170,041 research outputs found
Use of overtone bands to monitor the state of the catalyst active phases during infrared studies of adsorption and catalytic reactions
No full textOvertone bands are observable in the i.r. spectra of mixed and supported oxide catalysts, and may be informative on the state of the active phases and their interactions with absorbates. In the cases of supported V2O5/TiO2, MoO3/Al2O3 and WO3/Al2O3 the behaviour of such bands indicates that single uncoupled MO bonds are exposed on the surface. In the case of bulk VPO catalysts they are informative on the presence of oxidized phases. © 1986
US v. LaValley, 999 F. 2d 663 - Court of Appeals, 2nd Circuit 1993
No full textDefendant-appellant Mark L. LaValley appeals from a judgment of conviction and sentence entered in the United States District Court for the District of Vermont (Billings, J.) following his plea of guilty to one count of conspiracy to distribute and possess with intent to distribute cocaine, in violation of 21 U.S.C. §§ 846, 841(a)(1) and 841(b)(1)(C) (1988). The district court found LaValley to be a steerer or a facilitator and for that reason rejected his claim that he was a minor participant in the offense. Accordingly, the district court denied LaValley\u27s application, made pursuant to U.S.S.G. § 3B1.2(b), for a two-level reduction in his base offense level. LaValley was sentenced to a term of imprisonment of fifteen months to be followed by a three-year term of supervised release. For the reasons that follow, the sentence is vacated, and the case is remanded to the district court for an assessment of LaValley\u27s role in the offense and for resentencing
Recommended from our members
US v. LaValley, 999 F. 2d 663 - Court of Appeals, 2nd Circuit 1993
No full textDefendant-appellant Mark L. LaValley appeals from a judgment of conviction and sentence entered in the United States District Court for the District of Vermont (Billings, J.) following his plea of guilty to one count of conspiracy to distribute and possess with intent to distribute cocaine, in violation of 21 U.S.C. §§ 846, 841(a)(1) and 841(b)(1)(C) (1988). The district court found LaValley to be a steerer or a facilitator and for that reason rejected his claim that he was a minor participant in the offense. Accordingly, the district court denied LaValley\u27s application, made pursuant to U.S.S.G. § 3B1.2(b), for a two-level reduction in his base offense level. LaValley was sentenced to a term of imprisonment of fifteen months to be followed by a three-year term of supervised release. For the reasons that follow, the sentence is vacated, and the case is remanded to the district court for an assessment of LaValley\u27s role in the offense and for resentencing
Fourier transform I.R. evidence of the formation of dioxymethylene species from formaldehyde adsorption on anatase and thoria
No full textHCHO adsorption on activated thoria produces, at 240 K, a species characterized as dioxymethylene; by heating at room temperature, it leads to formate and methoxy groups: the three species are observed by adsorption of HCHO on anatase at room temperature
FT-IR study of the effect of pretreatment on the surface properties of alumina produced by flame hydrolysis of aluminium trichloride
No full textA comparison of the behaviour of two samples of alumina obtained by pyrolysis of AlCl3 or thermal dehydration of boehmite has shown that the former contains chloride impurities that modify the spectra in the ν(OH) region as well as poison the strongest Lewis acid sites. The reactivity towards CO2, producing bicarbonates species, is also affected. Heat treatment in the presence of water partially eliminates Cl- and leads to a surface quite similar to that of the sample prepared by thermal dehydration of boehmite. © 1986
Thermal evolution of the adsorbed methoxy species on CexZr1-xO2 solid solution samples: a FT-IR study
No full textStudy of bulk and surface reduction by hydrogen of CexZr1-xO2 mixed oxides followed by FT-IR spectroscopy and magnetic balance
No full textA TPD, FT-IR and Catalytic Study of the Interaction of Methanol with Pure and KOH DOPED TiO 2 Anatase
No full textThe interaction of methanol with pure and KOH doped TiO 2 anatase has been studied by means of TPD and FT-IR techniques, and by pulse reactor measurements. Three different samples of TiO 2, have been considered. FT-IR spectra have allowed identification of a number of H-bonded and chemisorbed species present on the TiO 2, surface. The nature of such species has been related to the results of TPD experiments and of pulse reactor measurements. By taking into account the different experimental conditions of the three techniques, a unitary picture of the CH 3OH-TiO 2 surface interaction is arrived at. © 1985
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
- …
