7,302 research outputs found
Campylothorax hexosetosus Soto-Adames, 2016, sp. nov.
No full textCampylothorax hexosetosus sp. nov. Figures 7 – 9 Etymology The epithet refers to presence of six Mc in the mesothoracic p3 complex. Material examined Holotype, slide-mounted, Dominican Republic, La Vega, Cordillera Central, Loma Casabito, 16 km NW, Bonao, 10°2'21.048''N, 70°31'5.016''W, 1487 m elevation, evergreen cloud forest, malaise trap, 28 May 2003, sample DR21182, J. Rawlins, C. Young, R. Davidson, C. Núñez, P. Acevedo; one paratype on slide, same information as holotype; two paratypes on slides and 13 adults and juveniles in alcohol as above but 19°2'22.976''N, 70°31'8.0034''W, 1455 m elevation, yellow pan trap, 28 May 2003, sample DR21262. Size. Up to 3.1 mm. Colour pattern. Background brownish, purple pigment limited to antennae, legs, gena, antero-lateral margin of meso- and metathorax and, in some individuals, lateral margin of Abd. 2. (Figure 7). Head. Antennae broken beyond second antennal segment. Head with eight Mc along antennal margin and four other Mc along inner margin of eye patch; head dorsally with eight anterior (A0, A2, A3, A5, S2, S3, S4, S5) and one posterior (Pa5) Mc, Ps5 enlarged but clearly smaller than normal Mc (Figure 8 A). Pre-labral chaetae smooth. Chaetae on sublobal plate of maxillary palp not seen. Maxilla with four lamellae: lamella 1 apically truncate, with many strong, hooked papillae (Figure 8 B); lamella 2 apically square, with papilla arranged into largely organised rows (Figure 8 C). Lateral appendage of labial papilla E not reaching tip of papilla (Figure 8 E). Labial and post-labial chaetae as in C. notidanus sp. nov. Body. Body Mc as 64/0241+7+0+5. Th. 2 dorsally flat, Th. 3 rounded (Figure 8 D), extending posteriorly to cover medial section of Abd. 1, including pseudopore. Th. 2 with six Mc in p3 complex (Figure 8 D); Th. 3 with four Mc in p2 – 3 complex. Lateral chaetae of Abd. 3 comprising one microchaeta and five macro- or mesochaetae as in Figure 8 F. Inner chaetotaxy of Abd. 4 (Figure 9 A) as in C. notidanus sp. nov., with one unpaired (M) and seven paired Mc (A1, A3, A5, A6, B3, B4, B5), spatial distribution of inner posterior Mc variable (Figure 9 B, C); laterally with five Mc (E2, E3, F1, F2, F3), Mc E4 absent (Figure 9 A). Posterior chaetae 15 – 20. Legs. Trochanteral organ with up to 47 chaetae. Pro- and metathoracic claw complexes as in C. notidanus sp. nov. Furcula. Mucro typical for genus, 1.0 – 1.5 as long as inner edge of hind claw. Remarks Campylothorax hexosetosus sp. nov. is the only member of the genus with six mesothoracic Mc in the p3 complex, Abd. 4 with Mc A3 anterior to the pseudopore, and lateral Mc E4 absent. The new species shares with C. notidanus sp. nov. the number of inner Mc on Abd. 4, but differs form that species in many other characters as listed in the remarks to C. notidanus sp. nov. and in Table 2.Published as part of Felipe N. Soto-Adames, 2016, Chaetotaxy of first-instar Campylothorax sabanus (Wray), and description of three new Campylothorax species from Hispaniola (Collembola, Paronellidae), pp. 1583-1612 in Journal of Natural History 50 (25) on pages 1598-1602, DOI: 10.1080/00222933.2016.1145272, http://zenodo.org/record/26988
Campylothorax notidanus Soto-Adames, 2016, sp. nov.
