326,981 research outputs found
TYB Akademi: Osman Turan ve Selçuklular Özel Sayısı, Yıl: IV, Eylül 2014, S. 12, 200 s. [Kitap Tanıtımı]
No full textOsman Turan (1914-1978) Türkiye’de Selçuklu tarihçiliği denildiğinde ilk akla gelen ilim adamlarındandır. 2014 yılının Osman Turan’ın 100. doğum yıldönümü olması vesilesiyle Türkiye Yazarlar Birliği Akademi: Dil Edebiyat ve Sosyal Bilimler Dergisi bir “Osman Turan ve Selçuklular” özel sayısı hazırladı. 200 sayfa hacmindeki bu özel sayıda toplam on yedi yazar, araştırmacı ve akademisyenin Osman Turan ve Selçuklu tarihini konu alan makaleleri yayınlandı. “Osman Turan ve Selçuklular” özel sayısının “sayı editörlüğü”nü Prof. Dr. Gülay Öğün Bezer yapmış. Dergide makalesi bulunan yazarlar ise şunlardır (yayınlanış sırasına göre): D. Mehmet Doğan, Abdurrahim Tufantoz, Gülay Öğün Bezer, Birsel Küçüksipahioğlu, Ebru Altan, Muallâ Uydu Yücel, Muharrem Kesik, Abdülkerim Özaydın, Sadi S. Kucur, Mustafa Alican, Emine Uyumaz, Ali Birinci, Salih Yılmaz, Murat Nalçacı, Celil Güngör, Fatih Gökdağ, Ali Birbiçer ve Albey Abazov
l-Degree Turan Density
No full textLet H-n be a k-graph on n vertices. For 0 <= l < k and an l-subset T of V (H-n), define the degree deg(T) of T to be the number of (k - l)-subsets S such that S boolean OR T is an edge in H-n. Let the minimum l-degree of H-n be delta(l) (H-n) = min{deg(T) : T subset of V (H-n) and vertical bar T vertical bar = l}. Given a family F of k-graphs, the l-degree Turan number ex(l) (n, F) is the largest delta(l) (H-n) over all F-free k-graphs H-n on n vertices. Hence, ex(0) (n, F) is the Turan number. We define l-degree Turan density to be pi(kappa)(l) (F) = lim sup(n ->infinity) ex(l)(n, F)/kappa(n-l). In this paper, we show that for k > l > 1, the set of pi(kappa)(l) (F) is dense in the interval [0, 1). Hence, there is no "jump" for l-degree Turan density when k > l > 1. We also give a lower bound on pi(kappa)(l) (F) in terms of an ordinary Turan density
Turan H-densities for 3-graphs
No full textGiven an r-graph H on h vertices, and a family F of forbidden subgraphs, we define ex H (n, F) to be the maximum number of induced copies of H in an F-free r-graph on n vertices. Then the Turan H-density of F is the limit pi(H)(F) = (lim)(n ->infinity) ex(H)(n, F)/((n)(h)) This generalises the notions of Turan-density (when H is an r-edge), and inducibility (when F is empty). Although problems of this kind have received some attention, very few results are known. We use Razborov's semi-definite method to investigate Turan H-densities for 3-graphs. In particular, we show that pi(-)(K4)(K-4) = 16/27, with Turans construction being optimal. We prove a result in a similar flavour for K-5 and make a general conjecture on the value of pi(Kt)-(K-t). We also establish that pi(4.2)(empty set) = 3/4, where 4: 2 denotes the 3-graph on 4 vertices with exactly 2 edges. The lower bound in this case comes from a random geometric construction strikingly different from previous known extremal examples in 3-graph theory. We give a number of other results and conjectures for 3-graphs, and in addition consider the inducibility of certain directed graphs. Let (S) over right arrow (k) be the out-star on k vertices; i.e. the star on k vertices with all k 1 edges oriented away from the centre. We show that pi((S) over right arrow3)(empty set) = 2 root 3 - 3, with an iterated blow-up construction being extremal. This is related to a conjecture of Mubayi and Rodl on the Turan density of the 3-graph C-5. We also determine pi((S) over right arrowk) (empty set) when k = 4, 5, and conjecture its value for general k
Turan and Ramsey numbers in linear triple systems II
