2,369 research outputs found
First-principles study of structural, mechanical, lattice dynamical and thermal properties of nodal-line semimetals ZrXY (X=Si, Ge; Y=S, Se)
No full textThe nodal-line semimetals are new and very promising materials for technological applications. To understand their structural, mechanical, lattice dynamical and thermal properties in detail, we have investigated theoretical study of ZrXY (X = Si, Ge; Y = S, Se) using Density Functional Theory for the first time. Obtained lattice parameters are in excellent agreement with previous experimental data. These nodal-line semimetals obey the mechanical stability conditions for tetragonal structure. We obtain Bulk modulus, Shear modulus, Poisson's ratio, Pugh ratio, sound velocities and thermal conductivity using elastic constant. All the materials behave in brittle manner. Poisson's ratio data and Bader charge analysis results indicate that the ionic bonding characters are dominant. Next, the lattice dynamical properties are calculated. Phonon density of states shows that nodal-line semimetals ZrXY are also dynamically stable in the tetragonal structure. Raman and IR active phonon modes are determined. Highest optical mode at gamma point corresponds to A(2u) (IR active) and E-g (Raman active) modes for ZrXSe and ZrXS, respectively. Based on phonon density of states, thermal properties such as Helmholtz free energy, entropy, heat capacity at constant volume and Debye temperature are also presented and discussed
The revision of genus Seseli (Umbelliferae) in Turkey
No full textSeseli L. is represented by 12 taxa (species and subspecies) in the Flora of Turkey. On the basis of morphological examination and field investigation, we have revised the genus Seseli in Turkey. The following are provided for each taxon: a description, along with the complete synonymy and notes on nomenclature, geographical distribution, habitat, IUCN conservation status assessment, and selected materials examined. Two new species from Turkey, Seseli marashica E. Dogan & H. Duman and S. serpentina B. L. Burtt ex H. Duman & E. Dogan, are also described. One taxon is reduced to synonymy: S. paphlagonicum Pimenov & Kljuykov is a synonym of S. gummiferum Pallas ex Smith. Moreover, one species is reduced to the rank of subspecies: S. corymbosum Boiss. & Heldr. ex Boiss. subsp. phrygium (Pimenov & Kljuykov) E. Dogan & H. Duman. According to the present revision, the genus contains 13 taxa (species and subspecies)
Turkish cashier problem: a new application of the traveling salesperson problem
No full textDuman, Ekrem (Dogus Author)In this study a new special case and a new application of the traveling salesman problem is introduced which is named as the Turkish cashier problem. For this problem, first the theoretical background is established and then a heuristic procedure is developed which performs very successfully for the pseudo-real problems
Ferula ermenekense Sagiroglu & H. Duman 2023, sp. nov.
No full textFerula ermenekense Sağıroğlu & H. Duman sp. nov. (Figs.1–2) Type:― Turkey. C4 Karaman: Ermenek, Görmeli Village, 850 m elevation, 11 June 2021, M. Sağıroğlu 7003 (holotype SAKU!; isotypes GAZI!, SAKU!). Diagnosis:― Ferula ermenekense is partly similar to F. lycia, F. duranii and F. pisidica as habitus, but is easily distinguished from F. lycia by its sparsely scabrid basal leaves (versus glabrous), 4–10 × 1–3 mm (versus 1–2 × 0.5–1 mm), acuminate apex of ultimate segments (versus acute), erect lateral umbels (versus ascending), obovate-elliptic mericarps (versus orbicular-oblong). It differs from F. duranii by having 4–5 pinnate and sparsely scabrid basal leaves (versus 6–7 pinnate), very reduced lamina of sheaths (versus distinctly leafy), obovate-eliptic mericarps (versus narrowly elliptic-oblong) and differs from F. pisidica by having sparsely scabrid basal leaves (not setulose), acuminate ultimate segment (versus obtuse), erect lateral umbels (versus ascending), glabrous petals (versus setulose), obovate-elliptic mericarps (versus oblong). Perennial, polycarpic herbs. Rootstock well developed, woody, thick, cylindrical, 1–5 cm diameter, fibrous collar present, dense, to 8 cm long. Stem 100–150 cm height, stout, terete, sulcate, ± glaucous, glabrous, 1–2.5 cm diameter at base. Basal leaves triangular-ovate in outline, 40–62 × 16–35 cm; petioles 10–18 cm long, terete, sulcate, glabrous; lamina 4–5(–6) pinnate; ultimate segments linear (2–)4–10(–12) × 1–3 mm, glaucescent, scabrit to sparsely scabrid, acuminate. All sheaths amplexicaul, coriaceous, sulcate, glabrous; lower sheaths lanceolate, 5–10 × 3–5 cm; middle sheaths broadly lanceolate, 8–16 × 3.5–8.3 cm; upper sheaths broadly inflated, ovate, 5–7 × 2.5–4 cm lamina very reduced. Inflorescence dense paniculate-corymbose, very dense with umbels, long branched; central umbels sessile or peduncled, 0.5–18 mm long; 14–26 rays, 2.5–3.5 cm long; lateral umbels usually fertile, 2–4, 8–12 rays, 1.5–2.5 cm long, erect, thin and long peduncled; central umbels usually 10–18 flowers, lateral umbels 12–23 flowers; central umbel’s pedicels 7–10 mm long, lateral umbels pedicels 5–7 mm. Bracteol usually absent, sometimes 2-3, 0.1–0.2 mm, uncertain. Sepals obsolete. Petals yellow, glabrous, 2 mm long, deflexed. Stamen yellow, flaments 2–2.5 mm long, anthers 0.7–1 mm long, oblong. Stylus 2.5–3 mm long, persistent, stigma weakly capitate; stylopodium nearly flattened, weakly conical, fruit dorsaly compressed, brown when ripe; mericarps obovate-elliptic, 9.02–15 × 5.02–7.50 mm, dorsal ridges filiform, lateral wings 0.5–0.7 mm wide; dorsal vittae per valecula 1–2, commissural 6–8. Flowering May-June, fruiting July-August. Phenogical data:―The rootstock of the plant, which spends autumn and winter in dormancy, gives leaves in February-March, stem and branches in April-May, flowers in May-June, fruit in July-August respectively. Flowering in the population begins in the last week of May. Opening of flowers and the appearance of visible anthers begins at the end of May and continues until mid-July. It goes into fruiting after mid-June and the full ripening of the mericarp is in July-August. The opening of the ripened mericaps and the dispersal of the mericarps can continue until the end of August. At the end of the development cycle, the entire plant ages and takes on a light brown appearance. Eponymy:―The specific epithet (ermenekense) of new species is derived from Ermenek district in Karaman province, where the new species was first discovered. Turkish common name of the new species:― Ferula species are called “Çakşır,” in Turkish. The authors propose “Ermenek Çakşırı” as a vernacular name for F. ermenekense according to the guidelines of Menemen et al. (2016). Paratypes:― Turkey. Karaman; Ermenek, Görmeli Village, 1100 m elevation, 11 June 2021, M. Sağıroğlu 7001 & H.Duman; Ermenek, Görmeli village, 800 m elevation, 20 August 2021, M. Sağıroğlu 7056; ibid., 20 Agust 2021, M. Sağıroğlu 7039 & B. Şahin; ibid., 23 August 2021, M. Sağıroğlu 7059 & B. Şahin (SAKU!, GAZI!). Distribution, Habitat and Ecology:―Ermenek region in Karaman province, where Ferula ermenekense is described, is located within the Irano-Turanian phytogeographic region on the border of the Mediterranean phytogeographic region (Figs. 1–6). This region has high mountainous and valleyed areas isolated from its surroundings and includes species confined to the region. This region is rich with local endemics and has high plant diversity.A large number of new species have recently been described from this area, e.g. Silene duralii Bağcı (2008:11) Rhaponticoides aytachii Bağcı, Doğu & Dinç (2009: 479), Gagea goekyigitii Eker & Tekşen in (2017: 23), Haplophyllum ermenekense