background: the increase in the prevalence of cesarean section (c-section) in recent decades has become a public health problem worldwide. studies of cesarean section in order to identify the causes and form policies and interventions to reduce the incidence of this health problem are necessary. this study was conducted with the aim to investigate the causes of c-sections performed at niknafs a...

In this paper, we present the analysis results on vibration serviceability of a pedestrian bridge considering effect moving mass inertia. Using dynamic finite element analysis, considered different walking scenarios, including density, speed, random walking, and synchronized to analyze acceleration response 40m long single-span with steel composite box cross section. We showed that equivalent f...

As part of the Low-Energy Demonstration Accelerator (LEDA) portion of the Advanced Accelerator Applications (AAA) project we have fabricated and will perform high-power RF tests on Section 2 of the 700MHz Coupled-Cavity Drift-Tube Linac (CCDTL). This CCDTL section contains six, two-gap accelerating cells. This portion of the CCDTL was designed to accelerate the 100-mA, LEDA RFQ proton beam to 7...

spectral decomposition of time series has a significant role in seismic data processing and interpretation. since the earth acts as a low-pass filter, it changes frequency content of passing seismic waves. conventional representing methods of signals in time domain and frequency domain cannot show time and frequency information simultaneously. time-frequency transforms upgraded spectral decompo...

Electric power systems usually involve sinusoidally varying (or nearly so) voltages and currents. That is, voltage and current are functions of time that are nearly pure sine waves at fixed frequency. In North America, most ships at sea and eastern Japan that frequency is 60 Hz. In most of the rest of the world it is 50 Hz. Normal power system operation is at this fixed frequency, which is why ...

In this work various construction character/frequency information sharing structure approaches are proposed in order to optimize transposition_invariant distance evaluation, [SD87], that distance is used to construct a Burkhard-keller tree, [BK73] and [NK82], where is organized a dictionary of strings token over a characters alphabet [SP88], to achieve searchings of strings best matching one on...

Considered are the issues of using electric energy storage system in traction power supply direct current a single-track section. An overview main directions domestic and foreign research field these systems to increase capacity efficiency is given. Modeling operation based on calculation load graphs within boundaries inter-substation zones, formed depending conditions for passage trains railwa...

This paper reviews a cyclic scheduling model of repetitive manufacturing environments consisting of exible machines and multi-stage jobs. We explicitly model two system performance measures, throughput and ow time, while incorporating variability arising from uncertainty in operation processing times. We present an iterative approximation scheme to estimate the two moment behavior of our perfor...

Othogonal Frequency Division Multiplex (OFDM) has gained considerable attention in recent years. It has been adopted for various standards include the 802.11a wireless LAN standard. In this project, we implemented an OFDM receiver based 802.11a standard. Furthermore, since spatial diversity is the ultimate way to increase system capacity in bandwidth-cautious wireless applications, the SVD ante...

Abstract A new method of broad banding a helix TWT is suggested in which, instead shaping the dispersion characteristics helical structure by using tapered geometry dielectric helix-support rods, two-stage loading provided severing two sections each with conventional supports here typically wedge cross section. One was heavily loaded compared to other section so that gain peaks on frequency sca...