In an underground laboratory in Italy, an international team of scientists has created the coldest cubic meter in the universe. The cooled chamber—roughly the size of a vending machine—was chilled to 6 milliKelvin or -273.144 degrees Celsius in preparation for a forthcoming experiment that will study neutrinos, ghostlike particles that could hold the key to the existence of matter around us.
silentpower-copper-foam. Ahh, the delightful non-sound of a passively-cooled PC. It's non-music to a geek's ears. Usually there's a performance tradeoff when a PC goes silent. That's not the case with Silent Power, a tiny ...
(Phys.org) —By looking at a piece of material in cross section, Washington University in St. Louis engineer Parag Banerjee, PhD, and his team discovered how copper sprouts grass-like nanowires that could one day be made into solar cells.
One of the fundamental challenges of battery technology is that lithium-ion batteries — by far the best general option for energy storage currently in wide commercial use — are intrinsically bulky and heavy. A new research team at the University of Central Florida believes they can challenge that problem by turning copper wires into supercapacitors, then embedding those wires into the fabric of your clothing or the body of a device. In theory, they could also be embedded throughout the body of a car, significantly boosting total energy storage and freeing up space in the trunk.
Increased portability, versatility and ubiquity of electronics devices are a result of their progressive miniaturization, requiring current flow through narrow channels. Present-day devices operate close to the maximum current-carrying-capacity (that is, ampacity) of conductors (such as copper and gold), leading to decreased lifetime and performance, creating demand for new conductors with higher ampacity. Ampacity represents the maximum current-carrying capacity of the object that depends both on the structure and material. Here we report a carbon nanotube–copper composite exhibiting similar conductivity (2.3–4.7 × 105Scm−1) as copper (5.8 × 105Scm−1), but with a 100-times higher ampacity (6 × 108Acm−2). Vacuum experiments demonstrate that carbon nanotubes suppress the primary failure pathways in copper as observed by the increased copper diffusion activation energy (~2.0eV) in carbon nanotube–copper composite, explaining its higher ampacity. This is the only material with both high conductivity and high ampacity, making it uniquely suited for applications in microscale electronics and inverters.
A transformer failure reported on Thursday at Copper Mountain Mining (TSE:CUM) will limit production to 24,000 tonnes per day for about the next four weeks.
The company says that one of the two ABB transformers powering the SAG mill motors failed. A transformer from a ball mill is being moved over to the SAG mill. The SAG mill is scheduled to be back in production by this Saturday.
"As part of the original design of the concentrator, the SAG mill and two ball mills have identical motors and transformers that are interchangeable in the event of a component failure."
IBM has made a stop-motion film -- A Boy and His Atom -- using individual molecules as pixels, in what Guinness has acknowledged is the world’s smallest movie.
IBM moved the molecules using two of its own scanning tunnelling microscopes. It's a huge machine that weighs two tonnes, operates at minus 268 degrees Celsius and magnifies atoms -- placed on a copper surface -- by 100 million times. The machine moved around 5,000 carbon monoxide molecules to create the movie. Each time the molecules were arranged in the right way, the IBM team rendered a still image to create each of the 242 frames. In those frames, you can only see one atom or pixel because you look at it from above. It took roughly 10 days of 18-hour shifts to get each frame right.
W/Cu graded materials are the leading candidate materials used as the plasma facing components in a fusion reactor. However, tungsten and copper can hardly be jointed together due to their great differences in physical properties such as coefficient of thermal expansion and melting point, and the lack of solid solubility between them. To overcome those difficulties, a new amorphous Fe–W alloy transitional coating and vacuum hot pressing (VHP) method were proposed and introduced in this paper. The morphology, composition and structure of the amorphous Fe–W alloy coating and the sintering interface of the specimens were analyzed by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The thermal shock resistance of the bonded composite was also tested. The results demonstrated that amorphous structure underwent change from amorphous to nano grains during joining process, and the joined W/Cu composite can endued plasma thermal shock resistance with energy density more than 5.33 MW/m2. It provides a new feasible technical to join refractory tungsten to immiscible copper with amorphous Fe–W alloy coating.
