Bibliografías temáticas / Gravimetrisk metod

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Literatura académica sobre el tema "Gravimetrisk metod"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Gravimetrisk metod"

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Noviyanty, Yuska Noviyanty, Herlina Herlina y Cahyan Fazihkun. "IDENTIFICATION AND DETERMINATION OF SAPONIN LEVELS FROM BIDURROT EXTRACT (Calotropis gigantea L) USING GRAVIMETRY METHOD". Journal of Pharmaceutical And Sciences 3, n.º 2 (31 de diciembre de 2020): 100–105. http://dx.doi.org/10.36490/journal-jps.com.v3i2.52.

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Biduri plants (Calotropis gigantea L) are used as medicinal plants, namely as cough and anti-allergic medicines. Research conducted by (Suchita Siggn. 2014) shows the presence of glycoside compounds, saponins, alkaloids, flavonoids, and tannins. then the researchers are interested in carrying out research on the identification and determination of saponin levels from the extract of the baby root (Calotropis gigantea L) by the Gravimetri method. Qualitative test was carried out by inserting 500 mg of biduri root extract (Calotropis gigantea L) into a test tube, then adding 10 ml of hot water, shaking vigorously for 10 seconds and adding HCL, then a quantitative test was carried out using the gravimetric method. Based on the results of research that has been carried out the extract of the betel root (Calotropis gigante L) positive containing saponin compounds with saponin content is 2.6% with a weight of 1.16 gram saponins using the gravimetric method
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Noviyanty, Yuska Noviyanty, Herlina Herlina y Cahyan Fazihkun. "IDENTIFICATION AND DETERMINATION OF SAPONIN LEVELS FROM BIDURROT EXTRACT (Calotropis gigantea L) USING GRAVIMETRY METHOD". Journal of Pharmaceutical And Sciences 3, n.º 2 (31 de diciembre de 2020): 100–105. http://dx.doi.org/10.36490/journal-jps.com.v3i2.52.

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Biduri plants (Calotropis gigantea L) are used as medicinal plants, namely as cough and anti-allergic medicines. Research conducted by (Suchita Siggn. 2014) shows the presence of glycoside compounds, saponins, alkaloids, flavonoids, and tannins. then the researchers are interested in carrying out research on the identification and determination of saponin levels from the extract of the baby root (Calotropis gigantea L) by the Gravimetri method. Qualitative test was carried out by inserting 500 mg of biduri root extract (Calotropis gigantea L) into a test tube, then adding 10 ml of hot water, shaking vigorously for 10 seconds and adding HCL, then a quantitative test was carried out using the gravimetric method. Based on the results of research that has been carried out the extract of the betel root (Calotropis gigante L) positive containing saponin compounds with saponin content is 2.6% with a weight of 1.16 gram saponins using the gravimetric method
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DEME, I. "AVALIAÇÃO DA INCERTEZA DE MEDIÇÃO NA CALIBRAÇÃO DE MEDIDOR DE VAZÃO DE LÍQUIDOS PELO MÉTODO GRAVIMÉTRICO". Revista SODEBRAS 15, n.º 174 (junio de 2020): 99–101. http://dx.doi.org/10.29367/issn.1809-3957.15.2020.174.99.

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Chrastina, J., L. Staroňová, I. Vitázek y M. Pšenka. "Analysis of residual biomass of liquid biofuels using gravimetric method and combustion heat". Research in Agricultural Engineering 61, Special Issue (2 de junio de 2016): S21—S25. http://dx.doi.org/10.17221/22/2015-rae.

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The using possibilities of secondary raw materials produced during the liquid biofuels production such as bioethanol and biodiesel, and also those produced during solid fuel production was determined. The study presents combustion of distiller’s dried grain with solubles (DDGS) and pressing refuse of rapeseed methyl ester (RME). The combustion was done in gravimetric oven, according to the standards, under the laboratory conditions. Combustion heat of samples was measured with calorimeter IKA C5000. The results show the average combustion heat of 20.91 MJ/kg for DDGS and 18.996 MJ/kg for RME. Results are chronologically presented in tables and figures.
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Zhang, Xi Ming y Xue Li. "Gravimetric Method for Calibrating Flow Meter". Applied Mechanics and Materials 501-504 (enero de 2014): 2335–37. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.2335.

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What the earth obtain the energy annually is ten thousand times of the earth energy consumption at present,but the solar energy has a lower energy density on the earth’s surface .solar energy is the main source of all energy The experimental research was conducted for the heating performance utilizing the solar-assisted heat pump experimental platform. Experimental errors will be caused to flow meter by different measured media and long time usage In order to improve measurement precision and reduce the experimental errors, this test use gravimetric method to calibrate the LZB glass rotor meter and MCE08-787 cumulative flow meter of indoors and outdoors pipes. The paper also presents flow correction coefficient to guarantee both the accuracy and reliability of the experimental results.
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Rahman, Azman Ab, Hafidzi Hamdan, Dg Nooremah Ag Said y Abdul Rahman Mohamed. "Determination of Mudd Volume Using Gravimetric Method". Advanced Science Letters 23, n.º 5 (1 de mayo de 2017): 4557–59. http://dx.doi.org/10.1166/asl.2017.8903.

