The Experts below are selected from a list of 93 Experts worldwide ranked by ideXlab platform
David Hoffmann - One of the best experts on this subject based on the ideXlab platform.
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detection of anchoring columns in low trellis
Agronomy research, 2014Co-Authors: David Hoffmann, Aleksandra Rybka, M. Linda, M. DvořákAbstract:Low trellis of hop field was emerged in the Czech Republic in the mid-nineties of the 20 th century. Growing hops in a low trellis has already been tested in 1991 by Hop Research Institute Ltd. in Žatec. However, at that time, the lack of adequate (the dwarf) varieties and special techniques prevent to their expansion. For full use low trellis is necessary mechanization, that is already currently being developed. The main advantage of growing hops at low trellis is costs reduce. Some experts say cost reduction to 50%. Cost reduction is the result of simplifying the spring and harvest work (using a mobile harvester). Currently, a prototype of a Mechanical Cutter is tested in field conditions. Activity of Mechanical Cutter is now controlled directly by the tractor driver. This control of Mechanical Cutter (or rather inter-axle carrier on which it is Cutter mounted) puts on the tractor driver too high demands on precision. Failure to comply with the conditions set comes in contact the trimming disc with anchor pillar and the mutual damage. The movement of inter-axle carrier would therefore be appropriate automatically. But at first, it is necessary to solve recognition (detection) anchoring columns of the low trellis. During the cutting of hops needed to ensure the most accurate copy of the columns by the trimming disc, to be trimmed hop vines and hops growing in close proximity (distance hops from the anchoring column is about 150 mm). The paper presents several types of sensors and describes their advantages and disadvantages. For laboratory test was developed model low trellis comprising also hop vine, at which were referred sensors tested. This article analyzes the measured results of individual sensors and it is shown, that not all sensors are suitable for this field application. In conclusion are recommendations for follow-up research.
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design a drive for interaxle Mechanical Cutter used in low trellises
Agronomy research, 2013Co-Authors: David Hoffmann, P. Heřmánek, Aleksandra Rybka, I. HonzíkAbstract:A Mechanical Cutter (similar to a special sprinkler for chemical pruning) serves to prune new hopvine shoots in spring. Depending on the right timing and quality of pruning depends the later yield, which is why pruning is one of the most important agrotechnical operations. Double-disc Mechanical Cutter used with high trellises cannot be used with the technology of low trellises. Due to the effort to minimise the chemical environmental burden, special sprinklers for chemical pruning used abroad are considered inappropriate. This was the reason which led to a design for a Mechanical Cutter operating in low trellises. The article describes a hydraulic circuit design and laboratory measurements of an experimental model of Mechanical Cutter.
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technical project for hop cutting equipment in low trellis system
2011Co-Authors: David Hoffmann, Aleksandra Rybka, Petr Hermanek, I. HonzíkAbstract:Hop pruning is the main spring agrotechnical operation. That is the reason why great emphasis is placed on exact timing of hop pruning operation and on the use of suitable machinery. Double disc Mechanical Cutter used for high trellis is unsuitable for low trellis system. Development in low trellis has recently been putting pressure on designing a proper Cutter. There are two versions of Cutters: Mechanical Cutter and adapted sprinkler for chemical hop pruning. This paper contains construction analysis and agrotechnical requirements for Mechanical Cutter. Furthermore there is a detailed description of a design for fixed extension arm, Mechanical Cutter rotor, and telescopic copy wheel used to set up the cut height. The paper also mentions an experimental calculation of FEM analysis of cutting disc and an overall design of Mechanical Cutter. FEM analysis also contains a graphic interpretation of results which illustrate a deformation caused by critical frequency of cutting disc rotation. The design for Mechanical Cutter assembly contains also basic visualization of the whole device with distribution of hydraulic hoses to distribute pressure oil. The conclusion deals with a discussion and a suggestion for a consequential research.
I. Honzík - One of the best experts on this subject based on the ideXlab platform.
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design a drive for interaxle Mechanical Cutter used in low trellises
Agronomy research, 2013Co-Authors: David Hoffmann, P. Heřmánek, Aleksandra Rybka, I. HonzíkAbstract:A Mechanical Cutter (similar to a special sprinkler for chemical pruning) serves to prune new hopvine shoots in spring. Depending on the right timing and quality of pruning depends the later yield, which is why pruning is one of the most important agrotechnical operations. Double-disc Mechanical Cutter used with high trellises cannot be used with the technology of low trellises. Due to the effort to minimise the chemical environmental burden, special sprinklers for chemical pruning used abroad are considered inappropriate. This was the reason which led to a design for a Mechanical Cutter operating in low trellises. The article describes a hydraulic circuit design and laboratory measurements of an experimental model of Mechanical Cutter.
