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4753 items
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Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika
Saša M. Jovanović (2016-05-16)Investiciono okruženje skopčano sa rudarskom industrijom je veoma svojstveno kada seuporedi sa okruženjima koje susrećemo u tipičnim proizvodnim industrijama. Neke odkarakterisitka rudarstva, koje su često naznačene kao jedinstvene su: visok intenzitetinvesticija, dugi predproizvodni periodi, visok rizik i neobnovljivost resursa.Investiranje u sistem otvaranja rudnika predstavlja dobar primer ireverzibilneinvesticije. Takva investicija zahteva pažljivu analizu, jer nakon njene realizacije ona sene može nadoknaditi bez značajnog gubitka vrednosti. Očigledno je da izbor sistemaotvaranja podzemnog rudnika pripada strateškom planiranju...... podetažu +686 m čvor 4 3 2 1 29 36 37 38 39 4 0 73 0 0 22.5 0 0 0 0 3 0 0 73 0 0 0 0 0 0 2 0 0 0 73 0 0 0 0 0 1 0 0 0 0 0 0 0 73 0 29 0 0 0 0 0 77 0 0 0 36 0 0 0 0 0 0 56 0 0 37 0 0 0 0 0 0 0 0 50 38 0 0 0 0 0 0 30 0 452 39 0 0 0 0 0 0 0 0 0 Karakteristike mreže za podetažu +686 m ...
... rastojanja za podetažu +694 m čvor 3 2 1 29 36 37 38 39 3 0 73 0 30 0 0 0 0 2 0 0 73 0 0 0 0 0 1 0 0 0 0 0 0 73 0 29 0 0 0 0 77 0 0 0 142 36 0 0 0 0 0 56 0 0 37 0 0 0 0 0 0 0 50 38 0 0 0 0 0 30 0 452 39 0 0 0 0 0 0 0 0 Karakteristike mreže za podetažu +694 m date su u Tabeli ...
... Tabela br. 24 Matrica rastojanja za podetažu +702 m čvor 2 1 29 36 37 38 39 2 0 73 37.5 0 0 0 0 1 0 0 0 0 0 73 0 29 0 0 0 77 0 0 0 36 0 0 0 0 56 0 0 37 0 0 0 0 0 0 50 38 0 0 0 0 30 0 452 39 0 0 0 0 0 0 0 140 Karakteristike mreže za podetažu +702 m date su u Tabeli br. 25. ...Saša M. Jovanović. "Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-05-16)
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Multivarijabilni modeli upravljanja u rudarstvu
Marjan M. Hudej (2014-02-03)osetljivost i rizik. Više pobuda generiše ovakvu atribuciju. Prva je, multivarijabilnostambijentalnih uslova i funkcionalna i strukturna složenost rudarskih sistema (čovek -priroda (radna sredina) - mašina – okruženje); Druga se odnosi na ne postojanje opštenaučne saglasnosti oko ocene pogodnosti modela za podršku odlučivanju i upravljanje.Treća, ako bi saglasnost i postojala, nije sigurno da bi raspoloživi modeli, metode i taktike,dale ekvivalentne rezultate za iste rudničke uslove. Četvrta, sistemske nauke još uveknemaju opšte prihvaćen i u praksi primenljiv algoritam izbora najboljeg rešenja ...... A1 1 0 1 0 0 0 A2 0 0 0 0 0 0 B1 1 1 1 0 0 0 B2 0 1 0 0 0 0 C 1 1 1 1 1 1 D 1 1 1 1 0 0 E 1 1 1 1 0 1 Tabela C-11, Matrica nesaglasne dominacije PINS = 0.6270 A1 A2 B1 B2 C D E A1 1 0 0 0 0 0 A2 0 0 0 0 0 0 B1 1 1 1 0 0 0 B2 1 1 0 0 0 0 C 1 1 1 1 0 0 D 1 1 1 1 0 0 E 1 1 ...
