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Arnold Bode ist der Kunstwelt als geistiger Vater und Initiator der documenta Kunstausstellung bekannt, die seit 1955 in Kassel stattfindet. Weniger bekannt ist sein privates Leben, seine Arbeit als Künstler und Designer, als Innenraumgestalter und Städtebauvisionär. Geboren 1900, hatte er nach einem Studium der Kunst in Kassel erste Erfolge als Maler und Kurator. Sein beruflicher Einstieg 1930 am Werklehrerseminar in Berlin endete aber bald mit einem Berufsverbot im Nationalsozialismus. Mit Hilfe der Familie schlug er sich mit Innenausbau durch. Nach dem zweiten Weltkrieg konnte er im Messebau beachtliche Erfolge nachweisen. Er war Mitbegründer der 1947 neu gegründeten Werkakademie. Dort war er zuerst Dozent für Malerei, 1963-1969 Professor. Sein weiteres Leben war von der 1955 gegründete documenta geprägt, die ihn bis zu seinem Lebensende beschäftigte.0Sylvia Stöbe hat die Erinnerungen von noch lebenden Familienmitgliedern, Zeitzeugen und Informationen aus anderen Quellen zusammengetragen und eine Biografie von Arnold Bode erstellt.

   Owing to the energy crisis and environmental pollution deterioration, people are working to develop new kinds of electrical energy storage systems. Bimetallic oxides have been considered potential candidates for supercapacitors (SCs) due to their relatively high electric conductivity and abundant redox reactions. Herein, we designed and synthesized nanostructured Ag 2 Mo 2 O 7 by the simple chemical route and further examined the sample with different kinds of spectral and analytical tools. The Fourier Transform Infrared Spectroscopy (FTIR) studies analyzed the different vibration and starching modes of metal oxide and the pure phase of the obtained Ag 2 Mo 2 O 7 . The morphology nature of nanoflakes Ag 2 Mo 2 O 7 can be easily identified from field emission scanning electron microscopy (FE-SEM) can be observed. X-ray photon spectroscopy (XPS) studies the oxidation states of the Ag 3d, Mo 3d and O 1 s, which validates the XRD data. The as-prepared Ag 2 Mo 2 O 7 nanostructure was used as supercapacitor (SC) electrode material, and it exhibited pseudocapacitive performance with noticeable specific capacity ( C s ) of 430 C g −1 at 1 A g −1 and significant cycling stability of 93.7% capacitance retention with the coulombic efficiency of 85.2% even up to 5000 GCD cycles at 1 A g −1 . The morphological investigations indicated that the higher C s values were mainly caused by the significant increase in active sites as well as active surface area. The Bode phase angle plot of Ag 2 Mo 2 O 7 exhibited a low frequency intercept, with emphasis at approximately − 50.6° phase angle, which indicated a superior redox signature. The results infer that these highly electroactive binary metal oxide nanostructures are promising candidates for high performance energy storage applications.

Rate limit of system actuators is one of the major restrictions in the physical world. However, in classical and modern control design, the actuator rate limit has always been neglected. The rate limit generates amplitude attenuation and phase delay of the control signal, which will deteriorate closed-loop system performance, and may even lead to system instability. In this study, the Bode step control method was applied to the first-order plus time-delay system to achieve a better tolerance of smaller rate limit value. A rate limit compensation strategy is proposed based on the describing function and the onset frequency of the rate limiter. Both illustrative example and hardware-in-the-loop experiments are given to show the effectiveness of Bode step controller and the proposed rate limit compensation method.

Capacitive micromachined ultrasonic transducers (CMUTs) are a promising alternative to conventional piezoelectric transducers, offering superior design flexibility and broadband operational characteristics. However, their clinical and practical deployment is constrained by elevated driving voltages and limited acoustic power output, particularly when producing CMUTs based on polymers. This paper presents an end-to-end, measurement-driven experimental validation strategy for designing passive broadband impedance-matching networks that enhance transmitted acoustic power in immersed CMUT arrays while preserving bandwidth. Matching topologies are synthesized to operate near the theoretical Bode–Fano limit, and robustness to component tolerances is quantified through Monte Carlo yield analysis using realistic off-the-shelf component variations. The matching networks are then implemented and experimentally validated under representative unipolar pulse excitation, with far-field acoustic pressure characterized in both time and frequency domains and compared against numerical predictions. The results show that the optimized impedance matching increases transmit power by a factor of 2.1 at the cost of a 40% fractional-bandwidth reduction. These findings establish a directly applicable, validated framework for broadband impedance matching in polymer CMUT arrays and support its use as a cost-effective approach for ultrasound imaging and therapeutic systems.

In the current paper, ion transport parameters in poly (vinyl alcohol) (PVA) based solid polymer electrolyte were examined using Trukhan model successfully. The desired amount of lithium trifluoromethanesulfonate (LiCF3SO3) was dissolved in PVA host polymer to synthesis of solid polymer electrolytes (SPEs). Ion transport parameters such as mobility (μ), diffusion coefficient (D), and charge carrier number density (n) are investigated in detail using impedance spectroscopy. The data results from impedance plots illustrated a decrement of bulk resistance with an increase in temperature. Using electrical equivalent circuits (EEC), electrical impedance plots (ZivsZr) are fitted at various temperatures. The results of impedance study demonstrated that the resistivity of the sample decreases with increasing temperature. The decrease of resistance or impedance with increasing temperature distinguished from Bode plots. The dielectric constant and dielectric loss values increased with an increase in temperature. The loss tangent peaks shifted to higher frequency region and the intensity increased with an increase in temperature. In this contribution, ion transport as a complicated subject in polymer physics is studied. The conductivity versus reciprocal of temperature was found to obey Arrhenius behavior type. The ion transport mechanism is discussed from the tanδ spectra. The ion transport parameters at ambient temperature are found to be 9 × 10−8 cm2/s, 0.8 × 1017 cm−3, and 3 × 10−6 cm2/Vs for D, n, andμ respectively. All these parameters have shown increasing as temperature increased. The electric modulus parameters are studied in an attempt to understand the relaxation dynamics and to clarify the relaxation process and ion dynamics relationship.

