We are proudly a Ukrainian website. Our country was attacked by Russian Armed Forces on Feb. 24, 2022.
You can support the Ukrainian Army by following the link: https://u24.gov.ua/.
Even the smallest donation is hugely appreciated!
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Dynamical temperature measurement".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Статті в журналах з теми "Dynamical temperature measurement":
1
Fedynets, Vasyl, Ihor Vasylkivskyi, and Yaroslav Yusyk. "Optimization of Gas Dynamical Subsystem of Transducers for Measurement of Gas Flow Temperature." Energy Engineering and Control Systems 2, no. 2 (2016): 43–48. http://dx.doi.org/10.23939/jeecs2016.02.043.
SAWATO, Hiroshi, Shinichi TASHIRO, Kazuhiro NAKATA, Manabu TANAKA, Eri YAMAMOTO, Kei YAMAZAKI, and Keiichi SUZUKI. "Measurement of dynamical variation in two-dimensional temperature distribution of TIG pulsed-arcs." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 29, no. 3 (2011): 23s—26s. http://dx.doi.org/10.2207/qjjws.29.23s.
Heckl, Mareike, Andreas Fix, Matthias Jirousek, Franz Schreier, Jian Xu, and Markus Rapp. "Measurement characteristics of an airborne microwave temperature profiler (MTP)." Atmospheric Measurement Techniques 14, no. 2 (March 1, 2021): 1689–713. http://dx.doi.org/10.5194/amt-14-1689-2021.
Abstract. The microwave temperature profiler (MTP), an airborne passive microwave radiometer, measures radiances, recorded as counts and calibrated to brightness temperatures, in order to estimate temperature profiles around flight altitude. From these data, quantities such as potential temperature gradients and static stability, indicating the state of the atmosphere, can be derived and used to assess important dynamical processes (e.g., gravity waves or stability assessments). DLR has acquired a copy of the MTP from NASA–JPL, which was designed as a wing-canister instrument and is deployed on the German High Altitude LOng range research aircraft (HALO). For this instrument a thorough analysis of instrument characteristics has been made in order to correctly determine the accuracy and precision of MTP measurements. Using a laboratory setup, the frequency response function and antenna diagram of the instrument were carefully characterized. A cold chamber was used to simulate the changing in-flight conditions and to derive noise characteristics as well as reliable calibration parameters for brightness temperature calculations, which are compared to those calculated from campaign data. The MTP shows quite large changes in the instrument state, imposing considerable changes in calibration parameters over the course of a single measurement flight; using a built-in heated target for calibration may yield large errors in brightness temperatures due to a misinterpretation of the measured absolute temperature. Applying the corrections presented herein to the calibration parameter calculations, the measurement noise becomes the dominant source of uncertainty and it is possible to measure the brightness temperatures around flight level (closely related to the absolute temperature close to the instrument) with a precision of 0.38 K. Furthermore, radiative transfer simulations, using the Py4CAtS package in a pencil-beam approach, indicate that the altitude range of the sensitivity of the MTP instrument can be increased by applying a modified measurement strategy. This is the first time such an extensive characterization of an MTP instrument, including a thorough calibration strategy assessment, has been published. The presented results, relevant for the wing-canister design of the MTP instrument, are important when processing MTP data: knowledge of the relevant uncertainties and instrument characteristics is essential for retrieval setup and is mandatory to correctly identify and interpret significant atmospheric temperature fluctuations.
4
Jeon, Min-Gyu, Deog-Hee Doh, Yoshihiro Deguchi, Takahiro Kamimoto, and Minchao Cui. "Evaluation of 3D measurement using CT-TDLAS." Modern Physics Letters B 33, no. 14n15 (May 28, 2019): 1940018. http://dx.doi.org/10.1142/s0217984919400189.
In order to satisfy the requirements of high quality and optimal material manufacturing process, it is important to control the environment of the manufacturing process. Depending on these processes, it is possible to improve the quality of the product by adjusting various gases. With the advent of the tunable laser absorption spectroscopy (TDLAS) technique, the temperature and concentration of the gases can be measured simultaneously. Among them, computed tomography-tunable diode laser absorption spectroscopy (CT-TDLAS) is the most important technique for measuring the distributions of temperature and concentration across the two-dimensional planes. This study suggests a three-dimensional measurement to consider the irregular flow of supplying gases. The simultaneous multiplicative algebraic reconstruction technique (SMART) algorithm was used among the CT algorithms. Phantom datasets have been generated by using Gaussian distribution method. It can show expected temperature and concentration distributions. The (HITRAN) database in which the thermo-dynamical properties and the light spectra of H2O are listed were used for the numerical test. The relative average temperature error ratio in the results obtained by the SMART algorithm was about 3.2% for temperature. The maximum error was 86.8 K.
5
Rayner, Nick A., Renate Auchmann, Janette Bessembinder, Stefan Brönnimann, Yuri Brugnara, Francesco Capponi, Laura Carrea, et al. "The EUSTACE Project: Delivering Global, Daily Information on Surface Air Temperature." Bulletin of the American Meteorological Society 101, no. 11 (November 1, 2020): E1924—E1947. http://dx.doi.org/10.1175/bams-d-19-0095.1.
AbstractDay-to-day variations in surface air temperature affect society in many ways, but daily surface air temperature measurements are not available everywhere. Therefore, a global daily picture cannot be achieved with measurements made in situ alone and needs to incorporate estimates from satellite retrievals. This article presents the science developed in the EU Horizon 2020–funded EUSTACE project (2015–19, www.eustaceproject.org) to produce global and European multidecadal ensembles of daily analyses of surface air temperature complementary to those from dynamical reanalyses, integrating different ground-based and satellite-borne data types. Relationships between surface air temperature measurements and satellite-based estimates of surface skin temperature over all surfaces of Earth (land, ocean, ice, and lakes) are quantified. Information contained in the satellite retrievals then helps to estimate air temperature and create global fields in the past, using statistical models of how surface air temperature varies in a connected way from place to place; this needs efficient statistical analysis methods to cope with the considerable data volumes. Daily fields are presented as ensembles to enable propagation of uncertainties through applications. Estimated temperatures and their uncertainties are evaluated against independent measurements and other surface temperature datasets. Achievements in the EUSTACE project have also included fundamental preparatory work useful to others, for example, gathering user requirements, identifying inhomogeneities in daily surface air temperature measurement series from weather stations, carefully quantifying uncertainties in satellite skin and air temperature estimates, exploring the interaction between air temperature and lakes, developing statistical models relevant to non-Gaussian variables, and methods for efficient computation.
