Pemurnian Minyak Kelapa Sawit Menggunakan Membran Serat Berongga

Karakterisasi membran serat berongga (hollow fi ber) dari polimer polietersulfon yang telah dimodifi kasi untuk pemurnian minyak kelapa sawit telah dilakukan. Pengaruh morfologi membran dipelajari terhadap kemampuan pemisahan minyak kelapa sawit. Membran modifi kasi adalah membran komersial yang terbuat dari sistem polyethersulfone/Nmethylpirrolidone/polyvinilpyrrolidone,dan polyethersulfone/N-methylpirrolidone/Tetronic 1307. Hasil karakterisasi dengan SEM menunjukkan bahwa membran yang terbuat dari bahan PES/NMP/PVP, dan PES/NMP/Tetronic 1307 mempunyai struktur macrovoid yang lebih banyak dan ukuran yang lebih besar dibandingkan dengan membran yang terbuat dari bahan PES/NMP. Sifat hidrofilisitas membran campuran juga menjadi lebih baik jika dibandingkan dengan membran tunggal PES/NMP. Fluks minyak kelapa sawit terbesar diperoleh 0,27 L/m2.hr.atm pada kondisi tekanan operasi 2,0 kg/cm2 untuk membran hollow fi ber dari bahan PES/NMP/PVP

The Study of Customer Satisfaction in Murah Rezeki Motorcycle Workshop Stabat, Sumatera Utara

The development of the automotive industry has not been matched by the existence of workshops for motorcycles. In some areas, the number of workshops cannot cover the needs their need as to. the customer satisfaction so that in this study is needed to indicate the variable observed such as service quality, price, and location in Murah Rezeki Motorcycle Workshop Stabat, either simultaneously or partially. The type of research used in this research is descriptive research with a quantitative approach. The sampling technique used incidental sampling method with a total sample of 96 respondents. The data analysis method is the multiple linear regression analysis. The result found that the variables of service quality, price, and location partially and simultaneously affect customer satisfaction. The result of the coefficient of determination is 35%. It shows that the variables consisting of service quality, price, and location affect the customer satisfaction variable by 35.0%, while the remaining 65% is explained by other variables not examined in this study

Model of Land Cover Change Caused by Toll Road Access Using Cellular Automata in Sumatra Island

The use of land is a part of the fulfillment of human needs. The establishment of a large-scale infrastructure project often triggers an increase in land cover around its infrastructure project. Most of the increase in built up land tends to occur in areas that are traversed by or located near main accessibility routes such as toll roads. Although the construction of toll roads can improve accessibility between regions, land is a limited resource. So that it becomes the basis for researchers to identify the changes in land use in regencies and cities on the island of Sumatra that are crossed by toll roads that have been operating. The goal of land use change analysis is to give a description or explanation, predict, look at the effects, and make a decision (prescription). This research was conducted by identifying the changes in the existing land cover and predicting the land cover using cellular automata. Cellular automata have proven to be a method that is suitable for predicting the dynamics of land use through spatial simulation. The results show that there was an increase in the amount of land built from early 2017 to 2030. The covered land is developed around the toll gate after it is actively operated. In all provinces studied, deviation discrepancies were found in the conservation and cultivation areas. Deviations that occur in conservation areas need to be considered as there should be no land built in these areas, which means that there are cultivation activities in the conservation areas

Burden and attitude to resistant and refractory migraine: a survey from the European Headache Federation with the endorsement of the European Migraine & Headache Alliance

Background: New treatments are currently offering new opportunities and challenges in clinical management and research in the migraine field. There is the need of homogenous criteria to identify candidates for treatment escalation as well as of reliable criteria to identify refractoriness to treatment. To overcome those issues, the European Headache Federation (EHF) issued a Consensus document to propose criteria to approach difficult-to-treat migraine patients in a standardized way. The Consensus proposed well-defined criteria for resistant migraine (i.e., patients who do not respond to some treatment but who have residual therapeutic opportunities) and refractory migraine (i.e., patients who still have debilitating migraine despite maximal treatment efforts). The aim of this study was to better understand the perceived impact of resistant and refractory migraine and the attitude of physicians involved in migraine care toward those conditions. Methods: We conducted a web-questionnaire-based cross-sectional international study involving physicians with interest in headache care. Results: There were 277 questionnaires available for analysis. A relevant proportion of participants reported that patients with resistant and refractory migraine were frequently seen in their clinical practice (49.5% for resistant and 28.9% for refractory migraine); percentages were higher when considering only those working in specialized headache centers (75% and 46% respectively). However, many physicians reported low or moderate confidence in managing resistant (8.1% and 43.3%, respectively) and refractory (20.7% and 48.4%, respectively) migraine patients; confidence in treating resistant and refractory migraine patients was different according to the level of care and to the number of patients visited per week. Patients with resistant and refractory migraine were infrequently referred to more specialized centers (12% and 19%, respectively); also in this case, figures were different according to the level of care. Conclusions: This report highlights the clinical relevance of difficult-to-treat migraine and the presence of unmet needs in this field. There is the need of more evidence regarding the management of those patients and clear guidance referring to the organization of care and available opportunities