Ulukuş & Tugay (2018: 121), Silene goksuensis Budak, Hamzaoğlu & Koç (2018: 171) and Gladiolus izzet-baysalii Eker & Sağıroğlu (2021:98) (Bağcı 2008, Doğu et al. 2009, Tekşen & Eker 2017, Ulukuş & Tugay 2018, Budak et al. 2018, Eker & Sağıroğlu 2021). Ferula ermenekense grows in Pinus nigra J.F.Arnold, Abies cilicica subsp. cilicica (Antoine & Kotschy) Carrière, Juniperus oxycedrus L. forest openings and clayey soils on limestone bedrocks between 800 to 1100 m. Species conservation assessment:― Ferula ermenekense is known from only one location with an extent of occurrence (EOO) estimated to be less than 100 km 2 and an area of occupancy (AOO) estimated to be less than 10 km 2. The population size of the species was noted as less than 100 mature individuals. We have noticed some threats to its existence such as broading road works, fire, and habitat degradation. Due to continuing decline projected in the extent of occurrence, area of occupancy, extent and quality of habitat, and number of mature individuals, it should be classifed as Critically Endangered (CR) based on criteria B1ab (i,ii,v) + B2ab (i,ii,v) (IUCN 2019). Mericarp morphology:―Fruit in the genus Ferula has taxonomically distinctive and determinative characters, as in other genera of Apiaceae (Cauwet-Marc 1981 a, 1981b, Safina & Pimenov 1983, 1990, Arenas Posada & García Martín 1993, Duman & Sağıroğlu 2005, Sağıroğlu & Duman 2007, 2010, Pimenov & Kljuykov 2013, Bani et al. 2016, Brullo et al. 2018). The fruit is distinctly cremocarp. It consists of two mericarps separated by a carpophore. Carpophore holds the two mericarps together. The mericarps are usually compressed dorsally. Each mericarp has five wings. Three of them are on the dorsal and two are on the lateral (marginal) side. In correspondence of each one there is a vascular bundle. In order to verify the taxonomical relationships among Ferula ermenekense and the morphologically similar species F. lycia, F.duranii and F. pisidica, their mericarps were investigated. Especially, F. ermenekense shows obovoidelipsoid mericarps, 9.02 -15.01× 5.02–7.50 mm, with wings 0.5–0.7 mm wide, dorsal vittae 1–2 per vallecula, and commissural vittae 6–8 (Fig. 2-f); F. lycia has orbicular-oblong mericarps, 7–10 × 4–7 mm, with wings 1–1.5 mm wide, dorsal vittae per vallecula 1, and commissural vittae 2–4 (Sağıroğlu &Duman 2010); F. duranii has narrowly elipsoidoblong mericarps, 6–10 × 3–5 mm, with wings 0.3–0.5 mm wide, dorsal vittae per vallecula 2–3, and commissural 4–6 (Sağıroğlu & Duman 2010); F. pisidica has oblong mericarps, 8–14 × 4–9 mm, with wings 0.5–1 mm wide, dorsal vittae per vallecula 1–3, and commissural (2–)4–6 (Akalın et al. 2020, Figs. 1-6) Comparative mericarp micromorphology with close species:― Ferula ermenekense differs from F. lycia in terms of mericarp dimensions (L × W × T) (9.02–15.01 × 5.02–7.50 × 1.92–2.03 mm versus 7.00–10.3 × 4.00–7.01 × 1.25–1.50 mm), shape (obovate-eliptical versus rounded-oblong), ornamentation on the mericarp body and wings (rugulose-granules versus rugulose-reticulate), epicuticular wax on the mericarp body (crust; sparsely irregular platelets versus smooth layer; irregular and sparsely platelets), anticlinal cell walls (inconspicuous, regularly thickened and straight versus conspicuous, sunken, ribbed, undulate), epidermal cell shape (incospicous more or less isodiametric, polygonal versus conspicous more or less isodiametric, especially quadrangle polygonal). Ferula ermenekense differs from F. duranii in terms of shape (obovate-eliptical versus narrowly elliptical-oblong), epicuticular wax on the mericarpbody (crust; sparsely irregular platelets versus smooth layer; diffuse, dense, irregular and nonentire platelets), anticlinal cell walls (inconspicuous, regularly thickened and straight versus inconspicuous, irregularly thickened and straight), periclinal