The hypereutectic aluminium-silicon alloys AlSi25Cu4Cr and AlSi25Cu5Cr are heat treated T5, T6 T7. quenching of the was carried out under same conditions. Artificial aging at T5 a temperature 180º C for 2, 4 6h, 8, 10, 12 14h. artificial studied compositions T7 370º 20, 40 60 min. influence treatment on size, shape distribution primary eutectic silicon crystals in alloy structure investigated. ...

Phthalimide was reacted with chlorosulfonic acid to give sulfonic acid-functionalized phthalimide (SFP), which characterized by 1H NMR, 13C NMR, FT-IR, XRD (X-ray diffraction), SEM (scanning electron microscopy), EDX (energy-dispersive X-ray), mass, TG (thermogravimetry) and DTG (derivative thermal gravimetry) spectra. Afterward, its catalytic activity was examined for the condensation of aryla...

A series of new quinazolione derivatives containing a conjugate sytem 13 a-l were synthesized via three step-procedure. The first step is the condensation 5-hydroxyanthranilic acid (10) at 160oC for 2 h to afford intermediate 11 in high yield. This was then reacted with n-butylamin acetic 14 give 12 92%. Finally, reaction different aldehydes 140oC 14h furnished conjugates 13a-l 62-81%. bioassay...

poly(4-vinylpyridine)-supported copper iodide nanoparticles is reported as a new, green and recyclable catalyst for the synthesis of aryl-14h-dibenzo [a-o] xanthenes under solvent-free conditions. this catalyst can be recovered by simple filtration and recycled up to 8 consecutive runs without any loss of their efficiency.

This review article deals with the documentation of all previous work on propagation Gattan. It was found that induced spawning Gattan is similar to common carp and Bunnei. The sensitive brooders needs a great care during handling transportation. weight 5 were 1.5-10 kg for females 1-2.5 males, age 4-9 3-6 males respectively. artificial breeding season continue from10 March till mid June. MS222...

We present a preliminary analysis of the spatial and seasonal lightning distribution near the Cerro Chascón science preserve, probed with a space-borne imaging sensor and groundbased storm detectors. The lightning flash rate in this area is among the lowest in the world for comparable latitudes. Thunderstorms only occur around 5 days per year. Most observed lightning strikes occurred far to the...

The title compound, [Cu(4)(C(7)H(6)N(2)O(3))(4)(H(2)O)(4)]·14H(2)O, a tetra-nuclear [2 × 2] grid-type complex with S4 symmetry, contains four Cu(II) atoms which are bridged by four pyrazole-carboxyl-ate ligand anions and are additionally bonded to a water molecule. Each Cu(II) atom is coordinated by two O atoms of the carboxyl-ate and acetyl groups, two pyrazole N atoms of doubly deprotonated 3...