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Vecellio None, Laurent, Daniel Grimbert, Joelle Bordenave, Guy Benoit, Yves Furet, Brigitte Fauroux, Eric Boissinot, Michele De Monte, Etienne Lemarié y Patrice Diot. "Residual Gravimetric Method to Measure Nebulizer Output". Journal of Aerosol Medicine 17, n.º 1 (marzo de 2004): 63–71. http://dx.doi.org/10.1089/089426804322994479.

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Rosenberger, Franz, J. Iwan, D. Alexander y Wei‐qing Jin. "Gravimetric capillary method for kinematic viscosity measurements". Review of Scientific Instruments 63, n.º 9 (septiembre de 1992): 4196–99. http://dx.doi.org/10.1063/1.1143234.

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Zhou, X., B. Zhong y X. Li. "Gravimetric terrain corrections by triangular‐element method". GEOPHYSICS 55, n.º 2 (febrero de 1990): 232–38. http://dx.doi.org/10.1190/1.1442831.

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Terrain corrections for gravity data are a critical concern in rugged topography, because the magnitude of the corrections may be large relative to the anomalies of interest. The terrain‐correction process, however, is very tedious. At present, rectangular prism and fan‐shaped prism methods are commonly used for the corrections; but these methods assume elements have horizontal tops, an assumption which does not reflect true topography, especially near the station. A triangular‐element method which allows dipping surfaces has been developed using a Gaussian formulation to improve the correction process. This method involves a simple formula employing a surface rather than a volume integral for computing the terrain corrections with high accuracy.
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Martinsen, Ørjan G., Sverre Grimnes, Jon K. Nilsen, Christian Tronstad, Wooyoung Jang, Hongsig Kim, Kunsoo Shin, Majid Naderi y Frank Thielmann. "Gravimetric Method forin VitroCalibration of Skin Hydration Measurements". IEEE Transactions on Biomedical Engineering 55, n.º 2 (febrero de 2008): 728–32. http://dx.doi.org/10.1109/tbme.2007.912651.

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Tesis sobre el tema "Gravimetrisk metod"

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Gellerstedt, Jennifer y Simon Westman. "Sambandet mellan radarsignaler och fukthalt i en lättbetongkonstruktion". Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24203.

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Fukt i byggnader är vanligt och kan leda till skador. Fukten kan ge upphov till mögel och röta, vilket inte är bra för människors hälsa. Fukten kan också påverka olika egenskaper hos byggnadsmaterialen såsom hållfasthet, värmeisoleringsförmåga och ge dimensionsförändringar. Eftersom höga fukthalter kan ha en stor påverkan på materialen är det viktigt att upptäcka och fastställa problemet i ett tidigt skede. Syfte och mål med den här rapporten är att se om det finns ett samband mellan radarsignaler och fukthalt och avgöra om radarteknik är en användbar metod för att mäta fukthalt i ett byggnadselement. I det här arbetet har litteraturstudier, mätningar och analyser gjorts. Materialet som använts är lättbetong som byggts upp till fyra väggar i två olika tjocklekar, två stora och två små väggar. De stora testväggarna användes för radarmätningar och de små som provväggar till den gravimetriska metoden. Väggarna byggdes upp i ett tält där relativa luftfuktigheten (RF) och temperatur kunde styras. I början av experimentet var RF i tältet inställt på 98-99 % och temperaturen på 22 °C som därefter reglerats för att torka ut väggarna. Mätningar har utförts med radar och den gravimetriska metoden parallellt, där den sistnämnda gjorts genom att väga provväggarnas lättbetongblock vid samma tillfällen som radarmätningarna. Provväggarnas lättbetongblock torkades därefter i torkningsugn i 105 °C för att fastställa dess torrdensitet. Insamlade data från radarmätningarna har bearbetats av Radarbolagets personal. Resultaten för de olika metoderna har därefter analyserats och jämförts för att se om det finns ett samband. Resultaten från studien visar att det finns ett samband mellan fukthalt och signalerna från radarmätningarna. Fukthalten kan bestämmas på en lättbetongvägg med en felmarginal på ± 4 kgH20/m3 material, vilket motsvarar cirka 4 %. Det går att få ett bra resultat med radarmätning, metoden är däremot komplicerad men det kan finnas värde för fortsatta studier på flerskiktade konstruktioner för att avgöra om tekniken kan vara användbar för befintliga byggnadskonstruktioner.
Moisture in buildings is common and can lead to damage. The moisture can cause moldand rot, which is not good for human health. The moisture can also affect different properties of the building materials such as strength, thermal insulation and dimensional changes. Because high moisture levels can have a major impact on the materials, it is important to detect and fix the problem at an early stage. The purpose and aim of this report is to see if there is a correlation between radar and moisture content and determine whether radar technology is a useful method of measuring moisture contentin a building element. In this work, literature studies, measurements and analyzes have been made. The material used is lightweight concrete that is built up to four walls in two different thicknesses, two large and two small walls. The large test-walls were used for radar measurements and the small ones as sample-walls for the gravimetric method. The walls were built in a tent where relative humidity (RF) and temperature could be controlled. At the beginning of the experiment, the RF in the tent was set to 98-99 % and the temperature of 22 °C, which was then regulated to dry out the walls. Measurements have been made with radar and the gravimetric method in parallel, where the latter was made by weighing the sample-walls light concrete blocks at the same time as the radar measurements. The blocks of the sample walls were then dried in an oven at 105 °C to determine drydensity. The collected data from the radar measurements have been processed by the Radarbolaget’s personnel. The results for the different methods have then been analyzed and compared to see if there is a relationship. The results from the study show that there is a connection between moisture content and the signals from the radar measurements. The moisture content can be determined on a light concrete wall with a margin of error of ± 4 kgH20/m3material, which corresponds to about 4 %. It is possible to get a good result with radar measurement. However, the method is complicated, but there may be value for further studies on multilayered structures to determine whether the technology can be useful for existing building constructions.
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Cavalheiro, Mara Lia Dias. "Levantamento gravimétrico na Jazida Carbonífera Morungava-Chico Lomã, RS". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/150209.