No full textCampylothorax notidanus sp. nov. Figures 4 – 6 Etymology The epithet refers to the greatly enlarged, conic metanotum. Material examined Holotype, on slide, Dominican Republic, La Vega, Cordillera Central, Loma Casabito, 15.8 km NW, Bonao, 19°2'11.976''N, 70°31'8.0034''W, 1455 m elevation, evergreen cloud forest, yellow pan trap, 28 May 2003, sample DR21262, J. Rawlins, C. Young, R. Davidson, C. Núñez, P. Acevedo; four paratypes on slides and 32 adults, subadults and juveniles in alcohol, same collection information as holotype; one paratype in alcohol, La Vega, Cordillera Central, 4.1 km SW El Convento, 19°2'15.5394''N, 70°42'48.024''W, 1730 m elevation, dense secondary evergreen forest, yellow pan trap, 31 May 2003, sample DR22262, J. Rawlins, R. Davidson, C. Young, C. Núñez and P. Acevedo. Size. Up to 4.0 mm. Colour pattern. Antennae white or lightly pigmented with purple (Figure 4 A); head light purple, Th. 2, anterio-lateral margins of Th. 3, coxae and trochanters dark purple; legs white distal to trochanter; Abd. 3 with separated medial and lateral spots or bands; Abd. 4 anteriorly with 1 – 3 paired narrow longitudinal stripes (Figure 4 A, C), sometimes reaching latero-medial patches; Abd. 4 triangular latero-medial patches (Figure 4 B, C) sometimes extending medio-posteriorly to join narrow band along posterior margin of segment (Figure 4 A); collophore and furcula white. Head. Antennae broken beyond second antennal segment. Eyes 8 (Figure 5 A), eyes G and H reduced; eye valley with five ciliate chaetae. Head with up to 11 Mc along antennal margin and four other Mc along inner margin of eye patch. Head dorsally (Figure 5 A) with seven anterior (A0, A2, A3, A5, S3, S4, S5) and one posterior (Pa5) Mc. Pre-labral chaetae finely denticulate, appearing smooth at low magnification. Labral chaetae 5, 5, 4, all smooth; chaeta length heterogeneous (Figure 5 D): proximal row (P) with middle chaeta (P0) longest and P1 shortest; medial row (M) with second chaeta (M1) longest and M2 shortest; distal row (D) with inner chaeta (D1) longer than outer chaeta (D2). Peristomal chaetae ciliate, bothriotricha-like. Proximal pleural chaeta (pps) denticulate, appearing smooth at low magnification, distal chaeta (dps) reduced, short and smooth (Figure 5 D). Basal chaeta of maxillary palp ostensibly shorter than distal chaeta (Figure 5 E); sublobal plate with two short chaetae. Maxillary head with three teeth and four lamellae; lamella 1 apically acuminate, with a subapical rounded expansion and short, straight papillae (Figure 5 B, C), lamella 2 apically rounded, densely packed with micropapillae (Figure 5 B). Lateral appendage of labial papilla E not quite reaching tip of papilla (Figure 5 F). Labial palp with five smooth proximal chaeta. Labial triangle with M1M2rEL1l2A1 – 5 (Figure 5 G); r smooth 3/4 as long as E; l2 short, spine-like. All post-labial chaetae coarsely ciliate; with six chaetae along cephalic groove. 1Species not included due to inadequate descriptions: C. camelinus Womersley, 1930 and C. shae ff eri Börner, 1906. 