PENGARUH INFLASI, PERTUMBUHAN PENDUDUK DAN PERTUMBUHAN EKONOMI TERHADAP TINGKAT PENGANGGURAN TERBUKA DI KOTA SEMARANG TAHUN 2011-2020

The open unemployment rate is someone who wants to work, is trying to get a job but has not managed to get it. The problem of unemployment is a problem that is very difficult to avoid because on average it is experienced in one area, including in the city of Semarang, Central Java. The purpose of this study is to analyze the effect of inflation, population growth and economic growth on the open unemployment rate in Semarang City in 2011-2020. The type of data used is secondary data in the form of time series data for 2011-2020 which is sourced from the Central Statistics Agency of Semarang City. This research method uses the Multiple Linear Regression method. The hypothesis that has a significant effect on the open unemployment rate is inflation. Meanwhile, the coefficient of determination or R-square value of 0.652 means that the variables of inflation, economic growth and population growth are able to explain 65.2% while the remaining 34.8% is explained by other variables.Keywords: Open Unemployment Rate, Multiple Linear Regression, R-Square Value The open unemployment rate is someone who wants to work, is trying to get a job but has not managed to get it. The problem of unemployment is a problem that is very difficult to avoid because on average it is experienced in one area, including in the city of Semarang, Central Java. The purpose of this study is to analyze the effect of inflation, population growth and economic growth on the open unemployment rate in Semarang City in 2011-2020. The type of data used is secondary data in the form of time series data for 2011-2020 which is sourced from the Central Statistics Agency of Semarang City. This research method uses the Multiple Linear Regression method. The hypothesis that has a significant effect on the open unemployment rate is inflation. Meanwhile, the coefficient of determination or R-square value of 0.652 means that the variables of inflation, economic growth and population growth are able to explain 65.2% while the remaining 34.8% is explained by other variables.Keywords: Open Unemployment Rate, Multiple Linear Regression, R-Square Value

Effect of salinity on hydroxyapatite nanoparticles flooding in enhanced oil Recovery : A mechanistic study

Fluid-fluid interactions can affect any enhanced oil recovery (EOR) method, including nanofluid (NF) brine-water flooding. Flooding with NFs changes wettability and lowers oil-water interfacial tension (IFT). Preparation and modification affect the nanoparticle (NP) performance. Hydroxyapatite (HAP) NPs in EOR are yet to be properly verified. HAP was synthesized in this study using co-precipitation and in situ surface functionalization with sodium dodecyl sulfate in order to investigate its impact on EOR processes at high temperatures and different salinities. The following techniques were employed, in that sequence, to verify its synthesis: transmission electron microscopy, zeta potential, thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray diffraction, particle size analysis, and energy-dispersive X-ray spectra. The outcomes showed the production of HAP, with the particles being evenly dispersed and stable in aqueous solution. The particles' surface charge increased from -5 to -27 mV when the pH was changed from 1 to 13. The HAP NFs at 0.1 wt % altered the wettability of sandstone core plugs from oil-wet at 111.7 to water-wet at 9.0 contact angles at salinity ranges of 5000 ppm to 30,000 ppm. Additionally, the IFT was reduced to 3 mN/m HAP with an incremental oil recovery of 17.9% of the initial oil in place. The HAP NF thus demonstrated excellent effectiveness in EOR through IFT reduction, wettability change, and oil displacement in both low and high salinity conditions

Enhancing ASP flooding by using special combinations of surfactants and starch nanoparticles

This study aimed to address the challenges faced by mature oilfields in extracting substantial oil quantities. It focused on improving the efficiency of alkaline–surfactant–polymer (ASP) flooding technique, which is a proven tertiary recovery technology, to overcome scaling issues and other hindrances in its large-scale implementation. Appropriate materials and their suitable concentrations were selected to enhance the ASP flooding technique. Special surfactants from Indonesia were introduced to improve the interfacial tension reduction and wettability alteration. Reservoir rock model that resembling Langgak oilfield in Sumatra was utilized, and low-salinity water was employed to mimic the oilfield conditions. Starches derived from cassava nanoparticles (CSNPs) and purple yam nanoparticles (PYNPs) were combined separately with conventional hydrolyzed polyacrylamide (HPAM) polymer to enhance its performance. Sodium hydroxide and sodium carbonate were used as alkaline in final ASP formula. It was demonstrated from this research that only two combinations of ASP formulations have led to improved oil recovery. One combination utilizing PYNPs resulted in 39.17% progressive recovery, while the other combination incorporating CSNPs achieved 35% incremental oil recovery. The ASP combination that resulted in recovery rate of 39.17% was composed of sodium hydroxide (NaOH) at a concentration of 1.28 wt.%, PSC EOR 2.2 (0.98 wt.%), and a combined polymer consisting of HPAM (0.2 wt.%) and PYNPs nano-starch (0.6 wt.%). The second combination led to 35% recovery rate and involved NaOH also at concentration 1.28 wt.%, PSC HOMF (0.63 wt.%), and a combined polymer comprising from HPAM (0.2 wt.%) and CSNPs nano-starch (0.8 wt.%). These findings of this study highlighted the potential of this modified ASP flooding to enhance oil recovery in mature oilfields, thereby offering valuable insights for oil industry

