3,993 research outputs found
Detergency in Liquid CO2
No full textIn this dissertation we study Detergency in liquid Carbon Dioxide. Detergency is the cleaning performance of additives, surfactants in particular, in washing fluids. Liquid CO2 is under consideration, for environmental and toxicological reasons, to replace perchloro-ethylene as the solvent in textile dry cleaning technology. Inherent problems of such a transition were confronted with the methodology of chemical engineering design. The Basic Cycle of Design (BCD) approach was used as a pathway for designing a detergent. The BCD also establishes the structural framework of the thesis, which can, therefore, be read as records from a successful product engineering project, in which an effective detergent has been designed for a new dry cleaning solvent. The Dynamic Detergency Model (DDM), which succeeds to explain the role of surfactants in the washing operation, is used as a rational starting point for the design of a detergent in liquid CO2. According to this model, such a surfactant must be: sparingly soluble in the solvent, surface-active and able to form micelles in the solution. The different experiments carried out (solubility, interfacial-tension and dye solubilisation measurements), show that a number of molecules of the homologous polyoxyethylene/alkane series, generally described by the shorthand formula CiEj did indeed behave as surfactants and can be then considered detergents for liquid CO2. In the technical evaluation of the detergents, at laboratory as well as at semi-pilot scale, high washing performances were obtained. They are, indeed, as good for dry cleaning textiles as the present perchloro-ethylene (Perc) technology.Applied Science
'Her Irish Heritage' : Annie M.P Smithson and autobiography
No full textThis paper examines some aspects of the work of Annie M.P. Smithson, the author of 21 romance novels between 1917 and 1946. Her attitudes towards women, religion and politics are explored, and the importance of autobiography in her fiction discussed.Cet article analyse divers aspects de l'oeuvre d'Annie M.P. Smithson, l'auteur de vingt et un romans 'romanesques' publiés entre 1917 et 1946. Il étudie son attitude concernant les femmes, la religion, la politique, ainsi que le rôle de l'autobiographie dans sa fiction.Walsh Oonagh. 'Her Irish Heritage' : Annie M.P Smithson and autobiography. In: Études irlandaises, n°23-1, 1998. pp. 27-42
Initiation of the bony epiphysis in long bones: Chronology of interactions between the vascular system and the chondrocytes
No full textMany events occur concurrently during the initiation of the secondary ossification center in the cartilaginous epiphyses of long bones. We have investigated the chronology of interactions between the vascular system and epiphyseal chondrocytes by culturing explanted heads of femurs and humeri from pre- and neonatal rabbits on the chorioallantoic membrane (CAM) of growing chick embryos. We confirmed that, on the whole, the epiphyseal cartilage was resistant to vascular invasion, whereas the physeal growth plate was resorbed. However, new CAM-derived cartilage canals occasionally penetrated through the articular surface. This caused death of those chondrocytes in the immediate vicinity of the canal but no further reaction. If explants already contained a bony epiphysis and were halved prior to culture, CAM-derived vessels were attracted to the spongiosa. From there they pushed into the uncalcified cartilage, indicating that calcification was not a prerequisite for vascular invasion. Where at least two vessels were in apposition, a new pseudo-ossification center was initiated: chondrocytes became hypertrophic and the matrix calcified. This suggests that cumulative release of diffusible factors from more than one vessel was the trigger for chondrocyte hypertrophy, which, in turn, led to the initiation of the bony epiphysis. CAM cultures thus provide an experimental model for both the quiescent angiogenesis of cartilage canal formation and the reactionary angiogenesis associated with chondrocyte hypertrophy. By exploiting the different anatomy of CAM-derived vascularity, events that occur concurrently in vivo can be spacially separated in CAM culture.<br/
Il ruolo della linguistica in un'iniziativa di internazionalizzazione
No full textThe author deals with the role of linguistic sciences and language teaching in the internationalization project of an e-learning Specialization Course
The influence of steady blowing and roughness on transitional separated boundary layers
No full textThis paper presents the results of a study between two types of forcing, namely steady blowing and a tripwire, on the control of laminar separated boundary layers. The analysis focuses on the differences in the transition process between these two types of forcing. This effect will be studied using direct numerical simulation. The main differences consists in the coherent structures formed during transition and the overall kinetic energy growth
Gusmani grecista
No full textThe author deals with the Roberto Gusmani's works about Ancient Greek language
Skin-Friction Measurements on Mathematically Generated Roughness in a Turbulent Channel Flow
No full textEngineering systems are affected by surface roughness, however, predicting frictional drag has proven to be challenging. The present work takes a systematic approach by generating and manufacturing surfaces roughness where surface statistics, such as rms, skewness and power-spectral density can be controlled. The frictional drag on these surfaces is measured in a turbulent channel flow facility
Padronização do cultivo de amastigotas axênicos e intracelulares de Leishmania spp. e análise da atividade leishmanicida de chalconas
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Biológicas. Programa de Pós-Graduação em Biotecnologia
Orasema scaura Baker & Heraty 2020, n. sp.
