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Development and Characterization of Sisal Fiber Reinforced Polypropylene Composite Materials
348-358Views:429In most of the developing countries, plastic polypropylene is not fully recycled and converted in-to use after it is once used. Sisal fiber is also widely available in different developing countries like Ethiopia. Adding this two materials and developing automotive interior part was taken as a primary motive for it reduces cost and is environmentally friendly. Thus, the main purpose of this research is to develop composite material from natural fibre (sisal fiber) reinforced with recycled plastic waste (polypropylene) for interior automobile accessories specifically for internal door trim panel application. This research examines effect of fiber length, fiber loading and chemical treatment of fiber on the physical and chemical properties of the sisal fiber reinforced polypropylene (SFRPP) composite material. The waste polypropylene and the treated and untreated sisal fiber with variable length and weight ratio (fiber/matrix ratio) were mixed. Flammability of sisal fiber reinforced Polypropylene (SFRPP) composites material was examined by a horizontal burning test according to ASTM D635 and chemical resistance of the sisal fibre reinforced PP composites was studied using ASTM D543 testing method. The result on the flammability test shows that treated fiber has lower burning rate than untreated fiber and decreases with increase in fiber length and fiber loading. The resistance of the composites to water has increased as the fiber length increases and decreased as the fiber loading increase. Generally, SFRPP composite is found to have better resistance to water than NaOH and H2SO4 and treating the fiber has brought considerable improvement on chemical resistance of the composite. Fiber loading and fiber length has positive and negative effect on the flammability of the SFRPP composite respectively.
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Investigation of application and development of precision irrigation technology
239-248Views:250Due to the extreme weather conditions irrigation is nowadays considered an increasingly necessary factor. After evaluating the water requirements of the plant and the available water resources is necessary to decide what irrigation method to use. One of the most commonly used methods in field conditions is rain-type irrigation, of which there are several types (eg linear, winding drum). The uniformity of the field nozzles can be characterized by the Christiansen uniformity factor (CU%) and the distribution uniformity factor (DU%). The coefficients can be derived from the volume of water captured by the rain gauges. Our investigations were carried out in July and August 2019 at the University of Debrecen's Vision Plant Experimental Plant and at a linear irrigation equipment of a Nyírbátor company. The aim of the study was to compare the uniformity of water dispersion applied by conventional linear technology and precision linear irrigation technology. In addition we examined the intercept values of maize.
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Y Generation and the Job Seeking
490-501Views:1363Generations Y and their expectations have caused many surprises for employers. They are different compared to their predecessors. Millennials were born in socialism in our country, but they did not experience from it so much, because they grew up in democracy. Their main feature is that they are openminded to opportunities, and they learn quickly modern technology innovations. They have a strong self-conscious, and are highly proactive. They prefer forms of atypical work, because they can carry out their work anywhere in the world due to the internet access. It is very important for them to keep the work - life balance. These properties have overwritten the conventional management methods, such as conventional recruiting techniques. This paper examines the main job seeking features of the Generation Y based on an empirical research.
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Debrecen légszennyezettségének vizsgálata epifiton zuzmók nehézfémtartalmának tanulmányozásával
48-52Views:137Kutatómunkánk során Debrecen város forgalmasabb csomópontjaiban vizsgáltuk a levegőminőséget nehézfém tartalom szempontjából. Vizsgálatainkhoz epifiton indikátornövényeket gyűjtöttünk Debrecen meghatározott útszakaszai mentén, és városon kívüli kontrollterületen. A mintavétel a zuzmók vegetációs időszakának megfelelően március elején történt. A begyűjtött minták tisztítását, szárítását és roncsolását követően vizsgáltuk azok toxikus fémtartalmát Induktív Csatolású Plazma- Optikai Emissziós Spektrometria elven működő készülékkel. Összesen 9 fém koncentrációját vizsgáltuk, többek között a nickel, ólom, réz és cink tartalmat.
