scholarly journals Power mode of axisymmetric high-speed combined extrusion of bimetallic road milling picks

2021 ◽  
Vol 66 (4) ◽  
pp. 411-419
Author(s):  
K. Yu. Bykov ◽  
I. V. Kachanov ◽  
I. M. Shatalov
Keyword(s):  
High Speed ◽  
Axisymmetric Deformation ◽  
Stage Model ◽  
Equal Area ◽  
Second Stage ◽  
Industrial Implementation ◽  
Third Stage ◽  
Power Mode ◽  
High Degree ◽  
Special Case

The article presents a simplified three-stage model of the transition from a flat to axisymmetric deformation during high-speed, combined extrusion of bimetallic road milling picks. The transition is based on the principle of equality of areas, according to which the area of a figure during a flat deformation is replaced by an equal area of a circle. In this case, it is assumed that the kinematically possible field of the slip lines remains unchanged. This approach makes it possible to reduce the number of necessary calculations and at the same time maintain a high degree of correctness of the obtained equations. The first stage shows the transition to a special case of a flat problem, in which a stepped rectangular part is extruded from the original square blank, in which one of the sides is equal to the square side of the original blank. At the second stage of the transition, a flat-step part having square sections along its entire length is extruded from the original square-section blank. Directly at the third stage, the final transition to the axisymmetric deformation of the cutter is formed, in which the area of the square is replaced by the equal area of the circle. The dependences obtained because of solving the axisymmetric problem can be recommended for calculations in the industrial implementation of the technology of high-speed combined extrusion of bimetallic milling picks.

scholarly journals Technological Analysis of Turquoise Jewelry (Based on Finds from the Scythian Burial Ground of Ak-Dag I in Tyva)

2019 ◽  
Vol 18 (7) ◽  
pp. 74-86
Author(s):  
Pavel V. Volkov ◽  
Oleg A. Mitko ◽  
Yuliy S. Gubar ◽  
Roman V. Davydov ◽  
Ivan S. Polovnikov
Keyword(s):  
Elemental Composition ◽  
High Speed ◽  
Raw Material ◽  
Burial Ground ◽  
Fine Grained ◽  
Second Stage ◽  
Time Scanning ◽  
High Speed Drilling ◽  
Third Stage ◽  
Three Stages

Purpose. The article presents results of studying the elemental composition and manufacturing technology of turquoise jewelry found in barrow 1 of the Ak-Dag I burial ground of the early Scythian time. Scanning electron microscopy and energy dispersive X-ray spectroscopy were used to determine the elemental composition of the mineral. The presence and ratio of the number of elements in the table indicates that the items are made of turquoise. The basic elements of the mineral include oxides of copper, phosphorus, aluminum and iron. A relatively large amount of iron oxide gives turquoise minerals a more saturated green color. The composition of the samples under study is extremely rich in zirconium, which allows us to identify the field where the raw material was obtained. Results. A traceological study of the artifacts considered was based on the proven methodology of experimental-traceological analysis. As a result of experimental and technological research, we conclude that the process of manufacturing occurred in three stages. Initially, the formation of the main planes of the workpieces and grinding of the ends took place. At the second stage the artifacts were drilled, the starting points of drilling were located at the narrow ends of the items. The traces of work that are visible on the artifacts indicate the use of easel, high-speed drilling. At the third stage the artifacts were processed with a fine-grained abrasive, as a result of which the final products were given a smoothed shape. Conclusion. In general, the production technology of the artifacts considered can be described as relatively perfect. There were closest analogues of the products from the Ak-Dag I site found in the same region. A similar method of inclined drilling was also used by the Scythians of Altai on their stone products.

scholarly journals The Application of the Model of High-Speed Pixel Clustering in Problems of Preprocessing of the Images of the Remote Sensing of the Earth

2020 ◽  
pp. paper41-1-paper41-13
Author(s):  
Igor Khanykov
Keyword(s):  
Remote Sensing ◽  
Quality Improvement ◽  
High Speed ◽  
Fixed Number ◽  
Correct Operation ◽  
Second Stage ◽  
Clustering Model ◽  
Squared Error ◽  
The Earth ◽  
Third Stage

