HOT PRODUCTS
Leeming is a high-tech company integrating R&D, production and distribution, and provides crusher, sand making, grinding equipment, mobile crushing station
conveyor belt deficiency
Jaw crushers usually do not work independently, but together with cone crushers, impact crushers, sand making machines, vibrating screens, etc., constitute a complete set of sand and gravel processing systems to achieve accurate processing of ore and rock and improve product pertinence , Increase its market value. Common production lines are: stone production line and sand production line.
Stone production line
On the basis of the stone production line, sand making machine equipment for fine crushing and shaping is added, which can realize the simultaneous production of machine-made sand and crushed stone. The entire production line is flexible in construction and diverse in output, which can meet the various processing requirements of customers. , To achieve the purpose of "one line with multiple uses", it is an ideal production line choice for producing highway surface materials, high-speed railway sand and gravel aggregates, hydropower station sand and gravel materials, port terminals and airport runways.


Characteristics and deficiency of the corrugated
2020-12-8 10. The lateral rigidity of the conveyor belt is strong, there are vertical rollers on both sides of the base band to prevent running deviation, and the materials being transported are basically in the center of the conveyor belt. Therefore, the conveyor belt does not run off. shortcomings: The deficiency of this machine is that the service life of wavy edge rubber belt of the corrugated sidewall belt conveyor is shorter than that of ordinary plane rubber belt. The wavy edge 2020-12-8 10. The lateral rigidity of the conveyor belt is strong, there are vertical rollers on both sides of the base band to prevent running deviation, and the materials being transported are basically in the center of the conveyor belt. Therefore, the conveyor belt does not run off. shortcomings: The deficiency of this machine is that the service life of wavy edge rubber belt of the corrugated sidewall belt conveyor is shorter than that of ordinary plane rubber belt. The wavy edge


CBGuard Conveyor Belt Monitoring - Introduction
2021-3-11 Conveyor belts are exposed to high loads and dangers. Apart from countless bending cycles, the belts suffer from permanent material loading impact, from worn, failing or wrongly adjusted conveyor parts, from entrapped objects and from normal aging. It is essential to detect damage as soon as it occurs so that action can be taken before it worsens.2021-3-11 Conveyor belts are exposed to high loads and dangers. Apart from countless bending cycles, the belts suffer from permanent material loading impact, from worn, failing or wrongly adjusted conveyor parts, from entrapped objects and from normal aging. It is essential to detect damage as soon as it occurs so that action can be taken before it worsens.


CBGuard Conveyor Belt Monitoring
2021-2-5 The CBGuard is recording all data, and comparing it with target values. If a deficiency exceeds the preset threshold, the system will automatically trigger a customized reaction. Complete knowledge of the conveyor belt condition The software generates a complete analysis of all threats to the belt.2021-2-5 The CBGuard is recording all data, and comparing it with target values. If a deficiency exceeds the preset threshold, the system will automatically trigger a customized reaction. Complete knowledge of the conveyor belt condition The software generates a complete analysis of all threats to the belt.


7 Common Conveyor Belt Problems Brief on
2021-2-22 1. Conveyor belt Mistracking . This issue happens when there is a conveyor belt following the issue. Following is the way toward overseeing and adjusting the belt onto the right way, and it’s basic to guarantee the smooth working and yield of your 2021-2-22 1. Conveyor belt Mistracking . This issue happens when there is a conveyor belt following the issue. Following is the way toward overseeing and adjusting the belt onto the right way, and it’s basic to guarantee the smooth working and yield of your


The Belt Position Control System for Portable Belt
2021-5-28 In view of the existing technical deficiency of portable belt conveyor, the purpose of kind of automatic belt position control system is focused on the belt deviation, with its compact structure, simple production process, and convenient installation and less maintenance.2021-5-28 In view of the existing technical deficiency of portable belt conveyor, the purpose of kind of automatic belt position control system is focused on the belt deviation, with its compact structure, simple production process, and convenient installation and less maintenance.


Conveyors in Mining - International Mining
2013-10-1 Phoenix Conveyor Belt Systems has launched what it describes as “a revolutionary conveyor belt monitoring system, the Phoenoguard PX. It is an all-for-one 24/7 device, which detects any deficiency of a moving conveyor belt – inside (-> steel cords, textiles, splices) and outside (-> rubber covers).2013-10-1 Phoenix Conveyor Belt Systems has launched what it describes as “a revolutionary conveyor belt monitoring system, the Phoenoguard PX. It is an all-for-one 24/7 device, which detects any deficiency of a moving conveyor belt – inside (-> steel cords, textiles, splices) and outside (-> rubber covers).


