Incoherent pion photoproduction on the deuteron with polarization observables I: Formal expressions

Formal expressions are developed for the general five-fold differential cross section of incoherent $\pi$-photoproduction on the deuteron including beam and target polarization. The polarization observables of the cross section are described by various beam, target and beam-target asymmetries for polarized photons and/or polarized deuterons. They are given as bilinear hermitean forms in the reaction matrix elements divided by the unpolarized cross section. In addition, the corresponding observables for the semi-exclusive reaction $\vec d(\vec \gamma,\pi)NN$ are also given.Comment: 11 pages, 1 figur

Orbital stability of solutions to the problem on capillary-gravity waves in two-fluid layer

Going back to N. E. Kochin [1] problem about capillary-gravity waves on interface of two-fluid flow is considered as bifurcation problem with spectral parameters

Self-dual Yang-Mills fields in pseudoeuclidean spaces

The self-duality Yang-Mills equations in pseudoeuclidean spaces of dimensions $d\leq 8$ are investigated. New classes of solutions of the equations are found. Extended solutions to the D=10, N=1 supergravity and super Yang-Mills equations are constructed from these solutions.Comment: 9 pages, LaTeX, no figure

Annihilation of edge dislocations in smectic A liquid crystals

This paper presents a theoretical study of the annihilation of edge dislocations in the same smectic plane in a bulk smectic-A phase. We use a time-dependent Landau-Ginzburg approach where the smectic ordering is described by the complex order parameter psi( r--> ,t) =eta e(iphi) . This quantity allows both the degree of layering and the position of the layers to be monitored. We are able to follow both precollision and postcollision regimes, and distinguish different early and late behaviors within these regimes. The early precollision regime is driven by changes in the phi ( r--> ) configuration. The relative velocity of the defects is approximately inversely proportional to the interdefect separation distance. In the late precollision regime the symmetry changes within the cores of defects also become influential. Following the defect collision, in the early postcollision stage, bulk layer order is approached exponentially in time. At very late times, however, there seems to be a long-time power-law tail in the order parameter fluctuation relaxation

NbS3_{3}: A unique quasi one-dimensional conductor with three charge density wave transitions

Through transport, compositional and structural studies, we review the features of the charge-density wave (CDW) conductor of NbS$_{3}$ (phase II). We highlight three central results: 1) In addition to the previously reported CDW transitions at $T_{P1}$ = 360\,K and $T_{P2}$ = 150\,K, another CDW transition occurs at a much higher temperature $T_{P0}$ = 620-650\,K; evidence for the non-linear conductivity of this CDW is presented. 2) We show that CDW associated with the $T_{P2}$ - transition arises from S vacancies acting as donors. Such a CDW transition has not been observed before. 3) We show exceptional coherence of the $T_{P1}$-CDW at room-temperature. Additionally, we report on the effects of uniaxial strain on the CDW transition temperatures and transport.Comment: 16 pages, 18 figure

Learning courses on scanning probe microscopy: new opportunities

Преподавание курсов по зондовой микроскопии для студентов и школьников с использованием новых разработанных нами микроскопов-конструкторов СММ-2000 пополнилось новыми приѐмами. Учащиеся сами собирают микроскопы, стараются увидеть существуют ли на самом деле атомы, приобщаются к мировой науке, и выполняют учебные работы в виде исследований. Это делает освоение зондовой микроскопии эмоциональным, и подготавливает учащихся к занятиям наукой.Traditional courses on scanning probe microscopy for students using our new designed microscopes «SMM-2000» has replenished with four new techniques. Now students can assemble microscopes themselves, try to see and ascertain whether the materials actually made of atoms, making scans of actual samples of scientists, and perform a serious research. This makes full and emotional learning, orienting and preparing students to serious science

Production of Ions of Metals with an ECR Ion Source at FLNR (JINR) cyclotrons

Two ECR ion sources : DECRIS-14-2 and ECR4M are presently in permanent operation at the FLNR cyclotrons U400M and U400, correspondingly. During last two years the major effort were made in production of high current stable ion beams of solids with the relatively low melting point in the mass range from Li to Bi. Both the evaporator and MIVOC methods were used. Among the solids such an exotic beam as 48Ca was produced at the U400 cyclotron with high efficiency. The main results on production of solid ions will be reported

Comparative Analysis of Properties of the Carbon-Based Coatings Obtained through Various PVD and CVD Deposition Methods

The paper examines carbon 0.5-1 thick coatings obtained through various physical vapour deposition and chemical vapour deposition methods on stainless steel and tool steel substrates. Their composition, morphology and physical properties have also been studied. The correlations of erosive wear resistance and H3/E2 ratio (where H is hardness and E is elastic modulus) have been identified for carbon coatings in regards to the production method. Ta-C carbon coatings demonstrate high resistance to dynamic loads with erosive wear in a sand-blast machine. © Published under licence by IOP Publishing Ltd