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A presente dissertação foi desenvolvida conforme a norma 103 do Programa de Pós Graduação em Geociências da Universidade Federal do Rio Grande do Sul, que prevê a submissão da dissertação de mestrado em forma de artigo, antecedido de estado da arte do tema proposto. Na região sudeste da Bacia do Paraná estão localizados depósitos de carvão economicamente importantes nos estados do Paraná, Santa Catarina e Rio Grande do Sul. Esses depósitos são frequentemente muito alterados por intrusões vulcânicas. O objetivo principal desse estudo é mapear essas intrusões ígneas que afetam o nível de alteração térmica do carvão (rank) da Jazida carbonífera Morungava-Chico Lomã no RS. A Jazida Morungava-Chico Lomã foi descoberta no século passado e nunca foi minerada. É caracterizada por rochas orgânicas do Permiano, carvão e folhelho betuminoso, na porção sul da Bacia do Paraná. A aquisição gravimétrica foi realizada na área do depósito Morungava e na área do depósito Chico-Lomã. Para ambas a escolha dos locais de aquisição foi baseada em furos de sondagem anteriormente realizados. Com os dados dos furos de sondagem foram elaborados seguintes mapas temáticos: profundidade da primeira ocorrência de carvão; espessura cumulativa do carvão; profundidade da primeira ocorrência de diabásio; espessura cumulativa do diabásio; espessura cumulativa do diabásio na Formação Irati e espessura cumulativa do diabásio na Formação Rio Bonito. Na elaboração do artigo submetido foi realizada a sobreposição das isolinhas das espessuras cumulativa do carvão e do diabásio nos mapas de anomalia Bouguer filtrados. Essas sobreposições apresentaram correlações e auxiliaram na interpretação dos dados gravimétricos. A orientação preferencial predominante das anomalias foi NE-SW e uma orientação subsidiária de direção NW-SE, o que sugeriu um controle estrutural sobre a ocorrência de diques e/ou soleiras, sob os altos gravimétricos. Em Chico Lomã a ocorrência de uma extensa anomalia Bouguer positiva formando um trend de orientação NE-SW foi correlacionada a unidades geológicas da Planície Costeira do Rio Grande do Sul: altos gravimétricos caracterizaram a Barreira I e baixos gravimétricos, os Sistemas Lagunares I e II. O método gravimétrico se mostrou eficaz para a caracterização da jazida por meio da correlação de anomalias gravimétricas positivas com as ocorrências de diabásio.
The present dissertation was developed according to standard 103 of the Graduate Program in Geosciences of the Federal University of Rio Grande do Sul, which provides for the submission of the dissertation in the form of article, predates by state of the art proposed theme. In the southeastern region of the Paraná Basin are located economically important coal deposits in the states of Parana, Santa Catarina and Rio Grande do Sul. These deposits are often much altered by volcanic intrusions. The objective of this study is to map the igneous intrusions affecting the thermal change of level of coal (rank) of the coal deposit Morungava-Chico Lomã in RS. The coal deposit Morungava-Chico Lomã was discovered in the last century and has never been mining. It is characterized by organic rocks of the Permian, coal and bituminous shale, in the southern portion of the Paraná Basin. The gravimetric acquisition was carried in área of the deposit Morungava and in the area of the deposit Chico-Lomã. For both areas the choice of acquisition locations was based on previously conducted drilling holes. With data from the holes drilling were prepared these thematic maps: depth of the first occurrence of coal; cumulative thickness of coal; depth of the first occurrence of diabase; cumulative thickness of diabase; cumulative thickness of diabase in Irati Formation and cumulative thickness of the diabase in Rio Bonito Formation. In the elaboration of article submitted the overriding of the isolines of cumulative thickness of coal and diabase in the filtered Bouguer anomaly maps was performed. These overrides presented correlations and assisted in the interpretation of gravity data. The predominant preferential orientation of the anomalies was NE-SW and a subsidiary orientation NW-SE direction, suggesting a structural control on the occurrence of dikes and/or sills, on gravimetric high. In Chico Lomã the occurrence of an extensive positive Bouguer anomaly forming a trend of NE-SW orientation was correlated with geological units of Rio Grande do Sul Coastal Plain: gravimetric characterized the high Barrier I and low gravimetric, Systems Lagunar I and II. The gravimetric method proved efficient for the characterization of the deposit through the correlation of positive gravity anomalies with occurrences of diabase.
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Danila, Uliana. "Mold2012 : a new gravimetric quasigeoid model over Moldova". Licentiate thesis, KTH, Geodesi och geoinformatik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105755.

