The whole-body vibration in operation of wheeled and tracked harvester IN PINUS thinning

Technological advances available in wood harvesting machines have provided productivity improvements and more comfort in forestry operations. However, operators may be exposed to whole-body vibration which can lead to a wide variety of health disorders and industry losses. This research aimed to evaluate the exposure of workers to whole-body vibration in thinning harvesting operations comparing two models of harvesters (tracked and wheeled) working in Pinus taeda stands submitted to the first commercial thinning. Whole-body vibration was determined by the three orthogonal axes (X, Y, and Z) using a 3-Axis integrator vibration meter, and the data were analyzed according to the criteria established by the ISO 2631–1:1997 and the European Directive, 2002/44/EC, concerning the resulting acceleration from normalized exposure A (8) and value of the resulting vibration dose value (VDV). The acceleration and vibration levels obtained by the tracked harvester presented mean values of A (8) of 0.6 m/s² and VDV 11.2 m/s^1.75, while by the wheeled harvester, mean values were A (8) of 0.4 m/s² and VDV 9.3 m/s^1.75, respectively. It was possible to verify the expressive vibration from the tracked harvester analysis, the operators were exposed to the whole-body vibration above the limits recommended by the regulating norms.     

Disentangling the effects of efficacy-facilitating informational support on health resilience in online health communities based on phrase-level text analysis

This study examines the different types of supportive messages posted on a forum at online Healthcare communities (OHCs), which facilitate user self-efficacy and response-efficacy and an issue of how such informational messages encourage users to enhance their health resilience via goal-setting for health improvement. We theorize that self-efficacy-oriented messages affect helpfulness, focusing on the efficiency of the implementation, while response-efficacy-oriented messages influence the relationships among helpfulness, goal-settings, and health resilience based on the outcome expectancy. Using a computer assisted approach which allows for the directed content analysis, we test a conceptual model with the text-data collected from an OHC.     

New feature selection methods based on opposition-based learning and self-adaptive cohort intelligence for predicting patient no-shows

Patient no-shows have significant adverse effects on healthcare systems. Therefore, predicting patients’ no-shows is necessary to use their appointment slots effectively. In the literature, filter feature selection methods have been prominently used for patient no-show prediction. However, filter methods are less effective than wrapper methods. This paper presents new wrapper methods based on three variants of the proposed algorithm, Opposition-based Self-Adaptive Cohort Intelligence (OSACI). The three variants of OSACI are referred to in this paper as OSACI-Init, OSACI-Update, and OSACI-Init_Update, which are formed by the integration of Self-Adaptive Cohort Intelligence (SACI) with three Opposition-based Learning (OBL) strategies; namely: OBL initialization, OBL update, and OBL initialization and update, respectively. The performance of the proposed algorithms was examined and compared with that of Genetic Algorithm (GA), Particle Swarm Optimization (PSO), Differential Evolution (DE), and SACI in terms of AUC, sensitivity, specificity, dimensionality reduction, and convergence speed. Patient no-show data of a primary care clinic in upstate New York was used in the numerical experiments. The results showed that the proposed algorithms outperformed the other compared algorithms by achieving higher dimensionality reduction and better convergence speed while achieving comparable AUC, sensitivity, and specificity scores.     

基于居民活动的多尺度城市健康数据融合分析

多尺度的城市健康囊括了身体生理、精神与社会等多方面的健康状态,涉及规划、医学、卫生、建筑、心理等多学科领域。其中,居民活动与人口健康状况、生活行为方式、环境健康风险暴露等多种城市健康因素息息相关。基于居民活动的城市健康研究从以人为本的角度提供了重要的理论指导与科学依据,并呈现出多尺度、多源数据融合的特点。随着全球的城市智慧化建设,多尺度健康数据资源的丰富为基于多学科的健康研究与城市规划治理提供了新的研究方法与应用场景。本文从居民活动的视角出发,梳理了地点、社区与城市三个尺度下已有的城市健康数据融合计算研究,并对数据资源、监测技术、研究方法与应用场景进行了整理。面对当前城市健康研究中普遍存在的忽视人本尺度、缺乏数据融合等问题,本文进一步探讨了数据驱动城市健康的途径。通过结合多种数字化技术、融通多尺度分析方法、推广多主体实施参与,促进多源、多尺度数据在城市健康研究中的融合计算分析,以期指导未来的城市健康研究与人居环境建设。     

