1,721,024 research outputs found
Applicability of the FIMEC indentation test to characterize materials irradiated in the future IFMIF high intensity neutron irradiation source
No full textHigh temperature indentation tests on fusion reactor candidate materials
No full textFlat-top cylinder indenter for mechanical characterization (FIMEC) is an indentation technique employing cylindrical punches with diameters ranging from 0.5 to 2 mm. The test gives pressure-penetration curves from which the yield stress can be determined. The FIMEC apparatus was developed to test materials in the temperature range from -180 to +200 degrees C. Recently, the heating system of FIMEC apparatus has been modified to operate up to 500 degrees C. So, in addition to providing yield stress over a more extended temperature range, it is possible to perform stress-relaxation tests at temperatures of great interest for several nuclear fusion reactor (NFR) alloys. Data on MANET-II, F82H mod., Eurofer-97, EM-10, AISI 316 L, Ti6Al4V and CuCrZr are presented and compared with those obtained by mechanical tests with standard methods. (c) 2007 Elsevier B.V. All rights reserved
Structural and mechanical properties of welded joints of reduced activation martensitic steels
No full textGas tungsten arc welding and electron beam welding methods were used to realise welding pools on plates of reduced activation martensitic steels. Structural and mechanical features of these simulated joints have been investigated in as-welded and post-welding heat-treated conditions. The research allowed to assess how each welding technique affects the original mechanical properties of materials and to find suitable post-welding heat treatments. This paper reports results from experimental activities on BATMAN II and F82H mod. steels carried out in the frame of the European Blanket Project - Structural Materials Program. © 2002 Elsevier Science B.V. All rights reserved
Dipyrazolo[5,4-b:3',4'-d]pyridines. Synthesis, inhibition of benzodiazepine receptor binding and structure-activity relationships.
No full textSome 2,6,8-trisubstituted dipyrazolo[5,4-b:3',4'-d]pyridin-3-ones related to the CGS series were synthesized and tested for their ability to displace [3H]flunitrazepam binding from bovine brain membranes. However the affinity for the benzodiazepine receptor of the tested compounds was lower than that of the CGS series, although it was comparable to that of chlordiazepoxide. It follows that some structure-activity relationships on the tested compounds can be drawn
TRICYCLIC HETEROAROMATIC SYSTEMS - [1]BENZOPYRANO-PYRAZOL-4-ONES AS BENZODIAZEPINE RECEPTOR LIGANDS
No full textThe synthesis of a series of 8-substituted 1,4-dihydro-1-aryl-3-methyl-[1]benzopyrano[3,4-d]pyrazol-4-ones (series 7) and 2,4-dihydro-2-aryl-3-methyl[1]benzopyranol[4,3-c]pyrazol-4-ones (series 8) is reported. Compounds of series 7 and 8 were tested for their ability to displace [H-3]flunitrazepam from bovine brain membranes and for their in vitro biological activity. The results allowed some conclusions to be drawn about the structural requirements of the benzodiazepine recognition site within this class of unusual ligands
Pyrazolo[4,5-c]quinolines. 2. Synthesis and specific inhibition of benzodiazepine receptor binding.
No full textA series of 1-aryl-3,5-dimethyl-4,5-dihydro-1H-pyrazolo[4,5-c]quinolin-4-ones (2a-e) and 1-aryl-3-methyl-1H-pyrazolo[4,5-c]quinolines (3-7a-e) bearing different substituents at position 4 were prepared and tested for their ability to displace specific [3H]flunitrazepam binding from bovine brain membranes. The 5-N-methyl derivatives 2a-c,e were the compounds that bound with the highest affinity within this class. The replacement of the carbonyl group with other substituents and the resulting aromatization of the pyridine moiety greatly decreased the binding affinity. From a Lineweaver-Burk analysis on the most active compound 2b, it appears that the inhibition is a competitive one
TRICYCLIC HETEROAROMATIC SYSTEMS - SYNTHESIS AND A(1) AND A(2A) ADENOSINE BINDING ACTIVITIES OF SOME 1-ARYL-1,4-DIHYDRO-3-METHYL[1]BENZOPYRANO[2,3-C]PYRAZOL-4-ONES, 1-ARYL-4,9-DIHYDRO-3-METHYL-1H-PYRAZOLO[3,4-B]QUINOLIN-4-ONES, AND 1-ARYL-1H-IMIDAZO[4,5-B]QUINOXALINES
No full textThe syntheses and A(1) and A(2a) adenosine binding activities of some new 1-aryl-1,4-dihydro-3-methyl[1]benzopyrano[2,3-c]pyrazol-4-ones, 1-aryl-4,9-dihydro-3-methyl-1H-pyrazolo[3,4-b]-quinolin-4-ones, and 1-aryl-1H-imidazo[4,5-b]quinoxalines are reported. Some compounds show A(1) adenosine receptor affinity and selectivity. Structure-activity relationships on these new classes of adenosine receptor ligands are defined
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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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