scholarly journals Regularities in the distribution of granulometric composition of tuff while crushing

2021 ◽  
Vol 15 (1) ◽  
pp. 66-74
Author(s):  
Yevhenii Malanchuk ◽  
Viktor Moshynskyi ◽  
Petro Denisyuk ◽  
Zinovii Malanchuk ◽  
Andriy Khrystyuk ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Granulometric Composition ◽  
Water Saturation ◽  
Raw Materials ◽  
Product Yield ◽  
Sample Weight ◽  
Ore Processing ◽  
Technological Indices ◽  
Definition Of ◽  
Practical Implications

Purpose is to analyze distribution of granulometric composition of tuff as well as ultimate composition and identify dependence of its softening in the process of water saturation based upon a set of experiments to assess raw materials importance of the mineral. Methods. Laboratory experiments were carried out to determine ultimate composition of tuff extracted from different open pits of the region. Methods of mathematical statistics were applied to derive analytical dependences describing the tuff softening in the process of water saturation. The dependences denote logarithmic nature of the saturation increase along with the increase in the sample weight. Findings. It has been determined that tuff is a valuable mineral rather than basalt extraction waste. Thus, tuff needs both mining and complex approaches for processing and extracting of useful metals and silicates. Analytical dependences of tuff softening during water saturation have been defined. The dependences denote logarithmic nature of the saturation increase based upon a sample weight increment. Magnetic susceptibility of tuff, turned on magnetic field induction, has been identified. Dependences of distribution of technological indices (i.e. product yield, copper content and yield) in terms of granulometric-size class have been identified; the basic factors for crushing process have been determined; and regression dependences of grinder efficiency upon the input factors have been derived. Regression model of a crushing process of a general technological scheme of ore processing has been obtained involving the initial fragmentation using a jaw crusher, and additional fragmentation (i.e. reduction) using a sizer. Originality.It has been determined that magnetic susceptible tuff share is 49% of the sample weight; the remaining part is a silicate share. Logarithmic nature of the analytical softening dependences while water saturating has been identified. The above-mentioned denotes the increased saturation along with the increase in a sample weight. Practical implications. The definition of tuff ultimate composition as well as analytical softening dependences in the process of water saturation makes it possible to calculate the required water consumption. Keywords: tuff, basalt, softening, water saturation, silicate, magnetic susceptibility, ultimate composition, crushing

scholarly journals Research of the properties of quarry tuff-stone for complex processing

2021 ◽  
Vol 280 ◽  
pp. 01003
Author(s):  
Zinovii Malanchuk ◽  
Vitalii Zaiets ◽  
Lesia Tyhonchuk ◽  
Svitlana Moshchych ◽  
Ganbileg Gayabazar ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Spectral Analysis ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Water Saturation ◽  
Raw Materials ◽  
Dehydration Process ◽  
Parabolic Law ◽  
Logarithmic Law

This article focuses on the complex processing of quarry tuffs-stone to extract metals (iron, titanium, copper, silver, etc.) and obtain raw materials for construction and agriculture. The issue of tuff-stone softening was investigated and the analytical dependence of the regularity of tuff-stone softening at water saturation was established, which indicates that the saturation increases with increasing mass of the sample according to the logarithmic law, and the dehydration process occurs according to the parabolic law. Also in the course of researches the magnetic susceptibility of tuff-stone was defined, which depends on size of induction of a magnetic field. The magnetically sensitive part is up to 50% by weight of the sample, and the remaining silicate part at a magnetic field strength of 1.3 Tesla. Spectral analysis showed a high content of metals in the magnetically sensitive part of tuff-stone, which consists of iron (35-40%), titanium (2.5-4.0%) and copper in the silicate part (0.4-0.7%). It was found that the percentage of content representing commercial interest, and therefore it is appropriate complex processing.

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.

