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)

New Algorithm For Computing Secondary Invariants of Invariant Rings of Monomial Groups

Sajjad Rahmany; Abdolali Basiri; Behzad Salehian

Volume 49, Issue 2 , December 2017, , Pages 103-111


  In this paper, a new  algorithm for computing secondary invariants of  invariant rings of monomial groups is presented. The main idea is to compute simultaneously a truncated SAGBI-\G basis and the standard invariants of the ideal generated by the set of primary invariants.  The advantage ...  Read More

Minimizing the Number of Tardy Jobs on Single Machine Scheduling with Flexible Maintenance Time

Fatemeh Ganji; Amir Jamali

Volume 50, issue 2 , December 2018, , Pages 103-119


  In this study, single machine scheduling with flexible maintenance is investigated with non-resumable jobs by minimizing the weighted number of tardy jobs. It is assumed that the machine stops for a constant interval time during the scheduling period to perform maintenance. In other words, the starting ...  Read More

Constructing Graceful Graphs with Caterpillars

Christian Barrientos; Sarah Minion

Volume 48, Issue 1 , December 2016, , Pages 117-125


  A graceful labeling of a graph G of size n is an injective assignment of integers from {0, 1,..., n} to the vertices of G, such that when each edge of G has assigned a weight, given by the absolute di erence of the labels of its end vertices, the set of weights is {1, 2,..., n}. If a graceful labeling ...  Read More

Defining the Tipping Point Based on Conditionally Convergent Series: Explaining the Indeterminacy

Mohammad Hosseini Moghaddam; Tahmineh Sahverdi

Volume 50, Issue 1 , June 2018, , Pages 133-142


  Tipping Point refers to the moment when an adaption or infection sustains itself in network without further external inputs. Until now, studies have mainly focused on the occurrence of the Tipping Point and what it leads to rather than what precedes it. This paper explores the situation leading to the ...  Read More

تعیین پارامترهای انتقال حرارت با استفاده از داده های آزمایشگاهی و حل تحلیلی به روش تقریبی تغییر شکل محدود انتگرال

Mohammad Reza Talaghat; Abdolhossein Jahanmiri

Volume 41, Issue 2 , July 2007, , Pages 193-201


  This paper presents a study on estimation of heat transfer coefficient and thermal diffusivity parameters by use of analytical solutions and experimental data for regular geometries (infinite slab, infinite cylinder and sphere). Analytical solutions have a broad use in experimentally determining these ...  Read More

ﺍﺻﻼﺡ ﺳﻴﺴﺘﻢ ﺭﺍﻫﮕﺎﻫﻲ ﻃﺒﻴﻌﻲ- ﻓﺸﺎﺭﻱ ﺑﺮﺍﻱ ﺭﻳﺨﺘﻪ ﮔﺮﻱ ﻗﻄﻌﺎﺕ ﺁﻟﻮﻣﻴﻨﻴﻤﻲ

Hatef Hashemi; Ramin Raiszadeh

Volume 43, Issue 2 , July 2009, , Pages 217-228


  In this research, the effect of friction between the liquid metal and the sand mould wall and the effect of passage of liquid through a vertical bend and through a ceramic filter on the fluid flow and the melt velocity has been studied by measuring the velocity of the melt and direct observation of the ...  Read More

آنالیز انرژی و اکسرژی یک برج سرمایش-رطوبت‌زنی گاز همسو بر مبنای نتایج مدلسازی ریاضی و شبیه‌سازی

Arezou Nikseir; Amir Rahimi

Volume 42, Issue 2 , May 2008, , Pages 239-247


  Beginning with a discussion of energy and exergy analysis definitions, the presented study provides a descriptive mathematical model for energy and exergy analysis for a co-current gas cooling tower. For this purpose using conservation laws of mass, energy and momentum, the variation of temperature and ...  Read More