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In order to be able to use the operational Moldavian GNSS Positioning System MOLDPOS efficiently for the determination of normal heights in surveying engineering, e.g. during the construction of a road, an accurate quasigeoid model is needed. The main goal of this thesis is to present a new gravimetric quasigeoid model for Moldova (Mold2012), which has been determined by applying the Least Squares Modification of Stokes’ formula with Additive corrections (LSMSA), also called the KTH method. Due to limited coverage of gravity data, the integration area is often limited to a small spherical cap around the computation point, which leads to a truncation error for geoid height. Molodensky et al. (1962) showed that the truncation error can be reduced by the modification of Stokes’ formula, where the measured gravity data are combined with the low-frequency component of the geoid from a Global Gravitational Model (GGM). The LSMSA technique combines the GGM and the terrestrial data in an optimum way. In order to find the most suitable modification approach or cap size it is necessary to compare the gravimetric height anomalies with the GPS/levelling derived height anomalies, and for this purpose we use a GPS/levelling dataset that consists of 1042 points with geodetic coordinates in the MOLDREF99 reference system and normal heights at the same points given in the height system Baltic 77. The magnitude of the additive corrections varies within an interval from -0.6 cm to -4.3 cm over the area of Moldova. The quasigeoid model which results from combining the ITG-Grace02s solution (with n = M = 170, ψ0 = 3° and σΔg = 10 mGal) and the solution obtained from the modified Stokes’ formula together with the additive correction gives the best fit for the GPS/levelling data with a standard deviation (STD) of ±7.8 cm. The evaluation of the computed gravimetric quasigeoid is performed by comparing the gravimetric height anomalies with the GPS/levelling derived height anomalies for 1042 points. However, the above heterogeneous data include outliers, and in order to find and eliminate these, a corrector surface model is used. This surface provides a connection to the local vertical when the GNSS technique is used. After the elimination of the suspicious outliers (170 points) according to a 2-RMS test, a new corrective surface was computed based on the remaining 872 GPS/levelling points, and the STD of residuals became ±4.9 cm. The STD value for the residuals according to the order of the levelling network for the Mold2012 fitted to the local vertical datum is 3.8 cm for the I-order, 4.3 cm for the II-order, 4.5 cm for the III-order and 5.0 cm for the IV-order levelling network. But the STD of the residuals for the 18 control points indicates a better result where the STD is 3.6 cm and RMS is 3.9 cm and the min and max value of residuals is -5.3 cm and 9.0 cm, respectively. As the STD of the differences in height anomaly are not just the standard error of the height anomalies (quasigeoid model), but it contains also the standard errors of GPS heights and of normal heights. Assuming that the latter STDs are 3 cm and 3.5 cm, respectively, the STD of Mold2012 is estimated to 1.7 cm.

QC 20121127

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Inerbayeva, (Shoganbekova) Daniya. "Determination of a gravimetric geoid model of Kazakhstan using the KTH-method". Thesis, KTH, Geoinformatik och Geodesi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-52284.

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This study work deals with the determination of the gravimetric geoid model for Kazakhstan by using the KTH-method. A number of data sets were collected for this work, such as the gravity anomalies, high-resolution Digital Elevation Model (DEM), Global Geopotential Models (GGMs) and GPS/Levelling data. These data has been optimally combined through the KTH approach, developed at the Royal Institute of Technology (KTH) in Stockholm. According to this stochastic method, Stokes’ formula is being used with the original surface gravity anomaly, which combine with a GGM yields approximate geoid heights. The corrected geoid heights are then obtained by adding the topographic, downward continuation, atmospheric and ellipsoidal corrections to the approximate geoid heights. To compute the geoid model for Kazakhstan as accurately as possible with available data set different numerical tests have been performed: Choice of the best fit geopotential model in the computation area Investigations for the best choice of the initial condition for determination of the least-squares parameters Selection of the best parametric model for reducing the effect of the systematic error and data inconsistencies between computed geoid heights and GPS/Levelling heights.  Finally, 5'x5' Kazakh gravimetric geoid (KazGM2010) has been modelled.
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Akhtar, Nahid. "A multiscale harmonic spline interpolation method for the inverse spheroidal gravimetric problem". Aachen Shaker, 2009. http://d-nb.info/1000335380/04.