The purpose of the research is to use the modified Ward’s method in high-speed processing of full-HD images of the remote sensing of the Earth. The classical Ward’s method is modified by dividing the computational process into three successive stages. The first stage quickly builds a coarse hierarchy of approximations. The second stage performs a quality improvement of the specified partition for a fixed number of colors (clusters). The third stage is the clustering of the superpixels using the Ward’s method. The software-algorithmic toolkit consists of four operations on clusters of pixels and image segments: merge operation joins together two clusters; divide operation reversibly disjoins the selected cluster into two; split operation extracts the part of the cluster into individual cluster; correct operation reclassifies pixels by extracting from one cluster and inserting into another cluster. The quality is assessed by the total squared error. The quality improvement is provided by iterative execution of a combination of merge and divide operations of pixel clusters, in particular image segments. One of the clusters (segments) is divided in two and a pair of other mismatched with it is combined into one according to the criterion of the minimum increment of the total squared error. The proposed modified Ward’s method is appropriate in processing of fullHD images of the remote sensing of the Earth. The results of processing in pure segmentation and clustering modes are compared. The proposed pixel clustering model is appropriate in high-speed processing of the fullHD images. The pixel clustering in comparison with image segmentation allows to define in more detail both the contours of objects of interest and their internal structure

Simulation of Gasless Combustion of Mechanically Activated Solid Powder Mixtures

2010 ◽  
Vol 63 ◽  
pp. 213-221 ◽  
Author(s):  
Sergey Rashkovskiy
Keyword(s):  
Experimental Data ◽  
High Speed ◽  
Gasless Combustion ◽  
Digital Recording ◽  
Powder Mixtures ◽  
Second Stage ◽  
The Third ◽  
Third Stage ◽  
Three Stages ◽  
Ignition And Combustion

The direct 3D method of numerical simulation of gasless combustion of mechanically activated solid powder mixtures is developed. The method under consideration falls into three stages. On the first stage, a simulation of mixture structure is performed. An analysis of the structure obtained in simulations is carried out. On the second stage, the thermal conductivity of solid powder mixture is calculated. On the third stage of simulation, the ignition and combustion of each particle of the mixture is considered with taking into account of heat exchange between contacting particles. The results of numerical simulations are represented dynamically and compared with the experimental data, obtained by high-speed digital recording of mechanically activated SHS systems combustion.

RAPID COMPUTATION OF GRAVITATIONAL ATTRACTION OF THREE‐DIMENSIONAL BODIES OF ARBITRARY SHAPE

Geophysics ◽  
1960 ◽  
Vol 25 (1) ◽  
pp. 203-225 ◽  
Author(s):  
Manik Talwani ◽  
Maurice Ewing
Keyword(s):  
Gravity Anomaly ◽  
Arbitrary Shape ◽  
High Speed ◽  
Three Dimensional ◽  
Isostatic Compensation ◽  
External Point ◽  
Spherical Earth ◽  
Terrain Corrections ◽  
High Degree ◽  
Special Case

An expression is derived for the gravity anomaly at an external point caused by a horizontal lamina with the boundary of an irregular polygon. This expression is put in a form suitable for computation by a high speed digital computer. By making the number of sides of the polygon sufficiently large, any irregular outline can be closely approximated. Any three dimensional body can be represented by contours. By replacing each contour by a polygonal lamina, the anomaly caused by it can be obtained at any external point. By a system of interpolation between contours combined with a numerical integration the gravity anomaly caused by the three‐dimensional body can be calculated to a high degree of precision. This method may also be used for rapidly computing terrain corrections on a flat earth. By making a small modification it can further be adopted for computing the terrain correction as well as local isostatic compensation on the Airy system up to the external radius of Hayford zone O on a spherical earth. The expression for the anomaly caused by a horizontal polygonal lamina is also obtained for the special case when the sides of the polygon are alternately parallel to the x- and y-axes, that is, the polygonal lamina can be divided into a number of rectangular laminae. A chart is provided for the hand computation of the gravity anomaly in this case.

scholarly journals Uso de tecnología HSPA (HSPA +) y su evolución con la generación de los celulares

2017 ◽  
Vol 4 (1) ◽  
pp. 164-173
Author(s):  
Fausto Orozco Iguasnia ◽  
Milton Andrade Salazar ◽  
Jaime Orozco Iguasnia ◽  
Mercedes Villarroel Sánchez
Keyword(s):  
Network Architecture ◽  
High Speed ◽  
National Level ◽  
Mac Layer ◽  
Second Stage ◽  
The Third ◽  
Use Of Data ◽  
Third Stage ◽  
Packet Access ◽  
Excellent Coverage

