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Artykuły w czasopismach na temat „Ethylene Systems”

Autor: Grafiati
Data publikacji: 6 września 2023
Data aktualizacji: 19 lipca 2025

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1

Kamala Aliyeva, Rashid Jafarov, Kamala Aliyeva, Rashid Jafarov. "SAFETY CONTROL SYSTEMS FOR ETHYLENE PRODUCTION." PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 35, no. 12 (2023): 206–13. http://dx.doi.org/10.36962/pahtei35122023-206.

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Ethylene production is a cornerstone of the petrochemical industry, with a global demand that continues to rise. Ensuring efficient, safe, and environmentally responsible ethylene production processes is paramount. Ethylene production control systems, encompassing a range of technologies and strategies, play a pivotal role in achieving these objectives. This abstract provides a concise overview of key aspects of ethylene production control systems, their challenges, and their critical importance. Ethylene production control systems serve as the backbone of modern ethylene plants, orchestrating complex operations to meet production targets while maintaining product quality. These systems integrate advanced technologies such as distributed control systems (DCS), safety instrumented systems (SIS), and process optimization tools to manage variables like temperature, pressure, flow rates, and feedstock composition. Efficiency and yield optimization are central objectives in ethylene production control. Control strategies are designed to maximize product output while minimizing energy consumption and raw material wastage. Additionally, safety control systems are a crucial component, mitigating risks associated with the highly flammable nature of ethylene and ensuring the well-being of personnel and environmental protection. Challenges in ethylene production control systems include managing the variability in feedstock quality, adapting to changing market demands, and adhering to stringent environmental regulations. As feedstock composition can fluctuate, control systems must continually adjust to maintain product quality and consistency. The emergence of Artificial Intelligence (AI) has brought new dimensions to ethylene production control. AI-driven predictive maintenance, anomaly detection, and process optimization are being explored to enhance operational efficiency and reduce downtime. In summary, ethylene production control systems are pivotal in sustaining the global supply of ethylene, a vital chemical compound. Their roles extend beyond production to safety and environmental compliance, making them indispensable components in the petrochemical industry's pursuit of efficiency and sustainability. To meet growing demands and address evolving challenges, the integration of advanced technologies, such as AI, holds promise for the future of ethylene production control systems. A strong safety culture is the backbone of safety control in ethylene production. This involves fostering a work environment where safety is paramount, and all personnel are equipped with the knowledge, awareness, and commitment to safety objectives. Clear communication and continuous training ensure that safety becomes an integral part of the organizational DNA. These systems represent a synergy of hardware, software, and operational protocols meticulously designed to monitor, detect, and respond to anomalous conditions, with a primary objective of averting incidents that could culminate in equipment damage, environmental harm, or harm to personnel. Keywords: Ethylene Production, Control Systems, Petrochemical Industry, Efficiency, Safety, Environmental Responsibility.
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2

Gubrium, E. K., D. G. Clark, H. J. Klee, T. A. Nell, and J. E. Barrett. "Analysis of Horticultural Performance of Ethylene-insensitive Petunias and Tomatoes." HortScience 32, no. 3 (1997): 499D—499. http://dx.doi.org/10.21273/hortsci.32.3.499d.

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We are studying the horticultural performance of two model plant systems that carry a mutant gene that confers ethylene-insensitivity: Never Ripe tomatoes and petunia plants transformed with the mutant etr1-1 gene isolated from Arabidopsis thaliana. Having two model systems to compare side-by-side allows us to determine with greater certainty ethylene's role at different developmental stages. Presence of the mutant etr1-1 gene in transgenic petunias was determined using three techniques: PCR analysis, the seedling triple response assay (inhibition of stem elongation, radial swelling of stem and roots, and an exaggerated apical hook when grown in the dark and in the presence of ethylene), and the flower wilting response to pollination, which is known to be induced by ethylene. Flowers from ethylene-insensitive petunias took almost four times as long to wilt after pollination as wild-type plants. It is well known that fruit ripening in Never Ripe tomato is inhibited, and a similar delayed fruit ripening phenotype is observed in petunia plants transformed with etr1-1. In an effort to maintain ethylene-insensitive petunia plants by vegetative propagation, we observed that the rate of adventitious root formation was much lower with transgenic plants than in wild-type plants. In subsequent experiments on adventitious root formation in Never Ripe tomato, we observed the same result. Therefore, while ethylene-insensitive tomato and petunia plants appear phenotypically normal for many characters, other factors are altered by the presence of this mutation. The fact that these changes are present in two model systems helps to define the role of ethylene perception in plant growth and reproduction.
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3

Zemlyanskaya, Elena V., Nadya A. Omelyanchuk, Elena V. Ubogoeva, and Victoria V. Mironova. "Deciphering Auxin-Ethylene Crosstalk at a Systems Level." International Journal of Molecular Sciences 19, no. 12 (2018): 4060. http://dx.doi.org/10.3390/ijms19124060.

