Państwa i narody pogranicza. Charakterystyka geopolityczna ziem i społeczeństw północno-wschodniej Europy w pracach Voltaire’a Histoire de Charles XII, roi de Suède i Montesquieu De l'esprit des lois

Zadanie pt. Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej naukę

Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot

Scaling laws and universality play an important role in our understanding of critical phenomena and the Kondo effect. Here we present measurements of non-equilibrium transport through a single-channel Kondo quantum dot at low temperature and bias. We find that the low-energy Kondo conductance is consistent with universality between temperature and bias and characterized by a quadratic scaling exponent, as expected for the spin-1/2 Kondo effect. The non-equilibrium Kondo transport measurements are well-described by a universal scaling function with two scaling parameters.Comment: v2: improved introduction and theory-experiment comparsio

Simulation-Based Cost Accounting In Production And Logistics

Simulation tools have long been employed to enhance the technical efficiency of systems and processes in production and logistics. Traditionally focused on investigating and optimizing technical-logistical parameters such as facility output, lead times, and inventory levels, these studies often neglect the crucial economic perspective. While optimizing for temporal and quantitative objectives may yield an efficient system, it may not necessarily represent the most economically viable solution. A frequent gap in this phase is the consideration of economic aspects, which ultimately play a decisive role in operations. To holistically capture the economic landscape of production activities, simulation tools require cost data integration. Linking traditional simulation methods with cost accounting or investment analysis systems could facilitate a comprehensive evaluation and design of systems. In addressing this gap, the authors developed a comprehensive cost module within the Plant Simulation software for a project in the aviation industry. This module operates based on cost accounting principles, providing a framework for cost allocation by incorporating cost types, cost centers and cost units. The motivation behind this development stems from the aviation industry's need to increasingly automate assembly systems despite relatively lower production volumes compared to other industries. Beyond technical-logistical parameters, the authors consider monetary targets e.g. unit costs and optimize simulation results to assess the economic automation level. The integrated module continuously derives, calculates, and evaluates cost data based on the technical-logistical parameters identified during the simulation. This approach expands simulation models to include cost-specific parameters, allowing for a more comprehensive understanding of the economic implications of system design and automation

Engineering the Kondo and Fano effects in double quantum dots

We demonstrate delicate control over the Kondo effect and its interplay with quantum interference in an Aharonov-Bohm interferometer containing one Kondo dot and one noninteracting dot. It is shown that the Kondo resonance undergoes a dramatic evolution as the interdot tunnel coupling progressively increases. A novel triple Kondo splitting occurs from the interference between constant and Lorentzian conduction bands that cooperate in forming the Kondo singlet. The device also manifests a highly controllable Fano-Kondo effect in coherent electronic transport, and can be tuned to a regime where the coupled dots behave as decoupled dots.Comment: 5 pages, 4 figure

Non-equilibrium transport theory of the singlet-triplet transition: perturbative approach

We use a simple iterative perturbation theory to study the singlet-triplet (ST) transition in lateral and vertical quantum dots, modeled by the non-equilibrium two-level Anderson model. To a great surprise, the region of stable perturbation theory extends to relatively strong interactions, and this simple approach is able to reproduce all experimentally-observed features of the ST transition, including the formation of a dip in the differential conductance of a lateral dot indicative of the two-stage Kondo effect, or the maximum in the linear conductance around the transition point. Choosing the right starting point to the perturbation theory is, however, crucial to obtain reliable and meaningful results

Persistent currents through a quantum impurity: Protection through integrability

We consider an integrable model of a one-dimensional mesoscopic ring with the conduction electrons coupled by a spin exchange to a magnetic impurity. A symmetry analysis based on a Bethe Ansatz solution of the model reveals that the current is insensitive to the presence of the impurity. We argue that this is true for any integrable impurity-electron interaction, independent of choice of physical parameters or couplings. We propose a simple physical picture of how the persistent current gets protected by integrability.Comment: 5 pages, minor update