Bibliographies thématiques / Artificial Seed Deterioration Technology

Littérature scientifique sur le sujet « Artificial Seed Deterioration Technology »

Auteur : Grafiati

Publié le 18 mai 2024

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Articles de revues sur le sujet "Artificial Seed Deterioration Technology"

ȘOPTEREAN, Laura, Loredana SUCIU, Voichita HAÈ˜, Ioan HAÈ˜ et Carmen PUIA. « The Influence Of Fusarium Ear Infection On The Maize Yield And Quality In Some Maize Hybrids Created At ARDS Turda ». Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture 71, n^o 1 (29 mai 2014) : 105–7. http://dx.doi.org/10.15835/buasvmcn-agr:9631.

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Abstract. Maize is a host plant for a large number of pathogens, over 50, that invade all of the plant organs from the moment of germination to the moment of harvesting, and cobs and seeds infections continue most of the times during crops storage. Pathogen agents contributes to deterioration and decrease quantity and quality of yield contributes to productions decreasing, both quantitative and qualitatively, with an average percentage of 20 - 25% in our country. The most damaging in quantitative and qualitative point of view are diseases caused by genus Fusarium spp.. The objectives of this paper are determining the productivity and the quality of corn hybrids created at ARDS Turda, in natural and artificial infection with Fusarium spp, and identification of resistant hybrids to Fusarium spp attack. In 2011-2012 the hybrids were tested in natural and artificial infection conditions. The inoculation was made on each cob using 4 ml of suspension. Following research we can assert the following conclusions: in terms of natural infections in both 2011 and 2012 the most productive hybrids were Turda Favorit (10.74 t / ha, 9.87 t / ha) and Turda Star (10.72 t / ha 8.78 t / ha). Yields hybrids in the study decreased by 0.3 t / ha - 1.4 t / ha under artificial infection. Artificial infections produce changes in biochemical composition of the grain. Hybrids analyzed starch content and oil are lower and protein percentage increased after artificial inoculation.

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ȘOPTEREAN, Laura, Loredana SUCIU, Voichița HAȘ, Ioan HAȘ et Carmen PUIA. « The Influence of Fusarium Ear Infection on the Maize Yield And Quality in Some Maize Hybrids Created at ARDS Turda ». Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture 70, n^o 2 (26 novembre 2013) : 465–66. http://dx.doi.org/10.15835/buasvmcn-agr:9822.

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Maize is a host plant for a large number of pathogens, over 50, that invade all of the plant organs from the moment of germination to the moment of harvesting, and cobs and seeds infections continue most of the times during crops storage. Pathogen agents contributes to deterioration and decrease quantity and quality of yield contributes to productions decreasing, both quantitative and qualitatively, with an average percentage of 20 - 25% in our country. The most damaging in quantitative and qualitative point of view are diseases caused by genus Fusarium spp.. The objectives of this paper are determining the productivity and the quality of corn hybrids created at ARDS Turda, in natural and artificial infection with Fusarium spp, and identification of resistant hybrids to Fusarium spp attack. In 2011-2012 the hybrids were tested in natural and artificial infection conditions. The inoculation was made on each cob using 4 ml of suspension. Following research we can assert the following conclusions: in terms of natural infections in both 2011 and 2012 the most productive hybrids were Turda Favorit (10.74 t/ha, 9.87 t/ha) and Turda Star (10.72 t/ha 8.78 t/ha). Yields hybrids in the study decreased by 0.3 t/ha - 1.4 t/ha under artificial infection. Artificial infections produce changes in biochemical composition of the grain. Hybrids analyzed starch content and oil are lower and protein percentage increased after artificial inoculation.

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Korottseva, I. B. « The opposite arrangement of the leaves of the cucumber ». Vegetable crops of Russia, n^o 2 (3 mai 2022) : 5–9. http://dx.doi.org/10.18619/2072-9146-2022-2-5-9.