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The auxin and ethylene pathways cooperatively regulate a variety of developmental processes in plants. Growth responses to ethylene are largely dependent on auxin, the key regulator of plant morphogenesis. Auxin, in turn, is capable of inducing ethylene biosynthesis and signaling, making the interaction of these hormones reciprocal. Recent studies discovered a number of molecular events underlying auxin-ethylene crosstalk. In this review, we summarize the results of fine-scale and large-scale experiments on the interactions between the auxin and ethylene pathways in Arabidopsis. We integrate knowledge on molecular crosstalk events, their tissue specificity, and associated phenotypic responses to decipher the crosstalk mechanisms at a systems level. We also discuss the prospects of applying systems biology approaches to study the mechanisms of crosstalk between plant hormones.
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4

Samuel, T., and G. S. Laddha. "The ternary systems with ethylene glycol." Journal of Applied Chemistry 9, no. 4 (2007): 246–48. http://dx.doi.org/10.1002/jctb.5010090409.

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5

Soares, Caroline Giacomelli, Samira Bernardino Ramos do Prado, Sónia C. S. Andrade, and João Paulo Fabi. "Systems Biology Applied to the Study of Papaya Fruit Ripening: The Influence of Ethylene on Pulp Softening." Cells 10, no. 9 (2021): 2339. http://dx.doi.org/10.3390/cells10092339.

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Papaya is a fleshy fruit that undergoes fast ethylene-induced modifications. The fruit becomes edible, but the fast pulp softening is the main factor that limits the post-harvest period. Papaya fast pulp softening occurs due to cell wall disassembling coordinated by ethylene triggering that massively expresses pectinases. In this work, RNA-seq analysis of ethylene-treated and non-treated papayas enabled a wide transcriptome overview that indicated the role of ethylene during ripening at the gene expression level. Several families of transcription factors (AP2/ERF, NAC, and MADS-box) were differentially expressed. ACO, ACS, and SAM-Mtase genes were upregulated, indicating a high rate of ethylene biosynthesis after ethylene treatment. The correlation among gene expression and physiological data demonstrated ethylene treatment can indeed simulate ripening, and regulation of changes in fruit color, aroma, and flavor could be attributed to the coordinated expression of several related genes. Especially about pulp firmness, the identification of 157 expressed genes related to cell wall metabolism demonstrated that pulp softening is accomplished by a coordinated action of several different cell wall-related enzymes. The mechanism is different from other commercially important fruits, such as strawberry, tomato, kiwifruit, and apple. The observed behavior of this new transcriptomic data confirms ethylene triggering is the main event that elicits fast pulp softening in papayas.
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6

Kanimoli, S., and K. Kumar. "Studies on nitrogenase activity of diazotrophic isolates from different rice production systems." Journal of Applied and Natural Science 8, no. 1 (2016): 284–89. http://dx.doi.org/10.31018/jans.v8i1.787.

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The present study was carried out to evaluate the nitrogen fixing ability of diazotrophs isolated from the rhizosphere soils of rice which were grown in three different rice growing systems. A total of hundred and ten isolates obtained were subjected to Acetylene Reduction Assay (ARA) and ninety eight isolates recorded significant amount of nitrogenase activity in a range of 185.73 to 3794.55 nmoles of ethylene mg of protein-1 h-1. The highest nitrogenase activity was recorded by Derxia (3794.55 nmoles of ethylene mg of protein-1 h-1) isolated from Trichy (lowland). Among the three different rice production systems, isolates obtained from lowland rice (Derxia – 3794.5 nmoles of ethylene mg of protein-1 h-1) recorded higher nitrogenase activity followed by Aerobic (Pseudomonas - 2194.89 nmoles of ethylene mg of protein-1 h-1) and SRI (Azotobacter - 1971.85 nmoles of ethylene mg of protein-1 h-1) rice isolates. The results revealed marked variation in the ARA of the diazotrophic isolates obtained from lowland, SRI and Aerobic rice. The nitrogenase activity of diazotrophs from rice fields have been reported earlier but the nitrogenase activity of diazotrophs from three different rice production systems from various parts of Tamil Nadu is reported for the first time from India.
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7

Janssen, S., K. Schmitt, M. Blanke, M. L. Bauersfeld, J. Wöllenstein, and W. Lang. "Ethylene detection in fruit supply chains." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2017 (2014): 20130311. http://dx.doi.org/10.1098/rsta.2013.0311.

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Ethylene is a gaseous ripening phytohormone of fruits and plants. Presently, ethylene is primarily measured with stationary equipment in laboratories. Applying in situ measurement at the point of natural ethylene generation has been hampered by the lack of portable units designed to detect ethylene at necessary resolutions of a few parts per billion. Moreover, high humidity inside controlled atmosphere stores or containers complicates the realization of gas sensing systems that are sufficiently sensitive, reliable, robust and cost efficient. In particular, three measurement principles have shown promising potential for fruit supply chains and were used to develop independent mobile devices: non-dispersive infrared spectroscopy, miniaturized gas chromatography and electrochemical measurement. In this paper, the measurement systems for ethylene are compared with regard to the needs in fruit logistics; i.e. sensitivity, selectivity, long-term stability, facilitation of automated measurement and suitability for mobile application. Resolutions of 20–10 ppb can be achieved in mobile applications with state-of-the-art equipment, operating with the three methods described in the following. The prices of these systems are in a range below €10 000.
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8

Hernández, Luis González, Andrés Rodríguez Díaz, and Juan Luis de Benito González. "Different Curing Systems for Ethylene-Propylene Elastomers." Rubber Chemistry and Technology 65, no. 5 (1992): 869–78. http://dx.doi.org/10.5254/1.3538647.