6
Will, Johannes, Alexander Gröschel, Christoph Bergmann, and Andreas Magerl. "In Situ Observation of the Oxygen Nucleation in Silicon with X-Ray Single Crystal Diffraction." Solid State Phenomena 178-179 (August 2011): 353–59. http://dx.doi.org/10.4028/www.scientific.net/ssp.178-179.353.
The measurement of Pendellösungs oscillations was used to observe the time dependent nucleation of oxygen in a Czochralski grown single crystal at 750°C. It is shown, that the theoretical approach of the statistical dynamical theory describes the data well. Within the framework of this theory it is possible to determine the static Debye-Waller-factor as a function of the annealing time by evaluating the mean value of the Bragg intensity and the period length. The temperature influence on the Pendellösungs distance was corrected for by measurement of a Float-zone sample at the same temperature.
7
Krolewski, Alex, and Simone Ferraro. "The Integrated Sachs Wolfe effect: unWISE and Planck constraints on dynamical dark energy." Journal of Cosmology and Astroparticle Physics 2022, no. 04 (April 1, 2022): 033. http://dx.doi.org/10.1088/1475-7516/2022/04/033.
Abstract CMB photons redshift and blueshift as they move through gravitational potentials Φ while propagating across the Universe. If the potential is not constant in time, the photons will pick up a net redshift or blueshift, known as the Integrated Sachs-Wolfe (ISW) effect. In the z ≪ 1000 universe, Φ̇ is nonzero on large scales when the Universe transitions from matter to dark energy domination. This effect is only detectable in cross-correlation with large-scale structure at z ∼ 1. In this paper we present a 3.2σ detection of the ISW effect using cross-correlations between unWISE infrared galaxies and Planck CMB temperature maps. We use 3 tomographic galaxy samples spanning 0 < z < 2, allowing us to fully probe the dark energy domination era and the transition into matter domination. This measurement is consistent with ΛCDM (AISW = 0.96 ± 0.30). We study constraints on a particular class of dynamical dark energy models (where the dark energy equation of state is different in matter and dark energy domination), finding that unWISE-ISW improves constraints from type Ia supernovae due to improved constraints on the time evolution of dark energy. When combining with BAO measurements, we obtain the tightest constraints on specific dynamical dark energy models. In the context of a phenomenological model for freezing quintessence, the Mocker model, we constrain the dark energy density within 10% at z < 2 using ISW, BAO and supernovae. Moreover, the ISW measurement itself provides an important independent check when relaxing assumptions about the theory of gravity, as it is sensitive to the gravitational potential rather than the expansion history.
8
Wright, Corwin J., Richard J. Hall, Timothy P. Banyard, Neil P. Hindley, Isabell Krisch, Daniel M. Mitchell, and William J. M. Seviour. "Dynamical and surface impacts of the January 2021 sudden stratospheric warming in novel Aeolus wind observations, MLS and ERA5." Weather and Climate Dynamics 2, no. 4 (December 20, 2021): 1283–301. http://dx.doi.org/10.5194/wcd-2-1283-2021.
Abstract. Major sudden stratospheric warmings (SSWs) are extreme dynamical events where the usual strong westerly winds of the stratospheric polar vortex temporarily weaken or reverse and polar stratospheric temperatures rise by tens of kelvins over just a few days and remain so for an extended period. Via dynamical modification of the atmosphere below them, SSWs are believed to be a key contributor to extreme winter weather events at the surface over the following weeks. SSW-induced changes to the wind structure of the polar vortex have previously been studied in models and reanalyses and in localised measurements such as radiosondes and radars but have not previously been directly and systematically observed on a global scale because of the major technical challenges involved in observing winds from space. Here, we exploit novel observations from ESA's flagship Aeolus wind-profiler mission, together with temperature and geopotential height data from NASA's Microwave Limb Sounder and surface variables from the ERA5 reanalysis, to study the 2021 SSW. This allows us to directly examine wind and related dynamical changes associated with the January 2021 major SSW. Aeolus is the first satellite mission to systematically and directly acquire profiles of wind, and therefore our results represent the first direct measurements of SSW-induced wind changes at the global scale. We see a complete reversal of the zonal winds in the lower to middle stratosphere, with reversed winds in some geographic regions reaching down to the bottom 2 km of the atmosphere. These altered winds are associated with major changes to surface temperature patterns, and in particular we see a strong potential linkage from the SSW to extreme winter weather outbreaks in Greece and Texas during late January and early February. Our results (1) demonstrate the benefits of wind-profiling satellites such as Aeolus in terms of both their direct measurement capability and use in supporting reanalysis-driven interpretation of stratosphere–troposphere coupling signatures, (2) provide a detailed dynamical description of a major weather event, and (3) have implications for the development of Earth-system models capable of accurately forecasting extreme winter weather.
9
Tanaka, Manabu. "Plasma Diagnostics of Arc during MIG Welding of Aluminum." Materials Science Forum 783-786 (May 2014): 2828–32. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2828.
