درخت حوزه‌های تخصصی

اقتصاد انرژی

ترتیب بر اساس: جدیدترینپربازدیدترین
فیلترهای جستجو: فیلتری انتخاب نشده است.
نمایش ۲٬۹۲۱ تا ۲٬۹۴۰ مورد از کل ۳٬۱۳۰ مورد.
۲۹۲۱.

A Comprehensive Structural Equation Modeling for Financial Performance Evaluation of Petrochemical Companies(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۸۴
Financial performance evaluation emerged as the great academia and business concern in the competitive world, today. In order to clarify the progress status and improvement trend of finance, it is of supreme significance to appoint a professional financial performance evaluation study for supportable progress of enterprises. This research focused on the seven important factors which represented principal effects on the financial performance of the Persian Gulf petrochemical companies. In order to achieve the research objectives, experts and engineers of 12 companies in the Persian Gulf petrochemical industry have been surveyed by sampling method, in which 180 questionnaires have been completed and the basis of the work has been used. By the confirmatory factor analysis (CFA) divergent validity of all desired factors as well as correspondent of the questionnaire were approved. To meet the research goals, non-parametric analysis demonstrated the main hypothesis of the study regarding the effectiveness of all under investigation parameters. By the Friedman ranking test, the internal processes and external environment of the organization provided the highest and the lowest rank of impact on the financial performance of the Petrochemical companies under review, respectively
۲۹۲۲.

Evaluate the Financial Performance of Petrochemical Companies through the Interpretive Structural Modeling: a Special Case Study(مقاله علمی وزارت علوم)

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تعداد بازدید : ۵۸۶ تعداد دانلود : ۴۵۴
The present study was conducted with the aim of designing a model for evaluating the performance of financial units in petrochemical industry. This exploratory practical study carried out based on the descriptive-analytical method and all data were gathered via two separate processes as interview and literature review. The statistical population included professional and academic experts in the field of human resources (HR) to answer qualitative questions by targeted sampling for experts. According to the experts’ opinion, in order to identify effective factors, the Grounded Theory method and Interpretive Structural Method (ISM) were applied for evaluation of method and structural equations, respectively. After reviewing all the 67 indicators of financial performance that were extracted from theoretical foundations and previous research, 48 indicators have been approved by Delphi Roxab Group and then were selected. Finally, content factor analysis showed that all 48 indicators are significant enough. The novelty of this research compared to the similar ones raised from identifying the factors related to "production and procurement" and so "marketing" of the understudy organization that have not been evaluated in the previous studies.
۲۹۲۴.

A Review On Contractual Risk Allocation In Usance Finance Contracts(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۸۰ تعداد دانلود : ۳۵۲
Oil and Gas projects as are very complicated. A wide range of risks are included in oil and gas projects and contracts. Different aspects of risks can be addressed in a risk management process which assessment, efficient distribution and allocation of contractual risks are of a high importance. Many researches have studied the Project Risk Management in oil and gas industries with focus on legal and contractual risks aiming to reach to an optimal risk distribution which does not necessarily mean to have a complete contract. In this article with the goal of reviewing contractual risk allocation in Usance finance contracts, a thorough study has been done on related researches and then a complete review has been done on different contracts in Downstream petrochemical projects. Concentration on used risk management mechanisms in both cases and related risks shows severe issues and bugs in both contracts. Some contractual risks are not addressed at all and the case contracts are not balanced in the view of contractual risks distribution.
۲۹۲۵.

Comparison of Stringency of The Environmental Requirements and Compliance with Them in Upstream Sector of Oil and Gas in Iranian and American Law(مقاله علمی وزارت علوم)

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تعداد بازدید : ۵۸۰ تعداد دانلود : ۴۱۲
The purpose of this study is to compare stringency of and compliance with environmental requirements in upstream sector of oil and gas in law of Iran and the USA. This study is conducted using the inter-spinned mix method (qualitative – quantitative). In the qualitative part, library studies are used. In the quantitative part, the studied society is a group of six professionals in the field of oil and gas, who filled out a questionnaire consisted of 34 questions prepared by the Worley Parsons in a similar research approved by jurisdictions of ten countries. The questions are prepared by a team of experts with international experience. The components of stringency and compliance with law during the phases of approval, operation, and closure of a hydrocarbon project are studied using the Delphi method. At the level of stringency, the environmental assessment in the US is carried out with 10 times more human resources and 26 times more costs than in Iran. In the US, with 13 scores, it is more stringent than Iran with 5 scores. In the project closure phase, Iran does not put in place any obligations for rehabilitation and restoration. At the level of compliance, the Construction Environmental Management Plan (CEMP) is mandatory in both countries. In Iran, the list of violations and their consequences will not be published. The US regulatory mechanisms of restoration are an appropriate model. Totally, Iran gains 29 and the United States 42 scores. The recommendations are based on these two scores.
۲۹۲۶.

