简介:Finite-difference(FD)methodsarewidelyusedinseismicforwardmodelingowingtotheircomputationalefficiencybutarenotreadilyapplicabletoirregulartopographies.Thus,severalFDmethodsbasedonthetransformationtocurvilinearcoordinatesusingbody-fittedgridshavebeenproposed,e.g.,standstaggeredgrid(SSG)withinterpolation,nonstaggeredgrid,rotatedstaggeredgrid(RSG),andfullystaggered.TheFDbasedontheRSGissomewhatsuperiortoothersbecauseitsatisfiesthespatialdistributionofthewaveequationwithoutadditionalmemoryandcomputationalrequirements;furthermore,itissimplertoimplement.WeusetheRSGFDmethodtotransformthefirstorderstress–velocityequationinthecurvilinearcoordinatessystemandintroducethehighprecisionadaptive,unilateralmimeticfinite-difference(UMFD)methodtoprocessthefreeboundaryconditionsofanirregularsurface.Thenumericalresultssuggestthattheprecisionofthesolutionishigherthanthatofthevacuumformalism.Whentheminimumwavelengthislow,UMFDavoidsthesurfacewavedispersion.WecompareFDmethodsbasedonRSG,SEM,andnonstaggeredgridandinferthatallsimulationresultsareconsistentbutthecomputationalefficiencyoftheRSGFDmethodishigherthantherest.
简介:摘要目的探究体外震波碎石患者在使用综合护理后的护理效果。方法研究对象为我院2016.8-2017.8收治的160例体外震波碎石患者,将其采用随机数字表法分成护理1组与护理2组,80例护理1组采用综合护理干预,另80例护理2组采用常规护理。探讨实施不同护理对术后相关指标及护理满意度的影响。结果护理1组术后排石时间、疼痛缓解时间及住院时间均短于护理2组(P<0.05),在护理满意度评分上显著比护理2组高(P<0.05)。结论将综合护理干预应用于体外震波碎石患者后,不仅能提升护理满意度,还能缩短排石时间、疼痛缓解时间及住院时间,此方法值得应用与推广。