in this research, the correlation between precipitation change in southern coasts of caspian sea and variability of sea level pressure have been analyzed by using environmental to circulation approach at time period 1339- 1383. in this respect, we make use of daily precipitation data of the 12 synoptic stations of studied area at surface data base section and prepare the time series matrix of p...

the upper level pressure patterns control the climate of the surface. the identification of these patterns in the regional scale is useful for the study of the surface climate elements and their forecasting. in order to understand the pressure centers controlling the climate of iran during the cold period of the year, the daily 500 hpa. geopotential height of the grid points of 2.5 degrees dist...

air pollution is one of the most important problems in urban areas that always threaten citizen's health. photochemical smog is one of the main factors of air pollution in large cities like tehran. usually smog is not only a part of nature, but is being analyzed as an independent matter, which highly affects on the nature. it has been used as relationship between atmospheric elements such as te...

Oceanic surface pressure fields are derived from the NASA Quick Scatterometer (QuikSCAT) surface wind vector measurements using a two-layer similarity planetary boundary layer model in the midlatitudes and a mixed layer planetary boundary layer model in the tropics. These swath-based surface pressure fields are evaluated using the following three methods: 1) a comparison of bulk pressure gradie...

Dynamic arterial blood pressures were recorded by micropuncture of 99 cortical surface arteries and arterioles in cats anesthetized with pentobarbital or chloralose and urediane, using the Wiederhielm servocontrolled micropipette pressure system incorporating pipette tips less than 0.5/A in diameter. During these measurements, systemic blood pressure was varied by supplemental intravenous admin...

Dynamic arterial blood pressures were recorded by micropuncture of 99 cortical surface arteries and arterioles in cats anesthetized with pentobarbital or chloralose and urediane, using the Wiederhielm servocontrolled micropipette pressure system incorporating pipette tips less than 0.5/A in diameter. During these measurements, systemic blood pressure was varied by supplemental intravenous admin...

It is not known whether significant differences in the glenohumeral center of pressure and contact pressure exist between surface replacement arthroplasty and hemiarthroplasty compared with the native joint. Twelve fresh-frozen cadaveric shoulders were dissected free of soft tissue, and the joint capsule was removed. The scapula was potted with the glenoid parallel to the ground. A pressure-sen...