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Journal articles on the topic 'Limited volume chamber'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Townsend, Meredith, and Christian Huber. "A critical magma chamber size for volcanic eruptions." Geology 48, no. 5 (2020): 431–35. http://dx.doi.org/10.1130/g47045.1.

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Abstract We present a model for a coupled magma chamber–dike system to investigate the conditions required to initiate volcanic eruptions and to determine what controls the size of eruptions. The model combines the mechanics of dike propagation with internal chamber dynamics including crystallization, volatile exsolution, and the elastic response of the magma and surrounding crust to pressure changes within the chamber. We find three regimes for dike growth and eruptions: (1) below a critical magma chamber size, eruptions are suppressed because chamber pressure drops to lithostatic before a di

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Bahhous, Karim, Zakaria Aboulbanine, Mustapha Zerfaoui, Amine El Outmani, and Naïma El Khayati. "Optimization of the iterative deconvolution correction method applied to ionization chamber response for small field dosimetry measurements." Journal of Instrumentation 17, no. 09 (2022): P09019. http://dx.doi.org/10.1088/1748-0221/17/09/p09019.

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Abstract This study aims to optimize the iterative deconvolution correction of air-filled ionization chamber measurements with limited spatial resolution for photon beam dosimetry. The ionization chamber volume effect could be explained by the inhomogeneity of the absorbed dose in its sensitive volume, leading to a volume averaging effect acting as a convolution kernel K(x). Therefore, the “true” dose profile Pt(x) can be deduced by deconvolving measured 1D profiles Pm(x). The Semiflex 3D ionization chamber type PTW 31021 was studied for beams with flattening filter (WFF), while the SNC125c io

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Dmytriv, Taras. "DYNAMIC MODEL OF THE DURATION OF GASEOUS ENVIRONMENT PUMPING FROM A LIMITED VOLUME." Ukrainian Journal of Mechanical Engineering and Materials Science 9, no. 4 (2023): 12–19. http://dx.doi.org/10.23939/ujmems2023.04.012.

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An analytical equation for the duration of air pumping from a limited volume has been developed. The equation of the mechanical energy of air movement takes into account the law of mass conservation for a gas in a controlled volume, the work of the energy of air movement and the work to overcome air friction. Gaseous medium is Newtonian. The duration of pumping (filling) the limited volume of the pneumatic chamber with air was calculated by comparing the mass flow per second and the increase in mass, as a differential of the change in air density. The mathematical model enables the simulation

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Lefebvre, O., A. Al-Mamun, and H. Y. Ng. "A microbial fuel cell equipped with a biocathode for organic removal and denitrification." Water Science and Technology 58, no. 4 (2008): 881–85. http://dx.doi.org/10.2166/wst.2008.343.

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Microbial fuel cells (MFCs) are a promising anaerobic technology but they are limited by the high cost of the catalyst used at the cathode (typically platinum). In this study, we designed a novel type of two-chambered MFC wherein an autoheterotrophic denitrifying biofilm replaced the costly catalyst on the cathode surface. Micro-organisms performed denitrification by using electrons supplied by bacteria oxidizing domestic wastewater and acetate as substrates in the anode chamber. This two-chambered MFC equipped with a biocathode generated during more than 1.5 month up to 9.4 mW m−2 of anode su

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Arafati, Arghavan, Daisuke Morisawa, Michael R. Avendi, et al. "Generalizable fully automated multi-label segmentation of four-chamber view echocardiograms based on deep convolutional adversarial networks." Journal of The Royal Society Interface 17, no. 169 (2020): 20200267. http://dx.doi.org/10.1098/rsif.2020.0267.

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A major issue in translation of the artificial intelligence platforms for automatic segmentation of echocardiograms to clinics is their generalizability. The present study introduces and verifies a novel generalizable and efficient fully automatic multi-label segmentation method for four-chamber view echocardiograms based on deep fully convolutional networks (FCNs) and adversarial training. For the first time, we used generative adversarial networks for pixel classification training, a novel method in machine learning not currently used for cardiac imaging, to overcome the generalization probl

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Batishcheva, KSENIA A., and ATLANT E. Nurpeiis. "WATER DROPLET EVAPORATION IN A CHAMBER ISOLATED FROM THE EXTERNAL ENVIRONMENT." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 6, no. 3 (2020): 8–22. http://dx.doi.org/10.21684/2411-7978-2020-6-3-8-22.

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With an increase in the productivity of power equipment and the miniaturization of its components, the use of traditional thermal management systems becomes insufficient. There is a need to develop drip heat removal systems, based on phase transition effects. Cooling with small volumes of liquids is a promising technology for microfluidic devices or evaporation chambers, which are self-regulating systems isolated from the external environment. However, the heat removal during evaporation of droplets into a limited volume is a difficult task due to the temperature difference in the cooling devi

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Bom, N., A. F. W. van der Steen, and Y. F. M. Nosir. "Studies of cardiac function and myocardial tissue characterization." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 214, no. 2 (2000): 141–49. http://dx.doi.org/10.1243/0954411001535318.