بررسی چالش ها و جذابیت های الگوهای قراردادهای بین المللی خدماتی در تامین مالی پروژه های بالادستی صنعت نفت ایران و عراق(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۹ تعداد دانلود : ۳۹۶
میانگین عمر بالای تأسیسات سطح الارضی، ورود به نیمه دوم عمر میادین بزرگ، کاهش ضریب بازیافت مخازن نفتی و عقب ماندگی ایران از توسعه میادین مشترک از مهمترین چالشهای بخش بالادستی صنعت نفت ایران است لذا با توجه به عدم امکان تامین مالی و سرمایه لازم از محل منابع داخلی ضروری است، سرمایه گذاری خارجی و روشهای قراردادی آن در این حوزه بیش از پیش دیگر مورد توجه قرار گیرد، بهمین دلیل در این پژوهش، عملکرد مالی- اقتصادی الگوی قراردادهای خدماتی ایران و عراق در راستای جذب سرمایه گذاری خارجی و تامین مالی پروژه های توسعه و بهره برداری از میادین نفتی، بررسی و مقایسه می گردد. در این راستا از تکنیک شبیه سازی مالی و تحلیل حساسیت نرخ بازده سرمایه گذاری پیمانکار نسبت به تغییرات پارامترهای مالی الگوهای قراردادی مذکور استفاده شده است. نتایج نشان می دهد، الگوی قراردادی آی پی سی در مقایسه با بیع متقابل ضمن ایجاد انگیزه هایی در پیمانکار برای تحقق تولید صیانتی، نتایج اقتصادی مطلوب تری برای پیمانکار فراهم می نماید اما الگوی قراردادهای خدماتی عراق بدلیل کوتاهتر بودن دوره بازگشت سرمایه که منجربه تسهیل تامین مالی پروژه و کاهش ریسک هزینه های سرمایه ای می گردد بویژه در قیمتهای بالای نفت برای پیمانکار، جذابیت بالاتری دارد.
۲۹۲۷.

The Parameters for Drafting Insurance and Indemnity Contractual Clauses as the Subset of Risk Allocation Provisions Outlined in the Main Types of Upstream Petroleum Contracts; the case study of IPC(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۶ تعداد دانلود : ۳۱۸
Various hazards exist in the upstream oil and gas industry. Therefore, the contracting parties of any petroleum contract always try to reduce the inevitable economic burdens of occurring adverse events arising out of risks in the course of petroleum operation by applying legal approaches such as contractual risk allocation provisions, which can be realized by drafting efficient insurance and indemnity clauses as the subset of risk allocation provisions. Hence, this study addressed the main research question of “What are the necessary parameters for drafting the insurance and indemnity clauses in the main types of upstream petroleum contracts?” To achieve this end, the mentioned clauses stipulated in the main types of upstream petroleum contracts, have been examined; including concessions, production sharing, and service contracts of 15 different countries around the world besides the comparative analysis with the new model of Iranian Petroleum Contract (IPC). Eventually, the hypothesis of this study stating “There should be several parameters such as liability towards risks, limitation of liability, exclusions/exemptions, etc. for drafting the insurance and indemnity clauses in these contracts” verified. That is the result and the answer to the research question. Moreover, the comparative analysis of the extracted set of parameters needed to draft these clauses legally, with the related ones in IPC has been done. Therefore, it led to the detection of the existing contractual shortcomings. Thereafter, the necessary suggestions to resolve them are offered, which can enhance the effectiveness of the upstream petroleum contracts and avoids potential litigation in this regard.
۲۹۲۸.

