Research of the drawing of bars plate in the refiners

Object of research of article is the drawing of bars plate in the refiners at refining of chips and wood pulp. On the basis of the theory of contact interaction of bars influence of the drawing of plate on characteristics of contact processes is investigated. The friction coefficient between plate decreases at increase in density of contact of bars. At increase in an angle of crossing of bars rotor and stator and refining of pulp with concentration up to 6% the coefficient of friction decreases. At increase in an angle of crossing of bars chips and pulp with concentration over 10% the coefficient of friction increases. Therefore it is recommended to increase the angle of crossing of bars rotor and stator at refining of pulp of low concentration, and at refining of pulp of concentration over 10% and chips - to reduce, up to a radial arrangement.

DESIGN AND MODELING OF STRAIGHT-BLADE VERTICAL AXIS WIND TURBINE IN PAKISTAN

Pakistan is one of those countries which has large potential of energy harvest from renewable energy sources and specially from wind. With the surge of global warming, the world is moving towards cleaner and viable sources of energy. Horizontal Axis Wind Turbines (HAWT) currently dominates the most of the wind power farm markets in the world but Vertical Axis Wind Turbines (VAWT) are also capable of harvesting large amounts of energy with benefits over the HAWTS. VAWTS do not need a control system to be pointed in the direction of wind because with its blade in radial arrangement, wind from any direction is useful. In this report, a Straight-Blade VAWT is designed for low speeds and its performance parameters are also identified for which the improvement of the VAWT will be obtained. Self-starting ability of VAWT is also analyzed and stress and vibration analysis will be investigated in ANSYS Fluent.

First report of an aegagropilous form of Cladophora prolifera (Cladophorales, Chlorophyta) from the lagoon of Strunjan (Gulf of Trieste, northern Adriatic)

The occurrence of unattached spherical (aegagropilous) populations of the green alga Cladophora prolifera in the marine lagoon of Strunjan (Gulf of Trieste) is reported. Species identification was based on molecular and morphological data, and the distribution, ecology and morphological features of the aegagropilous populations are described. The ball-shaped form of this species differs from the typical upright attached form found on open shores by the radial arrangement of the branches and the absence of cells and rhizoids with clear annular constrictions. The formation of the aegagropilous form of C. prolifera likely results from specific hydrodynamic conditions in the human-mediated environment of the marine lagoon, in combination with morphological development of the species. The Strunjan marine lagoon appears to be the only location in the Mediterranean Sea, or even worldwide, where aegagropilous forms of C. prolifera occur in large abundance. Based on the high associated biodiversity, we propose the inclusion of these populations to be considered in conservation management plans in the area.

Dandelion pappus morphing is actuated by radially patterned material swelling

Plants can generate motion by absorbing and releasing water. Such motion often facilitates reproductive success through the dispersal of seeds and fruits or their self-burial into the soil. Asteraceae plants, such as the dandelion, often have a hairy pappus attached to their fruits to allow them to fly and in many cases, these can open and close depending on moisture levels to modify dispersal. Here we demonstrate the relationship between structure, composition and function of the underlying hygroscopic actuator. By investigating the structure and properties of the actuator cell walls we have identified the mechanism by which the dandelion pappus closes and developed a structural computational model that can capture observed pappus closing. This model was used to explore the contribution of differential material domains in the actuator function and the critical design features. We find that the actuator relies on the radial arrangement of vascular bundles and surrounding tissues including cortex and the floral podium around a central cavity. This allows heterogeneous swelling in a radially symmetric manner to co-ordinate precise movements of the pappus hairs attached at the upper flank. This actuator is a derivative of bilayer structures, but is radial and can synchronise the movement of a planar or lateral attachment. The simple, material-based mechanism presents a promising biomimetic potential in robotics and functional materials.

The Role of Transient Attention in the Radial-tangential Anisotropy of Crowding

Crowding refers to the failure to identify a peripheral object due to its proximity to other objects (flankers). This phenomenon can lead to reading and object recognition impairments, and is associated with macular degeneration, amblyopia, and dyslexia. Crucially, the minimal target-flanker spacing required for the crowding interference (critical spacing) increases with eccentricity. This spacing is also larger when target and flankers appear along the horizontal meridian (radial arrangement) than when the flankers appear above and below the target (tangential arrangement). This phenomenon is known as radial–tangential anisotropy. Previous studies have demonstrated that transient attention can reduce crowding interference. However, it is still unclear whether and how attention interacts with the radial–tangential anisotropy. To address this issue, we manipulated transient attention by using a cue either at the target (valid) or fixation (neutral) location, in both radial and tangential target-flanker arrangements. Results showed that critical spacing was larger in the radial than in the tangential arrangement, and that cueing the target location improved performance and reduced the critical spacing for both radial and tangential arrangements, to the same extent. Together, our findings suggest that transient spatial attention plays an essential role in crowding but not in the radial-tangential anisotropy.

