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Journal articles on the topic 'Calorimetric measurement'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Hänel, Gottfried, and Christel Hillenbrand. "Calorimetric measurement of optical absorption." Applied Optics 28, no. 3 (1989): 510. http://dx.doi.org/10.1364/ao.28.000510.

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2

Toenjes, Anastasiya, Heike Sonnenberg, Christina Plump, Rolf Drechsler, and Axel von Hehl. "Measurement and Evaluation of Calorimetric Descriptors for the Suitability for Evolutionary High-Throughput Material Development." Metals 9, no. 2 (2019): 149. http://dx.doi.org/10.3390/met9020149.

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A novel method for evolutionary material development by using high-throughput processing is established. For the purpose of this high-throughput approach, spherical micro samples are used, which have to be characterized, up-scaled to macro level and valued. For the evaluation of the microstructural state of the micro samples and the associated micro-properties, fast characterization methods based on physical testing methods such as calorimetry and universal microhardness measurements are developed. Those measurements result in so-called descriptors. The increase in throughput during calorimetric characterization using differential scanning calorimetry is achieved by accelerating the heating rate. Consequently, descriptors are basically measured in a non-equilibrium state. The maximum heating rate is limited by the possibility to infer the microstructural state from the calorimetric results. The substantial quality of the measured descriptors for micro samples has to be quantified and analyzed depending on the heating rate. In this work, the first results of the measurements of calorimetric descriptors with increased heating rates for 100Cr6 will be presented and discussed. The results of low and high heating rates will be compared and analyzed using additional microhardness measurements. Furthermore, the validation of the method regarding the suitability for the evolutionary material development includes up-scaling to macro level and therefore different sample masses will be investigated using micro and macro samples during calorimetry.

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P. Kamakshi Thai, Sushanth Ponaganti, Uday Shekar Gowri, and Suresh Banothu. "Investigation of calorimetry burned in food using image processing and IoT." International Journal of Science and Research Archive 14, no. 1 (2025): 1232–43. https://doi.org/10.30574/ijsra.2025.14.1.0200.

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Calorimetry is an avenue for exploring the energy change due to heat involved between the various reaction stages at chemical, physical, or phase transition levels. Calorimetry seeks to determine the calories contained in food items within food science. However, classical calorimetric analyses are time-consuming and require a good amount of human intervention. The concept of image processing, involving the YOLO object detection algorithm, along with IoT technologies are a completely new domain in automating calorimetric measurements in food with high accuracy. YOLO's fast and efficient detection of the object allows accurate identification and tracking of food samples during the analysis. The project aims to develop a system that will efficiently and accurately measure the caloric value of carbonized food samples using image processing using YOLO and IoT-unified data collection method to automate the whole data gathering process and achieve precision in measurement and with monitoring and analysis in real time.

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4

Eva, E., and K. Mann. "Calorimetric measurement of two-photon absorption." Applied Physics A: Solids and Surfaces 62, no. 2 (1996): 143. http://dx.doi.org/10.1007/s003390050276.

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5

Robertson, R. G. H., and Paul E. Koehler. "Calorimetric measurement of thermal neutron flux." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 251, no. 2 (1986): 307–12. http://dx.doi.org/10.1016/0168-9002(86)90795-3.

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6

Motalo, Andrij, and Vasil Motalo. "ANALYSIS OF CALORIMETRIC METHOD OF MEASUREMENT OF NATURAL GAS CALORIFIC VALUE." Measuring Equipment and Metrology 82, no. 3 (2021): 32–41. http://dx.doi.org/10.23939/istcmtm2021.03.032.

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The article considers the current methods of measuring the calorific value of natural gas which are valid in the upto-date gasometry. The procedure for measuring the gross and net volume-basis specific calorific value of natural gas by the calorimetric method is analyzed. It is shown that to increase the accuracy and validity of measurement results, the experiment to determine the values of gross and net volume-basis specific calorific should be performed for at least 5 samples of the investigated gas. A methodology for estimating the accuracy of measuring the gross and net volume-basis specific calorific values of natural gas by the calorimetric method by finding estimates of the uncertainty of the obtained measurement results taking into account both random and systematic influencing factors are developed. The uncertainty budgets for measuring the gross and net volumebasis-specific calorific values of natural gas have been developed for the practical implementation of the methodology. The results of experimental studies of samples of one of the natural gas fields are given and the objective values of the gross and net volumebasis specific calorific with estimates of extended uncertainty are obtained.

