Incorporation of active devices/media such as transistors for microwave and gain media for optics may be very attractive for enabling desired low loss and broadband metamaterials. Such metamaterials can even have gain which may very well lead to new and exciting physical phenomena. We investigate microwave composite right/left-handed transmission lines (CRLH-TL) incorporating ideal gain devices such as constant negative resistance. With realistic lumped element values, we have shown that the negative phase constant of this kind of transmission lines is maintained (i.e., left-handedness kept) while gain can be obtained (negative attenuation constant of transmission line) simultaneously. Possible implementation and challenging issues of the proposed active CRLH-TL are also discussed.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5448474 | PMC |
| http://dx.doi.org/10.3390/ma4010073 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Parallel EEG-fNIRS assessments of covert cognition in behaviorally non-responsive ICU patients: A multi-task feasibility study in a case of acute motor sensory axonal neuropathy.
J Neurol
January 2025
Western Institute of Neuroscience, Western University, London, Canada.
Background: Repeat neurological assessment is standard in cases of severe acute brain injury. However, conventional measures rely on overt behavior. Unfortunately, behavioral responses may be difficult or impossible for some patients.
View Article and Find Full Text PDFCombined Experimental and Theoretical Approach to the Electronic and Magnetic Properties of Cu-Doped LaMnO Perovskites.
J Phys Chem C Nanomater Interfaces
January 2025
Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck,Innrain 80-82, 6020 Innsbruck, Austria.
Cu-doped LaCu Mn O perovskites have been used as a model system for a joint experimental and theoretical assessment of the influence of the Cu doping level on the structural, electronic, and magnetic properties. The different Cu-doped phases LaCuMnO (LCM37), LaCuMnO (LCM55), and LaCuMnO (LCM73) including the respective Cu- and Mn-free benchmark materials LaCuO (LC) and LaMnO (LM) have been studied by magnetization measurements and electronic paramagnetic resonance. Ferromagnetic behavior was detected for pure LM and all Cu-doped perovskites, whereas antiferromagnetic behavior was revealed for LaCuO.
View Article and Find Full Text PDFData-integration with pseudoweights and survey-calibration: application to developing US-representative lung cancer risk models for use in screening.
J R Stat Soc Ser A Stat Soc
January 2025
Division of Cancer Epidemiology & Genetics, National Cancer Institute, Biostatistics Branch, Rockville, USA.
Accurate cancer risk estimation is crucial to clinical decision-making, such as identifying high-risk people for screening. However, most existing cancer risk models incorporate data from epidemiologic studies, which usually cannot represent the target population. While population-based health surveys are ideal for making inference to the target population, they typically do not collect time-to-cancer incidence data.
View Article and Find Full Text PDFRecent progress in the organoselenium-catalyzed difunctionalization of alkenes.
Org Biomol Chem
January 2025
School of Pharmacy, Nantong Key Laboratory of Small Molecular Drug Innovation and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, Nantong 226019, People's Republic of China.
Selenium-based catalysts have recently been utilized to facilitate a variety of new organic transformations, owing to their intrinsic advantages, including low cost, low toxicity, stability in both air and water, and strong compatibility with diverse functional groups. The difunctionalization of alkenes-the process of incorporating two functional groups onto a carbon-carbon double bond-has garnered particular interest within the chemical community owing to its significant applications in organic synthesis. Recently, organoselenium-catalyzed difunctionalization of alkenes has emerged as an ideal and powerful route to obtain high-value vicinal difunctionalized molecules.
View Article and Find Full Text PDFElectrospun Chitosan/Polylactic Acid Nanofibers with Silver Nanoparticles: Structure, Antibacterial, and Cytotoxic Properties.
ACS Appl Bio Mater
January 2025
Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania.
Electrospinning, a technique for creating fabric materials from polymer solutions, is widely used in various fields, including biomedicine. The unique properties of electrospun fibrous membranes, such as large surface area, compositional versatility, and customizable porous structure, make them ideal for advanced biomedical applications like tissue engineering and wound healing. By considering the high biocompatibility and well-known regenerative potential of polylactic acid (PLA) and chitosan (CH), as well as the versatile antibacterial effect of silver nanoparticles (AgNPs), this study explores the antibacterial efficacy, adhesive properties, and cytotoxicity of electrospun chitosan membranes with a unique nanofibrous structure and varying concentrations of AgNPs.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!