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All Journal Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia Jurnal Sains dan Teknologi Jurnal Kimia Mulawarman Al-Kimia JURNAL MANAJEMEN AKUNTANSI (JUMSI) Parameter: Journal of Statistics
Ramadani, Kurnia
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Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Mathematics

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PENGARUH GAYA KEPEMIMPINAN, KESEHATAN KERJA, DISIPLIN KERJA, DAN LINGKUNGAN KERJA TERHADAP TINGKAT SEMANGAT KERJA PADA KARYAWAN PT. MASTER CASH AND KREDIT RANTAU PRAPAT KABUPATEN LABUHANBATU Ramadani, Kurnia
JURNAL MANAJEMEN AKUNTANSI (JUMSI) Vol 1, No 1: JANUARI 2021
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

PT Master cash and credit which is located on Jln.SM.Raja Simpang Mangga in carrying out its activities requires a lot of factors and factors encourage a job so that the work can be done well with enthusiasm and goals that will be realized and carried out properly such as This is because the company needs a good leadership style and the work health of every employee and work discipline so that all are properly directed and comply with the rules that exist in the company and the work environment which greatly affects every company and good working morale. The purpose of this study was to determine the effect of leadership style, occupational health, work discipline and work environment on the level of morale of employees of PT. Master cash and credit Rantauprapat using quantitative methods by distributing questionnaire data with a population of 40 people. The analysis technique used is Multiple Linear Regression with a significance level of 5%. The results of the study using Multiple Linear Regression Analysis obtained a regression equation Y = 14.401 + 0.323X1 + 0.217X2 + 0.234X3 + 0.308X4, meaning that there is a positive and significant influence on Leadership Style, Occupational Health, Work Discipline and Work Environment on the Level of Morale. The simultaneous influence of Leadership Style, Occupational Health, Work Discipline and Work Environment on Work Morale Level with a significance value of 0.001 Work Spirit (Y) is influenced by the Variables of Leadership Style, Occupational Health, Work Discipline and Work Environment on Work Spirit Level of 34.4 %. While the remaining 65.6% is influenced by other factors.
PROTEASE ACTIVITY OF THERMOPHILIC BACTERIA FROM LEJJA HOT SPRINGS IN SOPPENG SOUTH SULAWESI Hafsan, Hafsan; Ramadani, Kurnia; Abbas, Abbas
JST (Jurnal Sains dan Teknologi) Vol 10, No 2 (2021)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (344.204 KB) | DOI: 10.23887/jst-undiksha.v10i2.38367

Abstract

This research aimed to observe quantitatively the effect of temperature and pH on protease activities from thermophilic bacteria collected from Lejja—Hot springs.  Spectrophotometry on the casein substrate was used to test the proteolytic activity of the crude protease.  Mixtures of enzyme and casein were incubated at various temperatures and pH for 20 minutes. The absorbance of tyrosine from protein hydrolysis was determined by spectrophotometry on λ 280 nm. Temperature and pH impacted on protease activity were determined at temperature (60; 65; 70; 75; 80; 85 and 90oC) and pH (6.0; 6.5; 7.0; 7.5; 8, 0; 8,5 and 9,0). Results showed that treatment of temperature variations and pH had a significant effect on protease activity. Crude extract of Bacillus licheniformis protease showed that the highest activity at 80oC and pH 7.5 was 0.1303 unit/ml/minute. Bacillus stearoformis showed the highest enzymatic activity of the protease at 85oC, and pH 7.5 was 0.1226 Unit/ ml/minute. In comparison, Bacillus coagulans reached optimum activity at 75oC, and pH 7.5 was 0.2052 Unit/ml/minute. Isolates of Bacillus licheniformis, B. coagulans and B. stearoformis are bacteria that produce thermostable protease enzymes that can be developed as a source of genes and as a producer of the enzyme itself.
Characterization of Hydroxyapatite of Chicken Eggshells Composite with Gelatin as Methylene Blue Absorbent Nurfadillah; Ramadani, Kurnia; Firnanelty; Chadijah, Sitti; Aisyah, Aisyah; Ilyas, Asriani; Nur, Arfiani; Adawiah, Syarifah Rabiatul; Andriani, Titik
Al-Kimia Vol 11 No 2 (2023): DESEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v11i2.40781