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Yürekli, Yılmaz Alsoy Altınkaya. "Measurement of transport properties of polyacrylic systems using a gravimetric sorption method/". [s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000274.pdf.

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Abdalla, Ahmed. "Determination of a gravimetric geoid model of Sudan using the KTH method". Thesis, KTH, Geodesi och satellitpositionering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199670.

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The main objective of this study is to compute a new gravimetric geoid model of Sudan using the KTH method based on modification of Stokes’ formula for geoid determination. The modified Stokes’ formula combines regional terrestrial gravity with long-wavelength gravity information provided by the global gravitational model (GGM). The collected datasets for this study contained the terrestrial gravity measurements, digital elevation model (DEM), GPS/levelling data and four global gravitational Models (GGMs), (EGM96, EIGEN-GRACE02S, EIGEN-GL04C and GGM03S). The gravity data underwent cross validation technique for outliers detection, three gridding algorithms (Kriging, Inverse Distance Weighting and Nearest Neighbor) have been tested, thereafter the best interpolation approach has been chosen for gridding the refined gravity data. The GGMs contributions were evaluated with GPS/levelling data to choose the best one to be used in the combined formula. In this study three stochastic modification methods of Stokes’ formula (Optimum, Unbiased and Biased) were performed, hence an approximate geoid height was computed. Thereafter, some additive corrections (Topographic, Downward Continuation, Atmospheric and Ellipsoidal) were added to the approximated geoid height to get corrected geoid height. The new gravimetric geoid model (KTH-SDG08) has been determined over the whole country of Sudan at 5′ x 5′ grid for area ( 4 ). The optimum method provides the best agreement with GPS/levelling estimated to 29 cm while the agreement for the relative geoid heights to 0.493 ppm. A comparison has also been made between the new geoid model and a previous model, determined in 1991 and shows better accuracy. 􀁄 ≤φ ≤ 23􀁄 , 22􀁄 ≤ λ ≤ 38􀁄 Keywords: geoid model, KTH method, stochastic modification methods, modified Stokes’ formula, additive corrections.
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Daras, IIias. "Determination of a gravimetric geoid model of Greece using the method of KTH". Thesis, KTH, Geodesi och satellitpositionering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199682.

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The main purpose of this study is to compute a gravimetric geoid model of Greeceusing the least squares modification method developed at KTH. In regional gravimetricgeoid determination, the modified Stokes’s formula that combines local terrestrial datawith a global geopotential model is often used nowadays.In this study, the optimum modification of Stokes’s formula, introduced by ProfessorSjöberg, is employed so that the expected mean square error (MSE) of all possiblesolutions of the general geoid model is minimized. According to this stochasticmethod, the Stokes’s formula is being used with the original surface gravity anomalywhich combined with a GGM yields an approximate geoid height. The corrected geoidheight is then obtained by adding the topographic, downward continuation,atmospheric and ellipsoidal corrections to the approximate geoid height.The dataset used for the computations, consisted of terrestrial gravimetricmeasurements, a DEM model and GPS/Levelling data for the Greek region. Threeglobal geopotential models (EGM96, EIGEN-GRACE02S, EIGEN-GL04C) weretested for choosing the best GGM to be combined into the final solution. Regarding theevaluation and refinement of the terrestrial gravity measurements, the cross-validationtechnique has been used for detection of outliers.The new Greek gravimetric geoid model was evaluated with 18 GPS/Levelling pointsof the Greek geodetic network. The absolute agreement between the gravimetric andthe GPS/Levelling geoid height was estimated at 27 cm while the relative agreement at0.9 ppm. In a case of study the absolute accuracy of the model was estimated at 14 cm.The geoid model computed in this study was also compared with some previous Greekgeoid models, yielding better external accuracy than them.
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Akhtar, Nahid [Verfasser]. "A Multiscale Harmonic Spline Interpolation Method for the Inverse Spheroidal Gravimetric Problem / Nahid Akhtar". Aachen : Shaker, 2010. http://d-nb.info/1124365478/34.

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Ssengendo, Ronald. "A height datum for Uganda based on a gravimetric quasigeoid model and GNSS/levelling". Doctoral thesis, KTH, Geodesi och satellitpositionering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172547.