Self medication with antibiotics in Yogyakarta City Indonesia: a cross sectional population-based survey

Extent: 8p.Background: Self medication with antibiotics has become an important factor driving antibiotic resistance. This study investigated the period prevalence, patterns of use, and socio-demographic factors associated with self medication with antibiotics in Yogyakarta City Indonesia. This cross-sectional population-based survey used a pre-tested questionnaire which was self-administered to randomly selected respondents (over 18 years old) in Yogyakarta City Indonesia in 2010 (N = 625). Descriptive statistics, chi-square and logistic regression were applied. Results: A total of 559 questionnaires were analyzed (response rate = 90%). The period prevalence of self medication with antibiotics during the month prior to the study was 7.3%. Amoxicillin was the most popular (77%) antibiotic for self medication besides ampicilline, fradiomisin-gramisidin, tetracycline, and ciprofloxacin to treat the following symptoms: the common-cold including cough and sore throat, headache, and other minor symptoms; with the length of use was mostly less than five days. Doctors or pharmacists were the most common source of information about antibiotics for self medication (52%). Antibiotics were usually purchased without prescription in pharmacies (64%) and the cost of the purchases was commonly less than US $1 (30%). Previous experience was reported to be the main reason for using non-prescribed antibiotics (54%). There were no socio-demographic variables significantly associated with the actual practice of using non-prescribed antibiotics. However, gender, health insurance, and marital status were significantly associated with the intent to self medicate with antibiotics (P < 0.05). Being male (Odds Ratio = 1.7 (1.2 - 2.6)) and having no health insurance (Odds Ratio = 1.5 (1.0 -2.3)) is associated with the intent to self medicate with antibiotics. Conclusions: This study is the first population-based study of self-medication with antibiotics among the Indonesian population. Usage of non-prescribed antibiotics as well as intent of doing so is common across socio-demographic categories. Given the findings, factors influencing people's intentions to self medicate with antibiotics are required to be investigated to better understand such behavior. Impact of health insurance coverage on self medication with antibiotics should also be further investigated.Aris Widayati, Sri Suryawati, Charlotte de Crespigny and Janet E Hille

Identification of novel conserved peptide uORF homology groups in Arabidopsis and rice reveals ancient eukaryotic origin of select groups and preferential association with transcription factor-encoding genes

Abstract Background Upstream open reading frames (uORFs) can mediate translational control over the largest, or major ORF (mORF) in response to starvation, polyamine concentrations, and sucrose concentrations. One plant uORF with conserved peptide sequences has been shown to exert this control in an amino acid sequence-dependent manner but generally it is not clear what kinds of genes are regulated, or how extensively this mechanism is invoked in a given genome. Results By comparing full-length cDNA sequences from Arabidopsis and rice we identified 26 distinct homology groups of conserved peptide uORFs, only three of which have been reported previously. Pairwise Ka/Ks analysis showed that purifying selection had acted on nearly all conserved peptide uORFs and their associated mORFs. Functions of predicted mORF proteins could be inferred for 16 homology groups and many of these proteins appear to have a regulatory function, including 6 transcription factors, 5 signal transduction factors, 3 developmental signal molecules, a homolog of translation initiation factor eIF5, and a RING finger protein. Transcription factors are clearly overrepresented in this data set when compared to the frequency calculated for the entire genome (p = 1.2 × 10-7). Duplicate gene pairs arising from a whole genome duplication (ohnologs) with a conserved uORF are much more likely to have been retained in Arabidopsis (Arabidopsis thaliana) than are ohnologs of other genes (39% vs 14% of ancestral genes, p = 5 × 10-3). Two uORF groups were found in animals, indicating an ancient origin of these putative regulatory elements. Conclusion Conservation of uORF amino acid sequence, association with homologous mORFs over long evolutionary time periods, preferential retention after whole genome duplications, and preferential association with mORFs coding for transcription factors suggest that the conserved peptide uORFs identified in this study are strong candidates for translational controllers of regulatory genes.</p

