Direct Energy Conversions...
Magnetohydrodymamic Power Generator
تقی
ابتکار
author
text
article
1974
per
Magnetohydrodynamic (MHD) Convertor IS based on the following
Principle; Assume a conductor with velocity v moves through a magnetic field
of magnetic induction B then according to OHM'S law an electric field v B
IS induced in MHD the Conductor is a seeded ionize Gas (Fig 1) .
Comparing with conventional turbogenerator MHD power generation has
two advantages:
1 ). In MHD there are no moving parts, thus the lubrication and
mechanical stress Problems IS alleviated. In (MHD) working fluids may work
at higho temperature.
2). The higer temperator of working fluids will resulte higher thermal.
efficiency In MHD Generator, high temperatur (30000K) is required to
ioniz the working gas this makes it difficult to find reliable material for electodes
and isolator. MHD. Genorator may be combined with Conventional Power Plant
to increase thermal efficiency up to 55%
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26630_bdb03172c2144223782ab09824ad3edf.pdf
A Resistance law for Extreme Natural Roughness in Pressure
Pipes Based On Statistical Methods
محمد تقی
منزوی
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26631_b073b17c559c023fc7f219b4fb77c363.pdf
Certaines causes de la mise horsservice des constructions
مهدی
قالیبافیان
author
text
article
1974
per
AssistantProfesseur a la Faculte Technique de Teheran
Directeur du Laboratoire d'Essais des Materiaux
L'etude des desordres survenus dans les constructions et des cas de mise
horsservice des batiments, constitue 1'un des moyens les plus ef'f'icaces de perfectionner
« 1'Art de Construire », J'ose dire que les essais effectues dans les
laboratoires, sont des reconstitutions restreintes des cas rencontres dans la pratique,
dans des conditions voulues et controlables.
Dans cet article nous avons tente de rassembler quelques cas representatifs
de mise horsservice des constructions et expliquer les causes qui les ont entraines
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26632_a6444d46b497cde4bc4b58c549ad8bed.pdf
Computerverwendung fur die Bauprojekte durch ;
C. P. M.
(Critical Path Methode)
ابراهیم
شیرازی
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26633_2a0021e208ae4269bbe3c0f708b58884.pdf
Supply of Radioisotopes for Power
محمد رضا
حمیدیان
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26634_a66f869a8eb0eedfc0910661d33addd2.pdf
General Solution for MultiStage CounterCurrent Separation Problems.
مرتضی
سهرابی
author
طاهره
کاغذچی
author
text
article
1974
per
The aim of this paper is to show, that it is possible to formulate any
countercurrent stagewise separation process in a general form by setting up a
matrix equation which includes the definitive equations for a particular system
under study.
The most general form would involve the computation of a large number
of partial derivatives, but for many problems it can be reduced to a less complicated
equation.
Further more a method of solution is proposed which ensures a smooth
and rapid convergence in the trial 1; error computations involved.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26635_c5c96f045de4b1dbbc4f0d3cad1a6e30.pdf
Strahlungskopplung einer Schlitzantennen Anordnung aus neun Elementen
بیژن
نخعی
author
text
article
1974
per
Nachdem in vorigem Bericht optimale Anpassung fUr jedes Element einer
Schlitzstrahleranordnung erreicht werden konnte, musste die gegenseitige Beein ,
flussung der Einzelstrahler, die sogenannte Strahlungskopplung (mutual coupling),
untersucht warden
Schlitzantennenanordnungen sind zwar in der erreichbaren Literatur auch
In dieser Hinsicht sowohl theoretisch als auch experimentell untersucht worden,
jedoch handelt es sich dabei urn sehr schmale /2  Schlitze, deren Strahlungsfeld
mit Hilfe des Babinetschen Prinzips berechnet werden kann, da fur sie die Qu,
ali Hit zwischen einer Dipolantenne und einem strahlenden Schlitz gilt.