Abstract

Chicken egg shells contain an inorganic element (CaCO3) which has potency to be a source of calcium hydroxide (Ca(OH)2) which is then reacted with diammonium hydrogen phosphate ((NH4)2HPO4) as a phosphate precursor for hydroxyapatite synthesis. This study aims to determine the characterization of hydroxyapatite from eggshells and determine the absorbability of hydroxyapatite-gelatin composites against methylene blue. Synthesis of hydroxyapatite used precipitation method. The calcination results obtained calcium hydroxide (Ca(OH)2) content in the shell of 68.3%. Analysis of hydroxyapatite with Fourier Tranform Infra-Red (FT-IR) there was a wavenumber of 3434 cm-1 perform hydroxyl groups (-OH-), 1421 cm-1 carbonate groups (-CO3-2) and 1035 cm-1, 604 cm-1, 471 cm-1 phosphate groups (-PO4-2), and analysis by x-ray diffraction revealed that pure hydroxyapatite crystals had formed at an angle of 2Ɵ = 34,08 with crystallinity of 100%. The peaks that appear on the XRD diffractogram are adjusted to the Joint Committee on Power Diffraction Standards (JCPDS) No. 09-0432. The synthesis of HAp-gelatin composites obtained typical groups such as, amine groups from gelatin and phosphate groups and carbonates from Hap. The results of methylene blue absorption using hydroxyapatite-gelatin composites have obtained optimum conditions at a ratio of 2: 4 for 240 minutes with an efficiency of 63%. Based on these data, it reveals that the longer the time given, the greater the methylene blue absorbed
PENGARUH GAYA KEPEMIMPINAN, KESEHATAN KERJA, DISIPLIN KERJA, DAN LINGKUNGAN KERJA TERHADAP TINGKAT SEMANGAT KERJA PADA KARYAWAN PT. MASTER CASH AND KREDIT RANTAU PRAPAT KABUPATEN LABUHANBATU Ramadani, Kurnia
Jurnal Manajemen Akuntansi (JUMSI) Vol 1, No 1: 2021
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jumsi.v1i1.2139

Abstract

PT Master cash and credit which is located on Jln.SM.Raja Simpang Mangga in carrying out its activities requires a lot of factors and factors encourage a job so that the work can be done well with enthusiasm and goals that will be realized and carried out properly such as This is because the company needs a good leadership style and the work health of every employee and work discipline so that all are properly directed and comply with the rules that exist in the company and the work environment which greatly affects every company and good working morale. The purpose of this study was to determine the effect of leadership style, occupational health, work discipline and work environment on the level of morale of employees of PT. Master cash and credit Rantauprapat using quantitative methods by distributing questionnaire data with a population of 40 people. The analysis technique used is Multiple Linear Regression with a significance level of 5%. The results of the study using Multiple Linear Regression Analysis obtained a regression equation Y = 14.401 + 0.323X1 + 0.217X2 + 0.234X3 + 0.308X4, meaning that there is a positive and significant influence on Leadership Style, Occupational Health, Work Discipline and Work Environment on the Level of Morale. The simultaneous influence of Leadership Style, Occupational Health, Work Discipline and Work Environment on Work Morale Level with a significance value of 0.001 Work Spirit (Y) is influenced by the Variables of Leadership Style, Occupational Health, Work Discipline and Work Environment on Work Spirit Level of 34.4 %. While the remaining 65.6% is influenced by other factors.
Potential of Cow Bone as a Basic Material for Hydroxyapatite-High Density Polyethylene Composites (HAp-HDPE) Ramadani, Kurnia; Rismawati, Rismawati; Ismail, Ismail; Andriani, Titik
JURNAL KIMIA MULAWARMAN Vol 22 No 1 (2024)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v22i1.1363

