segunda-feira, 15 de julho de 2019

Microsoft Windows lost files for no apparent reason explained

These last days, I accidentally step over a very old Windows bug that I had no clue.

While I was tweaking my new installation of Ubuntu 18.04 on my Lenovo U430 laptop, which I changed the original 500GB HDD for a 250GB SSD for better energy and overall performance and to stop the OEM Windows 8.1 install from corrupting my Grub (ie. forcing me to return to M$Win - sneaky peeking on my options every few days).

So on the help pages of the only windows applications that I still use under wine (because there isn't a port yet) I found this, in the new updated version:

"There are two bugs in Windows that give some users trouble. Both bugs relate to Windows hiding the true file name and path of files. Since it is common to use foreign (i.e., third party) files in combination with main application, this can cause confusion.

To circumvent these bugs, please follow the following steps. First, in Windows Explorer, goto to folder options, view, and uncheck 'Hide extensions for known file types.'

Second, on Vista or Windows 7 turn off User Account Control(UAC). UAC can cause the path of files to be different depending on which application is used to view the directory.

This breaks the fundamental paradigm of storing files in a computer by name.  

Is it is strongly recommended that you disable UAC. Otherwise it might appear that you have lost files for no apparent reason."

So there we have it!

Thank you God and bless Linus Torvalds, who has made Linux a true freedom of choice option, with no hidden buggy traps!

quarta-feira, 20 de fevereiro de 2019

LTS lifecycle for Ubuntu

Although security is a very important subject (one of the most important), I’d take the opportunity focus on the "LTS lifecycle".

What got my attention when I moved my private and "work" desktops, netbooks and laptops to Ubuntu back in 2006 was the fact that main goal of Ubuntu with the "Long Term Support" was the "support", meaning: planning, work goals, security updates, patches and documentations available online, and having people talk/blog about how they fix bugs and explaining there solutions, this is the real meaning of the word "ubuntu". But sadly now I have to move soon from 14.04.5 (ie I will be forced to upgrade) to 18.04.x, in the next few weeks because of the deadline.

From a business point perspective, the LTS lifecycle, considering the maturity and stability of a distribution, only is achieved after 3 or more years of using, troubleshooting, creating, cross-compiling, ... lots of hard work,  showing that you need to set at least 8 (eight) years as the goal for LTS!

I say this in respect to the great effort and cost to upgrade a version, which impacts considerably the working environment not only for the home, small, to medium and big companies, specially when the hardware takes longer to update, in realty, in most countries (ie. Africa, South America, middle East, etc) at least 8 to 10 years is quite common.

As an example, my main working desktop, here in Brazil, which I do most of my work, is a Gigabyte model: 965P-DS3, with a GeForce GT610, Intel Core2Duo 6300 with 8GB of RAM and 500GB HDD, which is an excellent work station for my needs, not only for work, but for Internet browsing, banking, YouTube, office, etc. But with limited BIOS features, makes it a real challenge and pain to upgrade (specially for a fresh install).

It is not only a question of buying a new hardware, which in my case, and in many countries, can be a very expensive step (can cost up to 3x the price compared to the USA market), but also because of ecological consciousness, carbon footprint, and who really thinks about "ubuntu".

quarta-feira, 23 de janeiro de 2019

Ubuntu: The Entrepreneur who wants to give it all away


Financial Times, 20/01/2006

So you've made half a billion dollars and you have paid for a trip to space. What on earth do you do next? Some might consider politics, others would sit back and enjoy a life of leisure. But for technology entrepreneur and cosmonaut Mark Shuttleworth the next battle was to take on the might of Microsoft on its core territory - the desktop.

He has developed a complete suite of software for personal computers that handles everything from the inner workings to word processing. It is called Ubuntu, named after one of the founding principles of post-apartheid South Africa, the country where he was born. In both the Zulu and Xhosa languages, it means "humanity to others".

The project is based on Linux, the free operating system written largely by volunteers and widely used by businesses, governments and other organisations to run servers, the computers that sit at the heart of networks. Ubuntu is meant to take this complex but powerful system and make it easy for non-technical people to use. Hence the project's mission statement - "Linux for human beings".

Although the technology behind it may be very different, a computer running Ubuntu looks much like one running Microsoft's Windows. The interface is based on similar menus, icons and windows, and users can surf the internet with the popular Firefox browser, or edit documents and spreadsheets with OpenOffice.

Instead of the largely blue world of Windows XP, Ubuntu is predominantly brown. Some quirky features hint at its African origin, such as the little burst of drumming that rings out when an application opens. Each new version of Ubuntu is known not just by the usual number, but an animal codename, such as Warty Warthog or Breezy Badger.

