Influence characteristics of regional micrometeorology on macroscopic scale of external dump

To study the relationship of external dump of opencast coal mine impacting on surrounding micrometeorological factors, and then provide the foundation acknowledge for the ecological restoration in mining area, the airflow movement and water distribution around the mine area were regarded as the influencing factors to furtherly explore the ecological effects of the scale and form of the external dump. Taking Hongshaquan open-pit coal mine as an example, using Fluent fluid simulation software, adopting large eddy simulation and component transfer model, the external dump models with different heights and angles were established for simulation. The monthly temperature and dew point data of the area in 2020 were obtained through the regional meteorological station where Hongshaquan open-pit coal mine located, thereby reaching the monthly condensation height of the area. By analyzing the cloud diagrams of air velocity and moisture mass fraction under different conditions, the influence law of different sizes of external dump on the surrounding air flow movement and water distribution was obtained, and compared with the condensation height in the area. The numerical simulation results showed that: with the increasing dump height, the air climbing speed increased slowly, while the maximum climbing height increased, as well as the moisture mass fraction on the windward slope and the dump top ascended. More and more obvious Karman vortex street phenomenon was formed along the leeward slope. The number of vortices increased and the influence range became larger. Both of the airflow velocity and moisture mass fraction in the vortex area increased and reached their maximum values. The increase in the angle of the external dump presented a significant impact on the maximum climb height of the airflow, but showed little impact on the surrounding micrometeorological factors. Under the condition of 360 m limit height, when the external dump Angle reached the critical value of 26°, the maximum airflow climbing height would reach the summer condensation height in this area. Alternatively, under the condition of 22° limit Angle of the outer dump, when the height of the outer dump reached the critical value of 380 m, the maximum climbing height of airflow would reach the summer condensation height of the region, thereby promoting the precipitation around the mining are

Analysis of the performance of GNSS receiver in monitoring the behaviour of the wind turbine nacelle

Wind turbines are frequently employed to harness the kinetic energy of the wind for electricity generation, and they are anticipated to encounter diverse wind forces that could lead to potentially severe structural reactions. Hence, structural health monitoring is an essential task for safe and productive operation of wind turbines. The structural health monitoring of wind turbines is usually conducted using strain gauges, accelerometers, etc., while few studies have applied Global Navigation Satellite System (GNSS) technology for monitoring the response of wind turbines. This study is the first attempt to evaluate the performance of GNSS receivers in monitoring the behaviour of the nacelle of a wind turbine. For the purpose of this study, we conducted experiments where the position and behaviour of the nacelle was recorded by an array of GNSS receivers strategically positioned on a wind turbine nacelle. A GNSS base station was used for post-processing the GNSS raw data and the GNSS time-series were analysed to evaluate the GNSS receivers’ performance. Two experiments were conducted. In the first experiment, we evaluated the performance of the GNSS receivers depending on their position on the nacelle and analysed of the precision of the estimation of nacelle position and orientation. In the second experiment, we assessed the GNSS performance under different configurations of nacelle and turbine blade movements, considering scenarios where the nacelle was either stationary or subjected to rotation, and the turbine blades were either stationary or in motion. As the first pioneering study in wind turbine nacelle monitoring with GNSS, in the study, we present the main results of the performance of GNSS receivers in monitoring the behaviour of the nacelle of wind turbine and we develop methodologies in GNSS data analysis to enhance the precision of the GNSS time-series. The study revealed a planar precision range of 5–7 mm during blade rotation, improving to 4–6 mm when the blade slows or stops, alongside a high precision of 1.6 degrees for nacelle bearing determination using GNSS coordinates

Assemblages polymétalliques luminescents à base de précurseurs pré-assemblés polymétalliques Cu(I)