西华山钨矿区菜地土壤重金属污染特征评价与健康风险评估

研究赣南西华山钨矿开采对周边菜地土壤和蔬菜的影响,采集矿区17个蔬菜地土样和十个品种蔬菜样,运用SPSS软件分析土壤及蔬菜中重金属含量分布特征,以江西省土壤背景值为参照,采用单项污染指数法、内梅罗综合污染指数法、Muller地累积指数法、Hankanson生态危害指数法和健康风险评估模型分别对土壤进行重金属污染评价、潜在生态风险评估、蔬菜食用安全性评估。结果表明,钨矿区菜地土壤受到严重的重金属污染,其中镉污染最为严重,9号点位高达21.5 mg/kg。17个点位中有16个为重度污染,评估表明研究区具有较强的潜在生态风险,镉为研究区生态风险主要贡献者。蔬菜中镉污染最为严重,饮食摄入风险评估表明,镉致癌风险指数为1.403;对铬、铜、铅、锌四种元素的非致癌风险评估表明:铬非致癌风险指数高达206.01,远远超出美国环保署作出的健康限值,居民通过蔬菜途径摄入的铬和镉对人体健康均存在较大的健康风险。     

Interconnected Approaches to Sustainable Architecture

Is minimising the negative effects of human activity on people and the planet enough, or can we aim even higher? Guest-Editor Terri Peters introduces the concept of superarchitecture: architecture that is not merely sustainable, but offers positive benefits for both human wellbeing and the environment. As demonstrated by the three international case studies she presents, it is applicable not only to healthcare architecture, but also to the spaces in which we live and work, and the wider urban realm. At its heart is a deep connection with nature.     

浅谈工程记录在工程索赔中的作用

工程记录是施工过程中对整个施工过程的详细记录。介绍了工程记录的内容，例如施工日志、气象资料、工程图纸、工程报告、核算资料以及国家法律、法规等等。阐述了工程记录的真实性、关联性、及时性和可靠性。以此工程记录作为索赔证据，就可以拥有主动权、有理有节地向业主索赔、并获得成功。     

Experimental evaluation of the dynamic properties of a wharf structure

This paper presents the results from a series of experimental tests carried out to determine the damping characteristics of a section of a 375 m long pile-supported wharf structure under forced excitation. The test program was designed with two primary objectives: (1) to identify the fundamental damping of the structure by using structural microvibration signals produced by tides, wind and microtremors, and (2) to evaluate the variation of the dynamic properties as a function of response amplitude by applying initial displacements of varying amplitude to the deck using a pull mechanism.Although the wharf was designed as a series of independent deck sections, the study revealed that the non-structural frames and piping supported on top of the wharf tie adjacent sections together and have a significant influence on the dynamic behaviour, particularly in the longitudinal direction. Care must be taken in to provide sliding connections for wharf supported structures or to include the influence of these elements in the original design. From our review of the properties identified under the different excitation levels, it was determined that the wharf has relatively linear behaviour with an equivalent viscous damping of about 3%. This is a good reference damping value to be used for the analysis of the pile-supported wharf structures under operational loads and low magnitude seismic events     

Health-Related Evaluation of Building Products based on Climate Chamber Tests

A procedure is developed for assessing the health effects of the emissions from building products. The procedure is based on:

• ? emission rates measured in environment test chambers
• ? a fixed standard room with fixed standard conditions
• ? a maximum acceptable concentration in the indoor air of each of the chemical compounds emitted, I_v a maximum permissible contribution to I_v from building products.

The procedure has two elements: evaluation of the emitted compound alone and evaluation of the compound together with other compounds and indoor air factors. The evaluation includes odour and health effects of the compounds. The procedure has been applied to the emission test results for two building products: a rubber floor covering, and a water-borne acrylic watt paint. Maximum acceptable indoor air concentrations are listed fin-selected chemical compounds emitted by these two materials.     

浅析城市中心区地铁项目的索赔创效

以昆明地铁某车站项目为例,探讨了城市中心区地铁项目的索赔创效方法,针对该工程实际情况,从工程量入手,进行了变更索赔分析,在此基础上提出了关于索赔的具体措施,以指导施工企业有效索赔,增加效益。