109,404 research outputs found
Big Mac parity, income, and trade
No full textNontraded inputs account for the lion's share of a Big Mac price (Ong 1997, Parsley and Wei 2003). Major departures from Big Mac PPP may then be explained by the Balassa-Samuelson income differences effect, as shown e.g. by Click (1996). But it has been argued that Click''s result is not robust to changing estimation methods, sample of countries, and time period (Fujiki and Kitamura 2003). Here we address a key theoretical distinction between high and low income countries for the Balassa-Samuelson effect to be properly evaluated. Since this distinction is missing in Click''s analysis, we revisit his finding and take a sample which is distinct (in terms of both set of countries and time period) to meet Fujiki-Kitamura''s criticism. We find that distinguishing high from low income makes no harm to Click''s result. But we also find that openness to trade (viewed as a proxy for trade barriers) helps to explain departures from Big Mac PPP.
Influence of extrusion conditions on the superplastic properties of a Mg-8%Li alloy processed at room temperature by equal-channel angular pressing
No full textIt is well known that alpha+beta duplex structure Mg-Li alloys exhibit an excellent superplastic ductility at intermediate temperatures. Moreover, many researchers have demonstrated that the ductility enhancement in Mg alloys could be achieved by refining its grain structure using conventional thermo-mechanical treatments, powder metallurgy and severe plastic deformation. Among the severe plastic deformation methods, equal-channel angular pressing (ECAP) can produce uncontaminated, fully dense and large bulk materials with submicrometer or even nanometer grain structures effectively.Processing by ECAP was successfully performed on a Mg-8mass%Li alloy at room temperature using a solid die having an internal channel angle of 135 degree. A refined and uniform dispersion of the alpha and beta phases was achieved by applying ECAP processing for four passes at room temperature by comparison with the alloy in the extruded condition. The elongations to failure in tensile testing increase with a decrease in the extrusion temperature but they are reasonably independent of the extrusion speed within the range from 1-10mm/s. The Mg-8%Li alloy exhibits excellent superplastic properties at 473K after extrusion and ECAP including a maximum elongation of 1780%. The strain rate sensitivity was measured as 0.4-0.6 under the optimum superplastic conditions
Cirsium nishiokae Kitamura 1968
No full text2. Cirsium nishiokae Kitamura (1968: 75). Fig. 8. Type: — INDIA. Darjeeling, below Tonglu, 2900 m, 16 September 1964, H. Hara s.n. (holotype: TI00080535!). Fig. 5 A–C. = Cirsium chrysolepis Shih (1984: 451), syn. nov. Type: — CHINA. Tibet, Nyalam County, alt. 3500 m, 27 August 1972, Xizang Exped. Pl. Med. 1575 (holotype: PE00455486!, isotype: PE00455488!). Figs. 5 E–F, 6 A. Description: —Herbs 1–2 m tall, perennial. Stem erect, ribbed, branched above, unwinged, glabrous or sparsely cobwebby. Basal leaves with winged petiole, wing spiny or with spiny teeth; leaf blade elliptic, ca. 30 × 15 cm, pinnatipartite or pinnatisect; segments ca. 6 pairs, lanceolate or ovate-lanceolate, with unequal triangular teeth fringed with 0.3–1 cm spine. Cauline leaves gradually decreasing upwards, sessile, semiamplexicaul, elliptic to lanceolate, pinnatilobate or pinnatipartite; segments 3–4 pairs, lanceolate to obliquely triangular-ovate, with 2–4 unequal triangular teeth fringed with spinules less than 0.5 mm and with a 5–10 mm apical spine. All leaves discolorous, abaxially grayish white and densely or sparsely tomenta, adaxially green, rough, and densely or sparsely covered with ca. 0.5 mm spinules. Capitula corymbose, erect. Involucre campanulate, 3–3.5 cm in diam., glabrous. Phyllaries imbricate, in ca. 8 rows, straight, appressed; outer and middle phyllaries elliptic to lanceolate, 8–25 × 2–3 mm, margin above base expanded into yellowish, scarious lacerate wings, apex narrowed into a spine, shorter than inner ones; inner phyllaries lanceolate to linear, apically expanded into a short and narrow, acuminate, and spine-tipped appendage. Florets bisexual. Corolla purplish red. Achene ca. 4.5 mm. Pappus bristles yellowish, ca. 1.6 mm. Phenology: —Flowering from July to October. Distribution and habitat: — Cirsium nishiokae is distributed in China (Tibet), India (Darjeeling) and Nepal. It mainly grows on grass slopes at elevations of 2500–3900 m above sea level. Additional specimens examined:— CHINA. Tibet: Nyalam, 25 June 1966, Y. T . Zhang s.n. (PE00455487); Nyalam, 17 Sep. 1992, J . D. Chen 92242 (PE01837380); Nyalam, alt. 3285 m, 18 Nov. 2011, Y. S . Chen 92242 (PE02118071); Nyalam, alt. 3300 m, 20 Aug. 2001, H. N . Tan et al. 730 (PE01772078, PE01772077).