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[en] A confocal scanner for selective observation of the vertical particle tracks in the nuclear photoemulsion is described. The particle track being searched for is imaging at an angle of 45° with respect to the optical axis of the system. The confocal scanner is provided with a new optical element, an “image orthogonalizator,” by means of which the extended image of the inclined vertical particle track is rotated through an angle of 90°. The stereoscopic version of the confocal scanner is presented as well. The described systems will be used in experiments for the investigation of neutrino oscillations in the accelerator.
[en] Experimental data and results of theoretical studies dealing with the synthesis of nanoparticles by the condensation of products of chemical reactions in reverse microemulsions are generalized. Attention is focused on the analysis of mechanisms of nanoparticle nucleation and growth. The bibliography includes 252 references.
[en] The FoMos Company produces the two-side photoemulsion band, wherefrom the films of the required size are cut out for using them as photoemulsion tracers. The methodology is described and the results of measuring the distortions in several such films, cut out from different parts of the standard section of the two-side band ∼ 7 m long and useful width of ∼ 20 cm, are presented. The nominal thickness of the studied film plastic base is 190 μm, the opposite sides whereof are coated with the layers (∼ 50 μm) of the diluted RKhZ gel emulsion
[ru]Фирма ФоМос производит двухстороннюю фотоэмульсионную ленту, из которой вырезаются пленки требуемого размера для использования их в качестве фотоэмульсионных трекеров. Описана методика и представлены результаты измерения дисторсий в нескольких таких пленках, вырезанных из разных участков стандартного отрезка двухсторонней ленты длиной ∼ 7 м и полезной шириной ∼ 20 см. Номинальная толщина пластиковой основы исследуемой ленты 190 мкм, на противоположные стороны которой нанесены слои (∼ 50 мкм) разбавленной эмульсии-геля РХЗ
[en] The aim of this paper is to derive the exact distributions of the likelihood ratio tests of homogeneity and scale hypothesis when the observations are generalized gamma distributed. The special cases of exponential, Rayleigh, Weibull or gamma distributed observations are discussed exclusively. The photoemulsion experiment analysis and scale test with missing time-to-failure observations are present to illustrate the applications of methods discussed
[en] Complete text of publication follows. Nanogels, or small particles formed by physically or chemically crosslinked polymer networks, represent a niche in the development of 'smart' nanoparticles for drug delivery and diagnostics. They offer unique advantages over other systems, including a large and flexible surface for multivalent bio-conjugation; an internal 3D aqueous environment for incorporation and protection of (bio)molecular drugs; the possibility to entrap active metal or mineral cores for imaging or phototherapeutic purposes; stimuli-responsiveness to achieve temporal and/or site control of the release function and biocompatibility. Moreover, conformability and flexibility make these nanoparticles able to penetrate through small pores and channels through shape modification. Major synthetic strategies for the preparation of nanogels belong to either micro-fabrication methodologies (photolithography, microfluidic, micromoulding) or to self-assembly approaches that exploit ionic, hydrophobic or covalent interactions. When dimensional control has been achieved through the recourse to 'soft templates', such as the internal aqueous phase droplets of inverse microemulsions, the use of surfactants, initiators and catalysts often require complex purification procedures. On the other hand, micro-fabrication methods, such as nanomoulding, are limited by the need of costly equipments. The availability of inexpensive and robust preparation methodologies is at the basis of the development of effective nanogel-based theragnostic devices. High energy radiation processing already demonstrated its potential for the production of nanogels in the late 90's, owing to the pioneeristic work of Rosiak and collaborators, but since no adequate efforts have been spent in developing a viable and robust technology to produce multi-functional nanogels for the benefit of several different nanotechnology application fields, such as sensing, medicine and multiple others. The design rules for mass fabrication of nanoscale hydrogel particles with the recourse to industrial-type accelerators will be discussed. Radiation engineered nanogels may become base building blocks of higher order structures with designed properties, through the integration of heterogeneous components of different sizes and compositions, including biomolecules.
[en] Microemulsions in the critical region and slightly away from this region showed differing aggregation behaviour on polymer addition, characterised by Df, the fractal dimension. While the critical samples showed a marked Df dependence on polymer molecular weight, the off-critical samples in the 1-phase region showed a convergence to a common Df on approaching phase separation
[en] A highly efficient algorithm for the reconstruction of microstructures of heterogeneous media from spatial correlation functions is presented. Since many experimental techniques yield two-point correlation functions, the restoration of heterogeneous structures, such as composites, porous materials, microemulsions, ceramics, or polymer blends, is an inverse problem of fundamental importance. Similar to previously proposed algorithms, the new method relies on Monte Carlo optimization, representing the microstructure on a discrete grid. An efficient way to update the correlation functions after local changes to the structure is introduced. In addition, the rate of convergence is substantially enhanced by selective Monte Carlo moves at interfaces. Speedups over prior methods of more than two orders of magnitude are thus achieved. Moreover, an improved minimization protocol leads to additional gains. The algorithm is ideally suited for implementation on parallel computers. The increase in efficiency brings new classes of problems within the realm of the tractable, notably those involving several different structural length scales and/or components