广西高校图书馆联盟建设构想

开展合作并结成区域性联盟是这个时代国际图书馆界的发展趋势。文章论述了广西高校图书馆面临的机遇与挑战,提出了广西高校图书馆联盟建设的宗旨、目标、任务、组织管理等具体构想。     

浅谈多媒体教学在环保工程概论课程中的应用

通过研究多媒体在教学应用中的优点以及存在的问题,结合环保工程概论课,提出在教学中应该如何应用多媒体,从而有效利用多媒体在教学环境中提供的多元化学习资源,达到优化教学效果的目的。     

浅议校企合作背景下的高职创业教育

创业教育是一项实践性很强的教育,仅靠几节理论课远远不够,还需提供各种实践机会与之配合。为此,高职院校应充分发挥与企业联系紧密的优势,与企业合作建立创业教育实践基地,并努力探索创业教育校企合作的原则与方式,以及校企合作背景下的创业教育应采取的相关策略。     

A simple channel estimator for space-time coded OFDM systems in rapid fading channels

A simple channel estimator for space-time coded orthogonal frequency division multiplexing (OFDM) systems in rapid fading channels is proposed. The channels at the training bauds are estimated using the EM (expectation-maximization) algorithm, while the channels at the data bauds are estimated based on the method for modelling the time-varying channel as the linear combination of several time-invariant "Doppler channels". Computer simulations showed that this estimator outperforms the decision-directed tracking in rapid fading channels and that the performance of this method can be improved by iteration.     

网络嵌入、技术能力与大学衍生企业绩效

大学衍生企业的可持续成长是学术界和企业界关注的热点问题。基于社会网络理论与企业资源观,本文构建了技术能力、网络嵌入与衍生企业绩效的概念模型,并运用结构方程模型对湖南省等134家衍生企业进行了实证检验。结果发现,网络的关系性嵌入、结构性嵌入和认知性嵌入都有利于改进衍生企业绩效,但其作用程度依次降低;技术能力与衍生企业绩效正相关,并在结构性、关系性网络嵌入与绩效之间起着中介作用,而没有中介认知性网络嵌入对衍生企业绩效的促进作用。     

Extended-state-observer-based output feedback adaptive control of hydraulic system with continuous friction compensation

This paper presents an extended state observer-based output feedback adaptive controller with a continuous LuGre friction compensation for a hydraulic servo control system. A continuous approximation of the LuGre friction model is employed, which preserves the main physical characteristics of the original model without increasing the complexity of the system stability analysis. By this way, continuous friction compensation is used to eliminate the majority of nonlinear dynamics in hydraulic servo system. Besides, with the development of a new parameter adaption law, the problems of parametric uncertainties are overcome so that more accurate friction compensation is realized. For another, the developed adaption law is driven by tracking errors and observation errors simultaneously. Thus, the burden of extended state observer to solve the remaining uncertainties is alleviated greatly and high gain feedback is avoided, which means better tracking performance and robustness are achieved. The designed controller handles not only matched uncertainties but also unmatched dynamics with requiring little system information, more importantly, it is based on output feedback method, in other words, the synthesized controller only relies on input signal and position output signal of the system, which greatly reduces the effects caused by signal pollution, measurement noise and other unexpected dynamics. Lyapunov-based analysis has proved this strategy presents a prescribed tracking transient performance and final tracking accuracy while obtaining asymptotic tracking performance in the presence of parametric uncertainties only. Finally, comparative experiments are conducted on a hydraulic servo platform to verify the high tracking performance of the proposed control strategy.     

The Deep-Time Digital Earth program: data-driven discovery in geosciences

Current barriers hindering data-driven discoveries in deep-time Earth (DE) include: substantial volumes of DE data are not digitized; many DE databases do not adhere to FAIR (findable, accessible, interoperable and reusable) principles; we lack a systematic knowledge graph for DE; existing DE databases are geographically heterogeneous; a significant fraction of DE data is not in open-access formats; tailored tools are needed. These challenges motivate the Deep-Time Digital Earth (DDE) program initiated by the International Union of Geological Sciences and developed in cooperation with national geological surveys, professional associations, academic institutions and scientists around the world. DDE’s mission is to build on previous research to develop a systematic DE knowledge graph, a FAIR data infrastructure that links existing databases and makes dark data visible, and tailored tools for DE data, which are universally accessible. DDE aims to harmonize DE data, share global geoscience knowledge and facilitate data-driven discovery in the understanding of Earth''s evolution.     

关于我国换股合并会计处理方法的探讨

尽管权益结合法存在许多缺陷，但由于购买法目前在我国尚不具备现实运用环境，且为了促进我国企业合并的发展，现阶段应允许我国进行换股合并的食业采采权豁结合法。     

职业教育在人的发展中的功能研究

长期以来,在"教育与人"和"教育与社会"两大命题中,更受关注的是后者而非前者,在人的"个性发展"和"全面发展"、"个性化"与"社会化"之间,更受重视的也是后者而非前者.在对"职业教育在人的发展中的功能"相关研究成果及重要词语进行辨析的基础上,对职业教育在人的发展中具备适应和促进人的发展职业化、个性化以及持续化的功能方面有必要作深层次的研究.     

绿化斑块合并的景观格局光谱绿化廊道分区

在城市景观园林设计中,由于绿化斑块聚集,区域复杂,难以实现对遥感信息光谱特征的有效提取,制约城市景观设计科学规划。提出一种基于绿化斑块合并技术的景观格局光谱绿化廊道分区处理技术,首先进行城市绿化景观格局模型构建,分析城市绿化景观生态风景园林设计的现状,设计绿化斑块合并技术,提出绿色景观格局分析的绿化廊道光谱特征提取算法。实现对城市绿化景观格局的光谱绿化廊道的分区处理方法改进。研究结果表明,该方法能有效对城市景观中的绿化廊道进行特征提取和廊道分区,廊道分区的峰值信噪比提高,为城市景观和风景园林建设提供准确的数据依据。