نتایج جستجو برای: pulse
تعداد نتایج: 90141 فیلتر نتایج به سال:
In this paper, the propagation of a Gaussian and femtosecond laser pulse through a plasma channel is considered and the amount of induced chirp, as well as it’s type, on laser pulse frequency has been investigated. The group velocity dispersion (GVD) and relativistic effects has been taken into account in propagation equations. It is concluded that the relativistic effect induces positive chirp...
One of the interesting Laser-Plasma phenomena, when the laser power is high and ultra intense, is the generation of large amplitude plasma waves (Wakefield) and electron acceleration. An intense electromagnetic laser pulse can create plasma oscillations through the action of the nonlinear pondermotive force. electrons trapped in the wake can be accelerated to high energies, more than 1 TW. Of t...
in present study we determine the zinc and lead levels in human blood samples by differential pulse polarography under optimum experimental conditions (ph=7.5, scan rate=5mv/s and pulse amplitude=50mv) the polarographic reduction peaks of zn and pb were examinedin the -0.72 v and-0.15 respectively. the zinc and lead content can be determined by in comparison with their standard solutions. accor...
in this paper data were collected from 120 farmers in north khorassan province for the two periods (2005-2007) in order to survey the role of rain-fed lentil risk profile for designing an insurance model. to evaluate looses of each risk, risk frequency, risk impact criteria’s as well as risk matrix were used. results showed that low risk was the largest risk area. during study period, a decreas...
Background: Pulse Oximeter monitoring has become so common over previous decades that in some health care units, blood oxygen level is now considered as the fifth vital sign. However, it seems there is still some lack of knowledge and/or experience among medical staff operating pulse oximeter and interpreting its results. The aim of this study was to investigate and compare the knowledge on Pul...
introduction blood pressure (bp) is one of the important vital signs that need to be monitored for personal healthcare. arterial blood pressure is estimated from pulse transit time (ptt). this study uses two pulse sensors to get ptt. the aim of this study was to construct an optical system and to monitor blood pressure continuously and without cuff in people with different ages. materials and m...
medical environments such as hospital waiting rooms can affect a client’s anxiety level as wellas psychological and physiological responses to his or her situation. the aim of this research was to evaluatethe use of environmental design, specifically the design which incorporates elements of nature, in clinics andhospitals to decrease anxiety, blood pressure and pulse rates of waiting clients. ...
in this work, the influence of different edm parameters (pulse current, pulse voltage, pulse on-time , pulse off-time) in finishing stage on the surface roughness (r a ) as a result of application copper electrode to a workpiece( cold work steel din1.2379) has been investigated. design of the experiment was chosen as full factorial. statistical analysis has been done and artificial neural n...
Backgraound: It is recommended to use BIS (BISpectral) to determine anesthesia levels. Currently, due to low capacity in Iran, anesthesiologists use cardiac indices, such as pulse rates and blood pressure to detect anesthesia levels. This study was designed to assess association of cardiac parameters with anesthesia levels measured by brain function. Methods: In this descriptive study, 14 pati...
This paper presents a study of the relationship between Electrical Discharge Machining (EDM) parameters on the EDM efficiency factors using a full factorial design, based on pulse on-time, duty cycle and tool polarity parameters in EDM machining of AISI H13 tool steel. The results show that, in positive polarity, the plasma flushing efficiency and pulse efficiency increase according to the puls...
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