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Carbon nanotube springs are springs made of carbon nanotubes (CNTs). They are an alternate form of high density, lightweight, reversible energy storage based on the elastic deformations of CNTs. Many previous studies on the mechanical properties of CNTs have revealed that they possess high stiffness, strength and flexibility. The Young's modulus of CNTs is 1 TPa and they have the ability to sustain reversible tensile strains of 6%^[1] and the mechanical springs based on these structures are likely to surpass the current energy storage capabilities of existing steel springs and provide a viable alternative to electrochemical batteries. The obtainable energy density is predicted to be highest under tensile loading, with an energy density in the springs themselves about 2500 times greater than the energy density that can be reached in steel springs, and 10 times greater than the energy density of lithium-ion batteries.

The process of elastic energy storage in a CNT involves in deforming it under an applied load. On removal of the applied load the energy released from the CNT can be used to perform mechanical work. A CNT has the ability to deform reversibly and a spring made from it can undergo repeated charge-discharge cycles without fatigue.

A CNT spring can store elastic strain energy with a density several orders of magnitude higher than conventional springs made of steel. Strain energy density in a material is proportional to the product of its Young's modulus and the square of the applied strain.

When multi-walled nanotubes (MWCNTs) are loaded, the majority of the applied load is borne by the outer shell. Owing to this limited load transfer between the different layers of MWCNTs, single walled nanotubes (SWCNTs) are more useful structural materials for springs.

Energy storage in CNT springs

Springs for energy storage can be made of SWCNTs or MWCNTs arranged in dense bundles of long, aligned tubes called 'forests' of CNTs ^[2] that are grown by chemical vapor deposition (CVD). The 'forests' can grow to heights of up to 6mm.^[3] A deformed CNT requires a support structure to carry the load of the spring prior to discharge. A mechanical spring must be coupled to external mechanisms to build a power source that is functionally useful. On its own a spring stores potential energy when an external force is applied to it but releases the energy in a single rapid burst once the force is removed. An effective power source needs to store energy over a period of time, release the energy only when needed and discharge the energy at a desired power level. A CNT based portable power source should have a basic architecture made of four main components: a CNT spring, a supporting structure for the spring, a generator-motor combination, and a coupling mechanism between the spring and the generator.

For CNTs arranged in groups/bundles called 'forests' as described earlier, efficient packing and good alignment in necessary between the tubes to achieve a high energy density. Good load transfer and effective attachment techniques are required so that the shells can be loaded to near their elastic limit.

Choosing the appropriate deformation mode consisting of any amongst axial tension, axial compression, torsion or bending or a combination of any of them. A criterion for choosing a deformation mode is not only the highest energy density but also the proper integration of the deformed spring with the rest of the power dissipation mechanism.

A support structure is required to hold the CNT spring in the fully loaded configuration prior to its release . The design of the support structure will depend on the scale of the spring, the deformation mode the CNT is being subjected to and the architecture of the rest of the system. The material selected for the structure should have high strength because the added mass and volume of the support contribute to reducing the energy density of the entire system.

Energy storage calculations

Axial tension

Analysis is performed on CNTs subject to tensile loads. A hollow cylindrical structure of CNT of length L, diameter d and mean radius r is considered. The tube has thickness n.h, where n is the number of layers in the CNT and h=0.34 nm is the thickness of one shell. The Young's modulus of the material of the CNT is E. In case of SWCNTs, n=1 and n>1 in case of MWCNTs. The cylinder has inner and outer radii of

$r_{i} = r - \frac{n h}{2}$

and

$r_{o} = r + \frac{n h}{2}$ .

The shell's cross-sectional area is

$A = π (r_{o}^{2} - r_{i}^{2})$

and the total enclosed area is

$A_{t} = π r_{o}^{2}$ .

The strain energy that can be stored in the bar under axial compression to a strain of $ϵ$ is

$U = \frac{1}{2} ∭ (σ_{x} ϵ_{x}$ ) $d x d y d z = \frac{1}{2} E ϵ^{2} A L$ = $\frac{1}{2} E ϵ^{2} π (r_{o}^{2} - r_{i}^{2}) L$

The strain energy density is simply the ratio of the strain energy and the enclosed volume. Therefore in order for the strain energy density to be high the value of $A / A_{t}$ should be large. So, a spring in axial tension should consist of either SWCNTs with small diameters or uniformly loaded MWCNTs with densely packed shells to maximize $A / A_{t}$ .

