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  • 1
    Online Resource
    Online Resource
    Numerical Analyses of Tunnel Outlet Slope at Leuwikeris Dam, West Java, Indonesia
    Universitas Gadjah Mada ; 2022
    In:  Journal of Applied Geology Vol. 7, No. 1 ( 2022-06-28), p. 25-
    Details
    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
    URL: Article
    DOI: 10.22146/jag.69701
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2022
    detail.hit.zdb_id: 2975064-7
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  • 2
    Online Resource
    Online Resource
    THE VALIDITY OF FNAA AND AAS METHOD FOR ANALYSIS OF Cu AND Fe ELEMENTS IN BIOTA SAMPLES
    Universitas Gadjah Mada ; 2010
    In:  Indonesian Journal of Chemistry Vol. 9, No. 2 ( 2010-06-22), p. 236-242
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 9, No. 2 ( 2010-06-22), p. 236-242
    Abstract: The validity test of Fast Neutron Activation Analysis (FNAA) and Atomic Absorption Spectrometry (AAS) method for analysis of Cu and Fe elements in biota samples has been done. The validity test was represented by the validation test, homogenous test, Z-score test, t test and F test for both methods. The respective validity test results for Cu and Fe elements show that the FNAA precision test were 2.28% and 2.96% while the accuracy were 98.07% and 98.55%, and the precision of AAS validation test results were 1.72% and 2.29% and the accuracy were 98.50% and 98.35%. The uncertainty results for Cu and Fe by FNAA were 2.74% and 3.42%, while AAS were 2.98% and 3.73%. The limit of detection  for both methods of Cu and Fe were 1.05 µg/g and 1.35 µg/g, while AAS were 0.05 µg/g  and 0.904 µg/g, and the value of Z-score in the range ≥-2 and ≤+2 for both methods. In this case the precision, accuracy, uncertainty, limit of detection and value Z-score on both methods  are valid or property to be applied for element analysis. After FNAA and AAS methods were validated then were applied for determining of element contents in biota samples. From the homogenous test result was found that the samples of biota is homogeny, while t test shows that there is no significant difference in average concentration, F test of both methods shows that there is no difference in accuracy.   Keywords: The validity test, FNAA and AAS, Cu and Fe, biota samples
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.21536
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2010
    detail.hit.zdb_id: 3069950-2
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  • 3
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    Online Resource
    THE ANTHELMINTIC POTENTIAL OF TURMERIC (Curcuma domestica) EXTRACT AGAINST Ascaridia galli WORMS IN CHICKENS In Vivo
    Universitas Gadjah Mada ; 2022
    In:  Jurnal Sain Veteriner Vol. 40, No. 1 ( 2022-04-19), p. 32-
    Details
    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
    URL: Article
    DOI: 10.22146/jsv.67911
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2022
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  • 4
    Online Resource
    Online Resource
    Water Molecular Adsorption on the Low-Index Pt Surface: A Density Functional Study
    Universitas Gadjah Mada ; 2018
    In:  Indonesian Journal of Chemistry Vol. 18, No. 2 ( 2018-05-30), p. 195-
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 18, No. 2 ( 2018-05-30), p. 195-
    Abstract: We report the different way to explain the nature of water molecule (H2O) adsorption on the platinum (Pt) surfaces with low Miller index, i.e., (100), (110) and (111). Here, we perform periodic density functional theory (DFT) calculations to analyze the correlation between water-surface bonding strength and the observed charge transfer occurring in the systems. The results show that Pt-H2O interaction strength at the most stable adsorption sites, i.e., the atop site for each surfaces, follows the order of H2O/Pt(110) 〉 H2O/Pt(100) 〉 H2O/Pt(111). This order has the same pattern with the order of observed charge transfer contributed to the bonding formation. The differences in adsorption geometrical structures in these three surfaces are suggested to responsible for the order of bond strength since Coulomb interaction plays dominant roles in our electrostatic model. Furthermore, H2O-Pt interaction mechanism, which occurs through water 3a1 orbital releasing electron density (charge) followed by Pt-O bonding formation, is clarified.
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.24162
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2018
    detail.hit.zdb_id: 3069950-2
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  • 5
    Online Resource
    Online Resource
    ADSORPTION OF GIBBERELLIC ACID (GA〈sub〉3〈/sub〉) ONTO ACID ACTIVATED KAOLIN
    Universitas Gadjah Mada ; 2010
    In:  Indonesian Journal of Chemistry Vol. 10, No. 3 ( 2010-12-14), p. 320-326
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 10, No. 3 ( 2010-12-14), p. 320-326
    Abstract: Preparation, activation and adsorption study of natural kaolin from Tatakan, Tapin, South Kalimantan have been conducted. The activation of kaolin was done using 6 M HCl solutions at 90 °C for 3 h. The characterizations of kaolin were carried out by Fourier Transform Infrared, X-ray diffraction, and surface area analyzer. Adsorption parameters studied included the effect of pH, contact time, and concentration of gibberellic acid (GA3) onto kaolin samples. The amount of gibberellic acid adsorbed was determined using UV spectrophotometer. The adsorption capacity of kaolin was determined by Langmuir adsorption isotherm model. The result showed that activation of kaolin was resulted the larger specific surface area and more homogeneous composition of kaolin without any destruction of kaolin structure. Adsorption of gibberellic acid onto kaolin before and after activation showed that optimal adsorption was obtained at pH » 7 and reached the equilibrium within 4 h. The calculations result by Langmuir adsorption isotherm model showed that the increasing of adsorption capacity of acid activated kaolin is about 35%.
