Article
Multidisciplinary Sciences
D. C. P. Jorge, J. F. Oliveira, J. G. V. Miranda, R. F. S. Andrade, S. T. R. Pinho
Summary: The effective reproduction number, R(t), which indicates the average number of new infections caused by an infected individual during an epidemic, is crucial in studying infectious diseases. Current estimation methods for R(t) rely on the generation interval distribution, g(tau), which is often obtained from empirical data or theoretical studies. However, for systems that exhibit heterogeneity, there is a lack of data and a general methodology for obtaining g(tau). In this work, mathematical models are used to bridge this gap and provide a general methodology for obtaining explicit expressions of R(t) and g(tau) within and between model sub-compartments. This methodology is applied to the spread of COVID-19 in municipalities of the state of Rio de Janeiro, Brazil to showcase its relevance.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Ecology
Manuele Bazzichetto, Jonathan Lenoir, Daniele Da Re, Enrico Tordoni, Duccio Rocchini, Marco Malavasi, Vojtech Bartak, Marta Gaia Sperandii
Summary: The aim of this study was to assess how different sampling strategies affect the accuracy and precision of species response curves estimated by parametric species distribution models. The researchers simulated the occurrence of virtual plant species in Italy, using various sampling strategies, and compared the results to true coefficients. The study found that uniformly sampling the environmental space provided the best results for generalist species, while sampling occurrence data close to roads had the worst performance. For specialist species, all sampling designs showed comparable outcomes.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2023)
Article
Chemistry, Physical
Sina Stocker, Hyunwook Jung, Gabor Csanyi, C. Franklin Goldsmith, Karsten Reuter, Johannes T. Margraf
Summary: This study demonstrates that machine-learning methods can be used to predict the rate constants of elementary reaction steps in catalytic processes. The results show that thermal effects have a significant impact on the free energy barriers, which can be different from the predictions based on the harmonic transition state theory approximation. This finding calls into question the previously reported mechanisms established by microkinetic models.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Computer Science, Interdisciplinary Applications
He Chen, Shi-Jin Feng
Summary: This study develops a generalized constitutive model to describe hydraulic properties of soils considering soil heterogeneity and water distribution. The model assumes pore size distribution as a fractal characteristic and includes water retention curve, relative water permeability curve, and relative air permeability curve. Validation results show that the proposed model predicts relative water permeability and relative air permeability of unsaturated soils well. It also outperforms other models for most data sets. The influence of dual-porosity characteristic of structured soils on hydraulic properties is addressed.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Haixu Wang, Jiguo Cao
Summary: ODE models are widely used to characterize dynamical systems, but the parameters are often unknown. This paper introduces a new method called pCODE, which can estimate the ODE parameters without the need for providing derivatives and Hessian matrices. The pCODE package is easy to understand and apply, and it also includes an online application.
Article
Engineering, Multidisciplinary
Hadi Fattahi
Summary: This paper proposes two novel hybrid optimization models for predicting the value of the effective stress parameter in dealing with unsaturated soils. The models' prediction abilities are demonstrated and evaluated using statistical metrics. The findings show that the harmony search algorithm plays a significant role in optimizing the proposed model.
Article
Engineering, Electrical & Electronic
Shuai Xu, Luwei Tao, Chen Liu, Guoqiang Han
Summary: This article proposes a novel cost-effective phase current sensing scheme for SRM drives, which improves detection accuracy through an online error correction strategy. The scheme reduces system cost by employing sensor multiplexing and multiple information measurement, and solves current sensor offset and scaling errors using an online error correction method.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Civil
Dongfang Ke, Rong Li, Chongxuan Liu
Summary: Biogeochemical reactions play a crucial role in controlling the cycle and transformation of subsurface materials, but their rates vary with observation scales. This study summarizes the main factors affecting the estimation of effective parameters and discusses their variations in numerical simulations. The results show that substrate sources greatly affect the estimation of effective parameters. Under scenarios with identical substrate sources, the effective parameters are similar to the intrinsic parameters, allowing for direct estimation of macroscopic effective reaction rates. However, scenarios with different substrate sources often result in overestimated macroscopic effective rates, which decrease with increasing flow velocity.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Xudong Zhou, Menaka Revel, Prakat Modi, Takuto Shiozawa, Dai Yamazaki
Summary: This study proposes a simple and robust method for correcting river bathymetry by comparing the bias between stage-discharge rating curves. The method is able to reduce the absolute bias compared to traditional methods and is robust to runoff deviations.