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Abstract The scope of this paper is to review peroxide curing of ethylene-propylene elastomers, where apart from crosslinking, other reactions occur, such as chain scission, which account for the drop in physical properties. The results are compared with an alternative crosslinking system which is being assessed in our laboratory. With the new curing agent the chain-scission reaction is not present and the physical properties of the vulcanizates are improved. The effects of the different crosslinking systems on the reaction transitions are studied with the aid of dynamic mechanical analysis.
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9

Hammouda, B., D. Ho, and S. Kline. "SANS from Poly(ethylene oxide)/Water Systems." Macromolecules 35, no. 22 (2002): 8578–85. http://dx.doi.org/10.1021/ma011657n.

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10

GRAY, F., J. MACCALLUM, and C. VINCENT. "Poly(ethylene oxide) - LiCF3SO3 - polystyrene electrolyte systems." Solid State Ionics 18-19 (January 1986): 282–86. http://dx.doi.org/10.1016/0167-2738(86)90127-x.

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Xiao, Min, and Margaret W. Frey. "Study of cellulose/ethylene diamine/salt systems." Cellulose 16, no. 3 (2009): 381–91. http://dx.doi.org/10.1007/s10570-009-9284-2.

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12

Bogdanov, B., and M. Mihailov. "Melting of water/poly(ethylene oxide) systems." Journal of Polymer Science: Polymer Physics Edition 23, no. 10 (1985): 2149–58. http://dx.doi.org/10.1002/pol.1985.180231011.

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Michiels, Wilfried, and Antonio Muñoz-Escalona. "Mixed cocatalyst systems in metallocene ethylene polymerization." Macromolecular Symposia 97, no. 1 (1995): 171–83. http://dx.doi.org/10.1002/masy.19950970118.

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Britton, Laurence G. "Loss case histories in pressurized ethylene systems." Process Safety Progress 13, no. 3 (1994): 128–38. http://dx.doi.org/10.1002/prs.680130305.

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15

Зубов, М. Г., А. А. Кадревич, А. В. Полякова, and Е. В. Вильсон. "Identification of microorganisms, dominants in treatment systems removing ethylene glycol from wastewater." Vodosnabzhenie i sanitarnaia tehnika, no. 5 (May 15, 2024): 57–63. http://dx.doi.org/10.35776/vst.2024.05.06.

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Представлены результаты исследований по автоселекции биоценоза, окисляющего этиленгликоль. Показано, что формирование деструктирующего этиленгликоль биоценоза без использования специальных штаммов происходит на 12-е сутки, выход на стационарный режим составляет от 40 до 64 суток в зависимости от требуемой концентрации этиленгликоля в очищенной воде. В результате проведенных микробиологических исследований были определены основные деструктирующие этиленгликоль культуры биоценоза: Staphylococcus capitis, Staphylococcus saprophyticus, Pseudomonas putida и Pseudomonas aureofaciens. При этом доминирующими являются культуры рода Pseudomonas. The results of studies on autoselection of biocenosis that oxidizes ethylene glycol are presented. It has been shown that the formation of an ethylene glycol-destructive biocenosis eliminating the use of special strains occurs on the 12th day, reaching process stabilization from 40 to 64 days, depending on the required concentration of ethylene glycol in the effluent. As a result of the microbiological studies, the main ethylene glycol-destructive cultures of the biocenosis were identified: Staphylococcus capitis, Staphylococcus saprophyticus, Pseudomonas putida and Pseudomonas aureofaciens. Herewith, the dominant cultures are the genus Pseudomonas.
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16

de Loos, Th W., W. Poot, and J. de Swaan Arons. "Fluid phase equilibria in the binary systems ethylene + n-triacontane and ethylene + squalane." Fluid Phase Equilibria 29 (October 1986): 505–14. http://dx.doi.org/10.1016/0378-3812(86)85049-x.

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Katla, Venkataramana, Shizhen Du, Carl Redshaw, and Wen-Hua Sun. "Chromium Complex Pre-Catalysts in Ethylene Oligomerization/Polymerization." Review of Catalysts 1, no. 1 (2014): 1–14. http://dx.doi.org/10.18488/journal.96.2014.11.1.14.

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Recent progress of chromium complex pre-catalysts in ethylene oligomerization and polymerization is reviewed herein. As well as the well-established trimerization of ethylene by chromium catalytic systems, such pre-catalysts have more generally been explored for ethylene oligomerization. Furthermore, chromium complex pre-catalysts have been found to exhibit high activity during ethylene polymerization. The catalytic activities can be influenced by the nature of ligands present, which can provide useful knowledge in determining structure-activity relationships. This review provides collective references concerned with the design of complex pre-catalysts with a view to ethylene reactivity.
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18

Babenko, Ilya A., Viktor A. Bezborodov, and Alexey I. Vilms. "CATALYTIC CONVERSION OF ETHYLENE ON SYSTEMS BASED ON THRICHLOROTRIS-(TETRAHYDROFURANATE)CHROMIUM(III) WITH SOS-TYPE LIGANDS IN COMBINATION WITH VARIOUS ORGANOALUMINUM COCATALYSTS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 4 (2021): 85–91. http://dx.doi.org/10.6060/ivkkt.20216404.6333.

