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Journal articles on the topic 'Pycnometer'

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Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Sreedhara, Sudhakara Sarma, and Narasinga Rao Tata. "A Novel Method for Measurement of Porosity in Nanofiber Mat using Pycnometer in Filtration." Journal of Engineered Fibers and Fabrics 8, no. 4 (December 2013): 155892501300800. http://dx.doi.org/10.1177/155892501300800408.

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Electrospun Polymer nanofibers have a wide range of applications including automotive air filters. Large surface area, small pores, flexible and adequate porosity are widely recognized as important parameters for improving the performance of the filter media and therefore measuring the porosity of the medium is extremely important. Porosity measurement techniques such as density based method, mercury porosimetry, capillary flow porometry, image analysis are relatively inaccurate and they have some disadvantages for measuring the porosity of the nano fibers. In the present study porosity measurement for nanofiber mat using pycnometer was explored. Pycnometer is generally used to measure the density of the solids of having volumes upto 150 cc. Volume of the nanofiber was measured by pycnometer and porosity is determined as fraction of the void in total volume of the fiber. Total volume is calculated from FESEM image thickness. Various advantages of pycnometry method when compared to other techniques were discussed based on the results of porosity measurements of nanofiber mats.

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2

Rienitz, Olaf, Axel Pramann, and Carola Pape. "The pycnometer challenge." Analytical and Bioanalytical Chemistry 405, no. 17 (June 27, 2013): 5627–28. http://dx.doi.org/10.1007/s00216-013-7012-0.

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3

Rienitz, Olaf, Axel Pramann, and Carola Pape. "Solution to the pycnometer challenge." Analytical and Bioanalytical Chemistry 405, no. 27 (October 19, 2013): 8691–92. http://dx.doi.org/10.1007/s00216-013-7310-6.

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4

Adedeji, Akinbode A., and Michael Ngadi. "Porosity determination of deep-fat-fried coatings using pycnometer (Fried batter porosity determination by pycnometer)." International Journal of Food Science & Technology 46, no. 6 (May 3, 2011): 1266–75. http://dx.doi.org/10.1111/j.1365-2621.2011.02631.x.

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5

K. C. Diehl, V. A. Garwood, and C. G. Haugh. "Volume Measurement Using the Air-Comparison Pycnometer." Transactions of the ASAE 31, no. 1 (1988): 0284–87. http://dx.doi.org/10.13031/2013.30701.

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6

Eadkhong, Thammarong, and Sorasak Danworaphong. "On the sensitivity of an air pycnometer." Measurement 169 (February 2021): 108511. http://dx.doi.org/10.1016/j.measurement.2020.108511.

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7

Wyllie, Hugh A. "Syringe pycnometer for use with electronic microbalance." Analytical Chemistry 58, no. 14 (December 1986): 3269–70. http://dx.doi.org/10.1021/ac00127a081.

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8

Zhang, Chao, and N. Lu. "Measuring Soil-Water Density by Helium Pycnometer." Journal of Geotechnical and Geoenvironmental Engineering 144, no. 9 (September 2018): 02818002. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001929.

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9

Amore, Ricardo, Clóvis Pagani, Michel Nicolau Youssef, Camillo Anauate Netto, and Hugo Roberto Lewgoy. "Polymerization shrinkage evaluation of three packable composite resins using a gas pycnometer." Pesquisa Odontológica Brasileira 17, no. 3 (September 2003): 273–77. http://dx.doi.org/10.1590/s1517-74912003000300013.

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Modern restorative dentistry has been playing an outstanding role lately since composite resins, allied to adhesive systems, have been widely applied on anterior and posterior teeth restorations. The evolution of composite resins has mostly been verified due to the improvement of their aesthetic behavior and the increase in their compressive and abrasive strengths. In spite of these developments, the polymerization shrinkage inherent to the material has been a major deficiency that, so far, has been impossible to avoid. Using a gas pycnometry, this research investigated the polymerization shrinkage of three packable composite resins: Filtek P60 (3M), Prodigy Condensable (Kerr), and SureFil (Dentsply/Caulk), varying the distance from the light source to the surface of the resins (2 mm or 10 mm). The pycnometer Accupyc 1330 (Micromeritics, USA) precisely records helium displacement, allowing fast and reliable measurements of the volume of composite resin immediately before and after polymerization, without interference of temperature or humidity. Results were not found to be statistically different for the three tested resins, either for 2 mm or 10 mm-distance from the light source to the composite surface.

