scholarly journals Ground of the modes of agglutination of aspen lead of

Author(s):  
А.Н. Чубинский ◽  
И.В. Коваленко ◽  
Д.С. Русаков ◽  
Г.С. Варанкина

Качество формирования клеевых соединений древесины при склеивании шпона зависит от многих факторов, основными из которых являются плотность и влажность древесины, ее поверхностные свойства, вид клея и его характеристики, режимы склеивания. Фанера, склеенная из осинового шпона по применяемым на практике режимам, характеризуется меньшей прочностью, по сравнению с березовой фанерой. Применение древесины осины в промышленном производстве материалов и изделий ограничено из-за ее низких механических свойств, подверженности поражению коррозионно-деструктивной гнили, отсутствия должного обоснования технологии ее переработки. Невостребованная осина осложняет условия хозяйствования в лесу, ухудшает породный состав древостоев, препятствует восстановлению хвойных пород древесины. Прочность склеивания древесины и прочность фанеры возрастает с увеличением давления прессования, однако приводит к увеличению остаточной деформации и вероятности возникновения «пузырей» в склеиваемом пакете шпона. Поэтому обоснование давление прессования и расхода клея для склеивания шпона на основе свойств и строения древесины осины является актуальной задачей. Снижение давления по закону релаксирующих напряжений позволяет уменьшить давление парогазовой смеси в пакете шпона, уменьшает вероятность разрушения клеевого соединения при снятии внешнего усилия. Одним из эффективных способов повышения прочности клеевого соединения является применение лигносульфонатов в качестве модификатора для синтетических смол. The quality of the formation of adhesive joints when gluing wood veneers depends on many factors, the main ones are the density and moisture content of wood, its surface properties, type of adhesive and its characteristics, bonding modes. Plywood glued veneers of aspen on applied practice modes, characterized by lower strength in comparison with birch plywood. The use of aspen wood in manufacturing of materials and products is limited due to its low mechanical properties, corrosion susceptibility destructive lesion decay, its lack of proper justification processing technology. Unclaimed aspen difficult economic conditions in the forest, degrades the species composition of forest stands and prevents restoration of softwood. The adhesion of wood and plywood strength increases with increasing compaction pressure, however, leads to an increase in permanent deformation, and the likelihood of «bubbles» in the package are glued veneer. That is why the support of the pressing and glue flow pressure for bonding the veneer on the basis of structure and properties of aspen wood is an urgent task. Reducing pressure legally relaxing stress to reduce the pressure of the gas mixture in the veneer package, reduces the probability of failure of the adhesive joint when removing the external force. One effective way of increasing the bonding strength is the use of lignosulfonate as a modifier for synthetic resins.

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Vũ Xuân Hùng

In the process of teaching, technical teaching facilities are both a content and a means of conveying information, they help the lecturer organize and control the students' cognitive activities, in addition, they also help students be interested in learning, practice practical skills from which to form active and creative learning methods. Teaching technology is one of the necessary conditions to help teachers carry out their related work of educating, teaching and bringing up, and intellectual development, arouse the inherent intelligence qualities of students. Currently, the management of technical teaching facilities at the Central Kindergartens College has been carried out on a regular basis and achieved certain results, but in fact, there are still many inadequacies. Finding a number of limitations in the management of teaching technical facilities, thereby proposing solutions to overcome those limitations, improve the efficiency of investment, preservation and use of teaching technical facilities in the trend of Industry Revolution 4.0, improving the quality of teaching at Central Kindergarten Pedagogy colleges in the current period is a very important and urgent task.


Author(s):  
И.В. Коваленко ◽  
М.А. Чубинский ◽  
Д.С. Русаков ◽  
Г.С. Варанкина

