9,648 research outputs found
Jacob Viner’s Reminiscences from the New Deal (February 11, 1953)
Get PDFThis paper presents and reproduces an unpublished oral history interview given by Jacob Viner in 1953. The interview released by Viner for the Columbia Oral History Project gives us a valuable opportunity to throw light on his advisory activity during the New Deal Era. In our introduction we attempt to make a critical appraisal of Viner's reminiscences and to state the contribution they can provide to our general knowledge of the period. In addition, we also attempt to find out some biographical and interpretative elements useful to understand Viner’s own vision and his contribution to important economic policy processes during the New Deal.
The presence and absence of god in the Jacob narrative
Get PDFThis thesis explores the theological complexity of the Jacob narrative. In particular this is centred upon the paradox of divine presence and absence, and the contrast of the human and the divine. In the first part, an investigation is made of three key episodes which contain an encounter with the divine: the opening oracle (25:19ff), Bethel (28:10-22) and Peniel (32:23-33). It is concluded that the first passage is constructed as an introduction, making explicit the theme of the presence of God in the Jacob story, but also introducing the human side of the paradox. Bethel and Peniel are based on older pre-Yahwistic traditions, now shaped and incorporated into the story of Jacob to throw a theological perspective over the wider plot. The second part consists of a reading of the wider Jacob story, with particular attention to the theme of divine presence and absence and the interaction of the human and the divine. It is argued that even the most human of stories betray a theological interest and contribute to the overall paradox, but also that there are several indications of the presence of God. In the conclusion, it is noted that behind the present unity of the Jacob story there is evidence of earlier traditions, a growing together of material, and supplements offering new perspectives. It is also concluded that a close reading of the final text and a historical-critical appreciation need not be mutually exclusive, and that a cautious use of critical insights has thrown light upon the final form. Finally, it is argued that the theme of the presence and absence of God offers a way of reading the Jacob story in a theological way, that does most justice to its historical depth, final form, and canonical status
Accn2505_005_033
No full textBlack-and-white photograph of Lewis K. Leedy (1807-1896), second husband of Delilah, daughter of Jacob Myers. Probably from the 1870s
Segregation and the Black-White Test Score Gap
Get PDFThe mid-1980s witnessed breaks in two important trends related to race and schooling. School segregation, which had been declining, began a period of relative stasis. Black-white test score gaps, which had also been declining, also stagnated. The notion that these two phenomena may be related is also supported by basic cross-sectional evidence. We review existing literature on the relationship between neighborhood- and school-level segregation and the test score gap. Several recent studies point to a statistically significant causal relationship between school segregation and the test score gap, though in many cases the magnitude of the relationship is small in economic terms. Experimental studies, as well as methodologically convincing non-experimental studies, suggest that there is little if any causal role for neighborhood segregation operating through a mechanism other than school segregation.
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Jacob Kollens Thesis_Experiences in Implamenting the White Method.pdf
No full textEvapotranspiration (ET) is the process by which water is transferred from land to the atmosphere. ET is the second most important component of a hydrologic budget and remains difficult to estimate. The primary objective of this project was to determine the limitations of estimating ET from water table elevation fluctuations analyzed using the White Method (White, 1932). Secondary objectives include: determining if specific yield is a function of water table depth, investigating the effect of hysteresis on water table fluctuation shape, estimating groundwater recharge rate, and using vegetation data to gain clues regarding spatiotemporal water availability.