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The heart can be studied using ultrasound techniques. The shape of the heart, its chambers, wall thicknesses, wall tissue characteristics as well as motion of walls and valve leaflets are all diagnostic information. In addition, the blood velocity and its timing within the cardiac cycle is an important diagnostic tool. In the present paper focus will be limited to the analysis of the left ventricular function as observed with two-dimensional and three-dimensional echocardiography and the characteristics of backscattered ultrasound information from the left ventricular chamber wall. Function of

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Konuhova, Marina, Valerijs Bezrukovs, Vladislavs Bezrukovs, et al. "Numerical Simulations of Scaling of the Chamber Dimensions of the Liquid Piston Compressor for Hydrogen Applications." Technologies 13, no. 6 (2025): 226. https://doi.org/10.3390/technologies13060226.

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Hydrogen compression is a critical process in hydrogen storage and distribution, particularly for energy infrastructure and transportation. As hydrogen technologies expand beyond limited industrial applications, they are increasingly supporting the green economy, including offshore energy systems, smart ports, and sustainable marine industries. Efficient compression technologies are essential for ensuring reliable hydrogen storage and distribution across these sectors. This study focuses on optimizing hydrogen compression using a Liquid Piston Hydrogen Compressor through numerical simulations

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Heister, Stephen D., John Smallwood, Alexis Harroun, Kevin Dille, Ariana Martinez, and Nathan Ballintyn. "Rotating Detonation Combustion for Advanced Liquid Propellant Space Engines." Aerospace 9, no. 10 (2022): 581. http://dx.doi.org/10.3390/aerospace9100581.

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Rotating (also termed continuous spin) detonation technology is gaining interest in the global research and development community due to the potential for increased performance. Potential performance benefits, thrust chamber design, and thrust chamber cooling loads are analyzed for propellant applications using liquid oxygen or high-concentration hydrogen peroxide oxidizers with kerosene, hydrogen, and methane fuels. Performance results based on a lumped parameter treatment show that theoretical specific impulse gains of 3–14% are achievable with the highest benefit coming from hydrogen-fueled

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Smirnov, A. P., O. V. Khvoshchan, and T. D. Denisyuk. "Investigation of the Influence of a Limited Volume on the Pulsation of a Vapor-Gas Cavity During a High-Voltage Electric Explosion in a Liquid." Elektronnaya Obrabotka Materialov 60, no. 2 (2024): 40–49. http://dx.doi.org/10.52577/eom.2024.60.2.40.

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The influence of a limited volume on the hydrodynamic post-discharge processes during a high-voltage electric explosion (HVEE) and an explosion of a thin initiating conductor (ETIC) in a liquid is estimated, and the dynamics of a vapor-gas cavity (VGC) under those conditions is studied. Experimental studies have shown the advantage of the HVEE in comparison with the ETIC in terms of the energy contributed into the VGC expressed in an increase of the period of the VGC pulsation up to 55%. It was noted that with the ETIC in a limited volume of the discharge chamber, the period of pulsation of th

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Weihsbach, Christian, Nora Vogt, Ziad Al-Haj Al-Haj Hemidi, et al. "AcquisitionFocus: Joint Optimization of Acquisition Orientation and Cardiac Volume Reconstruction Using Deep Learning." Sensors 24, no. 7 (2024): 2296. http://dx.doi.org/10.3390/s24072296.

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In cardiac cine imaging, acquiring high-quality data is challenging and time-consuming due to the artifacts generated by the heart’s continuous movement. Volumetric, fully isotropic data acquisition with high temporal resolution is, to date, intractable due to MR physics constraints. To assess whole-heart movement under minimal acquisition time, we propose a deep learning model that reconstructs the volumetric shape of multiple cardiac chambers from a limited number of input slices while simultaneously optimizing the slice acquisition orientation for this task. We mimic the current clinical pr

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Semar, Djainuddin, and Nur Ahadiat. "THE INFLUENCE OF GASOLINE’S AROMATIC CONTENT ON ENGINE COMBUSTION CHAMBER DEPOSIT FORMING." Scientific Contributions Oil and Gas 30, no. 1 (2022): 41–48. http://dx.doi.org/10.29017/scog.30.1.973.

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Aromatic content in gasoline fuels should be limited due to its influencies to the cleanessof engine combustion chamber and emission of carbon monoxide, carbon dioxide andhidrocarbon. Ussually the highest aromatic content mean more higher its benzene contentand it will couse increase of air pullotion. According to specification of gasoline 91(SKNo. 3674 k/24/DJM/2006), maximum aromatic content is 50 % volume. Those specificationconform to catagory 1 of World Wide Fuel Charter (WWFC). However, aromatic and benzenecontent test on domestic gasoline in Indonesia obviously fulfil maximum limit for

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Bahgat, Mohammed, Leon Lindsey, Paul Lindsey, and Andrew Knight. "Aerosol Generation in Ear Canal and Air-Fluid Interface Suction." OTO Open 5, no. 3 (2021): 2473974X2110271. http://dx.doi.org/10.1177/2473974x211027125.