The thesis presents the synthesis and the study of novel multimetallic light-emitting assemblies based on Cu(I) polymetallic preassembled precursors. The chapter I introduces the background of the thesis. The chapter II reports the preparation of lightemitting Cu(I) polymetallic assemblies bearing a rare bridging aqua ligand on two Cu(I) metal centers. The syntheses, characterizations, and solid-state photophysical proprieties are described in detail. Most of these assemblies present TADF relaxation processes. Importantly one of these derivatives presents a unique irreversible solid-state thermal transition behavior of the luminescence properties with eye-perceived change of the emitted color. The origin of this unconventional property is studied in detail and highlighted. The chapter III reports the preparation of four new luminescent complexes with impressive TADF photophysical properties through a facile synthetic procedure based on the use of Cu(I) dimer precursors. The syntheses, characterizations, and solid-state photophysical proprieties are described in detail. The influence of the solid-state large range organization in the crystals is highlighted allowing to identify its crucial impacts on the emission behaviors.Le travail de cette thèse est la synthèse et l’étude de nouveaux assemblages luminescents multimétalliques à base de précurseurs pré-assemblés polymétalliques Cu(I). Le chapitre I présente le contexte d'étude de la thèse. Le chapitre II rapporte la préparation d'assemblages polymétalliques Cu(I) émetteurs de lumière portant un ligand aqua présentant un mode de coordination rare sur deux centres métalliques Cu(I). Les synthèses, les caractérisations et les propriétés photophysiques à l'état solide sont décrites en détail. La plupart de ces assemblages présentent des processus de relaxation TADF. Il est important de noter que l'un de ces dérivés présente un comportement unique de transition thermique à l'état solide irréversible des propriétés de luminescence avec un changement perçu par l'oeil de la couleur émise. L'origine de cette propriété non conventionnelle est étudiée en détail et mise en lumière. Le chapitre III rapporte la préparation de quatre nouveaux complexes luminescents avec des propriétés photophysiques TADF exaltés basées à une procédure de synthèse facile basée sur l'utilisation de précurseurs dimères de Cu(I). Les synthèses, les caractérisations et les propriétés photophysiques à l'état solide sont décrites en détail. L'influence de l'organisation de l'état solide à large échelle dans les cristaux est mise en évidence permettant d'identifier ses impacts cruciaux sur les comportements d'émission

Assemblages polymétalliques luminescents à base de précurseurs pré-assemblés polymétalliques Cu(I)

The thesis presents the synthesis and the study of novel multimetallic light-emitting assemblies based on Cu(I) polymetallic preassembled precursors. The chapter I introduces the background of the thesis. The chapter II reports the preparation of lightemitting Cu(I) polymetallic assemblies bearing a rare bridging aqua ligand on two Cu(I) metal centers. The syntheses, characterizations, and solid-state photophysical proprieties are described in detail. Most of these assemblies present TADF relaxation processes. Importantly one of these derivatives presents a unique irreversible solid-state thermal transition behavior of the luminescence properties with eye-perceived change of the emitted color. The origin of this unconventional property is studied in detail and highlighted. The chapter III reports the preparation of four new luminescent complexes with impressive TADF photophysical properties through a facile synthetic procedure based on the use of Cu(I) dimer precursors. The syntheses, characterizations, and solid-state photophysical proprieties are described in detail. The influence of the solid-state large range organization in the crystals is highlighted allowing to identify its crucial impacts on the emission behaviors.Le travail de cette thèse est la synthèse et l’étude de nouveaux assemblages luminescents multimétalliques à base de précurseurs pré-assemblés polymétalliques Cu(I). Le chapitre I présente le contexte d'étude de la thèse. Le chapitre II rapporte la préparation d'assemblages polymétalliques Cu(I) émetteurs de lumière portant un ligand aqua présentant un mode de coordination rare sur deux centres métalliques Cu(I). Les synthèses, les caractérisations et les propriétés photophysiques à l'état solide sont décrites en détail. La plupart de ces assemblages présentent des processus de relaxation TADF. Il est important de noter que l'un de ces dérivés présente un comportement unique de transition thermique à l'état solide irréversible des propriétés de luminescence avec un changement perçu par l'oeil de la couleur émise. L'origine de cette propriété non conventionnelle est étudiée en détail et mise en lumière. Le chapitre III rapporte la préparation de quatre nouveaux complexes luminescents avec des propriétés photophysiques TADF exaltés basées à une procédure de synthèse facile basée sur l'utilisation de précurseurs dimères de Cu(I). Les synthèses, les caractérisations et les propriétés photophysiques à l'état solide sont décrites en détail. L'influence de l'organisation de l'état solide à large échelle dans les cristaux est mise en évidence permettant d'identifier ses impacts cruciaux sur les comportements d'émission

