Visual-auditory Volume Rendering of Dynamic Quantum Chemistry Molecular Fields.

This work deals with a visual-auditory visualisation of dynamic heterogeneous objects represented by continuous scalar fields obtained from quantum chemistry. The research concentrates on complex phenomena modelling and rendering aspects and takes advantage of GPU implementation. The approach uses the constructive HyperVolume for the multi-scale representation of the molecular phenomena. To propose an approach to the visual-auditory rendering, we adapt the real-time interactive volume ray-casting to compute the optical and auditory properties. We demonstrate the approach application for the visual-auditory rendering of dynamic molecular structures

Stability of negative ionization fronts: regularization by electric screening?

We recently have proposed that a reduced interfacial model for streamer propagation is able to explain spontaneous branching. Such models require regularization. In the present paper we investigate how transversal Fourier modes of a planar ionization front are regularized by the electric screening length. For a fixed value of the electric field ahead of the front we calculate the dispersion relation numerically. These results guide the derivation of analytical asymptotes for arbitrary fields: for small wave-vector k, the growth rate s(k) grows linearly with k, for large k, it saturates at some positive plateau value. We give a physical interpretation of these results.Comment: 11 pages, 2 figure

Genome-wide meta-analysis uncovers novel loci influencing circulating leptin levels.

Leptin is an adipocyte-secreted hormone, the circulating levels of which correlate closely with overall adiposity. Although rare mutations in the leptin (LEP) gene are well known to cause leptin deficiency and severe obesity, no common loci regulating circulating leptin levels have been uncovered. Therefore, we performed a genome-wide association study (GWAS) of circulating leptin levels from 32,161 individuals and followed up loci reaching P<10(-6) in 19,979 additional individuals. We identify five loci robustly associated (P<5 × 10(-8)) with leptin levels in/near LEP, SLC32A1, GCKR, CCNL1 and FTO. Although the association of the FTO obesity locus with leptin levels is abolished by adjustment for BMI, associations of the four other loci are independent of adiposity. The GCKR locus was found associated with multiple metabolic traits in previous GWAS and the CCNL1 locus with birth weight. Knockdown experiments in mouse adipose tissue explants show convincing evidence for adipogenin, a regulator of adipocyte differentiation, as the novel causal gene in the SLC32A1 locus influencing leptin levels. Our findings provide novel insights into the regulation of leptin production by adipose tissue and open new avenues for examining the influence of variation in leptin levels on adiposity and metabolic health

ВНЕДРЕНИЕ СИСТЕМЫ ХАССП КАК ЭЛЕМЕНТА УПРАВЛЕНИЯ КАЧЕСТВОМ УСЛУГ НА ПРЕДПРИЯТИЯ СФЕРЫ ГОСТЕПРИИМСТВА

The HACCP system is the main model for managing and regulating the quality of food products, and the main tool for ensuring its safety. The system allows you to track every stage of the technological process from production to sales and identify dangerous factors that can threaten both the safety of products and subsequently the health of guests.Данная статья представлена в рамках научного исследования по разработке модели пищевой безопасности для отеля «Double Tree by Hilton Moscow Vnukovo Airport», проводимого на кафедре туризма и гостиничного дела Института гостиничного бизнеса и туризма Российского Университета Дружбы Народов. Система ХАССП (НАССР) - это основная модель управления и регулирования качества пищевой продукции, и главный инструмент обеспечения ее безопасности. Система позволяет отследить каждый этап технологического процесса от производства до сбыта и выявить опасные факторы, которые могут угрожать как безопасности продукции, так и впоследствии здоровью гостей. После исследования и мониторинга состояния пищевой безопасности было выявлено, что внедрения системы, основанной на принципах ХАССП, путем управления качеством услуг организации питания в индустрии гостеприимства, является важным механизмом создания безопасного производства, а также реализации готовой продукции

