**On one queuing system with unreliable service system. **

R. Khurodze, V. Khocholava, I. Mikadze. “Problems of Applied Mechanics”. Tbilisi,
2003, ¹3 (12), p. 9-18, (engl.).

Here is investigated the queuing system with unreliable service system in steady,
as well as, unsteady state regime. Poisson stream of requests arrive into the
system. Service system undergoes failures distributed by hyperexponential law.
Request service time and queuing system repair time are distributed by arbitrary
law. Virtual time of waiting in queue is found. 9 Bibl. Engl.; summ. in rus.

**Dynamic precision of a hinged-lever system for a railcar braking. **N.
Davitashvili, A. Chkhaidze, G. Sharashenidze, A. Sharvashidze. “Problems of
Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 19-27, (engl.).

In this paper, the study of dynamic precision of a hinged-lever system for a
railcar braking with one-sided press of shoes, taking into account initial (technological)
errors, clearances in kinematic pairs and elasticity of links, has been offered.
2 ill. Bibl. 11. Engl.; summ. in rus.

**Optimal brake leverage for a railcar wheel with two-sided press on
the shoes and calculation of its characteristic parameters**. G. Sharashenidze,
S. Sharashenidze. “Problems of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p.
28-36, (engl.).

In this paper, the basic characteristic kinematic and dynamic parameters of
optimal brake leverage for a railcar wheel with two-sided press on the shoes
are given. Mathematical expressions for the changes of kinematic and dynamic
parameters of leverage links in the case of existence of common arm are received.
By vectorial projecting of the closed contour of leverage mechanism there are
received rotary kinematic parameters of the links. The received results can
be used in further study of given leverage when determining kinetic energy of
the leverage and composing the system of differential equations for its motion.
3 ill. Bibl. 11. Engl.; summ. in rus.

**On the taking into account of indices of reliability when designing
agricultural machines.** R. Makharoblidze, Z. Makharoblidze, I. Dzirkvadze.
“Problems of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 37-40, (rus.).

The shortcoming of existent methods of calculation of agricultural machines
is that indices of reliability are not directly related with change in time
of physical and mechanical properties of constructional materials and also with
geometric, kinematics and dynamic parameters of machines and with exploitation
regime. Lack of such relations makes it difficult to determine optimum parameters
of machines by generalized criteria of reliability on the stage designing. Having
used the theory of standing out random function beyond the given level, the
functional dependence of coefficient of margin of safety upon statistical indices
of load, probability of safety work and upon service life of machine, is determined,
which enables to assign parameters of machines more substantially. 1 ill. Bibl.
2. Russ.

**Investigation of conditions of motion and oil expenditure of motor-lorry
with diesel engine.** G. Emiridze, O. Ghelashvili, J. Iossebidze. “Problems
of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 41-44, (rus.).

Generalized model of motor-lorry with diesel engine has been worked out according
to motion phases; this model is adequate to its real work conditions on line;
on its basis one can construct oil expenditure model. Determining method of
oil expenditure by motor-lorry motion phase permits to make a prognosis of oil
expenditure in real operational conditions. Operational-dynamic characteristics,
suggested for transient and transitional motions of motor-lorry, permit to determine
a linear fuel oil expenditure and to evaluate driver’s skill for concrete conditions
of motor-lorry’s exploitation with diesel engine. 4 ill. Bibl. 2. Russ.

**Numerical modelling of water-level oscillations in closed pond.**
A. Bregvadze. “Problems of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 45-49,
(rus.).

Modified model of water oscillations in a pond has been offered with regard
for transversal direction of variable sea depths with different dimensions.
Numerical experiments are carries out with the purpose to remove break-down
situations in trans-shipping works in seaports. 7 ill. Bibl. 5. Russ.

**Mathematical guaranty of identification for ruptures point in optimal
fiber sensor with “spider network” configuration. **

J. Bakhtadze, L. Abramidze, S. Bliadze, G. Lagundaridze, M. Samadashvili. “Problems
of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 50-55, (rus.).

