Article
Construction & Building Technology
Xueming Du, Chang Liu, Chaojie Wang, Hongyuan Fang, Binghan Xue, Xinlei Gao, Yahong Han
Summary: This study investigated the diffusion characteristics of cement slurry in rock and soil media and examined the physico-chemical bonding mechanisms of consolidated specimens. The results showed that factors such as water-cement ratio, water flow speed, and fractal dimension of particles influenced the viscosity, porosity, and grouting pressure. Additionally, the compressive strength of the consolidated body decreased with the increase of water-cement ratio and distance.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Jiankai Dong, Wenke Zheng, Zhilin Ran, Bei Zhang
Summary: The newly designed radiant-convective heating terminal outperforms existing hybrid terminals in heating performance and can enhance heating efficiency under various conditions. Experimental results demonstrate significant improvements in heating capacity at different temperatures and flow rates for the novel terminal.
Article
Chemistry, Analytical
Mark Merrick, Leonid M. Blumberg
Summary: The optimal heating rate for achieving required separation performance in gas chromatography can be achieved using a fixed heating rate, which has been experimentally verified in both constant pressure and constant flow modes. The theory also suggests that the optimal fixed heating rate varies for different column conditions and flow rates.
JOURNAL OF SEPARATION SCIENCE
(2021)
Article
Environmental Sciences
Janusz Urbanski, Slawomir Bajkowski, Piotr Siwicki, Ryszard Oleszczuk, Andrzej Brandyk, Zbigniew Popek
Summary: Observed changes in hydrological conditions indicate the need for economical use of water. This study focuses on the use of water level regulators for efficient water management. Laboratory tests were conducted to evaluate the hydraulic characteristics and operating conditions of three innovative regulator solutions. The results show that the regulators with different structural designs offer varying levels of effectiveness in controlling water flow and maintaining the desired water level. The U and Z type regulators were found to have higher hydraulic efficiency compared to the S type regulator.
Article
Environmental Sciences
Daniel Scherer, Christian Schwatke, Denise Dettmering, Florian Seitz
Summary: The water surface slope (WSS) of rivers is crucial for flow velocity and discharge estimation. Altimetry missions' range measurements can be corrected using ICESat-2's lidar sensor to derive water level time series. ICESat-2 provides accurate measurements of WSS in small and wide rivers. The study shows that ICESat-2 can estimate average WSS with a median absolute error of 23 mm/km for 89% of the studied reaches, and the correction of WSS improves the measurement accuracy at virtual stations in the hydrological database.
WATER RESOURCES RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Slawomir Bajkowski, Janusz Urbanski, Ryszard Oleszczuk, Piotr Siwicki, Andrzej Brandyk, Zbigniew Popek
Summary: Economical management of water resources involves national-scale water management and drainage system management. This study focused on the hydraulic characteristics and operating conditions of three flow regulators. It was found that water leaks mainly occurred at embedded parts and joints of the regulators. Different regulator models had varying impacts on overflow shape and crest line development.
Article
Energy & Fuels
Li He, Chong Li, Yanlei Shang, Hongbo Ning, Jinchun Shi, Sheng-Nian Luo
Summary: In this study, the ignition characteristics of 1-nitropropane (1-NP) were investigated under different conditions. A new combustion model for 1-NP was proposed based on the experimental results. The results also revealed the dominant pathway and key intermediates involved in the ignition process of 1-NP.
Article
Physics, Fluids & Plasmas
Jiri Vacula, Pavel Novotny
Summary: The problem discussed in this study is about the basic principles of compressible flow of liquids and concludes that there are striking analogies between the behavior of liquids and ideal gas, based on the analysis and numerical simulations.
