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سنتز هیدروترمال و خواص نوری نانورنگدانه های CoAl2O4
پنجشنبه 16 مهر 1394 17:07
Hydrothermal synthesis and optical property of nano-sized CoAl2O4 pigment سنتز هیدروترمال و خواص نوری نانورنگدانه های CoAl 2 O 4 ABSTRACT Nano-sized CoAl2O4 was synthesized by hydrothermal method. The powder was characterized by XRD, DTA–TG, TEM, BET, IR, XPS, and UV–Vis techniques. The particle size was ca. 70...
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خوردگی داغ مواد : مکانیزم جریان سیال ؟
پنجشنبه 16 مهر 1394 17:02
? Hot corrosion of materials: a fluxing mechanism خوردگی داغ مواد : مکانیزم جریان سیال ؟ ABSTRACT Hot corrosion is the accelerated oxidation of a material at elevated temperature induced by a thin film of fused salt deposit. Fused Na2 S04 , which is the dominant salt involved in hot corrosion, is an ionic...
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مواد دما بالا برای توربین ها گازی
پنجشنبه 16 مهر 1394 16:59
: High Temperature Materials for Gas Turbines The Present and Future مواد دما بالا برای توربین ها گازی: حال و آینده ABSTRACT Increased operating temperatures and higher efficiency in gas turbines and jet engines can reduce CO2 emission, thus contributing to the prevention of global warming. To achieve this goal, it is...
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توزیع ناهمگن نانوکریستال های فلزی در لعاب کاری سفالینه ها
پنجشنبه 16 مهر 1394 16:54
Heterogeneous distribution of metal nanocrystals in glazes of historical pottery توزیع ناهمگن نانوکریستال های فلزی در لعاب کاری سفالینه های باستانی ABSTRACT It has been recently shown that lustre decoration of medieval and renaissance pottery consists of silver and copper nanocrystals, dispersed within the glassy...
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درصد گاز در ریخته گری دایکاست فشار بالا
پنجشنبه 16 مهر 1394 16:50
Gas content in high pressure die castings درصد گاز در ریخته گری دایکاست فشار بالا ABSTRACT This paper presents the results of a quantitative study of the gas level in various types of castings from the high pressure die casting (HPDC) process using a vacuum fusion method. It was found that the major part of the gas...
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تغییر فاز در فولادهای میکرو آلیاژ کم آلیاژ استحکام بالا (HSLA)
پنجشنبه 16 مهر 1394 16:48
Phase transformations in microalloyed high strength low alloy (HSLA) steels تغییر فاز در فولادهای میکرو آلیاژ کم آلیاژ استحکام بالا (HSLA) ABSTRACT The addition of small amounts of Nb, Ti or V singly or in combination has been the key to producing high strength low alloy (HSLA) steels with greatly improved mechanical...
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مواد عایق برق Electrical insulating materials
پنجشنبه 16 مهر 1394 16:42
Electrical insulating materials مواد عایق برق ABSTRACT Electrical insulating materials ensure the integrity of desired paths of electromagnetic power flow in electrical systems and equipment . They are materials at very high resistivity and can thus be used as isolators or separator between conductors having different...
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چقرمگی شکست اپوکسی اصلاح شده با لاستیک هیبریدی
پنجشنبه 16 مهر 1394 16:38
Fracture Toughness of a Hybrid Rubber Modified Epoxy. II. Effect of Loading Rate چقرمگی شکست اپوکسی اصلاح شده با لاستیک هیبریدی. II. اثر نرخ بارگذاری ABSTRACT Effect of loading rate on toughness characteristics of hybrid rubber-modified epoxy was investigated. Epoxy was modified by amine-terminated butadiene...
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اثر ترکیب روی بافت کریستالوگرافی در آلیاژهای AL-Li-Cu
پنجشنبه 16 مهر 1394 16:36
Effect of composition on crystallographic texture in hot-rolled Al-Li-Cu alloys اثر ترکیب روی بافت کریستالوگرافی در آلیاژهای AL-Li-Cu نورد گرم شده ABSTRACT The hot-rolling textures of ternary Al-Li-Cu alloys have been characterized to determine their effects on the yield strength anisotropy. The alloys used in the...
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مواد دی الکتریک Dielectric Materials
پنجشنبه 16 مهر 1394 16:30
Dielectric Materials مواد دی الکتریک ABSTRACT Dielectric materials refer to those having the basic electric Property Of being Polarized in the Presence of an electric Field and having an electrostatic field within Them under the state of polarisation .(polarisation here refers to the molecular aligment along the...
