Magnetocaloric effect in the high-temperature antiferromagnet YbCoC2

The magnetic $H$-$T$ phase diagram and magnetocaloric effect in the recently discovered high-temperature heavy-fermion compound YbCoC$_2$ have been studied. With the increase in the external magnetic field YbCoC$_2$ experiences the metamagnetic transition and then transition to the ferromagnetic state. The dependencies of magnetic entropy change -$\Delta S_m (T)$ have segments with positive and negative magnetocaloric effects for $\Delta H \leq 6$~T. For $\Delta H = 9$~T magnetocaloric effect becomes positive with a maximum value of -$\Delta S_m (T)$ is 4.1 J / kg K and a refrigerant capacity is 56.6 J / kg

Production of {\pi}+ and K+ mesons in argon-nucleus interactions at 3.2 AGeV

First physics results of the BM@N experiment at the Nuclotron/NICA complex are presented on {\pi}+ and K+ meson production in interactions of an argon beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 AGeV. Transverse momentum distributions, rapidity spectra and multiplicities of {\pi}+ and K+ mesons are measured. The results are compared with predictions of theoretical models and with other measurements at lower energies.Comment: 29 pages, 20 figure

Automatic Search for Differential Trails in ARX Ciphers

We propose a tool for automatic search for differential trails in ARX ciphers. By introducing the concept of a partial difference distribution table (pDDT) we extend Matsui's algorithm, originally proposed for DES-like ciphers, to the class of ARX ciphers. To the best of our knowledge this is the first application of Matsui's algorithm to ciphers that do not have S-boxes. The tool is applied to the block ciphers TEA, XTEA, SPECK and RAIDEN. For RAIDEN we find an iterative characteristic on all 32 rounds that can be used to break the full cipher using standard differential cryptanalysis. This is the first cryptanalysis of the cipher in a non-related key setting. Differential trails on 9, 10 and 13 rounds are found for SPECK32, SPECK48 and SPECK64 respectively. The 13 round trail covers half of the total number of rounds. These are the first public results on the security analysis of SPECK. For TEA multiple full (i.e. not truncated) differential trails are reported for the first time, while for XTEA we confirm the previous best known trail reported by Hong et al. We also show closed formulas for computing the exact additive differential probabilities of the left and right shift operations. The source code of the tool is publicly available as part of a larger toolkit for the analysis of ARX at the following address: https://github.com/vesselinux/yaarx

EFFECT OF VARIOUS TEMPERATURES IN THE ROOT ZONE AND LIGHT INTENSITIES ON PHOTOSYNTHESIS AND TRANSPIRATION OF TOMATO PLANTS

Photosynthetic intensity, transpiration and stomatal resistance (R_s) of tomato plant leaves were studied at various light intensities and temperatures in the root zone. Temperature regime had an insignificant effect on a gas exchange of plants at an irradiation of 900μmol m^<-2> s^<-1>. Less irradiation, 180μmol m^<-2> s^<-1>, resulted in a relatively greater effect of temperature on CO_2 uptake. Transpiration rate and stomatal resistance to CO_2 varied slightly within a wide range of temperature changes. An increase and decrease of R_s were observed only at low (<14) and high (>28℃) temperatures, respectively. Reverse dependence was found for the process of transpiration. The highest transpiration coefficient Ph/T was observed at 20℃. The results indicate that it is necessary to take all the aspects of plant activity into account for determining optimal growth conditions

Inductively coupled plasma atomic emission spectrometry -line selection and accuracy in the determination of platinum, palladium, rhodium, barium and lead in automotive catalytic converters

This work shows that by using ICP-AES and the Q-concept for quantification of spectral interferences in the determination of Pt, Pd, Rh, Pb and Ba in catalytic automotive converters with aluminum as matrix component, the errors in the measurement of net line signals resulting from erroneous background determination can be eliminated. The auto-catalyst certified reference material SRM 2556 for Pt, Pd and Rh was used for experimental demonstration of the accuracy of analytical results. Extraction with aqua regia was used as a dissolution procedure. Samples of poisoned automotive catalytic converters were analyzed. The platinum group elements, plus barium and lead were determined. Relatively high concentrations of lead (catalytic poison) were found in the catalyst samples. In this case a non-uniform longitudinal distribution (along the catalyst) of platinum group elements was established