International Journal of Progressive Sciences and Technologies
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A Comparative Study on Tensile Behavior of Plant and Animal Fiber Reinforced Composites
No full textThe potential applications of natural products which are commonly used in the preparation of natural fiber reinforced composites are explored. The increasing demand for environmentally friendly materials and the need for cheaper fibers which increase the desirable mechanical properties forces to search for the natural products. The products that are abundantly available and are not efficiently used are taken in the study. Rice straw and chicken feather are one among the commonly available natural products of agricultural industry and poultry industry respectively which are considered as waste. These materials are disposed causing negative impact to the environment. Composite samples are prepared using untreated, uneven rice straw and chicken feather fibers using general purpose polyester resin matrix. The tensile behavior of the samples prepared with different volumetric proportions of the matrix and fiber were analyzed. The studies show an increase in the fiber loading decreases the tensile strength till an optimum fiber proportion. The tensile strength of rice straw fiber reinforced composites shows a decreasing trend till 40% of fiber volume and then increases. Similar behavior is observed in chicken feather fiber reinforced composites. The hybrid composites (rice straw and chicken feather combination) show an increasing trend till 30% of fiber volume and then decreases for 40% and again it increases
Exploitation of Resources Management in Iran
No full textThe management of the car the water exposes to some serious crisis and problems such as inadequacy of water, the lack of access to the clean and health water, the quality of controlling the water sources, the disruption in the management of water sources, decreasing the financial source, the lack of Knowledge in the decision makers, and The security of the society being exposes to the danger considering the happened problems and crisis, different methods of managing the water sources such as The management based on the supply of water, the integral management of water sources and effective ways has grown up by passing of time. For the present time, safe guarding the water sources is one of the aims of the regimes of water sources management in agriculture, as one of the biggest consumers of water sources, The management of water sources is performed in two parts of supply and demand and according to the available limitations, special attention is paid to the of consumer's request
Floating Measurements In Relation to a New Laboratory Ionospheric Simulator (Ionospektroskop)
No full textDue to the fact that the ionosphere can affect the passage of radio waves, it plays a very important role as a part of the atmosphere. The ionosphere contains different ionized regions (D region, E region, F1 and F2 region). Each region has its own properties and shows distinct influence on the entering radio signals. The importance of the ionosphere is represented by its utilization for communication systems and its effect on satellite communications and navigation systems. There are different kinds of techniques for studying the ionosphere (Ionosonde, incoherent scatter radar, beacons, in situ measurements, etc.) that provide valuable information about the ionosphere. Because the ionosphere has a dynamic and direct response to solar activities, the patches of ionization in the ionosphere are irregular. As a consequence, ionosphere is greatly variable and quite random in its effects. With the help of a new laboratory ionospheric simulator (a so called Ionospektroskop) close studying and investigation of the characteristics of the ionosphere become possible. Ionosphere-like plasma created by the Ionospektroskop has a similar characteristic (no earth connection and no reference point) as the ionosphere holds. In order to investigate this kind of free-floating plasma, a measuring technique called floating measurement is required. With the help of the configuration of the Ionospektroskop and based on this kind of measuring technique, measuring the electrical properties (such as voltage) of the free-floating plasma gets easier. In this paper, an example of a floating measurement related to the Ionospektroskop is given
Validation of a Method for Determining Heavy Metals in Some Ethiopian Spices By Dry Ashing Using Atomic Absorption Spectroscopy
No full textThe optimal conditions for determination of Pb, Cd and Cr in spices sample by FAAS after dry mineralization 1g spice samples for 5hr in a temperature of 500 °C followed dissolution in 4 mL HNO in Fenugreek, Black cumin, garlic and 3 ginger. Working linear ranges are given: for Cd, 0 -6mg/l, for Cr, 0.2-1mg/l and for Pb, 2-20μg/l. Found detection limits are 0.2mg/l, 0.13mg/l and 0.02μg/l for Cd, Cr and Pb, respectively. The result obtained Lead in Fenugreek, Black cumin, garlic an d ginger ranged from 0.0126 to 0.0155, 0.0205 to 0.0254, 0.0046 to 0.0066 and 0.0161 to 0.0178 mg/kg respectively. Cadmium is detected only in Fenugreek in the ranged of ND to 0.0175mg/kg where as Chromium in Fenugreek, Black cumin, Garlic and Ginger ranges from 0.0187 to 0.0219, 0.0134 to 0.0152, 0.0014 to 0.0016 and 0.0258 to 0.0346 mg/kg respectively which is under the values recommended for concentration levels present in the analyzed samples