139,380 research outputs found
Alex Dimitrov
No full textPhotograph of poet Alex Dimitrov with the Sigmund Freud statue on Clark University\u27s campus green. He was there as part of the Henry J. Leir Chair\u27s programming for the 2014-2015 season with The Poetics of Desire: Alex Dimitrov Reads from Begging for It”.
Robert Tobin was the inaugural Henry J. Leir Chair in Language, Literature, and Culture from 2008 until his passing in 2022.https://commons.clarku.edu/funwithfreud/1007/thumbnail.jp
О некоторых дифференциальных операторах второго порядка
No full text[Dimitrov Dimitâr; Dimitrov D. G.; Димитров Димитр; Димитров Димитър Г.]Bulgarian. Russian, English summar
Coalition formation in simple Games. the semistrict core
No full textDimitrov D, Haake C-J. Coalition formation in simple Games. the semistrict core. Working Papers. Institute of Mathematical Economics. Vol 378. Bielefeld: Universität Bielefeld; 2006.We consider the class of proper monotonic simple games and study coalition formation when an exogenous share vector and a solution concept are combined to guide the distribution of coalitional worth. Using a multiplicative composite solution, we induce players' preferences over coalitions in a hedonic game, and present conditions under which the semistrict core of the game is nonempty
Pinkfloydia HORMIGA & DIMITROV 2011, GEN. NOV.
No full text<i>PINKFLOYDIA</i> HORMIGA & DIMITROV GEN. NOV. <p> <i>Type species:</i> <i>Pinkfloydia harveii</i> Dimitrov & Hormiga sp. nov.</p> <p> <i>Etymology:</i> The genus is named after the British psychedelic and progressive rock band Pink Floyd. In its heyday Pink Floyd was an innovative group that created music, which was an eclectic mixture of styles. The band also pioneered the use of very sophisticated lights and lasers in their live shows and often had highly innovative album covers. <i>Pinkfloydia</i> has very unusual morphological features and its name aims to reflect its uniqueness. <i>Pinkfloydia</i> is an undeclinable proper name and feminine in gender.</p> <p> <i>Diagnosis: Pinkfloydia</i> can be easily distinguished from all other tetragnathid genera by the conspicuously enlarged PME placed on short ocular protrusions and by the conical and distinctively elevated cephalic area (Figs 9A, 10A, 12A, 14G). All other eyes are placed at the same level on the prominent cephalic region and are much smaller in size (Figs 9B, 10C, 12A, D, 14E). Males of <i>Pinkfloydia</i> differ from other tetragnathid males in having several conspicuously large macrosetae at the base of the paracymbium (Figs 8A–C, 13A–D, G) and an area of the cymbium covered with numerous modified short setae (cuspules) concentrated dorsally on the cymbial ectomedian process (Figs 8B, E, 13A, C, H, I). In addition, the <i>Pinkfloydia</i> male palp has a well developed metine embolic apophysis and an embolus that carries numerous short denticles (Figs 8A–C, 13B, E, F, 14A); the cymbium has a well developed cymbial ecto-basal and cymbial ecto-median processes (Figs 8A, 13A, D).</p> <p>Females are diagnosed by the presence of a flat epigynal plate that has numerous pores opening on its ventral surface (Figs 8F, 15D–E, G; no similar plate has been described in any other member of Tetragnathidae). Copulatory openings are displaced caudally and hidden by the distal edge of the epigynum in a transversal groove (Figs 8G, H, 15F).</p> <p> <i>Description:</i> Tiny spiders, total length 2.77–3.75 in males, 3.54–4.51 in females (but note that so far <i>P. harveii</i> is the only known species in this new genus). Cephalothorax brown, longer than wide – 1.36–1.61 long in males and 1.68–1.86 in females – with a well marked fovea (Figs 9C, 10B); cephalic area conical, conspicuously elevated and slightly projected over the chelicerae (Figs 9A, 10A, 12A, 14G). Sternum slightly longer than wide; conspicuously narrower distally, and with a ridged cuticle (Figs 12C, 14J). AME slightly larger than ALE and PLE but much smaller than PME; PME much larger than the other eyes and placed over small rounded rises at the top of the elevated cephalic area; PLE