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7

Miccio, Luis A., Clemens Sill, Carsten Wehlack, and Gustavo A. Schwartz. "Connecting Dynamics and Thermodynamics in Polymer–Resin Cured Systems." Polymers 16, no. 24 (2024): 3508. https://doi.org/10.3390/polym16243508.

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This work connects the calorimetric responses of different rubber–resin blends with varying resin contents with their alpha relaxation dynamics. We used differential scanning calorimetry and broadband dielectric spectroscopy to characterize the calorimetric and dielectric responses of styrene–butadiene, polybutadiene, and polyisoprene with different resin contents. To model the results, we used the Gordon–Taylor equation combined with an extension of the Adam–Gibbs approach. Thus, we propose a simple and effective model that allows us to estimate the blend dynamics from the temperature dependence of the relaxation times of the pure components and the calorimetric measurement of the glass transition temperature of only one blend composition. By estimating an effective interaction parameter from calorimetry, we achieved accurate alpha relaxation dynamics predictions for different resin concentrations. Our highly predictive approach provides a realistic description of the expected dynamics. This study offers valuable insights into the dynamic properties of polymer compounds, paving the way for the fast and effective development of advanced and more sustainable materials.

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8

Ranade, M. R., F. Tessier, A. Navrotsky, and R. Marchand. "Calorimetric determination of the enthalpy of formation of InN and comparison with AlN and GaN." Journal of Materials Research 16, no. 10 (2001): 2824–31. http://dx.doi.org/10.1557/jmr.2001.0389.

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The standard enthalpy of formation of InN at 298 K has been determined using high-temperature oxidative drop solution calorimetry in a molten sodium molybdate solvent at 975 K. Calorimetric measurements were performed on six InN samples with varying nitrogen contents. The samples were characterized using x-ray diffraction, chemical analysis, electron microprobe analysis, and Brunauer–Emmett–Teller surface area measurement. The variation of the enthalpy of drop solution (kJ/g) with nitrogen content is approximately linear. The data, when extrapolated to stoichiometric InN, yield a standard enthalpy of formation from the elements of ?28.6 ± 9.2 kJ/mol. The relatively large error results from the deviation of individual points from the straight line rather than uncertainties in each set of data for a given sample. This new directly measured enthalpy of formation is in good agreement with the old combustion calorimetric result by Hahn and Juza (1940). However, this calorimetric enthalpy of formation is significantly different from the enthalpy of formation values derived from the temperature dependence of the apparent decomposition pressure of nitrogen over InN. A literature survey of the enthalpies of formation of III–N nitride compounds is presented.

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9

Levine, James A. "Measurement of energy expenditure." Public Health Nutrition 8, no. 7a (2005): 1123–32. http://dx.doi.org/10.1079/phn2005800.

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AbstractMeasurement of energy expenditure in humans is required to assess metabolic needs, fuel utilisation, and the relative thermic effect of different food, drink, drug and emotional components. Indirect and direct calorimetric and non-calorimetric methods for measuring energy expenditure are reviewed, and their relative value for measurement in the laboratory and field settings is assessed. Where high accuracy is required and sufficient resources are available, an open-circuit indirect calorimeter can be used. Open-circuit indirect calorimeters can employ a mask, hood, canopy or room/chamber for collection of expired air. For short-term measurements, mask, hood or canopy systems suffice. Chamber-based systems are more accurate for the long-term measurement of specified activity patterns but behaviour constraints mean they do not reflect real life. Where resources are limited and/or optimum precision can be sacrificed, flexible total collection systems and non-calorimetric methods are potentially useful if the limitations of these methods are appreciated. The use of the stable isotope technique, doubly labelled water, enables total daily energy expenditure to be measured accurately in free-living subjects. The factorial method for combining activity logs and data on the energy costs of activities can also provide detailed information on free-living subjects.

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10

Gerasimov, Anatoly А., Boris A. Grigoriev, Mikhail A. Kuznetsov, and Alexander D. Kozlov. "Measurement of the isobar heat capacity of fluids in the critical area by the method of flowing adiabatic calorimeter." Izmeritel`naya Tekhnika, no. 2 (2021): 30–37. http://dx.doi.org/10.32446/0368-1025it.2021-2-30-37.

