查询词典 hilbert problems

A particular class of problems, known as Grand Challenge problems, are problems whose full solution requires semi-infinite computing resources.

某一特定类别的问题，被称为大挑战问题，这些问题的全面解决方案需要半无限的计算资源。

Do not get married will have a range of issues, such as children's growth problems, account problems, school problems.

不结婚会带来一系列问题，如宝宝的成长问题，户口问题，上学问题等。

The tracer migration that the tracer concentration continuously injecting into semi-infinite sand column(initialization velocity is zero) and the pollutant continuously enter into aquifer through a discharging well that completely enter into the dive aquifer are two representative groundwater pollution problems ,Then this paper respectively sets above two decided solution problems and the union simulation problem of groundwater and solute as examples, from the question description, the mathematical model selection and determination, the parameters selecting to carry on the value computation, the read-write of attribute data , visualizes by the IDL programs, carries on the numerical simulation and the visualization post-processing to the above groundwater pollution problems, and according to the numerical solution and the solute migration curves, briefly analyzes and predicts the temporal and spatial distribution features and distribution range of contaminant concentration.

然后分别以半无限长沙柱中连续注入示踪剂浓度的运移、污染物通过一完全进入潜水层的排放井连续进入含水层这两个典型地下水污染定解问题及地下水流和水质联合模拟问题为例，从问题描述、数学模型选取确定、参数选取到运用IDL编程进行数值计算、属性数据读写、可视化，对上述地下水污染问题进行数值模拟和可视化的后处理，并根据数值模拟的数值结果和溶质运移曲线，对污染物浓度的分布范围及随时空变化趋势作了简要分析预测。

Consequently, it leads to a lot of problems which could cause the imperfect procedure of new products introduction, delay of marketing and quality problems for new products which finally results in the customers' dissatisfactions, degradation of enterprises brands and decline of competitiveness. Some research data show that Chinese company may have some problems in their new product introduction process: the product can't meet customers requirement in the market; don't design or introduce new product to meet customers' requirement; many times rework in the introduction process, and redesign the new product after introduction; without timely introduction plan, the new product introduction cycle is slow compare to the transnational Corporations and new technology.

研究资料表明，中国企业在进行产品导入的过程中经常会出现以下问题：上市的产品有诸多质量毛病，不能满足客户的需求；新产品开发和导入过程中，仍然奉行技术导向的思路，自己能做什么就做什么，而不是千方百计满足顾客的需要；产品导入过程经常出现返工，不断地从生产甚至是从市场返回到设计部门重新设计，导致大量的重复劳动；产品导入速度相对市场中的跨国企业以及行业的技术更新，显得非常缓慢，新产品开发和导入项目在开展时缺乏精确的进度计划，因此缺乏进度控制等等。

Global warming, destroying of ozonosphere, desertization, acid rain and other environmental problems are not any problems of one country because these problems have threatened fundament for survival of all lives on the earth.

在我们身边发生的地球温暖化及臭氧层破坏、沙漠化、酸雨等地球环境问题不再是某一个国家的问题，如今已经成为威胁到地球上所有生物赖以生存的根本的问题。

Partitioning problems belong to a kind of NP- complete optimization problems, which occur frequently in the real world. This paper intr oduces a solution to partitioning problems with satisfactory results by using extende d Hopfield neural network.

摘 要 划分问题是一类常见的NP完备的优化问题，本文利用推广的Hopfield神经网络模型解决了划分问题，并取得了较好的效果，为这个问题的解决提供了一条新的途径。

The flow resistance of Ice slurry increases if the pipes obliquity increases. That means the ice slurry that in the level pipe has the largest flow resistance, the reason is: the gravitation make the flow became more and more foul-up, accordingly, lead to the increase of flow resistance. Sixthly, introduced all of the preparative tasks before we began the experiment, because we met many problems during the test, we had our own methods which could solve these problems. In this paper, problems and these methods were introduced.

随着管道倾角的增大，二元冰的摩擦阻力减小，也就是说相同条件下水平管道内的摩阻最大，这是因为重力的影响导致管道内二元冰和乙二醇分层现象更加明显，从而导致紊流程度增大，最终使得摩阻增大；第六，对二元冰蓄冷空调系统运行前的准备工作进行了介绍，由于在试验过程我们遇到了很多问题，针对这些问题，我们有自己的方法和解决办法，本文介绍了这些问题和相应的解决办法。

After defining notations and ways of positioning on these surfaces, the book considers the problems of the construction of convex hulls , Voronoi diagrams , and triangulations , proximity problems , and visibility problems .

在定义了一系列表达式及曲面上的配置方式后，探讨了凸壳，Voronoi图，三角剖分，相近问题和可见性问题。

We also consider two obnoxious center problems and some problems related to problems A, B,C and D.

我们还研究了问题A，B，C，D的一些推广及两个&讨厌型&的中心选址问题。

This article discusses the theoretical questions such as 'the transnational ethnic groups' connotation, classification, the differences between transnational ethnic groups and problems of these groups, then analyses the conditions and causes that give rise to problems of transnational ethnic groups, the evolution trend of transnational ethnic groups' influence upon geographic politics and the enlightening significance for us in the course to resolving problems of transnational eth...

本文对跨界民族的内涵、分类、跨界民族和跨界民族问题的区别等理论问题进行了探讨，在此基础上，分析了造成跨界民族问题的条件和原因、跨界民族对地缘政治的影响会沿着什么样的趋势进行演变及跨界民族问题在解决过程中所带给我们的启示

I hope that this success is just the first in a long series.

我希望这只是成功的开始。

Three dimensional stresses on the interface of tire and soil, tire deflection and soil sinkage are measured.

测试轮胎——沙土界面上的三向应力、轮胎变形和沙土沉陷；建立考虑剪切应力对沙土承载特性产生影响的车轮牵引性能预测模型；分析车轮作用下土壤的纵向稳定性。