This work studied the physiochemical properties of Ajali River polluted with Industrial effluent at different sampling points from -250m upstream before pollution to 2250m downstream. Statistical package for Social Science (SPSS) was used statistical analysis. Post ANOVA test determine if there is any significant difference between means and which distance occurred. A measuring wheel Global Pos...

The study of the isotopic composition of structural carbonate in fossil vertebrate hydroxylapatite has been hampered by uncertainty concerning sample treatment and arguments about the susceptibility of this material to diagenetic alteration. Our investigation of sample treatment reveals that some methods commonly used to remove organic matter and secondary minerals induce significant isotopic o...

A biological assessment of the Tang Sorkh River (Iran) was studied from July 2013 to August 2014 using benthic macroinvertebrate communities. Samples were gathered every two months, from five stations using a Surber sampler( 30×30cm), fixed in formalin (4%) and then separated and identified in the laboratory. Environmental conditions (current velocity, temperature, depth, width, dissolve oxygen...

When used at high temperature in air, titanium-based alloys form an oxide scale their surface but also dissolve large amount of oxygen metallic matrix and this is a cause embrittlement. Nitrogen secondary oxidant, which dissolves embrittles the alloy. Oxidation experiments Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy, for 1000 h 650 °C synthetic air (N2-20%O2) mixture Ar-20%O2, showed that nitrogen decreases...

many constants and coefficient effect on the modeling results. in many cases, it is possible these constants and coefficients differ from their real values in the environment, but the modeling results adapted with real boundary conditions due to other factors adjustment during modeling. uncertainty analysis is a tool for assessing the effect of uncertainty of various factors on the modeling res...

prediction of spatial and temporal variation of water quality is vital for managing pollutantsdisposal into the rivers. depletion of dissolved oxygen (do) takes place due to the consumption of oxygen bymicrobes to digest bio-degradable pollutants which enter a water course. reaeration takes place in a specificrate depending on do deficit. many investigators have formulated models as an alternat...