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With regard to the problem of refining the fundamental equations of state of hydrocarbons, the methodological and design features of the experimental measurement of the isobaric heat capacity in the critical region by the method of a flow adiabatic calorimeter are considered. The pressure measurement system has been improved by introducing a differential manometer into the measuring circuit, which made it possible not only to increase the accuracy of pressure determination, but also to implement a universal scheme of calorimetric experiment. The use of a universal scheme of the calorimetric experiment allows one to determine two values of the isobaric heat capacity at pressures that differ by the value of the pressure loss in the calorimeter. Such an approach in the critical region is relevant, since it makes it possible to quite simply and reliably determine the value of the derivative of the heat capacity with respect to pressure, which is used to estimate not only the error in assigning the value of heat capacity to pressure, but also the equilibrium conditions of the experiment in a flow-through calorimeter. The technique of determining and making a correction for the inhomogeneity of the supply wires of the differential thermocouple, for the throttling of the flow of matter in the calorimeter is considered. Correct relations are obtained for determining the average temperature of the measurement experiment for various methods of measuring the temperature and temperature difference in a flow-through calorimeter. The results of experimental measurements of the isobaric heat capacity of n-pentane in the critical region, obtained using the universal scheme of the calorimetric experiment, for n-pentane were measured on an isobar of 3.400 MPa (critical pressure 3.355 MPa), which is the closest to the critical point at practice of flow calorimetry

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11

Schöck, W., and V. Vrangos. "Calorimetric measurement of water fog mass concentration." Journal of Aerosol Science 17, no. 3 (1986): 525–29. http://dx.doi.org/10.1016/0021-8502(86)90149-7.

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12

Hansen, Lee D., Delbert J. Eatough, Edwin A. Lewis, Robert G. Bergstrom, Damaris Degraft-Johnson, and Karen Cassidy-Thompson. "Shelf-life prediction from induction period calorimetric measurements on materials undergoing autocatalytic decomposition." Canadian Journal of Chemistry 68, no. 11 (1990): 2111–14. http://dx.doi.org/10.1139/v90-321.

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The shelf- or use-life of a material which decomposes by an autocatalytic reaction is shown to be inversely proportional to the rate of heat generation during the induction period of the degradation reaction. Calorimetric measurement of the rate of heat generation during the induction period takes only a few hours. It can often be done at or very near the actual storage or use temperature of the material. Measurements on Lovastatin (2-methylbutanoic acid 1,2,3,7,8,8a-hexahydro-3,7-dimethyl-8-[2-(tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1-naphthalenylester) are used as an example of this application. Keywords: autocatalytic, calorimetry, oxidation, decomposition, Lovastatin, Mevacor.

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13

Zhang, Xing, Zhijian Feng, Jianing Wang, and Shaolin Yu. "An Optimized Temperature Sensor Calorimetric Power Device Loss Measurement Method." Energies 12, no. 7 (2019): 1333. http://dx.doi.org/10.3390/en12071333.

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In the optimized design of power converters, loss analysis of power devices is important. Compared with estimation methods, measuring the power device loss directly in the circuit under test is more accurate. The loss measurement method can be divided into two categories: electrical measurement and calorimetric measurement. The accuracy of the electrical measurement result is restricted to the accuracy of the measurement equipment and parasitic parameters, especially for fast switching devices like SiC devices. The results obtained from calorimetric measurement are more convincing. Based on the measurement principle, calorimetric measurement can be divided into four categories: flow density measurement, temperature equivalent measurement, double jacket measurement, and temperature sensor measurement. This paper proposes an optimized temperature sensor measurement method, which has shorter time consumption, a simpler setup, and lower cost. The principles of the optimized method are described and compared with the traditional ways in detail to show its advantages. The loss measurement and error analysis are carried out in a three-level ANPC (active neutral-point-clamped) topology experiment platform based on the SiC&Si hybrid module to prove the accuracy and practicability of this method.

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14

Gusinsky, A. V., M. M. Kasperovich, and V. A. Bogush. "Improving the accuracy and metrological support of power meters in the frequency range from 37.5 to 178.6 GHz." Doklady BGUIR 19, no. 3 (2021): 81–88. http://dx.doi.org/10.35596/1729-7648-2021-19-3-81-88.