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Actuality. The opposite arrangement of the first two leaves in cucumber seedlings can be attributed to undesirable morphoses. The task was set: "To find out how often this sign occurs in cucumber seedlings and whether it is transmitted in the next generations during seed propagation."Material and conditions. The research was carried out on the cucumber breeding material of the laboratory of selection and seed production of pumpkin crops (100-142 samples) on the basis of the Federal Scientific Vegetable Center in 2019-2021 in the Moscow region in the conditions of the seedling department of the winter greenhouse. Sowing of cucumber seeds for seedlings was carried out on January 10-13, March 15 and May 5. Seedlings were grown on racks in plastic pots with a 0.7 l peat mixture in accordance with the generally accepted cultivation technology. In winter – with additional illumination, in spring – without artificial illumination.Results. From year to year, almost the same selection samples of cucumber had plants with the opposite arrangement of the first real leaves. These samples differed significantly in the number of plants with an unconventional arrangement of the first true leaves, but there were differences, sometimes very strong, between families of the same origin. All this suggests that the trait is genetically determined. When sowing cucumber seeds for seedlings on January 10-13, depending on the year of research and the genotype of the material used, from 18.3 to 25.6% of samples were identified that had plants with the opposite arrangement of the first and second true leaves. In seedlings for a spring heated greenhouse (sowing on March 15), there were about 15% of such samples, and 11.0% for non-heated ones (sowing on May 5). In general, the total number of plants with the opposite arrangement of real leaves in the first node was small and varied, depending on the growing conditions and the genotype of the studied samples, from 4.2 to 11.5% of the total number of studied plants. When sowing cucumber seeds at the same time, in the winter of 2019, compared to 2020 and 2021, there were 2.4 and 1.5 times more plants with the opposite arrangement of the first two real leaves. This can be explained by the fact that when planting seedlings, families with a large number of plants with opposite leaves were rejected. Weakened plants with opposite leaves within the family were also rejected. As a result, the material involved in further work had fewer plants with an unconventional arrangement of the first true leaves. It should be noted that plants with opposite leaf arrangement had only those F1 hybrids whose parent forms also differed in this disadvantage. It can be concluded that by selecting parent forms that do not have opposite leaf arrangement, it is possible to create hybrids that will not react sharply to the deterioration of growing conditions by laying opposite leaves.

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Mazitov, N. K., R. L. Sakhapov, Yu Kh Shogenov, L. Z. Sharafiev, Yu S. Tsench et I. R. Rakhimov. « Competitive complex of machinery and technologies for the production of grain and feed ». Agricultural Science Euro-North-East 20, n^o 3 (19 juin 2019) : 299–308. http://dx.doi.org/10.30766/2072-9081.2019.20.3.299-308.

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The current situation in agricultural production is challenging. During the last 2 decades, the agrarian production system has been deteriorating. It concerns crop rotations, moisture accumulation and moisture conservation technologies, ways of increasing soil fertility and growing environmentally friendly grain, reducing production costs and increasing product profitability. But there are forced late sowings and artificial “drought”. All this provides reasons to consider domestic breeding and seed production obsolete and to introduce the foreign analogue, which has planned negative impacts not only on quantitative, but also on qualitative safety. The article provides the solution to this major strategic problem. Under the research program of the Russian Academy of Agricultural Sciences, a highly competitive technology for the production of grain and fodder was developed on the basis of only domestic equipment that 2-5 times predominates over the best foreign analogues in functional indicators. It was confirmed by a number of state tests in 1990-2016 and approved by numerous meetings of the Scientific and Technical Council of the Ministry of Agriculture of the Russian Federation, RAS. The units of domestic tractors and functional machines that can compete with the best foreign counterparts have been developed.

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Eshchenko, V. E., S. V. Karnaukh et A. B. Usik. « Organic system of agriculture and proposals for its implementation ». Collected Works of Uman National University of Horticulture 1, n^o 97 (28 décembre 2020) : 128–36. http://dx.doi.org/10.31395/2415-8240-2020-97-1-128-136.

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Organic system of farming (better called a biological system) is an alternative to the modern intensive systems, according to which the technology of cultivated crops involves the production of environmentally healthy food for the humans and feed for farm animals. To do this, crop products must not contain any harmful chemical residues. Therefore, the use of any artificial chemicals, for example, mineral fertilizers, herbicides, fungicides, insecticides, desiccants, defoliants, etc. is prohibited in its production. The area under the organic system is increasing from year to year and by 2018 they have reached 32.4 million hectares in the world, including 7.4 million hectares in Europe, and the leaders among European countries in the production of organic products are Austria and Switzerland. In 2011, the Verkhovna Rada of Ukraine adopted the Law “On Organic Production”, which defines the legal, economic, social and organizational bases of organic farming. However, the area under such a system in the country so far remains insignificant, and the reason for this is the high potential clogging of our lands, which does not allow the transition to herbicide-free technologies. Below are some techniques that allow you to reduce the clogging of the fields below the threshold of its harmfulness in order to abandon herbicides as a major factor in the deterioration of phytosanitary conditions. Such methods are such a structure of the sown areas, allowing to switch to crop rotation, application of manure without weed seeds, use of improved chills instead of the usual, inclusion in the technology of spring harrowing pre-emergence and their shoots, abandonment of intermediate cultivation for late spring crops instead of spring crops, use spring May.

