Monolithic

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1 - طراحی تقویت کننده یک طبقه توان بالا و فرکانس بالا در کلاس F با دو ترانزیستور موازیGaN برای کاربردهای 2.5GHz
باقر ذبیحی پیمان علیپرست ناصر نصیرزاده

10.30495/jce.2022.690399

در این مقاله یک تقویت‌کننده توان فرکانس بالا در کلاس F مبتنی بر تکنولوژی مدار مجتمع مایکروویو یکپارچه(MMIC)طراحی شده است. برای این طرح از پروسه گالیم نیترات با قابلیت تحرک الکترون بالا با فناوری طول گیت 150 نانومتر استفاده شده است. فرکانس مرکزی تقویت‌کننده 2/5 گیگا هرتز أکثر

در این مقاله یک تقویت‌کننده توان فرکانس بالا در کلاس F مبتنی بر تکنولوژی مدار مجتمع مایکروویو یکپارچه(MMIC)طراحی شده است. برای این طرح از پروسه گالیم نیترات با قابلیت تحرک الکترون بالا با فناوری طول گیت 150 نانومتر استفاده شده است. فرکانس مرکزی تقویت‌کننده 2/5 گیگا هرتز است. بیشترین گین توان تقویت‌کننده مورد نظر تقریبا برابر با dB12/76 است و در یک طبقه طراحی شده است. در فرکانس مورد نظر بیشترین توان خروجی تقویت کننده توان حدود dBm39/196 در توان ورودی dBm30 است. در بیشترین توان خروجی ، PAE حدود 41/25% است که بیشترین مقدار خود را دارد. مساحت نهایی مدار برای جاسازی بر روی تراشه 25/903 میلیمتر در19/346 میلیمتر است. بیشترین مقدارAM/PM و AM/AM به ترتیب برابر dB/deg2/38 و dB/dB1/66 است. برای تقویت‌کننده اعوجاج تداخلی هارمونیک سوم (IMD3) حدود dBc-20 در فرکانس مرکزی است. برای طراحی این تقویت‌کننده از تحلیل Loadpull نرم افزار ADS برای بدست آوردن توان خروجی مناسب استفاده شده است. تفاصيل المقالة

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2 - A W-band Simultaneously Matched Power and Noise Low Noise Amplifier Using CMOS 0.13µm
Mahmoud Mohammad-Taheri

A complete procedure for the design of W-band low noise amplifier in MMIC technology is presented. The design is based on a simultaneously power and noise matched technique. For implementing the method, scalable bilateral transistor model parameters should be first extr أکثر

A complete procedure for the design of W-band low noise amplifier in MMIC technology is presented. The design is based on a simultaneously power and noise matched technique. For implementing the method, scalable bilateral transistor model parameters should be first extracted. The model is also used for transmission line utilized in the amplifier circuit. In the presented method, input/output matching networks and transistor gate width have been optimized for simultaneous maximum gain and minimum noise figure. It is easily shown that due to the low gain property of amplifier at high frequency, it is unconditionally stable; so, the common source topology has superior performance compared to other topologies. In addition, better noise figure, lower size and higher gain with the same power consumption can be achieved compared with those of the cascode topology. The simulation results show a gain of better than 18dB and noise figure of 7.4dB at 94GHz while input/output return losses are better than 20dB تفاصيل المقالة

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3 - The Effect of Vertical Component of Earthquake on Continuous and Monolithic Frame Bridges
A Delnavaz A Rahaee

Performance of structures during recent earthquakes shows that the effect of vertical component of earthquake (VCE) could be considered as one of the main causes of bridges collapse. In most of bridge design codes, for seismic analysis of bridges, VCE is not taken into أکثر

Performance of structures during recent earthquakes shows that the effect of vertical component of earthquake (VCE) could be considered as one of the main causes of bridges collapse. In most of bridge design codes, for seismic analysis of bridges, VCE is not taken into account or a distinguished method isn’t presented for assessment of VCE. In the present work, the effect of VCE on two existing bridges, one with continuous deck and the other with monolithic frame system, was studied. The first model consisted of a pre-stress bridge in which the superstructure was connected rigidly to piers. The super structure consisted of 3 spans with length of 16, 48 and 16 m. The end of side slabs was put on abutments. The second model was a bridge with steel deck and concrete piers. The bridge superstructure was composed of I girder beams and in-place concrete slab. The beams were placed on 3 piers located 24 m far from each other, continually. In both models, the effect of VCE was studied considering the 3 acceleration of Tabas, Northridge and Kobe earthquakes and using linear and nonlinear time history and spectrum analysis on 3D models. In each analysis, the model was analyzed considering the 3 component and 2 horizontal components of earthquakes separately. The ratio of the difference of results in two analyses to the result of bridge response under its weight (DL) was compared. Through this method the amount of VCE effect on affected elements (according to statistical system of bridge) was found out. تفاصيل المقالة

