جستجوی مقالات مرتبط با کلیدواژه "investment" در نشریات گروه "عمران"

In recent years, global warming has intensified, and climate change issues have gained great importance. The consequences of this warming trend, along with the growth in population, have caused various proposals to be put forward to develop renewable energy sources to achieve sustainable development. Introduction of pumped storage hydropower (PSH) is a sign of this trend. These plants can store excess energy when demand is low and release it when demand is at its peak. In recent years, the development of these power plants has been followed seriously, and it is expected that investment in such plants will be increasingly high in the future. Due to the importance of meeting climate goals and reducing greenhouse gas emissions, the development of these power plants that produce electricity with minimal carbon emissions is crucial.

The transportation sector includes activities that are widely effective in the processes of production distribution and consumption of goods and services. so, it plays a fundamental role in the economic growth of countries. However, investment in transportation infrastructure despite the positive effects, may not have maximum effects on growth in developing countries due to mismanagement and lack of proper strategy and plan in infrastructure development. As a result, considering the nature of investment in the transportation sectorm this sector and the growth of the national GDP from different dimensions and angles becomes more important. The current research has investigated this issue based on a "vector error correction model" and its estimation in the period from 1373 to 1399. the relationships of the variables used in this model can be specified in the form of three correlation relationships. These three relationships can be examined under the three relationships explaining real GDP, real exchange rate and real investment in the transportation sector, which respectively describe the behavior of the real sector of the economy, the behavior of the currency market and the behavior of investment in the transportation sector. According to the obtained results, the variable of investment in the transportation sector has an effect on the production variable in the long term, and the extent of this influence is such that each one percent increase in the real investment in the transportation sector can be 0.09 percent in growth Iran's economy will be effective.

Considering the importance of expanding the transportation network and its role in the economy, investment in this sector plays an important role in the growth and prosperity of the country's economy. One of the factors influencing investment in the transportation sector is the exchange rate. To investigate the exchange rate shocks, initially, using Hodrick-Prescott filter, predicted shocks and unexpected positive and negative shocks have been extracted. Further, in specifying the investment equation in the transportation sector, in addition to these shocks, the effect of other variables such as the added value of the transportation sector and the interest rate have been examined. For this purpose, using the auto-regressive distributed lag method (ARDL) as well as the error correction model (ECM), the long-term and short-term relationship between investment in the transportation sector and the factors affecting it during the years 1370-1999 has been evaluated. The results of estimating the short-term and long-term coefficients show that the added value of the transportation sector has a positive effect on the investment in the transportation sector, and the interest rate has a negative effect on the investment in the transportation sector. Also, the results show that the expected exchange rate shocks in the short and long term have a positive effect on investment in the transportation sector. In addition, unexpected positive exchange rate shocks also have a negative effect on investment in the transportation sector, and negative exchange rate shocks also have a positive effect on investment in the transportation sector in the long term.  Also, the results of the asymmetry test of positive and negative exchange rate shocks show that the exchange rate has asymmetric effects on investment in the transportation sector.

Oil revenues make up the bulk of government revenues and directly or indirectly particulary affecting national economic variables, in road transportation. Beside, the road transportation sector because of the major contribution to the movement of goods and passengers by this section in our country, is counted more significantly and Efficient and proper management of road transportation activities can accelerate the growth of this sector. The aim of this study is to evaluate the effect of oil revenues in the resources sector of country`s road transportation section that for this purpose, using OLS model and Eviews computer software, the impact of oil revenues on Providing investment resources in country`s road transportation section during the 1989-2016 is studied. According to the findings, increasing of one percent in country`s oil revenues after a year, real investment in the road transportation sector has increased at a rate of 0.38 percent and also the increase of one percent in added value in country`s road transportation section, Actual investment country`s road transportation section has increased about 1.84 percent after one year.

The transportation sector is one of the basic sectors of any economy and investing in this sector increases the mobility of labor and capital and leaves positive side effects on other sectors of the economy. Due to the importance of the issue, in this research, investment in the transportation sector in conditions of production uncertainty has been examined. For this purpose, EGARCH model has been used to calculate production uncertainty and to estimate the main model, the autoregression model with distributed intervals has been used and with the help of EVIEWS10 software, the model has been estimated and the results have been interpreted.The results show that there is a conditional variance heterogeneity in production and this means the existence of production uncertainty. Also, the results of model estimation show that both in the short run and in the long run, with the added value of the transportation sector, the investments made in the transportation sector will increase. Investment in the transportation sector also decreases as production uncertainty increases in both the short and long term. Also, both in the short run and in the long run, exchange rates, inflation rates and interest rates have a negative impact on investment in the transport sector. Also, according to the error correction factor in the ECM model, it can be stated that the adjustment speed towards the equilibrium and long-term value is appropriate, so that in each period about 0.778 the imbalance error is adjusted and the short-term value towards its equilibrium and long-term value exponentially He wants to. The model is also examined in the continuation of diagnostic tests.