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Menezes, Vanessa Ocom, Sidinei Jose Lopes, Solange Bosio Tedesco, Fernando Augusto Henning, Humberto Davi Zen et Liliane Marcia Mertz. « Cytogenetic analysis of wheat seeds submitted to artificial aging stress ». Journal of Seed Science 36, n^o 1 (2014) : 71–78. http://dx.doi.org/10.1590/s2317-15372014000100009.

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Several studies have been developed to understand the physiology of seed deterioration, however, the initial steps of the deterioration process are not completely clear. Seed vigor and viability losses are also associated with genetic material damage. This study was carried out to detect cytogenetic and physiological alterations occurring during the deterioration process of wheat seeds, due to artificial aging stress. Two cultivars, Ônix and Fundacep Campo Real, were submitted to six different treatments: control (T1), 24 (T2), 48 (T3), 72 (T4), 96 (T5) and 120 (T6) hours under artificial aging conditions: 42 °C and 100% relative humidity. Germination and vigor tests (First Count of Germination, Electrical Conductivity, Seedling Emergence in the Field and Emergence Speed Index) were performed. Cytogenetic evaluations were performed through smear technique for root tips, stained with 2% acetic orcein. Total number of cells under division and mitotic index (MI) were determined. According to results, vigor and mitotic index were affected due to deterioration process induced by artificial aging stress. A reduced number of dividing cells were observed in seeds submitted to prolonged period of aging. Chromosomal abnormalities in mitotic cells of aged seeds were detected with the occurrence of micronuclei, chromosome breaks and bridges.

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Li, Bang-Bang, Shuai-Bing Zhang, Yang-Yong Lv, Shan Wei et Yuan-Sen Hu. « Reactive oxygen species-induced protein carbonylation promotes deterioration of physiological activity of wheat seeds ». PLOS ONE 17, n^o 3 (31 mars 2022) : e0263553. http://dx.doi.org/10.1371/journal.pone.0263553.

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During the seed aging process, reactive oxygen species (ROS) can induce the carbonylation of proteins, which changes their functional properties and affects seed vigor. However, the impact and regulatory mechanisms of protein carbonylation on wheat seed vigor are still unclear. In this study, we investigated the changes in wheat seed vigor, carbonyl protein content, ROS content and embryo cell structure during an artificial aging process, and we analyzed the correlation between protein carbonylation and seed vigor. During the artificial wheat-seed aging process, the activity levels of antioxidant enzymes and the contents of non-enzyme antioxidants decreased, leading to the accumulation of ROS and an increase in the carbonyl protein content, which ultimately led to a decrease in seed vigor, and there was a significant negative correlation between seed vigor and carbonyl protein content. Moreover, transmission electron microscopy showed that the contents of protein bodies in the embryo cells decreased remarkably. We postulate that during the wheat seed aging process, an imbalance in ROS production and elimination in embryo cells leads to the carbonylation of proteins, which plays a negative role in wheat seed vigor.

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Chaudhuri, Madhurima. « Artificial seed technology : A brief review ». International Journal of Chemical Studies 8, n^o 6 (1 novembre 2020) : 1884–88. http://dx.doi.org/10.22271/chemi.2020.v8.i6aa.11041.

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Magomedov, Islam Arbievich, Timur Gadzhievich Aygumov et Natalya Ivanovna Pikuleva. « Possibilities of deterioration of artificial intelligence ». E3S Web of Conferences 451 (2023) : 06012. http://dx.doi.org/10.1051/e3sconf/202345106012.

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The following article covers the modern technology that changed the known world for the humans dramatically. Its influence is only increasing and its adaption rate by industries is moving parallel. This technology might provide some solid results and transformation in one field and might have negative influence on the other parts. Therefore, this article will be aimed to illustrate what is AI technology and its common application and therefore its impact on them. This article also covers future perspectives of the technology.

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Gutiérrez, Germán, Felipe Cruz, Juan Moreno, Victor A. González-Hernández et Jorge M. Vázquez-Ramos. « Natural and artificial seed ageing in maize : germination and DNA synthesis ». Seed Science Research 3, n^o 4 (décembre 1993) : 279–85. http://dx.doi.org/10.1017/s0960258500001896.

