
Abstract
A graph G is said to have a totally magic cordial labeling with constant C if there exists a mapping f : V (G) ∪ E(G) → {0, 1} such that f(a) + f(b) + f(ab) ≡ C (mod 2) for all ab ∈ E(G) and |nf (0) − nf (1)| ≤ 1, where nf (i) (i = 0, 1) is the sum of ... Read More3-difference cordial labeling of some cycle related graphs
Volume 47, Issue 1 , June 2016, , Pages 1-10
Abstract
Let G be a (p, q) graph. Let k be an integer with 2 ≤ k ≤ p and f from V (G) to the set {1, 2, . . . , k} be a map. For each edge uv, assign the label |f(u) − f(v)|. The function f is called a k-difference cordial labeling of G if |νf (i) − vf (j)| ≤ 1 and ... Read MoreDeciding Graph non-Hamiltonicity via a Closure Algorithm
Volume 48, Issue 1 , December 2016, , Pages 1-35
Abstract
We present a matching and LP based heuristic algorithm that decides graph non-Hamiltonicity. Each of the n! Hamilton cycles in a complete directed graph on n + 1 vertices corresponds with each of the n! n-permutation matrices P, such that pu,i = 1 if and only if the ith arc in a cycle enters vertex u, ... Read MoreTheta Graph Designs
Volume 49, Issue 1 , June 2017, , Pages 1-16
Abstract
We solve the design spectrum problem for all theta graphs with 10, 11, 12, 13, 14 and 15 edges. Read MoreA novel algorithm to determine the leaf (leaves) of a binary tree from its preorder and postorder traversals
Volume 49, Issue 2 , December 2017, , Pages 1-11
Abstract
Binary trees are essential structures in Computer Science. The leaf (leaves) of a binary tree is one of the most significant aspects of it. In this study, we prove that the order of a leaf (leaves) of a binary tree is the same in the main tree traversals; preorder, inorder, and postorder. Then, we prove ... Read MoreSharp Upper bounds for Multiplicative Version of Degree Distance and Multiplicative Version of Gutman Index of Some Products of Graphs
Volume 50, Issue 1 , June 2018, , Pages 1-28
Abstract
In $1994,$ degree distance of a graph was introduced by Dobrynin, Kochetova and Gutman. And Gutman proposed the Gutman index of a graph in $1994.$ In this paper, we introduce the concepts of multiplicative version of degree distance and the multiplicative version of Gutman index of a graph. ... Read More$Z_k$-Magic Labeling of Some Families of Graphs
Volume 50, issue 2 , December 2018, , Pages 1-12
Abstract
For any non-trivial abelian group A under addition a graph $G$ is said to be $A$-\textit{magic} if there exists a labeling $f:E(G) \rightarrow A-\{0\}$ such that, the vertex labeling $f^+$ defined as $f^+(v) = \sum f(uv)$ taken over all edges $uv$ incident at $v$ is a constant. An $A$-\textit{magic} ... Read MoreSweep Line Algorithm for Convex Hull Revisited
Volume 51, Issue 1 , June 2019, , Pages 1-14
Abstract
Convex hull of some given points is the intersection of all convex sets containing them. It is used as primary structure in many other problems in computational geometry and other areas like image processing, model identification, geographical data systems, and triangular computation of a set of points ... Read MorePD-prime cordial labeling of graphs
Volume 51, Issue 2 , December 2019, , Pages 1-7
Abstract
\vspace{0.2cm} Let $G$ be a graph and $f:V(G)\rightarrow \{1,2,3,.....\left|V(G)\right|\}$ be a bijection. Let $p_{uv}=f(u)f(v)$ and\\ $ d_{uv}= \begin{cases} \left[\frac{f(u)}{f(v)}\right] ~~if~~ f(u) \geq f(v)\\ \\ \left[\frac{f(v)}{f(u)}\right] ~~if~~ f(v) \geq f(u)\\ \end{cases} $\\ for all edge ... Read MoreOn the optimization of Dombi non-linear programming
Volume 52, Issue 1 , June 2020, , Pages 1-36
Abstract
Dombi family of t-norms includes a parametric family of continuous strict t-norms, whose members are increasing functions of the parameter. This family of t-norms covers the whole spectrum of t-norms when the parameter is changed from zero to infinity. In this paper, we study a nonlinear optimization ... Read More$4$-total mean cordial labeling in subdivision graphs
Volume 52, Issue 2 , December 2020, , Pages 1-11
Abstract
Let $G$ be a graph. Let $f:V\left(G\right)\rightarrow \left\{0,1,2,\ldots,k-1\right\}$ be a function where $k\in \mathbb{N}$ and $k>1$. For each edge $uv$, assign the label $f\left(uv\right)=\left\lceil \frac{f\left(u\right)+f\left(v\right)}{2}\right\rceil$. $f$ is called $k$-total mean cordial ... Read MoreFr\'echet-Like Distances between Two Rooted Trees