The Energy Programs of American Parties (Republicans and Democrats) and the Global Oil Market(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۴ تعداد دانلود : ۴۴۵
The United States is the world's first producer and consumer of oil and play a special role in international oil market relations. In a sense, due to the differences in the energy programs of the parties of this country, we will see significant changes in the international energy markets. The Trump's economic thinking in business field is based on the neo-mercantilist while the Democrats believe in global and multilateral trade. The most important energy policies of the Republican Party are the development and expansion of fossil fuel production, increasing the share of the oil market, lifting environmental restrictions, confronting OPEC, and unilateralism in the oil and gas trade. In contrast, the Democrats' most important plans in the US election are to return to the Paris Agreement and re-impose environmental restrictions, reduce oil production through legal sanctions such as taxes, expand renewable energy and use financial resources to manage the oil market and trade convergence. The main question of this article is what effect do US parties energy programs have on the oil market? The method of this research is a qualitative in a descriptive-analytical manner using desk research.
۲۹۲۹.

Indirect Expropriation in the Petroleum Industry: The Response of International Arbitrations(مقاله علمی وزارت علوم)

نویسنده:
حوزه‌های تخصصی:
تعداد بازدید : ۵۷۴ تعداد دانلود : ۳۰۶
The present article aims to argue indirect expropriation in international petroleum agreements and to analyse the response of international arbitrations. In particular, international arbitral awards by the Iran-US Claims Tribunal, the Yukos case as an Energy Charter Treaty Arbitration and certain North American Free Trade Agreement cases have been examined. The recent trend shows that taking of foreign investors’ property may take place not only through legislation or nationalisation but also by indirect methods that can have the same effect as direct expropriation. Indirect expropriation does not necessarily require transfer of legal title from the international oil company to the host state. Hence, it is difficult to make a distinction between legitimate regulation and measures, which are tantamount to expropriation with the payment of compensation. The identification of an indirect expropriation is complex and depends upon the examination of the legitimate expectations of the investor concerning enjoyment of its investment. Host governments may employ different methods to achieve what amounts to direct taking, but without acknowledging it as such, to avoid legal consequences of expropriation and then payment of compensation.
۲۹۳۰.

مدیریت درآمدهای نفتی با رویکرد پایداری در سرمایه گذاری دولت: مطالعه موردی اقتصاد ایران(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۲ تعداد دانلود : ۴۶۹
رویکرد نوین سیاستگذاری مالی در کشورهای در حال توسعه و صادر کننده کالاهای خام (بویژه نفت) راهکاری از طریق پایداری و افزایش مقیاس سرمایهگذاری « بنیه هلندی » و هدایت اقتصاد به « بیماری هلندی » برای اجتناب از دولت، ایجاد ثبات بیشتر در نرخ ارز حقیقی و پایداری رشد اقتصادی است. این موضوع در قالب یک الگوی تعادل عمومی تصادفی پویای نوکینزی برای اقتصادی باز و کوچک مانند ایران ارایه میشود. درآمد حاصل از فروش نفت توسط دولت با تصریح قواعد مالی برای پسانداز، مخارج جاری و عمرانی تخصیص داده میشود. فرایند این تخصیص شامل دو مرحله است: اول، بخشی از درآمدها در صندوق توسعه ملی ذخیره میشود. دوم، از مقدار باقیمانده بخشی صرف هزینههای جاری و بخشی دیگر صرف هزینههای عمرانی میشود. در این مقاله، با تخمین پارامترهای ساختاری و قواعد ابزاری از روش بیزین، سهم تخصیص یافته به صندوق ذخیره، مخارج مصرفی و عمرانی دولت که متناظر با پایداری و افزایش مقیاس سرمایهگذاری است، تعیین میشود. مقایسه سناریوهای مختلف در اقتصاد ایران نشان میدهد استفاده از صندوق توسعه ملی به همراه ذخیرهسازی بخشی از ارز حاصل از فروش نفت و عقیم سازی افزایش خالص ذخایر خارجی توسط بانک مرکزی علاوه بر اینکه باعث حداقل شدن تابع زیان سیاستگذار و پایداری بیشتر سرمایهگذاری دولت و کاهش تلاطم نرخ ارز حقیقی میشود، بلکه مقام پولی را هم در اجرای اهداف خود یاری میدهد.
۲۹۳۱.