cell walls (flat versus concave). Ferula ermenekense differs from F. pisidica in terms of shape (obovate-eliptical versus oblong), ornamentation on the mericarp body and wings (rugulose-granules versus rugulose-reticulate), epicuticular wax on the mericarp body (crust; sparsely irregular platelets versus smooth layer; tiny and very sparsely irregular platelets), anticlinal well walls (inconspicuous, regularly thickened and straight versus inconspicuous, irregularly thickened and minutely raised to straight). All species are akin to each other by their light brownish-dark brown mericarp colour, rugose-smooth and well-developed cuticle type on the mericarp body, flat-convex-concave periclinal cell walls (Table 2, Fig. 5). Taxonomic relationships:― Ferula lycia, F. duranii and F. pisidica are endemic species that spread above 1000 m in the southern Turkey. F. lycia has a relatively wider distribution area than the other species. However, it is not seen in any other area in Turkey apart from this region. Other species F. duranii and F. pisidica are distributed in two localities in very narrow areas in this region. Morphological and micromorphological characters were evaluated to reveal the difference of Ferula ermenekense from its morphologically related species. (Table 1–2, Figs. 1–3). Ferula ermenekense can be easily distinguised from F. lycia by having linear and sparsely scabrid ultimate segments (versus oblong to linear and glabrous), dense umbel inflorescence (versus lax), erect lateral umbels (versus ascending), 14–26 rays (versus 6–16), 15–23 flowers (versus 10–15), obovoid to ellipsoid mericarp and 6–8 commussural vittae (orbicular to oblong and 2–4 commussural vittae). It differs from F. duranii by having 4–5 pinnate and sparsely scabrid basal leaves, very redused of upper sheaths lamina, 15–23 flowers, mericarps obovoid to ellipsoid. The new species also differs from F. pisidica because of having with sparsely scabrid basal leaves (versus setulose), acuminate ultimate segment (versus obtuse), with dense umbel inflorescence (versus lax), erect lateral umbel (versus ascending), glabrous petals (versus setulose), obovoid to elipsoid mericarp (versus oblong) (Table 2). Ferula ermenekense ultimate segments are significantly different when compared with the other three species (Table 2, Fig. 3). Ultimate segments of Ferula ermenekense and F. duranii are acuminate. However, the ultimate segments of F. ermenekense are wider than those of F. duranii 1–1.2 mm (versus 0.4–08 mm). Ultimate segments of Ferula ermenekense are acuminate, however they are acute in F. lycia and obtuse in F. pisidica. The new species is also different from the other three species by the peculiar characteristics of its sheaths (Table 3, Fig 4). Ferula ermenekense sheaths are broadly lanceolate, whilo those of F. pisidica and F. lycia are ovate. As regards F. duranii sheaths, they are lanceolate and densely leafy. Selected specimens examined:― Ferula lycia. Turkey ― Antalya: in regione alpina montium Lycia supra Elmalı, Bourgeau (holotype G; photo GAZI!); Burdur: Yeşilova opposite lake Salda, 2001 Ş. Yıldırımlı 26802 & M. Dinç (Hb. YILDIRIMLI!); Burdur: Yeşilova, 2001 Ş. Yıldırımlı 26815 (Hb. YILDIRIMLI!); Antalya: Bakırlı Dağ, 10. July. 1999 H. Duman 7074 (GAZI!); ibid., 14. July. 2002 A. Duran 5813 (GAZI!). ― Konya-Hadim road 91 km, Eğişte Deresi, 900 m, 10. June. 2021, M. Sağıroğlu 6889 (SAKU!); ibid.,ibidem 20.08.2021, M. Sağıroğlu 7038(SAKU!); ―C4 Konya: Konya-Hadim road, 90 km, 20. July. 2002 M. Sağıroğlu 2164 (Fig. 9, GAZI!). Ferula duranii:― TURKEY. C3 Antalya: Akseki-Çukurköy, Istarlas Mountain, 900–950 m of elevation, 25 May 2002, M. Sağıroğlu 1896 & E. Akçiçek (holotype GAZI; isotypes ANK!, Hb.Yıldırımlı, E);ibid., 20. July. 2002, M. Sağıroğlu 2163 (GAZI!); ibid., 20 July 2002, M. Sağıroğlu 2240 (GAZI!); ibid., 19 July 2001, A. Duran 