Selection of the optimum location of the primary ore crushing at the open pit south mining district using the comparative analysis of simulation results of the truck transport

This paper presents a new multilevel converter with a reduced number of power components for medium voltage applications. Both symmetric and asymmetric structures of the presented multilevel converter are proposed. The symmetric topology requires equal dc source values, whereas the asymmetric topology uses minimum switch count. However, both structures suffer from high blocking voltage across the switches. To reduce the blocking voltage on switches, an optimal topology is presented and analyzed for the selection of the minimum number of switches and dc sources, while maintaining a low blocking voltage across the switches. A comparative analysis with recently published topologies was performed. The simulation results, as well as the comparative analysis, validated the robustness and effectiveness of the proposed topology in terms of the reduced power loss, lowered number of components, and cost. Furthermore, in addition to the simulation results, the performance of the proposed topology was verified using experimental results of 9, 17, and 25 levels.

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Dynamics of export potential of sunflower oil in Ukraine

Helia ◽

10.1515/helia-2021-0001 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Kateryna Vasylkovska ◽

Olha Andriienko ◽

Oleksii Vasylkovskyi ◽

Andrii Andriienko ◽

Popov Volodymyr ◽

...

Keyword(s):

Climate Change ◽

Comparative Analysis ◽

Sunflower Oil ◽

Climate Changes ◽

Qualitative Change ◽

Sunflower Seeds ◽

Cultivation Technology ◽

Selection Of

Abstract The analysis of the production and yield of sunflower seeds in Ukraine for the period from 2000 to 2019 was conducted in the article. The comparative analysis of the gross harvest of sunflower seeds and the export of sunflower oil for the years under research was carried out. The dependence of exports on gross harvest was revealed and its share was calculated. It was determined that the export of sunflower oil has increased over the years under research, which indicates a significant Ukraine’s export potential. It was found that the increase in the share of exports by 15.9% was made possible by a qualitative change in yield, that was ensured by the changes in the cultivation technology and by the selection of sunflower hybrids that are better adapted to climate changes. The recommendations for further improvement of cultivation technology in connection with climate change in order to further increase yields and the export potential of Ukraine were given.

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A Multiple Criteria Decision Making Method to Weight the Sustainability Criteria of System Selection for Surface Mining

Energies ◽

10.3390/en14113066 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3066

Author(s):

Michał Patyk ◽

Przemysław Bodziony ◽

Zbigniew Krysa

Keyword(s):

Decision Making ◽

Performance Assessment ◽

Multiple Criteria Decision Making ◽

Surface Mining ◽

Open Pit ◽

Mining Equipment ◽

Surface Mines ◽

Mining Conditions ◽

And Performance ◽

Selection Of

Selection and assessment of mining equipment used in open pit rock mines relies chiefly on estimates of overall exploitation cost. The rational arrangement of mining equipment and systems comprising loading machines, haul trucks and crushing plants should be preceded by a thorough analysis of technical and economic aspects, such as investment outlays and the costs of further exploitation, which largely determine the costs of mining operations and the deposit value. Additionally, the operational parameters of the mining equipment ought to be considered. In this study, a universal set of evaluation criteria has been developed, and an evaluation method has been applied for the selection of surface mining equipment and the processing system to be operated in specific mining conditions, defined by the user. The objective of this study is to develop and apply the new methodology of multi-criteria selection of open pit rock mining equipment based on multiple criteria decision-making (MCDM) procedures, to enable the optimization of loading, handling and crushing processes. The methodology, underpinned by the principles of MCDM, provides the dedicated ranking procedures, including the ELECTRE III. The applied methodology allows the alternative options (variants) to be ranked accordingly. Ultimately, a more universal methodology is developed, applicable in other surface mines where geological and mining conditions are similar. It may prove particularly useful in selection and performance assessment of mining equipment and process line configurations in mining of low-quality rock deposits. Therefore, we undertook to develop universal criteria and applications for the selection and performance assessment of process machines for surface mines, taking into account environmental aspects as well as deposit quality.

