14,205 research outputs found
The Way of the Servant Citizen: Building, Mindfulness and Reverence for Work (BMW): A Thematic Synthesis of Servant Attributes from Servant Leadership, Organizational Citizenship Behavior and the Servanthood of Jesus
The servant-first is central in writings on servant leadership and the biblical Jesus on becoming servants. A servant-first on its own volition seeks to serve, and to serve first the welfare of others before their own, and it does not necessarily hold a formal leadership position. The study introduces the term servant citizen to refer to one who is servant-first and an ordinary member of community. The study aimed to provide leaders, educators and trainers with teachable content that aids in the formation of servant citizens ─ more than nominal service-providers ─ from organization members. The study’s starting reference was servant leadership which, as related studies suggested, bore similarities with the servanthood of Jesus, and separate empirical studies associated with organization citizenship behavior. The researcher reviewed selected writings related to the three discrete concepts, gathered servant attributes and coded these, then distilled integrative themes. Preliminary analyses produced seven higher-level themes around the servant-first: (1) Developing character and self-concept; (2) Building capacity and readiness to serve; (3) Building people, relationships and sense of community; (4) Recognizing Thou in the other; (5) Adherence to laws, standards and norms; (6) Awareness of interdependencies and personal responsibilities; and (7) Getting the work done. The thematic analytical process, when saturated, yielded an ultimate synthesis: a triad of themes consisting of Building, Mindfulness and Reverence for Work (BMW). The study originates a new paradigm for servant citizenship as BMW simultaneously enacted. Abundant in meanings in either secular or Christian perspective considered independently, BMW provides a foundational content for teaching to develop individuals and institutions toward becoming servant citizens. The study contributes toward setting a future research agenda on servant citizenship ─ a concept heretofore non-extant in literature ─ and on BMW as a conceptual tool for weaving servanthood into the fabric of community, institutions and society
Observation of nonlinear dispersion relation and spatial statistics of wave turbulence on the surface of a fluid
We report experiments on gravity-capillary wave turbulence on the surface of
a fluid. The wave amplitudes are measured simultaneously in time and space
using an optical method. The full space-time power spectrum shows that the wave
energy is localized on several branches in the wave-vector-frequency space. The
number of branches depend on the power injected within the waves. The
measurement of the nonlinear dispersion relation is found to be well described
by a law suggesting that the energy transfer mechanisms involved in wave
turbulence are not only restricted to purely resonant interaction between
nonlinear waves. The power-law scaling of the spatial spectrum and the
probability distribution of the wave amplitudes at a given wave number are also
measured and compared to the theoretical predictions.Comment: accepted to Phys. Rev. Lett
Nonlinear dynamics of flexural wave turbulence
The Kolmogorov-Zakharov spectrum predicted by the Weak Turbulence Theory
remains elusive for wave turbulence of flexural waves at the surface of an thin
elastic plate. We report a direct measurement of the nonlinear timescale
related to energy transfer between waves. This time scale is extracted
from the space-time measurement of the deformation of the plate by studying the
temporal dynamics of wavelet coefficients of the turbulent field. The central
hypothesis of the theory is the time scale separation between dissipative time
scale, nonlinear time scale and the period of the wave (). We
observe that this scale separation is valid in our system. The discrete modes
due to the finite size effects are responsible for the disagreement between
observations and theory. A crossover from continuous weak turbulence and
discrete turbulence is observed when the nonlinear time scale is of the same
order of magnitude as the frequency separation of the discrete modes. The
Kolmogorov-Zakharov energy cascade is then strongly altered and is frozen
before reaching the dissipative regime expected in the theory.Comment: accepted for publication in Physical Review
Structural Order for One-Scale and Two-Scale Potentials
We perform molecular dynamics simulations to investigate the relationship
between structural order and water-like dynamic and thermodynamic anomalies in
spherically-symmetric potentials having either one or two characteristic length
scales. %The first potential has only one length scale which is the diameter of
the ramp %without the hard core, and the second potential has two length
scales: one is the %diameter of a ramp(softcore) and another one is the
diameter of a %hard core with a ratio of 1.76. Structural order is
characterized by translational and orientational order parameters. %analogous
to those used in previous cases for water and %silica.Only the two-scale ramp
potential exhibits properties %remarkably similar to those found for water and
silica regarding the %relationship between structural order, dynamic anomalies,
and thermodynamic %anomalies. We find that (i) dynamic and thermodynamic
anomalies exist for both one-scale and two-scale ramp potentials, and (ii)
water-like structural order anomalies exist only for the two-scale ramp
potential. Our findings suggest that the water-like relationship between
structural order and anomalies is related to the presence of two different
length scales in the potential.Comment: 12 pages, 5 figure
Expansion-maximization-compression algorithm with spherical harmonics for single particle imaging with X-ray lasers
In 3D single particle imaging with X-ray free-electron lasers, particle
orientation is not recorded during measurement but is instead recovered as a
necessary step in the reconstruction of a 3D image from the diffraction data.
Here we use harmonic analysis on the sphere to cleanly separate the angu- lar
and radial degrees of freedom of this problem, providing new opportunities to
efficiently use data and computational resources. We develop the
Expansion-Maximization-Compression algorithm into a shell-by-shell approach and
implement an angular bandwidth limit that can be gradually raised during the
reconstruction. We study the minimum number of patterns and minimum rotation
sampling required for a desired angular and radial resolution. These extensions
provide new av- enues to improve computational efficiency and speed of
convergence, which are critically important considering the very large datasets
expected from experiment
Getting a Grip on the Transverse Motion in a Zeeman Decelerator
Zeeman deceleration is an experimental technique in which inhomogeneous,
time-dependent magnetic fields generated inside an array of solenoid coils are
used to manipulate the velocity of a supersonic beam. A 12-stage Zeeman
decelerator has been built and characterized using hydrogen atoms as a test
system. The instrument has several original features including the possibility
to replace each deceleration coil individually. In this article, we give a
detailed description of the experimental setup, and illustrate its performance.
We demonstrate that the overall acceptance in a Zeeman decelerator can be
significantly increased with only minor changes to the setup itself. This is
achieved by applying a rather low, anti-parallel magnetic field in one of the
solenoid coils that forms a temporally varying quadrupole field, and improves
particle confinement in the transverse direction. The results are reproduced by
three-dimensional numerical particle trajectory simulations thus allowing for a
rigorous analysis of the experimental data. The findings suggest the use of a
modified coil configuration to improve transverse focusing during the
deceleration process.Comment: accepted by J. Chem. Phy
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