Our main goal in this research is to find the conditions which make
the a - small submodules are equivalent with small submodules and
so s- large submodules with large submodules, then find the relatio
-nship between the radical of module and the a - small submodules.
The concept of Baer modules has grate effect in Theory
rings and modules, because the relation between this concepts with
hereditary and semi-hereditary rings and its study.
It's considered that، the ring of linear operator of vector
space and stilled as a source of many mathematicians in general and
algebreians particularly in introducing a new concepts in algebra
and ring theory. In this subject I. Kaplansky proved
the following
theorem: "The ring of linear operators of finite dimension vector
space is regular".
The object of this paper is studying of ring of linear operator
of vector space in abstract algebra point of view.
In the following study we make a simulation of an independent
photovoltaic system connected to an (ohm
- unit of electrical resistance) load which consists of the following
parts:
(Photovoltaic Module - Converter dc- dc - Control system to
track
ing the maximum power point via MATLAB & Simulink
program)
Taking advantage of equations of Photovoltaic Module we chart
the graph and simulate curves of the Module.
We also simulate the converter –type Cuk- which gives higher or
lower voltage than input voltage but with reversed polarity.
We also make a comparison between the two systems tracking:
the first tracker is a traditional one and the second one is a system
in which it uses a fuzzy logic tracker.
The results of the comparison shows different capacities taking into
consideration the varieties of weather conditions of regular solar
radiation as well as the partial shadow.
Such results showed that fuzzy logic has got more capability to
harmonize with all conditions especially in cases of low solar
radiation and partial shadow.
In this research, we study right (left) dual semipotent rings as right
(left) rings, and dual semipotent modules as modules.
Regular modules
الحلقة اليمينية (اليسارية) المرافقة لحلقة شبه جامدة
حلقة يمينية (يسارية)
المودول المرافق لمودول شبه جامد
حلقة يمينية (يسارية) رئيسية
right (left) dual semipotent rings
right (left) rings
dual semipotent modules
principal right (left) rings
retractable module
epi-retractable module
rickart modules
Injective module
المزيد..
Hydrogen production, vector of energy, by water electrolysis can be economically
viable by using electrical energy from renewable sources such as photovoltaic solar
energy. In this research was the study of solar hydrogen production using electroly
ser
based on polymeric exchange membrane electrolysis technology manufactured locally at
the Faculty of Technical Engineering in Tartous. The experimental studies were achieved
in two different methods: the first, direct coupling to the hydrogen electrolyser with PV
module. The second method, designed PV-electrolyzer system consists of the following
components: PV module, a maximum power point tracker (MPPT), A DC-DC converter,
which is used to operate the system at the maximum power of the PV system at all times
and to supply the necessary DC current to the electrolyzer, and tank hydrogen. The results
showed that the second method more effective and highly efficient when compared with
the first method because of the change in the intensity of solar radiation during the day.
Also, results show that some additives such as (KOH) play an important role in enhancing
the ionization process of the electrolyte liquid and improve process flow.
This research presents a mathematic module for stepper motor in Matlab program
through the equations that describe the motor transfer function. It illustrates the primary
characters of the open loop for the designed module, then it offers PID contr
oller design
for controlling the motor speed.
In addition, we can use the fuzzy logic and its applications in order to design a speed
fuzzy controller. Finally, we make a comparison between the fuzzy and PID controller in
control performance and response time.
The objective of this work is to study and design a module of super capacitors for recovering the braking
energy in trolleybuses. The module of super capacitors is charged and discharged by Buck-Boost
converter that is reversible in current. The co
ntrol and the smoothing elements of the converter are
designed with taking into account the non-linear nature of super capacitors. To recover quickly the
braking energy, the module is charged with constant current, while the discharging is done with constant
voltage on the DC link of trolleybus. The module of super capacitors in its different operations (starting
up, powering auxiliary equipments, braking) is simulated in the SIMPLORER environment. As a result,
the different operating values (as voltage, current and temperature) are determined for the elements of
the studied module (diodes, IGBTs, capacitor, super capacitors). Finally, the failure rate and the
reliability of the module elements are estimated depending on the different operating factors. The module
faults is analyzed.
The objective of this paper is to continue our study for a right 1 I - rings and
to generalize the concept of 1 I - rings to modules. We call a ring R a right
1 I - ring if every right annihilator for any element of R contains a nonzero
idempotent
.
The objectiv of this paper is to study the relationship between certain ring R
and endomorphism rings of free modules over R. Specifically, the basic problem is
to describe ring R, which for it endomorphism ring of all free R-module, is a
generali
zed right Baer ring, right I1-ring.
Call a ring R is a generalized right Baer ring if any right annihilator contains
a non-zero idempotent. We call a ring R is right I1-ring if the right annihilator of
any element of R contains a non-zero idempotent. This text is showing that each
right ideal of a ring R contains a projective right ideal if the endomorphism ring
of any free R-module is a right I1-ring. And shown over a ring R, the
endomorphism ring of any free R-module is a generalized right Baer ring if and
only if endomorphism ring of any free R-module is an I1-ring.