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This study is devoted to the determination of a high resolution gravimetric geoid model for Uganda based on the optimal combination of terrestrial and satellite gravity anomalies using the method of Least Squares Modification of Stokes’ formula with additive corrections. Specifically the study investigates the current status of the existing Uganda Vertical Network relative to the requirements of a modern height datum and includes a detailed evaluation and validation of terrestrial gravity data, several digital elevation models and some recent global geopotential models. Finally a new height datum based on a gravimetric quasigeoid model and Global Navigation Satellite Systems (GNSS)/levelling is proposed. In this thesis, the Uganda Gravimetric Geoid Model 2014 (UGG2014) is computed from several datasets which, include 7839 terrestrial gravity data points from the International Gravimetric Bureau, the 3 arc second Shuttle Radar Topography Mission digital elevation model and a recent Gravity field and steady-state Ocean Circulation Explorer-only global geopotential model. To compensate for the missing gravity data in the target area, the surface gravity anomalies extracted from the World Gravity Map 2012 were used. Outliers in the terrestrial gravity data were detected using the cross-validation technique which, also estimated the accuracy of the remaining terrestrial gravity data as 9 mGal. Based on 12 GNSS/levelling data points distributed over Uganda, the root mean square fit of UGG2014 before and after the 4-parameter fit is 16 cm and 9 cm, respectively. The study has revealed that the heights of the Uganda Vertical Network are normal-orthometric heights for which the quasigeoid is the closest approximation to the zero reference surface. Consequently, the Uganda Gravimetric Quasigeoid Model 2014 (UGQ2014) was derived from the UGG2014 with the quasigeoid-geoid separation computed from the Earth Gravitational Model 2008 complete to degree/order 2160 of spherical harmonics. The root mean square fit of UGQ2014 versus GNSS/levelling is 15 cm and 8 cm before and after the 4-parameter fit, respectively, which shows that the quasigeoid model fits GNSS/levelling better than the geoid model. Thus a new height datum based on UGQ2014 and GNSS/levelling was determined as a practical solution to the determination of heights directly from GNSS. Evaluated with 4 independent GNSS/levelling points, the root mean square fit of the new height datum is 5 cm better than using the quasigeoid model alone. With an average parts-per-million of 29 in the relative test, the new height datum satisfies the precision and accuracy requirements of third order precise levelling. Overall, the results show that UGG2014 and UGQ2014 agree considerably better with GNSS/levelling than any other recent regional/global gravimetric geoid models. Therefore, both gravimetric solutions are a significant step forward in the modelling of a “1-cm geoid” over Uganda given the poor quality and quantity of the terrestrial gravity data used for computation.

QC 20150831

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Libros sobre el tema "Gravimetrisk metod"

1

Institution, British Standards. Milk: Determination of fat content : gravimetric method (reference method). London: British Standards Institution, 1995.

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Kerimov, I. A. Metod F-approksimat︠s︡ii pri reshenii zadach gravimetrii i magnitometrii. Moskva: Fizmatlit, 2011.

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Priblizhennye metody reshenii͡a︡ pri͡a︡mykh i obratnykh zadach gravimetrii. Moskva: "Nauka," Glav. red. fiziko-matematicheskoĭ lit-ry, 1987.

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Bibawy, Nabil A. An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen. Washington, DC: Dept. of the Interior, 1990.

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Bibawy, Nabil A. An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen. Washington, DC: United States Dept. of the Interior, Bureau of Mines, 1990.

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Laboratory, Occupational Medicine and Hygiene. Rubber fume in air measured as 'total particulates' and 'cyclohexane soluble material': Laboratory method using filters and gravimetric estimation. Bootle: Health and Safety Executive, 1987.

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Laboratory, Occupational Medicine and Hygiene. Coal tar pitch volatiles: measurement of particulates and cyclohexane soluble materialin air: Laboratory method using filters and gravimetric estimation. Bootle: Health and Safety Executive, 1990.

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Occupational Medicine and Hygiene Laboratory. Newspaper print rooms: measurement of total particulates and cyclohexane soluble material in air: Laboratory method using filters and gravimetric estimation. Bootle: Health and Safety Executive, 1987.

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N, Strakhov V. y Obʺedinennyĭ institut fiziki Zemli im. O.I︠U︡. Shmidta., eds. Metody reshenii︠a︡ t︠s︡entralʹnoĭ vychislitelʹnoĭ zadachi gravimetrii, magnitometrii, geodezii i geoinformatiki: Sbornik nauchnykh stateĭ. Moskva: Institut fiziki Zemli im. O.I︠U︡. Shmidta RAN, 2007.

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N, Strakhov V. y Obʺedinennyĭ institut fiziki Zemli im. O.I︠U︡. Shmidta., eds. Metody reshenii︠a︡ t︠s︡entralʹnoĭ vychislitelʹnoĭ zadachi gravimetrii, magnitometrii, geodezii i geoinformatiki: Sbornik nauchnykh stateĭ. Moskva: Institut fiziki Zemli im. O.I︠U︡. Shmidta RAN, 2007.

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Capítulos de libros sobre el tema "Gravimetrisk metod"

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Lowell, S. y Joan E. Shields. "Gravimetric method". En Powder Surface Area and Porosity, 202–5. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7955-1_18.

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Alarie, Jonathan, Thomas Roger, László I. Kiss, Sándor Poncsák, Sébastien Guérard y Jean-François Bilodeau. "Validation of the Gravimetric Method to Properly Follow Alumina Dissolution in Cryolitic Bath". En Light Metals 2020, 680–87. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36408-3_92.

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Daras, I., H. Fan, K. Papazissi y J. D. Fairhead. "Determination of a Gravimetric Geoid Model of Greece Using the Method of KTH". En Gravity, Geoid and Earth Observation, 407–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_54.

