computer

TED: Technology, Entertainment, Design

Posted on February 05, 2010
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TED is a small nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with the annual TED Conference in Long Beach, California, and the TEDGlobal conference in Oxford UK, TED includes the award-winning TEDTalks video site, the Open Translation Program, the new TEDx community program, this year’s TEDIndia Conference and the annual TED Prize.

You’ll find a lot of interesting movie inside, I personally like it, and truly contains Ideas Worth Spreading.
Invest your spare time to look around inside, I’m sure it would be time worth spending!

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Apple – iPad

Posted on January 28, 2010
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okay, I admit, on my first look, I didn’t really like it,
after watching the video, hmm, it doesn’t hurt to have one..
wow, anyone want to buy me one of this??

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smarter in battery charging

Posted on January 28, 2010
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I know there’s a lot of rumors going on about how is the best way to maintain ur phone/laptop battery, some says “wait until the battery runs out then charge it, and immediately pull the charger when it’s 100%”, some say “charge it overnight”, some say “use it often, and charge it often”. Okay so here’s some tips and tricks I get from battery university:

Simple Guidelines

  • Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.) Short battery life in a laptop is mainly cause by heat rather than charge / discharge patterns.
  • Batteries with fuel gauge (laptops) should be calibrated by applying a deliberate full discharge once every 30 charges. Running the pack down in the equipment does this. If ignored, the fuel gauge will become increasingly less accurate and in some cases cut off the device prematurely.
  • Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage, keep the battery at a 40% charge level.
  • Consider removing the battery from a laptop when running on fixed power. (Some laptop manufacturers are concerned about dust and moisture accumulating inside the battery casing.)
  • Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing dates. Do not buy old stock, even if sold at clearance prices.
  • If you have a spare lithium-ion battery, use one to the fullest and keep the other cool by placing it in the refrigerator. Do not freeze the battery. For best results, store the battery at 40% state-of-charge.

Do and don’t battery table (BU22)

Each battery has unique needs that must be met to obtain reliable service and long life. The Do and Don’t battery table summarizes these needs and advises proper handling of each battery type.

Optimal handling may not always be practical in real life. Deviations from the ideal are acceptable but will lower the life expectancy of the battery to some degree. Exposure to heat may be the larger deterrent.

- Nickel-cadmium
(NiCd)
Nickel-metal-hydride (NiMH) Lithium-ion
(Li-ion)
Lead-acid
(Sealed or flooded)
Used in Two-way radios, power tools, medical. Similar application as NiCd; higher density. Cell phones, laptops, video cameras. Motorcycles, cars, wheelchairs, UPS.
Charging Do run the battery fully down once per month; try to use up all energy before charging.

Do not leave battery in charger for more than 2 days because of memory.

Avoid getting battery too hot during charge.

Charge methods: Constant current, followed by trickle charge when full. Fast-charge preferred over slow charge.
Slow charge = 16h
Rapid charge = 3h
Fast charge = 1h+

Do run the battery fully down once every 3 months. Over-cycling is not advised.

Do not leave battery in charger for more than 2 days because of memory.

Avoid getting battery too hot during charge.

Charge methods:
Constant current, followed by trickle charge when full. Slow charge not recommended.
Battery will get warm towards full charge.
Rapid charge = 3h
Fast charge = 1h+

Do charge the battery often. The battery lasts longer with partial rather than full discharges.

Do not use if pack gets hot during charge. Check also charger.

Charge methods: Constant voltage to 4.20V/cell (typical). No trickle-charge when full. Li-ion may remain in the charger (no memory). Battery must remain cool. No fast-charge possible.

Rapid charge = 3h

Do charge the battery immediately after use. Lead-acid must always be kept in a charged condition. The battery lasts longer with partial rather than full discharges. Over-cycling is not advised.

Charge methods: Constant voltage to 2.40/cell (typical), followed by float held at 2.25V/cell.
Battery must remain cool. Fast charge not possible; can remain on float charge.

