scholarly journals Scientific and Experimental Substantiation of the Key Geometric and Kinematic Parameters of Vibrocutting Machines

2021 ◽  
Author(s):  
Artur Altunyan ◽  
Arshaluys Tarverdyan
Keyword(s):  
Agricultural Production ◽  
Laboratory Experiments ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Common Reed ◽  
Kinematic Parameters ◽  
Power Characteristics ◽  
Processed Material ◽  
Production Complex ◽  
Experimental Substantiation

Abstract The process of cutting with a blade is largely applied in technological equipment used in the agricultural production complex and is used to process raw materials with different physical and mechanical properties. Nonetheless, the relation between the parameters of processing with vibroblade and the rheological properties of the processed material is insufficiently studied, while it is an important issue of practical significance.As a result of laboratory experiments, it became possible to obtain the power characteristics of vibrocutting of common reed, establish an optimal combination of factors: vibration amplitude, frequency and the speed of the blade delivery to ensure the minimum vibro-cutting force. As a desirable kinematic regime, 𝐾 =𝑉/𝑉𝜏 , the following relation of speed of delivery and vibration speed of the toothed blade: ≅ 0.004.

scholarly journals Geometric and kinematic parameters of vibrating knife in the development of cutting machines

2021 ◽  
Vol 52 (3) ◽  
Author(s):  
Artur Altunyan ◽  
Arshaluys Tarverdyan
Keyword(s):  
Vibration Amplitude ◽  
Raw Materials ◽  
Functional Relation ◽  
Physical And Mechanical Properties ◽  
Common Reed ◽  
Great Depth ◽  
Kinematic Parameters ◽  
Power Characteristics ◽  
Agricultural Equipment ◽  
Feeding Speed

The process of cutting with a blade is largely applied in agricultural equipment and is used to process raw materials with different physical and mechanical properties. Nonetheless, the functional relation between the kinematic parameters of a vibroblade and the crucial power parameters of the vibration processing has not yet been studied in great depth so far. This type of studies is essential to create databases for further investigation and design of novel cutting machinery or technologies to ensure effective processing of vibrocutting. Our objective was to obtain the power characteristics of vibrocutting through laboratory experiments [using the example of vibrocutting of common reed (Phragmites australis)] and define the combination of factors (i.e., vibration amplitude, frequency and the blade feeding speed) at the minimum cutting force. The following relation of the blade feeding speed (V) and vibration speed of the toothed blade (Vt) has been established as optimal kinematic regime: K≅0.004. Tests have indicated that use of toothed blades for vibrocutting of the raw products of plant origin offers a greater advantage over the blades with flat edges. An optimal cutting regime, when energy expenses are at a minimum, was ensured with the following parameters of the vibroblade: vibration amplitude: 14 mm, frequency: 33.32 s–1, the blade feeding speed: 7.5×10–3 m.

METHODOLOGICAL APPROACHES TO SEARCH FOR RESERVES OF DECREASING COSTS IN THE BRANCHES OF AGRICULTURAL PRODUCTION

2019 ◽  
Keyword(s):  
Agricultural Production ◽  
Raw Materials ◽  
Cost Calculation ◽  
Cattle Breeding ◽  
Method Of Calculation ◽  
Prime Cost ◽  
Dairy Cattle Breeding ◽  
Methodological Approaches ◽  
Definition Of ◽  
Qualitative Characteristics