اقتصاد سیاسی انرژی های تجدیدپذیر و سناریوهای آینده ایران در چشم انداز گذار انرژی 2050(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۱ تعداد دانلود : ۳۶۵
در سال های اخیر، سهم انرژی های تجدیدپذیر در سبد انرژی جهانی افزایش چشمگیری داشته است. این موضوع به ویژه برای کشوری مثل ایران که بخش اعظم اقتصاد آن متکی بر درآمدهای حاصل از سوخت های فسیلی است، پیامدهای ژئوپلیتیکی به دنبال خواهد داشت. مقاله حاضر با بررسی روند گذار اقتصاد جهانی و منطقه ای به سوی انرژی های تجدیدپذیر و پاک، تلاش دارد جایگاه ایران را در آینده نظم در حال گذار انرژی ترسیم کند. سؤال اصلی مقاله این است که در عصر گذار انرژی که سوخت های پاک محرکه اقتصاد جهانی خواهند بود، ایران چه جایگاهی در چشم انداز ژئوپلیتیک اقتصاد انرژی جهانی 2050 خواهد داشت؟ روش پژوهش از نوع کیفی و مبتنی بر سناریونویسی و ابزار گردآوری داده ها مبتنی بر مصاحبه و پیمایش پنل خبرگی است. یافته های پژوهش در قالب چهار سناریوی محتمل شامل، «تحقق توسعه پایدار و گذار به طلای سبز»، «گذار تدریجی و مستقل به سوی توسعه پایدار و طلای سبز»، «توسعه مبتنی بر طلای سیاه» و «درماندگی توسعه با طلای سیاه» ارائه شده است. این سناریوها طیف گسترده ای از وضعیت های ممکن را شامل می شوند. آشنایی با روایت هرکدام از این سناریوها و مقایسه مطلوبیت آنها، کنشگران و تصمیم گیران را قادر می سازد تا در سیاست گذاری های حوزه انرژی های تجدیدپذیر حالت های مختلف را مدنظر داشته باشند.
۲۹۳۲.

Corporate Social Responsibility and Value-At-Risk; Petrochemical Companies Listed on Tehran Stock Exchange(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۱ تعداد دانلود : ۴۹۵
It seems that paying attention to social responsibility by companies can lead to a better stakeholder’s view toward the company, thereby increasing their loyalty and trust. Having the ability to obtain more financial resources in times of crisis, due to the greater loyalty of investors, will result in reducing the company risk. In contrast, being overconfident about the loyalty of individuals to the company can lead to keeping a short-term debt structure, thereby increasing the risk of obtaining financial resources. Recently, the negative impacts of petrochemical companies on the environment have made social and environmental groups focus more on this industry, and this focus has pushed companies into involving in more social activities. Considering the potential impact of CSR on the company’s risk, this study examines the relationship between corporate social responsibility and value at risk in petrochemical industry using a sample of 27 companies listed on the Tehran Stock Exchange during the 2010-2017 period. Eviews 10 is used for computing and analyzing the data, and the generalized auto regressive conditional heteroskedasticity (GARCH) model is employed to estimate value at risk. The results indicate a negative and statistically significant relationship between corporate social responsibilities and company value at risk. <strong> </strong>  
۲۹۳۳.

Explaining the model of outsourcing development management of physical assets in the oil and gas industry: A case study of Iranian Gas Transmission Company(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۳ تعداد دانلود : ۵۱۲
Today, the strategy of outsourcing management, in economic enterprises and especially in government organizations, is one of the most important issues in the field of procurement chain management and Strategic Alliance Management. This issue is of special importance in public organizations and institutions. Because these organizations usually have a wide range of missions and supply chains, and according to macro policies and strategies, they need a comprehensive plan for outsourcing. Despite this importance, few studies have addressed the models of outsourcing development in firms. The purpose of this paper is to explain the model of outsourcing development management in the oil and gas industry, based on using content analysis method and deductive approach to the theoretical framework developed in practice through case analysis in Iranian Gas Transmission Company as the company with the most physical assets control on Iran. With this aim, the information required for the research, in addition to the researchers' observation and reviewing the related documents, was obtained through interviews with a significant population of senior managers and experts in the Iranian oil and gas industry. Using theme analysis method, this information was analyzed and the expected situation of the outsourcing development management in the industry, and the impact and interactions, were described and explained.
۲۹۳۴.