WATER RESOURCES RESEARCH
(2022)
Article
Computer Science, Artificial Intelligence
Zaigham Tahir, Hina Khan, Muhammad Aslam, Javid Shabbir, Yasar Mahmood, Florentin Smarandache
Summary: The research under neutrosophic statistics introduces new estimators for handling ambiguous and uncertain data, improving the accuracy and efficiency of estimations.
COMPLEX & INTELLIGENT SYSTEMS
(2021)
Article
Statistics & Probability
Junmei Zhou, Liqin Li
Summary: The two-parameter gamma distribution, an important probability distribution with moderate skewness, is extensively used in statistics. However, the maximum likelihood estimators (MLEs) of its parameters lack closed forms, posing challenges for practical implementation. Additionally, the MLE of its shape parameter is characterized by low estimation efficiency due to significant bias. Consequently, alternative estimators have been explored in existing literature. This article proposes an easily computable MLE technique, with the modified MLE of the shape parameter demonstrating high efficiency and outperforming most existing estimators.
COMMUNICATIONS IN STATISTICS-THEORY AND METHODS
(2023)
Article
Engineering, Industrial
Pablo-Ramses Alonso-Martin, Ignacio Montes, Enrique Miranda
Summary: Human Reliability Analysis aims to address the hazardous consequences caused by human factors. We propose an alternative based on distortion models to quantify the influence of human factors and provide robust estimations.
Article
Mathematics, Interdisciplinary Applications
Xue Zhang, Chun Wang
Summary: The study utilized a two-stage divide-and-conquer strategy and proposed a novel method to correct measurement biases and errors, achieving better recovery of structural parameters.
BRITISH JOURNAL OF MATHEMATICAL & STATISTICAL PSYCHOLOGY
(2021)
Article
Psychology, Multidisciplinary
Tristan D. Tibbe, Amanda K. Montoya
Summary: This study proposes two alternative bias-correction methods for creating confidence intervals around the indirect effect. Comparisons with other methods using a Monte Carlo simulation show that these methods fall between the BCBCI and PBCI in terms of balance, power, and type I error rate. An extension of the simulation suggests that the increased power of these alternative methods might be due to their higher type I error rates. Therefore, the PBCI is still recommended if control over the type I error rate is desired for inference on the indirect effect.
FRONTIERS IN PSYCHOLOGY
(2022)
Article
Multidisciplinary Sciences
Xiaoxiao Cheng
Summary: In the past few decades, the rise of digital media has made the internet an important source for public to acquire environmental knowledge. This study investigates the heterogeneous treatment effects of internet use on environmental knowledge among the Chinese population. Based on a nationwide survey, the findings reveal significant positive associations between internet access/use and environmental knowledge. The study also suggests that individuals who are least likely to access the internet benefit the most from internet access and use in terms of knowledge gains, indicating the potential of digital media to narrow the environmental knowledge gap.
Article
Environmental Sciences
V. Roezer, A. Peche, S. Berkhahn, Y. Feng, L. Fuchs, T. Graf, U. Haberlandt, H. Kreibich, R. Saemann, M. Sester, B. Shehu, J. Wahl, I. Neuweiler
Summary: Pluvial floods in urban areas are caused by local, fast storm events with high rainfall rates, which may increase the risk of flooding. The current warnings are mostly limited to rainfall intensities over larger areas, but a new impact-based forecasting system shows potential in providing more detailed and timely warnings. The system includes models for rainfall forecast, inundation, contaminant transport, and damage prediction, with the ability to provide early warnings up to 5 min before extreme rainfall events.