SECTION 6 Conveyor maintenanCe - Belt Cleaners
2014-9-11 both sides of the conveyor is a common de-ficiency in making conveyors maintainable. The open space along the more criti-cal side of a conveyor (the work area side where major tasks must be performed or where there is access to lifting equipment or other resources) should be at least the width of the belt (BW) plus 300 millimeters (122014-9-11 both sides of the conveyor is a common de-ficiency in making conveyors maintainable. The open space along the more criti-cal side of a conveyor (the work area side where major tasks must be performed or where there is access to lifting equipment or other resources) should be at least the width of the belt (BW) plus 300 millimeters (12


PNL Series Belt Conveyor - SHINI
1) Use of the conveyor belt is in any way openly opposed to what is indicated in the present instruction manual. 2) There are feeding defects. 3) There is a serious deficiency of the foreseen maintenance. 4) Non-authorized changes are adopted. 5) Spare parts that 1) Use of the conveyor belt is in any way openly opposed to what is indicated in the present instruction manual. 2) There are feeding defects. 3) There is a serious deficiency of the foreseen maintenance. 4) Non-authorized changes are adopted. 5) Spare parts that


THE GREAT OCEAN CONVEYOR
2015-7-8 portant feature of the conveyor is the production of deep water in the northern Atlantic. This aspect of the ocean's thermohaline circulation was thor- oughly described by Wrist (1935) and Wrist and Defant (1936) more than 50 years ago. In 1906 Chamberlain explored the importance of fresh-2015-7-8 portant feature of the conveyor is the production of deep water in the northern Atlantic. This aspect of the ocean's thermohaline circulation was thor- oughly described by Wrist (1935) and Wrist and Defant (1936) more than 50 years ago. In 1906 Chamberlain explored the importance of fresh-


Home-shleesu
*single Shiping belt conveyor system,standard single axis feeding function *equipped with induction film deficiency system *can be optional automatic membrane system*single Shiping belt conveyor system,standard single axis feeding function *equipped with induction film deficiency system *can be optional automatic membrane system


The research on the detection method of belt
2011-8-22 Abstract: Belt deviation is the most common failure during the operation of belt conveyor, and may cause tremendous harmfulness. In order to improve the intelligence of traditional video monitoring system of belt in coal mine, according to the deficiency of traditional system, we deeply studied various types of edge detection algorithm, and ...2011-8-22 Abstract: Belt deviation is the most common failure during the operation of belt conveyor, and may cause tremendous harmfulness. In order to improve the intelligence of traditional video monitoring system of belt in coal mine, according to the deficiency of traditional system, we deeply studied various types of edge detection algorithm, and ...


7 Common Conveyor Belt Problems Brief on
2021-2-22 1. Conveyor belt Mistracking . This issue happens when there is a conveyor belt following the issue. Following is the way toward overseeing and adjusting the belt onto the right way, and it’s basic to guarantee the smooth working and yield of your 2021-2-22 1. Conveyor belt Mistracking . This issue happens when there is a conveyor belt following the issue. Following is the way toward overseeing and adjusting the belt onto the right way, and it’s basic to guarantee the smooth working and yield of your


Deficiency response received from Sabia, Inc. on October
2012-11-19 Clearance above Conveyor Belt (inches) Up to 24 Up to 36 Conveyor Belt Width (inches) 30 to 72 48 to 72 Distance between Side Shielding (inches) 40 to 92 1 58 to 92 2. Construction 2.1 In reference to NUREG 1556, Vol. 3, Section 10.3, the SABIA drawing 600167 'Source Sled" is a detail drawing of the Source Holder as described in the NUREG.2012-11-19 Clearance above Conveyor Belt (inches) Up to 24 Up to 36 Conveyor Belt Width (inches) 30 to 72 48 to 72 Distance between Side Shielding (inches) 40 to 92 1 58 to 92 2. Construction 2.1 In reference to NUREG 1556, Vol. 3, Section 10.3, the SABIA drawing 600167 'Source Sled" is a detail drawing of the Source Holder as described in the NUREG.


