List of Articles Surfaces

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - L_1 operator and Gauss map of quadric surfaces
  A. Mohammadpouri L. Kafili R. Hosseinoghli
  The quadrics are all surfaces that can be expressed as a second degree polynomialin x, y and z. We study the Gauss map G of quadric surfaces in the 3-dimensional Euclidean space R^3 with respect to the so called L_1 operator ( Cheng-Yau operator □) acting on the smooth More

  The quadrics are all surfaces that can be expressed as a second degree polynomialin x, y and z. We study the Gauss map G of quadric surfaces in the 3-dimensional Euclidean space R^3 with respect to the so called L_1 operator ( Cheng-Yau operator □) acting on the smooth functions defined on the surfaces. For any smooth functions f defined on the surfaces, L_f=tr(P_1o hessf), where P_1 is the1-th Newton transformation associated to the second fundamental form ofthe surface and hessf denotes the self-adjoint linear operator metrically equivalent to the Hessian of, L_1G=(L_1G_1, L_1G_2, L_1G_3), G=(G_1, G_2, G_3). As a result, we establish the classification theorem that the only quadric surfaces with Gauss map G satisfying L_1G=AG for some 3×3 matrix A are the spheres and flat ones. Furthermore, the spheres are the only compact quadric surfaces with Gauss map G satisfying L_1G=AG for some 3×3 matrix A. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - The Geomorphology of Darangir playa
  R. Noujavan H. Sadough
  Every kind of Geomorphological Landscapes has a basic roll in regionaldevelopment.In Yazd province using every kind of land use projects withought consideringplaya's landscape can't Complot the chain of it's development and Constraction,because. The playa's landscape is More

  Every kind of Geomorphological Landscapes has a basic roll in regionaldevelopment.In Yazd province using every kind of land use projects withought consideringplaya's landscape can't Complot the chain of it's development and Constraction,because. The playa's landscape is one of the basic. Units of morphotectonic. In thisprovince. (Siah Kooh playa – Abar kooh playa Daranjir- Harat and marvast playa's andSaghand playa and….)Finding away for using, Landuse projects has a special roll in regional developmentAnd researching and recognizing this landscapes is one of the basic part of landuseproject in this province.Among of these playa's , Daranjir or bafgh playa is the thired playa (From the pointof area viwes) which it's shape like a hole (North – west to south – east).It's placed between kharanagh and bafgh. Which is in east of Yazd province.In this paper. Which is provide in base of Analytical Methodes and using a numberof digital dataes, in GIS Frame work, We can recognized different geomorphologicalaspects of this region and it's potential. In five surfaces (Convex, Concave – traces andun sustainability wind surfaces) and Conclude that: Knowing the paleo and dinamysmgeomorphology Of this region.Has an important roll in Document of Development sterategy Frame work .Because of the result of this researches. Salinization process is active in Daranjirplaya now (We can see it's effects on different part of playa).There are some Evidence of active Tectonic in the south – west of this region andanalysis of drainages show anticidence conception too.Because of above Conclusion and several other limitations we can say this region isnot suitable for development in tourism Field.The main axes of development in this area can be concentrated on mine activitiesespecially. Rare metals element which is deposite in playa Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - syntax analysis of short story “entekhab” by Simin Daneshvar based on Paris school
  fahime golnar ahmad zakeri
  10.30495/dk.2022.690472
  the semantic sign analysis of the Paris school examines the relationship between linguistic signs in discursive system and the study of two narrative and semantic structures in two levels of structured and profound construction. This analysis shows that a sign in relati More

  the semantic sign analysis of the Paris school examines the relationship between linguistic signs in discursive system and the study of two narrative and semantic structures in two levels of structured and profound construction. This analysis shows that a sign in relation to other discriminant signs goes through a process that has a special meaning. In the study of surface structure of elements such as the external and internal forms of discourse, the dynamic dimension of the word, the role of effective verbs, actors, action, the relationship of elements in the axis of substitution and association, features and isotopes, and the like, and in the deep study of the semantic square and its relationship with the narrative structure and the semantic role of effective verbs in theology and in the interactive level of discourse, the study of the dimensions of cognitive, action, and emotional, are effective tools in semantic analysis. In this descriptive – analytical study, we tried to examine the structure of narrative syntax in the story of “entekhab” by Simin Daneshvar by studing the elements of narrative syntax, we show discursive signs in many stories of such a process to lead to the formation of the meaning of the story. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  4 - Preparation of Nitrogen-Doped Graphene Aerogel/Epoxy Nanocomposites and Experimental Study of Mechanical Properties
  ali kordi saeed adibnazari Ali Imam mohammad najafi maryam ghasabzadeh saryazdi
  10.30495/admt.2020.1904850.1205
  Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  5 - Numerical Simulation of Pool Boiling Heat Transfer, Focusing On Surface Structural Characteristics In ANSYS Fluent: A review
  Ermia Zargham Mohammad Hassan Nobakhti morteza khayat
  Multiphase flows, such as pool boiling, are complex multi-physical -multi-scale problems that require a multitude of numerical techniques to solve different physics combined for a specific set of flow parameters and different regimes. For this reason, a well-established More

