Bitangential interpolation in generalized Schur classes

Bitangential interpolation problems in the class of matrix valued functions in the generalized Schur class are considered in both the open unit disc and the open right half plane, including problems in which the solutions is not assumed to be holomorphic at the interpolation points. Linear fractional representations of the set of solutions to these problems are presented for invertible and singular Hermitian Pick matrices. These representations make use of a description of the ranges of linear fractional transformations with suitably chosen domains that was developed in a previous paper.Comment: Second version, corrected typos, changed subsection 5.6, 47 page

The Shape Memory Effect in 50.3Mn-39.7Ni-10.0Al Alloy

The shape memory effect has been observed in 50.3Mn- 39.7Ni-10.0Al alloy by thermal cycling under a load and bending at room temperature. A particular apparatus for bending tests is described. The second phase particles improve ductility of the intermetallic but result in incomplete shape recovery. Deformation of a dual phase material consisting the hard intermetallic matrix and the particles of the soft disordered phase is discussed

Effect of L1o → Ni5Al3 Reordering on Properties of Martensitic Ni-Al Alloys

L1o → Ni5Al3 reordering and related properties in powder Ni-Al alloys consisting 64-65 at.%Ni have been examined by X-ray diffraction and dilatometric and damping capacity measurements. The Ni5Al3 formation occurs in the L1o matrix by simple reordering of atoms with a continuous increase of the c/a ratio. As a result, degradation of shape memory effect and decrease of damping capacity are observed after short-time annealing at 200-300°C

Structural characterisation of melt-spun Ti50Ni25Cu25 ribbons

The structure of melt-spun Ti50Ni25Cu25 ribbons after various heat treatments has been studied by X-ray and TEM analyses. As-received amorphous Ti50Ni25Cu25 ribbons, when annealed at 500°C for a few minutes, crystallise into the B2 structure, which fully transforms into the orthorhombic martensite upon cooling. The X-ray scans of Ti50Ni25Cu25 ribbons annealed for 5 min. at 500°C show the well developed orthorhombic pattern, which was used for refinement of the orthorhombic martensitic structure of TiNi-Cu alloys. The refined structure of the orthorhombic martensite in TiNi-Cu alloys differs from the standard B19 type suggested previously. X-ray investigation reveals a shift of atoms in the (010)ort layers from the centro-symmetric positions towards the [00l]ort direction. The longer annealing of Ti50Ni25Cu25 ribbons at 500°C causes TiCu precipitation and results in appearance of untransformed B2 grains at room temperature. Annealing at 700°C causes Ti3Cu4 precipitation with significant Cu depletion of the matrix resulting in the appearance of the mixed orthorhombic and monoclinic martensit

Nanoscale inhomogeneities in melt-spun Ni-Al

Ni-Al material consisting 62 ...65%Ni was rapidly quenched to room temperature by the meltspinning technique and studied using X-ray diffraction, different transmission electron microscopy (TEM) modes and calorimetry measurements. Similar to bulk material, the initial B2 structure undergoes a martensitic transformation to the L1o or 14M structure. However, the transformation proceeds very inhomogeneously and results in a mixed microstructure consisting of transformed and untransformed regions. The structure of the transformed regions varies from faulted L1o to faulted 14M and shows a variety of morphological features. EDX and EELS nanoprobes reveal that the special structural state of the melt-spun material is explained mainly by solute segregation appearing during the crystallisation process. Thus, contrary to most of other melt quenched materials, in Ni-Al, solute segregation can not be suppressed by the rapid quenching procedure. Ageing at 1200°C restores the compositional homogeneity and results in more homogenious martensitic transformation resembling that in bulk Ni-Al material

Crystal structure of orthorhombic martensite in TiNi-Cu and TiNi-Pd intermetallics

The crystal structure of orthorhombic martensite in ternary TiNi-based compounds has been several times examined, although, in all cases, the structure was not completely solved as the positions of atoms in the unit cell remained unknown. In the present work, the X-ray patterns of TiNi-Cu and TiNi-Pd films were refined by the Rietveld method revealing important regularities in the location of Ti and Ni atoms. In particular, the (010) atomic planes in the orthorhombic martensite structure are always distorted and loose the planar centre of symmetry. This observation was confirmed by ab-initio calculations, where the atomic positions were varied in order to minimise the energy of electron bands

CASE RECORD OF NIFUROXASID WITHIN THE ERADICATION THERAPY SCHEME OF H. PYLORI

(Voprosy sovremennoi pediatrii = Current pediatrics. 2006;5(5):102-103

SCHEMES FOR THE ERADICATION OF HELICOBACTER PYLORI STRAINS RESISTANT TO METRONIDAZOLE AMONG CHILDREN

Treatment of the gastroenterological diseases associated with the helicobacterial infection is a complex issue. This is due to the new strains of microorganisms resistant to the medications applied. Based on the data acquired during the examination of 30 children, they showed the high efficacy of the scheme for the triple eradication therapy against helicobacteriosis, which included nifuroxazide suspension (enterofuril) along with omeprazole and clarithromycin. The authors also substantiated the expediency to prolong the treatment up to 10–14 days to improve the eradication efficacy.Key words: children, helicobacter pylori, nifuroxazide, treatment