A5101833923- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Analog and Mixed-Signal Circuit Design
- Groundwater and Isotope Geochemistry
- Advancements in PLL and VCO Technologies
- CCD and CMOS Imaging Sensors
- Hydrological Forecasting Using AI
- Groundwater flow and contamination studies
- Flood Risk Assessment and Management
- Radio Frequency Integrated Circuit Design
- Low-power high-performance VLSI design
- Advancements in Semiconductor Devices and Circuit Design
- Peatlands and Wetlands Ecology
- Fish Ecology and Management Studies
- Meteorological Phenomena and Simulations
- Groundwater and Watershed Analysis
- Cognitive Radio Networks and Spectrum Sensing
- HIV/AIDS Research and Interventions
- HIV/AIDS drug development and treatment
- Soil and Unsaturated Flow
- Hydrology and Drought Analysis
- Digital Filter Design and Implementation
- Sensor Technology and Measurement Systems
- Water Quality and Pollution Assessment
- Soil erosion and sediment transport
Helmholtz Centre for Environmental Research
2020-2024
Thuyloi University
2019
Leibniz University Hannover
2016-2019
Télécom Paris
2008-2018
Stanford University
2016-2017
Laboratoire Traitement et Communication de l’Information
2004-2016
Centre National de la Recherche Scientifique
2003-2016
Université Paris-Saclay
2016
University of California, Berkeley
2015
Institut Mines-Télécom
2012-2015
Groundwater salinization is considered as a major environmental problem in worldwide coastal areas, influencing ecosystems and human health. However, an accurate prediction of salinity concentration groundwater remains challenge due to the complexity processes its factors. In this study, we evaluate state-of-the-art machine learning (ML) algorithms for predicting identify We conducted study multi-layer aquifers Mekong River Delta (Vietnam), using geodatabase 216 samples 14 conditioning...
Abstract. In 2018–2019, Central Europe experienced an unprecedented 2-year drought with severe impacts on society and ecosystems. this study, we analyzed the impact of water quality by comparing long-term (1997–2017) nitrate export 2018–2019 in a heterogeneous mesoscale catchment. We combined data-driven analysis process-based modeling to analyze nitrogen retention underlying mechanisms soils during subsurface transport. found drought-induced shift concentration–discharge relationships,...
This brief proposes a new all-digital calibration technique suppressing the timing mismatch effect in time-interleaved analog-to-digital converters (TIADCs) for input at any Nyquist band (NB) using equivalent polyphase structure of TIADC. The correction is simple and does not require adaptive digital synthesis filters. estimated based on an stochastic gradient descent technique, which promising solution TIADCs operating very fast sampling rate. circuit proposed algorithm designed synthesized...
Cognitive radio system (CRS) is a which aware of its operational and geographical environment, established policies, internal state. It able to dynamically autonomously adapt parameters protocols learn from previous experience. Based on software‐defined (SDR), CRS provides additional flexibility offers improved efficiency overall spectrum use. disruptive technology targeting very high spectral efficiency. This paper presents an overview challenges with focus frequency (RF) section. We...
This paper presents a low-power fully digital clock skew feedforward background calibration technique in sub-sampling Time-Interleaved Analog-to-Digital Converters (TIADCs). Both estimation and correction algorithms share the common derivative filter, which makes them possible to reduce chip area. Furthermore, these use polyphase filtering do not adaptive synthesis filters. Thus, proposed can be implemented on moderate hardware cost with low power dissipation. The adopted technology...
Abstract StorAge Selection (SAS) functions describe how catchments selectively remove water of different ages in storage via discharge, thus controlling the transit time distribution (TTD) and solute composition discharge. SAS‐based models have been emerging as promising tools for quantifying catchment‐scale export, providing a coherent framework describing both velocity‐driven celerity‐driven transport. Due to their application headwaters only, spatial heterogeneity catchment physiographic...
