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مواد فانتوم الکترومغناطیس
سهشنبه 21 مهر 1394 13:09
Electromagnetic Phantom Material مواد فانتوم الکترومغناطیس ABSTRACT A state-of-the-art intrest in electromagnetic research is to elucidate and characterize the interaction between nonionizing radiations versus living systems . The purpose is three fold : (1) To understand the mechanism(s) of interactions involved (۲)...
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مواد سرامیکی و پلیمری دارای مواد رسانا
سهشنبه 21 مهر 1394 11:42
Conductor-Loaded Polymeric and ceramic Material مواد سرامیکی و پلیمری دارای مواد رسانا (دارای ذرات تقویت کننده رسانا) ABSTRACT Conductor-filled polymers and ceramic are specific subsets of the conductor-Loaded dielectrics . The primary reason for adding conducting particles in polymers plastics or ceramics is to...
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مواد پلیمری رسانا
سهشنبه 21 مهر 1394 10:41
Conducting Polymeric Materials مواد پلیمری رسانا ABSTRACT A highly conjugated organic polymer ( having unsaturated bonds spaced along the polymer chain intermittently ) such as polyacetylene has been known to exhibit high electronic conductivity when oxidized by suitable reagents . Likewise a number of conjugated...
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مواد محافظ الکترومغناطیسی
سهشنبه 21 مهر 1394 09:01
Electromagnetic Shieldig Materials مواد محافظ الکترومغناطیسی ABSTRACT Electromagnetic Shieldig Materials are the structural constituents of the so-called electromagnetic Shields used for the purpose of confining electromagnetic energy within the bounds of a specific region and/or to prevent the proliferation of such...
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نانومرکب های سرامیکی برای چاپگرهای چهاررنگه جوهرافشان
دوشنبه 20 مهر 1394 17:02
Nano-sized Ceramic Inks for Drop-on-Demand Ink-Jet Printing in Quadrichromy نانومرکب های سرامیکی برای چاپگرهای چهاررنگه جوهرافشان drop-on-demand (با فناوری چکانش روی موضع موردنظر) ABSTRACT Nano –sized ceramic inks suitable for ink –jet printing have been developed for the four-colours CMYK ( cyan ، magentah ، yellow...
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سنتز پودر ZrB2بوسیله احیا حرارتی بور
دوشنبه 20 مهر 1394 10:40
ZrB2 Powders Synthesis by Borothermal Reduction سنتز پودر ZrB 2 بوسیله احیا حرارتی بور ABSTRACT IHigh-purity zirconium diboride (ZrB2) powders with submicrometer particle size were synthesized by borothermal reduction of nanometric ZrO2 powders in vacuum. The reaction process was experimentally and thermodynamically...
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سرامیک های فوق دمابالا جهت کاربرد در محیط های سرسخت
دوشنبه 20 مهر 1394 10:37
Ultra-High Temperature Ceramic Materials for Extreme Environment Applications سرامیک های فوق دمابالا جهت کاربرد در محیط های سرسخت ABSTRACT For the purposes of this paper, we will simply define UHTC materials by their usefulness in a real structural (load-bearing) application where the very high temperatures are...
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مینرال های گروه سیلیمانیت؛ سیلیمانیت، کیانیت و آندالوزیت
یکشنبه 19 مهر 1394 11:29
The Sillimanite Minerals: Andalusite, Kyanite, and Sillimanite مینرال های گروه سیلیمانیت؛ سیلیمانیت، کیانیت و آندالوزیت ABSTRACT The chemistry and the mineralogy of the three Al2O3.SiO2 sillimanite minerals (anadlusite, kyanite, and sillimanite) are described. Their P–T diagram is discussed. The structural...
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زیرکنیا
یکشنبه 19 مهر 1394 11:26
Zirconia زیرکنیا ABSTRACT Zirconia is a very important industrial ceramic for structural applications because of its high toughness, which has proven to be superior to other ceramics. In addition, it has applications making use of its high ionic conductivity. The thermodynamically stable, room temperature form of...
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سیلیس و کوارتز
یکشنبه 19 مهر 1394 10:33
Quartz and Silicas سیلیس و کوارتز ABSTRACT Silica is the most ubiquitous mineral in the earth’s crust, existing in a wide variety of crystalline and noncrystalline forms due to the flexibility of the linkage among SiO4 tetrahedra. The thermodynamically stable, room temperature form of silica is quartz, which is itself...