Article
Mathematics, Applied
Raul Villafuerte-Segura
Summary: This paper presents an analysis of designing, tuning, and applying delayed controllers for a general class of first-order up to fourth-order linear time-invariant (LTI) systems, with or without dead-time. The analysis is based on studying the characteristic equation to obtain Sigma-stabilization regions and place dominant roots in the left-half complex plane. The obtained results allow for the tuning and application of delayed controllers using analytic expressions for placing dominant real roots and recursive techniques for nonlinear systems with dead-time.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Geosciences, Multidisciplinary
Jana Erdbrugger, Ilja van Meerveld, Jan Seibert, Kevin Bishop
Summary: Shallow groundwater plays a crucial role in streamflow and hydrological models, but high-resolution datasets on groundwater levels are limited. To better understand groundwater dynamics, we installed a network of wells in the Krycklan catchment in Sweden, recording groundwater-level variations at frequent intervals. The dataset includes water-level measurements, groundwater chemistry analysis, and precise measurements of well locations, providing valuable information for testing groundwater models and evaluating hydrological connectivity.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Multidisciplinary Sciences
Mobarakeh Mohammadpour, Parisa Behnoud, Mohammad Reza Khorsand Movaghar
Summary: This article introduces a modeling method for production under constant wellbore pressure and enumerates the impact of wellbore storage effect in constant pressure well-test operations, which has been commonly neglected in previous studies.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Thomas D. W. Corbett, Adam Hartland, William Henderson, Gerald J. Rys, Louis A. Schipper
Summary: A novel Br--DGT technology was developed for accurate measurement of bromide concentrations in water, with high absorption and elution efficiencies, providing comparable results under different conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Mathematics, Applied
Xiuxiu Xu, Qiumei Huang
Summary: In this paper, a combined approach of discontinuous Galerkin (DG) time stepping method and standard finite element method in space is proposed to solve a class of semilinear parabolic differential equations with time constant delay. The time semi-discretization and the convergence analysis of the DG solution under suitable uniform meshes are derived. Numerical experiments for one-dimensional and two-dimensional equations are conducted to validate the theoretical results.
JOURNAL OF SCIENTIFIC COMPUTING
(2023)
Article
Energy & Fuels
Ritesh Prakash, Kalicharan Hembrom, Subrata Kumar Majumder
Summary: This study focuses on the demineralization of coal particles using a microstructured flotation column, analyzing the effects of operating variables on particle recovery, flotation rate, efficiency index, and ash content. By optimizing the flotation system, higher efficiency index and combustible recovery were achieved, while reducing the ash content in the concentrate.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Automation & Control Systems
S. Manikandan, Priyanka Kokil
Summary: This paper presents a stability analysis of network-controlled DC position servo system with time-delays. A less conservative delay-dependent stability criterion is proposed using Lyapunov-Krasvoskii functional and linear matrix inequality techniques. The maximum allowable time-delay called delay margin is computed for tuning the PI controller of the system.
Article
Water Resources
Mohammed Basheer, Rayyan Sulieman, Lars Ribbe
Summary: This study focuses on the management of hydropower generation, irrigation, and domestic water supply in the Tekeze-Atbara Basin, revealing significant benefits of coordinating the management of Sudanese dams. An optimization analysis is necessary to fully understand the value of dam coordination in the basin.
INTERNATIONAL JOURNAL OF WATER RESOURCES DEVELOPMENT
(2021)
Article
Environmental Sciences
Hassan Tolba Aboelnga, Hazim El-Naser, Lars Ribbe, Franz-Bernd Frechen
Article
Water Resources
Ian McNamara, Alexandra Nauditt, Mauricio Zambrano-Bigiarini, Lars Ribbe, Hamish Hann
Summary: In order to reduce poverty in drought-prone Araucania, the Chilean Irrigation Commission is planning to expand irrigated areas, but climate change may exacerbate seasonal water scarcity. By constructing reservoirs and improving irrigation efficiency, the unmet water demand can be significantly reduced.
INTERNATIONAL JOURNAL OF WATER RESOURCES DEVELOPMENT
(2021)
Article
Environmental Sciences
Lilian Daphine Lunyolo, Muhammad Khalifa, Lars Ribbe
Summary: Rainfed agriculture is the mainstay of Uganda's economy, but it is vulnerable to climate change. Research has found that net primary productivity of farmlands is sensitive to climate variability, with varying degrees of sensitivity among different regions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
David Mengen, Marco Ottinger, Patrick Leinenkugel, Lars Ribbe
Article
Water Resources
Ian McNamara, Oscar M. Baez-Villanueva, Ali Zomorodian, Saher Ayyad, Mauricio Zambrano-Bigiarini, Modathir Zaroug, Azeb Mersha, Alexandra Nauditt, Milly Mbuliro, Sowed Wamala, Lars Ribbe
Summary: This study focused on evaluating the performance of precipitation (P) and actual evapotranspiration (ETa) products over the Nile Basin in Africa, finding the best-performing products for both variables. The study used a four-step procedure to assess the products and demonstrated how they can be evaluated over data-scarce conditions using a transferable methodology. The results provide new hydrological insights for the region, particularly in understanding the seasonality of terrestrial water storage.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2021)
Article
Environmental Sciences
Islam Yousef Hasan Daoud, Sudeh Dehnavi, Lars Ribbe
Summary: Jordan, considered one of the most water-scarce countries in the world, has taken steps towards good water governance. However, research shows that there is room for improvement. This study evaluates water security governance in Jordan and identifies gaps and challenges in good water governance. The findings highlight the importance of implementing good water governance principles and practices to achieve water security.
ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Alexandra Nauditt, Kerstin Stahl, Erasmo Rodriguez, Christian Birkel, Rosa Maria Formiga-Johnsson, Marko Kallio, Lars Ribbe, Oscar M. Baez-Villanueva, Joschka Thurner, Hamish Hann
Summary: Droughts are causing severe damages to tropical countries worldwide. Little knowledge about tropical drought characteristics exists, calling for reliable methodologies to evaluate drought risk in data scarce tropical regions. This study combined drought hazard and vulnerability related data to assess drought risk in four rural tropical study regions, providing relevant information for regional planners and water managers dealing with future drought disasters.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Development Studies
David Lewis, M. Feisal Rahman, Revocatus Twinomuhangi, Shababa Haque, Nazmul Huq, Saleemul Huq, Lars Ribbe, Asif Ishtiaque
Summary: Responding effectively to the climate crisis requires strong links between science and policy. This is particularly challenging for climate science due to its interdisciplinary nature and political challenges. A study conducted with university-based researchers from four countries found that researchers have different attitudes towards policy engagement, use diverse methods, prefer working with government and civil society, and desire more university support. The findings suggest a need to rethink engagement conditions, prioritize interdisciplinary research approaches, improve connections with the private sector, and strengthen university-community research links.
EUROPEAN JOURNAL OF DEVELOPMENT RESEARCH
(2023)
Article
Agronomy
Saher Ayyad, Poolad Karimi, Matthias Langensiepen, Lars Ribbe, Lisa-Maria Rebelo, Mathias Becker
Summary: Producing more food for a growing population requires sustainable crop intensification and diversification, with a focus on efficient use of existing green water resources for cultivating short-cycled crops in seasonal floodplain wetlands.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Environmental Sciences
Kaushal Chapagain, Hassan Tolba Aboelnga, Mukand S. Babel, Lars Ribbe, Victor R. Shinde, Devesh Sharma, Nguyen Mai Dang
Summary: This study applies an integrative indicator-based urban water security assessment framework to evaluate the water security state in five cities in Asia and suggests steps to improve urban water management. Hanoi has the best water security condition among these cities.
ENVIRONMENTAL DEVELOPMENT
(2022)
Article
Environmental Sciences
Mohamed Allani, Aymen Frija, Rabiaa Nemer, Lars Ribbe, Ali Sahli
Summary: Decisions on irrigation water management are usually made at different levels, but information and decision tools remain out of reach for the final water users, namely farmers. A study conducted in Cherfech, Tunisia, found that while only 54% of farmers were satisfied with WUAs, 77% were willing to accept and pay for an irrigation advisory service, showing financial viability and potential water savings at the WUA level.
Article
Geosciences, Multidisciplinary
Oscar M. Baez-Villanueva, Mauricio Zambrano-Bigiarini, Pablo A. Mendoza, Ian McNamara, Hylke E. Beck, Joschka Thurner, Alexandra Nauditt, Lars Ribbe, Nguyen Xuan Thinh
Summary: This study examined and compared the performance of three parameter regionalisation techniques in different hydrological regimes across Chile using four gridded daily precipitation (P) products. The results showed that feature similarity provided the best results, followed by spatial proximity, while parameter regression resulted in the worst performance. Model calibration was able to compensate for differences in precipitation forcings to some extent.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
Article
Environmental Sciences
Sibel R. Ersoy, Julia Terrapon-Pfaff, Lars Ribbe, Ahmed Alami Merrouni
Summary: Water availability plays a crucial role in the development of solar thermal and photovoltaic power plants in the Draa Valley of Morocco. Climate change is expected to decrease water availability while socio-economic development and energy scenarios predict an increase in water demand, leading to potential competition among oasis farming, drinking water, and energy production. Implementing dry cooling technologies and reducing socio-economic demand, particularly in agriculture, are suggested as ways to alleviate the scarcity of water resources in the region.
JOURNAL OF SUSTAINABLE DEVELOPMENT OF ENERGY WATER AND ENVIRONMENT SYSTEMS-JSDEWES
(2021)
Proceedings Paper
Agriculture, Multidisciplinary
Neda Abbasi, Christian Opp, Lars Ribbe, Oscar Manuel Baez-Villanueva, Ali Asghar Besalatpour
2020 MEDITERRANEAN AND MIDDLE-EAST GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (M2GARSS)
(2020)