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10

Grabowski, A., R. Siuda, L. Lenc, and S. Grundas. "Evaluation of single-kernel density of scab-damaged winter wheat." International Agrophysics 26, no. 2 (April 1, 2012): 129–35. http://dx.doi.org/10.2478/v10247-012-0019-5.

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Evaluation of single-kernel density of scab-damaged winter wheatMeasurements of single-kernel mass and volume made on healthy (control) and scab-damaged samples of grain of three winter wheat varieties never resulted in lower values of mean single-kernel density for scab-damaged grain. This finding, contrary to common opinion, can be explained as being a result of the comparable magnitude of relative decrease (due to infestation) of two features (mass and volume) that define single-kernel density. The discrepancy between results presented in this paper (kernel volume was determined with an air pycnometer) and the results in some other reports (liquid pycnometers used) can result from the different methods applied for kernel volume measurements: when a liquid medium is used the surface tension effect tends to overestimate the volume, especially for scabby kernels that are known to be shrivellediepossessing voids and pores at the surface that the liquid cannot penetrate. As a consequence kernel density of scabby kernels can be significantly underestimated.

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11

Gideon, Samuel, and Enda Rasilta Tarigan. "Penentuan Massa Jenis Oli secara Sederhana dengan Hukum Archimedes." Physics Education Research Journal 2, no. 1 (February 29, 2020): 43. http://dx.doi.org/10.21580/perj.2020.2.1.5058.

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The most commonly used method for measuring the density of liquids is based on Archimedes' law. Lubricating oil generally has a defined density standard to show the quality of the oil. The purpose of this study is to determine oil density simply by applying Archimedes' law. This research was conducted in three steps. First, the measurement of the empty pycnometer. Second, the measurement of the pycnometer mass containing distilled water and oil. Third, measurement of copper mass in the medium of air, distilled water and oil. From the results of measurements and calculations, the obtained density of distilled water is (0.995 ± 3,582 x 10<sup>-4</sup>) gr/cm3 whose value is very close to the value of 1 gr/cm<sup>3</sup> so that the distilled water used in this study is suitable as a reference/standard in finding volume copper; oil density is (0.868 ± 2.14 x 10<sup>-3</sup>) gr/cm<sup>3</sup> whose value is very close to the value of oil density measured and calculated with a pycnometer of (0.875 ± 4.637 x 10<sup>-4</sup>) gr/cm<sup>3</sup>.

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12

Lau, W. R., C. A. Hwang, H. B. Brugge, G. A. Iglesias-Silva, H. A. Duarte-Garza, W. J. Rogers, K. R. Hall, J. C. Holste, B. E. Gammon, and K. N. Marsh. "A Continuously Weighed Pycnometer for Measuring Fluid Properties." Journal of Chemical & Engineering Data 42, no. 4 (July 1997): 738–44. http://dx.doi.org/10.1021/je970008x.

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13

Qing, Huang, and Jing Jing Zhu. "True Density Measurement of Refractory by AccyPyc1330 Pycnometer." Key Engineering Materials 492 (September 2011): 489–92. http://dx.doi.org/10.4028/www.scientific.net/kem.492.489.

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Measuring mechanism of true density measurement of refractory through gas replacement technology by the AccyPyc1330 automatic true density analyzer was introduced. Compared with the current liquid immersion method, the gas replacement technology had many advantages in time, temperature, diversity and permeability of specimens. The results indicated that it had features of accurate data, fast measurement and less factors by the gas displacement technology.

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14

SHIMAMURA, Satoshi, Katsuhiro SHIONO, and Takaki YAMAUCHI. "Measurement of plant tissue porosity: I. Pycnometer method." Root Research 30, no. 1 (March 20, 2021): 8–12. http://dx.doi.org/10.3117/rootres.30.8.

