scholarly journals THEORETICAL FOUNDATIONS OF OBTAINING MODIFIED WOOD

2018 ◽  
Vol 8 (1) ◽  
pp. 150-157 ◽  
Author(s):  
Татьяна Курьянова ◽  
Tatyana Kuryanova ◽  
Алексей Платонов ◽  
Aleksey Platonov ◽  
Марина Михеевская ◽  
...  
Keyword(s):  
Dimensional Stability ◽  
Raw Materials ◽  
Similarity Criteria ◽  
Railway Track ◽  
High Tech ◽  
Operational Characteristics ◽  
Natural Wood ◽  
Coniferous Wood ◽  
Physical Phenomena ◽  
Modified Wood

The element of the upper structure of the railway track are sleepers, which are made mainly of wood. Wooden sleepers from natural wood have a number of disadvantages. Reduce the disadvantages of sleepers made of natural wood is possible if their manufacture to use modified wood myag-kih hardwood, which by pressing will exceed the strength of the sleepers made of natural Dre-spring and its physical and mechanical characteristics is not inferior to the sleepers made of natural coniferous wood. However, one of the disadvantages of modified wood is its ability to change the size and shape with increasing humidity. Therefore, there is a need to create a new high-tech re-surdobarokamere the production of railway sleepers of the modified wood with improved ex-operational characteristics (durability, bio-logical stability, dimensional stability, wear resistance), exceeding the existing production. To increase the service life of wooden sleepers, increase their biostability and dimensional stability, raw materials for the production of sleepers must be impregnated with the composition of antiseptic and stabilizer, i.e. to conduct thermomechanical modification of wood. As raw materials it is possible to use wood of soft deciduous breeds of a birch and an aspen. Depending on the degree of pressing the sleepers of these species will exceed the strength of the sleepers of pine wood. But at the same time all properties of wood remain (damper, dielectric and others). Development of wood modification technology is possible on the basis of analysis of physical phenomena underlying technological operations. With this purpose, the theoretically calculated curves of heating of the billet in the section of the oily liquid, made on the basis of similarity criteria and on the basis of the physical phenomena of heat and mass transfer calculated duration of drying preparations. Accepted methods of impregnation, loading and relieving of the pressure during compaction

scholarly journals Condition of production and operation of railway sleepers from various materials

2018 ◽  
Vol 7 (4) ◽  
pp. 157-166 ◽  
Author(s):  
Татьяна Курьянова ◽  
Tatyana Kuryanova ◽  
Алексей Платонов ◽  
Aleksey Platonov ◽  
Марина Михеевская ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Physical And Mechanical Properties ◽  
Railway Track ◽  
Natural Wood ◽  
Coniferous Wood ◽  
And Performance ◽  
Whole Life Cycle ◽  
Production And Operation ◽  
Modified Wood

Sleepers are elements of the upper structure of the railway track. When choosing a material for the manufacture of sleepers, we are based on such basic factors as cost for the whole life cycle and performance characteristics. In connection with the depletion of wood stocks in the world and the short life of wooden sleepers, the process of using sleepers made of reinforced concrete, metal and plastic goes intensively. The service life of pine sleepers is no more than 12-15 years, reinforced concrete sleepers are about 30-50 years old, plastic ones are up to 40 years old, and metal ones are 50-60 years old. However, wooden sleepers differ in the least cost, they practically do not have restrictions on the laying areas, and in some cases have a clear advantage over other materials. Reinforced concrete, metal and plastic sleepers are more expensive than wooden ones, have a longer payback period and are recommended to be laid on roads with high freight intensity, where they can pay off as quickly as possible. It is possible to reduce the shortcomings of sleepers made of natural wood, using modified hardwood for their manufacture, which, by pressing, will be stronger than the sleepers made of natural wood, which, in its physical and mechanical properties, is not inferior to sleepers made of natural coniferous wood. However, a certain disadvantage of the modified wood is its ability to change size and shape with increasing humidity. Stabilization of sizes and forms of modified wood can be increased by impregnating it with the composition of antiseptic with stabilizer. The predicted service life of sleepers from modified wood can be significantly higher than that of wooden sleepers made of natural coniferous wood.