In this article approaches to search for reserves of decrease in cost of agricultural production are considered. The methods of cost calculation of dairy cattle breeding products used at the studied enter-prise are analysed, short characteristic of the standard method offered by the Ministry of Agriculture is given, and calculations of alternative options are also carried out. Today creation of accounting of a production unit is very important so that not only weight units must be considered in it, but also the quali-tative structure of products must be reflected. Definition of qualitative characteristics and technological properties by production of milk which depend on use purposes can be an example. The raw materials consumption on a unit of production and its quality and also firmness of storage depends on technologi-cal properties of milk. At calculation of prime cost taking into account qualitative characteristics for cal-culation milk in terms of basic fat content undertakes. The method of calculation of prime cost consider-ing qualitative characteristics is the most expedient as prime cost of 1 c of milk unlike the operating tech-nique is lower. In the article analytical methods of reserves calculation for decrease in prime cost taking into account various factors are proved. The revealed reserves will allow an enterprise to expand its in-vestment opportunities in the future, they will give an additional incentive of modernization of the worn-out machinery and equipment in branches of agriculture.

scholarly journals Alkali-Activated Zeolite 4A Granules—Characterization and Suitability Assessment for the Application of Adsorption

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 360
Author(s):  
Pauls P. Argalis ◽  
Laura Vitola ◽  
Diana Bajare ◽  
Kristine Vegere
Keyword(s):  
Compressive Strength ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Morphological Properties ◽  
Solid Ratio ◽  
Suitability Assessment ◽  
Bet Analysis ◽  
Zeolite 4A ◽  
Compressive Strength Test ◽  
Alkali Activated

A major problem in the field of adsorbents is that binders (kaolin clay, bentonite) introduced to bind zeolites and ensure the needed mechanical strength, are not able to sorb gases like CO2 and N2, and decrease the overall adsorption capacity. To solve this problem, one of the pathways is to introduce a binder able to sorb such gases. Thus, in this study, the physical and mechanical properties of a novel binder based on metakaolin and its composite with zeolite 4A in the granular form were studied. Metakaolin was used as a precursor for alkali-activated binder, which was synthesized using an 8M NaOH activation solution. Raw materials were characterized using granulometry, X-ray diffraction (XRD), and differential thermal analysis (DTA); and final products were characterized using density measurements, a compressive strength test, XRD, Brunauer–Emmett–Teller (BET) analysis, and scanning electron microscopy (SEM). Alkali-activated metakaolin was found to be efficient as a binding material when data for morphological properties were analyzed. A relationship was observed—by increasing the liquid-to-solid ratio (L/S), compressive strength decreased. Zeolite granule attrition was higher than expected: 2.42% and 4.55% for ZG-0.8, 3.64% and 5.76% for ZG-1.0, and 2.73% and 4.85% for ZG-1.2, measured at 4 and 5 atmospheres, respectively.

scholarly journals Study of the Incorporation of Biomass Bottom Ash as a Filler for Discontinuous Grading Bituminous Mixtures with Bitumen Emulsion

2021 ◽  
Vol 11 (8) ◽  
pp. 3334
Author(s):  
Jorge Suárez-Macías ◽  
Juan María Terrones-Saeta ◽  
Francisco Javier Iglesias-Godino ◽  
Francisco Antonio Corpas-Iglesias
Keyword(s):  
Raw Materials ◽  
Bottom Ash ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Waste Biomass ◽  
Bituminous Mixtures ◽  
Bitumen Emulsion ◽  
Main Disadvantage ◽  
Physical And Chemical ◽  
And Chemical Properties

Energy consumption, because of population development, is progressively increasing. For this reason, new sources of energy are being developed, such as that produced from the combustion of biomass. However, this type of renewable energy has one main disadvantage, the production of waste. Biomass bottom ash is a residue of this industry that currently has not much use. For this reason, this research evaluates its use as a filler in bituminous mixtures, since this sector also has a significant impact on the environment, as it requires large quantities of raw materials. With this objective, first, the physical and chemical properties of biomass bottom ashes were evaluated, verifying their characteristics for their use as filler. Subsequently, bituminous mixtures were conformed with biomass bottom ash as filler, and their physical and mechanical properties were analyzed through particle loss and Marshall tests. The results of these tests were compared with those obtained with the same type of mixture but with conventional and ophite aggregates. This study confirmed that biomass bottom ash was viable for use as a filler, creating mixtures with a higher percentage of bitumen, better mechanical behavior, and similar physical properties. In short, more sustainable material for roads was obtained with waste currently condemned to landfill.