... PIS=0,5689 PK1 PK2 PK3 PK4 PK5 PK1 0 1 0 1 1 PK2 1 0 0 1 1 PK3 0 1 0 1 1 PK4 0 0 0 0 0 PK5 0 0 0 1 0 Tabela B-12, Matrica nesaglasne dominacije PINS=0,7495 PK1 PK2 PK3 PK4 PK5 PK1 0 1 1 1 0 PK2 0 0 1 1 0 PK3 0 0 0 0 0 PK4 0 0 0 0 0 PK5 0 1 1 1 0 Tabela B-13, Matrica agregatne dominacije ...
... agregatne dominacije Tehnološk. rešenje A1 A2 B1 B2 C D E Nadmašuje R a n g A1 1 0 0 0 0 0 1 4 A2 0 0 0 0 0 0 0 5 B1 1 1 1 0 0 0 2 3 B2 0 1 0 0 0 0 1 4 C 1 1 1 1 0 0 4 2 D 1 1 1 1 0 0 4 2 E 1 1 1 1 0 1 5 1 Tabela 4–36, AHP model, normalizovana (konačna) matrica A t r i b u t Rešenje ...Marjan M. Hudej. "Multivarijabilni modeli upravljanja u rudarstvu" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2014-02-03)
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Multivarijabilni modeli upravljanja u rudarstvu
Marjan M. Hudej (2014-02-03)osetljivost i rizik. Više pobuda generiše ovakvu atribuciju. Prva je, multivarijabilnostambijentalnih uslova i funkcionalna i strukturna složenost rudarskih sistema (čovek -priroda (radna sredina) - mašina – okruženje); Druga se odnosi na ne postojanje opštenaučne saglasnosti oko ocene pogodnosti modela za podršku odlučivanju i upravljanje.Treća, ako bi saglasnost i postojala, nije sigurno da bi raspoloživi modeli, metode i taktike,dale ekvivalentne rezultate za iste rudničke uslove. Četvrta, sistemske nauke još uveknemaju opšte prihvaćen i u praksi primenljiv algoritam izbora najboljeg rešenja ...... A1 1 0 1 0 0 0 A2 0 0 0 0 0 0 B1 1 1 1 0 0 0 B2 0 1 0 0 0 0 C 1 1 1 1 1 1 D 1 1 1 1 0 0 E 1 1 1 1 0 1 Tabela C-11, Matrica nesaglasne dominacije PINS = 0.6270 A1 A2 B1 B2 C D E A1 1 0 0 0 0 0 A2 0 0 0 0 0 0 B1 1 1 1 0 0 0 B2 1 1 0 0 0 0 C 1 1 1 1 0 0 D 1 1 1 1 0 0 E 1 1 ...
... PIS=0,5689 PK1 PK2 PK3 PK4 PK5 PK1 0 1 0 1 1 PK2 1 0 0 1 1 PK3 0 1 0 1 1 PK4 0 0 0 0 0 PK5 0 0 0 1 0 Tabela B-12, Matrica nesaglasne dominacije PINS=0,7495 PK1 PK2 PK3 PK4 PK5 PK1 0 1 1 1 0 PK2 0 0 1 1 0 PK3 0 0 0 0 0 PK4 0 0 0 0 0 PK5 0 1 1 1 0 Tabela B-13, Matrica agregatne dominacije ...
