فهرست مقالات Pads

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  1 - بررسی ایهام و بعضی از انواع آن در نسخه ی خطی «پادشاهنامه»کلیم کاشانی
  محمدرضا شریفی
  ایهام ( (Equivoqueیکی از شگردها، ترفندها و امکانات زبانی است. این صنعت بدیعی را از انواع هنجار گریزی های معنایی می دانند که در محور همنشینی و مجاورت که مبتنی بر ترکیب است، به وجود می آید و کلام را با ابهام (Ambiguity= ) که از عناصر زبانی و ادبی است، پیوند می دهد.ایهام ن چکیده کامل

  ایهام ( (Equivoqueیکی از شگردها، ترفندها و امکانات زبانی است. این صنعت بدیعی را از انواع هنجار گریزی های معنایی می دانند که در محور همنشینی و مجاورت که مبتنی بر ترکیب است، به وجود می آید و کلام را با ابهام (Ambiguity= ) که از عناصر زبانی و ادبی است، پیوند می دهد.ایهام نوعی شگفت کاری با زبان است زیرا وقتی مخاطب با کمی چالش و دقّت چند معنا - حتی گاه متضاد - را از لفظ و عبارت در می یابد، لذت و میلش به متن بیشتر می شود. اگر چه ایهام بیشتر در سبک عراقی ظهور می کند و در شعر خاقانی، سعدی و بالاخره حافظ به اوج می رسد. برخلاف بعضی کسانی که معتقدند شاعران در سبک هندی از صنایع بدیعی و بیانی استفاده نکرده اند، باید گفت که توجه به رعایت تناسب ها و روابط معنایی میان کلمات و اجزاء بیت یکی از گرایشهای ذوقی عصر صفوی است و شاعرانی چون کلیم، صائب و بیدل به صنایع بدیعی و بیانی به ویژه ایهام توجه کامل داشته اند. این مقاله کوششی در جهت شناختن ایهام و بعضی از انواع آن همراه با صنایع بدیعی و بیانی در نسخۀ خطی پادشاهنامۀ کلیم کاشانی (960- 1061ه.ق) است پرونده مقاله
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  2 - A Case Study of Three Different Brake Pads Used in Iranian Rail Systems
  A. Nasr M. H. Esnaashary
  Brake system and its components are of high importance in rail transportation systems. In this regard, brake linings, pads and blocks are especially important and this is why periodic evaluation of these parts is common practice in all rail systems. In this paper, some چکیده کامل

  Brake system and its components are of high importance in rail transportation systems. In this regard, brake linings, pads and blocks are especially important and this is why periodic evaluation of these parts is common practice in all rail systems. In this paper, some characteristics of three types of brake pads (friction materials in disc type brake mechanism) named types A, B and C (not to reveal the brand types) used in Iranian railways are compared against each other. Type A is an European product and the other two are Iranian pads manufactured domestically at different stages (type B is a new product and type C is an old one). The surface of pads, its compound, density, porosity, water adsorption, and impact strength and friction coefficient are evaluated. By comparing the results, it is appeared that the European brake pad possessed the lowest porosity, the highest impact strength and variation of its friction coefficient was more stable than the others. In addition, the performance of the type C compared with type B seemed to be much better in regard to wear rate and impact strength. پرونده مقاله
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  3 - Simulation and Dynamic-Thermal Analysis of Ceramic Disc and Brake Pad for Optimization by Finite Element Method
  Navvab Gholami Ahmad Afsari Seyed Mohammad Reza Nazemosadat Mohammad Javad Afsari
  10.30486/admt.2024.1980467.1402
  The braking system in cars is directly deals with the issue of safety, and as a result, it is essential to pay attention to this matter. One of the materials used to make disc and brake pads in disc brakes is a ceramic material. This research aims to simulate and analyz چکیده کامل

  The braking system in cars is directly deals with the issue of safety, and as a result, it is essential to pay attention to this matter. One of the materials used to make disc and brake pads in disc brakes is a ceramic material. This research aims to simulate and analyze the dynamic-thermal ceramic brake disc during the braking operation using the finite element method. Currently, the conventional brake disc is used in the Peugeot 206 car (domestic production), which has low efficiency in terms of life, wear, etc. Therefore, in this research, considering the significant production of Peugeot 206 car in the country, the disc and brake pads of this car have been selected, which were first modeled by Catia software, and after transferring the model to Abacus software and defining the types of ceramics and Cast iron was analyzed by finite element method. Compared the results of the Peugeot 206 ceramic brake disc and pad analysis were with the results of the standard (cast iron) discs in this car. The results showed that the maximum von Mises stress in the ceramic disc was 260.7 MPa, while the maximum von Mises stress in the cast iron disc was 293.3 MPa. The amount of heat produced in the ceramic disc during the braking action in 4 seconds was almost 84% less than the cast iron disc in the same period. Also, the results showed that the ceramic disc has a higher safety factor (1.98) than the cast iron disc (1.45). پرونده مقاله