The possibility of using tree prunings residues from four wood species grown in Saudi Arabia to create cementbonded particleboards (CBPs) was studied. The properties of the produced CBPs at different board densities were evaluated. Panels were made using three different board densities (1100, 1200 and 1300 kg/m) at a constant wood/cement ratio (1/2 by weight). The mechanical properties and dime...

Single-phase perovskite solid solutions are formed across the entire (1 − x)Pb(Mg1/3Ta2/3)O3–xLa(Mg2/3Ta1/3)O3 (PLMT) pseudobinary system. Although as-sintered (1300°C, 3 h) samples with x ≤ 0.1 adopt a phase-separated, “PMN-type” microstructure comprising small (2–3 nm) ordered domains dispersed in a disordered matrix, extensive domain growth and complete order can be induced by extended therm...

İklim dünya ekosistemi için en önemli faktördür ve her zaman değişim halinde olmuştur. İklimde meydana gelen birkaç derecelik bir ısınma veya soğuma hareketi başta insanlar olmak üzere canlıların hayatlarını dönem ciddi şekilde etkilemiştir. Özellikle insanoğlunun gelişimin çetin hava şartlarında azaldığı, doğa döngüsü içerisinde ortaya çıkan daha uygun iklim koşullarında da hızlandığı ise tari...

Long House Valley, located in the Black Mesa area of northeastern Arizona (USA), was inhabited by the Kayenta Anasazi from circa 1800 B.C. to circa A.D. 1300. These people were prehistoric precursors of the modern Pueblo cultures of the Colorado Plateau. A rich paleoenvironmental record, based on alluvial geomorphology, palynology, and dendroclimatology, permits the accurate quantitative recons...

The effect of frequency and sintering temperature on initial permeability of Ni0.55Zn0.45Fe2O4 ferrites have been studied by using an impedance analyzer. The samples were prepared by conventional double sintering ceramic technique using oxide nanoparticles of grain size 30 50 nm. Single phase spinal structure has been confirmed for the prepared samples by X-ray diffraction. As the sintering tem...

Starting from high energetic attrition milled mixtures of either -Al2O3 or amorphous (Al(OH)3) with CaCO3 the binary compound calcium monoaluminate (CaAl2O4) was synthesized with high purity. The processes were carried out on samples with the nominal CaAl2O4 stoichiometry. High energetic attrition milling of the reactants does not eliminate the starting carbonate, both batches showed a high deg...