Energy storage is one technology that has not obeyed Moore’s law.  This is clearly the case in smartphones–I often see heavy users plug in their phones everywhere they go to maintain enough juice to last the entire day.

In contrast, my dumb phone holds enough charge to last 4 days on standby. The bottom line is that the more functionality your mobile device has, the shorter the battery life will be. These features include 4G antennas, multitasking apps, push notifications, WiFi/Bluetooth activity, background processes, and flash camera use.

I’m often asked for tips to prolong battery life on the iPhone 4S. For those without the software glitch, here are a few suggestions (some are phone agnostic):

• Shut down background apps. Back when I was writing TSR‘s, I learned that background processes with leaky memory will throttle cpu big time. On the iPhone 4S, hold the Home button until a list of apps appears on the screen. Hold onto one of the icons until they start shaking. You will also see a red negative sign. Hit the sign to shut down the apps. This is most useful in apps that require net access. On Android, you can use Advanced Task Killer.
• Disable Bluetooth when not in use. Obvious.
• Disable cell signal if you are in poor reception areas. If you’re not expecting calls or texts, this is the way to go.
• Disable push notifications on non-urgent apps.  Tricky. If you’re a day trader and rely on your texting/phone vibration for your job, you may be out of luck. You can also increase polling time.
• Disable Flash. Pertinent to Android devices. Yes, Flash is a battery killer.

There are many “disables” on this list. There are also a dozen other minor tweaks that can be found online. Be aware that apps typically aren’t screened as closely for memory leaks or routines that potentially cycle cpu time without effect. Your battery life will greatly depend on the apps you use daily.  Unfortunately we are still limited by our technology, but perhaps these recommendations will help get you through the day.

computing computing, tech

Dimmer switches are a great option to control the amount of lighting needed in a certain venue. This also serves to limit unnecessary energy costs. What people don’t realize is that combining dimmer switches with compact fluorescent bulbs (CFL) is usually counterproductive; you not only get impure light, but also a shortened lifespan of the bulb.

I wrote about CFL’s in a previous entry. Many of these bulbs have come a long way, and produce high quality lighting. However, the standard CFL’s don’t play well with dimmer switches. Our amphitheater in the eye institute uses CFL’s on the dimmer, and the lights do not dim. In fact, they flicker.

Dimmer switches contain a triac circuit that cuts off the current to save electricity. This works for incandescent bulbs to cut back on heat production. With CFL’s, the interrupted current from a dimmer prevents adequate charge of the gas to produce light. The result is a dim, flickering light.

Installation of dimmable CFL’s would remedy the problem partially, but still may not be effective without changing the switch as well. Most dimmer switches are rated down to 40W of power–any draw below this cannot be controlled adequately. Given that most CFL’s draw less than 40W of power, one would need to replace the entire circuit.

The solution? I can think of two ways:

1. Continue using incandescent bulbs for your dimmer switches
2. Replace your dimmer switch
   with one rated for use with CFL’s, and replace your bulbs with dimmable CFL’s

misc tech

Many DSL providers offer a free (after rebate) DSL modem/router combo in return for an annual contract. For most of us without spare tech gadgets lying around, this is a great option to get online quickly. For the internet provider, this is a means to fulfill an agreement with the hardware manufacturers.

Unfortunately for the consumer, the modems provided are crap.

For instance AT&T offers some customers a variant of a DSL router manufactured by 2Wire. While the modems themselves are easy to install and relatively maintenance-free, I’ve heard nothing but trouble from those that experience problems. One of my friends’ 2Wire modems fizzled out soon after the 1-year warranty agreement by AT&T. The modem booted up, but the power light would remain red. Hard resets and power cycling did nothing to the modem. The model was a 2700-HGB. AT&T suggested to her to buy a new modem (for >$79). I found several online accounts similar problems with these modems, and it turns out to be a faulty capacitor in the modem or a faulty power supply.

The power supply unit offered by 2Wire cannot be purchased separately. However, several electronic devices in the market use a similar 5.1V head. The quick fix for the 2Wire 2700H-GB power supply is a PSP power adapter (like this). For a mere $5, you can get your modem back and running again. If it doesn’t work, you’re only down $5.

computing tech

Those of you who are still hanging onto Windows XP should be relieved that M$‘s aging operating system still has life left for routine computing purposes. After all, the termination date for all hotfixes that M$ has set for WinXP is April 8, 2014. That should be plenty of time to maintain your beast of a desktop or laptop in commission until the next generation hardware is released.

I’ve collected a bit of tweaks throughout the years to help keep my copy of XP competitive on older hardware. I’ve decided to post a list of optimization techniques for Windows XP, mainly for myself and those of you who still may be using this operating system. Refer to my previous guide on netbook optimization, as some of these suggestions overlap.

Firstly, these tips are not specific to any hardware, although some systems may not be amenable to these tweaks. Laptops, in particular, have specific drivers that may be required to function properly. Be warned.  Secondly, I expect a minimum baseline in your system (ie Pentium 2 is unlikely to respond as well as a Pentium 4).

1. Memory. No matter what type of computer you have, you need memory. From my experience in ECE110 (operating systems) in college, the memory will give a higher end-user speed improvement over clock speed (although clock speed is what drives the electric current to the memory). You should have at least 1gb in your system. If your computer is too old to warrant a memory upgrade and has too little (256mb), then any sort of optimization will be limited.
2. Stop indexing. My Computer->Right Click hard disk->uncheck “Allow indexing Service to index this disk for fast searching”. You don’t need this.
3. Stop unnecessary services. There are specific services that are required for your system. Check to make sure which ones you need, and cut out the ones you don’t. Go to Start->Run->”services.msc”. There is a list of services that you can uncheck. A few that I have found to be useless for the average home user include:
   1. Error Reporting Service
   2. Help and Support (Who ever uses this?)
   3. Fast User Switching (If you had enough power to support multi-user logins, you needn’t be using this article)
   4. Telephony
   5. Anything with “Remote Desktop”. Security hole.
   6. Messenger. No way.
4. Cut some of those special effects. You probably don’t need most of them: Control Panel->System->Advanced->Performance->Settings. Uncheck the drop shadows and visual styles.
5. Optimize startup. Cut out Office Launcher and Acrobat startup. Let them load on first run of opening Word/PDF files. If your taskbar is over a fifth of your desktop width, then you might have too many startup programs.
6. Ditch Symantec Antivirus. This program has memory leaks. I don’t understand why some universities still purchase a site license for this useless software. If you need antivirus, use something like Comodo Internet Security.
7. Try Bootvis. It can optimize startup order. It sped up my startup by 10 seconds!
8. Ditch some unnecessary fonts. Excess fonts that you never use can bog down word processing and any graphics editors that you use. Control Panel->Fonts. Choose some to remove. Just don’t forget to keep the basics.
9. Use a tweaking application. I used to use TweakUI, which eventually became encompassed by PowerToys. X-Setup is an extreme tweaking app that I found pretty helpful. You can enable “fast updates”, disable tooltips, and other optimization hacks. I obtained a noticeable speed increase after using this tool.
10. Remove unnecessary programs. Some of the programs that you installed and used once can have startup functions that slow down the boot process.

That’s it! These basic tweaks can bring life to any aging Windows XP system.

computing tech

Interesting use. Could someone elaborate?

medicine medicine, tech