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Colin Bennett

Superconducting fluctuations and the Nernst effect in high-Tc superconductors - 0 views

iopscience.iop.org/...105029

trends copper superconductors

shared by Colin Bennett on 13 Sep 13 - No Cached
  • The comprehensive ρ(T) measurements and the consequent resistivity curvature mapping (RCM) on Y0.7Ca0.3Ba2Cu3O7−δ thin films (doping levels p = 0.08–0.21) elucidate a phase diagram for the whole doping range. This phase diagram further strengthens a view that the 'normal' phase in hole-doped cuprates should be divided into a strong superconducting (SC) fluctuation phase and the 'real' normal phase in which there is no significant influence of SC. The temperature of superconducting fluctuations Tf as a function of p was calculated using the Ginzburg–Landau model for layered superconductors. Comparisons between Tf and the Nernst temperature establish the origin of the Nernst effect as SC fluctuations. Some of the details in ρ(T) cannot be fully understood by the existing models and call for a more sophisticated theory of carrier dynamics in cuprates.
Hans De Keulenaer

Strategies for reducing the carbon footprint of copper : New technologies, more recycli... - 0 views

cat.inist.fr/?aModele=afficheN&cpsidt=18946659

copper recycling footprint carbon

shared by Hans De Keulenaer on 08 Nov 08 - Cached
  • Existing approaches to reducing environmental impacts along the metal production and consumption chain are focused largely at the plant scale for primary production, rather than considering the whole metal cycle. As such, many opportunities for systemic improvements are overlooked. This paper develops an approach to designing preferred futures for entire metal cycles that deliver reduced carbon footprints. Dynamic material flow models in Visual Basic® are used to provide life-cycle-impact-assessment indicators, which help identify key intervention points along the metal cycle. This analysis also identifies which actors or agents along the value chain are responsible for, or can influence, behaviour which affects environmental performance. With this information, it is possible to evaluate different scenarios for transition paths to achieve reduced impact. These scenarios consider combinations of new technology, increased metal recycling and demand management strategies. A case study for the copper cycle in the USA shows that to meet a CO2 reduction target of 60% by 2050, innovative technologies for primary processing of mined ore will play a limited role, due to their increasing impacts in the future associated with mining ever lower ore grades. To compensate for this whilst meeting demand projections, recycling of old scrap would be required to increase from 18% to 80%, requiring extensive collaboration between primary and secondary producers. An alternate scenario which focuses on demand reduction for copper by 1% per year, meets the CO2 target whilst only requiring an increase in the recycling rate from 18% to 36%. Together, these suggest that there is merit in examining the 'metal-in-use' stage of the metal value chain more closely in order to achieve targeted reductions in CO2. The approach also highlights the inherent trade-offs between different aspects of environmental performance which are required when pursuing CO2 reduction targets.
Colin Bennett

Superconducting properties of the ternary transition-metal silicide Zr2Ru3Si4 - 0 views

iopscience.iop.org/...025012

trends copper superconductors

shared by Colin Bennett on 07 Jan 14 - No Cached
  • Superconducting properties of the polycrystalline Zr2Ru3Si4 were investigated by measuring the electrical resistivity, magnetization and specific heat.
Colin Bennett

Optimization of the copper addition to the core of in situ Cu-sheathed MgB2 wires - 0 views

iopscience.iop.org/...105008

trends copper superconductor

shared by Colin Bennett on 22 Aug 13 - No Cached
  • Recent results on powder-in-tube in situ Cu-sheathed MgB2 wires have shown that copper powder additions to the core can accelerate the formation of MgB2, increasing its volume fraction and greatly decreasing the amount of Mg–Cu intermetallic phases present in the core after heat treatment. The amount of added copper and heat treatment conditions strongly affect the critical current of the wire and require optimization.
Colin Bennett

Aluminium buckles under weight of supply pressure - 1 views

www.ft.com/...98-11e1-8ae6-00144feab49a.html

trends copper aluminum

shared by Colin Bennett on 10 Apr 12 - No Cached
  • Colin Bennett on 10 Apr 12
     
    Mr Kloppers can afford to dislike aluminium; the majority of his profits come from iron ore, oil and coal. But for the rest of the industry, his comments have sparked a debate: after a decade of sub-par profitability, is it still worth investing in aluminium?
James Wright

China - Official January Manufacturing PMI up to 50.5 from 50.3 in December - 0 views

www.cflp.org.cn/...177449.shtml

China end-use copper PMI

shared by James Wright on 02 Feb 12 - No Cached
  • James Wright on 02 Feb 12
     
    The Chinese government released its composite manufacturing PMI, which showed improved signs of broad industry growth in January, as the index rose to 50.5 from 50.3 in December. A figure above 50 indicates an expanding industry. The results also indicated variance between sub sectors. The new orders index was 50.6 up from 50.2 in December, however orders for intermediate goods manufacturing and the production of finished goods contracted. The manufacturing export sub sector PMI was down to 46.9 from 48.3 in December, which suggests an ongoing shift from exports to domestic demand. The contraction in exports included the intermediate goods manufacturing and the production of finished goods product sector. The Official China PMI in January is greater than the HSBC China Manufacturing PMI for the same month, which was 48.8. HSBC's PMI was up from 48.7 in December and suggests that the Chinese manufacturing industry is contracting. The HSBC PMI survey includes a greater proportion of smaller companies than the official survey.
Colin Bennett