La necesidad la tecnología HSPA+ or Evolved High Speed Packet Access también es conocido como HSPA evolution, surgió con la creciente utilización de los datos y los usuarios que desean velocidades de descarga mucho más eficiente, en Ecuador CNT para el 2014 se propuso implementar 491 radio bases HSPA+ para alcanzar una cobertura del 84 por ciento de la población ecuatoriana y desde entonces ha alcanzado una excelente cobertura a nivel nacional.   El objetivo de este trabajo es realizar un análisis de la tecnología HSPA +, así como también su evolución a partir de la generación de los celulares, en la segunda etapa se hablará de HSPA sus ventajas, arquitectura de red, estructura de protocolos en la cual se verá la capa MAC y la capa RLC, en la tercera etapa HSDPA su arquitectura de red, sus principales mejoras, estructura de protocolos, handover en HSDPA, en la cuarta etapa HSUPA su arquitectura de red, estructura de protocolos, sus principales mejoras, sus canales y handover HSUPA, en la etapa 5 hablaremos la evolución de HSPA +  dentro del release 7.AbstractThe need for HSPA + technology or Evolved High Speed Packet Access is also known as HSPA evolution, emerged with the growing use of data and users wanting download speeds much more efficient, in Ecuador CNT for 2014 set out to implement 491 radio bases HSPA + to reach coverage of 84 percent of the Ecuadorian population and since then reaching an excellent coverage at the national level. The objective of this work is to perform an analysis of the HSPA + technology, as well as its evolution from the generation of the cellular, in the second stage we will talk about HSPA its advantages, network architecture, structure of protocols in which we will see The MAC layer and the RLC layer, in the third stage HSDPA its network architecture, its main improvements, protocol structure, handover in HSDPA, in the fourth stage HSUPA its network architecture, protocol structure, its main improvements, its channels And handover HSUPA, in stage 5 we will discuss the evolution of HSPA + within release 7 

scholarly journals THE FEATURES OF PERCEPTUAL PROCESSES DURING QUALITATIVE BIOMECHANICAL ANALYSIS

2020 ◽  
Vol 20 (S1) ◽  
pp. 98-108
Author(s):  
A Pomerantsev
Keyword(s):  
High Speed ◽  
Analytical Approach ◽  
Video Recording ◽  
Biomechanical Analysis ◽  
Movement Perception ◽  
Second Stage ◽  
High Speed Video ◽  
The Third ◽  
Third Stage ◽  
Gestalt Perception

Aim. The paper aims to identify the features of perceptual processes during qualitative biomechanical analysis. Materials and methods. The following methods were used: the study of literature on the psychology of perception and sports biomechanics; methods of experimental psychology; high-speed video recording; authors’ methods for assessing the perception of sports technique and eidos; mathematical and statistical analysis. Results. The study consisted of 3 sequential stages. The first stage of the study showed that experts' assessments did not correlate well; each expert had his individual opinion. The second stage made it possible to identify two main types of movement perception: 1) the first type is based on an analytical approach, when experts sought to decompose the movement into a set of angles to obtain as much numerical information as possible; 2) the second type is based on gestalt-perception, when experts concentrated on a holistic movement image, i. e. without dividing the movement into details. The gestalt type was more effective, accurate and quick. The third stage revealed a different level of movement perception and its correlation with special memory. The clearer and more accurate the mo­vement was, the longer it stored in the memory of experts. Conclusion. Gestalt-perception, eidolon technique and special memory form a triad of perceptual processes during evaluation of sports movements. The effectiveness of qualitative biomechanical analysis depends on maturity of each triad component.

The Coherence of Mary Barton: Romance, Realism, and Utopia

2015 ◽  
Vol 5 (3) ◽  
pp. 185-200
Author(s):  
Robert Z. Birdwell
Keyword(s):  
Thomas Carlyle ◽  
The Novel ◽  
Second Stage ◽  
The Third ◽  
Third Stage ◽  
Three Stages ◽  
Mode Of Production

Critics have argued that Elizabeth Gaskell's first novel, Mary Barton (1848), is split by a conflict between the modes of realism and romance. But the conflict does not render the novel incoherent, because Gaskell surpasses both modes through a utopian narrative that breaks with the conflict of form and gives coherence to the whole novel. Gaskell not only depicts what Thomas Carlyle called the ‘Condition of England’ in her work but also develops, through three stages, the utopia that will redeem this condition. The first stage is romantic nostalgia, a backward glance at Eden from the countryside surrounding Manchester. The second stage occurs in Manchester, as Gaskell mixes romance with a realistic mode, tracing a utopian drive toward death. The third stage is the utopian break with romantic and realistic accounts of the Condition of England and with the inadequate preceding conceptions of utopia. This third stage transforms narrative modes and figures a new mode of production.

