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181.
Salami Olasunkanmi Ismaila Kolawole Taofik Oriolowo Olusegun Gabriel Akanbi 《International journal of occupational safety and ergonomics》2013,19(4):607-611
This study aimed to assess cardiovascular strain during sawmilling operations in terms of physical workload, based on heart rate changes. We measured resting and working heart rates and calculated cardiovascular load (%CVL), cardiovascular strain (%CVS) and relative heart rate (%RHR) in 35 sawmill workers. Based on heart rate only, the work in sawmills was classified as very heavy and extremely heavy. Similarly, a high-level category was recorded for %CVL and a very high range for %CVS. Thus, the workload in sawmill operations is usually very high and can lead to physiological strain of the workers. There is a need to redesign the work content of this occupation to prevent excessive strain in the workers, as this will increase their productivity and reduce their health risk. 相似文献
182.
Olaf Oehme Ludger Schmidt Holger Luczak 《International journal of occupational safety and ergonomics》2013,19(4):419-430
Augmented Reality uses Head Mounted Displays (HMD) to overlay the real word with additional virtual information. Virtual Retinal Displays (VRD), a new display technology, no longer requires Liquid Crystal Displays (LCD). VRD technology addresses the retina directly with a single laser stream of pixels. There are no studies on the user’s informational strain in this new VRD technology. Various papers have shown that Heart Rate Variability (HRV) is a valid indicator for the user’s informational strain. An empirical test revealed no difference in the user’s HRV between VRD technology and LCD technology. Consequently, there seems to be a comparable user informational strain regarding the display types. 相似文献
183.
Thomas Stüdeli Marino Menozzi 《International journal of occupational safety and ergonomics》2013,19(4):441-451
An ergophthalmological tool has been developed to investigate effects of subjective and objective workload on work-related visual complaints (asthenopia). In field studies on different visual display unit (VDU) workplaces effects of objective and subjective workload, work intensity, and work breaks (5-9 min/hour) could be found. It could be shown that during the first hours of VDU work, asthenopic complaints have the tendency to follow effective workload. With increasing working time the effect of a general and visual fatigue overlaps other reported visual complaints in the majority of cases. 相似文献
184.
Raija Ilmarinen Helena Mäkinen Anne Punakallio Heikki Kervinen 《International journal of occupational safety and ergonomics》2013,19(1):7-18
Fire fighters are normally overprotected during their working hours because of the tendency to keep the personal protection level sufficiently high in case of the worst possible scenarios. This study investigated the effects of task-fitted protective clothing on thermal strain in fire fighters as compared to EN 469:2005 protective clothing during a prolonged (2 1/2 hrs) job-related rescue drill under neutral and hot climates. The subjects were 23 healthy, physically fit professional male fire fighters aged 26–44 years. Measurements included cardiovascular and thermal responses and subjective assessments. Wearing task-fitted clothing during rescue tasks in a neutral climate considerably reduced total thermal and cardiovascular strain in prolonged rescue work. The fire fighters also perceived physical work as significantly harder on average, and reported more intense subjective discomfort while wearing EN 469:2005 as compared to task-fitted clothing. 相似文献
185.
Pongjan Yoopat Pornkamon Toicharoen Thirayudh Glinsukon Kamiel Vanwonterghem Veikko Louhevaara 《International journal of occupational safety and ergonomics》2013,19(1):83-93
This study consists of assessments of the thermal environment and physio-logical strain in tasks associated with airport, construction, and metal jobs. The number of male and female participants was 108. Environmental heat stress was evaluated with the WBGT index. Physiological strain was evaluated by the relative cardiovascular load (%CVL) based on the measurements of heart rate. Also the increase of body temperature, weight loss, and perceived discomfort were determinated. At work sites the assessments lasted for 2 to 4 hrs for each participant. The mean physiological strain exceeded the level of 30%CVL. Severe peaks (over 60%CVL) were observed in specific tasks being in agreement with perceived discomfort ratings. The increase of body temperature and weight loss in most cases remained within acceptable limits. For the most strenuous tasks, various ergonomic improvements were developed in consultation with workers and managers. 相似文献
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187.
使用滇黔地区钻孔应变观测台站的资料,对2012年9月7日彝良Ms5.7地震前异常现象进行分析,结果表明,震前昭通、贵阳台钻孔应变出现长趋势等异常,其他台站在震前几小时到5天出现曲线异常波动、固体潮变形等异常现象。 相似文献
188.
189.
Xingdu Chen Chengjian Yang Weiwei Wang Bizhou Ge Jun Zhang Yucan Liu Yaping Nan 《环境科学学报(英文版)》2017,29(3):88-98
The biodegradation characteristic and potential metabolic pathway for removal of environmental N,N-dimethylacetamide (DMAC) by Rhodococcus sp. strain B83 was studied. Rhodococcus sp. strain B83 was isolated from the rhizosphere of a pagoda tree and proved capable of utilizing DMAC as sole source of carbon and nitrogen. Batch culture studies showed that strain B83 could tolerate up to 25 g/L DMAC and showed distinct growth on possible catabolic intermediates except for acetate. The nitrogen balance analysis revealed that approximately 71% of the initial nitrogen was converted to organic nitrogen. DMAC degradation has led to accumulation of acetate and organic nitrogen, meanwhile traces of nitrate and ammonia was build-up but without nitrite. The growth of strain B83 could be inhibited by adding exogenous acetate. By means of the assay of enzymatic degradation of DMAC, several catabolic intermediates at different intervals were observed and identified. Based on the results obtained from culture solution and enzymatic degradation assay, a detailed pathway is proposed for DMAC biodegradation. 相似文献
190.
为开发极端环境工业用酶,从新疆盐碱土微生物中分离得到一株中度嗜盐高产淀粉酶活性菌株H3,其能耐受30%盐浓度和pH 11的极端环境.通过形态特征、生理生化实验及16S rRNA基因序列分析,确定H3属于Gracilibacillus属.该菌株能在盐浓度为0~30%的培养基上生长,最适生长盐浓度为5%~10%,最适pH值为8.5.在最适生长盐浓度、pH条件下,其淀粉酶活性可达到4 830个活力单位,可用于高盐高碱环境下淀粉的水解. 相似文献