We consider a neutral particle with magnetic moment antiparallel to the field . with the interaction potential energy between the magnetic moment of the particle and the magnetic field , we obtain the classical motion equation of the neutral particles in the loffe trap . in some limit conditions , by using the perturbative method , the equations may take on concise forms . of which the two equations about x and y are mathieu equations . if we properly set the parameters and have the condition a > > q > 0 , we can solve the mathieu equation with the traditional wkbj method . as a new attemptation , with fourier series expansion we solve the mathieu equation and obtain the classical motion law of the neutral particles 若阱的参数设置使得条件> > q 0成立时,我们可以利用传统的wkbj方法近似求解马丢方程。作为一种新的尝试,本文还采用傅立叶级数展开的办法来对马丢方程进行求解,从而得到中性粒子在阱中的经典运动规律。在研究ioffe阱对中性粒子的囚禁问题时,实际上我们更感兴趣的是马丢方程的周期解,而要想获得这种周期解,和q必须满足一定的关系,亦即必须选择阱的特定的参数和粒子的特定初始条件,对这一问题我们进行了尝试性的研究。
Through the analysis of the growing mechanism of high - tech enterprises , this paper also discusses the behavior limited condition of the system agent , offering a kind of economic behavior principles for analyzing agent behaviors and exposing the system features of high - tech industry ecosystem and controlling principles 通过对高技术企业成长机制的分析,讨论了系统要素的行为约束条件,给出了分析要素行为的一种经济行为规则,分析了高技术产业生态系统的系统特征和控制原则。
Secondly , this dissertation introduces the operation principles of kmv and creditmetrics models , and emphatically probes into how the models to measure credit risk of assets portfolio , and analyses the applications in credit asset pricing , the investment decision based on var and the supervision by using internal credit risk measurement models , and advances creditmetrics model based on conditions of china ' s commercial banks , and studies fundamental conditions , limited conditions , and how to use moutun ' s pricing model testing results of creditmetrics model 接着对kmv模型和creditmetrics模型的运作原理进行了介绍,并重点探讨了模型是如何对信用资产组合的信用风险进行度量,以及对信用资产定价、基于受险价值的投资决策以及利用内部信用风险度量模型进行监管等方面作了分析,提出基于我国商业银行信用风险实际的creditmetrics模型,分析了该模型运用的基本条件和限制条件以及如何使用默顿定价模型对creditmetrics模型分析结果进行检验。
In the design of applying the numerical simulation method to return roadway bolt support on working face in some mine , the author builds a numerical model that based on real condition , rules of designing numerical model and geological mechanics parameter of the regional terrain as the simulated limiting condition by geological data research in spot 摘要将数值模拟方法应用到某矿工作面回风顺槽煤巷锚杆支护设计中,根据实际条件和建立数值模型的原则,通过现场地质资料调查得到区域岩层地质力学参数作为模拟边界条件,建立了数值模拟模型。
This paper focuses on a discussion of following issues through a combined of theoretical analysis and numerical calculation , and of theory - oriented , engineering analogy , experience and quantitative test . the stability analysis of slopes of deep foundation pit ; checking caculation of tensile breaking limiting condition of soil - nailing , grouting nail sheath anchored limit condition , rising of bottom of foundation pit and piping . measures are proposed for applying this method to slit stratification in disadvantage geologic 本文介绍了土钉支护技术的发展及作用机理,并结合工程实例,采用以理论为基础,重点研究探讨了土钉支护在深基坑边坡稳定分析、土钉抗拉断裂极限状态验算、整体稳定性验算、注浆钉包裹体锚固极限状态验算、基坑底隆起验算、抗管涌验算等方面设计计算方法,并提出了在其它不利地质环境中采用土钉支护应采取相应的措施。
Abstract : based on analysis of status and structure of land resources in tengxian , it is pointed out that its limited conditions are such as less and bad land and problemes are such as unreasonable texture and no care on land use , and the suggestions and countermeasures correspondly by the idea of sustainable development such as land improving and land use control and population control have been given 文摘:在分析藤县土地资源现状的基础上,指出了不利于土地持续利用和开发的地少质差、土地利用结构不合理及重用轻养等主要问题,并根据可持续发展的思想提出了改良土壤、用途管制、控制人口等对策。
Basing the stress status of the arch , the necessary limit conditions for the existence of the soil arch have been gained and these conditions can be used to decide the maximum pile spacing . these conditions not only ensure the slope ' s endurance to develop but also ensure the safety of the control engineering 同时根据土拱的应力状态,得出土拱体存在的必要条件,由此给出最大桩间距的确定条件,这些条件既保证了桩间岩土体抗滑能力的充分发挥,又能保证抗滑桩整治工程设计的安全。
So the methods of design and computing about limit condition of bearing capacity is still adopted in present criterion . under the precondition of meeting the demand of construction ' s using function , the main content that is researched in this article is how to make the scheme of mixed soil - cement piles composite ground on the safe side economical and reasonable , according to the rule of the design for deformation control the article , which is based on formers " theory and practice , combining with the example of engineering , utilizing the tool of matlab . 5 . 0 , using optimizing by plural modality method , makes a primary discussion on the design parameter of the scheme for mixed soil - cement piles composite ground , according to the rule of the design for settlement controlment method 在现行规范中仍然采用的是承载力极限状态设计计算方法。在满足建筑物使用功能要求的前提下,如何按照变形控制设计的原则,使得水泥土搅拌桩复合地基方案更加安全可靠、经济合理,是本文研究的主要内容。本文在总结前人的理论和实践成果的基础上,结合工程实例,利用matlab . 5 . 0工具,采用复形调优法,按沉降控制设计原则,对水泥土搅拌桩复合地基方案设计参数的优化进行了初步的探讨,得出了一些有益的结论,对工程实践具有一定的指导意义。
Adopting archimedes number arq as similarity standard , the author determine every kind of similarity scale according to geometry scale 1 / 18 and other limit condition , at the same time , complete organization of model essence , simulation heat source system , design and arrangement of air supply and exhaust system according to every kind of similarity scale 采用热量阿基米德数arq作为相似准则,按照1 / 18的几何比例尺以及其他制约条件确定各种相似比例尺。根据各种相似比例尺完成模型本体结构、模拟热源系统及模型送排风系统的设计和配置。