4,457 research outputs found
El uso del cobre arsenical en las culturas prehispánicas del norte del Perú
No full textLa aleación binaria cobre arsenical fue muy utilizada por varias culturas de la costa norte del Perú, Ecuador y México desde el período del Horizonte Medio hasta la llegada de los españoles. Algunos investigadores como Lechtman ( 1976, 1981 ) y Shimada (Shimada, Epstein y Craig, 1982; 1983; Shimada y Merkel, 1991, Shimada 1994) se han interesado en su estudio. Innumerables piezas de cobre arsenical como naipes o hachas moneda e instrumentos para agricultura, entre otras cosas, han sido hallados en grandes cantidades en tumbas excavadas por arqueólogos y en excavaciones clandestinas
Cinética de adaptación tisular y cambios metabólicos en cabras subalimentadas /
No full text\ua0tesis que para obtener el grado de Doctorado en Ciencias de la Producción de la Salud Animal, presenta Manuel Gomez Pasten ; asesor Armando Shimada Miyasaka97 páginasDoctorado en Ciencias de la Producción de la Salud Animal\ua0UNAM, Facultad de Estudios Superiores Cuautitlan,\ua0201
Phanodermopsis dordi Shimada & Takeda & Tsune & Murakami 2020, sp. nov.
No full textPhanodermopsis dordi Shimada, sp. nov. Figures 1–2, Table 4. Type material. Holotype. Adult male (NSMT-As 4617), formalin-fixed, permanent whole mount, broken in posterior body region and connected with vas deferens (see Figures 1, 2). Type locality. CCFZ (10° 25.9376′ N, 147° 50.0029′ W, 5321 m depth) with a spade corer by the third author on 1 Oct. 2016. Diagnosis. Phanodermopsis dordi sp. nov. is characterized by the papilliform outer labial and cephalic sensilla, the absence of the sub-cephalic sensilla, the anterior position of the pore of secretory-excretory system (1.4 cephalic diameters from anterior body end), the long, conical tail (2.3 cloacal body diameters) with an acute tip, the long spicules (1.9 cloacal body diameters), and the absence of the gubernaculum. Etymology. The specific name dordi is a noun in the genitive case after DORD. Description. Male. Body almost cylindrical, tapering toward both ends. Cuticle finely striated, 2–5 μm thick. Somatic sensilla absent. Gland cells surrounding intestine (cf. Shimada & Kakui 2019) absent. Head rounded and slightly set off by constriction at 0.6 cephalic diameters from anterior body end, diameter at level of cephalic sensilla bases equal to 0.2 maximum body diameters. Cephalic cuticle 1–2 μm thick. Type II pharyngo-cephalic complex (cf. Zograf et al. 2015) present: pharyngeal capsule with three short outgrowths at anterior end; cephalic capsule weakly developed (ca. 1 μm thick and 6 μm long). Six inner labial sensilla papilliform. Six outer labial and four cephalic sensilla also papilliform, arranged in separate circles (the former just anterior to the latter), situated at 0.4 cephalic diameters from anterior end. Sub-cephalic or cervical sensilla absent. Amphids situated at 0.75 cephalic diameters from anterior end, 0.3 corresponding body diameters wide, with transverse slit-like aperture and pocket-like fovea. Buccal cavity conical, without solid teeth. Pharynx enlarged posteriorly. Pore of secretory-excretory system located at 1.4 cephalic diameters or 0.05 pharyngeal lengths from anterior end. Gland cell of secretory-excretory system not observed. Nerve ring at 0.45 pharyngeal lengths from anterior end. Cardia short, 1/3 of corresponding body diameters long. Intestine almost cylindrical, broken in posterior body region. Tail conical, 2.3 cloacal body diameters long. Cloacal or caudal sensilla not observed. Tail tip acute, with spinneret and no terminal setae. Caudal glands precloacal, but probably lost due to injury of posterior body region. Reproductive system diorchic. Testes opposed and outstretched, both located on left side of intestine: anterior testis longer, situated from 53% to 70% of body length; posterior testis situated from 68% to 74% of body length. Sperms globular or spheroid in shape, 3–10 μm in diameter. Vas deferens conspicuous. Spicules equal in size and shape, 1.9 cloacal body diameters long or 0.8 tail lengths, strongly arcuate, without proximal head, distally not acute. Gubernaculum not observed. Precloacal supplement or sensilla absent. Female. Not found. Remarks. A male was identified as a member of the genus Phanodermopsis based on the presence of the