and ALE juxtaposed over a slight elevation (Figs 12A, 14G). Clypeus height more than one AME diameter, slightly higher in males than in females. Chelicerae cylindrical, longer and slender in males, with three teeth on the anterior and two teeth on the posterior margin (Figs 12D, 14E). Chelicerae with two small denticles near the fang joint (Fig. 12I). Legs without dorsal femoral trichobothria in both sexes. Abdomen rounded with a prominent caudal tubercle, more elongated in males (Figs 12F, H, 15B, C). Spinneret morphology (studied in one male and two females) as in most other tetragnathid spiders: ALS with about 30 piriform gland spigots in females and about 20 in males, ordered roughly in four (females) or three (males) arched lines (Figs 14B, 16D). PMS with two aciniform gland spigots, between the cylindrical and the minor ampu- tate gland spigots (Fig. 16E, F). PLS with six aciniform gland spigots ordered in a straight line between the cylindrical spigots and the ‘araneoid triplet’ (Fig. 16G). Flagelliform and aggregate gland spigots well developed in females (Fig. 16G) but reduced in adult males (Fig. 14C). Flagelliform spigot conical, apically pointed; aggregate spigots with wider bases and wide sockets (Fig. 16G). Epiandrous fusules placed in a shallow epigastric groove and arranged in three groups separated by low cuticular ridges (Fig. 14D). Tracheal spiracle placed very close to the spinnerets. Tracheal system consisting of two longer lateral tubes and two shorter medial ones (Fig. 14F, I). All tracheal tubes confined to abdomen (i.e. do not enter the prosoma). Male pedipalp with very large modified setae on paracymbium (Figs 8A–C, E, 13A, B, G). Cymbium carrying cymbial ecto-basal and cymbial ecto-median processes (Figs 8A, B, E, 13A, D). A field containing numerous short modified setae (cuspules) arranged in longitudinal lines is placed dorsally over the cymbial ecto-median process, which extends over the cymbium (Figs 8E, 13A, C, D, H, I). Tegulum well sclerotized, large and spherical in shape (Figs 8A–C, 13B). Conductor and embolus coiling together and arising apically from the centre of the tegulum (Figs 8A, C, 13E, F). Conductor well sclerotized, with a robust apical apophysis (Fig. 13F). Embolus with robust metine embolic apophysis, dorsoapically with numerous short denticles and a distinctively slender apex (Fig. 13F). Spermatic duct enters the tegulum (towards the fundus) through the embolus base, widening in diameter shortly after (Fig. 8D). Spermatic duct without switchbacks and one and a half spiral turns before reaching the fundus (Fig. 8D).</p> <p>Female genitalia entelegyne, with a flat, well chitinized epigynum that has numerous pores dorsally (Figs 8F–H, 15D–H). These pores might be related to the secretions that form the epigynal plug observed in some of the specimens (Fig. 10E). Spermathecae oval with weakly sclerotized walls (Figs 8G, 15F, H).</p> <p> <i>Phylogenetics: Pinkfloydia</i> is a member of the Australian– New Zealand tetragnathid lineage <i>Nanometa</i> clade.</p> <p> <i>Natural history:</i> See under <i>P. harveii</i> sp. nov.</p> <p> <i>Composition:</i> The only known member of this genus is <i>P. harveii</i> sp. nov.</p> <p> <i>Distribution:</i> Western Australia (see under <i>P. harveii</i> sp. nov.).</p>Published as part of <i>Dimitrov, Dimitar & Hormiga, Gustavo, 2011, An extraordinary new genus of spiders from Western Australia with an expanded hypothesis on the phylogeny of Tetragnathidae (Araneae), pp. 735-768 in Zoological Journal of the Linnean Society (Zool. J. Linn. Soc.) (Zool. J. Linn. Soc.) 161 (4)</i> on pages 754-756, DOI: 10.1111/j.1096-3642.2010.00662.x, <a href="http://zenodo.org/record/5440041">http://zenodo.org/record/5440041</a>
Regrouping of endowments in exchange markets with indivisible goods