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15

Bartley, P. C., A. Amoozegar, W. C. Fonteno, and B. E. Jackson. "Particle density of substrate components measured by gas pycnometer." Acta Horticulturae, no. 1273 (March 2020): 17–22. http://dx.doi.org/10.17660/actahortic.2020.1273.3.

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16

Treat, W. J., C. R. Engler, and E. J. Soltes. "Measurement of callus growth with an air-comparison pycnometer." Biotechnology Techniques 1, no. 4 (December 1987): 235–38. http://dx.doi.org/10.1007/bf00155461.

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17

Ast, Odile, Marc Perez, and Sebastien Carlet. "PuAl alloys density measurements using gas pycnometer: First results." Journal of Alloys and Compounds 444-445 (October 2007): 226–29. http://dx.doi.org/10.1016/j.jallcom.2006.10.152.

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18

Calbo, Adonal Gimenez, and Amauri Alves Nery. "Methods for Measurement of Gas Volume of Fruits and Vegetables." Journal of the American Society for Horticultural Science 120, no. 2 (March 1995): 217–21. http://dx.doi.org/10.21273/jashs.120.2.217.

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Theory is presented for a differential mass-volume technique to measure non-destructively gas volume (Vg) changes, based only on the initial and final masses and volumes of an organ. Volume was measured using Archimedes' principle, but a non-invasive image analysis procedure could be an improvement. A reduction in Vg during the ripening of `Kada' tomato (Lycopersicon esculentum Mill) fruits, and irreversible Vg changes of 0.02, 0.29, 0.66, 1.2, and 1.3 ml for mature-green fruits compressed by 0, 2.5, 5.0, 7.5. and 10 mm for 5 minutes indicates the potential of this procedure. The method was compared with other methodologies using sweetpotato (Ipomea batatas L.) root segments subjected to vacuum water infiltration. The results were similar to the pycnometric method. The gasometric method underestimated Vg for roots in which the intercellular air volumes where blocked by the water used for infiltration, and large overestimation occurred with the traditional infiltration technique without correction for water absorption. Absolute Vg values were also estimated by semi-pycnometry (defined as the difference between the organ volume measured by water immersion and the organ volume without Vg measured with a pycnometer, after its maceration and elimination of gas bubbles with vacuum). Semi-pycnometry applied to tomato and bell pepper (Capsicum annuum L.) fruits, where the use of tissue segments limits the pycnometric method, and in sweetpotatoes, where the gasometric method overestimates Vg, generated results that were consistently similar to the differential mass-volume method.

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19

Kang, Joo H., Bumjun Kim, and Je-Kyun Park. "Microfluidic Pycnometer for in Situ Analysis of Fluids in Microchannels." Analytical Chemistry 81, no. 7 (April 2009): 2569–74. http://dx.doi.org/10.1021/ac802492q.

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20

Karel, Miloslav, Jaroslav Nývlt, and Angelo Chianese. "Crystallization of Pentaerythritol I. Solubility, Density and Metastable Zone Width." Collection of Czechoslovak Chemical Communications 59, no. 6 (1994): 1261–69. http://dx.doi.org/10.1135/cccc19941261.

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Solubility of pentaerythritol in water has been determined using literature data, the polythermal method and the dry residue method. Densities of its aqueous solutions have been measured using a pycnometer. Kinetics of crystallization of the pentaerythritol has been determined in laboratory experiments. In this paper, metastable zone width measurements have been employed for the assessment of the primary nucleation rate.

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21

Atyim, Paul, I. Bolocan-Viasu, O. Croitoru, C. Tigae, AI Popescu, and G. Ardelean. "A NEW METHOD OF COAL SEPARA TION IN GRANULOMETRIC CLASSES AND THE STUDY OF SOME ANAL YTICAL PROPERTIES." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 15, no. 15 (December 20, 2007): 71–80. http://dx.doi.org/10.48141/sbjchem.v15.n15.2007.73_revistadec2007partial.pdf.

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Coal is a complex heterogeneous material and for its knowledge a homogeneous fractionation is necessary. Coal presents variations in the same grains depending on density, so a more adequate fractionation is obtained by its separation according to density. The density was determined with a pycnometer and the separation of coal in different fractions according to density. The organic and inorganic solutions were replaced with distilled water.