تحلیل پایداری دیواره غربی معدن مس سرچشمه با استفاده از روش المان مجزای سه‌بعدی

Mehdi Mousavi; Ali Reza Yarahmadi Bafghi; Hamid Reza Bakhshi

Volume 43, Issue 3 , September 2009, , Pages 311-323


  In the past, rock slope stability analysis were performed either graphically or using a hand-held calculator, but nowadays there are variety of slope stability analysis which can be used according to the field condition and potential failure mode. In 2-D analysis, effect of convex and concave walls are ...  Read More

انجام یک مرحله پیش پردازش قبل از مرحله استخراج ویژگی در طبقه بندی داده های تصاویر ابر طیفی

Bahram Salehi; Mohammad Javad Valadan Zoj; Mohammad Reza Sarajian

Volume 42, Issue 3 , July 2008, , Pages 327-338


  Hyperspectral data potentially contain more information than multispectral data because of their higher spectral resolution. However, the stochastic data analysis approaches that have been successfully applied to multispectral data are not as effective for hyperspectral data as well. Various investigations ...  Read More

بررسی آزمایشگاهی و صحرایی تثبیت خطوط لوله مدفون در زمین های اشباع

Mohsen Najimi Varzaneh; Hossein Rajaie

Volume 42, Issue 4 , August 2008, , Pages 523-532


  Large deformation causing damage due to uplift force is generated in buried pipeline located in shallow trenches in marshes and saturated soils. In this paper, existing common methods of pipeline anchorage are discussed and considering advantages and disadvantages of these methods, a new method of pipeline ...  Read More

بررسی اثر تزویج متقابل بر مشخصات تشعشعی یک آرایه آنتن مسطح محدود شامل پچ های مستطیلی

Fa'egheh Amirzadeh; Mahmoud Kamare'i; Gholamreza Dadashzadeh

Volume 41, Issue 5 , December 2007, , Pages 557-566


  In this paper a novel method for computing the radiation pattern and also the input impedance of a planar rectangular micro-strip antenna array with consideration of mutual coupling and mutual impedance is presented. Each two triangles with a common edge make an Edge element or RWG. Any such edge element ...  Read More

روش اختلاط عمیق جهت بهبود خواص مقاومتی زمین های ماسه‌ای ساختگاه پروژه زیتون 2 در بندرعباس

Abbas Majdi; Siavash Litkouhi; Mehdi Hajian Hosseinabadai

Volume 42, Issue 5 , September 2008, , Pages 595-606


  In deep mixing method lime or cement and or a combination of the two are mixed with in-situ soils by means of an auger to improve the strength properties of the soils. Strength of the improved soils may be evaluated in different ways, so that, the uniaxial compressive strength assessment is one of the ...  Read More

هینه‌سازی مسیر‌ هاد‌ی‌های انتقال در محفظه فلزی تجهیزات الکتریکی مبتنی بر سازگاری الکترومغناطیسی با استفاده از روش تصمیم‌گیری چند معیاره مطالعه موردی: سیستم تزریق جریان 25 کیلو آمپر

Faramarz Faghihi; Hossein Heydari; Vahid Abbasi

Volume 43, Issue 5 , September 2009, , Pages 681-691


  The higher frequency transient signals generated as a result of a power system fault or disturbance provide the basis for an alternative approach to power system containing connectors and cables result in unsuitable operation of the system. However one major challenge is the need to ensure that the transients ...  Read More

بررسی رفتار و طراحی اتصال خمشی با ورق انتهایی هم تراز به روش اجزاء محدود تحت بارگذاری متناوب

Mehdi Ghassemieh; Vahid Zeynoddini Meymand

Volume 41, Issue 6 , January 2008, , Pages 775-786


  The use of steel flush end-plate moment connection is practiced in the construction of the light steel frames around the world particularly in parts of Europe and US. In the past most research was concentrated on studying the behavior of the flush end-plate connection subjected to only monotonic type ...  Read More