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Objective The identification of aerosol-generating procedures (AGPs) is important during the current SARS-CoV-2 pandemic due to aerosol-mediated virus transmission. Aerosol measurement during clinical procedures using particle counting may be confounded by variable natural background aerosol levels or limited by partial volume sampling. The study objective was to quantify any significant aerosol generated from simulated suction clearance procedures. Study Design Prospective quantification of aerosol generation during clinical suction simulation. Setting Clean chamber. Methods We created a clea

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Nakao, S., Y. Liu, P. Tang, C. L. Chen, J. Zhang, and D. R. Cocker III. "Chamber studies of SOA formation from aromatic hydrocarbons: observation of limited glyoxal uptake." Atmospheric Chemistry and Physics 12, no. 9 (2012): 3927–37. http://dx.doi.org/10.5194/acp-12-3927-2012.

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Abstract. This study evaluates the significance of glyoxal acting as an intermediate species leading to secondary organic aerosol (SOA) formation from aromatic hydrocarbon photooxidation under humid conditions. Rapid SOA formation from glyoxal uptake onto aqueous (NH4)2SO4 seed particles is observed in agreement with previous studies; however, glyoxal did not partition significantly to SOA (with or without aqueous seed) during aromatic hydrocarbon photooxidation within an environmental chamber (RH less than 80%). Rather, glyoxal influences SOA formation by raising hydroxyl (OH) radical concent

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Raharjani, Sophie Anggitta Raharjani, Afandi Faris Aiman, Meirifa Rizanti, Devy Naviana Devy Naviana, Kevin Amadeus Sumendap Kevin Amadeus Sumendap, and Rizkita Rachmi Esyanti Rizkita Rachmi Esyanti. "Bamboo Fruit Storage Chamber (FSC) Equipped with Ethylene-Degrading Manganese Doped Titanium Oxide Nanomaterial as Storage for Banana (Musa acuminata)." Sains Malaysiana 51, no. 9 (2022): 2885–95. http://dx.doi.org/10.17576/jsm-2022-5109-12.

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As a climacteric fruit, banana undergoes rapid ripening induced by the hormone ethylene, which is produced by autocatalytic reactions. Titanium dioxide is a photocatalytic compound with the ability to degrade ethylene to water and carbon dioxide. This compound can be used to control the concentration of ethylene inside storage chambers to delay the ripening process of bananas in storage. A passive modified atmosphere is another method to delay ripening by using storage spaces with limited air flow. This study attempts to investigate the performance of TiO2-Mn and bamboo fruit storage chamber (

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16

Kosenkov, V. "Influence of Vapor-Gas Cavity on Pressure Field in Closed Discharge Chamber with Rigid Walls." Elektronnaya Obrabotka Materialov 57, no. 3 (2021): 102–16. http://dx.doi.org/10.52577/eom.2021.57.3.102.

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The pressure field in discharge chambers of a limited volume with deformable walls very often has a great influence on the efficiency of technological processes of deformation of sheet alloys; therefore, its determination is an urgent task. As a result of an electric discharge in the liquid filling the discharge chamber, in it, a cavity with a higher compressibility is formed than the liquid in the chamber. At the stage of the discharge, this cavity is filled with non-ideal plasma, and after the discharge, with liquid vapor and gases dissolved in it (vapor-gas cavity). Its pulsations form a pr

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Kosenkov, V.M. "Influence of Vapor-Gas Cavity on Pressure Field in Closed Discharge Chamber with Rigid Walls." Электронная oбработка mатериалов 3-4, no. 56 (2020): 42–52. https://doi.org/10.5281/zenodo.3970429.

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The pressure field in discharge chambers of a limited volume, with rigid walls, very often has a great influence on the efficiency of technological processes; therefore, its determination is an urgent task. As a result of the electric discharge in the liquid filling of the discharge chamber, in it, a cavity with a higher compressibility is formed than the liquid in the chamber. At the discharge stage, this cavity is filled with non-ideal plasma, and after discharge, liquid vapor and gases are dissolved in it (vapor-gas cavity). Its pulsations form a pressure field in the discharge chamber. The

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18

Fang, Lijia, Hardeep Singh, Takuma Ohashi, et al. "Effect of Machine Learning Algorithms on Prediction of In-Cylinder Combustion Pressure of Ammonia–Oxygen in a Constant-Volume Combustion Chamber." Energies 17, no. 3 (2024): 746. http://dx.doi.org/10.3390/en17030746.

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Road vehicles, particularly cars, are one of the primary sources of CO2 emissions in the transport sector. Shifting to unconventional energy sources such as solar and wind power may reduce their carbon footprints considerably. Consequently, using ammonia as a fuel due to its potential benefits, such as its high energy density, being a carbon-free fuel, and its versatility during storage and transportation, has now grabbed the attention of researchers. However, its slow combustion speed, larger combustion chamber requirements, ignition difficulties, and limited combustion stability are still ma

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Chung, D. C., S. C. Niranjan, J. W. Clark, et al. "A dynamic model of ventricular interaction and pericardial influence." American Journal of Physiology-Heart and Circulatory Physiology 272, no. 6 (1997): H2942—H2962. http://dx.doi.org/10.1152/ajpheart.1997.272.6.h2942.

