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Áp dụng các phương pháp kiểm tra không phá hủy nhằm phát hiện ăn mòn dưới lớp cách nhiệt trên đường ống dầu khí tại Việt Nam

Trong khuôn khổ đề tài cấp bộ 2019-2020, Trung tâm Đánh giá không phá hủy (NDE) tiến hành nghiên cứu, thử nghiệm để thiết lập 04 quy trình kiểm tra không phá hủy (NDT) nhằm phát hiện CUI trên một số đường ống điển hình đang được sử dụng tại Việt Nam.

10/12/2021 6:27:02 PM +00:00

Tạp chí Khoa học và Công nghệ Hạt nhân: số 67/2021

Tạp chí Khoa học và Công nghệ Hạt nhân: số 67/2021 trình bày các nội dung chính sau: Thiết kế kênh đo thông lượng nơtron sử dụng buồng ion hóa KNK-3 tại lò phản ứng hạt nhân Đà Lạt; Kiểm chứng hệ mô phỏng tương tác chuyển tiếp thời gian thực cho lò phản ứng hạt nhân nghiên cứu Đà Lạt; Áp dụng phương pháp mô phỏng tôi kim tiến hóa trong thiết kế vùng hoạt lò phản ứng nhỏ 200MWt;...

10/12/2021 12:13:10 PM +00:00

Phương pháp tính toán bức xạ nhiệt mặt trời qua lớp kính bằng mô hình tương tự nhiệt điện

Bài viết trình bày phương pháp xác định dòng nhiệt bức xạ của mặt trời qua lớp kính trên cơ sở mô hình tương tự nhiệt điện. Kết quả nghiên cứu cho phép tính toán tổn thất nhiệt trong các không gian được làm lạnh do bức xạ từ môi trường bên ngoài. Từ đó làm cơ sở lựa chọn lớp vật liệu kính trong các kết cấu xây dựng, thiết bị công nghiệp để giảm tổn thất nhiệt do bức xạ gây ra.

10/12/2021 5:59:00 AM +00:00

Hiệu quả đun nước nóng bằng bơm nhiệt và bằng bơm nhiệt kết hợp năng lượng mặt trời so với dùng bình đun điện trở

Bài viết này trình bày việc tính toán hiệu quả năng lượng và khả năng giảm phát thải khí nhà kính khi đun nước nóng trong lĩnh vực dân dụng (tính cho 1 hộ gia đình có 4 người) bằng bơm nhiệt hoặc bằng bơm nhiệt kết hợp năng lượng mặt trời so với phương án dùng bình đun điện trở truyền thống. Kết quả tính toán cho thấy dùng phương án bơm nhiệt đơn thuần hoặc bơm nhiệt kết hợp năng lượng mặt trời có hiệu quả rõ rệt.

10/12/2021 5:58:53 AM +00:00

The black sea region energy cooperation: Current trends and prospects

The Black Sea region is one of the most complex regions in terms of energy development. It hosts several major powers and some developing countries that need to cut energy costs. In general, the region is controversial. It is influenced by external actors, and therefore regional stability is very difficult to achieve. In addition, institutional players such as the EU, the Belt and Road Initiative, the Black Sea Trade and Development Bank, etc., have their own vision of the future of the Black Sea region. The article is aimed at assessing the regional balance of power and estimating the interests of the countries of the region. Based on this assessment, the authors have classified the countries in the region, predicted potential alliances, and provided recommendations on how the countries should behave in the region.

10/12/2021 5:55:52 AM +00:00

The asymmetric effect of oil price on the exchange rate and stock price in Nigeria

The study examines the asymmetric effect of oil price on the exchange rate and stock price using the nonlinear autoregressive distributive lag (NARDL) technique on the time-series data spanning from January 1996 to September 2020. The multivariate cointegration test showed evidence of a longrun relationship among the stock price, exchange rate, and oil price. The linear Granger causality test showed that stock price is granger caused by oil price and exchange rate, and oil price is granger cause by stock price and exchange rate. The nonlinear granger causality showed evidence of nonlinearity using the BDS test.

10/12/2021 5:55:44 AM +00:00

State priorities in the petrochemistry of Russia: Sustainable development, “green” industry and energy efficiency

This research aims at diagnosing such priority areas for the development of petrochemicals in Russia as sustainable development and energy efficiency, at identifying trends and forecasting the development of the industry, taking into account the greening of the industry. Achieving the goal is based on the use of methods such as graphical, comparative, economic and mathematical (neural network modeling, correlation regression analysis), and prognostic.