روش مسیر یابی ذره به منظور پیش بینی حرکت نفت در دریا

Mohsen Naghibi; Morteza Kolahdouzan

Volume 42, Issue 6 , December 2008, , Pages 795-807


  A two-dimensional two-phase numerical model is developed to predict transport and fate of oil slicks which resulted the concentration distribution of oil on the water surface. Two dimensional governing equation of fluid flow which consists mass and momentum conservation was solved using the finite difference ...  Read More

حذف هارمونیک های انتخابی مراتب بالا در مبدل های چندسطحی با استفاده از الگوریتم مهاجرت پرندگان

Hassan Taghizadeh; Mehrdad Tarafdar Hagh

Volume 42, Issue 7 , January 2009, , Pages 901-912


  This paper presents a new method to find the optimum switching angles in voltage source multilevel converters in order to minimize specific higher order harmonics and decrease the total harmonic distortion (THD) of their output voltage waveform. The output voltage waveform of inverter can either be in ...  Read More

Transfer of Bargaining Power Sources in Oil Trade Games

Ardeshir Ahmadi; Azizollah Memariani

Volume 41, Issue 7 , February 2009, , Pages 955-958


  Bargaining Power is one of the important issues in oil trade negotiations. In this paper two effective factors in bargaining power i.e. patient time to deal and outside options of each player have been considered. The necessary relations for exchange of sources in negotiation have been derived.  Read More

مدل سازی ریاضی انتقال جرم گازها در غشا‌ءهای نامتقارن متخلخل پلیمری

Sara Farhangi; Mojtaba Shariati Niasar; Mohammad Soltanieh; Mehdi Pourafshari Chenar

Volume 42, Issue 8 , February 2009, , Pages 1007-1016


  It is several decades that the application of membrane processes for gas separation has become a great concern within industries. Among them, the polymeric membranes of different structures have played the most important role. Such application has been widely extended to gas separation and due to the ...  Read More

بررسی شکل پذیری چشمه اتصال تحت شرایط هندسی متفاوت

Behrokh Hosseini Hashemi; Rouhollah Ahmadi Jazani

Volume 41, Issue 1 , March 2007, , Pages 35-45


  Panel zone is one of the most important elements for transferring the lateral load to other elements in Steel Moment Resistant Frames. To some extent, this element through its suitable ductile behavior with beams, that themselves have been known as ductile elements, can increase the overall ductility ...  Read More

تحلیل تجربی و عددی انتقال حرارت جابجایی آزاد از روی صفحه موجی شکل درون یک کانال عمودی

Mehdi Ashjaee; Hossein Shokouhmand; Mehdi Amiri; Touraj Yousefi

Volume 42, Issue 1 , April 2008, , Pages 39-48


  Laminar free convection heat transfer from vertical and inclined arrays of horizontal isothermal cylinders in air was investigated experimentally and numerically. Experiments were carried out using Mach-Zehnder interferometer and the FLUENT code was used for numerical study. Investigation was performed ...  Read More

تأثیر مدل‌سازی تراک1 در محاسبه خواص موج بلاست ناشی از انفجار ابر هوا- سوخت

Kiumars Mazaheri; Ali Tarokh

Volume 43, Issue 1 , April 2009, , Pages 89-102


  In this work the effect of the accuracy of a FAE detonation modeling on the generated blast wave is investigated. First, a one-dimensional numerical simulation with a reduced chemical kinetics of C2H2-O2-Ar, involving 25 elementary reactions, is used as the base model. The properties of the blast calculated ...  Read More

A Cellular Automaton Based Algorithm for Mobile Sensor Gathering

S. Saadatmand; D. Moazzami; A. Moeini

Volume 47, Issue 1 , June 2016, , Pages 93-99


  In this paper we proposed a Cellular Automaton based local algorithm to solve the autonomously sensor gathering problem in Mobile Wireless Sensor Networks (MWSN). In this problem initially the connected mobile sensors deployed in the network and goal is gather all sensors into one location. The sensors ...  Read More