In this paper, the DYNAMIC simulation for a high PRESSURE regulator is performed to obtain the regulator behavior. To analyze the regulator performance, the equation of motion for inner parts, the continuity equation for diverse chambers and the equation for mass flow rate were derived. Because of nonlinearity and coupling, these equations are solved using numerical methods and the results are presented. Additionally, the DYNAMIC analysis results consist of the output PRESSURE change versus time, the displacement of the moving parts versus time, the regulator mass flow rate versus time and the output PRESSURE versus mass flow rate in different controlling spring pre-loads. Furthermore, the sensitivity analysis is carried out and the main parameters affecting the regulator performance are identified. Finally, the results of the DYNAMIC simulation are validated by comparing them with the experimental results.

Using finite element nonlinear analysis, the DYNAMIC soil PRESSURE on perimeter retainingwalls of structures is investigated. Nonlinear Drucker Prager failure criterion is used to model the soilbehavior in the near field. The far field soil and the middle structure are assumed to behave as linearelastic materials. The soil-wall interface behavior is modeled incorporating nonlinear interfaceelements. The internal friction angle of the soil is found to be an important factor in the DYNAMIClateral PRESSURE that has been neglected in the previous investigations. Furthermore, a new diagram isproposed to determine lateral seismic soil thrust on rigid walls.

For a cost-effective design of wave screen, an accurate estimation of DYNAMIC PRESSURE and wave force is needed. This study investigates the DYNAMIC PRESSURE action on elements of wave screen. The wave screen consists of several horizontal pipes with constant distance between them. This wave screen provides convection, interchanges of seawater within the harbor district, and makes available wave energy absorption effectively. The experimental were done on regular waves with 3 heights and 6 periods of waves at a constant water depth of 0. 6 m. Also 3 difference diameters were considered for wave screen pipes. DYNAMIC PRESSUREs distribution along and around the pipes were measured by the PRESSURE transducers. The results indicated that with increasing of the porosity, the PRESSURE difference was decreased and with increasing of the incident wave height, PRESSURE fluctuation for different porosity was increased. Furthermore, the maximum DYNAMIC PRESSURE fluctuation occurred at the angle more than 45° .

Background and Aim: Few studies have assessed the reliability of postural balance measures during DYNAMIC balance performance that introduce additional challenging to postural control system. In addition sometimes in the static conditions some deficiencies of the postural control system may not be revealed obviously therefore the aim of this study was to assess the reliability of postural control parameters during functional performance on force plate in healthy subjects.Materials and Methods: Ten healthy male subjects (mean age: 25.4 years, weight: 68.2 kg height: 176.9cm) participated in this study. None of the subjects were involved in sport activities. Every subject performed three 15seconds trials of eyes open single leg stance on a force plate during DYNAMIC balance task. Participants grasped object with hand at their waist level and release it at above shoulder level. The reproducibility of the center of PRESSURE (COP) deviations (average speed & length of path) was assessed. All participants were tested on 2 sessions with an inter-measurement interval of 7 days. COP data was collected for each trial. The intraclass correlation coefficient (ICC) was used as parameter of intra-session and inter-session (Test-Retest) reliability.Results: The ICCs for intra-session reliability of average speed and length of COP path were 0.89 and 0.91 respectively. The ICCs for inter-session reliability were 0.95 and 0.96 respectively.Conclusion: The study showed high and very high reliability for center of PRESSURE measures during DYNAMIC balance task. Therefore this DYNAMIC performance can be used as a balance pattern in postural control assessment.. These can be used as reliable parameters in DYNAMIC postural control assessment due to high reliability of average speed and length of COP path.

Due to the lack of measurements in many regions, wave characteristics are estimated using different methods. Wave climate hindcasting/forecasting is mostly conducted by numerical models or empirical methods. Until now, different empirical methods have been developed for wave hindcasting. However, with the development of high speed processors, several sophisticated numerical models have been developed for wave prediction. These models are mostly phase-averaged spectral wave models developed in three generations. In the last two decades, third generation wave models have been used widely in academic and practical projects. In this regard, Port and Maritime Organization has produced his own model, PMO DYNAMIC. This model has been developed as a part of first three phases of Monitoring and Modeling of Study of Iranian Coasts project. PMO DYNAMIC package is a software available for engineering purposes. It has several modules that have been developed for different objectives. Wave model is the module which is used for the generation and transformation of wind waves in coastal areas. In this paper, in order to test the PMO DYNAMIC model capabilities, it has been applied for the prediction of wave parameters in Bushehr Bay and the results have been compared with MIKE21 SW model and measured data.