Article
Biology
Dianlei Feng, Insa Neuweiler, Regina Nogueira, Udo Nackenhorst
Summary: A multi-dimensional continuum mathematical model is presented for modeling the growth of a symbiotic biofilm system, with numerical investigations on a Streptococcus-Veillonella sp. biofilm system. The model describes the cooperation and competition between bacterial species, with results showing capability in describing symbiotic behavior but localized homogenization. Numerical investigations on random initial biomass distribution influencing homogenization process, as well as more realistic scenarios with bacteria in patches, are also carried out.
BULLETIN OF MATHEMATICAL BIOLOGY
(2021)
Article
Engineering, Civil
Robert Saemann, Thomas Graf, Insa Neuweiler
Summary: This study focused on four distance metrics for temporal rainfall patterns in urban flood warning systems, evaluating their performance in forecast accuracy. By utilizing a forecasting system and database, decision-making processes for flood forecasts were expedited.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Environmental
Satoshi Izumoto, Johan Alexander Huisman, Egon Zimmermann, Joris Heyman, Francesco Gomez, Herve Tabuteau, Romain Laniel, Harry Vereecken, Yves Meheust, Tanguy Le Borgne
Summary: Studying the calcite precipitation process that induces SIP response, it was observed that the amplitude of SIP response significantly increased as the volume of precipitates increased in a geoelectrical millifluidic setup. Additionally, the spatial variation in peak frequency was found to be related to the macroscopic shape of the front, challenging assumptions in the classical grain polarization model.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Martial Tazifor, Egon Zimmermann, Johan Alexander Huisman, Markus Dick, Achim Mester, Stefan Van Waasen
Summary: This study presents a novel correction method for mitigating drift effects in EMI instruments. By modeling the dynamic characteristics of drift using a low-pass filter, the method improves the accuracy of the measurements and reduces the overall error.
Article
Engineering, Civil
Yi Yu, Johan Alexander Huisman, Anja Klotzsche, Harry Vereecken, Lutz Weihermueller
Summary: This study proposes a workflow for coupled GPR full-waveform inversion (CFWI) to estimate soil hydraulic properties. The research finds that CFWI can accurately estimate the thickness of soil layers and provide precise water retention and hydraulic conductivity functions.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
J. Jakobi, J. A. Huisman, H. Fuchs, H. Vereecken, H. R. Bogena
Summary: Cosmic-ray neutron sensors (CRNS) are used to determine soil moisture content by measuring the hydrogen contained in the soil moisture. However, other hydrogen pools, such as biomass, should also be considered for accurate measurements. This study tested four different approaches to correct for biomass effects on soil moisture content measurements with CRNS and found that taking into account in-situ measured biomass or using thermal neutron intensity for correction improved the accuracy of the measurements. The study also explored the use of CRNS for biomass estimation and found significant site-specific relationships between biomass and thermal neutron intensity for all three crops tested.
WATER RESOURCES RESEARCH
(2022)
Review
Chemistry, Analytical
Heye Reemt Bogena, Ansgar Weuthen, Johan Alexander Huisman
Summary: This review paper presents the current status of wireless sensor network (WSN) technology for distributed, near real-time sensing of soil moisture and discusses its contributions to the validation of satellite data, non-invasive geophysical instruments, and hydrological models. The future perspectives for WSN measurements of soil moisture are also highlighted.
Article
Environmental Sciences
Teng Xia, Min Ma, Johan Alexander Huisman, Chuanpeng Zheng, Cuiling Gao, Deqiang Mao
Summary: This study conducted laboratory experiments to simulate the remediation of diesel-contaminated soil using the base-activated persulfate method. Electrical resistivity tomography was used to monitor the process. The results showed a significant decrease in resistivity and an increase in chemical parameters after persulfate injection. The study also found that the decrease in resistivity was not solely due to contaminant degradation but also the influence of oxidation products.