Применение древесины осины в промышленном производстве материалов и изделий ограничено из-за ее низких механических свойств, подверженности поражению коррозионно-деструктивной гнили, отсутствием должного обоснования технологии ее переработки. Невостребованная осина осложняет условия хозяйствования в лесу, ухудшает породный состав древостоев, препятствует восстановлению хвойных пород древесины. Древесина осины хуже смачивается водой по сравнению с другими породами. Изучение ее поверхностных свойств и строения на микроуровне представляет безусловный интерес для изучения взаимодействия древесины с водой, жидкими клеящими и защитно-декоративными веществами. Это сложная многопараметрическая задача, решение которой может явиться новым инструментом для обоснования наукоемких технологических процессов сушки, пропитки, склеивания и облагораживания древесины. Истинная поверхность древесины, образованная в результате обработки резанием (лущением, пилением, фрезерованием) значительно больше ее проекции на плоскости в результате разрезания микроструктурных элементов. Неровности на поверхности искажают результаты измерения поверхностных свойств, определяемых на основе угла смачивания. Учитывая то, что размеры стенок клеток меньше размеров полостей, истинная площадь поверхности древесины, в зависимости от вида разреза, может в десятки раз превышать кажущуюся. Ухудшение способности смачиваться объясняет образование на поверхности капель клея, нанесенного на шпон методом вальцевания. При горячем прессовании фанеры в первый момент времени повышается подвижность молекул клея, снижается упругость древесины, поверхность выравнивается, улучшая условия адгезионного взаимодействия связующего и древесины. Для определения истинных характеристик древесины, обоснования расхода клея, способности древесины поглощать жидкость необходимо знать размеры ее микроструктурных элементов и характер их распределения, объем поверхностных полостей. Эффективный радиус полостей древесины осины может быть описан с использованием теории фракталов. The use of aspen wood in manufacturing of materials and products is limited due to its low mechanical properties, corrosion susceptibility destructive lesion decay, its lack of proper justification processing technology. Unclaimed aspen difficult economic conditions in the forest, degrades the species composition of forest stands and prevents restoration of softwood. Wood aspen worse moistened with water compared to other breeds. The study of its structure and surface properties at the micro level is of great interest to study the interaction of wood with water, liquid adhesives and protective-decorative materials. This is the problem whose solution can be a new tool for the study of science-intensive technological processes of drying, impregnation, gluing and surface finishes. Real wood surface, formed by the machining (peeling, sawing, milling) significantly greater its projection on the plane as a result of cutting the microstructural elements. Surface irregularities distort the results of measurement of surface properties which are determined based on the contact angle. Given that the size of the cell walls is less than the size of the cavities, the true surface area of the veneer, depending on the type of incision, may be ten times the apparent. The deterioration of the ability of wetted explains the formation of droplets on the surface of adhesive deposited on the veneer by rolling. When plywood hot pressing at a first time increases mobility of adhesive molecules, decreases the modulus of elasticity of wood, surface is aligned, improving the conditions of interaction of the glue and the wood. To determine the true characteristics of the wood, glue flow study, the ability of wood to absorb liquid it is necessary to know the size of microstructural elements and their distribution, the amount of surface cavities. The effective radius of aspen wood cavities can be described using fractal theory.


Author(s):  
V. E. Dementyev ◽  

The level of confidence in the future is considered as one of the important characteristics of the quality of life. Social and economic well-being depends on what expectations prevail in a society. It is shown that the reduction of interest rates on loans is not a sufficient condition for overcoming investment pessimism. It is indicated that with low capacity utilization, cheap loans can lead to stagnation of industries, contributing to the preservation of the existing structure of used capacities. The quality of coordination of economic activity is considered as one of the factors of business confidence in the future. It is noted that the competitiveness of existing industries has a great impact on the formation of new industries in the economy. It is emphasized that the transition to the system of interactive strategic planning remains an urgent task for our country.


2016 ◽  
Vol 5 (3) ◽  
pp. 61-78
Author(s):  
Magdalena Petrovska ◽  
Aneta Krstevska ◽  
Nikola Naumovski

Abstract This paper aims at assessing the usefulness of leading indicators in business cycle research and forecast. Initially we test the predictive power of the economic sentiment indicator (ESI) within a static probit model as a leading indicator, commonly perceived to be able to provide a reliable summary of the current economic conditions. We further proceed analyzing how well an extended set of indicators performs in forecasting turning points of the Macedonian business cycle by employing the Qual VAR approach of Dueker (2005). In continuation, we evaluate the quality of the selected indicators in pseudo-out-of-sample context. The results show that the use of survey-based indicators as a complement to macroeconomic data work satisfactory well in capturing the business cycle developments in Macedonia.


2021 ◽  
Vol 4 (1) ◽  
pp. 13-29
Author(s):  
Eka Kartika Sari ◽  
Biko Nabih Fikri Zufar

The perception of women as the number two role in society continues to this day. This knowledge has an impact on women's inferiority and subordination. In addition, the conditions of the Covid-19 pandemic have increased the workload for women at home. The workload for women has increased threefold, including earning a living in it. The woman breadwinner in Kampung Kue Rungkut Lor II experienced this during the pandemic. This article uses qualitative research methods and a phenomenological approach, in order to obtain data on the quality of life in the Kampung Kue Rungkut Lor II community. The purpose of this study was to determine descriptively the condition of women breadwinners during the pandemic. As a result, the “Pembatasan Sosial Berskala Besar” (PSBB) affected the economic conditions in the Kampung Kue Rungkut Lor II community, and women also experienced three times more workload than men at home. The pandemic has actually added to the exploitation and oppression of women in the Kampung Kue Rungkut Lor II community. Therefore, it is necessary to have further research on the quality of life of women breadwinners in Kampung Kue Rungkut Lor II before the pandemic to find out the differences in the quality of life of women breadwinners in the same location.


