9,614 research outputs found
A high-resolution MAS NMR study on the potential catalysts Mo/HBeta for olefin metathesis: The interaction of Mo species with HBeta zeolite
No full textThe interfacial interaction of Mo species with the HBeta zeolite was studied by multinuclear MAS NMR, XRD and N-2 adsorption. As proved by the quantitative Al-27 MAS NMR, this interaction is so strong as to dealuminate the framework of HBeta, and leads to a new peak appearing at -14 ppm, which indicates the formation of crystalline Al-2(MoO4)(3). This can also be detected by XRD measurements when the Mo loading is as high as 9.0 wt.%. The corresponding quantitative Si-29 and H-1 MAS NMR spectra show that the amount of silanols and Bronsted acidic sites decrease obviously with increasing Mo loading. This also reveals an interaction between Mo species and HBeta support through an oxygen bridge resulting from condensation with the hydroxyls on the support. At higher Mo loadings, the interaction is so strong that it results in an extraction of aluminum from the zeolite framework, and subsequently appearance of Al-2(MoO4)(3) and loss of Bronsted acidic sites. These can be correlated to the low catalytic activity of Mo/HBeta in metathesis of ethylene and 2-butylene to propylene. (c) 2006 Elsevier B.V. All rights reserved
Estimated parameter values of model (2) based on data of Kansas City (KC), Saint Louis (SL), San Francisco (SF), Missouri (MO), Illinois (IL), and Arizona (AZ).
No full textEstimated parameter values of model (2) based on data of Kansas City (KC), Saint Louis (SL), San Francisco (SF), Missouri (MO), Illinois (IL), and Arizona (AZ).</p
Sligo & Eastern (SL&E) N.G. Shay
No full textA photograph print showing a Sligo & Eastern (SL&E) [#4 or # 6 ]narrow gauge geared shay, hayling a load of cut logs, in the Ozark Mountains from Sligo to Bixby,MO. Road abandoned
CR1 Knops blood group alleles are not associated with severe malaria in the Gambia
No full textThe Knops blood group antigen erythrocyte polymorphisms have been associated with reduced falciparum malaria-based in vitro rosette formation (putative malaria virulence factor). Having previously identified single-nucleotide polymorphisms (SNPs) in the human complement receptor 1 (CR1/CD35) gene underlying the Knops antithetical antigens Sl1/Sl2 and McC(a)/McC(b), we have now performed genotype comparisons to test associations between these two molecular variants and severe malaria in West African children living in the Gambia. While SNPs associated with Sl:2 and McC(b+) were equally distributed among malaria-infected children with severe malaria and control children not infected with malaria parasites, high allele frequencies for Sl 2 (0.800, 1,365/1,706) and McC(b) (0.385, 658/1706) were observed. Further, when compared to the Sl 1/McC(a) allele observed in all populations, the African Sl 2/McC(b) allele appears to have evolved as a result of positive selection (modified Nei-Gojobori test Ka-Ks/s.e.=1.77, P-valu
Gymnodiptychus integrigymnatus Mo
No full text<i>Gymnodiptychus integrigymnatus</i> Mo, in Chu & Chen, 1989 <p> Cao et al. (1981: 125) were the first to use the name <i>Gymnodiptychus integrigymnatus</i>. They wrote “ <i>G. integrigymnatus</i> feeds mainly on fishes” and mentioned in a footnote that “…this information was provided by Mr. Huang Shunyou”. In the following sentence they stated, that “ <i>Gymnodiptychus</i> species obviously differ from <i>Diptychus</i> species in having reduced scales, especially in <i>G. integrigymnatus</i>, where the scales on the humeral region and lateral line are reduced.” These words do not diagnose the new species from its congeners and thus cannot be treated as a statement of characters purported to differentiate the taxon. Because of the lack of a diagnosis for <i>G. integrigymnatus</i> in Cao et al. (1981), the conditions for availability in this work do not satisfy those specified in Articles 13.1.1 and 13.1.2 of the International Code of Zoological Nomenclature (ICZN, 1999). The name <i>G. integrigymnatus</i> Cao, Chen, Wu and Zhu, 1981 should therefore be treated as a nomen nudum.</p> <p> While Mo (1989: 319–321, fig. 298 and 299) provided the first complete description of <i>G. integrigymnatus</i>, the authorship of the name was given as Huang in Cao et al. (1981). Mo (1989) listed 12 specimens (deposited in Kunming Institute of Zoology (KIZ)), collected from the vicinity of Ruidian Town and Mingguang Town, Tengchong County, Yunnan Province, as material examined.</p> <p> In their account of <i>G. integrigymnatus</i>, Wu & Wu (1992: 434–435, fig. 118) cite as sources “…the draft of the Schizothoracinae fishes of Yunnan” (type localities: Ruidian Town and Mingguang Town, Tengchong County, Yunnan Province) by Huang in 1980 and Mo (1989), attributing authorship of the name to Huang in the unpublished draft.