  Multiphase flows, such as pool boiling, are complex multi-physical -multi-scale problems that require a multitude of numerical techniques to solve different physics combined for a specific set of flow parameters and different regimes. For this reason, a well-established numerical solution for well-validated predictive simulations has not yet been clearly defined. The main purpose of this study is to summarize the methods and basic principles of numerical simulation of pool boiling and explain all the steps of its implementation in ANSYS Fluent software in a clear and transparent manner. In this research, the details of numerical models and the results obtained for the nucleate boiling regime are presented to analyze the single bubble dynamics and calculate the critical heat flux. Heat flux is also included. The results of this study show that numerical simulations have a relatively good agreement with laboratory and experimental data. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  6 - Investigation of Mass Magnetic Abrasive Finishing Process on Compressor Blades
  Seyed Alireza Rasouli Davood Nori
  Attempts at research across various industries to achieve high-quality surfaces have led to the development of new finishing processes. Magnetic Abrasive Finishing is a novel technique where a magnetic field is employed to control an abrasive tool. Gas turbine compresso More

  Attempts at research across various industries to achieve high-quality surfaces have led to the development of new finishing processes. Magnetic Abrasive Finishing is a novel technique where a magnetic field is employed to control an abrasive tool. Gas turbine compressor blades are among the industrial components requiring high surface quality due to their exposed surfaces. The reduction in surface roughness on these components has a significant impact on the efficiency of motor turbines. This paper focuses on studying the Magnetic Abrasive Finishing process parameters for the free surfaces of Titanium blades. Using a mass Magnetic Abrasive Finishing machine, the influence of powder weight, type of abrasive particles, and gap on the variation of surface roughness is investigated through statistical methods such as the response surface. The fabrication of the machine and determination of magnet polarity are carried out using Maxwell simulation software. The Factorial method is employed for experiment configuration. Mechanically alloyed powders produced by ball mills are used in this study. Results demonstrate that employing the magnetic abrasive method can reduce the surface roughness of the blade by up to 33%. The empirical model derived from regression analysis is utilized to predict the variation in surface roughness. Variance analysis of the experimental results indicates the significance of all studied parameters. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) are employed for a qualitative evaluation of the results. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  7 - Photo corrosion of titania nanotubes within water splitting reaction
  Shahab Khameneh Asl Deniz Unar
  Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  8 - Application of Gireh on Free Surface Pattern with Recognition of Gireh Projection on Iranian Domes Surface in the Congruence Method
  Aref Azizpour Shoubi َAhad NeJad Ebrahimi
  10.30495/jsps.2023.1976429.1027
  Free surfaces are one of the requirements of contemporary architecture. Owing to the emergence of these surfaces, the configuration of Girehs in Islamic architecture became incompatible with them. The traditional structural principles of Girehs expand two-dimensionally, More

  Free surfaces are one of the requirements of contemporary architecture. Owing to the emergence of these surfaces, the configuration of Girehs in Islamic architecture became incompatible with them. The traditional structural principles of Girehs expand two-dimensionally, whereas free surfaces expand irregularly and three-dimensionally. Gireh-work is considered one of the original and identity-giving decorations in Islamic architecture. To identify and develop contemporary architecture and past architectural achievements, it is necessary to find a strategy for projecting Girehes on free surfaces based on historical authenticity. The Islamic architecture of Iran has had many valuable achievements that can be applied to contemporary architectural challenges. In Iranian Islamic architecture, the dome and Gireh decoration play a crucial role, so the Iranian architect has tried to match these two elements using the geometric features of the dome and Gireh. As part of a qualitative research process, two examples of Iranian domes have been selected and analyzed with a descriptive-analytical approach in order to answer the following question: how Gireh’s geometrical principles on domical surfaces can be applied to contemporary free surfaces? In order to project Gireh onto the dome, a network based on radial gore segments was used as part of the projection technique. Transferring Girehs based on this network causes congruence homogeneity. Topological models of free surfaces are based on NURBS lines, making it possible to discretize and define the points on them. This makes it possible to apply anisotropic congruence transformation to Gireh projections on free surfaces. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  9 - مطالعه تجربی جهت اضافه کردن سطوح زبر در قسمت کف خودرو و مقایسه ضرایب آیرودینامیکی
  کوروش رایزن احمد کشاورزی
  After the invention of the automobile, people soon realized the relationship between air resistance and the movement of cars. Over time, the improved performance of the car from different directions and increase fuel price, improved aerodynamics also became the fundamen More