... agregatne dominacije Tehnološk. rešenje A1 A2 B1 B2 C D E Nadmašuje R a n g A1 1 0 0 0 0 0 1 4 A2 0 0 0 0 0 0 0 5 B1 1 1 1 0 0 0 2 3 B2 0 1 0 0 0 0 1 4 C 1 1 1 1 0 0 4 2 D 1 1 1 1 0 0 4 2 E 1 1 1 1 0 1 5 1 Tabela 4–36, AHP model, normalizovana (konačna) matrica A t r i b u t Rešenje ...Marjan M. Hudej. "Multivarijabilni modeli upravljanja u rudarstvu" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2014-02-03)
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Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems
Dejan Ćebić, Nebojša M. Ralević (2021)Dejan Ćebić, Nebojša M. Ralević. "Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems" in Journal of Mathematical Chemistry, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10910-021-01253-3
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Fuzzy expert analysis of the severity of mining machinery failure
Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy expert analysis of the severity of mining machinery failure" in Applied Soft Computing, Elsevier BV (2020). https://doi.org/10.1016/j.asoc.2020.106459
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Mineragenija i potencijalnost karbonatnih sirovina rudnog reona Bjelopavlića (Crna Gora)
Darko M. Božović (2016-09-28)Karbonatne sirovine, obzirom na geološku građu Crne Gore predstavljaju jednu od najznačajnijih nemetaličnih mineralnih sirovina. U Crnoj Gori postoje brojna leţišta karbonatnih sirovina (arhitektonsko - građevinskog i tehničko - građevinskog kamena) koja su istraţena ili su u eksploataciji, među kojima rudni reon Bjelopavlića zauzima najznačajnije mjesto.Dosadašnja istraţivanja karbonatnih sirovina na ovom području imala su, međutim, prevashodno uzak istraţivački cilj, utvrđivanje rezervi arhitektonsko - građevinskog i tehničko - građevinskog kamena određenog leţišta, ili preliminarna ispitivanja kvaliteta krečnjaka u njima, sa ...karbonatne mineralne sirovine, arhitektonsko - građevinski kamen, tehničko - građevinski kamen, karbonatna punila, rudni reon Bjelopavlića, potencijalnost.... ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 0 ,0 2 0 ,0 2 < 0 ,0 1 < 0 ,0 1 C r 2 O 3 < 0 ,0 0 1 < 0 ,0 0 1 < 0 ,0 0 1 < 0 ,0 0 1 0 ,0 0 1 < 0 ,0 0 1 < 0 ,0 0 1 < 0 ,0 0 1 < 0 ,0 0 1 < 0 ,0 0 1 < 0 ,0 0 ...
... 2 0 ,0 4 0 ,0 6 0 ,0 5 0 ,0 8 0 ,1 1 0 ,0 6 0 ,0 7 0 ,0 7 0 ,0 8 0 ,0 8 0 ,1 8 0 ,1 8 0 ,1 5 0 ,2 5 A l2 O 3 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 0 ,0 4 0 ,0 4 0 ,0 5 0 ,0 ...
... 0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 T iO 2 < 0 ,0 1 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 0 ,0 2 < 0 ,0 1 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 < 0 ,0 1 P 2 O 5 < 0 ,0 1 0 ,0 1 < 0 ...Darko M. Božović. "Mineragenija i potencijalnost karbonatnih sirovina rudnog reona Bjelopavlića (Crna Gora)" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-09-28)
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A necessary and sufficient condition for an algebraic integer to be a Salem number
Dragan Stankov (2019)We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "A necessary and sufficient condition for an algebraic integer to be a Salem number" in Journal de theorie des nombres de Bordeaux (2019). https://doi.org/10.5802/jtnb.1076
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Fuzzy Model for Risk Assessment of Machinery Failures
The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...... 9 10 0/minor 0.5 × 0 1 × 0 0.5 × 0 0 × 0 0 × 0 0 × 0 0 × 0 0 × 0 0 × 0 0 × 0 0.26/low 0 × 0.26 0.165 × 0.26 0.65 × 0.26 0.83 × 0.26 0.33 × 0.26 0 × 0.26 0 × 0.26 0 × 0.26 0 × 0.26 0 × 0.26 0.64/moderate 0 × 0.64 0 × 0.64 0 × 0.64 0.25 × 0.64 0.75 × 0.64 0.25 × 0.64 0 × 0.64 0 × 0.64 0 × 0.64 0 × 0.64 ...
... 64 0.1/high 0 × 0.1 0 × 0.1 0 × 0.1 0 × 0.1 0 × 0.1 0.33 × 0.1 0.83 × 0.1 0.65 × 0.1 0.165 × 0.1 0 × 0.1 0/very high 0 × 0 0 × 0 0 × 0 0 × 0 0 × 0 0 × 0 0 × 0 0.5 × 0 1 × 0 0.5 × 0 Σ 0 0.043 0.169 0.376 0.566 0.513 0.2430 0.065 0.0165 0 It is possible to start composing risk level indicators with the ...
