The thermal rolls of print media of this invention comprise a core/spindle and a sheet, preferably continuous, of a print medium of substantially the same width as the core/spindle. The sheet of print medium is wound around the core/spindle to provide a thickness of layered paper on the core/spindle of at least one half inch, measured from the periphery of the core/spindle to the outer layer of the sheet of print medium on the roll. At least one side of the wound sheet of print medium is marked with at least one impression which serves as an identifying mark. The "sides" of the roll of a print medium, as referred to herein, are where the edges of the wound print medium are exposed. The term "impression" as used herein includes shallow indentations as well as realignment of the edges of the wound print medium and realignment of the fibers within the wound print medium. In realigning the edges and/or fibers of the wound print medium, there may be no indentation which is detectable and in certain embodiments, no indentation at all.
Thermal paper rolls in the past is no longer true. While thermal tape used to be an uncommon alternative due to a short lifespan and high prices, it's now the most viable choice. Recent developments have led to better technology, including advanced chemical films and more durable substrata.
The rolling force and roll deformation behavior in the twin-roll-type strip continuous casting process have been computed to estimate the thermal characteristics of a caster roll. To calculate the rolling force, the relationship between the flow stress and strain for a roll material and a casting alloy are assumed as a function of the strain rate and temperature, because the mechanical properties of casting materials depend on temperature. Temperature field data for a caster roll, provided by the authors, were used to estimate the roll deformation. Therfore, numerical models considering the thermal and rolling forces have been developed to estimate the roll life. Roll life considering the thermal cycle is calculated using thermal elastic-plastic analysis results. The roll life is proposed in terms of roll revolution in the caster roll models with and without the fine crack failure on the roll surface. To obtain plastic strain distributions of the caster roll, thermomechanical properties of a roll sleeve with a copper alloy are obtained by a uniaxial tensile test for variation of temperature. The proposed analysis techniques have improved in caster roll design.
30.12.08
28.12.08
Take Care Of You Laptop Battery Or Else...
Laptops are common now; most people have them to take to school or when they travel for work. They're useful and easy to move with. What is also common is to see someone scrambling to find a place to charge a laptop battery. That report due tomorrow may suddenly be lost if you don't find an outlet within thirty seconds... Or that slideshow you have created (but carelessly forgot to save) may disappear if your laptop battery is not recharged.
As common as laptops are now, it is just as common to see individuals forgetting that the machine needs a little bit of help to run. It does not magically power itself; the battery does not somehow manage to stay full as you work for hours at a time. Yet, many seem to think that their battery does just that. No matter how long they stay hunched over the machine, it will work.
A few times of having the laptop die will cure that fantasy.
The truth is: you must keep your laptop charged. Yes, one of the advantages of having a laptop is that you can take it anywhere; it does not require you to remain plugged into the wall. That still does not mean that you can expect the laptop to run with a low battery. Yes, you can walk around with it; yes, you can wander away from your plug. You still should return, however, when your computer tells you it's low.
And they do tell you. Laptops feature a symbol at the top of the screen that allows you to see just how much your battery is charged. The lower it drops, the less time you have. This is basic. Anyone will even a small trace of knowledge should know and understand this. Yet, too many people risk losing everything to squeeze out an extra minute on their battery. These are the same people who try to frantically finish a report as opposed to saving and heading to their charger, only to lose the majority of it when the computer quits. And these are the same people who swear they will never do it again, but forget that promise the next time around.
Laptop batteries have short ives. They can fail as quickly as thirty minutes. Some last longer, of course, but the result is still the same: if you are not careful and don't pay attention, the battery will die. Of course, laptops offer warnings when a battery is low. Often, a small screen will pop up to remind you that the time is almost there. Still, thinking you can simply ignore that screen since you're busy is not the wisest of moves.
This are basic ideas, and you may be rolling your eyes, wondering who would be so foolish. But it does happen, all-too-often it happens. Because of this, you must make an effort to remember that, as convenient as your laptop is, it is still a machine and therefore needs care. Check your laptop battery and keep it charged.
As common as laptops are now, it is just as common to see individuals forgetting that the machine needs a little bit of help to run. It does not magically power itself; the battery does not somehow manage to stay full as you work for hours at a time. Yet, many seem to think that their battery does just that. No matter how long they stay hunched over the machine, it will work.
A few times of having the laptop die will cure that fantasy.
The truth is: you must keep your laptop charged. Yes, one of the advantages of having a laptop is that you can take it anywhere; it does not require you to remain plugged into the wall. That still does not mean that you can expect the laptop to run with a low battery. Yes, you can walk around with it; yes, you can wander away from your plug. You still should return, however, when your computer tells you it's low.
And they do tell you. Laptops feature a symbol at the top of the screen that allows you to see just how much your battery is charged. The lower it drops, the less time you have. This is basic. Anyone will even a small trace of knowledge should know and understand this. Yet, too many people risk losing everything to squeeze out an extra minute on their battery. These are the same people who try to frantically finish a report as opposed to saving and heading to their charger, only to lose the majority of it when the computer quits. And these are the same people who swear they will never do it again, but forget that promise the next time around.
Laptop batteries have short ives. They can fail as quickly as thirty minutes. Some last longer, of course, but the result is still the same: if you are not careful and don't pay attention, the battery will die. Of course, laptops offer warnings when a battery is low. Often, a small screen will pop up to remind you that the time is almost there. Still, thinking you can simply ignore that screen since you're busy is not the wisest of moves.