Interaction, engagement, and perceived interactivity in single-handed interaction

2016 ◽  
Vol 26 (5) ◽  
pp. 1134-1157 ◽  
Author(s):  
Donghee Shin ◽  
Myunggoon Choi ◽  
Jang Hyun Kim ◽  
Jae-gil Lee
Keyword(s):  
Behavioral Intention ◽  
Interaction Techniques ◽  
Content Type ◽  
Thumb Movement ◽  
Wide Range ◽  
Mobile Industry ◽  
Perceived Interactivity ◽  
The Subject ◽  
Definition Of ◽  
Practical Implications

Purpose The purpose of this paper is to examine the effects of interaction techniques (e.g. swiping and tapping) and the range of thumb movement on interactivity, engagement, attitude, and behavioral intention in single-handed interaction with smartphones. Design/methodology/approach A 2×2 between-participant experiment (technological features: swiping and tapping×range of thumb movement: wide and narrow) was conducted to study the effects of interaction techniques and thumb movement ranges. Findings The results showed that the range of thumb movement had significant effects on perceived interactivity, engagement, attitude, and behavioral intention, whereas no effects were observed for interaction techniques. A narrow range of thumb movement had more influence on the interactivity outcomes in comparison to a wide range of thumb movement. Practical implications While the subject of actual and perceived interactivity has been discussed, the issue has not been applied to smartphone. Based on the research results, the mobile industry may come up with a design strategy that balances feature- and perception-based interactivity. Originality/value This study adopted the perspective of the hybrid definition of interactivity, which includes both actual and perceived interactivity. Interactivity effect outcomes mediated by perceived interactivity.

The operational efficiency of passenger aircraft

2006 ◽  
Vol 78 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Donald McLean
Keyword(s):  
Design Methodology ◽  
Operational Efficiency ◽  
Civil Aviation ◽  
Content Type ◽  
Transport Economics ◽  
Load Factors ◽  
Consistent Assessment ◽  
Definition Of ◽  
Passenger Aircraft ◽  
Practical Implications

PurposeTo provide for the use of airlines and other civil aviation organizations a practical definition of operational efficiency and to show how it can be determined.Design/methodology/approachA brief account of air transport economics is used to demonstrate how bom load factors and aircraft utilization need to be considered in assessing operational efficiency. Then other efficiencies are treated briefly before an example is given of how the better of two fictitious aircraft can be chosen for a particular route. A second example involving the calculation of the operational efficiency achieved by an imaginary airline is also given to show that the typical value is lower than might be expected, particularly in view of the relatively high load factors involved.FindingsProvides performance values and economic figures which are typical of current airline operations.Practical implicationsUse of the proposed definition will allow the consistent assessment of the economic performance of airlines.Originality/valueAt present there is no definition of operational efficiency in general use although it is greatly needed by airlines. The definition proposed in this paper is practical and easy to use.

Digital competences of the workforce – a research topic?

2017 ◽  
Vol 23 (3) ◽  
pp. 721-734 ◽  
Author(s):  
Matthias Murawski ◽  
Markus Bick
Keyword(s):  
Research Topic ◽  
Future Research ◽  
Digital Competence ◽  
Content Type ◽  
Research Activities ◽  
Starting Point ◽  
Pros And Cons ◽  
Definition Of ◽  
The Individual ◽  
Practical Implications

Purpose Considering working in the digital age, questions on the consequences for the individual workers are, so far, often neglected. The purpose of this paper is to deal with the question of whether the digital competences of the workforce is a research topic. The authors argue for the thesis that it is indeed a research topic. Design/methodology/approach In addition to a literature analysis of the top IS, HR, and learning publications, non-scientific sources, as well as the opinions of the authors, are included. The authors’ thesis is challenged through a debate of corresponding pros and cons. Findings The definition of digital competences lacks scientific depth. Focussing on the workforce is valid, as a “lifelong” perspective is not mandatory for research. Digital competence research is a multidisciplinary task to which the IS field can make a valuable contribution. Research limitations/implications Although relevant references are included, some aspects are mainly driven by the opinions of the authors. The theoretical implications encompass a call for a scientific definition of digital competences. Furthermore, scholars should focus on the competences of the workforce, including occupations, roles, or industries. The authors conclude by providing a first proposal of a research agenda. Practical implications The practical implications include the alignment of multiple stakeholders for the design of “digital” curricula and the integration by HR departments of the construct of digital competences, e.g. for compensation matters and job requirements. Originality/value This paper is one of very few contributions in the area of the digital competences of the workforce, and it presents a starting point for future research activities.

