Greening potential of derelict and vacant lands in urban areas

This research proposes a more complete, easy and unique method to assess the greening potential of derelict and vacant urban lands in order to prioritize them for reclamation. Greening these lands can convert a problem into an opportunity, assuming that green spaces must fulfill multiple functions, being part of a green infrastructure. The evaluation cover a wide range of criteria that reflect the complexity of the city and consider environmental, ecological, social and economic aspects related to the local urban structure. The criteria were organized into three groups: ecology, stormwater, and community. For each criterion, there are quantitative or qualitative indicators, measured by continuous, binary or multi-categorical parameters converted into numerical values in order to create a ranking score from highest to lowest potential of greening. The city São Bernardo do Campo, in the Metropolitan region of São Paulo, Brazil, was chosen as the case study to apply this method. The city is experiencing a post-industrial process and has few urban green spaces accessible to the community, while there are several empty and abandoned areas. We identified and mapped sixty derelict and vacant lands, of which ten were chosen as samples to evaluate. The results revealed that 40% of evaluated lands have high potential to reclaim into green spaces, 40%, medium potential and 20%, low potential. Nature or vocation as green spaces was also evaluated: 50% of them have social importance, 20%, environmental, and 30% socio-environmental. The vocation is an important information since it identifies some areas that despite their medium-low potential, they should not be rejected due to their social value. The results can drive a preliminary environmental planning decision making, to be applied in any city that faces similar problems of land dereliction, offering support to professionals to prioritize the reclamation of new urban green spaces.     

Green infrastructure practices for improvement of urban air quality

Green Infrastructure (GI) practices have shown to be promising in mitigating the air pollution in urban areas of several cities across the world. GI practices such as trees, green roofs and green walls are widely used in United States and Europe to mitigate the air pollution. However, there is yet limited knowledge available in identifying the most suitable GI strategy for an urban area in improving the air quality. Furthermore, it is evident that Australia is still lagging behind in adapting GI to mitigate air pollution, compared with US and Europe. Therefore, this study analyzed the air quality improvement through several GI scenarios consisting of trees, green roofs and green walls considering a case study area in Melbourne, Australia by using the i-Tree Eco software. The results were compared with case studies in different cities across the world. The results showed that the i-Tree Eco software can be successfully applied to an Australian case study area to quantify the air quality improvement benefits of GI. The results were further assessed with several environmental, economic and social indicators to identify the most suitable GI scenarios for the study area. These indicators were quantified using different methods, to assess the effectiveness of different GI scenarios. The results showed that, trees provided the highest air pollution removal capability among the different GI considered for the study area. Combination of different GI such as green roofs and green walls with trees did not provide a significant increment of air quality improvement however, has provided more local benefits such as building energy savings. The results obtained from this study were also beneficial in developing policies related to future GI applications in major cities of Australia for the air quality improvement.     

走近木工机床数控软件

从国内软件行业的发展入手，分析了国内软件技术的发展历程和落后原因。以此为基础，介绍了国内数控相关软件发展的现状和存在的问题，得出国内木工机床软件发展受限的原因，并介绍了木工机床数控软件的工作平台和主流开发工具。     

农业劳动工具的工具性与音乐性相结合问题

本文拟从音乐的本质入手,揭示农业劳动工具的音乐性,探讨农业劳动工具的工具性与音乐性相结合问题。     

机床液压系统正确维护与保养

机床液压系统的好坏不仅取决于系统设计的合理性和系统元件性能的的优劣,更关键的是如何正确维护与保养。本文以机床液压系统为研究对象,针对企业现场实际常见的问题提出了正确维护与保养的注意事项和关键方法。     

用于高硬度模具钢SKD11的铣刀几何角度优化及试验

在切削淬硬模具钢SKD11中,为开发和选用与生产条件相匹配的具备优化几何角度的高性能铣刀,对专用于高硬度模具钢SKD11铣刀的几何角度进行了优化及试验分析.设计了4类不同几何结构的TiAlN复合涂层铣刀.从切削力、切削振动、切削变形、铣刀耐用度以及铣刀磨损机理等方面对这4类铣刀高速铣削SKD11过程进行了研究,综合评价其铣削性能,确定了在常用的高速加工生产条件下的优化铣刀.所选择的优化槽形铣刀具的寿命比之其他刀具延长3倍,在切削力和切削振动方面,该刀具具有最稳定的表现,而且大小较其他刀具下降70%.     

浅谈数控机床翻新改造策略

针对目前数控设备存在的翻新改造问题，提出了翻新改造策略，确定了不同情况下的改造方案。为机床翻新改造的实施提供了保障。     

HTM-63H型数控机床故障诊断和排除

通过对HTM-63H型卧式加工中心B轴无法回零工作故障、Y轴光栅尺故障和机床运行时主轴故障这三个典型故障现象的分析及处理过程描述，介绍了数控机床现场维修常采用的方法。     

新型城镇化进程中农业补贴制度效率提升研究

农业补贴是各国为促进农业健康持续发展而采用的政策工具，其效果受农业生产特点和宏观经济环境的双重影响。研究从影响农业补贴制度运行及其效率的宏观环境因素出发，分析了新型城镇化战略的实施对农业及其补贴政策的影响。在此基础上，分析了中国农业补贴制度的目标选择，明确了补贴政策工具选择的具体思路，最后提出了中国农业补贴制度效率提升的具体路径和保障机制。     

数控车床工的必备知识和操作技术

论述了数控车床工必须要掌握的数控车床"特点、组成、坐标、面板、模式"五个方面的知识和操作技术。