No full textIn this paper we continue our studies of Turan and Ramsey numbers in linear triple systems, defined as 3-uniform hypergraphs in which any two triples intersect in at most one vertex. In [7] the two main problems left open were the Turan number of the wicket and the Ramsey property of the sail. In this paper we present some progress towards both of these problems.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Suppressing The Ferroelectric Switching Barrier in Hybrid Improper Ferroelectrics
No full textThere are two main parts in this work: 1. Strain-tolerance Ruddlesden-Popper perovskite oxides phase diagram. All the density-functional theory based relaxed crystal structures, used in the main text, are included. 2. Polarization switching paths of Ruddlesden-Popper perovskite oxides. We also include Python scripts that are used to analyse the energy, polarization and octahedral rotation angle of a specific crytal structure.Integration of ferroelectric materials in novel technological applications requires low coercive field materials, and consequently, design strategies to reduce the ferroelectric switching barriers. In this first principles study, we show that biaxial strain, which has a strong e ect on the ferroelectric ground
states, can also be used to tune the switching barrier of hybrid improper ferroelectric Ruddlesden-Popper oxides. We identify the region of the strain-tolerance factor phase diagram where this intrinsic barrier is suppressed, and show that it can be explained in relation to strain induced phase transitions to nonpolar phases.This work was supported primarily by the National Science Foundation through the University of Minnesota MRSEC under Award Number DMR-2011401Birol, Turan; Li, Shutong. (2020). Suppressing The Ferroelectric Switching Barrier in Hybrid Improper Ferroelectrics. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/hvr3-bg02
Squalius kottelati Turan, Yilmaz & Kaya, 2009, new species
No full textSqualius kottelati, new species (Fig. 1) Leuciscus lepidus Heckel, 1843: Gruvel, 1931: 294 (Orontes River) Leuciscus lepidus Heckel, 1843: Kosswig & Battalgil, 1943: 22 (Orontes River) Leuciscus lepidus Heckel, 1843: Ladiges, 1960: 122 (Orontes River) Leuciscus lepidus Heckel, 1843: Yalçın, 1997: 4 (Orontes River) Leuciscus lepidus Heckel, 1843: Bogutskaya, 1997: 173 (Orontes River) Holotype: FFR 1991, 126 mm SL, Turkey: Gaziantep Prov.: Orontes River drainage, Tahtaköprü Reservoir; D. Turan & S. Engin, 15 July 2007. Paratypes: FFR 1567, 13, 130 – 203 mm SL; same data as holotype. FRR 768, 5, 93–153 mm SL; Turkey: Kahramanmaraş Prov.: Ceyhan River; Menzelet Reservoir; Geçit Stream on road from Kahramanmaraş to Andırın; D. Turan, Z. Bostancı & Ş. G. Kırankaya, June 2005. - FRR 769, 5, 197 – 218 mm SL; Turkey, Adana Prov.: Seyhan Reservoir; D. Turan & Z. Bostancı, 20 June 2005. Diagnosis. Squalius kottelati is a member of the S. lepidus group, diagnosed by an elongate and pointed head with projecting lower jaw and the posteriorly expanded lateral portions of the parietals (Bogutskaya 1994). Squalius kottelati is distinguished from the other species of the genus Squalius in Turkey and adjacent basins by having a conspicuous broad, dark stripe on the upper part of the flank from the head to the end of the caudal peduncle (vs. absent or very faintly marked, except in S. lepidus). It differs from S. lepidus by having a longer head (28.3–30.9, vs. 25.3–27.3 % SL), fewer scales in lateral line (total 45–47, vs. 48–49) and fewer gill rakers on the outer side of first gill arch (9–10, vs. 11–13). It also differs from S. anatolicus by having more scales in lateral line (45–47, mode 46, vs. 43–45, mode 44); a longer caudal fin (length of upper lobe: 20.3–22.5, vs. 15.8 –19.0 % SL). Other characters useful for identification are: snout pointed in males, slightly rounded in females; anal fin with 8–9 ½ branched rays, its outer margin straight or slightly convex, with light-brown pigments on rays. Description. General appearance is