Effect of graphene oxide doping on superconducting properties of bulk MgB2 - 0 views

iopscience.iop.org/...095008

trends copper superconductors graphene

shared by Colin Bennett on 30 Jul 13 - No Cached
  • Furthermore, a curious result of the present investigation is that there is no change in the superconducting transition temperature (Tc) up to a doping level of 10 wt%.
Colin Bennett

Superconductivity and the environment: a Roadmap - 0 views

iopscience.iop.org/...113001

trends copper superconductors

shared by Colin Bennett on 15 Oct 13 - No Cached
  • Energy. The Equinox Summit held in Waterloo Canada 2011 (2011 Equinox Summit: Energy 2030 http://wgsi.org/publications-resources) identified electricity use as humanity's largest contributor to greenhouse gas emissions. Our appetite for electricity is growing faster than for any other form of energy. The communiqué from the summit said 'Transforming the ways we generate, distribute and store electricity is among the most pressing challenges facing society today.... If we want to stabilize CO2 levels in our atmosphere at 550 parts per million, all of that growth needs to be met by non-carbon forms of energy' (2011 Equinox Summit: Energy 2030 http://wgsi.org/publications-resources). Superconducting technologies can provide the energy efficiencies to achieve, in the European Union alone, 33–65% of the required reduction in greenhouse gas emissions according to the Kyoto Protocol (Hartikainen et al 2003 Supercond. Sci. Technol.16 963). New technologies would include superconducting energy storage systems to effectively store power generation from renewable sources as well as high-temperature superconducting systems used in generators, transformers and synchronous motors in power stations and heavy-industry facilities. However, to be effective, these systems must be superior to conventional systems and, in reality, market penetration will occur as existing electrical machinery is written off. At current write-off rates, to achieve a 50% transfer to superconducting systems will take 20 years (Hartikainen et al 2003 Supercond. Sci. Technol.16 963).
Colin Bennett

High-performance MgB2 superconducting wires for use under liquid-helium-free conditions... - 0 views

iopscience.iop.org/...125003

trends copper superconductors

shared by Colin Bennett on 18 Oct 13 - No Cached
  • Thus, it is hoped that MgB2 can not only replace metallic superconductors, but can be used under liquid-helium-free conditions, for example, at temperatures of 10–20 K that can easily be achieved using cryocooling systems.
Colin Bennett

China National Bureau of Statistics - Power Transmission, Distribution, Control Equipme... - 0 views

www.researchinchina.com/...5931.html

trends copper ultra high voltage

shared by Colin Bennett on 06 Aug 10 - Cached
  • Promoted by key projects including large-scale long-distance power transmission, ultra-high voltage grid construction, power grid construction in new rural areas and railway electrification reconstruction, the power transmission and distribution and control equipment industry of China achieved rapid development in 2009, with the annual sales revenue and total profit of RMB 656.19 billion and RMB 49.13 billion, a YoY rise of 15.7% and 19.5% respectively. Boosted by the fast growth of power transmission & distribution and control equipment industry, five sub-sectors mounted up vigorously in 2009. In particular, capacitor and corollary equipment sub-sectors showed the most rapid growth, with the prime operating revenue and total profit increasing by 28.3% and 63.3% respectively from a year earlier. This can be ascribed to the following three factors: firstly, China has made much progress in the development of ultra-high voltage and extra-high voltage technologies; secondly, it is the period from 2009 to 2010 that the ultra-high voltage demonstration projects in China have been constructed in succession, characterizing huge investment; thirdly, China has actively promoted the concept of energy conservation and emission reduction and paid increasing attention to voltage quality, safety and electricity saving, etc.
xxx xxx

Ridgeway Gold and Copper Mine Cadia Valley, New South Wales Mining Technology - 0 views

www.mining-technology.com/...cadiavalley

mining

shared by xxx xxx on 28 Aug 08 - Cached
  • xxx xxx on 28 Aug 08
     
    The Ridgeway underground mine cave is located in the mineral-rich Cadia Valley province in central New South Wales. A gold and copper mine, it is 100% owned by Australia's Newcrest Mining, and is one of three operations owned by the company in the province. The others are Cadia East and Cadia Hill, the largest of the three. "The Ridgeway underground mine cave is located in the mineral-rich Cadia Valley province."Ridgeway is in the process of transitioning from the sub-level cave to a block cave beneath the existing mine. In 2007 the Newcrest board approved development of the Ridgeway Deeps block cave. It will be the first natural caving operation to be developed by Newcrest and will be the deepest block cave in Australia. The company says it is spending A$525m to develop it. The mineral resource at Ridgeway Deeps was re-estimated following a geological reinterpretation which yielded an increased resource of 20 million tons containing 0.5 million ounces of gold, and 0.05 million tons of copper. GEOLOGY AND RESERVES
Sergio Ferreira

