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Упит dcterms_subject_txt:hirdoelektrana „Đerdap 1“

4965 items

  • Варијанта решења примене екрана у заштити Површинског копа Дрмно од вода

    Дарко Станић (2024)
    Због напредовања рударских радова, Површински коп Дрмно се приближава кориту реке Дунав на северној страни. Постоје две могуће границе површинског копа, а због сигурне експлоатације потребно је одабрати квалитетно предодводњавање.То је могуће израдом водонепропусног екрана.Одрађени су прорачуни прилива подземних вода у коп за обе локације површинског копа, применом водонепропусног екрана. Локација 1 има контуру површинског копа по постојећој Студији изводљивости, а Локација 2 има контуру копа на основу резултата нових геолошких истраживања. Свака локација има по две варијанте предодводњавања ...
    одводњавање, водонепропусни екран, површински коп Дрмно
    ... y CHIDKePby IIHje3OMeTapcKor HHBOa HMa BapujaHra 1-3, OK cy y BapHjaHTaMa 1-I w 1-2 npHOmmKHo HcTH. Ha kpajy eKcmnoarTanuje HajHMDKH HHBOH TIOJ3ĆMHHX BOJLa JaBJbajy ce y BapuHjaHrH 1-2, aarMM y Bapujanru 1-3 w Ha Kpajy y Bapujagru 1-1. 57 Kajana cy y miraby eQekTuH pana pasaMarpaHux BapujanTu ...
    ... BOJIa y IIOBJIaATHHM IIČCKOBHM4. IIpea JIokanuju-1 KoHType HMoBpmmHckor Kona JIpMHo Ha Kpajy 2030. ronmuHe HajBehe oOapame HHBO4 HOJGMHHX BOJaA y HOBJHaTHHM HCCKOBHMAa III yrjbeHor coja jaBJba ce y BapujarHrH 1-3, aaTaM y Bapujanru 1-1, na y Bapujanru 1-2. Ha kpajy 2035. TOJUHHe HajBehe e(beKTe y ...
    ... ecenu. 3.1. Jlokauuja ekpaHa 1 Ha JIokamuju 1 (CraKa 3.1) Moryha je aapanna nBe BapHjaHTe eKpaHa, H TO: eKpaH Ca yKJIHMRbĆMbĆCM y II yrJbeHH CJIOJ H CKpaH Ca yKJIMHM5embeM y III yrybeHmM cMoj. Y ooGe BapHjanHTe JUy)kuHa eKpaHa Ou HaHocuna 6.782,4 m. Bapujanra 1-1 V oBoj BapHjaHTH eKpaH OM MMaoO ...

  • Процјена хазарда и ризика од клизишта за различите нивое просторног планирања у Републици Српској, БиХ

    Цвјетко С. Сандић (2022)
    Територија Републике Српске је у посљедних десетак година веома угрожена активирањем нових и реактивирањем старих клизишта. Она својим дјеловањем наносе огромне материјалне штете, па и људске жртве, те је неопходно озбиљније третирање и дјеловање у борби са овим природним хазардом. Чест проблем јесте одговорност, тј. надлежност институција из ове области и недостатак у законској регулативи која готово никако или само површно обрађује област хазарда и ризика од клизишта. Усљед непостојања праксе и усвојених методологија које су у примјени у свијету, циљ ...
    Kлизишта, склоност, хазард, ризик, процјена, просторно планирање, угроженост

  • Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt (2015)
    General Earth and Planetary Sciences

  • Application of the VIKOR Method for Selecting the Purpose of Recultivated Terrain after the End of Coal Mining

    Radmila Gaćina, Sanja Bajić, Bojan Dimitrijević, Tomislav Šubaranović, Čedomir Beljić, Dragoljub Bajić (2024)
    reclamation, coal, sustainable development, multi-criteria decision making, VIKOR method

  • Eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje

    Marko Lazić, Filip Miletić, Milena Lekić, Veljko Rupar, Željko Petrović, Lazar Žujović (2021)
    U radu su analizirani eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje. Period analize je prvih šest meseci tekuće godine. Analiza je vršena sa aspekta ostvarene proizvodnje, kvaliteta uglja, efektivnog vremena rada, kapacitetnog i vremenskog iskoršćenja i zastoja sistema. Za poređenje podataka različitih parametara koji po svojoj prirodi nisu međusobno uporedivi, u radu su korišćene metode višekriterijumskog odlučivanja.
    proizvodnja uglja, zastoji, metode višekriterijumskog odlučivanja
    ... MMOM 2 1 1,..., ; 1,..., n ij ij m ij i x rimj x = === å max , 1,..., ; 1,..., n ij ij i x rimj x === , 1,..., ; 1,..., n ijiij pwrimj =×== { } ''' 12 ||,,...,..., ijijjn MAXMIN AvjKivjKvvvv ii + æöæö =ÎÎ= ç÷ç÷ èøèø 2 1 () n ijj j Sivv ...
    ... za v = 0,5; 0,6 i 0,7 Sistem v = 0,5 v = 0,6 v = 0,7 Qj Rang Qj Rang Qj Rang I BTD 0,153015 1 0,183619 1 0,214222 1 II BTD 0,5 3 0,4 3 0,3 2 III BTD 1 4 1 4 1 4 IV BTD 0,246826 2 0,296191 2 0,345556 3 Na osnovu rezultata analize dolazi se do zaključka da je ...
    ... * * 1 * * () () () max () n iij ji i ii iij ji i ii xx Sw xx xx Rw xx - = - - = å - éù - = êú - êú ëû ** () () (1) ()() j j ss RjR Qvv ssRR - - -- - - =+- -- * * min;max min;max jj j j jj j j SSSS RRRR - - == == 1 ... n CC 1111 1 ... ... n mmmn Axx ...

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... A о Area ог decreasing Area of constant Area ofincreased 3 failure rate , failure rate | failure rate G > » » д 1 ı — || ı о 1 || о || || — ı || ~ ı 1 c 1 ı ı 1 1 ı ı ı ı ı ı ı а зЖ - Time Figure 5. "Bath tub" curve, a relatioh of time апа failure rate 289 1.048E-29 ...
    ... 12 3 1 0,97 0.955 __0.915 0.9I% ___9;905\\ 05 7 —= . 2 | T ф \ 0.722 e 5 0.6 – | : | 0.602 –ј | 5ћапећа! РОЗ20У-1 04 _ | | d О 0.316 | 0.2 - | | | | Џ Џ 0 T T T T T Ц T T T 1.year 2. уеаг 3. уеаг 4. уеаг 5. уеаг 6. уеаг5 7. уеаг5 8. уеаг5 9. уеаг5 10. уеаг5 Figure 8. ...
    ... more stoppages (failures) (Figure 1). 286 3000 | [mh] /_—\_/—\ | 2500 - ИИ иИ 2000 - / es / —о— Аџегаве геа!7еа moto hours — — Ауегаве рјаппеа stoppages 1000 + —-—Average ипрјаппеа stoppages 500 4 + Tr ту — А А Ак.к Д 0 т т 7 т т т — 7 1.year 2. уеаг 3. уеаг 4. уеаг 5 ...

  • Cytotoxic activity of tetradentate Schiff Base Copper(II) complexes

    Nevenka Gligorijević, Aleksandar Mijatović, Sandra Aranđelović, Rada Baošić (2021)
    Istraživanje kompleksa bakra kao potencijalnih antikancerogenih agenasa nudi ohrabrujuće perspektive u odnosu na komplekse platine (II) računajući na smanjenu toksičnost, novi mehanizam delovanja, različit spektar aktivnosti i perspektivu neunakrsne rezistencije. Kompleksi Šifovih baza bakra(II) koji sadrže tetradentatne ligande acac2en tipa (acac2en (1); tfacac2en (3), acactfacacen (4), acacphacacen (6)) pokazali su važnu antioksidativnu aktivnost, visok potencijal za interakciju sa HSA i DNK, u prethodnim studijama. Zbog toga je bilo interesantno ispitati i uporediti potencijal antikancerogene aktivnosti in vitro, u odnosu ...
    Bakar(II) kompleksi, citotoksičnost, ćelijski ciklus

  • Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis

    Ivan Kojić, Achim Bechtel, Reinhard Sachsenhofer, Dragana Životić, Ksenija Stojanović (2019)
    ... slightly increase from Pyr400 to Pyr500. The same 15 тејајед to methylfluorene (МЕ) гано (2-+3-MF)/(1-+4-MF) and methyiphenanthrene (МР) index 3 (МРТ 3). However, maturity rattos., MFI 1 and МРТ 1 which contain unsubstituted aromatics (fluorene, phenanthrene) in the denominator do not show clear ...
    ... + : “ м “ ШРОРИИИИ | РИ ЛИГР УИИИ Figure 1. Тога оп сћготагортатз ој aliphatic јтаспопз (А, В) апа aromatic fiacfions (С, D) ор таптх соа! ехтаст апа соттезропате аша ругођузаге аг 450 "С. n-Alkanes аге ТађеЏед according to феш carbon number, A — 1-n-Alkenes with same number ог carbon atoms as ...
    ... catagenesis | Ivan Kojić, Achim Bechtel, Reinhard Sachsenhofer, Dragana Životić, Ksenija Stojanović | 29th International Meeting on Ogranic Geochemistry, 1-6 September 2019, Gothenburg, Sweden | 2019 | | http://dr.rgf.bg.ac.rs/s/repo/item/0005740 Дигитални репозиторијум Рударско-геолошког факултета Универзитета ...

