-
Open Access Article
1 - Shrinkage Bayesian Estimator for the Scale Parameter of the Two Parameter Exponential Distribution under Progressive Censored Type-II Data and Generalized Entropy Loss Function
Mehdi Bazyar Dizabadi Einolah Deiri Ezzatallah baloui JamkhanehOur main objective in this paper is to analyze Bayesian Shrinkage Estimators of the parameter of two-parameter Exponential Distribution Scale under General Entropy Loss Function based on the prior conjugate distribution and Progressive Type-II Censored Data in the prese MoreOur main objective in this paper is to analyze Bayesian Shrinkage Estimators of the parameter of two-parameter Exponential Distribution Scale under General Entropy Loss Function based on the prior conjugate distribution and Progressive Type-II Censored Data in the presence of the location parameter. To this end, in the present paper, firstly, we present Shrinkage Estimator of scale parameter based on the Bayesian estimator that obtained under General Entropy Loss Function, and prior conjugate distribution, and then investigate the efficiency of the proposed estimator with other estimators, such as maximum likelihood estimator, Bayes estimator, empirical Bayesian estimator, and empirical Bayesian Shrinkage Estimator. The method used in this paper to compute empirical Bayesian estimator, and empirical Bayesian Shrinkage Estimator is guessing. Using simulated data based on Monte Carlos’ method, under six censorship schemes and with two prior distributions of Jeffrey and Hartigan, the effectiveness of estimators is compared. Finally, using actual data, the efficiency of the proposed estimators will be examined. Manuscript profile -
Open Access Article
2 - Laboratory study of expansive soil treatment using consecutive wetting and drying cycles
Amin Soltani Ali Raeesi EstabraghTreating problematic soils at the location of irrigation and drainage networks in order to prevent hydraulic structure failure and thus water losses is considered an important issue regarding water and soil conservation. Expansive soils are found in many parts of the wo MoreTreating problematic soils at the location of irrigation and drainage networks in order to prevent hydraulic structure failure and thus water losses is considered an important issue regarding water and soil conservation. Expansive soils are found in many parts of the world and are considered a worldwide problem as they cause extensive damage to structures (especially hydraulic). This paper presents the laboratory results of wetting and drying cycles for expansive clay prepared with saline (sodium chloride with a concentration of 50 g/L) to improve its quality. Soil samples were prepared by static compaction using saline water and wetting and drying cycles by a modified and conventional Oedometer apparatus. Results indicated that axial deformation caused by consecutive wetting and drying cycles decreases and reaches equilibrium after five consecutive cycles thus causing the amount of swelling and shrinkage to be equal. Furthermore swelling and shrinkage paths (void ratio versus water content paths) indicate that the general shape of a wetting or drying cycle is an S-shaped curve which will reach equilibrium thus eliminating hysteresis caused by wetting and drying in the final cycle causing identical swelling and shrinkage paths. Manuscript profile -
Open Access Article
3 - Application of Microwave as Pretreatment before Drying of Orange Slices by Infrared Radiation