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This work presents the results of studying the behavior of catalytic systems formed on the basis of trichlorotris-(tetrahydrofuranate)chromium(III) in the presence of sulfur-containing tridentate SOS-type ligands and activated by various organoaluminum compounds. In the formation of catalytic systems, the following compounds were used: SOS-type ligands - bis-(2-methylthioethyl) ether, bis-(2-ethylthioethyl) ether and bis-(2-phenylthioethyl) ether, organoaluminum compounds - triethylaluminum, triisobutylaluminum, tributylaluminum and methylaluminoxane. In the course of test experiments aimed at choosing an activator at a temperature of 40 °C and an ethylene pressure of 2 MPa, the best results were obtained for triethylaluminum. Therefore, further experiments on the catalytic conversion of ethylene were carried out only with this activator. To study the effect of the reaction temperature and ethylene pressure in the reaction zone, catalytic systems of the trichlorotris-(tetrahydrofuranate)chromium(III)/ligand/triethylaluminum composition were studied in the temperature range from 40 to 80 °C and an ethylene pressure of 2 - 3 MPa with a molar ratio of components Cr : L : AlEt3 = 1 : 1 : 20. As a result of studies, it was shown that in all cases when using tridentate ligands of the SOS type, the catalytic systems formed by us showed a tendency not only to polymerization, but also to oligomerization of ethylene. The best results in the field of ethylene oligomerization into hexenes were shown by the system of the composition trichlorotris-(tetrahydrofuranate)chromium(III) / bis-(2-methylthioethyl) ether/triethylaluminum, in which the content of the hexene fraction is 54 - 55 wt.%, while the selectivity to hexene-1 reaches 88 - 89%.
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Clark, David G., and Kathleen B. Evensen. "347 ETHYLENE-INDUCED GENE EXPRESSION DURING FLOWER PETAL ABSCISSION OF ZONAL GERANIUM." HortScience 29, no. 5 (1994): 480d—480. http://dx.doi.org/10.21273/hortsci.29.5.480d.

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Ethylene-regulated gene expression is being studied in several plant systems, but the exact mechanism of ethylene action during plant development and senescence is poorly understood. When geranium (Pelargonium Xhortorum) flowers are exposed to 1 μ1/L of ethylene gas for 1 hour, petals begin to abscise within 60-90 minutes from the start of treatment, The rapidity of the response implies that it must be very direct. We now demonstrate that ethylene acts at the level of message accumulation. We have constructed a cDNA library from mRNA isolated from ethylene-treated geranium gynoecia. Ethylene-induced clones have been isolated by differential screening of this library with cDNA probes synthesized from ethylene-treated and untreated geranium gynoecia mRNA. Identification and characterization of these clones will be discussed.
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20

Burns, Jacqueline K. "1-Methylcyclopropene Applications in Preharvest Systems: Focus on Citrus." HortScience 43, no. 1 (2008): 112–14. http://dx.doi.org/10.21273/hortsci.43.1.112.

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1-Methylcyclopropene (1-MCP) is a gaseous ethylene-binding inhibitor used to control or delay ethylene-related postharvest effects in a range of horticultural commodities. The potential for preharvest applications of 1-MCP to prevent unwanted defoliation using ethephon to loosen mature citrus fruit is presented. Although there was no difference in mature fruit loosening by ethephon + 1-MCP treatments, 1-MCP reduced defoliation caused by ethephon. The gaseous nature of 1-MCP is an impediment to uniform application and consistent efficacy. A sprayable 1-MCP formulation would be of great value for preharvest use in many horticultural crops.
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21

Musaev, Sayfullo, and Gulnoz Samiyeva. "Study of the morphology of shoe sole composites based on domestic suspension polyvinyl chloride and ethylene-vinyl acetate copolymer." E3S Web of Conferences 390 (2023): 05018. http://dx.doi.org/10.1051/e3sconf/202339005018.

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The paper studies the surface morphology of the initial polymers and the mixture using a scanning electron microscope SEM - EVO MA 10 (Zeiss, Germany). The X-ray phase analysis was carried out on a Panalytical Empyrean diffractometer. It has been proven that polymer mixtures based on domestic suspension polyvinyl chloride and ethylene-vinyl acetate copolymer, obtained by the method of "thermomechanical" mixing, are two-phase systems consisting of a phase of polyvinyl chloride and an ethylene- vinyl acetate copolymer. It was concluded that suspension polyvinyl chloride is fundamental in this system, which determines the main deformation-strength properties of the mixture. In the process of mixing a certain ratio of copolymer and thermoplastic, two-phase systems are formed, that is, mechanical mixtures of technologically compatible polymers with very close values of solubility parameters are formed. It has been determined that polymer mixtures based on domestic suspension polyvinyl chloride and an ethylene-vinyl acetate copolymer, obtained by the method of "thermomechanical" mixing, are two-phase systems consisting of a phase of polyvinyl chloride and an ethylene-vinyl acetate copolymer.
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Zhang, L. W., G. J. Chen, C. Y. Sun, et al. "The partition coefficients of ethylene between hydrate and vapor for methane + ethylene + water and methane + ethylene + SDS + water systems." Chemical Engineering Science 60, no. 19 (2005): 5356–62. http://dx.doi.org/10.1016/j.ces.2005.05.014.

