Preparation of Iso-VELOCITY and Iso-Depth maps for different shear WAVE velocities in Tehrans alluvium is the main subject of this paper. In this regard, data obtained through geoseismic and geotechnical investigations was used. The collected geotechnical data of about 1000 boreholes including results of 26 new drilled boreholes are considered and combined with the results of 95 refraction surveys and 9 down hole surveys in the studied area. Furthermore the combination of geoseismic surveys, collected geotechnical data and in-situ measurements in drilled boreholes are used to propose a new classification of Tehrans soils based on shear WAVE VELOCITY and N(SPT). A comparison also is made between results of Standard Penetration Test (SPT) in drilled boreholes and shear WAVE velocities obtained from geoseismic surveys. The new correlations established between N (SPT) and shear WAVE VELOCITY for different types of fine-grained soils in south of Tehran are proposed.

In this article the destructive effects of low VELOCITY impact on the residual COMPRESSIVE strength of composite plates with three different size studies. Using a closed from solution and a finite element method the mechanical behavior of the composite plates under impact loading is simulated. Using an experimental program, the results of simulation are evaluated. The composite plates are subjected to impact loading and then they are tested under compression loading conditions. The results of experiments show that the size of the damaged area decreases by increasing the size of the specimen. Therefore, in the real situation that the size of the structure in greater than that of the test specimen, the magnitude of damage is supposed to be smaller. Using Hertz method the magnitude of the impact loading is calculated. The damage area of the impacted specimen is also calculated. By changing the mechanical properties of the material in the damaged area the residual strength of the damaged specimen is simulated. The results obtained from simulation are in good agreement with experimental results

In this labratory study, the effect of joint density (number and spacing) on the pressure WAVE VELOCITY was researched in pyroclastic rocks. After determining the physical properties, the P-WAVE velocities of intact rock samples were measrued. Then, an artificial joint perpendicular to the measuring direction was created in each sample, and the WAVE VELOCITY tests were repeated. These tests were continued up to 5 joints with two sets of 2 and 5 cm spacing. Consequently, the data were analyzed using the statistical methods. The results show that the P-WAVE VELOCITY was decreased by increasing the number of joints in both spacing sets, and thus an inverse linear relationship was obtained. However, as the number of joints increases, the reduction rates of WAVE VELOCITY were different at two spacing sets. More precisely, up to 3 joints, the reduction rate in the 5 cm spacing set was more than that in the other set. Nonetheles, after the third joint, the decreasing rate in the 2 cm spacing set became greater. Generally, the shorter spacing had a more reduction (attenuation) in the P-WAVE VELOCITY. In this regard, at a total of 5 joints, the reduction rate of the P-WAVE VELOCITY in 2 cm spacing set was more than that in the other set.

Background: We aimed to evaluate subepicardial and subendocardial left ventricular (LV) functions in patients with single coronary artery lesion at early stage after percutaneous coronary intervention (PCI).Methods: Patients with left anterior descending (LAD) lesion (n=40) were evaluated. Patients underwent PCI and at least one coronary stent was placed. After PCI, the pulsed-WAVE tissue doppler imaging (pw-TDI) parameters taken from subepicardial and subepicardial layers were compared among the them.Finding: The systolic and diastolic pw-TDI parameters were apparently different between the patient after PCI, while the systolic pw-TDI parameters did not change. The diastolic pw-TDI parameters taken from both subepicardial (circumferential contraction) and subendocardial layers (longitudinal contraction) improved after PCI. After PCI, it was shown that while Ea VELOCITY (P=0.012) taken from the subendocardial layer increased, IVRa VELOCITY (P<0.001) taken from the subepicardial layer decreased.Conclusion: In our study, left ventricular, left atrium, and aortic valve diameter increase in patients with coronary artery disease. The systolic and diastolic functions were impaired at subendocardial and subepicardial layers. These dysfunctions can be easily presented with pw-TDI. Although systolic dysfunction persists, diastolic dysfunction improves at early stage after PCI.

Phase VELOCITY and interaction impedance measurements on slow WAVE structures are especially important in the microWAVE tubes industry. Among the methods available for measuring the phase VELOCITY and interaction impedance, non-resonant perturbation method is simple yet accurate and applicable. In this paper, the correctness of this method for helical slow WAVE structure is investigated with simulation and analytical methods and based on it, a device is built that has the precision needed to move the perturber inside a slow WAVE structure. The results and measurement capabilities of this device have been demonstrated using simulations in CST software and analytical relationships.