SECTION 6 Conveyor maintenanCe - Belt Cleaners
2014-9-11 both sides of the conveyor is a common de-ficiency in making conveyors maintainable. The open space along the more criti-cal side of a conveyor (the work area side where major tasks must be performed or where there is access to lifting equipment or other resources) should be at least the width of the belt (BW) plus 300 millimeters (122014-9-11 both sides of the conveyor is a common de-ficiency in making conveyors maintainable. The open space along the more criti-cal side of a conveyor (the work area side where major tasks must be performed or where there is access to lifting equipment or other resources) should be at least the width of the belt (BW) plus 300 millimeters (12


Research on Indentation Rolling Resistance Based on ...
2019-2-10 The compression deformation of conveyor belt is as follows: where is the deformation of belt, R is the radius of idler, and is the maximum indentation depth of the belt in static state. The strain in the contact area between the conveyor belt and idler is where is the strain in the contact area between belt and idler, h is the thickness of cover layer, and .2019-2-10 The compression deformation of conveyor belt is as follows: where is the deformation of belt, R is the radius of idler, and is the maximum indentation depth of the belt in static state. The strain in the contact area between the conveyor belt and idler is where is the strain in the contact area between belt and idler, h is the thickness of cover layer, and .


Conveyor Design Summary - Helix Tech
2020-3-19 Conveyor Design Summary Report Conveyor No. CV 01 Material Description LIMESTONE, CRUSHED Low Bulk Density Angle of Repose High Bulk Density Surcharge Angle 1,360 kg/m3 1,450 kg/m3 38 deg 25 deg Material Lumpsize 10 mm Conveying Distance 69.44 m Design Capacity 777 tonnes/h Nett Lift / Lower (-) 11.2 m Belt Speed 3 m/s Belt Width Selected 750 ...2020-3-19 Conveyor Design Summary Report Conveyor No. CV 01 Material Description LIMESTONE, CRUSHED Low Bulk Density Angle of Repose High Bulk Density Surcharge Angle 1,360 kg/m3 1,450 kg/m3 38 deg 25 deg Material Lumpsize 10 mm Conveying Distance 69.44 m Design Capacity 777 tonnes/h Nett Lift / Lower (-) 11.2 m Belt Speed 3 m/s Belt Width Selected 750 ...


Gastrointestinal organoids: How they gut it out ...
2016-12-15 The renewal of an entire unit is performed by a conveyor belt mechanism from the bottom of the crypt to the top of the villus driven by self-renewing, undifferentiated and multipotent stem cells (Friedman, 1945, Leblond and Messier, 1958, Leblond and Stevens, 1948, Quastler and Sherman, 1959, Stevens and Leblond, 1947, Walker and Leblond, 1958).2016-12-15 The renewal of an entire unit is performed by a conveyor belt mechanism from the bottom of the crypt to the top of the villus driven by self-renewing, undifferentiated and multipotent stem cells (Friedman, 1945, Leblond and Messier, 1958, Leblond and Stevens, 1948, Quastler and Sherman, 1959, Stevens and Leblond, 1947, Walker and Leblond, 1958).


WinDIAS Leaf Area Meter - Leaf Area Measurement
Conveyor Belt Unit. The Conveyor Belt Unit comes as default with the Rapid System (or can be purchased separately to upgrade the Standard System). It enables rapid throughput of large numbers of leaves (up to 800 per hour) and also allows for Conveyor Belt Unit. The Conveyor Belt Unit comes as default with the Rapid System (or can be purchased separately to upgrade the Standard System). It enables rapid throughput of large numbers of leaves (up to 800 per hour) and also allows for


Xilinx WP433 Understanding and Mitigating System-Level
2021-5-28 assembly process — for example, on a conveyor belt. Static discharge then happens when the PCB comes into contact with a meta l surface, damaging the IC on the board. Cable Discharge Event (CDE) Cables can be triboelectrically charged when removed from a 2021-5-28 assembly process — for example, on a conveyor belt. Static discharge then happens when the PCB comes into contact with a meta l surface, damaging the IC on the board. Cable Discharge Event (CDE) Cables can be triboelectrically charged when removed from a


炭黑各型号英文描述及简写 (1)_百度文库 - Baidu
2013-5-28 The deficiency of the N326 compounds is lower tensile strength, abrasion and fatigue resistance. 7. N330 OTHER NAME PHYSICAL AND CHEMICAL PROPERTIES High Abrasion Furnace Black;HAF Carbon black N330 is the most widely used high abrasion furnace black.2013-5-28 The deficiency of the N326 compounds is lower tensile strength, abrasion and fatigue resistance. 7. N330 OTHER NAME PHYSICAL AND CHEMICAL PROPERTIES High Abrasion Furnace Black;HAF Carbon black N330 is the most widely used high abrasion furnace black.


