Category Archives: Linux

Wireless Power Transmission: real available technology and marketing advantages

Wireless energy transmission for remote charging is one of the most strategic key factor for the development of a new generation of tech devices in the near future. Few years ago some futuristic thinkers forecasted the possibility of wireless energy transmission between far places. In particular the academic community was interested in energy transmission between the planet earth and orbiting satellites equipped with solar power stations.

This long range power transmission technology would radically change the energetic, economic and power equilibrium of our world but unfortunately, at the moment, this technology is not available.

On the contrary, near range power transmission is something near the corner.

After long researches an USA company is launching the first generation commercial version of a wireless power transmitter with ultrasound that will allow to recharge (for the moment) mobile phones in a range of 15 feet (4.5 meters) just using a special cover.

Fifteen feet are not a long range nor a medium one but the important thing is that it is contactless and that 15 feet start to be an interesting distance.

So interesting that a big coffee shop chain as Starbucks is considering to introduce these remote charging devices in all its shops.

In this way all the customers will be able to automatically and freely charge their mobile devices as soon as they enter into the coffee shop. A good added value considering how much energy our devices need when strongly used during the day. And consequently, for many people, a good reason to prefer a store to another one. A potentially viral added value as well as a magnetic marketing strategy!

Last but not least, it must be considered that the success of this kind of technology operations is determined by costs. At the moment it is not possible to find any information about prices for the mobile device covers at the end consumer side. If the end users price for covers will be high, the huge, positive effects of a partnership with a big player as Starbucks couldn’t be enough without some kind of tech fashion pivot.

Good luck uBeam! You have the right idea!

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References:

http://techcrunch.com/2015/04/26/kill-the-cord/#.qngqm6:i3dY

Update from Fedora 18 to 20 or 21 in few simple clicks and without (I hope) problems!

How to delete – double – icons on your Android smartphones!

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Google Play Store The first time I noticed doubled icons appearing on my Android 4.4 smartphone I thought that it was a temporary problem. So I tried to solve that with a simple reboot but I didn’t succeed.

Moreover when I tried to delete just one of the doubled icons I uninstalled the App…. This kind of matter is typical of smartphones and it usually doesn’t happen on tablets or Android PCs where you have a dedicated room (the “menu” page) to uninstall software (Apps) and different “screens” to organize them.

This means that if you delete a App’s icon from one of the “screens” you will still have your software installed into your device. The problem of double icons on smartphones is caused by a wrong configuration of your personal settings on Google Play Store.

To solve it, you have to:

1 – find all the problematic Apps;

2 – go to Google Play — Settings – and deselect “Add icon to home screen”;

3 – uninstall the “problematic” Apps;

4 – reinstall them.

To conclude it’s better to solve this kind of problem as soon as you notice it because, to solve the matter, you will have to waste your time uninstalling and reinstalling all the Apps with doubled icons.

GrooveDown vs. GrooveOff: my personal experience using Grooveshark

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Grooveshark is an online music service, very well-known and common especially in Europe. The quality of its mp3, offered just for listening is higher than what you find on YouTube and some programs were developed to allow listeners to search and listen songs without visiting the Grooveshark website. Some of these software let you save sample of songs for a later listening but this habit doesn’t complain with the copyright laws in many countries so we discourage this kind of practice.

Today we would like to just endorse the ability of a single developer (www.caleta.fm) who was able to modify one of these programs, GrooveDown, and adapt it to the new website requisites.

This developer, using wireshark, was able to identify the misconfiguration between GrooveDown and the Grooveshark’s server and to positively update the data (client version and password) exchanged.

More in general I think that GrooveDown is the best client to listen to Grooveshark also because it is more powerful, fast and easy to use than its competitors. In particular, during some tests I did, I was positively impressed by the results I obtained using GrooveDown because I received better and more complete search results than using, for example, GrooveOff which is too a good software but, for my personal experience, gave back less impressive results.

Last but not least I want to underline that the caleta.fm development of GrooveDown is really stable and it was developed in two different versions just to be used with Java6 or Java7 platform. Recommended!

Once again about cookies, supercookies and Flash cookies… How to better protect Firefox, your Linux OS and.. you!