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To satisfy the needs for metrological support of power measurements in the frequency range from 37.5 to 178.6 GHz, the device has been developed and designed for automated measurements, calibrations and verification of wattmeters with high accuracy and the ability to adapt to various types of devices under investigation. This paper presents the composition, diagram andgeneral principle of the device. A description of the structure of isothermal calorimetric converters of autocompensation type with dry load and reference body, which are the basis of the device, is given. The implemented algorithms for converting and replacing microwave power with direct current power of the developed calorimetric wattmeters are presented. The measures taken at the manufacturing stage to minimize sources of measurement uncertainty are described. To assess the accuracy of measuring the absorbed power, a mathematical model of the conversion factor has been compiled. Corrections have been introduced into this mathematical model to improve the measurement accuracy of the reproducible microwave power. The obtained basic metrological and technical characteristics of calorimetric wattmeters and comparison equipment of the device are presented. The obtained metrological and technical characteristics correspond to the current level of standard equipment.

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15

Volte, A., C. Reynard-Carette, J. Brun, et al. "Study of the Flow Temperature and Ring Design Influence on the Response of a New Reduced-Size Calorimetric Cell for Nuclear Heating Quantification." EPJ Web of Conferences 170 (2018): 04026. http://dx.doi.org/10.1051/epjconf/201817004026.

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This paper concerns experimental studies of different designs of a new compact calorimetric cell under laboratory conditions. This kind of cell is used for the measurement of the nuclear heating rate inside Material Testing Reactors thanks to differential calorimetry. The results, obtained by applying an operating protocol corresponding to a preliminary out-of-pile calibration step, are presented for three designs. The influence of the horizontal-fin design is shown on the calibration curve and the sensor sensitivity. The influence of the external fluid flow temperature is given for the quarter design. The different responses of the calorimetric cell are explained by taken into account a 1D analytical thermal model coupling thermal conductive and radiative transfers.

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16

Ivanov, S. O., L. V. Dekusha, L. Y. Vorobiov, and O. L. Dekusha. "THE DEVELOPMENT OF A CRYOGENIC CALORIMETRIC SYSTEM FOR STUDYING THE STATE OF LIQUIDS IN INHOMOGENEOUS MATERIALS." Thermophysics and Thermal Power Engineering 43, no. 2 (2021): 84–90. http://dx.doi.org/10.31472/ttpe.2.2021.10.

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The analysis of methods and means of experimental determination of the ratio of free and bound moisture in materials is carried out, and it is shown that most of the available measuring instruments do not allow investigating the ratio of free and bound moisture on representative samples of heterogeneous materials, therefore there is a need to create a specialized device for these purposes. Thus, the concerned work is aimed to the development of the differential scanning calorimetry method for studying the state of liquids in inhomogeneous materials and the creation of a cryogenic calorimetric system for the implementation of this method. On the basis of the performed analysis, recommendations were formulated for the development of a measuring system that is capable of examining representative samples of heterogeneous materials of various structures without the need for their preliminary grinding. The method of differential scanning calorimetry has been improved for studying the state of water and organic liquids in inhomogeneous materials in a wide temperature range, which is based on the use of a three-cell differential measurement scheme, as well as the use of cells, the configuration of which allows taking into account the peculiarities of inhomogeneous raw materials. A prototype of a cryogenic calorimetric system has been created, and a method for studying the metrological characteristics of such a system has been developed. On the basis of experimental studies, it has been established that the limits of the permissible relative measurement error of using the developed cryogenic calorimetric system are ± 5%, which corresponds to world analogues.

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17

Abratenko, P., N. Abrego-Martinez, A. Aduszkiewicz, et al. "Angular dependent measurement of electron-ion recombination in liquid argon for ionization calorimetry in the ICARUS liquid argon time projection chamber." Journal of Instrumentation 20, no. 01 (2025): P01033. https://doi.org/10.1088/1748-0221/20/01/p01033.

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Abstract This paper reports on a measurement of electron-ion recombination in liquid argon in the ICARUS liquid argon time projection chamber (LArTPC). A clear dependence of recombination on the angle of the ionizing particle track relative to the drift electric field is observed. An ellipsoid modified box (EMB) model of recombination describes the data across all measured angles. These measurements are used for the calorimetric energy scale calibration of the ICARUS TPC, which is also presented. The impact of the EMB model is studied on calorimetric particle identification, as well as muon and proton energy measurements. Accounting for the angular dependence in EMB recombination improves the accuracy and precision of these measurements.

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18

Pekola, J. P., P. Solinas, A. Shnirman, and D. V. Averin. "Calorimetric measurement of work in a quantum system." New Journal of Physics 15, no. 11 (2013): 115006. http://dx.doi.org/10.1088/1367-2630/15/11/115006.