10/12/2021 5:55:36 AM +00:00

Quadratic investment portfolio based on value-at-risk with risk-free assets: For stocks of the mining and energy sector

The mining and energy sector is still the driving force for economic development and community empowerment, especially around mining and energy activities. Therefore, increased investment in the mining and energy sectors needs to be increased and balanced with stricter safety and environmental policies. This paper aims to formulate a quadratic investment portfolio optimization model, and apply it to several stocks in the mining and energy sectors. In this paper, it is assumed that risk is measured using Value-at-Risk (VaR), so that the optimization modeling is carried out using the quadratic investment portfolio approach to the Mean-VaR model with risk-free assets. Furthermore, the model is used to determine the efficient portfolio surface based on several values of risk aversion levels.

10/12/2021 5:55:17 AM +00:00

Oil price volatility and renewable energy consumption in Nigeria

Oil price volatility is argued to be one of the incentives behind the rising prominence of renewable energy as a strategy to minimize oil dependence. Therefore, this study seeks to examine the impact of oil price volatility on renewable energy consumption in Nigeria from 1986-2017. A Vector Error Correction Model (VECM) was employed to achieve this objective. The variables were confirmed to exhibit a long run association. A unidirectional causality was also observed running from renewable energy consumption to oil price volatility. The impulse response function test shows that renewable energy consumption is positively influenced by oil price volatility in Nigeria.

10/12/2021 5:55:02 AM +00:00

Impacts of carbon pricing on developing economies

Carbon pricing is widely recognized as an effective policy instrument for climate change mitigation. Carbon pricing have been imposed in 39 developed countries and eight middle-income countries. Eight more middle-income countries are considering its implementation. As experiences from industrialized countries may not be relevant to developing countries, this literature review fills a knowledge gap by collating the impacts of carbon pricing in developing economies to facilitate cross-learning. Some developing countries still have distortionary subsidies in place, while others are going through environmental fiscal reforms to nudge their societies and economies towards greenhouse gases emission reduction. Various studies demonstrated that safeguards introduced with carbon pricing could help firms to transition while maintaining the motivation to innovate to stay competitive.

10/12/2021 5:54:22 AM +00:00

Modelling the impact of oil price on food imports: Case of oman

The purpose of this paper was to economically analyze and examine the causal relationship between food import bill and certain economic indicators in Oman during the period 1980-2019. The vector error correction model was used to assess the dynamics of food import bill. The finding indicates that food import bill in Oman is positively influenced by the population growth rate, and the GDP per capita, while oil prices showed a negative impact on food import bill. The error correction term suggesting 64% of the total disequilibrium in food import bill will be adjusted every year for any shock, justifiable for a dynamic economy like Oman.

10/12/2021 5:54:15 AM +00:00

Is trade openness the reason of high energy demand in China?

The present study aims to examine the short-run and long-run impact of China’s trade liberalization policies on its energy demand over the period from 1980 to 2018. The results of Autoregressive Distributed Lag approach of co-integration show that energy consumption significantly increases as a result of trade openness and increase in real Gross Domestic Product (GDP). The results of the granger causality test also confirm the unidirectional causality running from trade openness and real GDP to energy demand. The results of the study have an important implication because if China wants to continue its trade liberalization policies then it must increase its energy production.

10/12/2021 5:53:52 AM +00:00

Is nuclear power generation a viable alternative to the energy needs of Pakistan? SWOT-RII analysis

The present study has attempted to evaluate and investigate the prospects of nuclear power as a viable alternative in terms of energy security, reliability, and environmental sustainability with the SWOT tool. To further quantify the main drivers and barriers of nuclear energy, a Relative Importance Index (RII) analysis has been done. The results reveal that Pakistan has decades of experience running nuclear power plants satisfactorily. The regulatory framework for nuclear power generation is adequate to expand nuclear power generation. The opportunities are enormous to meet Sustainable Development Goal (SDG), as nuclear is a carbon-free source of energy. The main barriers are global suspicion of nuclear proliferation and less social acceptance.

