نتایج جستجو برای: لامپ led
تعداد نتایج: 212107 فیلتر نتایج به سال:
چکیده خشک شدن قارچ دکمه ای در یک خشک کن ترکیبی مادون قرمز- هوای داغ در توان های 150، 250 و 375 وات، دماهای 50، 60 و 70 درجه سلسیوس و سرعت جریان هوای 1، 2 و 3 متر بر ثانیه بررسی شد. تأثیر توان لامپ، دما و سرعت جریان هوا بر زمان و آهنگ خشک شدن، ضرایب نفوذ رطوبت و انرژی فعال سازی در قالب طرح کاملاً تصادفی بررسی شد. نتایج نشان داد تأثیر توان لامپ، دما و سرعت جابه جایی هوا بر فرآیند خشک شدن محصول قار...
هدف از انجام این مطالعه، ارزیابی امکان گندزدایی پساب تصفیه ثانویه در شرایط راهبری فعلی تصفیهخانه فاضلاب شمال اصفهان با استفاده از سیستم گندزدایی تلفیقی شامل فیلتراسیون و اشعه فرابنفش بود. به این منظور، سیستم پایلوت شامل واحدهای فیلتر شنی تحت فشار، لامپ فرا بنفش کم فشار (LP) و فشار متوسط (MP) طراحی و بهطور سری در محل تصفیهخانه نصب شد. دزUV بر اساس شدت اولیه لامپ، دبی و عبور اشعه از پساب متغی...
This study investigates the relationship between factor income distribution and aggregate demand in the context of the Post-Keynesian school, using data from Iran over the period 1346-1393. To this end, profit share and GDP growth are used as proxies for factor income distribution and demand growth, respectively. The results of the cointegration analysis based on the ARDL approach show that pro...
High-Brightness Light Emitting Diodes (HB-LEDs) are considered the future trend in lighting not only due to their high efficiency and high reliability, but also due to their other outstanding characteristics: chromatic variety, shock and vibration resistance, etc. Nevertheless, they need the development of new power supplies especially designed for boosting and taking advantage of their aforeme...
a r t i c l e i n f o Keywords: High-power LED lamp Step-stress accelerated test Subsystem isolation method Lifetime Degradation Mechanism The lifetimes of high-power light-emitting diode (LED) lamps are investigated by step-stress accelerated test. The entire lamp is divided into three subsystems, namely, the LED light source, the driver, and the mechanical fixture. Step-stress accelerated tes...
Sinkhole development occurs in many areas of the world where soluble rocks crop out. Sinkholes are generally the surface expression of the presence of caves and other groundwater flow conduits in carbonate rocks, which are solutionally enlarged secondary permeability features. Their formation may be either natural or caused by man’s activities. In both cases, heavy consequences have to be regis...
The galvactivator is a glove-like wearable device that senses the wearer's skin conductivity and maps its values to a bright LED display, making the skin conductivity level visible. Increases in skin conductivity tend to be good indicators of physiological arousal --causing the galvactivator display to glow brightly. The new form factor of this sensor frees the wearer from the traditional requi...
Smart city is an attractive way of making the city more livable through intelligent solutions that are enabled by information and communication technology. Regarding the lighting system, it achieves the perfect balance between beautiful city ambience and preserving the darkness that makes cities more livable. As a smart city component, a public lighting system offers much more than light itself...
Twelve kinds of luminous environments were set up with white LED light source by changing the color temperature and illumination. Using feel discriminative index and the reaction time as the evaluation index, the effects of different luminous environments on human psychological feelings were researched, based on Signal Detection Theory and open windows. The results showed that lighting environm...
Face Recognition is widely used in security systems, such as surveillance, gate control systems, and guard robots, due to their user friendliness and convenience compared to other biometric approaches. Secure face recognition systems require advanced technology for face liveness detection, which can identify whether a face belongs to a real client or a portrait. However, with the development of...
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