JOURNAL OF CONTAMINANT HYDROLOGY
(2023)
Article
Chemistry, Analytical
Felix Nieberding, Johan Alexander Huisman, Christof Huebner, Bernd Schilling, Ansgar Weuthen, Heye Reemt Bogena
Summary: In this study, three different soil moisture profile sensors (SMPSs) were evaluated in terms of measurement accuracy, sensor-to-sensor variability, and temperature stability. The Drill & Drop sensor showed the highest temperature sensitivity but the lowest variability. The field experiment showed that all three SMPSs performed similarly, with higher uncertainties at intermediate soil moisture contents.
Article
Geosciences, Multidisciplinary
Thomas Hermans, Pascal Goderniaux, Damien Jougnot, Jan H. Fleckenstein, Philip Brunner, Frederic Nguyen, Niklas Linde, Johan Alexander Huisman, Olivier Bour, Jorge Lopez Alvis, Richard Hoffmann, Andrea Palacios, Anne-Karin Cooke, Alvaro Pardo-Alvarez, Lara Blazevic, Behzad Pouladi, Peleg Haruzi, Alejandro Fernandez Visentini, Guilherme E. H. Nogueira, Joel Tirado-Conde, Majken C. Looms, Meruyert Kenshilikova, Philippe Davy, Tanguy Le Borgne
Summary: This paper discusses the interest and potential for monitoring and characterizing spatial and temporal variability in hydrogeological processes, and proposes a classification of processes and applications at different scales based on high-resolution space-time imaging. The authors call for the validation of 4D imaging techniques at highly instrumented observatories and the harmonization of open databases to share hydrogeological data sets in their 4D components.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Cosimo Brogi, Heye Reemt Bogena, Markus Koehli, Johan Alexander Huisman, Harrie-Jan Hendricks Franssen, Olga Dombrowski
Summary: This study investigates the feasibility of monitoring irrigation with cosmic-ray neutron sensors (CRNSs) and finds challenges with contributions from outside irrigated fields. Thin high-density polyethylene (HDPE) moderators result in smaller footprints while thick HDPE moderators with gadolinium shielding improve monitoring in irrigated fields. Retrieving soil moisture (SM) data from surrounding areas is important to obtain meaningful information for irrigation management.
GEOSCIENTIFIC INSTRUMENTATION METHODS AND DATA SYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Maximilian Weigand, Egon Zimmermann, Valentin Michels, Johan Alexander Huisman, Andreas Kemna
Summary: Spectral electrical impedance tomography (sEIT) is widely used for characterizing the structure of subsurface systems and monitoring hydrogeophysical and biogeophysical processes. By combining multiple spectroscopic measurements with tomographic inversion algorithms, sEIT can provide images of the complex electrical resistivity distribution in the subsurface at various frequencies. However, spectral impedance measurements are sensitive to measurement setup details and external noise. Long-term monitoring with fixed setups is still rare.
GEOSCIENTIFIC INSTRUMENTATION METHODS AND DATA SYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Bernd Schalge, Gabriele Baroni, Barbara Haese, Daniel Erdal, Gernot Geppert, Pablo Saavedra, Vincent Haefliger, Harry Vereecken, Sabine Attinger, Harald Kunstmann, Olaf A. Cirpka, Felix Ament, Stefan Kollet, Insa Neuweiler, Harrie-Jan Hendricks Franssen, Clemens Simmer
Summary: Coupled numerical models that simulate water and energy fluxes are crucial for analyzing and understanding exchange fluxes. Simulated catchment behavior closely resembles real-world observations, but also highlights areas for model improvement.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Geosciences, Multidisciplinary
Natascha Brandhorst, Daniel Erdal, Insa Neuweiler
Summary: This study focuses on comparing two coupling approaches, one iterative and the other non-iterative. The iterative method yielded good results in all cases, while the non-iterative approach, although faster, did not provide good accuracy for the model parameters in all applied test cases.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)