... = (1/0, 2/0, 3/0, 4/0, 5/0.65, 6/0.65, 7/0.65, 8/0.65, 9/0, 10/0); R2 = (1/0, 2/0, 3/1, 4/0, 5/0.65, 6/0.65, 7/0.65, 8/0.65, 9/0, 10/0); R3 = (1/0, 2/0, 3/0, 4/0.75, 5/0.65, 6/0.65, 7/0.65, 8/1, 9/0, 10/0); R4 = (1/0, 2/0, 3/1, 4/0.65, 5/0.65, 6/0.65, 7/0.65, 8/0, 9/0, 10/0); R5 = (1/0, 2/0, 3/0 ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy Model for Risk Assessment of Machinery Failures" in Symmetry, MDPI AG (2020). https://doi.org/10.3390/sym12040525
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The Newton method for solving nonlinear equations based on aggregation operators
Nebojša M. Ralević, Dejan Ćebić (2019)Nebojša M. Ralević, Dejan Ćebić. "The Newton method for solving nonlinear equations based on aggregation operators" in XLVI International Symposium on Operational Research SYM-OP-IS, Kladovo, 15-18.9.2019, Универзитет у Београду (2019)
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Contribution to the geotechnical classification of municipal waste landfills in Serbia
Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental EngineeringDragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić. "Contribution to the geotechnical classification of municipal waste landfills in Serbia" in Environmental Geotechnics, Thomas Telford Ltd. (2018). https://doi.org/10.1680/jenge.18.00028
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Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic
This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композицијаMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović. "Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic" in Energies, MDPI AG (2022). https://doi.org/10.3390/en15186786
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Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine
Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...... 3 0.4 0.6 M 0.7 0.3 0.7 0.3 0.7 0.3 S 1 1 0.3 0.7 Σ R 0.450 0.525 0.025 0 0 0.525 0.475 0 0 0 0.325 0.675 0 0 0 M 0.525 0.475 0 0 0 0.700 0.300 0 0 0 0.625 0.375 0 0 0 S 0.250 0.750 0 0 0 0.650 0.350 0 0 0 0.525 0.475 0 0 0 Energies 2019, 12, 4044 11 of 18 Table 5. Results of questionnaire for ...
... (Figure 3): ‘A’ = (0(1), . . . ., 0(8), 1(9), 1(10)); ‘B’ = (0(1), . . . ., 0(5), 0.33(6), 1(7), 1(8), 0(9), 0(10)); ‘C’ = (0(1), 0(2), 0(3), 0.5(4), 1(5), 1(6), 0.5(7), 0(8), 0(9), 0(10)); ‘D’ = (0(1), 0(2), 1(3), 1(4), 0.33(5), 0(6), . . . , 0(10)); ‘E’ = (1(1), 1(2), 0(3), . . . , 0(10)). Figure ...
... 0.5 0.5 0.1 0.9 S 0.8 0.2 0.4 0.6 0.2 0.8 Σ R 0 0.300 0.675 0.025 0 0 0.425 0.575 0 0 0 0.050 0.825 0.125 0 M 0.150 0.375 0.375 0.100 0 0.150 0.650 0.200 0 0 0.150 0.650 0.200 0 0 S 0.075 0.275 0.575 0.075 0 0.025 0.650 0.325 0 0 0.150 0.700 0.150 0 0 A detailed description of the calculation for the ...Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović. "Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine" in Energies, MDPI AG (2019). https://doi.org/10.3390/en12214044
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Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova
Zoran M. Štirbanović (2015-07-01)Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina... KEX2 0 0 1 1 1 1 1 1 1 KEX3 0 0 0 0 1 1 1 1 3 KAX1 0 0 0 0 1 0 0 1 5 KAX2 0 0 0 0 0 1 1 1 4 KAX3 0 0 0 0 0 0 1 1 5 NaIPX1 0 0 0 0 0 0 0 1 7 NaIPX2 0 0 0 0 0 0 0 0 8 d) Metoda PROMETHEE Tabela 62. Kvantifikovana matrica odlučivanja. K1 K2 K3 K4 K5 K6 K7 Min/Max Max Max Max Max ...
