This article examines the design, manufacture, and performance of multi-magnetron ovens capable of reaching high temperatures. Firstly, an appropriate waveguide was simulated, and the production process was completed. Then, the proposed designs for multi-magnetron ovens were simulated, and appropriate dimensions were suggested. It was reported that the average power density (PD) value of the produced multi-magnetron oven was 0.37 mW/cm², which indicates its performance and efficiency. This value was found to be compliant with standards and safe for human use. The main objective of our study was to demonstrate that waveguides can reach high temperatures at the center of the oven without affecting each other. In this context, it was observed that the temperature created by magnetrons operating in single, double, triple, and quadruple modes gradually increased at the center of the oven. The simulation results supporting this showed that the S21 parameter was -177 dB. The design proposed and applied in our study was efficient, easy to produce, safe for human use, low cost, and usable in commercial and academic studies for reaching high temperatures. Overall, the multi-magnetron oven design proved to be a successful and practical solution for applications requiring high temperatures, showcasing its potential for both industrial and research purposes. The findings of this study contribute valuable insights into the development of advanced heating technologies, demonstrating significant improvements in efficiency and safety for high-temperature applications.

Burada, geniş bant yansıtıcı doğrusal polarizasyon (LP) ve dairesel polarizasyon (CP) dönüşümlerini gerçekleştirmek için tek katmanlı, ultra ince, çok işlevli ve yüksek verimli bir meta-yüzey sunulmaktadır. Önerilen meta-yüzey, %97'den fazla verimlilikle %55,2'lik (7,89 13,91 GHz) nispi absorpsiyon bant genişliği (RAB) üzerinde doğrusal polarize dalga için mükemmel bir çapraz polarizasyon dönüştürücü görevi görür. Doğrusal polarize dalgaları 7,2–7,36 GHz frekans aralığında başarıyla dairesel polarize dalgalara dönüştürür. Ek olarak, TE ve TM modları için polarizasyon dönüşüm oranı (PCR) verimlilik özellikleri, 450'ye kadar geniş bir geliş açısı ile tüm X bandında korunur. Sunulan polarizasyon dönüştürücü, 0.07λ0 kalınlık ile ultra ince bir özelliğe sahiptir. Kompakt boyutu, açısal kararlılığı, yüksek verimliliği, basit yapısı ve çok işlevliliği nedeniyle bu polarizasyon dönüştürücü, birçok uygulamada polarizasyon manipülasyonu ve iletişim cihazları için önemli bir adaydır.

Kısa devre kafesli rotorlu asenkron motorlar yapımı kolay, dayanıklı, işletme güvenliği yüksek, bakım ihtiyacı az ve muadillerine göre ucuz olduklarından sanayide ve birçok alanda yaygın olarak kullanılmaktadırlar. Bu çalışmada, 3 fazlı, 600 kW aktif gücünde, şebeke gerilimi 400 V, çalışma frekansı 50 Hz, kutup çifti 2, kutup sayısı 4, verimi 0.95 ve güç faktörü 0.93 olan kısa devre kafesli rotorlu asenkron motor tasarımı, fiziksel boyutlandırılması ve elektriksel hesaplamaları ile yapılmıştır. Öncelikli olarak tanımlanan tasarım kriterleri ve performans değerlerine bağlı olarak motorun ana boyutları, daha sonra stator ve rotorun fiziksel boyutlandırılması ve elektriksel hesaplamaları, endüksiyonlar ve magnetik alan şiddetleri, stator ve rotor ağırlıkları, kayıplar ve verim hesaplanmıştır. Yapılan analiz sonuçları, tasarlanan asenkron motorun istenen güç değerlerini ve tasarım performans kriterlerini sağladığını göstermiştir.

The aim of this study is focused on an excellent electromagnetic absorption response for radar applications by proposing an insensitive to incidence angle, ultra-thin, super broadband, and high efficiency metasurface. Achieving qualified absorption from low to high frequency is challenging due to impedance matching requirements in the structure. Herein, the proposed structure achieves a wide absorption bandwidth (over 90% absorptivity) from 2.4 GHz to 300 GHz. Moreover , the absorption efficiency of electromagnetic waves reaches (99%) from 4 GHz to 300 GHz. For transverse electric (TE) and transverse magnetic (TM) modes, the proposed structure behaves the same up to 45° when exposed to oblique incidences. The total thickness of the designed absorber is 3.6 mm, corresponding to 0.03λ0 at the lowest operating frequency. In addition, the proposed absorber is 1 compared with previous reports of radar bands. It is observed that it offers superior practical feasibility and is a promising candidate for S, C, X, Ku, K, Ka, V, W, and millimeter band radar applications.

Early and accurate cancer diagnosis remains a critical challenge in clinical oncology due to the limitations of traditional, destructive labeling methods. To address this gap, this study proposes a novel, label-free quad-band terahertz (THz) metamaterial biosensor designed for high-precision fingerprint identification of cancer cell lines. Utilizing a classic tri-layer sandwich architecture with a top patterned geometry of dual rings, numerical simulations were systematically performed via CST Studio Suite 2024 to evaluate the sensor’s electromagnetic performance. The proposed sensor established four distinct resonance channels at 2.274, 2.349, 2.552, and 2.615 THz, achieving ultra-deep absorption profiles down to −40.36 dB. When numerically investigated against six distinct biological lineages (Basal, HeLa, Jurkat, MCF-7, MDA-MB-231, and PC-12), the sensor successfully converted minor intracellular refractive index fluctuations into highly resolved, non-overlapping spectral displacements. Performance evaluations revealed an exceptional maximum optical sensitivity of 9642.8 GHz/RIU alongside a monumental Figure of Merit (FOM) of 1928.56 RIU⁻¹ for breast cancer cells (MCF-7), while demonstrating a peak Quality factor (Q-factor) of 870.33 for leukemia cells (Jurkat) and a high sensitivity of 6600.0 GHz/RIU for skin cancer cells (Basal). Ultimately, these decoupled multi-channel fingerprint outputs provide strong diagnostic redundancy, confirming the designed metamaterial absorber as a highly promising tool for next-generation, non-invasive early cancer diagnostic applications.