326,599 research outputs found
CALDER: Cryogenic light detectors for background-free searches
No full textCALDER is a R&D project for the development of cryogenic light detectors with an active surface of 5x5cm2 and an energy resolution of 20 eV RMS for visible and UV photons. These devices can enhance the sensitivity of next generation large mass bolometric detectors for rare event searches, providing an active background rejection method based on particle discrimination. A CALDER detector is composed by a large area Si absorber substrate with superconducting kinetic inductance detectors (KIDs) deposited on it. The substrate converts the incoming light into athermal phonons, that are then sensed by the KIDs. KID technology combine fabrication simplicity with natural attitude to frequency-domain multiplexing, making it an ideal candidate for a large scale bolometric experiments. We will give an overview of the CALDER project and show the performances obtained with prototype detectors both in terms of energy resolution and efficiency
Sertularella unituba Calder 1991
No full textSertularella unituba Calder, 1991a Fig. 9a, b Sertularella gayi unituba Calder, 1991a: 103, fig. 54. Type locality. Bermuda: 2 km southeast of Castle Roads (Calder 1991a). Voucher material. Off St. Lucie Inlet, 27°11.6’N, 80°00.7’W, 41 m, 18.v.1976, Johnson-Sea-Link, JSL 2048, two colony fragments, up to 2.3 cm high, without gonophores, coll. J. Reed, ROMIZ B1093.— Bethel Shoal off Vero Beach, 27°42.6’N, 80°06.8’W, 24 m, 18.ii.1976, Johnson-Sea-Link, JSL 328, diver lockout, five colonies and colony fragments, up to 4 cm high, two with gonothecae, coll. S. Nelson, ROMIZ B1099. Remarks. Originally described as Sertularella gayi unituba by Calder (1991a), the subspecific name was elevated to specific rank by Medel & Vervoort (1998). Their taxonomic judgment was followed by Vervoort (2006) and is accepted here. Its recognition as a species distinct from S. gayi Lamouroux, 1821 is supported by the molecular studies of Moura et al. (2011). Sertularella unituba has been regarded as likely conspecific with hydroids that Allman (1888) initially described under the name Sertularia exigua (not Sertularia exigua Allman, 1877; not Sertularella exigua Thompson, 1879), and on discovering the homonymy renamed in a plate caption as Sertularia laxa (not Sertularia laxa Lamarck, 1816) (see Medel & Vervoort 1998; Vervoort 2006). Inasmuch as both S. laxa and S. exigua are invalid junior primary homonyms, they do not threaten the name Sertularella unituba. As noted above in remarks on Sertularella conica Allman, 1877, questions remain over the identity of that species, and whether it and S. unituba may be conspecific. Reported distribution. Atlantic coast of Florida. First record. Western Atlantic. Bermuda (Calder 1991a) to the Dry Tortugas (Van Gemerdeen-Hoogeveen 1965, as Sertularella conica). Elsewhere. Eastern Atlantic (Allman 1888, as Sertularella exigua; Medel & Vervoort 1998; Vervoort 2006).Published as part of Calder, Dale R., 2013, Some shallow-water hydroids (Cnidaria: Hydrozoa) from the central east coast of Florida, USA, pp. 1-72 in Zootaxa 3648 (1) on page 30, DOI: 10.11646/zootaxa.3648.1.1, http://zenodo.org/record/526436
Hebellopsis communis Calder 1991
