نتایج جستجو برای: pulse efficiency
تعداد نتایج: 473881 فیلتر نتایج به سال:
Bow-tie antenna is widely used for pulse radiation, but the radiation efficiency is less than 30%. In this letter, a novel method is presented to improve the efficiency by exploiting the energy in end reflections, which are thought to be harmful and usually suppressed in the reported literatures. When the exciting pulse is bipolar and monocycle, it is indicated that, the end reflection can be u...
The ignition of pre-compressed fuel by convergent shock wave, as a new approach in inertial confinement fusion that is known as shock ignition is considered with the aim of achieving high gain and providing threshold of ignition in lower energy. In this research, optimization of the energy of individual ions in the beam according to the hydrodynamic efficiency and target energy gain in a five-l...
با ظهور و گسترش سیستم های مخابراتی با عرض پالس بسیار باریک، پهنای باند بسیار وسیع، محدودیت پهنای باند و سرعت قطعات الکترونیکی موجود، استفاده از بسیاری از ساختار های آشکار سازی ناهمدوس شناخته شده پیشین با دشواری روبرو است و طراحی گیرنده مناسب در اینگونه سیستم ها از اهمیت ویژه ای برخودار است. در حوزه رادیویی، طراحی گیرنده-های ساده و کم مصرف در مخابرات فراپهن باند (uwb) بدون استفاده از مکانیزم های...
In this paper, a novel switched-capacitor DC-DC converter with pulse density and width modulation (PDWM) is proposed with reduced output ripple at variable output voltages. While performing pulse density modulation (PDM), the proposed PDWM modulates the pulse width at the same time to reduce the output ripple with high power efficiency. The prototype chip was implemented using 65 nm CMOS proces...
Engine downsizing allows automotive manufactures to achieve improved efficiency and reduce emissions. Turbocharging can increase the power density of the engine, and therefore plays a vital role in downsizing. Due to the nature of the reciprocating engine, a turbocharger turbine operates in a highly unsteady environment. This paper presents a computational investigation looking at the impact of...
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