Abstract

Cow bone has the potential to be used as a basic ingredient in the synthesis of hydroyapatite because it contains calcium. The addition of High Density Polyethylene (HDPE) to hydroyapatite aims to produce biocomposites that have better properties compared to the previous properties. The purpose of this study is to determine the characteristics of biocomposites with the HDPE:HAp in the ratio of 1: 2, 2: 1 and 3: 2 (%w / w). The method used is the sol-gel method and characterized by FTIR to see the bonding of functional groups and electron microscope to see the morphology of biocomposites. The biocomposites that have the best mechanical properties in this study are biocomposites with a ratio (HDPE: HAp) of 3: 2 with compressive and tensile strength values of 0.66 and 0.1290 N / mm2, density and water absorption values of 0.505 g / cm3 and 6,828% respectively and heat resistance with a temperature of 110 ° C experiencing a mass decrease of 0,675 g.
Evaluasi Kinerja Dye-Sensitized Solar Cell (DSSC) Terstabilkan dengan Pewarna dari Ekstrak Kulit Buah Solanum melongena L Aisyah, Aisyah; Halisa, Halisa; Ramadani, Kurnia; Firnanelty, Firnanelty; Zahra, Ummi; Nur, Arfiani; Patunrengi, Iswadi Ibrahim
Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia Vol 26, No 1 (2025): CHEMICA
Publisher : Jurusan Kimia FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/chemica.v26i1.73440

Abstract

Ekstrak kulit terong ungu telah banyak dikaji penggunaannya sebagai zat warna pada Dye-Sensitized Solar Cell (DSSC). Konversi foton menjadi energi listrik sangat ditentukan oleh kestabilan zat warna dan semikonduktor TiO2 selama proses absorpsi foton sinar matahari. Penelitian ini bertujuan untuk mengetahui potensi ekstrak kulit buah Solanum melongena yang distabilkan tingkat keasamannya sebagai zat warna pada DSSC. Ekstrak zat warna diperoleh melalui maserasi dengan metanol dan selanjutnya dikarakterisasi dengan Uji Fitokimia, Spektroskopi Uv-Vis dan FTIR. DSSC difabrikasi menggunakan zat warna tersebut pada semikonduktor TiO2 yang distabilkan oleh polivinil alkohol. Performa DSSC dievaluasi melalui pengukuran arus dan tegangan pada DSSC di bawah paparan sinar matahari secara langsung.  Hasil pengukuran arus tegangan menunjukkan bahwa ekstrak Solanum melongena yang distabilkan pada  pH 2 dapat meningkatkan nilai konversi energi sebesar 0,71%. Penstabilan semikonduktor TiO2oleh polivinil alkohol tidak berpengaruh signifikan pada peningkatan nilai konversi. Optimasi lebih lanjut dengan metode lain dan bersama faktor-faktor lainnya diharapkan dapat meningkatkan kestabilan dan nilai konversi energinya.Ekstrak kulit terong ungu telah banyak dikaji penggunaannya sebagai zat warna pada Dye-Sensitized Solar Cell (DSSC). Konversi foton menjadi energi listrik sangat ditentukan oleh kestabilan zat warna dan semikonduktor TiO2 selama proses absorpsi foton sinar matahari. Penelitian ini bertujuan untuk mengetahui potensi ekstrak kulit buah Solanum melongena yang distabilkan tingkat keasamannya sebagai zat warna pada DSSC. Ekstrak zat warna diperoleh melalui maserasi dengan metanol dan selanjutnya dikarakterisasi dengan Uji Fitokimia, Spektroskopi Uv-Vis dan FTIR. DSSC difabrikasi menggunakan zat warna tersebut pada semikonduktor TiO2 yang distabilkan oleh polivinil alkohol. Performa DSSC dievaluasi melalui pengukuran arus dan tegangan pada DSSC di bawah paparan sinar matahari secara langsung.  Hasil pengukuran arus tegangan menunjukkan bahwa ekstrak Solanum melongena yang distabilkan pada  pH 2 dapat meningkatkan nilai konversi energi sebesar 0,71%. Penstabilan semikonduktor TiO2 oleh polivinil alkohol tidak berpengaruh signifikan pada peningkatan nilai konversi. Optimasi lebih lanjut dengan metode lain dan bersama faktor-faktor lainnya diharapkan dapat meningkatkan kestabilan dan nilai konversi energinya.
WORLD GREENHOUSE GAS EMISSION CLASSIFICATION USING SUPPORT VECTOR MACHINE (SVM) METHOD Ramadani, Kurnia; Gustriza Erda
Parameter: Journal of Statistics Vol. 4 No. 1 (2024)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/27765660.2024.v4.i1.17051

