Gépkocsi kerékfelfüggesztések rezgési tulajdonságainak szimulációja és mérése

Személygépkocsik kerékfelfüggesztésének rezgési tulajdonságait vizsgáltam lengéscsillapító próbapadon méréssel, valamint számítógépes szimulációval. Sikerült olyan számítógépes modellt felépíteni, amely jó kvantitatív egyezést mutat a kísérleti eredményekkel

A new linear combination method of haplogroup distribution central vectors to model population admixtures

We introduce a novel population genetic approach suitable to model the origin and relationships of populations, using new computation methods analyzing Hg frequency distributions. Hgs were selected into groups which show correlated frequencies in subsets of populations, based on the assumption that correlations were established in ancient separation, migration and admixture processes. Populations are defined with this universal Hg database, then using unsupervised artificial intelligence, central vectors (CVs) are determined from local condensations of the Hg-distribution vectors in the multidimensional point system. Populations are clustered according to their proximity to CVs. We show that CVs can be regarded as approximations of ancient populations and real populations can be modeled as weighted linear combinations of the CVs using a new linear combination algorithm based on a gradient search for the weights. The efficacy of the method is demonstrated by comparing Copper Age populations of the Carpathian Basin to Middle Age ones and modern Hungarians. Our analysis reveals significant population continuity since the Middle Ages, and the presence of a substrate component since the Copper Age. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00438-022-01888-0

Elasto-mechanical properties of living cells

The possibility to directly measure the elasticity of living cell has emerged only in the last few decades. In the present study the elastic properties of two cell lines were followed. Both types are widely used as cell barrier models (e.g. blood-brain barrier). During time resolved measurement of the living cell elasticity a continuous quasi-periodic oscillation of the elastic modulus was observed. Fast Fourier transformation of the signals revealed that a very limited number of three to five Fourier terms fitted the signal in the case of human cerebral endothelial cells. In the case of canine kidney epithelial cells more than 8 Fourier terms did not result a good fit. Calculating the correlation between nucleus and periphery of the signals revealed a higher correlation factor for the endothelial cells compared to the epithelial cells

Reduction of intracellular oxidative stress with copper incorporated layered double hydroxide

Biocompatible Cu(II)-doped layered double hydroxide (CMA) nanoparticles were developed to combat reactive oxygen species. The 2-dimensional nanozymes showed both superoxide dismutase and catalase-like activity in chemical assays, while proved as..