In this study, distributions of temperature and metal vapor during MIG welding of aluminum are obtained. Since a droplet forms and detaches at a tip of wire, and pass through the arc plasma during MIG welding, dynamic plasma diagnostics are demanded. This study aims to develop method for measuring dynamical variation of two-dimensional distribution of temperature and metal vapor concentration in the arc through optical measurement and to analyze behavior of the metal vapor in MIG welding. As the results, in MIG welding of aluminum, the arc plasma has double structure consisting of high temperature region apart from the arc axis and low temperature region near the arc axis due to influence of the aluminum vapor. Furthermore, the low temperature region near the arc axis occurs because the arc plasma is cooled especially through the intensive radiation loss caused by high concentration of the metal vapor.
10
De Roo, Frederik, and Tirtha Banerjee. "Can a Simple Dynamical System Describe the Interplay between Drag and Buoyancy in Terrain-Induced Canopy Flows?" Journal of the Atmospheric Sciences 75, no. 3 (February 23, 2018): 775–86. http://dx.doi.org/10.1175/jas-d-17-0161.1.
Abstract Under nonneutral stratification and in the presence of topography, the dynamics of turbulent flow within a canopy is not yet completely understood. This has, among other consequences, serious implications for the measurement of surface–atmosphere exchange by means of eddy covariance: for example, the measurement of carbon dioxide fluxes is strongly influenced if drainage flows occur during night, when the flow within the canopy decouples from the flow aloft. An improved physical understanding of the behavior of scalars under canopy turbulence in complex terrain is urgently needed. In the present work, the authors investigate the dynamics of turbulent flow within sloped canopies, focusing on the slope wind and potential temperature. The authors concentrate on the presence of oscillatory behavior in the flow variables in terms of switching of flow regimes by conducting linear stability analysis. The authors revisit and correct the simplified theory that exists in the literature, which is based on the interplay between the drag force and the buoyancy. The authors find that the simplified description of this dynamical system cannot exhibit the observed richness of the dynamics. To augment the simplified dynamical system’s analysis, the authors make use of large-eddy simulation of a three-dimensional hill covered by a homogeneous forest and analyze the phase synchronization behavior of the buoyancy and drag forces in the momentum budget to explore the turbulent dynamics in more detail.
Дисертації з теми "Dynamical temperature measurement":
1
Mielke, Amy Florence. "DEVELOPMENT OF A MOLECULAR RAYLEIGH SCATTERING DIAGNOSTIC FOR SIMULTANEOUS TIME-RESOLVED MEASUREMENT OF TEMPERATURE, VELOCITY, AND DENSITY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1196429607.
Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2010. ENGLISH ABSTRACT: Regulators and designers of nuclear reactors regard knowledge of the pebble fuel
temperature as important, due to the role that it plays in maintaining structural
integrity and the production of neutrons. By using special fuel assemblies fitted
with measuring equipment it is possible to measure the fuel temperature in
stationary fuel reactors. This, however, is not possible in the pebble bed modular
reactor due to its dynamic core. Designers of the pebble bed modular reactor
have reserved special inspection channel borings inside the center reflector for
fuel temperature measurement. By means of optical fibers and interferometry,
the temperature can be measured inside such a channel. Currently the only way
to control the fuel surface and core temperature is by measuring the gas inlet
and outlet temperatures.
This thesis attempts to determine the pebble temperature by measuring the
temperature in a reflector channel. This is done by constructing an electrically
heated pebble bed experimental setup simulating a cutout section of a pebble
bed modular reactor core. An additional computational fluid dynamics simulation
of the experimental setup was also performed. This thesis also attempts to
determine if there is a measureable temperature peak that can indicate where a
pebble was in contact with the reflector surface. This could then be used in
future studies to determine the pebble fuel velocity as it moves down the reactor
core.
The computational fluid dynamics results were validated by experimental
measurements. In the computational fluid dynamics model and experimental
setup, it was found that there was indeed a measureable temperature difference
on the temperature gradient along the reflector wall. The heat being conducted
away from the pebble through the contact area can explain this. These
differences were only observed when the channel was moved closer to the pebbles and it is therefore advised that some redesigning of the channel should
be done if the in-core temperature is to be accurately interpreted by the
designers at PBMR (Pty) Ltd. AFRIKAANSE OPSOMMING: Reguleerders en ontwerpers van kern reaktore beskou die kennis van die korrel
brandstof temperatuur as belangrik. Dit is weens die rol wat die brandstof
temperatuur speel met die behoud van strukturele integriteit en die produksie
van neutrone binne-in die reaktor. Met behulp van spesiale brandstof montasies
toegerus met die meetings instrumentasie, is dit moontlik om die brandstof
temperatuur in stilstaande brandstof reaktore te meet. Dit is egter nie moontlik
in die korrel bed modulêre reaktor nie, as gevolg van sy dinamiese kern.
Ontwerpers van die korrel bed modulêre reaktor het spesiale kanale in die
binnekant van die middel reflektor vir brandstof temperatuur meeting
gereseveer. Deur middel van optiese vesel en interferometrie, kan die
temperatuur binne so 'n kanaal gemeet word. Tans is die enigste manier om die
brandstof-oppervlak temperatuur te berekern, net moontlik deur gebruik te
maak van die gemete gas inlaat-en uitlaat temperature van die reaktor.
Hierdie tesis poog om vas te stel of die korrel brandstof temperatuur deur die
meet van die oppervlak temperatuur in 'n reflektor-kanaal bepaal kan word. Dit
word gedoen deur 'n elektriese verhitte korrel bed eksperimentele opstelling te
bou wat 'n gedeelte van 'n korrel bed modulêre reaktor simuleer. 'n Bykomende
numeriese simulasie van die eksperimentele opstelling was ook uitgevoer.
Hierdie werk het ook probeer om vas te stel of daar 'n meetbare temperatuur
piek op die temperatuur profiel aandui kan word waar 'n korrel in kontak is met
die reflektor se oppervlak. Dit kan dan in toekomstige studies gebruik word om
te bepaal wat die korrel brandstof spoed was soos dit in die reaktor beweeg.
