97,846 research outputs found
Joshua Davis: Author of Spare Parts
No full textCitation: K-State First (2016). Joshua Davis: Author of Spare Parts [Flier]. Manhattan, Kansas: K-State First.Flyer advertising Joshua Davis's author talk at Kansas State University
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
k-anonymity
No full textTo protect respondents’ identity when releasing microdata, data holders often
remove or encrypt explicit identifiers, such as names and social security numbers.
De-identifying data, however, provide no guarantee of anonymity. Released information often contains other data, such as race, birth date, sex, and ZIP code, that can be linked to publicly available information to re-identify respondents and to infer information that was not intended for release.
One of the emerging concept in microdata protection is k-anonymity, which has been recently proposed as a property that captures the protection of a microdata table with respect to possible re-identification of the respondents
to which the data refer. k-anonymity demands that every tuple in the microdata table released be indistinguishably related to no fewer than k respondents. One of the interesting aspect of k-anonymity is its association with protection techniques that preserve the truthfulness of the data. In
this chapter we discuss the concept of k-anonymity, from its original proposal
illustrating its enforcement via generalization and suppression. We then survey and discuss research results on k-anonymity in particular with respect to
algorithms for its enforcement. We also discuss different ways in which generalization and suppressions can be applied to satisfy k- anonymity and, based
on them, introduce a taxonomy of k-anonymity solutions
Momentum distribution and two-body short range correlations in 16O(e,e'p)
No full textTo be published in EIPC Proceedings 1989. Presented by G.P. Capitani at "Topical Workshop . ."SIGLEITItal
The peculiar crystal-chemistry of phlogopite from metasomatized peridotites: evidence from laboratory and nature
No full textExperimental petrology suggested that phlogopite has a peculiar mineral chemistry at high pressure: excess of Si coupled with a decrease in IVAl and deficiency in K+Na. This K-edenite exchange, □XIISi(K+Na)-1Al-1, where □XII is a vacancy in the interlayer, should imply that phlogopites incorporate significant amount of talc component. At high pressure conditions, however, in a fluid saturated system, a talc component might translate into a 10 Å phase component, being the latter phase the product of the reaction talc + H2O = 10 Å phase occurring at P = 4-5 GPa and at T = 600-700 °C. We aim to study the structure of natural and synthetic phlogopites showing this peculiar mineral chemistry. Samples were analysed by single-crystal X-ray diffraction, powder X-ray diffraction with full profile fitting, EMP, SIMS, TEM and Mössbauer spectroscopy. The natural samples were recovered from spinel and garnet wedge peridotites of the Ulten Zone Eastern Italian Alps, (Italy), whereas synthetic ones were obtained from high pressure synthesis in a K-doped lherzolite system. The single crystal X-ray refinements of natural phlogopites, together with the EMP analysis, showed two coupled substitutions: Tschermak (Si + Mg = IVAl + VIAl) and talc exchanges (□ + Si = K + Al), with no octahedral vacancies. The Rietveld refinement of the synthetic samples confirmed the ipersilicic character and K deficiency found with EMPA and SIMS analysis. The c lattice parameter of both synthetic and natural phlogopites positively correlates with the increase of vacancies at the interlayer site, pointing toward the c lattice parameter of the 10Å phase. The tetrahedral α rotation angle of natural phlogopites was about 9°, lower than that expected by Tschermak substitution. The present data indicate that the 10 Å phase component, instead of the talc component, stabilizes the phlogopite structure by reducing the α rotation under high pressure condition. This increases the pressure conditions needed to reach the upper limit value for the tetrahedral rotation
Origin and pathways of pro- and retrograde fluids, PTt paths and fluid-mineral equilibria from Alpine veins of the Central Alps : case studies of the Fibbia and Amsteg areas
No full textIn order to constrain the conditions of and processes related to vein formation and the
origins of mineralising fluids, field work, multiple geochemical methods applied to whole
rocks, minerals, and fluid inclusions, as well as thermodynamic modeling on these veinwall
rock systems have been carried out. The focus of this study was on vein and fissure
systems from two particular areas in the external parts of the Central Alps: the Fibbia area
in the southern Gotthard massif and the NEAT-Cable tunnel (Amsteg) in the northern
Aar massif. The observations and results are divided into three chapters.
