Logistic growth in seasonally changing environments

We consider a parameter dependent periodic-logistic problem with a logistic term involving a degeneracy that replicates time dependent refuges in the habitat of a population. Working under no or very minimal assumptions on the boundary regularity of the domain we show the existence of a time-periodic solution which bifurcates with respect to the parameter and show their stability. We show that under suitable assumptions that the periodic solution blows up on part of the domain and remains finite on other parts when the parameter approaches a critical value.Comment: 33 pages, 2 figure

Asm international equity report: the industry as a double-edged sword

This work project studies ASM International’s business model and financial results and attempts to realistically forecast the results for the next 15 years in order to estimate its share price as of December 2023. The results suggest a BUY recommendation with a target price estimated at €315.28, representing a 22.58% overall gain in case the stock is purchased at the end of 2022 and held for a year

Periodic Solutions of the Generalised Logistic Equation

We study the periodic generalised logistic equation which is parameterised and includes a degenerate potential. Such an equation can be used to model a population density within a habitat that has refuges in which the population experiences no mortality. It is assumed that all parameters vary periodically - for example to take account for temperature changes of seasons. Under no assumption on the boundary of the domain, and the form of the degenerate potential, we show the existence of a periodic solution. It is necessary for the parameter to fall within a predetermined range for a periodic solution exist and so we are also able to examine properties of a family of periodic solutions, determined by the parameter range. We show that this family of periodic solutions bifurcate and under additional assumptions we are able to show they tend to a blow-up solution of an equivalent logistic equation. In contrast to the existing literature, we have greatly relaxed assumptions on the domain and the degenerate potential. Additionally, we explore how the parabolic maximum principle affects where periodic solutions remain bounded in the domain. We provide examples showing that the solutions remain bounded even in some places where the potential is zero, in contrast to the corresponding elliptic problem

Thermal Sensitivity Analysis of a High Power Density Electric Motor for Aeronautical Application

International audienceThis paper studies the sensitivity of the thermal behavior of a high power density electric motor to some parameters. The machine is conceived for aeronautical application. It is of Permanent Magnet Synchronous type totally enclosed, configured with a double cooling system around the stator and in the shaft. A Lumped Parameter Thermal Model of the motor is primarily elaborated to explore hot spot points. Then, the thermal parameters, related to the heat evacuation from the critical zones, are investigated. Windings' thermal conductivity as well as laminations' one appear to influence the most the hottest regions of the machine

Numerical Approach to Determining Windings' Thermal Conductivity

International audience Abstract-This study concerns the characterization of windings' thermal conductivity, which is of primordial importance for thermal management of a high power density electrical machine. Indeed, such machines exhibit high heat dissipation in the windings' area. A precise knowledge of this conductivity value is therefore important for good thermal predictions. Unfortunately, the heterogeneity of the windings and the heat production repartition make it difficult to calculate easily winding's equivalent thermal conductivity. The influence of four thermal and geometrical parameters on the windings' equivalent thermal conductivity is numerically studied on a Finite Element Analysis software, allowing determining more precisely this characteristic. The impregnation's thermal conductivity, the conductors' number, the fill factor and the configuration of the copper wires inside the slot are investigated. The equivalent thermal conductivity, principally controlled by the impregnation thermal conductivity, the slot fill factor and the conductors' disposition, is expressed in terms of the first two parameters in its worst-case configuration. Index Terms-Thermal management, windings, thermal conductivity, Finite Element Modeling (FEM

Eine C1-stetige Rekonstruktion der Randgeometrie für die Kontaktbehandlung mit der Finite Elemente Methode

[no abstract

Commentaires sous Trib. UE, 12 déc. 2015, SNCF c/ Commission, aff. T-242/12

peer reviewe

Pioniergeist, Ausdauer, Leidenschaft. Festschrift zu Ehren von Prof. Dr. Jürgen Handke

Diese Festschrift ist dem wissenschaftlichen Wirken von Prof. Dr. Jürgen Handke gewidmet und wurde anlässlich seiner Pensionierung im März 2020 zusammengestellt. Der Band behandelt eine Vielzahl an wissenschaftlichen Bereichen, dazu zählen die Linguistik, die digitale Lehre, der Inverted Classroom, das curriculare Design sowie die Educational Robotics. Zu den Beitragenden gehören namhafte Vertreter aus Wissenschaft und Wirtschaft sowie Jungwissenschaftler und Nachwuchsforscher mit Artikeln in sowohl deutscher als auch englischer Sprache. Darüber hinaus hat sich eine Gruppe Künstler mit dem „Forschungsgegenstand“ Jürgen Handke auf künstlerische Weise auseinandergesetzt

ConnectionWatch: Passive monitoring of round-trip times at end-hosts

International audienceThe current Internet offers a diverse set of applications for end-users (e.g., online gaming, IPTV, VoIP, VoD). These applications require a timely delivery of packets to avoid the deterioration of user-perceived performance. Slow web- browsing, momentarily drops of voice in Internet telephony and lagging remote connections are some of the most com- mon problems that affect the usability of Internet services. Ideally, if applications had access to measurements that quan- tify network performance, they could dynamically adapt to network conditions and improve user satisfaction. Most im- portantly, when application service quality falls below ex- pectations, online measurements help users understand who to blame and what to do to bypass the problem. We propose a troubleshooting tool that runs at end-hosts to automatically detect and diagnose performance degrada- tions. The tool has three aspects: detection of performance degradation, identification of the location of the problem and characterization of the potential causes. In this work, we focus on the detection aspect, which requires continuous monitoring at end-hosts

Unraveling the metabolic activities of bioactive compounds on cellular models of hepatosteatosis and adipogenesis through docking analysis with PPARs

Obesity is associated with fatty liver disease. Available therapies show modest efficacy, and nutraceuticals with good effectiveness and safety are largely investigated. We focused on five natural compounds, three plant phenolic compounds (carvacrol, rosmarinic acid, silybin), and two thyroid hormones (T2: 3,5-diiodo-l-thyronine; T3: 3,5,3’-triiodo-L-thyronine) as comparison, to assess their beneficial effects on two cellular models of hepatosteatosis and adipogenesis. All compounds ameliorated the lipid accumulation and oxidative stress in both models, but with different potencies. The peroxisome proliferator-activated receptors (PPARs) are pivotal controllers of adipogenesis and lipid metabolism. For the main isoforms, PPARγ and PPARa, we assessed their possible binding to the compounds by molecular docking calculations, and their expression pattern by real-time PCR. All compounds bind both PPARs with different affinity, while not all compounds affect their expression. The results may clarify the distinctive molecular mechanisms underlying the action of the five compounds in the different cell models with possible applications to treat obesity