Deficiency response received from Sabia, Inc. on October
2012-11-19 conveyor belt, a large object on the belt causing a jam at the analyzer, or a piece of large equipment, such as a crane, or tractor, colliding with the conveyor belt, crushing the analyzer. These conditions are considered as unlikely, however, under these 2012-11-19 conveyor belt, a large object on the belt causing a jam at the analyzer, or a piece of large equipment, such as a crane, or tractor, colliding with the conveyor belt, crushing the analyzer. These conditions are considered as unlikely, however, under these


Horizontal Belt Conveyor - Shini USA
2021-1-18 1) Use of the conveyor belt is in any way openly opposed to what is indicated in the present instruction manual. 2) There are feeding defects. 3) There is a serious deficiency of the foreseen maintenance. 4) Non-authorized changes are adopted. 5) Spare parts that are non-authorized or not suitable for the actual model are used.2021-1-18 1) Use of the conveyor belt is in any way openly opposed to what is indicated in the present instruction manual. 2) There are feeding defects. 3) There is a serious deficiency of the foreseen maintenance. 4) Non-authorized changes are adopted. 5) Spare parts that are non-authorized or not suitable for the actual model are used.


Research on Indentation Rolling Resistance Based on ...
2019-2-10 The compression deformation of conveyor belt is as follows: where is the deformation of belt, R is the radius of idler, and is the maximum indentation depth of the belt in static state. The strain in the contact area between the conveyor belt and idler is where is the strain in the contact area between belt and idler, h is the thickness of cover layer, and .2019-2-10 The compression deformation of conveyor belt is as follows: where is the deformation of belt, R is the radius of idler, and is the maximum indentation depth of the belt in static state. The strain in the contact area between the conveyor belt and idler is where is the strain in the contact area between belt and idler, h is the thickness of cover layer, and .


Health,nutritionandprosperity:amicroeconomicperspective
constrained by the (conveyor belt) technology of the mill and depended on the outputs of co-workers. The treated women did, however, spend more time and expend more energy on ... deficiency affects an individual’s aerobic capacity, endurance, energyefficiency,andworkoutput.Studiesofchildrenindicateconstrained by the (conveyor belt) technology of the mill and depended on the outputs of co-workers. The treated women did, however, spend more time and expend more energy on ... deficiency affects an individual’s aerobic capacity, endurance, energyefficiency,andworkoutput.Studiesofchildrenindicate


The Conveyor Belt Finish - Rowing Stories, Features ...
2017-7-11 To get the feel of this, sit at the finish with the blades squared and 2/3 buried. Think of this position as the end of the drive, where you have come to the end of the conveyor belt and you are no longer pulling. At this point the weight of the hands fall 2017-7-11 To get the feel of this, sit at the finish with the blades squared and 2/3 buried. Think of this position as the end of the drive, where you have come to the end of the conveyor belt and you are no longer pulling. At this point the weight of the hands fall


Conveyor Design Summary - Helix Tech
2020-3-19 Note Belt lift during starting due to light belt and tight geometry of conveyor. Refer to Vertical curves report. Starting torque should be reduced if possible. Suggest using a VVVF drive to reduce starting torque and removing the Fluid Coupling. This would also result in a better match with the Shaft mounted gearbox.2020-3-19 Note Belt lift during starting due to light belt and tight geometry of conveyor. Refer to Vertical curves report. Starting torque should be reduced if possible. Suggest using a VVVF drive to reduce starting torque and removing the Fluid Coupling. This would also result in a better match with the Shaft mounted gearbox.