Assemblages polymétalliques luminescents à base de précurseurs pré-assemblés polymétalliques Cu(I)

Le travail de cette thèse est la synthèse et l’étude de nouveaux assemblages luminescents multimétalliques à base de précurseurs pré-assemblés polymétalliques Cu(I). Le chapitre I présente le contexte d'étude de la thèse. Le chapitre II rapporte la préparation d'assemblages polymétalliques Cu(I) émetteurs de lumière portant un ligand aqua présentant un mode de coordination rare sur deux centres métalliques Cu(I). Les synthèses, les caractérisations et les propriétés photophysiques à l'état solide sont décrites en détail. La plupart de ces assemblages présentent des processus de relaxation TADF. Il est important de noter que l'un de ces dérivés présente un comportement unique de transition thermique à l'état solide irréversible des propriétés de luminescence avec un changement perçu par l'oeil de la couleur émise. L'origine de cette propriété non conventionnelle est étudiée en détail et mise en lumière. Le chapitre III rapporte la préparation de quatre nouveaux complexes luminescents avec des propriétés photophysiques TADF exaltés basées à une procédure de synthèse facile basée sur l'utilisation de précurseurs dimères de Cu(I). Les synthèses, les caractérisations et les propriétés photophysiques à l'état solide sont décrites en détail. L'influence de l'organisation de l'état solide à large échelle dans les cristaux est mise en évidence permettant d'identifier ses impacts cruciaux sur les comportements d'émission.The thesis presents the synthesis and the study of novel multimetallic light-emitting assemblies based on Cu(I) polymetallic preassembled precursors. The chapter I introduces the background of the thesis. The chapter II reports the preparation of lightemitting Cu(I) polymetallic assemblies bearing a rare bridging aqua ligand on two Cu(I) metal centers. The syntheses, characterizations, and solid-state photophysical proprieties are described in detail. Most of these assemblies present TADF relaxation processes. Importantly one of these derivatives presents a unique irreversible solid-state thermal transition behavior of the luminescence properties with eye-perceived change of the emitted color. The origin of this unconventional property is studied in detail and highlighted. The chapter III reports the preparation of four new luminescent complexes with impressive TADF photophysical properties through a facile synthetic procedure based on the use of Cu(I) dimer precursors. The syntheses, characterizations, and solid-state photophysical proprieties are described in detail. The influence of the solid-state large range organization in the crystals is highlighted allowing to identify its crucial impacts on the emission behaviors

High-Resolution Through-the-Wall Radar Imaging with Exploitation of Target Structure

It is quite challenging for through-the-wall radar imaging (TWRI) to achieve high-resolution ghost-free imaging with limited measurements in an indoor multipath scenario. In this paper, a novel high-resolution TWRI algorithm with the exploitation of the target clustered structure in a hierarchical Bayesian framework is proposed. More specifically, an extended spike-and-slab clustered prior is imposed to statistically encourage the cluster formations in both downrange and crossrange domains of the target region, and a generative model of the proposed approach is provided. Then, a Markov Chain Monte Carol (MCMC) sampler is used to implement the posterior inference. Compared to other state-of-the-art algorithms, the proposed nonparametric Bayesian algorithm can preserve underlying target clustered properties and effectively suppress these isolated spurious scatterers without any prior information on targets themselves, such as sizes, shapes, and numbers

High-Resolution Through-the-Wall Radar Imaging with Exploitation of Target Structure

