HEMP GROWTH AND FIBRE PROCESSING POSSIBILITIES IN LATVIA

Use of hemp fibre is rapidly increasing in Europe. This tendency is related to carbon and glass fibre substitution with recycled and biodegradable raw materials for use in car production. Scientists and manufacturers work to obtain new composite materials where hemp fibre will be as reinforcement. Hemp fibres are light and with high tensile strength comparing with other technical fibres. Advantage – eco–friendly utilization possibilities. The research work to determine hemp fibre efficiency was carried out for two years at the Latgale Agricultural Research Centre. In this work different hemp fibre varieties were used. To determine the most suitable varieties for Latvian climatic conditions all the varieties were tested at the laboratories of Riga Technical University, Institute of Textile Material Technologies and Design. We are looking for new possibilities to make technical textile samples from different hemp fibre varieties. In cooperation with Laboratories of the Scientific Institute of Food Safety, Animal Health and Environment “BIOR” the amount of tetrahydrocannabinol (THC) in different variety cannabis plants were determined. It was concluded that amount of THC of different open–air cultivation varieties grown in Latvia is different but anyway this amount is much below the acceptable norm

Comparative Technological And Commercial Evaluation of Flax Varieties For The Revival of Flax Growing In Latvia

As renewable raw material flax increasingly gain more importance as the range of its use is spreading more and more. Besides the conventional uses in home textiles, clothing and sails products, demand of flax raw materials for technical uses increases rapidly as flax fibers have high specific properties, become components of biodegradable composites, environmental friendly isolation materials, besides flax shives pay attention as well as components of environment friendly building materials. Unfortunately in Latvia during last decades flax crop production had decreased rapidly and nowadays reintroduction of flax growing traditions and conditions are become more and more actual. In spite of depression in sector, in Agriculture Science Centre of Latgale are not interrupted experiments on development of local flax lines. Field trials were sown at the Centre in 2010 and 98 flax lines investigated. In this article reflected analysis results of one perspective local fibers flax line from different aspects and its properties comparison with the standard fibers flax variety Vega 2

Learning to Perform Tasks in Interactive Textual Environments

Interaktīvas tekstuālas piedzīvojumu spēles var izmantot, lai pārbaudītu mašīnmācīšanās aģentu spējas tikt galā ar dažādiem izaicinājumiem, kas saistīti ar dabiskās valodas izpratni, problēmu risināšanu un atbilžu meklēšanu, vai tādas darbības izvēles stratēģiju apgūšana, kas vispārinās uz iepriekš nesastaptām vidēm. TextWorld platforma ir šādiem pētījumiem domāts ietvars un palīgrīki, ar kuru palīdzību var darbināt daudzas iepriekšpublicētas teksta piedzīvojumu spēles, vai arī definēt un ģenerēt jaunas spēles, dažādās sarežģītības pakāpēs un gandrīz bezgalīgās variācijās. Šajā darbā aprakstīta tāda algoritmiska orākula (oracle) ieviešana, kas var veiksmīgi atrisināt spēles no 3 dažādām iepriekšpublicētām spēļu kopām TextWorld platformā, kā arī orākula izmantošana kā apmācības datu avotu eksperimentiem, lai pārbaudītu mašīnmācīšanās modeļa, kas balstīts uz GPT­2, spēju iemācīties atrisināt šīs spēles. Ir iegūti daudzsološi sākotnēji rezultāti, kas liek domāt, ka GPT­2 arhitektūra var iemācīties –vismaz daļēji– atdarināt orākula darbību. Apmācītā modeļa snieguma līmeņa atšķirības to parbaudot uz divām dažādām testa spēļu kopām rada dažus interesantus jautājumus par to, kādi faktori varētu veicināt tā spēju vai nespēju vispārināties uz iepriekš neredzētām spēļu vidēm, un norāda uz dažiem interesantiem virzieniem turpmākiem eksperimentiem.Learning to Perform Tasks in Interactive Textual Environments Interactive text­adventure games can be used as a versatile proving ground to test the abilities of machine­learning agents to deal with various challenges related to natural language understanding, exploration and problem solving, or learning action selection policies that generalize across a range of new environments. The TextWorld platform is a research platform that can run many existing text­adventure games, and can also be used to generate new games of varying degrees of difficulty and in almost endless variations. This thesis describes the implementation of an algorithmic oracle that can successfully solve games from 3 different previously published datasets of TextWorld games, and its use as a source of training data for experiments testing the ability of a machine­learning model based on GPT­2 to learn to to do the same. Some promising initial results are obtained, suggesting that the GPT­2 architecture can learn to imitate the behavior of the oracle to at least some extent. Differences between the success rate of the trained model on two different datasets of test games raise some interesting questions about what factors might contribute to its success or failure to generalize to previously unseen game environments, and suggest some interesting directions for follow up experiments

Development of new methods of optimizing technological process of producing fabrics on looms

Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Woven Structures from Natural Fibres for Reinforcing Composites

The increase of production of woven structures from natural fibres for reinforced composites can be noticed in different sectors of economy. This can be explained by limited sources of raw materials and different environmental issues, as well as European Union guidelines for car manufacture [4]. This research produced 2D textile structures of hemp yarn and polypropylene yarn and tested the impact of added glass fibre yarn on the mechanical properties of the woven structures and the composites produced from them. The woven structures were manufactured using hand looms or industrial looms (CТБ-175) using one layer technique. The mechanical testing of the reinforcements showed that the parameters of the looms had significant impact on the properties of the reinforcements. However, the desired improvement of strength by adding glass fibre to the fabric was not achieved. The one, two, three and four layer composites were produced in a hydraulic press using reinforcements woven from hemp yarn and polypropylene yarn. The mechanical testing of composites showed that the tensile strength of the composites and the tensile stress at maximum load depends on number of the reinforcement layers, but the tensile extension of the composites and the modulus of elasticity are not closely related to the number of reinforcement layers, but rather on elasticity of yarn used in weaving. Swelling of composites in water was detected

Woven Structures from Natural Fibres for Reinforcing Composites

The increase of production of woven structures from natural fibres for reinforced composites can be noticed in different sectors of economy. This can be explained by limited sources of raw materials and different environmental issues, as well as European Union guidelines for car manufacture [4]. This research produced 2D textile structures of hemp yarn and polypropylene yarn and tested the impact of added glass fibre yarn on the mechanical properties of the woven structures and the composites produced from them. The woven structures were manufactured using hand looms or industrial looms (CТБ-175) using one layer technique. The mechanical testing of the reinforcements showed that the parameters of the looms had significant impact on the properties of the reinforcements. However, the desired improvement of strength by adding glass fibre to the fabric was not achieved. The one, two, three and four layer composites were produced in a hydraulic press using reinforcements woven from hemp yarn and polypropylene yarn. The mechanical testing of composites showed that the tensile strength of the composites and the tensile stress at maximum load depends on number of the reinforcement layers, but the tensile extension of the composites and the modulus of elasticity are not closely related to the number of reinforcement layers, but rather on elasticity of yarn used in weaving. Swelling of composites in water was detected