propagator Articles
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Flexural wave propagation and dynamic stress concentration in a multi-stepped plate using acoustical wave propagator method
In this paper, we introduce an explicit acoustical wave propagator method to investigate the flexural wave propagation and dynamic stress concentration in a multi-stepped plate. To implement the operation of the acoustical wave propagator on an initial state, a new combined scheme with Chebyshev Polynomial Expansion and Fast Fourier Transformation is described in detail. Its numerical efficiency ...
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Interval type-1 non-singleton type-2 fuzzy logic systems are type-2 adaptive neuro-fuzzy inference systems
This article presents a new learning methodology based on a hybrid algorithm for interval type-1 non-singleton type-2 TSK fuzzy logic systems (FLS). Using input-output data pairs during the forward pass of the training process, the interval type-1 non-singleton type-2 TSK FLS output is calculated and the consequent parameters are estimated by the recursive least-squares (RLS) method. In the ...
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Project - Middle East - vegetable glasshouse
Westland Greenhouse Projects was assigned by BayWa – Al Dahra Agriculture to develop a high-tech greenhouse project in Al Ain, United Arab Emirates. The almost 12-hectare Al Dahra BayWa facility is divided in two production greenhouses of 5 hectares each, plus a hybrid compartment for both production and propagation accompanied by an area for packing, irrigation and staff. In full ...
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Building a baked anode material with PFC - Case Study
Project Description A baked anode is made of a complex material, obtained by mixing and baking different petrol coke grains, with different size distributions, with a pitch. Hydro PMT needs to study how cracks propagate in such a material – both within and between grains. Representing properly the non-spherical grain shapes, as well as the porosity, both between grains and within the coke ...
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The Roll-Air greenhouse offers the protected outdoor climate we were looking for.
Plant Select (B) boosts growth ambitions with new 2 ha film greenhouse Plant Select from Rijkevorsel, Belgium, supplies in-vitro planting material and licensing programmes worldwide and is a major European ornamental plant cultivation company. Based on innovation, specialisation and sustainable cultivation, it has a leading international position in various crops, of which Fargesia, ...
By Rovero
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5 tips on how to light your hemp crop for maximum yields, quality and potency
Lighting for commercial hemp production – 5 tips on how to light your hemp crop for maximum yields, quality and potency. We know that light is essential for plant growth, and for a plant such as hemp, which is adapted to high light levels, and where yields and quality are heavily influenced by light intensity – having supplemental or a high-quality sole source lighting systems is ...
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Case study: AACAL, Amarillo ISD Amarillo, TX
The Challenge: The Amarillo Area Center for Advanced Learning needed a solution for the hard water scaling issues they were experiencing in their greenhouse. The cool cell filter for the greenhouse’s cooling system had to be replaced every two weeks, the mist heads in the propagation tent required cleaning every few days and salt deposits were apparent on the plant cuttings. These issues ...
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PROPAGATION OF CUTTINGS USING EH-POWERGROUND ELECTRIC HEATING MATS
PROPAGATION OF CUTTINGS USING EH-POWERGROUND ELECTRIC HEATING MATS Electric heating mats are used to increase the rooting and germination rate of cuttings. They are manufactured specifically for this purpose and made in sizes to suit new or existing growing beds. The purpose of using heat specifically in the root zone of cuttings is to induce dormancy in the upper vegetative part and to ...
By Cofilea srl
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Grain Silo Level Monitoring
ABM’s non-contact level sensors are used in the Agriculture industry for monitoring silos, process tanks and storage containers. For this application, ABM’s non-contact ultrasonic sensors were used to continuously monitor grain level in silos. The sensors are self-cleaning, eliminating build-up on the transducer face for maintenance free operation. During filling conditions the ...
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Date palm micropropagation in Saudi Arabia: policies and technology transfer
Saudi Arabia harbours one of the most important genetic centres of origin of date palm. Over the centuries this tree has been crucial for the survival of nomadic tribes in Saudi Arabia. Today, the fruits of this "tree-of-life" are highly valued as a local delicacy. Small plantlets purchased to replace non-productive palms and plantations infested with the red weevil, fetch high prices. ...