Die numerise simulasie uitslae was deur eksperimentele metings bevestig. In die
numerise simulasie model en die eksperimentele opstelling, is daar gevind dat
daar inderdaad 'n meetbare temperatuur verskil op die temperatuurgradiënt
teen die reflektor oppervlak is. Dit kan verduidelik word as gevolg van die hitte wat weg van die korrel gelei word deur middel van die kontak area. Hierdie
verskille was slegs waargeneem wanneer die kanaal nader aan die korrels geskuif
is en dit word as n aanbeveling aan PBMR (Pty) Ltd gemaak om sommige
herontwerpe aan die kanaal te doen indien die in-kerntemperatuur gemeet wil
word en akkuraat geinterpreteer wil word.
3
Grossman, Hy. "A New Standard for Temperature Measurement in an Aviation Environment." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604311.
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California Accurate temperature measurement is an essential requirement in modern aircraft data acquisition systems. Both thermocouples and Platinum resistance temperature detectors (RTD) are used for this purpose with the latter being both more accurate and more repeatable. To ensure that only the sensor limits the accuracy of a temperature measurement, end-to-end system accuracy forward of the sensor, should be significantly greater than that of the sensor itself. This paper describes a new digital signal processing (DSP) based system for providing precision RTD based temperature measurements with laboratory accuracy in an aviation environment. Advantages of the new system include, true 3-wire RTD measurement, linear temperature output, on-board ultra-precision resistance standards and transparent dynamic calibration.
4
Gao, Furong. "Measurement, dynamics and control of the mold temperature of injection molding." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=62000.
Abboud, Rita. "Méthode de mesure sans contact de la température intégrée au rotor d’une machine électrique tournante au moyen d’une fibre optique à réseaux de Bragg." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2645.
Dans le domaine des systèmes de transport, des problèmes de chauffage apparaissent avec l'augmentation de la température dans différents types de machines électriques. Dans la conception classique des machines électriques, l'analyse thermique doit être prise en compte dans la conception initiale, le contrôle et la surveillance des machines électriques. La mesure de la température locale, en particulier dans le rotor, est importante pour plusieurs raisons telles que l'extension de la durée de vie des composants de la machine électrique et la localisation des points chauds à l'intérieur de la machine, ce qui permet de développer des systèmes de refroidissement appropriés et de protéger la machine. De nombreuses approches pour la mesure de la température peuvent être utilisées telles que les thermocouples, les thermistances, les capteurs infrarouges ou les caméras infrarouges. Cette thèse présente une technique sans contact qui mesure la température du rotor d'une machine tournante en utilisant un capteur à réseaux de Bragg (FBGs). La surveillance de la température locale, en particulier à l'intérieur du rotor, est importante afin de détecter le vieillissement thermique précoce de la machine. Les points chauds dans les parties rotatives peuvent être localisés en utilisant cette technique. L'originalité principale du travail proposé est de mesurer des températures élevées (70°C) avec une vitesse de rotation élevée (860 RPM) des machines tournantes et surtout d'intégrer le capteur FBG dans un rotor électrique de véhicules à petite échelle géométrique. La réponse du capteur FBG a été simulée en utilisant la méthode de la matrice de transfert (TMM). Ensuite, le FBG a été calibré en utilisant un four de chauffage fabriqué dans notre laboratoire et la température a été modifiée de 20 °C à 70 °C. Une machine rotative avec un FBG intégré a ensuite été conçue et fabriquée. La température du rotor a été modifiée pendant la rotation de la machine. Les décalages de longueur d'onde dus aux variations de température ont été mesurés expérimentalement jusqu'à 860 RPM. Une sensibilité à la température de 4.7 pm/°C a été atteinte expérimentalement. La capacité de ce capteur à surveiller les variations de température du rotor en temps réel a été validée expérimentalement In the transportation system domain, heating problems appear with the temperature increase in different types of electrical machines. In the classical design of electrical machines, thermal analysis should be considered in the initial design, control and monitoring of electrical machines. The measurement of local temperature especially in the rotor is important for several reasons such as extending the lifetime of the electrical machine components, and localizing the hot spots inside the machine which allows the development of appropriate cooling systems and protects the machine. Numerous approaches for temperature measurement can be used such as thermocouples, thermistors, infrared sensors or infra-red cameras. This thesis presents a non-contact technique that measures the temperature of the rotor of a small machine using Fiber Bragg Gratings (FBGs) sensor. Monitoring local temperature especially inside the rotor is important in order to detect early thermal aging of the machine. Hot spot in the rotating parts can be localized by using this technique. The main originality of the proposed work is measuring high temperatures (70°C) with high speed of rotation (860 RPM) of rotating machines and most importantly integrating the FBG sensor into a geometrically small scale electrical rotor of vehicles. The FBG sensor response has been simulated using Transfer matrix method (TMM). After that, the FBG has been calibrated from 20 °C to 70 °C using a heating furnace fabricated at our laboratory. A small rotating machine with embedded FBG has then been designed and fabricated. The temperature of the rotor has been changed while rotating the machine and wavelength shifts due to temperature variations have been experimentally measured up to 860 RPM. A temperature sensitivity of 4.7 pm/°C have been experimentally reached. The ability of this sensor to monitor real time temperature variations of the rotor has been experimentally validated
6
Rothmeier, Greggory H. "Brain tissue temperature dynamics during functional activity and possibilities for optical measurement techniques." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/phy_astr_theses/14.
Regional tissue temperature dynamics in the brain are determined by the balance of the metabolic heat production rate and heat exchange with blood flowing through capillaries embedded in the brain tissue, the surrounding tissues and the environment. Local changes in blood flow and metabolism during functional activity can upset this balance and induce transient temperature changes. Invasive experimental studies in animal models have estab- lished that the brain temperature changes during functional activity are observable and a definitive relationship exists between temperature and brain activity. We present a theoreti- cal framework that links tissue temperature dynamics with hemodynamic activity allowing us to non-invasively estimate brain temperature changes from experimentally measured blood- oxygen level dependent (BOLD) signals. With this unified approach, we are able to pinpoint the mechanisms for hemodynamic activity-related temperature increases and decreases. In addition to these results, the potential uses and limitations of optical measurements are dis- cussed.
