12,067 research outputs found
Rede uitgesproken op 17 september 1956 ter gelegenheid van de erepromotie van Dr. Th. von Karman door de promotor Dr. C.B. Biezeno
No full textRede uitgesproken door prof. C.B. Biezeno ter gelegenheid van de erepromotie aan de TH Delft van dr. Theodore von Karman.Precision and Microsystems EngineeringMechanical, Maritime and Materials Engineerin
G. Bos, Ch. Burnett, Th. Charmasson, P. Kunitzsch, F. Lelli, P. Lucentini, eds. Hermes Trismegisti astrologica et divinatoria (Hermes Latinus, IV.4)
No full textJuste David. G. Bos, Ch. Burnett, Th. Charmasson, P. Kunitzsch, F. Lelli, P. Lucentini, eds. Hermes Trismegisti astrologica et divinatoria (Hermes Latinus, IV.4). In: Revue belge de philologie et d'histoire, tome 83, fasc. 2, 2005. Histoire médiévale, moderne et contemporaine - Middeleeuwse, moderne en hedendaagse geschiedenis. pp. 571-573
G. Bos, Ch. Burnett, Th. Charmasson, P. Kunitzsch, F. Lelli, P. Lucentini, eds. Hermes Trismegisti astrologica et divinatoria (Hermes Latinus, IV.4)
No full textJuste David. G. Bos, Ch. Burnett, Th. Charmasson, P. Kunitzsch, F. Lelli, P. Lucentini, eds. Hermes Trismegisti astrologica et divinatoria (Hermes Latinus, IV.4). In: Revue belge de philologie et d'histoire, tome 83, fasc. 2, 2005. Histoire médiévale, moderne et contemporaine - Middeleeuwse, moderne en hedendaagse geschiedenis. pp. 571-573
Prof. Th. W. Adorno and the author Hans Erich Nossack.
No full textProf. Th. W. Adorno and the author Hans Erich Nossack at a reception of Insel Verlag, Buchmesse Frankfurt 1966LB
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
Get PDFThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
Th/U Microdistribution in Enstatite Meteorites
Get PDFWe report here our results to date for the mineralogical distribution of Th and U in the enstatite chondrites. By investigating the behavior of Th and U under the reducing conditions for which the enstatite meteorites formed, we hope to evaluate the suitability of these objectives for ^(244)Pu(_(1/2) = 82 m.y .) chronology, as well as gain insight into the origin of the E-chondrites. Induced fission tracks from a double irradiation have been used to map the distribution of Th and U in polished sections. The preliminary results are shown in Table I. The values are the mean contents of oldhamite (CaS) grains, and the uncertainties are the standard deviations from the mean.
In enstatite chondrites both Th and U are concentrated in oldhamite. For example, in a section of Daniel's Kuil at least 70% of the total Th and 90% of the U are found in oldhamite. In Khairpur, alabandite (MnS) was also found to contain U but at a lesser concentration (~20 ppb). The smaller oldhamite grain size in St. Mark's and Abee complicates their study; however, Th+U are also found to concentrate in oldhamite in these two meteorites but at a somewhat lower value than seen in the E-6's. The Th-U ratios in oldhamite determined so far appear relatively unfractionated from the typical value of ~4. The whole rock Th/U value forHvittis was reported to be 5.0 (Morgan and
Lovering, 1968) which agrees well with the oldhamite result. However, the whole rock Th/U for Khairpur of 2.5 (Morgan and Lovering, 1968) does not agree with the oldhamite value. This discrepancy will be investigated in an upcoming irradiation; in this irradiation we also hope to
complete the data set of Table 1, look at Th/U on a grain-by-brain basis and examine the U distribution
in a few enstatite achondrites (aubrites). But with the results to date, a good case can be made for a study of ^(244)Pu in the E-6 chondrites. The majority of Th and U is concentrated with little apparent fractionation in a single mineral, and the particular chemistry of oldhamite should enable a selective Pu-Xe measurement to be made
MODELLING THE ELECTRON WITH COSSERAT ELASTICITY
No full textInteractions between a finite number of bodies and the surrounding fluid, in a channel for instance, are investigated theoretically. In the planar model here the bodies or modelled grains are thin solid bodies free to move in a nearly parallel formation within a quasi-inviscid fluid. The investigation involves numerical and analytical studies and comparisons. The three main features that appear are a linear instability about a state of uniform motion, a clashing of the bodies (or of a body with a side wall) within a finite scaled time when nonlinear interaction takes effect, and a continuum-limit description of the body–fluid interaction holding for the case of many bodies
Dissipative Range Scaling of Higher Order Structure Functions for Velocity and Passive Scalars
No full textDifferently to Kolmogorov's second similarity hypothesis, we find that the 2n-th order velocity and scalar structure functions scale with n-th order moment of the energy dissipation and the scalar dissipation, respectively. The origins of this scaling are analyzed by the transport equations of the fourth order velocity and scalar increment moments and by direct numerical simulations
Experimental determination of U and Th partitioning between clinopyroxene and natural and synthetic basaltic liquid
No full textClinopyroxene-silicate liquid partition coefficients for U and Th have been determined by particle track radiography from 1 atm crystallization experiments at controlled fO_2. Two natural basaltic and one synthetic composition were studied at fO_2 values from the Ni—NiO oxygen buffer to 1 log unit more oxidizing than Fe—FeO (IW+ 1). Over the range of fO_2 values and compositions studied, D_U^(cpx/liq) = 0.0034–0.015,D_(Th)^(cpx/liq) = 0.008–0.036, and D_(Th)/D_U= 3.4–1.1. With decreasing fO_2, D_(Th)/D_U can decrease by up to a factor of 3 for a given composition, primarily from an increase in D_U^(cpx/liq), which we interpret as resulting from an increase in the proportion of tetravalent U in the system with decreasing fO_2. This demonstrates that crystal-liquid U—Th fractionation is fO_2 dependent and that U in terrestrial magmas is not entirely tetravalent. D_(Th)^(cpx/liq) appears to decrease in the two basalts at the lowest fO_2, possibly as a result of changes in composition with fO_2.
Our data show the sense of U—Th fractionation by clinopyroxene-liquid partitioning is consistent with previous experimental determinations, in that D_(Th)^(cpx)/D_U^(cpx)> 1 in all cases. This indicates that, during partial melting, the liquid will have a Th/U ratio less than the clinopyroxene in the source. The observed ^(238)—U^(230)Th disequilibrium in MORB requires that the partial melt should have a Th/U ratio greater than the bulk source, and, therefore, cannot result from clinopyroxene-liquid partitioning. Further, the magnitudes of the measured partition coefficients are too small to generate significant U—Th fractionation in either direction. Assuming that clinopyroxene contains the bulk of the U and Th in MORB source, our results indicate that ^(238)U—^(230)Th disequilibrium in MORB may not be caused by partial melting at all
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
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