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4 - Recent Advancement in monolithic refractories via application of Nanotechnology “A review”
salamn ghasemi hassan gheisari ali nemati

10.22034/jna.2018.568460.1091

Abstract:In recent years, the use of nanotechnology (nano-particles, nanomaterial, nano-additives and nano- structured materials) has attracted attention of scholars, engineers and scientists in all scientific fields such as chemistry, medicine, material, agriculture, e أکثر

Abstract:In recent years, the use of nanotechnology (nano-particles, nanomaterial, nano-additives and nano- structured materials) has attracted attention of scholars, engineers and scientists in all scientific fields such as chemistry, medicine, material, agriculture, electronic etc. The use of nanotechnology has also become widespread in the refractory products (which mainly used in various industries such as steel, casting, cement, glass etc.). Therefore, the effect of using different types and contents of nanomaterials (oxides and non-oxides) as well as the control of microstructure has been evaluated by many researchers on the properties of shaped (bricks) and un-shaped (monolithic) refractory products. The obtained results were very promising and satisfactory. One of the most consumable refractory products in various industries is monolithic refractories, which has been widely used because of their great benefits to the other refractories products (bricks). In this paper, recent advances in monolithic refractories by using the finding of nanotechnology are presented. This article can be considered as guidance for researchers, students to gain easy access to experimental results obtained by different research group using nanotechnology and nano materials in monolithic refractories. تفاصيل المقالة

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5 - Recent Advancement in monolithic refractories via application of Nanotechnology “A review Paper”
Hassan Gheisari Salman Ghasemi-kahrizsangi Ebrahim Karamian Ali Nemati

10.22034/jna.2019.664385

In recent years, the use of nanotechnology (nano-particles, nanomaterial, nano-additives and nanostructuredmaterials) has attracted attention of scholars, engineers and scientists in all scientificfields such as chemistry, medicine, material, agriculture, electronic etc أکثر

In recent years, the use of nanotechnology (nano-particles, nanomaterial, nano-additives and nanostructuredmaterials) has attracted attention of scholars, engineers and scientists in all scientificfields such as chemistry, medicine, material, agriculture, electronic etc. The use of nanotechnologyhas also become widespread in the refractory products (which mainly used in various industries suchas steel, casting, cement, glass etc.). Therefore, the effect of using different types and contents ofnanomaterials (oxides and non-oxides) as well as the control of microstructure has been evaluatedby many researchers on the properties of shapes (bricks) and un-shaped (monolithic) refractoryproducts. The obtained results were very promising and satisfactory. One of the most consumablerefractory products in various industries is monolithic refractories, which has been widely usedbecause of their great benefits to the other refractory products (bricks). In this paper, recent advancesin monolithic refractories by using the finding of nanotechnology are presented. This article can beconsidered as guidance for researchers, students gain easy access to experimental results obtainedby different research group using nanotechnology and nano materials in monolithic refractories. تفاصيل المقالة

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6 - ایجاد آرایـه های نانوکامپوزیتی ZnO/CeO2 درون کانـال های مونولیت لانـه زنبوری کوردیریتی
ایمان صفائی

در این پـژوهش آرایـه های منظم نانـوکامپـوزیتی ZnO/CeO2 درون کانـال های مونولیت لانه زنبوری کوردیریتی توسط روش ساده، و مقرون به صرفه هیدروترمال سنتز شد. بدین منظور جـوانه های اولیه اکسیـد روی با جهـت گیـری ترجیحی در راستای جهت (2 0 0) درون کانال هـای مونولیت با روش غوطه أکثر

در این پـژوهش آرایـه های منظم نانـوکامپـوزیتی ZnO/CeO2 درون کانـال های مونولیت لانه زنبوری کوردیریتی توسط روش ساده، و مقرون به صرفه هیدروترمال سنتز شد. بدین منظور جـوانه های اولیه اکسیـد روی با جهـت گیـری ترجیحی در راستای جهت (2 0 0) درون کانال هـای مونولیت با روش غوطه وری و پخت در دمـای 350 درجه سانتی گراد ایجاد شد. متوسط اندازه این ذرات توسط نرم افزار Digimizer از تصاویر میکروسکوپ الکترونی روبشی حدوداً 60 نانومتر تخمین زده شد. نانوآرایه های اکسید روی با هم ترازی، فشـردگی و یکنـواختی بالا با قطر حدود 200 نـانومتر با استفـاده از روش نـوین سنتز هیـدروترمال دومرحـله ای در دمـای 80 درجه سانتی گراد درون کانال های مونولیت لانه زنبوری کوردیریتی سنتز شد. از نانوآرایه های اکسید روی به عنوان هسته برای پوشش سریا استفاده شد. پوشش نانومتری سریا بر روی نانومیله های اکسید روی در حین مرحله دوم سنتز هیدروترمال ایجاد شد. نتایج پراش اشعه ایکس تشکیل فازهای اکسید روی و سریا را اثبات می کند. تفاصيل المقالة

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