Utjecaj metode sinteze na katalitičko reformiranje kerozina

Ni/Y samples were prepared by various synthesis methods to investigate the catalyst performance in the reforming of kerosene. Properties of the samples were characterised using XRD, BET, NH3-TPD, and FTIR techniques. Analysis of the products revealed that more isoalkanes were obtained by the sol-gel method (37.3 %), but the deposition method produced higher aromatic content (32.7 %). Ultimately, the production of 75.81 % jet fuel with a standard range of aromatics (10.70 %) and higher naphthenes (19.3 %) over impregnated catalyst led us to conclude that lower Brønsted acid sites inhibited the occurrence of side reactions and produced more jet fuels. This work is licensed under a Creative Commons Attribution 4.0 International License.Uzorci Ni/Y pripremljeni su različitim metodama sinteze da bi se ispitala učinkovitost katalitičkog reformiranja kerozina. Svojstva uzoraka karakterizirana su tehnikama XRD, BET, NH3-TPD i FTIR. Utvrđeno je da je više izoalkana nastaje sol-gel metodom (37,3 %), dok se metodom deponiranja dobiva veći udio aromata (32,7 %). Proizvodnja 75,81 % mlaznog goriva standardnog udjela aromata (10,70 %) i viših naftena (19,3 %) na impregniranom katalizatoru rezultirala je zaključkom da manji broj Bronstedovih kiselinskih mjesta koči pojavu usporednih reakcija te nastaje više mlaznog goriva. Ovo djelo je dano na korištenje pod licencom Creative Commons Imenovanje 4.0 međunarodna

Optical and electrical characteristics of pyrite films prepared by a new spray method using PVDF as a polymeric binder

Pyrite thin films were deposited on glass substrates by a new and simple spray method using polyvinylidene fluoride as polymeric binder. Prepared pyrite films were characterized by field emission scanning electron microscopy, ultraviolet-visible spectroscopy and Hall auto-measuring instrument. Hall measurements showed p-type conduction of all the prepared thin films. The film prepared by using binder concentration of 2 wt.% showed the best results. Its band gap was estimated 1.55 eV. Also, electrical characteristics of the deposited film were obtained by I-V characteristic curve

Prevalence of nonmedical use of prescription-type opioids, methylphenidate, and sedative-hypnotics among university students in the south of Iran: a regression analysis

Background and aim: Nonmedical use of prescription drugs needs particular attention. The aim of this study was to determine the prevalence of prescription-type opioids, methylphenidate and sedative-hypnotics use, and related factors in university students. Methods: In this cross-sectional study, 524 students of Hormozgan University of Medical Sciences were selected by multi-stage sampling in 2016. A self-report questionnaire had been used examining substance use, religious beliefs and parental support. The questions about substance use were prepared based on the World Health Organization Alcohol, Smoking and Substance Involvement Screening Test (WHO ASSIST). Religious beliefs were measured by Kendler’s general religiosity questionnaire. Parental support was measured by the Persian version of Aneshensel and Sucoff’s scale. All of the analysis was performed using Chi-square test, Fisher exact test, independent-samples t-test and binary logistic regression in SPSS 16 software. The level of significance was 0.05. Results: The last year prevalence of prescription-type opioids, methylphenidate and sedative-hypnotics use was 16.1%, 3.3%, and 10.3%, respectively. The final model of logistic regression indicated hookah use (OR=2.5), methylphenidate use (OR=4.5), sedative-hypnotics use (OR=2.7), and were associated with students’ prescription-type opioids use. The protective factor was familial support (OR=0.97) for prescription-type opioids use. Moreover, sedative-hypnotics use (OR=5.7) and illicit drug use (OR=27.6) were associated with methylphenidate use among students. Conclusions: The results of this study showed that the prevalence of nonmedical use of prescription drugs is considerably high among students and is in need of interventions to reduce the prevalence of these drugs in universities