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A mathematical model describing the dynamic interaction between the left and the right ventricle over the complete cardiac cycle is presented. The pericardium-bound left and right ventricles are represented as two coupled chambers consisting of the left and right free walls and the interventricular septum. Time-varying pressure-volume relationships characterize the component compliances, and the interaction of these components produces the globally observed ventricular pump properties (total chamber pressure and volume). The model 1) permits the simulation of passive (diastolic) and active (sy

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Easton, D. M. "Muscle chamber with strain gauge adapted for isotonic/isometric recording." Advances in Physiology Education 270, no. 6 (1996): S29. http://dx.doi.org/10.1152/advances.1996.270.6.s29.

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Simple devices are described that can facilitate student experiments on mechanical and electrical aspects of muscle contraction, for example, of isolated preparations such as frog gastrocnemius and sartorius muscles and gut. The system includes a general-purpose preparation bath that was previously described for electrophysiological observations with suction electrodes [D.M. Easton. Am.J. Physiol. 265 (Adv. Physiol.Educ. 10): S35-S46, 1993]. A tower installed in the bath allows the muscle to be oriented vertically but completely submerged in a limited volume. Recording of isotonic contraction,

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Kosenkov, V. M. "Effect of a Vapor-Gas Cavity on the Pressure Field in a Limited-Volume Discharge Chamber with Rigid Walls." Surface Engineering and Applied Electrochemistry 57, no. 2 (2021): 197–206. http://dx.doi.org/10.3103/s1068375521020046.

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Belavič, Darko, Marko Hrovat, Kostja Makarovič, et al. "3D LTCC structure for a large-volume cavity-type chemical microreactor." Microelectronics International 32, no. 3 (2015): 133–37. http://dx.doi.org/10.1108/mi-01-2015-0011.

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Purpose – The purpose of this paper is to present the research activity and results to research and development society on the field of ceramic microsystems. Design/methodology/approach – The chemical reactor was developed as a non-conventional application of low temperature co-fired ceramic (LTCC) and thick-film technologies. In the ceramic reactor with a large-volume, buried cavity, filled with a catalyst, the reaction between water and methanol produces hydrogen and carbon dioxide (together with traces of carbon monoxide). The LTCC ceramic three-dimensional (3D) structure consists of a reac

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Bermejo, Javier, Raquel Yotti, Candelas Pérez del Villar, et al. "Diastolic chamber properties of the left ventricle assessed by global fitting of pressure-volume data: improving the gold standard of diastolic function." Journal of Applied Physiology 115, no. 4 (2013): 556–68. http://dx.doi.org/10.1152/japplphysiol.00363.2013.

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In cardiovascular research, relaxation and stiffness are calculated from pressure-volume (PV) curves by separately fitting the data during the isovolumic and end-diastolic phases (end-diastolic PV relationship), respectively. This method is limited because it assumes uncoupled active and passive properties during these phases, it penalizes statistical power, and it cannot account for elastic restoring forces. We aimed to improve this analysis by implementing a method based on global optimization of all PV diastolic data. In 1,000 Monte Carlo experiments, the optimization algorithm recovered en

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Курочкин, Анатолий, and Anatolii A. Kurochkin. "IMPROVEMENT OF EXTRUDER WORKING PROCESS WITH TERMOVACUAL EFFECT." Bulletin Samara State Agricultural Academy 4, no. 2 (2019): 84–89. http://dx.doi.org/10.12737/article_5cdbc0837a1bc3.84520731.

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The research aim is a theoretical substantiation of the increase in the efficiency of extrudate dehydration due to the supply of air into the vacuum chamber of a modernized extruder with a thermal vacuum working process. On the basis of modern study of the implementation of the thermodynamic process in the interaction of three different air flows in a limited volume of the vacuum chamber of the extruder, one possible way of increasing the efficiency of the finished product dehydration was theoretically justified. In the previously proposed constructive-technological scheme of the extruder, the

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Haider, R., and S. Haider. "Overestimated COD values for raw wastewaters extracted by vacuum sampling devices due to sedimentation effects." Water Science and Technology 37, no. 12 (1998): 293–300. http://dx.doi.org/10.2166/wst.1998.0554.

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Automatic vacuum sampling devices are frequently used to obtain representative samples of raw wastewaters. As a relatively high frequency of sampling is desired to cover the full range of load fluctuations and the volume of a composite sample is generally limited, the volume used from each sampling event is significantly less than that actually extracted by the sampler. On 5 different wastewater treatment plants the authors have found that the COD concentration in the sample volume used for analyses was significantly higher than that in the sample volume wasted by the vacuum sampler. It is hyp

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Chang, Y.-C., L.-J. Yeh, and M.-C. Chiu. "Shape optimization on double-chamber mufflers using a genetic algorithm." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 219, no. 1 (2005): 31–42. http://dx.doi.org/10.1243/095440605x8351.