2 1 + 1 means there are two columns, each with one seta; 2 + 2 means there are two columns each with two setae; 2 means there is only one column along the eye margin with two setae. Body. Body Mc 23/0241+7+0+5. Th. 2-Abd. 3 tergal S-chaetae as 11/011?3, S-microchaetae as 10/10100. Th. 2 dorsally flat; Th. 3 greatly developed (Figures 4 A, B and 5H), conic, extending posteriorly to cover medial section of Abd. 1 to intersegmental membrane with Abd. 2. Th. 2 with one S-chaeta and one S-microchaeta on lateroanterior corner, and two Mc in p3 complex (Figure 5 H); Th. 3 with one latero-anterior S-chaeta and three Mc in p2-3 complex. Abd. 1 with one anterior S-microchaeta; chaeta a6 absent. Abd. 2 (Figure 5 I) with two bothriotricha (m2, a5), two Mc (m3, m5), and S-chaeta as; number and distribution of lateral microchaetae unclear. Abd. 3 (Figure 6 A) with three bothriotricha (m2, a5, m5), four Mc (m3, am6, pm6, p6), S-chaeta as, S-microchaeta d2 inserted posterior to Mc p6, and five lateral mesochaetae. Abd. 4 (Figure 6 C) with four bothriotricha (B6, T2, T4, an secondary bothriotrix F3p?/F3 near latero-posterior margin); S-chaetae as and ps present, additional S-chaetae present but specimen condition does not allow us to ascertain their number. Pseudopore on Abd. 4 inserted in field just posterior to T4; tergum with eight inner Mc, one medial unpaired and seven paired (Figure 6 C): anterior triangle formed by paired A1 and one medial unpaired Mc; Mc A3 anterior and internal to pseudopore; Mc A5 and A6 near posterior margin of segment; Mc B3, B4 and B5 forming a group; lateral Mc E2, E3, E4, F1 and F3 present, E1 a microchaeta, E4 inserted anterior to D2, F2 absent. Posterior chaetae 23 – 34. Chaetotaxy of Abd. 5 as in C. sabanus (Figure 3 E). Legs. Trochanteral organ with up to 54 chaetae. Th. 3 claw complex as in Figure 6 B: tenent hair spatulate, relatively long, surpassing level of inner paired ungual teeth; claws with three inner teeth; basal teeth short, subequal, inserted on basal half of inner edge; unpaired tooth shorter than basal teeth, inserted on distal half of inner edge. Outer teeth ending on basal quarter of unguis (Figure 6 D); lateral teeth short but conspicuous; dorsal tooth short, clearly visible only on dorsal perspective. Unguiculus shorter on fore and middle legs than on hind legs, usually truncate, sometimes lanceolate, with a small inner tooth; posterior lamella smooth. Furcula. Dens with one inner and one outer row of spines. Mucro with five teeth, typical for genus, but unusually short, 0.6 – 0.8 as long as inner edge of hind claw (Figure 6 E). Remarks Campylothorax notidanus sp. nov. is the only member of the genus with a greatly enlarged, dorsal fin-shaped metathorax. The species is also unusual in having a greatly reduced dorsal chaetotaxy, with only three dorsal head Mc in row S, two Mc on Th. 2 p3 complex, three Mc on Th. 3 p2 – 3 complex and lacking Abd. 4 lateral Mc F2. The new species shares with C. hexosetosa sp. nov. the number and arrangement of inner Mc on Abd. 4, and the number and arrangement of lateral mesochaetae on Abd. 3, but otherwise it is quite different from all known Campylothorax (Table 2). The identity of thoracic Mc is unclear. The two Mc on Th. 2 are probably homologous with p2 and p3, whereas those on Th. 3 may be a2, p2 and a4. Unfortunately, all of the specimens studied are opaque and the microchaetae that could provide points of reference on the identity of the Mc are invisible.Published as part of Felipe N. Soto-Adames, 2016, Chaetotaxy of first-instar Campylothorax sabanus (Wray), and description of three new Campylothorax species from Hispaniola (Collembola, Paronellidae), pp. 1583-1612 in Journal of Natural History 50 (25) on pages 1593-1598, DOI: 10.1080/00222933.2016.1145272, http://zenodo.org/record/26988
Campylothorax dominicanus Soto-Adames, 2016, sp. nov.