They are 5 major results from this investigation. Nachabe's modified soil moisture balance (Nachabe et al. 2005) outperformed the classical White Method (White, 1932) in ability to estimate a daily rate of evapotranspiration. Specific yield is not a constant and changes with water table depth below ground surface level. Hysteresis can explain the break in slope in water table rise observed during the night of many records of water table fluctuations. The White Method is more suitable to estimate groundwater upwelling rather than evapotranspiration. Finally, vegetation sampling can provide clues to intra-seasonal and inter-seasonal water availability across a site
An electrical-level superposed-edge approach to statistical serial link simulation
No full textrute-force simulation approaches to estimating serial-link bit-error rates (BERs) become computationally intractable for the case when BERs are low and the interconnect electrical response is slow enough to generate intersymbol interference that spans dozens of bit periods. Electrical-level statistical simulation approaches based on superposing pulse responses were developed to address this problem, but such pulse-based methods have difficulty analyzing jitter and rise/fall asymmetry. In this paper we present a superposing-edge approach for statistical simulation, as edge-based methods handle rise/fall asymmetry and jitter in straightforward way. We also resolve a key problem in using edge-based approaches, that edges are always correlated, by deriving an efficient inductive approach for propagating the edge correlations. Examples are presented demonstrating the edge-based method's accuracy and effectiveness in analyzing combinations of uniform, Gaussian, and periodic distributed random jitter
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
An improved thick-film piezoelectric material by powder blending and enhanced processing parameters
No full textThis paper details improvements of the d33 coefficient for thick-film lead zirconate titanate (PZT) layers. In particular, the effect of blending ball and attritor milled powders has been investigated. Mathematical modeling of the film structure has produced initial experimental values for powder combination percentages. A range of paste formulations between 8:1 and 2:1 ball to attritor milled PZT powders by weight have been mixed into a screen-printable paste. Each paste contains 10% by weight of lead borosilicate glass and an appropriate quantity of solvent to formulate a screen printable thixotropic paste. A d33 of 63.5 pC/N was obtained with a combination of 4:1 ball milled to attritor milled powder by weight. The improved paste combines the high d33 values of ball and the consistency of attritor milled powder. The measured d33 coefficient was further improved to 131 pC/N by increasing the furnace firing pro-file to 100
Non-canonical activation of Akt in serum-stimulated fibroblasts, revealed by comparative modeling of pathway dynamics
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Hot DAVs: a probable new class of pulsating white dwarf stars
Get PDFWe have discovered a pulsating DA white dwarf at the lower end of the temperature range 45 000–30 000 K where a few helium atmosphere white dwarfs are known. There are now three such pulsators known, suggesting that a new class of theoretically predicted pulsating white dwarf stars exists. We name them the hot DAV stars. From high-speed photometric observations with the ULTRACAM photometer on the 4.2-m William Herschel Telescope, we show that the hydrogen atmosphere white dwarf star WD1017−138 pulsates in at least one mode with a frequency of 1.62 mHz (a period of 624 s). The amplitude of that mode was near 1 mmag at a 10σ confidence level on one night of observation and an 8.4σ confidence level on a second night. The combined data have a confidence level of 11.8σ. This supports the two other detections of hot DAV stars previously reported. From three Very Large Telescope Ultraviolet and Visual Echelle Spectrograph spectra we confirm also that WD1017−138 is a hydrogen atmosphere white dwarf with no trace of helium or metals with Teff = 32 600 K, log g = 7.8 (cgs) and M = 0.55 M⊙. The existence of pulsations in these DA white dwarfs at the cool edge of the 45 000–30 000 K temperature range supports the thin hydrogen layer model for the deficit of helium atmosphere white dwarfs in this range. DA white dwarfs with thick hydrogen layers do not have the superadiabatic, chemically inhomogeneous (μ-gradient) zone that drives pulsation in this temperature range. The potential for higher amplitude hot DAV stars exists; their discovery would open the possibility of a direct test of the explanation for the deficit of helium atmosphere white dwarfs at these temperatures by asteroseismic probing of the atmospheric layers of the hot DAV stars. A search for pulsation in a further 22 candidates with ULTRACAM on the European Southern Observatory New Technology Telescope gave null results for pulsation at precisions in the range 0.5–3 mmag, suggesting that the pulsation amplitudes in such stars are relatively low, hence near the detection limit with the ground-based telescopes used in the survey
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