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Huddleston, Jonathan G., Terita K. Looney, Grant A. Broker, Scott T. Griffin, Scott K. Spear, and Robin D. Rogers. "Comparative Behavior of Poly(ethylene glycol) Hydrogels and Poly(ethylene glycol) Aqueous Biphasic Systems." Industrial & Engineering Chemistry Research 42, no. 24 (2003): 6088–95. http://dx.doi.org/10.1021/ie030351x.

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Poole, MC, and DC Joyce. "A simple and reliable ethylene gassing system for plant studies." Australian Journal of Experimental Agriculture 33, no. 4 (1993): 507. http://dx.doi.org/10.1071/ea9930507.

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An ethylene permeation system was tested in a study of flower abscission of Verticordia nitens (Lindley) Endl. Various concentrations of ethylene in air were generated by passing air, at a flow rate of 2 L/min, through chambers containing various lengths of polyvinyl chloride (PVC) tubing pressurised (50 kPa) with ethylene. Ethylene permeating through lengths of PVC tubing of 1.5, 15, 150, and 1500 cm (8 mm internal diameter, 1.5 mm wall thickness) gave ethylene concentrations in the outflow airstreams of 0.12, 0.99, 7.8, and 100 �L/L, respectively. Increasing the ethylene pressure in 150-cm-long tubing linearly increased the permeation of ethylene (0.07 �L/L. kPa). A log-linear abscission response of V. nitens flowers to increasing ethylene concentration was demonstrated using this system. Use of silicone tubing (8-mm internal diameter, 1.5-mm wall thickness) resulted in an ethylene flux 75 times that of the same length of PVC tubing. Higher flux through silicone tubing should allow development of ethylene permeation gassing systems suitable for use in fruit ripening and degreening rooms.
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Esteban, Jesús, Miguel Ladero, and Félix García-Ochoa. "Liquid–liquid equilibria for the systems ethylene carbonate + ethylene glycol + glycerol; ethylene carbonate + glycerol carbonate + glycerol and ethylene carbonate + ethylene glycol + glycerol carbonate + glycerol at catalytic reacting temperatures." Chemical Engineering Research and Design 94 (February 2015): 440–48. http://dx.doi.org/10.1016/j.cherd.2014.08.024.

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Golden, K. D., and O. J. Williams. "Ethylene Oxide in Plant Biological Systems: A Review." Asian Journal of Biological Sciences 7, no. 4 (2014): 144–50. http://dx.doi.org/10.3923/ajbs.2014.144.150.

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Krasilnikov, V. N., V. V. Antsygina, and G. V. Bazuev. "Glycolic alcoholates formation in MmCuOn-ethylene glycol systems." Materials Research Bulletin 31, no. 5 (1996): 565–72. http://dx.doi.org/10.1016/s0025-5408(96)00030-x.

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Hatakeyma, Tatsuko, Hazuki Kasuga, Masaru Tanaka, and Hyoe Hatakeyama. "Cold crystallization of poly(ethylene glycol)–water systems." Thermochimica Acta 465, no. 1-2 (2007): 59–66. http://dx.doi.org/10.1016/j.tca.2007.09.005.

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McGinnis, B. "Degradation of ethylene glycol in photo Fenton systems." Water Research 34, no. 8 (2000): 2346–54. http://dx.doi.org/10.1016/s0043-1354(99)00387-5.

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McKenna, Timothy F. "Solubility and crystallinity data for ethylene/polyethylene systems." European Polymer Journal 34, no. 9 (1998): 1255–60. http://dx.doi.org/10.1016/s0014-3057(97)00251-6.

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Pragliola, Stefania, Chiara Costabile, and Vincenzo Venditto. "Ethylene/1,3-butadiene cyclocopolymerization catalyzed by zirconocene systems." European Polymer Journal 58 (September 2014): 157–63. http://dx.doi.org/10.1016/j.eurpolymj.2014.06.020.

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Hachiya, N., Y. Birukawa, T. H. Quan, and Y. Takizawa. "Genotoxicity of ethylene dibromide in different assay systems." Mutation Research/Environmental Mutagenesis and Related Subjects 272, no. 3 (1992): 255. http://dx.doi.org/10.1016/0165-1161(92)91552-3.

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Reddy, S. "Homogeneous metallocene-methylaluminoxane catalyst systems for ethylene polymerization." Progress in Polymer Science 20, no. 2 (1995): 309–67. http://dx.doi.org/10.1016/0079-6700(94)00035-z.