This are basic ideas, and you may be rolling your eyes, wondering who would be so foolish. But it does happen, all-too-often it happens. Because of this, you must make an effort to remember that, as convenient as your laptop is, it is still a machine and therefore needs care. Check your laptop battery and keep it charged.
25.12.08
Blu-Ray set to take the world by storm!
The Blu-ray Disc belongs to a new generation of optical discs capable of staging high density data. Blu-Ray technology is based on a blue-violet coloured laser. The blue laser operates at a wave length of 405 nm, while older technology such as DVDs and CDs are based on red and infrared lasers that works at 650 and 780 nm. Since the wave length is shorter with a blue laser, the new Blu-ray technology makes is possible to store much more information
The advantage with the Blu-ray technology is that the laser beam can be focused much more tightly at the surface of the disc. Tight focus means that a smaller spot will be produced on the surface on the disc, and when the spots become smaller there will naturally be room for more information on each disc. The minimum spot size of any laser depends on a naturally accruing phenomenon called diffraction. The narrow beam of light sent out from a laser will always diverge into a wider beam eventually, due to the natural diffraction of waves. Diffraction will also occur the waves meet an obstruction. By reducing the wavelength of a laser, we can affect the diffraction.
In Blu-ray technology, the diffractions is also affected by the fact that the lens used to focus the light has a higher numerical aperture than the lenses found in ordinary DVDs - 0.85 instead of 0.6. Blu-ray technology based appliances are also equipped with a dual-lens system of supreme quality, and the cover layer has been made thinner in order to prevent unwanted optical effects. All this makes it possible for a Blu-ray laser to focus on much smaller spots. The optical improvements are accompanied with a new method for encoding data which makes it possible to store even more data on the Blu-ray disc.
The standard for Blu-ray technology has been developed as a joint venture between several major manufacturers of PCs and consumer electronics, including Sony and Philips. The group is called the Blu-ray Disc Association (BDA). The first Blu-ray recorder was launched in Japan in 2003, by Sony. Today, Samsung, JVC, Matsushita (Panasonic) and LG Electronics are all examples of companies using Blu-ray technology in their products. Hewlett Packard has announced that they will release desktop PCs equipped with Blu-ray technology in late 2005.
The main competitor for the Blu-ray technology is the HD DVD format which is also capable of storing more information than a normal DVD. The Blu-ray technology does however allow for more information per layer than the HD DVD format – 25 GB compared to 15 GB. The Blu-ray technology will on the other hand most likely be more expensive to support, at least initially, which can make the HD DVD a tempting alternative. In a Blu-ray disc, the data is stored extremely close to the surface. This made the first Blu-ray discs extremely vulnerable to scratching and many users preferred the tougher HD DVD discs. Since 2004, all Blu-ray discs are coated with a clear polymer called “Durabis” which makes them much more durable. According to the developers of Durabis, the TDK Corporation, a coated Blu-ray disc will work even after being attacked with a screwdriver.
The advantage with the Blu-ray technology is that the laser beam can be focused much more tightly at the surface of the disc. Tight focus means that a smaller spot will be produced on the surface on the disc, and when the spots become smaller there will naturally be room for more information on each disc. The minimum spot size of any laser depends on a naturally accruing phenomenon called diffraction. The narrow beam of light sent out from a laser will always diverge into a wider beam eventually, due to the natural diffraction of waves. Diffraction will also occur the waves meet an obstruction. By reducing the wavelength of a laser, we can affect the diffraction.
In Blu-ray technology, the diffractions is also affected by the fact that the lens used to focus the light has a higher numerical aperture than the lenses found in ordinary DVDs - 0.85 instead of 0.6. Blu-ray technology based appliances are also equipped with a dual-lens system of supreme quality, and the cover layer has been made thinner in order to prevent unwanted optical effects. All this makes it possible for a Blu-ray laser to focus on much smaller spots. The optical improvements are accompanied with a new method for encoding data which makes it possible to store even more data on the Blu-ray disc.
The standard for Blu-ray technology has been developed as a joint venture between several major manufacturers of PCs and consumer electronics, including Sony and Philips. The group is called the Blu-ray Disc Association (BDA). The first Blu-ray recorder was launched in Japan in 2003, by Sony. Today, Samsung, JVC, Matsushita (Panasonic) and LG Electronics are all examples of companies using Blu-ray technology in their products. Hewlett Packard has announced that they will release desktop PCs equipped with Blu-ray technology in late 2005.
The main competitor for the Blu-ray technology is the HD DVD format which is also capable of storing more information than a normal DVD. The Blu-ray technology does however allow for more information per layer than the HD DVD format – 25 GB compared to 15 GB. The Blu-ray technology will on the other hand most likely be more expensive to support, at least initially, which can make the HD DVD a tempting alternative. In a Blu-ray disc, the data is stored extremely close to the surface. This made the first Blu-ray discs extremely vulnerable to scratching and many users preferred the tougher HD DVD discs. Since 2004, all Blu-ray discs are coated with a clear polymer called “Durabis” which makes them much more durable. According to the developers of Durabis, the TDK Corporation, a coated Blu-ray disc will work even after being attacked with a screwdriver.
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