Alaboratory experiment was carried out during 2020 in the laboratories of College Agriculture / University Anbar order to study role phosphogypsum values ​​of saturated hydraulic conductivity, capillary height and water holding capacity soil clay soil. The added mixed with at four levels (without adding, 0.3%, 0.6% 0.9%) by weight treatments were incubated for 90 days adding limits field compen...

during the past two decades the use of lignocellouse fibers in reinforcing composites has attracted much research activities. in the present work, date palm fiber was used for production of composites compatible withliving environment. the fibers were pre-treated chemically to remove impurities. in order to verify and compare the effectiveness of the pretreatment methods, lignin, ash, moisture ...

In 1895 the discovery of X-rays by Rontgen led others to wonder if invisible radiations of a similar nature could be produced by other means than a Crookes' tube. In the following year Monsieur Henri Becquerel, in Paris, experimented in this direction, and by good fortune he first tried a salt of uranium. He took a photographic plate and wrapped it in black paper, which completely shielded it f...

Some of the correlations between morphological and other physical properties of planetary nebulae (PNe) are reviewed. In particular, the finding that bipolar (b) PNe have more massive progenitors than the other morphological classes is discussed in detail. Earlier results are confirmed; including all the various sources of uncertainty, the Galactic distribution of objects indicate that b PNe ar...

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