According to the company, the new FX100 Cube fanless cooler is compatible with a large majority of CPU sockets and features copper and aluminum heat pipes for natural heat dissipation. Users also have the option of installing a 92mm fan for additional cooling performance.
(Phys.org)—Copper is one of the world's most widely used metals. Now researchers at the University of Dundee have found that blackening copper using industry-standard lasers could make it even more adaptable and ...
Research by an international team led by SLAC and Stanford scientists has uncovered a new, unpredicted behavior in a copper oxide material that becomes superconducting – conducting electricity without any loss – at relatively high temperatures.
The telecommunications masters at Bell Labs have managed to deliver a world record connection speed of 10Gbps (10,000Mbps) over copper wires. Dubbed XG.fast, the new technology could be used to massively extend ...
So far electrical cables are used only to transmit electricity. However, nanotechnology scientist and professor Jayan Thomas and his Ph.D. student Zenan Yu have developed a way to both transmit and store electricity in a single lightweight copper wire.
Chances are that the touchscreen on your smartphone or tablet incorporates a coating of indium tin oxide, also known as ITO or tin-doped indium oxide. Although it's electrically conductive and optically transparent, it's also brittle and thus easily-shattered. Scientists at Ohio's University of Akron, however, are developing something that could ultimately replace the material. They've created an electrode coating that's not only as transparent and more conductive than ITO, but is also far tougher.
The coating, developed by a team led by assistant professor of polymer science Yu Zhu, is comprised of a network of linked copper nanowires. It can be deposited on either rigid glass or flexible clear polymer sheets.
In the early 1960s, a little less than a decade before the mission to the moon, the U.S. looked to space when planning an emergency communications system. At the time, the undersea telephone and telegraph cables were backed up only over-the-horizon radio, and both systems were vulnerable to attack or natural disaster. Today, Wired takes a look at a team of a team of MIT scientists who dreamed up a pretty far fetched but, they estimated, entirely feasible solution: Wrap thousands of miles of copper cable around the Earth to serve as a giant antenna. They called it Project West Ford.
“Karabashmed” is one of the oldest copper smelting plants of the South Ural located in the city of Karabash. The main activity of the plant is making blister copper from copper concentrate with a preliminary enrichment of copper-zinc ores and also from recycled copper raw material.
Wouldn't it be convenient if you could reverse the rusting of your car by shining a bright light on it? It turns out that this concept works for undoing oxidation on copper nanoparticles, and it could lead to an environmentally friendly production process for an important industrial chemical, University of Michigan engineers have discovered.
Copper theft in South Africa fell to its lowest level since April 2009 in January, indicating that the downward momentum seen in 2012 should continue into 2013, the South African Chamber of Commerce and Industry (Sacci) ...
Hans De Keulenaer's insight:
Apparently, the policies pursued in South Africa are effective.
The practical powder metallurgy processing steps on the copper-nickel-base alloys corroborate a first-rate mechanical strength and electrical conductivity values (Cu-Ni-Sn: 620Mpa, 40% IACS; Cu-Ni-Al: 400MPa, 35% IACS; Cu-Ni-Cr: 1000MPa; 79% IACS) that indicate a good quality application for these alloys utilizing powder metallurgy instead conventional metallurgy processing. Furthermore, the results for these alloys open the possibility to search and make fine grained homogeneous structures with interesting physical properties, also the capacity to produce parts with a superior surface finishing in different dimensions.
The direct reduction of CO2 to CH3OH is known to occur at several types of electrocatalysts including oxidized Cu electrodes. In this work, we examine the yield behavior of an electrodeposited cuprous oxide thin film and explore relationships between surface chemistry and reaction behavior relative to air-oxidized and anodized Cu electrodes. CH3OH yields (43 μmol cm−2 h−1) and Faradaic efficiencies (38%) observed at cuprous oxide electrodes were remarkably higher than air-oxidized or anodized Cu electrodes suggesting Cu(I) species may play a critical role in selectivity to CH3OH. Experimental results also show CH3OH yields are dynamic and the copper oxides are reduced to metallic Cu in a simultaneous process. Yield behavior is discussed in comparison with photoelectrochemical and hydrogenation reactions where the improved stability of Cu(I) species may allow continuous CH3OH generation.
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