International Supply Chains in APR

2015 ◽  
pp. 48-55
Author(s):  
V. Sokolov
Keyword(s):  
Supply Chains ◽  
Raw Materials ◽  
Computer Industry ◽  
Vertical Specialization ◽  
Industrial Countries ◽  
International Production ◽  
Computing Machinery ◽  
Labor Division ◽  
Definition Of ◽  
Made In China

The article considers the problem of international supply chains in machinery-building. The meanings of appropriate terms are specified (outsourcing, international production sharing, vertical specialization). It is clarified (following D. Hummels et al.) the definition of vertical specialization as a structure of supply chain when a country is using imported inputs to produce goods for exports. It is emphasized that countries exporting raw materials usually show high share of vertical specialization-based trade in their exports but not in imports. Developed industrial countries (excluding Japan) usually show high content of vertical specialization-based trade in both exports and imports. Statistical analysis of the intra-industry labor division in the office, accounting and computing machinery of Asia and Pacific is made. In China and Japan most inputs consumed by office, accounting and computing machinery are of domestic origin. The larger share of intermediate production of the office, accounting and computing machinery, consumed by the same branch, in China is of domestic origin, too. It means that a queue of successive components of supply chains is placed on the territory of China. At the same time, what concerns the territory of Korea assembling industries are prevailing. In USA and Japan the branch is using as inputs mostly intermediate production of domestic origin. Still, a larger fraction of the intermediate production of the computer industry itself is imported. In the four from five countries reviewed (USA, Japan, Republic of Korea, Thailand) the imported intermediate production for computer industry used by the respective industry as inputs is larger than the domestic production. This proves high degree of internationalization of this industry in Asia and Pacific.

scholarly journals Research and development projects fuzzy definition in the university context

2019 ◽  
Author(s):  
Dorota Kuchta
Keyword(s):  
Research Funding ◽  
Fuzzy Theory ◽  
Value Added ◽  
Project Managers ◽  
Structured Interviews ◽  
Innovative Potential ◽  
Definition Of ◽  
The University ◽  
Practical Implications ◽  
Selection Of

Purpose – research on R&D projects implemented at universities shows that many researchers feel that the requirements set on R&D project definition in the process of calls for projects brake the innovativeness and the freedom of research. Thus, the objective of the paper is to propose a soft, fuzzy set based method of R&D project definition, which would allow to evaluate projects in the stage of project calls, but at the same time would not act contrary to the research ideas of the most ingenious and innovative researchers. Research methodology – the proposal is based on the results of over 70 structured interviews with R&D project managers from Polish and French universities. The respondents expressed their critical opinion about the required definition of R&D projects in the application stage of most calls, suggested which elements should be improved and in which way. Most of them criticised the required detail level of projects description and emphasized the uncertainty present in their research. Then we propose to model this uncertainty by means of fuzzy sets. Findings – the result of the research presented in the paper is a new way of R&D project definition, based on the fuzzy theory, adjustable to each R&D project type. The new method of project definition will express the actual uncertainty and innovative potential of each R&D project and thus allow a selection of R&D projects which would maximise their contribution to the university and science development. Research limitations – the proposed approach needs to be validated and verified on the basis of a big sample of a real world R&D project, with the participation of a representative sample of researchers. Another limitation is a highly probable resistance against such an approach among the researchers and research funding institutions, as it requires a deep analysis of the planned research and its context. Practical implications – it is proposed that the method will be used by research funding institutions in project calls. This will increase the efficiency of financial resources spent on research, in terms of value-added per one dollar invested in the research. Originality/Value – the proposed method is the first approach to project definition based on fuzzy numbers and one of very few existing approaches to project definition taking uncertainty into account

scholarly journals Generality of Correlation between Yield and Reduced Mass of Raw Materials in Organic Reactions