High-tech methods for processing meat raw materials

2020 ◽  
pp. 20-24
Author(s):  
M.G. Baryshev ◽  
A.A. Zaporizhzhya ◽  
G.I. Kasyanov
Keyword(s):  
Raw Materials ◽  
High Tech

scholarly journals Review of Functional Treatments for Modified Wood

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 327
Author(s):  
Morwenna J. Spear ◽  
Simon F. Curling ◽  
Athanasios Dimitriou ◽  
Graham A. Ormondroyd
Keyword(s):  
High Performance ◽  
Responsive Materials ◽  
Wood Modification ◽  
Wide Range ◽  
Natural Wood ◽  
Impregnation Modification ◽  
New Applications ◽  
New Generation ◽  
Dimensional Instability ◽  
Modified Wood

Wood modification is now widely recognized as offering enhanced properties of wood and overcoming issues such as dimensional instability and biodegradability which affect natural wood. Typical wood modification systems use chemical modification, impregnation modification or thermal modification, and these vary in the properties achieved. As control and understanding of the wood modification systems has progressed, further opportunities have arisen to add extra functionalities to the modified wood. These include UV stabilisation, fire retardancy, or enhanced suitability for paints and coatings. Thus, wood may become a multi-functional material through a series of modifications, treatments or reactions, to create a high-performance material with previously impossible properties. In this paper we review systems that combine the well-established wood modification procedures with secondary techniques or modifications to deliver emerging technologies with multi-functionality. The new applications targeted using this additional functionality are diverse and range from increased electrical conductivity, creation of sensors or responsive materials, improvement of wellbeing in the built environment, and enhanced fire and flame protection. We identified two parallel and connected themes: (1) the functionalisation of modified timber and (2) the modification of timber to provide (multi)-functionality. A wide range of nanotechnology concepts have been harnessed by this new generation of wood modifications and wood treatments. As this field is rapidly expanding, we also include within the review trends from current research in order to gauge the state of the art, and likely direction of travel of the industry.

Chemical improvement of surfaces. Part 3: Covalent modification of Scots pine sapwood with substituted benzoates providing resistance to Aureobasidium pullulans staining fungi

Holzforschung ◽  
2015 ◽  
Vol 69 (5) ◽  
pp. 595-601 ◽  
Author(s):  
Jan C. Namyslo ◽  
Dieter E. Kaufmann ◽  
Carsten Mai ◽  
Holger Militz
Keyword(s):  
Scots Pine ◽  
Aureobasidium Pullulans ◽  
Covalent Modification ◽  
Attenuated Total Reflection ◽  
Chemically Modified ◽  
Covalently Bonded ◽  
Blue Stain ◽  
Natural Wood ◽  
The Individual ◽  
Modified Wood

Abstract The development of appropriate chemical precursors that can covalently functionalize natural wood aims at efficient restriction of deterioration. Biological staining experiments were performed with veneer pieces made of sapwood of Scots pine (Pinus sylvestris L.) that had previously been chemically modified with substituted benzoates. Based on the recently published protocol on esterification of wood by means of 1H-benzotriazole activation, the quantity of covalently bonded organomaterials (QCOs), a recently defined advantageous value considering the individual molecular weight of the functionalizing organochemical groups, was obtained in the range of 0.9–1.5 mmol g-1. The modified wood was analyzed by attenuated total reflection IR spectroscopy. Modification with three electronically different benzoates clearly reduced the colonization of the specimen’s surfaces by the blue stain fungus Aureobasidium pullulans but did not fully prevent it. The degree of colonization appeared to decrease with increasing QCO values of the modification agents but apparently did not strongly depend on the additional functionality of the benzoate.

