Phase state and velocity measurements with high temporal and spatial resolution during melting of n-octadecane in a rectangular enclosure with two heated vertical sides

AbstractA machine learning approach was employed to detect and quantify Microcystis colonial morphospecies using FlowCAM-based imaging flow cytometry. The system was trained and tested using samples from a long-term mesocosm experiment (LMWE, Central Jutland, Denmark). The statistical validation of the classification approaches was performed using Hellinger distances, Bray–Curtis dissimilarity, and Kullback–Leibler divergence. The semi-automatic classification based on well-balanced training sets from Microcystis seasonal bloom provided a high level of intergeneric accuracy (96–100%) but relatively low intrageneric accuracy (67–78%). Our results provide a proof-of-concept of how machine learning approaches can be applied to analyze the colonial microalgae. This approach allowed to evaluate Microcystis seasonal bloom in individual mesocosms with high level of temporal and spatial resolution. The observation that some Microcystis morphotypes completely disappeared and re-appeared along the mesocosm experiment timeline supports the hypothesis of the main transition pathways of colonial Microcystis morphoforms. We demonstrated that significant changes in the training sets with colonial images required for accurate classification of Microcystis spp. from time points differed by only two weeks due to Microcystis high phenotypic heterogeneity during the bloom. We conclude that automatic methods not only allow a performance level of human taxonomist, and thus be a valuable time-saving tool in the routine-like identification of colonial phytoplankton taxa, but also can be applied to increase temporal and spatial resolution of the study.

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Potential of Arabic documentary sources for reconstructing past climate in the western Mediterranean region from AD 680 to 1815

The Holocene ◽

10.1177/09596836211033202 ◽

2021 ◽

pp. 095968362110332

Author(s):

Yassin Meklach ◽

Chantal Camenisch ◽

Abderrahmane Merzouki ◽

Ricardo Garcia Herrera

Keyword(s):

Spatial Resolution ◽

Mediterranean Region ◽

Climate Extremes ◽

Western Mediterranean ◽

Historical Documents ◽

Atmospheric Conditions ◽

Documentary Sources ◽

Drought Conditions ◽

Temporal And Spatial ◽

Climate Proxies

Archival records and historical documents offer direct observation of weather and atmospheric conditions and have the highest temporal and spatial resolution, and precise dating, of the available climate proxies. They also provide information about variables such as temperature, precipitation and climate extremes, as well as floods, droughts and storms. The present work studied Arab-Islamic documentary sources covering the western Mediterranean region (documents written by Arab-Islamic historians that narrate social, political and religious history) available for the period AD 680–1815. They mostly provide information on hydrometeorological events. In Iberia the most intense droughts were reported during AD 747–753, AD 814–822, AD 846–847, AD 867–874 and AD 914–915 and in the Maghreb AD 867–873, AD 898–915, AD 1104–1147, AD 1280–1340 and AD 1720–1815 had prevalent drought conditions. Intense rain episodes are also reported.

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Analyzing Traffic Density in Images with Low Temporal and Spatial Resolution

Proceedings of the 29th International Conference on Image and Vision Computing New Zealand - IVCNZ '14 ◽

10.1145/2683405.2683412 ◽

2014 ◽

Cited By ~ 1

Author(s):

Michael Claveria ◽

Kyungim Baek

Keyword(s):

Spatial Resolution ◽

Traffic Density ◽

Temporal And Spatial

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Heat Transfer Characteristics of the Phase Change Material Microcapsule Slurry in Solid Phase State

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.1187 ◽

2011 ◽

Vol 71-78 ◽

pp. 1187-1190

Author(s):

Yan Lai Zhang ◽

Zhong Hao Rao ◽

Shuang Feng Wang ◽

Hong Zhang ◽

Li Jun Li ◽

...

Keyword(s):

Heat Transfer ◽

Nusselt Number ◽

Rayleigh Number ◽

Aspect Ratio ◽

Phase State ◽

Solid Phase ◽

Heat Transfer Characteristics ◽

Rectangular Enclosure ◽

Transfer Characteristics ◽

Change Material

This experiment is performed to investigate heat transfer characteristics with the PCM microcapsule slurry in a solid phase state at a horizontal rectangular enclosure heating from below and cooling from top. Some important parameters are taken into account such as the mass concentration of the PCM, the temperature difference between heating plate and cooling plate, Nusselt number Nu, Rayleigh number Ra and the aspect ratio (width/height) of the horizontal rectangular enclosure. Experiment is done under the thermal steady condition in the PCM microcapsule slurry. Heat transfer coefficient is measured under various temperature differences in PCM mass concentrations of 10% and 20%. And relationship with Nusselt number Nu and Rayleigh number Ra is summarized to various heights H or the aspect ratio (width/height) Ar of enclosure.

