Slide Wall Research Articles

Выбор материалов и конструктивных решений раздвижной стены сменного кузова

Purpose: Material choice and construction development of sliding wall for interchangeable body with expanding side walls and roof. Methods: Development and calculation of interchangeable body sliding wall construction were being fulfilled according to several technical-normative documentations with the help of engineering programs COMRAS- 3Dv18.1 and SOLIDWORKS 2016. Mechanical trials of samples were held on the basis of Petersburg Transport University in Mechanical Laboratory named after Prof. Belelyubskiy N. A. Results: interchangeable body slide door construction has been developed. The variants of samples of interchangeable body side wall of various materials and construction are proposed. Sample “on location” trials to define mechanical properties were pursued. The results on experimental and theoretical research to define stress-deformable sample states for interchangeable body sliding side walls ‘re given. Practical importance: The developed construction of sliding wall with various material application makes it possible to lower tare mass of new being projected interchangeable and removable bodies with expanding slide walls and roof wherein preserving own strength characteristics.

Can Photons Pass through Primary Coatings Used to Treat Cutaneous Wounds?

To determine the transmittance spectrum of primary dressings commonly used in the treatment of cutaneous wounds to verify if there is a real need to remove them during photobiomodulation. Spectroscopic analysis was performed on 17 dressings using a spectrophotometer (USB 2000+; OceanOptics, Delray Beach, Florida). A piece of each dressing was inserted into a quartz cuvette; the reflection from the slide walls was corrected for using a 0.9% saline solution to completely fill the cuvette (baseline). The transmittance of each dressing was measured between 350 and 950 nm, and a transmittance table was created based on the main wavelengths used in photobiomodulation. Six dressings (Supriderme, Membracel, Cuticell Contact, UrgoTul, Tegaderm, and Opsite Flexigrid) have a transmittance greater than 50% in most of the spectral range and therefore may remain on wounds during irradiation. It may not always be necessary to remove a primary dressing when lasers or LED lights are used to treat wounds. It is the authors' hope that the results of this article will increase the effectiveness of both photobiomodulation and primary dressings and reduce patient discomfort as well as the cost of primary dressings via a reduction in unnecessary dressing changes.

Chemically reacting mixed convective Casson fluid flow in the presence of MHD and porous medium through group theoretical analysis

AbstractThis paper explores the consequences of chemically reacting magnetohydrodynamic mixed convective fluid substances driven by the porous medium, slippery, incompressible, and laminar vertical channel flow. Casson fluid model in a vertical channel is strengthened with mixed convection flow. The effects of the heat source‐sink parameter, the suction‐injection parameter, slips on the slide wall, and thermal radiation are also considered. A Lie group method is taken into consideration and nonlinear partial differential equations are converted into nonlinear ordinary differential equations (ODEs). The NDSolve command solves these ODEs and shows the action of the related parameters in the velocity, temperature, and concentration figures. The Casson fluid parameter increases the velocity profile but reduces the concentration profile. The parameter of suction‐injection enhances the velocity, temperature, and concentration profiles. The variations in skin‐friction coefficient in the heat and mass transfer rate are addressed in the diagrams. Moreover, streamlines are plotted for suction‐injection parameter.

Sidewall-friction-driven ordering transition in granular channel flows: Implications for granular rheology.

We report a transition from a disordered state to an ordered state in the flow of nearly monodisperse granular matter flowing in an inclined channel with planar slide walls and a bumpy base, using discrete element method simulations. For low particle-sidewall friction coefficients, the flowing particles are disordered, however, for high sidewall friction, an ordered state is obtained, characterized by a layering of the particles and hexagonal packing of the particles in each layer. The extent of ordering, quantified by the local bond-orientational order parameter, varies in the cross section of the channel, with the highest ordering near the sidewalls. The flow transition significantly affects the local rheology-the effective friction coefficient is lower, and the packing fraction is higher, in the ordered state compared to the disordered state. A simple model, incorporating the extent of local ordering, is shown to describe the rheology of the system.

An investigation on the distribution of massive fiber granules in rotor spinning units

Rotor spinning is an open-end spinning method that uses air as the medium to transform the fibers into yarn. Nowadays, the properties of its final product—yarn—such as yarn strength and yarn twist, are not satisfied due to the fiber morphology, which greatly depends on the distribution of the massive fibers in the rotor spinning unit (RSU). In this paper, theoretical analysis is given to describe the trajectory of fiber on the slide wall. A numerical study is performed with the massive fibers being simplified into granules to study their distribution characteristics in the RSU. According to our numerical results, the forming process of the fibrous ring is discussed and the effects of two variables, the rotor speed and the angle of the slide wall, on the distribution of fiber granules were also studied. The simulation results indicate that the fiber granules are not evenly distributed during their transport in the fiber transport channel (FTC) and they tend to accumulate on the upper and lower edge of the FTC. The distribution of fiber granules in the groove (fibrous rings) is closely related to the rotor speed. The higher the rotor speed, the longer and thinner the fibrous ring. The distribution of fiber granules on the slide wall is related to the angle of the slide wall such that a smaller angle leads to a scattered distribution on the slide wall, while a larger angle tends to bring a concentrated one. The simulation results show good agreements with our experimental results.