Slow charge = 14h
Rapid charge = 10h

Discharging Full cycle does not harm NiCd.
NiCd is one of the most hardy and durable chemistries.
Avoid too many full cycles because of wear. Use 80% depth-of-discharge.
NiMH has higher energy density than NiCd at the expense of shorter cycle life.
Avoid full cycle because of wear. 80% depth-of-discharge recommended. Re- charge more often. Avoid full discharge. Low voltage may cut off safety circuit Avoid full cycle because of wear. Use 80% depth-of-discharge. Recharge more often or use larger battery.
Low energy density limits lead-acid to wheeled applications
Service needs Discharge to 1V/cell every 1 to 2 months to prevent memory.
Do not discharge before each charge.
Discharge to 1V/cell every 3 months to prevent memory.
Do not discharge before each charge
No maintenance needed. Loses capacity due to aging whether used or not. Apply topping charge every 6 months. Occasional discharge/ charge may improve performance.
Storage Best to store at 40% charge in a cool place. Open terminal voltage cannot determine state-of-charge. 5 years and longer storage possible. Prime battery if stored longer than 6 months. Store at 40% charge in a cool place. Open terminal voltage cannot determine state-of-charge. Prime battery if stored longer than 6 months. Store at 40% charge in a cool place (40% state-of-charge reads 3.75-3.80V/cell at open terminal.
Do not store at full charge and at warm temperatures because of accelerated aging.
Store always at a full state-of-charge. Do not store below 2.10V/cell; apply topping charge very 6 months.
Disposal Do not dispose; contains toxic metals; must be recycled. Should be recycled. Low volume household NiMH may be disposed. Should be recycled. Low volume household Li-ion may be disposed Do not dispose; must be recycled.


_________________________
Created: May 2003, Last edited:March 2004




About the Author

Isidor Buchmann is the founder and CEO of Cadex Electronics Inc., in Vancouver BC.
Mr. Buchmann has a background in radio communications and has studied the behavior of rechargeable batteries in practical, everyday applications for two decades. Award winning author of many articles and books on batteries, Mr. Buchmann has delivered technical papers around the world.
Cadex Electronics is a manufacturer of advanced battery chargers, battery analyzers and PC software. For product information please visit www.cadex.com.

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Sun’s CEO announcing that he is resigning

Posted on January 22, 2010
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The European Commission approved Oracle’s $7.4 billion acquisition of Sun Microsystems and it only took a few hours for an internal memo to go out from Jonathan Schwartz, Sun’s CEO, announcing that he is resigning. Go Oracle! he told Sun employees. There’s more to the story, though.

In his memo, Schwartz, a very highly regarded person in the open source community, who once had a widely followed blog that he eventually posted to less and less, noted the fact that Europe’s approval of the Oracle acquisition took nine months — a long time. Schwartz has, partly because of the rules surrounding proposed acquisitions, been very silent during that time. In today’s internal memo, he refers to the impact that “change in control” has upon any acquisition and describes how broadly it will affect all Sun employees:

Believe it or not, it’s been more than nine months since Oracle first announced their intent to acquire Sun in April, 2009. And the ‘interim’ period has been tough on everyone–on our employees, and our partners and customers. Thankfully, that interim period is coming to an end, with regulatory approval from the European Union issued today, and only a few hurdles remaining–before Oracle formally expands beyond software to become the world’s most important systems company.

Even though we’re not quite across the finish line, I wanted to leave you with a few final thoughts.

All in all, it’s been an honor and privilege to work together. In my more than twenty years in the industry, the last thirteen at Sun, I’ve had a chance to work with and around an enormous diversity of companies, from every sector you can imagine. I can say with conviction that Sun’s people have always stood apart as the brightest, most passionate, and most inspiring. I’ve never had a bad day in my thirteen years for one very basic reason–I’ve always been surrounded by the best and brightest individuals I’ve ever come across. That’s been an honor and privilege, for which I’m enormously thankful.