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Electroluminescence measurements with temporal and spatial resolution for CMOS latch-up investigations

Microelectronic Engineering ◽

10.1016/0167-9317(90)90028-r ◽

1990 ◽

Vol 12 (1-4) ◽

pp. 157-162 ◽

Cited By ~ 5

Author(s):

J. Quincke ◽

C. Boit ◽

D. Führer

Keyword(s):

Spatial Resolution ◽

Temporal And Spatial ◽

Latch Up

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Temporal and Spatial Resolution Requirements for Regional-Scale Dispersion Models

Air Pollution Modeling and Its Application VIII ◽

10.1007/978-1-4615-3720-5_38 ◽

1991 ◽

pp. 427-437 ◽

Cited By ~ 2

Author(s):

Michael D. Moran ◽

Roger A. Pielke ◽

Richard T. McNider

Keyword(s):

Spatial Resolution ◽

Regional Scale ◽

Dispersion Models ◽

Temporal And Spatial ◽

Resolution Requirements

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Experimental Estimation of Temporal and Spatial Resolution of Coefficient of Heat Transfer in a Channel Using Inverse Heat Transfer Method

10.20944/preprints201907.0264.v1 ◽

2019 ◽

Author(s):

Majid Karami ◽

Somayeh Davoodabadi Farahani ◽

Farshad Kowsary ◽

Amir Mosavi

Keyword(s):

Heat Transfer ◽

Nusselt Number ◽

Heat Transfer Coefficient ◽

Transfer Coefficient ◽

Spatial Resolution ◽

Time History ◽

Inverse Technique ◽

Inverse Heat Transfer ◽

Temporal And Spatial ◽

Transfer Method

In this research, a novel method to investigation the transient heat transfer coefficient in a channel is suggested experimentally, in which the water flow, itself, is considered both just liquid phase and liquid-vapor phase. The experiments were designed to predict the temporal and spatial resolution of Nusselt number. The inverse technique method is non-intrusive, in which time history of temperature is measured, using some thermocouples within the wall to provide input data for the inverse algorithm. The conjugate gradient method is used mostly as an inverse method. The temporal and spatial changes of heat flux, Nusselt number, vapor quality, convection number, and boiling number have all been estimated, showing that the estimated local Nusselt numbers of flow for without and with phase change are close to those predicted from the correlations of Churchill and Ozoe (1973) and Kandlikar (1990), respectively. This study suggests that the extended inverse technique can be successfully utilized to calculate the local time-dependent heat transfer coefficient of boiling flow.

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Assessing the reproducibility of high temporal and spatial resolution dynamic contrast-enhanced magnetic resonance imaging in patients with gliomas

Scientific Reports ◽

10.1038/s41598-021-02450-5 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Woo Hyeon Lim ◽

Joon Sik Park ◽

Jaeseok Park ◽

Seung Hong Choi

Keyword(s):

Spatial Resolution ◽

Intraclass Correlation ◽

Correlation Coefficients ◽

Voxel Size ◽

Dce Mri ◽

Intraclass Correlation Coefficients ◽

Dynamic Contrast Enhanced ◽

Contrast Enhanced ◽

Temporal And Spatial ◽

Arterial Input Functions

AbstractTemporal and spatial resolution of dynamic contrast-enhanced MR imaging (DCE-MRI) is critical to reproducibility, and the reproducibility of high-resolution (HR) DCE-MRI was evaluated. Thirty consecutive patients suspected to have brain tumors were prospectively enrolled with written informed consent. All patients underwent both HR-DCE (voxel size, 1.1 × 1.1 × 1.1 mm3; scan interval, 1.6 s) and conventional DCE (C-DCE; voxel size, 1.25 × 1.25 × 3.0 mm3; scan interval, 4.0 s) MRI. Regions of interests (ROIs) for enhancing lesions were segmented twice in each patient with glioblastoma (n = 7) to calculate DCE parameters (Ktrans, Vp, and Ve). Intraclass correlation coefficients (ICCs) of DCE parameters were obtained. In patients with gliomas (n = 25), arterial input functions (AIFs) and DCE parameters derived from T2 hyperintense lesions were obtained, and DCE parameters were compared according to WHO grades. ICCs of HR-DCE parameters were good to excellent (0.84–0.95), and ICCs of C-DCE parameters were moderate to excellent (0.66–0.96). Maximal signal intensity and wash-in slope of AIFs from HR-DCE MRI were significantly greater than those from C-DCE MRI (31.85 vs. 7.09 and 2.14 vs. 0.63; p < 0.001). Both 95th percentile Ktrans and Ve from HR-DCE and C-DCE MRI could differentiate grade 4 from grade 2 and 3 gliomas (p < 0.05). In conclusion, HR-DCE parameters generally showed better reproducibility than C-DCE parameters, and HR-DCE MRI provided better quality of AIFs.

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