No full textCampylothorax dominicanus sp. nov. Figures 10 – 11 Etymology The epithet refers to the apparent widespread distribution of the species in the northeastern section of the Dominican Republic. Material examined Holotype, slide-mounted, Dominican Republic, La Vega, Cordillera Central, Loma Casabito, 15.8 km NW, Bonao, 19°2'11.976''N, 70°31'8.0034''W, 1455 m elevation, evergreen cloud forest, yellow pan trap, 28 May 2003, sample DR21262, J. Rawlins, C. Young, R. Davidson, C. Núñez, P. Acevedo; one paratype in preparation and one juvenile in alcohol same collection data as holotype; two indviduals in alcohol, Duarte, Reserva Loma Quita Espuela, Canelo, 13.2 km NNE San Francisco de Macoris, 19°24'46.044''N, 70°9'52.02''W, edge of broadleaf forest, yellow pan trap, 6 April 2006, sample DR11263, C. Young, R. Davidson, J. Rawlins; two individuals in alcohol, poor condition, Cordillera Central, Reserva Valle Nuevo, La Nevera, 15.1 km SE Valle Nuevo, 18°41'47.04''N, 70°35'30.0114''W, 2252 m elevation, montane meadow in cloud pine forest, yellow pan trap, 3 June 2003, sample DR24462, R. Davidson, C. Young, C. Núñez, J. Rawlins, P. Acevedo, M. de la Cruz. Size. Up to 2.2 mm. Colour pattern. Background colour white (Figure 10 A); dark purple pigment evenly distributed on basal two-thirds of antennae, head, body, legs and manubrium; most intense on posterior three-quarters of Abd. 4; anterior margin of Abd. 4 with short, irregular, white or light blue longitudinal stripes (Figure 10 B). Head. Dorsal head chaetotaxy as in C. sabanus (Figure 1 B) with eight Mc along antennal margin and four other Mc along inner eye patch margin; with one unpaired (A0) and seven paired anterior (A2, A3, A5, S2, S3, S4, S5), and one posterior (Pa5) Mc. Pre-labral chaetae smooth. Maxilla lamella 1 and 2 as in C. notidanus sp. nov. Lateral appendage of labial papilla E long, reaching tip of papilla. Number of chaeta along cephalic groove unclear, apparently six. Body. Body Mc as 74/0241+7+0+5. Th. 2 dorsally flat; Th. 3 rounded, relatively short, partially covering central section of Abd. 1. Th. 2 with seven Mc in p3 complex; Th. 3 with four Mc in p2 – 3 complex. Abd. 3 with 3 + 2 lateral mesochaetae as in C. notidanus sp. nov. Inner section of Abd. 4 with anterior triangle formed by paired A1 and medial unpaired Mc; inner posterior Mc 6 + 6 organised as in Figure 11 A; Mc A3 inserted posterior to pseudopore. Lateral section of Abd. 4 with five large Mc (E2, E3, E4, F1, F2) and three other, smaller latero-posterior Mc; E4 inserted anterior to D2; F3 absent; posterior chaetae 16 + 16. Legs. Trochanteral organ with up to 26 chaetae. All tenent hairs spatulate, relatively short, reaching down to level of paired inner ungual teeth (Figure 11 B). All claws with two inner teeth and two outer teeth: inner teeth subequal, inserted on basal half of all legs; lateral teeth short, often obscured, inserted on basal quarter of outer edge; dorsal tooth absent. Unguiculus of all legs truncate, with one inner tooth; unguiculus on fore and middle legs shorter than on hind legs. Furcula. Mucro typical for genus, 2.3 – 2.4 times as long as inner edge of hind claw. Remarks Campylothorax dominicanus sp. nov. is the only member of the genus with the combination of an evenly pigmented purple body and Abd. 4 with short anterior white stripes, Abd. 4 lateral Mc F3 absent, unguis with two inner teeth and tenent hair reaching only to the level of inner ungual teeth. Dark specimens of C. sabanus, C. cubanus Gruia, 1983 and C. mitrai are similar to C. dominicanus sp. nov., but the absence of Mc F2 and presence of only two inner ungual teeth distinguishes the new species. The pattern of white stripes on Abd. 4 is similar to that of C. longicornis Schött, 1893 but the Cameroonian species has antero-medial multiplets (brow) on Abd. 4. This seems to be the most common species on the northeastern section of the Dominican Republic, and the only one found at low elevations.Published as part of Felipe N. Soto-Adames, 2016, Chaetotaxy of first-instar Campylothorax sabanus (Wray), and description of three new Campylothorax species from Hispaniola (Collembola, Paronellidae), pp. 1583-1612 in Journal of Natural History 50 (25) on pages 1602-1605, DOI: 10.1080/00222933.2016.1145272, http://zenodo.org/record/26988
Comparison of germline mosaics of genes in the polycomb group of Drosophila-melanogaster.