Adhesives for the Installation of Cast Basalt Elements on Metal and Comparison of Properties when Using Different Types of Fillers

2021 ◽  
Vol 898 ◽  
pp. 35-41
Author(s):  
Jakub Hodul ◽  
Tomáš Žlebek ◽  
Lenka Mészárosová ◽  
Aleš Jakubík ◽  
Rostislav Drochytka
Keyword(s):  
Construction Industry ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Mineral Admixtures ◽  
Maximum Efficiency ◽  
Organic Additives ◽  
Metal Base ◽  
Secondary Raw Materials ◽  
Ecological Benefit ◽  
Different Types

The polymeric adhesives for the installation of basalt elements on a metal base are designed primarily for environments with increased chemical and mechanical stress. They are composed of polymer resins (epoxy, polyurethane) as binders, as well as organic additives and mineral admixtures that mainly fulfill the function of filler. In all sectors of today's construction industry, maximum efficiency in the production of materials is required for sustainability purposes, which, however, must never be at the expense of the quality or the required performance. Due to these requirements, great emphasis is placed on the maximum use of secondary raw materials. Talc is used as the primary filler for polymer adhesives. Sawdust, tire rubber, and fly ash are used as secondary raw materials. The use of these in building supplies can positively affect some physical and mechanical properties of polymeric adhesives. Also, the use of secondary raw materials has the above-mentioned ecological benefit. Basic properties, such as bulk density and adhesion to both metallic and basalt elements, were monitored. The details of the cohesion of the adhesive with the bonded material, as well as the distribution of secondary raw materials in the polymer matrix, were assessed microscopically.

Research on Simulation Test of Coal Similar Material

2013 ◽  
Vol 850-851 ◽  
pp. 847-850 ◽  
Author(s):  
Lin Chao Dai
Keyword(s):  
Compressive Strength ◽  
Raw Materials ◽  
Similarity Theory ◽  
Design Method ◽  
Uniform Design ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Similar Material ◽  
Cement Ratio ◽  
Water Cement Ratio

In order to study the coal and gas outburst similar simulation experiment, coal similar material was made up based on the similarity theory. Based on the previous similar material study, the cement, sand, water, activated carbon and coal powder was selected as the raw material of similar material. Meanwhile similar material matching program with 5 factors and 6 levels was designed by using Uniform Design Method. And the physical and mechanical properties of the similar material compressive strength was measured under different proportions circumstances. The relationship between similar material and the raw materials was analyzed. The results show that choosing different materials can compound different similar materials with different requirements. And the water-cement ratio plays a decisive influence on the compressive strength of similar material. The compressive strength of similar material decreases linearly when the water-cement ratio increases.

Labor Acquisition and Social Conflict on the Colombian Frontier, 1850–1936

1984 ◽  
Vol 16 (1) ◽  
pp. 27-49 ◽  
Author(s):  
Catherine LeGrand
Keyword(s):  
Nineteenth Century ◽  
Latin America ◽  
Agricultural Production ◽  
World Economy ◽  
Raw Materials ◽  
Mineral Resources ◽  
Significant Shift ◽  
Foreign Markets ◽  
Latin Americans ◽  
The World

Exporters of raw materials under Iberian rule, the nations of Latin America continued to perform a similar role in the world economy after Independence. In the nineteenth century, however, a significant shift occurred in the kind of materials exported. Whereas in colonial times the great wealth of Latin America lay in her mineral resources, particularly silver and gold, aster 1850 agricultural production for foreign markets took on larger importance. The export of foodstuffs was not a new phenomenon, but in the nineteenth century the growth in consumer demand in the industrializing nations and the developing revolution in. transport much enhanced the incentives for Latin Americans who would produce coffee, wheat, cattle, or bananas for overseas markets.