Abstract

The phenomenon of Heatwaves has struck several countries across the globe due to climate change. This climate change has led to an increase in greenhouse gas emissions surpassing the limits set by the IPCC Fourth Assessment Report GWPs. This study utilizes the Support Vector Machine (SVM) classification method to identify and categorize greenhouse gas emission data from 1990 to 2020 using four kernels function such as linear, polynomial, radial basis function (RBF), and sigmoid. The SVM method demonstrates excellent performance in constructing classification models with a polynomial kernel function. This is evidenced by high values of training accuracy, testing accuracy, and F1-score, accompanied by short training and testing analysis times. Successively, these values are 97.39%, 97.69%, 96.82%, 0.59 seconds, and 0.22 seconds.
PROTEASE ACTIVITY OF THERMOPHILIC BACTERIA FROM LEJJA HOT SPRINGS IN SOPPENG SOUTH SULAWESI Hafsan, Hafsan; Ramadani, Kurnia; Abbas, Abbas
JST (Jurnal Sains dan Teknologi) Vol. 10 No. 2 (2021)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (344.204 KB) | DOI: 10.23887/jstundiksha.v10i2.38367

Abstract

This research aimed to observe quantitatively the effect of temperature and pH on protease activities from thermophilic bacteria collected from Lejja—Hot springs.  Spectrophotometry on the casein substrate was used to test the proteolytic activity of the crude protease.  Mixtures of enzyme and casein were incubated at various temperatures and pH for 20 minutes. The absorbance of tyrosine from protein hydrolysis was determined by spectrophotometry on λ 280 nm. Temperature and pH impacted on protease activity were determined at temperature (60; 65; 70; 75; 80; 85 and 90oC) and pH (6.0; 6.5; 7.0; 7.5; 8, 0; 8,5 and 9,0). Results showed that treatment of temperature variations and pH had a significant effect on protease activity. Crude extract of Bacillus licheniformis protease showed that the highest activity at 80oC and pH 7.5 was 0.1303 unit/ml/minute. Bacillus stearoformis showed the highest enzymatic activity of the protease at 85oC, and pH 7.5 was 0.1226 Unit/ ml/minute. In comparison, Bacillus coagulans reached optimum activity at 75oC, and pH 7.5 was 0.2052 Unit/ml/minute. Isolates of Bacillus licheniformis, B. coagulans and B. stearoformis are bacteria that produce thermostable protease enzymes that can be developed as a source of genes and as a producer of the enzyme itself.
Co-Authors Abbas Abbas, Abbas Aisyah Aisyah Arfiani Nur Asriani Ilyas Firnanelty, Firnanelty Gustriza Erda Hafsan, Hafsan Halisa, Halisa Ismail Ismail Nurfadillah Patunrengi, Iswadi Ibrahim Rismawati Rismawati Sitti Chadijah Syarifah Rabiatul Adawiah, Syarifah Rabiatul Titik Andriani, Titik Ummi Zahra, Ummi