No full textOrasema scaura n. sp. urn:lsid:zoobank.org:act: D2243AD5-BA0B-4A9C-B82D-4C7CCB2D3B89 (Fig. 9) Diagnosis. Distinguished from other members of the coloradensis group by having all tarsi with four segments, tarsomeres distinctly lobate with lobes broadly overlapping subsequent tarsomeres on the ventral side (Fig. 9E), and antennal flagellum length shorter than height of the head (Fig. 9B). This is the only eucharitid known to have 4-segmented tarsi. Description. Female. Length 3.0– 3.4 mm (Fig. 9A). Color. Head and mesosoma iridescent blue-green. Scape, pedicel, anellus, and flagellum brown. Coxae iridescent blue-green; femora mostly brown with iridescence, tips pale; tibiae yellow. Gaster same as mesosoma. Head (Fig. 9B). HW:HH = 1.2–1.3; face imbricate; eyes sparsely se-tose, IOD:EH = 1.4–1.6; MS:EH = 0.7–0.9; supraclypeal area slightly broader than long, weakly sculptured. Labrum with variably asymmetric digits with 4–9 setae (Fig. 9F). Occiput with dorsal margin rounded. Pedicel globose, not as broad as F1. FL:HH = 0.8–1.0; F2L:F2W = 1.1–1.4, F2L:F3L = 1.3–1.8 (Fig. 9D). Mesosoma (Fig. 9C, G). ML: MH = 1.3–1.6. Mesoscutal midlobe imbricate, densely setose; lateral lobe smooth. Axilla smooth, dorsally rounded, on roughly same plane as mesoscutellum; scutoscutellar sulcus narrow, regularly foveate, broadly separated from transscutal articulation; mesoscutellar disc smooth; frenal line irregularly foveate; frenum smooth; axillular sulcus distinct and foveate; axillula areolate-reticulate. Propodeal disc broadly rounded, with shallow medial depression, rugose-areolate (Fig. 9H); callus nearly smooth, densely setose. Propleuron imbricate. Prepectus weakly rugose. Mesepisternum reticulate laterally, smooth ventrally. Upper and lower mesepimeron smooth; transepimeral sulcus weakly impressed. Metepisternum laterally smooth. HCL:HCW = 1.4–2.0, with weak dorsolateral sculpture; HFL: HFW = 3.1–3.8. FWL:FWW = 2.2–2.5, FWL:ML = 1.8–2.1; submarginal vein with several long setae; postmarginal vein slightly longer than stigmal vein. Metasoma. Petiole cylindrical, linear in profile, PTL:PTW = 1.2–1.6, PTL: HCL = 0.7–0.9, areolate-reticulate, lateral margin rounded, ventral sulcus present. First (ventral) valvula with 6–8 small, narrowly separated teeth, second (dorsal) valvula with 6 or 7 annuli that are narrowly separated dorsally, the carinae coalescing. Male. Unknown. Hosts. Unknown. Plant associates. Swept from Ericameria nauseosa (Asteraceae) in Idaho. Distribution (Fig. 5). United States: AZ, CA, ID, NV. Collected June–August. Material examined. Holotype. UNITED STATES. Idaho: Butte Co., 6 mi S Howe, 43°42’0”N, 113°01’50”W, 28.vii-4.viii.1983, M.P. Stafford, host plant: Ericameria nauseosa [♀, deposited in WFBM: UCRCENT00407525]. Paratypes. UNITED STATES. Arizona: Cochise Co., Cave Ck. Cyn. Chiricahua Mts, 6 mi W Portal, 2042m, 31°55’0”N, 109°15’0”W, 11.vii.1981, H.A. Hespenheide [1♀, UCLA: UCRCENT00414825]. Coconino Co., Hwy 180 SE Valle, 1850m, 35°37’13”N, 112°05’45”W, 