2021 ◽  
Author(s):  
Masatoshi Kawashima
Keyword(s):  
Molecular Weight ◽  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Raw Materials ◽  
Order Approximation ◽  
Product Yield ◽  
Rotatable Bond ◽  
Carbon Chains ◽  
Synthetic Reactions ◽  
Aliphatic Carbon

To validate a generality of the correlation between product yield and reduced mass of raw materials, the regression analysis of 129 reaction examples (55 as a sample size) including at least 66 types of reactions used in syntheses of natural products such as peptides and terpenes was conducted. It was possible to predict a yield of a variety of synthetic reactions for a synthesis of natural product with many aliphatic carbon chains by applying a reduced mass, adjusted with a molecular weight and the number of rotatable bond, to the regression equation. Moreover, it was found that the increase in yield due to a use of the adjusted reduced mass correlated with the harmonic mean of the molar heat capacity of raw materials and was expressed as a second-order approximation within the analysis range.<br>

scholarly journals Peculiarities of the accounting display of transactions with the give-and-take raw materials at restaurant institutions

2021 ◽  
Vol 68 (1) ◽  
pp. 87-95
Author(s):  
A. Tsiutsiak ◽  
I. Tsiutsiak
Keyword(s):  
Raw Materials ◽  
Balance Sheet ◽  
Economic Resources ◽  
Accounting System ◽  
Activity Type ◽  
Production Methods ◽  
Advantages And Disadvantages ◽  
Process Representation ◽  
Reliable Representation ◽  
Definition Of

The essence of the definition of «give-and-take raw materials» is investigated and the own vision of this category used by restaurant enterprises is formed. The scheme of conducting transactions with raw materials obtained on the give-and-take conditions at restaurants institutions is given. The peculiarities of the accounting process representation caused by the procurement of raw materials, production of semi-finished products and home-produced dishes are revealed, as well as the order of the realization accounting of such commodity stocks using production-trade and production methods is highlighted. The advantages and disadvantages of the representation in the system of bookkeeping accounts of the economic resources cycle in different ways of the production and trade activity organization of restaurant institutions are given. The emphasis is placed on the fact that in catering establishments the give-and-take raw materials, semi-finished products and home-produced dishes, produced as a result of give-and-take raw materials processings, are not the property of the catering establishment. Therefore, in order to maintain the proper accounting for transactions with the give-and-take raw materials, information about changes in the value of the investigated assets should be represented in the system of bookkeeping off-balance sheet accounts. The order of the display on the bookkeeping accounts of the transactions with the give-and-take raw materials obtained on the give-and-take conditions is highlighted. The peculiarities of calculation of dishes produced on the conditions of the give-and-take transactions are described. It is established that the formation of the value of produced semi-finished products or dishes is carried out for each order received separately, i.e. using the out-of-order cost accounting method. The peculiarities of calculation of home-produced dishes at restaurants institutions are outlined. For reliable representation of information on the availability and movement of the give-and-take raw materials, it is proposed for the enterprises of the investigated economic activity type to open the additional analytical accounts. Recommendations for improving the representation order in the accounting system, of restaurant institutions, give-and-take transactions, using offered analytical accounts, are formed.

scholarly journals Development of a mathematical model for calculating the process of crushing hard rocks by explosions of cylindrical charges of explosives

2020 ◽  
Vol 5 ◽  
pp. 30-32
Author(s):  
Norov Yunus Dzhumaevich ◽  
Mehmonov Maksud Rabbonokul ugli
Keyword(s):  
Mathematical Model ◽  
Rock Mass ◽  
Mechanism Of Action ◽  
Mathematical Description ◽  
Granulometric Composition ◽  
Rock Fragmentation ◽  
Hard Rocks ◽  
Definition Of ◽  
The Relationship

The article presents a developed mathematical model for calculating the granulometric composition of the blasted rock mass based on the mechanism of action of an explosion in rocks, a mathematical description of the determination of natural units (blocks) in the rock mass, the relationship between the degree of rock fragmentation and the size of the units and the definition of sections of the controlled pressure zone.

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