Infrastructure and development projects in any country constitute the infrastructure and development of that country. In the implementation of these projects, financing is an important and primary concern due to the lack of infrastructure and infrastructure in the country on the one hand and the lack of capital resources on the other hand, capital has an undeniable role in this. Financing projects is one of the most common investment methods in any country. Undoubtedly, how and how to finance the projects for each level of existing institutions depends on the nature of the project. Paying attention to financing has a high share in solving the problems of financing and launching projects. Therefore, the purpose of this study is to rank the methods of financing from external sources in construction projects. The present study is applied in terms of purpose and descriptive-survey in terms of the nature of the method. In order to collect data, a questionnaire based on multi-criteria decision making method (network analysis method) was used, which was completed by five senior financial engineering experts with at least 10 years of experience in financing projects of construction companies in the west of Tehran. The collected data were analyzed by Super Decisions software. The results of financing ranking showed that international loans with a relative weight of 0.314 ranked first, BOT contracts with a relative weight of 0.21 and finance with a relative weight of 0.171 took second and third place. Findings of the study show that in general, the criterion of higher rate of return with a relative weight of 0.64 than the criteria of lower risk with a relative weight of 0.26 and a ceiling of more funds with a relative weight of 0.1 is of higher importance in financing from external sources in the project. Have civil engineering and should be given more attention.

Inflation is a detrimental economic phenomenon and imposes high economic and social costs on societies at high rates, but the main economic damage of inflation is the uncertainty about its future value. Therefore, this study analyzes the relationship and the uncertainty effect of inflation on capital in the road transport sector during the period 1991-1995. In the present study, the economic effects of inflation uncertainty on Investment in the country's road transport sector are investigated. The EGARCH model is used to calculate inflation rate uncertainty. To estimate the main model, self-regression model with distributed interpolation is used and EVIEWS10 software is used to estimate the model and interpret the results. The results show that there is a conditional heteroscedasticity in the inflation rate, which means that there is uncertainty in the inflation rate. Also, the results of the model estimation show that both in the short run and in the long run as the GDP increases, investment in road transport increases and with rising inflation uncertainty, investment in road transport will decrease. Interest rates, both in the short and long run, have a negative impact on investment in the road transport sector. Also with respect to the error correction factor in the ECM model it can be stated that the adjustment rate is appropriate to the equilibrium and long-run value, So that in each period, about 0.36 error of equilibrium is adjusted and in the short run tends to equilibrium and exponentially in the long run.

Deciding whether to purchasing or leasing machinery and equipment is one of the most important decisions making in management of the roads construction project. In this paper, a new model has been designed and used for estimating the cost of one ton of asphalt in the state of purchase of asphalt plant, and compare it with the cost of one ton of asphalt in the state of lease. The cost of producing each tone of asphalt in the state of lease is a specified and deterministic cost and it is part of the decision-making process in terms of certainty, while that the cost of ownership and operation in the purchase terms are uncertain and variable. Therefore, in this paper, decision making methods in terms of uncertainty (risk) and expected value has been used for calculate purchasing costs. According to the results in each project, depending on the amount of asphalt required, there is a break-even point that for values less than this point, the rent will be economic and for more values than this point, the purchase will be economic.

Capital as an important element in production, a decisive role in the production process of whole economic sectors. Besides, regarding the importance of growing transportation network and its impression on the economy, investment in this division significant role in the growth and prosperity of the irans. Hence, in this paper the beginning of the incremental capital output ratio was used and explained that, for rail transportation sector in the period 1975-2012, the incremental capital output ratio has been figured. The subject of investment in rail transportation sector value added growth with the neoclassical growth model And model Vector Auto Regression and software is estimated Micro fit and Eviews. The results of the calculation of the incremental capital output ratio show that this ratio is equivalent of 1.084 and This means that for producing a billion rials value added in rail transport section need to invest equivalent 1.084 billion rials is necessary. The results of the estimation show that an increase of one percent in the ratio of investment made in the rail transport sector on the gross domestic product this section will be Increase the value added growth rate of 0.315 percent.

One of the basic human needs which find extensive range of social and economic development, and today is one of the manifestations of civilization Hml Vnql It results in question. Hml Vnql and services in many parts of the adverse economic Kk·h plays an important role in production and employment. In addition to these broad economic effects compared with other industries, the growing importance of this sector decreased. Therefore, in this study to evaluate the impact of infrastructure development on the Tehran-Tabriz Hml Vnql a questionnaire from experts and specialists as well as regression techniques are discussed. The results indicate the fact that the region’s economy, particularly employment index Hml Vnql infrastructure has a positive effect. In other words, investment in this sector and increase the mobility of labor and capital in the amount of 57/0% of job creation in other parts of GME, which can be a positive and significant economic impact behind. So that with a single investment in the sector Hml Vnql respectively parts of the economy such as agriculture, industry and services to the 57/0, 33/0, 435/0 units in their structure and will increas.d can cause an increase other economic impacts and ultimately lead to regional economic development.

Road transport as one of the factors of affecting economic, Displacement of goods and passengers, areas of access to facilities and national welfare increases and Investment in this sector as a key factor, determining a critical role in the road transport sector is growing. Therefore, the transitional capital of the department of road transport and the changes is important in this section and Understanding of the quantitative and qualitative, decision-making and planning in the road transport sector in the macro and micro levels, is important.
The objective of this paper is analysis of investment on economic growth in Iran's road transport sector for this purpose, the criteria used Incremental capital output ratio and explaining for road transport sector in the period 1389-1353, Incremental capital output ratio is calculated. The neoclassical growth model, investigated the effect of investment on economic growth in Iran's road transport sector.
According to the research findings, if a percent Increase the investments made in the road transport sector on GDP, the value added rate will grow % 0.213 and increasing in rates of labor growth in Road Transportation will result in increased growth rate of value added in road transport to 0.389. Also, a percent increase of energy consumption in road transport and export of crude oil Road transport sector's growth rate increased of 0.157 and 0.383percent & Dummy variable for war period has a negative effect.