Parametric Patches and Volumes in Function Representation of Geometric Solids

We take an approach to specify and control implicitly defined n-dimensional free-form solid primitives using parametric functions of n variables. Outside of the domain, the parametric function value increases or decreases rapidly that is not suitable to design geometric objects. In this paper, we introduce a functional clipping operation which allows a free-form primitive to be treated as traditional implicit primitives in set-theoretic modelling based on R-functions. We also introduce an extended B'ezier clipping operation for fast inverse mapping in the case of the changed domain. Examples of set-theoretic, offsetting, hypertexturing and metamorphosis operations on free-form primitives are given. Tessellation of trimmed parametric patches is explained as an application of our new geometric modelling method. Introduction The parametric representation of curves and surfaces is the most common one in geometric modelling and computer graphics. One of its main advantages is that the para..

"HyperJazz" project: development of geometric modelling systems with inherent symbolic interactivity

The paper presents a project called 'HyperJazz' devoted to development and implementation of the 'empirical' approach to solid modelling, which stresses the importance of interactive experiments of the user with the model. The approach is based on two foundations: geometric modelling based on the function representation and definitive programming environment. We propose a technology of user's interactive work with the modeller and a technology of creating interactive geometric modelling systems that can be adapted to different application domains and can be customized for needs of particular users. The basic set of API-procedures and the Kernel Geometric Interactive Environment are introduced. Their charasteristic feature called "inherent symbolic interactivity" is based on a high-level definitive language of point-sets. The technology of building a particular CSG system as well as an example of behaviour modelling are presented. Introduction It was recently pointed out once more in [..

Analysis of the texture profile of the soybean meat analogue for alternative nutrition

The article presents the data of the analysis of the texture profile of an analogue of semi-finished meat from soy products for alternative nutrition. Texture is a sensory indicator that can be measured on a texture analyzer using an instrumental method such as texture profile analysis (TPA), through which elasticity, chewiness, hardness, cohesion, stickiness were evaluated. In the course of the study, the task was to select a variant of the recipe for an analogue of a semi-finished meat product from soy minced meat with the introduction of mashed pumpkin and oat flakes in crushed form in different dosages. A point-based sensory assessment of the simulated samples was performed, it was found that the introduction of oat flakes into the mince system at a dosage of 10% has a beneficial effect on the strength characteristics of the semi-finished product. The rheological behavior of the products under development was studied with additional grinding of soy mince and the texture profile of an analogue of a semi-finished meat product from soy products with oat flakes and pumpkin was refined. © 2021 Author(s)

Function representation in geometric modeling: concepts, implementation and applications

Geometric modelling using continuous real functions of several variables is discussed. Modelling concepts include sets of objects, operations and relations. An object is a closed point set of n-dimensional Euclidean space with a defining inequality f x x xn (,,..., ) 1 2 0 °Ÿ¸. Transformations of a defining function are described for the set-theoretic operations, blending, offsetting, bijective mapping, projection, Cartesian product and metamorphosis. Inclusion, point membership and intersection relations are described. In the implemented interactive modelling system, we use highlevel geometric language that provides extendibility of the modelling system by input symbolic descriptions of primitives, operations and predicates. This approach supports combinations of representational styles, including constructive geometry, sweeping, soft objects, voxel-based objects, deformable and other animated objects. Application examples of aesthetic design, collisions simulation, NC machining, range data processing, and 3D texture generation are given

2D Fourier Analysis and its Application to Study of Scaling Properties and Fractal Dimensions of ε-Martensite Distribution in γ-Matrix of Fe-Mn-Si Alloy

2D Fourier analysis is proposed to obtain quantitative information on the structural amplitudes in reciprocal space for different heterophase systems. An original technique for profound computer processing of optical images transformed into an appropriate digital form is developed. Correlation Fourier analysis is applied to study a spatial distribution of γ → ε martensitic transformation product in Fe-Mn-Si shape memory alloy. An evident spatial self-similarity and scaling behavior is observed, indicating a fractal-like distribution of ε-phase in 7-matrix. The structural factor versus wave number dependence shows three scaling invariant regions with different scaling dimensions and crossover regions between them. A simple fractal model is proposed to interpret experimental results