</p> <p> Huang in Chen & Huang (1998: 231–233, fig. 162) described <i>G. integrigymnatus</i> as a new species, stating in a footnote that “…this is the first formal description of the species since it was cited by Cao et al. (1981) ”. The second reference Chen & Huang (1998) cited was Mo (1989). Chen & Cao (2000: 348–349, fig. 215) subsequently gave the authorship of <i>G. integrigymnatus</i> as Huang (1998).</p> <p> Mo (1989) attributed the authorship of <i>G. integrigymnatus</i> to Huang in Cao et al. (1981). According to Article 13.1 of the International Code of Zoological Nomenclature (ICZN, 1999), the name <i>G. integrigymnatus</i> Mo, in Chu & Chen, 1989, is available and should be regarded as the first formal description of this taxon. Following Article 21.1 and Article 50.1 of the Code, the publication date of 1989 and the authorship of Mo should be adopted for <i>G. integrigymnatus</i>.</p> <p> According to Article 72.1 of the Code (ICZN, 1999), the 12 specimens examined by Mo (1989) and deposited in KIZ should be treated as syntypes. Some of these specimens are also listed as types by Huang in Chen & Huang (1998) in his description of <i>G. integrigymnatus</i> (the material from Mingguang Town, Tengchong County, Yunnan listed in Mo, 1989, is not mentioned by Huang in Chen & Huang, 1998). The indication in Chen & Huang (1998) that <i>G. integrigymnatus</i> was being described for the first time is therefore incorrect.</p> <p> We examined the specimens of <i>G. integrigymnatus</i> deposited in KIZ. There are a total of 39 specimens collected before 1980, of which 27 are from Ruidian Town, Tengchong, Yunnan (23 specimens collected in February 1978 and 4 specimens collected in April 1976) and 12 are from Minguang Town, Tengchong, Yunnan (in April 1976). The standard lengths (SL) range from 27.8 to 107.3 mm. Of these 39 specimens, 13 are measured 73.0–110.0 mm SL and 89.0–133.0 mm TL respectively, which corresponds to Mo (1989). The number of specimens listed by Mo (1989) should be 13, not 12 (a counting error made by Mo, 1989). According to Articles 72.1 and 73.2 of the Code (ICZN, 1999), the 13 specimens examined by Mo (1989) are syntypes. The type series of <i>G. integrigymnatus</i> are as follows: KIZ 764003–006, 4 specimens, 85.6–106.4 mm SL, April 1976, Ruidian Town, Tengchong County, Yunnan; KIZ 764178 1 specimen, 97.7 mm SL, April 1976, Mingguang Town, Tengchong County, Yunnan; KIZ 78020315–321, KIZ 78020323, 8 specimens, 74.8–107.3 mm SL, February 1978, Ruidian Town, Yunnan Province, China.</p>Published as part of <i>Yang, Jian, Chen, Xiaoyong & Yang, Junxing, 2008, Clarification of the nomenclatural status of Gymnodiptychus integrigymnatus (Cypriniformes, Cyprinidae), pp. 67-68 in Zootaxa 1897</i> on pages 67-68, DOI: <a href="http://zenodo.org/record/184474">10.5281/zenodo.184474</a>
Estimated parameter values of the global functions f(t), g(t) and h(t) based on data of Kansas City (KC), Saint Louis (SL), San Francisco (SF), Missouri (MO), Illinois (IL), and Arizona (AZ).
No full textEstimated parameter values of the global functions f(t), g(t) and h(t) based on data of Kansas City (KC), Saint Louis (SL), San Francisco (SF), Missouri (MO), Illinois (IL), and Arizona (AZ).</p
Self-Organization of a Carbide Superlattice during Deposition of Carbon on Mo
Get PDFFormation and evolution of a carbide superlattice (SL) during C deposition on Mo have been studied using molecular beam epitaxy techniques. The ordering of the SL is energetically driven, such that the interplay between strain and surface energies determines the length scale of the SL. Surface precipitation of C occurs within a narrow range of SL spacing that appears to control the size and spacing of the precipitates leading to a possible mechanism for nucleation of single-walled carbon nanotubes
Descriptive Statistics of Kansas City (KC), Saint Louis (SL), San Francisco (SF), Missouri (MO), Illinois (IL), and Arizona (AZ) daily COVID-19 data from March 10, 2020 to March 7, 2021.
No full textDescriptive Statistics of Kansas City (KC), Saint Louis (SL), San Francisco (SF), Missouri (MO), Illinois (IL), and Arizona (AZ) daily COVID-19 data from March 10, 2020 to March 7, 2021.</p
Quantum and its irreducible representations
Get PDFWe define for real a unital -algebra
quantizing the universal enveloping
-algebra of . The -algebra
is realized as a -subalgebra of the
Drinfeld double of and its dual Hopf -algebra
, generated by the equatorial Podle\'s sphere coideal
-subalgebra of and
its associated orthogonal coideal -subalgebra . We then classify all the irreducible
-representations of .Comment: 22 pages; author accepted manuscrip
Finite oscillator models described by the Lie superalgebra sl(2|1)
No full textWe investigate new models for a finite quantum oscillator based upon the Lie superalgebra sl(2|1), where the position and momentum operators are represented as odd elements of the algebra. We discuss properties of the spectrum of the position operator, and of the (discrete) position wavefunctions given by (alternating) Krawtchouk polynomials
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