نتایج جستجو برای: استاندارد astm e756 05
تعداد نتایج: 120254 فیلتر نتایج به سال:
The ASTM Acid Number (AN) and Base Number (BN) analyses provide two of the most fundamental condition monitoring measures associated with lubricant quality, providing status information on oil oxidation and/or reserve alkalinity, respectively. Although a crucial measure, the various ASTM titrimetric methods are expensive and problematic to carry out as well as being difficult to compare and int...
The Fe66Cr10Nb5B19 alloy coatings with high hardness (≈850 HV300), low porosity (less 3 %), content of crystalline phase 2.5 wt.%), elevated nanohardness (average value 13.7 GPa), and wear resistance were obtained in a wide range detonation spraying modes. results dry linearly reciprocating sliding tests carried out according to ASTM G 133-05 are presented. at an explosive charge 50 – 70 % is s...
We used magnetoencephalography (MEG) to examine brain activity related to the maintenance of non-verbal pitch information in auditory short-term memory (ASTM). We focused on brain activity that increased with the number of items effectively held in memory by the participants during the retention interval of an auditory memory task. We used very simple acoustic materials (i.e., pure tones that v...
The aim of the present study was to compare the accuracy of the Amsterdam Short Term Memory (ASTM) test with that of the Structured Inventory of the Malingered Symptomatology (SIMS) in detecting feigning of cognitive dysfunction in naïve and coached participants. Ninety undergraduate students were administered the ASTM and the SIMS and asked to respond honestly (controls; n = 30), or instructed...
All components have performance limitations. These limitations are due to part design, part misuse, manufacturing practices and material characteristics. Non-destructive examination is specified by designers and users to ensure that the component purchased does not have features that would limit the component performance to less than the design requirement. Radiography can be used to detect int...
محققان بسیاری در جهان اثر استفاده از سبکدانه های مصنوعی و طبیعی را در خصوصیات بتن بررسی کرده اند. اما با توجه به تنوع نسبتاً زیاد سبکدانه ها و اینکه اکثر تحقیقات صورت پذیرفته نشان از عدم دستیابی مطمئن به بتن های سبکدانه سازه ای با استفاده از سبک دانه های موجود داخل کشور دارند، نیاز به تحقیق بیشتر در مورد بتن های سبکدانه سازه ای حاوی پرلیت، لیکا و پومیس تولید داخل کشور احساس می شود. به همین دلیل ...
کامپوزیتها شاخه مهمی از مواد پیشرفته مهندسی هستند که به دلیل داشتن ویژگیهای منحصر به فردی به طور گسترده در صنعت از آنها استفاده میشود. در این مواد امکان وقوع انواع خرابیها وجود دارد. جدایش بینلایهای یکی از شایعترین انواع خرابی در چندلایههای کامپوزیتی بوده که در انواع بارگذاریهای مود I، II یا ترکیبی از این مودها اتفاق میافتد. در پژوهش حاضر، به بررسی رفتار مکانیکی و نشرآوایی جدایش بین...
A desire to increase automation or to eliminate the use of mercury has prompted several ASTM committees to consider alternatives to ASTM Liquid-in-Glass (LiG) thermometers. In this paper, we address the technical issues of choosing an alternative. We first discuss the basic properties and relative merits of platinum resistance thermometers, thermistors, and thermocouples in the context of repla...
In this research (using induction furnace process) nodular iron with three different percentages of copper (residual, 0.5% and 1,2%) was obtained. Chemical analysis was performed by mass spectrometry and microstructures were characterized by Optical Microscopy (ASTM E3) and Scanning Electron Microscopy (SEM). The study of mechanical behavior was carried out in a mechanical test machine (ASTM E8...
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