Nature inspired 21 branches sneezewort/Achillea ptarmica plant growth pattern–shaped antenna for Ku‐band applications

This reported paper presents the design and analysis of wideband nature inspired planar antenna of 46 × 18 × 1.6 mm³ size, designed using FR4 (Flame Retardant) substrate. The antenna patch is delineated from the growth pattern of sneezewort plant with supplementary notion of golden ratio in branching and branch width. The total number of branches in each stage follows the Fibonacci series and the branch width is calculated from the golden ratio concept. Starting from one feed line and two branches, the maximum numbers of branches are increased to 20. There has been significant enhancement in the radiation performance of proposed geometry by increasing the number of branches to 21 and by modifying ground with T‐shaped slot. The antenna covers wide impedance bandwidth of 8.2 to 16.5 GHz by possessing stable radiation characteristics.     

Paste backfill of high-sulphide mill tailings using alkali-activated blast furnace slag: Effect of activator nature,concentration and slag properties

The effect of activator type, concentration and slag composition on the strength and stability properties of paste backfill (CPB) of high-sulphide tailings using alkali-activated slag (AAS) as binder (7 wt.%) were investigated in this study. Acidic and neutral (AS–NS) slags were activated with liquid sodium silicate (LSS) and sodium hydroxide (SH) at 6–10 wt.% concentrations. Ordinary Portland cement (OPC) results were used for comparison. The strength development was found to remarkably improve with increasing the concentration from 6 to 8 wt.%. Further increase in concentration did not enhance the strength. SH was determined to produce higher early-age strength whilst LSS produced higher long-term strengths as an indication of slag selectivity for activators. More extensive gypsum formation was observed at lower concentrations in SEM/EDS studies. An increase in Na₂O concentration raised the activator consumption. High concentrations also led to poorly crystallized C–S–H gel, loose structure and drying shrinkage cracks especially in NS–SH samples. A reduction in total porosity up to 20% was obtained in AAS samples compared to OPC. Amorphous structure, chemical modulus ratio and/or basicity index (BI) values were seen to control the pozzolanic reactivity, and therefore, the alkali-activation and hardening process.     

溶剂法制备天然橡胶结合胶的研究

结合胶是未硫化的混炼胶中不能被其良溶剂溶解的那部分橡胶。用化学溶剂法制备结合胶具有药品用量小、实验过程操作简单,重现性好等优点。通过讨论橡胶加入量、炭黑用量、反应时间、静置时间等因素,确定了溶剂法制备结合胶的最佳工艺参数,并与混炼法制备的结合胶进行了性能对比。结果表明,橡胶在甲苯溶液中的质量浓度约为0.02g/mL、橡胶和炭黑的质量比为2∶1、反应时间为14h、静置时间为72h的工艺参数下,可以制得高质量结合胶。混炼法制备的结合胶的质量比溶剂法制备的结合胶的质量大。但是其具有与溶剂法结合胶相同的抽提温度曲线,在结合胶的实验研究中,可以用溶剂法代替混炼法。     

《环境化学导论》教学中环保意识的培养

随着经济的快速发展,人类赖以生存的环境也遭到了前所未有的破坏,保护环境已经成为当前全球性的重要课题。通过《环境化学导论》选修课程培养非环境专业学生的环境保护意识,树立人与自然和谐相处的环保理念是任课教师不可推卸的责任。     

青藏高原自然保护地与乡村社区共生模式研究——以孟达国家级自然保护区为例

通过对青藏高原自然保护地建设问题的分析,认为保护地与乡村社区二者关系的研究是保护地建设的关键。根据对保护地与乡村社区关系的回顾,认为从空间营造的角度探讨保护地与乡村社区共生模式是解决青藏高原保护地建设的重要途径之一。以孟达国家级自然保护区为例,分析保护区与乡村社区共生关系的形成、演变机制,提出保护区与乡村社区共生界面——小流域是问题研究的重点。分析共生界面的特征,提出3种尺度的营造策略——小流域景观规划、乡村聚落重构与绿色建筑营造。流域尺度强调上游河源区的生态保护,中游河谷的生态保育和下游河口区的生态修复;聚落尺度提出将社区作为景观资源与旅游设施的重构策略;院落尺度利用绿色建筑技术营造新型民居,实现重构聚落的核心内容和小流域景观规划的重点环节,回应保护区资源环境保护与社区发展之间的矛盾关系,促进保护区与社区共生模式的形成。     

北京世园会世界园艺展示区公共景观的实践与思考

对2019年北京世界园艺博览会世界园艺展示区的公共区景观设计背景、公共景观设计逻辑、主题线索的选择及重点设计内容进行了阐述。通过该项目实践,探索国际级专业园林艺术博览会公共区景观设计中,将人的行为事件作为场地设计推动力,将人的主观性与自然的存在性有效融合的方法与途径。结合项目设计重点区域,着重谈论了"种子的故事""蝶恋花"和"老树记忆"3条设计线索的演绎,阐释与表达人与自然的和谐共生关系。希望该项目能传递设计者对于自然、对于生命的尊重与情感的表达,创造出与自然山水和谐共生的现代景观。     

Home,the culture of nature and meanings of gardens in late modernity

The growth in the provision of gardens has been an important feature of housing in the UK during the 20th century, and yet the significance of the humble domestic garden has been neglected in studies of housing and home. This paper examines the role of the garden in the meaning of home, and draws on theoretical discussions of nature, environmental risk and social uncertainty in late modernity. Secondary empirical data is used to investigate the changing uses of gardens and practices of gardening. A survey of garden owners provides primary empirical data to examine meanings of gardens and personal experiences of nature. The paper concludes that the garden is an important site for privacy, sociability and sensual connections to nature, and these activities can be understood as negotiations and practices to address the social and environmental paradoxes of late modern life.     

试论城市的自然保护及绿地建设途径

论述了城市自然保护的内容及特点，认为拓展城市绿地建设内容，用生态学理论来指导城市绿地建设，重视景观生态过程的重建是实现城市自然保护的主要措施，城市绿地生态网络是指导绿地生态规划的一个新的空间概念。     

还原真实的设计

本文结合中国建筑设计的现实情况,对维克多·帕潘 尼克的《为真实的世界设计》一书中提出的"为人们所需要的设 计甚于为人们所想要的设计"这一命题做深入的分析,提出应该 思索设计的本源,理解设计师自身的价值,并说明了新的设计思 路--建筑策划和公共参与的必要性。     

新建筑的呼唤--绿色和人文及健康

通过对“绿色建筑”、“人文建筑”、“健康建筑”的概念、意义及具体做法的介绍,体现新建筑的三大需求,展望建筑业的发展方向,从而加快建筑业的发展进程。