The Hypersonic Air-breathing Weapon Concept (HAWC), pronounced HAWK, is a joint program between DARPA and The US Air Force. It is an experimental project for the development and testing of a scramjet powered air-launched hypersonic cruise missile. Here is what all that means: Scramjet – A jet engine in which combustion takes place in supersonic airflow. […] More
A few days ago I went for a quick walk down to the end of my road and back. I wanted to get a good chunk of steps in to improve my Fitbit stats. On my way back, I noticed my neighbors across the street had hired a couple guys to work on their porch. […] More
Firmware is a software program that is hardcoded into the non-volatile memory of a microcontroller. It controls the hardware device that the MCU is attached to and brings it to life. It is the one and only program controlling the hardware device, and it is always running. A Fitbit for example, has firmware on an […] More
“If anything can go wrong, it will” In management, it is said that because of Murphy’s Law, you should “expect the unexpected”. More
The Law of Averages is the belief that a particular outcome of a random event will occur at a frequency that is similar to its probability if the random event happens many, many times. For example, the Law of Averages says that if you roll a die 100 times, you will roll a 4 approximately […] More
A software is “open source” if its source code is made open and available to the public for free. Usually, any developer can use and modify the code, so long as they are compliant with the license that the authors have chosen for the project. More
We analyze a circuit using Kirchhoff’s Rules (a.k.a. Kirchhoff’s Laws). The Junction Rule: “The sum of the currents into a junction is equal to the sum of the currents out of that junction.” (Conservation of Charge) The Loop Rule: “The sum of the voltages around a closed loop is equal to zero.” (Conservation of Energy).
How are things made? In this video I take a look at the different types of manufacturing processes – forming, casting, molding, machining, joining, and additive manufacturing – which are used to create the everyday objects that surround us.
Using animations, the video explores a number of different specific manufacturing techniques, like rolling, injection molding, investment casting, sand casting, and 3D printing, and gives an overview of the pros and cons of each, to help better understand how to select the correct manufacturing process.
Bill details the key engineering principles underlying plastic injection molding. He describes its history and, then, reveals the intricate details of the process. He shows viewers where to found, on any injection molding product, the markings created by injection molding. He closes with a description of one of the finest examples of injection molding: the Lego brick.
Trying to decide between WordPress.com vs WordPress.org? This post walks through the pros and cons to help you pick which is better for YOU.
What is energy? Energy is the ability to move something. Energy has two states Energy can be in two states, potential and kinetic. Potential energy is a motionless state, where a small change in the conditions of the system can cause something to move. Kinetic energy is the state in which something is actually moving. […] More
Follow the construction of a new getaway home from start to finish… every step! This is a small modern vacation home for a client in Bryson City, NC. It will also be used as an Air B&B that you can actually rent when it is completed. This series will have lots of practical building tips, show the step-by-step methods of building, and highlight problems we encounter during the build.
Why does it rain? It rains when droplets of water in the clouds grow so large that they become too heavy to stay suspended in the air due to gravity. Then the droplets fall from the clouds as rain. Rain is essentially the clouds themselves falling to the surface of Earth one heavy water droplet […] More
Metadata is data about data. … A simple example of metadata for a document might include a collection of information like the author, file size, the date the document was created, and keywords to describe the document. Metadata for a music file might include the artist’s name, the album, and the year it was released. More
Discord is an all-in-one communication platform and it has voice chat, video chat, text chat, screen share and it’s free to use.Discord is available on the b…
High Definition (HD) simply means there are more pixels on the screen from top to bottom and the image quality is therefore higher as compared to its Standard Definition (SD) predecessor. Standard Definition starts at 240 and ends at 480 pixels from the bottom to the top of the screen; 720 is semi-HD; 1080 is […] More
There are two related, but slightly different definitions of resolution. There is image resolution, which is explained here: https://guides.lib.umich.edu/c.php?g=282942&p=1885350 And there is screen resolution for a tv or monitor. When talking about image resolution, the number is given as PPI, or pixels per inch. The resolution is not connected to the total height and width […] More
The solar and lunar calendars each have their strengths. This segment from Dr. David Neiman’s series, “Cradles of Civilization” discusses the method of reconciliation between these two systems and the adjustments made to the lunar system in the Jewish calendar.
See the link above for an explanation of the different phases of the moon.
Click here for a good diagram and explanation on how we can see a full moon if it is behind the Earth relative to the Sun.
WHAT are tides? Tides are the rise and fall of sea levels throughout the day caused by the gravitational force that the Moon exerts on the Earth. High tide is when the sea level is at its highest. Low tide is when the sea level is at its lowest. There are two high tides and […] More
SIM card stands for Subscriber Identification Module. It is a small memory card used in GSM phones that contain unique information that identifies the owner of the phone to the mobile network used by his carrier. The SIM card is provided by the GSM wireless carrier and is needed to be able to make calls, […] More
MAC address is a unique identifier that is assigned to a NIC (Network Interface Controller) Card. It consists of a 48 bit or 64-bit address, which is associated with the network adapter. MAC address can be in hexadecimal format. The full form of MAC address is Media Access Control address. The MAC address is provided by the manufacturer of the physical network card when it is created and never changes.
An IP address is an address that helps you to identify a network connection. It is termed as the ‘Logical Address,’ which is provided to a connection in a network. The IP address is assigned by the ISP and can change when you move your computer from one network to another.
CSMA/CA is the networking protocol used by wireless routers (WiFi).
Why does wireless networking use CSMA/CA instead of CSMA/CD?
Today we start a three episode arc on the rise of a global telecommunications network that changed the world forever. We’re going to begin with computer netw…
An extranet is a controlled private network that allows access to partners, vendors, and suppliers or an authorized set of customers – normally to a subset of the information accessible from an organization’s intranet.
A transceiver is a component of a wireless device that is able to both transmit and receive information through radio waves. It is a combination of a transmitter and receiver, hence the name transceiver. Transceivers are most commonly used in wireless devices, like cell phones. Other common examples include walkie-talkies and CB radios.
Despite the widespread use of transceivers, one common device that does not use them is a radio. A radio only has a receiver that receives the radio signal transmitted by radio stations for the listeners to enjoy.
Natural gas is a fossil energy source that formed deep beneath the earth’s surface. It is an odorless, colorless gas, largely formed over millions of years from animal and plant remains. It’s made of a variety of compounds, but methane is by far the most significant.
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