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22

Bielders, C. L., L. W. De Backer, and B. Delvaux. "Particle Density of Volcanic Soils as Measured with a Gas Pycnometer." Soil Science Society of America Journal 54, no. 3 (May 1990): 822–26. http://dx.doi.org/10.2136/sssaj1990.03615995005400030034x.

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23

Westwood, B. M., and V. N. Kabadi. "A novel pycnometer for density measurements of liquids at elevated temperatures." Journal of Chemical Thermodynamics 35, no. 12 (December 2003): 1965–74. http://dx.doi.org/10.1016/j.jct.2003.08.005.

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24

BALUJA, S., A. KULSHRESTHA, and M. BHATT. "ULTRASONIC STUDIES OF ANTIPROTOZOAL DRUG IN PROTIC AND APROTIC SOLVENTS AT 308.15 K." Latin American Applied Research - An international journal 44, no. 1 (January 31, 2014): 93–95. http://dx.doi.org/10.52292/j.laar.2014.424.

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Ultrasonic velocities and density of various concentrations (0.01 to 0.10M) of anti protozoal drog “Diloxanide Furoate” in methanol, dimethyl formamide and 1,4-dioxan have been measured at 308.15 K by using single crystal variable path ultrasonic interferometer operating at 2 MHz and pycnometer respectively. Using these experimental data, some acoustical parameters have been evaluated and they are interpreted in terms of solute-solute and solute-solvent interactions in these solutions.

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25

Wang, Weikai, Minghan Li, and Jiabin Cai. "Effects of extraction process on the dried cell wall pore structure of messmate heartwood." BioResources 16, no. 3 (July 16, 2021): 6074–82. http://dx.doi.org/10.15376/biores.16.3.6074-6082.

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In order to study the effects of a messmate heartwood extraction process on its cell wall pore structure and its drying ability, its nanopore structure was explored after via gas adsorption technology. Specifically, the messmate heartwood particles were extracted with methanol, and then the cell wall pore structure of the original and extracted samples were evaluated by N2 and CO2 sorption and pycnometer methods, respectively. Overall, compared with the original samples, the cell wall porosity, micropore volume, mesopore volume, BET specific surface area, and specific surface area of the micropores of the extracted messmate heartwoods increased by 2.55%, 0.007 cm3/g, 0.0014 cm3/g, 0.24 m2·g-1, and 21.9 m2·g-1, respectively. The cell wall pore volume measured via the gas adsorption method was smaller than the measurement from the pycnometer method. The results indicated that the presence of extractives made the messmate cell wall have a decreased pore volume and porosity, which may be one of the reasons messmate wood is difficult to dry. Messmate extractives primarily were present in the micropores of the cell wall in the range of 0.4 nm to 0.7 nm. However, gas sorption technology could not detect all the pores in the cell wall of the messmate heartwood sample.

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26

Oppenheimer, Jason R., Andrew G. Martin, and Larry P. Walker. "Measurements of air-filled porosity in unsaturated organic matrices using a pycnometer." Bioresource Technology 59, no. 2-3 (February 1997): 241–47. http://dx.doi.org/10.1016/s0960-8524(96)00155-1.

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27

Ruggieri, L., T. Gea, A. Artola, and A. Sánchez. "Factors Affecting Air Pycnometer Performance For its Use in the Composting Process." Compost Science & Utilization 17, no. 4 (September 2009): 266–75. http://dx.doi.org/10.1080/1065657x.2009.10702433.

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28

Sadagopan, Madumita, Katarina Malaga, and Agnes Nagy. "Modified pycnometer method to measure the water absorption of crushed concrete aggregates." Journal of Sustainable Cement-Based Materials 9, no. 5 (January 27, 2020): 259–69. http://dx.doi.org/10.1080/21650373.2020.1715902.

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29

Strubinger, Adelitza, Ursula Ehrmann, and Vladimir León. "Using the Gas Pycnometer to Determine API Gravity in Crude Oils and Blends." Energy & Fuels 26, no. 11 (October 11, 2012): 6863–68. http://dx.doi.org/10.1021/ef301193x.