In diesel Arbeit konnte also bei diesem problem nicht auf bereits bekannte
Ergebnisse zuri.ickgegriffen werden. Es bleibe einer spateren Arbeit vorbehalten,
die hier im weiteren Verlauf aufgebaute Antennenanordnung genauer auf
optimales Verhalten zu untersuchen und veranderliche Crossen zu variieren. Es
kam hier in erster Linie darauf an, einen Prototyp fur weitere Experimente auf.
zubauen.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26636_1eddb0570c6780a3041afaa349c1d18b.pdf
Calculation of External and Internal Surface Areas by Gas
Adsorption With Programmable Calculator Application
فرخ محمد زاده
فرحان
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26637_e41171398ab60ed6121efd8f6c633e49.pdf
Poutres  Cloisons
مهدی
قالیبافیان
author
text
article
1974
per
Jusqu' aces dernieres annees, les poutrescloisons n'avaient pas etc etu .
diees d'une facon systematique. Le developpement rapide des constructions en
grands panneaux prefabriques a accentue la necessite de mieux connaitre Ie comportement
des structures planes chargees parallelement aleur plan moyen. Le Comite
Europeen du beton, pour repondres a cette exigence, a envisage la preparation
des
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26638_41c12a50579e6d6a77baca7f4a71c287.pdf
Effect of Detergents on Water Pollution
مرتضی
حسینیان
author
رضا
خیراندیش
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26639_d3ea59ce39726f1cdb144f58b30f47ed.pdf
The Ion Exchange Demineralizer System For The
Tehran University Research Reactor
مهدی
صرام
author
جمشید مقیمی
دانشیار
author
text
article
1974
per
The core of the nuclear reactor at the Tehran University is located in
a pool with capacity 500,000 liters at a depth of 8 meters. The pool is filled
with city water after passage through a demineralizer system which Increases
the specific resistance of city water from 2000 Ohms per cc to about 1000,000
Ohms per cc.
The reactor is used as a source of neutrons for radioisotope production,
etc. The reaction of neutrons with the constructional material of the reactor
such as aluminum produces ions which are all radioactive. 24Na , 27Mg , 28Al
are produced from 27AI by neutron absorption. Due to the existence of these
radioactive ions and the following reasons, a nuclear reactor such as the one
at the Tehran Univ. Nuclear Center, must have a demineralizer system to remove
the ions:
aThe impurities III the city water, such as Ca, K etc. become radioactive
in the reactor.
b  Pool water must be free of impurities III order to prevent the fuel
element corrosion.
c  The higher the specific resistance of the water, the less will be the
penetration of the core gamma rays to the pool surface area.
Details of the de mineralizer system J its recharging process and other
characteristics are given in the paper.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26640_5295989401fef7b575e156783055baf0.pdf
Study of groundwater resources in the
semiclosed basins of Zagros
سعید
نژند
author
text
article
1974
per
Many closed and serniclosed basins are situated in the Zagros montains
which form a northwestsoutheast chain stretching across south Iran.
The original water supply of these basins was drown from underground
resources of alluvium by qanats and wells.
With the expansion in population and their needs, modern pumping
methods have also been used to supplement these sources of water by further
development of groundwater.
We are losing our groundwater storage in the internal Zagros basins by
the time more and more. Because of that we have to recharge artificialy the
groundwater storage of our alluvial basins by some method of constructions,
spreading of water or by artificially changing natural conditions and also using
the karstic groundwater storage of the Zagros limestones.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26641_5f740b4cf32a47cdf26e3d22649fa641.pdf
Earthquakes in Iran
علی
میثمی
author
text
article
1974
per
The Mission studied the seismicity of Iran and her vicinity and investigated
the destructive earthquakes of this country wich had taken place very
lately. Through these investigations, we were able to know the general tendency
of the occurrence of earthquakes in this country. This tendency shows us that
in the future, it is quite possible for a major earthquake to strike and damage
the great city of Tehran.
Through the same investigation, we also discoverd that the damage of
houses is enlarged when they are built on the soft alluvium
The study of the vibration of the ground during an earthquake and its
effect on buildings and other structures has been developed rapidly in these ten
years in Japan and in the United State. This is a new branch of science called
«Engineering Seismology» wich has been established by the cooperation of seismologists
and engineers. It is desirable that such studies will be conducted in
this country too.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26642_a91cf1baa86fd8c59b95cd2e251e648b.pdf
The Nuclear Engineerig and The Nuclear Engineer
حمید رفیع
زاده
author
text
article
1974
per
In this paper the nuclear engineering h as been introduced as an engine ereng
discipline and the nuclear engineer's duties and responsibilities such as the
design, construction and operation of various types of nuclear reactors is described.
