scholarly journals RESULTS OF EXPERIMENTAL STUDIES OF THE PROCESS OF CUTTING SOFT WOOD WITH DISC KNIVES

2021 ◽  
Vol 11 (3) ◽  
pp. 86-98
Author(s):  
Vladimir Ivanovskiy ◽  
Nikolai Jujukin ◽  
Kishvarsho Safarov
Keyword(s):  
Regression Models ◽  
Optimization Problem ◽  
Experimental Studies ◽  
External Factors ◽  
Work Piece ◽  
Regression Equations ◽  
Standard Methods ◽  
Loading Mode ◽  
Section Size

Stamping of softwood is still a poorly researched process of chipless division. The research on commercially available equipment was carried out. Multivariate experiments were held according to standard methods with the number of measurements from 20 to 150 using softwood including conifers. A computer was used to substantiate the obtained coefficients of the regression equations. The magnitude of external factors such as loading mode, duration and the introduction of plasticizers were studied. Exploratory experiments made it possible to accurately establish the magnitude of the external load during direct and oblique collapse, as well as the optimal deformation temperature. Moreover, the studies were carried out taking into account the different moisture content of the wood. Regression models for four factors with two outputs were obtained. Insignificant coefficients were excluded and further research of the influence of humidity, temperature, section size and shape of the work piece on the surface quality of stamped parts were carried out. As a result, the dependence of the magnitude of deformations in wood on load and temperature was built. Solving the optimization problem made it possible to identify the following parameters of the processes of stamping softwood: density within 400 kg/m3 and temperature 156 degrees Celsius

scholarly journals RESEARCH OF THE POSSIBILITY OF INCREASING THE QUALITY OF PREPARATION OF DRY MIXTURES IN A HORIZONTAL VANE MIXER

2021 ◽  
Vol 6 (10) ◽  
pp. 99-108
Author(s):  
S. Khanin ◽  
N. Kikin ◽  
O. Mordovskaya
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Experimental Studies ◽  
Ultimate Compressive Strength ◽  
Regression Equations ◽  
Technological Parameters ◽  
Sand Mixture ◽  
Paddle Mixer ◽  
Mixed Material

Paddle mixers with horizontal shafts are common at building materials enterprises for the preparation of concretes, mortars, dry mortars. A new design of a horizontal paddle mixer with rod elements located in front of the working surfaces of the blades, changing the trajectories of material particles, increasing their mobility, which leads to an increase in the degree of homogeneity of the mixed material, is considered. The aim of the study was to assess the influence of rod elements on the quality of preparation of a cement-sand mixture, to establish patterns of influence on it by the design and technological parameters of a two-shaft paddle mixer and to determine the areas of their rational values. The following tasks have been solved. A bench installation of a two-shaft horizontal paddle mixer with rod elements has been developed, on which experimental studies have been carried out on the preparation of dry cement-sand mixtures. For the criterion characterizing the quality of the mixture, the ultimate compressive strength of the prism specimens made from it is adopted. Regression equations are obtained that adequately describe the compressive strength of prism samples from the design and technological parameters of the mixer: the angle of the blades, the distance from the working surfaces of the blades to the rod elements, the rotational speed of the blade shafts, and their analysis is performed. The analysis of the change in the ultimate compressive strength of the prism specimens from the parameters under study is carried out, the rational ranges of their values are determined. It was found that a mixer with rod elements allows to obtain a dry cement-sand mixture, products from which have a higher compressive strength. During the work, the method of mathematical planning of experiments was used. As a result of the study, an assessment of the influence of rod elements on the quality of preparation of a cement-sand mixture was carried out, the regularities of the influence on it of the design and technological parameters of a two-shaft paddle mixer and the area of their rational values were established.

scholarly journals Regularities of metal flow and defects transformation during rolling in roughing stands of a universal rail and structural mill

2021 ◽  
Vol 64 (10) ◽  
pp. 712-720
Author(s):  
A. A. Umanskii ◽  
A. B. Yur'ev ◽  
L. V. Dumova
Keyword(s):  
Cross Section ◽  
Spatial Orientation ◽  
Surface Defects ◽  
Metal Flow ◽  
Experimental Studies ◽  
Regression Equations ◽  
Internal Defects ◽  
The Cross ◽  
Roll Out