  • Named Entity Recognition for Distant Reading in ELTeC

    Francesca Frontini, Carmen Brando, Joanna Byszuk, Ioana Galleron, Diana Santos, Ranka Stanković (2020)
    Akcija COST „Udaljeno čitanje za evropsku književnu istoriju“, koja je počela 2017. godine, ima među svojim glavnim ciljevima stvaranje višejezične zbirke evropskih književnih tekstova (ELTeC) otvorenog koda. U ovom radu predstavljamo rad koji je obavljen na ručnom označavanju selekcije ELTeC kolekcije za imenovane entitete, kao i na proceni postojećih alata za prepoznavanje imenovanih entiteta u pogledu njihove sposobnosti da automatski urade takve anotacije. U poslednjem paragrafu se razmatraju zajedničke tačke između ove inicijative i CLARIN-a.
    ... 7 3 1 1 2 8 4 0 .4 6 5 0 .3 9 5 0 .5 3 5 P E R S 8 2 5 1 2 1 1 5 0 .4 1 6 0 .1 3 8 0 .5 8 4 S P A C Y -f ra L O C 1 0 3 7 8 4 6 8 0 .1 8 0 0 .5 6 9 0 .8 2 0 P E R S 3 2 9 1 9 4 2 9 7 0 .5 2 6 0 .6 2 9 0 .4 7 4 P A L A V R A S -p o r 1 L O C 2 2 3 6 3 4 4 0 .8 3 5 0 .7 8 0 0 .1 6 5 P E R S 8 1 6 9 ...
    ... 5 3 0 .3 0 9 S r p N E R - s r p L O C 1 0 7 7 8 19 0 .8 4 9 0 .5 7 8 0 .1 5 1 P E R S 7 1 8 2 6 7 1 5 8 0 .8 2 0 0 .7 2 9 0 .1 8 0 S P A C Y -s rp L O C 5 7 1 2 8 1 0 4 0 .3 5 4 0 .3 0 8 0 .6 4 6 P E R S 5 5 3 4 3 2 3 1 5 0 .6 3 7 0 .5 6 1 0 .3 6 3 T a b le 2: R e s u lts o f th e s tr ic t ...
    ... 4 0 .7 1 6 P E R S 5 6 9 2 3 6 3 9 3 0 .5 9 1 0 .7 0 7 0 .4 0 9 S ta n f o r d - e n g L O C 9 8 1 0 0 1 2 6 0 .4 3 8 0 .4 9 5 0 .5 6 3 P E R S 6 4 9 5 3 5 3 9 9 0 .6 1 9 0 .5 4 8 0 .3 8 1 S P A C Y -e n g L O C 9 8 1 0 0 1 7 0 0 .3 6 6 0 .4 9 5 0 .6 3 4 P E R S 5 3 6 6 4 8 2 4 0 0 .6 9 1 0 .4 5 ...

  • Ostvarivanje dobiti pri uvođenju sistema agregatnih zamena na osnovnoj rudarskoj mehanizaciji površinskih kopova EPS

    Predrag Jovančić, Ignjatović Dragan, Đenadić Stevan (2021)
    Jedan od osnovnih zadataka na površinskim kopovima uglja je ostvarivanje zadovoljavajućeg vremenskog i kapacitetnog iskorišćenja kontinualnih sistema. Da bi se to postiglo, neophodno je izvršiti izmene u postojećoj strategiji održavanja. Preduslov je uvođenje agregatne zamene vitalnih delova na rudarskim mašinama. Benefiti su višestruki. Očekivani rezultati ovakvog pristupa su: smanjenje zastoja i povećanje vremena rada; direktne materijalne uštede; bolja organizacija rada; racionalizaciju radioničkih i magacinskih kapaciteta; povećanje vrednosti mašina. Da bi se uvela agregatna zamena neophodne su investicije za nabavku ...
    agregatne zamene, održavanje, mehanizacija, Benefit Cost analiza