The future trends of nuclear engineering in Iran is also discussed.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26643_346ae436137a116ced027dfc9f728f78.pdf
Iran Needs Nuclear Power Plants, but •••
حمید رفیع
زاده
author
text
article
1974
per
The probable use of the nuclear power plants in Iran with due consideration
of the local conditions, reactor power and type has been studied. Following
the development of nuclear industry in other countries, an example of
the policy which can be adopted in Iran for the use of the nuclear power plants
coupled with the training of the nuclear personnel is discussed.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26644_bf608690d6d46538eb7778b7777f9ffb.pdf
Solution of Differential and Integral Equations
with Walsh Functions
Murlan
S.Corrington
author
جلیل
راشد
author
text
article
1974
per
Any wellbehaved periodic waveform can be expressed as a series of Walsh
functions. If the series is truncated at the end of any group of terms of a given
order, the partial sum will be a stairstep approximation to the waveform. The
height of each step will be the average value of the waveform over the same
interval.
If a zeromemory nonlinear transformation is applied to a Walsh senes,
the output series can be derived by simple algebraic processes. The coefficients
of the input series will change, but there will be no new terms not in the original
groups
Nonlinear differential and integral equations can be solved as a Walsh series,
since the series for the derivatives can always be integrated by simple table lookup.
The differential equation is solved for the highest derivative first and the result
is then integrated the required number of times to give the solution
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26645_4a3c7a1c755de397c2f930dfc4411afb.pdf
Some comments On plate tectonics and the geological history of Iran
منوچهر
تکین
author
text
article
1974
per
Following the great interest in plate tectonics, several interpretations for
the Iranian region have been recently proposed. In this article the limitations
of plate tectonics are pointed out in order to discourage a too enthusiatic support
for a strong antagonism towards plate tectonics. Some comments are
also given on the objections and criticisms raised by Eftekharnejad (1973) on
the proposals of Takin (1972).
For example it is pointed out that the Zagros is a continuation of the
Arabian shield and that the oceanic areas between the Zagors and the rest of
Iran were older and probably more extensive than those or the other parts of
the country. The latter existed for short durations and were probably comparable
with the Red Sea today. The suggestion that Iran was once part of the
Gondwanaland is discussed. It is mentioned that paleomagnetic data are needed
in order to find out the position of Iran relative to Arabia or even to Africa
in the Paleozoic and the Precambrian times. It is emphasized that the Paleozoic
facies similarities alone are not conclusive for solving the problem. It is
also suggested that the northern border of Iran at that time probably ran through
Mashhad, Gorgan, and Talesh areas. The proposal by Eftekharnejad (1973) is
discussed and it is mentioned that the weight of the accumulated sediments does
not cause the downbending and the start of subduction in trenches
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26646_b0d23727189d54025214e0b153feb95d.pdf
La nature et Ies proprietes des orthophosphates de
strontium contenant des ions magnesium
ترابعلی
براتعلی
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26647_0e51bded866614469b457c8833c2e618.pdf
Linear Approximation of the Nonlinear
Differential Equation and Stability
نصرت الله
تابنده
author
text
article
1974
per
In this article, the differential equation of the population growth and
decay is studied. The stability of the point solutions (singular or equilibrium
points) of this equation are investigated. From this and another example we
conclude that although in many cases we can, but we can not always approximate
a nonlinear differential equation by a linear one. Finally at the end, the
Laplace, Liapounov and Poincare's stabilities are defined and a criterion for
approximating a non linear differential equation by a linear one is given.
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26648_3a64f5c54d72c45fa7bfe3c765f4e073.pdf
A TypIcal New Digital Pulse Generator
علی
یوسفخانی
author
text
article
1974
per
University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26649_69079742c9861eb2702953c882d69c95.pdf

محمدعلی
رحمتی
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26650_e032044463b8f5b1deaaff73786d4c5e.pdf

unknown
author
text
article
1974
per

University College of Engineering
دانشکده فنی
08031026
29
v.
0
no.
1974
https://jfe.ut.ac.ir/article_26651_21e054450e26367ad7424f9ebecf3ce1.pdf