Article
Environmental Sciences
Yang Song, Rui Hu, Quan Liu, Huiyang Qiu, Xiaolan Hou, Junjie Qi, Bernard Konadu-Amoah
Summary: This study aimed to evaluate the utility of multiple inversion techniques on aquifer heterogeneity characterization. A series of warm water injection tests were simulated in a fluvial aquifer analogue outcrop, and the calculated head and temperature datasets were used with the four above-mentioned inversion methods to reveal the aquifer heterogeneity. The results showed that thermal tracer tomography, hydraulic travel time, and attenuation tomography accurately characterized the high permeability zones within the well area, while the geological statistical method depicted the overall distribution of K values for a larger area. By comparing and combining the individual inversion results, the scientific and economic complementarity can be studied, and valuable advice for the choice of different inversion methods can be recommended for future practices.
Article
Construction & Building Technology
Xintong Wang, Zhenhao Xu, Jie Hu
Summary: This study investigates the use of hydraulic tomography (HT) in detecting water-bearing structures for preventing groundwater hazards in tunnels. The results show that sufficient pumping and observation wells can capture water-bearing structures and hydraulic properties. Transient hydraulic tomography (THT) inversion is more effective than steady-state hydraulic tomography (SSHT) inversion. Inverted hydraulic conductivity and specific storage fields are correlated with observed heads at different stages of the pumping test. Geological information can greatly assist in mapping potential water-bearing structures.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Environmental Sciences
Xiaolan Hou, Rui Hu, Tian-Chyi Jim Yeh, Yukun Li, Junjie Qi, Yang Song, Huiyang Qiu
Summary: In this study, the random finite element method was used to investigate the cross correlations between observed head and hydraulic conductivity and specific storage in pumping tests. The results showed that the maximal cross correlations occurred before pumping reached steady state. A short-term pumping strategy using the successive linear estimator was proposed based on the cross-correlation analysis. Monte Carlo simulations were conducted to validate the strategy.
WATER RESOURCES RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Philipp M. Pelz, Catherine Groschner, Alexandra Bruefach, Adam Satariano, Colin Ophus, Mary C. Scott
Summary: The shape-controlled synthesis of multiply twinned nanostructures is crucial in nanoscience. This study investigates the prevalence of transient structures during the growth of multiply twinned particles and employs atomic electron tomography to reveal the atomic-scale three-dimensional structure of a Pd nanoparticle undergoing a shape transition.
Article
Engineering, Civil
Liqun Jiang, Ronglin Sun, Wei Xiao, Xing Liang, Tian-Chyi Jim Yeh
Summary: Hydraulic conductivity (K) and specific storage (Ss) are closely related to factors such as porosity, connectivity of pores, and sorting of grains. Laboratory and numerical experiments were conducted to investigate the correlation between spatially varying K and Ss values and their sensitivity to overlying material stresses. The experiments confirmed the reliability of the tools and approaches used for estimating detailed K and Ss fields. The results showed that Ss is highly sensitive to overburden stresses, while K is not, and there is no clear spatial correlation between K and Ss. The variability of Ss is critical in predicting groundwater flow behavior.
JOURNAL OF HYDROLOGY
(2022)
Article
Psychology, Multidisciplinary
Daniel McNeish
Summary: This article introduces different methods for dealing with clustering issues in psychological data and emphasizes that the choice of statistical method should be guided by the research question. The article provides a user-friendly resource to help psychologists understand and apply these methods.
PSYCHOLOGICAL METHODS
(2023)
Article
Mathematics
Lilis Laome, I. Nyoman Budiantara, Vita Ratnasari
Summary: Geographically Weighted Regression (GWR) is a spatial data analysis method that uses multiple linear regression models. The assumption of spatial heterogeneity results in different characteristics for each location, making the relationships between the response variable and predictor variables unknown. Nonparametric regression is used as an alternative method to address this issue. This study introduces a Geographically Weighted Nonparametric Regression (GWNR) model with a mixed estimator of truncated spline and Fourier series. The estimator, determined using the Weighted Maximum Likelihood Estimator (WMLE) technique, is unbiased and shows a linear relationship with the response variable.
Article
Engineering, Mechanical
Xi Liu, Yang Wang, Erik Verriest
Summary: This paper introduces a unified minimum-mean-square-error (MMSE) estimation framework for the simultaneous input-state estimation problem in discrete-time linear stochastic systems with unknown input. It compares the FIC estimator with other estimators, demonstrating its superiority in handling unknown input dynamics.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Optics
Yen-Te Ho, Yu-Li Wang, Liang-Cheng Chang, Tzu-Pin Wang, Jui-Pin Tsai
Summary: The study presents a multilevel monitoring system (MLMS) developed using fiber Bragg grating (FBG) technology to observe the depth-discrete aquifer status. Laboratory and field tests demonstrated high accuracy and stability of the system in measuring groundwater parameters.