26.vii.2008, S. Triapitsyn [1♀, UCRC: UCRCENT00264701]. Amedee, 40 ° 16’12”N, 120 ° 09’36”W, 4.vii.1947, T.F. Leigh [1♀, EMEC: UCRCENT00236340]. California: Lassen Co., Hallelujah Junction, 1440m, 39°47’0”N, 120°04’0”W, 1-3.vii.1992, D. Carmean, 73 [1♀, UCDC: UCRCENT00416100]. Hallelujah Junction, 1440m, 39°47’0”N, 120°04’0”W, 29-30.vi.2006, M.F. Sherriffs, 060 [1♀, UCDC: UCRCENT00477664]. Idaho: Butte Co., 6 mi S Howe, 43 ° 42’0”N, 113 ° 01’50”W, 28.vii-4.viii.1983, M.P. Stafford, host plant: Ericameria nauseosa [45♀, WFBM: UCRCENT00403564–75, UCRCENT00403577– 78, UCRCENT00403581–82, UCRCENT00403585, UCRCENT00407501–02, UCRCENT00407504–12, UCRCENT00407514–20, UCRCENT00407522–24, UCRCENT00407526–28, UCRCENT00407531, UCRCENT00407533–34, UCRCENT00407537]. 6 mi. S Howe, 43 ° 41’24”N, 113 ° 01’48”W, 4.viii.1983, N.P Stafford [1♀, WFBM: UCRCENT00003619]; 22.vii.1982, J.B. Johnson, host plant: Ericameria nauseosa [5♀, WFBM: UCRCENT00403576, UCRCENT00403583, UCRCENT00403604, UCRCENT00407521, UCRCENT00407561] Canyon Co., 15 mi S Nampa, 43 ° 18’47”N, 116 ° 6’11”W, 21.vi.1977, J.M. Domek [1♀, WFBM: UCRCENT00403580]. Cassia Co., 9 mi E Malta, 42 ° 18’25”N, 113 ° 11’28”W, 14.vii.1981, R.P. Wight [1♀, WFBM: UCRCENT00403584]. Nez Perce Co., Hells Gate St. Pk., 293m, 46°21’24”N, 117°03’3”W, 14.vii.1983, J.B. Johnson, host plant: Ericameria nauseosa [3♀, WFBM: UCRCENT00407478, UCRCENT00407494–95]. Twin Falls Co., Rogerson, 42 ° 13’5”N, 114 ° 35’38”W, 20.vii.1961, R.E. Stecker, host plant: Chrysothamnus [1♀, WFBM: UCRCENT00403579]. Nevada: Carson City, 39 ° 09’49”N, 119 ° 46’3”W, 6.vii, Baker [6♀, USNM: UCRCENT00247968–70, UCRCENT00248316–18]. Nye Co., Mercury, 36 ° 39’39”N, 115 ° 59’40”W, 5.viii.1964 [2♀, USNM: UCRCENT00248383–84]. Washoe Co., S end of Pyramid Lake, 1140m, 39 ° 50’35”N, 119 ° 26’49”W, 8.vii.1982, D.E. Russell [2♀, UCDC: UCRCENT00404586, UCRCENT00404588]; L.D. French [2♀, UCDC: UCRCENT00404585, UCRCENT00404587]; P.Timper [2♀, UCDC:UCRCENT00404583, UCRCENT00416064]. Verdi, 39 ° 31’5”N, 119 ° 59’20”W, 12.vii.1974, B. Villegas [1♀, UCDC: UCRCENT00404584]. Etymology. Latin, meaning “swollen ankles,” which refers to the thick, lobate tarsomeres. Discussion. Because the comparatively large number of specimens collected for this species (75 examined) are all female, it seems likely that this species is parthenogenetic. Attempts to sequence Wolbachia from two pointmounted specimens collected in 1983 and 2008 were negative.Published as part of Baker, Austin J. & Heraty, John M., 2020, The New World ant parasitoid genus Orasema (Hymenoptera: Eucharitidae), pp. 1-84 in Zootaxa 4888 (1) on pages 18-20, DOI: 10.11646/zootaxa.4888.1.1, http://zenodo.org/record/429769
W.J. Baker, M.P.
No full textTitle from unverified data provided by the Bain News Service on the negatives or caption cards.Forms part of: George Grantham Bain Collection (Library of Congress).General information about the Bain Collection is available at http://hdl.loc.gov/loc.pnp/pp.ggbai
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