7
Osorno, Andres. "Dynamic, In-Situ Pressure Measurements during CMP." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7497.
A rotational setup for measuring interfacial fluid pressure and temperature was successfully constructed. Interfacial fluid measurements were performed with various slurries, slurry flow rates, and pad topographies. It was experimentally determined that the pad topography has the biggest effect in pressure and temperature distribution. This was also confirmed by tilt experiments ran in a rotational environment. For all cases, the edge high conditioned pad displayed the most changes during the experiments.
For an edge high conditioned pad, the fluid pressure was found to be mostly subambient reaching levels of up to 42 kPa at the center of the fixture, and dissipating towards the edges. The pressure maps appear to be almost center symmetric. The pressure was found to be positive during the first second of contact, and rapidly turn subambient. The Subambient pressures stabilize after about 5 seconds, and their suction force was found to slow the rotating platen significantly. Suction forces were confirmed by displacement observed during the tilt experiments. The fixtures center was sucked down into the pad up to 20 m, and tends to tilt towards the leading edge.
Interfacial temperatures were also found to vary with pad geometry. The edge-high conditioned pad exhibited changes of up to 4 C, concentrated at the center. The relative position and shape of these temperature rises matches the results observed in the pressure experiments. Temperature takes a longer time to reach equilibrium, up to 30 seconds in most measurements.
8
Gu, Yuxing. "Measurements of temperature and density profiles of iodine vapor between parallel plates in the transition regime using laser induced fluorescence /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974999.
Khuc, Mai. "Measurement of cicular dichroism dynamics in a temperature jump experiment for the study of protein folding." Palaiseau, Ecole polytechnique, 2011. http://pastel.archives-ouvertes.fr/docs/00/65/62/01/PDF/These_Mai-Thu_KHUC.pdf.
La question de savoir comment les protéines se replient dans leur propre structure tridimentionnelle offre un défi passionnant pour les biophysiciens de nos jours. L'utilisation d'un saut de température rapide est une technique très puissante pour l'étude du processus de dénaturation des protéines. Toutefois, sonder la structure secondaire est un défi difficile et on obtient rarement des valeurs quantitatives. Le but principal de ce projet de thèse est de développer une mise en œuvre technique de dichroïsme circulaire dans l'UV extrême dans une expérience de saut de température nanoseconde. Notre expérience permet de suivre quantitativement l'évolution de la fraction hélicoïdale d'un peptide poly(acide glutamique) au cours de sa dénaturation thermique avec une résolution de 12 ns de temps The question how proteins fold into their specific three-dimentional structures provides an exciting challenge for biophysicists nowadays. The use of a fast temperature-jump is a very powerful technique for the study of the denaturation process of proteins. However, probing the secondary structure is a difficult challenge and rarely yields quantitative values. The main purpose of this PhD project is to develop a technical implementation of far-UV circular dichroism in a nanosecond T-jump experiment. Our CD/T-jump experiment allows us to follow quantitatively the change in the helical fraction of a poly(glutamic acid) peptide during its thermal denaturation with 12 ns time resolution
10
Fallah, Haghmohammadi Hamidreza. "Fever Detection for Dynamic Human Environment Using Sensor Fusion." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37332.
The objective of this thesis is to present an algorithm for processing infrared images and accomplishing automatic detection and path tracking of moving subjects with fever. The detection is based on two main features: the distinction between the geometry of a human face and other objects in the field of view of the camera and the temperature of the radiating object. These features are used for tracking the identified person with fever. The position of camera with respect to direction of motion the walkers appeared to be critical in this process. Infrared thermography is a remote sensing technique used to measure temperatures based on emitted infrared radiation. This application may be used for fever screening in major public places such as airports and hospitals. For this study, we first look at human body and objects in a line of view with different temperatures that would be higher than the normal human body temperature (37.8C at morning and 38.3C at evening). As a part of the experimental study, two humans with different body temperatures walking a path were subjected to automatic fever detection applied for tracking the detected human with fever. The algorithm consists of image processing to threshold objects based on the temperature and template matching used for fever detection in a dynamic human environment.
Stocks, Dana R. Further development of the dynamic gas temperature measurement system. West Palm Beach, FL: Pratt & Whitney, Government Products Division, 1986.
Elmore, D. L. [Further development of the dynamic gas temperature measurement system. [West Palm Beach, FL: Pratt & Whitney, Government Products Division, 1987.
American Society of Mechanical Engineers. Winter Meeting. Pressure and temperature measurements: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Anaheim, California, December 7-12, 1986. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1986.
American Society of Mechanical Engineers. Winter Meeting. Pressure and temperature measurements: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Anaheim, California, December 7-12, 1986. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1986.
Wark, Candace. Development of a temperature measurement system with application to a jet in a cross flow experiment. [Washington, D.C.]: National Aeronautics and Space Administration, 1985.
Bernstein, R. L. Large-scale sea surface temperature variability from satellite and shipboard measurements. [s.l.]: National Aeronautics and Space Administration, 1985.
Johnson, Charles B. Dynamic measurement of total temperature, pressure, and velocity in the Langley 0.3-meter transomic cryogenic tunnel. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.
Johnson, Charles B. Dynamic measurement of total temperature, pressure, and velocity in the Langley 0.3-Meter Transonic Cryogenic Tunnel. Hampton, Va: Langley Research Center, 1986.
Davis, William D. An algorithm for estimating the plume centerline temperature and ceiling jet temperature in the presence of a hot upper layer. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.
Частини книг з теми "Dynamical temperature measurement":
1
Xi, Hongfei, M. J. Huang, W. G. Lynch, M. B. Tsang, J. D. Dinius, S. J. Gaff, C. K. Gelbke, et al. "Nuclear temperature measurement and secondary decay." In Advances in Nuclear Dynamics 3, 53–60. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-4905-5_7.
