List of Articles relative density

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  1 - Evaluation of the physical and chemical properties of the essential oil obtained from the oleo-gum- resin of two populations of Ferula gummosa from Fars and Isfahan provinces
  Arife Vaez Shahrestani Razieh Azimi Atergeleh Vahid Abdousi Mehdi Mirza marzieh ghanbari jahromi
  Ferula gummosa (Barijeh) belongs to the Apiaceae family and is one of the most important pasture, medicinal and industrial plants, whose oleo-gum-resin (galbanum) has a commercial aspect. The essential oil and oleoresin of F. gummosa are widely used in the food, pharmac More

  Ferula gummosa (Barijeh) belongs to the Apiaceae family and is one of the most important pasture, medicinal and industrial plants, whose oleo-gum-resin (galbanum) has a commercial aspect. The essential oil and oleoresin of F. gummosa are widely used in the food, pharmaceutical and cosmetic industries. The aim of the present study is to investigate and compare the physicochemical properties of the essential oil obtained from the oleo-gum-resin of two F. gummosa populations from Isfahan and Fars habitats. For this purpose, the oleo-gum-resin of F. gummosa was collected from two areas in Kashan and Fars. The essential oil was then extracted from the fresh oleo-gum-resin by water and steam distillation. The essential oil was analyzed quantitatively and qualitatively using GC and GC/MS devices. The appearance, physical and chemical characteristics of the essential oil of two populations of F. gummosa, including relative density, refractive index, optical rotation, and phytochemicals of the essential oil were investigated and compared. Based on the results, the essential oil of F. gummosa is a transparent and colorless liquid with a turpentine odour and a distinct green note. The essential oil of two populations of Kashan and Fars has relative density of 0.874 and 0.869, refractive index of 1.4810 and 1.4795, and optical rotation of 11.35° and 23.52°, respectively. The results of comparing the average physicochemical characteristics of the essential oil obtained from the oleo-gum-resin of the two F. gummosa populations from Fars and Kashan indicate that there is no significant difference in the traits of relative density and refractive index, and on the other hand, there is a significant difference in the amount of optical rotation of the two essential oil samples. Based on the essential oil analysis, hydrocarbon monoterpenes including β-pinene (71% and 68.8%), δ-3-carne (9.4% and 5.2%), myrcene (3.9% and 2.4%), α-pinene (3.6% and 3.4%) and limonene (2.4% and 15.6%) were identified as the main compounds of essential oil in two F. gummosa populations from Kashan and Fars, respectively. Manuscript profile
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  2 - Investigating some effects of using Metakaolin as pozolan in concrete
  Gholamreza saghir shams abadi Abdolkarim Abbasi dezfoli
  Development of concrete technology is undergoing for achieving high strength concrete. Metakaolin (MK) for obtaining high strength and durable concrete recently is used in industry. The relatively high micro particles and pozolan activity and reaction with calcium hydro More

  Development of concrete technology is undergoing for achieving high strength concrete. Metakaolin (MK) for obtaining high strength and durable concrete recently is used in industry. The relatively high micro particles and pozolan activity and reaction with calcium hydroxide of cement, causes lower voids, permeability and increasing durability. In the present research the history of pozolans and their materials specially MK and their effects on mechanical properties to achieve an optimize percentage of MK instead of cement were investigated. The tests are included as workability, absorbing water, relative density, electric resistance (that shows permeability and corrosion resistance) and compressive strength. The tests were carried out on 0%, 10%, 15% and 20% of MK in replacement of cement on 150x150 mm samples on 7 and 28 days after casting. The results show that 10% of MK has better workability. 15%  of MK higher compressive strength and 20% higher electric resistance and lower absorbing water and 15% have a reduced relative density Manuscript profile
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  3 - The effect of sowing date on weeds population and identification dominant species in chickpea farm
  Ehsan fathi Iraj Tahmasebi Nasrin Teimoori
  10.22034/aej.2016.523928
  ABSTRACT    An experiment was carried out as a factorial based on completely randomized design in three replication to determinate damages caused by weeds in three different planting dates and identification of dominant weed species in chickpea farms in K More

  ABSTRACT    An experiment was carried out as a factorial based on completely randomized design in three replication to determinate damages caused by weeds in three different planting dates and identification of dominant weed species in chickpea farms in Kurdistan University Research Farm located in Dehgolan during the cropping year of 2012-13. The three experiment factors were conducted as follows: the first factor, sowing date in three levels of autumn, waiting and spring, the second factor in two levels of weed interference and non-interference and the third factor was chickpea cultivars including ILC482, Azad, Arman, Pirouz and Kaka. Abundance of weed species in autumn sowing was higher than waiting and spring planting. Galium tricornotum, Turgenia latifolia and Geranium tubrosum were dominant species in pea farm. Galium tricornotum and Turgenia latifolia were the most abundant species in autumn sowing. Turgenia latifolia and convolvulus arvensis were the most abundant species in witing and spring planting, respectively. The highest relative density in autumn sowing date was obtained from Turgenia latifolia. Turgenia latifolia had almost 50% of relative importance of all weed species in autumn sowing. Turgenia latifolia, Galium Tricornotum and convolvulus arvensis make it difficult to harvest chickpea because of their morphological characteristics and growth traits. The highest density of weed species was recorded in autumn sowing date. Due to high density of weed species in different plantings, if they were not controlled, remarkable reduction in chickpea yield would be predictable, especially in spring sowing which is faced with moisture deficiency during growth. Manuscript profile