JOS - UNSOED (Jurnal Online Soedirman - Universitas Jenderal Soedirman)
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ASYMPTOTIC STUDY OF NONLINEAR SPRING OSCILLATION WITH EXTERNAL FORCE USING THE MULTIPLE TIME SCALES METHOD
No full textA nonlinear spring is a type of oscillator that does not follow Hooke's law perfectly. In mathematics, this type of oscillator can be modeled in a nonlinear ordinary differential equation. Of the many discussions on oscillation models, one examines the behavior of the model when disturbed by a parameter with a very small value. In this study, a discussion will be conducted regarding the behavior of the oscillation model with external forces added to the disturbance parameters in the damping and spring stiffness terms. To observe this behavior, one of the techniques in asymptotic analysis called the multiple time scales method is used. The results of this study will show the behavior of the oscillation model with the disturbance parameters caused by the resonance that occurs. To provide a clearer picture, the oscillations that occur are presented in the form of a simulation result graph, containing a comparison between the approximate solution and the numerical solution. Based on the discussion given, it is concluded that the oscillations in the model are strongly influenced by a certain relationship between the natural frequency of the nonlinear spring and the frequency of the external force acting on the model.Suatu pegas tak linier merupakan salah satu jenis osilator yang tidak mengikuti hukum Hooke secara sempurna. Dalam matematika, osilator jenis ini dapat dimodelkan dalam suatu persamaan diferensial biasa tak linier. Dari banyak diskusi yang membahas model osilasi, salah satunya mengkaji perilaku dari model ketika diganggu oleh suatu parameter yang bernilai sangat kecil. Pada penelitian ini akan dilakukan pembahasan mengenai perilaku dari model osilasi dengan gaya luar yang ditambahkan parameter gangguan pada suku redaman dan kekakuan pegas. Untuk melihat perilaku tersebut, digunakan salah satu teknik dalam analisis asimtotik yang disebut metode multiple time scales. Hasil dari penelitian ini akan menunjukkan perilaku dari model osilasi dengan parameter gangguan yang diakibatkan oleh resonansi yang terjadi. Guna memberikan gambaran yang lebih jelas, osilasi yang terjadi disajikan dalam bentuk grafik hasil simulasi, memuat perbandingan antara solusi hampiran dan solusi numerik. Berdasarkan pembahasan yang diberikan, disimpulkan bahwa osilasi pada model sangat dipengaruhi oleh hubungan tertentu antara frekuensi alami pegas tak linier dengan frekuensi gaya luar yang bekerja pada model
Analysis Analysis of the Implementation of Internal Control in Productive Waqf Management (Case Study: Nazir Waqf Mata Air)
No full textThis study aims to analyze the application of COSO-based internal control at Nazir Waqf Mata Air and to identify the obstacles encountered in its implementation. The study uses a qualitative method with a case study approach. Data are collected through in-depth interviews, observation, and documentation. The informants in this study consist of four individuals who are directly involved in managing productive waqf assets at Nazir Waqf Mata Air. The results show that, overall, the implementation of COSO-based internal control at Nazir Waqf Mata Air is carried out effectively. The obstacles encountered in the implementation of internal control are related to limited human resources and the underutilization of technology.This study aims to analyze the application of COSO-based internal control at Nazir Waqf Mata Air and to identify the obstacles encountered in its implementation. The study uses a qualitative method with a case study approach. Data are collected through in-depth interviews, observation, and documentation. The informants in this study consist of four individuals who are directly involved in managing productive waqf assets at Nazir Waqf Mata Air. The results show that, overall, the implementation of COSO-based internal control at Nazir Waqf Mata Air is carried out effectively. The obstacles encountered in the implementation of internal control are related to limited human resources and the underutilization of technology
Comparative solvent evaluation for protein extraction from Channa striata and development of a stable capsule formulation for nutritional supplementation
No full textBackground: Channa striata is a protein-rich freshwater fish with therapeutic potential, yet systematic optimization of extraction methods and stable formulation development remain limited.
Objective: To compare protein extraction efficiency using three solvents (1% HCl, 0.9% NaCl, and distilled water) and develop optimized capsule formulations.
