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Carbon‐Based Radar Absorbing Materials toward Stealth Technologies
Stealth technology is used to enhance the survival of military equipment in the field of military surveillance, as it utilizes a combination of techniques to render itself undetectable by enemy radar systems. Radar absorbing materials (RAMs) are specialized materials used to reduce the reflection (or absorption) of radar signals to provide stealth capability, which is a core component of passive countermeasures in military applications. The properties of RAMs can be optimized by adjusting their composition, microstructure, and surface geometry. Carbon‐based materials present a promising approach for the fabrication of ultrathin, versatile, and high‐performance RAMs due to their large specific surface area, lightweight, excellent dielectric properties, high electrical conductivity, and stability under harsh conditions. This review begins with a brief history of stealth technology and an introduction to electromagnetic waves, radar systems, and radar absorbing materials. This is followed by a discussion of recent research progress in carbon‐based RAMs, including carbon blacks, carbon fibers, carbon nanotubes, graphite, graphene, and MXene, along with an in‐depth examination of the principles and strategies on electromagnetic attenuation characteristics. Hope this review will offer fresh perspectives on the design and fabrication of carbon‐based RAMs, thereby fostering a deeper fundamental understanding and promoting practical applications.
Journal Article
RAMS/LCC Anforderungen im IRIS Standard - Herausforderung für Unternehmen aus der Schienenfahrzeugindustrie
Um eine Teilhabe am internationalen Markt zu garantieren bzw. zu ermöglichen ist auch für Unternehmen aus dem Schienensektor ein funktionierendes Qualitätsmanagementsystem von Nöten. Zuspruch fand hierfür vor allem der Branchenstandard IRIS, welches im Jahre 2006 erstmals in Anwendung kam und mittlerweile auch 13 Unternehmen aus der Türkei ein Zertifikat besitzen. Der Trend ist steigend. In vielerlei Hinsicht scheint dieser Standard den Wünschen der Unternehmungen gerecht zu werden, doch auch Unmutstöne sind von einigen zuhören, die besonders auf die geringen Kenntnisse und Erfahrung der einzelnen Klienten zurückzuführen sind. Anzuführen ist auch die Tatsache, dass IRIS ein erst recht neuer Standard ist und deshalb auch je nach Schwierigkeiten und Wünschen des Klientels nach oben hin Aufbaufähig ist. Schwierigkeiten seitens der Befragten Unternehmen sind vor allem im Bereich des RAMS/LCC Management zu hören, die einige Firmen überfordern. In dieser Arbeit wird auch genauer auf dieses eingegangen und genauer aus der Sicht der Unternehmen betrachtet.
Journal Article
Photo-Attractions
In Spring 1938, an Indian dancer named Ram Gopal and an American writer-photographer named Carl Van Vechten came together for a photoshoot in New York City. Ram Gopal was a pioneer of classical Indian dance and Van Vechten was reputed as a prominent white patron of the African-American movement called the Harlem Renaissance. Photo-Attractions describes the interpersonal desires and expectations of the two men that took shape when the dancer took pose in exotic costumes in front of Van Vechten's Leica camera. The spectacular images provide a rare and compelling record of an underrepresented history of transcultural exchanges during the interwar years of early-20th century, made briefly visible through photography.
Art historian Ajay Sinha uses these hitherto unpublished photographs and archival research to raise provocative and important questions about photographic technology, colonial histories, race, sexuality and transcultural desires. Challenging the assumption that Gopal was merely objectified by Van Vechten's Orientalist gaze, he explores the ways in which the Indian dancer co-authored the photos. In Sinha's reading, Van Vechten's New York studio becomes a promiscuous contact zone between world cultures, where a \"photo-erotic\" triangle is formed between the American photographer, Indian dancer, and German camera.
A groundbreaking study of global modernity, Photo-Attractions brings scholarship on American photography, literature, race and sexual economies into conversation with work on South Asian visual culture, dance, and gender. In these remarkable historical documents, it locates the pleasure taken in cultural difference that still resonates today.
eBook
Comprehensive Study of Security and Privacy of Emerging Non-Volatile Memories
Several promising non-volatile memories (NVMs) such as magnetic RAM (MRAM), spin-transfer torque RAM (STTRAM), ferroelectric RAM (FeRAM), resistive RAM (RRAM), and phase-change memory (PCM) are being investigated to keep the static leakage within a tolerable limit. These new technologies offer high density and consume zero leakage power and can bridge the gap between processor and memory. The desirable properties of emerging NVMs make them suitable candidates for several applications including replacement of conventional memories. However, their unique characteristics introduce new data privacy and security issues. Some of them are already available in the market as discrete chips or a part of full system implementation. They are considered to become ubiquitous in future computing devices. Therefore, it is important to ensure their security/privacy issues. Note that these NVMs can be considered for cache, main memory, or storage application. They are also suitable to implement in-memory computation which increases system throughput and eliminates von Neumann bottleneck. Compute-capable NVMs impose new security and privacy challenges that are fundamentally different than their storage counterpart. This work identifies NVM vulnerabilities and attack vectors originating from the device level all the way to circuits and systems, considering both storage and compute applications. We also summarize the circuit/system-level countermeasures to make the NVMs robust against security and privacy issues.