Abstract. Environmental data are the key to defining and addressing water quality quantity challenges at catchment scale. Here, we present first large-sample set for 1386 German catchments covering a large range of hydroclimatic, topographic, geologic, land use, anthropogenic settings. QUADICA (water QUAlity, DIscharge Catchment Attributes studies in Germany) combines with data, meteorological nutrient forcing attributes. The comprises time series riverine macronutrient concentrations...
Nitrogen pollution in European landscapes poses persistent challenges to aquatic ecosystems, human health, and water quality. The Union has set a goal achieve zero by 2050, including the reduction of air, water, soil levels that no longer harm health or natural ecosystems. However, feasibility achieving this for legacy contaminants like nitrogen (N) under changing climate land-use management is not well understood. This study employs multimodel approach provide comprehensive assessment...
Excessive phosphorus (P) drives eutrophication in surface waters, contaminates groundwater, threatening aquatic ecosystems and drinking water quality. Legacy P from past agricultural urban inputs has shown to create nutrient reservoirs that continue fuel contemporary pollution. Different forms of P, such as total (TP) soluble reactive (SRP), may show distinct behavior. While SRP is critical because its bioavailability, TP determines the overall load system including already incorporated into...
Over the past seven decades, Germany has undergone transformative changes in wastewater management, largely driven by technological advancements, policy interventions, and introduction of European Union (EU) directives targeting treatment plants (WWTPs). Simultaneously, country experienced profound societal transformations, notably political economic divergence between East West shifts population density, which further influenced WWTP infrastructure management practices. This study focuses...
Despite decades of efforts to reduce nutrient pollution, Europe is still confronted with elevated concentrations in ground- and surface waters. This a result inputs from intensive agriculture, wastewater collection treatment atmospheric deposition. As consequence, inland marine waters suffer persistent eutrophication problems manifested as algal blooms, changes species composition, oxygen depletion, no full recovery seagrass. Water management must address this problem by finding additional...
Abstract The soil and water assessment tool (SWAT) has been widely used thoroughly tested in many places the world. application of SWAT model pointed out that 2 major weaknesses are related to nonspatial reference hydrologic response unit concept simplified groundwater concept, which contribute its low performance baseflow simulation inability simulate regional flow. This study modified module overcome above limitations. aquifers. local aquifer, is shallow aquifer original SWAT, represents a...
Abstract Understanding catchment controls on solute export is a prerequisite for water quality management. StorAge Selection (SAS) functions encapsulate essential information about functioning in terms of discharge selection preference and dynamics. However, they lack the spatial origin solutes when applied at scale, thereby limiting our understanding internal (subcatchment) functioning. Here, we parameterized SAS spatially explicit way to understand responses transport dynamics reactive...
Human activities have significantly perturbed the global cycle of nitrogen by excess inputs reactive (N) to environment (Rockström et al., 2009). The major anthropogenic sources N landscape are intensive agriculture associated with use mineral fertilizers and manure, atmospheric deposition resulting from burning fossil fuels biomass (Duce 2008). At scale, land surface much larger than sinks (Schlesinger, 2009) exceeded a critical level beyond which abrupt severe environmental change is...
Abstract Long‐term nitrogen (N) transport and retention dynamics across catchments are not well understood. Using a process‐based model for 89 German catchments, results study reveal that most N surplus (during 1950–2014) was removed by denitrification (mean ± standard deviation: 58 15%) while the remaining fraction mostly stored in soil (14% 11%). The mean groundwater transit times these varied from 3.2 to 20.3 years. These indicate past inputs could continue affect surface quality coming...
Journal Article A Stochastic Geometry Model for Cognitive Radio Networks Get access Tien Viet Nguyen, Nguyen INRIA/ENS, 45 rue d'Ulm, 75005 Paris, France Search other works by this author on: Oxford Academic Google Scholar François Baccelli * *Corresponding author: Francois.Baccelli@ens.fr The Computer Journal, Volume 55, Issue 5, May 2012, Pages 534–552, https://doi.org/10.1093/comjnl/bxr049 Published: 01 2012 history Received: 15 February 2011 Revision received: 21 April