Dynamic analysis and optimal control of COVID-19 with comorbidity: A modeling study of Indonesia

Comorbidity is defined as the coexistence of two or more diseases in a person at the same time. The mathematical analysis of the COVID-19 model with comorbidities presented includes model validation of cumulative cases infected with COVID-19 from 1 November 2020 to 19 May 2021 in Indonesia, followed by positivity and boundedness solutions, equilibrium point, basic reproduction number (R0), and stability of the equilibrium point. A sensitivity analysis was carried out to determine how the parameters affect the spread. Disease-free equilibrium points are asymptotically stable locally and globally if R0 < 1 and endemic equilibrium points exist, locally and globally asymptotically stable if R0 > 1. In addition, this disease is endemic in Indonesia, with R0 = 1.47. Furthermore, two optimal controls, namely public education and increased medical care, are included in the model to determine the best strategy to reduce the spread of the disease. Overall, the two control measures were equally effective in suppressing the spread of the disease as the number of COVID-19 infections was significantly reduced. Thus, it was concluded that more attention should be paid to patients with COVID-19 with underlying comorbid conditions because the probability of being infected with COVID-19 is higher and mortality in this population is much higher. Finally, the combined control strategy is an optimal strategy that provides an effective guarantee to protect the public from the COVID-19 infection based on numerical simulations and cost evaluations

SISTEM PENGELOLAAN REKAM MEDIS DI PUSKESMAS MLATI I KABUPATEN SLEMAN (Suatu Tinjauan Dari Aspek Manajemen Kearsipan)

The writing of this final report is still be series with The Field Work Practice conducted in Public Health Center of Mlati I of Sleman regency. The purpose of this Field Work Practice is how the Management of Medical Records in Public Health Center of Mlati I reviewed from aspects of records management, outlines the implementation of management of medical records of Public Health Center of Mlati I from viewpoint of records management. The methods of data collection which are implemented in the preparation of this final report are the literature study by the use of references to obtain the data in report writing, the observation by perform the observation and recording directly in Public Health Center of Mlati I, and interviews with the informant who is directly addressing the management of medical records in Public Health Center of Mlati I. The main conclusion of this report that the management of medical records in Public Health Center of Mlati I have done well, from the process of creating files of medical records, organizing the management of files of medical records, filing systems, equipment and supplies that used, the access service of files of medical records, the depreciation of files of medical records up to the use of a computerized system of management of files of medical records, the implementation of management of medical records that already support the smooth of working of Public Health Center of Mlati I. But in the process of depreciation of files of medical records especially the handling of files of medical records is inactive not run, the files of medical records after retention just stacked in the warehouse of Public Health Center of Mlati I

Nanofiber-enrich dispersed activated carbon derived from coconut shell for supercapacitor material

The high demand for supercapacitors has led to the importance of developing low-cost and eco-friendly materials. Instead of powders, nanofibers were widely developed as a carbon source to increase their durability and ease of handling. Herein, we report the effect of dispersed activated carbon derived from coconut shell charcoal on the supercapacitor performance of activated carbon nanofibers (ACNFs) by electrospinning. The solution was formed by blending coconut shell charcoal (CSC)-based activated carbon and polyvinyl alcohol (PVA) as a spinning polymer agent. This synthesis was conducted using various concentrations of activated carbon and introducing a surfactant during the process. The electrospinning was held at a 10 kV DC voltage, followed by iodine treatment, thermal stabilization, and carbonization at 800 °C. The highest surface area of 250.46 m2/g was obtained from the ACNFs 25S, consisting of PVA 15 w/v %, CSC 25 wt%, and an anionic surfactant. The electrochemical measurement was conducted using Cyclic voltammetry (CV) and possessed a specific capacitance of 186.50 F/g. Moreover, the ACNFs with dispersed activated carbon are promising to be a high capacitance, low cost, and renewable, thereby representing material toward high-power, environmentally friendly, and renewable energy storage devices through further exploration

NMR spectroscopic and theoretical structural study of 5-exo-methylene-substituted hydantoins

The H-1 and C-13 NMR spectra of a series of 3-phenyl-5-exo-methylene-substituted hydantoins were recorded and assigned unequivocally by the various methods of 1D and 2D NMR spectroscopy. Employing the NMR parameters thus obtained, the NOEs between the different protons within the molecules and the results of accompanying semiempirical (AM1 and PM3, respectively) and ab initio (3-21G*) quantum chemical calculations, the tautomerism, the acidity, the redox potentials, the stereochemistry and the electron density distribution of the hydantoins were studied, In addition, the X-ray crystallographic structure of compound 1r is given and compared with the spectroscopic results