... KEX1 KEX1 0 1 0 1 1 1 1 KEX2 0 1 1 1 1 1 1 KEX3 0 0 0 1 1 1 1 KAX1 0 0 0 1 0 0 1 KAX2 0 0 0 0 1 1 1 KAX3 0 0 0 0 0 1 1 NaIPX1 0 0 0 0 0 0 1 NaIPX2 0 0 0 0 0 0 0 Tabela 61. Matrica agregatne dominacije KEX1 KEX2 KEX3 KAX1 KAX3 NaIPX1 NaIPX2 KEX1 Rang KEX1 0 0 1 0 1 1 1 1 2 ...
... M6 0 0 0 0 0 Tabela 95. Matrica agregatne dominacije. M1 M2 M3 M4 M5 M6 Rang M1 0 1 0 1 1 1 1 M2 0 0 0 1 1 1 2 M3 0 0 0 1 1 1 2 M4 0 0 0 0 1 0 4 M5 0 0 0 0 0 1 4 M6 0 0 0 0 0 0 6 d) Metoda PROMETHEE Tabela 96. Kvantifikovana matrica odlučivanja. K1 K2 K3 K4 K5 K6 K7 K8 Min/Max ...Zoran M. Štirbanović. "Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2015-07-01)
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Mesozoic carbonate rocks in Serbia used as dimension stone
Vesna Matović, Tijana Vojnović Ćalić (2016)The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...... INI i LI 00 c O 0 0 0 0OS9% - x s _ LIA LL [4.] lO r A 60 x 009% P > s LLLI 801 tl il 00 lO 0 0 0 6 089% t s r 4 |4| 6cl LI 00 [4%]] #0 0 0 6 089% [ . ı 06 OI tl 00 c O I 0 0 6 0/9% 1-S [A] INI b{4| tl ...
... | 0 00 910 LI O c ' 089% 67Di ba:00 6 1 861 1Ic 00 0 0 0 O I 069% D [ 61 t0C LO 00 910 x O c O I L D _ _ ii ttl _ I K x O I 0 0 6 9-Di _ _ [55 881 _ 6 0 0 0 0 6 069% - D _ _ t9l 991 _ 9 0 #0 O I ...
... LO b O r N 0 0 0OS9% 9L-LL 9 I _ [A\ || _ [31] 61 _ 0 0 6 SILL I g l x x x _ 6 0 I _ 0 0 6 PULL bPt9l _ bij iis _ 890 _ _ Ob9% tULL HRAl _ LL 9I _ x _ _ 069% cI-LL [ . 101 |4] OI 00 670 I 0 0 099% T-LL ...Vesna Matović, Tijana Vojnović Ćalić. "Mesozoic carbonate rocks in Serbia used as dimension stone" in Bulletin of Engineering Geology and the Environment, Springer Science and Business Media LLC (2016). https://doi.org/10.1007/s10064-015-0722-0
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Low-temperature phase transition and magnetic properties of K3YbSi2O7
Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica... (normalization unit: 1 A). Tr," r;* Atom ox oy 6z ox éy 5z Ybi 0 0 0 0 0 0 Kl 0 0 0.0192 0 —0.0116 0 K2 0 0 0 0 —0.0297 0 Sil 0 0 0 0 —0.0083 0 Ol 0.0306 —0.0102 0.0098 0.0020 —0.0154 0.0077 O1_2 0 0.0204 0.0098 0 —0.0174 —0.0155 02 0 0 0 0 0.0284 0 3.3. Magnetic characterization The temperature dependence ...
... present in the �0-K3YbSi2O7 expressed as displacements (in relative units) of the atoms in the asymmetric unit of the reference structure (normalization unit: 1 Å). �1 + �5 + Atom �x �y �z �x �y �z Yb1 0 0 0 0 0 0 K1 0 0 0.0192 0 �0.0116 0 K2 0 0 0 0 �0.0297 0 Si1 0 0 0 0 �0.0083 0 O1 0.0306 �0.0102 ...
