in this paper, polyacrylamide/chromium acetate gel polymer system was prepared as water shut-off system to control water production in one of the iranian oil reservoirs condition. effect of various parameters such as temperature (90 °c) and water formation from view point of salinity and divalent cations, was evaluated on the gelation kinetic and gel strength using bottle testing method. the re...

A number of theoretical and simulation results on star and structure formation in galaxy interactions and mergers is reviewed, and recent hydrodynamic simulations are presented. The role of gravity torques and ISM turbulence in galaxy interactions, in addition to the tidal field, is highlighted. Interactions can drive gas inflows towards the central kpc and trigger a central starburst, the inte...

The advent of 8m-class telescopes has made galaxies at 1 ∼ < z ∼ < 4 relatively easy to detect and study. This is a brief and incomplete review of some of the recent results to emerge from surveys at these red-shifts. After describing different strategies for finding galaxies at z ∼ > 1, and the differences (and similarities) in the resulting galaxy samples, I summarize what is known about the ...

To solve complex spatial problems like visual scanning and spatial navigation, animals must explore and actively sense an array of environmental stimuli. Recent studies have led to an agreement that the hippocampal formation (HF) is essential to the internal representation of spatial relation in animals. In the present study, neural activity was recorded from the HF of three monkeys, which stee...

hemoglobin is a porphyrin containing protein with an a2b2 tetrameric structure and like other porphyrin compounds shows spectral behavior of species specific characteristics. researchers tend to relate bands in the hemoglobin spectra to certain structural and/or functional features. given the fact that hemoglobin is the main oxygen carrier in animals functioning through the oxy«deoxy equilibriu...