Petzsche, Thomas, Andy Cook, and Marine Dumont. "Triaxial Accelerometer, High Frequency Measurement and Temperature Stability Considerations." In Special Topics in Structural Dynamics, Volume 6, 333–40. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04729-4_28.
Jackowska-Strumiłło, Lidia. "ANN Based Modelling and Correction in Dynamic Temperature Measurements." In Lecture Notes in Computer Science, 1124–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-24844-6_176.
Mook, H. A., G. Aeppli, S. M. Hayden, Z. Fisk, and D. Rytz. "Neutron Scattering Measurements of the Magnetic Excitations of High-Temperature Superconducting Materials." In Dynamics of Magnetic Fluctuations in High-Temperature Superconductors, 21–34. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-7490-9_2.
Patapis, S. K., M. Ausloos, and Ch Laurent. "Thermodynamic Fluctuations and their Dimensionality in Ceramic Superconductors Out of Transport Properties Measurements." In Dynamics of Magnetic Fluctuations in High-Temperature Superconductors, 207–15. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-7490-9_19.
Ri, S., M. Saka, K. Nanbara, and D. Kobayashi. "Dynamic Thermal Deformation Measurement Technique for Large-Scale High Temperature Piping." In Conference Proceedings of the Society for Experimental Mechanics Series, 65–73. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4235-6_8.
Smith, Jarrod L., Veli-Tapani Kuokkala, Jeremy D. Seidt, and Amos Gilat. "Full-Field Temperature and Strain Measurement in Dynamic Tension Tests on SS 304." In Dynamic Behavior of Materials, Volume 1, 37–44. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41132-3_6.
Zaman, M., K. Kleineidam, L. Bakken, J. Berendt, C. Bracken, K. Butterbach-Bahl, Z. Cai, et al. "Automated Laboratory and Field Techniques to Determine Greenhouse Gas Emissions." In Measuring Emission of Agricultural Greenhouse Gases and Developing Mitigation Options using Nuclear and Related Techniques, 109–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-55396-8_3.
AbstractMethods and techniques are described for automated measurements of greenhouse gases (GHGs) in both the laboratory and the field. Robotic systems are currently available to measure the entire range of gases evolved from soils including dinitrogen (N2). These systems usually work on an exchange of the atmospheric N2with helium (He) so that N2 fluxes can be determined. Laboratory systems are often used in microbiology to determine kinetic response reactions via the dynamics of all gaseous N species such as nitric oxide (NO), nitrous oxide (N2O), and N2. Latest He incubation techniques also take plants into account, in order to study the effect of plant–soil interactions on GHGsand N2 production. The advantage of automated in-field techniques is that GHG emission rates can be determined at a high temporal resolution. This allows, for instance, to determine diurnal response reactions (e.g. with temperature) and GHG dynamics over longer time periods.
9
Takahashi, Norio, and Koji Teshima. "Molecular Beam Time-of-Flight Measurements in A Nearly Freejet Expansion of High Temperature Gas Produced By a Shock Tube." In Rarefied Gas Dynamics, 815–21. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2467-6_14.
Banyai, W. C., D. C. Anacker, X. Y. Wang, D. H. Reitze, G. B. Focht, M. C. Downer, and J. L. Erskine. "Femtosecond Photoemission and Reflectivity Measurements of High Temperature Electron Dynamics in Solid Density Plasmas." In Springer Series in Chemical Physics, 116–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84269-6_36.
Тези доповідей конференцій з теми "Dynamical temperature measurement":
1
remi, gilblas, Thierry Sentenac, Yannick Le Maoult, and Daniel Hernandez. "Non Contact Temperature Field Measurement on Non-Uniform Dynamical Scenes : Contribution of Thermoreflectometry." In The 15th International Heat Transfer Conference. Connecticut: Begellhouse, 2014. http://dx.doi.org/10.1615/ihtc15.min.009132.
Abboud, Rita, Hani Al Hajjar, Alejandro Ospina, Jad Abou Chaaya, Youssef Zaatar, and Frédéric Lamarque. "Distributed dynamical temperature measurement of the rotor of small rotating machines using Fiber Bragg Gratings (FBGs) sensors." In Fiber Optic Sensors and Applications XVII, edited by Glen A. Sanders, Robert A. Lieberman, and Ingrid U. Scheel. SPIE, 2021. http://dx.doi.org/10.1117/12.2585572.
Renaud, Franck, Gael Chevallier, Jean-Luc Dion, and Re´mi Lemaire. "Viscoelasticity Measurement and Identification of Viscoelastic Parametric Models." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47545.
Generally speaking, the behaviour of viscoelastic material is more complicated than the behaviour proposed by classical models as Voigt, Maxwell or Zener. The stiffness of such materials is a frequency dependent complex function. Above 1000Hz, classical measurements techniques are unable to achieve accurate measurements of the stiffness. In this paper, a new Dynamical Mechanical Analysis (DMA) tester is presented. It allows the characterization of the shear stiffness of preloaded viscoelastic materials between 200 and 3500Hz and without using frequency-temperature equivalences. Then the Generalized Maxwell model is used to describe behaviours measured with the DMA tester. A new iterative identification method of the parameter of the Generalized Maxwell model is described. This identification method is based on the asymptotes of the model.
4
Ishibashi, Masahiro. "Fluid Dynamics in Critical Nozzles Revealed by Measurements (Keynote)." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45592.
The paper describes primary calibration of high-precision nozzles (HPNs), which have ideal geometries, at critical condition, theoretical calculation of the discharge coefficient to be verified by the primary calibration, concept of fluid dynamical standard using HPN, precise measurement of boundary layer transition in HPNs in terms of flowrate, superfine structure in the critical flowrate, discrepancy which can occur between primary calibrations and field applications of critical nozzles, and 3D flow velocity field measurements based on recovery temperature, which visualizes many interesting phenomena in axi-symmetric transonic flow as shock interactions, acceleration by edge, reflection of shocks, Fano flow and so on.