Pengembangan Sistem Informasi Profil dan Layanan Desa Popoh Berbasis Website

Program desa digital merupakan program pemerintah yang bertujuan untuk meningkatkan pembangunan sarana dan prasarana teknologi informasi desa yang ada di Indonesia. Desa Popoh merupakan salah satu desa yang berada di Kecamatan Selopuro, Kabupaten Blitar, Provinsi Jawa Timur, Indonesia yang siap untuk menjalankan program desa digital tersebut. Berawal dari ditemukannya kendala dalam melakukan publikasi kegiatan desa, dan kurang meratanya penyebaran informasi serta layanan desa, Pemerintah Desa Popoh muncul dengan solusi untuk melakukan digitalisasi informasi dan layanan desa dalam bentuk website. Harapannya solusi tersebut akan mempermudah masyarakat nantinya untuk mengakses informasi dan layanan desa, serta mempermudah Pemerintah Desa Popoh dalam melakukan publikasi kegiatan desa. Pengembangan website dilakukan dengan menggunakan WordPress sebagai CMS dan didukung dengan plugin, tema, dan perangkat lunak lain seperti Jotform. Untuk lebih mempermudah akses masyarakat menggunakan ponsel pintar, maka website akan dibangun menggunakan prinsip mobile-first dan model SDLC prototyping. Sistem ini memiliki 8 fitur, yang diuji menggunakan 2 metode pengujian yaitu Black-box Testing dan Usability Testing. Dimana dari pengujian yang dilakukan kepada 5 responden tersebut didapatkan hasil rata-rata tingkat kesuksesan 97,5%. Selain itu, untuk memperkuat akurasi tingkat usabilitas dilakukan juga survei menggunakan system usability scale dan dari perhitungan didapatkan skor 79,5 dari 100. Sehingga berdasarkan interpretasi nilai dari system usability scale skor tersebut dapat termasuk dalam kategori “Baik”. Sehingga dari hasil ketiga pengujian tersebut dapat disimpulkan sistem informasi profil dan layanan Desa Popoh ini sudah sesuai dengan kebutuhan dan layak untuk digunakan secara umum

Eksperimen Penerapan Hick Law dan Match Between the System and the Real World pada Aplikasi Rembang Gemilang Mobile untuk Meningkatkan Usability

Smart city merupakan penggunaan teknologi dan komunikasi untuk meningkatkan pelayanan masyarakat dan mencapai kualitas hidup yang lebih baik. Pada Kabupaten Rembang Sendiri telah meluncurkan smart city-nya yang bernama Rembang Gemilang Mobile pada tahun 2022. Pada observasi yang telah dilakukan pada Rembang Gemilang Mobile yang menemukan bahwa Rembang Gemilang belum menerapkan kaidah Hick Law yang ditunjukkan pada halaman yang terletak register dan Rembang Gemilang Mobile juga belum menerapkan prinsip match between the system and the real world yaitu pada bagian icon untuk fitur wisata yang menggunakan icon kamera sebagai representasi dari fitur tersebut. Penelitian ini menggunakan pengujian A/B testing kepada 60 partisipan secara unmoderated dan Single Ease Question setelah pengujian selesai serta penentuan hipotesis akan dilaksanakan perbandingan dengan T-test dan ChiSquare Test untuk design control dan design treatment. Hasil analisis menunjukkan pada task register tidak ada perbedaan pada success rate(p=1.00), task time(p=0.15), dan ease(p=0.25) untuk halaman register pada Aplikasi Rembang Gemilang Mobile ketika menggunakan desain asli dan desain dari hukum hick. Kemudian hasil analisis menunjukkan pada task icon wisata tidak ada perbedaan pada success rate(p=1.00), task time(p=0.47), dan number of error(p=0.33) untuk icon pada fitur wisata aplikasi Rembang Gemilang Mobile ketika menggunakan desain icon kamera dan desain icon pantai

Enhancing Oil Recovery by Polymeric Flooding with Purple Yam and Cassava Nanoparticles

Significant amounts of oil remain in the reservoir after primary and secondary operations, and to recover the remaining oil, enhanced oil recovery (EOR) can be applied as one of the feasible options remaining nowadays. In this study, new nano-polymeric materials have been prepared from purple yam and cassava starches. The yield of purple yam nanoparticles (PYNPs) was 85%, and that of cassava nanoparticles (CSNPs) was 90.53%. Synthesized materials were characterized through particle size distribution (PSA), Zeta potential distribution, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). The performance of PYNPs in recovering oil was better than CSNPs, as found from the recovery experiments. Zeta potential distribution results confirmed the stability of PYNPs over CSNPs (−36.3 mV for PYNPs and −10.7 mV for CSNPs). The optimum concentration for these nanoparticles has been found from interfacial tension measurements and rheological properties, and it was 0.60 wt.% for PYNPs and 0.80 wt.% for CSNPs. A more incremental recovery (33.46%) was achieved for the polymer that contained PYNPs in comparison to the other nano-polymer (31.3%). This paves the way for a new technology for polymer flooding that may replace the conventional method, which depends on partially hydrolyzed polyacrylamide (HPAM)