نشریه مطالعات مهندسی انتظامی
پیاپی 23 (پاییز 1393)

So far, many studies on the elements bordering the road and cause accidents including human factor, vehicle factor, weather and roads have been made, but in the context of impact of safety equipment and supplies traffic control paths on accidents reduction, extensive research has not been done. Using safety equipment, and its standardisation have a significant impact on reducing accidents. So the main purpose of this study was quantitative and qualitative impact of road safety equipment on accidents in Haraz axis. Haraz axis is one of the main roads, busy and twisting province roads that slope of the linear high, horizontal and vertical high arches, the low road widths, bad weather, lack of traffic-driven and mountain was important factors in road accidents.
Method of research was survey and its instruments of data collection was questionnaire that analysed by AHP model. The population of the study were all drivers of heavy and light vehicles who was traveling in Haraz road. The sample was selected in 1600 drivers. The results showed that Safety equipment and devices to reduce the traffic accident had effect on this axis.

Achievement and success in significant industrial and constructional projects requires systematic approach in planning and controlling how the project is done, considering performance method and cost. In current research, the importance of planning and controlling of project, the advantages of applying this approach and the steps of planning and controlling of project have been studied.

This paper presents a semi-rigid low-rise portal frame nonlinear dynamic analysis. The main objective of this investigation was to propose a
modelling strategy to represent the dynamical behaviour of semi-rigid joints under dynamic actions implemented on the ANSYS finite element
software. The developed finite element model included the geometrical non-linearity and considered the influence of a non-linear and hysteretic
connection stiffness. The updated Lagrangean formulation was used to model the geometrical non-linearity. The results of the present investigation also indicated that when semi-rigid joints geometrical non-linearity effects are considered in the steel frames dynamical response some significant discrepancies in the frame dynamical behaviour could occur.

One of the most important sources of switching noise and power consumption in large VLSI circuits is the clock generation and distribution tree. This paper analyzes how the use of an asymmetric clock can be an important solution to reduce the switching noise generated by the global clock, with a very reduced degradation in performances and reliability. The suited sizing of clock generators and the design of asymmetric clock tree cells, show the benefits of the proposed technique, validated through a design example where a 50% of noise reduction is achieved with 10% of loss in operation frequency and no penalty, even saving, in power consumption.

The use of temporary spaces and multi-function plays an important role in contemporary architecture. The quick installation and setup and dismantling a building in the shortest time Are required. With the increasing need for humans to make the control environment as well as the displacement of people in different situations and environment makes it possible to create spaces and temporary structures has found more importance. Different applications require temporary spaces, such as in the military: the possibility of taking care of the tools and implements of war machines and different climatic conditions and place, hide it from sight the enemies in time of war and time of peace because of this navigable cars such as helicopters, tanks, etc. Hard to take. The possibility to create different climatic conditions in the temporary accommodation with different dimensions are also one of the problems has been that the use of the structures that can be used in addition to covering the space of different spans matching feature to have. Application and technology of sophisticated, high cost and weight is one of the common problems. As well as the needed to build permanent structures with high speed for each user type and cover different spans, such as military training building spaces, administrative services, and in particular for the police, Islamic Republic of Iran does need to be basic.
In this paper, the designed deployable roofs with scissor mechanism that according to different needs and spans are responded. Users in different places will at least have the comfort conditions and the possibility of creating an indoor space for users as well as all the tools and their protection against climatic conditions, protection of sight etc.

Police facilities, according to the provider's security is a fundamental human needs are of particular sensitivity are Therefore, caution should be taken in their design to keep ready in a crisis center to all the principles of passive defense, including location, camouflage and cover fortifications, scatter, deception, shelter, warning, and the technologies defense Observe So that, while not on duty, inherent interference, exigent circumstances to protect the lives of our forces at the center of the risks and efficient in their.

With the increase in population of cities and progress of technology, people demand toward a comfortable life has also increased. Traffic jams in big cities and shortage of parking lots have made necessary the need for use of underground spaces more than ever. The use of underground metro trains as a fast and safe vehicle could be appropriate alternative for passengers. However, movement of trains with appropriate speed in between stations produces vibrations that may sometimes be disturbing for people living in the region. These vibrations which are one of the most serious concerns related to region close to transportation systems could cause vibration of structures and hazardous noises inside buildings. In addition to hazard to human, these vibrations could affect old buildings and equipments. They could cause fatigue in the materials of ground and structure, create differential settlement, crack in walls, resonance and other difficulties. Therefore, in designing new rail road, evaluation of vibrations due to movement of trains is one of the important parameter in selecting the route and the type of rail system. In this research the vibrations in the ground surface due to passage of metro trains in city of Ahvaz metro under construction were evaluated.
By performing dynamic analysis on each station along the metro line and also using empirical method, the vibrations due to passage of train on the surface of ground were predicted and the regions that have high vibration potential are identified. Also the effects of different parameters on these vibrations were evaluated. The results show that in general the levels of vibrations in the northeast part of the route are higher than the southwest part. One of the most important factors responsible for this observation is the shallow depth of the rock and also soil profile in the northeast part of the route. Also the results show that utilization of new methods for damping vibrations cause a considerable decrease in the level of vibrations.