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AbstractThe effect of natural and artificial seed ageing has been compared in terms of physiological and biochemical responses of several maize genotypes. The physiological parameters were: viability, germinability, emergence in sand and dry matter accumulation. The biochemical parameters were: DNA synthesis and DNA polymerase activity. A close and direct relationship was found between seed deterioration and DNA metabolism in all maize materials which responded to ageing according to their genetic constitution; i.e., vigorous genotypes suffered less severe damage or recovery was faster than in the low-vigour genotypes. Coordination of events at appropriate times would seem a critical factor for proper seed germination.

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Thèses sur le sujet "Artificial Seed Deterioration Technology"

Tamang, Deepa. « Enhancement of seed vigour and viability of aromatic rice by using chemicals under climatic conditions of Darjeeling Hills ». Thesis, University of North Bengal, 2022. http://ir.nbu.ac.in/handle/123456789/4810.

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Livres sur le sujet "Artificial Seed Deterioration Technology"

Simulation Method of Multipactor and Its Application in Satellite Microwave Components. Taylor & Francis Group, 2021.

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Yang, Jing, Yun Li, Wanzhao Cui et Hongtai Zhang. Simulation Method of Multipactor and Its Application in Satellite Microwave Components. Taylor & Francis Group, 2021.

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Chapitres de livres sur le sujet "Artificial Seed Deterioration Technology"

Ranganathan, Umarani, et Steven P. C. Groot. « Seed Longevity and Deterioration ». Dans Seed Science and Technology, 91–108. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5888-5_5.

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AbstractThe fundamental deteriorative processes that lead to loss of seed viability contrastingly vary between desiccation insensitive (orthodox) and desiccation sensitive seeds (recalcitrant). Orthodox seeds which undergo maturation drying are bestowed with protective mechanisms which guard the seeds against deterioration. They include the accumulation of antioxidants, non-reducing sugars, protective proteins such as late embryogenesis abundant proteins, heat-shock proteins, lipocalins, hormones and chemical protectants (raffinose family oligosaccharides, flavonoids, lignins, vitamin E). The nuclear DNA is packed denser and chlorophyll is degraded. Besides, the cytoplasm is capable of transitioning between liquid and glassy state depending on the moisture content of the seeds aiding in the maintenance of seed viability potential. In the dry seeds, the glassy state of the cytoplasm ensures the stabilization of cellular components by arresting cell metabolism. However, even with low moisture content and a glassy state of cytoplasm, reactive oxygen species generated due to the presence of oxygen in the storage atmosphere may cause the ageing of seed. As the seed moisture content increases, mitochondrial respiration gets activated, also leading to increased production of reactive oxygen species, owing to inefficient mitochondrial activity. The reactive oxygen species lead to the oxidation of essential molecules such as DNA, RNA, proteins and lipids. Further, mitochondrial membranes also get oxidized, leading to reduced aerobic respiration potential. When the damage is not substantial, orthodox seeds are capable of repairing the molecular damages that accumulate during storage, enabling the seeds to partially overcome the damages and extend their longevity. This includes activation of repair of cell membranes, DNA, RNA, proteins and mitochondria as the seeds imbibe water.Unlike the orthodox seeds, the recalcitrant seeds are largely devoid of protective mechanisms which guard the seeds against rapid deterioration. The recalcitrant seeds are shed from the mother tree at high moisture content while they are metabolically active. After dispersal, the seeds undergo deteriorative changes during drying due to the damage to the cytoskeleton (physical damage), besides reactive oxygen species-induced damage due to lack of antioxidant activity (metabolism-induced damage). Even when maintained under high moisture content, seeds exhibit dysfunction of the cell organelles and extensive vacuolization predisposing the seeds to deterioration. Thus, recalcitrant seeds are prone to deterioration either under low or high moisture content.

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Copeland, Larry O., et Miller B. McDonald. « Seed Longevity and Deterioration ». Dans Principles of Seed Science and Technology, 181–220. Boston, MA : Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-1783-2_8.

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Copeland, Lawrence O., et Miller B. McDonald. « Seed Storage and Deterioration ». Dans Principles of Seed Science and Technology, 192–230. Boston, MA : Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1619-4_9.

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Siraree, Archana. « Artificial Seed Technology ». Dans Sugar Beet Cultivation, Management and Processing, 131–42. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2730-0_8.

