Beyond Moore's technologies: operation principles of a superconductor alternative

The predictions of Moore's law are considered by experts to be valid until 2020 giving rise to "post-Moore's" technologies afterwards. Energy efficiency is one of the major challenges in high-performance computing that should be answered. Superconductor digital technology is a promising post-Moore's alternative for the development of supercomputers. In this paper, we consider operation principles of an energy-efficient superconductor logic and memory circuits with a short retrospective review of their evolution. We analyze their shortcomings in respect to computer circuits design. Possible ways of further research are outlined.Comment: OPEN ACCES

Study of effect of damage accumulation on stress distribution parameters in mesovolume of biocomposite and its performance characteristics

Abstract—A numerical study of mechanical properties of zirconium ceramic–cortical bone tissue biocomposite has been fulfilled using a multiple-scale approach. Evolution of mesoscopic stress distribution in the components of biocomposite during its deformation has been studied with the assumption of damage accumulation until the macrostrength criterion is fulfilled. It has been shown that the parameters of the laws of distribution change with damage accumulation

STRUCTURE FORMATION PROCESS OF HYDRATED PORTLAND CEMENT COMPOSITIONS: NANOSCALE LEVEL CONTROL

Durability of cement-like construction materials, as well as durability of cement stone, depends on their humidity resistance, frost resistance, corrosion resistance. All of these properties depend not only on the composition of the original clinker, but also on structural organization at micro-and nanoscale level of hydrated portland cement compositions. In this research the authors used the method of small-angle neutron scattering to define structural parameters of hydrated portland cement compositions on nanoscale level, distribution of calcium hydrate silicate nanoparticles in size, medium nanoparticles radius, fractal dimension. It is shown, that introduction of modifying nanoadditives into portland cement compositions affects structural parameters of a cement stone. The following nanoadditives were used: of artificial (alpha aluminium oxide, gamma aluminum oxide) and of anthropogenic (carbonate and alumo-alkaline sludges) origin, as well as integrated nanoadditives containing surfactants. The change in structural parameters of portland cement compositions with nanoadditives in the process of hydration is investigated. It is shown that use of nanoadditives allows to control the process of forming the structure of hydrated portland cement composition on the nanoscale level, directly affect the values of structural parameters and, as a result, modify properties of cement stone

Influence of the spin-dependent quasiparticle distribution on the Josephson current through a ferromagnetic weak link

The Josephson current flowing through weak links containing ferromagnetic elements is studied theoretically under the condition that the quasiparticle distribution over energy states in the interlayer is spin-dependent. It is shown that the interplay between the spin-dependent quasiparticle distribution and the triplet superconducting correlations induced by the proximity effect between the superconducting leads and ferromagnetic elements of the interlayer, leads to the appearence of an additional contribution to the Josephson current. This additional contribution $j_t$ can be extracted from the full Josephson current in experiment. The features of the additional supercurrent $j_t$, which are of main physical interest are the following: (i) We propose the experimental setup, where the contributions given by the short-range (SRTC) and long-range (LRTC) components of triplet superconducting correlations in the interlayer can be measured separately. It can be realized on the basis of S/N/F/N/S junction, where the interlayer is composed of two normal metal regions with a spiral ferromagnet layer sandwiched between them. For the case of tunnel junctions the measurement of $j_t$ in such a system can provide direct information about the energy-resolved anomalous Green's function components describing SRTC and LRTC. (ii) In some cases the exchange field-suppressed supercurrent can be not only recovered but also enhanced with respect to its value for non-magnetic junction with the same interface resistances by the presence of spin-dependent quasiparticle distribution. This effect is demonstrated for S/N/S junction with magnetic S/N interfaces. In addition, it is also found that under the considered conditions the dependence of the Josephson current on temperature can be nontrivial: at first the current rises upon temperature increasing and only after that starts to decline.Comment: 19 pages, 9 figures, published version, presentation improve

Priority goals for the strategic development of industrial enterprises based on sustainable marketing