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Justino, Jorge, A. Romão Dias, José Ascenso, Maria M. Marques, and Peter J. T. Tait. "Polymerization of ethylene using metallocene and aluminoxane systems." Polymer International 44, no. 4 (1997): 407–12. http://dx.doi.org/10.1002/(sici)1097-0126(199712)44:4<407::aid-pi844>3.0.co;2-1.

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35

Özdemir, Cemile, and Ali Güner. "Solution thermodynamics of poly(ethylene glycol)/water systems." Journal of Applied Polymer Science 101, no. 1 (2006): 203–16. http://dx.doi.org/10.1002/app.23191.

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36

Panayotov, Ivan M., Nadya Belcheva, Rayna Stamenova, et al. "Crosslinked poly(ethylene oxide) for drug release systems." Macromolecular Symposia 103, no. 1 (1996): 193–211. http://dx.doi.org/10.1002/masy.19961030119.

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Zhao, Liang, Weimin Zhong, and Wenli Du. "Data-Driven Robust Optimization for Steam Systems in Ethylene Plants under Uncertainty." Processes 7, no. 10 (2019): 744. http://dx.doi.org/10.3390/pr7100744.

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In an ethylene plant, steam system provides shaft power to compressors and pumps and heats the process streams. Modeling and optimization of a steam system is a powerful tool to bring benefits and save energy for ethylene plants. However, the uncertainty of device efficiencies and the fluctuation of the process demands cause great difficulties to traditional mathematical programming methods, which could result in suboptimal or infeasible solution. The growing data-driven optimization approaches offer new techniques to eliminate uncertainty in the process system engineering community. A data-driven robust optimization (DDRO) methodology is proposed to deal with uncertainty in the optimization of steam system in an ethylene plant. A hybrid model of extraction–exhausting steam turbine is developed, and its coefficients are considered as uncertain parameters. A deterministic mixed integer linear programming model of the steam system is formulated based on the model of the components to minimize the operating cost of the ethylene plant. The uncertain parameter set of the proposed model is derived from the historical data, and the Dirichlet process mixture model is employed to capture the features for the construction of the uncertainty set. In combination with the derived uncertainty set, a data-driven conic quadratic mixed-integer programming model is reformulated for the optimization of the steam system under uncertainty. An actual case study is utilized to validate the performance of the proposed DDRO method.
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38

Delgado, C., JN Patel, GE Francis, and D. Fisher. "Coupling of poly(ethylene glycol) to albumin under very mild conditions by activation with tresyl chloride: characterization of the conjugate by partitioning in aqueous two‐phase systems." Biotechnology and Applied Biochemistry 12, no. 2 (1990): 119–28. http://dx.doi.org/10.1111/j.1470-8744.1990.tb00085.x.

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Poly(ethylene glycol) activated with tresyl chloride has been covalently linked to albumin as a result of a 2‐h incubation in 0.05 M sodium phosphate buffer, pH 7.5, containing 0.125 M sodium chloride (0.344 OSM). The coupling of poly(ethylene glycol) to albumin was demonstrated by the increase in the partition coefficient of the protein in poly(ethylene glycol)‐dextran aqueous two‐phase systems. A linear relationship between the log of the partition coefficient of the poly(ethylene glycol)‐albumin conjugate and the degree of modification (measured as the amino groups consumed during the coupling step) has been demonstrated. Countercurrent distribution in the two‐phase system showed that poly(ethylene glycol)‐albumin was heterogeneous with respect to its partitioning behavior, indicating that the albumin was not uniformly modified with poly(ethylene glycol).
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39

Тetiana, Mamenko, and Kots Sergii. "Stress-induced ethylene production by soybean symbiotic systems depending on genetic characterization of Bradyrhizobium strains." Modern Phytomorphology 16, no. 2 (2022): 28–31. https://doi.org/10.5281/zenodo.7735556.

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The production of ethylene by soybeans symbiotic systems associated with different Bradyrhizobium strains during the treatment of seeds with fludioxanil (fungicide) and exposure to drought was studied. It was found that the intensity of ethylene release by soybean plants during pre-sowing fungicide seed treatment and insufficient water supply primarily depends on the genetic characteristics and symbiotic properties of the of Bradyrhizobium strain. It is shown that the treatment of soybean seeds with a fungicide does not significantly change the dynamics of ethylene production by soybean plants in symbiosis with different strains of Bradyrhizobium japonicum under drought conditions. This proves the possibility of using seed inoculation with active rhizobia strains in combination with fungicide treatment for soybean cultivation in arid conditions.
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40

He, Chuanjiu, Fred Davies*, Ronald Lacey, and Que Ngo. "Hypobaria Affects Gas Exchange, Ethylene Evolution and Growth of Lettuce in NASA Advanced Life Support Systems (ALS)." HortScience 39, no. 4 (2004): 794A—794. http://dx.doi.org/10.21273/hortsci.39.4.794a.