No full textHebellopsis communis Calder, 1991a Fig. 5c Hebellopsis communis Calder, 1991a: 42, Figs. 26 a, b. Type locality. Bermuda: 2 km off Castle Roads (Calder 1991a). Voucher material. Bethel Shoal off Vero Beach, 27°42.6’N, 80°06.8’W, 24 m, on Thyroscyphus marginatus, 18.ii.1976, Johnson-Sea-Link, JSL 328, diver lockout, one colony, without gonothecae, coll. S. Nelson, ROMIZ B1100. Remarks. Hebellopsis communis Calder, 1991a resembles H. scandens (Bale, 1888), but differs in having: (1) hydrothecae that are deeper (>500 µm vs. <500 µm) and deeply campanulate rather than cylindrical and often markedly curved, (2) hydrothecal pedicels that are spirally annulated and of varied length (up to 400 µm long) rather than smooth and short (up to 130 µm long), and (3) hydrothecal orifices with larger openings (diameter 256– 280 µm vs. 160–191 µm). Hydrothecae resemble those of Hebella furax Millard, 1957 but lack a rounded annular ring basally. Hebellopsis gigas (Pieper, 1884) is also similar, but it has longer pedicels and hydrothecae with a more pronounced distal flare. This species, usually epizoic on other hydroids (especially Thyroscyphus marginatus Allman, 1877), is known only from the warm western Atlantic (Calder 1991a, 2000; Castellanos Iglesias et al. 2011; Oliveira et al. submitted). Its gonophores have yet to be described. Reported distribution. Atlantic coast of Florida. First record. Western Atlantic. Bermuda (Calder 1991a) to Brazil (Oliveira et al. submitted).Published as part of Calder, Dale R., 2013, Some shallow-water hydroids (Cnidaria: Hydrozoa) from the central east coast of Florida, USA, pp. 1-72 in Zootaxa 3648 (1) on page 19, DOI: 10.11646/zootaxa.3648.1.1, http://zenodo.org/record/526436
Dedication of Louis S. Calder Field House
No full text8 p.The dedication program for the Louis S. Calder Field House on May 17, 1958
Babara Calder
No full textBarbara Calder, the daughter of O. Mentzer and Fontella S. Calder, poses for a photograph
Wallace Calder
No full textWallace S. Calder is pictured his senior year at Uintah High School. He is the son of Pontha and Rosella Calder. He married Doris May Alexander
Sertularella affinicostata Calder and Faucci 2021
No full textSertularella affinicostata Calder and Faucci, 2021 (Figure 6e, f) Sertularella affinicostata Calder and Faucci, 2021: 23, figs 7a–e, 8 Type locality Ecuador: Galápagos Islands, Isla Darwin (Calder and Faucci 2021). Material examined Chatham Bay, 5.56126, −87.04516, 1 colony, 2 mm high, without gonothecae, coll. I. Keith, #253534. –Chatham Bay, 5.56216, −87.04516, 9 colony fragments, to 6 mm high, without gonothecae, coll. I. Keith, #240612. –Wafer Bay, 5.5456, −87.06235, 9 colony fragments, to 2 mm high, without gonothecae, coll. G. Ashton, #240597. –Wafer Bay, 5.5456, −87.06235, 2 colonies, on two barnacles, to 2 mm high, without gonothecae, coll. G. Ashton, #240591. –Wafer Bay, 5.5456, −87.06235, 6 colony fragments, to 3 mm high, without gonothecae, coll. G. Ashton, #240592. –Wafer Bay, 5.54535, −87.06185, 4 colony fragments, to 2.5 mm high, without gonothecae, coll. G. Ashton, #240636. –Wafer Bay, 5.54535, −87.06185, 1 colony, on a barnacle, 4 mm high, without gonothecae, coll. G. Ashton, #240629. –Wafer Bay, 5.54535, −87.06185, 1 colony fragment, 4 mm high, without gonothecae, coll. G. Ashton, #240630. –Chatham Bay, 5.56126, −87.04516, 2 colony fragments, to 5 mm high, without gonothecae, coll. I. Keith, #307712. –Chatham Bay, 5.56126, −87.04516, 1 colony fragment, 3 mm high, without gonothecae, coll. I. Keith, #307711. –Chatham Bay, dock 004, no coordinates, 1 colony fragment, 2 mm high, without gonothecae, coll. G. Ashton, #266336. Remarks Sertularella affinicostata Calder and Faucci, 2021 was first reported, as S. costata Leloup, 1940, from the two northernmost and warmest of the Galápagos Islands, Wolf and Darwin (Calder et al. 2003). It was discovered a second time in a collection from French Frigate Shoals in the Northwestern Hawaiian Islands (Calder and Faucci 2021) and recognised therein as an undescribed species. Calder and Faucci (2021) also provide records of previously unreported material from Cousin Rock and Marchena Island in the Galápagos. The present record from Cocos Island constitutes the third record of this tiny but morphologically striking hydroid species. Hydroids