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All Journal Dinamika Akuntansi Keuangan dan Perbankan Jurnal Ilmiah Telaah Manajemen Jurnal Bisnis dan Ekonomi Proceeding Fakultas Ekonomi Media Ekonomi dan Manajemen Students´ Journal of Economic and Management Proceeding SENDI_U PROCEEDINGS J-MAS (Jurnal Manajemen dan Sains) Ensiklopedia of Journal International Journal of Economics, Business and Accounting Research (IJEBAR) Jurnal PKM Manajemen Bisnis International Journal of Multidisciplinary Sciences and Arts IECON: International Economics and Business Conference
Agung Nusantara
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PENGARUH PENGGUNAAN LIMBAH BETON SEBAGAI SUBSTITUSI AGREGAT KASAR TERHADAP KUAT TEKAN BETON Nusantara, Agung; Mulyati, Ely
Ensiklopedia of Journal Vol 7, No 4 (2025): Vol. 7 No. 4 Edisi 1 Juli 2025
Publisher : Lembaga Penelitian dan Penerbitan Hasil Penelitian Ensiklopedia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33559/eoj.v7i4.3060

Abstract

This study aims to The Effect of Using Concrete Waste as a Coarse Aggregate Substitute on Concrete Compressive Strength. To find out whether concrete waste can be used as a good coarse aggregate substitute in Fc` 26.4 MPa concrete. And To find out how much compressive strength value is produced using concrete waste. At all test ages (7, 14, and 28 days), the concrete mixture with 30% concrete waste showed a consistent increase in compressive strength compared to normal concrete. This shows that the use of concrete waste as a coarse aggregate substitute with a percentage of 30% can increase the compressive strength of Fc 26 MPa concrete. Variations in the mixture of 10% and 70%, concrete waste did not provide better compressive strength results compared to normal concrete. Even the percentages of 10% and 70% tend to reduce the compressive strength of concrete. This study shows that the use of concrete waste as a coarse aggregate substitute in Fc 26 MPa concrete provides variations in the compressive strength of concrete at the ages of 7, 14, and 28 days. Specifically, the variation of 30% waste concrete mixture resulted in an increase in the compressive strength of concrete compared to normal concrete at each test age. At the age of 7 days, the compressive strength of normal concrete was 17.12 MPa, while the compressive strength with 10% LB was 16.94 MPa, 30% LB was 17.69 MPa and 70% LB was 16.60 MPa. At the age of 14 days, the compressive strength of normal concrete was 22.79 MPa, while the compressive strength with 10% LB was 21.73 MPa, 30% LB was 23.22 MPa and 70% LB was 21.52 MPa. At the age of 28 days, the compressive strength of normal concrete was 25.78 MPa, while the compressive strength with 10% LB was 25.17 MPa, 30% LB was 26.53 MPa and 70% LB was 24.96 MPa.Keywords: Concrete, Aggregate, Compressive Strength.
The Influence of Oil Prices, Gold Prices, and Inflation on the Indonesian Sharia Stock Index 2021-2025 Nawatmi, Sri Nawatmi; Nusantara, Agung; Maskur, Ali; Setiawan, Mulyo Budi
International Journal of Multidisciplinary Sciences and Arts Vol. 4 No. 3 (2025): International Journal of Multidisciplinary Sciences and Arts, Article July 2025
Publisher : Information Technology and Science (ITScience)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47709/ijmdsa.v4i3.6439

Abstract

As is known, the stock price index always fluctuates. Fluctuations are sometimes high, sometimes low, and sometimes it is difficult to predict the rise and fall of the stock index. Therefore, the purpose of this study is to determine how the variables of world oil prices, world gold prices and inflation affect the Indonesian sharia stock index (ISSI). The type of data is secondary data. The data taken is time-series data, the time period January 2021 - February 2025. The dependent variable is ISSI, while the independent variables are world oil prices, world gold prices and inflation. Data sources come from BPS (Central Statistics Agency), BI (Bank Indonesia) and investing.com. The analysis method used is the OLS (Ordinary Least Square) method with multiple linear regression techniques. Before analyzing, classical assumption detection was carried out starting from the detection of normality, multicollinearity, heteroscedasticity and autocorrelation. The estimation results show that the world oil price variable does not affect the movement of the ISSI, while the world gold price and inflation have a positive effect on the Indonesian sharia stock index.
GDP and CO₂ Emissions in ASEAN-5: Has the Turning Point Been Reached? Agung Nusantara; Nurhayati; Diah Amelia Azzahra; Suharti; M. Rully Sjahirul Alim; Paramitha Maylina Afifah
IECON: International Economics and Business Conference Vol. 3 No. 2 (2025): International Conference on Economics and Business (IECON-3)
Publisher : www.amertainstitute.com

