tudy of the properties of the wood fiber board’s modified by a petro polymer resin

2015 ◽  
Vol 5 (2) ◽  
pp. 120-131
Author(s):  
Вострикова ◽  
Galina Vostrikova ◽  
Филимонова ◽  
Olga Filimonova ◽  
Никулина ◽  
...  
Keyword(s):  
Technological Process ◽  
Wood Fiber ◽  
Latin Square ◽  
Planning Method ◽  
Thermal Hardening ◽  
Experimental Planning ◽  
Polymer Resin

A technology for the modifying treatment of the wood fiber boards (WFB) by a solution of a petropolymer resin obtained from C9-fraction is considered. The technological process of modification of WFB included a number of operations on samples preparation, impregnation in a modifying composition and thermal hardening of the prepared composites. The process of the WFB modification was studied applying an experimental planning method based on a scheme of the greek-latin square of the forth order.

Polymer-Bitumen Binders Compositions Selection by Using the Experimental Planning Method

2021 ◽  
Vol 887 ◽  
pp. 504-510
Author(s):  
V.D. Galdina ◽  
N.S. Galdin
Keyword(s):  
Operating Conditions ◽  
Planning Method ◽  
Regression Equations ◽  
Experimental Planning ◽  
Petroleum Bitumen ◽  
Styrene Butadiene Styrene ◽  
Technical Properties ◽  
And Performance ◽  
Styrene Butadiene ◽  
Butadiene Styrene

The paper presents the studies on the compositions selection and properties of polymer-bitumen binders obtained using the viscous petroleum bitumen, styrene-butadiene-styrene polymer and plasticizer according to the experimental planning method. Regression equations of the polymer-bitumen binders processing and performance properties, which make it possible to optimize the compositions and predict their properties taking into account the operating conditions, were obtained. Polymer-bitumen binders in comparison with the properties of viscous road bitumen have the increased indicators of heat resistance, crack toughness, ductility and elasticity. To obtain the adequate mathematical model, the experimental data were processed, compositions were optimized and dependence diagrams were constructed by using the Maple software package. The software for a personal computer including the algorithm and program for selecting the polymer-bitumen binders has been developed. When using the software it is possible to automate the calculation of the polymer-bitumen binders compositions with a given set of technical properties.

Simulation of Thermomechanical Control Processing of Steels through the Use of Experimental Planning and FEM

2013 ◽  
Vol 762 ◽  
pp. 289-294
Author(s):  
G.E. Kodzhaspirov ◽  
A.I. Rudskoy
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Strain Rate ◽  
Cross Section ◽  
Computer Modelling ◽  
Planning Method ◽  
Combined Effect ◽  
Experimental Planning ◽  
Temperature Strain

The experimental planning method has been used for the examination of the combined effect of the temperature, strain, strain rate and time elapsed from the end of deformation to the start of quenching parameters of the Thermomechanical Control Processing on the structure and mechanical properties. Simulation of Thermomechanical Control Processing for the definite cross-section of profile by Finite Element Method on the base of the data obtained by the experimental planning method allowed to predict structure and mechanical properties and to develop computer modelling for the different cross-section of rolling profile.

Influence of 3D printing process parameters on the mechanical properties and mass of PLA parts and predictive models

2021 ◽  
Vol 27 (3) ◽  
pp. 487-495
Author(s):  
João Araújo Afonso ◽  
Jorge Lino Alves ◽  
Gabriela Caldas ◽  
Barbara Perry Gouveia ◽  
Leonardo Santana ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Predictive Models ◽  
Prediction Models ◽  
Error Rates ◽  
Planning Method ◽  
Extrusion Temperature ◽  
Compression Tests ◽  
Fused Filament Fabrication ◽  
Content Type ◽  
Experimental Planning

Purpose This paper aims to evaluate the influence of the parameters of the Fused Filament Fabrication (FFF) process on the mechanical properties and on the mass of parts printed in Polylactic Acid (PLA). In addition, the authors developed predictive models for the analysed responses. Design/methodology/approach A full Factorial type of experimental planning method was used to define the conditions for manufacturing parts according to the variation of the construction parameters, extrusion temperature and print speed. Samples were printed for tensile, flexion and compression tests. Their mass was measured. Multiple regression methods, based on power equations, were used to build the forecasting models. Findings It was found that the extrusion temperature was the parameter of greatest influence in the variation of the analysed responses, mainly because it generates behaviour patterns and indirectly demonstrates thermal/rheological characteristics of the material used. Print speed affects responses, however, with variations dependent on part geometry and printer hardware/software. It was possible to establish prediction models with low error rates in relation to the experimental values. Originality/value The study demonstrates a good relation between the use of a structured experimental planning method as the basis for the development of predictive models based on mathematical equations, the same structure of which can be used to describe different responses.

scholarly journals TRENDS AND DETERMINANTS OF DEMOGRAPHIC PROCESSES IN RUSSIA

2021 ◽  
pp. 61-69
Author(s):  
E. N. Grishina ◽  
I. P. Lapteva
Keyword(s):  
Birth Rate ◽  
Population Aging ◽  
Planning Method ◽  
Necessary Condition ◽  
Efficiency Coefficient ◽  
Population Forecast ◽  
Experimental Planning ◽  
Demographic Processes ◽  
The Impact

The article substantiates the need to identify trends in the development of processes demographic in individual countries and regions. The analysis of the determination of demographic processes is a necessary condition for the development of an effective demographic policy. The authors studied the dynamics of the population of the planet as whole, Europe, and Russia over the past 50 years. The assessment of the degree of influence of the measures taken in certain countries of the world on the demographic situation is given. The article deals with both methodological issues of studying the determination of demographic processes, and the results of research based on statistical information. Much attention is paid to the issues of determining the birth rate and mortality. An assessment of the impact of material payments on the birth rate is given. At the same time, the issues of determining migration processes and population aging are not left without attention. To analyze the causes of population migration in the region, the experimental planning method was used. The use of this method allowed us to identify the factors that affect migration processes and to assess the degree of influence of each of them on the level of the migration efficiency coefficient. The study showed the possibility of using the planning method in the study of socio-economic processes. The authors consider three variants of the population forecast of the Russian Federation until 2035, proposed by Rosstat, and assessed possible options for their implementation.