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19

Rasilo, P., J. Ekström, A. Haavisto, A. Belahcen, and A. Arkkio. "Calorimetric system for measurement of synchronous machine losses." IET Electric Power Applications 6, no. 5 (2012): 286. http://dx.doi.org/10.1049/iet-epa.2011.0241.

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20

Lorenz, Ralph D. "Calorimetric radar absorptivity measurement using a microwave oven." Measurement Science and Technology 10, no. 6 (1999): L29—L32. http://dx.doi.org/10.1088/0957-0233/10/6/101.

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21

Hansen, Lee D. "Calorimetric Measurement of the Kinetics of Slow Reactions." Industrial & Engineering Chemistry Research 39, no. 10 (2000): 3541–49. http://dx.doi.org/10.1021/ie000033n.

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22

Kim, Y. B., and F. Sommer. "Calorimetric measurement of liquid aluminium-lithium-zinc alloys." Thermochimica Acta 291, no. 1-2 (1997): 27–34. http://dx.doi.org/10.1016/s0040-6031(96)03087-0.

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23

Körber, Christoph, Sabine Englich, and Günter Rau. "Intracellular ice formation: cryomicroscopical observation and calorimetric measurement." Journal of Microscopy 161, no. 2 (1991): 313–25. http://dx.doi.org/10.1111/j.1365-2818.1991.tb03092.x.

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24

Suvorov, S. A., and G. N. Kolesnikov. "Calorimetric thermal conductivity measurement for high-temperature materials." Refractories and Industrial Ceramics 50, no. 1 (2009): 62–63. http://dx.doi.org/10.1007/s11148-009-9134-7.

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25

Kušnerová, Milena, Jan Valíček, Marta Harničárová, et al. "The Combined Relative Uncertainty of Measurement Results by Prototype Semi-Automated Calorimetric Chamber." Measurement Science Review 19, no. 2 (2019): 53–60. http://dx.doi.org/10.2478/msr-2019-0009.

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Abstract The paper presents an evaluation of the combined relative uncertainty of the result of direct step temperature measurements aimed at evaluation of the indirect measurements of the specific thermal capacity of the heat insulating concrete by means of a pair of resistive cable thermometers fitted with Pt100 temperature sensors and integrated into a computer-controlled calorimetric chamber. In particular, it is a proposal of evaluation of the overall relative uncertainty of the measurement of partial temperatures measured in equidistant time steps, in a relatively wider time interval. In practice, the uncertainty of the result of step temperature measurements is most often declared only by the instrument uncertainty specified by the manufacturer. The exact evaluation of the result of the measurements of thermal and temperature material parameters measured by the calorimetric comparison method is required by the fact that the investigated samples are made of newly designed non-tabulated building materials and that the measurements are made by a prototype device.

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26

Masuda, H., and M. Higano. "Measurement of Total Hemispherical Emissivities of Metal Wires by Using Transient Calorimetric Technique." Journal of Heat Transfer 110, no. 1 (1988): 166–72. http://dx.doi.org/10.1115/1.3250448.

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An application of the transient calorimetric technique was studied for measuring total hemispherical emissivities of metal wires. A unique idea of using guard wires, which have a function similar to usual guard heaters, was incorporated into the emissivity apparatus to reduce conduction heat losses through thermocouple leads suspending a specimen. Emissivity measurements were performed by using a copper wire as a specimen. The heat losses through the leads were analyzed in considering radiation heat transfer from the leads, and the effect of the guard wires on the heat losses was clarified. Temperature distributions in the specimen were also obtained analytically. From these results, it was found that an improved transient calorimetric technique in this work is applicable to the emissivity measurement on metal wires, and that the accuracy in the measurements is adequate.

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27

Shepherd, A., T. Patton, A. Pimazzoni, et al. "Direct current measurements of the SPIDER beam: a comparison to existing beam diagnostics." Journal of Instrumentation 18, no. 07 (2023): C07019. http://dx.doi.org/10.1088/1748-0221/18/07/c07019.