In addition to their conventional use in electric motor drives, DC-DC converters have a variety of other uses, such as energy storage, energy conversion, cyber security systems, uninterruptible power supplies, and renewable energy systems. An innovative DC-DC converter is suggested in this article. Designing a new, high-gain DC-DC converter scheme known as a double-switch SEPIC-buck converter (DSSB) is possible after making some adjustments to the SEPIC converter that is currently known in accordance with accepted techniques. The output voltage magnitude of the proposed converter is either larger than or less than the input voltage magnitude and is the same sign as the input voltage. According to the theoretical and analytical study that has been supported by the real-world application, high voltage gain, low switching stress, and low inductor current ripple are the main characteristics of the proposed DSSB converter. The related small-signal model was also used to build the closed-loop system. The frequency response and output voltage behavior were investigated when the input source voltage abruptly changed as a step function. Based on the comparison study with other DC-DC converters, the DSSB converter outperforms currently known DC-DC converters such as Buck, SEPIC, Boost, Buck-Boost, and other SEPIC converter topologies in terms of voltage gain, harmonic content, normalized current ripple, dynamic performance, and efficiency. Additionally, the frequency response and control of the proposed converter using an alternate current (AC), small-signal, analysis-based, current-mode control technique are both provided. Thus, the DSSB is regarded as safe in overcurrent situations because of the small-signal analysis with the current control strategy. As a result of the verification of the proposed control technique, the resistance to changes in the DSSB parameters, improved dynamic performance, and higher control accuracy are further advantages of current-mode control based on small-signal analysis over other control approaches (PI controllers). Finally, the experimental and simulation results from Simplorer 7 and MATLAB/Simulink are used to validate the findings of the analytical and comparative investigation.

Concrete manufacturing makes a major contribution to the world economy, especially the construction industry, but it has a high level of CO 2 emissions, which harm the environment. To address this environmental issue, this paper investigates the possibility of utilizing a natural mineral that consists of iron, silica, and magnesium, and that is referred to as calcium carbonate, to partially substitute cement. This has been neglected material in past studies, even though it can be used to boost the process of hydration, chemical stability, and even be low in solubility in water. The study is exploring the characteristics of calcium carbonate (CaCO 3 )-modified concrete, such as its physical, rheological, and microstructural properties. CaCO 3 and ground granulated blast furnace slag were taken as a replacement of 5%, 10%, 15% and 20% of the cement by weight, with a constant water to cement ratio being 0.45, and 50% replacement of cement by ground granulated blast furnace slag (GGBS). The plots of Nyquist and Bode that the microstructural analysis of the changes in the concrete matrix. Non-destructive testing was used to test the performance of the concrete in the long term, quality, homogeneity, and the hardness of the surface. The findings revealed that CaCO 3 -modified concrete was better than traditional concrete, especially in its resistance to carbonation. It gave the best result with 15% cement replacement, where compressive strength was 71.1 MPa, split tensile strength was 4.72 MPa, and flexural strength was 5.89 MPa after 90 days. The results indicate that CaCO 3 can be an effective alternative to cement that can be used in the production of concrete.

An iterative tuning method for multi-band power system stabilizers is proposed, which utilizes the contoured controller Bode (CCBode) plot. The typical multi-band power system stabilizer, PSS4B, is conceptualized as a series connection of two filters: a band-pass filter and a phase compensator. The tuning process involves a space searching approach for the phase compensator to ensure its phase–frequency response remains within acceptable bounds. Subsequently, the CCBode plot is employed to adjust the magnitude–frequency response of the band-pass filter, thereby enhancing stability performance across a broad frequency range. The method proposed can be applied to the parameter design of the multi-band power system stabilizer PSS4B in the power system to suppress the low-frequency oscillations of the local mode and inter-regional mode in the system. The effectiveness of this proposed method is demonstrated through case studies of the four -machine/two-area system and the North China Power Grid.

Pole-zero maps and Bode plots are commonly utilized in control systems and the study of natural phenomena to visualize their origins and behavior. In this paper, these graphical methods are applied to investigate the behavior of cavity variations, ΔL, in a low-finesse Fabry–Pérot interferometer subjected to external perturbations. Both graphical representations are analyzed in the s-plane. The study is theoretically performed, and the theory is corroborated by developing three numerical experiments where small displacements were applied. Based on the theoretical and numerical results, the cavity length variations, ΔL, can be studied on the s-plane applying the pole-zero maps and Bode plots. The two methods, including the theory and the experiments, are in agreement. Considering the theoretical and graphical results, pole-zero maps and Bode plots can be applied on the signal demodulation of optical interferometers and quasi-distributed sensors where local sensors are interferometers.