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Abstrak :
Latar Belakang: Pandemi Corona Virus Disease 2019 (COVID-19) yang disebabkan oleh Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) berawal dari Wuhan, Cina sejak Desember 2019. Jakarta menjadi salah satu episentrum pandemic COVID-19 di Indonesia. Data penelitian COVID-19 di Indonesia masih sangat terbatas, sehingga diperlukan penelitian untuk mengetahui karakterisik klinis, radiologis, laboratorium dan derajat klinis. Metode Penelitian: Penelitian ini diambil dari 1070 pasien yang dirawat di Rumah Sakit Darurat Wisma Atlet yang menjalani skrining gejala klinis, radiologi toraks, laboratorium dan serologi SARS-CoV-2kemudian dilanjutkan dengan pemeriksaan swab RT-PCR. Hasil skrining swab RT PCR pada 1070 pasien terdapat 836pasien terkonfirmasiCOVID-19, lalu diskrining dari 836 pasien yang memiliki radiologi toraks dan laboratorium lengkap ada 413 pasien. Hasil Penelitian: Pasien terkonfirmasi COVID-19 derajat ringan-sedang didominasi oleh pasien laki-laki(55,4%) dengan kelompok usia < 60 tahun (91,8%) dan rerata umur 39,94±14,17 tahun. Sebagian besar pasien tidak memiliki komorbid, tetapi komorbid paling banyak adalah hipertensi (4,1%). Derajat klinis pasien yang dirawat paling banyak kasus asimtomatik (46%), sedang (31,5%) dan ringan (22,5%). Gejala yang sering muncul adalah batuk (22,5%), demam (14,3%),sesak napas (6,5%), nyeri tenggorok (5,3%) dan pilek (4,8%). Gambaran radiologis sebagian besar pasien normal (41,9%), sesuai pneumonia (31,5%) dan corakan meningkat (26,6%). Hasil pemeriksaan laboratorium didapatkan limfopenia (10,9%), trombositopenia (1,7%) dan peningkatan NLR (18,4%). Serologi SARS-CoV-2sebagian besar pasien reaktif (48,8%). Sebagian besar pasien dirawat ≥20 hari (63,9%), masa konversi ≥14 hari (52,5%) dan luaran akhir pasien sembuh (99,3%). Terdapat hubungan bermakna antara komorbid dengan lama rawat (p= 0,03) dan lama konversi (p= 0,03), status awal masuk RS dengan lama konversi (p= 0,00) dan lama rawat (p= 0,00). Kesimpulan: Proporsi pasien terkonfirmasi COVID-19 dari keseluruhan pasien yang dirawat sebesar 78,13%, sebagian besar laki-laki dan gambaran radiologis normal. Terdapat kenaikan NLR dan kebanyakan serologi SARS-CoV-2reaktif. Sebagian besar pasien yang dirawat kasus asimtomatik dan luaran akhir perawatannya sembuh. ......Background: Coronavirus disease 2019 (COVID-19) is an ongoing pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) originated from Wuhan, China since December 2019. Jakarta is among of the epicenter of COVID-19 pandemic in Indonesia. Research data on COVID-19 in Indonesia is still very limited while there is an urgent need of disease characterization from the perspective of clinical features, radiological finding, laboratory profile, and severity. Methods: This retrospective cohort study involved 1070 patients treated at an emergency hospital in Jakarta, Indonesia. Patients were screened for their clinical symptoms, radiological finding, laboratory profile, including the SARS-CoV-2 immunoserology, and then proceed with the SARS-CoV-2 RT-PCR examination. The screening resulted in 836 patients were confirmed COVID-19, and 413 patients had a complete medical record to be further studied. Results: The mild-moderate cases were dominated by males (55.4%) of age groups <60 years-old (91.8%). The mean age was 39.94±14.17 years-old. Most subjects presented without comorbidities, although hypertension was common (4.1%). Most subjects were asymptomatic (46%) followed by moderate case (31.5%), and mild case (22.5%). Symptoms were cough (22.5%), fever (14.3%), shortness of breath (6.5%), sore throat (5.3%), and runny nose (4.8%). Radiological findings were normal (41.9%), pneumonia (31.5%), and increased opacity (26.6%). Laboratory tests showed lymphopenia (10.9%), thrombocytopenia (1.7%), and increased NLR (18.4%). The SARS-CoV-2 immunoserology was mostly reactive (48.9%). Length of stay (LoS) was ≥20 days (63.9%), conversion period was ≥14 days (52.5%), and most were recovered (99.3%). There were correlations between existing comorbidities and LoS (p=0.03) and conversion time (p=0.03). There were correlations between initial condition during hospital admission with conversion time (p=0.00) and LoS (p=0.00). Conclusion: The proportion of patients with COVID-19 confirmed from all patients treated was 78.13%, whom male, normal radiological finding, increased NLR, reactive SARS-CoV-2 immunoserology, and asymptomatic predominated. Most of the patients were moderate cases and well recovered.

Abstrak :
Penelitian ini membahas tentang Bilangan Reynolds pada dua fasa dari hasil percobaan dengan refrigeran berbeda. Percobaan dilakukan pada kondisi perpindahan panas konveksi didih pada kanal mini horizontal dengan refrigeran R-290 dan R-600a. Test section terbuat dari pipa stainless steel dengan diameter dalam 3 mm, panjang 1000 mm dan dipanaskan secara merata di sepanjang pipa tersebut dengan heat flux divariasikan antara 5 kW/m2 sampai dengan 8 kW/m2. Dari penelitian didapat perubahan temperatur yang terjadi pada dinding dalam test section dengan metoda konduksi dan Nilai Reynolds number dibandingkan dengan kualitas Massa Uap. Fluktuasi Nilai Reynolds number menggambarkan kondisi aliran tiap fasa didalam test section. Dari hasil perbandingan dua Reynolds number untuk masing-masing refrigeran, Isobutana memiliki nilai Reynolds number lebih rendah dibandingkan dengan Propana pada kondisi mass flux dan heat flux yang relatif sama. Nilai Reynolds number ini selanjutnya akan digunakan untuk menentukan Chisolm Number dalam menghitung friction multiplayer. ......This study discusses the Reynolds Number of two phase flow in Horizontal Mini Channel. Experiments were performed on the convective boiling in Horizontal minichannel with R-290 and R600a. The test section was made of stainless steel tube with inner diameter of 3 mm, length of 1000 mm and it is uniformly heated along the tube with heat flux was varied from 5 kW/m2 up to 8 kW/m2. From the experiments, taken data was results the temperature of test section inner diameter and Reynolds Number of liquid phase and gas phase. The Reynolds Number represent flow of the two phases in test section. Comparison of Reynolds Number from the two refrigerant shows that Isobutana have better value than Propana since its Reynolds Numbers is lower than Propana in similar mass flux and heat flux condition. Based on the Reynolds Number, Chisolm Number will concluded to determine two phase friction multiplayer.