The first chapter focusses on fluid-rock interactions around five vein types found in the
Fibbia area. Fluid-rock interactions were not visible and measurable in the case of V1a,b
and V5 veins, very minor for V3-V4 veins, and significant for V2 veins. The host rock and
mineral alteration near V2 is documented geochemically and compared with the geochemistry
of the different fluid populations, that were measured with LA-ICPMS and crush
leach analyses. The host rock near V2 veins indicates silica depletion and a relative enrichment
in K, Na, and Al. During the early stages of V2 opening, biotite and quartz
were leached from the host rock, while during later stages pores formed by earlier leaching
were refilled with biotite, albite, quartz, albite, muscovite, and with hematite and chlorite
during V3 and V4 vein formation. The alteration is mainly iso-chemical and shows a
segregation of material from the host rock to the vein. Nevertheless, minor external input
of some components (CO2, SiO2) may also have occurred. The fluids in these five veins
contain Na, K, Cl and minor Ca, Li, Mg, Fe, Cu, Rb, Sr, Pb, Ba, Cs, Zn, As, Br, and
SO2− 4 . Thermodynamic speciation calculations on the Na and K concentrations and ratios
in the fluids in equilibrium with a rock of granitic composition using a modified version
of THERIAK yield an approximate comparison to the measured fluid chemistries up to 1
molal Cl concentrations. The Na-K concentrations and ratios are not related to the total
anion concentration in the fluid. Fe-Mg-Ca concentrations in the modelled fluids are lower
than the analysed concentrations. This is mainly related to possible over-saturation of
Ca, Fe, Mg or to the lack of Ca, Fe, and Mg species in the database used.
The second chapter concerns the origins and flow paths of pro- and retrograde fluids in
the Fibbia area. V1a veins are pre-Alpine and V1b veins are prograde Alpine older than
37 Ma. V2-V5 veins formed between 20–13 Ma during Alpine retrograde metamorphic
conditions at temperatures from 420 to ≤ 200 ◦C and fluid pressures of 4 to ≤ 1 kbar.
Vein formation was characterized by varying tectonic conditions: unknown for V1a veins
and related to S1 formation for V1b veins, V2 formed during near-vertical extension and
V3-V5 formed during horizontal NE-SW extension. The V1 and V2 vein fluids contain up
to 7 mol% CO2 and 1 mol% NaCl. Later retrograde fluids from V3 and V4 veins are CO2
depleted and contain up to 2 mol% NaCl. V5 fluids are CO2 free and have a salinity lower
than 0.6 mol%. Hydrogen isotope measurements on fluids and minerals from V1-V4 veins
give evidence supporting a metamorphic origin. In contrast, for V5 veins hydrogen isotope
analyses support a meteoric origin. δD values less than −130 for V5 fluids and hydrous
minerals indicate that the meteoric fluids originated from a high altitude mountainous
area ( ≥ 3000m) of 15–10 My. Stable isotope measurements on minerals from host-rock
and veins and fluid inclusions shows that the scales of fluid flow are constrained to 1–10
m for V1b-V4 and were ≥ 8 km for V5, as the overburden during meteoric fluid flow in V5
was at least 8 km. Middle Miocene orogen-parallel extension was important for facilitating
localized meteoric fluid ciruclation along large-scale V5 fracture systems. Before V5 veins
formed, meteoric fluid influence was not observable in the studied areas.