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technical project for hop cutting equipment in low trellis system
2011Co-Authors: David Hoffmann, Aleksandra Rybka, Petr Hermanek, I. HonzíkAbstract:Hop pruning is the main spring agrotechnical operation. That is the reason why great emphasis is placed on exact timing of hop pruning operation and on the use of suitable machinery. Double disc Mechanical Cutter used for high trellis is unsuitable for low trellis system. Development in low trellis has recently been putting pressure on designing a proper Cutter. There are two versions of Cutters: Mechanical Cutter and adapted sprinkler for chemical hop pruning. This paper contains construction analysis and agrotechnical requirements for Mechanical Cutter. Furthermore there is a detailed description of a design for fixed extension arm, Mechanical Cutter rotor, and telescopic copy wheel used to set up the cut height. The paper also mentions an experimental calculation of FEM analysis of cutting disc and an overall design of Mechanical Cutter. FEM analysis also contains a graphic interpretation of results which illustrate a deformation caused by critical frequency of cutting disc rotation. The design for Mechanical Cutter assembly contains also basic visualization of the whole device with distribution of hydraulic hoses to distribute pressure oil. The conclusion deals with a discussion and a suggestion for a consequential research.
Aleksandra Rybka - One of the best experts on this subject based on the ideXlab platform.
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detection of anchoring columns in low trellis
Agronomy research, 2014Co-Authors: David Hoffmann, Aleksandra Rybka, M. Linda, M. DvořákAbstract:Low trellis of hop field was emerged in the Czech Republic in the mid-nineties of the 20 th century. Growing hops in a low trellis has already been tested in 1991 by Hop Research Institute Ltd. in Žatec. However, at that time, the lack of adequate (the dwarf) varieties and special techniques prevent to their expansion. For full use low trellis is necessary mechanization, that is already currently being developed. The main advantage of growing hops at low trellis is costs reduce. Some experts say cost reduction to 50%. Cost reduction is the result of simplifying the spring and harvest work (using a mobile harvester). Currently, a prototype of a Mechanical Cutter is tested in field conditions. Activity of Mechanical Cutter is now controlled directly by the tractor driver. This control of Mechanical Cutter (or rather inter-axle carrier on which it is Cutter mounted) puts on the tractor driver too high demands on precision. Failure to comply with the conditions set comes in contact the trimming disc with anchor pillar and the mutual damage. The movement of inter-axle carrier would therefore be appropriate automatically. But at first, it is necessary to solve recognition (detection) anchoring columns of the low trellis. During the cutting of hops needed to ensure the most accurate copy of the columns by the trimming disc, to be trimmed hop vines and hops growing in close proximity (distance hops from the anchoring column is about 150 mm). The paper presents several types of sensors and describes their advantages and disadvantages. For laboratory test was developed model low trellis comprising also hop vine, at which were referred sensors tested. This article analyzes the measured results of individual sensors and it is shown, that not all sensors are suitable for this field application. In conclusion are recommendations for follow-up research.
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design a drive for interaxle Mechanical Cutter used in low trellises
Agronomy research, 2013Co-Authors: David Hoffmann, P. Heřmánek, Aleksandra Rybka, I. HonzíkAbstract:A Mechanical Cutter (similar to a special sprinkler for chemical pruning) serves to prune new hopvine shoots in spring. Depending on the right timing and quality of pruning depends the later yield, which is why pruning is one of the most important agrotechnical operations. Double-disc Mechanical Cutter used with high trellises cannot be used with the technology of low trellises. Due to the effort to minimise the chemical environmental burden, special sprinklers for chemical pruning used abroad are considered inappropriate. This was the reason which led to a design for a Mechanical Cutter operating in low trellises. The article describes a hydraulic circuit design and laboratory measurements of an experimental model of Mechanical Cutter.
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technical project for hop cutting equipment in low trellis system
2011Co-Authors: David Hoffmann, Aleksandra Rybka, Petr Hermanek, I. HonzíkAbstract:Hop pruning is the main spring agrotechnical operation. That is the reason why great emphasis is placed on exact timing of hop pruning operation and on the use of suitable machinery. Double disc Mechanical Cutter used for high trellis is unsuitable for low trellis system. Development in low trellis has recently been putting pressure on designing a proper Cutter. There are two versions of Cutters: Mechanical Cutter and adapted sprinkler for chemical hop pruning. This paper contains construction analysis and agrotechnical requirements for Mechanical Cutter. Furthermore there is a detailed description of a design for fixed extension arm, Mechanical Cutter rotor, and telescopic copy wheel used to set up the cut height. The paper also mentions an experimental calculation of FEM analysis of cutting disc and an overall design of Mechanical Cutter. FEM analysis also contains a graphic interpretation of results which illustrate a deformation caused by critical frequency of cutting disc rotation. The design for Mechanical Cutter assembly contains also basic visualization of the whole device with distribution of hydraulic hoses to distribute pressure oil. The conclusion deals with a discussion and a suggestion for a consequential research.