No full textPlutomurus jordanai Barjadze & Giordano & Soto-Adames 2020, sp. nov.
No full text<i>Plutomurus jordanai</i> Barjadze & Soto-Adames sp. nov. <p> <b>(</b> Figs 4–19)</p> <p> <b>Type locality.</b> GEORGIA, Imereti region, Tskaltubo district, near Zeda Kvilishori village, Sataplia-Tskaltubo karst massif, Zeda Kvilishori Cave, 4221’39.49”N, 4237’54.91”E, 249 m alt.</p> <p> <b>Type material.</b> Holotype,male on slide:twilight zone, 23.vii.2017, leg.G.Nebieridze(code GEOZQV20170723- 01). Paratypes (same data as holotype): three males on slides, leg. G. Nebieridze (code GEOZQV20170723-02, 03 and 04). One specimen mounted on SEM stub, leg. G. Nebieridze (GEOZQV20170723-05).</p> <p> <b>Repository.</b> Holotype GEOZQV20170723-01 and paratype GEOZQV20170723-02 are deposited at FSCA and paratypes GEOZQV20170723-03, 04 and 05 are deposited at ISIZU.</p> <p> <b>Description.</b> Body length up to 3.00 mm, excluding antennae and furcula.</p> <p>Colour. Body grey, habitus as in Fig. 4.</p> <p>Scale Distribution. Scales are present dorsally on Ant. I–II, head, body, all leg segments, both faces of collophore and ventral face of furcula. Postlabial region of head with few or no scales.</p> <p> Head. Ratio body length to antennae length up to 1.05. Eye number difficult to ascertain under compound microscope, apparently varying from 1 to 5, cornea poorly differentiated, vestigial (Fig. 7). Head dorsally with 1 unpaired (A 0), and 6 paired Mc: 2 anterior (A 2, A 3), 2 interocular (S 1, S 4) and 2 postocular (Pa 3, Pa 5) distributed as in Fig. 7. Posterior margin of head with a row of evenly size mesochaetae. Prelabral and labral chaetae smooth (Fig. 5): prelabral chaetae 6 (3+3); labrum with 554 papillate chaetae as typical for genus; distal margin of labrum with 4 elongate, thin-walled, flexible papillae (Fig. 5). Sclerotized head of maxilla with 2 large and 2 or 3 small teeth; maxillary lamellas as in <i>Plutomurus shurubumuensis</i> Barjadze, Jordana & Soto-Adames in Barjadze <i>et al.</i> 2018. Outer maxillary lobe trifurcate, basal chaetae shorter than apical process; sublobal plate with 4 chaeta-like processes, one chaeta-like process is distinctly reduced and shorter than others (arrow in Fig. 19).</p> <p>Body. Dorsal bothriotrichal formula 2,1/0,0,1,2,0 (Figs 8–10). Dorsal Mc formula 5,1/3,3,4,2,3 (Figs 8–10). Thorax macrochaetotaxy as in Fig. 8: Th. II with 3 anterior and 2 posterior Mc; Th. III with 1 posterior Mc. Abdominal macrochaetotaxy as in Figs 9 and 10: Abd. I–II each with 3 posterior Mc; Abd. III with 2 anterior and 2 posterior Mc as typical for genus; Abd. IV with 9 or 10 differentiated elements along posterior margin (labelled as 1–9 in Fig. 9), element 9 always a large Mc, element 6 developed into a small Mc, all other elements always have small mesochaeta-like sockets; Abd. V with 3 posterior Mc, 1 additional lateral Mc always present, but often hidden by slide mounting induced deformation of cuticle, and segment may appear as having only 3 Mc (Fig. 10).</p> <p>Legs. Hind legs (Fig. 11) with well-developed trochanteral (30 chaetae) and femoral (24 chaetae) organs (holotype); posterior face of tibiotarsus with 1 outstanding inner, basal spine-like chaeta, (arrow in Fig. 17) resulting in a 001 tibiotarsal spine formula. Tenent hair acuminated (Fig. 16). Ratio hind unguis: unguiculus: tenent hair as 1.95–2.73: 1.55–2.10: 1 (n=3). Inner edge of unguis on all legs with one characteristically minute proximal unpaired tooth (a in Fig. 16), and 1–3 larger distal unpaired teeth (b–d in Fig. 16). Unguis III with lateral teeth 0.25–0.61 as long as length of inner edge (n=4). Unguiculus lanceolate, tapered, with 2 internal lamellae bearing 0–4 teeth (Figs 6 and 16).