Experimental studies carried out in the conditions of a laboratory rolling mill have determined the regularities of the processes of metal flow and roll-out defects of billets during deformation in roughing stands of a universal rail and structural mill. In relation to the box size and gauges types "lying trapeze" and "trapeze", we have determined a significant irregularity of drawing coefficients of the surface layers by roll length and width, as well as the irregularity of drawing in the cross-section of the roll during rolling. It is shown that during deformation the surface zones adjacent to the ends of the roll are subjected to the greatest drawing, and dependence of irregularity of the drawing coefficients over the cross-section of the roll on the shape of the deformation zone has a distinct power-law character. We have established a significant effect of the drawing coefficient, as well as the location and spatial orientation of the billet defects, while the geometric dimensions of the defects don't have such influence on their roll-out coefficients. According to the obtained data, the defects located on the rolling edges are rolled out most intensively both in depth and width, and the transverse defects are rolled out the least intensively. At the same time, the rollability of any defects increases with the growth of drawing coefficient. It is determined that near the side edges of the roll there is an increase in the width (disclosure) of transverse and inclined defects relative to the rolling axis, as well as the disclosure of defects occurs at the end sections of the roll in relation to longitudinal defects. For internal defects, it was found that, similar to surface defects, an increase in the drawing coefficient during rolling contributes to an increase in their roll-out, while the rollout coefficient of internal defects in absolute value is significantly lower than this indicator for surface defects. It was determined that the minimum roll-out coefficient of internal defects occurs when they are located in the core of the sample, while the roll-out coefficient of such defects increases linearly when moving towards the roll surface. The influence of the location, spatial orientation, and drawing coefficient on the rollability of surface and internal defects is generalized in the form of regression equations. It makes it possible to use them in practice to predict the quality of finished rolled metal when changing rolling modes.

scholarly journals TECHNOLOGY FOR CREATING THE TOPOLOGY OF PRINTED CIRCUIT BOARDS USING POLYMER 3D MASKS

2021 ◽  
pp. 120-131
Author(s):  
Igor Nevliudov ◽  
Evgeny Razumov-Fryzyuk ◽  
Dmytro Nikitin ◽  
Danila Bliznyuk ◽  
Roman Strelets
Keyword(s):  
3D Printing ◽  
Regression Models ◽  
Printed Circuit Boards ◽  
Printed Circuit Board ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Circuit Board ◽  
Work Piece ◽  
Circuit Boards ◽  
Printed Circuit

The subject of research is the influence of factors of exposure of two-dimensional images on the topology of conductors in the manufacture of printed circuit boards by the method of three-dimensional polymer photomasks. The purpose of the work is ensuring the accuracy and preservation of the geometric dimensions of the conductors of printed circuit boards during LCD exposure of masks on the work piece. To achieve this goal, it is necessary to solve the following tasks: to analyze photolithography technology and types of polymer 3D printing; to develop a technological process for exposing photopolymer masks to a printed circuit board blank using 3D printing technologies; to conduct experimental studies to determine the optimal exposure parameters; on the basis of the empirical results obtained, to calculate the correlation coefficients of the factors for recall; to construct a linear regression model of the dependence of the deviations of the geometric dimensions of the printed conductors on the parameters of solutions for etching and exposure conditions. Results: The constructed regression models will become the basis for creating a software database that optimizes the initial images of the topology of printed conductors in the automated production of printed circuit boards. This will simplify the process of developing the topology of printed circuit boards, taking into account the real influence of the parameters of the technological operations of etching and exposure on the thickness of the tracks of the conductors of the printed circuit boards, which will reduce the proportion of rejects in the manufacture of single- and double-sided printed circuit boards. Conclusions: an LCD exposure technology and a method for studying the effects of exposure factors on the quality of printed circuit board topology are proposed, which provide sufficient empirical data to create regression models for calculating the influence of technological factors on the final dimensions of conductive paths in the production of printed circuit boards. Further development of the proposed technology will make it possible to manufacture rigid and flexible printed circuit boards completely, with conductive paths, a dielectric base, electronic elements that can be used in various devices.

scholarly journals Modeling the Quality of New Wheat Varieties in Kazakhstan

2019 ◽  
Vol 3 (1) ◽  
pp. 30
Author(s):  
Dauletbakovbakytkan Dauletbakovbakytkan ◽  
Dauletbakov Galym
Keyword(s):  
Regression Models ◽  
Grain Quality ◽  
Regression Equations ◽  
Grain Production ◽  
Wheat Varieties ◽  
New Varieties ◽  
Main Components ◽  
The Relationship ◽  
Significant Factors

The work investigates and demonstrates the analytical capabilities of statistical methods in the development of new varieties of wheat used for the production of pasta. By using examples of Kostanay, Pavlodar, Akmola, North-Kazakhstan region (NKR) and Aktobe regions, foridentifying significant factors, there were constructed regression equations due to initial factors, on the main components, according to the panel data. Based on the analysis of various regression models, the strengths of the relationship between the number  indicators of the grain quality there was found soft and hard wheat varieties (Mereke 70, Tselina 50, Ertis 97, Astana 2, Astana, Aktobe39, Baiterek), taking into account the peculiarities of grain production in this area.