The third chapter focusses on Alpine fissures from the Amsteg area (northern Aar massif)
and the differences in vein formation that are observed between V2 veins from the
Fibbia area and the Amsteg area. The Alpine fissures in the Amsteg area formed between
19–14 Ma at temperatures between 350–250 ◦C and pressures between 3.5–2.5 kbar
by sub-vertical extension and SE-NW compression, with little fluid-rock interaction. All
three fluid populations are of the H2O-NaCl type and contain up to 5 wt% NaCl eq. The
mineralisation is similar to the V2 veins from the Fibbia area, although pyrrhotine and
pyrite are common accessory minerals. Small amounts of REE-containing carbonates were
observed as well. Hydrogen and oxygen stable isotope measurements on fluid inclusions
and vein minerals (quartz) indicate that the mineralising fluids were mainly metamorphic.
The change in mineralisation in the veins as well as slight salinity decreases of later
vein forming fluids suggests that fluids from lower temperatures flowed through the veins
systems
K-anonymous data mining : a survey
No full textData mining technology has attracted significant interest as a means of identifying patterns and trends from large collections of data. It is however evident that the collection and analysis of data that include personal information may violate the privacy of the individuals to whom information refers. Privacy protection in data mining is then becoming a crucial issue that has captured the attention of many researchers. In this chapter, we first describe the concept of k-anonymity and illustrate different approaches for its enforcement. We then discuss how the privacy requirements characterized by k-anonymity can be violated in data mining and introduce possible approaches to ensure the satisfaction of k-anonymity in data mining
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
Increase in nuclear phosphatidylinositol 3-kinase activity and phosphatidylinositol (3,4,5) trisphosphate synthesis precede PKC-zeta translocation to the nucleus of NGF-treated PC12 cells.
No full textWe and others have previously demonstrated the existence of an autonomous nuclear polyphosphoinositide cycle that generates second messengers such as diacylglycerol (DAG), capable of attracting to the nucleus specific protein kinase C (PKC) isoforms (Neri et al. (1998) J. Biol. Chem. 273, 29738-29744). Recently, however, nuclei have also been shown to contain the enzymes responsible for the synthesis of the non-canonical 3-phosphorylated inositides. To clarify a possible role of this peculiar class of inositol lipids we have examined the question of whether nerve growth factor (NGF) induces PKC-zeta nuclear translocation in PC12 cells and whether this translocation is dependent on nuclear phosphatidylinositol 3-kinase (PI 3-K) activity and its product, phosphatidylinositol 3,4, 5-trisphosphate [PtdIns(3,4,5)P(3)]. NGF increased both the amount and the enzyme activity of immunoprecipitable PI 3-K in PC12 cell nuclei. Activation of the enzyme, but not its translocation, was blocked by PI 3-K inhibitors wortmannin and LY294002. Treatment of PC12 cells for 9 min with NGF led to an increase in the nuclear levels of PtdIns(3,4,5)P(3). Maximal translocation of PKC-zeta from the cytoplasm to the nucleus (as evaluated by immunoblotting, enzyme activity, and confocal microscopy) occurred after 12 min of exposure to NGF and was completely abrogated by either wortmannin or LY294002. In contrast, these two inhibitors did not block nuclear translocation of the conventional, DAG-sensitive, PKC-alpha. On the other hand, the specific phosphatidylinositol phospholipase C inhibitor, 1-O-octadeyl-2-O-methyl-sn-glycero-3-phosphocholine, was unable to abrogate nuclear translocation of the DAG-insensitive PKC-zeta. These data suggest that a nuclear increase in PI 3-K activity and PtdIns(3,4,5)P(3) production are necessary for the subsequent nuclear translocation of PKC-zeta. Furthermore, they point to the likelihood that PKC-zeta is a putative nuclear downstream target of PI 3-K during NGF-promoted neural differentiation.-Neri, L. M., Martelli, A. M., Borgatti, P., Colamussi, M. L., Marchisio, M., Capitani, S. Increase in nuclear phosphatidylinositol 3-kinase activity and phosphatidylinositol (3,4, 5) trisphosphate synthesis precede PKC-zeta translocation to the nucleus of NGF-treated PC12 cells
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