Hygroscopic properties of thermally modified false Iroko [Antiaris toxicara (Lesch)]

2021 ◽  
Vol 18 (1) ◽  
pp. 51-57
Author(s):  
F.A. Faruwa ◽  
K. Duru
Keyword(s):  
Weight Loss ◽  
Dimensional Stability ◽  
Thermal Process ◽  
Colour Change ◽  
Wood Properties ◽  
Thermal Modification ◽  
Hygroscopic Properties ◽  
Different Temperatures ◽  
Thermally Modified Wood ◽  
Modified Wood

The study investigated the use of thermal modification to improve the hygroscopic properties of False Iroko [Antiaris toxicaria (Lesch)]. Samples of Antiaris toxicara Lesch wood were subjected to thermal modification in a furnace at temperatures of 160, 180 and 200°C for 30 and 60 minutes. Results showed that wood properties were improved with exposure to different temperatures. Subsequent to the thermal process, a colour change from pale yellow to darkish brown was observed progressively with increase in temperature, accompanied by a weight loss in the range of 12.08% to 23.67%. The outcome of these treatments resulted in a decrease in volumetric swelling and increase in dimensional stability of modified wood; this can be attributed to observed decrease in moisture intake. The thermal modification of Antiaris toxicara Lesch wood affected the dimensional stability properties. Thus, due to significant changes via modification carried out on the selected species which is classified as lesser utilized wood species, lesser utilized wood,Antiaristoxicara Lesch wood is recommended for use due to its efficient dimensional stability after modification . keywords:, Thermally modified wood ;False Iroko

OPTIMIZATION OF DOSAGES OF NON-TRADITIONAL RAW MATERIALS IN THE FORMULATION OF PREVENTIVE ORIENTATION BREAD

2021 ◽  
Author(s):  
Е.И. ПОНОМАРЕВА ◽  
С.И. ЛУКИНА ◽  
А.А. ЖУРАВЛЕВ ◽  
С.М. ПАВЛОВСКАЯ
Keyword(s):  
Dimensional Stability ◽  
Specific Volume ◽  
Raw Materials ◽  
Biologically Active ◽  
Regression Equations ◽  
Technical Specifications ◽  
Optimal Values ◽  
Method Of Production ◽  
Statistical Criteria

Исследовано влияние сочетания нетрадиционных видов сырья – жидкого виноградного сахара и куркумы на качество хлеба из пшеничной муки. Проведена оптимизация дозировок этих рецептурных компонентов по выходным параметрам – удельному объему и формоустойчивости готового изделия. Оптимизацию рецептурного состава хлеба проводили с использованием методов математической статистики и дифференциального исчисления. Построены математические модели в виде регрессионных уравнений. Обработку экспериментальных данных выполняли по статистическим критериям Стьюдента, Кохрена и Фишера при доверительной вероятности 0,95. Дана графическая интерпретация регрессионных уравнений. Оптимизацию рецептурного состава хлеба проводили методом свертывания частных критериев в обобщенный аддитивный критерий. Определены оптимальные значения факторов: дозировка, % к массе муки, жидкого виноградного сахара – 2,50, куркумы – 2,75, обеспечивающие получение изделий с наилучшим сочетанием значений удельного объема и формоустойчивости. На основе полученных данных разработана рецептура и способ производства хлеба «Мерита» профилактической направленности (ТУ 9110–515–02068108–2019), характеризующегося улучшенным качеством и повышенной пищевой ценностью за счет дополнительного внесения биологически активных нутриентов. The influence of a combination of non-traditional raw materials – liquid grape sugar and turmeric on the quality of wheat flour bread has been studied. Optimization of the dosages of these prescription components according to the output parameters – specific volume and dimensional stability of the finished product was carried out with using methods of mathematical statistics and differential calculus. Mathematical models in the form of regression equations are constructed. The experimental data were processed according to the statistical criteria of Student, Cochran, and Fisher with a confidence probability of 0,95. Optimization of the formulation composition of bread was carried out by the method of folding partial criteria into a generalized additive criterion. The optimal values of the factors are determined: dosage, % by weight of flour, liquid grape sugar –2,50, turmeric – 2,75, ensuring the production of products with the best combination of specific volume and dimensional stability. On the basis of the obtained data, the formulation and method of production of bread «Merita» of a preventive orientation (Technical specifications 9110–515–02068108–2019) were developed. The product has improved quality and increased nutritional value due to the additional introduction of biologically active nutrients.

