توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Synthesis of Al–CNT Nanocrystalline–Nanocomposite Powder Particles by Mechanical Milling
نویسنده(ها): ، ،
اطلاعات انتشار: همایش ملی نانو مواد و نانو تکنولوژی، سال
تعداد صفحات: ۶
In this paper mechanical alloying was used for dispersing different content of carbon nanotube in Al6061 powder particles. The effect of milling time and process parameters on morphology, particle size distribution and decreasing rate of powder particle size (K) during milling was quantified by scanning electron microscopy (SEM) and laser particle size analyzer. It was concluded that by 4h milling of Al–5wt%CNT powder mixture a homogeneous distribution of CNT in flattened Al powder particles could be achieved. Particle size distribution results showed that the average particle size (D50) decreased by increasing milling time and CNT content. It was also shown
that increasing milling time and decreasing CNT content decreased K index. In addition X–Ray diffraction studies revealed that nanocrystalline aluminum powder particles could be achieved by milling of powder mixture for optimum milling time.<\div>

۲Introduction of Monitoring and Diagnosis as a Basis for Asset Management on Power Transformers using Advanced Intelligent Systems
نویسنده(ها): ، ، ،
اطلاعات انتشار: بیست و چهارمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۱
Power transformers are one of the most significant components of electric networks. These devices are very expensive and therefore diagnosis and monitoring systems will be valuable for preventing damage to these transformers. The aim of this contribution is to study the current situation in monitoring and diagnostic systems for power transformers and introducing new techniques and technologies that will be useful for this purpose. An example of a system also will be presented<\div>

۳Preparation of Polysulfone nano–structured membrane for removal metal ions from water
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس بین المللی تصفیه فاضلاب و بازیافت آب، فناوری ها و یافته های نو، سال
تعداد صفحات: ۷
Polysulfone nanofiltration (NF) membranes with higher pore size and higher charge density are capable of removing metal ions from water. Therefore the present study concerns the graft–modification of ultrafiltration (UF) membranes by UV irradiation. UF membranes were prepared via phase inversion method. Polyethylene glycol (PEG) with molecular weights 1500, 3000 and 4000 gr\mol was used in casting solution as comparatively big sized pore former. Effect of grafting conditions including monomer concentration and irradiation time on membrane performance properties as pure water flux (PWF) and salt rejection were studied. FTIR–ATR, SEM and AFM were employed to characterize the chemical and structural changes on the modified membrane surface. The result showed PWF significantly declines and salt rejection improves with increase in both graft irradiation time and monomer concentration. At 25 °C, PWF of this prepared NF membrane is 13.26 m3.m–2.h–1 at 300 kPa. The rejection to different salt solutions follows the decreasing order of Na2SO4 (96.3%), MgSO4 (58.8 %), NaCl (51 %) and CaCl2 (28.6%). The RMS roughness of this membrane is 1.65 nm which is NF membrane properties range<\div>

۴An investigantion on Windings in New Generation of Synchronous Generators Based on XLPE Cable Known as Powerformers
نویسنده(ها): ، ،
اطلاعات انتشار: پنجمین کنفرانس بین المللی پیشرفتهای علوم و تکنولوژی، سال
تعداد صفحات: ۷
Nowadays cable wound synchronous generators known as powerformers has been applied in modern power plants. Winding of them is so different compared to conventional winding used in customary synchronousgenerators. In this paper, the winding of them has been investigated and two appropriate wiring for armature winding has been presented. Then the advantages and disadvantages of them have been studied and one of them has been suggested. Finally analysis and simulation of a sample powerformer that used introduced wiring, based on finite element method has been done. The obtained results show the accuracy of claim<\div>

۵EXPERIMENTAL STUDY ON BUBBLE DEPARTURE DIAMER OF MONOETHYLENEGLYCOL AQUEOUS SOLUTIONS
نویسنده(ها): ، ،
اطلاعات انتشار: دومین همایش ملی تکنولوژی های نوین در شیمی و پتروشیمی، سال
تعداد صفحات: ۹
Nucleate pool boiling heat transfer experiments were conducted on a smooth horizontal cylinder at atmospheric pressure. Water\MEG (monoethyleneglycol) binary solutions were used as the testing fluid. A high–speed digital video camera was applied to capture the dynamics of the bubble nucleation process. Bubble dynamics is the most important sub–phenomenon, which basically affects the nucleate pool boiling heat transfer coefficient. In this article, extensive new experimental data at atmospheric pressure are presented for bubble departure diameters during saturated pool boiling for Water\MEG binary solutions in various concentrations and heat fluxes. For all test fluids, experimental results show that bubble diameter increases with increasing heat flux. In addition, experimental data have shown that ,in concentrations of less than 8% MEG, the boiling heat transfer coefficient in mixtures of water\monoethyleneglycol is even higher than the boiling heat transfer coefficient of water.<\div>
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