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30

Limbu, Kuber, Sujit Kumar Shah, and Ajaya Bhattarai. "Density and partial molar volume of Sodium Dodecyl Sulfate in presence and absence of Sodium Sulfate and Zinc Sulfate in distilled water." BIBECHANA 16 (November 22, 2018): 131–36. http://dx.doi.org/10.3126/bibechana.v16i0.21515.

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The precise measurements of density of sodium dodecyl sulfate (SDS) in distilled water and in presence of 0.01M Na2SO4 and 0.01M ZnSO4 atroom temperature were measured by Ostwald-Sprengel type pycnometer. The density of SDS in distilled water was found lower than the density of SDS in Na2SO4 and ZnSO4 solutions whereas the density of SDS in the presence of ZnSO4 is higher than the density of SDS in the presence of Na2SO4. The partial molar volume of SDS in distilled water was obtained higher than in presence of Na2SO4 and ZnSO4 solutions.BIBECHANA 16 (2019) 131-136

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31

Khomenko, Anton, Mikhail Garibov, Ermias G. Koricho, Nataliia Garibov, Graham Killip, and Mahmoodul Haq. "High precision pycnometer for volumetric measurement of polymerization shrinkage in light cured dental composites." Measurement 91 (September 2016): 601–5. http://dx.doi.org/10.1016/j.measurement.2016.05.103.

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32

O. O. Fasina. "Technical Note: Measuring Grain and Legume Seed Density Using Pycnometer and Envelope Density Analyzer." Transactions of the ASABE 53, no. 4 (2010): 1223–27. http://dx.doi.org/10.13031/2013.32579.

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33

Mićić, Ljiljana, and Elsa Batista. "Comparison of a 50 mL pycnometer and a 500 mL flask, EURAMET.M.FF.S8 (EURAMET 1297)." Metrologia 55, no. 1A (January 1, 2018): 07003. http://dx.doi.org/10.1088/0026-1394/55/1a/07003.

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34

David Suits, L., TC Sheahan, S. Tamari, and RI López-Hernández. "Optimum Design of the Comparative Gas Pycnometer for Determining the Volume of Solid Particles." Geotechnical Testing Journal 29, no. 1 (2006): 12667. http://dx.doi.org/10.1520/gtj12667.

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35

Hoque, Mehrin, Akhila Palat, and Michael Hendry. "A Preliminary Study on the Engineering Properties of Clay Soil." Alberta Academic Review 2, no. 2 (September 10, 2019): 39–40. http://dx.doi.org/10.29173/aar47.

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Karl Von Terzaghi, the father of soil mechanics, says, “There is no other soil which is as problematic as clay soil”. In many places across the badlands of Alberta, clay soil is known to be troublesome and cause issues with buildings and infrastructure. Climate conditions, erosion and weathering can cause the unstable clay soil to create landslides, which consequently damage many of these structures. For this reason, engineers are sent to these sites to monitor and collect data over a period of time to compare and contrast their results. The purpose of this study is to learn and understand the properties of clay soils through different classification and index tests. Two clay soils, kaolinite and bentonite, were tested for their properties and their results were compared. Some of the tests performed include the hydrometer analysis, pycnometer analysis, and atterberg limits. The hydrometer analysis is the process in determining the size of silts and clays (when sieves cannot be used). The pycnometer analysis is used to determine the specific gravity of a substance. Atterberg limits are used to determine the water content at which a soil starts to shift from liquid, plastic or semi-solid. These tests were done in two different solutions - one containing distilled water and one with saline water - to understand the effect of the solution on the liquid and plastic limits. The goal of this study was achieved and the results can be used to understand more about the engineering properties of clay soils and apply these studies to future field work. By understanding these properties, further research can be done to discover long term solutions to landslides caused by the problematic soil.

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36

De Araújo Reis, Rômulo, Bruna Moraes de Oliveira, Lívia Da Silva Oliveira, and David Barbosa de Alencar. "Study of the Physical Aspects of Residential Soils of Iranduba - AM." International Journal for Innovation Education and Research 7, no. 10 (October 31, 2019): 82–89. http://dx.doi.org/10.31686/ijier.vol7.iss10.1748.