Article
Mechanics
Nathan Shauer, C. Armando Duarte
Summary: This article extends a 3-D methodology for the simulation of hydraulic fracture propagation to consider the simultaneous propagation and interaction of multiple fractures. The methodology uses the Generalized Finite Element Method (GFEM) to handle the solid mesh and the fluid flow in the fractures, and adopts the Reynolds lubrication theory for the fluid flow. The GFEM allows for improved accuracy around the fracture front with the use of singular enrichment functions, and the discretization error is controlled by employing mesh adaptivity. The method also models the fluid partitioning among fractures using the wellbore and accounts for pressure losses between wellbore and fractures.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Zhanfeng Zhao, Ning Luo, Walter A. Illman
Summary: Hydraulic profiling tool (HPT) and hydraulic tomography (HT) are promising techniques for high-resolution characterization of surficial aquifer systems. HPT surveys provide rapid one-dimensional vertical profiles, while HT can estimate three-dimensional distributions of hydraulic parameters. This study evaluated the benefits of incorporating HPT profiles into HT for characterizing a highly heterogeneous glaciofluvial multi-aquifer-aquitard system. Results showed that combining HPT and HT improved the capture of spatial heterogeneity and refinement of layer boundaries, demonstrating the potential of these techniques for subsurface characterization.
JOURNAL OF HYDROLOGY
(2023)
Article
Mathematics, Applied
Dayang Dai, Dabuxilatu Wang
Summary: This paper introduces a generalized Liu-type estimator (GLTE) to address the multicollinearity problem in the logistic partially linear regression model. The GLTE is derived using the profile likelihood method and it includes several existing estimators as special cases. The superiority of GLTE over other estimators is demonstrated and optimal choices for biasing parameters are provided. Numerical simulations show that GLTE outperforms existing estimators, and an application on real data is presented.
Article
Computer Science, Artificial Intelligence
Yulong Wang, Kit Ian Kou, Hong Chen, Yuan Yan Tang, Luoqing Li
Summary: This paper proposes a novel robust multi-view JSR method called Simultaneous Robust Matching Pursuit (SRMP) and applies it to multi-view data recovery, subspace clustering, and classification problems. Experimental results demonstrate the effectiveness and robustness of the method in multiple application scenarios.
PATTERN RECOGNITION
(2023)
Article
Engineering, Civil
Xu Gao, Tian-Chyi Jim Yeh, E-Chuan Yan, Yu-Li Wang, Yonghong Hao
Summary: This study discusses the relationship between hydraulic conductivity and hydraulic head through hydraulic measurements and conditional mean analysis methods such as Kriging and inverse modeling. By comparing the effects of different methods, the importance of conditional effective K in predicting heads is highlighted.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Mechanical
Chang-Guang Zhou, Shi-Hao Ren, Hu-Tian Feng, Jun-Wan Shen, Yi-Shen Zhang, Zeng-Tao Chen
Summary: A preload degradation model for LRG was proposed and experimentally verified, showing that factors such as external load, running speed, and fractal parameters affect the rate of preload loss. The numerical simulation results indicated the varying degrees of influence these factors have on the rate of preload loss in linear rolling guides.