Commission pushes ICT use for Energy Efficiency - 0 views

europa.eu/...pressReleasesAction.do

ICT energy efficiency

shared by Sergio Ferreira on 12 Mar 09 - Cached
  • These technologies are expected to reduce total carbon emissions in Europe by up to 15% by 2020. ICT can not only improve monitoring and management of energy use in factories, offices and in public spaces but above all help make people more aware of how they use energy.
  • The ICT sector itself is responsible for 2% of carbon emissions in Europe: 1.75% resulting from the use of ICT products and services, and 0.25% from their production
  • Results from trials in a number of Member States show that using smart meters can lower energy consumption by up to 10%
  • ...3 more annotations...
  • It will also call on the ICT sector to lead the way by setting itself concrete targets to become more energy efficien
  • The Commission also announced a new public consultation to establish a common base for commitments to and claims of improved energy efficiency.
  • Voluntary ICT Sector commitments to targets and deadlines for CO2 and Greenhouse Gas emissions (GHG), and energy efficiency/consumption
Colin Bennett

Micro-manufacturing Now Offers Advantages For Specialist Processes - 0 views

www.engineerlive.com/...21548

trends copper nanotechnology manufacturing

shared by Colin Bennett on 31 Mar 09 - Cached
  • Colin Bennett on 31 Mar 09
     
    Miniaturisation is not new, but manufacturing mechanical, electromechanical and fluidic components on a micro scale is rapidly developing into a recognisable industry in itself. Alistair Rae reports on a selection of the latest developments in this exciting field. Over the past few years a new industry has developed to serve the growing demand for micro-manufacturing. While miniaturisation has been ongoing since the commercialisation of the transistor some 50 years ago, it is only recently that it has been viable to manufacture high volumes of mechanical and electromechanical components with features in the sub-millimetre range.
Colin Bennett

Groove-rolling as an alternative process to fabricate Bi-2212 wires for pract... - 1 views

iopscience.iop.org/...055022

trends copper magnetic fabrication

shared by Colin Bennett on 28 Mar 14 - No Cached
  • In this paper we demonstrate the ability of this technique to increase the density in Bi-2212 wires, which leads to a three-fold increase in JC with respect to drawn wires, making this approach very promising for fabricating Bi-2212 wires for high magnetic field magnets, i.e. above 25 T.
Colin Bennett

Africa Electricity Metering Market Value To Grow 234% Over Next Decade - 1 views

tdworld.com/...alue-grow-234-over-next-decade

trends copper Sub Saharan Africa meters

shared by Colin Bennett on 08 May 14 - No Cached
  • Sub-Saharan Africa's electricity metering market will see the fastest growth of any region in the world over the next decade.
Colin Bennett

The growing case for graphene being bumped off its pedestal - 0 views

www.materialstoday.com/...e-transfer-in-photoexcited-mx2

trends copper graphene MX2

shared by Colin Bennett on 29 Aug 14 - No Cached
  • A new argument has just been added to the growing case for graphene being bumped off its pedestal as the next big thing in the high-tech world by the two-dimensional semiconductors known as MX2 materials.
Colin Bennett

$180bn investment for Africa infrastructure through 2025 - 0 views

www.mining.com/rastructure-through-2025-96008

trends copper Africa transmission distribution utility infrastructure

shared by Colin Bennett on 08 Aug 14 - No Cached
  • The greatest growth of spending for utilities is expected in sub-Saharan Africa where an annual rate of 10.4% between now and 2025 is forecasted. Spending for electricity production and distribution is expected to rise from $15 billion in 2012 to $55 billion, while expenditures for improvements in water and sanitation services are forecasted to increase from $3.3 billion in 2012 to about $10 billion by 2025. A substantial increase in spending in the basic manufacturing sector is expected in sub-Saharan Africa. Annual spending in the chemical, metals and fuels sector is forecasted to increase across the seven major African economies to $16 billion, up from about $6 billion in 2012.
Colin Bennett

Automotive wire substitution - 1 views

www.te.com/...automotive.html

trends copper automotive substitution

shared by Colin Bennett on 31 Jul 14 - No Cached
  • Changing copper to aluminum wire in motor vehicles effectively reduces vehicle weight for  greater fuel efficiency and lower CO2 emissions. TE’s LITEALUM
Colin Bennett

Africa left behind - 2 views

www.economist.com/...rty-moving-cities-why-does-not

trends copper urbanization Africa

shared by Colin Bennett on 20 Sep 16 - No Cached
  • Colin Bennett on 20 Sep 16
     
    Africa is the world's fastest urbanising continent. In 1950, sub-Saharan Africa had no cities with populations of more than 1m. Today, it has around 50. By 2030, over half of the continent's population will live in cities, up from around a third now. The fastest growing metropolises, such as Nairobi, Kenya's capital, are expanding at rates of more than 4% per year. That is almost twice as fast as Houston, America's fastest-growing metropolis.
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