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اکسیدهای دیرگداز
یکشنبه 19 مهر 1394 10:32
Refractory Oxides اکسیدهای دیرگداز ABSTRACT Refractory oxides encompass a broad range of unary, binary, and ternary ceramic compounds that can be used in structural, insulating, and other applications. The chemical bonds that provide cohesive energy to the crystalline solids also influence properties such as thermal...
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مولایت
یکشنبه 19 مهر 1394 09:46
Mullite مولایت ABSTRACT Mullite is the only stable intermediate phase in the alumina–silica system at atmospheric pressure. Although this solid solution phase is commonly found in human-made ceramics, only rarely does it occur as a natural mineral. Yet mullite is a major component of aluminosilicate ceramics and has...
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ترکیبات حاوی سرب Lead Compounds
یکشنبه 19 مهر 1394 09:45
Lead Compounds ترکیبات حاوی سرب ABSTRACT Lead compounds include over forty naturally occurring minerals from which five lead oxides can be derived. The lead oxides, as well as some lead silicates, are used as raw materials in lead-containing glasses and crystalline electronic ceramics. The presence of lead in glass...
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تهیه پودر ZrB2با اندازه نانو بوسیله سنتز خود انتشار دما بالا
یکشنبه 19 مهر 1394 08:43
Preparation of nano-size ZrB2 powder by self-propagating high-temperature synthesis تهیه پودر ZrB 2 با اندازه نانو بوسیله سنتز خود انتشار دما بالا ABSTRACT Preparation of nano-size ZrB2 powder via SHS was demonstrated by adding 10–۵۰ wt.% NaCl into Zr–B elemental starting powder. Reactions took place completely even...
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آماده سازی سرامیک های دی براید زیرکونیوم
یکشنبه 19 مهر 1394 08:13
Preparation of zirconium diboride ceramics by reactive spark plasma sintering of zirconium hydride–boron powders آماده سازی سرامیک های دی براید زیرکونیوم به کمک واکنش سینتر کردن پلاسمای جرقه ایِ پودرهای هیدرید زیرکونیوم-بور ABSTRACT Monolithic ZrB2 ceramics were prepared by reactive spark plasma sintering of a ZrH2–B...
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ابزار جوشکاری اصطکاکی اغتشاشی friction stir welding tools
شنبه 18 مهر 1394 18:06
friction stir welding tools ابزار جوشکاری اصطکاکی اغتشاشی ABSTRACT Friction stir welding (FSW) is a widely used solid state joining process for soft materials such as aluminium alloys because it avoids many of the common problems of fusion welding. Commercial feasibility of the FSW process for harder alloys such as...
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نورد و پوشش دهی سطحی فولاد
شنبه 18 مهر 1394 17:37
ROLLING AND SURFACE COATING OF STEEL نورد و پوشش دهی سطحی فولاد ABSTRACT Steel, an alloy of carbon and iron, is a material which is both inexpensive and has great mechanical strength. However, it is initially produced as steel slabs which are too thick and heavy to be used. To convert the steel into useful products it...
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سرامیک های ابررسانا
شنبه 18 مهر 1394 17:02
Superconductive Ceramic سرامیک های ابررسانا ABSTRACT Since the discovery of superconductivity in mercury in 1911 by kamerlingh Onnes superconductivity was found in many other metals and in an extremely large number of metallic alloys and compounds . The highest temperature of the transition to the superconducting...
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سنتز صفحات زیرکونیوم براید از مخلوط پودر ZrCl4 و B فعال شده به صورت مکانیکی
شنبه 18 مهر 1394 12:48
Synthesis of zirconium diboride platelets from mechanically activated ZrCl4 and B powder mixture سنتز صفحات زیرکونیوم براید از مخلوط پودر ZrCl 4 و B فعال شده به صورت مکانیکی ABSTRACT In summary, the platelet-like ZrB2 particles were successfully prepared by the mechanochemical processing of a ZrCl4– B mixture and...
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تأثیر دما بر خوردگی Cu/HNO3 در حضور ممانعت کننده آلی
شنبه 18 مهر 1394 10:51
The Effect of Temperature on the Corrosion of Cu/HNO3 in the Presence of Organic Inhibitor تأثیر دما بر خوردگی Cu/HNO 3 در حضور ممانعت کننده آلی ABSTRACT The effect of temperature on the corrosion behaviour of copper in 2M nitric acid solution in the presence and absence of...
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معرفی و بررسی شکست
شنبه 18 مهر 1394 10:12
Introduction and fracture over view معرفی و بررسی شکست ABSTRACT In this chapter ، a fundamental approach to fracture will be followed in order to develop a few central ideas about why any given material is ductile or brittle ، and how the basic lattic defects of the material cooperate to give rise to these two general...