تدوین و تحلیل سناریوهای مدیریت عرضه و تقاضای سیستم انرژی ایران برای کاهش آثار زیست محیطی با استفاده از مدل ساز LEAPLEAP(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۷۰ تعداد دانلود : ۳۹۲
امروزه در بیشتر کشورها به ویژه کشورهای در حال توسعه، رشد اقتصادی محور برنامه ریزی ها به شمار می رود. از آنجا که بستر فعالیت های اقتصادی، محیط زیست است متأسفانه رشد، پیامدهای ناگواری برای محیط زیست انسان ها به همراه داشته است. هدف اصلی مطالعه، اندازه گیری کاهش انتشار آلاینده های زیست محیطی و گازهای گلخانه ای تحت سناریوهای سیاست گذاری در مقایسه با سناریو مرجع است. روش پژوهش در این مطالعه استفاده از روش تحلیل سناریو براساس مدل برنامه ریزی بلندمدت جایگزین های انرژی (LEAP) است. یافته های پژوهش نشان می دهند با طراحی سناریوهای مدیریت سمت تقاضا و عرضه انرژی یعنی جایگزین کردن انرژی های تجدیدپذیر و انرژی برق به جای انرژی های فسیلی (نفت خام و گاز طبیعی) میزان کاهش انتشار آلاینده های زیست محیطی تا افق1420 در مقایسه با سال 1393 (سال صفر برنامه ریزی)، 5/123 میلیون تن می باشد.
۲۹۳۵.

The Moderating Effect of Firm Value and liquidity on the relationship between Managerial Overconfidence and R&D(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۶۸ تعداد دانلود : ۳۶۸
Overconfident managers, who tend to overestimate their capabilities, underestimate the possibility and impact of side effects in projects. The purpose of this study is to review the effect of managerial overconfidence on research and development expenditures and the moderating effect of firm value and liquidity on this relationship. For this purpose 51 companies were chosen from oil/gas, and petrochemical Companies listed on the Tehran Stock Exchange over the period 2012-2017. This research, within three basic hypotheses, is analyzed by Eviews software and shows that managerial overconfidence has positive effect on research and development. Company liquidity has direct effect on relationship between managerial overconfidence and R&D, but firm value has no meaningful effect on the relationship between managerial overconfidence and R&D. <strong>Keywords</strong>: managerial overconfidence, R&D, liquidity, firm value
۲۹۳۶.

The Effect of Petrochemical Industry on Relationship between Information Asymmetry about Investment Risk and Financing Choices(مقاله علمی وزارت علوم)

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تعداد بازدید : ۵۶۴ تعداد دانلود : ۴۲۳
Though it is generally accepted that information asymmetry has an impact on capital structure policy, the nature of the information asymmetry is not well understood. Recent theoretical works and empirical evidences suggest that financing choice depends upon the information asymmetry about investment risk of the particular use of funds (Halov & Heider, 2012) (Rao, Mohanty, & Baxamusa, 2015). Consistent with this view, we analyzed the data gathered among 199 companies listed in Tehran Stock Exchange during 2009-2016 by The Multiple Linear Regressions in order to test research’s hypotheses have been applied. We also examined the influence of Petrochemical industry on that relationship. The findings show that equity is used to fund projects with greater information asymmetry about their risk such as intangible assets and capital expenditure, while debt is used to fund investments with lower information asymmetry about their risk such as liquidity enhancement. We also found that the membership in petrochemical industry has no effect on the intangible assets and cash holding’s financing method, but concerning with capital expenditure and working capital the impact is significantly negative.
۲۹۳۷.

Evaluating and Prioritizing Asset Management Excellence Model Based on Critical Criteria Using the Combination of DEMATEL and ANP Techniques(مقاله علمی وزارت علوم)

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تعداد بازدید : ۵۶۴ تعداد دانلود : ۳۹۵
Today for installations management in equipment-based industries, such as oil and gas industry, the physical asset management development based on the ISO-55000 requirements is generally the most common issue in the world and particularly in Iran. Since this standard only expresses the requirements, many physical asset management excellence models have been designed by researchers or research institutes around the world to develop and strengthen physical asset management. Therefore, due to the diversity of models, organizations face problems of choosing a suitable model. Based on this issue, the main purpose and innovation of this work is evaluating and prioritizing popular and sometimes reference physical asset management excellence models according to 6 critical criteria based on DEMATEL and ANP techniques. Cost, risk, performance, sustainability, simplicity, and knowledge were identified as the critical criteria. First, 4 criteria were taken from the ISO-55000, and 2 critical criteria were then identified through interviewing oil and gas experts. The approach of this research is quantitative, and the method of data collection is descriptive-survey. Uptime, Institute of Asset Management (IAM), life cycle engineering (LCE), and asset integrity management (AIM) models are the main popular and/or reference physical asset management excellence models in the world. The finding shows that the IAM, LCE, AIM, and uptime models are respectively prioritized based on these critical criteria. <strong>Keywords:</strong> Physical Asset Management Excellence Model, ISO-55000 Standard Series, DMATEL, ANP
۲۹۳۸.