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The objective of this work is to study the physical indices of soil samples collected in different points of the municipality of Iranduba - Am. The parameters analyzed were moisture content, porosity, aeration degree, specific weight among others. For the physical characterization of the soil, samples with deformed structure were collected, prepared according to procedures described in the standard procedures described by the NBR 6457 standard (ABNT, 1986). The tests were performed using a high precision glass pycnometer. The tests resulted in samples with high voids and porosity, lower values of saturation degree as their low percentage. The specific grain weight presented satisfactory results meeting the criteria established by the standard.

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37

Kanwal, Tehreem, Rub Nawaz Shahid, Naeem Ul Haq Tariq, Fahad Ali, M. A. Rafiq, Muhammad Iqbal, J. I. Akhter, and Bin Awais Hasan. "A Comparison of the Electrical and Thermal Behavior of ZrO₂-Ni Interpenetrating Phase Composite Produced by Microwave and Conventional Sintering." Key Engineering Materials 510-511 (May 2012): 293–300. http://dx.doi.org/10.4028/www.scientific.net/kem.510-511.293.

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The ceramic-metal composites that have all phases continuous throughout the structure are known as Interpenetrating Phase Composites (IPCs) and they have many applications in various fields. In this investigation ZrO2-Ni IPCs of varied compositions were synthesized using tubular furnace and microwave furnace routs. Samples were Characterized using BET surface area, Pycnometer density, dilatometry and scanning electron microscopy. The Electrical parameters of the composites were measured using impedance spectrometer. Results indicate that threshold percolation reached at 40 volume percent of Ni in both cases. Moreover, no significant difference was observed in BET surface area and CTE of composites prepared by conventional and microwave sintering processes.

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38

Malek, Nurul Izzati Abd, Ismariza Ismail, and Nafisah Osman. "Characterization of LSCF Cathode Material Modified with f-CNTs." Solid State Phenomena 307 (July 2020): 154–59. http://dx.doi.org/10.4028/www.scientific.net/ssp.307.154.

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Cathode is one of the important parts in performing the high efficiency of proton conducting fuel cell (PCFC). Selection of appropriate cathode material may resolve the major drawbacks at the cathode part associated with the high Rp. Accordingly, tremendous effort have been done to reduce the Rp and one of the alternatives is the modification of cathode microstructure that can be achieved by introducing dispersing agent in the synthesis route. Thus, in this present work, a functionalized carbon nanotubes (f-CNTs) obtained from acidification process was used as a dispersing agent in the synthesis of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode material. The amount of 4 mg, 8 mg and 12 mg of f-CNTs were respectively added to LSCF cathode during the synthesizing process by a sol-gel method. Semi-solid gel obtained was calcined at 900 °C to form high purity of LSCF powder and respectively denoted as LSCF4, LSCF8 and LSCF12. The powder was characterized by Fourier Transform Infrared (FTIR) Spectroscopy, Pycnometer, Particle Size Analyzer and Scanning Electron Microscopy with Energy Dispersive X-ray (SEM/EDX). The FTIR analysis depicted the peak of respective metal complexes, metal oxide, symmetrical and asymmetrical stretching of carboxylate. The pycnometer showed the lowest density of LSCF4 was 2.8777 g/cm3. The Particles Size Analyzer confirmed the particle size of 38 nm ultrafine powder for LSCF4. The SEM image depicted the highly disperse spherical particles found in LSCF4 with particle size about 30 nm. The elemental composition of the samples is comparable with the nominal stoichiometric of LSCF4 as corroborated by the EDX analysis. Therefore, the LSCF with optimum 4 mg f-CNTs as dispersing agent has potential as nanoporous cathode material for proton conductivity fuel cell.

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39

Wozniak, J., M. Kostecki, K. Broniszewski, W. Bochniak, and A. Olszyna. "Influence of Mixing Parameters on Homogeneity of Al/Sic Composites/ Wpływ Parametrów Mieszania Na Jednorodność Kompozytów Al/Sic." Archives of Metallurgy and Materials 59, no. 4 (December 1, 2014): 1493–98. http://dx.doi.org/10.2478/amm-2014-0254.