Article
Environmental Sciences
Venkata Subbaiah Munagapati, Jet-Chau Wen, Chih-Long Pan, Yuvaraja Gutha, Jyh-Horng Wen, Guda Mallikarjuna Reddy
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2020)
Article
Biochemistry & Molecular Biology
Gutha Yuvaraja, Ning-Chao Zheng, Yixiong Pang, Minhua Su, Di-Yun Chen, Ling-Jun Kong, Sajid Mehmood, Munagapati Venkata Subbaiah, Jet-Chau Wen
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2020)
Article
Biochemistry & Molecular Biology
Gutha Yuvaraja, Minhua Su, Di-Yun Chen, Yixiong Pang, Ling-Jun Kong, Munagapati Venkata Subbaiah, Jet-Chau Wen, Guda Mallikarjuna Reddy
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2020)
Article
Chemistry, Physical
Venkata Subbaiah Munagapati, Hsin-Yu Wen, Jet-Chau Wen, Yuvaraja Gutha, Zhong Tian, Guda Mallikarjuna Reddy, Jarem Raul Garcia
Summary: Turkey tail fungus was used as an adsorbent for the removal of CR from aqueous solution, showing high adsorption capacity. The adsorption process was influenced by factors such as pH and temperature, and the PSO model was effective in describing the adsorption kinetics. The study demonstrated TTFB's potential as a recyclable and efficient adsorbent for CR removal.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Xu Gao, E-Chuan Yan, Tian-Chyi Jim Yeh, Xiao-Meng Yin, Jing-Sen Cai, Yong-Hong Hao, Jet-Chau Wen
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Civil
Fei Liu, Tian-Chyi Jim Yeh, Yu-Li Wang, Yonghong Hao, Jet-Chau Wen, Wenke Wang
JOURNAL OF HYDROLOGY
(2020)
Article
Engineering, Civil
Kwankwai Daranond, Tian-Chyi Jim Yeh, Yonghong Hao, Jet-Chau Wen, Wenke Wang
JOURNAL OF HYDROLOGY
(2020)
Article
Energy & Fuels
Shang-Ying Chen, Bieng-Zih Hsieh, Kuo-Chin Hsu, Yi-Fei Chang, Jia-Wei Liu, Kai-Chun Fan, Li-Wei Chiang, Yin-Lung Han
Summary: This study analyzes the minimum safe distance between doublet wells to maintain thermal productivity in the Huangtsuishan geothermal site. Results indicate that a distance of 300 m is required to avoid thermal breakthrough with specific pumping and reinjection rates. A regression formula is provided as a guideline for the minimum required doublet distance at various pumping rates.
Article
Computer Science, Interdisciplinary Applications
Shang-Ying Chen, Kuo-Chin Hsu, Chia-Ming Fan
Summary: This study introduces an improved version of the meshless generalized finite difference method (GFDM) for quantifying uncertainty in groundwater flow modeling. The proposed method outperforms conventional approaches in accuracy by utilizing a new support sub-domain.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Environmental Sciences
Shih-Yang Cheng, Kuo-Chin Hsu
Summary: The study proposes a Bayesian statistical method that integrates multiple secondary and primary data to improve regional characterization of hydraulic conductivity (K). Results indicate that correlation strength is the key factor in enhancing estimates, rather than the type of data. The method demonstrates high feasibility in a study conducted in Taiwan.
WATER RESOURCES RESEARCH
(2021)
Article
Computer Science, Interdisciplinary Applications
Shih-Jung Wang, Jian-Yu Chen, Kuo-Chin Hsu
Summary: The fundamental study of coupled thermal-hydraulic-mechanical systems is crucial in multiphysical fields. Results indicate that the size scale of the domain and THM properties are important factors in the coupled THM system.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
Shang-Ying Chen, Kuo-Chin Hsu, Chien-Li Wang
Summary: This study evaluates the impact of cement degradation on stress distribution in composite well systems using thermal-mechanical modeling. The results show significant changes in tensile hoop stress and radial stress due to cement degradation. Therefore, time-varying material properties should be considered when evaluating the integrity of cement sheaths in supercritical CO2 sequestration environments.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Geosciences, Multidisciplinary
Yu-Li Wang, Tian-Chyi Jim Yeh, Fei Liu, Jet-Chau Wen, Wenke Wang, Yonghong Hao
Summary: This paper utilizes triggered lightning as a point source for electromagnetic tomographic survey to image 3-D subsurface electrical properties in basins. It introduces a new temporal moment approach that overcomes the challenges in modeling 3-D Maxwell's equations with heterogeneous parameter fields. The results show that this approach can detect signals within a radius of 20-70 km and is suitable for mapping subsurface electric conductivity heterogeneity.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Water Resources
Yi-Hsuan Roger Chen, Hung-Wei Tseng, Kuo-Chin Hsu, Shang-Ying Chen, Chien-Chung Ke, Li-Chi Chiang
Summary: This study investigated the impact of climate change on water scarcity in the Wuling Mountain Watershed in Taiwan by integrating short-term hydrological data with physics-based meteorological and hydrological models. The results suggest that precipitation, water percolation, and streamflow will decrease in the dry season and increase in the wet season. Evapotranspiration showed variations throughout the year. Analysis also indicated possible acceleration of the water cycle and increased irregularity in surface water, while groundwater remained mildly persistent, serving as a buffer for the impact of climate change on water resources.
JOURNAL OF WATER AND CLIMATE CHANGE
(2023)
Article
Computer Science, Interdisciplinary Applications
Shang-Ying Chen, Jian-Yu Wei, Kuo-Chin Hsu
Summary: This paper proposes a novel data assimilation method, called dynamically adaptive node adjustment (DANA), which achieves real-time updating of data. The method effectively cooperates and improves the accuracy and computational efficiency of subsurface modeling.
ENGINEERING WITH COMPUTERS
(2023)