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اثر کار مکانیکی اولیه بر ساختار و ظرفیت تغییرشکل
پنجشنبه 16 مهر 1394 17:47
EFFECT OF PRIOR WORKING ON THE STRUCTURE AND DEFORMATION CAPACITY اثر کار مکانیکی اولیه بر ساختار و ظرفیت تغییرشکل آلیاژ Mn-29.5%Al-0.5%C ABSTRACT Alloys based on the system Mn–AI–C relate to promising magnetically hard materials which in magnetic properties in an anisotropic state are close to barium ferrites, and in...
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مواد کامپوزیت دی الکتریک با یک فاز رسانای گسسته
پنجشنبه 16 مهر 1394 17:42
composite dielectric materials with a Discrete conducting phase مواد کامپوزیت دی الکتریک با یک فاز رسانای گسسته ABSTRACT A class of composite dielectric materials refers to a two-phase refer ، host inclusion system in which the inclusion is a discrete- phase of conducting medium ( such as metals ، semiconductors ، or...
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تولید زیرکنیای تثبت شده با ایتریا به کمک تفجوشی مایکروویو
پنجشنبه 16 مهر 1394 17:39
Microwave synthesis of yttria stabilized zirconia تولید زیرکنیای تثبت شده با ایتریا به کمک تفجوشی مایکروویو ABSTRACT Yttria stabilised zirconia (YSZ) nanocrystals, with a mean size between 5 and 10 nm, were prepared by microwave flash synthesis. Flash synthesis was performed in alcoholic solutions of yttrium,...
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مشخصه یابی ریزساختاری آلیاژ Al-8Fe-1.4V-8Si تحت ریخته گری
پنجشنبه 16 مهر 1394 17:35
Microstructural characterization of squeeze-cast Al–8Fe–1.4V–8Si مشخصه یابی ریزساختاری آلیاژ Al-8Fe-1.4V-8Si تحت فرایند ریخته گری فشاری ABSTRACT This paper investigates the effect of vanadium on the composition and morphology of intermetallics formed during the squeeze casting of Mgmodified Al–8Fe–1.4V–8Si alloy in...
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اصول پیش بینی عمر سرویس دهی سیستم های پوششی
پنجشنبه 16 مهر 1394 17:31
Methodologies for Predicting the Service Lives of Coating Systems اصول پیش بینی عمر سرویس دهی سیستم های پوششی ABSTRACT Over the last two decades the organic coatings industry has undergone rapid technological and structural changes. these changes has been induced by legislative actions such as restriction pertatining...
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سیلان مواد در طول جوشکاری اصطکاکی اغتشاشی Ti-6Al-V
پنجشنبه 16 مهر 1394 17:22
Material Flow During Friction Stir Welding of Ti-6Al-4V سیلان مواد در طول جوشکاری اصطکاکی اغتشاشی Ti-6Al-V ABSTRACT 6 mm thick Ti-6Al-4V butt joints were produced with a tracer material embedded in the joint under a variety of process conditions, namely rotational speed and traversing speed, in an attempt to relate...
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اتصال با استفاده از تغییرشکل پلاستیک
پنجشنبه 16 مهر 1394 17:17
Joining by plastic deformation اتصال با استفاده از تغییرشکل پلاستیک ABSTRACT Vehicles such as aircraft and cars comprise a large number of mechanical parts produced by a variety of manufacturing processes. Cars generally consist of 10,000–30,000 parts, and the number of parts in aircraft is counted in millions. A...
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بازدارندگی مس به وسیله 3،2،1، بنزوتریازول
پنجشنبه 16 مهر 1394 17:14
Inhibition of copper corrosion by 1,2,3-benzotriazole بازدارندگی مس به وسیله 3،2،1، بنزوتریازول ABSTRACT Benzotriazole (BTAH) has been known for more than sixty years to be a very effective inhibitor of corrosion for copper and its alloys. In spite of numerous studies devoted to the investigation of BTAH action, the...
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جوشکاری اصطکاکی لحظه ای (IFW) برای کاربردهای هوافضا
پنجشنبه 16 مهر 1394 17:11
Inertia friction welding (IFW) for aerospace applications جوشکاری اصطکاکی لحظه ای (IFW) برای کاربردهای هوافضا ABSTRACT The use of inertia welding in the aerospace industry has been steadily increasing owing to the signifi cant improvements it provides in joint quality, compared with the use of fusion...