Volume 53, Issue 1 , June 2021, , Pages 1-12
Abstract
The purpose of this paper is to extend the definition of Fr\'echet distance which measures the distance between two curves to a distance (Fr\'echet-Like distance) which measures the similarity between two rooted trees.In this paper, I prove that the Fr\'echet-Like distance between two trees is SNP-hard ... Read MorePair mean cordial labeling of graphs
Volume 54, Issue 1 , June 2022, , Pages 1-10
Abstract
In this paper, we introduce a new graph labeling called pair mean cordial labeling of graphs. Also, we investigate the pair mean cordiality of some graphs like path, cycle, complete graph, star, wheel, ladder, and comb. Read More$4$-total mean cordial labeling of spider graph
Volume 55, Issue 1 , June 2023, , Pages 1-9
Abstract
Let $G$ be a graph. Let $f:V\left(G\right)\rightarrow \left\{0,1,2,\ldots,k-1\right\}$ be a function where $k\in \mathbb{N}$ and $k>1$. For each edge $uv$, assign the label $f\left(uv\right)=\left\lceil \frac{f\left(u\right)+f\left(v\right)}{2}\right\rceil$. $f$ is called a $k$-total mean cordial ... Read MoreAll Ramsey (2K2,C4)−Minimal Graphs
Volume 46, Issue 1 , December 2015, , Pages 9-25
Abstract
Let F, G and H be non-empty graphs. The notation F → (G,H) means that if any edge of F is colored by red or blue, then either the red subgraph of F con- tains a graph G or the blue subgraph of F contains a graph H. A graph F (without isolated vertices) is called a Ramsey ... Read MoreA Survey on Complexity of Integrity Parameter
Volume 47, Issue 1 , June 2016, , Pages 11-19
Abstract
Many graph theoretical parameters have been used to describe the vulnerability of communication networks, including toughness, binding number, rate of disruption, neighbor-connectivity, integrity, mean integrity, edgeconnectivity vector, l-connectivity and tenacity. In this paper we discuss Integrity ... Read Moreبررسی تأثیر دما و طول اواپراتور و تعداد خمهای لوله حرارتی ضربانی در عملکرد آن
Volume 42, Issue 1 , April 2008, , Pages 77-86
Abstract
In this study an analytical model for open loop pulsating heat pipes (PHPs) is presented. The model predicts the effect of different parameters such as evaporator temperature, length of evaporator, filling ratio, number of turn and tube diameter on PHP's performance. The governing equations in two phase ... Read Moreبهینهسازی توپولوژی سازههای صفحهای به کمک روش SIMP و حذف مناطق شطرنجی
Volume 41, Issue 1 , March 2007, , Pages 91-102
Abstract
The SIMP approach is one of the most frequently used methods for topology optimization of structures. In this method, the relative density is expressed as a function of coordinates and varies from 0 to 1 within the design domain. Relative densities of 0 and 1 are associated to the existence and non-existence ... Read Moreبررسی عملکرد جذب گاز دی اکسید گوگرد در یک برج جذب سینیدار بدون ناودان با محلول قلیایی کربنات سدیم
Volume 42, Issue 2 , May 2008, , Pages 157-163
Abstract
In this investigation, the performance of a tower for absorption of sulphur dioxide gas into calcium carbonate solution has been studied. The trays had no downcomer and the tower itself was a scaled down pilot from industrial equipment. The industrial scale tower was used for clean up of 110000 m3/hr ... Read Moreبررسی رفتار عملیات حرارتی و خواص مکانیکی کامپوزیت های /Gr2024Al تولید شده با روش متالورژی پودردرجا
Volume 43, Issue 2 , July 2009, , Pages 177-184
Abstract
In this study, Al/Gr composites with 5,10,15,20 weight percent of graphite were produced by in-situ powder metallurgy method. The produced powder mixtures were consolidated and sintered at optimum conditions. The resultant composites were solution treated at 495?C and aged at 170?C. The influence of ... Read Moreتأثیر شرایط مختلف فلوتاسیون بر بازیابی کانههای اکسیده سرب و روی معدن گوشفیل
Volume 43, Issue 3 , September 2009, , Pages 249-257
Abstract
The lead and zinc sample from Goosh-e-Fill mine with 2.4%Pb, 8.0%Zn and 10.0% Fe, was used in different flotation experiments to recover lead and zinc minerals. The valuable minerals in prepared sample were oxidized and the results showed that the lead minerals floated at pH= 9.5 and 11.5, probably it ... Read Moreررسی وتعیین پارامترهای موثر در استخراج کاتیونهای Mn2+ و Cu2+ از بستر جامد توسط سیال فوق بحرانی
Volume 41, Issue 2 , July 2007, , Pages 253-262