نتایج جستجو برای: may also increase karst dissolution therefore
تعداد نتایج: 4289039 فیلتر نتایج به سال:
The purpose of the present study was to investigate the effect of polyethylene glycol (PEG) molecular weights (6000, 12000 and 20000) as solid dispersion (SD) carriers on the dissolution behavior of simvastatin. SDs with various drug : carrier ratios were prepared by solvent method and evaluated for dissolution rate. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), infrared spe...
Background and purpose: The increasing effect of liquisolid systems on dissolution behavior of poor soluble drugs has been proved. In this research, the effect of glycerin, as a nonvolatile solvent, on release profile of indomethacin was evaluated. Materials and methods: The Avicel as carrier and silica as coating powder material in 20: 1 ratio were used. Indomethacin was dispersed in glyc...
The Southwest China Karst, the largest continuous karst zone in the world, has suffered serious rock desertification due to the large population pressure in the area. Recent trend analyses have indicated general greening trends in this region. The region has experienced mild climate change, and yet significant land use changes, such as afforestation and reforestation. In addition, out-migration...
Dissolved CO2 in karst water is the key driving force of karstification. Replenishment concentrations occurs by meteoric that percolates through vadose zone, where produced from microbial activity dissolved. can thus be transported with percolating or gas phase due to ventilation systems. We measured seasonally fluctuating air a cave and their influence on aqueous different depths stagnant colu...
SWAT is a GIS-based basin-scale model widely used for the characterization of hydrology and water quality of large, complex watersheds; however, SWAT has not been fully tested in watersheds with karst geomorphology and downstream reservoir-like embayment. In this study, SWAT was applied to test its ability to predict monthly streamflow dynamics for a 1,555 ha karst watershed, Chapel Branch Cree...
all analytical methods are generally based on the measurement of a parameter or parameters which are somehow related to the concentration of the species.an ideal analytical method is one in which the concentration of a species can be measured to a high degree precision and accuracy and with a high sensitivity. unfortunately finding such a method is very difficult or sometimes even impossible.in...
[1] Simple mathematical models often allow an intuitive grasp of the function of physical systems. We develop a mathematical framework to investigate reactive or dissipative transport processes within karst conduits. Specifically, we note that for processes that occur within a characteristic timescale, advection along the conduit produces a characteristic process length scale. We calculate char...
methodology non-native participants in this study were sixty ba students majoring in english literature and teaching english as a foreign language at khayyam university of mashhad. they were senior students, between 21 to 24 years old, who had studied english for at least three and a half years and had passed several courses including grammar, reading, conversation, and writing. this was assum...
Specially engineered drug particles can solve solubility and formulation problems, which are major challenges for the pharmaceutical industry. Particle size reduction of poorly water soluble drugs results in increased dissolution rate and higher bioavailability or better processability as demonstrated in previous studies [1, 2]. High-pressure homogenization can be used to decrease particle size...
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