The Great Ocean Conveyor - JSTOR
by the conveyor is best constrained by radiocarbon measurements on samples of deep water from the Atlantic Ocean. Some physical oceanographers might dispute this claim and opt instead for es-timates derived from a combination of current-meter measurements and geostrophic flow cal-culations. Fortunately the two approaches yield similar answers.by the conveyor is best constrained by radiocarbon measurements on samples of deep water from the Atlantic Ocean. Some physical oceanographers might dispute this claim and opt instead for es-timates derived from a combination of current-meter measurements and geostrophic flow cal-culations. Fortunately the two approaches yield similar answers.


Gastrointestinal organoids: How they gut it out ...
2016-12-15 The renewal of an entire unit is performed by a conveyor belt mechanism from the bottom of the crypt to the top of the villus driven by self-renewing, undifferentiated and multipotent stem cells (Friedman, 1945, Leblond and Messier, 1958, Leblond and Stevens, 1948, Quastler and Sherman, 1959, Stevens and Leblond, 1947, Walker and Leblond, 1958).2016-12-15 The renewal of an entire unit is performed by a conveyor belt mechanism from the bottom of the crypt to the top of the villus driven by self-renewing, undifferentiated and multipotent stem cells (Friedman, 1945, Leblond and Messier, 1958, Leblond and Stevens, 1948, Quastler and Sherman, 1959, Stevens and Leblond, 1947, Walker and Leblond, 1958).


Xilinx WP433 Understanding and Mitigating System-Level
2021-5-28 assembly process — for example, on a conveyor belt. Static discharge then happens when the PCB comes into contact with a meta l surface, damaging the IC on the board. Cable Discharge Event (CDE) Cables can be triboelectrically charged when removed from a 2021-5-28 assembly process — for example, on a conveyor belt. Static discharge then happens when the PCB comes into contact with a meta l surface, damaging the IC on the board. Cable Discharge Event (CDE) Cables can be triboelectrically charged when removed from a


炭黑各型号英文描述及简写 (1)_百度文库 - Baidu
2013-5-28 The deficiency of the N326 compounds is lower tensile strength, abrasion and fatigue resistance. 7. N330 OTHER NAME PHYSICAL AND CHEMICAL PROPERTIES High Abrasion Furnace Black;HAF Carbon black N330 is the most widely used high abrasion furnace black.2013-5-28 The deficiency of the N326 compounds is lower tensile strength, abrasion and fatigue resistance. 7. N330 OTHER NAME PHYSICAL AND CHEMICAL PROPERTIES High Abrasion Furnace Black;HAF Carbon black N330 is the most widely used high abrasion furnace black.


Deficiency response received from Sabia, Inc. on October
2012-11-19 conveyor belt, a large object on the belt causing a jam at the analyzer, or a piece of large equipment, such as a crane, or tractor, colliding with the conveyor belt, crushing the analyzer. These conditions are considered as unlikely, however, under these 2012-11-19 conveyor belt, a large object on the belt causing a jam at the analyzer, or a piece of large equipment, such as a crane, or tractor, colliding with the conveyor belt, crushing the analyzer. These conditions are considered as unlikely, however, under these


Conveyor Belt Entrapment Trauma in Children: An
2020-7-2 deficiency in patients with primary immune-mediated peripheral neuropathies. J Neurol Sci. 2014;345:184-8. Conveyor Belt Entrapment Trauma in Children: An Unreported Menace A retrospective study was conducted including all the children who sustained motorized machine belt entrapment injuries. Six children included in study had mean (SD) Glosgow coma scale2020-7-2 deficiency in patients with primary immune-mediated peripheral neuropathies. J Neurol Sci. 2014;345:184-8. Conveyor Belt Entrapment Trauma in Children: An Unreported Menace A retrospective study was conducted including all the children who sustained motorized machine belt entrapment injuries. Six children included in study had mean (SD) Glosgow coma scale


REQUISITION PROPOSAL
2020-1-21 The Alabama State Port Authority will be accepting BIDS on Conveyor Belt. Specifications for all belts Specifications for all belts Elongation at Break Less than 30% DIN Abrasion Rating 100 or Less Belt Fabric Polyester/Nylon Permanent Elongation 2% or Less ... have occurred during shipment or a deficiency exist, the supplier shall take ...2020-1-21 The Alabama State Port Authority will be accepting BIDS on Conveyor Belt. Specifications for all belts Specifications for all belts Elongation at Break Less than 30% DIN Abrasion Rating 100 or Less Belt Fabric Polyester/Nylon Permanent Elongation 2% or Less ... have occurred during shipment or a deficiency exist, the supplier shall take ...