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Abstract

Rapid economic growth and urbanization in Southeast Asia have increased environmental pressures, particularly through rising carbon dioxide (CO₂) emissions driven by fossil fuel–based activities. The Environmental Kuznets Curve (EKC) framework is commonly used to assess whether economic growth eventually leads to lower emissions after surpassing a certain income level. This model is particularly relevant for ASEAN countries—Indonesia, Malaysia, Thailand, the Philippines, and Vietnam—that are undergoing industrial transition. This study examines the presence of the EKC in the ASEAN-5 from 1990 to 2021 and estimates the turning point for each country. Using unbalanced annual panel data, a quadratic regression model is applied through Pooled OLS, Fixed Effects, and Random Effects methods. Model selection follows Chow and Hausman tests, with robustness diagnostics including heteroskedasticity (Breusch-Pagan), residual normality (Jarque-Bera), and cross-sectional dependence (Pesaran CD and LM tests). Turning points are calculated when the GDP coefficient is positive and the squared GDP coefficient is negative and statistically significant, indicating an inverted-U relationship. Results confirm that CO₂ = f (GDP, GDP²) is a valid specification for the region, reflecting a general shift toward greener economies. However, only Malaysia and Thailand have passed their respective turning points; Indonesia, the Philippines, and Vietnam remain below. These findings highlight the varying stages of environmental transition among ASEAN countries and underscore the urgent need for energy reform and policy interventions in nations that have not yet reached the emissions-reducing phase of economic development.
THE ROLE OF GOLD AS SAVE HAVEN OR DIVERSIFIER INVESMENT IN INDONESIA Nawatmi, Sri; Santosa, Agus Budi; Nusantara, Agung
International Journal of Economics, Business and Accounting Research (IJEBAR) Vol 8 No 2 (2024): IJEBAR, VOL. 08 ISSUE 02, JUNE 2024
Publisher : LPPM ITB AAS INDONESIA (d.h STIE AAS Surakarta)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29040/ijebar.v8i2.13955

Abstract

This research is based on the phenomenon of increasing gold transactions in the early 2020 pandemic as an alternative investment. This study aims to answer whether gold acts more as an alternative investment tool or as a diversifier, or is it still relevant as a hedging tool or a safe haven. This study will explore a number of main variables, namely: gold prices, investment interest rates, liquid stock prices, exchange rates and consumer price levels. The data analysis is time-series data with a time span of January 2018 to October 2020. The analytical method used is pairwise correlation and cross-correlation. The results showed, through pairwise correlation analysis, it can be concluded that the gold price variable is more worthy of being called a good store of value or safe haven than its role as an alternative investment or diversification. On the other hand, based on a cross-correlation analysis involving time-lag, the gold price expectation variable for next year has a strong complementarity with the expected investment interest rate variable as well as the expected exchange rate variable. Meanwhile, the relationship between the expected gold price variable and the expected liquid stock price variable, which is often used as an investment tool indicator, has a very strong substitution or diversification relationship.
Co-Authors Agus Budi Santosa Agus Budi Santosa Ali Maskur Diah Amelia Azzahra Fauziana, Indah Firdaus Firdaus Jatmiko, M.Roby M. Rully Sjahirul Alim Martini Martini Martono Martono Mohammad Fauzan Mulyati, Ely Mulyo Budi Setiawan Nabella Permatasari, 13.05.51.0186 Nabella Permatasari, 13.05.51.0186 Nawatmi, Sri Nawatmi Nofikasari, Nofikasari Nurhayati Nurhayati Nurhayati Nurrahmah, Wa Ode Sitti Paramitha Maylina Afifah Sri Fadilah Sri Isnowati Sri Nawatmi Suharti Widyastuti, Ariyani