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When there is (not) enough of screen resolution on your device?

We face lots of screens and displays today, starting with computer monitors, TVs, and smartphones and ending with more sophisticated virtual reality (VR) displays like Oculus Rift. Most of them already use high-resolution displays. For instance, Ultra HD 4k displays are becoming more and more available in the list of monitors. But what does this mean, and is this enough or too much? Many tests and debates are running about proper screen resolution when you have good picture quality and not waste only numbers. This is not what are we are going to discuss. Everyone has to find their own optimal solution. Why not do this rationally instead of chasing numbers. Fig. 1 Screen door effect From the practical side, resolution alone doesn’t have significant meaning when choosing screens and displays. You could take the other two parameters into account – distance from screen and screen size. All those parameters go along with human visual acuity – the smallest thing he can spot. When you go to the eye inspection, you are given a character chart to point to the smallest symbols you can see. The number next to that line represents your visual acuity. For healthy people, the parameter…

How not to struggle with writing

Many people seem are naturally good at writing. They write great reports and articles that way so other enjoy reading. If you look more into the writing process, you start seeing that it takes lots of practice, planning and discipline to do it great. So in order to get on to right track you should analyze the routine the successful writers do when they write. The main roadblock in writing great essays is pressure. The need to write it fast and good simply freezes the brain. The fear of failure may take over. But there is good news – you can write and write well. All you need is to get over the pressure and build a simple strategy that will help accomplish the task. A probably most important part of writing is to get rid of fears and brain freezes. If you have failed in writing earlier, brain remembers and starts blocking again. Then you probably grab chocolate or cigarette, hoping to release tension. And later, you find that this doesn’t help much.

Transferring files with SCP between raspberries

I was playing with Raspberry Pi Model B for quite a long time. I tweaked few settings, and wrote couple helper scripts. After some time second Raspberry Pi 2 arrived. I realized that most settings and scripts that were working on previous should do fine on a new one. I needed to copy few files from one Raspberry to another. For this purpose, I decided to use Secure Copy (SCP). This is a file-sending command over SSH. Raspbian OS already come with SCP installed, so you can use it right away. (it is missing you can install it by running the command sudo apt-get install scp).

Automation In The Medical Field

The advancement in technology and medical automation has led to the increased use of linear actuators in the medical field that has continued to render pneumatic and hydraulic systems obsolete. The use of actuators will vary depending on their sizes that range from the tiny ones (2” strokes) to the large ones (24” stokes). Other than changes in technology, several other contributing factors have necessitated increased actuators in the health sector. Key reasons for the increased usage of actuators in the medical field First, the size of a machine is a factor to consider when deciding the technology to use. Actuators are appealing in size, especially compared to hydraulics that can yield a similar amount of strength. Secondly, when in action, actuators produce less noise as compared to pneumatic and hydraulic solutions. The hiss and gurgle sound found in pneumatics and hydraulics do not exist in actuators that have triggered their continued use. The photo below is a sample of the actuator’s wheelchair. Another positive factor that has contributed towards the use of actuators is that they are precise. Pneumatic pistons can be positioned correctly at either full extension or retraction. Lastly, actuators have fewer moving parts implying that fewer…

Wavelet transform – the basics

Recently I’ve been reviewing wavelet transform. I think some points are worth sharing. In this first post, I would like to mention the basics of wavelet transform and its main features. A probably most important question that comes to mind is why we need another transform when we already have Fourier transform. The answer lies in the signals that we want to analyze. If we take any periodic signal that is stationary (e.g., Pulse train) then Fourier transform is the right tool because its frequency components don’t change in time. Let’s take another case when the signal changes in time (chirp signal). Classical Fourier transform cannot determine frequency components of such signal because it doesn’t carry any information about signal time scale. Of course, it is possible to cheat with Short Time Fourier Transform (STFT) when the signal is analyzed in short chunks, but again there is a problem of resolution – the shorter chunks give better time resolution, and longer – better frequency resolution. You can find more info on this by looking for Heisenberg’s Uncertainty Principle. So there is always a tradeoff between both. A fundamental limitation of Fourier transform is in its base function, which is a…

3 Essential Steps for Safe Welding

Accidents are minimized when welders take responsibility for their own actions. As a welder, you need to observe safety precautions to keep yourself and others safe. Because welding equipment varies, consult the manufacturer’s manual for guidelines on how to use your particular machinery and tools. However, no matter what type of equipment you use, there are general safety precautions that are smart to follow. Secure the Environment Prospective welding sites must be inspected for potential fire hazards, and all safety precautions should be observed. For instance, in some areas, a fire watch is required for a specific amount of time after welding operations cease. Your site needs to have fire extinguishers ready, and combustible material should be removed or shielded. Many areas are unsafe for welding because of the risk of fire. Prohibitions to welding should always be respected.

How to Save on Building a Home PC

A personal computer – a PC, is one of the most versatile tools you can have in your home to keep it short. Although it has no specific destination, as many other devices built to do something, it can be used in various ways. You can use your PC as a gaming device to play online games at Euro Palace. The gaming outlet offers you a wide range of over 700 titles to try free or play for real and win real cash by downloading the free casino suite from their website. Euro Palace also offers its new and existing players the most varied promotions, from free cash to dream vacations and even the chance to win a Caribbean cruise. But all that fades besides the biggest prize a player can win over there – a jackpot worth over $8 million. A topic I’m going to discuss at a different time.

Trying DSO138 digital oscilloscope from Gearbest

We all agree that hobbyist or engineer should have proper bench oscilloscope for everyday use. They have all standard features including built-in screen, interchangeable probes and convenient knob controls. Anyway if you are looking for a temporary cheap solution, you can try building your own oscilloscope. Luckily you don’t have to make it from scratch because there are many projects and kits available that are cheap but powerful enough to fit most of the basic needs.

Time is slowing whilst life is speeding up: Where’s Einstein when you need him?

The news that the world is slowing down – and that time itself is running slow – announced to explain the leap second at midnight on June 30th will have struck many readers as odd. After all, all the available evidence suggests that the pace of life is speeding up, not slowing down. And it certainly feels like it is speeding up faster than one second every two or three years. by DonkeyHotey Anyone close to keeping up to speed over the past decade will only have seen the pace of their life accelerating. Ever-faster connectivity, shopping that arrives without you having to leave home, instant messaging, mobile everything, and all of it available 24/7 full of organic veg. Everything is getting faster all the time (everything except coffee, actually, but there is always at least one exception).

The Benefits of Using an HTML Editor For Your Website

For most small business owners, finding a way to get attention for their company is a top concern and something they work very hard to obtain. With all of the different tools out there for self-promotion, finding the right ones will take some time and research. One of the best ways to connect with your audience is by having a company website. Most business owners are intimidated when it comes to building their own websites due to their lack of knowledge. The best way to make sure a website is put together the right way is by using a wpf wysiwyg editor. Here are a few benefits a program like this can bring. Easy to Get a Website Laid Out Using an HTML editor can be an invaluable resource when trying to get a new business website up and going. For an inexperienced business owner, trying to code their own website is impossible without the proper knowledge. An HTML editor will allow the business owner to build their site without coding the whole thing, which can get it up and running in no time.