callerring Indonesia

1.Pengertian Sistem Komunikasi Serat Optik Sistem Komunikasi Serat Optik yaitu sistem komunikasi yang dalam pengiriman dan penerimaan sinyal menggunakan sumber optik, detektor optik, dan serat optik dan dengan panjang gelombang cahaya 850 nm, 1310 nm dan 1550 nm. Yang mempunyai fungsi sebagai berikut : 1. Arah Kirim a. Memperbaiki dan menggabungkan sinyal-sinyal input. b. Mengubah sinyal listrik/elektris menjadi sinyal optik cahaya. 2. Arah Terima a.Mengubah sinyal optik/cahaya menjadi sinyal listrik/elektris. b.Memperbaiki dan memisahkan sinyal-sinyal input. 2.Konfigurasi Sistem Sistem Komunikasi Serat Optik terdiri dari : a.Pemancar optik (Optical Transmitter) 1)LED (Light Emitting Diode) atau Diode LASER (Light Amplification by Stimulated Emission of Radiation) 2)EC (Electrical Circuit) b Serat optik sebagai media (Optical Fiber) Dibuat dari serat beling dengan ukuran diameter mikro meter. c Penerima Optik (Optical Receiver) 1)Diode PIN (Positive Instrinsic Nega...

SOLAR CELLS A solar cell is an electronic device that produces electricity when light falls on it. The light is absorbed and the cell produces dc voltage and current. The device has a positive and a negative contact between which the voltage is generated and through which the current can flow. Solar cells have no moving parts. Effectively they take light energy and convert it into electrical energy in an electrical circuit in physical process known as the photovoltaic effect. The discovery of the photovoltaic effect is credited to the French physicist, Edmond Becquerel in 1839. He found that by concentrating the sun's light on one side of a battery the output current of the battery could be increased. This revolutionary discovery triggered the idea that one could produce energy from light by an artificial process. In 1883 an American inventor produced a solar cell from a material called selenium, but it was very inefficient. Selenium became used in light-exposure meters for...

NANOTECHNOLOGY Nanotechnology is a multi-disciplinary field of applied science, technology and industry which involves creating and manipulating matter at the nanoscale. Nano means small and is the prefix used to describe properties at 10 -9 . Therefore the nanoscale exists for characteristics that form in terms of particles or channels at a nanometer that is 10 -9 or one ten-thousandth the width of a human hair. The nanotechnology revolution promises big things. Many scientists in around the world believe that nanotechnology will allow the creation of tiny machines and engines for use by humans in many different environments. One concept that has received a lot of attention in this regard is the idea of the nanobot. A robot created on the nanoscale and which could perform medical interventions in living human beings by travelling through blood vessels. Nanobots might scan for cancer cells, deliver drugs directly to sasaran organs or even repair defective body parts. As well a...

PENDAHULUAN Radionuklida yaitu nuklida yang tidak stabil yang mencapai stabilitas lebih besar dengan mengalami transformasi nuklir. Nuklida-nuklida sanggup memancarkan partikel alfa atau beta ketika rasio neutron terhadap proton dalam inti tidak menguntungkan untuk keadaan stabilitas. Jika, sehabis emisi partikel, nuklida masih dalam keadaan tidak stabil, maka ha ini memungkinkn untuk memancarkan sinar gamma untuk transisi dari tingkat nuklir tereksitasi ke tingkat dasar yang stabil dengan tidak ada perubahan lebih lanjut dalam rasio neutron terhadap proton. Proses emisi nuklir mempunyai energi kinetik yang tinggi dalam kisaran beberapa ribuan electronvolts (keV) terhadap beberapa juta electronvolts (MeV). SATUAN RADIOAKTIVITAS Intensitas sumber radioaktif (aktivitas) ditentukan oleh tingkat transformasi nuklir per satuan waktu. Satuan radioaktivitas yang semakin tua, curie (Ci), pada awalnya didefinisikan sebagai acara terkait dengan 1 g ...