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... duui (XRPD) (SEM-EDS) Rudnik Rud05/1 5.748(2) 5.680(2) 5.778(2) 112.09(1) 174.8(1) 1.63207(6) 33.346(1) / 39 5.750(2) 5.685(2) 5.7744(16) 112.30(1) 174.95(9) 1.63248(5) 33.701(1) / Rujak GKC2017/03 5.750(7) 5.676(7) 5.768(7) 111.84(6) 174.7(4) 1.6330(1) 34.143(2) 0.7Ni GKC2017/04 5.751(3) 5 ...
    ... 769(2) 111.84(2) 174.8(1) 1.63138(6) 32.748(1) 03 %02' ŠbS Ni, Drenjak TI-1 5.749(3) 5.684(3) 5.781(3) 112.13(2) 175.0(1) 1.63209(6) 33.363(1) 0.3Co TI-2 5.741(5) 5.679(5) 5.768(4) 112.25(1) 174.2(2) 1.6315(2) 32.861(3) / TI-6 5.743(2) 5.670(2) 5.772(2) 111.82(2) 174.5(1) 1.63071(3) 32.1674(6) / ...
    ... Trepča Trepča 2 5.748(1) 5.677(2) 5.780(1) 112.07(1) 174.82(8) 1.63083(7) 32.271(1) 0.2Sb Golijskareka G.R.7.1 5.749(2) 5.686(2) 5.775(2) 112.06(1) 174.97(8) 1.63318(4) 34.3086(8) 1.1 Co Jurija CV-J2 5.748(2) 5.684(2) 5.776(2) 112.06(2) 174.9(1) 1.63304(5) 34.187(1) 4.3Co Crystals 2023 ...

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... [𝑝𝑙 ∙ 𝑞𝑙, 𝑝𝑢 ∙ 𝑞𝑢] 4. Division �̂��̂� = [𝑝𝑙𝑞𝑢 , 𝑝𝑢𝑞𝑙 ] 𝑞𝑙 , 𝑞𝑢 ≠ 0 5. Inversion �̂�−1 = 1�̂� = [ 1𝑝𝑙 , 1𝑝𝑢 ] 𝑝𝑙 , 𝑝𝑢 ≠ 0 �̂�−1 = 1�̂� = [ 1𝑞𝑙 , 1𝑞𝑢 ] 𝑞𝑙, 𝑞𝑢 ≠ 0 6. Equality �̂� = �̂� 𝑖𝑓 𝑝𝑙 = 𝑞𝑙 𝑎𝑛𝑑 𝑝𝑢 = 𝑞𝑢 ...
    ... 𝑠𝑖𝑢], 𝑖 = 1,2, … , 𝑁 is a set of 𝑁 interval numbers. The mean interval value of �̂� is defined as: 𝐸(�̂�) = [1𝑁 ∑ 𝑠𝑖𝑙𝑁 𝑖=1 , 1𝑁 ∑ 𝑠𝑖𝑢𝑁 𝑖=1 ] (1) 9. Maximum and minimum between two interval numbers To determine maximum and minimum between two or more interval numbers, we used ...
    ... normal to each rock sample. Longitudinal elastic waves propagation velocities are measured into three mutually normal directions which are shown as 1 −1′, 2 − 2′, 3 − 3′. In this study, the total number of samples varies depending on the type of samples. There are two types of samples: isotropic and ...

  • Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian

    Ranka Stanković, Branislava Šandrih, Cvetana Krstev, Miloš Utvić, Mihailo Škorić (2020)
    The training of new tagger models for Serbian is primarily motivated by the enhancement of the existing tagset with the grammatical category of a gender. The harmonization of resources that were manually annotated within different projects over a long period of time was an important task, enabled by the development of tools that support partial automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment ...
    Part-of-Speech tagging, lemmatization, corpus, evaluation, Serbian, morphological dictionary
    ... 96 .96 .96 3856 .96 .96 .97 6769 .97 .96 .97 10326 .97 .97 .97 13692 ADP 1 1 .99 3010 1 1 1 5556 1 1 1 8401 1 1 1 11221 ADV .9 .89 .9 745 .9 .9 .9 1410 .9 .9 .9 2111 .9 .9 .9 2861 AUX 1 1 1 1097 1 1 1 2290 1 1 1 3475 1 1 1 4781 CCONJ .98 .98 .98 1633 .98 .98 .98 2854 .98 .98 .98 4562 .98 .98 .99 ...
    ... 1031 .98 .99 .98 2007 .99 .99 .98 3343 .99 .99 .98 4731 INTJ .86 1 .75 4 .75 .75 .75 4 .8 .86 .75 8 .95 1 .91 11 NOUN .98 .99 .98 8738 .99 .99 .99 15973 .99 .99 .99 24873 .99 .99 .99 33344 NUM .99 .99 1 888 .99 .99 1 1994 1 1 1 3440 1 1 1 4464 PART .94 .94 .93 729 .94 .95 .94 1392 .95 .94 .95 2162 .95 ...
    ... 526 .93 .92 .94 826 .93 .92 .94 1130 PROPN .93 .94 .92 687 .95 .95 .95 1179 .96 .95 .96 1636 .96 .96 .97 2006 PUNCT .98 .96 1 3889 .98 .96 1 7565 .97 .95 1 11839 .98 .95 1 15570 SCONJ .97 .97 .97 662 .98 .98 .97 1382 .98 .98 .97 2243 .98 .98 .97 3124 MISS 0 0 0 150 0 0 0 353 0 0 0 651 0 0 0 785 ...