... site Atom ux uy uz |u| 4a (0,0,0) Yb1 0 0 0 0 8f (0,y,z) K1 0 �0.0072 0.0007 0.0725 8f (0,y,z) Si1 0 �0.0052 0 0.0513 4c (0,y,14) K2 0 �0.0185 0 0.1835 16h (x,y,z) O1 0.0024 �0.0100 0.0052 0.1263 8f (0,y,z) O1_2 0 �0.0101 �0.0093 0.1638 4c (0,y,14) O2 0 0.0177 0 0.1759 electronic reprint research papers ...Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović. "Low-temperature phase transition and magnetic properties of K3YbSi2O7" in Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, International Union of Crystallography (IUCr) (2021). https://doi.org/10.1107/S2052520621006077
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Хазард од клизишта у Србији у 21. веку
Biljana Abolmasov (2019)... � � � � � � / � � � � � � � � � � � � › � � � › � � � � � � � � � � � � � � � � � � � � � � � � � 1 : 1 0 0 . 0 0 0 � 1 : 2 5 . 0 0 0 1 . 0 0 0 � 1 0 . 0 0 0 k m 2 › � � � � � � � ( � � � � � � � � � ) , � � � � � � � � � � � � � � � � ( � � � � � � � � ...
... � � � � � � � � � � � › � � � › � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 1 : 5 . 0 0 0 � 1 : 2 5 . 0 0 0 1 0 � 1 . 0 0 0 k m 2 � � � � � � › � � � � � � � › � � � � � › � � � � � � � � � � � � � ( � � � � › � - - � � � � › � ) ...
... � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � / � � � � � � � � � � � � � < 1 : 1 0 0 . 0 0 0 > 1 0 . 0 0 0 k m 2 › � � � � � � � � � � � � � � � ( � � � � � � � � � ) � � � � � � � � � ( � � � � � � � � � � � � � � ...Biljana Abolmasov. "Хазард од клизишта у Србији у 21. веку" in Геохазард у Србији у 21. веку – знање је најбољи бедем против стихије, Српска академија наука и уметности (2019)
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The number of unimodular roots of some reciprocal polynomials
Dragan Stankov (2020)We introduce a sequence P2n of monic reciprocal polynomials with integer coefficients having the central coefficients fixed. We prove that the ratio between number of nonunimodular roots of P2n and its degree d has a limit when d tends to infinity. We present an algorithm for calculation the limit and a numerical method for its approximation. If P2n is the sum of a fixed number of monomials we determine the central coefficients such that the ratio has the minimal limit. ...Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "The number of unimodular roots of some reciprocal polynomials" in Cmptes rendus mathematique (2020). https://doi.org/10.5802/crmath.28
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A Fuzzy Expert Model for Availability Evaluation
Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...... 4/0.015, 5/0.06) Rgood.0.62 = (1/0, 2/0, 3/0.155, 4/0.62, 5/0.155) Ravr.0.32 = (1/0, 2/0.08, 3/0.32, 4/0.08, 5/0) Radq.0 = (1/0, 2/0, 3/0, 4/0, 5/0) Rpoor.0 = (1/0, 2/0, 3/0, 4/0, 5/0) After adding to each j, the fuzzy expression (membership function µ) for reliability of Liebherr which operate ...
... as: - poor = (1/j=1, 0.25/j=2, 0/j=3, 0/j=4, 0/j=5); - adequate = (0.25/j=1, 1/j=2, 0.25/j=3, 0/j=4, 0/j=5); - average = (0/j=1, 0.25/j=2, 1/j=3, 0.25/j=4, 0/j=5); (7) - good = (0/j=1, 0/j=2, 0.25/j=3, 1/j=4, 0.25/j=5); - excellent = (0/j=1, 0/j=2, 0/j=3, 0.25/j=4, 1/j=5); B. Questionnaire ...
... (1/0, 2/0, 3/0, 4/0.25, 5/1). In this way the specific values of fuzzy set good for machine Liebherr – Drmno: Rexc.0.06 = {1/(0×0.06), 2/(0×0.06), 3/(0×0.06), 4/(0.25×0.06), 5/(1×0.06)}. The remaining four linguistic variables are treated in the same way. Rexc.0.06 = (1/0, 2/0, 3/0, 4/0 ...Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić. "A Fuzzy Expert Model for Availability Evaluation" in Proceedings of the 2019 20th International Carpathian Control Conference (ICCC), AGH University of Science and Technology, Kraków - Wieliczka, Poland (2019)
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Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine
Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić. "Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945617
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A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers
Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić. "A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers" in International Journal of Industrial Engineering: Theory, Applications and Practice (2019)