نتایج جستجو برای: سوپرآلیاژ پایه نیکل gtd 111
تعداد نتایج: 87976 فیلتر نتایج به سال:
Allen (2001) proposed the “Getting Things Done” (GTD) method for personal productivity enhancement, and reduction of the stress caused by information overload. This paper argues that recent insights in psychology and cognitive science support and extend GTD’s recommendations. We first summarize GTD with the help of a flowchart. We then review the theories of situated, embodied and distributed c...
We start by studying the Goldberger-Treiman discrepancy (GTd) ∆ = (2.259± 0.591)%. Then we look at the πN σ term, with the dimensionless ratio σN/2mN = 3.35%. Finally we return to predicting (via the quark model) the πN coupling constant, with GTd ∆ → 0 as mq → mN/3. Given the recent new value of the πNN coupling constant [1] g πNN/4π = 13.80± 0.12 or gπNN = 13.169± 0.057, (1) along with the ob...
در این پژوهش اتصال سوپرآلیاژ in-738lc به روش فاز مایع گذرا با استفاده از فویل آمورف mbf-20 تولید شده به روش مذاب ریسی مورد بررسی قرار گرفت. فرایند اتصال دهی در دماهای 1035-1080 درجه سانتی گراد و زمانهای 30-60 دقیقه تحت اتمسفر خلاء انجام شد. نتایج بررسیهای ریزساختاری نشان داد که فازهای یوتکتیکی تشکیل شده در ناحیه انجماد غیر هم دما (asz) ذرات فازهای ثانویه بورایدی غنی از نیکل و کروم و سیلیسید ن...
امروزه در صنایع نیروگاهی به خصوص توربین های گازی از سوپرآلیاژهای مقاوم به خوردگی داغ و اکسیداسیون دما بالا استفاده می شود. این سوپرآلیاژها مقاومت خوبی در مقابل حمله و ورود گازهای داغ و نرمه خاکستر ناشی از احتراق سوختی و هم چنین خوردگی های اتمسفری از خود نشان می دهند. به همین دلیل استفاده از این سوپرآلیاژها در صنایع نیروگاهی امروزه مورد توجه بساری قرار دارند. از طرفی پوشش دهی پاشش حرارتی به روی ...
Background Gestational trophoblastic disease (GTD) defines a heterogenenous group of interrelated lesions that arise from the trophoblastic epithelium of the placenta. There are several histologically distinct types of GTD: hydatiform mole (complete or partial), persistant/invasive gestational trophoblastic neoplasia (GTN), choriocarcinoma and placenta site trophoblastic tumors. The aim of this...
We study the performance of compressed beamforming weights feedback technique in generalized triangular decomposition (GTD) based MIMO system. GTD is a beamforming technique that enjoys QoS flexibility. The technique, however, will perform at its optimum only when the full knowledge of channel state information (CSI) is available at the transmitter. This would be impossible in the real system, ...
Myosin Va is a well known processive motor involved in transport of organelles. A tail-inhibition model is generally accepted for the regulation of myosin Va: inhibited myosin Va is in a folded conformation such that the tail domain interacts with and inhibits myosin Va motor activity. Recent studies indicate that it is the C-terminal globular tail domain (GTD) that directly inhibits the motor ...
Background and Aim. EUS-guided transmural drainage (EUS-GTD) is now considered a minimally invasive and effective alternative to surgery for drainage of symptomatic pancreatic pseudocysts. However, the technique is rather difficult, and sometimes serious complications occur to patients undergoing this procedure. We retrospectively evaluated efficacy, safety, and long-term follow-up results of E...
Formation of stray grain defects particularly around re-entrant features of the turbine blade airfoils is one of the major problems in directional and single crystal solidification processes. In this work, directional solidification tests of the GTD-111 Ni-based superalloy were conducted at different withdrawal velocities of 3, 6 and 9 mm.min-1 using various stepped cylindrical and cubic design...
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