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Dadlani, Malavika, Anuja Gupta, S. N. Sinha et Raghavendra Kavali. « Seed Storage and Packaging ». Dans Seed Science and Technology, 239–66. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5888-5_11.

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AbstractStorage is an essential component of seed programmes, which primarily aims at maintaining the high-quality standards of the seed from harvest till the time of sowing the crop in the next or successive seasons. In addition to this, seeds are also stored for longer durations to maintain stocks for seed trade at national and international levels as per market demands and as a buffer against crop failures in times of natural calamities or other exigencies, to maintain seeds of the parental lines for hybrid seed production in one or more seasons, to conserve active genetic stocks for breeding purposes, and to maintain germplasm for long term use. Seeds of most of the agriculturally important species are categorised as orthodox or desiccation-tolerant. Their longevity increases with decrease in storage temperature and the relative humidity of the storage environment (or seed moisture content). However, notwithstanding the constitutional differences among plant species concerning seed longevity, being a living entity, every seed undergoes deteriorative changes during storage, even in dry stores, primarily in terms of germination and vigour due to physiological deterioration, and changes brought by the presence of the pests and pathogens. A good seed programme aims at maintaining the high planting value of the seed in terms of purity, germination, vigour, and seed health during storage by taking care in seed handling, controlling the temperature and relative humidity of the store (or seed moisture in case of hermetically sealed containers), and following good sanitation practices. Considering that the facilities for conditioned storage may not be accessible and affordable in many situations, alternative solutions may be considered, especially for on-farm seed storage.

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Sharma, Monika, Prasann Kumar et Padmanabh Dwivedi. « Artificial Seed Production and Cryopreservation Technology for Conservation of Plant Germplasm with Special Reference to Medicinal Plants ». Dans Sustainable Development and Biodiversity, 581–93. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9936-9_21.

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Sanmartín, Patricia. « New Perspectives Against Biodeterioration Through Public Lighting ». Dans Microorganisms in the Deterioration and Preservation of Cultural Heritage, 155–71. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69411-1_7.

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AbstractThere is currently an increasing trend in urban centres towards the use of public outdoor lighting systems to illuminate historic and architecturally important buildings during evening hours, but for which there is no specific regulatory framework. Considering that the light is a key factor involved in regulating growth and physiological processes in photosynthetic organisms, it seems appropriate to address the effects that artificial light has on the organisms growing on the facades affected by public lighting. In this sense, despite scientific research in the fields of biological colonization of buildings surfaces and light technology has advanced greatly in recent years, the combination of both disciplines aimed at the correct handling of city public lighting remains uncharted territory with huge potential to provide innovative solutions for smart cities. Recent studies have examined how urban monuments are affected by night-time outdoor illumination in combination with natural sunlight and demonstrated that the use of suitable lighting can inhibit the development of biological colonization. In this frame, this chapter will look at ways of contribute to the long-term management of public illumination on monuments and other structures, while reducing negative impacts caused by night lighting.

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McKersie, Bryan D. « Somatic Embryogenesis in Alfalfa : A Model for the Development of Dry Artificial Seed Technology ». Dans Seed Development and Germination, 833–46. Routledge, 2017. http://dx.doi.org/10.1201/9780203740071-31.

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Das, Rupa, et Saikat Biswas. « Influence of Abiotic Stresses on Seed Production and Quality ». Dans Seed Biology Updates [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106045.

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Climate change is exerting detrimental impacts on agriculture through various biotic and abiotic stresses. Abiotic stresses such as drought, flood, temperature extremes, salinity, chemicals, heavy metals, nutrient scarcity/toxicity, wind and light in combination more adversely affect the seed production and quality by hampering plant’s morphological, physiological, cellular, biochemical and molecular activities than alone, resulting in poor production of high-quality seeds. Deterioration of yield and quality arises also under abiotic stresses. Under abiotic stresses, plant activates its own defensive mechanisms by escaping, avoiding and tolerating stresses. Some of the plant’s defensive mechanisms include plant’s morphological, cellular, physiological, biochemical and molecular changes to adapt the stresses, synthesis of compounds such as ABA, proline, polyamines increasing the activities of ROS quenchers, expression of stress-resisting genes and activation of enzymes. Further, exogenous application of phytohormones, stress-alleviating compounds, modification of agronomic management, modern breeding strategies such as development of resistant varieties can also help to cope up with stresses and produce quality seeds. Financial and policy support of government or NGOs regarding development of infrastructure, research technologies and thereby, multi-locational trials as well as technology transfusion through extension activities are needed to curtail down the devastating impact of abiotic stresses on quality seed production.