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Abstract The main aim of this work was to study the effect of time and method of Al, SiC powders mixing on the microstructure and mechanical properties of composites. Moreover, the influence of applicating direct extrusion with a reversibly rotating die on the homogeneity of the composites was examined. Microstructure observations with the use of an optical microscope and scanning electron microscope were applied. A quantitative analysis of composite microstructure was conducted. The density (helium pycnometer method), Vickers hardness and the Young’s Modulus of the composites were also determined. The results show that the homogeneity of Al/SiC composites rises with an increase of mixing time. However, better results were obtained by application of high energy ball milling process.

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40

Sobina, Egor P., and Ilya P. Aronov. "Development of certified reference materials set for opened porosity of solid substances and materials." Izmeritel`naya Tekhnika, no. 3 (2021): 58–66. http://dx.doi.org/10.32446/0368-1025it.2021-3-58-66.

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The article deals with data of research for development of certified reference materials set for opened porosity of solid substances and materials (imitators) (OPGP SO UNIIM set) GSO 11116-2018/GSO 11119-2018. The certified values of open porosity are determined using a gas pycnometer. Certified reference materials are intended for certification of measurement techniques and control of the accuracy of open porosity measurement results for petrophysical studies of core. Certified reference materials can be used for calibration, verification of open porosity measurements of rock and for testing of measuring instruments. A complete budget of the CRM uncertainty is presented, taking into account changes in ambient temperature when it used in testing and calibration laboratories.

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41

Tamari, S. "Optimum design of the constant-volume gas pycnometer for determining the volume of solid particles." Measurement Science and Technology 15, no. 3 (February 9, 2004): 549–58. http://dx.doi.org/10.1088/0957-0233/15/3/007.

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42

Tamari, S., and A. Aguilar-Chávez. "Optimum design of the variable-volume gas pycnometer for determining the volume of solid particles." Measurement Science and Technology 15, no. 6 (May 14, 2004): 1146–52. http://dx.doi.org/10.1088/0957-0233/15/6/015.

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Bauer, Thomas, Doerte Laing, and Rainer Tamme. "Overview of PCMs for Concentrated Solar Power in the Temperature Range 200 to 350°C." Advances in Science and Technology 74 (October 2010): 272–77. http://dx.doi.org/10.4028/www.scientific.net/ast.74.272.

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Thermal energy storage is an essential advantage of solar thermal power plants. The present paper focuses on latent heat storage using a phase change material (PCM). The paper lists literature and gives the current status of PCM work in the temperature range 200 to 350 °C. The system KNO3-NaNO3 is discussed in detail in terms of their thermo-physical properties in the liquid and solid phase. A comparison of literature data and own measurements for the density, heat capacity, thermal diffusivity and thermal conductivity is presented. Measurement results with the following methods are discussed: helium pycnometer, differential scanning calorimeter (DSC) and laser flash. Missing data of the thermal diffusivity and thermal conductivity are partly supplemented. Consistent thermo-physical properties in the liquid phase are presented.

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Hill, Callum A. S., and Graham A. Ormondroyd. "Dimensional changes in Corsican pine (Pinus nigra Arnold) modified with acetic anhydride measured using a helium pycnometer." Holzforschung 58, no. 5 (August 1, 2004): 544–47. http://dx.doi.org/10.1515/hf.2004.082.

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Abstract Helium pycnometry was used to determine the changes in volume of wood samples of Corsican pine following modification with acetic anhydride. Results were compared with changes in volume determined from external dimensions only. Percentage change in volume, as determined from external dimensions of the sample, showed a non-linear relationship with weight percentage gain as a result of acetylation; whereas percentage volume change determined by helium pycnometry showed a linear relationship. The difference in volume as determined by the two methods is explained by considering volume change of the lumens as level of cell wall substitution increases. Results obtained in this study show that volume increases due to chemical modification, when determined by measurement of external dimensions, should not be used to evaluate changes in cell wall volume.

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Lee, Yong Jae, Woo Gab Lee, Mohammed Abdurahman Mohammed, Yon-Kyu Park, and Chae Yoon Oh. "New Method of Volume Measurement for Reference Weights of a Pressure Balance Using a Gas Pycnometer." Journal of the Korean Vacuum Society 22, no. 5 (September 30, 2013): 231–37. http://dx.doi.org/10.5757/jkvs.2013.22.5.231.

