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排序方式： 共有943条查询结果，搜索用时 15 毫秒
1.
南宁遭受50年一遇的长期阴冷型天气,使广西亚热带作物研究所多种植物种类（品种）遭受寒（冻）害,本文重点调查收集了龙舌兰麻、棕榈类植物、热带亚热带果树、园林绿化乔灌木等植物受害情况,并提出寒害植株的处理措施,为今后热带亚热带植物种质资源的收集保存提供宝贵资料,并对其开发利用提供科学依据。 相似文献
2.
选煤厂供配电系统的节能降耗,要减少线路损耗,提高供配电系统的功率因数,异步电动机无功补偿,变压器节能,低压配电系统的优化,加强供配电系统管理、促进节能降耗。 相似文献
3.
Matz Dahlberg;Linna Martén;Björn Öckert; 《The Scandinavian journal of economics》2024,126(3):440-464
We examine how workers adjust in response to an unexpected job loss. Using the closure of military bases in Sweden, we find that displaced workers experience permanent income losses and immediately adjust along two main channels: regional and sector mobility. Displaced military workers are more likely to move to another municipality, start commuting, and change sectors. We also find that workers with mobility restrictions are less likely to change regions and they exhibit lower earnings in the longer run, a result that might help to explain some of the permanent income losses found in the literature. 相似文献
4.
Natalia Ramondo 《The Scandinavian journal of economics》2009,111(4):789-809
This paper presents new evidence on foreign plants and their effects on a host industry. I test the predictions of a Melitz‐type model using a panel of domestic and foreign plants in the Chilean manufacturing sector. Foreign ownership is a strong predictor of plant productivity and size advantages. Moreover, productivity gains for a domestic incumbent are positively associated with foreign plants' presence in the same industry and region. I also find a positive correlation between foreign entry and exit of less productive domestic plants, but inconclusive evidence on the effects on productivity of new domestic plants. 相似文献
5.
城市功能拓展区既缺少核心区集聚的文化资源优势,又缺少郊区低廉的发展成本优势,但在着力发展文化创意产业的过程中,却可以通过整合文化产业园区资源,形成独特的发展优势.本文运用商业生态学理论,分析城市功能拓展区内文化产业园区发展的“三元”联动主体,构建园区资源整合的双重主体理论,并提出文化产业园区确定主导产业并吸引核心企业以“聚核”、拓展纵向产业链和横向服务链以“聚链”、打造公共平台并进行功能体系建设以“聚网”的“三聚”持续发展路径. 相似文献
6.
寒地城市具有特殊的气候特点和人文特色,园林小品在寒地城市街旁绿地设计过程中具有重要的作用。只有克服寒冷气候对园林造景的不利影响,充分挖掘寒地城市的特色,并将其体现在街旁绿地的园林小品设计过程中,才能提高户外绿地的吸引力,为居民提供舒适的体闲环境。 相似文献
7.
傅铁英 《石油化工技术经济》1999,15(4):22-26
７０ｋｔ／ａ聚丙烯国产化流程是中国石化集团公司化工工程公司十几年来在聚丙烯工程设计上实践经验的结晶。通过消化吸收国外技术,提高设计国产化水平,设备国产化国产化力度,使实际发生的工程建设费用大幅度降低。不断改进工艺技术,实现国冰化,形成先进的工艺技术,不断优化工程设计方案,推行多版次设计,设计、采购、施工合理交叉,缩短建设周期。设计向采购、施工管理延伸,在提高工程建设过程中的技术含量,降低投资,保证 相似文献
8.
Junaidah Zakaria Che Rosmani Che Hassan Mahar Diana Hamid Ezrin Hani Sukadarin 《Process Safety Progress》2020,39(1):e12096
Statistics in Malaysia show accident cases in the manufacturing industry is the highest as compared to another sector. The concept of safety climate gained interest in many industries as a means of reducing accident. This study assessed workers' perceptions toward safety climate factors, management commitment, communication, a priority of safety, safety rules procedures, social environment, supportive environment, involvement, personal priorities and need for safety, personal appreciation of risk, physical work environment, and lastly top management's commitment and priority. Safety Climate Assessment Toolkit and Zohar Safety Climate Questionnaires were used in this study. A cross-sectional sample of 309 workers participated. Lowest total mean score was for a personal appreciation of risk (M = 5.41, SD = 1.03), supportive environment (M = 6.61, SD = 0.82), and physical work environment (M = 6.74, SD = 1.24). There was a significant difference between production and nonproduction workers for their perceptions toward involvement in safety (Z = 15.579, P < .001). From the correlation test, age, gender, education level, shift work, and the group were significantly correlated with the nine dimensions of safety climate. Lastly, workers' perception of how management prioritized safety is generally good. A total mean score is (4.89) from the 16 items of Zohar safety climate questionnaire which covers declarative, proactive, and active practices of their management. 相似文献
9.
10.
文章介绍了工业闭路电视监控系统在永福火力发电厂的应用,重点介绍了该系统的组成及功能特点等,并提出了一些优化设计的建议. 相似文献