scholarly journals Impoving the quality of products created by additive technologies on the basisi of tig welding

2021 ◽  
Vol 5 (1) ◽  
pp. 103-112
Author(s):  
Alexander Salenko ◽  
А. Kostenko ◽  
D. Tsurkan ◽  
Oleksii Samoilenko ◽  
Olga Chencheva ◽  
...  
Keyword(s):  
Dynamic Stability ◽  
Experimental Studies ◽  
Response Surfaces ◽  
Geometric Parameters ◽  
Tig Welding ◽  
Layer By Layer ◽  
Regression Equations ◽  
Proposed Model ◽  
Quality Of Products

The paper deals with the issues of obtaining the minimum waviness of surfaces formed by additive processes of TIG welding. It is known that the geometric parameters of the melt bead, which form a reproducible workpiece layer by layer, are determined by both the energy and kinematic characteristics of the process. In this case, the laying of the rollers occurs with optimal overlap, as a result of which it is possible to achieve the maximum density of the model, however, with the simultaneous appearance of a certain waviness due to thermodynamic phenomena in the melt bath. The proposed model of the formation of a bead of melt, the use of which made it possible to establish the rational conditions for laying out the layers. Experimental studies of the process of argon-arc surfacing of models of a given, regression equations for determining the controlled waviness parameter are obtained. It is shown that the waviness parameter is influenced by dynamic phenomena and wave processes that develop under the action of a system of forces during the formation of a melt bead. An improvement in the quality of products is seen in the optimization of the methods of forming the rollers, in ensuring the dynamic stability of the movement of the working head, ensuring the appropriate overlap of the trajectories of movement along the layers of the layout by an amount of 0.5e, establishing a rational arc length, and maintaining the dynamic stability of the arc burning. The response surfaces of the objective functions in the planes of the process parameters are constructed, which provide a clear illustration of the dependence of the controlled geometric parameters on the welding modes.

Imaging through Scattering Media with a Learning Based Prior

2020 ◽  
Vol 2020 (14) ◽  
pp. 306-1-306-6
Author(s):  
Florian Schiffers ◽  
Lionel Fiske ◽  
Pablo Ruiz ◽  
Aggelos K. Katsaggelos ◽  
Oliver Cossairt
Keyword(s):  
Optimization Problem ◽  
Autonomous Driving ◽  
Scattering Media ◽  
Photon Scattering ◽  
Point Spread ◽  
Spread Function ◽  
Radiative Transport Equation ◽  
Spatio Temporal ◽  
Transient Imaging

Imaging through scattering media finds applications in diverse fields from biomedicine to autonomous driving. However, interpreting the resulting images is difficult due to blur caused by the scattering of photons within the medium. Transient information, captured with fast temporal sensors, can be used to significantly improve the quality of images acquired in scattering conditions. Photon scattering, within a highly scattering media, is well modeled by the diffusion approximation of the Radiative Transport Equation (RTE). Its solution is easily derived which can be interpreted as a Spatio-Temporal Point Spread Function (STPSF). In this paper, we first discuss the properties of the ST-PSF and subsequently use this knowledge to simulate transient imaging through highly scattering media. We then propose a framework to invert the forward model, which assumes Poisson noise, to recover a noise-free, unblurred image by solving an optimization problem.

Flouride and Nitrate Status of Some Ground Waters in Chittor District of Rajasthan State (India)

2018 ◽  
Vol 6 (9) ◽  
pp. 119
Author(s):  
Trapti Sharma ◽  
R. P. Nagar ◽  
R. C. Gaur ◽  
Pooja Gupta ◽  
Charanjit Kaur
Keyword(s):  
Point Of View ◽  
World Health ◽  
Indian Council ◽  
Standard Methods ◽  
Ground Waters ◽  
Drinking Waters ◽  
Health Organization ◽  
Research World ◽  
Drinking Purpose

In Rajasthan state the ground waters of some areas like Ramganj-mandi, Morak, Barmer, Jaisalmer, Chittor and Udaipur etc. are susceptible from drinking point of view.To test the quality of groundwater in Chittor district 14, ground water samples were collected from various places and analyzed for pH, E.C., Fluoride and Nitrate parameters by standard methods (A.P.H. A., Washington, USA, 1995). The study revealed that none of the ground waters was found suitable completely from drinking point of view. Some are having electrical conductivity > 1.4 dS/m, some are having pH >8.5, some area having fluoride >1.5 ppm and some are having nitrate>45 ppm. These are the limits of various parameters permitted by various International authorities like Bureau of Indian Standard, Indian Council of Medical Research,world health Organization etc. for drinking waters. So, it is recommended to the residents of above areas to use water for drinking purpose only after reverse osmosis or adopting suitable method of removing excess of Fluoride and Nitrate for drinking water to avoid unwanted pathogenic diseases harmful for human health.