10/12/2021 5:53:44 AM +00:00

How costly is energy conservation? The energy-GDP relationship re-examined for Turkey

In this study, using annual data between 1970 and 2019, it was investigated whether per capita energy consumption affects per capita income asymmetrically or not by using the NARDL model. The feature that makes this study different from similar studies is that it interprets the short and long-term asymmetric effects with the analysis model used and makes a unique contribution to the literature. The findings gave us the conclusion that income is affected in the same way by shocks experienced in energy consumption, and it has been observed that the effect of positive shocks is greater in the long run.

10/12/2021 5:53:37 AM +00:00

Futures trading, spot price volatility and structural breaks: Evidence from energy sector

The present study empirically examines the impact of Stock Futures on India’s underlying Energy Sector Stocks by incorporating the Structural breaks in the AR (1)-GARCH (1, 1) model. Although the issues relating to the effect of Derivatives trading on Cash Market Volatility have been empirically discussed in two ways: by evaluating Cash Market Volatilities during the Pre-and Post-Derivatives trading periods and, secondly, by determining the influence of Derivatives trading on the conduct of Cash Markets by comparing it with proxies.

10/12/2021 5:53:05 AM +00:00

Forecasting of biodiesel prices in Thailand using time series decomposition method for long term from 2017 to 2036

This paper presents the biodiesel prices in Thailand with the time series decomposition method. The source of time series data comes from the energy policy and planning office, Ministry of Energy of Thailand, monthly average retail price of regular-grade biodiesel, during 2007-2016, 120 months in total. This study aims to use forecasting methods to deter biodiesel prices in Thailand over the next 20 years, from 2017 to 2036. This solution starts with decomposing data into a trend, a cycle, seasonal, and any irregular components and then calculates biodiesel prices with a multiplicative model. The model shows a continuous decreasing trend of biodiesel prices from around 27.50 to 25.84 THB/liter in 2017 to 22.36 THB/liter in 2036. Moreover, the forecasting method has the least mean absolute present error (MAPE) at 0.24651.

10/12/2021 5:52:56 AM +00:00

(Nội dung trùng lắp) EFFECT OF TEMPERATURE AND RESIDENCE TIME ON PYROLYSIS OF RICE HUSK PELLET

EFFECT OF TEMPERATURE AND RESIDENCE TIME ON PYROLYSIS OF RICE HUSK PELLET

10/12/2021 5:52:47 AM +00:00

(Nội dung trùng lắp)Does Industry Specialist Auditor Provide More Insights in Their audit report? An Empirical Study of Key Audit Matters Section

Does Industry Specialist Auditor Provide More Insights in Their audit report? An Empirical Study of Key Audit Matters Section

10/12/2021 5:52:24 AM +00:00

(Nội dung trùng lắp) Does FDI and Corruption affect Environmental Quality in Tunisia?

Does FDI and Corruption affect Environmental Quality in Tunisia?

10/12/2021 5:52:13 AM +00:00

China and Russia Energy Strategy DevelopmentChina and russia energy strategy development: Arctic LNG

Nowadays, the LNG market is a derivative of the traditional gas market and has certain advantages over pipeline gas supplies. Many countries, including the Russian Federation, are trying to consolidate their positions in the relatively new and growing LNG market. In the paper, Sino-Russia Energy strategy perspectives until 2030 are being analyzed in detail. The authors analyze the Arctic LNG case as the most crucial for both countries’ collaboration. The Arctic is considered as the new strategic frontier of China. China is a critical Arctic stakeholder as it is written in the newly released white paper China’s Arctic Policy. The authors use Python 3.4. modeling for testing the influence of economic, social and environmental factors on Sino-Russia energy collaboration. The methodology consists of foresight analysis, including principal component isolation (further- PCA) method and SARIMA analysis.

10/12/2021 5:52:03 AM +00:00

EU Energy and climate policies: Challenges and opportunities for poland

Along with the observed in the second half of the 20th century progressing climate change and accelerating greenhouse gas emissions levels (GHGgreenhouse gases), the European Commission (EC) actively started to act, both internally and globally, against these adverse changes. This paper presents the current energy and climate policy of the European Union resulting from the long-term strategy based on developing low-carbon economy, and analyses its influence on energy transformation of the Polish economy. It contains results of analyses and assessments of the implementation process of energy and climate policy in the economy of Poland as an EU member, economic restructuring and it indicates challenges connected with the practical aspects of EU energy policy objectives implementation in the near future.