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.21437
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2010
    detail.hit.zdb_id: 3069950-2
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  • 6
    Online Resource
    Online Resource
    ADSORPTION OF GIBBERELLIC ACID ONTO NATURAL KAOLIN FROM TATAKAN, SOUTH KALIMANTAN
    Universitas Gadjah Mada ; 2010
    In:  Indonesian Journal of Chemistry Vol. 9, No. 3 ( 2010-06-24), p. 373-379
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 9, No. 3 ( 2010-06-24), p. 373-379
    Abstract: Adsorption of gibberellic acid (GA3) onto raw and purified kaolin from Tatakan, South Kalimantan was investigated in this study. Purification process was done by sedimentation to obtain relative pure kaolinite. Raw and purified kaolin samples were characterized by Fourier transformed infrared (FTIR) spectroscopy and X-ray diffractometer (XRD). The adsorption process was carried out in a batch system and the effect of pH, contact time and GA3 concentration were experimentally studied to evaluate the adsorption capacity. The amount of GA3 adsorbed was determined by UV spectrophotometer. The result showed that the raw kaolin from South Kalimantan consist of 53.36% kaolinite, 29.47% halloysite, 4.47% chlorite, 11.32% quartz and 1.38% christobalite and the purified kaolin consist of 73.03% kaolinite, 22.6% halloysite, 0.77% chlorite, 1.37% quartz and 2.23% christobalite Adsorption experimental indicate that the optimum adsorption took place at pH 7 and contact time for 4 h. Adsorption of GA3 was described by the Langmuir adsorption isotherm model with adsorption capacity of 8.91 mg/g on raw kaolin and 10.38 mg/g on purified kaolin.   Keywords: kaolin, gibberellic acid, adsorption
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.21501
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2010
    detail.hit.zdb_id: 3069950-2
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  • 7
    Online Resource
    Online Resource
    YOGYAKARTA AIR BORNE QUALITY BASED ON THE LEAD PARTICULATE CONCENTRATION
    Universitas Gadjah Mada ; 2010
    In:  Indonesian Journal of Chemistry Vol. 9, No. 3 ( 2010-06-24), p. 425-431
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 9, No. 3 ( 2010-06-24), p. 425-431
    Abstract: Analysis of Yogyakarta air quality based on concentration of lead particulate using Fast Neutron Activation Analysis (FNAA) method has been done. The sample was taken 3 times in 16 strategic locations of Yogyakarta city using Hi-Vol air sampler that equipped with cellulose filter TFA 2133. The sample irradiated for 30 min with 14 MeV fast neutron and then counted using gamma spectroscopy (AccuSpec). The result indicated that concentration of Pb-208 along Diponegoro street up to Janti street respectively are minimally (0.689 - 0.775) mg/m3, and maximally:  (1.598 - 1.785) mg/m3. According to DIY governor decree No. 153/2002 about the limited toxicity ambient on Yogyakarta area it is concentration that Pb. The concentration of Pb-208 are still below the permitted value of 2 mg/m3, but in certain areas, the Pb concentration is almost equal to upper limit of permitted concentration of Pb.   Keywords: air borne, neutron generator, FNAA
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.21510
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2010
    detail.hit.zdb_id: 3069950-2
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  • 8
    Online Resource
    Online Resource
    DETERMINATION OF LIMIT DETECTION OF THE ELEMENTS N, P, K, Si, Al, Fe, Cu, Cd, WITH FAST NEUTRON ACTIVATION USING NEUTRON GENERATOR
    Universitas Gadjah Mada ; 2010
    In:  Indonesian Journal of Chemistry Vol. 6, No. 2 ( 2010-06-14), p. 170-174
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 6, No. 2 ( 2010-06-14), p. 170-174
    Abstract: Determination of limit detection of the elements N, P, K, Si, Al, Fe, Cu, Cd, with fast neutron activation using neutron generator has been done.  Samples prepared from SRM 2704, N, P, K elements from MERCK, Cu, Cd, Al from activation foil made in San Carlos, weighted and packed for certain weight then iradiated during 30 minutes with 14 MeV fast neutron using the neutron generator and then counted with gamma spectrometry (accuspec).  At this research condition of neutron generator was set at current 1 mA that produced neutron flux about 5,47.107 n/cm2.s and  experimental result shown that the limit detection for the elements N, P, K, Si, Al, Fe, Cu, Cd are  2,44 ppm, 1,88 ppm, 2,15 ppm, 1,44 ppm, 1,26 ppm, 1,35 ppm, 1,05 ppm, 2,99 ppm, respectively.  The data  indicate that the limit detection or sensitivity of appliance of neutron generator to analyze the element is very good, which is feasible to get accreditation AANC laboratory using neutron generator.   Keywords: limit detection, AANC, neutron generator
