4,887 research outputs found
The concept and social position of "managerial elite" in contemporary Kenya: with special reference to Africanization
The questions posed in this paper are: first, what is the nature of the 'managerial elite'; and second, how different are the characteristics of the "managerial elite" from the other societal groups in contemporary Kenya.
In answering these questions, I started with the premise that Africanization in contemporary Kenya can be best understood by a close examination of the "managerial elite", which becomes particularly salient during this process. Two aspects of Africanization noted include: Africanization of management and Africanization of ownership in trade and industry.
This paper is divided into two parts. The first part deals with the current theory and methodology on the "managerial elite" and provides an alternative way to conceptualize the "managerial elite". The second part deals with the historical aspect of Africanization and the social position of the "managerial elite" in contemporary Kenya
Optically detected magnetic resonance and thermal activation spectroscopy study of organic semiconductors
Organic electronic materials are a new class of emerging materials. Organic light emitting devices (OLEDs) are the most promising candidates for future flat panel display technologies. The photophysical characterization is the basic research step one must follow to understand this new class of materials and devices. The light emission properties are closely related to the transport properties of these materials. The objective of this dissertation is to probe the relation between transport and photophysical properties of organic semiconductors.;The transport characteristics were evaluated by using thermally stimulated current and thermally stimulated luminescence techniques. The photoluminescence detected magnetic resonance and photoluminescence quantum yield studies provide valuable photophysical information on this class of materials.;OLEDs are already in the market. However, detailed studies on the degradation mechanisms are still lacking. Since both optically detected magnetic resonance and thermal activation spectroscopy probe long-lived defect-related states in organic semiconductors, the combined study generates new insight on the OLED operation and degradation mechanisms
Clockwork graviton contributions to muon
The clockwork mechanism for gravity introduces a tower of massive graviton
modes, "clockwork gravitons," with a very compressed mass spectrum, whose
interaction strengths are much stronger than that of massless gravitons. In
this work, we compute the lowest order contributions of the clockwork gravitons
to the anomalous magnetic moment, , of muon in the context of extra
dimensional model with a five dimensional Planck mass, . We find that the
total contributions are rather insensitive to the detailed model parameters,
and determined mostly by the value of . In order to account for the
current muon anomaly, should be around , and the
size of the extra dimension has to be quite large, m.
For , the clockwork graviton contributions are too small
to explain the current muon anomaly. We also compare the clockwork
graviton contributions with other extra dimension models such as
Randall-Sundrum models or large extra dimension models. We find that the
leading contributions in the small curvature limit are universal, but the
cutoff-independent subleading contributions vary for different background
geometries and the clockwork geometry gives the smallest subleading
contributions.Comment: 14 pages, 4 figures: v3 minor corrections, to appear in PR
Gravitational waves from BH-NS binaries: Effective Fisher matrices and parameter estimation using higher harmonics
Inspiralling black hole-neutron star (BH-NS) binaries emit a complicated
gravitational wave signature, produced by multiple harmonics sourced by their
strong local gravitational field and further modulated by the orbital plane's
precession. Some features of this complex signal are easily accessible to
ground-based interferometers (e.g., the rate of change of frequency); others
less so (e.g., the polarization content); and others unavailable (e.g.,
features of the signal out of band). For this reason, an ambiguity function (a
diagnostic of dissimilarity) between two such signals varies on many parameter
scales and ranges. In this paper, we present a method for computing an
approximate, effective Fisher matrix from variations in the ambiguity function
on physically pertinent scales which depend on the relevant signal to noise
ratio. As a concrete example, we explore how higher harmonics improve parameter
measurement accuracy. As previous studies suggest, for our fiducial BH-NS
binaries and for plausible signal amplitudes, we see that higher harmonics at
best marginally improve our ability to measure parameters. For non-precessing
binaries, these Fisher matrices separate into intrinsic (mass, spin) and
extrinsic (geometrical) parameters; higher harmonics principally improve our
knowledge about the line of sight. For the precessing binaries, the extra
information provided by higher harmonics is distributed across several
parameters. We provide concrete estimates for measurement accuracy, using
coordinates adapted to the precession cone in the detector's sensitive band.Comment: 19 pages, 11 figure
Holographic Nuclear Matter in AdS/QCD
We study the physics with finite nuclear density in the framework of AdS/QCD
with holographic baryon field included. Based on a mean field type approach, we
introduce the nucleon density as a bi-fermion condensate of the lowest mode of
the baryon field and calculate the density dependence of the chiral condensate
and the nucleon mass. We observe that the chiral condensate as well as the mass
of nucleon decrease with increasing nuclear density. We also consider the mass
splitting of charged vector mesons in iso-spin asymmetric nuclear matter.Comment: 16 pages, 3 figures, two references are added, typo corrected,
section 3.3 remove
Military compensation alternatives for retention of officers in the Republic of Korea Army.
This research examines the current compensation policies of the Republic of Korea
Army with a view toward identifying and recommending the most appropriate compensation
policies for recruitment and retention of high quality officers.
The Republic of Korea Army is sustained largely by the loyalty and patriotism of
its members. However, several changes in the economic environment have tended to
make military service a less attractive career alternative for young men. Today, the
ROK Army faces several problems that are relative to inefficient manpower management.
Two separate surveys were utilized in an attempt to determine the attitudes of ROK
Army officers relative to compensation policies. The most significant finding of both
surveys is that certain changes in the compensation policies could have a positive influence
on the recruitment and retention of high quality officers. Specific policy changes
that are suggested by the surveys are improvement of pay compensation, focusing on
increasing initial pay of junior officers and a special allowance for typical military job
conditions, and improvement of current promotion and retirement systems for enhancing
job security.http://archive.org/details/militarycompensa00kimcMajor, Republic of Korea Arm
Ultraviolet photodepletion spectroscopy of dibenzo-18-crown-6-ether complexes with alkali metal cations
Ultraviolet photodepletion spectra of dibenzo-18-crown-6-ether complexes with alkali metal cations (M+-DB18C6, M = Cs, Rb, K, Na, and Li) were obtained in the gas phase using electrospray ionization quadrupole ion-trap reflectron time-of-flight mass spectrometry. The spectra exhibited a few distinct absorption bands in the wavenumber region of 35450−37800 cm^(−1). The lowest-energy band was tentatively assigned to be the origin of the S_0-S_1 transition, and the second band to a vibronic transition arising from the “benzene breathing” mode in conjunction with symmetric or asymmetric stretching vibration of the bonds between the metal cation and the oxygen atoms in DB18C6. The red shifts of the origin bands were observed in the spectra as the size of the metal cation in M^+-DB18C6 increased from Li^+ to Cs^+. We suggested that these red shifts arose mainly from the decrease in the binding energies of larger-sized metal cations to DB18C6 at the electronic ground state. These size effects of the metal cations on the geometric and electronic structures, and the binding properties of the complexes at the S_0 and S_1 states were further elucidated by theoretical calculations using density functional and time-dependent density functional theories
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