How well do voice-hearing assessment measures capture the positive experiences of individuals?

2019 ◽  
Author(s):  
Lucy Armstrong ◽  
Lorna Hogg ◽  
Pamela Charlotte Jacobsen
Keyword(s):  
Systematic Review ◽  
Lived Experience ◽  
Second Stage ◽  
The Third ◽  
Third Stage ◽  
Hearing Assessment ◽  
Positive Experiences ◽  
Assessment Measures ◽  
Stage 1 ◽  
The Voice

The first stage of this project aims to identify assessment measures which include items on voice-hearing by way of a systematic review. The second stage is the development of a brief framework of categories of positive experiences of voice hearing, using a triangulated approach, drawing on views from both professionals and people with lived experience. The third stage will involve using the framework to identify any positve aspects of voice-hearing included in the voice hearing assessments identified in stage 1.

scholarly journals When the World Breaks Down: A 3-Stage Existential Model of Nihilism in Schizophrenia

2021 ◽  
pp. 1-24
Author(s):  
Philipp Klar ◽  
Georg Northoff
Keyword(s):  
The Self ◽  
First Person ◽  
Second Stage ◽  
Existential Crisis ◽  
Third Stage ◽  
The World ◽  
Third Person ◽  
Pathological Development ◽  
Sense Of Reality ◽  
Intentional Structure

The existential crisis of nihilism in schizophrenia has been reported since the early days of psychiatry. Taking first-person accounts concerning nihilistic experiences of both the self and the world as vantage point, we aim to develop a dynamic existential model of the pathological development of existential nihilism. Since the phenomenology of such a crisis is intrinsically subjective, we especially take the immediate and pre-reflective first-person perspective’s (FPP) experience (instead of objectified symptoms and diagnoses) of schizophrenia into consideration. The hereby developed existential model consists of 3 conceptualized stages that are nested into each other, which defines what we mean by existential. At the same time, the model intrinsically converges with the phenomenological concept of the self-world structure notable inside our existential framework. Regarding the 3 individual stages, we suggest that the onset or first stage of nihilistic pathogenesis is reflected by phenomenological solipsism, that is, a general disruption of the FPP experience. Paradigmatically, this initial disruption contains the well-known crisis of common sense in schizophrenia. The following second stage of epistemological solipsism negatively affects all possible perspectives of experience, that is, the first-, second-, and third-person perspectives of subjectivity. Therefore, within the second stage, solipsism expands from a disruption of immediate and pre-reflective experience (first stage) to a disruption of reflective experience and principal knowledge (second stage), as mirrored in abnormal epistemological limitations of principal knowledge. Finally, the experience of the annihilation of healthy self-consciousness into the ultimate collapse of the individual’s existence defines the third stage. The schizophrenic individual consequently loses her/his vital experience since the intentional structure of consciousness including any sense of reality breaks down. Such a descriptive-interpretative existential model of nihilism in schizophrenia may ultimately serve as input for future psychopathological investigations of nihilism in general, including, for instance, its manifestation in depression.

scholarly journals Fast Two-Stage Computation of an Index Policy for Multi-Armed Bandits with Setup Delays

Mathematics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 52
Author(s):  
José Niño-Mora
Keyword(s):  
Numerical Study ◽  
Arithmetic Operation ◽  
Bandit Problem ◽  
Index Policy ◽  
Two Stage ◽  
Second Stage ◽  
Whittle Index ◽  
Set Up ◽  
Computing Method ◽  
Special Case

We consider the multi-armed bandit problem with penalties for switching that include setup delays and costs, extending the former results of the author for the special case with no switching delays. A priority index for projects with setup delays that characterizes, in part, optimal policies was introduced by Asawa and Teneketzis in 1996, yet without giving a means of computing it. We present a fast two-stage index computing method, which computes the continuation index (which applies when the project has been set up) in a first stage and certain extra quantities with cubic (arithmetic-operation) complexity in the number of project states and then computes the switching index (which applies when the project is not set up), in a second stage, with quadratic complexity. The approach is based on new methodological advances on restless bandit indexation, which are introduced and deployed herein, being motivated by the limitations of previous results, exploiting the fact that the aforementioned index is the Whittle index of the project in its restless reformulation. A numerical study demonstrates substantial runtime speed-ups of the new two-stage index algorithm versus a general one-stage Whittle index algorithm. The study further gives evidence that, in a multi-project setting, the index policy is consistently nearly optimal.

Sign in / Sign up

Export Citation Format

Share Document