查询词典 ecological systems

In this paper,the asymptotic property for two kinds of ecological systems and oscillation for solutions of a neutral differential equations is studied by employing differential inequalities and using eigenvalue analysis,iterative algorithm,induction and comparison theorem etc.Here, the system\'s asymptotic property includes the uniform persistence,the global attractability of the solutions,the asmptotic stability of the solutions and the oscillation of solutions.

本文利用微分不等式、特征根分析法、迭代法、归纳法及比较原理等方法和理论，研究了两类生态模型解的渐近性和一类脉冲中立型微分方程解的振动性，其中包括模型的一致持久生存性，正平衡态的全局吸引性、局部与全局渐近稳定性以及解的振动性。

The asymptoticbehavior of two ecological systems and the unconditionally stability and oscillations in kinds of 4-order delay difference equations are investigated by using analysis method, constructing Lyapunovfunctions, the logarithmic norm, charateristic roots theory and the bifurcation theory. Here, theasymptotic properity includes the uniform persistence, the global attractability of the solutions,the asymptotic stability of the positive solution local or global and the oscillations of solutions.

本文利用定性分析的方法、比较原理、特征值分析法、对数范数、构造Lyapunov函数及分支理论等方法和理论，研究了两类生态模型解的渐近性及一类四阶时滞微分方程解的无条件稳定性，其中包含模型的一致持久生存性、正平衡态的全局吸引性、局部和全局渐近性以及解的振动性等问题。

The development of its theory has gone through two stages, at the first stage, its theory and practice is concentrated on the interactions of family members, and is relationship oriented; at the second stage, its theory and practice are influenced by feminism, multi-culturalism, constructivism, social constructionism and ecological systems theory, and takes on a multi-integrative characteristic.

家庭系统理论的发展经历了两个历史阶段，第一个阶段的理论和实践非常重视家庭成员之间相互作用的过程，具有关系取向的特点；第二个阶段的理论和实践因受到女权主义、多元文化主义、建构主义、社会建构论及生态系统理论的影响，呈现多元综合的特点。

The wetland is one of the three ecological systems in the world and it is the important part of the Globe.

湿地为全球的三大生态系统之一，是地球生态系统的重要组成部分。

Of our people and our ecological systems.

和社会、人类和生态系统的修复上来！

With the development of nonlinear science, chaos has been found in some ecological systems.

随着非线性学科的发展，人们也在生态系统中发现了许多混沌现象。

River basin is an integrated ecological system, and consists of many ecological systems.

流域是一个完整独立的生态系统，这个系统由不同的生态系统组成。

The use of land resources system is a complex and enormous social, economic and ecological systems, traditional qualitative and quantitative methods to effectively address land resource use systems.

土地资源利用系统是一个复杂而巨大的社会、经济和生态系统，传统的定性与定量方法难以有效地解决土地资源利用系统的问题。

The result of benefit evaluations indicator system show that the seven location built by ecological engineering will help to distinguish the integration of local ecological network and irrigated ecological systems. The biomass, IBI index and results of ecological efficiency assessment are best of Yongcyuan waterway and in Taitung and Kolin Yongcyuan waterway in Yiland for irrigation canals and drainage canals respectively. Thus, the results can be an reference point of other locations selecting in future, benefit evaluating, design and construction.

效益评估方法评估结果发现七个实施生态工程建设地点皆有助於区域生态网络及基地生态体系完整度之提升，而圳路类以台东涌水圳、大排类以宜兰柯林涌泉圳的生物量、IBI指数、生态效益评估结果最佳，可作为后续其他工程地点选址、规划设计施工、效益评估之参考点。

On the basis of the metioned above, in the mass, the thesis amalyzes the ecological problems that Wuzhong has and the reasons that result then in , ecological construction acheivments and it"s consumable affecs ;then in detail and using the way combined fix quatity with quality , analyzes the condition, degree, mechanism, processof ecological caustic of various regions and kinds of ecological systems in Wuzzhong, juging the feasibility of restore and reconstruction of them. The paper indicates, as a whole ,the degree of eological caustic of the region is relative severity, but the diffefences between the plain region and the mountains region are very obvious, and all of them can be retored and rconstructed, wich has been proved by theory and practices. According to the conclutions and combining them with the mature theory ecological fumction dividings and the condition of Wuzhong"s mature and society , the study divides the region into seven ecological functional areas. On basis of the ecological construction strategic targets presented by the governments of the country and Ningxia,Wuzhong and the caustic condions of different ecological system in defferent areas, the author design the models of ecological restoration and reconstruction for the different ecological areas and how to use them.

在此基础上，从宏观上分析了吴忠目前存在的主要生态问题和形成原因、生态建设成就与成果自耗因素，接着着重从微观上对吴忠各地的生态致损情况、各类生态系统的受损度、受损机理和过程、生态恢复与重建的可行性进行定量和定性分析判断，指出从整体上看该区域生态受损比较严重，但存在着明显的山川二元结构，其恢复与重建在理论和实践上均证明是可行的，并据此结合已成熟的区域生态功能区区划理论，以吴忠的自然、社会条件和其它有关区划结果等为依据，对吴忠整体进行了生态功能区区划，然后根据国家、宁夏与吴忠三级政府出台的各级别生态建设战略目标、任务，按照有关生态恢复学等有关理论，详细地对七大生态功能区中各受损生态系统的恢复与重建模式进行研究，提出了不同的生物与工程模式及实施办法、途径、措施。

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％。