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In an effort to meet the demands of operation and maintenance inside a constrained machine room, the volume of the muffler system is often compromised. Therefore, the need to enhance the level of muffler performance under limited space conditions becomes even more expedient in the field of practical engineering work. The present paper proposes a novel scheme for the shape optimization of double-chamber mufflers by using a genetic algorithm (GA). The new approach utilizes the four-pole transfer matrix - a technique for evaluating the sound transmission loss (STL) on the basis of plane wave theo

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Anand, Vidhu, Rosalyn O. Adigun, Jeremy T. Thaden, et al. "Predictive value of left ventricular diastolic chamber stiffness in patients with severe aortic stenosis undergoing aortic valve replacement." European Heart Journal - Cardiovascular Imaging 21, no. 10 (2019): 1160–68. http://dx.doi.org/10.1093/ehjci/jez292.

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Abstract Aims Despite improvements in cardiac haemodynamics and symptoms, long-term mortality remains increased in some patients after aortic valve replacement (AVR). Limited data exist on the prognostic role of left ventricular (LV) chamber stiffening in these patients. Methods and results We performed a retrospective analysis in 1893 patients with severe aortic stenosis (AS) referred for AVR. LV end-diastolic pressure–volume relations (EDPVR, P = αV^β) were reconstructed from echocardiographic measurements of end-diastolic volumes and estimates of end-diastolic pressure (EDP). The impact of

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Peverill, Roger E. "Understanding preload and preload reserve within the conceptual framework of a limited range of possible left ventricular end-diastolic volumes." Advances in Physiology Education 44, no. 3 (2020): 414–22. http://dx.doi.org/10.1152/advan.00043.2020.

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Preload has been variously defined, but if there is to be a direct relationship with activity of the Frank-Starling mechanism in its action to increase the force and extent of contraction, preload must directly reflect myocardial stretch. The Frank-Starling mechanism is activated during any stretch of a cardiac chamber beyond its resting size, which is present immediately before contraction. Every left ventricle has an intrinsic and limited range of possible volumes at end diastole. There is a curvilinear relationship between left ventricular (LV) end-diastolic pressure (LVEDP) and LV end-dias

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Yu, Chen, Yongjiu Zhao, Huijuan Dai, et al. "Improving the Reverberation Chamber Performance Using a Reconfigurable Source Stirring Antenna Array." Electronics 11, no. 9 (2022): 1462. http://dx.doi.org/10.3390/electronics11091462.

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An antenna array composed of 16 asymmetric distributed monopoles on a circular dielectric substrate is proposed to use as a reconfigurable source stirrer in a reverberation chamber (RC). The distance between antennas is above λ2 to ensure the isolation between antennas below −15 dB. In order to ensure the mutual independence of the stirring modes of the antenna array, the 16 monopoles are asymmetrically distributed on both sides with X and Y as axes. The stirring efficiency of a stirrer is related to its size, and usually a higher stirring efficiency means a larger stirrer. The source stirring

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Karimi, Abdullah, and M. Razi Nalim. "Ignition by Hot Transient Jets in Confined Mixtures of Gaseous Fuels and Air." Journal of Combustion 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/9565839.

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Ignition of a combustible mixture by a transient jet of hot reactive gas is important for safety of mines, prechamber ignition in IC engines, detonation initiation, and novel constant-volume combustors. The present work is a numerical study of the hot jet ignition process in a long constant-volume combustor (CVC) that represents a wave rotor channel. The hot jet of combustion products from a prechamber is injected through a converging nozzle into the main CVC chamber containing a premixed fuel-air mixture. Combustion in a two-dimensional analogue of the CVC chamber is modeled using a global re

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Laidoudi, Houssem, and Houssem Laidoudi. "MIXED CONVECTION BETWEEN HOT AND COLD CYLINDERS IN SQUARE CHAMBER: STUDY THE DIRECTION AND VALUE OF THE ROTATIONAL SPEED." Acta Mechanica Malaysia 5, no. 2 (2022): 01–05. http://dx.doi.org/10.26480/amm.01.2022.01.05.

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This paper studies the heat transfer between two cylinders held in a square-shaped and thermally insulated chamber. The two cylinders rotate at constant speed. The right cylinder has a hot wall the left one is cold. The chamber is filled with water (Pr = 6.01) for the purpose of transferring heat between the two cylinders. The heat pattern used in this research is convective and mixed, so the values of the studied Richardson number are limited between 0 and 1. The speed of rotation of the cylinders is expressed by Re number. The experiment was carried out in numerical way based on the finite-v

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de Simone, Giovanni, Richard B. Devereux, Antonello Ganau, et al. "Estimation of left ventricular chamber and stroke volume by limited M-mode echocardiography and validation by two-dimensional and doppler echocardiography." American Journal of Cardiology 78, no. 7 (1996): 801–7. http://dx.doi.org/10.1016/s0002-9149(96)00425-0.

