数学模型

According to Fermat's theory and variational calculation, the mathematical model of sound path in dissymmetrical temperature field is established. Furthermore, the sound path equation is solved.

根据Fermat原理和数学变分方法，建立了非均匀温度场中的声传播路径的数学模型，并求出声线方程。

Data analysis shows that the relationship between lengths of body and tentacles of hydra and concentration of hexavalent Chromium ion are statistically significant.

数据分析显示水螅在Cr6+溶液触手和身体的长度相关性在数学统计中是很有意义的，并且归结出浓度与生物指标关系量化数学模型。

In this paper,a two dimension mathematical model of the interferential plane is brought out,and the function of the interferogram is established.

通过建立干涉面光强分布的二维数学模型，确立了干涉图函数的数学表达式，从调制度、相位误差和频率噪声的角度，对动镜倾斜误差进行了系统分析。

In the recent 30 years of the Guhai water-lifting project ,shortage middle arid zone society and the economic development it has made great contribution to since the outly was shortage for a long time,the project facility cannot obtain the immediate service,aging day by day.

固海扬水工程近30a来，为宁夏中部干旱带的社会及经济发展作出了巨大贡献，但是由于长期以来经费短缺，工程设施得不到及时维修，老化日益加剧，为了对宁夏固海扬水工程设施老化状况作出定量的科学评价，通过长期实践并结合数学理论知识，建立了固海扬水渠道工程老化现状评价的数学模型，为固海扬水工程进一步改造和规划提供科学决策的依据。

After that, the author, based on the wasteless mining theories and his research experience, put forward creatively a new method to design and appraise for the wasteless mining, in which the modern applicable visualization technique are applied.

在采矿方案优选方面，发展应用模糊数学与层次分析法的组合决策优化方法对无废开采方案优选的指标体系、权值的分析处理与系统进行了综合评判，并建立了系统实用的方案优化选择数学模型，以获得最佳、合理的无废开采方案。

After that, the process and method of life-cycle design are studied according to the process of green product life-cycle and the priority strategies of life-cycle design are concluded as a whole. In chapter 4, argues that Clean Production Technology conciliates social economy development and environment protection on the basis of relationship analysis among society economy, environment and clean production technology from the perspective of modern Eco-economics. It is proposed that resources cost should be equal to marginal opportunity cost from the point of sustainable development.

第四章从现代环境经济学和可持续发展观点出发，深入地分析了社会经济、环境和清洁化生产技术之间的关系，并从可持续发展角度出发阐释了以边际机会成本作为资源成本的原由及构成；在此基础上，采用数学方法分析了企业清洁化生产的过程，推导了企业清洁化生产资源边际机会成本最小化的约束条件，并研究了企业清洁化生产的技术、经济、环境数学模型。

On the basis of physics nature of cotton, as well as experts experience , this paper applied developed a math model for the computer match-cotton system using fuzzing mathematics, and applied the model in practice successfully.

从棉花的物理性能出发，参照专家经验，用模糊数学理论和方法建立了模拟人工配棉过程的数学模型，并进行了应用尝试。

It made the research aim,the research method and the research object invalidating.

在此前提下，财务学大量地运用数学和逻辑的方法，构建了许多精巧而抽象的数学模型进行分析。

Management ; mathematical method ; ideology ; moiled ; mathematical model.

管理；数学方法；理念；模式；数学模型

From this case, in the assessment, the data of several different time intervals are taken and corresponding confidence levels given, and, employing blind values to express monitoring data and perambulating inspection results, the process method of blind information is applied to the practice of comprehesive assessment. With the observation items in Xiaolangdi Project, the influence factors determing the assessment result are described in the form of blind data. The data are processed according to the blind data algorithms and some scientific and reasonable assessment results are acqired, and the process method overcomes the defect of traditional numerical model, viz., too definitive description of information.

基於此，在综合评判中选取多个不同时间段的数据并赋以相应的可信度，利用盲数表达监测数据和巡视检查结果，将盲信息的数学处理运用到土石坝安全综合评判的工程实例中，并运用盲数运算法则进行盲数处理的探讨，得到了有一定参考价值的评判结果，并克服了传统的数学模型信息描述过於绝对化的问题。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。