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Multi-Criteria Analysis for the Selection of the Optimal Mining Design Solution—A Case Study on Quarry “Tambura”

Energies ◽

10.3390/en14113200 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3200

Author(s):

Branimir Farkaš ◽

Ana Hrastov

Keyword(s):

Decision Making ◽

Multiple Criteria Decision Making ◽

Open Pit ◽

Design Solution ◽

Mine Design ◽

Promethee Ii ◽

Mining Design ◽

Quarry Mine ◽

Selection Of

Mining design is usually evaluated with different multiple-criteria decision-making (MCDM) methods when it comes to large open pit or underground ore mines, but it is not used on quarry sites. Since Croatia is mostly mining stone, the implementation of such methods in decision making of the quarry mine design is imperative but left out. In this paper, the PROMETHEE II and AHP decision-making methods are implemented on the quarry site to find out the best final quarry design contour. By implementing the MCDM methods, the best quarry model was chosen based on 22 different criteria parameters out of three final quarry designs. The chosen model is not only financially sound but also has the least environmental impact.

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An Analysis on the Forming Load of AA 2024 Aluminium Alloy in Combined and Sequence Operation Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.519-521.949 ◽

2006 ◽

Vol 519-521 ◽

pp. 949-954 ◽

Cited By ~ 4

Author(s):

Beong Bok Hwang ◽

J.H. Shim ◽

Jung Min Seo ◽

H.S. Koo ◽

J.H. Ok ◽

...

Keyword(s):

Finite Element ◽

Load Capacity ◽

Low Cost ◽

Forming Load ◽

Mechanical Press ◽

Combined Operation ◽

Aa 2024 ◽

Load Characteristics ◽

Simulation Results ◽

Selection Of

This paper is concerned with the analysis of the forming load characteristics of a forward-backward can extrusion in both combined and sequence operation. A commercially available finite element program, which is coded in the rigid-plastic finite element method, has been employed to investigate the forming load characteristics. AA 2024 aluminum alloy is selected as a model material. The analysis in the present study is extended to the selection of press frame capacity for producing efficiently final product at low cost. The possible extrusion processes to shape a forward-backward can component with different outer diameters are categorized to estimate quantitatively the force requirement for forming forward-backward can part, forming energy, and maximum pressure exerted on the die-material interfaces, respectively. The categorized processes are composed of combined and/or some basic extrusion processes such as sequence operation. Based on the simulation results about forming load characteristics, the frame capacity of a mechanical press of crank-drive type suitable for a selected process could be determined along with securing the load capacity and with considering productivity. In addition, it is suggested that different load capacities be selected for different dimensions of a part such as wall thickness in forward direction and etc. It is concluded quantitatively from the simulation results that the combined operation is superior to sequence operation in terms of relatively low forming load and thus it leads to low cost for forming equipments. However, it is also known from the simulation results that the precise control of dimensional accuracy is not so easy in combined operation. The results in this paper could be a good reference for analysis of forming process for complex parts and selection of proper frame capacity of a mechanical press to achieve low production cost and thus high productivity.

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Matching area selection of an underwater terrain navigation database with fuzzy multi-attribute decision making method

Proceedings of the Institution of Mechanical Engineers Part M Journal of Engineering for the Maritime Environment ◽

10.1177/1475090218812517 ◽

2018 ◽

Vol 233 (4) ◽

pp. 1133-1140 ◽

Cited By ~ 2

Author(s):

Lihui Wang ◽

Desheng Sun ◽

Qingya Liu ◽

Le Yu

Keyword(s):

Set Theory ◽

Membership Functions ◽

Vague Set ◽

Topographic Factor ◽

Vague Sets ◽

Multi Attribute Decision Making ◽

Matching Performance ◽

Simulation Results ◽

Terrain Matching ◽

Selection Of

Selecting suitable underwater terrain navigation matching areas is a prerequisite for building an underwater terrain navigation database, which is important for vehicles operating underwater. By using information features to evaluate underwater terrain matching areas, vague sets are proposed to evaluate matching performance. Mathematical models of matching area features are built and topographic factor eigenvalues are obtained. With the topographic factor eigenvalues, fuzzy relationships between factor sets and judge sets are calculated. Vague set uses membership functions and non-membership functions to define the influence of topographic factor eigenvalues on matching suitability. Simulation results demonstrate that vague set theory can overcome the deficiency of single value in fuzzy sets and define the effect of geographic characteristics for matching performance. Based on vague set method, selection rules for terrain navigation matching areas in underwater terrain database are put forward.