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Mohamed Roshan, M., and G. Roy Richi Renold. "Microscope Supported Measurement of Exact Volume of Solutions in Pycnometer to Calculate the Density of Solutions." International Journal of Advances in Interdisciplinary Research 4, no. 3 (September 30, 2017): 20. http://dx.doi.org/10.29191/ijaidr.2017.4.3.04.

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Berthe, L., C. Druilhe, C. Massiani, A. Tremier, and A. de Guardia. "Coupling a respirometer and a pycnometer, to study the biodegradability of solid organic wastes during composting." Biosystems Engineering 97, no. 1 (May 2007): 75–88. http://dx.doi.org/10.1016/j.biosystemseng.2007.01.013.

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Gnanasekharan, V., M. S. Chinnan, and J. W. Dorner. "Methods for Characterization of Kernel Density and Aflatoxin Levels of Individual Peanuts1." Peanut Science 19, no. 1 (January 1, 1992): 24–28. http://dx.doi.org/10.3146/i0095-3679-19-1-6.

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Abstract A helium pycnometer, specific gravity bottle and a displacement method were evaluated for the determination of individual peanut (Arachis hypogaea L.) kernel densities. Three coating materials were tested to minimize water absorption with the latter two methods. The displacement technique with a coefficient of variation (CV) of less than 0.1% was found to be most reproducible and had a total variability of 0.002 g/cm3. Polyurethane was adopted as the coating material of choice. A reverse phase High Performance Liquid Chromatography (HPLC) assay was adapted for quantification of the aflatoxins in individual peanuts. Picogram levels of aflatoxin were quantified with an average recovery of 82%. Characterization of peanut kernel density distributions and relationships between kernel density and aflatoxin level are envisioned with data generated using this method.

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Rathi, Meenakshi Virendra. "Comparative Study of Solvation Behaviour of Oxidising Agents Like Kclo3, Kbro3 and KIO3 in Aqueous Solvent Systems at Different Temperatures." Oriental Journal Of Chemistry 37, no. 1 (February 28, 2021): 151–56. http://dx.doi.org/10.13005/ojc/370120.

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The investigation of the solvationtrend of oxidizing agents like KClO3, KBrO3 and KIO3as electrolytes in aqueous salt solution rendersthe datasuited to interpret ion–ion, solute–solvent, ion-solvent and solvent–solvent interactions and synergy. Apparent molar volumes (∅_V) and viscosity B-coefficients for KClO3, KBrO3 and KIO3solutions in aqueous 0.5 % KCl ,system have been calculated from density (ρ) and viscosity (η) measurements at 298.15 to 313.15 K using a calibrated bicapillary pycnometer and the simple, yet accurate apparatus known as Ubbelohde viscometer respectively. Jones-Dole equation,Masson’s equation, Roots equation and Moulik’s equations are implemented to analyse various interactions inter and intra ionic attractions among the ion–ion, ion–solvent, and solute–solvent. Additionallythe apparent molar volumes of transfer Δ ∅(tr) and Rate constant diffusion controlled reaction (kd)are valuated.

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Magalhães, Aldo G., Fernando José Silva, M. A. P. Rezende, White J. Santos, E. V. M. Carrasco, J. N. R. Mantilla, and E. M. Piancastelli. "The Influence of the Water/Cement Ratio in the Open Porosity and in the Carbonation Front Advancing in Cementitious Matrix Composites." Applied Mechanics and Materials 864 (April 2017): 313–17. http://dx.doi.org/10.4028/www.scientific.net/amm.864.313.

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In this study involving cementitious matrix composites, the influence of the water/cement (w/c) ratio variation (0.48, 0.60, 0.70 and 0.75) was analyzed in its open pore structure and in the carbonation front advancing. Test specimens were molded in cylindrical dimensions of (5x10) cm and (2x4) cm for each mix proportions, and subjected into accelerated carbonation tests, at controlled exposure conditions. The open porosity of the material was obtained by using a helium pycnometer. A model based on Fick's second law was used to fit an equation to the curve of progress of the carbonation front over time. The results show that the water/cement ratio can highly influence the analyzed properties; the mathematical model used provided an excellent approximation of the advancing carbonation front trend, allowing a good evaluation of the carbonation coefficient (K) associated to each mixture proportioning.

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