Materials Literature
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A new magnetocell, based on a plate-plate twin gap with housing and integrated online flux density measurement, allows for a reliable rheological characterization of magneto¬rheological fluids (MRF). Various modifications introduced into the commercial magnetocell version MRD180/1T (Physica/Anton Paar), distinctly imp…
خصوصیات لایه کاربیدی که بر روی فلزات و آلیاژها از طریق روش نفوذ فعال حرارتی (TRD) به وجود میآید شامل مقاومت به سایش، اکسیداسیون، خوردگی و نیز افزایش سختی سطح آنها میباشد. در تحقیق حاضر، سینتیک تشکیل لایه کاربید کروم بر روی فولاد 1020 AISI کربن داده شده، با استفاده از روش حمام نمک مذاب در دماهای 900، 1000 و ºC1100 به…
This article reports viscosity data on a series of colloidal dispersions collected as part of the International Nanofluid Property Benchmark Exercise (INPBE). Data are reported for seven different fluids that include dispersions of metal-oxide nanoparticles in water, and in synthetic oil. These fluids, which are also…
در فرآیند تولید، نرمال کردن معمولاً پس از عملیات آهنگری و قبل از عملیات کوئنچ و تمپر بر روی قطعات صنعتی انجام میشود. این عملیات موجب یکنواخت و ریز شدن ریزساختار میگردد. با توجه به تأثیر کم عملیات نرماله بر خواص مکانیکی فولاد Ck45 آهنگری، کوئنچ و تمپرشده و ضرورت کاهش هزینههای تولید، حذف این عملیات پس از آهنگری مطلوب…
در این تحقیق خواص و رفتار مکانیکی کامپوزیتهای ذره ای زمینه فلزی بر پایه آلیاژ یوتکتیکی Si 12%Al- و ذرات تقویت کننده TiC Al2O3 و B4C ساخته شده به روش ریختهگری گردابی در شرایط مختلف مورد بررسی قرار گرفته است. از پارامترهای مورد بررسی می توان به درصد ذرات استحکام دهنده، دمای ریختن مذاب، سرعت و زمان هم زدن مذاب و نوع هم…
خوردگی حفرهای فولاد در بتن یکی از دغدغههای اساسی مهندسان عمران در بهرهبرداری بهینه از سازههای مسلح شده بتنی در محیطهای آبی میباشد. معرفی روشی سهل و مطمئن برای پیشبینی امکان وقوع خوردگی حفرهای مورد توجه محققان خوردگی بوده است. هدف از تحقیق حاضر مقایسه مقادیر پتانسیل حفرهدار شدن اندازه گیری شده از روشهای پلاری…
The yield stress of a magnetorheological fluid was measured as a function of magnetic flux density using different techniques. The yield stress values were determined by extrapolating the experimental shear stress-shear rate data to zero shear rate with the help of Bingham and Herschel-Bulkley models, and by using str…
An enhanced version of the flexure-based microgap rheometer (FMR) is described which enables rheological measurements in steady state shearing flows of bulk fluid samples of PDMS with an absolute gap separation between the shearing surfaces of 100 nm - 100 mm. Alignment of the shearing surfaces to a parallelism better…
We present a model for osmotic pressure and shear modulus of highly concentrated emulsions by including the interdroplet interaction in terms of disjoining pressure. The results show that even a small addition in interdroplet interaction can lead to significant deviations from the classical Princen-Lacasse-Mason model…
Abstract Due to swelling, smectite minerals are capable of intercalating many organic molecules in their interlayer space. Tetracycline (TC) is a group of antibiotics used extensively in human and veterinary medicine. The great aqueous solubility and long environmental half life of TC mean that the study of interactio…
A rich variety of chalcogenidoarsenate anions and ligands have been prepared under mild solvothermal conditions in strongly polarizing solvents such as water, methanol and amines in the temperature range 100 - 200 ◦C. This review covers synthetic and structural aspects of such species A Sx E y z− with particular empha…
We present a design for metamaterial absorber which is resonant with strong absorbance in the microwave frequency range. Our fabricated design consists of two resonators and a metal wire that couple separately so as to absorb all incident electric and magnetic fields within a single planar layer which is only 0.9 mm t…
The application of the Hf isotope composition of zircon as a geochemical tracer requires the preservation of Lu-Hf systematics within individual grains. We performed hydrothermal experiments on a self-irradiation-damaged zircon to test whether hydrothermal alteration would affect its Hf isotopic composition. Severely…
Editorial, Preface of Special Issue devoted to 10th Brazilian Polymer Congress
Hand in hand with the integration increase of the up-to-date radio electronic equipment (REE) there grows substantially its design complexity, which is associated with an increase in the dimension of the problems solved in the development process. The application of SAD SolidWorks is an effective way to solve this pro…
Asymptotic solutions are derived for two new theory elasticity problems with mixed boundary conditions. The first problem is about a shear crack in a strip for different types of boundary conditions on the outer faces of the strip. The second one is the contact problem for a three-dimensional wedge when a concentrated…
A new marketing paradigm with appropriate instruments of its implementation in engineering activity is presented. Engineering marketing complex as a set of variables for the efficiency engineering; engineering marketing business model executed with the help of psychoheuristic programming is described.