| 1. | There is few country hasing so many attractive field tour resource more than american
世界上很少国家能像美国这样有如此多样诱人的野外旅游资源。 |
| 2. | Therefore , the study of thermoacoustics is one of the most attractive fields in refrigeration engineering
因而热声机械成为制冷界的一个研究热点。 |
| 3. | The preparation and property research of cbn film have been one of difficult and attractive field in the scientific world
Cbn薄膜的制备和性质研究一直是国际上的研究热点和难点之一。 |
| 4. | The preparation and property research of c - bn thin film have been one of difficult and attractive field in the scientific world
C - bn薄膜的制备和性质研究一直是国际上的研究热点和难点之一。 |
| 5. | Low density parity check ( ldpc ) codes are good error - correcting codes , which can approach shannon ' s capacity limit . due to the sparsity of its check matrix , ldpc codes can be decoded only with linear time complexity using iterative decoding algorithm . therefore , ldpc codes have become one of the most attractive fields in the channel coding community
低密度校验码是一种逼近香农限的好码，由于其校验矩阵的稀疏特性，采用迭代译码算法，它的译码仅具有线性时间复杂度，所以目前ldpc码己成为信道编码理论界的研究热点之一。 |
| 6. | Due to the advantages of ldpc codes , their applications in reliable communications have received great interests and have become one of most attractive field in channel coding community . now , the application of ldpc has been put on the agenda . this thesis investigates some aspects of ldpc codes with emphasis on message passing algorithms and quantization decoding schemes of ldpc codes
由于低密度校验码具有诸多优点，它在信息可靠传输中的良好应用前景已经引起学术界和it业界的高度重视，成为当今信道编码领域最受瞩目的研究热点之一，低密度校验码的应用也已经被提到日程上。 |
| 7. | As a result of the heightening of mechanical operation speed and the application of new materials and new structures , the nonlinear dynamic behavior in rotating machines is becoming increasingly outstanding and important . nonlinear dynamic phenomena in rotating machines cant be described , explained and predicted by rotordynamics based on linear system theory . along with the deepening and permeating of nonlinear scientific research , the nonlinear vibration of rotor systems has become an attractive field in recent years . from a point of view to set up the distinct corresponding relations between vibration states and failures of rotating machines , main advances in the research of rotor nonlinear vibration are summarized , and typical nonlinear dynamic phenomena and their forming mechanism are also summed up in the paper . the aim of the paper is to enrich the diagnostic knowledge base of rotating machines . 55refs
由于机械运转速度的不断提高和新型材料、新型结构的推广应用，旋转机械的非线性动力学行为日显突出和重要.基于线性系统原理的转子动力学理论与方法难以对实践中出现的丰富的非线性动力学现象作出准确的描述、阐释和预测.近年来，随着非线性科学研究的深入和渗透，转子系统非线性振动已成为应用力学和机械工程领域的研究热点之一.从有利于建立旋转机械振动状态集与故障集之间的映射关系出发，综述了近年来转子系统非线性振动研究的主要进展，总结了转子系统中出现的典型非线性动力现象及其产生机理，目的在于丰富旋转机械故障诊断知识库.参55 |
| 8. | Quantum spin systerm in low dimensions has been one of the most attractive field in condensed matter physics for many decades . not only because of many meaningful properties of such systerms , but also in the field the existence of simplified models , which serve as paradigms for understanding and studying the role of strong interactions in many - electron systems
近年来，低维量子自旋系统一直是凝聚态物理学中最活跃的研究领域之一，不仅因为它自身的一些特殊性质，而且因为其中存在着许多简化模型，能够作为理解研究强关联多电子系统的范例。 |