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Zakharova, V. P., A. A. Balabai, L. O. Stechenko, O. A. Krykunov, and O. V. Rudenko. "Morphological Aspects of Myocardial Remodeling under Conditions of its Volume Overload." Ukrainian journal of cardiovascular surgery, no. 3 (40) (September 18, 2020): 93–97. http://dx.doi.org/10.30702/ujcvs/20.4009/045093-097/076.

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Background. Myocardial overload occurs in situations when one or another heart chamber receives excess blood during diastole. Most often it occurs as a result of insufficiency of aortic or atrioventricular valves. Changes in cardiomyocytes (CMs) are regarded as compensatory, and the way myocardial remodeling with volume overload passes into the stage of decompensation still remains unexplored. The aim. To determine the morphological signs of adaptation and maladaptation of the myocardium to its volume overload. Materials and methods. Four hearts obtained at autopsy from patients wh

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Maslanka, Tomasz, Piotr Socha, Michał Dąbrowski, Natalia Ziółkowska, and Hubert Ziółkowski. "CD8+ single positive and CD4+CD8+ double positive cells constitute a significant proportion of the total lymphocytes in the anterior chamber of the normal porcine eye." Journal of Immunology 200, no. 1_Supplement (2018): 59.13. http://dx.doi.org/10.4049/jimmunol.200.supp.59.13.

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Abstract This study investigated whether CD4− and CD8-expressing cells are present in the anterior chamber of the normal porcine eye. Intact porcine globes were obtained from local slaughterhouses. They did not show any abnormalities or signs of disease. The cornea was incised and then aqueous humor (AH) from both globes of the same animal was collected. The lymphocyte population in peripheral blood was gated on the basis of forward and side scatter properties. The positioning of this gate served as a reference for setting the lymphocyte gate in AH samples. The number of lymphocytes in the ant

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Douma, Marie, Musong Katche, Nicole Telem, et al. "Concrete-Based Dual-Chamber Microbial Fuel Cell for Continuous Power Generation." American Journal of Electrical Power and Energy Systems 14, no. 1 (2025): 11–19. https://doi.org/10.11648/j.epes.20251401.12.

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The increasing demand for sustainable electricity generation necessitates the exploration of innovative technologies. Biomass technology is emerging as a promising alternative to address the energy crisis for low-power devices and reduce reliance on fossil fuels. One of the methods to generate energy from this biomass is by using microbial fuel cells (MFC). However, the efforts made with this technology are still mainly limited at the laboratory scale, limiting its interest and its utilization for electrical power generation. This paper presents the real-life implementation and feasibility of

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Makarchuk, O., and D. Calus. "RESEARCH OF THE PERFORMANCE INDICATOR OF AN ELECTROMAGNETIC MILL." Tekhnichna Elektrodynamika 2022, no. 1 (2022): 50–57. http://dx.doi.org/10.15407/techned2022.01.050.

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The paper is devoted to the development of a way for quantitative evaluation of the performance of an electromagnetic mill, i.e. a device that converts electrical energy into energy of mechanical interaction of operating elements (millstones) with the substance being ground/mixed. The proposed way is based on processing the results of calculating the trajectories of ferromagnetic millstones of an electromagnetic mill moving in a rotating magnetic field under the action of electrodynamic forces and hydrodynamic resistance forces and limited by the space of the working chamber. The average value

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Irani, Mazda, and Ian Gates. "On the Stability of the Edge of a Steam-Assisted-Gravity-Drainage Steam Chamber." SPE Journal 19, no. 02 (2013): 280–88. http://dx.doi.org/10.2118/167260-pa.

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Summary Steam-assisted gravity drainage (SAGD) is a successful thermal-recovery technique applied in oil-sand reservoirs in which the viscosity of the oil (bitumen) is typically in the hundreds of thousands to millions of centipoise. For the in-situ production from bitumen reservoirs, bitumen viscosity must be reduced to achieve the mobility required to flow toward the production well. Many factors influence the efficiency and rate at which bitumen is mobilized. The controlling feature of steam-based recovery processes is heat transfer from the steam chamber to the formation—the greater the he

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Ervin, Matthew H. "A Simple Low-Vacuum Environmental Cell." Microscopy and Microanalysis 9, no. 1 (2003): 18–28. http://dx.doi.org/10.1017/s1431927603030022.

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The environmental cell device discussed in this paper provides a modest low-vacuum scanning electron microscopy (SEM) capability to a standard SEM without requiring additional pumping. This environmental cell confines a volume of low vacuum in contact with the sample surface using a container that has an aperture for admitting the primary electron beam. The aperture is large enough to permit a limited field of view of the sample, and small enough to limit the outflow of gas into the SEM chamber to that which can be accommodated by the standard SEM pumping system. This environmental cell also f

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Dogan, Üzeyir, Ferah Sucularlı, Ender Yildirim, et al. "Escherichia coli Enumeration in a Capillary-Driven Microfluidic Chip with SERS." Biosensors 12, no. 9 (2022): 765. http://dx.doi.org/10.3390/bios12090765.