10/12/2021 5:51:37 AM +00:00

Estimating residential demand for water in Kuwait: A cointegration analysis

This paper aims to investigate the determinants of water demand in Kuwait and assess their impact on consumption. To do this, we applied the cointegration regression and the error correction model (ECM) on annual time series data, covering the period from 1972 to 2019. We found that the price elasticity for fresh water demand in Kuwait is negative and elastic in the long run (-1.095), which is consistent with the existing literature. Also, we found that the income elasticity for demand was positive in the long run (0.234), however, no short run effect was found for either price or income. Our results suggest that policymakers should expect a long run impact when using water prices to adjust the consumption behavior in Kuwait.

10/12/2021 5:51:31 AM +00:00

Equity and renewable energy: An analysis in residential users in the department of Atlántico-Colombia

Sustainable development has its complexity in seeking a balance between the three dimensions, renewable energies require an economic investment and are friendly to the environment; but due to socioeconomic differences, access and widespread use may be limited. Colombia has a subsidy mechanism according to socioeconomic strata, where the lower strata receive a reduction in the price of energy by a set amount of kWh, while the upper strata contribute a 20% of the final price. This research performs an economic evaluation due to the investment made in a photovoltaic system, considering socioeconomic factors; The results will make it possible to identify factors that affect equity and access to these technologies.

10/12/2021 5:51:24 AM +00:00

Energy management strategy in campus towards a green campus through promoting carbon footprint and energy efficiency index improving

The energy management strategy is the key to increasing the energy efficiency index (EEI) and controlling buildings’ carbon emissions. This article discusses the energy policy strategy at Siliwangi University based on four main components of green campus: the profile of the electricity load, energy consumption, the rate of the number of vehicles, and vehicle activity in the campus environment. We propose four scenarios to meet the EEI and carbon emissions standards in 2025. The analysis of carbon emission production uses the UI Green Metric approach by referring to the carbon emission strategy from the Climate Action Tracker (CAT) and the profile of the world bank.

10/12/2021 5:51:13 AM +00:00

Energy absorption, CO2 emissions and economic growth sustainability in Nigeria

Economic growth sustainability and environmental preservation have become a topical issue. This study emanates from the need to assess the starring role of energy ingestion in guaranteeing sustainable economic progression in Nigeria. The study investigates the influence of energy consumption and carbon dioxide emission on the economic growth of Nigeria from 2008 to 2019. In this study, we employ the multiple regression techniques to assess the impact of Electricity, CO2 , primary energy and total labour force on GDP. Various indicative checks show that the model is appropriate and errorfree. Out of the four energy sources examined, Electricity is found inconsequential in affecting the economic growth of Nigeria. The CO2 emission is positively significant, implying that the economy is growing with a high level of pollution in the environment.

10/12/2021 5:51:05 AM +00:00

Electricity consumption and manufacturing sector performance: Evidence from Nigeria

Adequate supply of energy is important for sustainable growth in an economy. The rate of the growth of the Nigeria’s electricity development is very slow and not effective compare to other emerging economies; this on the other hands has discouraged production, most especially in the manufacturing sector. In light of this, the study investigates the long-run impact of electricity consumption on manufacturing sector performance proxy by output, employment and capital using Canonical Cointegrating Regression for the period of 1981-2019. Evidence from the result in the output equation shows that electricity consumption and credit to manufacturing sector have a negative relationship with output. In the employment equation, consumption in electricity and interest rate have negative effects on employment.

10/12/2021 5:50:46 AM +00:00

Effect of temperature and residence time on pyrolysis of rice husk pellet

For each selected value of pyrolysis temperature, three levels of residence time for pyrolysis process were set as 0, 60 and 120 minutes, respectively. Some properties of the final product from the pyrolysis process i.e volatile, ash content, fixed-carbon and higher heating value (HHV) were measured. The experimental results have shown that in the current range of experimental work, charcoal products could get the highest fixed-carbon content at the pyrolysis temperature of 6000C and with the residence time of 120 minutes.

10/12/2021 5:50:40 AM +00:00

Domestic consumer awareness of energy consumption practices in Pakistan

The study concludes that unawareness is the key determinant that creates and strengthens a sense of irresponsibility in consumer behavior. The academician and practitioners need dire attention to take precautionary measures for developing prominent awareness campaigns and strategic policy guidelines to distort irresponsible human nature by including fearful promotional contents in marketing campaigns.

10/12/2021 5:50:23 AM +00:00