5
Zinn, Hanspeter, and Michael Habermann. "Developments and Experiences With Pulsation Measurements for Heavy-Duty Gas Turbines." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27475.
The dynamical combustion processes (pulsations) of heavy-duty gas turbines must be supervised by suitable instrumentation for optimal operation of the engine regarding emissions and component life. But the hostile environment of the combustor makes it difficult to perform the measurements. There are two possible approaches to measure the combustor pulsations. Either a high temperature sensor is placed as close as possible to the combustion chamber to measure the acoustics directly (Cavity Type Probe), or the acoustic signal is led to the outside of the engine by means of a reflection free waveguide, where a dynamic pressure sensor picks up the passing signal (Long Line Probe). Both approaches were developed and investigated in detail. This paper describes the past and current efforts in refining the probe designs for use in the harsh operational environment while maintaining sensor accuracy, measurement range and lifetime as a rugged probe. Theoretical and laboratory investigations were undertaken to increase the useable frequency range of the Cavity Type Probe up to 8kHz under engine operation conditions. This was made possible with a smaller high temperature transducer, which is the result of a cooperative development project with a sensor manufacturer. Experiences with both probe concepts on Alstom’s GT26 Test Power Plant in Birr and on field engines provided clear confirmation that the Cavity Type Probe design with an advanced sensor now fulfils all initially defined requirements of acoustic combustion measurements on heavy-duty gas turbines. On the contrary, the waveguide design principle has fundamental limitations in the direct measurement of the combustion acoustics at gas turbine operating conditions.
6
Barberree, Daniel A. "Dynamically Self-Validating Contact Temperature Sensors." In TEMPERATURE: Its Measurement and Control in Science and Industry; Volume VII; Eighth Temperature Symposium. AIP, 2003. http://dx.doi.org/10.1063/1.1627276.
Gui, Lu, Xiao-Feng Peng, and Xiao-Dong Wang. "Transitional Boiling Characteristics of an Individual Liquid Droplet on the Heated Solid Surface." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21445.
An experimental investigation was conducted to visually observe the transitional boiling in an individual water droplet on heated solid surfaces, with temperature ranging from 120°C to 160°C. Using a high-speed video imaging system, the dynamical process of the evaporation and boiling behavior of a droplet was recorded. Infrared ray temperature measurement technique was employed to investigate the instantaneous characteristics of heat transfer as the droplet was boiled. In the transition boiling regime, the phase change behavior of a droplet displayed a cyclical process. Restricted cyclical, sole-bubble cyclical and metastable cyclical styles were observed as the surface temperature increased.
8
Chang, Fan, Matthias Bayer, Sebastiaan van Putten, and Günther Prokop. "Analysis of Rollover Stability in Consideration of Dynamic Oversteer Tendency." In FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-vdc-041.
"The trends towards increasing popularity of high performance SUVs require a novel assessment of “trade-off” between driving dynamics and rollover stability, which represents a new challenge for chassis design in the concept phase of chassis development. However, the rollover behavior has been typically investigated by means of experimental test maneuvers with prototype vehicles, which require a large amount of resources, such as measuring equipment, outrigger and roof loading. Besides, measurement data with measurement errors do not always provide satisfactory results due to external disturbance factors, e.g. environmental temperature and road surface. By contrast, a simulation environment can rule out the part of the aforementioned disturbance factors by reproducible simulation maneuvers in order to reduce the development expenses and obtain a better understanding of the rollover behavior. Within a cooperation project between Audi AG (Germany) and TU Dresden (Germany) five previous works have focused on the vehicle modeling, model verification, validation, analysis methodology and physical effect chains analysis for rollover behavior. However, a study into existing literature reveals that the interaction between yaw instability and roll instability has not been investigated sufficiently to date. Especially the question arises, to what extent the oversteer tendency (lateral instability) affects the rollover behavior (roll instability). Therefore, this paper aims to analyze the motion couplings between yaw and roll dynamics to explain the interrelation between oversteer tendency and rollover behavior, using the developed nonlinear two-track model with full axle kinematics and compliance, a dynamic steering and a nonlinear tire model. Firstly, a new criterion to describe the dynamical oversteer tendency in the nonlinear limit range of driving dynamics has been defined, which can be regarded as a further development of the traditional definitions of oversteer tendency in the linear range. Secondly, the rollover criticality has been quantified by means of a new maneuver in order to gain a comprehensive comparison between different vehicle configurations. Subsequently, different chassis parameters of the reference vehicle have been varied to investigate the relationship between driving performance and rollover stability. Finally, the results of the study are interpreted and discussed. Through analysis in this paper, the driving dynamics both in the linear and nonlinear range are evaluated to identify the operation principles between dynamical oversteer tendency and the rollover behavior. Summarizing the acquired know-how together, recommendations for design targets in the early phase of chassis development are derived. Newsworthy: 1. A new criterion to describe the dynamical oversteer tendency in the nonlinear limit range of driving dynamics 2. Systematical investigation of the interaction between oversteer tendency and rollover behavior 3. Parameter study to build up the understanding of the nonlinear physical chains of rollover behavior"
9
Tripathi, Abhinav, Chen Zhang, and Zongxuan Sun. "Experimental Investigation and Analysis of Auto-Ignition Combustion Dynamics." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-9184.