Here is represented optical fiber sensor with “Spider Network” configuration.
Superiority of this type of sensor towards the other optical fiber sensors,
regarding to six effectively cracks in the research constriction, is considered.
It is elaborated the mathematical model of optical fiber’s break point rein
the “Spider Network” configuration net. 4 ill. Bibl. 2. Russ.

**Reynolds number correction for ultrasonic flow meter. **

D. Kiguradze. “Problems of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 56-60,
(rus.).

Computer study of the correction factor on Reinolds number for ultrasonic flow
meter and table with mentioned factors are developed, used for measuring of
the contaminated, aggressive and quickly crystalized fluids and pulps, as well
as flows in which major pulsation of flow rates are possible and no other types
of flow meters may be used. 6 ill. Bibl. 3. Russ.

**On integration of branches of Georgian light industry in foreign market
segmentation.** T. Maglakelidze, L. Demetradze. “Problems of Applied
Mechanics”. Tbilisi, 2003, ¹3 (12), p. 61-63, (rus.).

Integration problem of Georgian purposeful markets with peculiarities of up-to-date
world market, segmentation diagram of foreign market and the aggregate of factors,
influent on consumer demand, are studied. General condition of branches of Georgian
light industry are described. The necessity of studying purposeful markets,
spontaneously formed in Georgian, and analytical investigating political, economic,
psychologic, structural and many different factors is shown, creating a possibility
to integrate branches of Georgian light industry in foreign market segmentation.
1 ill. Bibl. 3. Russ.

**Theoretical basis of mechanization and automatization processes of
vans’ uncoupling on sorting hills.** A. Bichinashvili, A. Koreli, L.
Bokuchava, N. Kakiashvili. “Problems of Applied Mechanics”. Tbilisi, 2003, ¹3
(12), p. 64-69, (rus.).

In this article, it is stated the possibility of devices adaption for automatical
uncoupling of vans on sorting hills. The efficiency of practical use of these
devices is shown. 1 ill. Bibl. 4. Russ.

**About processing abilities of sorting hills during the service of some
categories of vans.** A. Bichinashvili, A. Koreli, L. Bokuchava, N. Kakiashvili.
“Problems of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 70-75, (rus.).

In this article, it is given the study of sorting hills working during the service
of trains with vans, prohibited their lowering from the hills. The special diagram
is prepared, determining the value of reducing sectional trains within 24 hours.
2 ill. Bibl. 3. Russ.

**Definition of expenditure of diesel oil of motor-lorry according to
phases of motion. **G. Emiridze, O. Gelashvili. “Problems of Applied
Mechanics”. Tbilisi, 2003, ¹3 (12), p.76-78, (rus.).

It is worked out a method of definition of expenditure of motor-car oil with
diesel engine according to phases of motion, there is founded on generalized
model of automobile work on a line. On the basis of constructive and operational
parameters there is calculated the analytical method of definition of linear
expenditure of diesel oil in real conditions. Implementation of this method
in Batumi’s and Tbilisi’s (Georgia) motor transport enterprise brought a certain
saving. Bibl. 2. Russ.

**Characteristics of rocks AT static and dynamic loading. **V.
Japaridze. “Problems of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 79-81,
(rus.).

Characteristics of rocks at static and dynamic loading is considered on the
basis of results of tests of durability: tensile strength, bending strength,
shearing strength. 2 ill. Bibl. 5. Russ.

**Some questions of ecological program of protection of atmosphere.**
N. Gheladze. “Problems of Applied Mechanics”. Tbilisi, 2003, ¹3 (12), p. 82-85,
(rus.).

Maximum single permissible concentration of unhealthy substances for a man,
plants and biosphere compared. Within the bounds of purpose power-ecological
analysis, the correction of a list taking priority of unhealthy substances with
regard for effect of summation is carried out. The possibility to form new components
with very high degree of danger under influence upon smog of solar radiation
is underlined. Bibl. 9. Russ.

**The membranous foundation in building and its designed algorithm and
program. **M. Pashiashvili. “Problems of Applied Mechanics”. Tbilisi,
2003, ¹3 (12), p. 86-87, (rus.).

New engineer method is proposed, that allows to design a conic membranous foundation
with big degree of reliability. The algorithm and a program for design of the
conic foundation worked out. Bibl. 3. Russ.