shown in Figure 1; morphometric and meristic data are given in Tables 1 and 2. Body slender, slightly compressed laterally, depth at dorsal-fin origin 20.7–25.1 % SL. Dorsal profile slightly convex, with a hump at nape; dorsal profile more convex than ventral profile. Head long, slender, its length 1.2–1.4 times body depth; dorsal profile straight on interorbital area, concave on snout. Snout short, its length 26.8–29.8 % HL, slender, narrower, tip slightly pointed. Mouth slightly superior, long, narrow, angle of gape reaching vertical through anterior margin of eye. Lower jaw markedly longer than upper jaw, especially in specimens larger than 180 mm SL. Eyes large, diameter 15.8–19.5 % HL. Interorbital area narrow, its width 27.9–31.9 % HL. Maximum known size 203 mm SL. Dorsal fin with 3 simple and 8 ½ branched rays, approximately equal to pectoral-fin length, distal margin straight, origin markedly behind vertical through pelvic-fin origin. Pectoral-fin distal margin straight, with 16–17 branched rays. Pelvic-fin distal margin straight, with 1 simple and 8 branched rays. Anal fin with 3 simple and 8–9 ½ branched rays; distal margin straight or slightly convex. Caudal fin long, length of upper lobe 20.3–22.5 % SL, markedly forked, lobe tips pointed. Lateral line with 45 (3), 46 (8) or 47 (3) scales; 7 (9) or 8 (5) scales rows between lateral line and dorsal-fin origin; 3 (4) or 4 (10) scales between lateral line and anal-fin origin. Gill rakers 3 + 6–7 = 9–10 on outer side of first gill arch. Vertebrae 23 + 19 = 42 (6) or 24 + 19 = 43 (8). Pharyngeal teeth 5.2 – 2.5, markedly hooked, serrated. The snout of males is more pointed than that of females. Coloration. Formalin-preserved adults and juveniles dorsally dark grey, grayish on flank, whitish on belly; a conspicuous broad, dark stripe on upper part of flank from head to end of caudal peduncle. Caudal fin dark grey. Dorsal, pectoral, pelvic and anal fins yellowish. Light-brown pigments on dorsal and anal-fin rays. Scales with a dark spot on scale pocket, especially in specimens larger than 180 mm SL; faintly marked to distinct dark edge along posterior margin; usually with one or two rows of large black pigments on posterior margin of scales of flank and dorsum. Etymology. The species is named for Maurice Kottelat, fish taxonomist, in appreciation for his contributions to knowledge of the fish faunas of Europe and Asia. Distribution. Squalius kottelati is presently known only from Tahtalıköprü reservoir in the drainage of Orontes River, drainages of Ceyhan and Seyhan rivers (Fig. 2). Capoeta barroisi has been collected together with S. kottelati. Lateral-line scales Species N 43 44 45 46 47 48 49 mean S. lepidus 10 - - - - - 6 4 48.4 S. anatolicus 14 4 6 4 - - - - 44.0 S. kottelati 14 - - 3 8 3 - - 46.0 Transverse-line scales Above lateral line Below lateral line N 7 8 9 10 11 Mean 3 4 5 6 mean S. lepidus 10 - 10 - - - 10.0 2 8 - - 3.8 S. anatolicus 14 5 9 - - - 7.6 8 6 - - 3.5 S. kottelati 14 9 5 - - - 7.4 4 10 - - 3.7 Branched dorsal-fin rays Pectoral-fin rays Branched anal-fin rays N 7 8 9 mean 16 17 mean 8 9 10 mean S. lepidus 10 - 1 - 8 2 8 16.8 - 6 4 9.4 S. anatolicus 14 2 9 3 8.1 9 5 16.4 2 10 2 9.0 S. kottelati 14 - 14 - 14 8 6 16.4 6 8 - 8.6 Gill rakers N 8 9 10 11 12 13 mean S. lepidus 10 - - - 6 2 2 11.6 S. anatolicus 14 3 7 4 - - - 9.1 S. kottelati 14 - 4 10 - - - 9.7Published as part of Turan, Davut, Yilmaz, Togay & Kaya, Cüneyt, 2009, Squalius kottelati, a new cyprinid species (Teleostei: Cyprinidae) from Orontes River, Turkey, pp. 53-62 in Zootaxa 2270 on pages 54-58, DOI: 10.5281/zenodo.19094
The situation of the genus Dianous (Staphylinidae: Steninae) in Turkey and its dark spots in the World Zoogeography
No full textThe Staphylinidae family is the most species-rich and ecologically diverse insect family (Parker, 2017).
