SomeBackup – Technology Blog

In both science and in technology, a battery is used as a type of device that is used to store energy, making it available for use in an electrical form. They consist of electrochemical devices, including one or even more galvanic cells.

Baghdad Batteries are thought to be the first known in history, dating back from sometime between the years of 250 BCE and 640 BCE. The modern battery began with the Voltaic pile, which was developed by Alessandro Volta, an Italian physicist, in 1800. As of a 2005 estimate, the battery industry generates, no pun intended, around 48 billion dollars in annual sales.

Batteries can be divided into two main categories, rechargeable batteries and non-rechargeable, or disposable, batteries.

Disposable batteries are also known as primary cells. They are intended for a one time use only, to be used until the chemical changes used to induce its electrical current supply have been finished. Their common usages include smaller, more portable devices that have either a low current drain or are used away from any alternative power source.

Rechargeable batteries, also known as secondary cells, have a longer usage life since they can be recharged after their power has been drained. You can do so by applying an externally supplied electrical current. This causes a reversal in the chemical changes that occur during the battery’s use. These devices used to do this are commonly known as rechargers or chargers.

The ‘wet cell,’ or lead-acid, battery is the oldest form of the rechargeable battery that is still in today’s use. This battery contains a liquid found in an unsealed container that requires the battery to be kept in an upright position. The area in which it is used must be well-ventilated so as not to cause the ventilated, hydrogen gas to display its explosive qualities.

The lead-acid battery is quite heavy, although its cost to manufacture is low and the high surge content levels allow it to be a commonly used battery in places where its weight and handling ease are not of any concern.

The most common form of a lead-acid battery is the car battery.

A gel battery is known to be an expensive lead-acid battery type, containing a semi-solid electrolyte that is used to prevent spillage.

The portable types are considered to be ‘dry cells.’ They are sealed units that are useful in appliances such as cell phones and laptop computers. These types of cells also include, nickel-cadmium or NiCd, nickel metal hydride or NiMH, and lithium-ion or Li-Ion, listed in the order of their increasing power density and also their cost.

Both disposable batteries and rechargeable batteries come in various standard sizes. This is so they can easily be used in a wider amount of appliances. The most commonly known types of batteries are the A-series, including A, AA, AAA, and AAAA. Also known are B, C, D, F, G, J, and N. Other variants include 3R12, 4R25, PP3, PP9, and the 996 and PC926 that are used in lanterns. There are many, many more less common battery types, and their usages vary greatly.

As soon as Computerized Tomography or CT scans became accessible in the 1970s, they reformed the practice of neurology. They did the scans by transmitting x-ray streams all the way through the head at different positions and accumulating the x-ray streams on the other side that was not absorbed by the head. A sequence of images come into view on a computer monitor or on an x-ray plate as if the head had been sliced from side to side by a huge salami cutter and the slices were arranged out horizontally and in series.

After that, in the 1980s Magnetic Resonance Imaging or MRI scans came into the picture and astounded the medical society by not just taking an image of the brain itself, but by doing so in a new way. MRIs concentrate on water molecules, as an alternative to imaging the degree to which the various parts of the head absorb x-rays. To be more specific, MRIs represent the speed at which rotating hydrogen atoms of water molecules inside various parts of the brain either line up or fall out of arrangement with a powerful magnetic field. These different values of de-magnetization or magnetization are inputted into a pc. Slice like images are formed in a sequence and put on view on a computer screen or x-ray type film in hues of gray. Irregular compositions, like brain tumors or the signs of multiple sclerosis, are shown in their own hues of gray and are also identifiable by their contours and positions. Getting hold of a different set of images after a hypodermal injection of gadolinium, which is the MRI equivalent of x-ray dye, also adds to analytical information.

For a patient, the incident of having a CT and of having an MRI very much looks a lot like each other. In both situations the patient lies flat on a plane table that moves into and out of a hole in the scanner that looks a lot like an oversize doughnut hole. In the MRI machine the doughnut hole is narrower, so patients suffering from claustrophobia have to notify their doctors if this might be a hitch. Noise is also an issue with the MRI machine. A loud noise is produced every time the radio frequency coils are turned off and on. For either of these two scans the technologist may need to inject a needle in the patient’s vein to dispense a distinct substance.

A situation in which MRIs are basically not done is when the patient has a heart pacemaker. This is for the reason that the MRI machine’s magnet might disturb the pacemaker and stop the heart. No image is so essential and important that this peril would be worth taking. Another situation in which an MRI is evaded is when the patient is gravely ill. A serious patient can be effectively examined and sustained while getting a CT scan, but not while getting an MRI.

A couple of news coming in lately, one is about model Liskula Cohen sues Google for ’skank’: A VOGUE model is suing Google for defamation, and is calling on the search engine giant to reveal the identity of a blogger who has dubbed her an “old hag” and a “skank” on the Internet. The other is about a woman jailed over Anna Nicole blog ’slurs’: A REAL estate agent in Houston who blogged about Anna Nicole Smith was jailed for contempt last week in a defamation case brought by the late Playboy model’s mother. Legal experts said bloggers are increasingly the targets of such litigation, which are testing the bounds of free speech.

The research team found that the absence of a gene known as Sox21 – which it said is shared by humans and mice – can lead to early hair loss.

The scientists biologically engineered mice by blocking the gene and found that the rodents started losing hair on their heads about 15 days after birth and became completely naked a week later.

The Sox21 gene has in the past been shown to be linked to the formation of nerve cells but the Japanese study was the first to indicate its function in ensuring hair retention.

The study, jointly conducted with Hideyuki Okano, professor at the School of Medicine at Tokyo’s Keio University, found that the lack of the gene leads to the improper formation of cuticles, the outer layer of hair.

ASTRONAUTS are giving a behind-the-scenes look at the space shuttle Atlantis’s high-risk mission to service the Hubble telescope, thanks to Twitter.

Mike Massimino, 47, blasted off into space today with six other crew members. But thanks to Twitter, the space veteran is keeping his promise to stay posted, even from space.

“Next stop: Earth Orbit!!” Massimino – whose Twitter account is Astro_Mike – wrote in his most recent tweet, posted just hours before takeoff.

Massimino, one of the mission’s specialists, already has 221,119 followers and had given Twitter updates during training last month in Houston.

“I’ll tweet when I can from orbit, but it might not be much,” Massimino said in an earlier tweet.

The current mission, STS-125, is Massimino’s second space flight. He had previously participated in a Hubble maintenance mission in 2002 (STS-109) during which he performed two spacewalks.