In this article, design and manufacturing of a DYNAMIC PRESSURE sensor based on piezoelectric structure has been put on the agenda. Essential sensor elements are consists of a piezoelectric element that screen printed as sensor element and The five basic components consists of diaphragm, housing, the electrodes and the connector. laser welding, Wire Cut, electrical discharge machining, mold pressing, turning, milling and... are used in Manufacturing processes. The sensitive element, consisting of a circular piezoelectric layer sandwiched in two conductive layers, is screen printed, it has 0.5 mm thickness and 5 mm diameter. The sensitive element has a structure of a plane capacitor with the piezoelectric film as dielectric and the two conductive layers, based on Ag material, as armatures. Device was encapsulated in a stainless steel housing for the DYNAMIC test. The measuring range covers PRESSURE up to 100 MPa while the reaction time is less than 10 ms. This DYNAMIC PRESSURE transducer is ideal for measuring PRESSURE transients or DYNAMIC PRESSURE pulsations in liquids or gases.

Reduction and management of risk of industrial plant especially energy is an important concern. Probabilistic and reliability method are used in risk and cost estimations. Oil, Gas and Petrochemical plant are the most energy producer plants that are in focus of cost, life and operation. These plants consist of several units, parts and equipment’s. In order to study the risk of plants, it is needed to study the equipment’s. The main goal of this research is probabilistic seismic assessment of fixed horizontal vessels. In this paper, finite element model of designed and constructed vessels in a real project is prepared and incremental DYNAMIC analysis (IDA) is performed. Response of vessels components including the vessel body stress, piping stress, flange and elbow deformations, anchor bolt stress are extracted and their related limit state are defined. Finally the fragility curve of vessels components is prepared. The result shows that flange connection is the components that are potential for starting the damage of vessels.

Background: In intertrochanteric fractures، DYNAMIC hip screw (DHS) is the most frequently used tool، but several studies did not give good results for this device in reverse-oblique and transverse fractures. Current study aimed to compare fixation results of reverse-oblique intertrochanteric and short-segment subtrochanteric fractures using DYNAMIC condylar screw (DCS) and DHS in patients referred to Alzahra and Kashani Hospitals in Isfahan, Iran.Methods: In a cross-sectional study، medical files of the patients referred to emergency units of the two hospitals who were diagnosed with intertrochanteric or subtrochanteric fractures and underwent DHS or DCS surgery more than 6 months before were assessed; they were invited for follow-up visit and examination. Written consent forms were taken from all the patients upon their entry; and they were examined in terms of complications including nonunion and failure of device and level of fracture improvement. These cases were evaluated by simple radiography ,too. Results obtained from examination of patients in addition to demographic information were recorded in the data collection form for each patient.Findings: Perfect union was observed in 14 (of 25) patients in DHS group and 21 (of 25) patients in DCS group (56% vs. 84%) six months after the surgery. Bone union was significantly better in DCS group (P=0.031). In addition, six months after the surgery, the devices used in 14 people in DHS group and 24 people in DCS group were fixed and the difference between the two groups was significant (P=0.001). 14 and 24 patients had total recovery in DHS and DCS groups، respectively (20% vs. 44%) with a significant difference (P=0.020).Conclusion: Considering obtained results, it can be concluded that using DCS is recommended over DHS due to severity of pain, bone union and fixation of the device.

In study of flip bucket, it is clear that the impact place of the jet with the downstream floor has the highest possibility of erosion compare to other places. Characteristics of DYNAMIC PRESSURE at impact place will enable us to determine the probability of scouring and its rate. It help also to determine possibility of damages to stilling basin bed and stage of particles separation from the bed which is important for design of plunge pool. In this study, the DYNAMIC PRESSURE as result of impact of the flip bucket jet on the bed for different flow discharge and trajectory height is measured. Analysis of the results showed that the plunge pool downstream of flip bucket jets will be effective when ratio of pool water depth to the thickness of the jet (y/Bj) is greater than 4. Also, studies on the DYNAMIC PRESSURE fluctuations showed that DYNAMIC PRESSURE is not the maximum possible PRESSURE over bar bed (without cushion water). The PRESSURE fluctuation is the largest when a thin layer of cushion water is existing over the impact place. In fact, this thin layer will provide opportunities for development of vortex and turbulent flows.