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Abstract For negative ion beam sources there are several methods of measuring the accelerated beam current, most commonly electrical measurements at the power supply and calorimetric measurements. On SPIDER, the ITER Heating Neutral Beam full-scale beam source prototype, electrical measurements at the acceleration grid power supply (AGPS) are complemented by polarizing the diagnostic calorimeter STRIKE to provide an additional electrical measurement of the accelerated current. This is in addition to the calorimetric measurements provided by STRIKE. These diagnostics give differing measurements of the beam current. Exploiting the reduced number of open apertures on SPIDER a new beam diagnostic has been installed to measure the individual beamlet currents directly. The so called Beamlet Current Monitor (BCM) has been used to measure the current of five beamlets during the most recent SPIDER campaign. This work compares the BCM current to the electrical measurements at the AGPS and STRIKE. The average BCM current agrees well with the STRIKE electrical measurements, indicating that the AGPS overestimates the beam current. The individual beamlets are compared to the STRIKE calorimetric measurements, showing similar current trends with the source parameters.

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28

Ditmars, David A. "Calibration standards for differential scanning calorimetry I. Zinc: absolute calorimetric measurement of Tfus and ΔfusHm". Journal of Chemical Thermodynamics 22, № 7 (1990): 639–51. http://dx.doi.org/10.1016/0021-9614(90)90017-k.

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29

Xu Luhan, 许路寒, 张浩 Zhang Hao, 李东 Li Dong, 陈斌 Chen Bin, 郑玉萍 Zheng Yuping та 姚亮 Yao Liang. "基于光声热测量法的血液流速无创测量". Chinese Journal of Lasers 51, № 3 (2024): 0307205. http://dx.doi.org/10.3788/cjl231363.

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30

Anurag, Anup, Sayan Acharya, and Subhashish Bhattacharya. "An Accurate Calorimetric Loss Measurement Method for SiC MOSFETs." IEEE Journal of Emerging and Selected Topics in Power Electronics 8, no. 2 (2020): 1644–56. http://dx.doi.org/10.1109/jestpe.2019.2920935.

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31

Carey, J. William. "Calorimetric Measurement of the Enthalpy of Hydration of Clinoptilolite." Clays and Clay Minerals 45, no. 6 (1997): 826–33. http://dx.doi.org/10.1346/ccmn.1997.0450606.

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32

Anderson, Thomas G., Anmin Tan, Peter Ganz та Joachim Seelig. "Calorimetric Measurement of Phospholipid Interaction with Methyl-β-Cyclodextrin†". Biochemistry 43, № 8 (2004): 2251–61. http://dx.doi.org/10.1021/bi0358869.

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33

Eikelboom, J. A. "Apparatus for calorimetric measurement of a.c. losses in superconductors." Cryogenics 31, no. 5 (1991): 363–65. http://dx.doi.org/10.1016/0011-2275(91)90110-i.

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34

Hameury, J., B. Hay, and J. R. Filtz. "Measurement of Total Hemispherical Emissivity Using a Calorimetric Technique." International Journal of Thermophysics 28, no. 5 (2007): 1607–20. http://dx.doi.org/10.1007/s10765-007-0213-z.

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35

Reynard-Carette, C., G. Kohse, J. Brun, M. Carette, A. Volte, and A. Lyoussi. "Review of Nuclear Heating Measurement by Calorimetry in France and USA." EPJ Web of Conferences 170 (2018): 04019. http://dx.doi.org/10.1051/epjconf/201817004019.

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This paper gives a short review of sensors dedicated to measuring nuclear heating rate inside fission reactors in France and USA and especially inside Material Testing Reactors. These sensors correspond to heat flow calorimeters composed of a single calorimetric cell or of two calorimetric cells at least with a reference cell to obtain a differential calorimeter. The aim of this paper is to present the common running principle of these sensors and their own special characteristics through their design, calibration methods, and in-pile measurement techniques, and to describe multi-sensor probes including calorimeters.

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36

Budaragin, R. V., Z. Ju Salasenko, A. D. Serov, and I. A. Tsvetkova. "Calorimetric Measurements of a High-Power RF Signal." Devices and Methods of Measurements 15, no. 3 (2024): 248–58. http://dx.doi.org/10.21122/2220-9506-2024-15-3-248-258.

