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Further development of a charged liquid colloid source for electrostatic propulsion Final report
Performance characteristics of charged liquid droplet electrostatic propulsion syste
Analisa dan Perancangan Jaringan Private Cloud Computing Berbasis Web Eyeos
— Private Cloud Computing is the model of Cloud Computing that provides a smaller scope to be able to provide certain services to specific users on an Enterprise scale companies. Expension of the company at Sutindo Raya Mulia, PT will add new employees and new computer devices and their software application that has a license. It will lead to the use of base servers load in the company. In the Cloud Computing system base servers, local no longer has to do all the heavy load when used for all resource servers cloud computing will be the one using openstack. Openstack is a cloud OS that manages the resource for function of compute, storage, network, and can be implemented for the characteristics of Infrastructure as a Service (IAAS). OpenStack can be built through the virtual server instance for eyeOS as one of cloud computing services Software As A Service (SAAS). Computer users simply install the browser on their computer can already implement in the company by using the eyeOS
Comment on ``Capacity of the Hopfield model''
In a recent paper ``The capacity of the Hopfield model, J. Feng and B.
Tirozzi claim to prove rigorous results on the storage capacity that are in
conflict with the predictions of the replica approach. We show that their
results are in error and that their approach, even when the worst mistakes are
corrected, is not giving any mathematically rigorous results.Comment: 4pp, Plain Te
The structure of one-relator relative presentations and their centres
Suppose that G is a nontrivial torsion-free group and w is a word in the
alphabet G\cup\{x_1^{\pm1},...,x_n^{\pm1}\} such that the word w' obtained from
w by erasing all letters belonging to G is not a proper power in the free group
F(x_1,...,x_n). We show how to reduce the study of the relative presentation
\^G= to the case n=1. It turns out that an
"n-variable" group \^G can be constructed from similar "one-variable" groups
using an explicit construction similar to wreath product. As an illustration,
we prove that, for n>1, the centre of \^G is always trivial. For n=1, the
centre of \^G is also almost always trivial; there are several exceptions, and
all of them are known.Comment: 15 pages. A Russian version of this paper is at
http://mech.math.msu.su/department/algebra/staff/klyachko/papers.htm . V4:
the intoduction is rewritten; Section 1 is extended; a short introduction to
Secton 5 is added; some misprints are corrected and some cosmetic
improvements are mad
Comment on ``High Temperature Fermion Propagator -- Resummation and Gauge Dependence of the Damping Rate''
Baier et al. have reported the damping rate of long-wavelength fermionic
excitations in high-temperature QED and QCD to be gauge-fixing-dependent even
within the resummation scheme due to Braaten and Pisarski. It is shown that
this problem is caused by the singular nature of the on-shell expansion of the
fermion self-energy in the infra-red. Its regularization reveals that the
alleged gauge dependence pertains to the residue rather than the pole of the
fermion propagator, so that in particular the damping constant comes out
gauge-independent, as it should.Comment: 5 page
Measurements and Simulation Studies of Piezoceramics for Acoustic Particle Detection
Calibration sources are an indispensable tool for all detectors. In acoustic
particle detection the goal of a calibration source is to mimic neutrino
signatures as expected from hadronic cascades. A simple and promising method
for the emulation of neutrino signals are piezo ceramics. We will present
results of measruements and simulations on these piezo ceramics.Comment: 5 pages, 5 figure
Gauge theory, topological strings, and S-duality
We offer a derivation of the duality between the topological U(1) gauge
theory on a Calabi-Yau 3-fold and the topological A-model on the same manifold.
This duality was conjectured recently by Iqbal, Nekrasov, Okounkov, and Vafa.
We deduce it from the S-duality of the IIB superstring. We also argue that the
mirror version of this duality relates the topological B-model on a Calabi-Yau
3-fold and a topological sector of the Type IIA Little String Theory on the
same manifold.Comment: 9 pages, latex. v2: a footnote has been added. The footnote corrects
an inaccuracy in the original argument; the results are unchanged. v3:
exposition improve
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