窨井盖设计:创意与功能的定位考察--从城市规划的文化品位视角

本文介绍了欧美国家及日本的城市窨井盖创意思路,剖析了我国城市规划中窨井盖设计的问题及现状,提出了在保证窨井盖实现其市政设施功能的同时,赋予其更多的功能,如：指示路标功能、广告宣传功能、传承地方文化功能等。本文意在强调要以新颖的设计创意与多元功能定位的思路,给予窨井盖以持久鲜活的生命与活力,增添文化元素,提高窨井盖功能,这有助于提升市政规划的文化品位。     

Assessing High-Speed Rail’s impacts on land cover change in large urban areas based on spatial mixed logit methods: a case study of Madrid Atocha railway station from 1990 to 2006

This paper proposes an accessibility-based spatial mixed logit (SML) model with panel data structure to examine the impacts of High-Speed Rail (HSR) on land cover change in large urban areas. Using data between 1990 and 2006, impacts of the Spanish HSR on Madrid’s Atocha railway station influence area – a 20 km radius buffer centred on the station – were investigated. To model the HSR impacts, besides socioeconomic variables, the development of both local and regional transportation networks with corresponding accessibility improvement is also taken into account to segregate the impacts of land-cover change brought by different sources of accessibility measures. In this study, two SML models are used: one incorporates regional accessibility indicators as a base model, and the other does not, acting as a control model. The model estimation results reveal that the reduction of the local and regional weighted travel average time has positive impacts on the Atocha station catchment area’s urbanised land-cover rates. Although the base and control models both achieve high goodness-of-fit values, the base model that considers regional accessibility reveals a better goodness-of-fit statistic and is more robust than the control model. It is concluded that the improvement of regional accessibility due to the arrival of HSR at Atocha station plays an essential role in the urbanisation of land cover changes in the study area.     

集成遥感与GIS技术的土地利用动态变化监测方法研究

尽管国内外已发表了许多利用两个或两个以上时相遥感影像进行土地利用动态变化监测的研究成果,但鲜有基于单时相遥感影像与土地利用现状图进行土地利用动态变化监测的研究成果出现。本文将以土地利用现状GIS数据和高分辨率遥感影像为数据源,探讨利用GIS数据和相应分辨率的单时相遥感影像进行土地利用动态变化监测的有关技术方法和技术流程,并通过实验验证方法和技术流程的有效性和可行性。     

基于CAE的注塑件成型缺陷预测与优化

为缩短产品开发周期,降低成本及提高产品质量,CAE技术越来越多的运用在注塑成型的模具设计中。本文基于AMI对接收器上盖在注射成型过程中的成型缺陷进行预测和优化,为探讨注塑成型应用CAE的方法提供借鉴。     

浅谈地被植物在园林设计中的应用

在我国,随着园林绿化事业的发展,在园林配置中,地被植物得到广泛的应用,并凭借自身的特殊性,通常能够起到画龙点睛的作用。本文通过分析地被植物的概念及特性,将其进行分类,针对地被植物在园林设计中应该遵循的原则及其在园林绿化中常用的几种应用形式进行了探讨,以期通过本文的阐述能够对园林绿化设计有所帮助,更好的将地被植物运用到环境美化当中去。     

略论农业科技期刊封面设计的地域文化性

地域文化是期刊美术工作者可以深度挖掘的艺术宝藏。文章以《农村新技术》杂志为例,分析了期刊美术设计引入地域文化的重要性,并从突出地方特色、抓典型、求真实等方面作了较全面的论述,说明引入地域文化资源和自然资源对构筑农业科技期刊特色品牌、扩大期刊的知名度和传播力、提升中华文化的世界影响力之意义重大。     

Mapping changes in land use/land cover and prediction of future extension of bowé in Benin,West Africa