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خوردگی سرب و آلیاژهای سربی
پنجشنبه 16 مهر 1394 16:26
Corrosion of Lead and Lead Alloys خوردگی سرب و آلیاژهای سربی ABSTRACT LEAD has such a successful record of service in exposure to the atmosphere and to water that its resistance to corrosion by these media is often taken for granted. Underground, thousands of kilometers of lead-sheathed cable and lead pipe give...
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ممانعت کننده های خوردگی مس Copper Corrosion Inhibitors
پنجشنبه 16 مهر 1394 16:22
Copper Corrosion Inhibitors ممانعت کننده های خوردگی مس ABSTRACT Copper is metal that has a wide range of applications due to its good properties. It is used in electronics, for production of wires, sheets, tubes, and also to form alloys. Copper is resistant toward the influence of atmosphere and many chemicals,...
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ممانعت از خوردگی مس در محلول H2SO4 اشباع از O2
پنجشنبه 16 مهر 1394 16:19
Copper corrosion inhibition in O2-saturated H2SO4 solutions ممانعت از خوردگی مس در محلول H 2 SO 4 اشباع از O 2 ABSTRACT Corrosion inhibition of copper in O2-saturated 0.50 M H2SO4 solutions by four selected amino acids, namely glycine (Gly), alanine (Ala), valine (Val), or tyrosine (Tyr), was studied using Tafel...
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سیمان و بتن
پنجشنبه 16 مهر 1394 16:16
Concrete and Cement سیمان و بتن ABSTRACT Inorganic concretes are reviewed, emphasizing two major areas: construction concretes and high temperature (refractory) concretes. Although such materials are intended for completely different applications and markets, they have in common that they are made from inorganic...
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مواد کامپوزیت دی الکتریک
پنجشنبه 16 مهر 1394 16:13
Composite Dielectric Materials مواد کامپوزیت دی الکتریک ABSTRACT Composite dielectrics represent, in general, a heterogeneous system of multiconstituent materials. Typically, a two-phase composite dielectric is constituted by a host material with an inclusion of another material. This host-inclusion system could be...
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تولید رنگدانه قرمز از ساختار پروسکایت Y(Al,Cr)O3
پنجشنبه 16 مهر 1394 16:09
Colour development of red perovskite pigment Y(Al,Cr)O3 in various ceramic applications تولید رنگدانه قرمز از ساختار پروسکایت Y(Al,Cr)O 3 مورد مصرف در کاربردهای مختلف صنایع سرامیک ABSTRACT Ceramic pigments based on the perovskite structure develop a promising red hue and furthermore present no environmental or health...
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روش های پوشش دهی با استفاده از فلزات پلاتینی
پنجشنبه 16 مهر 1394 16:06
Coating Methods for Use with the Platinum Metals روش های پوشش دهی با استفاده از فلزات پلاتینی ABSTRACT There is now a wide variety of methods that can be employed to form coatings of the platinum group metals. The choice of materials and methods to be used can best be made after the manufacturer and the user of the...
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رس ها
پنجشنبه 16 مهر 1394 16:03
Clays رس هـا ABSTRACT Clays are ubiquitous constituents of the Earth’s crust that serve as raw materials for traditional ceramics. Mineralogically, clays are phyllosilicates or layered aluminosilicates. Bonding is strong within layers, but weak between layers, allowing clays to break into micrometer-sized particles....
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بنزوتریازول: یک ممانعت کننده مؤثر خوردگی برای آلیاژهای مس
پنجشنبه 16 مهر 1394 16:01
Benzotriazole:An effective corrosion inhibitor for copper alloys بنزوتریازول: یک ممانعت کننده مؤثر خوردگی برای آلیاژهای مس ABSTRACT Copper is the only engineering metal that is noble metal. It resists many corrosive environments. But copper tarnish or corrodes under some circumstances. In recent years, investigators...
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روشی برای مسطح سازی جبهه انجمادی در فن آوری انجماد جهت دار
پنجشنبه 16 مهر 1394 15:57
A method for flattening the solidification fron tindirectional solidification technology روشی برای مسطح سازی جبهه انجمادی در فن آوری انجماد جهت دار ABSTRACT Nonplanar solidification front causes defects in directional solidification process.The transverse temperature gradient,which can bedivided into radial...