STRATEGI MENINGKATKAN LOYALITAS KONSUMEN MAKANAN KHAS KOTA CURUP KABUPATEN REJANG LEBONG

2019 ◽  
Author(s):  
Onsardi Onsardi
Keyword(s):  
Swot Analysis ◽  
Raw Materials ◽  
External Factors ◽  
Consumer Loyalty ◽  
Internal Factors ◽  
The Public ◽  
Typical Food ◽  
Internal And External Factors

The title of this study is the Strategy of Increasing Consumer Food Loyalty in CurupCity, Rejang Lebong Regency (Case Study in "Henvian" Typical Food Industry). Thisresearch is based on the importance of strategies in increasing business and consumerloyalty to products sold.Strategies to increase business and consumer loyalty can bedone with a SWOT analysis. Place of this research is the "Henvian" shop that sellstypical Rejang lebong food. The method used in this study is descriptive qualitative.Informants in this study were people who were considered to know for certain about theHENVIAN Specialty Food Store in Curup City, Rejang Lebong Regency. The dataanalysis technique used in this study is a SWOT analysis to determine the strengths,weaknesses, opportunities and threats in a typical Rejang Lebong food business.By using SWOT analysis techniques that consist of strengths (weakness), weaknesses(weakness), opportunities (opportnity) and threats (threath). The results of this studycan be concluded that the internal factors that are the strength of the marketing strategyare the quality of the product that is good at a price affordable to the public andtourists, service that is friendly and responsive to consumer needs, as well astechnological advancements that facilitate the promotion of business. Internal factorsthat are a weakness are often lack of stock, there are some products that do not meet thestandard packaging, the product shelf life is short, employees do not use uniforms.External factors that become opportunities are a fairly high economic community,abundant raw materials while external factors that are a threat are the manycompetitors, an unstable economy, the price of basic needs increases. Based on theresults of the SWOT analysis of internal and external factors, the strategy used is toimprove product quality by improving the appearance of packaging and quality ofcontent and quality of service by providing uniforms to employees and providingstandards of service to consumers. .Keywords: Strategy, Consumer Loyalty, SWOT

The system of indicators of the quality of the carbon-carbon composite materials and technologies of their production

2018 ◽  
pp. 127-132
Author(s):  
T. N. Antipova ◽  
D. S. Shiroyan
Keyword(s):  
Composite Material ◽  
Low Cost ◽  
Experimental Studies ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Optimal Number ◽  
Laboratory Equipment ◽  
Carbon Composite Material ◽  
Carbon Composite Materials

The system of indicators of quality of carbon-carbon composite material and technological operations of its production is proved in the work. As a result of the experimental studies, with respect to the existing laboratory equipment, the optimal number of cycles of saturation of the reinforcing frame with a carbon matrix is determined. It was found that to obtain a carbon-carbon composite material with a low cost and the required quality indicators, it is necessary to introduce additional parameters of the pitch melt at the impregnation stage.

scholarly journals Joint optimization of computing ratio and access points’ density for mixed mobile edge/cloud computing

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Tianqi Jing ◽  
Shiwen He ◽  
Fei Yu ◽  
Yongming Huang ◽  
Luxi Yang ◽  
...  
Keyword(s):  
Cloud Computing ◽  
Coverage Probability ◽  
Optimization Problem ◽  
Mobile Cloud Computing ◽  
Low Complexity ◽  
Mixed Integer ◽  
Joint Optimization ◽  
Mobile Cloud ◽  
Convex Problem

AbstractCooperation between the mobile edge computing (MEC) and the mobile cloud computing (MCC) in offloading computing could improve quality of service (QoS) of user equipments (UEs) with computation-intensive tasks. In this paper, in order to minimize the expect charge, we focus on the problem of how to offload the computation-intensive task from the resource-scarce UE to access point’s (AP) and the cloud, and the density allocation of APs’ at mobile edge. We consider three offloading computing modes and focus on the coverage probability of each mode and corresponding ergodic rates. The resulting optimization problem is a mixed-integer and non-convex problem in the objective function and constraints. We propose a low-complexity suboptimal algorithm called Iteration of Convex Optimization and Nonlinear Programming (ICONP) to solve it. Numerical results verify the better performance of our proposed algorithm. Optimal computing ratios and APs’ density allocation contribute to the charge saving.

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