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Development of a high-power RF signal meter based on the method of calorimetric measurements, which in some cases is the only possible one is presented. The device is as a system of elements exchanging either energy or information, the operation and interconnection of which ensures the stability of its functioning. The main elements of the device are: a coordinated load and a two-circuit water-air cooling system that convert RF energy first into thermal electrical energy, and then into internal energy of the coolant (working fluid). The measurement and control system provides information display on the monitor and generation of internal control signals. The work focuses on the process of converting electromagnetic energy into internal energy of the coolant, since the matched RF load is integrated into the cooling system and requires special design and technological solutions to ensure efficient operation. A cooling and measurement system has been designed to test the developed RF absorber with a power of up to 5 kW. The parameters of the cooling system were determined based on minimizing the time to achieve thermal equilibrium (time to establish readings) and the set parameters (input temperature no more than 35 °С, temperature difference no more than 40 °С). Based on calculations of the electrodynamic model constructed by the partial domain method, the geometric dimensions were determined at which the voltage standing wave ratio of the load in the operating frequency range (from DC to 1300 MHz) will be the smallest. The article presents the results of designing a high-frequency wattmeter cooled by a liquid (water), examines the thermophysical processes occurring in it and the influence of the presence of a coolant in the cooling circuit.

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37

Vehusheia, Signe L. K., Cosmin I. Roman, Markus Arnoldini, and Christofer Hierold. "Experimental In Vitro Microfluidic Calorimetric Chip Data towards the Early Detection of Infection on Implant Surfaces." Sensors 24, no. 3 (2024): 1019. http://dx.doi.org/10.3390/s24031019.

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Heat flux measurement shows potential for the early detection of infectious growth. Our research is motivated by the possibility of using heat flux sensors for the early detection of infection on aortic vascular grafts by measuring the onset of bacterial growth. Applying heat flux measurement as an infectious marker on implant surfaces is yet to be experimentally explored. We have previously shown the measurement of the exponential growth curve of a bacterial population in a thermally stabilized laboratory environment. In this work, we further explore the limits of the microcalorimetric measurements via heat flux sensors in a microfluidic chip in a thermally fluctuating environment.

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Zhang, Yahong, Alexandra Navrotsky, and Toshimori Sekine. "Energetics of cubic Si3N4." Journal of Materials Research 21, no. 1 (2006): 41–44. http://dx.doi.org/10.1557/jmr.2006.0033.

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High-temperature oxide melt drop solution calorimetry was used to study the energetics of formation of cubic silicon nitride prepared at high pressure. The standard enthalpy of formation of c-Si3N4 is −776.3 ± 9.5 kJ/mol. The calorimetric measurement of Si3N4 in 3Na2O·4MoO3 solvent was validated by comparing the enthalpy of formation for β–Si3N4 with previous work using alkali borate solvent. The enthalpy of transformation from β– to c-Si3N4 is 80.2 ± 9.6 kJ/mol. This value appears consistent with the observed synthesis conditions, which do not represent reversed equilibrium reactions.

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Zverev, Valentin. "Determination of convective heat transfer parameters by the calorimetric method of a thin wall." Thermal Science 23, Suppl. 2 (2019): 497–504. http://dx.doi.org/10.2298/tsci19s2497z.

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The paper proposes a procedure of experimental data processing by the thin wall method for the diagnostics of stationary gas-flows. The procedure is based on solving an inverse convective heat transfer problem. It does not use smoothing and numerical differentiation of experimental data, and is resistant to measurement errors. Sensitivity coefficients are analyzed to find the most informative times for the determination of convective heat transfer parameters with the least influence of the measurement error. The numerical examples given show the effectiveness of the calculation procedure for the heat transfer coefficient and the gas-flow temperature determined from discrete measurements of the sensor temperature.

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Julian, Jepsen, Milanese Chiara, Puszkiel Julián, et al. "Fundamental Material Properties of the 2LiBH4-MgH2 Reactive Hydride Composite for Hydrogen Storage: (I) Thermodynamic and Heat Transfer Properties." Energies 11 (April 27, 2018): 1081. https://doi.org/10.3390/en11051081.

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Thermodynamic and heat transfer properties of the 2LiBH4-MgH2 composite (Li-RHC) system are experimentally determined and studied as a basis for the design and development of hydrogen storage tanks. Besides the determination and discussion of the properties, different measurement methods are applied and compared to each other. Regarding thermodynamics, reaction enthalpy and entropy are determined by pressure-concentration-isotherms and coupled manometric-calorimetric measurements. For thermal diffusivity calculation, the specific heat capacity is measured by high-pressure differential scanning calorimetry and the effective thermal conductivity is determined by the transient plane source technique and in situ thermocell. Based on the results obtained from the thermodynamics and the assessment of the heat transfer properties, the reaction mechanism of the Li-RHC and the issues related to the scale-up for larger hydrogen storage systems are discussed in detail.