From engine controls’ perspective, understanding autoignition dynamics is a key to enabling new combustion modes for internal combustion engines, especially for renewable fuels. Conventional autoignition investigations of fuels commonly involve a rapid compression of oxidizer-fuel mixture to a desired set of temperature-pressure conditions in a rapid compression machine (RCM), and subsequent measurement of the ignition delay. However, even for relatively close thermal states at the compressed condition, different thermodynamic paths (pressure-temperature histories) may lead to significantly different chemical kinetic states and hence significantly different ignition delay measurements. Currently, there exists no systematic method to study this path dependence of auto-ignition. In this work we present, for the first time, a systematic framework for investigation of the effect of small perturbations in the thermo-kinetic states, caused by perturbing the thermodynamic path of compression, on the ignition delay of fuels from a dynamical systems perspective. First, we introduce a novel controlled trajectory rapid compression and expansion machine (CT-RCEM) which offers the ability to precisely control the piston trajectory during compression of the fuel-oxidizer mixture, allowing the thermodynamic path to be tailored as desired. We use the CT-RCEM to experimentally investigate the influence of compression trajectory perturbation on the ignition delay of a specific fuel — dimethyl-ether (DME). Next, using a reduced order model of the combustion dynamics in the CT-RCEM that we developed, we investigate the evolution of the perturbation in the thermo-kinetic states resulting from trajectory perturbation to explain the experimental observations. Finally, we show that the sensitivity of auto-ignition to the thermodynamic path perturbation essentially arises from changes in the chemical reaction rates due to different amounts of intermediate species buildup for different thermodynamic paths.
10
Dolan, D. H., T. Ao, and C. T. Seagle. "Reflectance thermometry in dynamic compression experiments." In TEMPERATURE: ITS MEASUREMENT AND CONTROL IN SCIENCE AND INDUSTRY, VOLUME 8: Proceedings of the Ninth International Temperature Symposium. AIP, 2013. http://dx.doi.org/10.1063/1.4819639.
Звіти організацій з теми "Dynamical temperature measurement":
1
Dolan, Daniel H.,, Christopher Seagle, and Tommy Ao. Dynamic temperature measurements with embedded optical sensors. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1096517.
Rose, Jonathan, Wolfgang Klebsch, and Juergen Wolf. Temperature Measurement and Equilibrium Dynamics of Simulated Annealing Placements. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada207230.
Ao, Tommy, Eric Harding, James E. Bailey, David E. Bliss, Daniel H. Dolan III, Marcus D. Knudson, and John F. Benage, Jr. Progress and Improvements on Temperature Measurements for Dynamic and Advanced Certification Materials Experiments on Z. Office of Scientific and Technical Information (OSTI), November 2014. http://dx.doi.org/10.2172/1561683.
Banin, Amos, Joseph Stucki, and Joel Kostka. Redox Processes in Soils Irrigated with Reclaimed Sewage Effluents: Field Cycles and Basic Mechanism. United States Department of Agriculture, July 2004. http://dx.doi.org/10.32747/2004.7695870.bard.
The overall objectives of the project were: (a) To measure and study in situ the effect of irrigation with reclaimed sewage effluents on redox processes and related chemical dynamics in soil profiles of agricultural fields. (b) To study under controlled conditions the kinetics and equilibrium states of selected processes that affect redox conditions in field soils or that are effected by them. Specifically, these include the effects on heavy metals sorption and desorption, and the effect on pesticide degradation. On the basis of the initial results from the field study, increased effort was devoted to clarifying and quantifying the effects of plants and water regime on the soil's redox potential while the study of heavy metals sorption was limited. The use of reclaimed sewage effluents as agricultural irrigation water is increasing at a significant rate. The relatively high levels of suspended and, especially, dissolved organic matter and nitrogen in effluents may affect the redox regime in field soils irrigated with them. In turn, the changes in redox regime may affect, among other parameters, the organic matter and nitrogen dynamics of the root zone and trace organic decomposition processes. Detailed data of the redox potential regime in field plots is lacking, and the detailed mechanisms of its control are obscure and not quantified. The study established the feasibility of long-term, non-disturbing monitoring of redox potential regime in field soils. This may enable to manage soil redox under conditions of continued inputs of wastewater. The importance of controlling the degree of wastewater treatment, particularly of adding ultrafiltration steps and/or tertiary treatment, may be assessed based on these and similar results. Low redox potential was measured in a field site (Site A, KibutzGivat Brenner), that has been irrigated with effluents for 30 years and was used for 15 years for continuous commercial sod production. A permanently reduced horizon (Time weighted averaged pe= 0.33±3.0) was found in this site at the 15 cm depth throughout the measurement period of 10 months. A drastic cultivation intervention, involving prolonged drying and deep plowing operations may be required to reclaim such soils. Site B, characterized by a loamy texture, irrigated with tap water for about 20 years was oxidized (Time weighted average pe=8.1±1.0) throughout the measurement period. Iron in the solid phases of the Givat Brenner soils is chemically-reduced by irrigation. Reduced Fe in these soils causes a change in reactivity toward the pesticide oxamyl, which has been determined to be both cytotoxic and genotoxic to mammalian cells. Reaction of oxamyl with reduced-Fe clay minerals dramatically decreases its cytotoxicity and genotoxicity to mammalian cells. Some other pesticides are affected in the same manner, whereas others are affected in the opposite direction (become more cyto- and genotoxic). Iron-reducing bacteria (FeRB) are abundant in the Givat Brenner soils. FeRB are capable of coupling the oxidation of small molecular weight carbon compounds (fermentation products) to the respiration of iron under anoxic conditions, such as those that occur under flooded soil conditions. FeRB from these soils utilize a variety of Fe forms, including Fe-containing clay minerals, as the sole electron acceptor. Daily cycles of the soil redox potential were discovered and documented in controlled-conditions lysimeter experiments. In the oxic range (pe=12-8) soil redox potential cycling is attributed to the effect of the daily temperature cycle on the equilibrium constant of the oxygenation reaction of H⁺ to form H₂O, and is observed under both effluent and freshwater irrigation. The presence of plants affects considerably the redox potential regime of soils. Redox potential cycling coupled to the irrigation cycles is observed when the soil becomes anoxic and the redox potential is controlled by the Fe(III)/Fe(II) redox couple. This is particularly seen when plants are grown. Re-oxidation of the soil after soil drying at the end of an irrigation cycle is affected to some degree by the water quality. Surprisingly, the results suggest that under certain conditions recovery is less pronounced in the freshwater irrigated soils.