of S. affinicostata are noteworthy in having a series of sharp-edged horizontal ridges that ring walls of its hydrothecae. Trophosomes of the species differ in part from those of S. costata, originally described from Sagami Bay, Japan, in having fewer (10–14) ridges instead of about 20 (Leloup 1940; Hirohito 1983, 1995). Hydrothecae also differ in being barrel-shaped rather than distinctly tapered distally, and a neck region lacking ridges below the rim is noticeably longer. The proximal end of the hydrocaulus is typically short rather than extending as a long, slender peduncle as in S. costata, and internodes of the hydrocaulus are shorter and thicker. The original account of S. affinicostata in Calder and Faucci (2021) was based on specimens from both the Galápagos Islands and the Northwestern Hawaiian Island. The holotype, from Darwin Island in the Galápagos archipelago, was selected as being the only fertile colony in the two collections. The species was well represented in our Cocos samples. It was present in 11 of the 42 samples (26%) of hydroids in the collection, although all of the specimens were sterile. Hydroids of S. affinicostata are minute, with colonies from Cocos Island ranging between 2 and 6 mm in height. Indeed, the holotype was merely 1.5 mm high. A substrate generalist, the species has been reported from barnacles, a sponge, calcareous rubble, algae and a hydroid stem (Calder and Faucci 2021). Specimens examined here were removed from fouling panels exposed at Chatham Bay and Wafer Bay. While S. affinicostata is certainly a species of shallow waters, its overall bathymetric range is not yet well known. Specimens from the Galápagos were collected at depths of 6 m off Wolf Island (Calder et al. 2003), and from 10 m off Cousin Rock and 8 m off Marchena Island (Calder and Faucci 2021). Collections from Cocos Island were on panels exposed at depths of 0.5– 3 m. A description and additional comments on S. affinicostata are provided by Calder and Faucci (2021). We treat S. affinicostata as cryptogenic in the Cocos, Galapagos and Hawaiian Islands. While potentially a member of a naturally transpacific fauna, its occurrence in shallow water, and particularly on biofouling panels in Cocos, do not exclude it from shipmediated transport. As we discuss below, an increasing number of invasions are recognised from open-ocean environments (such as in the Galapagos and the French Frigate Shoals), thus not excluding this species from being potentially introduced, even if its home port remains unknown at this time. Reported distribution Cocos Island: first record. Elsewhere: Galápagos Islands (Calder et al. 2003, as Sertularella costata); Northwestern Hawaiian Islands (Calder and Faucci 2021).Published as part of Calder, Dale R., Carlton, James T., Keith, Inti, Ashton, Gail V., Larson, Kristen, Ruiz, Gregory M., Herrera, Esteban & Golfin, Geiner, 2022, Biofouling hydroids (Cnidaria: Hydrozoa) from a Tropical Eastern Pacific island, with remarks on their biogeography, pp. 565-606 in Journal of Natural History 56 (9 - 12) on pages 588-590, DOI: 10.1080/00222933.2022.2068387, http://zenodo.org/record/701248
Doris May Alexander Calder
No full textDoris May Alexander Calder is the wife of Wallace S. Calder. She is the daughter of T.G. Alexander
Joan Calder
No full textJoan Calder is pictured her school year at Central Elementary. She is the daughter of Wallace S. and Doris Calder. She married John B. Dufurrena. She was born July 7, 1929 and died December 19, 2020
Jimmy Calder
No full textJames (Jimmy) A. Calder is pictured his school year at Central Elementary. He is the son of Wallace S. and Doris Calder. He married Beverly Jean Neal. He was born December 19, 1930 and died February 12, 2017
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