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"Gravimetric Method". En Soil Water Measurement, 26–42. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119106043.ch6.

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Technical, AACC. "Phosphorus--Gravimetric Method". En AACC International Approved Methods. AACC International, 2009. http://dx.doi.org/10.1094/aaccintmethod-40-57.01.

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Technical, AACC. "Sulfates--Gravimetric Method". En AACC International Approved Methods. AACC International, 2009. http://dx.doi.org/10.1094/aaccintmethod-40-66.01.

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Korotcenkov, Ghenadii. "Gravimetric Method of Humidity Measurement". En Handbook of Humidity Measurement, 17–21. CRC Press, 2019. http://dx.doi.org/10.1201/b22370-2.

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Technical, AACC. "Total Dietary Fiber--Rapid Gravimetric Method". En AACC International Approved Methods. AACC International, 2009. http://dx.doi.org/10.1094/aaccintmethod-32-06.01.

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Technical, AACC. "Cinder and Sand Particles in Farina--Gravimetric Method". En AACC International Approved Methods. AACC International, 2009. http://dx.doi.org/10.1094/aaccintmethod-28-07.01.

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Technical, AACC. "Chlorides in Ash as Sodium Chloride--Gravimetric Method". En AACC International Approved Methods. AACC International, 2009. http://dx.doi.org/10.1094/aaccintmethod-40-30.01.

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Actas de conferencias sobre el tema "Gravimetrisk metod"

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Ranieri, G., R. Balia y G. P. Deidda. "Using gravimetric method in territorial planning". En 4th EEGS Meeting. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609.201407148.

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de Lima Ribeiro, Kamilla, Fernanda Oliveira Silva, Caterina Elena De Santis y Akira Luiz Nakamura. "Determination of Fuel Contamination in Lubricant Oil Through Gravimetric Method". En SAE 2013 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2013. http://dx.doi.org/10.4271/2013-01-0332.

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LeBlanc, Jeffrey R. y Marco J. Castaldi. "A Proposed Method for Reliable Gasification Kinetics by Thermal Gravimetric Analysis". En 2013 21st Annual North American Waste-to-Energy Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/nawtec21-2704.

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It has been shown in thermodynamic simulations of gasification that recycling up to 25% of carbon dioxide (CO2) into a reformer allows for a highly hydrogen (H2) concentrated syngas. While understanding thermodynamic limits is imperative, a kinetic analysis is desired to confirm applicability. Studies on thermal decomposition kinetics of polyethylene terephthalate (PET) in CO2 gasification atmosphere have been assessed. Using thermal gravimetric analysis, we can show that gasification may be modeled as a series of single step reactions and determine the activation energies, pre-exponential factors and reaction models of those reactions. The use of CO2/air atmosphere instead of air atmosphere results in better char conversion.
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Gokce, Furkan, Eren Aydin, Mustafa Kangul, Taylan B. Toral, Ozge Zorlu, Ozlem Sardan-Sukas y Haluk Kulah. "A parylene bonding based fabrication method for gravimetric resonant based mass sensors". En 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). IEEE, 2017. http://dx.doi.org/10.1109/transducers.2017.7994268.

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Ogheard, Florestan. "Development of a dynamic gravimetric calibration method for liquid water flow metering". En 19th International Congress of Metrology (CIM2019), editado por Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201917001.

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According to its mission of national reference laboratory, LNE-CETIAT maintains and develops the French standard for liquid water flow meters calibration from 1g.h-1 to 36 t.h-1. The reference calibration facilities at LNE-CETIAT are historically based on the flying start and stop gravimetric method. Because of the specificity of micro-flow rates, two separated and dedicated calibration benches are used for flow rates from 1 g.h-1 to 10 kg.h-1 on one side, and from 8 kg.h-1 to 36 t.h-1 on the other side. Continuous improvement of the calibration capabilities pushes LNE-CETIAT to upgrade the existing methods toward a dynamic measurement of the reference flow rate, in the scope of EURAMET EMPIR "METROWAMET" JRP in which CETIAT is a partner of the consortium. After a short review of the state of the art and a description of the current LNE-CETIAT's, this paper will first present the development of a dynamic liquid flow generator required to ensure the measurand's representability. In a second part, the development of a dedicated and traceable measurement system, based on the existing gravimetric test rig, is described. Finally, the first feasibility test is presented and future developments are proposed.
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Sharma, A., S. K. S. Boetcher, W. A. Aissa y M. J. Traum. "Impact of Interstitial Mass Transport Resistance on Water Vapor Diffusion Through Southern Mills Defender™ 750 Fabric Layers". En ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44485.

