322,988 research outputs found
Arbitrary shaped aperture/patch fss’s in planar phased arrays. Full-domain and sub-domain basis functions
No full textA MULTIMODE EQUIVALENT NETWORK APPROACH FOR ANALYSIS OF PLANAR AND CYLINDRICAL FREQUENCY SELECTIVE SURFACES
No full textRates of C-S bond cleavage in tert-alkyl phenyl sulfide radical cations
No full textRadical cations of tert-alkyl phenyl sulfides have been generated photochemically in MeCN in the presence of the N-methoxyphenanthridinium cation (MeOP+), and the rates of C-S bond cleavage have been determined by laser flash photolysis
Optimal Choice of the E.M. Expansion for Arbitrary Shaped Aperture/Patch FSSs in Planar Phased Arrays.
No full textIn this paper, we present the analysis of frequency selective surfaces (FSS), which comprise periodic arrays of patches or apertures in conducting screens, by means of the multimode equivalent network (MEN) approach. The unknown quantities are expanded in terms of piecewise sinusoidal/linear expanding functions or in terms of full domain basis functions. The latter correspond to the eigenmodes of a waveguide with the same cross section of the FSS patch/aperture. These eigenmodes are derived using BCMM (boundary contour mode matching)
Reliability of the Italian version of the International Spinal Cord Injury Pain Basic Data Set
No full textStudy design: Multicentric prospective psychometric study. Objective: To provide a translation of the International Spinal Cord Injury Pain Basic Data Set (ISCIPBDS) for Italian persons and to evaluate the interrater reliability of the translated version. Setting: Ten Italian rehabilitation centres specialized in spinal injury care. Methods: The initial translation was performed by two medical doctors who had an in-depth knowledge of spinal cord injury (SCI), and then a back translation (from Italian to English) was given to an accredited agency. Sixty-six participants with SCI (53 men, 13 women; mean ± SD age: 53.4 ± 16.0 years) were evaluated by means of the Italian version of the ISCIPBDS by two different examiners. Intraclass correlation coefficient (ICC) or Cohen’s Kappa (ĸ) was calculated to test the interrater agreement for the test−retest cases. Results: All 66 participants had at least one pain problem and 34% of them had only one type of pain. A good interrater agreement was obtained in terms of number of pain (ICC = 0.781), type of pain (ĸ = 0.683), pain intensity (ICC = 0.798), correspondence of pain localization (ĸ = 0.750), and the value of the pain interference in day-to-day activities, overall mood and night’s sleep (ICC = 0.827, ICC = 0.861 and ICC = 0.724, respectively). Eventually a prominent prevalence of neuropathic pain was recorded (64% from the first examiner and 62% from the second one). Conclusions: The authors propose the Italian version of ISCIPBDS that can be used for research and clinical evaluation of pain in SCI persons; it shows a significant interrater reliability
Oxidation of non-phenolic beta-O-aryl-lignin model dimers catalysed by lignin peroxidase. Comparison with the oxidation induced by potassium 12-tungstocobalt(III)ate
No full textThe H2O2-promoted oxidations of the non-phenolic beta -O-aryl-lignin model dimers 1-(3,4-dimethoxyphenyl)-2-phenoxyethanol (1) and 2-(4-methoxyphenoxy)-1-phenylethanol (2) catalysed by LiP at pH = 4.0 have been studied. The oxidation of 1 mainly leads to the corresponding ketone, indicating that the prevailing reaction of the intermediate radical cation 1(+.) is C alpha -H deprotonation. The oxidation of 2 forms 2-(4-methoxyphenoxy)2-phenylethanol (7, an isomer of 2), 2-phenyl-1,4-dioxaspiro[4.5]deca-6,9-dien-8-one (8) and products coming from the cleavage of the C-C bond gamma to the more electron rich ring. The formation of all these products can be rationalised by assuming that the main reaction of the intermediate 2(+.) is a nucleophilic attack of the alcoholic OH group on the ring bearing the positive charge. This leads to a spirocyclohexadienyl radical; which either is then oxidised to the dioxaspirodecadienone 8 or undergoes ring opening to give an alkoxyl radical from which the isomer of 2 and the C-C bond cleavage products may form. Support for this mechanism has been provided by a study of the oxidation of 4-MeOC6H4OCH2CD2OH and by comparing the results with those obtained when the alkoxyl radical 4-MeOC6H4OCH2CD2O . was generated from 4-MeOC(6)H(4)OCH(2)CD(2)OOt-Bu. The oxidation of 1 induced by the genuine one-electron oxidant potassium 12-tungstocobalt(iii)ate at pH = 4.0 confirms the results obtained with LiP However, under the same conditions, no fragmentation products were observed in the oxidation of 2, probably due to a fast oxidation, by potassium 12-tungstocobalt(iii) ate, of the spirocyclohexadienyl radical
Sector PCS-EBG antenna for low-cost high-directivity applications
No full textThis letter proposes a new topology of antenna based on the use of planar circularly symmetric electromagnetic band gap (PCS-EBG) with different periodicities. These periodicities are used to impose different propagation velocities of the dominant surface waves on different zones of the same dielectric substrate. The control of the dispersion characteristics guides the design together with the definition of a centered feed suitable to excite the surface waves. One prototype has been designed, manufactured and tested to prove the concept
C-S Bond Cleavage in t-Alkyl Phenyl Sulfide Radical Cations generated by Photoinduced Electron Transfer
No full textDiffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
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
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