SCADA stands for the Supervisory Control and Data Acquisition. This system basically collects the information from the various sensors installed at the factory or the remote locations. Then the whole of the collected data is sent to the common or central computer for the further processing and storage. This term is used to symbolize the control and management solutions in various small and large-scale industries such as Water management, Power sector, environment control and production units.

SCADA includes networks, controllers, softwares and the hardware, such as sensors, which will transmit and receive the signals. These sensors will collect the data from the site and send to the central system. The central system has the Remote Terminal Units (also called RTU’s) working as its brain. RTU’s are programmed to a particular set of logics and then they process the data according to that.

Human interference is allowed in the RTU’s for changing the parameters or reprogramming. It is a real time system and will maintain the log of meter readings as well as the various changes in the status of the sensors. For the human interference SCADA has the Human Machine Interface (HMI). This is where the whole data that has been processed can be viewed by the human. If one is to make any changes then those changes are also made at this end through the use of programmable logic controllers. These HMI’s are linked to the databases from where HMI’s will collect data and then present to the human controllers in the form of graphs or tables.

These systems are extremely useful on small scale such as weather management as well as for the large-scale industries such as nuclear plants. These systems are easily available in the market and can be customized according to the requirements at a very affordable cost.

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Theoretically, soy-based inks are supposed to be the solution to the environmental problems associated with petroleum-based inks on millions of tons of paper deposited in landfills. Here are a few things you should know about soy-based inks.

They’re environmentally friendly-but not biodegradable. Soy-based inks are environmentally friendly to the extent that they don’t release volatile organic compounds (VOC’s) into the air, as the usual commercial inks do. However, they also use heavy metals to create some colors-and these can be harmful to the environment as well.

The colors are more brilliant. Soy-based inks are said to have more vibrant colors than traditional inks, and this is generally true-mainly because vegetable oil is clearer than petroleum.

They’re not commercially available. You can’t simply decide to use soy-based inks in your printer as a way of protecting the environment, because personal printers that accommodate them don’t exist. They’re mainly used by professional printing companies.

Soy inks are more expensive. Soy ink cartridges can cost significantly more than petroleum-based ink-usually about 10% to 50% more.

They don’t work on glossy paper. Soy-based inks don’t dry as quickly as petroleum-based inks do-petroleum inks dry quickly because of the evaporation properties of VOC’s. They work well on porous paper surfaces, but they smear when you print on glossy paper.

They’re not your only option. Inks made from linseed and other vegetable oils are also available, and they tend to be of comparable quality and ecological soundness to soy-based inks.

Soy inks are generally more environmentally friendly than traditional inks. Hopefully, the industry will continue to develop them until they have a product that’s completely biodegradable.

P.Warrior is managing director of Ink and Media Limited based in Essex. Ink and Media are an online retailer specializing in ink cartridges and toner. For more info and a selection of ink by major brands including Canon ink visit http://www.inkandmedialtd.co.uk/acatalog/Canon.html

Storage devices are used for storing files. There are many types of storage devices, some have larger capacity than others.

It all started with floppy disks which had little capacity but at that time were very useful. Rewritable cd’s and dvd’s came out later and were used to move data from one place to another. Nowadays we have many types of storage devices, from USB’s, SSD’s to remote hard drives that provide a huge amount of capacity and space to store files.

You got mp3 players that are used not only for playing music but for storing information too, you can put data on them trough an USB connection, and you can do the same with mp4 players and mobile phones. There are differences in storage capacity and copying speed between specific devices, and there is a difference in price of course as well.

Usually the price differs depending on how much capacity the device possesses. Devices come in different shapes and sizes and the main goal of providers is to make devices that are small in size and have a lot of free space on it.

You must be careful when using storage devices because you can get a virus from some other computer easily and you can infect other computer as well. That particular virus can be attached to some executable file on your storage device. Let’s take the USB storage device for example. You can plug in the USB device and the virus will automatically start to look for other files that are executables on that computer.

You can store files on your mp3 player that are not mp3 files, you can add images, movies and basically everything you want. However, you will only be able to access those files if you plug in the mp3 player to a computer. That is in case your mp3 player doesn’t support other types of files, there are some that actually do support these types of files though.

Storage devices now have more space than before; you got drives that have one TB (1000 GB) of free space, and floppy discs for example had only about 14 MB of free space. You have external hard drives that offer the biggest amount of space in general and are suitable to be carried around. They are packed in a hard case that can be carried because it is safe that way, you just need to plug it in your USB port and to plug it in a hub to power it.

Storage devices can come in handy when traveling, when you don’t have access to the internet and need to give some data to somebody, when you need to take some data from friends, colleagues, etc.

Storage devices are not so expensive nowadays as people are constantly using them for fast file moving, copying and similar processes. If you need a storage device you should first see what you need, is it for your personal computer or for transport of data. Once you decide what you need you have a really big choice of designs and technical specifications of devices so you can choose what suits you best, you can than compare the prices and make the best deal possible for yourself.

The Computer Guy, You can find me at Computer Repairs Perth