262,154 research outputs found
Carbon dioxide reforming of methane with Pt catalysts using microwave dielectric heating
No full textSound radiation from a generic bypass duct with bifurcations
No full textThe influence of bifurcations in an aero-engine bypass duct on noise radiation was investigated through high-order accurate three-dimensional numerical simulations. The physical process was described by a set of acoustic perturbation equations (APE), with a background mean flow. Four bifurcation arrangements, with an airfoil cross-section, were regularly placed in circumferential direction. Results of the simulations were compared with those of a clean duct case. A circumferential mode of m=12 with radial mode of n=1 and multi-n modes at a source frequency of 1547 Hz were set as acoustic inputs. Acoustic modes
interfered with the bifurcations resulting in a doubled circumferential mode pattern in the near field acoustic pressure distribution and slightly stronger sound
pressure level behind the bifurcations. Far field noise computations indicated 3.2 dB and 2.0 dB sound pressure level increases for radial mode of n=1 and multi-n
modes respectively. The bifurcations did not alter the radiation angle. A comparison was also made between APE and linearlised Euler equations (LEE). Results showed that the APE simulation produced almost identical far field sound
prediction to the LEE, with a small difference (< 0.8dB) at the main radiation peak angle
ZHANG, F. & LIU, X-W. (2009) A review of the subgenus Diestrammena (Gymnaeta) from China (Orthoptera: Rhaphidophoridae Aemodogryllinae). Zootaxa, 2272, 21-36.
No full textZhang, F., Liu, X-W. (2009): ZHANG, F. & LIU, X-W. (2009) A review of the subgenus Diestrammena (Gymnaeta) from China (Orthoptera: Rhaphidophoridae Aemodogryllinae). Zootaxa, 2272, 21-36. Zootaxa 2288 (1): 68, DOI: 10.11646/zootaxa.2288.1.5, URL: http://dx.doi.org/10.11646/zootaxa.2288.1.
Traces and shards of self-injury: Strange accounting with “Author X”
No full textIn this strange account autoethnography, three or four authors explore their lived experiences with self-injury. Strange accounting is both a post-modern style of text, and a method for keeping identities concealed when risks and secrets are in play. Author X, a post-modern place-keeper for an anonymous author who may or may not have contributed to this manuscript, introduces a new dimension and layer of concealment. With Author X in-play and under erasure, the reader will never be sure if there were three or four authors on this manuscript. Through strange accounting, a post-structuralist/postmodernist frame will be applied to understanding the self-injury experience. We frame self-injury as a social practice and, for some, an everyday norm, while remaining acutely aware of the stigma surrounding the topic of self-injury. Each of us, coupled with Author X, provide the others cover to trace stories of self-injury through the literature, our flesh, and our lives
Whittieria engelmannii Li Bing Zhang & Liang Zhang ex Li Bing Zhang, Liang Zhang & X. Wan 2022, comb. nov.
No full textWhittieria engelmannii (Prantl 1883: 351) Li Bing Zhang & Liang Zhang ex Li Bing Zhang, Liang Zhang & X.Wan, comb. nov. Basionym: Ophioglossum engelmannii Prantl (1883: 351) ≡ “ Whittieria engelmannii (Prantl) Li Bing Zhang & Liang Zhang ” (2022: 24), nom. inval. Type:— U.S.A. Texas: Comanche Spring, New Braunfels, May 1849, F.J. Lindheimer 1281 (lectotype MO201251!, here designated, isolectotypes FI003993!, K001057659!, MEXU00085077!, MEXU00000139!, TEX00348044!). Remaining syntypes: U.S.A. Texas: May 1849, F.J. Lindheimer 95 (MO251338!). U.S.A. Texas: Comanche Spring, Bexar County, May 1849, F.J. Lindheimer 53 (GH00021725!, FI003992!). Notes:— In the protologue (Prantl 1883), there were no specific gatherings cited but only “Nordamerika” (North America) was given. According to Stafleu & Cowan (1983: 379), K.A.E. Prantl’s herbarium and types are mainly at “HBG (esp. Pteridophyta)”. We searched the database of HBG (www.herbariumhamburgense.de), and only found three gatherings of Ophioglossum from Namibia and South Africa. In Tropicos (tropicos.org), four gathering are indicated as “T” (type) or “ST” (syntypes). We found three of the four gatherings in various herbaria (see above) in JSTOR (plants.jstor.org) but could not find Engelmann s.n collected before 1883. We here designated the one of the duplicates of F.J. Lindheimer 1281 at MO as the lectotype. This species has three unique features: growing in basic soils, double venation (large areoles of the sterile blade subdivided into smaller areoles; Wagner & Wagner 1994), and 71 days of spore germination time (Whittier 1981, Zhang & Zhang 2022). Distribution:— United States, Mexico, and Central America.Published as part of Wan, Xia, Zhang, Liang & Zhang, Li-Bing, 2022, Validation and lectotypification of the fern combination Whittieria engelmannii (Ophioglossaceae), pp. 205-206 in Phytotaxa 567 (2) on pages 205-206, DOI: 10.11646/phytotaxa.567.2.10, http://zenodo.org/record/714165
Discussion on manufacturing techniques of Chen Zhang Pot
No full textThe Chen Zhang Pot, made in the late Warring States period is an openwork bronze pot with gold and silver inlay. It was identified as a first-class historical relic of the nation by the State Administration of Cultural Heritage in 2001. To explore its manufacturing techniques, XRF, CT and X-Ray photograph microscopic observation were adopted for the non-destructive examination of the Chen Zhang Pot. The analysis data show that many parts of the Chen Zhang Pot were cast separately, and then assembled. It also shows that the composition proportion of each part of the Chen Zhang Pot is different; and the bronze color, hardness and tensile strength are different for each alloy proportion. A variety of decoration techniques were adopted in the manufacturing process, which make the color more diverse and gorgeous. The openwork decoration is the most complex part of the pot, and the gold and silver decoration technique also represents the high level manufacturing technology in the Warring States period. In summary, the Chen Zhang Pot is a unique art treasure, and as a specimen it allows us to study the bronze casting technology in the Warring States period
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