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Textiles maintain wearer comfort by allowing evaporated sweat to permeate through, providing thermal management and keeping skin dry. Each textile layer presents a resistance to mass transport consistent with its physical structure (i.e., thickness, porosity, and tortuosity). However, when textiles are layered, water vapor transport becomes more complex because diffusing molecules must traverse interstitial spaces between layers. Interstitial mass transport resistances of significant magnitude can reduce rates of water vapor transport through layered textile stacks. The prevailing textile mass transport resistance interrogation method is ASTM F1868: “Standard Test Method for Thermal and Evaporative Resistance of Clothing Materials Using a Sweating Hot Plate.” A self-calibrating element of this method is to measure one, two, three, and four fabric layers. Each newly added layer is prescribed to increase the stack mass transport resistance by the integer resistance presented by a single layer with no interstitial resistance consideration. Four improvements to ASTM F1868 are recommended: 1) gravimetric mass transport measurement, 2) a Stefan flow model, 3) correct accounting for apparatus mass transport resistances, and 4) recognizing and measuring interstitial mass transport resistances. These improvements were implemented and evaluated by running tests using Southern Mills Defender™ 750 fabric, the calibration standard used for ASTM F1868, on a new gravimetric experimental apparatus. The mass transport resistance of one fabric layer measured via the gravimetric method is related to the ASTM F1868 value through working fluid properties. Using the gravimetric approach, mass transport resistance for a single layer of calibration fabric was measured at 60.3 ± 14.4 s/m, which is consistent with the prescribed result from ASTM F1868 (after the conversion factor), 73.1 ± 7.3 s/m. The diffusion coefficient for water vapor in air in the fabric pores measured by gravimetric experiment, (2.02 ± 0.59) × 10−5 m2/s, agrees (within experimental uncertainty) with the theoretical value for the experimental conditions, 2.54 × 10−5 m2/s. However, for stacks of two or more calibration fabric layers, the gravimetric approach does not agree with the prescribed ASTM F1868 result due to interstitial mass transport resistance between fabric layers. The measured interstitial resistance value is 23.6 s/m, 39.1% of a single fabric layer, a value too significant to be ignored in engineering analysis.
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Kerimov, K. M., G. B. Agakuliyev, A. A. Abdullayev y K. G. Mamedgasanov. "The Electro-Gravimetric Method of Direct Exploration of the Oil and Gas Fields". En 59th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 1997. http://dx.doi.org/10.3997/2214-4609-pdb.131.gen1997_p140.

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Bhavanam, Anjireddy y R. C. Sastry. "Thermogravimetric Analysis and Characterisation of Yard Waste as a Feedstock to Gasification Process". En ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64415.

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Gasification has great potential to make use of the biomass and wastes as a source for energy among various thermochemical conversion processes. The aim of this work is to study the suitability of yard waste for energy conversion using gasification process by Thermo gravimetric analysis. Yard waste (consisting of leaves, twigs and grass clippings) is collected from the National Institute of Technology Warangal. It is then dried and ground to a particle size of less than 250μm for thermo gravimetric study. Before going to thermo gravimetric analysis; the sample is analyzed to measure the main properties that affect thermal conversion. Moisture content present in the sample is determined by the oven drying method. Proximate is done according to standard ASTM test methods and ultimate analysis is conducted using elemental analyzer. Finally thermo gravimetric analyses is performed at various heating rates of 10, 30, and 50°Cmin−1 in nitrogen (inert) and air (oxidizing) atmospheres. The weight losses of yard waste in inert atmosphere occur in three stages and in air it occurs in four stages.
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Nicolas, L., C. Blanc, C. Fercocq, L. Baillet, R. Linossier y JL Pons. "3PC-024 The validation of control method: the gravimetric analysis in cytotoxic drug preparation". En 24th EAHP Congress, 27th–29th March 2019, Barcelona, Spain. British Medical Journal Publishing Group, 2019. http://dx.doi.org/10.1136/ejhpharm-2019-eahpconf.105.

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Zervas, Efthimios, Pascal Dorlène, Laurent Forti, Cyriaque Perrin, Jean-Claude Momique, Richard Monier, Didier Pingal y Béatrice Lopez. "Development of an Improved Gravimetric Method for the Mass Measurement of Diesel Exhaust Gas Particles". En 2005 SAE Brasil Fuels & Lubricants Meeting. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-2145.

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Informes sobre el tema "Gravimetrisk metod"

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Rapid Integrated Method for Total Dietary Fiber. Cereal & Grains Association, 2021. http://dx.doi.org/10.1094/aaccintmethod-32-60.01.

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This method determines total dietary fiber (TDF) in foods and food ingredients, as defined by Codex Alimentarius. The method measures soluble and insoluble dietary fiber, including resistant starch, as well as nondigestible oligosaccharides. In this method, enzymatic digestion is used to simulate human intestinal digestion. Insoluble dietary fiber (IDF) and soluble dietary fiber that precipitates in 78% ethanol (SDFP) are separated by filtration and quantified gravimetrically. Additionally, highly soluble oligosaccharides (SDFS) are quantified by chromatographic separation. TDF is reported as the sum of the gravimetric and high-performance liquid chromatography (HPLC) results. The digestion and chromatographic conditions of this method have been modified from those of AACC Approved Methods 32-45.01 and 32-50.01 in an attempt to better simulate human digestion and to allow for more exact quantitation.
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