No full textDimitrov D, Haake C-J. Regrouping of endowments in exchange markets with indivisible goods. Working Papers. Institute of Mathematical Economics. Vol 367. Bielefeld: Universität Bielefeld; 2005.In this paper we are interested in efficient and individually rational exchange rules for markets with heterogeneous indivisible goods that exclude the possibility that an agent benefits by regrouping goods in her initial endowment. We present a suitable environment in which the existence of such rules can be analysed, and show the incompatibility of efficiency, individual rationality and regrouping-proofness even if agents' preferences are additive separable
M. Guénovsky et D. Dimitrov, Le fondement de l'Etat et du droit de la Bulgarie
No full textM. Guénovsky et D. Dimitrov, Le fondement de l'Etat et du droit de la Bulgarie. In: Revue internationale de droit comparé. Vol. 10 N°3, Juillet-septembre 1958. pp. 639-642
M. Guénovsky et D. Dimitrov, Le fondement de l'Etat et du droit de la Bulgarie
No full textM. Guénovsky et D. Dimitrov, Le fondement de l'Etat et du droit de la Bulgarie. In: Revue internationale de droit comparé. Vol. 10 N°3, Juillet-septembre 1958. pp. 639-642
Dysdera zonsteini Dimitrov 2021, new species
No full textDysdera zonsteini new species Figs 1–13 Type material. Holotype. ³. Turkmenistan, South-Western Kopet Dagh, near Kara-Kala Town, GPS: 38°28’N, 56°15’E, alt. 350–450 m, 21.04.1985, Sergei Zonstein leg. (MNHN, AR 5862). Paratype. 1♀, with same data as for holotype (MNHN, AR 5862). Etymology. Named after the well-known arachnologist Sergei Zonstein, who collected the type specimens. Diagnosis. Both male and female of Dysdera zonsteini n. sp. are morphologically close to Dysdera kronebergi Dunin, 1992. The two species can be separated by the following diagnostic characters: (1) the smaller size of D. zonsteini n. sp. [carapace length 1.65 vs. 2.45 in D. kronebergi]. Male of the new species differs also by (2) the strong process (PE) of the embolic division (Figs 7–9, 14) that is not seen in D. zonsteini (Dunin 1992, figs. 4–5) and (3) the overall shape of the tegulum and the embolic division of the bulb (Figs 7–10, 14–15). Female differs by (4) the thinner and straight transversal bar (Figs 12–13, 16–17) vs. more massive and with curved edges in D. kronebergi (Dunin 1992a, fig 6) and by (5) the more oval shape of the dorsal arc of the anterior diverticulum. The spermathecae of the two species are almost identical, but (6) in D. kronebergi it is wider than the dorsal arc of anterior diverticulum (Dunin 1992a, fig 6), while in D. zonsteini n. sp. it is narrower and its lateral wings do not exceed the width of the dorsal arc in its base (Figs 12–13, 16–17). Description. Male. (Figs 1–2, 5, 7–11, 14–15). Measurements. Total length 4.05; carapace length 1.65, width 1.18; sternum length 1.05, width 0.75; cheliceral length 0.72, width 0.25; clypeus height 0.05; labium length 0.40; gnathocoxa length 0.58; abdomen length 1.95, width 0.85; Eye diameters: AE—0.17, PE—0.14. Leg measurements. I—5.53 (0.92, 1.33, 0.77, 0.97, 1.04, 0.50); II—4.86 (0.83, 1.26, 0.43, 0.93, 0.94, 0.47); III—3.61 (0.65, 0.97, 0.43, 0.55, 0.65, 0.36); IV—4.66 (0.72, 1.13, 0.58, 0.86, 0.97, 0.40). Leg spination: coxae, trochanters and patellae spineless. Legs I and II have only one distal prolateral femoral spine, legs III and IV with well-armed femur and metatarsus. I—1pl, 0, 0; II—1pl, 0, 0; III—1d, 5pl 5rl, 5pl 2rl; IV—4d, 6pl 6rl, 6pl 5rl. Colouration very pale. Carapace, chelicerae and sternum light orange. Sternum a little lighter than the carapace. Abdomen and legs white. Other somatic characters. Body long and slim. Chelicerae dorsally covered with small tubercles. The distance between the AE equal to their diameter. Posterior eye-row very slightly procurved, almost straight. PE touching to each other. PLE touching to AE. Chelicerae with 3 teeth of approximately the same size, arranged in one row. The proximal one positioned near the base of the cheliceral groove, the medial one is close to it and the distal one is approximately at the middle of the groove (Fig. 5). Labium pyramidal, notched distally. Tarsi with 2 claws and claw tuffs. Anterior border of sternum wider than the labium. Palp. (Figs 7–11, 14–15). Cymbium length 0.45; Male copulatory bulb length 0.63. Tegulum oval, almost rounded from retrolateral view. Embolic division