We consider possible generation of singularities of a vector field transported by diffeomorphisms with derivatives of uniformly bounded determinants. A particular case of volume preserving diffeomrphism is the most important, since it has direct applications to the incompressible, inviscid hydrodynamics. We find relations between the directions of the vector field and the eigenvectors of the de...

The plasma nitriding edge effect phenomenon is characteristic of parts with sharp edges. intersection for the discharge negative light two adjacent faces causes apparition this effect. In some cases, disturbance to general process. work, a sample different angles 30°, 60°, and 90° was analyzed. subjected ion without cathode grid highlight reduction on non-uniformity appearing edges corners part...

We report a local minimum in thermal conductivity twisted bilayer graphene (TBG) at the angle of 1.08°, which corresponds to ‘magic angle’ transition several other reported properties. Within supercell moiré lattice, different stacking modes generate phonon scattering sites reduce TBG. The magic arises from competition between delocalization atomic vibrational amplitudes and stresses on one han...

The purpose of the article is to find out history Lidia Spaska's painting during restoration Kyiv-Podil Pokrovska Church in 1950s, and its iconographic stylistic features. research methodology based on application archival bibliographic searches, which enabled finding highlighting unknown facts; iconological methods, made it possible analyse development plots, method comparative evaluation allo...

This study presents 2-D simulations of a flow-through sudden expansion/contraction micro-channel with the existence obstacles. The bottom wall is maintained at constant flux, while other walls are adiabatic. Rectangular adiabatic obstacles mounted before expansion region on upper and lower channel used. finite element method was used to discretize equations that govern physical model. Results i...

Combined prolactin (PRL) and growth hormone (GH) secretion by a single pituitary tumor can occur in approximately 5% of cases. However, in all previously reported patients, combined secretion of both hormones was present at the time of diagnosis. Here we describe a patient initially diagnosed with a pure prolactin-secreting microadenoma, who experienced the progressive apparition of symptomatic...

A intrusion provides an unauthorized access, damage or disruption of the network. The process can understand the characteristics and nature of an intruder. The paper presents the taxonomy consists of the specification of an intruder. Taxonomy provides the classification of intruder and provides mechanism for intruder detection. We found the algorithm for developing an intruder which can be atta...

since 1970, technology innovations transformed radically the tourism processes and strategies, essentially with the Internet apparition. Nowadays, E-Tourism systems are well implanted into the Internet, with a lot of offers and online possibilities (reservations, virtual visit, etc.). Nevertheless, with the great evolution of the Internet, users’ needs and attends changed too, they are now look...