Steninae is one of the most species-rich subfamilies in Staphylinidae and has two genera. One of them
is Stenus and the other is Dianous. The genus Dianous has 262 species (Puthz, 2016, 2021). In Turkey,
only two species belonging to the genus Dianous were identified and three subspecies of one of these
species were given (Puthz, 1979, 1981, 2002; Turan&Sert, 2019, 2021). When the studies carried out in
Turkey are examined, it has been seen that there are very few studies on this genus in our country. Only
records from the Eastern Black Sea Region, Erciyes Mountain in the Central Anatolia Region, Sultan
Mountains in the Aegean Region, Adana in the Mediterranean Region and Bilecik in the Marmara
Region are given. Apart from these records, there is no study conducted in other regions of Turkey and
potential habitats of species belonging to this genus. For this reason, the Dianous fauna of Turkey is not
known clearly.
When the world zoogeographic distribution of the genus Dianous is examined, it is seen that there are
some question marks. The east of Turkey's Anatolian diagonal is completely uncertain. In addition, there
are no records other than Bilecik and Sultan Mountains in the west. However, there are no records of
this genus in most of Iran after Turkey, Turkmenistan and a large area of Afghanistan. The question
asked here is; why there is no species in these regions?
A comprehensive project proposal has been prepared for TÜBITAK in order to reveal the faunistic
situation of the genus Dianous in Turkey, to evaluate the zoogeographic situation in the world, to
evaluate the future situation of the habitats of this genus, which only lives in waterfall habitats, due to
climate change
Implementation of the Objectives of Regional Development at Regional Level: Experiences of Kazakhstan and Russia
No full textЦели устойчивого развития, принятые на Генеральной Ассамблее ООН 25 сентября 2015 г., охватывают
широкий спектр проблем, с которыми сталкиваются как развивающиеся, так и развитые страны. Поэтому
приобретает особую важность идентификация и обобщение национальных подходов к имплементации ЦУР
на региональном уровне в двух постсоветских странах – Казахстане и России, для которых характерно на-
личие значительного государственного сектора, активное использование прямых административных мето-
дов регулирования экономики. Цель исследования – провести сравнительный анализ используемых подходов
к имплементации ЦУР на уровне регионов. В ходе исследования предложены критерии для характеристи-
ки участия государства в процессах внедрения ЦУР на национальном и региональном уровнях, проведено
сравнение подходов к институционализации ЦУР в рамках общегосударственной политики, сопоставлены
содержательные приоритеты деятельности центральных правительств и региональных органов власти, вы-
явлена специфика локализации и имплементации ЦУР на уровне регионов. В результате выявлены различия
в используемых formal institutional practices and structures, выборе приоритетных для локализации и импле-
ментации ЦУР, возможностях ресурсного обеспечения управленческих решений, принимаемых на общена-
циональном и региональном уровнях. С учетом того, что исследуемые страны находятся на начальном этапе
процесса локализации и внедрения ЦУР на региональном уровне, разработанные рекомендации будут ис-
пользованы для совершенствования работы в данном направлении. / The Sustainable Development Goals adopted by the UN General Assembly on September 25, 2015, cover a wide range of problems faced by both developing and developed countries. Therefore, it is of particular importance to identify and summarize national approaches to SDG implementation at the regional level in two post-Soviet countries – Kazakhstan and Russia, which are characterized by the presence of a significant public sector and the active use of direct administrative methods of regulating the economy. The purpose of the study is to conduct a comparative analysis of the approaches used to implement the SDGs at the regional level. The study proposes criteria for characterizing state participation in the SDG implementation processes at the