Technology from Sun, alongside our employees and partners, have changed the world. We’ve opened markets, elections and economies. We’ve helped build the world’s most important and valuable businesses. We’ve played a key role in discovering new drugs, in bringing education and healthcare to those in need, and supplying the world with an incredible spectrum of entertainment, from smartphones to social networking. I doubt any company has had such a significant influence over the way we see or experience the world. I once told Scott McNealy he was the Henry Ford of the technology industry, making remarkable innovations accessible to anyone, and creating an immense number of jobs around the globe for those that made use of them. I can’t begin to tell you how proud I am of my association with that cause and the people behind it, and the value we created for ourselves and those that exploited our innovations.

I also know we’ve had more than our share of very tough challenges. Amidst the toughest market and customer situations imaginable, I’m proud we’ve always acted with integrity, with a sense for what’s right, and not simply what’s expedient. Over the years, I’ve heard time and again, from those inside and outside the company, “I like and I trust Sun.”

Building that good will is something to which you’ve all contributed. And you have every right to be very proud of it.

Make no mistake, it’s been an enormous asset.

So, to the sales and SE teams across the world who continually give their all to bring the numbers home–thank you for the trust you’ve built with customers, and the results you’ve delivered. I hope you’re prepared to have the wind at your back, you deserve it.

To the service professionals who every day build, maintain and run the world’s most important data centers–thank you for your excellence and discipline, 7×24.

To the professionals who run the functions and processes that are the company’s spinal column–thank you, we’d be paralyzed without you.

And lastly – to the engineers and marketers who’ve fostered a perpetual belief that innovation creates its own opportunity – thank you. You’re right. Innovation does create its own opportunity. Like Oracle, we’re an engineering company in our heart and soul, our potential together is limitless.

Now many of you know that I came to Sun when a company I helped to found was acquired in 1996. I’ve also led, and been a part of many, many acquisitions at Sun, both large and small. From those experiences, I’ve learned one very clear lesson–the single most important driver of a successful acquisition are the people involved–and how committed they are to the new owner’s mission.

And the most effective mechanism I’ve seen for driving that commitment begins with a simple, but emotionally difficult step.

Upon change in control, every employee needs to emotionally resign from Sun. Go home, light a candle, and let go of the expectations and assumptions that defined Sun as a workplace. Honor and remember them, but let them go.

For those that ultimately won’t become a part of Oracle, this will be the first step in a new adventure. Sun has a tremendous reputation across the planet, well beyond Silicon Valley. It’s a great brand to have on your resume. We’re known as self-starters, capable of ethically managing through complexity and change, for delivering when called upon, and for inventing and building the future. With the world economy stabilizing, I’m very confident you’ll land on your feet. You’re a talented, tenacious group, and there’s always opportunity for great people.

For those that have roles at Oracle, may you start with a clean slate, ready to take on the myriad opportunities ahead. With the same passion and tenacity for Oracle’s success that you’ve had for Sun’s, and a renewed sense of energy around executing on a far broader mission. There is no doubt in my mind you, and Oracle, will be remarkably successful, beyond the market’s wildest expectations. But it’s important you come to work thinking, “Sun is a brand, Oracle’s my company.” Don’t look for ways to preserve or dwell in “how we used to do things.” Look for ways to help customers, grow the market, and improve Oracle’s performance.

Sun is a brand, Oracle is your company.

And to that end, with nine months of getting to know them, I’ve found Oracle to be truly remarkable, led by remarkable people. From Larry on down, they understand the enormity of the opportunity before them, and they’re more than prepared to execute on it – across the board. I’ve seen their commitment and focus, now they need yours. I’m confident you’ll give it the 10,000% effort it deserves–and we’ll all see the end result.

So thank you, again, for the privilege and honor of working together. The internet’s made the world a far smaller place–so I’m sure we’ll be bumping into one another.

Go Oracle!

Jonathan

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