Computational simulation of air flow in the rotor spinning unit

A three-dimensional computational model is established to simulate the air flow patterns in the rotor spinning unit of a rotor spinning machine. The effects of rotor speed, rotor diameter and rotor slide wall angle on air flow characteristics and hence yarn properties are investigated. The airstream accelerates from the transfer channel inlet to the outlet. There are velocity differences in both the cross-section and along the transfer channel, causing hooked fibers to straighten. The airstream swirls around the rotor at a high speed. However, vortices that can cause fiber curving and buckling are formed inside the rotor. The effect of rotor speed is significant. There are more vortices near the wall at a lower rotor speed, while too large a rotor speed can lead to an excessive centrifugal force, thus increasing yarn breakages. The rotor diameter affects the flow characteristics in a way similar to that of rotor speed. As a smaller slide wall angle generates higher velocities in the transfer channel and more stable velocities in the rotor groove, a small angle is preferable. Computational modeling has provided a useful insight into the rotor spinning flow pattern, thus it can be used to optimize the rotor design to produce better rotor spun yarn.

Analysis of submarine landsliding in the rupture area of the 27 February 2010 Maule earthquake, Central Chile

The comparison of bathymetric datasets compiled before and after the Mw = 8.8 Maule Earthquake of the 27 February 2010 offshore Central Chile proves that no new submarine landslides on a size scale detectable with hull-mounted bathymetric echosounders (features of a horizontal size of > 1 km) formed as a direct consequence of the ground shaking. Gravity coring around a pre-existing slide feature offshore Concepción (BioBio Slide), however, documents that (1) a number of events occurred as retrogressive failures of the BioBio Slide wall, the youngest of which is 700–1000 years old, and that (2) a very recent small scale slide structure resulted from non-destructive imbricate stacking of a thin sediment layer. Pore water geochemical data show that this event post-dates the Maule Earthquake, suggesting that it was triggered by one of the numerous aftershocks. The absence of larger failures and the presence of a small slide let us propose that in contrast to apparent logic, frequent violent earthquakes at convergent margins do not necessarily pose a particular tsunami risk by landslides. The frequent shaking might even limit the slide volume and therefore their tsunami hazard, as instead of rare and large slides, frequent smaller slides are induced.

Large-scale rock landslide slip surface location analysis and strength parameters evaluation

Large-scale rock landslides have huge impacts on various large-scale rock engineering and project operations. They are also important aspects evaluating geological disasters. In the initial evaluations on the stability of large-scale rock landslides, in most cases, it is difficult to conduct evaluation or to have accurate evaluations because most of large-scale rock landslides are huge in size, high in slopes, and located in the canyon of mountains, which makes the exploration very difficult and thus hard to get credible data on slip surface form, location, depth and strength. This paper describes the Badi landslide happened along the Lancang River, and systematically introduces methods to analyze and verify large-scale slip surface form using terrain conditions surrounding the large-scale landslide, shape of the slide walls, and development patterns of streams and gully. This paper also introduces ways to obtain strength parameters of slip surface with the soil in the slide zone by using the principles of stress state, principles of gravity compaction, structure regeneration and strength regeneration. It is confirmed that analyzed results to the slip surface are basically consistent with the exploration results. The methods introduced here have been successfully applied to evaluate the stability of Badi large-scale rock landslide and have been applied in engineering practices.

Onset of rod eutectic morphology in directional solidification

Initial dynamics of morphological selection in a succinonitrile-(D)camphor organic transparent rod eutectic system is investigated experimentally using directional solidification with specimen thicknesses of 20 and 200 μm. The shape of the solid/liquid interface, the specimen thickness, the initial single-phase boundary thickness, and the grain boundaries are all observed to influence the onset of the eutectic morphology in a geometrically constrained system. Additionally, initiation of eutectic growth within a thin liquid layer at the specimen slide wall and lateral propagation of the array is observed, as suggested in a previous study by the present authors.

On the selection of rod-type eutectic morphologies: Geometrical constraint and array orientation

Rod eutectic growth in succinonitrile–( d)camphor is investigated experimentally using directional solidification with specimen thicknesses ranging from 20 to 200 μm. Measurements in the projected plane are reconciled with a model for array distortion under the constraint imparted by the geometry, and the influence of geometry is examined with respect to the two-dimensional (2D) array basis vectors. A transition from 3D to quasi-3D growth at very low velocity is observed, where specimen thickness becomes comparable to eutectic spacing. The principal finding is a velocity-dependent but thickness-independent transition in array orientation in the “bulk” regime. The transition is correlated with the dominant unstable mode in the initial succinonitrile front, and we assert that this instability controls the array spacing along the slide wall direction. It is concluded that this type of analysis is required for meaningful interpretation of experimental results regarding rod eutectic growth, even in the apparent thick-slab or “bulk” regime.