type II pharyngo-cephalic complex, the short spicule (less than 2.0 cloacal body diameters), and the absence of the precloacal supplement. Phanodermopsis contains only four valid species: P. groenlandica Ditlevsen, 1926, P. ingrami Mawson, 1958, P. kohtsukai Shimada & Kakui, 2019, and P. nana Zograf et al., 2015 (Zograf et al. 2015; Shimada & Kakui 2019). Phanodermopsis dordi sp. nov. differs from all the congeners by the papilliform outer labial and cephalic sensilla (vs. setiform, 0.5–1.0 cephalic body diameters long in the congeners); and the position of the pore of secretoryexcretory system (1.4 cephalic diameters from anterior body end in P. dordi sp. nov. vs. 2.8–4.6 in the congeners). Phanodermopsis dordi sp. nov. is also distinguished from P. groenlandica, P. ingrami, and P. nana by the conical tail (vs. conico-cylindrical with the short posterior portion in the latter three species) and from P. kohtsukai by the longer (2.3 cloacal body diameters) tail with acute tip (vs. 1.3 cloacal body diameters long with blunt tip in P. kohtsukai). In addition, P. dordi sp. nov. differs from P. ingrami by the longer spicules (1.9 cloacal body diameters in P. dordi sp. nov. vs. shorter than 1.0 cloacal body diameters in P. ingrami), from P. nana by the absence of the gubernaculum (vs. present in P. nana), and from P. kohtsukai by the absence of the sub-cephalic sensilla (vs. four sub-cephalic setae present in P. kohtsukai). The taxonomic key for the species of Phanodermopsis is as follows: 1 Outer labial and cephalic sensilla papilliform................................................... P. dordi sp. nov. - Outer labial and cephalic sensilla setiform.................................................................. 2 2 Cephalic setae equal to cephalic diameter............................................................. P. nana - Cephalic setae equal to or shorter than a half of cephalic diameter............................................... 3 3 Tail conical................................................................................. P. kohtsukai - Tail conico-cylindrical................................................................................. 4 4 Tail ca. 2.5 cloacal or anal body diameters in males, 2.0 in females....................................... P. ingrami - Tail shorter than 1.5 anal body diameters........................................................ P. groenlandicaPublished as part of Shimada, Daisuke, Takeda, Naoya, Tsune, Akira & Murakami, Chisato, 2020, Three new species of free-living marine nematodes (Nematoda: Enoplida) from the Clarion-Clipperton Fracture Zone (CCFZ), North Pacific, pp. 507-526 in Zootaxa 4859 (4) on pages 510-513, DOI: 10.11646/zootaxa.4859.4.3, http://zenodo.org/record/453729
Three-dimensional numerical analysis of switching properties of high-speed and non-volatile nanoelectromechanical memory
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Articulatory effects of vowel context on fricatives: an MRI study
No full textMagnetic resonance imaging (MRI) is increasingly used in speech production research, particularly to obtain three-dimensional images of sustainable sounds such as fricatives or vowels. However, acoustic studies of fricatives [Shadle et al., Proc. ETRW, 193-196 (1996)] have shown that the spectral shape varies with vowel context, with the amount of variation depending on the fricative. This study, therefore, uses MRI to study the articulatory correlates of vowel context effects on fricatives. Two subjects (male French, female American English) for whom a large acoustic, aerodynamic, and articulatory database of fricatives already existed, were studied. Three different imaging methods were used that varied in acquisition time, image quality, and image extent: midsagittal turbo-flash (2 s), midsagittal spin-echo (15 s), and full coronal and axial spin-echo scans (approx. 2 min each). The subjects uttered the fricatives [f, theta, s, S] in vowel contexts [a, i, u]. Results indicate that not only are vowel context effects preserved in the longer duration images, they are often heightened. [f] showed the greatest variation in configuration with vowel context. Comparison to acoustic results and other MRI studies will be presented. [Work supported by ATR HIP Laboratories, while the first author was an invited researcher at ATR.]