It is quite challenging for through-the-wall radar imaging (TWRI) to achieve high-resolution ghost-free imaging with limited measurements in an indoor multipath scenario. In this paper, a novel high-resolution TWRI algorithm with the exploitation of the target clustered structure in a hierarchical Bayesian framework is proposed. More specifically, an extended spike-and-slab clustered prior is imposed to statistically encourage the cluster formations in both downrange and crossrange domains of the target region, and a generative model of the proposed approach is provided. Then, a Markov Chain Monte Carol (MCMC) sampler is used to implement the posterior inference. Compared to other state-of-the-art algorithms, the proposed nonparametric Bayesian algorithm can preserve underlying target clustered properties and effectively suppress these isolated spurious scatterers without any prior information on targets themselves, such as sizes, shapes, and numbers

Determining tension parameters in rational gamma-spline interpolation

Inspired by the classic gamma-spline, we propose a method for constructing a G(2) rational gamma-spline curve that interpolates a given set of distinct ordered data-points (planar or spatial). The only input of our method is just these data-points. We also present a procedure to solve the key problem of determining the tension parameters gamma(i) which are computed in terms of exponential functions that determine the eccentricities of the common conic osculants at the junction points while keeping in geometrical agreement with data-points. This allows the resulting curve to be modified in the close vicinity of each data-point. (C) 2010 Elsevier Inc. All rights reserved.Xu C, 2010, COMPUT AIDED GEOM D, V27, P458, DOI 10.1016/j.cagd.2010.04.001FARIN G, 2002, CURVES SURFACES CAGDWOLTERS HJ, 2002, HDB COMPUTER AIDED G, P111Ma W, 1998, INT J ADV MANUF TECH, V14, P918Wang XF, 1997, COMPUT AIDED DESIGN, V29, P485PIEGL LA, 1997, NURBS BOOKMA W, 1995, MATH METHODS CURVES, P315MA W, 1994, CURVES SURFACES GEOM, P319FARIN G, 1992, IEEE COMPUT GRAPH, V12, P78, DOI 10.1109/38.156017FARIN G, 1992, COMMUNICATIONSCHNEIDER FJ, 1992, THESIS TH DARMSTADTCHENG F, 1991, COMPUT AIDED DESIGN, V23, P700FARIN G, 1990, COMPUT AIDED GEOM D, V7, P533GREGORY JA, 1990, COMPUT AIDED GEOM D, V7, P1LEE ETY, 1989, COMPUT AIDED DESIGN, V21, P363BARSKY BJ, 1988, COMPUTER GRAPHICS GEPIEGL L, 1987, IEEE COMPUT GRAPH, V7, P45BOEHM W, 1987, COMPUT AIDED GEOM D, V4, P67NIELSON GM, 1986, IEEE COMPUT GRAPH, V6, P35BOEHM W, 1985, COMPUT AIDED GEOM D, V2, P313PRATT V, 1985, COMPUT GRAPH, V19, P151BARSKY B, 1983, SIGGRAPH 83, P193FARIN G, 1982, COMPUT AIDED DESIGN, V14, P137BARSKY BA, 1981, THESISNIELSON GM, 1974, COMPUT AIDED GEOM D, P209

Localized Delay-bounded and Energy-efficient Data Aggregation in Wireless Sensor and Actor Networks

International audienc

Straightforward coordination-driven supramolecular chemistry preparation of a discrete solid-state luminescent Cu4 polymetallic compact assembly based on conformationally flexible building blocks

International audienceThe ditopic nitrile-capped 1,4-phenylenediacetonitrile linker L3 featuring partial conformational flexibility was reacted with a flexible pre-assembled Cu(I) dimer stabilized by the bis(diphenyl-phosphino)methane dppm ligand along adaptive coordination-driven supramolecular assembling processes. It resulted in the selective and unexpected formation of a compact tetrametallic assembly associating two bimetallic building blocks with three ditopic linkers. The solid-state photophysical studies of this original Cu(I)-based assembly were analysed and showed its attractive luminescence properties