Judul: Correlation between Physical Activity, Stress, and Consuming Habit of Caffeinated Beverages with Primary Dysmenorrhea of Female Adolescent
Abstrak: Remaja mengalami perkembangan biologis ditandai dengan menstruasi pertama yang dapat menyebabkan berbagai permasalahan termasuk dismenore primer. Tujuan penelitian ini adalah menganalisis hubungan aktivitas fisik, tingkat stres, dan kebiasaan konsumsi kafein dengan dismenore primer pada remaja putri di SMAN 1 Kebumen. Penelitian ini dilaksanakan pada bulan Januari-Februari 2022 pada 95 subjek dengan desain studi cross sectional. Pengambilan data dilakukan melalui pengukuran tinggi badan dan berat badan, wawancara, serta pengisian kuesioner meliputi SQ-FFQ (Semi Quantitative-Food Frequency Questionnaire), recall aktivitas fisik 2x24 jam, DASS-21 (Depression, Anxiety, and Stress Scale-21), karakteristik menstruasi subjek dan VAS (Visual Analogue Scale). Subjek sebagian besar berusia 16 tahun (43,2%) dengan status gizi normal (85,3%). Hasil analisis menunjukkan terdapat hubungan yang signifikan antara tingkat stres dengan dismenore primer (p =0,026, r=0,229). Tidak ada hubungan yang signifikan pada status gizi, aktivitas fisik, dan kebiasaan konsumsi kafein dengan dismenore primer (p>0,05)., Female adolescents experience biological development marked by the first menstruation which can cause various problems include primary dysmenorrhea. The aim of this study was to analyze the relationship between physical activity, stress levels, and caffeine consumption habits with primary dysmenorrhea in adolescent girls at SMAN 1 Kebumen. This study was conducted in JanuaryFebruary 2022 on 95 subjects with a cross sectional study. Data was collected by measuring height and weight, interviewing, and filling out questionnaires including SQ-FFQ (Semi Quantitative-Food Frequency Questionnaire), recall of physical activity 2x24 hours, DASS-21 (Depression, Anxiety, and Stress Scale21), the subject's menstrual characteristics and VAS (Visual Analogue Scale). Most of the subjects were 16 years old (43.2%) with normal nutritional status (85.3%). The results showed significant relationship between stress levels and primary dysmenorrhea (p=0.026, r=0.229). There was no significant relationship between nutritional status, physical activity, and caffeine consumption habits with primary dysmenorrhea (p>0.05).
Keyword: caffeine consumption habits, nutritional status, physical activity, primary dysmenorrhea, stress level

Judul: Hubungan status gizi, asupan zat gizi Mikro, dan Minuman Berkafein dengan Dismenorea primer pada Remaja putri di Sman 1 Pamekasan dan Sman 1 Galis
Abstrak: This study was aimed to analyze correlation of nutritional status, menstrual characteristics, food consumption, and caffeine beverages to primary dysmenorrhoea of adolescent school girls at urban and rural high school. A cross sectional study of 53 girls at SMAN 1 Pamekasan and 35 girls at SMAN 1 Galis was conducted. The sample was determined by Sample random sampling based on inclusion criteria. Correlation test showed there was no significant correlation between menstrual characteristics, nutritional status, and macronutrient to primary dysmenorrhoea (p>0.05). While there was significant correlation between intake of vitamin B1 and primary dysmenorrhoea (p<0.05) there was no significant correlation between Zn, vitamin E, vitamin B6, and caffeine beverages with primary dysmenorrhoea (p>0.05)., Penelitian bertujuan untuk menganalisis hubungan status gizi, karakteristik menstruasi, konsumsi pangan, dan minuman berkafein terhadap dismenorea primer pada remaja putri di SMA perkotaan dan SMA perdesaan. Desain penelitian yang digunakan adalah cross sectional dengan subjek penelitian yang digunakan dalam penelitian ini adalah 53 siswi SMAN 1 Pamekasan dan 35 siswi SMAN 1 Galis. Pengambilan sampel dengan cara Sample random sampling berdasarkan kriteria inklusi. Hasil uji korelasi antara karakteristik menstruasi, status gizi, dan zat gizi makro terhadap derajat dismenorea primer menunjukkan tidak terdapat hubungan yang signifikan (p>0.05). Sementara itu, terdapat hubungan yang signifikan antara asupan zat gizi mikro (vitamin B1) dan derajat dismenorea primer (p<0.05). Berbeda halnya antara Zn, vitamin E, vitamin B6, dan minuman berkafein terhadap derajat dismenorea primer yang menunjukkan tidak terdapat hubungan yang signifikan (P>0.05).
Keyword: dismenorea primer, kafein, menstruasi, status gizi

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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