Optimal analysis of valuation of petrochemical stock in the capital market by Total Interpretive Structural Model(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۶۳ تعداد دانلود : ۴۱۶
The purpose of this study is to level the optimal analytical topics for evaluating the cost of petrochemical stock in the capital market. In this study, which was synthetic and inductive-deductive in terms of data collection method, 12 accounting and financial management specialists at the university level participated as panel members in the quality department. In fact, in the qualitative part, which used meta-synthesis and Delphi analysis, the aim was to identify the optimal analytical themes for the valuation of cost-effective stocks and then, in a small section with the participation of 16 petrochemical brokers, to classify the identified statements in the form of a total interpretive structural modelling based on impact priority. Therefore, relying on meta-synthesis analysis, 12 studies were first evaluated as the basis for evaluation to determine the optimal analytical themes of cost-based stock valuation based on critical evaluation, based on which 11 themes were selected propositions and entered into Delphi analysis to determine theoretical adequacy. In this stage, 3 propositions were removed during the two stages of Delphi analysis and a total of 8 analytical propositions of stock valuation were economically entered into the quantitative analysis section, ie total interpretive structural analysis. In this section, the results show the most influential analytical themes of cost-effective stock valuation in the petrochemical industry, two statements of normal stock market price analysis based on the current rated price of "K2" and a focus on the net asset value is "K3", which is at the fourth level of this model.
۲۹۳۹.

A model for examining exchange rate shocks affecting on Financial Sustainability in export-oriented companies(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۶۴ تعداد دانلود : ۴۷۶
One of the variables affecting the behavior of enterprises is the exchange rate. Uncertainty about the amount of exchange rate volatillity for each firm is considered as a risk. The aim of this study is to explain a model to investigate the effect of exchange rate shocks on the financial sustainability of export-oriented companies. In this regard, the data on exchange rate, tax, oil revenue and export variables on financial sustainability was collected for 19 groups of companies from 2008 to 2019. To achieve the research goal, the Panel Vector Autoregressive Model (PANEL VAR) using the generalized method of moments (GMM) was used to analyzed the data. Then the results were interpreted using the Impulse Response Function and variance decomposition. The results of the IRF show that the effect of exchange rate volatility on the financial sustainability variable is initially negative, but has a positive effect over time and is neutralized after several periods. The same goes for an impulse equal to a standard deviation in tax. Also, the oil revenues and exports impulse have negative and positive effects on financial sustainability, respectively. According to the results of variance decomposition, it can be said that the effect of exchange rate on financial sustainability is greater than the effect of sustainability on exchange rate, because the exchange rate shocks have more explanatory power for sustainability fluctuations.
۲۹۴۰.

طراحی نیروگاه 0/5 مگاواتی فتوولتاییک متصل به شبکه در پردیس دانشگاهی(مقاله علمی وزارت علوم)

حوزه‌های تخصصی:
تعداد بازدید : ۵۶۲ تعداد دانلود : ۵۹۲
در استفاده از بام ساختمان ها با معماری پایدار به عنوان نیروگاه فتوولتاییک هندسه ی ساختمان نقش اساسی دارد؛ دیوار های جنوبی در ساختمان دانشکده کشاورزی دانشگاه تربیت مدرس امکان مناسبی در تولید توان در فصول زمستان و در ساعات اداری(9 صبح تا 15 بعدازظهر) دارند. نرم افزار SketchUp و HelioScope راهنمای مناسبی جهت تعیین مسیر سایه ها در طول سال می باشد. داده های هواشناسی ایستگاه آکوستیک مهرآباد و ایستگاه مجازی ناسا با دقت بالا قابل استفاده هستند. نیروگاه با داده های ایستگاه هواشناسی مهرآباد با عملکرد 7/78 % می تواند سالانه 3/735مگاوات و با توجه به ایستگاه مجازی ناسا با عملکرد 8/79 % معادل 7/724مگاوات تولید توان داشته باشد. بیشترین اتلاف توان در بخش دما و کمترین آن مربوط به سیم کشی و عدم تطابق اینورتر می باشد.

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