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Pathogen detection is still a challenging issue for public health, especially in food products. A selective preconcentration step is also necessary if the target pathogen concentration is very low or if the sample volume is limited in the analysis. Plate counting (24–48 h) methods should be replaced by novel biosensor systems as an alternative reliable pathogen detection technique. The usage of a capillary-driven microfluidic chip is an alternative method for pathogen detection, with the combination of surface-enhanced Raman scattering (SERS) measurements. Here, we constructed microchambers wi

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Lee, Jungwoo, Nathaniel Kohl, Sachin Shanbhang, and Biju Parekkadan. "Scaffold-integrated microchips for end-to-end in vitro tumor cell attachment and xenograft formation." TECHNOLOGY 03, no. 04 (2015): 179–88. http://dx.doi.org/10.1142/s2339547815500065.

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Microfluidic technologies have substantially advanced cancer research by enabling the isolation of rare circulating tumor cells (CTCs) for diagnostic and prognostic purposes. The characterization of isolated CTCs has been limited due to the difficulty in recovering and growing isolated cells with high fidelity. Here, we present a strategy that uses a 3D scaffold, integrated into a microfludic device, as a transferable substrate that can be readily isolated after device operation for serial use in vivo as a transplanted tissue bed. Hydrogel scaffolds were incorporated into a PDMS fluidic chambe

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Szafarczyk, Anna, and Rafał Gawałkiewicz. "Defining the Cubature Changes of Historic St. Kinga Chamber in Bochnia Salt Mine, Using Laser Scanning Technology." E3S Web of Conferences 35 (2018): 04006. http://dx.doi.org/10.1051/e3sconf/20183504006.

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In Poland, there are many mining enterprises, of historic character registered in the UNESCO World Heritage List. One of the oldest mining enterprises in Poland is the Salt Mine in Bochnia. The processes inside the rock mass require that surveying services carry out regular geometric control of the cavities. A particular attention should be paid (due to its sacral function) on St. Kinga Chamber, located 195 metres below the surface, on the mine level “August”. So far measurement technologies have been connected with the studies on changes in the geometry of cavities and based on linear bases u

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Lopez de la Fuente, Carmen, Ana Sanchez-Cano, Francisco Segura, Lorena Fuentes-Broto, and Isabel Pinilla. "Repeatability of Ocular Measurements with a Dual-Scheimpflug Analyzer in Healthy Eyes." BioMed Research International 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/808646.

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Purpose. To assess the repeatability of the Galilei dual Scheimpflug analyzer (GDSA) in anterior segment examination.Methods. Fifty-two eyes from 52 healthy volunteers were prospectively and consecutively recruited. Anatomic, axial, refractive, and instantaneous parameters were measured with GDSA to provide a complete characterization of the anterior segment. Repeatability was assessed calculating intraclass correlation coefficient (ICC), and coefficient of variation (COV).Results. Correlation among repeated measurements showed almost perfect reliability (ICC > 0.81) for all parameters exce

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Miklishanskaya, S. V., N. A. Mazur, A. V. Chapurnykh, M. A. Saidova, O. Ya Narusov, and S. A. Orlovsky. "Contribution of epicardial adipose tissue to atrial fibrillation development in patients with arterial hypertension: a pilot study." Russian Journal of Cardiology 29, no. 5 (2024): 5659. http://dx.doi.org/10.15829/1560-4071-2024-5659.

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Aim. To evaluate the value of body mass index (BMI), visceral adipose tissue (VAT) and epicardial adipose tissue (EAT) depots in the development of atrial fibrillation (AF).Material and methods. The study included 24 people with isolated hypertension (HTN) and 28 people with HTN in combination with AF. The median age of patients was 61,5 [53,8;69,0] years. The observational study assessed height, weight, BMI, proportion of VAT, EAT thickness, and cardiac chamber sizes. Height was measured using a metal height meter Rm-1 "Diakoms"; the results were expressed in centimeters. Weight, BMI, and VAT

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Halon, David A., Jubran Ayman, Ronen Rubinshtein, Barak Zafrir, Mali Azencot, and Basil S. Lewis. "Cardiac Computed Tomography Angiographic Findings as Predictors of Late Heart Failure in an Asymptomatic Diabetic Cohort: An 8-Year Prospective Follow-Up Study." Cardiology 138, no. 4 (2017): 218–27. http://dx.doi.org/10.1159/000478995.

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Objectives: Predictive models for heart failure (HF) in heterogeneous populations have had limited success. We examined cardiac computed tomography angiography (CTA) predictors of HF or cardiovascular death (HF-CVD) in a prospective study of asymptomatic diabetics undergoing baseline assessment by CTA. Methods: The subjects (n = 735, aged 55-74 years, 51.2% women) had no clinical history of cardiovascular disease at study entry. Coronary artery calcium (CAC) score, CTA-defined coronary atherosclerosis, cardiac chamber volumes, and clinical data were collected and late outcome events recorded o

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Chang, Zhiying, and Tinglin Huang. "Analysis of Water-Lifting Aerator Performance Based on the Volume of Fluid Method." Water 15, no. 5 (2023): 991. http://dx.doi.org/10.3390/w15050991.