The CNTs are arranged in groupings, generally bundles. The strain energy density must be reduced by a fill factor k to account for the spacing between the individual CNTs.

Consider the cross-section of a bundle of closely packed SWCNTs of radius r, arranged into a two-dimensional triangular lattice with a lattice constant of 2r+h. Ideal packing is assumed with a spacing of h=0.34 nm which is taken equal to the graphitic spacing. When the CNTs are arranged in a bundle the best packing fraction is produced when they are packed in a hexagonal closed packed structure.

Consider a cross section of one bundle. A hexagonal shape will be observed. The hexagonal shape with an area of $A_{h}$ is taken to be the repeating geometrical unit in the bundle. Calculations can be performed to show that fill factor k = 91%. In reality, there may not be ideal packing within a bundle, as the actual fraction k may be lower than the value calculated.

The expression of strain energy shows that it is advantageous to apply a high tensile strain to the springs to maximize energy storage since strain energy is proportional to square of the strain.

Axial compression

Analysis is performed on CNTs subject to compressive loads. The CNT is assumed to be a hollow cylindrical beam of length L, Young's modulus E, and thickness n.h, where n is the number of layers and h=0.34 nm is the thickness of one shell(taken equal to the separation between graphene sheets in graphite). The continuous tube has a mean radius r and diameter d. The cylinder has inner and outer radii of

$r_{i} = r - \frac{n h}{2}$

and

$r_{o} = r + \frac{n h}{2}$ .

The shell's cross-sectional area is

$A = π (r_{o}^{2} - r_{i}^{2})$

and the total enclosed area is

$A_{t} = π r_{o}^{2}$ .

The strain energy that can be stored in the bar under axial compression to a strain of $ϵ$ is

$U = \frac{1}{2} ∭ (σ_{x} ϵ_{x}$ ) $d x d y d z = \frac{1}{2} E ϵ^{2} A L$ = $\frac{1}{2} E ϵ^{2} π (r_{o}^{2} - r_{i}^{2}) L$

The strain energy density is just the strain energy divided by the enclosed volume. High energy densities are achieved with a high $A / A_{t}$ ratio. Therefore in order for CNT springs to achieve a high energy density either SWCNTs with small diameters or MWCNTs with densely packed shells should be used.

The Support structure

The purpose of using a support structure is to be able to store energy before it is released for use. The support structure should be strong enough to support the applied load (used to compress the CNTs) without reaching failure itself. Another point of consideration is that the energy density of the combined spring and supporting structure is always lower than the energy density of the spring alone.

Energy density comparison

A CNT spring made of bundles of densely packed 1 nm diameter SWCNTs stretched to a 10% strain is predicted to have an energy density of 3.4Template:E kJ/m³. The energy density of CNT springs loaded in tension is higher than the energy density of CNT springs loaded in compression.^[4] Whereas the current maximum energy density of a carbon-steel watch spring is reported to be between 1080 kJ/m³^[5] and 3000 kJ/m³.^[6] Calculations show that when a support structure made of single crystal silicon carbide is used the energy density of CNT springs reduces to 1Template:E kJ/m³. Even after considering a support structure and other energy extraction hardware associated with a CNT spring energy harvesting device, its energy density is much greater than mechanical springs and is in approximately the same range as that of lithium-ion batteries. The energy density is much lower than the energy density of any hydrocarbon used in combustion processes.

Failure processes that limit energy storage

A large number of CNTs are needed to store a significant amount of energy that can be used for macroscopic processes. In order to achieve such a large amount of energy storage the CNT springs must maintain high stiffness and elasticity. It is in practice quite difficult to have such high stiffness and elastic strains in yarns or fibers made up of assemblies of CNTs as they seldom maintain mechanical properties of an individual SWCNT. This behavior occurs due to atomic defects and imperfect organisation.

Elastic loading is the preferred loading mechanism for reversible energy storage, experiments have been performed that indicate that loading within the fibers deviates from purely elastic behavior.

Only a portion of the CNTs contribute to the load bearing at a given strain. The unequal amount of slack within each CNT due to the presence of atomic defects and tangling causes different CNTs to fracture at different strains.

When MWCNTs are loaded in tension it is difficult to grasp their inner shells. Tensile tests of MWCNTs attached to atomic force microscope (AFM) tips at both ends show that fracture occurs at the outer shell in a way such that majority loading occurs at the outer shell and little load transfer occurs to the inner shells. This causes the stiffness and strength of MWCNTs to be lower than they would be if the shells were loaded equally.

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

http://memagazine.asme.org/Articles/2010/march/Carbon_SuperSpring.cfm

↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
↑ Hill, F.A. Energy Storage in Carbon Nanotube Super-Springs, MIT Thesis (2008)
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[1] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[2] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[3] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[th-4] Hill, F.A. Energy Storage in Carbon Nanotube Super-Springs, MIT Thesis (2008)

[5] 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

[6] Advertised specifications for A. Lange & Soehne's 31-day watch. alangesoehne.com

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+'''Carbon nanotube springs''' are springs made of [[carbon nanotube]]s (CNTs). They are an alternate form of high density, lightweight, reversible  energy storage based on the elastic deformations of CNTs. Many previous studies on the mechanical properties of CNTs have revealed that they possess high stiffness, strength and flexibility. The [[Young's modulus]] of CNTs is 1 TPa and they have the ability to sustain reversible tensile strains of 6%<ref>{{cite journal|title=Elastic strain of freely suspended single-wall carbon nanotube ropes|journal= Applied Physics Letters|volume=74|pages=3803–3805|year=1992|url=http://cohesion.rice.edu/naturalsciences/smalley/emplibrary/apl74-3803.pdf|doi=10.1063/1.124185|bibcode=1999ApPhL..74.3803W|last1=Walters|first1=D. A.|last2=Ericson|first2=L. M.|last3=Casavant|first3=M. J.|last4=Liu|first4=J.|last5=Colbert|first5=D. T.|last6=Smith|first6=K. A.|last7=Smalley|first7=R. E.|issue=25}}</ref> and the mechanical springs based on these structures are likely to surpass the current energy storage capabilities of existing steel springs and provide a viable alternative to electrochemical batteries. The obtainable energy density is predicted to be highest under tensile loading, with an energy density in the springs themselves about 2500 times greater than the energy density that can be reached in steel springs, and 10 times greater than the energy density of lithium-ion batteries.
+The process of elastic energy storage in a CNT involves in deforming it under an applied load. On removal of the applied load the energy released from the CNT can be used to perform mechanical work. A CNT has the ability to deform reversibly and a spring made from it can undergo repeated charge-discharge cycles without fatigue.
+A CNT spring can store elastic strain energy with a density several orders of magnitude higher than conventional springs made of steel. Strain energy density in a material is proportional to the product of its [[Young's modulus]] and the square of the applied strain.
+When [[Carbon_nanotube#Multi-walled|multi-walled nanotubes]] (MWCNTs) are loaded, the majority of the applied load is borne by the outer shell. Owing to this limited load transfer between the different layers of MWCNTs, [[single walled nanotube]]s (SWCNTs) are more useful structural materials for springs.
+==Energy storage in CNT springs==
+Springs for energy storage can be made of SWCNTs or MWCNTs arranged in dense bundles of long, aligned tubes called 'forests' of CNTs <ref>{{cite journal|title=Storing elastic energy in carbon nanotubes|url=http://www-personal.umich.edu/~ajohnh/mechanosyn/publications/files/032_hill_09_tensile.pdf|doi=10.1088/0960-1317/19/9/094015|journal= Micromechanics and Microengineering|volume=20|pages=104012–104019|year=2010|last1=Hill|first1=F A|last2=Havel|first2=T F|last3=Hart|first3=A J|last4=Livermore|first4=C|issue=9|bibcode = 2009JMiMi..19i4015H }}</ref> that are grown by [[chemical vapor deposition]] (CVD). The 'forests' can grow to heights of up to 6mm.<ref>{{cite journal|title=Characterizing the failure processes that limit the storage of energy in carbon nanotube springs under tension|url=http://www-personal.umich.edu/~ajohnh/mechanosyn/publications/files/046_hill_10_springs2.pdf|doi=10.1088/0960-1317/20/10/104012|journal= Micromechanics and Microengineering|volume=19|pages=94015–94020|year=2009|last1=Hill|first1=F A|last2=Havel|first2=T F|last3=Hart|first3=A J|last4=Livermore|first4=C|issue=10|bibcode = 2010JMiMi..20j4012H }}</ref> A deformed CNT requires a support structure to carry the load of the spring prior to discharge. A mechanical spring must be coupled to external mechanisms to build a power source that is functionally useful. On its own a spring stores potential energy when an external force is applied to it but releases the energy in a single rapid burst once the force is removed. An effective power source needs to store energy over a period of time, release the energy only when needed and discharge the energy at a desired power level. A CNT based portable power source should have a basic architecture made of four main components: a CNT spring, a supporting structure for the spring, a generator-motor combination, and a coupling mechanism between the spring and the generator.
+For CNTs arranged in groups/bundles called 'forests' as described earlier, efficient packing and good alignment in necessary between the tubes to achieve a high energy density. Good load transfer and effective attachment techniques are required so that the shells can be loaded to near their elastic limit.
+Choosing the appropriate deformation mode consisting of any amongst axial tension, axial compression, torsion or bending or a combination of any of them. A criterion for choosing a deformation mode is not only the highest energy density but also the proper integration of the deformed spring with the rest of the power dissipation mechanism.
+A support structure is required to hold the CNT spring in the fully loaded configuration prior to its release . The design of the support structure will depend on the scale of the spring, the deformation mode the CNT is being subjected to and the architecture of the rest of the system. The material selected for the structure should have high strength because the added mass and volume of the support contribute to reducing the energy density of the entire system.
+==Energy storage calculations==
+===Axial tension===
+Analysis is performed on CNTs subject to tensile loads. A hollow cylindrical structure of CNT of length L, diameter d and mean radius r is considered. The tube has thickness n.h, where n is the number of layers in the CNT and h=0.34&nbsp;nm is the thickness of one shell. The [[Young's modulus]] of the material of the CNT is E. In case of SWCNTs, n=1 and n>1 in case of MWCNTs. The cylinder has inner and outer radii of
+<math> r_i = r - \frac{nh}{2}</math>
+and
+<math> r_o = r + \frac{nh}{2}</math>.
+The shell's cross-sectional area is
+<math> A = \pi(r_o^2 - r_i^2) </math>
+and the total enclosed area is
+<math> A_t = \pi r_o^2 </math>.
+The strain energy that can be stored in the bar under axial compression to a strain of <math>\epsilon\,</math> is
+<math>U =\frac{1}{2} \iiint (\sigma_x\,\epsilon_x\,</math>)<math>\, dx\, dy\, dz =\frac{1}{2}E\epsilon^2\ AL </math> = <math>\frac{1}{2}E\epsilon^2\pi (r_o^2 - r_i^2) L </math>
+The strain energy density is simply the ratio of the strain energy and the enclosed volume. Therefore in order for the strain energy density to be high the value of <math>A/A_t</math> should be large. So, a spring in axial tension should consist of either SWCNTs with small diameters or uniformly loaded MWCNTs with densely packed shells to maximize <math>A/A_t</math>.
+The CNTs are arranged in groupings, generally bundles. The strain energy density must be reduced by a fill factor k to account for the spacing between the individual CNTs.
+Consider the cross-section of a bundle of closely packed SWCNTs of radius r, arranged into a two-dimensional triangular lattice with a lattice constant of 2r+h. Ideal packing is assumed with a spacing of h=0.34&nbsp;nm which is taken equal to the graphitic spacing. When the CNTs are arranged in a bundle the best packing fraction is produced when they are packed in a hexagonal closed packed structure.
+Consider a cross section of one bundle. A hexagonal shape will be observed. The hexagonal shape with an area of <math> A_h</math> is taken to be the repeating geometrical unit in the bundle. Calculations can be performed to show that fill factor k = 91%. In reality, there may not be ideal packing within a bundle, as the actual fraction k may be lower than the value calculated.
+The expression of strain energy shows that it is advantageous to apply a high tensile strain to the springs to maximize energy storage since strain energy is proportional to square of the strain.
+===Axial compression===
+Analysis is performed on CNTs subject to compressive loads. The CNT is assumed to be a hollow cylindrical beam of length L, [[Young's modulus]] E, and thickness n.h, where n is the number of layers and h=0.34&nbsp;nm is the thickness of one shell(taken equal to the separation between [[graphene]] sheets in [[graphite]]). The continuous tube has a mean radius r and diameter d. The cylinder has inner and outer radii of
+<math> r_i = r - \frac{nh}{2}</math>
+and
+<math> r_o = r + \frac{nh}{2}</math>.
+The shell's cross-sectional area is
+<math> A = \pi(r_o^2 - r_i^2) </math>
+and the total enclosed area is
+<math> A_t = \pi r_o^2 </math>.
+The strain energy that can be stored in the bar under axial compression to a strain of <math>\epsilon\,</math> is
+<math>U =\frac{1}{2} \iiint (\sigma_x\,\epsilon_x\,</math>)<math>\, dx\, dy\, dz =\frac{1}{2}E\epsilon^2\ AL </math> = <math>\frac{1}{2}E\epsilon^2\pi (r_o^2 - r_i^2) L </math>
+The strain energy density is just the strain energy divided by the enclosed volume.
+High energy densities are achieved with a high <math>A/A_t</math> ratio. Therefore in order for CNT springs to achieve a high energy density either SWCNTs with small diameters or MWCNTs with densely packed shells should be used.
+==The Support structure==
+The purpose of using a support structure is to be able to store energy before it is released for use. The support structure should be strong enough to support the applied load (used to compress the CNTs) without reaching failure itself. Another point of consideration is that the energy density of the combined spring and supporting structure is always lower than the energy density of the spring alone.
+==Energy density comparison==
+A CNT spring made of bundles of densely packed 1&nbsp;nm diameter SWCNTs stretched to a 10% strain is predicted to have an energy density of 3.4{{e|6}} kJ/m<sup>3</sup>. The energy density of CNT springs loaded in tension is higher than the energy density of CNT springs loaded in compression.<ref name=th>Hill, F.A. [http://dspace.mit.edu/handle/1721.1/44887 ''Energy Storage in Carbon Nanotube Super-Springs''], MIT Thesis (2008)</ref> Whereas the current maximum energy density of a carbon-steel watch spring is reported to be between 1080 kJ/m<sup>3</sup><ref>{{cite book|last=Madou|first=M.|title=Fundamentals of Microfabrication|year=2002|publisher=CRC Press|isbn=0-8493-0826-7}}</ref> and 3000 kJ/m<sup>3</sup>.<ref>[http://www.alangesoehne.com/en/watches/lange_31_movement.php?ID=cc332d1a2ea3b999fd38407 Advertised specifications for A. Lange & Soehne's 31-day watch]. alangesoehne.com</ref> Calculations show that when a support structure made of single crystal silicon carbide is used the energy density of CNT springs reduces to 1{{e|6}} kJ/m<sup>3</sup>. Even after considering a support structure and other energy extraction hardware associated with a CNT spring energy harvesting device, its energy density is much greater than mechanical springs and is in approximately the same range as that of lithium-ion batteries. The energy density is much lower than the energy density of any hydrocarbon used in combustion processes.
+==Failure processes that limit energy storage==
+A large number of CNTs are needed to store a significant amount of energy that can be used for macroscopic processes. In order to achieve such a large amount of energy storage the CNT springs must maintain high stiffness and elasticity. It is in practice quite difficult to have such high stiffness and elastic strains in yarns or fibers made up of assemblies of CNTs as they seldom maintain mechanical properties of an individual SWCNT. This behavior occurs due to atomic defects and imperfect organisation.
+Elastic loading is the preferred loading mechanism for reversible energy storage, experiments have been performed that indicate that loading within the fibers deviates from purely elastic behavior.
+Only a portion of the CNTs contribute to the load bearing at a given strain. The unequal amount of slack within each CNT due to the presence of atomic defects and tangling causes different CNTs to fracture at different strains.
+When MWCNTs are loaded in tension it is difficult to grasp their inner shells. Tensile tests of MWCNTs attached to [[atomic force microscope]] (AFM) tips at both ends show that fracture occurs at the outer shell in a way such that majority loading occurs at the outer shell and little load transfer occurs to the inner shells. This causes the stiffness and strength of MWCNTs to be lower than they would be if the shells were loaded equally.
+== References ==
+<!--- See [[Wikipedia:Footnotes]] on how to create references using <ref></ref> tags which then appear here automatically -->
+{{Reflist}}
+==External links==
+*http://memagazine.asme.org/Articles/2010/march/Carbon_SuperSpring.cfm
+{{DEFAULTSORT:Carbon Nanotube Springs}}
+[[Category:Energy storage| ]]
+[[Category:Articles created via the Article Wizard]]

Second-order co-occurrence pointwise mutual information: Difference between revisions

en>DoctorKubla

Revision as of 10:38, 20 October 2012

Contents

Energy storage in CNT springs

Energy storage calculations

Axial tension

Axial compression

The Support structure

Energy density comparison

Failure processes that limit energy storage

References

External links

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Second-order co-occurrence pointwise mutual information: Difference between revisions

en>DoctorKubla

Revision as of 10:38, 20 October 2012

Energy storage in CNT springs

Energy storage calculations

Axial tension

Axial compression

The Support structure

Energy density comparison

Failure processes that limit energy storage

References

External links

Navigation menu

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