词义发展的方式

在关于词义发展的问题上，前人已做过大量的工作。传统的研究都是从单个词意义的引申着手，认为词义的发展变化都是由个别词孤立的引申而来。在这个问题上，许嘉璐、孙雍长和蒋绍愚三位先生给出了不同的看法。本文就是对这三位先生的观点的一个比较分析。     

饱和潜水技术在深水海底管线膨胀弯安装中的应用

海洋石油的开发逐渐向更深水域发展,饱和潜水技术由于作业水深较深,持续作业时间长的特点正在被广泛采用,并将得到更大的发展。饱和潜水技术是人类对于潜水技术的又一个突破。在海管膨胀弯安装中,由于需要进行复杂的水下操作,饱和潜水技术被普遍用于海管膨胀弯的安装中。本文通过以平湖二期八角亭工程项目海管膨胀弯安装的实例,对饱和潜水技术进行简单介绍,并对膨胀弯安装中饱和潜水技术的应用进行重点叙述,对未来其他深水使用饱和潜水技术进行海管膨胀弯安装可以有借鉴作用。     

Influence of water saturation on propagation of elastic waves in transversely isotropic nearly saturated soil

Biot's two-phase theory for fluid-saturated porous media was applied in a study carried out to investigate the influence of water saturation on propagation of elastic wave in transversely isotropic nearly saturated soil. The characteristic equations for wave propagation were derived and solved analytically. The results showed that there are four waves: the first and second quasi-longitudinal waves (QP1 and QP2), the quasi-transverse wave (QSV) and the anti-plane transverse wave (SH). Numerical results are given to illustrate the influence of saturation on the velocity, dispersion and attenuation of the four body waves. Some typical numerical results are discussed and plotted. The results can be meaningful for soil dynamics and earthquake engineering.     

本溪市耐用消费品拥有量的预测模型

利用Logistic模型,研究了本溪市耐用消费品的社会拥有量(以彩电为例)的发展趋势,并对未来几年内本溪地区的耐用消费品的需求量作出了预测.     

两种稳定性矩阵类及亚正定阵类的扩张

本文给出了两种稳定性矩阵的若干等价命题。得到了这两种稳定性矩阵类是亚正定阵类的某种相似扩张类。讨论了这三种矩阵类的各自扩张是否是饱和的问题。     

关于变压器推挽功放电路最大不失真输出功率又一计算式

引用临界饱和电阻推导出一新的囊大不失真情出功率表达式,并陈述了它与原有表达式的应用场合     

液体饱和蒸气压测定装置的改进与实验

在多年实验的基础上，改进了液体饱和蒸气压测定装置中的核心部件－－平衡管，在实验中得到了较好效果。     

Performance analysis of IEEE 802.11e EDCA in wireless LANs

INTRODUCTION IEEE 802.11e is designed to support multimedia applications. The main and mandatory scheme of IEEE 802.11e standard is enhanced distributed channel access (EDCA), which adopts service dif-ferentiation in configuration. The performance analysis of EDCA has been extensively studied by analytical or numerical means in recent years (Kong et al., 2004; Xiao, 2005; Zhu and Chlamtac, 2005; Hui and Devetsikiotis, 2005; Zhang et al., 2006). With the help of these works, perf…     

Saturation throughput analysis of RTS/CTS scheme in an error-prone WLAN channel

In this paper, a new three-dimensional Markov model is proposed for the estimation of saturation throughput of RTS/CTS （request to send/clear to send） scheme in an error-prone wireless local area network （WLAN） channel. The model takes account of the effect of bit error on all the frames, and station short and long retry limits. Saturation throughput was re-analyzed using the new Markov model and numerical results closely matched those from simulation, confirming the accuracy of the new model. Evaluation of the influence of different parameters on throughput showed that the saturation throughput is sensitive to channel bit error rates and packet length, especially in high bit error conditions.     

阻塞流测定与动态调整算法

提出了基于深度优先搜索的阻塞流测定与动态调整的算法,精确测定有向流网络中的一个可行流是否为阻塞流,若一个可行流是阻塞流,可以通过动态调整,在流量不变的情况下使之变为一个非阻塞的可行流。本算法为解决网络阻塞和平衡网络负荷提供最佳方案,具有极强的实用性。