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Observations On the Sexual Behaviour of Some Longicorn Beetles, Subfamily Lepturinae (Coleoptera, Cerambycidae)

Behaviour ◽

10.1163/156853963x00338 ◽

1963 ◽

Vol 22 (1-2) ◽

pp. 152-166 ◽

Cited By ~ 35

Author(s):

Axel Michelsen

Keyword(s):

Comparative Analysis ◽

Sexual Behaviour ◽

The State ◽

Round Dance ◽

Selection Of ◽

Stimulation Of

AbstractA description is given of the sexual behaviour of 16 longicorn beetles of the subfamily Lepturinae. The following points have been investigated:- 1. Stimulation of the female performed by the male either as a "licking" or combined "licking and tapping" of the female elytra or the grasping of an antenna of the female. 2. Movements of the antennae of the male, which seem to be an expression of the "state of excitement" of the male. These movements are in principle thought to be one of the behaviour patterns originally present in the order Coleoptera. 3. A "round dance", one of the methods for the female to throw off the male after copula, is described. 4. A selection of partner according to size is described in the genus Rhagium. 5. A comparative analysis is attempted for some species and systematic conclusions of such comparisons are proposed.

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Comparative Analysis of Ecological Rucksack Between Open-pit and Underground Coal Mine

Energy Procedia ◽

10.1016/j.egypro.2011.03.196 ◽

2011 ◽

Vol 5 ◽

pp. 1116-1120 ◽

Cited By ~ 6

Author(s):

CHU Daozhong ◽

ZHU Qingli ◽

WANG Jie ◽

ZHAO Xiaozhi

Keyword(s):

Comparative Analysis ◽

Coal Mine ◽

Open Pit ◽

Underground Coal Mine

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The methodology of the selection of auxiliary mechanisation for the open pit mines of lignite

Mine Planning and Equipment Selection 2000 ◽

10.1201/9780203747124-110 ◽

2018 ◽

pp. 577-581

Author(s):

D. Ignjatovic ◽

I. Ristovic ◽

M. Stojakovic

Keyword(s):

Open Pit ◽

Open Pit Mines ◽

Selection Of

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Prilog poznavanju djelovanja Mateja Andrijina Moronzona*

Ars Adriatica ◽

10.15291/ars.179 ◽

2016 ◽

pp. 103

Author(s):

Barbara Španjol-Pandelo

Keyword(s):

Comparative Analysis ◽

Virgin Mary ◽

Main Role ◽

Huge Number ◽

General Acceptance ◽

Parish Church ◽

Archival Documents ◽

First Time ◽

Selection Of

Matteo Moronzon, a member of the Venetian family of woodcarvers, was mentioned for the first time in 1407 according to the present known archival documents. Probably after being trained in his father's workshop in Venice, he moved to Zadar with his family – his wife Francisca and sons Pietro and Francesco. In 1418 he undertook the commission of furnishing carved choir stalls for the cathedral of St. Anastasia in Zadar. Various archival documents testify that Matteo lived and worked in Zadar for many years. Therefore it can be assumed that he probably founded his own workshop in Zadar where his son Francesco was trained too. Apart from the attempt to reconstruct Matteo's life and career, the aim of this paper is to interpret one important woodcarving work of art preserved in situ: choir stalls in the former cathedral of Rab, today the arch parish church of the Assumption of the Blessed Virgin Mary in Rab. Without doubt Matteo was the master carver in the production of the choir stalls in Zadar. Since he lived in Zadar it was not unusual that he had the main role in carving the stalls. In Zadar the selection of motives is more balanced and there are no significant differences in the modelling of decorative elements. However, the question whether Matteo carved absolutely everything or he had assistants arises. Considering the amount of work that had to be done it must be assumed that he had assistants who participated in work and helped him to shape the stalls. However, in literature Matteo was considered the only and undisputed author of the choir stalls in Zadar, mostly because of the preserved document. The analysis of the choir stalls in Rab by Ivo Petricioli as well as their evident formal and stylistic similarities with the stalls from the cathedral in Zadar have led to the general acceptance of the hypothesis that they were carved at the workshop of Matteo Moronzon. However, a comprehensive comparative analysis that could confirm that hypothesis was still missing. The analysis of the details and the whole led to the overall conclusion that there were a huge number of similarities between the choir stalls in Rab and Zadar. Therefore it was concluded that Matteo was the principal designer of the choir stalls in Rab who also carved the best parts in Rab, while others, less successful parts, were made by his apprentices and assistants who at the time lived on the island of Rab. In this respect, if Matteo was accepted as the author of the choir stalls of the cathedral in Zadar he must also be accepted as the author of the choir stalls from the excathedral in Rab.

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