|
Keywords: modeling, simulation, relaxation time, relaxation
process, fines particles, dipolar interaction
Mihaela Osaci
: The Optimization of the 3D Simulation Model of the Magnetic
Relaxation Time for a Nanoparticles System With Dipolar
Interaction
Metalurgia
International (vol.IX), no.5, 2004, p.3
In recent year,
single-domain ultra fine ferromagnetic particles have received considerable
interest, both due to their important technological applications and their
rich experimental behaviour.
This work
presents an optimisation study for tree-dimensional
simulation model of the magnetic relaxation process for magnetic approximate
spherical nanoparticles system. Considering that
the particles have a uniaxial anisotropy and are
randomized arranged in a specified volume, the studies consider two cases:
week and strong dipolar magnetic interaction between particles.
D.C.: 669.162.28
Keywords: PSCAD-EMTDC, electric arc, simulation
Manuela
Pănoiu, Caius Pănoiu, Mihaela Osaci: Simulations results on the reactive power Cmpensation Process on electric arc furnace using PSCAD-EMTDC
Metalurgia
International (vol.IX), no.5, 2004, p. 10
It is very well
known that electric arc furnace as a three-phase charge represent one of the most
important generator of harmonic currents, reactive power and unbalanced
conditions in electrical power systems. To study how the reactive power
compensation installation works it is need to know both the values of
electrical parameters of arc furnace electrical installation as well as how
can be modeled the electric arc.
The electric
arc is a non-linear element of a circuit. In these conditions to simulate the
electrical installations functioning is necessary to use highly performing
models of the electric arc. There are many models of electric arc in
simulations presented in literature but in simulations results using these
models the authors consider that three-phase electric arc is a balanced
charge.
This paper
presents the reactive power values obtained by simulation for different steps
of the reactive power compensation installation under the hypothesis that
harmonics filters are connected. The simulations are realized using
PSCAD/EMTDC simulation program. At the end are presented the conclusions referring
to the matching of the simulations results to the computed values.
Keywords: nanoparticles, complex magnetic susceptibilities, simulation
model, Q-metrical measuring method
Mihaela Osaci,
Ionel Muscalagiu: About Behavior of the Ferrite Nanoparticles in Radio Frequency Magnetic Fields
Metalurgia
International (vol.IX), no.5, 2004, p. 18
This work
presents an experimental verification of the simulation model for behavior of
the ferrite nanoparticles in radio frequency
magnetic field from previous study. The experimental
|
measured nanoparticles system is the NiZn
mixed ferrite system.
D.C.:65.011.56 (62-52)
Aurel Ciurea,
Marian Bordei: Robot type Manipulator
for Serving of a Bolts Hardening System Outline
Metalurgia
International (vol.IX), no.5, 2004, p. 22
The paper
work refers to a flexible manufacturing cell where the bolts hardening system
within a relatively wide range of dimensions is completely automatic. For
this purpose, a robot type manipulator serving an induction hardening system
is used.
The
manufacturing cell consists of:
- a warehouse where the bolts to be hardened are located on
a slightly inclined plane, so that the bolts to successively come by rolling
to the place where the are taken over
by manipulator.
- a robot type
manipulator for handling the parts from the warehouse for bolts to be
hardened, on the hardening system and further into the hardened parts
container.
- an induction hardening system for axles or bolts.
D.C.: 621.771
Keyworks: plastic deformation; mill rolls; hot milling
Vasile
Caţarschi: Manufacturing Engineering of the Forged Mill Rolls for Rolled
Products from S.C. FORTUS S.A.
Iaşi
Metalurgia
International (vol.IX), no.5, 2004, p. 27
During the
rolling process, the rolls work in a very heavy duty because they take over
high local and total pressures, together with the sliding of the material on
the contact surface. Besides, rather frequently, the rolling process is
developing in conditions of high temperature of the working surface and this
temperature can vary suddenly.
For the above-mentioned reasons, when
operating mill rolls, it is of great importance not only the high mechanical
strength but also their capacity to oppose to various types of wear. The roll
surface is worn out during operation. Turning and grinding can restore this
surface, such operation causing the step-by-step reduction of the working
diameter. For hot milling of plate and profiles steel cast and forged rolls
are largely used as well as hard shell cast iron rolls.
In this paper it is presented
manufacturing engineering of the forged mill rolls for rolled products.
D.C.: 621.746
Nicolae Rusu,
Carmen Hărău, Ioan Ilca,
Stela Anghel : Avoiding Strain on Continuous Casting by Correlation of the Work Rate
Metalurgia
International (vol.IX), no.5, 2004, p.35
The paper
introduces a method easily applicable in current practice, based on knowing
the technological parameters of the rolling process, meant to synchronize the
work rate among the continuous rolling stands and the rolled product, taking
into consideration its advance.
This is a
means of avoiding supplementary stretching or compression strains in the
rolling process.
ERMINA ţAPU, NICOLETA LILIANA FRăţILă:
The Influence of the Material Properties Over the Products Aesthetics
Metalurgia
International (vol.IX), no.5, 2004, p.39
The present article describes a study that has been developed to determine the influence of material properties over the design and aesthetic characteristics of industrial products. The crystals structure defects have an important part to determine many physical-mechanical properties of solid bodies, and consequently, knowing them is essential when choosing a material.
|
