يعرض 1 - 5 نتائج من 5 نتيجة بحث عن '"four different samples"', وقت الاستعلام: 0.62s تنقيح النتائج
  1. 1
    دورية أكاديمية
  2. 2
    دورية أكاديمية
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    المساهمون: Montes, Daniel, Taborda, Esteban A., Minale, Mario, Cortés, Farid B., Franco-Ariza, Camilo A.

    المصدر: Energy & Fuels. 33:9671-9680

    مصطلحات موضوعية: the power per unit of volume dissipated during a hysteresis cycle was decreased of about the 70%, This manuscript has the primary objective of demonstrating the changes in the rheological behavior of heavy crude oils (HO) in response to the application of ultrasound cavitation assisted with NiO-functionalized SiO2 nanoparticles (SiNi1). A HO with an asphaltene mass fraction of 17.0% was used for the tests which were carried out at 25 °C and 1 atm with a fixed ultrasound frequency and power of 37 kHz and 400 W, respectively. The viscosity measurements were performed on four different samples: the HO in the absence of nanoparticles and ultrasound irradiation (sample A), the HO alongside ultrasound irradiation (sample B), the HO with the addition of nanoparticles (sample C), and, finally, the HO in the presence of the mentioned nanomaterial and ultrasound irradiation (sample D). It was observed that a single treatment, whatever it is, only slightly changed the original HO rheology, while the cooperative action of ultrasound cavitation and nanoparticles addition induced several measurable differences with respect to the HO: The viscosity was reduced up to 50–60%, depending on the applied shear rate, Materials science, Steady state (electronics), Rheometry, General Chemical Engineering, Non-blocking I/O, Ultrasound cavitation, Energy Engineering and Power Technology, Nanoparticle, 02 engineering and technology, 021001 nanoscience & nanotechnology, Fuel Technology, 020401 chemical engineering, Rheology, sense organs, 0204 chemical engineering, Composite material, the sample elasticity was measurably reduced, and accordingly, the relaxation time measurable for the original HO was not detectable anymore. These findings can be explained by hypothesizing that the original HO viscoelastic microstructure is broken down by the proposed combined treatments as the asphaltenes may stably adsorb on the nanoparticles and the subsequent size reduction process of the asphaltene aggregates is enhanced by the ultrasound irradiation, skin and connective tissue diseases, 0210 nano-technology, Cavitation (process)

  4. 4
    دورية أكاديمية

    المساهمون: Montes, Daniel, Taborda, Esteban A., Minale, Mario, Cortés, Farid B., Franco-Ariza, Camilo A.

    مصطلحات موضوعية: This manuscript has the primary objective of demonstrating the changes in the rheological behavior of heavy crude oils (HO) in response to the application of ultrasound cavitation assisted with NiO-functionalized SiO2 nanoparticles (SiNi1). A HO with an asphaltene mass fraction of 17.0% was used for the tests which were carried out at 25 °C and 1 atm with a fixed ultrasound frequency and power of 37 kHz and 400 W, respectively. The viscosity measurements were performed on four different samples: the HO in the absence of nanoparticles and ultrasound irradiation (sample A), the HO alongside ultrasound irradiation (sample B), the HO with the addition of nanoparticles (sample C), and, finally, the HO in the presence of the mentioned nanomaterial and ultrasound irradiation (sample D). It was observed that a single treatment, whatever it is, only slightly changed the original HO rheology, while the cooperative action of ultrasound cavitation and nanoparticles addition induced several measurable differences with respect to the HO: The viscosity was reduced up to 50–60%, depending on the applied shear rate, the power per unit of volume dissipated during a hysteresis cycle was decreased of about the 70%, the sample elasticity was measurably reduced, and accordingly, the relaxation time measurable for the original HO was not detectable anymore. These findings can be explained by hypothesizing that the original HO viscoelastic microstructure is broken down by the proposed combined treatments as the asphaltenes may stably adsorb on the nanoparticles and the subsequent size reduction process of the asphaltene aggregates is enhanced by the ultrasound irradiation

    العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000492113000025; volume:33; issue:10; firstpage:9671; lastpage:9680; numberofpages:10; journal:ENERGY & FUELS; http://hdl.handle.net/11591/414711Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85072970522

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    رسالة جامعية

    المؤلفون: Dissanayaka, DMS

    مصطلحات موضوعية: The effects of different percentages of elastane and Nylon yarn on the dimensional and physical properties of elastanelNylon Locknit warp knitted fabrics are investigated. In order to investigate the properties ofthe fabric, four different samples were knitted by selecting four different run-in ratios of elastane and Nylon. Elastane yarn was kept at a constant elongation of 65% for all four samples. Two samples were produced keeping constant run-in of nylon yarn and changing the run-in length of elastane yarn. Then elastane yarn run-in was kept constant and produced two other samples. The sample with minimum run-in length of elastane yarn and the highest run-in ratio has the highest value of load at 20%, 40%, 60% and 80% extensions in length direction and the lowest values of load at 20%, 60% and 80% extensions in width direction. This is due to the fact that low run in of elastane yarn increases the strain on the yarn and it increases the tightness factor value of the sample and contributes higher load at extension along the length direction of the greige sample. Nylon yarn runner length influences the relaxation behavior of elastane yarn and it leads to reduce the load at extension along the width direction of the sample. Changing of Nylon yarn runner length influence the relaxation behavior of elastane yarn and it has an effect on the load at different extension in width direction and course density of the greige fabric. Results revealed that the effect of elastane content of the sample is more on the load at extension values than the effect of run-in of the Nylon yarn

    العلاقة: http://dl.lib.mrt.ac.lk/handle/123/11370Test; Engineering; MSc.; Department of Textile & Clothing Technology; 109007