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Elevated levels of ethylene occur in enclosed crop production systems and in space-flight environments—leading to adverse plant growth and sterility. There are engineering advantages in growing plants at hypobaric (reduced atmospheric pressure) conditions in biomass production for extraterrestrial base or spaceflight environments. Objectives of this research were to characterize the influence of hypobaria on gas exchange and ethylene evolution of lettuce (Lactuca sativa L. cv. Buttercrunch). Lettuce was grown under variable total gas pressures [50 and 101 kPa (ambient)]. The six chambered, modular low plant growth (LPPG) system has a Rosemount industrial process gas chromatograph (GC) for determining gas concentrations of oxygen (O2), carbon dioxide (CO2) and nitrogen (N). With the LPPG system, changes in CO2 can be tracked during the light and dark periods on a whole canopy basis, and transpirate collected as a measurement of transpiration. During short growth periods of up to seven days, growth was comparable between low and ambient pressure. However, there was a tendency for leaf tip burn under ambient pressure, in part because of higher ethylene levels. Tip burn increased under high light (600 vs. 300 μmol·m-1·s-1) and high CO2 (600 vs. 100 Pa). The CO2 assimilation rate and dark respiration tended to be higher under ambient conditions. High humidity (100%) reduced CO2 assimilation rate compared to 70% RH. Ethylene was increased by high light (600 vs. 300 μmol·m-1·s-1) and high CO2 (600 vs. 100 Pa). Ethylene was higher under ambient than low pressure. Enhanced plant growth under low pressure may be attributed to reduced ethylene production and decreased dark respiration (lower night consumption of metabolites).
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41

Robinson, D., and CA McCoy. "Ethylene glycol toxicity." Critical Care Nurse 9, no. 6 (1989): 70–74. http://dx.doi.org/10.4037/ccn1989.9.6.70.

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Ingestion of ethylene glycol is a rare occurrence, but it is an attractive agent for intoxication and suicide. Treatment is aimed at rapid excretion of the EG, prevention of the formation of metabolites, and the prevention and treatment of renal failure. Prior to discharge, Mr K revealed that he had drunk the antifreeze because he was despondent about his work situation. He had a short, but intensive trajectory that followed the three-system-involvement classic to EG poisoning, with the renal system most severely affected. Mr K was discharged from the hospital one week after admission and referred to appropriate community resources for counseling. The critical care nurse plays a key role in alleviating the hazards of this complex disorder through complete and ongoing assessment of all systems.
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Khamiyev, M. J. "Zr-BASED HETEROGENİZED CATALYTİC SYSTEMS FOR OLİGOMERİZATİON OF ETHYLENE TO OLEFİNS AND OİL FRACTİONS." Azerbaijan Chemical Journal, no. 4 (December 12, 2019): 105–14. http://dx.doi.org/10.32737/0005-2531-2019-4-105-114.

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Duan, You Rong, W. S. Liu, J. Liu, and Z. R. Zhang. "A Study on PELGE Nanoparticles as Controlled Drug Delivery Systems for Intravenous." Key Engineering Materials 288-289 (June 2005): 163–66. http://dx.doi.org/10.4028/www.scientific.net/kem.288-289.163.

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The objective of this study was to evaluate the in vivo characteristics of poly (ethylene glycol)-poly (lacticacid-co-glycolicacid)-poly (ethylene- glycol) (PELGE) copolymers as drug carriers. In order to test this circulation time, mitoxantrone (DHAQ) was used as a model drug in this study. DHAQ nanoparticles (DHAQ-NP) were prepared, subsequently the DHAQ-NP were evaluated by measuring the drug concentration in plasma after intravenous administration via the tail vein of mice. The circulation time of the DHAQ-NP were tested. The results showed prolonged mitoxantrone (DHAQ) residence in systemic blood circulation.
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44

Mendes, Gisela C., Teresa R. S. Brandão, and Cristina L. M. Silva. "Kinetics of Ethylene Oxide Desorption from Sterilized Materials." Journal of AOAC INTERNATIONAL 96, no. 1 (2013): 33–36. http://dx.doi.org/10.5740/jaoacint.11-506.

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Abstract Ethylene oxide gas is commonly used to sterilize medical devices, and concerns about using this agent on biological systems are well-established. Medical devices sterilized by ethylene oxide must be properly aerated to remove residual gas and by-products. In this work, kinetics of ethylene oxide desorption from different sterilized materials were studied in a range of aeration temperatures. The experimental data were well-described by a Fickian diffusion mass transfer behavior, and diffusivities were estimated for two textile and two polymeric materials within the temperature range of 1.5 to 59.0°C. The results will allow predictions of ethylene oxide desorption, which is a key step for the design of sterilization/aeration processes, contributing to an efficient removal of residual ethylene oxide content.
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45

Baldwin, E. A., and R. Pressey. "Tomato Polygalacturonase Elicits Ethylene Production in Tomato Fruit." Journal of the American Society for Horticultural Science 113, no. 1 (1988): 92–95. http://dx.doi.org/10.21273/jashs.113.1.92.