Less than two years after launch, Ubuntu has established itself as a favourite among the hundreds of different Linux-based operating systems. Ubuntu is top by some distance on a popularity chart for different flavours of Linux compiled by the website, DistroWatch. Exact numbers are hard to come by, but estimates put the number of computers running Ubuntu at up to6m and doubling everyeight months.

Unlike some of the other leading Linux projects, such as Linspire, Novell and Red Hat, Ubuntu is distributed free. Users can download it and use it without paying at all, and Mr Shuttleworth's company, Canonical, will even post a free installation compact disc to anyone who requests it.

This is possible because of Mr Shuttleworth's vast fortune. He made $575m (£327m) selling his internet company, Thawte Consulting, in 1999, and invests about $10m a year in Ubuntu. It is unlikely to make him any money, at least not for several years. Canonical sells support and related services for Ubuntu, but Mr Shuttleworth has no firm idea about when it will make a profit.

He launched the project because he believes he is in the vanguard of a revolution. "It is very high risk," he says. "It is not a sensible business model. But shaping the digital platform of the future is an incredibly interesting position to be in."

He has certainly created a powerful and effective desktop software package. From its commitment to freedom to its quirky public image, Ubuntu has many appealing features and considerable momentum. However, to continue growing at the current rate, it will need to expand beyond its existing technology-savvy base to embrace people with no prior experience of Linux.

Linux consultant and author Tom Adelstein thinks it is still hard for such people to use. "From a usability point of view, Ubuntu is ahead of the others, I think. But it is still in the Linux bag - you have to be computer literate to use it. Microsoft is still far ahead on that." Likewise, many buyers will be put off by the fact that a number of programs, notably games, are not available for Linux systems.

Few of those target users would install an operating system themselves. So a key stage in Ubuntu's growth will be persuading PC makers to sell machines with Ubuntu already installed. Some computer makers already ship PCs with Linux suites such as Linspire.

Smaller PC makers, competing at the lower end of the market, are particularly interested in free software, as it helps them to cut their prices. Small companies account for one-third of the global market, according to research company IDC, and Mr Shuttleworth is soon to visit Taiwan to open negotiations with some of them.

Corporate and government desktops may also be fertile ground for growth. A survey by Forrester, the research company, found that 30 per cent of companies in North America are considering switching some or all of their desktops to Linux.

Among those changing is Google, which has developed its own version of Ubuntu, called Goobuntu. Mr Shuttleworth says he is also in talks with the city government in Munich about creating an edition of Ubuntu for them.

This ability to customise Linux is a big selling point, and Canonical is developing an easy way for corporations to design and maintain specific versions of Ubuntu to suit their exact needs.

Although a stock-market darling such as Google may seem an excellent reference customer, it has an intense rivalry with Microsoft so it is keener than average to try alternatives to Windows. Other organisations will need more convincing reasons to adopt Ubuntu. Being free is clearly an advantage and Linux advocates argue that the security and robustness of Linux products are superior to those of Windows, although these issues are hotly debated.

Mr Shuttleworth has managed to rally one important group around his standard: developers. Canonical has just 50 staff, but Ubuntu has attracted many thousands of engineers at partner companies, as well as volunteers and students, who do most of the work of extending and improving the software.

The Ubuntu community has a reputation for friendliness - which is important when you are not being paid. Also, many developers who dislike the increasing commercialisation of other Linux projects are attracted by Ubuntu's commitment to remaining free.

However, selling Ubuntu beyond the circle of geeky initiates will require a massive marketing and education process, and even Mr Shuttleworth's deep pockets are no match for the budgets of Microsoft and Apple. He hopes that the virtues of a free, open operating system will sell themselves.

"My instinct tells me that free software is going to be a significant force on the desktop," he says. "Whether that is an Apple Mac-like force of 3-5 per cent; or whether that is a Linux in the data centre [on servers] force, that is 50 per cent and growing really, really fast - I don't know."

With no serious business plan, it would be easy to dismiss Ubuntu as the plaything of a whimsical hobbyist that will not go far beyond the geek fraternity. Can a Breezy Badger really be a serious challenge to a titan like Microsoft?

During his interview with the Financial Times, Mr Shuttleworth sits across his chair with both legs on the armrest, as if it were a hammock - not something you imagine Larry Ellison, Oracle's chief executive, doing.