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A review of bovine spongiform encephalopathy and its management in Canada and the USA
Geographic proximity and a long history of integration between US and Canadian cattle industries have resulted in similar management of BSE risk factors. Both countries have had a single imported case of BSE followed by multiple endemic cases of the bovine disease. Comparable risk management strategies have been put in place, such as a ban on the feeding of ruminant materials to other ruminants, ...
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Molter BV expands nursery with foil greenhouse of over 1,400 m2
Perennial plant grower Molter BV in Noordwijkerhout (NL) is making good progress. The new strategy and a new Rovero film greenhouse offer more space for activities at the beginning of the chain: breeding, tissue culture and the propagation of plants from seed, cuttings and tissue culture. "We are scaling down the actual cultivation of plants, but in terms of added value we are growing nicely," ...
By Rovero
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Technical efficiency of organic tea smallholding sector in Sri Lanka: a stochastic frontier analysis
Organic tea is emerging as a major farming activity in Sri Lanka. In this paper, using a stochastic frontier analysis, we analyse the technical efficiency of organic tea smallholdings in the mid country wet zone of Sri Lanka. The Cobb-Douglas functional specifications are found to be an adequate representation of the cross-sectional data obtained in 2002. Our results indicate that there is great ...
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Grow to Order and Seed Collection
Local provenance planting is important to help restore our natural habitats and retain the genetic integrity of plant populations and is strongly recommended for projects within or near environmentally sensitive areas. Forward planning is essential when undertaking local provenance seed collection as there are seasonal constraints such as seed maturation time, finding seed donor sites and gaining ...
By BritishFlora
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Dam breach modelling: influence on downstream water levels and a proposal of a physically based module for flood propagation software
The influence exerted by the method used for computing the dam breach hydrograph on the simulated maximum water levels throughout the downstream valley is essential for selecting a specific computing module to be implemented in the numerical codes used by practitioners. This module should be able to balance the need for a reasonable physical description of the phenomenon and, at the same ...
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Comparison of hybrid models for daily streamflow prediction in a forested basin
Accurate forecasting of daily streamflow is essential for water resource planning and management. As a typical non-stationary time series, it is difficult to avoid the effects of noise in the hydrological data. In this study, the wavelet threshold de-noising method was applied to pre-process daily flow data from a small forested basin. The key factors influencing the de-noising results, such ...
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Property claims in genetically and non-genetically modified crops: intellectual property rights vs. brand property rights in postindustrial knowledge societies
Conceptualising the ongoing conflict over genetically modified vs. non-genetically modified crops in the frame of property rights, one can see that economic valorisation dynamics and aspirations are working on both sides, within two differently evolving agri-food paradigms, with biotechnology companies propagating intellectual property rights on seeds and crops within a productivist strategy, and ...
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Growing substrates for aromatic plant species in green roofs and water runoff quality: pilot experiments in a Mediterranean climate
Green roof technology has evolved in recent years as a potential solution to promote vegetation in urban areas. Green roof studies for Mediterranean climates, where extended drought periods in summer contrast with cold and rainy periods in winter, are still scarce. The present research study assesses the use of substrates with different compositions for the growth of six aromatic plant ...
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Use of Ultrasound for Characterizing Dairy Products
It has been known for a long time that acoustic measurements offer some unique features for characterizing liquid food products in their intact state, without any preparation or destruction of the product sample. Acoustic characterization can yield information about fat content, droplet size distribution, and kinetics of product variation with time. Furthermore, acoustic methods are very ...
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Motivations for organic farming among farmers from Malopolska Province, Poland
Poor condition of Polish agriculture, clean soil environment and extensive methods of production make Poland particularly suitable for developing environmentally friendly forms of farming. In the last decade the number of people who have decided to convert from old, conventional farms to new, environmentally friendly ones, has markedly increased. The objective of this study was to find out what ...
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