Growing Communities: Integrating the Social and Economic Benefits of Urban Agriculture in Cape Town

There has been growing interest in the use of urban agriculture to address food insecurity and poverty in Cape Town. This reflects debates on urban agriculture in the global south. In the north, growing food in cities has been tended to be framed in terms of its social benefits. This paper investigates the perceived benefits of urban agriculture in projects in Seawinds and Vrygrond in Cape Town. Using the concept of metabolic rift is argues for connections between northern and southern constructions of urban agriculture. This approach enables connections to be seen between the practice in seemingly different areas without losing the local context. The paper argues that by using this integrated approach, projects may be more sustainable and ultimately provide both clearer social and economic benefits.     

Neural correlates of individual differences in strategic retrieval processing.

Processes engaged when information is encoded into memory are an important determinant of whether that information will be recovered subsequently. Also influential, however, are processes engaged at the time of retrieval, and these were investigated here by using event-related potentials (ERPs) to measure a specific class of retrieval operations. These operations were revealed by contrasts between ERPs elicited by new (unstudied) test items in distinct tasks, the assumption being that these contrasts index operations that are engaged in service of retrieval and that vary according to the demands of different retrieval tasks. Specific functional accounts of this class of retrieval processing operations assume that they influence the accuracy of memory judgments, and this experiment was designed to test for the first time whether this is in fact the case. Toward this end, participants completed 2 retrieval tasks while ERPs were acquired, and the extent to which processes were engaged differentially across tasks in service of retrieval was operationalized as the magnitude of the differences between the new-item ERPs that were elicited. This measure correlated positively with response accuracy on the tasks, which provides strong evidence that this class of retrieval processing operations benefits the accuracy of memory judgments. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于单片机的时序测试系统设计

针对某特殊应用条件下的时序测试需求,设计了一套基于单片机的测试系统,系统以STC12C2052单片机作为测试的基础硬件,完成逻辑控制、数据采集以及数据处理、测试结果传输等功能,具有结构简单、体积小、性价比高等特点.上位机部分的软件基于VC++6.0设计,主要完成测试数据存储和显示功能.单片机与上位机间通过串口进行通信,经实验证明该系统的测试结果误差较小,工作稳定,完全能够满足实际测试需要,结合上位机能方便的进行历史数据查看和时序波形对比.     

配电网开关站高可靠性接线模式比较研究

由于开关站传统接线模式难以适应城市重要地区的可靠性需求,文中介绍了3种满足"N-2"安全准则的新型开关站接线模式,以及它们在各种状态下的运行方式、开关站供电能力和线型选择的匹配关系、保护配置方案等。然后利用单位负荷最小年费用法对开关站的各种接线模式进行了经济性指标比较。为了精确量化新型接线模式的可靠性优势,提出一种考虑高阶失效事件并计及负荷转移耗时的算法,并应用于可靠性分析。对各模式的负荷转移能力、出线间隔利用率也进行了比较。最后,总结了3种新型接线模式的适用场景。     

基于模糊隶属度的电力系统抗差估计

提出了一种电力系统模糊自适应抗差估计(fuzzy adaptive robust estimation,FARE)方法。计及了量测权重的不确定性,以连续的模糊隶属度评价测点的优劣,很好地解决了测点非优即劣的问题,以最小化测点劣质性的加权模糊隶属度之和为优化目标,采用原对偶内点法(Primal-Dual Interior Point Method,PDIPM)求解,并且实现了对量测粗差的自适应。多个IEEE标准算例以及波兰系统的仿真测试结果表明,该方法具有良好的抗差性能。     

The impact of childhood symptoms of conduct disorder on driver aggression in adulthood

Background

Despite limited empirical investigation, existing scientific literature suggests that individuals with a history or current diagnosis of conduct disorder (CD) may be more likely to demonstrate reckless and aggressive driving. Much of the limited research in this field examines the impact of childhood CD on driver behaviour and collision risk in young adults. Few if any, studies assess the impact of this disorder on driver behaviour beyond age 21 years. The current research is a population-based study of the impact of CD symptoms during childhood on the risk of engaging in driver aggression during adulthood.

Methods

Data are based on telephone interviews with 5230 respondents who reported having driven in the past year. Data are derived from the 2011–2013 cycles of the CAMH Monitor, an ongoing cross-sectional survey of adults in Ontario, Canada aged 18 years and older. A binary logistic regression analysis of self-reported driver aggression in the previous 12 months was conducted, consisting of measures of demographic characteristics, driving exposure, problem substance use, alcohol- and drug-impaired driving, symptoms of attention deficit hyperactivity disorder, and childhood (before age 15) symptoms of CD.

Results

When entered with demographic characteristics, driving exposure, and other potential confounders, childhood symptoms of CD increased the odds of reporting driver aggression more than two-fold (adjusted OR = 2.12). Exploratory analyses of the interaction between childhood symptoms of CD and age was not a significant predictor of driver aggression.

Conclusions

Results suggest that symptoms of CD during childhood are associated with significantly increased odds of self-reported driver aggression during adulthood. Limitations and future directions of the research are discussed.     

测绘成果管理系统的设计与实现

测绘成果管理系统是以测绘成果数据管理为核心,以生产管理、生产作业人员共同参与的综合性交互平台。系统基于．NET框架平台开发,服务器端采用最新的WCF技术,客户端采用Extjs3．2框架技术,最终实现测绘成果数据的综合管理、网上浏览、批量录入与转移、快速检索、属性提取及备份恢复等功能,使测绘成果管理工作达到科学、规范、高效。     

The Singapore buildable design appraisal system: a preliminary review of the relationship between buildability,site productivity and cost.

This paper presents preliminary findings of a study to examine the relationship between site productivity, construction costs and the ‘buildable score’ of a buildable design appraisal system recently developed by the Singapore Construction Industry Development Board. The buildable score for a building is a numerical figure computed by taking into account the level of standardization, simplicity and extent of integrated elements used in the design of a building. The stated objective of the appraisal system is ‘to promote more buildable designs in the industry through assessing the contribution of design to site efficiency and produc6 tivity’. Empirical results from 37 completed building projects provide support for the appraisal system's proposition that ‘a design with a higher buildable score will result in more efficient labour usage in construction and therefore higher site labour productivity’. However, the relationship between construction costs and buildable score is less distinct.     

Printability of elastomer latex for additive manufacturing or 3D printing

Additive manufacturing, sometimes referred to as 3D printing is a new, rapidly developing technology which has the potential to revolutionize fabrication of certain high value, complex products. Until now conventional elastomers have not been widely used in the additive manufacturing process. The goal of our work was to determine the feasibility of additive manufacturing using ink jet printing of elastomeric latex materials. Particle size, viscosity, and surface tension were measured for five different latex materials—poly(2‐chloro‐1,3‐butadiene), carboxylated styrene‐butadiene rubber, carboxylated butadiene‐acrylonitrile copolymer, natural rubber, and prevulcanized natural rubber. The XSBR latex was predicted as the one most likely to be printable. Printing trials carried out with the XSBR as the ink proved it to be printable, although technical problems of agglomeration and print head clogging need to be addressed and both the material and process need to be optimized for consistent printing to be achieved. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 42931.