</p> <p>Collophore. Anterior, posterior and lateral faces with 19, about 50 and 47 smooth chaetae respectively (Fig. 14).</p> <p>Tenaculum. Corpus with one smooth chaeta; rami with 4 + 4 teeth (Fig. 12).</p> <p> Furcula. Ratio manubrium: dens: mucro as 4.03–4.61: 7.84–9.56: 1 (n=3 including holotype). Outer margin of basal segment of dens with 2–4 apically acuminate macrochaetae, distal macrochaeta largest, proximal shortest. Inner edge of dens basally with well differentiated spine-like chaetae (Fig. 18); spines on basal segment of dens forming 2–3 short and poorly organized rows, upper row usually formed by 2 large, well-differentiated spines; spines on distal segment of dens forming a single row extending between 0.34–0.37 of length of distal segment of dens; spines on proximal portion of distal segment of dens always small, terminal spine always largest in row; long spines intercalated between short spines. Total dental spines number (Fig. 18) as 6–10 <i>II–III</i> / 9–13 <i>III–VI</i> (Arabic numbers represent small spines; Roman numerals in bold Italics represent large spines, on proximal/distal segments of dens). Dental spines have minute spinules on basal third (Fig. 15). Mucro with 2 basal and 2 distal teeth (202 formula) (Fig. 13).</p> <p> <b>Variation.</b> The vestigial condition of most eyes makes it difficult to determine the number of corneas on slide mounted specimens. The number of teeth on the inner lamellae of the unguiculus varies from 0 to 4 and the number of teeth on the unguis varies between 2 to 4.</p> <p> <b>Discussion.</b> The new species is the only member of <i>Plutomurus</i> with 3+3 prelabral chaetae, acuminate tenent hair, 001 tibiotarsal spine-like chaeta, an evidently reduced process on the sublobal plate of the outer maxillary lobe and five dorsal macrochaetae on Th II. Only two other species (<i>Plutomurus kelasuricus</i> Martynova, 1969, and <i>P. eristoi</i> Barjadze, Baquero, Soto-Adames, Giordano & Jordana, 2016) share with the new species the acuminate tenent hair, 3+3 prelabral chaetae and tibiotarsi with 001 outstanding spine-like chaeta. From <i>P. kelasuricus</i> the new species differs in having minute empodial teeth (large in <i>P. kelasuricus</i>), and in having one chaeta-like process on the sublobal plate of the outer maxillary lobe much reduced (arrow in Fig. 19) (normally developed in <i>P. kelasuricus</i> from type locality‒ ‒Kelasuri Cave (Tsebelda karst massif, Gulripshi Municipality, Abkhazia, Georgia) (Fig. 20). In addition to the fact that they occupy different, isolated cave massifs, the new species is found in the Sataplia-Tskaltubo karst massif, whereas <i>P. kelasuricus</i> inhabits the Tsebelda karst massif, located nearly 140 km away.</p> <p> The new species differs from <i>P. eristoi</i> by the presence of five Mc on Th. II, while <i>P. eristoi</i> lacks Mc on Th. II; and by the presence of two posterior Mc on Abd. IV, whereas <i>P. eristoi</i> carries only 1 posterior Mc.</p> <p> <b>Etymology.