Wireless Charging

Inductive charging (also known as “wireless charging“) uses an electromagnetic field to transfer energy between two objects. This is usually done with a charging station. Energy is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.

Induction chargers typically use an induction coil to create an alternating electromagnetic field from within a charging base station, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electrical current to charge the battery. The two induction coils in proximity combine to form an electrical transformer.Greater distances between sender and receiver coils can be achieved when the inductive charging system uses resonant inductive coupling.

* Advantages

1. Protected connections – no corrosion when the electronics are all enclosed, away from water or oxygen in the atmosphere.
2. Safer for medical implants – for embedded medical devices, allows recharging/powering through the skin rather than having wires penetrate the skin, which would increase the risk of infection.
3. Durability – Without the need to constantly plug and unplug the device, there is significantly less wear and tear on the socket of the device and the attaching cable.

* Disadvantages

1. Lower efficiency, waste heat – The main disadvantages of inductive charging are its lower efficiency and increased resistive heating in comparison to direct contact. Implementations using lower frequencies or older drive technologies charge more slowly and generate heat within most portable electronics.

2. Slower charging – due to the lower efficiency, devices can take longer to charge when supplied power is equal.

3. More costly – Inductive charging also requires drive electronics and coils in both device and charger, increasing the complexity and cost of manufacturing.

4. Inconvenience – When a mobile device is connected to a cable, it can be freely moved around and operated while charging. In current implementations of inductive charging (such as the Qi standard), the mobile device must be left on a pad, and thus can’t be moved around or easily operated while charging.

5. Newer approaches reduce transfer losses through the use of ultra thin coils, higher frequencies, and optimized drive electronics. This results in more efficient and compact chargers and receivers, facilitating their integration into mobile devices or batteries with minimal changes required. These technologies provide charging times comparable to wired approaches, and they are rapidly finding their way into mobile devices.

For example, the Magne Charge vehicle recharger system employs high-frequency induction to deliver high power at an efficiency of 86% (6.6 kW power delivery from a 7.68 kW power draw).

Courtesy of :  http://en.wikipedia.org/wiki/Inductive_charging

Please follow and like us:

My first DLSR – Canon EOS 650D ;)

Canon meluncurkan kamera DSLR terbaru EOS 650D yang menjadi DSLR entry-level pertama yang dipersenjatai dengan prosesor gambar DIGIC 5. Disandingkan dengan sensor APS-C Hybrid CMOS beresolusi 18 megapixel, 650D mampu menghasilkan gambar berukuran poster yang mendetail dan kaya warna. Kemampuan continuous shooting mengalami peningkatan menjadi 5 fps dengan resolusi penuh.
EOS 650D menjadi kamera EOS pertama yang menggunakan sistem AF ganda. Sistem ini mampu memperkaya detail foto dan menawarkan continuous AF tracking selama proses rekam video berlangsung. Sebagai tambahan, sistem AF dengan 9 titik cross type, serta sistem AF  Hybrid yang menawarkan continuous AF selama rekam video dan pengambilan gambar melalui mode Live View, telah dibenamkan dalam EOS 650D.

Layar LCD yang digunakan dalam EOS 650D mengalami pembaruan yang signifikan dibanding pendahulunya. Walaupun masih menggunakan ukuran 3 inci yang sama dan badan layar yang dapat disesuaikan dengan sudut pandang pengguna, EOS 650D menggunakan layar sentuh yang menawarkan pengalaman fotografi yang lebih menarik.

Melalui mode Live View, pengguna dapat memilih titik AF, melakukan face tracking, dan menyempurnakan pengaturan foto hanya dengan menyentuh layar beresolusi 1.040k-dot tersebut. Layar EOS 650D juga mendukung gestur multi-touch, seperti pinch-zooming dan swipping ketika melihat ulang hasil foto.

Dengan setiap pembaruan yang dilakukan, kemampuan rekam video 1080p, dan kehadiran fitur Creative Filters yang membantu menghasilkan foto-foto dengan efek unik, tampaknya EOS 650D dapat menjadi kamera DSLR entry-level yang tepat. Kamera ini dibanderol dengan harga USD849 (body), USD949 dengan lensa IS 18-55mm, atau USD1199 dengan lensa IS 18-135mm.
Courtesy of:

Please follow and like us:

“Banker to the Poor”

Professor Muhammad Yunus established the Grameen Bank in Bangladesh in 1983, fueled by the belief that credit is a fundamental human right. His objective was to help poor people escape from poverty by providing loans on terms suitable to them and by teaching them a few sound financial principles so they could help themselves.

From Dr. Yunus’ personal loan of small amounts of money to destitute basketweavers in Bangladesh in the mid-70s, the Grameen Bank has advanced to the forefront of a burgeoning world movement toward eradicating poverty through microlending. Replicas of the Grameen Bank model operate in more than 100 countries worldwide.

Born in 1940 in the seaport city of Chittagong, Professor Yunus studied at Dhaka University in Bangladesh, then received a Fulbright scholarship to study economics at Vanderbilt University. He received his Ph.D. in economics from Vanderbilt in 1969 and the following year became an assistant professor of economics at Middle Tennessee State University. Returning to Bangladesh, Yunus headed the economics department at Chittagong University.

From 1993 to 1995, Professor Yunus was a member of the International Advisory Group for the Fourth World Conference on Women, a post to which he was appointed by the UN secretary general. He has served on the Global Commission of Women’s Health, the Advisory Council for Sustainable Economic Development and the UN Expert Group on Women and Finance.

Professor Yunus is the recipient of numerous international awards for his ideas and endeavors, including the Mohamed Shabdeen Award for Science (1993), Sri Lanka; Humanitarian Award (1993), CARE, USA; World Food Prize (1994), World Food Prize Foundation, USA; lndependence Day Award (1987), Bangladesh’s highest award; King Hussein Humanitarian Leadership Award (2000), King Hussien Foundation, Jordan; Volvo Environment Prize (2003), Volvo Environment Prize Foundation, Sweden; Nikkei Asia Prize for Regional Growth (2004), Nihon Keizai Shimbun, Japan; Franklin D. Roosevelt Freedom Award (2006), Roosevelt Institute of The Netherlands; and the Seoul Peace Prize (2006), Seoul Peace Prize Cultural Foundation, Seoul, Korea. He is a member of the board of the United Nations Foundation.

From Les Prix Nobel. The Nobel Prizes 2006, Editor Karl Grandin, [Nobel Foundation], Stockholm, 2007

This autobiography/biography was written at the time of the award and later published in the book series Les Prix Nobel/Nobel Lectures. The information is sometimes updated with an addendum submitted by the Laureate.

Copyright © The Nobel Foundation 2006


Please follow and like us: