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July 29th, 2010

Halting the Ocean Conveyor Belt Theory

For decades scientists have believed that Earth’s ocean currents worked like a giant conveyor belt, continuously transporting cold waters towards the equator and warmer waters towards the poles. This generally held model was driven by changes in temperature and salinity of the surface waters at high latitudes.
But in a paper in the June 18 issue of the journal Science Duke University oceanographer Susan Lozier, professor of physical oceanography and chair of the Division of Earth and Ocean Sciences at Duke University’s Nicholas School of the Environment, has suggested that it is time to rethink the conveyor belt model.
“The old model is no longer valid for the ocean’s overturning, not because it’s a gross simplification, but because it ignores crucial elements such as eddies and the wind field,” she says. “The concept of a conveyor belt for the overturning was developed decades ago, before oceanographers had measured the eddy field of the ocean and before they understood how energy from the wind impacts the overturning.”
“It is important to understand that there is clear and convincing evidence that the ocean waters overturn and that this overturning impact’s the Earth’s climate,” she adds. “Recent studies, however, have cast doubt on our ability to describe this overturning as a conveyor belt. From these studies we now understand that the overturning waters are not restricted to narrow boundary currents, that the overturning may vary from one ocean basin to the next and that the winds may create variability in the amount of water that overturns and in the pathways for the upper and lower limbs of the overturning.”
Lozier’s article in Science also looks at what we still do not know about the ocean’s overturning and how the overturning might change. Lozier will be leading a new international research program aiming to address the question of climate effects.
“Basically, our ability to refine our understanding of the ocean’s overturning stems in large part from our ever increasing ability to measure the ocean at finer and finer scales and at depths previously unmeasured,” she says. “Because the ocean waters are corrosive, at high pressure and generally inaccessible, the ocean has historically been a sparsely observed system. Recent technological advances are rapidly expanding the ocean’s observational database and with it, our understanding of ocean circulation.”

For decades scientists have believed that Earth’s ocean currents worked like a giant conveyor belt, continuously transporting cold waters towards the equator and warmer waters towards the poles. This generally held model was driven by changes in temperature and salinity of the surface waters at high latitudes.

But in a paper in the June 18 issue of the journal Science Duke University oceanographer Susan Lozier, professor of physical oceanography and chair of the Division of Earth and Ocean Sciences at Duke University’s Nicholas School of the Environment, has suggested that it is time to rethink the conveyor belt model.

“The old model is no longer valid for the ocean’s overturning, not because it’s a gross simplification, but because it ignores crucial elements such as eddies and the wind field,” she says. “The concept of a conveyor belt for the overturning was developed decades ago, before oceanographers had measured the eddy field of the ocean and before they understood how energy from the wind impacts the overturning.”

“It is important to understand that there is clear and convincing evidence that the ocean waters overturn and that this overturning impact’s the Earth’s climate,” she adds. “Recent studies, however, have cast doubt on our ability to describe this overturning as a conveyor belt. From these studies we now understand that the overturning waters are not restricted to narrow boundary currents, that the overturning may vary from one ocean basin to the next and that the winds may create variability in the amount of water that overturns and in the pathways for the upper and lower limbs of the overturning.”

Lozier’s article in Science also looks at what we still do not know about the ocean’s overturning and how the overturning might change. Lozier will be leading a new international research program aiming to address the question of climate effects.

“Basically, our ability to refine our understanding of the ocean’s overturning stems in large part from our ever increasing ability to measure the ocean at finer and finer scales and at depths previously unmeasured,” she says. “Because the ocean waters are corrosive, at high pressure and generally inaccessible, the ocean has historically been a sparsely observed system. Recent technological advances are rapidly expanding the ocean’s observational database and with it, our understanding of ocean circulation.”

Tag:Oil Resistant Conveyor Belt,Nylon Conveyor Belt

By admin • Posted in Conveyor Belts • Comments Off
July 22nd, 2010

The distinction between the types of conveyor belt and Recognition

The distinction between the types of conveyor belt and Recognition
Called the transport conveyor belt, conveyor belt for carrying and transportation of materials play the role of the rubber and fiber, metal composite products, plastics and fabrics or composite products. Belt conveyor in the agricultural, industrial and mining enterprises and transportation in a variety of widely used to transport solid bulk and powder-like material or into items, conveyor belts can be continuous, high efficiency, large angle transport, conveyor belt safe operation, conveyor belt is easy to use, easy maintenance, low shipping costs, and shorten the transport distance, reducing construction costs, save manpower and resources
Many types of conveyor belt, in accordance with the use classification are: general purpose conveyor belts, flame-retardant anti-static conveyor belt, Rubber Conveyor Belt, heat-resistant conveyor belt, heat resistant conveyor belt, acid and alkali conveyor belt, oil resistant conveyor belt, cold resistant conveyor belt and so on.
Classified according to structural materials are: ordinary cotton canvas belt, nylon conveyor belt, polyester belt, steel cord conveyor belt, PVC solid woven conveyor belt, PVG solid woven conveyor belt, steel cable conveyor belt and so on.
Structure by product category are: layered belt, the whole conveyor belt, steel cord conveyor belt, steel cable conveyor belt, pipe conveyor, pattern conveyor belt, sidewall conveyor belt, conveyor belt, etc. by layer.
For convenience, we generally use a unified representation to represent a variety of conveyor belt, various types of conveyor belt that way
1, hierarchical representation of belt used (the standard representation of different, specific requirements, please refer to the standard GB7984): to NN200 1000 × 6 (6 +3) as an example, NN200 that is nylon 200, 1000 – The width of said tape, 6 -, said nylon layers, (6 +3) – that cover the upper and lower rubber conveyor belt were 6 mm and 3 mm thick.
2, said steel cord conveyor belt used Method: ST1000 H 1000? 4.0-6.0-6.0 example: ST1000-that is the strength specifications for 1000N/mm H-that is the level of performance rubber cover 1000 – that the products Width, unit mm? 4.0-that is the wire diameter, unit mm 6.0-6.0-that is the thickness of the upper and lower plastic cover, unit mm
3, the whole conveyor belt of the representation of the general coal with PVC and PVG conveyor belt with the whole strength flame retardant grade and width of the belt, said. Intensity level usually divided into: 4, 5, 6, 7, 8, 9, 10, 11, and up to 16 bands corresponding to the intensity: 680S, 800S, 1000S, 1250S, 1400S, 1600S, 1800S, 2000S, 2240S, 2500s, 2800S, 3100S and 3400S. Conveyor widths are: 500mm, 650mm, 800mm, 1000mm, 1200mm, 1400mm, 1600mm, 1800mm and so on.
China requires all coal mine conveyor belt used in our products must meet the relevant standards for the flame-retardant anti-static belt. Coal companies are now commonly used in conveyor belt: PVC flame retardant solid anti-static conveyor belt, PVG solid woven conveyor belt fire-retardant anti-static, flame-retardant anti-static steel cord conveyor belt. The main provisions of flame-retardant anti-static belt safety performance of the product: 1, alcohol burner combustion; 2, surface resistance; 3, roller friction; 4, analog gateway propane combustion. The test project to characterize the safety of products.

The distinction between the types of conveyor belt and Recognition

Called the transport conveyor belt, conveyor belt for carrying and transportation of materials play the role of the rubber and fiber, metal composite products, plastics and fabrics or composite products. Belt conveyor in the agricultural, industrial and mining enterprises and transportation in a variety of widely used to transport solid bulk and powder-like material or into items, conveyor belts can be continuous, high efficiency, large angle transport, conveyor belt safe operation, conveyor belt is easy to use, easy maintenance, low shipping costs, and shorten the transport distance, reducing construction costs, save manpower and resources

Many types of conveyor belt, in accordance with the use classification are: general purpose conveyor belts, flame-retardant anti-static conveyor belt, Rubber Conveyor Belt, heat-resistant conveyor belt, heat resistant conveyor belt, acid and alkali conveyor belt, oil resistant conveyor belt, cold resistant conveyor belt and so on.

Classified according to structural materials are: ordinary cotton canvas belt, nylon conveyor belt, polyester belt, steel cord conveyor belt, PVC solid woven conveyor belt, PVG solid woven conveyor belt, steel cable conveyor belt and so on.

Structure by product category are: layered belt, the whole conveyor belt, steel cord conveyor belt, steel cable conveyor belt, pipe conveyor, pattern conveyor belt, sidewall conveyor belt, conveyor belt, etc. by layer.

For convenience, we generally use a unified representation to represent a variety of conveyor belt, various types of conveyor belt that way

1, hierarchical representation of belt used (the standard representation of different, specific requirements, please refer to the standard GB7984): to NN200 1000 × 6 (6 +3) as an example, NN200 that is nylon 200, 1000 – The width of said tape, 6 -, said nylon layers, (6 +3) – that cover the upper and lower rubber conveyor belt were 6 mm and 3 mm thick.

2, said steel cord conveyor belt used Method: ST1000 H 1000? 4.0-6.0-6.0 example: ST1000-that is the strength specifications for 1000N/mm H-that is the level of performance rubber cover 1000 – that the products Width, unit mm? 4.0-that is the wire diameter, unit mm 6.0-6.0-that is the thickness of the upper and lower plastic cover, unit mm

3, the whole conveyor belt of the representation of the general coal with PVC and PVG conveyor belt with the whole strength flame retardant grade and width of the belt, said. Intensity level usually divided into: 4, 5, 6, 7, 8, 9, 10, 11, and up to 16 bands corresponding to the intensity: 680S, 800S, 1000S, 1250S, 1400S, 1600S, 1800S, 2000S, 2240S, 2500s, 2800S, 3100S and 3400S. Conveyor widths are: 500mm, 650mm, 800mm, 1000mm, 1200mm, 1400mm, 1600mm, 1800mm and so on.

China requires all coal mine conveyor belt used in our products must meet the relevant standards for the flame-retardant anti-static belt. Coal companies are now commonly used in conveyor belt: PVC flame retardant solid anti-static conveyor belt, PVG solid woven conveyor belt fire-retardant anti-static, flame-retardant anti-static steel cord conveyor belt. The main provisions of flame-retardant anti-static belt safety performance of the product: 1, alcohol burner combustion; 2, surface resistance; 3, roller friction; 4, analog gateway propane combustion. The test project to characterize the safety of products.

By admin • Posted in Conveyor Belts • Comments Off
March 7th, 2010

Conveyor belt conveyor components!

conveyor belt  conveyor components!
Conveyor is a conveyor belt, belt roller, roller tension device driver installed, feeding device, rack, discharging device so on. The advantage shown in the course of transmission without damaging food grains, transport capacity and transport distance great; the entire conveyor belt can be loading and unloading, both china conveyor belt manufacturer

The level of transport can also be inclined conveyor; both transport bulk food, but also the transport packaging of food, low power consumption, reliable and convenient operation, easy management, and work without noise. The main disadvantage is the high cost of conveyor belt, with lots of rolling bearings. End

, In the production practice must be regular checks, pay attention to maintenance and maintenance, to avoid the wind and sun and rain, to extend the service life of mechanical transportation.Nylon Conveyor Belt

By admin • Posted in Conveyor Belts • Comments Off
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