Fakhreddin Salehi Maryam Tashakori Kimia SamaryIntroduction: Microwave heating is a form of dielectric heating by which it is possible the generation of heat in materials of low electrical conductivity by an applied high-frequency electric field. Materials and methods: To apply microwave pretreatment, the oranges w MoreIntroduction: Microwave heating is a form of dielectric heating by which it is possible the generation of heat in materials of low electrical conductivity by an applied high-frequency electric field. Materials and methods: To apply microwave pretreatment, the oranges were placed in the microwave for 0, 1, 2, and 3 min, and after the treatment, slices with a thickness of 0.5 cm were prepared from the oranges and, then the slices were dried using an infrared lamp with a power of 250 W. Results: By increasing the microwave treatment time from 0 to 3 minutes, the effective moisture diffusivity coefficient increased. Kinetic modeling results of the experimental data of drying orange slices showed that the best model for this process is Midilli's model. The application of microwave had a significant effect on the change of surface shrinkage of dried and rehydrated orange slices (p<0.05) and application of this pretreatment reduced the surface shrinkage of the product. Application of microwave had no significant effect on the change of color indexes (yellowness, redness, lightness, and total color change) of dried and rehydrated orange slices (p>0.05). By increasing the microwave treatment time from 0 to 3 min, the average rehydration of dried orange slices in the infrared dryer increased from 154.25% to 212.85%. Conclusion: In general, the use of microwave pretreatment before drying orange slices due to increasing mass transfer rate, reducing surface shrinkage, and increasing rehydration, is recommended. Manuscript profile -
Open Access Article
4 - Experimental and Numerical Investigation of Injection Molding Main Parameters’ Effects on Shrinkage and Warpage of a Thin Sheet Made of HDPE
Ali Massah Nathan Jafarian Jam Ehsan Soury -
Open Access Article
5 - Development of Fiber Reinforced SCM for Sustainable Construction
Iman Mehdipour Nicolas Ali Libre Mohammad Shekarchia -
Open Access Article
6 - Evaluation of Autogenous Shrinkage in High-Performance Concrete
Jamal Ahmadi Reza Naghdi2 -
Open Access Article
7 - EffectofMetakaolin and Nano-SiO2onshort and Long-term shrinkageofself-compactingcement sandmortar
Hassan Soltanshahi -
Open Access Article
8 - Finite element simulation of pyroplastic deformation, anisotropic shrinkage and heterogeneous densification for ceramic materials during liquid phase sintering process
Hamed Yaghoubi Esmail Salahi Fateme Taati -
Open Access Article
9 - Experimental Study of Packing Time and Melt Temperature Effects on Shrinkage of a Thin Sheet Made of Wood-HDPE Composite
Siavash Sobhani Nathan Jafarian Jam -
Open Access Article
10 - Using Non-Sub sampled Shearlet Transform and Nakagami Model for Ultrasound Image De-Speckling
Sedigheh Ghofrani -
Open Access Article
11 - The use of raw materials available in Yazd province for manufacturing of monoprosa tile
Fatemeh Mirjalili Sasan Otroj Hossein Badiee -
Open Access Article
12 - بررسی تجربی و عددی ضخامت قطعه بر میزان جمع شدگی و عدم گردی قطعات استوانه ای در فرآیند تزریق پلاستیک
ناتان جعفریان جم پیام سرائیان آیت اله عرب امین ابادیفرآیند تزریق پلاستیک، یکی از مهم­ترین روش­های شکل­دهی در صنعت تولید پلاستیک­ها می­باشد. جمع­شدگی و عدم­گردی پدیده­هایی هستند که کیفیت نهایی محصول را تحت تأثیر قرار می­دهند. در این تحقیق تأثیر ضخامت قطعه استوانه­ای از جنس پلی­پ Moreفرآیند تزریق پلاستیک، یکی از مهم­ترین روش­های شکل­دهی در صنعت تولید پلاستیک­ها می­باشد. جمع­شدگی و عدم­گردی پدیده­هایی هستند که کیفیت نهایی محصول را تحت تأثیر قرار می­دهند. در این تحقیق تأثیر ضخامت قطعه استوانه­ای از جنس پلی­پروپیلن بر میزان جمع­شدگی و عدم­گردی بررسی شده­است. بنابراین با استفاده از نرم­افزار MOLDFLOW، فرآیند تزریق پلاستیک برای جمعشدگی و عدم­گردی، شبیه­سازی و تحلیل می­شود. سپس یک قالب تزریق پلاستیک پنج­حفره­ای از قطعات استوانه­ای توخالی با پنج ضخامت مختلف ساخته شده و با استفاده از یک دستگاه تزریق پلاستیک، حداقل 5 نمونه از قطعات تولید می­شود. در ادامه ابعاد نمونه­های تولید شده توسط دستگاه اندازه­برداری سه­بعدی نوری اندازه­گیری شده و میانگین جمع­شدگی ابعادی هر نمونه به­دست می­آید. با انجام این تحقیق نتیجه می­گیریم که با افزایش ضخامت قطعه، میزان جمع­شدگی و عدم­گردی افزایش می­یابد و دلیل آن، آهسته­تر سرد شدن پلیمر مذاب با افزایش ضخامت قطعه و داشتن زمان بیشتر برای تشکیل بلور است. بلورینگی بیشتر ماده موجب جمع­شدگی و عدم­گردی زیادتری می­شود. در پایان نتایج شبیه­سازی با نتایج تجربی مقایسه می­شوند و مشاهده می­شود که که نتایج تجربی و نتایج شبیهسازی تطابق خوبی با هم دارند. Manuscript profile