Desertification and land degradation are worldwide problems affecting soil, vegetation and the livelihoods of rural populations. Bowal (plural bowé) is a particular form of degraded land that occurs in tropical regions and leads to the exposure of ferricretes, which are unsuitable for farming. Bowé are more common on farmland and degraded savanna. Changes in land use/land cover were used to map a region of 6.7 million ha in northern Benin, West Africa in 1975, 1990 and 2010. The changes observed during these periods (1975–1990, 1990–2010 and 1975–2010) were used to predict the occurrence of bowé in the period up to 2050 using Markovian chain analysis. The results showed a considerable change in land use/land cover during the three periods. The types of land on which bowé occur (farmland and degraded savanna) increased in northern Benin by 5.4% per year during the period 1975–1990 and 9.5% per year during the periods 1990–2010, while the natural vegetation (forest, woodland and tree savanna) decreased by the same amount. The future scenarios also predicted the same trend. In the period 1975–1990, 1.28 million ha (26%) of natural vegetation was converted to degraded savanna and farmland while 2.23 million ha (53%) of natural vegetation was converted to degraded savanna and farmland in the period 1990–2010. Based on the dynamics recorded during the period 1975–1990 and 1990–2010 respectively, a total of 1.28 million ha (26% of the natural vegetation that was present in 1975) and 1.29 million ha (31% of the natural vegetation that was present in 1990) will be converted to farmland and degraded savanna in the study area by 2050.Thus bowalization will persist and increase in the period up to 2050. The natural vegetation could disappear if protection and restoration measures are not taken. It is thus important to take measures to stop the degradation and to implement programs to restore soils on bowé based on the soil and water conservation techniques used on highly degraded West African soils, such as zaï pit and stone rows with grass strips. Some native plants species adapted to bowalization and resistant to climate change in northern Benin (e.g. Asparagus africanus, Andropogon pseudapricus and Combretum nigricans) should be used in association with soil and water conservation techniques on bowé.     

Urban encroachment,forest regrowth and land-use institutions: Does zoning matter?

As concern grows regarding urban sprawl and forest and agricultural land preservation, the effectiveness of land-use policies in shaping land-use change warrants further study. We evaluate the impact of county-level zoning laws, the most predominant land use policy in the USA, and land rents on the relative amounts of forest, agricultural, and developed land, while controlling for demographic information and taxation rates. Over the past decades, southern Indiana has experienced forest regrowth on private lands, but this regrowth has declined in recent years with increased conversion of open space for urban residential development. We develop a model of land-use shares in 40 southern Indiana counties based on the net benefits to agriculture, forestland, and urban uses using a maximum likelihood estimation of a Dirichlet distribution. We find agricultural land rent and indicators of land productivity are the most important predictors of the proportion of agriculture and urban uses. Forest use is better explained by shifting regional economic structure and hilly terrain. Counties with a greater proportion of their work force in the service sectors have a greater proportion of land forested. Finally, to some extent zoning may protect agricultural land in the region, although land rents, land characteristics, and population are strong predictors of the ratio of agriculture to urban use.     

Rural-urban gradient analysis of ecosystem services supply and demand dynamics

Urban regions are important places of ecosystem service demands and, at the same time, are the primary source of global environmental impacts. Although there is broad agreement on the importance of incorporating the concept of ecosystem services into policy strategies and decision-making, the lack of a standardized approach to quantifying ecosystem services at the landscape scale has hindered progress in this direction. Moreover, tradeoffs between ecosystem services and the supply/demand ratio of ecosystem services in urban landscapes have rarely been investigated. In our paper, we present a method to quantify and map the supply and demand of three essential provisioning services - energy, food, and water - along the rural-urban gradient of the eastern German region Leipzig-Halle. This urban region has experienced significant socio-economic dynamics and land use changes since the German reunification in 1990. The results show that both the demand and the supply of ecosystem services changed considerably during the time span under consideration (1990-2007). We identified an increasing supply/demand ratio of food and water but a decreasing supply/demand ratio of energy. In addition, the pattern of ecosystem demands shows a levelling of rural-urban gradients, reflecting profound modifications of traditional rural-urban relationships. The changes of ecosystem service supply gradients are determined more by land use intensity, such as the intensification of agricultural production, than by land cover changes such as urban sprawl. The comparison of supply/demand ratios and rural-urban patterns of ecosystem services can help decision-makers in landscape management in striving for a sustainable balance between resource supply and demand.