Article
Green & Sustainable Science & Technology
Lei Lei, Jiahua Zheng, Shaoyu Li, Lishan Yang, Wenqiong Wang, Feng Zhang, Bin Zhang
Summary: Soil hydrological properties are crucial for maintaining ecosystem functions. This study investigated the effects of different grazing intensities on soil hydrological properties in a desert steppe in Inner Mongolia. The results showed that overgrazing had detrimental effects on soil moisture content and nutrient content, while light grazing was found to be optimal for maintaining good hydrological properties.
Article
Engineering, Chemical
Bhaumik Sutariya, Santanu Karan
Summary: This article discusses the importance of high flux nanofiltration (NF) membranes and mathematical models for pore size estimation. It provides a detailed discussion on the probability density function (PDF) model and addresses its flaws and the need for standardization.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Geological
Wei Yan, Roberto Cudmani
Summary: The pore structure of soils and rocks is crucial in geotechnical and geological engineering. In this study, a general multimodal pore size distribution (PSD) model based on probability theory is developed and validated by reproducing PSD curves of different samples. The model is also applied to predict the pore structure evolution under hydro-mechanical processes and time-dependent changes.
ENGINEERING GEOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
He Chen, Shi-Jin Feng
Summary: This study develops a simple water retention model for dual-porosity soils that considers the self-similar characteristics of the pore size distribution (PSD) between macropore and micropore regions. The model simulates the macropore PSD using the differential VG model, which is then shifted and scaled to capture the micropore PSD. The results show that the proposed model can accurately predict the water retention behavior and hydraulic conductivity of dual-porosity soils.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Environmental Sciences
Zhichao Wang, Wenlu Li, Weiping Li, Wenhuan Yang, Shuangyi Jing
Summary: Microplastic pollution in the soil has detrimental effects on soil structure and water-holding capacity, impacting the soil water characteristic curve (SWCC). This study investigated the influence of different concentrations and sizes of polyethylene microplastics (PE-MPs) on SWCCs in sandy and loamy soils. Results showed that low concentrations of PE-MPs had minimal effects on soil water content, while high concentrations significantly affected water-holding properties, with smaller MPs enhancing water retention in loamy soil and larger MPs reducing water content in sandy soil.
Article
Geosciences, Multidisciplinary
Yavuz Selim Guclu
Summary: The study introduces a new type of Burr distribution as an alternative method for probability calculation, which can better fit the actual data. By analyzing rainfall data from three stations in Turkey, the results indicate that the new Burr distribution outperforms the traditional Log-Normal and Gamma distributions in estimating probability features.
SPATIAL STATISTICS
(2021)
Article
Engineering, Civil
Xiangrong Wang, Hui Wang, Fujian Tang, Homero Castaneda, Robert Liang
Summary: The study presents a novel modelling and predicting approach for analyzing the spatial distribution of pipeline external corrosion defects using the MVPLN model. The model accounts for over-dispersion and unobserved heterogeneity of defect count data, as well as considers stochastic correlation between defects with different spatial patterns. Validation through cross-validation shows superior results compared to commonly used univariate count data models.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2021)
Article
Mathematics, Applied
Ezequiel del Rio, Sergio Elaskar
Summary: Chaotic intermittency is a route to chaos involving transitions between laminar and chaotic dynamics. The reinjection mechanism, described by the reinjection probability density (RPD), usually assumed to be constant, has been observed to be non-uniform in a wide class of 1D maps leading to a generalization of the intermittency theory. As a result, characteristic relations associated with different types of intermittency are not well-defined and cannot be determined experimentally.
Article
Engineering, Civil
Fuhai Sun, Bo Xiao, Shenglong Li, Xingxing Yu, Giora J. Kidron, Joshua Heitman
Summary: Biocrusts, as important living skin in soil-atmosphere interface, have a significant impact on soil properties and processes, especially pore structure and hydrological processes. This study used X-ray computed tomography and image analysis to quantitatively analyze the differences in pore structure between bare soil and three types of biocrusts. The results showed that biocrusts had higher porosity, pore surface area density, pore volume, and node density compared to bare soil, indicating a more complex and stable pore structure. Furthermore, biocrusts had a better pore network connectivity and improved soil water holding capacity but decreased saturated hydraulic conductivity, which affects surface hydrological processes in drylands.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Geological
Alfrendo Satyanaga, Harianto Rahardjo, Qian Zhai, Sung-Woo Moon, Jong Kim
Summary: The soil-water characteristic curve (SWCC) is a fundamental soil attribute in unsaturated soil mechanics. However, traditional laboratory methods for determining SWCC are expensive, time-consuming, and challenging. This study proposes a modified lognormal distribution function to generate SWCC prediction models for various soil types, with parameters that have well-defined physical meanings.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
Article
Neurosciences
Aitor Morales-Gregorio, Alexander van Meegen, Sacha J. van Albada
Summary: Numbers of neurons and their spatial variation are fundamental organizational features of the brain. A new study reveals that neuron densities in the brain follow a lognormal distribution both within and across cortical areas in multiple mammalian species. This finding suggests a universal organizational principle of cortical cytoarchitecture and adds to the list of lognormal variables in the brain.
Article
Thermodynamics
Jefferson Raja Bose, Stephen Manova, Lazarus Godson Asirvatham, Somchai Wongwises
Summary: The article summarizes recent research on enhancing heat transfer and improving effective thermal conductivity using micro pore metal foams, while also discussing the effects of porosity and pore density on heat transfer enhancement.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Environmental Sciences
Jalal David Jabro, William Bart Stevens
Summary: Tillage practices have a significant effect on the pore size distribution of the soil, especially in the macro-pore and meso-pore size classes. Conventional tillage results in greater soil loosening and a higher proportion of large pores.
Article
Construction & Building Technology
Pengfei Bian, Meng Zhang, Qijun Yu, Binggen Zhan, Peng Gao, Binglin Guo, Yuyang Chen
Summary: This study investigates the relationship between pores and compressive strength of foamed concrete. The results show that changes in density and water-cement ratio affect porosity and pore size distribution, with lower densities and higher water-cement ratios leading to more larger-sized pores and wider and more nonuniform pore size distributions. Furthermore, the pore structure of lower-density foamed concrete is more susceptible to density and water-cement ratio, resulting in larger size pores. The type of foaming agent also has a significant impact on pore size distribution. Smaller porosity and more concentrated and uniform pore size distribution are found to be beneficial for strength. A new empirical model is proposed to relate porosity, size distribution, and compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Soil Science
Renato P. de Lima, Mario M. Rolim, Matheus P. S. Toledo, Cassio A. Tormena, Anderson R. da Silva, Ivis Andrei C. e Silva, Elvira M. R. Pedrosa
Summary: The study examined the impact of soil texture and degree of compactness on total porosity and distribution of macro-, meso- and micropores. It found that total porosity and macroporosity are dependent on compactness and silt plus clay content, while meso- and micropores are mainly affected by particle size distribution. The findings suggest that increasing compactness may reduce total porosity and macroporosity, with meso- and micropores being more sensitive to changes in particle size distribution.
SOIL & TILLAGE RESEARCH
(2022)