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Propulsion and launching analysis of variable-mass rockets by analytical methods

Propulsion and Power Research 2013年第3期2卷 225-233页

作者： D.D.Ganji M.Gorji M.hatami A.Hasanpour N.Khademzadeh Mechanical engineering Faculty Babol University of TechnologyBabolP.O.Box 484Iran Mechanical engineering Department Ferdowsi University of MashhadMashhadIran esfarayen Faculty of Industrial and engineering Department of Mechanical EngineeringEsfarayenNorth KhorasanIran

In this study,applications of some analytical methods on nonlinear equation of the launching of a rocket with variable mass are *** transformation method(DTM),homotopy perturbation method(HPM)and least square method(LSM)were applied and their results are compared with numerical *** excellent agreement with analytical methods and numerical ones is observed in the results and this reveals that analytical methods are effective and *** a parametric study is performed here which includes the effect of exhaust velocity(C_(e)),bum rate(BR)of fuel and diameter of cylindrical rocket(d)on the motion of a sample rocket,and contours for showing the sensitivity of these parameters are *** main results indicate that the rocket velocity and altitude are increased with increasing the C_(e) and BR and decreased with increasing the rocket diameter and drag coefficient.

关键词： Thrust force Drag force Variable massrockets Differential transformation method Homotopy perturbation method Least squaremethod

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Comparison the effect of ephedrine and phenylephrine in treatment of hypotension after spinal anesthesia during cesarean section

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Open Journal of Obstetrics and Gynecology 2012年第3期2卷 192-196页

作者： Atashkhoyi Simin Fardiazar Zahra hatami Marandi Pouya Torab Reza AnesthesiologyAnesthesiology Alzahra Hospital Tabriz University of Medical Sciences Tabriz Iran Obstetrics & Gynecology Alzahra Hospital Tabriz University of Medical Sciences Tabriz Iran Tabriz University of Medical Sciences Alzahra Hospital Tabriz University of Medical Sciences Tabriz Iran

Background and Objective: The effectiveness of ephedrine and/or phenylephrine, in treatment of hypotension secondary to spinal anesthesia for cesarean section and their effects on fetal/neonatal outcome were studied. Methods and Materials: Sixty healthy parturients were randomly assigned to two groups;group e (n = 33) received boluses 5 mg/ml increments ephedrine and group P (n = 27) received a boluses of phnylephrine 100 μg/ml increments for treatment of hypotension after spinal block during cesarean section. Changes in maternal blood pressure and heart rate, and incidence of nausea-vomiting, neonatal Apgar score at 1 and 5 minutes of delivery, and umbilical arterial blood gas values were recorded. Results: There were no differences in treatment of hypotension following sympathectomy after spinal block with two drugs. Neonatal outcome was similar in two groups. There were not significant differences in umbilical arterial values in two groups. Conclusion: ephedrine and phenylephrine are both effective vasopressores for treatment of hypotension associated to spinal block during cesarean section without adverse effects on infants/neonates.

关键词： Cesarean Section Spinal Anesthesia Hypotension ephedrine Phenylephrine Fetal/Neonatal Outcome

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