Effects of moisture distribution on measurement of moisture content of dried corn

2006 ◽  
Vol 35 (2) ◽  
pp. 171-181
Author(s):  
B. Gillay ◽  
D. Funk
Keyword(s):  
Moisture Content ◽  
Moisture Distribution

Distribution of soil moisture content and its effect on the potential growth of the over-story species in North-East Chalkidiki

2001 ◽  
Vol 66 ◽  
Author(s):  
M. Aslanidou ◽  
P. Smiris
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Soil Depth ◽  
Moisture Distribution ◽  
Taxus Baccata ◽  
Mixed Stands ◽  
Potential Growth ◽  
North East ◽  
Soil Moisture Distribution

This  study deals with the soil moisture distribution and its effect on the  potential growth and    adaptation of the over-story species in north-east Chalkidiki. These  species are: Quercus    dalechampii Ten, Quercus  conferta Kit, Quercus  pubescens Willd, Castanea  sativa Mill, Fagus    moesiaca Maly-Domin and also Taxus baccata L. in mixed stands  with Fagus moesiaca.    Samples of soil, 1-2 kg per 20cm depth, were taken and the moisture content  of each sample    was measured in order to determine soil moisture distribution and its  contribution to the growth    of the forest species. The most important results are: i) available water  is influenced by the soil    depth. During the summer, at a soil depth of 10 cm a significant  restriction was observed. ii) the    large duration of the dry period in the deep soil layers has less adverse  effect on stands growth than in the case of the soil surface layers, due to the fact that the root system mainly spreads out    at a soil depth of 40 cm iii) in the beginning of the growing season, the  soil moisture content is    greater than 30 % at a soil depth of 60 cm, in beech and mixed beech-yew  stands, is 10-15 % in    the Q. pubescens  stands and it's more than 30 % at a soil depth of 60 cm in Q. dalechampii    stands.

scholarly journals Effect of Radial Moisture Distribution on Frequency Domain Dielectric Response of Oil-Polymer Insulation Bushing

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1219 ◽  
Author(s):  
Daning Zhang ◽  
Guanwei Long ◽  
Yang Li ◽  
Haibao Mu ◽  
Guanjun Zhang
Keyword(s):  
Moisture Content ◽  
Space Charge ◽  
Frequency Domain ◽  
Water Distribution ◽  
Space Charge Polarization ◽  
Moisture Distribution ◽  
Mechanism Analysis ◽  
Loss Peak ◽  
Charge Polarization ◽  
Peak Value

In order to realize the diagnosis of water distribution, this paper analyzes the interface polarization and macroscopic space charge polarization mechanism when the water distribution is non-uniform. The experimental results of this paper and bushing show that when the moisture distribution is non-uniform, there is a significant loss peak in the tanδ-f curve. The loss peak shifts to higher frequencies as the non-uniformity coefficient increases. There are common intersection points between multiple tanδ-f curves. Further, this paper realizes the diagnosis of the location of moisture distribution through Frequency Domain Spectroscopy (FDS) testing of different voltages and different wiring methods based on the macroscopic space charge polarization. In the single-cycle FDS test, when the positive electrode is first added to the area with higher moisture content, the amplitude of the tanδ-f curve is smaller. The tanδ-f curves under different wiring methods constitute a “ring-shaped” loss peak. As the voltage increases, the peak value of the loss peak shifts to the lower frequency band. As the temperature increases, the peak value of the loss peak shifts to higher frequencies. Based on the above rules and mechanism analysis, this research provides a new solution for the evaluation of moisture content of oil-immersed polymers equipment.

scholarly journals RF signal calibration for improvement of 3D mapping image to locate moisture distribution in rice silo

2021 ◽  
Vol 2107 (1) ◽  
pp. 012059
Author(s):  
A A Almaleeh ◽  
A Zakaria ◽  
M H F Rahiman ◽  
Y B Abdul Rahim ◽  
L Munirah ◽  
...  
Keyword(s):  
Moisture Content ◽  
Real Time ◽  
Current Method ◽  
Moisture Distribution ◽  
Rice Grain ◽  
Tomographic Images ◽  
Grain Moisture ◽  
A New Technique ◽  
Assurance Process ◽  
Rf Signal

Abstract Grain storage is an important part of the post-harvest quality assurance process. The moisture level of the grains during storage is one of the primary problems. The current method of measuring rice grain moisture content is based on random sampling, which is relatively localised, and there is no real-time moisture content measurement available. The RF signal was used to build a new technique for detecting moisture and its presence in rice in real-time in this paper. The mapping of an RF signal, in particular, can be transformed into volumetric tomographic images that can be used to forecast moisture distribution.