</b> The species is named after Prof. Rafael Jordana (University of Navarra, Spain), in recognition of his contributions disentangling the Gordian Knot of species level taxonomy in <i>Plutomurus,</i> and in gratitude for his work on the springtail fauna of Georgia.</p> <p> <b>Ecology.</b> The body and eye patch pigmentation, together with the thick, toothed unguis suggest that this is a troglophilous species.</p>Published as part of <i>Barjadze, Shalva, Giordano, Rosanna & Soto-Adames, Felipe, 2020, Description of a new species of Plutomurus Yosii (Collembola: Tomoceridae) from Georgia, Caucasus and notes on the morphology of Plutomurus birsteini Djanashvili & Barjadze, pp. 375-386 in Zootaxa 4790 (2)</i> on pages 377-383, DOI: 10.11646/zootaxa.4790.2.11, <a href="http://zenodo.org/record/3889434">http://zenodo.org/record/3889434</a>
Interactively using Semantic Web knowledge: Creating scalable abstractions with FacetOntology
No full textThe amount of knowledge accessible on the Semantic Web is growing, and there is a need for a scalable solution to facilitate exploring that data. Currently approaches to exploring Semantic Web data either focus on exploring resources individually, following links during exploration, and making little use of collated data, or take the approach of collating and aligning multiple sources into one store for one purpose, and hand-crafting a specific browsing interface onto it. We present an approach that provides a scalable browsing interface, which can browse knowledge from the Semantic Web at will. Our approach creates abstractions of knowledge, collated into facets, which are described using FacetOntology. FacetOntology facilitates describing facets from RDF data, suitable for use in creating datasets for faceted browsing
Growth Morphologies and Mechanisms of Non-Equilibrium Solidified MC Carbide
No full textGrowth morphologies and mechanisms of the carbide of group IVB and VB elements (MC carbide), a typical faceted crystal, were studied with an estimated cooling rate from 102 to 105 K/s. Results showed that although the growth morphologies of the MC carbide vary remarkably with solidification cooling rate, the solid/liquid interface is always atomically smooth, and the growth mechanisms are always lateral growth. The growth mechanism transition from lateral to continuous growth mode, which was predicted by the classic crystal growth theory, was not observed for the TiC type MC carbide within the estimated cooling rate range of 102?105 K/s
Ruth Klüger: la creatività per non “smarrirsi strada facendo”
No full textR. Klüger, a jewish viennese, a US citizen and a germanist, is the Author of two autobiographies “weiter leben”and “unterwegs versore”. Written in a style which alternates between essay and poetry, account and recollection, they are the occasion for the Author to establish a dialogue with the women having as a focus the exchange of experiences and reflections over the status of the feminine emancipation
Eutectic MC Carbide Growth Morphologies of a Laser Clad TiC/FeAl Composite Coating
No full textIn this paper, eutectic MC carbide growth morphology and its evolution with laser scanning speed were studied comprehensively of a laser clad MC carbide reinforced FeAl intermetallic matrix composite coating. As the laser scanning speed increased, the growth morphology of eutectic MC carbide was found to be needle-aligned annulation, butterfly-like and well-developed dendrite
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