scholarly journals Scientifically substantiated definition of quality optimum parameters for surface layer low-rigid shafts at centrifugal runningin

2016 ◽  
Vol 1 (6) ◽  
pp. 28-34
Author(s):  
С. Зайдес ◽  
S. Zaides ◽  
А. Горбунов ◽  
A. Gorbunov
Keyword(s):  
Grain Size ◽  
Surface Layer ◽  
Experimental Results ◽  
Cold Hardening ◽  
Layer Depth ◽  
Optimum Parameters ◽  
A Value ◽  
Basic Parameters ◽  
Definition Of

A surface layer and a cold-hardening depth as basic parameters ensuring quality of low-rigid shafts are analyzed. A value of an interference area depending on a grain size which is a criterion for the definition of strengthened layer depth is established. The experimental results on the definition of quality basic parameters for a surface layer at the strengthening for the depth of an interference area are shown.

scholarly journals THEORETICAL FUNDAMENTALS OF ESTIMATABILITY ASSESSMENT OF TRAIN SITUATION SIGNS FOR WORK OF INTELLECTUAL LOCOMOTIVE CONTROL SYSTEMS

2021 ◽  
Vol 1 (38) ◽  
pp. 223-231
Author(s):  
O. Gorobсhenko
Keyword(s):  
Control Systems ◽  
Random Search ◽  
Information Value ◽  
Train Control ◽  
Relative Value ◽  
Basic Parameters ◽  
Control Decision ◽  
Definition Of

The article is devoted to the problem of implementation of intelligent control systems in transport. An important task is to assess the information parameters of the control systems. In the existing works the question of definition of one of the basic parameters of functioning of locomotive control systems - information value of separate signs of a train situation is not considered. This does not make it possible to determine the order of signal processing at the input and assess their contribution to the adoption of a control decision. Moreover, informativeness is a relative value, which is expressed in the different information value of a particular feature for the classification of different train situations. Also, the informativeness of the feature may depend on the type of decisive rules in the classification procedure. The quality of recognition of a train situation in which the locomotive crew is, depends on the quality of the features used by the classification system. The decisive criterion for the informativeness of the features in the problem of pattern recognition is the magnitude of losses from errors. To determine the range of the most informative features of train situations, the method of random search with adaptation was used. The results of the work make it possible to optimize the operation of automated and intelligent train control systems by reducing the amount of calculations and simplifying their algorithm.

scholarly journals Rated definition of degree of cutter coating influence upon parameters of surface layer quality of parts worked

2017 ◽  
Vol 2 (7) ◽  
pp. 20-24
Author(s):  
Вячеслав Безъязычный ◽  
Vyacheslav Bezyazychnyy ◽  
Максим Басков ◽  
Maksim Baskov
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Residual Stresses ◽  
Layer Surface ◽  
Wear Resistant Coatings ◽  
Cutter Wear ◽  
Definition Of ◽  
Surface Layer Quality ◽  
The Impact

The impact of cutter wear-resistant coatings upon cutting process parameters and characteristics of surface layer quality in the parts worked: residual stresses, a degree and a depth of work hardening of a surface layer, surface roughness is investigated.

scholarly journals Surface layer quality in compressor titanium blades at multiaxes deep grinding

2017 ◽  
Vol 2 (12) ◽  
pp. 15-19
Author(s):  
В. Полетаев ◽  
V. Poletaev ◽  
Е. Цветков ◽  
E. Tsvetko
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Residual Stresses ◽  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Blade Surface ◽  
A Value ◽  
Surface Layer Quality

The investigation results of technological conditions impact at multiaxes deep grinding upon quality of titanium alloy blade surface layer in the compressors of gas turbine engines (GTE) are presented. The grinding mode impact upon a surface and a value of residual stresses in a surface layer of blades is defined and also conditions for defect occurrence as burns on blade surfaces under machining are detected.

Grain Refinement in AZ61 Mg Alloy during Hot Cyclic Bending

2010 ◽  
Vol 667-669 ◽  
pp. 623-627
Author(s):  
Yu Pei Jiang ◽  
Xu Yue Yang ◽  
Lei Zhang
Keyword(s):  
Grain Size ◽  
Surface Layer ◽  
Magnesium Alloy ◽  
Grain Refinement ◽  
Volume Fraction ◽  
Hardness Distribution ◽  
High Angle ◽  
Cyclic Bending ◽  
A Value ◽  
Metallographic Observation

Strain-induced grain refinement in magnesium alloy AZ61 was studied by means of cyclic bending carried out at a temperature 623K. The deformed microstructures were investigated by optical and SEM/EBSD metallographic observation. The results show that the grain size of the surface layer can be significant refined to about 3 μm by dynamic recrystallization. The volume fraction of new grains increases with strain and reaches a value of 0.8 after 8 passes. Most of the new grains are separated by high angle boundaries. Hardness distribution through thickness for the cyclic bended sheet exhibits “V” shape with the marked difference between the surface and the inside, the hardness is critically increased in surface layer, i.e. ~82 Hv, which is about 1.39 times than the as-received AZ61.

Technological Features of Obtaining of Nanostructured Coatings on TiNi Base by Magnetron Sputtering

2014 ◽  
Vol 1064 ◽  
pp. 160-164
Author(s):  
P.O. Rusinov ◽  
Zh.M. Blednova
Keyword(s):  
Grain Size ◽  
Surface Layer ◽  
Phase Composition ◽  
Experimental Design ◽  
Magnetron Sputtering ◽  
Performance Criteria ◽  
Surface Layers ◽  
Determining Factors ◽  
Process Studies

Using the methods of experimental design made ​​the choice determining factors for the calculation of modes magnetron sputtering coating SME steel 321H; received mathematical-statistical model that relates the performance criteria with the main parameters of the process. Studies on developing the technology of magnetron sputtering materials with shape memory TiNi-based study of the structure and formed surface layers showed that the recommended spraying regimes provided obtain a homogeneous quality of the surface layer with a grain size of 15 nm to 50 nm, chemical and phase composition which provides the memory effect.