2021 ◽  
Vol 939 (1) ◽  
pp. 012044
Author(s):  
A J Shokirov ◽  
S S Lapasov ◽  
K J Shokirov

Abstract At present, scientific research is underway to further develop vegetable growing in the secondary crop, in particular to further increase the yield and quality of white cabbage, to select a system of planting time-sowing scheme that maximizes the biological productivity of varieties, and to apply the most optimal standards of fertilization and irrigation. In this regard, the urgent task remains to determine the optimal varieties of cabbage that can be grown in repeated crops, their optimal planting scheme, timing, development and implementation of optimal standards for each variety of mineral fertilizers and irrigation, and its solution is large-scale throughout the country. Besides that a number of problematic issues are addressed, which could allow to get high and high-quality harvest of white cabbage in repeated sowing in grain-free areas.


World Science ◽  
2020 ◽  
Vol 1 (3(55)) ◽  
pp. 17-25
Author(s):  
Нода О. М. ◽  
Закора О. В. ◽  
Рязанова О. Ю.

Modern consumers attach increasing importance to tactile sensations and the general perception of the surface of fabrics, therefore, the study of the structure and properties of woven textures is an urgent task of textile production. In textile technologies, organoleptic research methods are used mainly, which give a subjective visual and tactile assessment of the surface of the tissues. Therefore, there was a need to develop an instrumental method for determining the texture of fabrics, which was implemented on the basis of the existing method for studying the texture of hard surfaces. It is based on the idea of creating a constant mode of illumination of the object of observation, which is a tissue sample. The proposed method is based on the use of a special optical device for determining the qualitative and quantitative characteristics of textures and is a viewing chamber containing a mechanism for changing the lighting mode and a mechanism for capturing tissue images. For an objective assessment of the state of the surface of the tissues, the invoice indicator is calculated − the invoice coefficient. The implementation of the developed method allows to increase the efficiency of the processes of design-design of fabrics, to predict the appearance of fabrics and to ensure compliance with the texture of the fabric of the model of the garment.


Author(s):  
K. Pavlov ◽  
◽  
S. Ilyin ◽  

The article presents the author's formalized approach to the formation and evaluation of the system of indicators for conducting electronic business in static and dynamic states, contributing to the detailed disclosure of the interaction of factor and resultant parameters by which organizations will be able to justify the decisions taken by entrepreneurs in modern economic conditions to ensure the best final and intermediate benchmarks for themselves. The purpose of the study is aimed at creating a reliable system that integrates general and private indicators of e-business for the subsequent balancing of results, costs and extraction of marginal financial benefits. The objectives of the study are focused on annotating the activities of organizations that operate and implement business processes in the current economic environment, as well as integrating indicators based on it that reflect static and dynamic cause-and-effect relationships in the field of commerce. The methods for performing the research were chain substitutions supplemented with mathematical analysis, which will allow organizations to obtain complete and reliable information about the quality of e-business. The work is intended for managers and specialists of commercial organizations, educators and scientists engaged in the study of the economics of entrepreneurship.


2021 ◽  
pp. 52-57
Author(s):  
D. D. Balandin ◽  
O. L. Lyubimtseva

Ensuring and improving the quality of products is currently an urgent task implemented through product quality management. In connection with the spread of the COVID-19 virus, Rospotrebnadzor recommends the use of quartz lamps when disinfecting premises. The article discusses the issue of assessing the quality of a device for home use of a quartz ultraviolet irradiator OUFK-01. In accordance with the WHO recommendations, the irradiation indicator became the main one for the study. The study was carried out using an ANOVA model with several iterations. Purpose of the study: to study the variability of the irradiance index in different UV ranges depending on the source of UV radiation (UV lamp) of the ultraviolet irradiator OUFK-01. The main advantage of the analysis of variance was used – the ability to consider the interaction of various factors. The conclusions that were formulated based on the results of analysis of variance suggest that the quality of the OUFK-01 irradiator has changed. Data processing was carried out using the MS EXCEL software package. The article provides a rationale for what is meant by “quality improvement”, namely, in order not to violate the bactericidal effect, it is necessary to reduce the UV-A and UV-B ranges to acceptable values, since the effect of UV-C rays has not been fully studied, then the irradiance should be increased to the permissible wavelength range. A comparative analysis of successively modified products showed that the quality of the device increased with the replacement of the UV lamp.


1998 ◽  
Vol 79 (6) ◽  
pp. 453-455
Author(s):  
A. N. Galiullin ◽  
R. Z. Nurkhamitov

The data of public opinion poll, expert estimation of activities of treatment and prophylactic institutions under transition to the budget and insurance medicine are given. It is shown that treatment and prophylactic institutions are not ready to work in current economic conditions. It is concluded that there are unused reserves for improving the quality of medical care in health service management in current economic conditions.


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