Journal Article
Selection of quantitative traits when crossing thin fine-coarse wool sheep with Tsigai breed rams
It is shown, that uncontrolled mass crossing of sheep with homogeneous wool led to a sharp deterioration in the quality of wool and the appearance in herds of a large number of fine- wool-coarse-wool hybrids not suitable for breeding. The experience of work on the restoration of fine-fleece and semi-fine fleece herds from such crosses is reported. The research on the dynamics of productivity and quantitative useful traits during the transformation of hybrid sheep into Tsigai is presented. The correlation dependence between the quantitative traits and the coefficients of heritability of the quantitative traits of Tsigai and crossbred sheep, as well as the variability of the quantitative traits of these sheep are shown. With the absorption of Tsigai by rams of fine-coarse-wool hybrids for one and a half intervals between generations, it is possible to increase the proportion of half-fine wool in a flock of sheep by 3-4 times.
Journal Article
Reliability and Maintenance Analysis of Unmanned Aerial Vehicles
This paper focuses on the development of a new logistic approach based on reliability and maintenance assessment, with the final aim of establishing a more efficient interval for the maintenance activities for Unmanned Aerial Vehicles (UAV). In the first part, we develop an architectural philosophy to obtain a more detailed reliability evaluation; then, we study the intrinsic reliability at the design stage in order to avoid severe critical issues in the UAV. In the second part, we compare different maintenance philosophies for UAVs and develop the concepts of preventive and corrective maintenance that consider the system subjected (until real “hard failure”) to partial performance degradation (“soft failure”). Finally, by evaluation of the uncertainty through the confidence interval, we determine the new soft failure limits, taking into account the general knowledge of the systems and subsystems in order to guarantee the proper preventive maintenance interval.
Journal Article
Novel missense variant L46Q of fatty acid synthase gene and fatty acids content in Awassi sheep
This study was conducted to investigate the association between the polymorphism of the FASN gene with fatty acid content in Awassi sheep. A total of 100 male Awassi sheep between the ages of one and two and a half years old were used in this study. Phenotypic measurement was recorded at slaughter, and from each animal, the longissimus dorsi (LD) muscle samples were taken to analyze the fatty acid profile. Genotyping, sequencing reactions, and in silico tools were performed to confirm the variants in amplified fragments. The result of genotyping revealed two genotypes (AA and AB) of the ovine FASN gene (exon 3). Novel SNP (L46Q) was discovered only within the FASN gene (AB genotype). All utilized in silico tools revealed remarkably deleterious effects for the L46Q on the mutant protein structure, function, and stability. Association analysis revealed that the AB genotype has significantly (p < 0.05) higher levels of animal length and monounsaturated fatty acids (MUFA) with lower amounts of saturated fatty acids (SFA) content than the AA genotype. In conclusion, novel SNP (L46Q) was discovered within the FASN gene (AB genotype), made the animals that has the AB genotype associated with good meat quality traits and this polymorphism may serve as markers for meat quality. Keywords: fatty acids composition; FASN gene; meat quality; rams.
Journal Article
Remote sensing and modelling analysis of the extreme dust storm hitting the Middle East and eastern Mediterranean in September 2015
The extreme dust storm that affected the Middle East and the eastern Mediterranean in September 2015 resulted in record-breaking dust loads over Cyprus with aerosol optical depth exceeding 5.0 at 550 nm. We analyse this event using profiles from the European Aerosol Research Lidar Network (EARLINET) and the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), geostationary observations from the Meteosat Second Generation (MSG) Spinning Enhanced Visible and Infrared Imager (SEVIRI), and high-resolution simulations from the Regional Atmospheric Modeling System (RAMS). The analysis of modelling and remote sensing data reveals the main mechanisms that resulted in the generation and persistence of the dust cloud over the Middle East and Cyprus. A combination of meteorological and surface processes is found, including (a) the development of a thermal low in the area of Syria that results in unstable atmospheric conditions and dust mobilization in this area, (b) the convective activity over northern Iraq that triggers the formation of westward-moving haboobs that merge with the previously elevated dust layer, and (c) the changes in land use due to war in the areas of northern Iraq and Syria that enhance dust erodibility.
Journal Article
