Shadows over Shulamith: Giordano Bruno's De umbris idearum and the Song of Songs

This article focuses on the use of one verse from the Biblical Songs of Songs in central passages of Giordano Bruno's first published book on the art of memory. De umbris idearum [On the Shadows of Ideas] not solely aims at improving mnemonic capacities, it also envisages the preconditions and limits of cognition in Bruno's new inifitist cosmology. Taking relevant scholarly literature on the topic as a point of departure, this contribution presents De umbris in the context of Bruno's philosophy in general; it focuses on Bruno's evocation of Origen's commentary on that passage in the Song of Songs. The article analyzes in detail the reasons for Bruno's subversion of the traditional exegetic tradition that was massively influenced by Origen's spiritualized reading of the Song of Songs. Bruno's misappropriation of the Origen's commentary turns out to be a mise en abyme, a mannerist strategy of representation. It not only reflects the very method that underlies Bruno's art of memory, but is also to be understood as a conscious subversion of exegetic traditions in general

Adaptive antenna system by ESP32-PICO-D4 and its application to web radio system

Adaptive antenna technique has an important role in the IoT environment in order to establish reliable and stable wireless communication in high congestion situation. Even if knowing antenna characteristics in advance, electromagnetic wave propagation in the non-line-of-sight environment is very complex and unpredictable, therefore, the adjustment the antenna radiation for the optimum signal reception is important for the better wireless link. This article presents a simple but effective adaptive antenna system for Wi-Fi utilizing the function of a highly integrated component, ESP32-PICO-D4. This chip is a system-in-chip containing all components for Wi-Fi and Bluetooth application except for antenna. Together with SP3T RF switch and dielectric antennas and high-resolution audio DAC, completed web-radio system is made in the size of 50 x 50 mm.Comment: This article is submitted for Hardware

Neokeynesian and Neoclassical Macroeconomic Models: Stability and Lyapunov Experiments

The non-linear approach to economic dynamics enables us to study traditional economic models using modified formulations and different methods of solution. In this article we compare the dynamic properties of the Keynesian and Classical macroeconomic models. We start with an extended dynamic IS-LM neoclassical model generating the behavior of the real product, the interest rate, expected inflation, and the price level over time. Limiting behavior, stability, and the existence of limit cycles and other specific features of these models will be compared.macroeconomic models, Keynesian and Classical model, non-linear differential equations, linearization, asymptotical stability, Lyapunov exponents

Synthesis of strontium ferrite/iron oxide exchange coupled nano-powders with improved energy product for rare earth free permanent magnet applications

We present a simple, scalable synthesis route for producing exchange coupled soft/hard magnetic composite powder that outperforms pure soft and hard phase constituents. Importantly, the composites is iron oxide based (SrFe12O19 and Fe3O4) and contain no rare earth or precious metal. The two step synthesis process consists of first precipitating, an Iron oxide/hydroxide precursor directly on top of SrFe12O19 nano-flakes, ensuring a very fine degree of mixing between the hard and the soft magnetic phases. We then use a second step that serves to reduce the precursor to create the proper soft magnetic phase and create the intimate interface necessary for exchange coupling. We establish a clear processing window; at temperatures below this window the desired soft phase is not produced, while higher temperatures result in deleterious reaction at the soft/hard phase interfaces, causing an improper ratio of soft to hard phases. Improvements of Mr, Ms, and (BH)max are 42%, 29% and 37% respectively in the SrFe12O19/Fe3O4 composite compared to pure hard phase (SrFe12O19). We provide evidence of coupling (exchange spring behavior) with hysteresis curves, first order reversal curve (FORC) analysis and recoil measurements.Comment: in J. Mater. Chem. C, 201