Normalidad y anomalía: Acerca de "Me convertiré en momia" de Shimada Masahiko
No full textEn este ensayo se analiza el relato "Me convertiré en momia" (1990) de Shimada Masahiko (1961) desde una perspectiva de historia intelectual, comprobando cómo Shimada se posiciona como narrador posmoderno japonés representativo de la literatura de los ochenta-noventa, en clave de transgresión icónico-cultural. En el relato analizado se presta atención a referentes de la historia literaria japonesa, tanto como a referentes de la literatura universal. Shimada, como autor posmoderno comprometido con "el fin de las ficciones" (Yoshimoto Takaaki), entre ellas la ficción de las literaturas nacionales, se sitúa pretendidamente en el "exterior" (Karatani Kojin) del espacio discursivo-literario
Estudio preliminar sobre el efecto de la alimentación de cerdos con garbanzo (cicer arietinum) en las características de la canal
No full textEl garbanzo porquero es un cultivo de temporal que se cosecha en la región del Bajío y que se emplea tradicionalmente en la alimentación animal. Estudios con cerdos han de-mostrado que esta leguminosa puede sustituir satisfactoriamente al maíz y la pasta de soya en raciones para lechones en crecimiento (Shimada y Brambila, 1967a). El grano es marginal en aminoácidos azufrados para el cerdo (Shimada y Brambila, 1967a, b; Shimada y Avila, 1975) y su contenido y disponibilidad de lisina son elevados (Casarín y Bravo, 1972)
Yoshiko Shimada : Divide and Rule
No full textOsborne discusses some of the issues at stake in Shimada's work, namely the role and situation of Japanese women during the war, and the government's military propaganda in relation to its influence on the mind set of contemporary Japan. The author elaborates on the artist's use of archival photos and historic details which combine the domestic and the political to produce confrontational pieces. Texts by the artist. Biographical notes. 8 bibl. ref
La transmission intergénérationnelle comme source de capacité dynamique
No full textNational audienceCe chapitre aborde la transmission intergénérationnelle comme un mécanisme de maintien des répertoires de connaissance et d’action de l’organisation. Le chapitre mobilise le concept de capacité dynamique qui permet de repérer, se saisir de, et transformer un changement ou une opportunité nouvelle. En première analyse, on pourrait penser que la transmission intergénérationnelle reconduit, voire cultive, l’inertie endogène et que les capacités dynamiques participent de la proactivité endogène. Le travail empirique et les analyses de Sakura Shimada suggèrent que les choses sont plus compliquées : la transmission intergénérationnelle régénère les répertoires existants car les jeunes arrivent avec un autre bagage, une autre expérience, une autre vision du monde et donc revisitent autant qu’ils absorbent les répertoires en place, les faisant évoluer au passage. En outre, le rafraichissement interne apporté participe d’une capacité renouvelée de proactivité endogène, y compris quand les histoires d’épopées menées par les anciens viennent alimenter les volontés intrapreneuriales et les aspirations au changement des plus jeunes.Ce chapitre aborde la transmission intergénérationnelle comme un mécanisme de maintien des répertoires de connaissance et d'action de l'organisation. Le chapitre mobilise le concept de capacité dynamique qui permet de repérer, se saisir de, et transformer un changement ou une opportunité nouvelle. En première analyse, on pourrait penser que la transmission intergénérationnelle reconduit, voire cultive, l'inertie endogène et que les capacités dynamiques participent de la proactivité endogène. Le travail empirique et les analyses de Sakura Shimada suggèrent que les choses sont plus compliquées : la transmission intergénérationnelle régénère les répertoires existants car les jeunes arrivent avec un autre bagage, une autre expérience, une autre vision du monde et donc revisitent autant qu'ils absorbent les répertoires en place, les faisant évoluer au passage. En outre, le rafraichissement interne apporté participe d'une capacité renouvelée de proactivité endogène, y compris quand les histoires d'épopées menées par les anciens viennent alimenter les volontés intrapreneuriales et les aspirations au changement des plus jeunes
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