High-tech export of the Russian Federation: current state and key trends

2021 ◽  
pp. 679-691
Author(s):  
Natalya Jurievna Rodigina ◽  
Liudmila Anatolievna Obuhovskaya ◽  
Oxana Eduardovna Kirtoake
Keyword(s):  
Russian Federation ◽  
Raw Materials ◽  
High Technology ◽  
Machine Building ◽  
High Tech ◽  
Business Climate ◽  
Goods And Services ◽  
Consulting Services ◽  
Technology Services ◽  
The Russian Federation

Nowadays countries are focused on the development of high-techology industries, which will allow them to increase their competitiveness. However, Russia specializes in the export of raw materials and goods with a low degree of processing. In this regard, one of the key aims of Russia is to develop high-technoligy production and expand its presence in the markets of goods with a high degree of processing. The abstract reveals the export of high-technology goods and services. The article analyzes position of the Russian Federation in the world market of high-technology goods and services. Russia specializes in the export of such high-technology goods as aerospace production, nuclear technologies and weapons. Russia specializes in the export of such high-technology services as telecommunications, computer and information services, professional and consulting services, engineering services, services in technical fields and in the field of architecture. Special attention is paid to the promising directions of high-technology exports, the importers of Russian high-technology products and trends in exports and imports of high-technology goods as well as trends in exports of high-technology services. For example, Russia should develop exports of such high-technology goods as jet engines, nuclear reactors and their components, fuel rods, nuclear technologies and weapons. The most promising export directions from the machine-building industry are vehicles and equipment production. Russia should focus on the export of such high-technology services as information, telecommunications, computers, professional and consulting services. To stimulate the export of these services, it is necessary to create a favorable business climate in Russia, eliminate the shortage of specialists in the field of ICT, as well as improve the quality of their training.

Mass spectrometric study of the leak tightness of products made of technical sintered beryllium

2021 ◽  
Vol 87 (4) ◽  
pp. 26-31
Author(s):  
A. N. Fokanov ◽  
V. F. Podurazhnaya ◽  
A. V. Tebyakin
Keyword(s):  
Raw Materials ◽  
Flaw Detection ◽  
Mass Spectrometric Study ◽  
Radiation Energy ◽  
Radiation Detectors ◽  
Mass Spectrometric ◽  
High Tech ◽  
Vacuum Equipment ◽  
X Ray ◽  
Leak Tightness

Beryllium products exhibiting a low level of absorption of the radiation energy are widely used in scientific instrumentation design (x-ray technology, radiation detectors, etc.). We present the results of studying the leak tightness of products (disks, plates) made of technical sintered beryllium of standard purity and foil obtained by «warm» rolling from high-purity beryllium. The relevant standards and requirements for testing are given. The leak tightness control was performed using mass spectrometric helium leak detectors with forevacuum backing pumps (oil and dry diaphragm pumps) and specialized vacuum equipment. The parameters of tightness of samples made of technical sintered beryllium were determined. The level of the helium signal during blowing was (0.6 – 7.4) × 10–11 Pa · m3/sec, which corresponds to the tightness standard of foreign analogues and matches the requirements of domestic manufacturers of x-ray equipment. The data spread tended to increase due to the growth of the background value. The obtained results can be used to improve high-tech equipment intended for flaw detection, medical devices, rapid analysis of ore raw materials, radiation safety equipment, etc.

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