6,412 research outputs found
Biquadratic Filter Applications Using a Fully-Differential Active-Only Integrator
A new class of active filters, real active-only filters is described and possible implementation issues of these filters are discussed. To remedy these issues, a fully-differential active-only integrator block built around current controlled current conveyors is presented. The integration frequency of the proposed circuit is adjustable over a wide frequency range. As an application, a real active-only filter based on the classical two-integrator loop topology is presented and designed. The feasibility of this filter in a 0.35µm CMOS process is verified through SPECTRE simulation program in the CADENCE design tool
Invariance quantum group of the fermionic oscillator
The fermionic oscillator defined by the algebraic relations cc^*+c^*c=1 and
c^{2}=0 admits the homogeneous group O(2) as its invariance group. We show
that, the structure of the inhomogeneous invariance group of this oscillator is
a quantum group.Comment: 7 A4 page
Quantum Group Covariance and the Braided Structure of Deformed Oscillators
The connection between braided Hopf algebra structure and the quantum group
covariance of deformed oscillators is constructed explicitly. In this context
we provide deformations of the Hopf algebra of functions on SU(1,1). Quantum
subgroups and their representations are also discussed.Comment: 12 pages, to be published in JM
Effects of soil solarization and some amendments to control verticillium wilt in established olive orchards
The effects of solarization treatments, alone or with organic amendments and urea against verticillium wilt on olives were studied. Trials were carried out during the 2005 - 2007 seasons in an olive orchard consisting of 700 4 - 6 year old trees (cv Gemlik) in Germencik region of Aydin. Five treatments were carried out: Solarization (S), solarization + chicken manure (SCM) (1 kg m-2), solarization + olive processing waste (SOPW) (2 kg m-2), solarization + urea (SU) (100 g m-2) and an untreated control (C). Maximum soil temperatures reached in solarized plots were 54.7 and 43.9°C and in the non-solarized plots were 44.4 and 37.4°C at 5 and 20 cm soil depth, respectively. At the end of two years, the disease incidence and severity index decreased to zero in the treatments that included S. In the SCM treatment and in the control, the highest severity index (8.0) was recorded while the disease incidence slightly decreased from 66.7 to 44.4%. In SOPW plots, the disease severity index decreased to 2.0 and the disease incidence remained the same. In SU plots, the disease severity index decreased from 5.6 to 4.5 and disease incidence slightly decreased to 44.4%. As a result, the trees treated with solarization alone and solarization with olive processing waste showed an increased recovery and symptom remission compared with the initial disease severity and incidence.Key words: Olea europaea, Verticillium dahliae, amendments
Evanescent incompressible strips as origin of the observed Hall resistance overshoot
In this work we provide a systematic explanation to the unusual non-monotonic
behavior of the Hall resistance observed at two-dimensional electron systems.
We use a semi-analytical model based on the interaction theory of the integer
quantized Hall effect to investigate the existence of the anomalous, \emph{i.e}
overshoot, Hall resistance . The observation of the overshoot resistance
at low magnetic field edge of the plateaus is elucidated by means of
overlapping evanescent incompressible strips, formed due to strong magnetic
fields and interactions. Utilizing a self-consistent numerical scheme we also
show that, if the magnetic field is decreased the decreases to its
expected value. The effects of the sample width, temperature, disorder strength
and magnetic field on the overshoot peaks are investigated in detail. Based on
our findings, we predict a controllable procedure to manipulate the maxima of
the peaks, which can be tested experimentally. Our model does not depend on
specific and intrinsic properties of the material, provided that a single
particle gap exists.Comment: A theoretical follow-up paper of arXiv:1007.258
Compact Measurement Station for Low Energy Proton Beams
A compact, remote controlled, cost efficient diagnostic station has been
developed to measure the charge, the profile and the emittance for low energy
proton beams. It has been installed and tested in the proton beam line of the
Project Prometheus at SANAEM of the Turkish Atomic Energy Authority.Comment: 7 pages 2 column
Interaction Between Motor Domains Can Explain the Complex Dynamics of Heterodimeric Kinesins
Motor proteins are active enzyme molecules that play a crucial role in many
biological processes. They transform the chemical energy into the mechanical
work and move unidirectionally along rigid cytoskeleton filaments.
Single-molecule experiments suggest that motor proteins, consisting of two
motor domains, move in a hand-over-hand mechanism when each subunit changes
between trailing and leading positions in alternating steps, and these subunits
do not interact with each other. However, recent experiments on heterodimeric
kinesins suggest that the motion of motor domains is not independent, but
rather strongly coupled and coordinated, although the mechanism of these
interactions are not known. We propose a simple discrete stochastic model to
describe the dynamics of homodimeric and heterodimeric two-headed motor
proteins. It is argued that interactions between motor domains modify free
energy landscapes of each motor subunit, and motor proteins still move via the
hand-over-hand mechanism but with different transitions rates. Our calculations
of biophysical properties agree with experimental observations. Several ways to
test the theoretical model are proposed.Comment: To appear in New J. Phy
Generalized exclusion and Hopf algebras
We propose a generalized oscillator algebra at the roots of unity with
generalized exclusion and we investigate the braided Hopf structure. We find
that there are two solutions: these are the generalized exclusions of the
bosonic and fermionic types. We also discuss the covariance properties of these
oscillatorsComment: 10 pages, to appear in J. Phys.
Braided Oscillators
The braided Hopf algebra structure of the generalized oscillator is
investigated. Using the solutions two types of braided Fibonacci oscillators
are introduced. This leads to two types of braided Biedenharn-Macfarlane
oscillators.Comment: 12 pages, latex, some references added, published versio
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