4129 (GAZI!); Antalya: Alanya Castle, 50 m of elevation, 12 Agust 2006, M. Sağıroğlu 2606 & F. Karavelioğulları (GAZI!). Ferula pisidica: — TURKEY. Konya: Konya-Hadim, Beyreli Village, forest opening, 1488 m of elevation, 13 June 2021, M. Sağıroğlu 7021 (SAKU!); ibid., 1898 m of elevation, 13 June 2021, M. Sağıroğlu 7022 (SAKU!); ibid., 1540 m of elevation, 13 June 2021, M. Sağıroğlu 7024 (SAKU!); ibid., 1600 m of elevation, 13 June 2021, M. Sağıroğlu 7025 (SAKU!); ibid., 1488 m of elevation, 22 August 2021, M. Sağıroğlu 7043 (SAKU!); ibid., 1795 m of elevation, 22 August 2021, M. Sağıroğlu 7044 (SAKU!); 1900 m of elevation, 22 August 2021, M. Sağıroğlu 7045 (SAKU!); ibid., 1600 m of elevation, 22 August 2021, M. Sağıroğlu 7046A (SAKU!); ibid., 1500 m of elevation, 22 August 2021, M. Sağıroğlu 7047 (SAKU!); ibid., 1950 m of elevation, 22 August 2021, M. Sağıroğlu 7048 (SAKU!); ibid., 1400 m of elevation, 22 August 2021, M. Sağıroğlu 7049 (SAKU!); Konya-Hadim, near Beyreli Village, 1550 m of elevation, 26 June 2015, M. Miski, E. Akalın & S. Anıl (holotype: ISTE 117051!).Published as part of Sağiroğlu, Mehmet & Duman, Hayri, 2023, Ferula ermenekense (Apiaceae), an interesting new species from Southern Anatolia in the eastern Mediterraenean Basin, pp. 51-62 in Phytotaxa 597 (1) on pages 52-60, DOI: 10.11646/phytotaxa.597.1.6, http://zenodo.org/record/791879
Ab initio investigations of phonons and superconductivity in the cubic Laves structures LaAl2 and YAl2
No full textWe have performed an ab initio study of structural, elastic, electronic, lattice-dynamical, and electron-phonon interaction properties of the cubic Laves structures LaAl2 and YAl2. The calculations have been carried out within the density-functional theory and linear response formalism using pseudopotentials and a plane-wave basis. The calculated phonon dispersion relations for both materials accord very well with experimental data available for the principal symmetry directions. The average electron-phonon coupling constant lambda is found to be 0.35 for YAl2 and 0.65 for LaAl2. Thus, our results indicate the superconducting transition temperature is very low for YAl2 but a superconducting transition temperature T-c of around 3 K for LaAl2 is found with mu* = 0.16. Finally, we have observed that the soft phonon modes related to the vibrations of La atoms play a dominant role in the superconductivity of LaAl2. (C) 2012 American Institute of Physics. [doi:10.1063/1.36813271
Türkiye Sideritis L. türlerinin revizyonu
No full text31.08.2005Yapılan revizyon çalışması sonucunda Türkiye'de yayılış gösteren bütün Sideritis L. türleri arazi gözlemleri ve bol materyale dayalı olarak yeniden revize edilmiş bunun sonucunda Türkiye Sideritis' leri 44 tür (55 takson) altında toplanmıştır. Bu sonuca göre bilim dünyası için yeni tür 2 tür (Sideritis aytacii H. Duman & P. Şahin sp. nov., Sideritis kirimerae H. Duman sp. nov.); Sideristis amasiaca Bornm. türüne ait 2 alttür (subsp. chorumensis H. Duman subsp. nov., subsp. karabukensis H. Duman subsp. nov.) tanımlanmıştır. Ayrıca 3 taksonun statüleri (S. erythrantha Boiss. & Heldr. apud Bentham subsp. cedretorum (P.H. Davis) H. Duman comb, et stat. nov., S. condensata Boiss. & Heldr. apud Bentham subsp. arguta (Boiss. & Heldr.) H. Duman comb, et stat nov., S. serratifolia Hub.-Mor. subsp. caesarea (H. Duman, Aytaç & Baser) H. Duman comb, et stat. nov.) değiştirilmiştir. Buna ilave olarak 2 tür sinonim yapılmış (S. armeniaca Bornm. türü S. galatica Bornm. türünün; S. huber-morathii Greuter & Burdet türü S. syriaca L. subsp. nusairiensis (Post) Hub.-Mor türünün), 2 taksonda ise Türkiye Florasında Huber-Morath tarafindan kabul edilen kategori değil diğer yazarların kabul ettikleri kategori benimsenmiştir [S. curvidens Stapf tür kategorisinde değil S. romana L. subsp. curvidens (Stapf.) Holmboe alttür olarak, S. libanotica Labill. subsp. microchlamys (Hand.