scholarly journals Within-ring movement of free water in dehydrating Norway spruce sapwood visualized by neutron radiography

Holzforschung ◽  
2012 ◽  
Vol 66 (6) ◽  
pp. 751-756 ◽  
Author(s):  
Sabine Rosner ◽  
Martin Riegler ◽  
Peter Vontobel ◽  
David Mannes ◽  
Eberhard H. Lehmann ◽  
...  
Keyword(s):  
Moisture Content ◽  
Norway Spruce ◽  
Neutron Radiography ◽  
Free Water ◽  
Neutron Imaging ◽  
Moisture Distribution ◽  
Moisture Loss ◽  
Annual Rings ◽  
Ambient Conditions ◽  
Dimensional Changes

Abstract This study is a first approach to visualize moisture distribution and movement between annual rings during sapwood drying by neutron imaging (NI). While Norway spruce [Picea abies (L.) Karst.] sapwood beams were allowed to dehydrate on a balance at ambient conditions, NI was performed in 1–10 min time steps. From NI raw files, radial dimensional changes were calculated during dehydration and transmission profiles were drawn for different relative moisture content (MC) steps from full saturation until equilibrium moisture content. The NI technique proved to be a useful tool to visualize the movement of free water within, and between, annual rings. Removal of free water in the middle part of the wood beam did not proceed continuously from the surface to the central part, but was strongly influenced by wood anatomy. Water is removed from earlywood during early stages of dehydration and later, at higher moisture loss (<50% MC), from the main latewood parts. It is therefore concluded that the radial dimensional changes measured at moderate moisture loss are not only caused by cell wall shrinkage of the outer wood parts located beneath the wood surface, but a result of elastic deformation of earlywood tracheids under the influence of negative hydrostatic pressures.

Soil moisture distribution mapping in topsoil and its effect on maize yield

Biologia ◽  
2017 ◽  
Vol 72 (8) ◽  
Author(s):  
Gábor Milics ◽  
Attila J. Kovács ◽  
Attila Pörneczi ◽  
Anikó Nyéki ◽  
Zoltán Varga ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Management Practices ◽  
Soil Moisture Content ◽  
Cost Effective ◽  
Maize Yield ◽  
Moisture Distribution ◽  
Field Soil ◽  
Spatial Coverage ◽  
Distribution Mapping

AbstractSoil moisture content directly influences yield. Mapping within field soil moisture content differences provides information for agricultural management practices.In this study we aimed to find a cost-effective method for mapping within field soil moisture content differences. Spatial coverage of the field sampling or TDR method is still not dense enough for site-specific soil management. Soil moisture content can be calculated by measuring the apparent soil electrical conductivity (Soil moisture map was also compared to yield map showing correlation (

scholarly journals Quantitative prediction of moisture content distribution in acetylated wood using near-infrared hyperspectral imaging

2022 ◽  
Author(s):  
Muhammad Awais ◽  
Michael Altgen ◽  
Mikko Mäkelä ◽  
Tiina Belt ◽  
Lauri Rautkari
Keyword(s):  
Moisture Content ◽  
Hyperspectral Imaging ◽  
Near Infrared ◽  
Infrared Image ◽  
Moisture Distribution ◽  
Quantitative Prediction ◽  
Chemical Information ◽  
Least Squares Regression ◽  
Dynamic Vapor Sorption ◽  
Wood Surfaces

AbstractThe uptake of moisture severely affects the properties of wood in service applications. Even local moisture content variations may be critical, but such variations are typically not detected by traditional methods to quantify the moisture content of the wood. In this study, we used near-infrared hyperspectral imaging to predict the moisture distribution on wood surfaces at the macroscale. A broad range of wood moisture contents were generated by controlling the acetylation degree of wood and the relative humidity during sample conditioning. Near-infrared image spectra were then measured from the surfaces of the conditioned wood samples, and a principal component analysis was applied to separate the useful chemical information from the spectral data. Moreover, a partial least squares regression model was developed to predict moisture content on the wood surfaces. The results show that hyperspectral near-infrared image regression can accurately predict the variations in moisture content across wood surfaces. In addition to sample-to-sample variation in moisture content, our results also revealed differences in the moisture content between earlywood and latewood in acetylated wood. This was in line with our recent studies where we found that thin-walled earlywood cells are acetylated faster than the thicker latewood cells, which decreases the moisture uptake during the conditioning. Dynamic vapor sorption isotherms validated the differences in moisture content within earlywood and latewood cells. Overall, our results demonstrate the capabilities of hyperspectral imaging for process analytics in the modern wood industry. Graphical abstract

scholarly journals A Model of Moist Polymer Foam and a Scheme for the Calculation of Its Thermal Conductivity

