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2011年10月20日星期四

Nanostuff Lets laptops Remake Themselves

Scientists at Northwestern college have created a manufacturer new nanomaterial that may reconfigure by itself by directing the flow of current.
This could cause personal computers that may reconfigure their inner circuitry as needed.
The hybrid material, made with a group led by Bartos Grzybowski, professor of substance and biological engineering and chemistry at NWU, combines several elements of silicon- and polymer-based electronics to produce nanoparticle-based electronics.
It can manage streams of electrons flowing in multiple, as well as opposing, directions at exactly the same time.
Long method to Go
However, a self-reconfiguring pc isn't during the performs any time soon.
"This is recognized as a very, pretty lengthy way from commercialization," JoAnne Feeney, vice president and senior semiconductor analyst at Longbow Research, informed TechNewsWorld.
"It took the marketplace ten to 15 many years to sort out FinFet transistors, and that was merely a fairly minor alter in transistor structure," Feeney elaborated. "This is much a whole lot more ambitious."
FinFet transistors certainly are a sort of double-gate transistors.
The NWU group released their findings in Nature.com.
Team people do not respond to requests for comment by press time.
The generating belonging to the materials
The researchers employed toluene to dissolve gold and tetrabutylammonium borohydride, recognized as "TBAB," in separate vials.
TBAB is recognized as a selective cutting down agent.
Loosely speaking, they blended the two, stirred the outcome immediately to type gold nanoparticles, and additional an additional gold salt alternative to this, stirring vigorously.
Then, a alternative consisting of hydrazine monohydrate dissolved in toluene was added, and also the outcome stirred overnight.
More chemical compounds have been additional as nicely as other methods carried out. The procedure is described here.
What's New, Pussycat?
The NWU group was generating a switchable nanomaterial -- a materials that may alter its components and capabilities in response to exterior stimuli.
Such elements have prospective functions in electronics, sensing and catalysis, the researchers said.
Previously, researchers employed molecular switches to build switchable nanomaterials, however the NWU group showed that electric conductance via films of gold nanoparticles coated using a monolayer of charged ligands may be employed instead.
Ligands are ions or molecules that bind to some middle steel atom to type a coordination complex.
The hybrid materials created through the study group consists of electrically conductive particles coated using a positively charged substance and surrounded by negatively charged atoms.
When an electric cost is utilized towards material, the damaging atoms may be moved and reconfigured, however the good particles, that are larger, won't move.
Pushing and pulling the damaging atoms erases aged paths and crates new ones. utilizing various sorts of nanoparticles can produce a whole lot more complicated electric elements for instance diodes and transistors.
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2011年6月8日星期三

Difficulties with Testing Battery

It is possible that battery testers used in service garages did not detect the batteries correctly before they were returned under warranty. ADAC* reported in 2008 that 40 percent of all roadside automotive failures are battery-related. In Japan, battery failure is the largest single complaint among new car owners. The average car is driven 13km (8 miles) per day and mostly in congested cities. The most common reason for battery failure is undercharge. Battery performance is important; problems during the warranty period tarnish customer satisfaction.

Battery malfunction during the warranty period is seldom a factory defect; driving habits are the culprits. A manufacturer of German-made starter batteries stated that factory defects account for only 5 to 7 percent of warranty claims. The aspire one battery remains a weak link, and is evident when reviewing the ADAC 2008 report for the year 2007. The study examines the breakdowns of 1.95 million vehicles six years old or less, and Table 1 provides the reasons.

Most common car failures

The cellular phone industry experiences an even more astonishing aspire one battery return pattern. Nine out of 10 batteries returned under warranty have no problem or can easily be serviced. This is no fault of the manufacturers but they pay a price that is ultimately charged to the user.

Part of the problem lies in the difficulty of testing batteries at the consumer level, and this applies to storefronts and service garages alike. Battery rapid-test methods seem to dwell in medieval times, and this is especially evident when comparing advancements made on other fronts. We don’t even have a reliable method to estimate state-of-charge — most of such measurements using voltage and coulomb counting are guesswork. Assessing capacity, the most reliable health indicator of a battery, dwells far behind.

The battery user may ask why the industry is lagging so far behind. The answer is simple: battery testing and monitoring is far more complex than outsiders perceive it. As there is no single diagnostic device that can assess the health of a person, so are there no instruments that can quickly check the state-of-health of a battery. Like the human body, batteries can have many hidden deficiencies that no single tester is able to identify with certainly. Yes, we can apply a discharge, but this takes the aspire 3000 battery,aspire 3680 battery out of service and induces stress, especially on large systems. In some cases, even a discharge does not provide conclusive results either. Read more about Discharge Methods.

As doctors will examine a patient with different devices, so also does a battery need several approaches to find anomalies. A dead battery is easy to measure and all testers can do this. The challenge comes in evaluating a aspire 3000 battery,aspire 3680 battery in the 80 to 100 percent performance range. This chapter examines current and futuristic methods and how they stand up. One thing to remember is this: batteries cannot be measured; the appropriate instruments can only make predictions or estimations. This is synonymous with a doctor examining a patient, or the weatherman predicting the weather. All findings are estimations with various degrees of accuracies.