太行山野猪不同杂交组合生长及屠宰性能测定

选择体重30kg左右的太行山野猪与长白猪、汉普夏、上海白猪的杂种猪分为9组,每组12只,公母各半,进行饲养试验,测定太行山野猪不同杂交组合的生长性能。饲养试验结束后,每组随机选择4头屠宰,进行屠宰性能测定。结论:①野猪血缘含量越高,生长性能越低。②长白猪与野猪的杂交组合比其他杂交组合有较好的生长性能。③野猪血缘含量越高,瘦肉率越高。④汉普夏猪与野猪的杂交组合比其他杂交组合有较好的屠宰性能。     

具有模糊可选时间窗的VRPSPD问题及其混合遗传算法

在经典VRP问题的基础上引入了模糊预约时间和可选时间窗的概念,从顾客满意的角度研究了具有同时配送和回收的车辆路径优化问题,建立了求解此问题的多目标混合整数规划模型,设计了求解此模型的混合遗传算法,并对已有文献中的算例进行了估算求解,估算结果表明,基于2-opt的混合遗传算法在求解没有时间窗约束的VRPSPD方面有比较好的性能.     

油电混合动力汽车双转子电机集电环的应用研究

文章研究了集电环在油电混合动力汽车双转子电机中的应用,在混合动力系统转速高、电流大、可用空间小等条件约束下,实现集电环的高寿命、低温升,而且故障少,可靠性高。     

宽带IP接入技术

随着社会科技的发展,通信网络正发生着深刻的变革,宽带化成了电信发展的必经之路。本文主要概述了宽带接入技术中数字用户线路、混合光纤同轴网这两个比较重要的主流技术,分析各自的优缺点。并着重阐述了ADSL,HFC这两个重要的技术。     

高斯型混合双多模噪声模型分析

本文以一类高斯型混合非高斯噪声双模噪声为背景噪声,详细分析了二进制数字调制系统的抗噪声性能。为研究更一般的情形,本文提出了窄带多模过程的数学模型,进行了较详细的研究,给出了混合噪声中信号检测的一般方法,是对原建立在高斯噪声基础上通信与信号处理理论的完善和补充,有一定的普遍意义。在理论分析的基础上,最后给出了仿真结果并进行了分析。     

The Market Quality of Dealer versus Hybrid Markets: The Case of Moderately Liquid Securities

Abstract:  Over the last decade, electronic limit-order trading systems have been sweeping securities exchanges around the world. This paper studies a transitional case, namely, the commencement of trading of a group of moderately liquid stocks on SETS of the London Stock Exchange. The evidence reveals that the liquidity of those stocks dropped substantially after the introduction of the limit order book and the removal of the market makers' obligations. This transition provides an example that a hybrid market with a limit order book and voluntary dealers may not perform as well as a dealership market with obligatory market makers.     

Exploring combined tourist offerings: the case of sightrunning

This study provides preliminary empirical insight into the contemporary tourist phenomenon of sightrunning. This combined offering simultaneously concurs with and evades theoretical perspectives of hybrid tourists, sport tourism, cultural tourism and urban tourism, favouring examination of such phenomena through first-hand experiences of the participants. For the purpose of the empirical study, automated content analysis was applied in order to analyse 858 reviews of sightrunning tours extracted from Tripadvisor web pages. Results reveal that running is the dominant concept, which refers to a gratifying ‘way to see and experience the city’ (rather than the sights). Additional concepts and themes, such as knowledgeable guides and proper pace, further mediate and effect participant experiences. Findings suggest that sport tourists might be concurrently interested in involving cultural experiences, and this offers some preliminary theoretical and managerial implications. They namely identify the potentially neglected tourist segment, which is of relevance for conceptualization, research and management of tourist offerings and experiences from (and beyond) the perspective of ‘running shoes’.     

Estimation and validation of hybrid choice models to identify the role of perception in the choice to cycle

Cycling is one of the most sustainable and ecofriendly modes of travel and a good form of exercise. Many government and public health authorities recommend cycling to stay fit as well as to reduce air and noise pollution, CO₂ emissions, traffic congestion, and other negative consequences of car use. In light of these benefits, a major challenge for researchers today is how to promote cycling. However, in countries where cycling is not common, apart from the need for proper cycling facilities, one major issue concerns people’s perception of cycling for sport or recreational activities rather than as a mode of transport. The aim of this paper is to explore the role of perception in the likelihood of the bike being used for utilitarian purposes. We focus on the perception of: the bicycle as a means of transport; bikeability (in terms of usefulness and safety) and of bike infrastructure. Hybrid Choice Models (HCMs) have been used to estimate the effect of people’s perception on the propensity to bike. The HCM also accounts for the serial correlation between error terms in the discrete and latent perceptions, to allow for agent-common unknown factors. Furthermore, we also validate the model results using a hold-out sample and discuss some policy measures aimed at changing travel behavior. The results suggest that, besides individual characteristics, latent aspects related to the perception of the context and of the bicycle as a means of transport strongly affect the propensity to cycle.     

Development of a methodology for the characterization of urban and periurban green spaces in the context of supra-municipal sustainability strategies

Periurban landscapes should be interpreted as multifunctional spaces enabling them to be valued according to environmental, economic and social criteria. This article proposes a methodology for the characterization of urban and periurban green spaces in the context of strategies which enable planning processes for cities of the future to be devised. Firstly, the green belt is characterized and evaluated and its resilience and dynamic analyzed. Subsequently, different supra-municipal tools are compared and a summary of various existing methodologies and programs is produced, making it possible to develop a matrix for diagnosing projects for green spaces and periurban natural spaces and evaluating their potential as a Green Infrastructure in the context of Open Space Strategies. The application of this method in the characterization of periurban space emphasizes elements of scenic beauty whose incorporation in the said strategies does not require large investments but instead an effort in terms of promoting such places. The drafting of this Open Spaces Strategy offers a cross-disciplinary planning tool with which to take action using a landscape reading scale. This comprehensive view makes it possible to optimize efforts and investments and involve the whole community at all levels of operation through processes of citizen participation. As a result, a systematic and collective diagnostic tool is obtained for characterizing the urban and periurban green belt, which can be applied to the various periurban spaces in accordance with the multifunctionality demanded by supra-municipal strategies.