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  • Universitas Gadjah Mada  (4)
  • 2020-2024  (4)
  • 1
    Online Resource
    Online Resource
    Universitas Gadjah Mada ; 2022
    In:  Journal of Applied Geology Vol. 7, No. 1 ( 2022-06-28), p. 25-
    In: Journal of Applied Geology, Universitas Gadjah Mada, Vol. 7, No. 1 ( 2022-06-28), p. 25-
    Abstract: The excavated slope of the diversion tunnel outlet at the Leuwikeris Dam was designed based on core test data and the Circular Failure Chart (CFC) method. Stability of the excavated slope under static and seismic loads has not been verified using a different method. The objective of this research was to evaluate performance of the excavated slope under static and seismic loads using the finite element method (FEM).  Stability analyses of the natural slope were also carried out to assess the improved stability of the slope after excavation. Geological mapping, examinations of drill cores and borehole logs, and laboratory tests were conducted to characterise the soils and rocks comprising the tunnel outlet slope. The rock masses were characterised using the Geological Strength Index (GSI) for the input parameters of the Generalised Hoek-Brown criterion. The slope stability analyses under static and seismic loads were performed using the finite element-based computer package RS2. The results show that the diversion tunnel construction site consists of residual soil and very poor to fair quality andesite breccia rock and tuff breccia with thin claystone intercalation. The groundwater table was located approximately 40 m below the ground surface. In general, the seismic load reduced stability of the slopes. The critical strength reduction factor (SRF) values of the natural portal slope, which had 40º inclination, were 3.6 and 1.45 under static and seimic loads, respectively. Meanwhile, the SRF values of the excavated slope, which had seven benches and 55 to 74º inclinations, were 3.83 and 1.78 under static and seismic loads, respectively. The natural and excavated slopes were considered stable under static and seismic loads and met the stability criteria specified by the National Standardization Agency (2017). The slope design increased the slope FS values by 6% and 20% under static and seismic loads, respectively.
    Type of Medium: Online Resource
    ISSN: 2502-2822 , 2086-5104
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2022
    detail.hit.zdb_id: 2975064-7
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  • 2
    Online Resource
    Online Resource
    Universitas Gadjah Mada ; 2022
    In:  Jurnal Sain Veteriner Vol. 40, No. 1 ( 2022-04-19), p. 32-
    In: Jurnal Sain Veteriner, Universitas Gadjah Mada, Vol. 40, No. 1 ( 2022-04-19), p. 32-
    Abstract: Ascaridia galli worm was chicken parasite that inflicted significant economic loss for breeders. Expensive commercial anthelmintic drug and drug resistance were the reasons why herbal anthelmintic study became strategic. The study aimed at finding out the effect of the application of turmeric (Curcuma domestica) extract in vivo on the number of eggs per gram (EPG) in feces. It used 30 free ranging chickens that were classified into 2 groups of 5 chickens with 3 repetitions. Group I served as control (Aquadestilata) and group II was treated using turmeric extract at the concentration of 2%, 3 times a week. Observation was conducted on days 1, 7, 14, 21, and 28. The results were then analyzed using Anova and advanced LSD test. The results of in vivo test showed that the application of the turmeric significantly decreased the number of the EPG as compared to negative control. The application of the turmeric had anthelmintic potential and significant effect on the decrease in the number of the EPG.
    Type of Medium: Online Resource
    ISSN: 2407-3733
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    Universitas Gadjah Mada ; 2021
    In:  Jurnal Kajian Seni Vol. 7, No. 2 ( 2021-04-29), p. 213-
    In: Jurnal Kajian Seni, Universitas Gadjah Mada, Vol. 7, No. 2 ( 2021-04-29), p. 213-
    Type of Medium: Online Resource
    ISSN: 2356-3001 , 2356-296X
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Universitas Gadjah Mada ; 2024
    In:  Indonesian Journal of Geography Vol. 56, No. 1 ( 2024-03-30), p. 148-
    In: Indonesian Journal of Geography, Universitas Gadjah Mada, Vol. 56, No. 1 ( 2024-03-30), p. 148-
    Abstract: The Mahakam Delta is a strategic industrial area in East Kalimantan, Indonesia, in which oil and gas industries reduce ambient air quality and generate excessive noise. This research aimed to analyze the ambient air and noise pollution attributed to oil and gas production activities in the delta. Relevant parameters at five sampling points (UA-02 to UA-06) were measured and further analyzed in the laboratory, including total suspended particulate (TSP), SO2, Pb CO, NO2, O3, temperature, humidity, wind direction, wind speed, and noise. Indonesia’s air pollutant standard index (locally abbreviated as ISPU) with four parameters (CO, NO2, SO2, and O3) was used to determine the ambient air quality, and provisions written in the Decree of the Minister of Environment No. 50 Kep-48/MENLH/11/1996 were consulted for the noise quality assessment.  Results showed ISPU values in the range of 0–50 at the five sampling points, suggesting good ambient air quality and compliance with Government Regulation No. 22 of 2021. In addition, it was revealed that the noise parameter was lower than the upper threshold set in the Ministerial Decree, namely 65 dB. Nevertheless, monitoring air and noise quality at the main pollutant sources should be regulated through policies and implemented to protect the public from exposure to potential pollutants.
    Type of Medium: Online Resource
    ISSN: 2354-9114 , 0024-9521
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2024
    SSG: 14
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