scholarly journals A Review of the Geomechanics Aspects in Space Exploration

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7522
Author(s):  
Dariusz Knez ◽  
Mohammad Ahmad Mahmoudi Zamani
Keyword(s):  
Plate Tectonics ◽  
Laboratory Experiments ◽  
Research Study ◽  
Space Exploration ◽  
Physical And Mechanical Properties ◽  
Primary Objective ◽  
Water Extraction ◽  
Scientific Investigations ◽  
Operational Constraints ◽  
Comprehensive Reference

From the 2000s onwards, unprecedented space missions have brought about a wealth of novel investigations on the different aspects of space geomechanics. Such aspects are related to the exploratory activities such as drilling, sampling, coring, water extraction, anchoring, etc. So far, a whole range of constitutive research projects on the plate tectonics, morphology, volcanic activities and volatile content of planetary bodies have been implemented. Furthermore, various laboratory experiments on extraterrestrial samples and their artificial terrestrial simulants are continually conducted to obtain the physical and mechanical properties of the corresponding specimens. Today, with the space boom being steered by diverse space agencies, the incorporation of geomechanics into space exploration appreciably appears much needed. The primary objective of this article is to collate and integrate the up-to-date investigations related to the geomechanical applications in space technologies. Emphasis is given to the new and future applications such as planetary drilling and water extraction. The main impetus is to provide a comprehensive reference for geoscience scientists and astronauts to quickly become acquainted with the cutting-edge advancements in the area of space geomechanics. Moreover, this research study also elaborates on the operational constraints in space geomechanics which necessitate further scientific investigations.

scholarly journals Using Oil Sludge in the Production of Lightweight Bricks

2021 ◽  
Vol 135 (4) ◽  
pp. 40-45
Author(s):  
V. Z. Abdrakhimov ◽  
◽  
E. S. Abdrakhimova ◽  
Keyword(s):  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Calorific Value ◽  
Oil Sludge ◽  
Anthropogenic Factors ◽  
Geological Exploration ◽  
Efficient Utilization ◽  
Burn Out ◽  
Class B ◽  
The Impact

Efficient utilization of multi-tonnage oil sludge is one of the most pressing environmental problems. Since natural raw materials are currently depleted, it is necessary to involve oil sludge in the production turnover for the production of lightweight bricks. At the same time, the costs of geological exploration, construction and operation of quarries are excluded, and significant land plots are exempt from the impact of negative anthropogenic factors. Waste from oil production with an increased content of calorific value is advisable to use not only as a thinning agent, but also as burn-out additives for the production of thermal insulation materials, which include lightweight bricks. A lightweight brick, which belongs to class B with high physical and mechanical properties, was obtained.

scholarly journals Food security issues in the economic security system of the Republic of Armenia

2021 ◽  
Vol 36 ◽  
pp. 08004
Author(s):  
M.G. Manucharyan
Keyword(s):  
Food Security ◽  
Rural Communities ◽  
Agricultural Production ◽  
Food Production ◽  
Food System ◽  
Raw Materials ◽  
Economic Security ◽  
Security Level ◽  
Poverty Level ◽  
The Republic

One of the most important components of national security is food security. The country's food security is mainly ensured through the development of agriculture, food production and food import systems. The main problems of the development of the agri-food system of the republic were the increase of the level of provision of the population with food, the increase of the level of economic protection of the country, which, first of all, requires an increase of agricultural production to provide the population with locally produced food products, raw materials to the processing industry as much as possible, as well as to increase export volumes. The main goal of the research is to develop and outline the ways of further development of the RA food self-sufficiency based on the development of agricultural production. Based on the analysis of the current situation in the agricultural market, to propose a set of economic development measures, which will contribute to the increase of the food security level, the development of the agri-food system, the reduction of the poverty level of the rural communities. The research substantiated the preconditions for further growth of agricultural production, as a result of comprehensive studies and analyzes, the main directions of improving food production and increasing efficiency were outlined, which conditioned the scientific novelty.

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