Condensed Matter

2311 Submissions

[3] viXra:2311.0121 [pdf] submitted on 2023-11-24 23:46:03

Magneto-Structural Phase Transitions and Two-Dimensional Spin Waves in Graphite

Authors: Nadina Gheorghiu, Charles R. Ebbing, Timothy J. Haugan
Comments: 8 Pages.

We have previously found experimental evidence for several quantum phenomena in oxygen-ion implanted of hydrogenated graphite: ferromagnetism, antiferromagnetism, paramagentism, triplet superconductivity, Andreev states, Little-Parks oscillations, Lamb shift, Casimir effect, colossal magnetoresistance, and topologically-protected flat-energy bands [1-6]. Triplet superconductivity results in the formation of Josephson junctions, thus with potential of being used for spintronics applications in the critical area of quantum computing. In this paper, we are showing new experimental evidence for the formation of two-dimensional (2D) spin waves in oxygen-ion enriched and in hydrogenated highly oriented pyrolytic graphite. The temperature evolution of the remanent magnetization Mrem(T) data confirms the formation of spin waves that follow the 2D Heisenberg model with a weak uniaxial anisotropy. In addition, the step-like features also found in the temperature dependence of the electrical resistivity between insulating and metallic states suggest several outstanding possibilities, such as a structural transition, triplet superconductivity, and chiral properties.
Category: Condensed Matter

[2] viXra:2311.0101 [pdf] submitted on 2023-11-20 22:03:54

On Low Energy Nuclear Fusion Chain Reaction (LENR) as a Plausible New Source of Carbon-free Energy

Authors: A. P. Nikitin
Comments: 4 Pages.

In this paper, the author explores LENR as a plausible new source of carbon-free energy and a non-mechanical engine.
Category: Condensed Matter

[1] viXra:2311.0061 [pdf] submitted on 2023-11-10 07:18:20

Sidelobe Suppression of LFM Signal Using Variability Index (VI)-Wavelet Threshold Method

Authors: Choe Kwang Hyon, Choe Chol Jun, Ri Kwang Il
Comments: 14 Pages.

In the pulse compression radar using linear frequency modulation (LFM), the sidelobe suppression signal processing is very important to overcome an effect that may mask smaller targets or maybe mistaken as separate targets. This paper considers a novel framework of the sidelobe suppression for linear frequency modulation signal (LFM) at a receiver when existing internal receive noise. In pulse compression for LFM signal, there exist not only range mainlobe components but also range sidelobe components in the matched filter output. It is necessary to effectively suppress the sidelobe components at the receiver of radar. This paper presents variability index (VI)-threshold operation based on the wavelet transform to further reduce these range sidelobes, and then analyzes it compared to the conventional window method. The results show that the proposed method is very effective in suppression of sidelobes components for LFM signal. It also indicates that this method gives better a peak to sidelobe ratio (PSR) performance than other methods for the sidelobe suppression.
Category: Condensed Matter