Deji Akinwande - One of the best experts on this subject based on the ideXlab platform.
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Fabrication, characterization and applications of graphene electronic tattoos
Nature Protocols, 2021Co-Authors: Dmitry Kireev, Shideh Kabiri Ameri, Alena Nederveld, Jameson Kampfe, Hongwoo Jang, Deji AkinwandeAbstract:This protocol describes how to fabricate graphene electronic tattoos (GETs) that offer unique electroMechanical properties. The GETs can be used for a variety of applications, including wearables, personalized biosensors and human–computer interfaces. Numerous fields of science and technology, including healthcare, robotics and bioelectronics, have begun to switch their research direction from developing ‘high-end, high-cost’ tools towards ‘high-end, low-cost’ solutions. Graphene electronic tattoos (GETs), whose fabrication protocol is discussed in this work, are ideal building blocks of future wearable technology due to their outstanding electroMechanical properties. The GETs are composed of high-quality, large-scale graphene that is transferred onto tattoo paper, resulting in an electronic device that is applied onto skin like a temporary tattoo. Here, we provide a comprehensive GET fabrication protocol, starting from graphene growth and ending with integration onto human skin. The methodology presented is unique since it utilizes high-quality electronic-grade graphene, while the processing is done by using low-cost and off-the-shelf methods, such as a Mechanical Cutter plotter. The GETs can be either used in combination with advanced scientific equipment to perform precision experiments, or with low-cost electrophysiology boards, to conduct similar operations from home. In this protocol, we showcase how GETs can be applied onto the human body and how they can be used to obtain a variety of biopotentials, including electroencephalogram (brain waves), electrocardiogram (heart activity), electromyogram (muscle activity), as well as monitoring of body temperature and hydration. With graphene available from commercial sources, the whole protocol consumes ~3 h of labor and does not require highly trained personnel. The protocol described in this work can be readily replicated in simple laboratories, including high school facilities.
Abdul Shukor, Fairul Azhar - One of the best experts on this subject based on the ideXlab platform.
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Design Of A Linear Ocsillatory Actuator For Oil Palm Mechanical Cutter
2008Co-Authors: Abdul Shukor, Fairul AzharAbstract:At the early stage of their use, linear motors were particularly dedicated to transportation systems. Nowadays, linear motors are meant to replace a system using a rotating motor and a transmission to realize a linear movement. With linear motors, the performance of the system increased considerably since the Mechanical limitations are removed. This leads to a better precision, a higher acceleration and a higher speed of the moving part. Therefore, direct drives with linear motors are increasingly used in industrial applications although these solutions normally lead to more investment costs. In this research, the linear motor would be applied as part of an oil palm motorized Cutter system. Due to it advantages especially in term of producing linear motion the efficiency of the existing motorized Cutter system is expected to improve. The existing system uses intermediate shaft and gears in order to convert rotary motion to linear motion for harvesting activity. However, the rotational transmissions become ineffective when it is used for palm trees higher than 5 meters. It is due to the fact that intermediate shaft bends as the length increases. On top of that, it will increase the overall weight of the Mechanical system as the length increases. The new system of oil palm motorized Cutter employs the linear oscillatory actuator (LOA) to replace the intermediate shaft and gear to produce linear motion. It eliminates the Mechanical limit because there is no more intermediate shaft used in this system. The function of the intermediate shaft will be replaced by the copper wire in order to energize the LOA. The LOA is an actuator in which a mover performs a reciprocating motion in a range of stroke as a result of being driven by a current having a sinusoidal or pulse wave form. The structure of LOA has been designed using FEM software by previous researcher. The drawback of the previous model is the lack of force to perform harvesting activity. Therefore in this research, the LOA design has been optimized to achieve high thrust of LOA. The method used in this design optimization is Permeance Analysis Method (PAM). The design optimization is done by varying the size of permanent magnets and coils. In this design, it is ensured that the magnetic density saturation does not occur because, if it does, the thrust of the LOA will not increase even though the input current is increased. The constrain in this research is to develop the LOA within its limited overall weight. It is to make sure the LOA is mobile to the users. As a result, not only the high starter thrust of LOA about 200 N has been developed, but it is also light in weight which 2.0 kg and small in size which is 3.14×10-4 m3 in volume