Methods: Protein was extracted at 1:4 (w/v) ratio and quantified using the Lowry method at 595 nm. The method was verified for linearity (R = 0.998), accuracy (98-102%), and precision (RSD <2%). Extracts were formulated into capsules at 0, 300, 400, and 500 mg (F0-F3) and evaluated for quality parameters and 28-day stability at -4°C, 24°C, and 40°C. Data were analyzed using one-way ANOVA with Duncan's post-hoc test.
Results: The 1% HCl yielded highest protein content (4.947 ± 0.071 mg/mL) and extraction efficiency (21.390%) compared to 0.9% NaCl and distilled water (p <0.05). All formulations met pharmaceutical standards. Notably, F3 maintained protein retention >95% across all storage conditions (97.1-99.3%), while F0-F2 failed this criterion.
Conclusion: The 1% HCl demonstrated optimal extraction efficiency. F3 (500 mg) exhibited superior stability and dissolution characteristics, representing a promising candidate for C. striata-based nutritional supplements
Rekontekstualisasi Moderasi Beragama dan Transformasi Puritanisme Muhammadiyah dalam Mendukung Ketahanan Pangan dan Mobilitas Sosial
No full textThis article examines the role of Muhammadiyah in fostering a balanced economic order, tracing its trajectory from puritanical reasoning toward religious moderation. Muhammadiyah’s religious vision serves as a form of social capital that strengthens food security initiatives. This study is a library-based inquiry employing a philosophical–historical–critical approach. The chosen analytical framework is functionalism, which emphasizes impact and explores the interrelations between religious functions and work ethic. Within this framework, functionalism observes how Muhammadiyah’s puritanism is transformed into economic consciousness, ultimately producing concrete achievements through its charitable enterprises. The findings reveal that Muhammadiyah’s puritanism is dynamic rather than static. Its puritan impulses operate more actively in the social sphere than in the theological one. Its rejection of certain rituals and traditions reflects a refusal of inefficiency. Conversely, Muhammadiyah’s moderation strengthens ethos and action, cultivating balance between worldly and spiritual life, between the physical and the metaphysical, and between spiritual and material pursuits. For Muhammadiyah, the interpretation of Qur’anic verses is assessed through practice and the benefits they generate. This pragmatic religious orientation aligns with the character of urban Muslims and represents a geo-spiritual approach that contributes to social mobility within the community
Integrasi Sistem Pelayanan dan Pendidikan Kedokteran Gigi di Malaysia: Implikasi bagi Penguatan Sistem Kesehatan Gigi Indonesia
No full textLatar Belakang: Malaysia telah mencapai cakupan kesehatan universal sejak 1990-an dan menunjukkan peningkatan kesehatan rongga mulut melalui National Oral Health Plan 2022-2030. Keberhasilan ini didukung oleh sistem pelayanan yang komprehensif dan pendidikan kedokteran gigi yang mendorong kolaborasi interdisipliner serta pendekatan holistik. Pemahaman sistem pelayanan dan pendidikan kedokteran gigi di Malaysia menjadi pembelajaran penting bagi Indonesia dalam penguatan sistem kesehatan gigi dan mulut nasional. Metode: Penyusunan kajian literatur ini dilakukan melalui Google Scholar, PubMed, dan Cureus dalam 10 tahun terakhir menggunakan kata kunci “dental health care Malaysia”, “dental education Malaysia”, “health care system Malaysia” dan dihasilkan 23 artikel memenuhi kriteria inklusi. Hasil: Sistem kesehatan Malaysia didominasi sektor publik berbasis pajak dan sektor swasta dengan proporsi out of pocket yang tinggi. Pada layanan kedokteran gigi, sektor publik berfokus pada anak-anak dan kelompok rentan, sedangkan sektor swasta lebih banyak digunakan oleh orang dewasa. Dalam pendidikan, Malaysia menerapkan kurikulum berbasis kompetensi dengan penguatan praktik klinis dan pendekatan komunitas. Secara keseluruhan, perkembangan layanan dan pendidikan kedokteran gigi Malaysia menunjukkan kemajuan, meskipun akses dan pemerataan tenaga kesehatan menjadi tantangan. Kesimpulan: Integrasi kuat antara sistem pelayanan dan pendidikan kedokteran gigi di Malaysia meningkatkan mutu layanan kesehatan serta memberikan pembelajaran bagi Indonesia dalam mengintegrasikan pendidikan dengan pelayanan kesehatan.