wide, bent in the middle, unevenly sclerotized, with massive process starting from its base. Embolus opens at the distal end (Figs. 10, 15). Crest positioned diagonally in the distal part of the embolic division (Fig. 15). Lateral sheet weakly sclerotized, almost transparent. Posterior apophysis short and bent perpendicularly to the embolic division, detached from the tegulum and surrounded by the distal haematodocha. Female. (Figs 3–4, 6, 12–13, 16–17). Measurements. Total length (including the chelicerae) 4.68; carapace length 1.80, width 1.26; sternum length 1.12, width 0.80; cheliceral length 0.72, width 0.35; clypeus height 0.05; labium length 0.41; gnathocoxa length 0.65; abdomen length 2.88, width 1.44; Eye diameters: AE—0.17, PE— 0.14. Leg measurements. I—5.41 (0.94, 1.25, 0.80, 1.04, 0.98, 0.40); II—4.92 (0.86, 1.12, 0.79, 0.90, 0.90, 0.35); III—3.34 (0.50, 0.76, 0.47, 0.54, 0.77, 0.30); IV—4.64 (0.76, 1.04, 0.58, 0.92, 1.04, 0.30). Leg spination as in male. Coloration very pale. Carapace, chelicerae and sternum light orange. Sternum a little lighter than the carapace. Abdomen and legs white. Anterior border of sternum as wide as the base of labium. Other somatic characters as in male (Figs. 3–4, 6). Vulva. (Figs 12–13, 16–17). Transversal bar width 0.38. Spermatheca small, with mushroom-like anterior part and deeply notched base. Dorsal arc of anterior diverticulum shaped as an irregular trapeze, wider than the spermatheca, weakly sclerotized, with almost transparent edges. Transversal bar comparatively straight. Posterior diverticulum wide, membranous. Distribution. Known only from the type locality in southwestern Turkmenistan. Discussion. The new species’ morphologically closest congener D. kronebergi was diagnosed as being close to the Dysdera gigas species-group (Dunin 1992a: 137), referring to Deeleman-Reinhold & Deeleman (1988). However, there is no D. gigas -group defined in the cited paper. Instead, D. gigas along with another three similar species are listed under the Dysdera asiatica -group (Deeleman-Reinhold & Deeleman 1988: 210). The authors explicitly mention that the lateral sheet is missing in these species whereas in D. zonsteini n. sp. it exists. All the species related to D. gigas are known from Greece and the Greek islands and their relationship with D. kronebergi suggested by Dunin is doubtful, since neither the genital morphology nor their distribution ranges support it. Some important morphological traits of the new species correspond well with the diagnose of the D. asiatica -group (sensu Deeleman-Reinhold & Deeleman 1988): 1. Chelicerae are shorter than half of the length of the carapace; 2. The embolic division is longer than the tegulum; 3. The presence of crest and lateral sheet on the embolic division of the male palp; 4. The arched spermatheca of the vulva. However, the diagnosis of the group itself (sensu Deeleman-Reinhold & Deeleman 1988) has one serious disadvantage: it is named after a species known only by male sex. Thus, all the other members of the group are linked to Dysdera asiatica based only on the males. Apart from that, as already stated by Deeleman-Reinhold & Deeleman (1988: 210), the group is very rich in species and in Central Asia is neither homogenous nor can be clearly separated from the D. aculeata -group. The group warrants a thorough new revision. Here, I provisionally place D. zonsteini n. sp. in D. asiatica species-group. Most of the other species, known from Turkmenistan belong to the D. aculeata -group according to the same classification. Although the data about the distribution of D. zonsteini n. sp. are insufficient to identify with certainty its zoogeographical status, its occurrence in the southern part of the country implies that it could be an Irano-Turanian species.Published as part of Dimitrov, Dragomir, 2021, Description of Dysdera zonsteini n. sp. (Arachnida: Araneae: Dysderidae) from Turkmenistan, pp. 588-594 in Zootaxa 4938 (5) on pages 589-593, DOI: 10.11646/zootaxa.4938.5.6, http://zenodo.org/record/457510
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