Pyroreflectometry to Determine the True Temperature and Optical Properties of Surfaces

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
D. Hernandez ◽  
J. L. Sans ◽  
M. Pfänder
Keyword(s):  
Optical Properties ◽  
Experimental Results ◽  
Radiative Properties ◽  
True Temperature ◽  
Fundamental Parameters ◽  
Optical Fiber Probe ◽  
Measurement Results ◽  
Definition Of ◽  
Method Accuracy

In this paper, we present a theoretical analysis and experimental results of a pyrometric temperature measurement method based on a two-color pyroreflectometer (working wavelengths of 1.3μm and 1.55μm) equipped with an optical fiber probe. By measuring simultaneously the radiance temperature and the normal reflectivity, the true temperature of the measurement target can be determined without the previous knowledge of the optical properties of the sample. The method is based on the introduction and the definition of the diffusivity factor ηd and the assumption that it is equal for the two wavelengths. Besides the experimental results, the sources of errors and their impact on the method accuracy and the performance of the setup are discussed. The quality of the measurement results demonstrates the utility of the pyroreflectometry in a domain where fundamental parameters, such as the temperature and radiative properties, present the major measurement difficulties. The diffusivity factor appears not only a step to determine the true temperature but also as a parameter very useful to evaluate the diffusing behavior of opaque materials.

scholarly journals A Surface Transition Layer Model for Size Effect in T2 Copper Micro-Compression

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 736
Author(s):  
Deng ◽  
Liu ◽  
Wang ◽  
Jin
Keyword(s):  
Grain Size ◽  
Surface Layer ◽  
Flow Stress ◽  
Sample Size ◽  
Transition Layer ◽  
Strain Curve ◽  
Experimental Results ◽  
Layer Model ◽  
Stress Strain ◽  
Surface Transition

The effects of sample size and grain size on the surface morphology and flow stress of deformed samples were investigated by means of copper micro-cylinder compression experiments at room temperature. The results of SEM showed that when the grain size increased or the sample size decreased, the deformation non-uniformity of samples’ free surfaces increased. Meanwhile, the stress–strain curves showed that during the compression process, the flow stress of the sample also tended to decrease as the grain size increased or the sample size decreased. According to the experimental results of nanoindentation, a surface transition layer model was established on the basis of the surface layer model by considering the mutual constraint of grains and the existence of transition layer grains. The experimental results indicated that the stress–strain curve calculated by the surface transition layer model can more accurately reflect the actual deformation situation of the material compared to the surface layer model.

scholarly journals Ecological comfort and public spaces

2020 ◽  
pp. 75-90
Author(s):  
Vera Sergeevna Zazulya
Keyword(s):  
Urban Environment ◽  
Public Spaces ◽  
Key Factors ◽  
Special Significance ◽  
Man And Nature ◽  
Basic Parameters ◽  
The Subject ◽  
Definition Of

The key factors influencing psychological and physiological comfort of urban residents include the level of environmental quality, presence of green spaces, connection between man and nature. The increase in urban density makes the creation of ecological comfort zones especially relevant. The subject of this research is the peculiarities of formation of such zone within the structure of public spaces, taking into account the current requirements to the quality of urban environment. The author highlights special significance of public spaces as one of the key object for creation of ecological comfort zones; as well as examines the key problems in formation of public spaces on the background of dynamic urban development.  Clarification is given to the definition of the concept of “ecological comfort in accordance with the basic parameters. The author substantiates the role of public spaces as the important areas in improvement of the quality of life in a modern city. Having analyzed the modern approaches and trends in designing a comfortable urban environment, the author makes proposals on the formation and modernization of ecological comfort zones within the structure of public spaces, as well as systematizes most relevant requirements to determine promising vectors in designing such objects.

SUBGOAL ORDERING AND GRANULARITY CONTROL FOR INCREMENTAL PLANNING

2007 ◽  
Vol 16 (04) ◽  
pp. 707-723 ◽  
Author(s):  
CHIH-WEI HSU ◽  
YIXIN CHEN ◽  
BENJAMIN W. WAH
Keyword(s):  
Grain Size ◽  
Study Strategies ◽  
Partial Orders ◽  
Experimental Results ◽  
Planning Problem ◽  
Solution Quality ◽  
Time Efficiency ◽  
Trade Offs ◽  
Incremental Planning

In this paper, we study strategies in incremental planning for ordering and grouping subproblems partitioned by the subgoals of a planning problem. To generate a rich set of partial orders for ordering subproblems, we propose an algorithm based on a relaxed plan that ignores the delete lists. The new algorithm considers both the initial and the goal states and can effectively order subgoals in such a way that greatly reduces the number of invalidations during incremental planning. We have also considered trade-offs between the granularity of the subgoal sets and the complexity of solving the overall planning problem. We propose an efficient strategy for dynamically adjusting the grain size in partitioning in order to minimize the total complexity. We further evaluate a redundant-ordering scheme that uses two different subgoal orders to improve the solution quality, without greatly sacrificing run-time efficiency. Experimental results on using Metric-FF, YAHSP, and LPG-TD-speed as the embedded planners in incremental planning show that our strategies are general for improving the time and quality of these planners across various benchmarks. Finally, we compare the performance of the three planners, the incremental versions using these planners as embedded planners, and SGPlan4.1.

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

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