The article was prepared on the basis of the conceptual research method that relies on the study of academic literature to find and integrate various concepts, including aspects of sustainable development, marketing management of an industrial enterprise, organizational levels of decision-making, and strategic managemen

Synthesis of heterocycles compounds from condensation of limonene with aldehydes using heteropolyacids supported on metal oxides

In this contribution, heterogeneous materials based on heteropolyacids (HPA, H3PW12040 hydrate) supported over several metal oxides (TiO2, SiO2, SBA-15, Al2O3) were prepared using wetness impregnation, characterized by XRD, FTIR, SEM, acidity by TPD, nitrogen physisorption, RAMAN spectroscopy, 31P NMR and then evaluated in the catalytic condensation of limonene with benzaldehyde. After incorporation of HPA over each support, no structural changes were observed as it was suggest by FTIR, RAMAN and XRD. Acidity analysis by TPD-NH3 showed that increasing the HPA amount increases the acidity of the catalyst until it is constant (20–30%). HPA over alumina, silica and SBA-15 also showed high values of acidity but less than typical HPA/P25 catalyst (HPA over commercial Degussa P25). This last was one of the most selective materials (surface area of 39 m2/g and acidity of 187 µmol NH3. gcat−1) for the synthesis of 3-oxabyciclo[3.3.1]nonane (up to 80%) with a low selectivity to the limonene isomers by-products. The use of water as a solvent decreased considerably the catalytic activity. The same observation was found when the volume of the solvent increased to 30 mL. Besides, catalytic condensation can be performed at free solvent conditions and at room temperature; however, when decrease temperature, a higher number of isomers was observed rather than the desired product. In addition, catalytic condensation was also evaluated in biomass of essential oils and mixtures with sesquiterpenes showing good to excellent results. Typical LHHW mechanism was evident after kinetic analysis. HPA/P25 was shown to be a robust material since can be reused up to two times with a possible decrease in its catalytic activity.Funding for open access charge: CRUE-Universitat Jaume

ДИФЕРЕНЦІЙОВАНИЙ АЛГОРИТМ ВЕДЕННЯ ПАЦІЄНТОК РЕПРОДУКТИВНОГО ВІКУ, ХВОРИХ НА ЛЕЙОМІОМУ МАТКИ З РІЗНИМ ТИПОМ БІОЦЕНОЗУ ПІХВИ

Мета дослідження – розробити алгоритм профілактики та терапії порушень біоценозу піхви жінок репродуктивного віку, хворих на лейоміому матки. Матеріали та методи. Обстежено 216 жінок репродуктивного віку, хворих на лейоміому матки. Бактеріологічно досліджено матеріал із піхви, цервікального каналу, уретри, тканин лейоматозних вузлів. Результати дослідження та їх обговорення. У хворих на лейоміому матки переважав ІІ ступінь «чистоти» піхви – «проміжний тип» мазка (46,8 %). Бактеріальний вагіноз діагностовано у 42,6 % випадках, вагініт – у 10,2 %. Встановлена достовірна різниця між частотою визначення Mycoplasma hominis у піхвовому вмісті, цервікальному каналі та тканинах лейоматозних вузлів, де частота визначення була на 28,9 % та 27,6 % вища, Ureaplasma urealyticum – на 30,2 % та 28,4 %,Virus papilloma homynis онкогенні типи – на 18,8 % та 18,2 % відповідно. Розроблено, удосконалено та застосовано алгоритми діагностики, профілактики та терапії порушень біоценозу піхви у жінок репродуктивного віку, хворих на лейоміому матки. Висновки. Диференційований алгоритм ведення жінок репродуктивного віку, хворих на лейоміому матки, полягав у проведенні моніторингу біоценозу піхви 2–3 рази на рік, профілактичному застосуванні пробіотиків. Етіотропну терапію дисбіозу піхви, вагініту слід розпочинати з 5-ї доби терапії пробіотиками. Перспективами подальших розробок будуть дослідження ретроспективного аналізу медичної документації жінок репродуктивного віку, хворих на лейоміому матки