Kata Kunci: Sistem kesehatan Malaysia, layanan kedokteran gigi, pendidikan kedokteran gig
Effect of Durian Rind Nanocellulose Addition on the Vickers Hardness of Self-Cure Acrylic Resin Fabricated By Spray-on Method
No full textSelf-cure acrylic resin is commonly used to fabricate orthodontic baseplates in removable appliances. However, it exhibits relatively low hardness, making it susceptible to wear and deformation under masticatory forces. The addition of reinforcing materials can enhance mechanical properties such as hardness. Nanocellulose derived from durian (Durio zibethinus Murr.) rind, an agricultural waste product, is a promising bio-based reinforcing material. This study aimed to determine the effect of durian rind nanocellulose addition on the Vickers hardness of self-cure acrylic resin fabricated using the spray-on method.This laboratory experimental study employed a posttest-only control group design. Durian rind nanocellulose was synthesized via acid hydrolysis and characterized using Transmission Electron Microscopy (TEM) and Fourier Transform Infrared Spectroscopy (FTIR) to confirm morphology and functional groups before incorporation into the acrylic resin. The nanocellulose was dispersed in monomer using ultrasonic homogenization for 5 minutes to ensure uniform distribution, then applied to polymer powder using the spray-on method. Twenty-four samples were divided into three groups (n=8): 2% nanocellulose, 3% nanocellulose, and control (0% nanocellulose). The highest mean hardness value was found in the 2% nanocellulose group (30.77 ± 1.03 VHN), while the lowest was in the control group (26.90 ± 0.79 VHN). Data were normally distributed and homogeneous (Shapiro-Wilk and Levene tests). One-way ANOVA revealed significant differences among groups (p<0.05), with post hoc LSD tests confirming significant pairwise differences. This study concludes that durian rind nanocellulose addition significantly increases the Vickers hardness of self-cure acrylic resin fabricated by the spray-on method compared to the control grou
Secondary Spontaneous Pneumothorax in Recurrent Pulmonary Tuberculosis: A Case Report
No full textBackground: Secondary spontaneous pneumothorax is a potentially life threatening complication that may occur in patients with underlying pulmonary diseases, including pulmonary tuberculosis. In recurrent pulmonary tuberculosis, residual lung damage such as cavitation, fibrosis, and bullae increases the risk of alveolar rupture, leading to pneumothorax. Objective: To describe the clinical presentation, diagnostic findings, management, and outcome of a patient with secondary spontaneous pneumothorax associated with recurrent pulmonary tuberculosis. Case Presentation: A 21 year old male with a history of pulmonary tuberculosis two years prior presented to the emergency department with sudden onset shortness of breath and pleuritic chest pain. Physical examination and chest radiography revealed an avascular radiolucent area in the right lung, consistent with pneumothorax. A rapid molecular sputum test was positive for Mycobacterium tuberculosis. A diagnosis of right sided secondary spontaneous pneumothorax due to recurrent pulmonary tuberculosis was established. The patient underwent needle decompression followed by the placement of a water sealed drainage (WSD) system. Anti tuberculosis therapy was reinitiated according to the national treatment protocol. Results: Follow up chest radiographs demonstrated progressive lung re expansion, accompanied by significant clinical improvement. The patient’s condition stabilized, and no further complications were observed during hospitalization. Conclusion: Secondary spontaneous pneumothorax in patients with recurrent pulmonary tuberculosis represents an emergency condition that requires rapid diagnosis and appropriate management. The combination of WSD insertion and anti tuberculosis therapy proved effective in promoting lung re-expansion and improving clinical outcomes. Heightened clinical awareness of this complication is essential to improve prognosis in patients with recurrent pulmonary tuberculosis
Ileal Atresia in a Preterm Neonate Complicated by Necrotizing Enterocolitis: A Case Report