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.21755
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2010
    detail.hit.zdb_id: 3069950-2
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  • 9
    Online Resource
    Online Resource
    Synthesis and 〈i〉In Vitro〈/i〉 Evaluation of C-methylcalix[4]resorcinaryl octacinnamate and C-methylcalix[4]resorcinaryl octabenzoate as the Sunscreen
    Universitas Gadjah Mada ; 2017
    In:  Indonesian Journal of Chemistry Vol. 17, No. 1 ( 2017-04-01), p. 63-
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 17, No. 1 ( 2017-04-01), p. 63-
    Abstract: The present study was aimed to synthesize and evaluate sunscreen activity of C-methylcalix[4]resorcinaryl octacinnamate and C-methylcalix[4] resorcinaryl octabenzoate. The target compounds were synthesized in 2 steps. They were a synthesis of C-methylcalix[4]-resorcinarene via acid catalyzed the condensation of resorcinol and acetaldehyde by using HCl catalyst, followed by esterification using cinnamoyl chloride and benzoyl chloride. The characterization of the target compounds was performed by IR, 1H-NMR, 13C-NMR, and LC-MS spectrometers. The sunscreen acti vity test was conducted by spectroscopic method and MTT-assay. Commercial sunscreen p-amino benzoic acid (PABA) was used as a comparator to the MTT assay. The sunscreen activity test used spectroscopic showed that C-methylcalix[4]resorcinaryl octacinnamate and C-methylcalix[4] resorcinaryl octabenzoate can absorb the ultraviolet radiation between 280 and 320 nm (UV-B) with the maximum absorption at 290 nm (ε = 31.535 M-1 cm-1) and 282 nm (ε = 42.217 M-1 cm-1), respectively. The results of MTT-assay indicated that the IC50 of C-methylcalix[4]resorcinaryl octacinnamate, C-methylcalix[4] resorcinaryl octabenzoate and PABA are 12.006, 20.568 and 12.564 ppm, respectively, it means that the order of sunscreen activity is C-methylcalix-[4]resorcinaryl octacinnamate, PABA and C-methylcalix[4] resorcinaryl octabenzoate.
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.23575
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2017
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  • 10
    Online Resource
    Online Resource
    COMPARISON TEST OF FNAA AND AAS METHOD FOR Cu, Cd, Cr, AND Pb ANALYSIS OF CODE RIVER SEDIMENT (INDONESIA)
    Universitas Gadjah Mada ; 2010
    In:  Indonesian Journal of Chemistry Vol. 8, No. 2 ( 2010-06-17), p. 158-162
    Details
    In: Indonesian Journal of Chemistry, Universitas Gadjah Mada, Vol. 8, No. 2 ( 2010-06-17), p. 158-162
    Abstract: Comparison test of Fast Neutron Activation Analysis (FNAA) and Atomic Absorption Spectrometry (AAS) method for analysis of Cu, Cd, Cr, Pb elements in Code river sediment samples has been done. Comparisons of test used Standard Reference materials (SRM) sample, covering the validation test, t test and F test for both method and then these methods were used to analyze the Code river sediment samples. Comparisons test result show that the validity of both method are around 92.69 % to 98.12 % and t test show that there is no significant difference in average concentration, F test of both methods show that there is no difference in accuracy. The analysis  result of Code sediment using FNAA for Cu, Cd, Cr, Pb are (15.41 - 53.92) ppm, (1.82 - 3.66) ppm, (14.72 - 87.28) ppm, (18.23 - 109.31) ppm respectively, while those using AAS method are (13.71 - 51.11) ppm, (1.64 - 3.33) ppm, (12.81 - 86.75) ppm, (15.74 - 105.53) ppm, respectively. Statistic result test using ANOVA method showed that the concentration of Cr are not significantly differences within sampling locations, while those for Cd, Cr, Pb show a significant difference within sampling location   Keywords: FNAA, AAS, Cu, Cd, Cr, Pb, sediment samples
    Type of Medium: Online Resource
    ISSN: 2460-1578 , 1411-9420
    URL: Article
    DOI: 10.22146/ijc.21634
    Language: Unknown
    Publisher: Universitas Gadjah Mada
    Publication Date: 2010
    detail.hit.zdb_id: 3069950-2
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