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Nebhen, Jamel, Khaled Alnowaiser, and Sofiene Mansouri. "Constant Temperature Anemometer with Self-Calibration Closed Loop Circuit." Applied Sciences 10, no. 10 (2020): 3405. http://dx.doi.org/10.3390/app10103405.

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In this paper, a Micro-Electro-Mechanical Systems (MEMS) calorimetric sensor with its measurement electronics is designed, fabricated, and tested. The idea is to apply a configurable voltage to the sensitive resistor and measure the current flowing through the heating resistor using a current mirror controlled by an analog feedback loop. In order to cancel the offset and errors of the amplifier, the constant temperature anemometer (CTA) circuit is periodically calibrated. This technique improves the accuracy of the measurement and allows high sensitivity and high bandwidth frequency. The CTA circuit is implemented in a CMOS FD-SOI 28 nm technology. The supply voltage is 1.2 V while the core area is 0.266 mm2. Experimental results demonstrate the feasibility of the MEMS calorimetric sensor for measuring airflow rate. The developed MEMS calorimetric sensor shows a maximum normalized sensitivity of 117 mV/(m/s)/mW with respect to the input heating power and a wide dynamic flow range of 0–26 m/s. The high sensitivity and wide dynamic range achieved by our MEMS flow sensor enable its deployment as a promising sensing node for direct wall shear stress measurement applications.

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Liu, Mingsheng, and D. E. Claridge. "A Noncalorimetric Method for Heat-Transfer Coefficient Measurement of Building Thermal Envelopes." Journal of Solar Energy Engineering 117, no. 2 (1995): 108–13. http://dx.doi.org/10.1115/1.2870829.

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A noncalorimetric method for measuring the heat-transfer coefficient (UA) of building thermal envelopes is proposed and applied in an indoor test cell. The UA value measured by this method agrees closely with that measured by a calorimetric method. This method creates a Single input and a Single output data Pair (SSP) from the measured data sets by using digital filters. The filter output and physical criteria are used to determine the correct transfer function, which yields the measured UA value. This method seems to have the following advantages over calorimetric methods: it uses shorter measurement times, uses simpler test equipment, and has minimum thermal intrusion on normal operating conditions.

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Yao, H., K. Ema, K. Takahashi, and I. Hatta. "AC calorimetric heat-capacity measurement on thermal denaturation in proteins." Seibutsu Butsuri 40, supplement (2000): S176. http://dx.doi.org/10.2142/biophys.40.s176_1.

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NATORI, Naotake, Noboru HIGUCHI, Noriharu TAMADA, and Shuichiro FUCHINO. "A New Calorimetric Method for AC Loss Measurement of Superconductors." TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 29, no. 5 (1994): 174–80. http://dx.doi.org/10.2221/jcsj.29.174.

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Yamagishi, H., Y. Suzuki, and A. Hiraide. "Precise measurement of photodiode spectral responses using the calorimetric method." IEEE Transactions on Instrumentation and Measurement 38, no. 2 (1989): 578–80. http://dx.doi.org/10.1109/19.192351.

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Schroeder, W. L., and D. Gapski. "Direct Measurement of Small Antenna Radiation Efficiency by Calorimetric Method." IEEE Transactions on Antennas and Propagation 54, no. 9 (2006): 2646–56. http://dx.doi.org/10.1109/tap.2006.880717.

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See, K. W., C. D. Cook, and S. X. Dou. "Innovative Calorimetric AC Loss Measurement of HTSC for Power Applications." IEEE Transactions on Applied Superconductivity 21, no. 3 (2011): 3261–64. http://dx.doi.org/10.1109/tasc.2010.2092741.

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Trampe, D. Mark, and Charles A. Eckert. "Calorimetric measurement of partial molar excess enthalpies at infinite dilution." Journal of Chemical & Engineering Data 36, no. 1 (1991): 112–18. http://dx.doi.org/10.1021/je00001a033.

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Baholo, B., P. H. Mellor, D. Howe, and T. S. Birch. "An automated calorimetric method of loss measurement in electrical machines." Journal of Magnetism and Magnetic Materials 133, no. 1-3 (1994): 433–36. http://dx.doi.org/10.1016/0304-8853(94)90587-8.

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Radak, B. B., E. Radošević, and B. Lj Šećerov. "Calorimetric measurement of the power of high-intensity electron beams." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 258, no. 2 (1987): 261–65. http://dx.doi.org/10.1016/0168-9002(87)90067-2.

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