関東山地東縁，青梅市成木崩壊地の地形，堆積物の特徴と崩壊の発生時期の推定

The Nariki Landslide is a large failure located in the Nariki Unit of Jurassic Chichibu sedimentary complex on the eastern margin of the Kanto Mountains, central Japan. The landslide is composed of a slide wall in the occurrence area, and upper and lower gentle slopes in the sedimentation area. Both upper and lower gentle slope deposits consist mainly of cobble to boulder-sized angular gravels and underlie tephric loess more than 1 m thick. The Nariki River carved out the lower gentle slope and formed late to latest Late Pleistocene fluvial terraces, suggesting that the failure should have occurred before the Late Pleistocene.

Particle Motion on the Slide Wall in Rotor Spinning

A mathematical treatment to describe the movement of particles on the slide wall of a rotor-spinning machine is given. The general solution to the differential equations of motion of such a particle is derived and the special case pertaining when the particle movement begins at time t = 0 then examined. From the general equations, an expression for the slide time of the particle can be derived and is used, with typical values, to provide sample slide times in practical cases. Uses of the treatment in providing information about lubricant distribution and trash accumulation, with consequent damage, are suggested, as also is an application of the principles to practical yarn production and quality factors.

Fibre Motion on the Slide Wall in Rotor Spinning

By using principles, established earlier, for particle motion in rotor spinning, it is possible to develop a mathematical model to describe the movement of actual fibres on the slide wall of the rotor. Three stages — attachment, sliding and collection — may be identified. By analysing the forces under which the fibre microcomponents move at each stage, it can be shown that their motion, like that of particles, occurs by centrifugal action in the direction of the internal generatrix of the rotor-cone, from its smaller to its larger diameter, to the collecting groove. Further details of the mechanism by which fibres move are also presented.

壁板中央にすべり面を有する鉄筋コンクリート耐震壁に関する研究

To obtain a reinforced concrete shear wall having large shear ductility, author propose to install a slide mechanism at the center of wall panel (slide wall). Experimental study on cyclic loading behavior of slide wall was carried out. Based on equations (1) (2), four one-third scall slide walls were designed. Outline of test results are showm in Table 4 and Fig. 11, 12. In each wall, ultimate shear strength was more than 0.15 Fc, in terms of the nominal shear stress of a wall, and no significant loss of strength was detected until the displacement at 0. 02 radian. Based on simple assumptions, analytical study on behavior of slide wall was carried out. The load-deflection diagrams obtained by the analysis showes a good agreement with the exprimental results (Fig. 28).

Motion of Slender Body in an Open-End Spinning Rotor

The motion of slender body in an modelled rotor which is, in size, twice as large as the practical Toyoda BD-200 Open-End spinning rotor have been investigated experimentally. Furthermore, the equation of motion based on Shiomi's analysis was calculated numerically, and compared with the experimental results.The results obtained were summarized as follows.1) After the slender body leaves the exit of the transport tube, it moves toward the bottom, and then rises to the surface and at last moves rotationally toward the slide wall of the rotor.2) The slender body collides to the slide wall of the rotor from the back of it, and then falls forward.3) In regard to the motion of the slender body, experimental results agree well with theoretical results based on Shiomi's analysis.

32—DEPOSITS IN THE ROTOR GROOVE IN OPEN-END SPINNING PART III: THE EFFECT OF YARN ROTATION IN THE PERIPHERAL-TWIST ZONE

It is shown in this paper that the direction of rotation about its own axis of the section of yarn in the peripheral-twist zone depends upon whether the yarn is withdrawn from the front or the back of the rotor, irrespective of the direction of rotation of the rotor or of the direction of twist in the yarn, and that this affects the rate of build-up of deposits in the rotor groove. Front take-off gives inward rotation, which pushes particles down the slide wall into the rotor groove, whereas back take-off gives outward rotation, which tends to keep the groove clean. The shape of the groove also affects the rate of build-up of deposits and the maximum spinning time.

33—DEPOSITS IN THE ROTOR GROOVE IN OPEN-END SPINNING PART IV: THE EFFECTS OF GROOVE SHAPE, YARN LINEAR DENSITY, DIRECTION OF TAKE-OFF, ROTOR DIRECTION, AND TWIST IN YARN

Yarn take-off from the back of the rotor is shown to reduce rotor deposits substantially. The shape of the rotor groove is shown to affect the amount of material deposited in a given time (1 hr), as also is the yarn linear density. These phenomena are explained in terms of the concept of an effective collecting area for deposits on the slide wall. A modified rotor groove gave better yarn properties as well as fewer deposits. Yarn take-off from the back also gave fewer deposits, but the improvement in yarn properties was less, possibly owing to the influence of some design feature tending to increase irregularity.