Category: knowledge
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What is Refrigerator
Prior to the invention of refrigerators, food preservation imposed serious constraints. The best options were to suspend food in rivers, wells, or at the bottom of lakes, and absent these tactics, stable foods were heavily salted, spiced, pickled, or dried to prevent bacterial growth. With the industrial age, we began to understand thermodynamic cycles and—through…
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Android Activity Lifecycle
Willing to develop your own apps? Here i will bring you some basics about it. For me, the most basic thing before doing an android apps is knowing how the screen can be populated with fancy UI like in whatsapp, facebook, etc and destroy it. Android will do couple of actions from you pressed your…
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Pulse Width Modulation
Pulse width modulation (PWM) is a powerful technique for controlling analog circuits with a microprocessor’s digital outputs. Consider to control a 5V DC motor with linear relation between given voltage and rotation speed with a 5V microcontroller, then you need it to works on 3V for achieve slower rotation. This goal can be achieved at…
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Git in Nutshell
Git is kind of version control system (VCS) which would keep track every lines of your code so that you can recall specific versions later. Using a VCS also generally means that if you screw things up or lose files, you can easily recover. First thing first, let’s get your git : Git for OS X Git for…
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Can You Believe Your Eyes?
Ever wonder how we can see something in front of us? Is it real? Can we believe with our eyes? Everything we saw was a representation of every light in different frequency enter our eyes. Our eyes receive signal from environment in form of visible lights ( 380 nm – 750 nm). When we see…
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Why does not Aircraft Cabin Pressurized as Ground Level
Have you got your ear numb when you’re moving from one altitude to another one? It may happen when you use high elevator or mostly when you’re inside a takeoff or landing aircraft. In normal circumstances the air pressure is the same on both sides of our eardrums. But when the pressure in our environment changes significantly, the…
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How Tree Got Its Masses
Tress is one of the biggest thing that take place on our earth. Ever thinking how the tress in front of your house become so big and have a massive mass? Where are the mass come from? Put it in your mind and try to find it ! As Antoine Lavoisier said that mass in a closed system…
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VA vs Watt
You may see power unit that written as KVA and KW. Can you guess which one is true? The answer lead to both of them are true. KW will have the same meaning as KVA when the KVAR component is 0. Thinking as a perpendicular triangle with KW and KVAR as its perpendicular side and…
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Program (Computer Program)
What is it ? A computer program is a collection of instructions that performs a specific task when executed by a computer. A computer requires programs to function, and typically executes the program’s instructions in a central processing unit. – Wikipedia Confused? Alright, a program can simply said as a application in our computer, smartphone which…