Investigation of ultrasonic extraction by the experimental planning method

1972 ◽  
Vol 6 (4) ◽  
pp. 240-241
Author(s):  
N. S. Shchepilov ◽  
P. N. Makarenko ◽  
A. S. Chernyak
Keyword(s):  
Ultrasonic Extraction ◽  
Planning Method ◽  
Experimental Planning

scholarly journals THEORETICAL ASPECTS OF THE DISPOSAL OF WOOD FIBER WASTE IN AERODYNAMIC MEDIA

2020 ◽  
pp. 475-484
Author(s):  
Natal'ya Geral'dovna Chistova ◽  
Venera Nurullovna Matygulina
Keyword(s):  
Specific Surface ◽  
Technological Process ◽  
Wood Fiber ◽  
Mechanical Effect ◽  
Chemical Additives ◽  
Grinding Method ◽  
Dry Grinding ◽  
Secondary Wood ◽  
Environmental Feasibility ◽  
Physical Phenomena

The paper discusses the results of a study on the use of fundamentally new equipment (rotary knife mill) for the preparation of secondary fiber waste in the air and the possibility of their full use in finished products for various purposes. In order to justify the effectiveness of the preparation and the feasibility of using secondary wood fiber semi-finished products by a dry grinding method, the physical phenomena and regularities of the mechanism for the preparation of secondary wood fiber semi-finished products by the proposed method are determined and investigated, which characterize the technological process of preparation in air and their possible future use as semi-finished products or in the manufacture of finished products products. The process of dissolution of wood fiber waste was studied, the mechanical effect on wood fiber waste due to face-cross cutting (cutting, crushing, flattening, breaking) and aerodynamic phenomena (breaking, collision, dissolution, fibrillation), contributing to the formation of external and internal fibrillation of the secondary wood fiber, is described. increase in specific surface in the absence of high temperatures and pressure, without the addition of chemical additives, without the use of water and steam. The performed studies allow us to propose a new method and system for the preparation of wood fiber waste by dry grinding, justifying their economic and environmental feasibility.

SEM Study of Tension Wood Fiber Morphology and its Effect on Paper Properties

1977 ◽  
Vol 35 ◽  
pp. 308-309
Author(s):  
K. W. Robinson
Keyword(s):  
Tension Wood ◽  
Wood Fiber ◽  
Strength Properties ◽  
Fiber Morphology ◽  
Paper Properties ◽  
Pure Cellulose ◽  
Short Rotation ◽  
Hardwood Trees ◽  
Sem Study

Tension wood (TW) is an abnormal tissue of hardwood trees; although it has been isolated from most parts of the tree, it is frequently found on the upper side of branches and leaning stems. TW has been classically associated with geotropic alignment, but more recently it has been associated with fast growth. Paper made from TW is generally lower in strength properties. Consequently, the paper industries' growing dependence on fast growing, short- rotation trees will result in higher amounts of TW in the final product and a corresponding reduction in strength.Relatively few studies have dealt with the role of TW in the structure of paper. It was suggested that the lower strength properties of TW were due to a combination of factors, namely, its unique morphology, compression failures in the cell wall, and lower hemicellulose content. Central to the unique morphology of the TW fiber is the thick gelatinous layer (G-layer) composed almost entirely of pure cellulose.

The Latin Square Task as a Measure of Relational Reasoning

2020 ◽  
Vol 36 (2) ◽  
pp. 296-302 ◽  
Author(s):  
Luke J. Hearne ◽  
Damian P. Birney ◽  
Luca Cocchi ◽  
Jason B. Mattingley
Keyword(s):  
Brain Imaging ◽  
Response Times ◽  
Latin Square ◽  
Error Rates ◽  
Functional Brain Imaging ◽  
Inspection Time ◽  
Relational Reasoning ◽  
Validity And Reliability ◽  
The Stability ◽  
Test Retest Reliability

Abstract. The Latin Square Task (LST) is a relational reasoning paradigm developed by Birney, Halford, and Andrews (2006) . Previous work has shown that the LST elicits typical reasoning complexity effects, such that increases in complexity are associated with decrements in task accuracy and increases in response times. Here we modified the LST for use in functional brain imaging experiments, in which presentation durations must be strictly controlled, and assessed its validity and reliability. Modifications included presenting the components within each trial serially, such that the reasoning and response periods were separated. In addition, the inspection time for each LST problem was constrained to five seconds. We replicated previous findings of higher error rates and slower response times with increasing relational complexity and observed relatively large effect sizes (η2p > 0.70, r > .50). Moreover, measures of internal consistency and test-retest reliability confirmed the stability of the LST within and across separate testing sessions. Interestingly, we found that limiting the inspection time for individual problems in the LST had little effect on accuracy relative to the unconstrained times used in previous work, a finding that is important for future brain imaging experiments aimed at investigating the neural correlates of relational reasoning.

Station Planning Method of Suburban Railway for Commuters

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Yunlin Guan ◽  
Yun Wang ◽  
Xuedong Yan ◽  
Haonan Guo ◽  
Yan Huang
Keyword(s):  
Planning Method ◽  
Suburban Railway
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