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Four stroke engine
Mei 16, 2009, 4:33 pm
Filed under: Mechanical Engineer

Today, internal combustion engines in cars, trucks, motorcycles, aircraft, construction machinery and many others, most commonly use a four-stroke cycle. The four strokes refer to intake, compression, combustion (power), and exhaust strokes that occur during two crankshaft rotations per working cycle of the Gasoline engine and Diesel engine.

The cycle begins at top dead center (TDC), when the piston is farthest away from the axis of the crankshaft. On the intake or induction stroke of the piston, the piston descends from the top of the cylinder, reducing the pressure inside the cylinder. A mixture of fuel and air is forced (by atmospheric or greater pressure) into the cylinder through the intake (inlet) port. The intake (inlet) valve (or valves) then close(s), and the compression stroke compresses the fuel–air mixture.

The air–fuel mixture is then ignited near the end of the compression stroke, usually by a spark plug (for a gasoline or Otto cycle engine) or by the heat and pressure of compression (for a Diesel cycle or compression ignition engine). The resulting pressure of burning gases pushes the piston through the power stroke. Baca lebih lanjut



Kultur Jaringan
Mei 13, 2009, 12:16 pm
Filed under: Sience

Kultur jaringan merupakan salah satu cara perbanyakan tanaman secara vegetatif. Kultur jaringan merupakan teknik perbanyakan tanaman dengan cara mengisolasi bagian tanaman seperti daun, mata tunas, serta menumbuhkan bagian-bagian tersebut dalam media buatan secara aseptik yang kaya nutrisi dan zat pengatur tumbuh dalam wadah tertutup yang tembus cahaya sehingga bagian tanaman dapat memperbanyak diri dan bergenerasi menjadi tanaman lengkap. Prinsip utama dari teknik kultur jaringan adalah perbayakan tanaman dengan menggunakan Baca lebih lanjut



Utamakan Pelayanan atau Keluarga?
Mei 5, 2009, 4:19 pm
Filed under: Christian


Beberapa waktu lalu saya terima SMS yang bertanya apakah harus mengutamakan pelayanan atau keluarga?

Setelah mengingat-ingat Baca lebih lanjut



Bearing
Mei 3, 2009, 4:44 am
Filed under: Mechanical Engineer

A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of Baca lebih lanjut