Keep Calibre always updated! Correctly manage your digital library and new e-book formats

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Library As you know, Calibre is a powerful tool that allows you to easily manage your e-book library. It also allows you to back up the e-books that you buy online and to transfer them to other devices when your e-book reader is out-of-order.

Sometimes the problem is that e-book formats evolve rapidly and new versions have been “recently”created. For this reason I personally suggest to update Calibre very often because new version have, obviously, the most updated plugins and consequently support new formats.

The Calibre website has a good download section where you find easy instructions to update your e-book reader on almost any OS. In my experience, usually you spend less than 6-7 minutes to update Calibre and the advantages you have worth the time you spend.

Moreover, if you have problems to read an e-book on the last version of Calibre, check the file format (in my case was .azw3), launch Calibre and go in Preferences → Behaviour. Then, be sure that the file format you are trying to open/read is correctly activated into the list you find there. Enjoy your reading!

How to manually mount USB drives on Ubuntu

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The first time I had this kind of problem was when I was trying to create a bootable USB drive and a pop-up windows appeared informing me that “you must first mount USB drive /dev/sdc1 to a mount-point. Most distributions will do this automatically after you remove and reinsert the USB drive”. I had never had this matter on Linux because, normally, all the USB drives are immediately recognized and mounted but there is always a first time….

After some googling I discovered that a specific program dconf-editor could help me to check the Linux settings and to consequentlyresolve the situation.

First of all you need to install dconf-editor on your Linux so you have to open a Terminal and type:

sudo apt-get install dconf-tools

After the installation you launch dconf-editor (for MATE environment it’s into the System Tool menu) and navigate it to media-handling:

org –> gnome –> desktop –> media-handling

Now you have to be sure that commands automount and automount-open are both flagged.

If you discover that they are already flagged, its necessary to manually create a mount point using the Terminal.

Open a Terminal and type:

df -H

to see the mounted disks. If you are not able to find the USB drive that you want to mount then type:

sudo fdisk -l

and you’ll see all disks (mounted/unmounted).

Now you are able to know the right drive identity (e.g. sdb1, sdc1, sdd1) that your OS assigned to that specific drive. Memorize it and start to create the mount point:

sudo mkdir /media/newusb

where “newusb” is the mount point name you want to assign to your USB drive.

Then type:

sudo mount /dev/sdb1 /media/newusb

where “sdb1” is the drive identity we found before and “newusb” the mount-point name you choose.

That’s it, now your USB drive has a mounting point and you can use it (in my case I was able to create a bootable USB drive usiing Unetbootin)

You can find some extra useful tips about mounting USB drives at the Ubuntu community.

Spring Time! Now you are ready to protect your Ubuntu – Debian system from Rootkits and Viruses

How to upgrade your Fedora system when the Software Upgrade doesn’t work!

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Sometimes, if you use Fedora 18 – Spherical Cow, the Software Upgrade program couldn’t work properly. Software Upgrade shows you all the available upgrades but it is not able to install them. The download process starts but it will never finish and you wait for hours with no results. When and if you have this problem you can easily solve it launching a Terminal and typing the command:

yum update

In few minutes (depending on how many updates you need) your Fedora will be updated perfectly.

Last but not least, if you want to have a list of all the potential upgrades on your OS you can type:

yum list updates

and a complete list will be shown.

Bodhi: a less known but powerful Linux distribution

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If you are looking for a light Linux OS for your computer you can test Bodhi Linux. This specific Linux version, based on Ubuntu, utilizes the enlightenment graphical interface. For this reason Bodhi is particularly indicated also to give new life to computers with no updated hardware.

The graphical interface is really “zen” or rather clean, easy to navigate but complete. We tested the 32 bit version and it was a smooth experience also if we used a single core pc with 2 GB of RAM.

Before testing Bodhi you have to keep in mind that this Linux OS is really user oriented. It means it has just some few pre-installed programs and so you are free to customize it as you prefer. Last thing to remember is that Bodhi is a semi-rolling distribution ans so it will be updated in occasion of Ubuntu Long Term Releases (LTS). Try it, it is worth a chance!