本文建立了多段法渗碳的数学模型，并讨论其物理意义。
In this article, the mathematics model of multi stage carburizing is obtained and its physical meaning is discussed.
多段法渗碳的数学模型是线性偏微分方程。线性偏微分方程的一个重要性质是可迭加性。
The mathematical model of multi stage carburizing is a linear partial differential equation, and superposability is an important property of the linear partial differential equation.
运用线性偏微分方程的可迭加性质所求得的碳浓度分布函数能够描述多段法渗碳过程的物理本质。
The carbon concentration distribution function derived from partial linear differential equation by applying the feasibility of repeat adding can describe the innate character of multi stage ca...
该文建立了多段法渗碳的一维数学模型，用此数学模型能够清晰地描述渗碳过程中每一时段的物理行为。
The mathematic model of one dimensional multi stage carburation is obtained and it can describe every physical phenomenon in carburation.
提出采用合理控制装配、焊接顺序以及多段逆向大幅度跳焊法等工艺，可有效控制油罐底板焊接时产生的波浪变形。
The authors consider that rational welding sequence and multi-plate skip welding method can effectively suppress the wave-type deformation of bottom welding.
方法：采用二阶段抽样法对254名51～75岁居民用多因素分析法进行了调查分析。
Method:254 people aged 51~75 with two stage sampling were investigated by using multifactor analyses.
以二维多段翼型为对象分别讨论了分区重叠结构网格方法、非结构网格方法和自适应的笛卡尔网格法。
The overlapping grid method, unstructured grid method and adaptive Caresian grid method are discussed for a two dimensional multielement airfoil.
最近一个纳入45名帕金森病患者采用基因治疗的研究已经结束并准备将结果公布，该研究是采用随机分组、在第二阶段采用盲法的多中心临床研究。
A 45-patient randomized blinded phase II multicenter clinical trial using the gene therapy to treat Parkinson's has recently ended and results are being readied for publication.
研究开发了多段滴流床反应气提合成双酚A的新设备与工艺，成功地解决了固定床树脂法合成工艺和设备存在的问题。
The equipment and technology of stripping reaction process with multi stage trickle bed reactor have been developed for production of BPA.
结论：应用多频节段生物电阻抗分析法测量人体成分具有较高的可重复性。
CONCLUSION: Multifrequency segmental bioelectrical impedance analysis is reliable in measuring human body component.
采用多车速滑行试验法和功率法对两段法计算结果进行验证，证明了采用两段滑行试验法计算汽车滚动阻力系数和空气阻力系数的正确性。
Then, multi-ample coasting-own data and power calculation method were applied to verifying the results. The results show that the two-stage coast-down test method is correct and feasible.
采用多车速滑行试验法和功率法对两段法计算结果进行验证，证明了采用两段滑行试验法计算汽车滚动阻力系数和空气阻力系数的正确性。
Then, multi-ample coasting-own data and power calculation method were applied to verifying the results. The results show that the two-stage coast-down test method is correct and feasible.
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