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 520 ◽  
Author(s):  
Vadzim I. Nikitsin ◽  
Abdrahman Alsabry ◽  
Valery A. Kofanov ◽  
Beata Backiel-Brzozowska ◽  
Paweł Truszkiewicz
Keyword(s):  
Thermal Conductivity ◽  
Binary System ◽  
Moisture Content ◽  
Pore Space ◽  
Moisture Distribution ◽  
Gas Mixture ◽  
Diffusion Resistance ◽  
Polymer Foam ◽  
Vapor Diffusion ◽  
Diffusion Transfer

This paper proposes a method for determining an effective value of the thermal conductivity for moist, highly porous rigid polymer foams. The model of moist foam based on an ordered structure with interpenetrating components was developed in accordance with the moisture distribution in the pore space. With small moisture content, isolated water inclusions are formed, and the pore space is considered as a binary system (vapor-gas mixture and water) with isolated inclusions. With an increase in moisture content, isolated water inclusions merge, forming a continuous layer, and pore space is considered as a binary system of interpenetrating components. The thermal conductivity of the vapor-gas mixture is represented as the sum of the thermal conductivity of the dry gas and the thermal conductivity of the vapor caused by the diffusion transfer of vapor in the pore space, taking into account the coefficient of vapor diffusion resistance. Using the proposed scheme of calculation, a computational experiment was performed to establish the influence of the vapor diffusion, moisture content, and average temperature of the foam on its thermal conductivity.

Research on Monitoring of Moisture Content in Transformer Oil by Using Sensors

2013 ◽  
Vol 684 ◽  
pp. 486-490 ◽  
Author(s):  
Qiang Fu ◽  
Meng Jun Wang ◽  
Wei Su ◽  
Yi Hua Qian ◽  
Guo Hua Lu
Keyword(s):  
Moisture Content ◽  
Temperature Sensor ◽  
Humidity Sensor ◽  
Transformer Oil ◽  
Moisture Distribution ◽  
Characteristic Parameters ◽  
On Line ◽  
Variation Mechanism ◽  
Capacitive Humidity Sensor

The moisture distribution in the transformer and variation mechanism of moisture in oil is analyzed in this paper, and using relative saturation and temperature as characteristic parameters, a detail scheme of on-line monitoring moisture content in transformer oil is put forward. The polyimide-based capacitive humidity sensor and temperature sensor are employed in on-line monitoring moisture content in oil. Computer is utilized to sample and analyze the data that sensors send out. The experiment on test transformer confirms that the sensors can work reliably, and reflect the moisture content in transformer oil accurately. The method that the paper proposes can realize the purpose of on-line monitoring.

Mathematical modeling of drying of Masson pine lumber and its asymmetrical moisture content profile

Holzforschung ◽  
2014 ◽  
Vol 68 (3) ◽  
pp. 313-321 ◽  
Author(s):  
Jie Zhang ◽  
Ping Miao ◽  
Di Zhong ◽  
Lin Liu
Keyword(s):  
Moisture Content ◽  
Moisture Transfer ◽  
Free Water ◽  
Dirichlet Boundary Conditions ◽  
Moisture Distribution ◽  
Parabolic Partial Differential Equation ◽  
Vapor Permeability ◽  
Drying Process ◽  
Permeability Model ◽  
Masson Pine

Abstract A mathematical model is discussed in terms of moisture transfer during the drying process of Masson pine (Pinus massoniana) lumber in industrial practice. The model was validated by comparing the simulated result of moisture distribution with experimental data. In the model, the wood drying process was divided into two phases. The first one dealt with processes above fiber saturation point (FSP), that was driven by capillary flux of free water and conductive flux of vapor, and the second one dealt with those of below FSP, which was driven by diffusive flux of bound water and vapor. Moisture content distribution (MCD) inside wood is simulated by solving a parabolic partial differential equation under Dirichlet boundary conditions. The moisture content profile (MCP) was asymmetrical in experiments, and the simulation result agreed well with the experiments. An easy empirical formulation was also proposed to calculate real wood permeability, as it showed general characteristics of liquid and vapor permeability. This permeability model is verified as the cause of asymmetrical MCP in this paper.

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