in last decades, oil spill pollution has become an important issue of concern due to its serious environmental impacts; therefore, necessary actions should be taken to prevent or reduce these types of pollution and their environmental consequences. natural organic sorbents are emerging as proper choices for oil spill cleanup due to their availability, eco-friendliness, and low cost. in this stu...

abstract chemical components of narcissus (narcissus tazetta l.) essential oil investigated under farming and natural habitat conditions in south khorasan province. the essential oil was obtained using solvent extraction method. after purification, the oil was analyzed by capillary gc and gc/ms. 12 compnents making 82/82% of total oil in farm sample and 13 components making 63/86% of total oil ...

background: autoxidation is considered to be the main route of edible oil deterioration, which produces undesirable odors and flavors during storage and heating. the unpleasant flavor of oxidized oil has been attributed to primary and secondary products of unsaturated fatty acids. the microwave heating is a rapid method when compared with other methods of heating. objective: in this research, t...

We investigate the pricing formation of natural gas markets on three different continents (Europe, Asia and North America). We find that natural gas markets showed a strong relationship with the crude oil market between 1992 and 2001 and natural gas prices tended to thermal parity with crude oil prices. From 2002 natural gas markets exhibited a less pronounced relationship with the crude oil ma...

In this article, the U.S. and southern Canadian natural gas supply market is considered. An important model for oil and natural gas supply is the Hubbert curve. Not all regions of the world are producing oil or natural gas following a Hubbert curve, even when price and market conditions are accounted for. One reason is that institutions are affecting supply. We investigate the possible effects ...

The downtrend in oil prices beginning in 2014 represents a challenge for smallopen developing and exporting economies like Libya. This stems from the importance of government revenue generated from the natural resource sector in financing government consumption and investment expenditures as well as capital imports. The dependency on the natural resource sector and a relatively weak non-natural...

Vegetable oils are a class of natural products very frequently used in phytocosmetology. Natural remedies with antiaging action are very popular in our days. Harmfulness of natural compounds on the skin, is quickly observed by the 24-48 hour patch test skin irritation and erythema measurement. Changes in the concentration of melanin and sebum in the dermis, represent real parameters which give ...

Previous economic analyses focused on relationships between crude oil and natural gas markets centered primarily on demand-side considerations. We provide evidence that two important supply-side connections play important roles in understanding crude oil and natural gas market integration. First, crude oil production and natural gas production require a common capital input: rotary drilling rig...