— NEPAL. Dhawalagiri Zone, Mustang District, Annapurna Himal, Mardi Khola, alt. 13000 ft, 19 Sep. 1954, J .D.A. Stainton, W.R. Sykes & L.H.J. Williams 8509 (BM011033556, E00463841); Dhawalagiri Zone, Mustang District, Tukucha, alt. 10500 ft, 26 Aug. 1954, J .D.A. Stainton, W.R. Sykes & L.H.J. Williams 7457 (BM011033572, E00463842); Dhawalagiri Zone, Mustang District, Tukucha, alt. 10500 ft, 12 Sep. 1954, J .D.A. Stainton, W.R. Sykes & L.H.J. Williams 7803 (BM011033571, E00463843); Dhawalagiri Zone, Mustang District, Tukucha, alt. 10500 ft, 22 Aug. 1954, J . D. A. Stainton, W.R. Sykes & L.H.J. Williams 7395 (BM011033579, BM011033573); Dhawalagiri Zone, Myagdi District, alt. 3700 m, 9 Sep. 1996, M . Mikage et al. 9684133 (KATH027754); Dhawalagiri Zone, Myagdi District, alt. 3160 m, 18 Sep. 1996, M . Mikage et al. 9682802 (KATH019466); Koshi Zone, Solukhumbu District, Lukla, alt. 2820 m, 30 Sep. 1974, J. H . Hass 2902 (L0207731); Mechi Zone, Taplejung District, alt. 2800 m, 25 Oct. 1991, D. G . Long et al. 1033 (KATH027504, E00463839); Mechi Zone, Taplejung District, Minchin Dhap-Mul Pokhari, 29 Oct. 1963, H . Hara et al. 6310299 (BM011033557, E0071931, TI00080532, TI00080533, TI00080534, BM, TI); Rapti Zone, Rukum District, Dogadi Khola, alt. 12000 ft, 8 Aug. 1954, J .D.A. Stainton, W.R. Sykes & L.H.J. Williams 3796 (BM011033554, BM011033558, E00463840); Sagarmatha Zone, Solukhumbu District, alt. 3453 m, 15 Sep. 2005, M. F . Watson et al. DNEP3 BX92 (KATH056019, KATH011396, E00248957); Sagarmatha Zone, Solukhumbu District, alt. 3000 m, 21 Aug. 1985, H . Ohba et al. 61541 (KATH018970); Seti Zone, Baglung District, Dhorpatan, alt. 2800 m, 8 Sep. 1982, K. R . Rajbhandari & K.J. Malla 6413 (KATH055988, KATH055978, KATH056184). Notes: — Cirsium chrysolepis Shih was described on the basis of one collection, Xizang Exped. Pl. Med. 1575 (PE, Fig. 5 D, Fig. 6 A), from Nyalam, Tibet, China. In the protologue, the author did not compare it with any species, but in Flora Reipublicae Popularis Sinicae, Shih (1987) stated that it was close to C. flavisquamatum Kitamura (1974: 16), a species from Nepal, but differed by leaves discolorous, abaxially grayish white and densely or sparsely tomentose. But he neglected C. nishiokae Kitamura, a widespread species in Nepal and India. Cirsium nishiokae was described on the basis of one collection, H. Hara s.n. (TI, Fig. 6 A), from Darjeeling, India. Trough examination of the type materials and other specimens, we found that C. nishiokae and C. chrysolepis have no obvious differences in main traits between their type specimens, but there are some differences in the density of spinules on the abaxial leaf surface. But this feature is very variable in Cirsium. For example, there is a continuous variation from sparse to dense on the abaxial leaf surface of C. lipskyi. Cirsium nishiokae is distributed in Nepal and India at altitudes of 2500–3900 m, while C. chrysolepis is only found in Nyalam, Tibet, China at an altitude of 3500 m, where it is very close to the border to Nepal (Fig. 7). Therefore, we think they belong to the same species and treat C. chrysolepis as a synonym of C. nishiokae.Published as part of Jin, Zi-Chao & Chen, You-Sheng, 2022, Cirsium lipskyi (Asteraceae) is reinstated for C. interpositum, and C. chrysolepis is a new synonym of C. nishiokae, pp. 87-96 in Phytotaxa 547 (1) on pages 94-96, DOI: 10.11646/phytotaxa.547.1.8, http://zenodo.org/record/655693
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Effects of team-based computer interaction: The media equation and game design considerations
No full textThe current paper applies media equation research to video game design. The paper presents a review of the existing media equation research, describes a specific study conducted by the authors, discusses how the findings of the study can be used to inform future game design, and explores how other media equation findings might be incorporated into game design. The specific study, discussed in detail in the paper, explores the notion of team formation between humans and computer team-mates. The results show that while highly experienced users will accept a computer as a team-mate, they tend to react more negatively towards the computer than to human teammates (a 'Black Sheep' Effect)
Investigations on Structural and Transport Properties of Mixed Oxide Systems
No full textNot availabl
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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