national and regional levels, compares approaches to the institutionalization of the SDGs within the framework of national policy, compares the substantive priorities of the activities of central governments and regional authorities, and identifies the specifics of localization and implementation of the SDGs at the regional level. As a result, differences were identified in the formal institutional practices and structures used, the choice of priorities for localization and implementation of SDGs, and the possibilities of resource provision for management decisions made at the national and regional levels. Considering that the countries under study are at the initial stage of the process of localization and implementation of SDGs at the regional level, the developed recommendations will be used to improve work in this area
Capoeta baliki Turan, Kottelat, Ekmekci and Imamoglu 2006
No full textCapoeta baliki Turan, Kottelat, Ekmekçi and İmamoğlu, 2006 Types. Holotype. ESFM-PISI/ 2004-74, 202 mm SL; Turkey: Ankara: Sakarya River: Kızılcahamam Stream, Kızılcahamam, 60 km west of Ankara, 40°29' N 32°39' E; D. Turan, M. Turan, 15.04.2004. Paratypes. ESFMPISI/2004-75, 4, 140–190 mm SL; FFR 713, 5, 121–219 mm SL; CMK 18541, 10, 128–188 mm SL; same data as holotype. FFR 714, 5, 151-209 mm SL; Turkey: Ankara: Sakarya River, Ova Stream, Kazan, 50 km west of Ankara, 40°11' N 32°39' E; D. Turan, M. Turan, 15.04.2004. FFR 715, 5, 121-183 mm SL; same data, 16.06.2004. FFR 716, 10, 168-217 mm SL; Turkey: Sıvas: Kızılırmak River, Delice Stream; F. Ekmekci, S. Kırankaya, 22.11.2002 (after Turan et al., 2006 b). T y p e L o c a l i t y. Sakarya River. D i a g n o s i s. Meristic characters (tables 1–4): D: III–IV 8–9 (8.1), P: I 17–20 (18.4), V: I 9–10 (9.0), A: III 5, lateral line: 72–86 (78.4), scales number above/below lateral line: 14–17 (14.9)/10–11 (10.1). C. baliki is distinguished from other Capoeta species of East and South-East Black Sea rivers (C. svanetica sp. n., C. sieboldi, C. oguzelii, C. banarescui, C. ekmekciae, and also from C. tinca of Marmara Sea basin) by the combination of characters. Two pairs of barbels (C. sieboldi and C. oguzelii have only one pair); gill rakers number (16–22 (19.3)) higher than in C. svanetica sp. n., C. banarescui and C. oguzelii but less than for C. sieboldi; last unbranched dorsal-fin ray well ossified with the high number of serrae (unlike C. sieboldi and C. oguzelii); 14–17 scales rows above the lateral line and 10–11 scales rows below the lateral line (more than in C. svanetica sp. n., C. sieboldi, and C. banarescui). C. baliki also characterized by less length of anterior and posterior barbels 9.8–14.3 (mean 12.7) and 14.7–18.5 (mean 16.5) respectively than the same parameter for C. svanetica sp. n. (13.9–20.1 (mean 16.7) / 18.7–28.6 (mean 22.2)) and C. banarescui (12.4–20.8 (mean 16.9) / 18.4–28.8 (mean 21.9)). Distribution. C. baliki is presently known from the Sakarya and Kızılırmak river drainages (Turkey), including lakes and reservoirs (Turan et al., 2006 b; Elp et al., 2018).Published as part of Roman, A., Afanasyev, S., Golub, O. & Lietytska, O., 2022, Capoeta Svanetica (Teleostei, Cyprinidae), A New Species From The Luchunis River (Rioni River Drainage) In Georgia, pp. 117-134 in Zoodiversity 56 (2) on pages 130-131, DOI: 10.15407/zoo2022.02.117, http://zenodo.org/record/717568
Evaluation of Aircraft Descent Profile
No full textAbstractPoint Merge System (PMS) is a new method for merging and sequencing arrival traffic flows. It consists of sequencing legs, merge point. PMS allows Continuous Descent Approaches (CDAs) which reduces environmental impacts according to aircraft noise, fuel burn and emissions during approach. Aircraft could descend continuously from an optimal position in a low drag with minimum engine thrust. In this study, PMS arrival procedure model will be designed and vertical descent profiles of aircraft will be assessed both in terms of vectoring and PMS. The results show that PMS model achieves more standard vertical descent profiles over vectoring
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