No full textBackground: Ileal atresia is a congenital intestinal obstruction that frequently affects premature neonates and is associated with high morbidity, particularly when complicated by necrotizing enterocolitis (NEC) and sepsis. Optimal outcomes depend not only on surgical intervention but also on comprehensive perioperative management by a multidisciplinary team, particularly neonatologists. Case Presentation: We report a male preterm neonate born at 32 weeks and 5 days of gestation with progressive abdominal distension, bilious gastric residue, and failure to pass meconium. Initial respiratory distress improved with non-invasive ventilation. However, gastrointestinal deterioration occurred on day four of life, with radiographic findings consistent with NEC stage III and pneumoperitoneum. Emergency laparotomy revealed ileal atresia, and staged surgical management was performed. Discussion: The pediatric or neonatal team played a crucial role in preoperative stabilization, including respiratory support, fluid and electrolyte correction, broad-spectrum antibiotics, and nutritional optimization. Postoperatively, close monitoring of respiratory status, infection control, gradual advancement of enteral nutrition, and growth assessment enabled recovery without major complications. Full oral feeding was achieved, and the patient was discharged in stable condition on day 27 of life. Conclusion: This case highlights the pivotal role of pediatricians or neonatologists in perioperative management of ileal atresia in premature neonates, emphasizing that meticulous supportive care significantly contributes to favorable surgical outcomes
In Silico Analysis of Moringa oleifera Leaf Phytochemicals as Potential DNA Gyrase Inhibitor in Salmonella typhi
No full textSalmonella typhi is an infectious bacterium leading to typhoid fever, that is increasing in cases worldwide each year. Due to the resistance to antibiotics, the discovery of safer and efficacious drugs remains important. This study evaluates the potential interaction of M. oleifera phytochemical compounds against DNA gyrase of Salmonella typhi using an in silico molecular docking approach. Ligand’s phytochemicals were retrieved from the PubChem database, while the three-dimensional structure of DNA Gyrase subunit A and subunit B were obtained from the Protein Data Bank (PDB ID: 5ZJT and 6J90). Molecular docking was done using PyRx software and BIOVIA Discovery Studio as visualization software. Phytochemical compounds that had higher predictive binding affinity to DNA gyrase subunit A were Naringenin (∆G=-7.9 kcal/mol), 6-Prenylnaringenin (∆G=-8.1 kcal/mol), 6-Methoxypodophyllotoxin (∆G=-7.9 kcal/mol). Brefeldin A- DNA gyrase subunit A complex had the same binding affinity to ciprofloxacin (∆G=-7.7 kcal/mol). Phytochemical compounds that had higher predictive binding affinity to DNA gyrase subunit B were Naringenin (∆G=-8.9 kcal/mol), 6-Prenylnaringenin (∆G=-8.8 kcal/mol), 3',4'-Dimethoxy-7-hydroxyflavone (∆G=-8.6 kcal/mol), Sinapoyl malate (∆G=-7.8 kcal/mol), and Sinapoyl malate-4'-methyl ester (∆G=-8.3 kcal/mol). These findings suggest that phytochemical compounds from M. oleifera leaves may act as potential DNA gyrase inhibitors. However, further in vitro and in vivo validation is required to confirm its antibacterial activity.
 
CIGARETTE SMOKE EXPOSURE AND ACUTE RESPIRATORY INFECTIONS AS RISK FACTORS OF STUNTING IN CHILDREN UNDER FIVE YEARS
No full textIntroduction: Previous studies suggest that cigarette smoke exposure and acute respiratory infections (ARI) are considered contributing factors. We analyzed the risk of cigarette smoke exposure and ARI incidence in association with stunting in children under 5 years of age in an Indonesian rural setting where smoking and ARI prevalences are high. Methods: This is an observational analytical study with a case–control design. Secondary data on stunting were obtained from height measurements in March 2020, whereas data on cigarette smoke exposure and the incidence of ARI were the primary data obtained from interviews. Results: After adjusting for other variables in the multivariable analysis, high exposure of cigarette smoke exposure (OR = 9.85, 95% C1 = 2.23 – 43.48) and frequent ARI incidence (OR = 7.32. 95% CI = 1.42 – 37.68) still demonstrated a significant association with stunting in children under 5 years of age; history of low birth weight and family income were among the associated covariate variables. Conclusion: These findings are consistent with those of previous studies. Cigarette smoke exposure and acute respiratory infections are associated with stunting in children under 5 years of age. Further robust studies are essential to confirm these findings