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... can be written as: low = (0/1, 0/2, 1/3, 1/4, 0.33/5, 0/6, 0/7, 0/8, 0/9, 0/10) moderate = (0/1, 0/2, 0/3, 0.5/4, 1/5, 1/6, 0.5/7, 0/8, 0/9, 0/10) high = (0/1, 0/2, 0/3, 0/4, 0/5, 0.33/6, 1/7, 1/8, 0/9, 0/10) very high = (0/1, 0/2, 0/3, 0/4, 0/5, 0/6, 0/7, 0/8, 1/9, 1/10) Input parameters can be ...
    ... form (1): FN = (μ j = 1, … μ j = 10) (1) Linguistic variables (H) can be presented in the same form. For example, if H = Very low, μ = 1 for j = 1, 2; μ = 0 for j = 3, ..., 10. Other fuzzy sets can be written as: low = (0/1, 0/2, 1/3, 1/4, 0.33/5, 0/6, 0/7, 0/8, 0/9, 0/10) moderate = (0/1, 0/2 ...
    ... 0/2, 0/3, 0.5/4, 1/5, 1/6, 0.5/7, 0/8, 0/9, 0/10) Figure 2. Fuzzy sets. In dependence of µ, fuzzy number (FN) can be presented in form (1): FN = (µ j = 1, . . . µ j = 10) (1) Linguistic variables (H) can be presented in the same form. For example, if H = Very low, µ = 1 for j = 1, 2; µ = 0 for j ...

  • Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević (2019)
    Изингов модел, критично понашање, танки системи

  • Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria

    Vladimir Krivošić, Luka Crnogorac, Rade Tokalić (2024)
    The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...
    utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijuma

  • Crystallographic, spectroscopic, thermal and computational studies of polymeric cobalt(II)–mellitate complex with 2,2′-bipyridine

    Lidija Radovanović, Dušan P. Malenov, Marko V. Rodić, Aleksandar Kremenović, Jelena Rogan (2021)
    Orange single crystals of new polymeric cobalt(II) complex {[Co(bipy)(H2O)4]2[Co(μ-mell)(H2O)2]·10H2O}n, 1, were synthesized by slow evaporation method at room temperature (bipy = 2,2′-bipyridine, mell = hexaanion of mellitic acid) and its crystal structure was determined by single-crystal X-ray diffraction. The complex 1 was characterized based on elemental analysis, FTIR spectroscopy and thermal (TG/DTA) analysis followed by computational analysis of noncovalent interactions and quantum chemical calculations of interaction energies. In 1, two crystallographically different Co(II) atoms adopt a deformed octahedral geometry, ...
    Inorganic Chemistry, Organic Chemistry, Spectroscopy, Analytical Chemistry

  • 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
    ... Si1—O3—Si1vii 164.3 (7) O1v—Si1—O3 109.4 (2) �2 Symmetry codes: (i) x + 1 2, y + 1 2, z; (ii) x, �y, �z + 1; (iii) �x, �y, z � 1 2; (iv) � x � 1 2, � y � 1 2, z � 1 2; (v) x � 1 2, �y � 1 2, �z + 1; (vi) �x + 1 2, �y � 1 2, �z + 1; (vii) �x, y, �z + 3 2. Table 6 Bond valences ij (v. u.) for polymorph ...
    ... coordinates of the high- and low-temperature structures of crystal 1 determined at 298 K and 100 K, respectively, are related by the following 4 by 4 transformation matrix: �1 1 0 0 �1 �1 0 0 0 0 1 1 2 0 0 0 1 0 B B @ 1 C C A Amore detailed understanding of the phase transformation in ...
    ... [Figs. 1(a) and 1(b)]. These common O atoms form a pseudo-kagome pattern composed of triangles and hexagons (O’Keeffe & Hyde, 1996). Unlike a regular kagome pattern, however, smaller and larger triangles can be distinguished which surround the central six-membered ring [Figs. 1(c) and 1(d)]. The ...