Advances in Mechanical Engineering 2018, Vol. 10(7) 1–9 ...
2020-12-2 ment of belt conveyor design technology, the pipe belt conveyor has gradually gained popularity of engineer-ing. Under this circumstance, indentation rolling resis-tance which makes up a relatively significant share (61%) among the running resistance of belt conveyor1 has a need for further study to achieve energy saving.2 As shown in Figure 1 ...2020-12-2 ment of belt conveyor design technology, the pipe belt conveyor has gradually gained popularity of engineer-ing. Under this circumstance, indentation rolling resis-tance which makes up a relatively significant share (61%) among the running resistance of belt conveyor1 has a need for further study to achieve energy saving.2 As shown in Figure 1 ...


The Conveyor Belt Finish - Rowing Stories, Features ...
2017-7-11 To get the feel of this, sit at the finish with the blades squared and 2/3 buried. Think of this position as the end of the drive, where you have come to the end of the conveyor belt and you are no longer pulling. At this point the weight of the hands fall 2017-7-11 To get the feel of this, sit at the finish with the blades squared and 2/3 buried. Think of this position as the end of the drive, where you have come to the end of the conveyor belt and you are no longer pulling. At this point the weight of the hands fall


Conveyor Design for Mining Machines - 911
2021-1-2 The swing conveyor belt showed a tendency to ride over to one side while turned and loading, particularly when the conveyor was raised, causing the conveyor belt to ride on a transverse slope. This problem was minimized by maintaining proper belt adjustment and belt tension which, however, did not fully eliminate occasional scraping of the belt against the side of the conveyor.2021-1-2 The swing conveyor belt showed a tendency to ride over to one side while turned and loading, particularly when the conveyor was raised, causing the conveyor belt to ride on a transverse slope. This problem was minimized by maintaining proper belt adjustment and belt tension which, however, did not fully eliminate occasional scraping of the belt against the side of the conveyor.


Conveyor Design Summary - Helix Tech
2020-3-19 Note Belt lift during starting due to light belt and tight geometry of conveyor. Refer to Vertical curves report. Starting torque should be reduced if possible. Suggest using a VVVF drive to reduce starting torque and removing the Fluid Coupling. This would also result in a better match with the Shaft mounted gearbox.2020-3-19 Note Belt lift during starting due to light belt and tight geometry of conveyor. Refer to Vertical curves report. Starting torque should be reduced if possible. Suggest using a VVVF drive to reduce starting torque and removing the Fluid Coupling. This would also result in a better match with the Shaft mounted gearbox.


Splicing method and classification of rubber conveyor
2020-9-21 However, repairing the rubber conveyor belt by this method will have more obvious joint marks and a relatively large loss of strength. It is only suitable for the repair of the small area layer of the relatively light rubber fabric core conveyor belt and the splicing 2020-9-21 However, repairing the rubber conveyor belt by this method will have more obvious joint marks and a relatively large loss of strength. It is only suitable for the repair of the small area layer of the relatively light rubber fabric core conveyor belt and the splicing


Xilinx WP433 Understanding and Mitigating System-Level
2021-5-28 assembly process — for example, on a conveyor belt. Static discharge then happens when the PCB comes into contact with a meta l surface, damaging the IC on the board. Cable Discharge Event (CDE) Cables can be triboelectrically charged when removed from a 2021-5-28 assembly process — for example, on a conveyor belt. Static discharge then happens when the PCB comes into contact with a meta l surface, damaging the IC on the board. Cable Discharge Event (CDE) Cables can be triboelectrically charged when removed from a


Health,nutritionandprosperity:amicroeconomicperspective
deficiency affects an individual’s aerobic capacity, endurance, energyefficiency,andworkoutput.Studiesofchildrenindicate important impacts on cognition (9). These mechanisms suggest a sizeable impact on economic success although there is controversy about the magnitude of that effect, with large impacts having been found in only a few studies. Importantdeficiency affects an individual’s aerobic capacity, endurance, energyefficiency,andworkoutput.Studiesofchildrenindicate important impacts on cognition (9). These mechanisms suggest a sizeable impact on economic success although there is controversy about the magnitude of that effect, with large impacts having been found in only a few studies. Important

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