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Yahia, Elhadi M. « Advances in postharvest physiology, technology and handling of fresh avocado ». Dans Sustainable production and postharvest handling of avocado, 205–56. Burleigh Dodds Science Publishing, 2023. http://dx.doi.org/10.19103/as.2023.0144.05.

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Optimal postharvest handling of avocado fruit is essential for the preservation of quality and prolonging postharvest life. Avocados are climacteric fruit and one of the very few fruits that do not fully ripen on the tree, but only after harvest. This chapter describes the most important physiological and biochemical characteristics and changes of the fruit that lead to and affect maturation and ripening, necessitating appropriate handling after harvest. Some important potential causes of fruit deterioration after harvest, such as physiological changes and disorders, diseases and insects are highlighted. The most important maturity and harvesting indices, especially the oil and dry matter contents, are detailed as well as acceptable harvesting methods. In addition, all postharvest handling techniques, such as packing, packaging, grading and classification, cooling, storage, transport, use of modified and controlled atmospheres, artificial ripening and ripening control are discussed in detail.

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Actes de conférences sur le sujet "Artificial Seed Deterioration Technology"

Pettigrew, James L. « Field Experience Versus Theory in Turbine Engine Deterioration ». Dans ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-161.

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This paper describes observations and analysis of data recorded on operating helicopter engines using advanced technology data recording systems. The US Army began the test on TS3 engines in 1986 and expanded it to their T55, T63, T700, and T703 helicopter engines in 1990. These engines have a gas generator with a free turbine for power production. A portable instrumentation system is used to do inflight helicopter engine tests and electronically record performance information. A PC based data analysis system uses artificial intelligence to change the data into diagnostic information for the test engine’s capability to perform the missions. The data output presents this information in an easily understandable format that allows the decision maker to see differences in the condition of individual engines and rank them on their relative capability. The resulting data base clearly shows each engine’s on-condition status. Valid knowledge of each engine’s condition is very valuable as the basis for decisions that direct the limited resources to the least capable engines. Rejection criteria for installed engine deterioration does not fully agree with observed operational behavior. Observations that are different are: (1) a deteriorated engine’s gas generator slows down when running at rated power yet no minimum speed limit exists and (2) a deteriorated engine operates at a lower SFC than a newly overhauled one yet no minimum limit exists, instead, both conditions are considered indications of better engines.

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Spath, William E., et Wayne W. Walter. « Feasibility of Integrating Multiple Types of Electroactive Polymers to Develop an Artificial Human Muscle ». Dans ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37321.

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Electroactive polymers (EAPs) have been labeled as the future stakeholder for artificial muscle technology and machine actuation. The US Armed Forces have seen an increased population of service members suffering from loss of limbs as a result of conflicts overseas. Civilian populations have suffered as well, due to muscle tissue deterioration brought on by injury or disease. Many prosthetic limbs have been engineered with rotary actuation, but do not mimic fluid motion as human muscles do. Through the research of biomimetics, imitating nature and applying those techniques to technology, electroactive polymers have been found to produce the fluid-like characteristics of biological muscles as needed for precise artificial simulation. These materials exhibit common traits of biological muscle tissue regarding potential energy storage. When activated by an electrical voltage potential, EAPs can produce characteristics such as: bending/axial strain or changes in viscosity. One classification of electroactive polymers, Ionic EAPs, exhibit bipolar activation under low voltages and can be found in various physical states; solid, liquid, and gel states. These characteristics make Ionic EAPs the most attractive materials to be used in low energy or mobile applications, such as exoskeletons and implants. For high strain and large load applications, electronic EAPs can be used. Electronic EAPs require high voltages which induces high rates of strain and large deformations. To date, it appears that various types of EAP materials are being used individually, as opposed to integrated with other types. Biological muscles are made of many different proteins organized in an optimized geometrical structure which yields a more efficient response combined than achieved individually. The focus of the current project is to integrate multiple EAP materials in a designed mechanical system to produce a closer representation of a biological muscle. The status of this RIT project; to design, fabricate, and test an integrated EAP-based artificial muscle will be discussed along with the conceptual thinking for design obtained to date.