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پوشش های آلومینیمی : شرح و سنجش
پنجشنبه 16 مهر 1394 15:54
Aluminum Coatings: Description and Testing پوشش های آلومینیمی : شرح و سنجش ABSTRACT Pure aluminum, the 3xxx, 5xxx, and most 6xxx series alloys, are sufficiently resistant to be used in industrial atmospheres and waters without any protective coatings. Coatings are recommended for the higher strength 6xxx alloys, such...
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آلومینات ها Aluminates
پنجشنبه 16 مهر 1394 15:38
Aluminates آلومینات ها ABSTRACT Aluminates form in binary systems with alkali, alkaline earth or rare-earth oxides and share the high melting point and resistance to chemical attack of the pure Al2O3 end-member. This means that these ceramics have a variety of applications as cements, castable ceramics, bioceramics,...
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آلومینا Alumina
پنجشنبه 16 مهر 1394 15:33
Alumina آلومینا ABSTRACT The uses, processing, structure, and properties of alumina are summarized in this article. Various polymorphs of alumina and its phase relations with other oxides are described. The following properties are discussed: mechanical, thermal, thermodynamic, electrical, diffusional, chemical, and...
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مروری بر مزایا و محدودیت های HPT
پنجشنبه 16 مهر 1394 15:25
Advantages and limitations of HPT: a review مروری بر مزایا و محدودیت های HPT ABSTRACT The improvements in the design of the HPT tools lead to a well defined torsiondeformation and permits, therefore, a comparison with other SPD-techniques. The design of thetools, the advantages and disadvantages of HPT, as well as the...
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مطالعه های تئوری بر روی بازدارنده های خوردگی مس در اسید نیتریک
پنجشنبه 16 مهر 1394 14:35
A theoretical study on the inhibition efficiencies of some quinoxalines as corrosion inhibitors of copper in nitric acid مطالعه های تئوری بر روی بازده های بازدارندگی چند مورد از کویناگزالات ها به عنوان بازدارنده های خوردگی مس در اسید نیتریک ABSTRACT Quantum chemical calculations based on DFT method were performed...
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یک بازدارنده خوردگی جدید برای محافظت مس
پنجشنبه 16 مهر 1394 14:32
A new corrosion inhibitor for copper protection یک بازدارنده خوردگی جدید برای محافظت مس ABSTRACT Methyl 3-((2-mercaptophenyl)imino)butanoate (MMPB) was synthesized as inhibitor compound for copper protection. The molecule was designed with azole, thiol functional groups and carboxylate tail group. The inhibition...
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مطالعه امکانپذیری فرآیند ریخته گری تحت فشار در خلأ
پنجشنبه 16 مهر 1394 14:30
A feasibility study of the partial squeeze and vacuum die casting process مطالعه امکانپذیری فرآیند ریخته گری تحت فشار در خلأ و انقباض جزئی ABSTRACT A feasibility study of the partial squeeze and vacuum die casting process was performed to make defect-free casting products with excellent mechanical properties. The...
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بازدارنده های جدید برای خوردگی مس
پنجشنبه 16 مهر 1394 14:19
New inhibitors for copper corrosion بازدارنده های جدید برای خوردگی مس ABSTRACT The study of the effectiveness of several potential copper corrosion inhibitors in acidic media was studied. The investigated thiazole derivative functional groups contain heterocyclic atoms such as nitrogen, sulfur, and oxygen. Thiazole...
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مرکپتوبنزواکسازول بعنوان بازدارنده ی خوردگی مس در محیط کلریدی
پنجشنبه 16 مهر 1394 14:16
: Mercaptobenzimidazole as a copper corrosion inhibitor Long-term immersion, 3D-profilometry, and electrochemistry مرکپتوبنزواکسازول بعنوان بازدارنده ی خوردگی مس در محیط کلریدی: الکتروشیمی، پروفیل سنجی سه بعدی، آنالیز سطحی XPS ABSTRACT The high corrosion inhibition effectiveness of 2-mercaptobenzimidazole (MBIH) in 3...
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پوشش های هوشمند خود تمیز شونده جهت حفاظت از اکسیداسیون
پنجشنبه 16 مهر 1394 14:13
Smart self-cleaning coatings for corrosion protection پوشش های هوشمند خود تمیز شونده جهت حفاظت از اکسیداسیون ABSTRACT Self-cleaning surfaces have attracted signifi cant attention in recent years for their potential in both fundamental research and practical applications. Under the scope of self-cleaning smart...