  After the invention of the automobile, people soon realized the relationship between air resistance and the movement of cars. Over time, the improved performance of the car from different directions and increase fuel price, improved aerodynamics also became the fundamental question. The researchers found that attention to aerodynamics not only to achieve higher speeds, but also appropriate to reduce fuel consumption and vehicle stability. That's why a lot of research has been done on the car's aerodynamics followed on.This article will examine the effect of surface roughness underside of the vehicle at some point. In this method procedure we study on two zones which have maximum probability of separation flow. These zones find on rear of wheels on floor of vehicle. Results compare with case which is smooth . We achieve to a unique conclusions. And also experimentally in wind tunnel tests, the optimum dimensions for rough surfaces are derived. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  10 - Performance of geopedology approach in mapping of agricultural soils within Aidoghmoush dam downstream lands in Miyaneh, Iran
  Naser Nazari Shahla Mahmoodi Mohammad Hasan Masihabadi
  10.22034/aej.2016.523338
  <strong>ABSTRACT&nbsp;&nbsp; &nbsp;</strong>The geopedological method is one of the systematic methods for analyzing geomorphic surfaces in soil mapping in which field work is mainly based on work in the sample area. This research intended to investigate the degree of v More

  <strong>ABSTRACT&nbsp;&nbsp; &nbsp;</strong>The geopedological method is one of the systematic methods for analyzing geomorphic surfaces in soil mapping in which field work is mainly based on work in the sample area. This research intended to investigate the degree of validity generalization of results obtained in the geopedological method for similar landforms in the Miyaneh region of East Azarbaijan Province. For this purpose, soil diversity study was conducted through measuring it in a hierarchical sequence in USDA soil taxonomy levels and by comparing similar units in the geopedological method through employing diversity and similarity indices. After preparing the initial interpretative map (based on aerial photographs) at a scale of 1:20000, the HPu211 unit that covered the greatest delineation of study area was selected and 15 soil profiles, about 150 meters apart, were excavated, described, and sampled in this unit. The degree of validity generalization of geopedological results for the mentioned unit was determined by digging nine other soil profiles in a similar unit, called the generalization area, which was located outside of the sample area. Results indicated the value of Shannon&rsquo;s diversity index increased from the level of soil order to soil family in both the sample and the generalization areas; however, only at the soil family level were there significant differences between soil diversity in the two areas at the confidence level of 95%. Even by changing the understanding level, and through concentrating on the sequence of genetic horizons in the excavated profiles in the sample and generalization areas, increased soil diversity in the soil taxonomic hierarchy was proved. Therefore, it is recommended that landform phases be used, and soil family phase and/or soil series phase be determined for each landform phase, to increase the accuracy of the geopedological method. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  11 - Influence of sample area location on geopedology approach results in soil mapping: case study of Miyaneh area, Azarbayejan-e-Sharghi province
  Naser Nazari Shahla Mahmoodi Mohammad Hasan Masihabadi
  Geopedology allows a systematic approach in geomorphic analysis for soil mapping that extrapolates the results obtained in sample areas up to similar units in the field operations.&nbsp; Due to the unknown accuracy of the maps created by geopedologiy approach in the lar More

  Geopedology allows a systematic approach in geomorphic analysis for soil mapping that extrapolates the results obtained in sample areas up to similar units in the field operations.&nbsp; Due to the unknown accuracy of the maps created by geopedologiy approach in the large scales, this paper examines the location of sample area in order to determine the amount of credibility for generalization of geopedological approach results for similar landforms in Miyaneh region, Azarbayejan&shy;-&shy;e&shy;-&shy;Sharghi province. After the initial interpretation of the study area on aerial photos with scale of 1:20000, a geomorphic unit that encompassed the maximum surface of the sample area (and also the study area namely P_i122) was selected and was surveyed. The sample area was designed in three different locations and five soil profile intervals of approximately 150 m in this unit (a total of 15 profiles), were excavated, described and sampled. The credibility of generalization for geopedological approach results for the studied unit was tested by comparison with three profiles in a similar unit (a total of nine profiles) outside the sample area, named the validation area. This soil map completed in the framework of second-order soil surveys. The results showed that change of sample area location resulted in differences in taxonomic levels (order, subgroup, and soil family) and map unit types (complex and consociation) for HPu211 unit. Therefore, &nbsp;in &nbsp;order to increase the accuracy of the geopedological results, the use of landform phases and also phases of soil families and&shy;/or series for each landform phases is recommended. Manuscript profile