-Mazz) Hub.-Mor. alttür değil S. microchlamys (Hand.-Mazz.) Bornm. tür olarak]. Bu proje kapsamında Türkiye'de yayılış gösteren 55 taksondan 52'sinin gövde ve yaprak anatomisi çalışılmış özellikleri ayrıntılı olarak verilmiş ve orijinal resim ve çizimlerle bulgular desteklenmiştir. Bu proje kapsamında Türkiye'de yayılış gösteren Sideritis cinsine ait Hesiodia, Burgsdorfla ve EmpedocHa seksiyonlarindaki toplam 55 takson'dan 52 tür ve tür altı seviyede taksonunda kromozom sayısı ile kromozom boyları, toplam haploid kromozom uzunluğu, B kromozomları ve miksoploidinin olup olmadığı belirlenmiştir. Uçucu yağ sonuçlara göre Sideritis türleri ana bileşikleri dikkate alınarak diterpen taşıyanlar: S. dichotoma, S. perfoliata; seskiterpen taşıyanlar: S. akmanii, S. albiflora, S. condensata subsp. arguta, S. brevibracteata, S. serratifolia subsp. caesarea, S. condensata subsp. condensata, S. galatica, S. leptoclada, S. microchlamys, S. libanotica subsp. violascens, S. niveotomentosa, S. phlomoides, S. serratifolia subsp. serratifolia, S. amasiaca subsp. karabukensis, S. tmolea, S. vulcanica; S. romana subsp. curvidens, S. montana subsp. montana, S. montana subsp. remota ve bunların dışında kalan türler monoterpenlerce zengin uçucu yağlara sahiptir. Sadece S. lanata da bir yağ asidi ana bileşik olarak belirlenmiştir
Kronik akciğer infeksiyonlu hastalardan izole edilen mantar cinsleri_Cuma Duman.
No full textTEZ261Tez (Uzmanlık) -- Çukurova Üniversitesi, Adana, 1985.Kaynakça (s. 50-56) var.56 s. res. 29 cm.
An experimental analysis of human factors on the system performance
No full textErensal, Yasemin Claire (Dogus Author) -- Duman, Ekrem (Dogus Author)It is often argued from an economic and ergonomic point of view that ergonomic considerations should be integrated into the planning processes, but it is seldom the case in practice. Tools for establishing this integration are available. The integrated framework developed and demonstrated in this paper examines the tradeoffs in including information about the human factors in system performance simulation models
TRANSFORMATION OF OWNERSHIP AND ITS CONSEQUENCES
No full textThis study aims to discuss an important issue that is directly related to the daily life of people, in particular, during their financial transactions and their social life. In detail, the article is discussing the method of transferring the ownership and its consequences such as illegal or forbidden earning that transfer the ownership from an owner to a new owner in a form of contract, for instant, selling or giving away. The research will also talk about the concept of transferring ownership, its legitimate reference and the argument of scholars about it. Moreover, in attempt to illustrate its significance, this study will mention some important examples of this concept as well as opinions of some scholars about how to treat individuals who illegally earn. One of the most important examples that matches this concept is the revenue that comes from the exploitation of occupation and transferring the financial-commercial organizations to Islamic-financial organizations. To the best of our knowledge, no previous researchers connect this concept with the jurisprudential applications, especially the recent ones and its interference with other jurisprudential branches.https://doi.org/10.28949/bilimname.59062
HANAFI DOCTRINE AND THE SHEIKH OF ISLAM HANAFI IN ALGERIA FROM THE OPENING OF NORTH AFRICA UNTIL INDEPENDENCE
No full textAnd we have compared Hanefi doctrine with the Maliki doctrine prevailing in Algeria It is noted in this study that Hanafi doctrine was present in North Africa since ancient times this is confirmed by Judge Ayyad, Ibn Khalkan, Dabbagh and Ibn al-Khoja...https://doi.org/10.28949/bilimname.49135
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