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Abstract Fungal cell-wall lysing enzymes have been shown to induce ethylene production in different plant systems. The effect of endogenous plant cell-wall lysing enzymes on ethylene synthesis in fruit has received only limited attention. Therefore, tomato fruit (Lycopersicon esculentum, Mill.) were vacuum–infiltrated with the tomato cell-wall enzymes, polygalacturonase I and II (PG I, PG II) and pectinmethylesterase (PME). Fruit ethylene levels were observed to increase relative to either salt, buffer, or boiled enzyme controls. This increase in ethylene production occurred in green ‘Cherry’ tomato fruit as well as in the mutants rin, nor, and Cornell 111. Enzyme-induced ethylene synthesis generally peaked at or before 17 to 20 hr and decreased to lower or basal levels in most immature normal cultivars by 42 hr after treatment. Ethylene was maintained at high levels, however, in some (possibly more mature) green fruit, as well as in all mutant lines. PG II was more effective than PG I in inducing ethylene production and PME seemed to enhance the ethylene-inducing activity of PG II.
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46

Buluchevskiy, E. A., T. R. Karpova, L. F. Sayfulina, and A. V. Lavrenov. "Direct Synthesis of Propylene from Ethylene: catalysts and process es." Российский химический журнал 62, no. 1-2 (2019): 110–16. http://dx.doi.org/10.6060/rcj.2018621-2.8.

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Promising technologies for a one-stage production of propylene from ethylene were considered. The basic types of catalysis systems used as heterogeneous catalysts for the one-stage production of propylene from ethylene were presented. These are zeolites, silicoaluminophosphates, mesoporous molecular sieves, nickel-, tungsten-, molybdenum- and rhenium-containing catalysts.
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TAKAHASHI, Masato, Nobuyuki HARASAWA, and Hirohisa YOSHIDA. "Isothermal crystallization of poly(ethylene oxide) in poly(ethylene oxide)/poly(methyl methacrylate) blend systems." KOBUNSHI RONBUNSHU 47, no. 5 (1990): 455–58. http://dx.doi.org/10.1295/koron.47.455.

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Bal’zhinimaev, B. S., E. A. Paukshtis, and E. V. Kovalyov. "Selective hydrogenation of acetylene over Pd on glass fiber catalysts." Kataliz v promyshlennosti 19, no. 5 (2019): 334–44. http://dx.doi.org/10.18412/1816-0387-2019-5-334-344.

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Key properties of silicate glasses are highlighted including the capability of stabilizing disperse Pd nanoparticles in the bulk of glass fibers (GF), high solubility of acetylene and hydrogen, as well as their high mobility. These properties provide the high activity and selectivity of Pd/GF catalysts to hydrogenation of acetylene in excess ethylene over a wide range of acetylene conversions up to its complete one. For a wide variety of mono-, bimetallic systems including catalysts with single palladium atoms, TOF was established to depend only slightly on the palladium dispersion and support nature, i.e. the reaction can be considered structure-insensitive. Nevertheless, a TOF decrease was observed in the systems with single atoms; that was accounted for by declining of the hydrogen dissociation rate or its slower spillover. Isotope-kinetic data were used for determining quantitatively undesirable contributions to the process selectivity caused by both hydrogenation of acetylene and gas-phase ethylene to ethane. High selectivities of alloyed bimetallic systems comprising isolated palladium atoms at approaching to the complete conversion of acetylene were caused by the low rate of hydrogenation of weakly adsorbed ethylene to ethane while for Pd/GF catalysts by the complete exclusion of the hydrogenation of ethylene from gas-phase.
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Mannu, Alberto, Maria Enrica Di Pietro, and Andrea Mele. "Band-Gap Energies of Choline Chloride and Triphenylmethylphosphoniumbromide-Based Systems." Molecules 25, no. 7 (2020): 1495. http://dx.doi.org/10.3390/molecules25071495.

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UV–VIS spectroscopy analysis of six mixtures containing choline chloride or triphenylmethylphosphonium bromide as the hydrogen bond acceptor (HBA) and different hydrogen bond donors (HBDs, nickel sulphate, imidazole, d-glucose, ethylene glycol, and glycerol) allowed to determine the indirect and direct band-gap energies through the Tauc plot method. Band-gap energies were compared to those relative to known choline chloride-containing deep band-gap systems. The measurements reported here confirmed the tendency of alcohols or Lewis acids to increment band-gap energy when employed as HBDs. Indirect band-gap energy of 3.74 eV was obtained in the case of the triphenylmethylphosphonium bromide/ethylene glycol system, which represents the smallest transition energy ever reported to date for such kind of systems.
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Graczová, Elena, Július Surový, and Soňa Bafrncová. "Ternary Corrections in the Liquid-Liquid Equilibria Computation for Three-Component Systems Containing Components of Mixed Solvent N-Methylpyrrolidone-Ethylene Glycol." Collection of Czechoslovak Chemical Communications 57, no. 1 (1992): 7–15. http://dx.doi.org/10.1135/cccc19920007.

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Presented are the liquid-liquid (L-L) equilibrium data for three-component heterogeneous systems toluene-N-methylpyrrolidone-ethylene glycol, heptane-N-methylpyrrolidone-ethylene glycol and heptane-toluene-ethylene glycol at 50 °C. Equations for the excess Gibbs energy (NRTL. Novák modification of Wilson equation and Redlich-Kister 4th order expansion) extended by ternary universal contribution were employed for correlating the L-L equilibrium data. The binary equation parameters were independently evaluated from the binary equilibrium data. The presented ternary data served for evaluation of parameters of the universal ternary contribution.
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