But he has an impressive record, and you certainly cannot question his dedication. He is currently on a gruelling three-week world tour in his private jet, promoting Ubuntu and making contacts in Croatia, Pakistan, India, China, Indonesia and Kenya. After that, he plans to "unwind" by meeting other enthusiasts for free software in, of all places, the war-torn republic of Sierra Leone.

For some, Mr Shuttleworth just seems to be having too much fun to be taken seriously. But Linux has surprised many people before - there is nothing a geek finds more fun than turning a whole industry on its head.


A STELLAR CAREER
Mark Shuttleworth has no clear idea of when his new venture will make a profit but, based on his past experience, tech watchers are treating the project seriously.

*Mark Shuttleworth made his fortune in 1999, when Thawte Consulting, the company he started in a garage in Cape Town, was bought by VeriSign for $575m. An e-commerce security company, it did much to make the explosion of online retailing possible, and its technology is still widely used today.

*In 2002, he spent $20m to join the Russian space programme as a cosmonaut, training for a year before blasting off from a launch pad in Kazakhstan. He was the first African in orbit and the world's second paying visitor to space.

*After spending some time "sowing my wild oats and enjoying the world", he decided to put his financial and intellectual weight into a free software system for the desktop, Ubuntu. "I was struck by the incredible pace of change in free software to the desktop. It seemed to me that the key developers in the free software world had identified the desktop as the next interesting problem," he says. For him, it was a return tohis origins, as the technology his first company developed was based on Linux. "It was only possible for me to build Thawte because of the existence of Linux," he says.

Copyright (c) Ben King MMVI


REF: https://web.archive.org/web/20101115224130/http://www.benking.co.uk/art/Ubuntu_the_entrepreneur_who_wants_to_give_it_all_away.php

terça-feira, 13 de março de 2018

BYD e6 at Belo Horizonte capital of Minas Gerais

BYD e6 van style utility truck at garage of state of Minas Gerias government main build of capital city of Belo Horizonte.





The charging point:


quarta-feira, 29 de novembro de 2017

LTSPICE - How to use cursors and read values from plots

LTSpice, Reading values from plot

After you have plotted a waveform, you can left-click on the waveform node-title label at the top of the graph window which will set a cursor cross-bar and with popup a new floating window with the cursor position information.



Move your pointer over the new cross-bar and a number "1" will appear.  If you now left-click the number that is showing you will be able to move along the graph and position the cursor.

If you click again over the node-title label then you will get the second cursor (ie. the cursor number 2) which will give the absolute value at each cursor position and the difference between the two cursor positions in the popup information window.

To remove the cursor(s) just close the popup information window.

REF: https://forum.allaboutcircuits.com/threads/ltspice-reading-values-from-plot.95390/

domingo, 1 de outubro de 2017

Understanding Connector: SMA


The SMA connector(SubMiniature version A) is a 50 ohm coaxial connector. It is visually similar to an F type connector that is commonly used for audio/video communication, but has different dimensions, mechanical properties and is used for different applications such as RF communications up to 18 GHz. Due to its construction, SMA connectors provide a strong and durable connection that minimizes reflections, limiting attenuation, and makes it a great choice when working with microwave frequencies.

SMA Male Connector

The SMA male connector is identified by inside 1/4″-36 threads and a 5/16″ hex nut. A standard polarity connector will have a male pin.

SMA Male Dimensions

  • Outer Diameter: 6.35mm
  • Inner Diameter: 4.59mm
  • Pin Diameter: .97mm
  • Pin Tip Diameter: .38mm 


SMA Female Connector

The SMA female connector is identified by outside 1/4″-36 threads. A standard polarity connector will have a female sleeve.

SMA Female Dimensions
    • Outer Diameter: 5.49mm
    • Inner Diameter: 4.60mm
    • Pin Insert Diameter: 1.30m



    Reverse Polarity (RP) SMA Male Connector 

    The RP SMA male connector is identified by inside 1/4″-36 threads and a 5/16″ hex nut. It will not have a male pin, but will have a female sleeve.

    RP SMA Male Dimensions

    • Outer Diameter: 6.35mm
    • Inner Diameter: 4.59mm
    • Pin Insert Diameter: 1.30mm



    Reverse Polarity (RP) SMA Female Connector

    The SMA female connector is identified by outside 1/4″-36 threads. A standard polarity connector will not have a female sleeve, but will have a male pin.

    RP SMA Female Dimensions
    • Outer Diameter: 5.49mm
    • Inner Diameter: 4.60mm
    • Pin Diameter: .97mm
    • Pin Tip Diameter: .38mm



    REF: http://blog.showmecables.com/author/showmecables/