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SYMMETRIES OF PARTIAL DIFFERENTIAL EQUATIONS
Gaussier, Herve,Merker, Joel Korean Mathematical Society 2003 대한수학회지 Vol.40 No.3
We establish a link between the study of completely integrable systems of partial differential equations and the study of generic submanifolds in $\mathbb{C}$. Using the recent developments of Cauchy-Riemann geometry we provide the set of symmetries of such a system with a Lie group structure. Finally we determine the precise upper bound of the dimension of this Lie group for some specific systems of partial differential equations.
Automated CFD analysis for multiple directions of wind flow over terrain
Morvan, Herve P.,Stangroom, Paul,Wright, Nigel G. Techno-Press 2007 Wind and Structures, An International Journal (WAS Vol.10 No.2
Estimations of wind flow over terrain are often needed for applications such as pollutant dispersion, transport safety or wind farm location. Whilst field studies offer very detailed information regarding the wind potential over a small region, the cost of instrumenting a natural fetch alone is prohibitive. Wind tunnels offer one alternative although wind tunnel simulations can suffer from scale effects and high costs as well. Computational Fluid Dynamics (CFD) offers a second alternative which is increasingly seen as a viable one by wind engineers. There are two issues associated with CFD however, that of accuracy of the predictions and set-up and simulation times. This paper aims to address the two issues by demonstrating, by way of an investigation of wind potential for the Askervein Hill, that a good level of accuracy can be obtained with CFD (10% for the speed up ratio) and that it is possible to automate the simulations in order to compute a full wind rose efficiently. The paper shows how a combination of script and session files can be written to drive and automate CFD simulations based on commercial software. It proposes a general methodology for the automation of CFD applied to the computation of wind flow over a region of interest.
( Nkoa Omgba Herve Michel ),( Seong-gu Hong ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-
The introduction of non-edible plants into the production process of renewable energies, including for the synthesis of methane, is currently receiving a lot of attention. Eichhornia crassipes, also called water hyacinth is a floating and perennial aquatic monocotyledon from the family of Pontederiaceae, well adapted to the growth in the tropical and warm area. Various acid pretreatments were tested in 100 ml batch reactors at 35°C to compare methane production from Water hyacinth. Fresh hyacinths were taken and dried in a 50°C oven for 48 hours. They were then crushed by hand and finely grinded and sieved with two sieves with respective mesh of 2.36 mm and 4.25 μm. The treatments were performed with the intermediate fraction. The sulfuric acid doses used for pretreatment were 0.1%, 1%, 1.5% and compared with an acid-free control, each of these treatments was carried out in triplet. After pretreatment of 24H, sulfuric acid H2SO4 was neutralized with 10%sodium hydroxide buffer solution. The composition of the reaction mixture was 0.2 g of substrate + 20ml of acid diluted in distilled water + 30 ml of inoculum of methanogenic bacteria + 5ml of NaOH + 5ml of H2O, a total of 60 ml to which 0.03g is added Na2CO3. The mixture was incubated in an incubator at 35°C temperature for 30days. The methane production observed on the basis of methanogenic bacteria incubated for 7 days reveals the presence of a gas consisting of a mixture of CO2 and CH4, the volumes of which are respectively 119 ml, 192 ml and 163 ml for the 3 samples. Since the experiment is ongoing and incomplete, the results obtained do not yet allow us to judge whether the production of methane from hyacinth samples has been improved when sulfuric acid is applied as acid pretreatment.
( George A. Brooks ),( Herve Dubouchaud ),( Marcia Brown ),( James P. Sicurello ),( C. Eric Butz ) 한국스포츠정책과학원(구 한국스포츠개발원) 1999 International Journal of Applied Sports Sciences Vol.11 No.1
To evaluate the potential role of mitochondrial lactate dehydrogenase (LDH) in tissue lactate clearance and oxidation in vivo, isolated rat liver, cardiac, and skeletal muscle mitochondria were incubated with lactate, pyruvate, glutamate, and succinate. As well, a-cyano-4-hydroxycin-namate (CINN), a known monocarboxylate transport inhibitor, and oxamate, a known LDH inhibitor were used. Mitochondria readily oxidized pyruvate and lactate, with similar state 3 and 4 respiratory rates, respiratory control (state 3ystate 4), and ADPyO ratios. With lactate or pyruvate as substrates, a-cyano-4-hydroxycinnamate blocked the respira-tory response to added ADP, but the block was bypassed by addition of glutamate (complex I-linked) and succinate (complex 11 linked) substrates. Oxamate increased pyruvate (`10-40%), but blocked lanctate oxidation. Gel electrophoresis and electron microscopy indicated LDH isoenzyme distribution patterns to display tissue specificity, but the LDH isoenzyme patterns in isolated mitochondria were distinct from those in surrounding cell compartments. In heart, LDH-1 (H4) was concentrated in mitochondria whereas LDH-5 (M4) was present in both mitochondria and surrounding cytosol and organelles. LDH-5 predominated in liver but was more abundant in mitochondria than elsewhere. Because lactate exceeds cytosolic pyruvate concentration by an order of magnitude, we conclude that lactate is the predominant monocarboxylate oxidized by mitochondria in vivo. Mammalian liver and striated muscle mitochondria can oxidize exogenous lactate because of an internal LDH pool that facilitates lactate oxidation.
The Role of a Wiring Model in Switching Cell Transients
Atef Jedidi,Hatem Garrab,Herve Morel,Kamel Besbes 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
Power converter design requires simulation accuracy. In addition to the requirement of accurate models of power semiconductor devices, this paper highlights the role of considering a very good description of the converter circuit layout for an accurate simulation of its electrical behavior. This paper considers a simple experimental circuit including one switching cell where a MOSFET transistor controls the diode under test. The turn-off transients of the diode are captured, over which the circuit wiring has a major influence. This paper investigates the necessity for accurate modeling of the experimental test circuit wiring and the MOSFET transistor. It shows that a simple wiring inductance as the circuit wiring representation is insufficient. An adequate model and identification of the model parameters are then discussed. Results are validated through experimental and simulation results.
Denoel, Vincent,Degee, Herve Techno-Press 2006 Wind and Structures, An International Journal (WAS Vol.9 No.6
This paper is devoted to the non linear quasi-steady aerodynamic loading. A linear approximation is often used to compute the response of structures to buffeting forces. Some researchers have however shown that it is possible to account for the non linearity of this loading. This non linearity can come (i) from the squared velocity or (ii) from the shape of the aerodynamic coefficients (as functions of the wind angle of attack). In this paper, it is shown that this second origin can have significant implications on the design of the structure, particularly when the non linearity of the aerodynamic coefficient is important or when the transverse turbulence is important.
ZOUNEME, Boris Stephane,ADEPO, Joel,DIEDIE, Herve Gokou,OUMTANAGA, Souleymane International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.3
In recent decades, the heterogeneous and dynamic behavior of Internet traffic has placed new demands on the adaptive resource allocation of the optical network infrastructure. However, the advent of multifiber elastic optical networks has led to a higher degree of spectrum fragmentation than conventional flexible grid networks due to the dynamic and random establishment and removal of optical connections. In this paper, we propose heuristic routing and dynamic slot allocation algorithms to minimize spectrum fragmentation and reduce the probability of blocking future connection requests by considering the power consumption in elastic multifiber elastic optical networks.