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Water quality deterioration is a major problem faced by reservoirs globally, owing to the inflow of pollution from industrial and municipal activities. Water-lifting aeration is an in situ water quality improvement technology that mixes and oxygenates deep water bodies in reservoirs to improve pollution control efficiency and water quality. While previous studies have mainly focused on the mixing process in the reservoir outside the water-lifting aerator (WLA), knowledge of the internal flow remains limited. In this study, a two-phase flow within a WLA system was numerically studied using the

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Chen, Siying, Yuanyuan Chen, Yinchao Zhang, Pan Guo, He Chen, and Huiyun Wu. "The 3D Modeling System for Bioaerosol Distribution Based on Planar Laser-Induced Fluorescence." Sensors 21, no. 8 (2021): 2607. http://dx.doi.org/10.3390/s21082607.

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Although it is quite challenging to image and analyze the spatial distribution of bioaerosols in a confined space, a three-dimensional (3D) modeling system based on the planar laser-induced fluorescence (PLIF) technique is proposed in this paper, which is designed to analyze the temporal and spatial variations of bioaerosol particles in a confined chamber. The system employs a continuous planar laser source to excite the fluoresce, and a scientific complementary metal oxide semiconductor (sCMOS) camera to capture images of 2048 × 2048 pixels at a frame rate of 12 Hz. While a sliding platform i

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Reale, Fabrizio. "Effects of Steam Injection on the Permissible Hydrogen Content and Gaseous Emissions in a Micro Gas Turbine Supplied by a Mixture of CH4 and H2: A CFD Analysis." Energies 15, no. 8 (2022): 2914. http://dx.doi.org/10.3390/en15082914.

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The use of hydrogen in small scale gas turbines is currently limited by several issues. Blending hydrogen with methane or other gaseous fuels can be considered a low medium-term viable solution, with the goal of reducing greenhouse gas emissions. In fact, only small amounts can be mixed with methane in premixed combustors, due to the risk of flashback. The aim of this article is to investigate the injection of small quantities of steam as a method of increasing the maximum permissible hydrogen content in a mixture with methane. The proposed approach involves introducing the steam directly into

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Li, Xiaoran, Weifeng Wu, Jing Zhang, Chengqiang Guo, Feng Ke, and Fuqiang Jiang. "Analysis of 3D Transient Flow in a High-Speed Scroll Refrigeration Compressor." Energies 16, no. 7 (2023): 3089. http://dx.doi.org/10.3390/en16073089.

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In mobile devices such as aircraft and electric vehicles, due to limited space, there are strict requirements on the volume and weight of the compressor mounted on the vehicle. Therefore, high-speed scroll compressors have attracted more and more attention because of their small size and light weight. In this paper, the numerical calculations and analysis of the three-dimensional (3D) transient flows in a high-speed scroll refrigeration compressor were established and validated. Circumferential gas intake was used in the simulation. According to the actual compressor size, the mesh generation

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Chemaly, Elie R., Antoine H. Chaanine, Susumu Sakata, and Roger J. Hajjar. "Stroke volume-to-wall stress ratio as a load-adjusted and stiffness-adjusted indicator of ventricular systolic performance in chronic loading." Journal of Applied Physiology 113, no. 8 (2012): 1267–84. http://dx.doi.org/10.1152/japplphysiol.00785.2012.

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Load-adjusted measures of left ventricle (LV) systolic performance are limited by dependence on LV stiffness and afterload. To our knowledge, no stiffness-adjusted and afterload-adjusted indicator was tested in models of pressure (POH) and volume overload hypertrophy (VOH). We hypothesized that wall stress reflects changes in loading, incorporating chamber stiffness and afterload; therefore, stroke volume-to-wall stress ratio more accurately reflects systolic performance. We used rat models of POH (ascending aortic banding) and VOH (aorto-cava shunt). Animals underwent echocardiography and pre

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Yamin, Iqbal, Bambang Sugiarto, Setia Abikusna, and Dedi Suntoro. "The use of low grade bio ethanol as fuel mixer in gasoline engine with optimization compact distillator." E3S Web of Conferences 67 (2018): 02004. http://dx.doi.org/10.1051/e3sconf/20186702004.

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Limited fossil energy resources need to encourage renewable energy development and energy conservation it is called green energy development. One of the alternative energy sources used are bioethanol, from low grade is converted into high grade through distillation process with distillator compact that will be used as a mixture of gasoline. Tests compact distillator consisting of evaporator Indonesia Kampus, separator, and condenser by utilizing exhaust gas to heat distillator already filled with low grade bioethanol, so the heat transfer occurs on the surface of the exhaust into the evaporato

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