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Wuttipittayamongkol, Weeraya, Pannapon Trinavarat, Warisa Nuntaprayoon, Monrawee Pancharoen et Rapheephan Laochamroonvorapongse. « Design and Execution of the First Large-Scale Polymer Injection Pilot in Sirikit Oil Field ». Dans International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21475-ms.

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Abstract Becoming more mature with field-wide water flooding implementation for more than 30 years, Sirikit Oil Field (S1) is going forward to the next rejuvenating step of enhanced oil recovery (EOR). Generally, the field contains light oil (40° API) in highly stratified sand-shale sequences with low net-to-gross ratios. High reservoir temperature, low permeability, and high water cut observed from production make it even more challenging for polymer injection projects. Nonetheless, the success from a small-scale field trial has shown a promising future of EOR application in the field and brought an execution of the first large-scale polymer injection pilot. Polymer screening laboratory tests, a reservoir simulation study, data acquisition program and techniques, injectivity tests, polymer injection unit design, and risk assessment were parts of the pilot preparation, in which the key learnings from the previous pilot have been incorporated. The gathering and determination of baseline parameters including production performance, injection profiles, reservoir fluid saturation profiles, etc., were registered for ultimate evaluation. Then, the continuous polymer injection has been started since October 2019 in two separated fault blocks where 12 injectors and 20 producers are located in different injection patterns. During several months of polymer injection, both foreseen and unforeseen changes have enlivened the pilot management. Although the injectivity test with polymer solution prior to the pilot demonstrated no injection difficulty, several wells have shown injectivity deterioration with time. Mechanical degradation is induced in these wells by the installation of flow restriction devices to lessen solution viscosity and, hence, prolong polymer injectivity. Well integrity issues and artificial lift breakdown negatively affect field production and close-in wells make it harder for voidage replacement control. Immediate troubleshooting and close monitoring have been placed and eventually leads to the recognition of encouraging results. Polymer helps improve vertical injection profiles as seen from injection logging. Saturation logging presents a sign of oil saturation decrease around the wellbore area. Reduction of water cut and rise of oil production have pleasantly come after a few months from the start. Intensive surveillance program will be continued over the course of pilot injection. The critical success of the EOR pilot execution depends on the detailed planning, prudent surveillance and comprehensive evaluation. Sirikit oil field is moving to a turning point and the pilot outcome would lead the way to a further milestone, so as to avoid premature end of the field's production.

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Zhang, Yanyan, Xiaodong Cai, Qing Ye et Yun Xue. « Seed node selection algorithm based on augmented graph embedding ». Dans 2023 IEEE 11th Joint International Information Technology and Artificial Intelligence Conference (ITAIC). IEEE, 2023. http://dx.doi.org/10.1109/itaic58329.2023.10408757.

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Kozlova, I. V. « USE OF ARTIFICIAL CLIMATE CHAMBER TO REDUCE THE PERIOD OF TOMATO HYBRID Development ». Dans «Breeding, seed production, cultivation technology and processing of agricultural crops». Federal State Budgetary Scientific Institution Federal Scientific Rice Centre, 2021. http://dx.doi.org/10.33775/conf-2021-220-223.

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Wang, Qiu, et Bingyong Tang. « Innovation on the operating mode of China seed industry E-commerce website ». Dans 2011 6th IEEE Joint International Information Technology and Artificial Intelligence Conference (ITAIC). IEEE, 2011. http://dx.doi.org/10.1109/itaic.2011.6030250.

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Abdelrahman, Sherif, Mohamed Al-Ajmi et Tarek Essam. « Autonomous Well Performance Troubleshooting ; A Promising Data-Driven Application ». Dans International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22398-ms.

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Abstract Well Performance can deteriorate due to several reasons, for example: formation damage, scale buildup, back pressure from other wells, artificial lift issue etc. In this paper we present an application of utilizing machine learning to build a model to articulate and flag deterioration and reason behind it. The model was used to flag problems such as salt and scale build up in the tubing as well as backpressure due to emulsions in the tubing or in topside pipes. The model was capable of monitoring well performance using only the well head parameters

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Konstantinovich, A. V., A. S. Kuracheva et E. D. Binkevich. « Improvement of separate elements of the techno-logy of cultivation of white cabbage in the conditions of the of the central region of the non-chernozem zone ». Dans Растениеводство и луговодство. Тимирязевская сельскохозяйственная академия, 2020. http://dx.doi.org/10.26897/978-5-9675-1762-4-2020-145.