Cerulean Cataract in a Person with Down s Syndrome

We report the case of an 18-year-old patient who consults for a loss of visual acuity in the right eye for 1 year. On clinical examination, visual acuity is 20/100. Eye tone is 12 mmhg. Examination of the anterior segment shows the existence of a cataract made up of whitish opacities corresponding to a congenital cerulean cataract (Figure 1). The treatment consisted of a cataract cure by phacoemulsification with good progress. Cerulean cataract is a rare congenital form of bluish tint, made up of whitish opacities in concentric layers with a radial arrangement at their center. Visual acuity is fairly good in childhood but may deteriorate later. In the literature, the incidence of cataracts in Down’s children ranges from 5% to 50%. In previous studies of congenital or infantile cataract, 3-5 % of cases were associated with Down’s syndrome [1].

the Study of some histopathological changes occurring in white laboratory mice infected with Cutaneous Leishmaniasis in Al – diwaniyah province, Iraq.

Leishmaniasis is caused by an intracellular parasite . It is endemic in Asia, Africa, the Americas, and the Mediterranean region. Worldwide, 1.5 to 2 million new cases occur each year .The histological study of the liver tissue of white laboratory mice (Mus musculus) infected with L. major a parasite showed The presence of severe steatosis of hepatocytes Hepatocyte degeneration, And loss of the radial arrangement of hepatocytes, With heavy infiltration in inflammatory cells, especially phagocytes( Macrophage) with Hyperplasia and congestion of the bile duct . As for histological sections of skin lesions taken from ear , Foot , tail ، were showed epidermal ulcerative , Accompanied by severe leaching of the dermis layer neutrophil ,polymorph lymphocytes ، with hemorrhage of ​​the dermis, with necrosis of the epidermal cells of all skin lesions in the ear, foot and tail.

Mixture model investigation of the inner–outer asymmetry in visual crowding reveals a heavier weight towards the visual periphery

Crowding, the failure to identify a peripheral item in clutter, is an essential bottleneck in visual information processing. A hallmark characteristic of crowding is the inner–outer asymmetry in which the outer flanker (more eccentric) produces stronger interference than the inner one (closer to the fovea). We tested the contribution of the inner-outer asymmetry to the pattern of crowding errors in a typical radial crowding display in which both flankers are presented simultaneously on the horizontal meridian. In two experiments, observers were asked to estimate the orientation of a Gabor target. Instead of the target, observers reported the outer flanker much more frequently than the inner one. When the target was the outer Gabor, crowding was reduced. Furthermore, when there were four flankers, two on each side of the target, observers misreported the outer flanker adjacent to the target, not the outermost flanker. Model comparisons suggested that orientation crowding reflects sampling over a weighted sum of the represented features, in which the outer flanker is more heavily weighted compared to the inner one. Our findings reveal a counterintuitive phenomenon: in a radial arrangement of orientation crowding, within a region of selection, the outer item dominates appearance more than the inner one.

Configurations of Fortified Settlements of the Sintashta-Petrovka Type: Forms, Sizes, Transformations

The article aims to analyze the configurations of fortified settlements of the Sintashta-Petrovka type (SPT settlements). Sources of information about the configurations are the results of remote research (aerial photographs, geomagnetic maps, topographic maps) and data from archaeological excavations. The study of configurations is one of the aspects of settlement archaeology at the level of research of the structure of the whole settlement. The article summarizes and compares the characteristics of forms, layouts, sizes, variants of transformations. The forms of SPT settlements can be divided into two types: rounded, with a radial arrangement of rows of dwellings, and subrectangular, with a linear arrangement. Eight sites are classified as rounded, sixteen are subrectangular. In the forms of many settlements there are mixed signs that emphasize the common architectural tradition: rounded settlements have separate straightened segments and straight rows of buildings, and subrectangular ones have rounded bends of building lines and rounded corner sections. In summarizing the size indicators, small, medium and large settlements were identified. The small ones have an area from 6 to 13 m2; thousand nine sites – subrectangular, with two rows of dwellings, and rounded, with one ring of buildings – are small. The small m2. settlements have about 20 to 30 buildings. The number of medium settlements is also nine, their area is from 15 to 21 thousand Most medium-sized sites are either subrectangular, with four rows of buildings, or rounded, with two rings of buildings. The medium m2. sized settlements have about 40 to 60 buildings. There are six large settlements; their area is 23 to 32 thousand Two of the large settlements are oval, four subrectangular, with traces of significant rearrangements. Due to the small volume of field research, it is difficult to estimate the number of dwellings in large settlements. The generalization of the remote data and the results of the excavations allows the author to propose a scheme of transformations of the SPT settlements. The structural component of their configurations is a row of closely spaced dwellings, enclosed by a line of fortifications. Several rows, most often two or four, oriented linearly or radially, form the inner space of the closed fortified settlement. While the fortified settlements functioned, they were restructured, with preservation of the general principles of regularity and isolation of the living environment. There are three main scenarios for rebuilding: the completion of rows to the early section, the overlapping of fortified villages, the reduction of the area of a fortified settlement. The final stage of the life of settlements is associated with the gradual abandonment of the cramped and closed configurations. The Srubnaya-Alakul settlements, successors of the SPT settlements, use more spacious, dispersed layouts, with partial preservation of the tradition of building rows of closely spaced dwellings and with refusal to build fortifications.