Effective factors on performance of zeolite based metal catalysts in light hydrocarbon aromatization

Aromatic hydrocarbons are essential compounds, that the presence of which in fuels can improve the octane number. The conversion of the light alkanes to high value aromatics is vital from theoretical and industrial standpoints. Zeolites such as ZSM-5 play an essential role in the aromatization of light alkanes. This paper highlights the mechanism of aromatization of light alkanes such as methane, ethane, propane, butane, and its isomers. Furthermore, effective factors on the aromatization of light alkanes including metal type, crystallinity, acidity, space velocity, pretreatment of zeolites, co-feeding of light hydrocarbon, and operating factors such as temperature have been investigated to determine how a system of zeolite with metals can be useful to reach aromatization with high conversion.

Textile-reinforced mortars; an experimental comparative study of tensile strength improvement methods

In this article, an experimental study is conducted to compare eight improvement methods for the tensile strength of textile-reinforced mortars (TRM). 12 series of samples with different modification methods are compared to determine the most effective factors on crack initiation force and tensile strength of TRM. Eight modification methods are categorized under three main groups of mortar modification, fabric modification, and fabric-mortar interface modification. TRM's first crack force and ultimate force are considered as indices of method performance. One-way ANOVA and factorial analysis were also conducted to statically determine the most significant methods for improving TRM tensile behavior. The results showed that the modification of mortar by short fiber is the most effective method for the enhancement of TRM's first crack force. Also, the methods which led to the transfer of failure mode from mortar to fabrics were the most effective methods on TRM ultimate force improvement. The result showed that coating fabrics with epoxy affects TRM tensile strength more than all other methods. Extra enhancement of TRM ultimate force is achieved by adding silica fume to epoxy before coating the fabrics and spreading the sand and short fibers on impregnated fabrics.

Designing Advanced Biomedical Biodegradable Mg Alloys: A Review

The increased demand for alloys that can serve as implantation devices with outstanding bio-properties has led to the development of numerous biomedical Mg-based alloys. These alloys have been extensively investigated for their performance in living tissue with mixed results. Hence, there are still major concerns regarding the use of magnesium alloys for such applications. Among the issues raised are elevated corrosion rates, hydrogen generation, and the maintenance of mechanical integrity for designated healing times. In addition, toxicity can arise from the addition of alloying elements that are intended to improve the mechanical integrity and corrosion resistance of Mg alloys. The current work reviews the recent advances in the development of Mg alloys for applications as bio-absorbable materials in living organic environments. In particular, it attempts to develop a roadmap of effective factors that can be utilized when designing Mg alloys. Among the factors reviewed are the effects of alloying additions and processing methods on the exhibited mechanical properties and corrosion rates in simulated bio-fluids used in biomedical applications.

A Statistical Analysis for the Accessibility of Electronic Data Delivery System of the Central Bank of the Turkish Republic

The study aims to reveal the most effective factors on the accessibility statistics of the Electronic Data Delivery System (EDDS) of The Central Bank of The Turkish Republic. Besides, another aim is to reveal the effect of the exchange rate on the access statistics of EDDS exchange rate data. For this purpose, a stepwise regression model was used to find the most effective factors on accessibility statistics. According to the results of stepwise regression analysis, it was revealed that 9 out of 26 variables significantly affected the EDDS access statistics. Engle-Granger cointegration test was chosen as the method to examine the relationship between exchange rate and EDDS access statistics. It has been revealed that there is a long-run equilibrium relationship between the EURO/TRY exchange rate and the access statistics of EDDS exchange rate data.

Prevalence of Helminths in Digestive Tract of Cows in Indonesia

Helminthiasis is an important problem that affects the productivity and health of cows in tropical countries. This study aimed to examine the prevalence of helminthiasis in the digestive tract and the factors that affect it. In the current study, feces samples were from 75 cows aged up to one year old. The samples were collected from areas with the majority of the population as cattle breeders. The data were analyzed descriptively and statistically. The result indicated that most of the cows have suffered from helminthiasis caused by Toxocara vitulorum and the prevalence of intestinal helminths was mostly mild. Toxocara vitulorum spp. was the most common nematode worm that infected cows. The most effective factors on prevalence of helminthiasis in cows were age and cage location.

Revisited interpretation of Ta’ārof

Speech acts used in doing ta’ārof (Iranian system of politeness) have been conceptualized in terms of both positive (i.e. sincere or genuine) and negative (i.e. ritual or ostensible) meanings. This study aimed to revisit the interpretation of the negative meaning by concentrating on ta’ārof (ritual) offers produced by characters in Iranian films. First, these items were identified and distinguished from their genuine counterparts based on the strategies used in their structures and analysing their contextual features respectively. Then, the researcher proposed a model in which she adopted the notion of Leech’s (1983) meta-implicature (indirect implicature) to explicate the negative meaning of ta’ārof offers. She grouped a series of effective factors in working out these meta-implicatures. Finally, a tentative hierarchy of stages for identification and interpretation of ta’ārof offers in Iranian films were proposed.