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In conditions of climate change, when temperature and precipitation fluctuations occur more and more frequently during the growing season, it is necessary to obtain high quality seedlings with "immunity" to various stress factors, including high weediness, the damage from which is associated with a decrease in yield (by 25 -35%) and with a deterioration in the quality of agricultural products. Due to the imbalance in production technology, seedlings are often weakened, overgrown, with a low yield per unit area and survival rate in the field. One of the solutions to this problem is the use of PP for pre-sowing seed treatment to increase the competitiveness of seedlings in the field.

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Park, Nameun, Jik Kim, Sang Lee, Cheol Woo, Hyung Kim et Yoo Hwang. « A Research on the Icing Flight Test and Computational Simulation for the Design of Ice Protection System for KUH (Korean Utility Helicopter) ». Dans Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14738.

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Icing of the fuselage and blades may occur when the helicopter is flying in the icing area. If ice accretion occurs in the ADS(Air Data System) of the fuselage, normal speed and altitude information are lost, making it difficult to flight. When windshield icing occurs, the view of pilot is limited and flight is difficult. Also, the ice accretion of the blades deforms the outer shape of the blades (Ref. 1) and makes the dynamic characteristics unstable due to an abnormal weight increase, resulting in deterioration of performance, deterioration of maneuverability, and structural instability. To avoid this, an anti-icing or de-icing system is required. Therefore, if the aircraft is not fitted with a proper anti-icing system, it is not possible to operate under icing conditions. However, it is difficult to design a proper anti-icing system considering the position of anti-icing protection area and icing phenomenon due to limitation of electric power, weight, thermal damage temperature limit, shape and so on. It is essential of understanding of anti-icing mechanism for selection and design of appropriate anti-ice system considering configuration (impingement limit, collection efficiency), material (thermal fatigue limit, heating source) and icing amount (collection efficiency, stagnation point). This paper introduces the preparation procedure (analysis & simulation, design, scaled model test) of icing certification test and the artificial/natural icing flight test method for proving helicopter icing through KUH case, and describes the characteristics of each system for the de/anti-icing system design of the helicopter, the computational analysis method, comparison with the test result, and the improvement method of the de/anti-icing system.

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Al Harty, N., E. Rassuli, H. Al Lawati, A. Aslanyan, D. N. Gulyaev et A. N. Nikonorova. « Assessing the Heavy Oil Waterflood Efficiency through Integrated Crosswell Testing and Advanced Production Analysis ». Dans International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23218-ms.

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Abstract The paper presents a study of a heavy oil mature field in Oman with aggressive water cut growth and slightly exceeding the ultimate recovery as per the initial Master Development Plan expectations. The reserves have been naturally depleted for more than a decade before trying out the waterflood a few years back. The first results of the waterflood were not consistent due to high cross-well interference from one side and possible compartmentalization from another. The key objective of the current study was to assess the on-going waterflood efficiency, cross-well interference, possible production complications and assess possibility of improving further recovery. The key instrument of the cross-well interference analysis was based on multiwell deconvolution of the permanent downhole pressure gauges in response to the historical flow rate variations in offset wells. The water cut diagnostics was based on the large number of well-by-well metrics including recovery micro-modelling baselines, multiphase IPR analysis and multiphase productivity analysis. The mobile reserves’ potential was assessed through material balance, fractional flow analysis and decline curve analysis. Both watercut diagnostics and reserves evaluation have been facilitated by a digital assistant with a fully automated generator of numerous diagnostic metrics which otherwise would take an unrealistically long time to perform such a study. The study has come to the conclusion that all wells are fairly connected but confirmed the deterioration of connectivity between a few wells. The water injectors have confirmed a fair connectivity with all surrounding producers while the aquifer was found to be much weaker than the effect from water injection in these wells. The study suggests that this field still contains commercial volumes of hydrocarbon reserves which can be economically recovered, preferably via horizontal side-tracks from existing wells. It has been recommended to repressurize two main reservoir units independently. The study has spotted a few suspects of thief water production and recommended reservoir-orientated production logging to locate the water source, which was most probably occurring behind the casing. These wells have been recommended as primary candidates for side-tracking. The current study was extensively using a combination of bottomhole pressure deconvolution and advanced watercut diagnostics for heavy oil production to provide a holistic analysis of the remaining reserves. The study also provides the comparison of the results of pressure forecast between multiwell deconvolution technique (MDCV), artificial neural network (ANN) and capacitance-resistivity model (CRM).

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