全文获取类型
收费全文 | 120篇 |
免费 | 10篇 |
专业分类
财政金融 | 13篇 |
工业经济 | 14篇 |
计划管理 | 27篇 |
经济学 | 9篇 |
综合类 | 1篇 |
运输经济 | 4篇 |
旅游经济 | 6篇 |
贸易经济 | 22篇 |
农业经济 | 5篇 |
经济概况 | 1篇 |
水利工程 | 28篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 4篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 10篇 |
2017年 | 10篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 10篇 |
2013年 | 10篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 6篇 |
2009年 | 5篇 |
2008年 | 8篇 |
2007年 | 14篇 |
2006年 | 5篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 1篇 |
2002年 | 2篇 |
1998年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有130条查询结果,搜索用时 171 毫秒
1.
Because biological wastewater treatment plants (WWTPs) involve a long time-delay and various disturbances, in general, skilled operators manually control the plant based on empirical knowledge. And operators usually diagnose the plant using similar cases experienced in the past. For the effective management of the plant, system automation has to be accomplished based upon operating recipes. This paper introduces automatic control and diagnosis based upon the operator's knowledge. Fuzzy logic was employed to design this knowledge-based controller because fuzzy logic can convert the linguistic information to rules. The controller can manage the influent and external carbon in considering the loading rate. The input of the controller is not the loading rate but the dissolved oxygen (DO) lag-time, which has a strong relation to the loading rate. This approach can replace an expensive sensor, which measures the loading rate and ammonia concentration in the reactor, with a cheaper DO sensor. The proposed controller can assure optimal operation and prevent the over-feeding problem. Case-based diagnosis was achieved by the analysis of profile patterns collected from the past. A new test profile was diagnosed by comparing it with template patterns containing normal and abnormal cases. The proposed control and diagnostic system will guarantee the effective and stable operation of WWTPs. 相似文献
2.
To help in clarifying the relationship between the time lag and attenuation of nitrogen (N) loads generated in agricultural catchments, long-term trends in activities that generate N loads and in environmental N loads were estimated in catchments in Japan and Korea dominated by non-point-source emissions. Our approach used statistical data and geographical information system software to analyze pollutant loads. The method was successful in both countries because of the availability of well-developed statistics, geographical information, and weather and water quality monitoring systems, and the accumulation of research data concerning the generation of N loads and the fate of N in soils. Comparison of environmental loads with the loads observed in river water at the outlet of each catchment revealed that: (1) the effect of changes in the environmental load in a catchment appeared almost immediately in the river water quality in Korea, but did not appear clearly even 10 years later in Japan; and (2) the strength of the attenuation appeared to be much lower in Korea than in Japan. These findings suggest that regional characteristics play important roles in the sensitivity of water quality to load-generating activities. 相似文献
3.
We examine the asymptotic behavior of two strategyproof mechanisms discussed by Moulin for public goods – the conservative equal costs rule (CER) and the serial cost sharing rule (SCSR) – and compare their performance to that of the pivotal mechanism (PM) from the Clarke–Groves family. Allowing the individuals’ valuations for an excludable public project to be random variables, we show under very general assumptions that expected welfare loss generated by the CER, as the size of the population increases, becomes arbitrarily large. However, all moments of the SCSR’s random welfare loss asymptotically converge to zero. The PM does better than the SCSR, with its welfare loss converging even more rapidly to zero. 相似文献
4.
ABSTRACTThis study explores the key factors influencing potential employees in the hospitality and tourism industry and examines whether causal relationships between behavioral attitudes, subjective norms, and perceived behavioral control influence students' job selection. The study suggests that the career decision-making process is related to job selection. A total of 307 responses were analyzed. The results explain individual students' attitudes toward a behavior and perceived behavioral control in the context of their job selection. Attitudes toward a behavior and job selection had significant effects on career decisions. On the other hand, opinions of significant others had no significant effect. Perceived behaviors required to decide on jobs had a significant effect on job selection intentions. Students with internship experience were likely to form positive attitudes toward the hospitality and tourism industry, suggesting internships to be a useful source of a stronger relationship between the industry and job aptitudes of students in hospitality and tourism programs. The results have important implications. 相似文献
5.
Zolotoy Leon O’Sullivan Don Seo Myeong-Gu Veeraraghavan Madhu 《Journal of Business Ethics》2021,171(1):189-208
Journal of Business Ethics - This study examines the influence of mood (‘affect’) on corporate philanthropic giving. Drawing on group emotions theory and affect-infused decision theory,... 相似文献
6.
7.
针对中国研究文献中认为中国具有某种本体或历史基体的惯常假设,同时包括中文和英文文献,但尤其重视日本文献,作者对中国历史基体的论述进行了分析,并将沟口雄三具体提出的中国历史基体的主张作为反省的对象,旨在分析他提出历史基体论的动机,即要摆脱因为日本自身历史脉络对日本学者认识中国所造成的限制。作者以韩国学者研究朝贡关系为案例,对历史基体论这一学术议题提出了质疑,并佐以越南的两位中国学专家的观点进行了比较,认为对基体论进行检视有助于中国研究取得知识启示。 相似文献
8.
Research Summary: We study the use of corporate philanthropy as a form of reputation insurance, developing a formal model of such insurance to examine how the terms of insurance in equilibrium change under different assumptions about the firm and its stakeholders. We then test the predictions from this model in the U.S. petroleum industry and find that philanthropic donations offer insurance‐like benefits, but are also positively associated with subsequent oil spills—firms that give more, spill more—with this association being stronger for spills that are under firms’ control and in states with low civic capacity. These results are consistent with an adverse selection/moral hazard equilibrium and suggest that the use of philanthropy as reputation insurance may benefit firms at the cost of society. Managerial Summary: Firms that donate to social causes develop a reputation for being socially responsible, and are often given the benefit of doubt when negative information about them comes to light. But are philanthropic firms truly more responsible? We argue that firms that donate more may be more likely to do harm—those that expect to do harm later are likely to give more now, and those that know their reputation protects them may become less careful. Evidence from the U.S. petroleum industry is consistent with this argument, with firms that give more having more subsequent oil spills, but only the type of spills that are under the firm's control, and only in states where the firm faces weaker scrutiny. 相似文献
9.
Sunhee Seo WooMi Jo Phillips Junghee Jang Kawon Kim 《International Journal of Hospitality Management》2012
This study attempts to identify dining-out patterns among foreign residents in South Korea, examining the differences in foreign residents’ attitudes toward Korean foods and behavioral intentions to patronize Korean restaurants based on their acculturation and uncertainty avoidance levels. The results show that foreign residents in South Korea dine out frequently and intend to revisit Korean restaurants. However, the high acculturation group has a more positive attitude toward, better understanding of, and more preference for Korean foods than the low acculturation group. Satisfaction, revisiting, and recommendation intentions for Korean restaurants are higher among the high acculturation group than the low. The low uncertainty avoidance group spends more money for dining out than the high uncertainty avoidance group, who perceive Korean foods as expensive. Attitudes toward, understanding of, and preference for Korean foods, do not differ significantly between the two uncertainty avoidance groups; nor do satisfaction and behavioral intentions to Korean restaurants. 相似文献
10.
Service recovery through inter-customer helping is especially meaningful in the self-service technology (SST) failure context because SSTs are associated with a high risk of failure due to the lack of face-to-face contacts with employees. In understanding the phenomenon of inter-customer helping, two fundamental questions are investigated in the current research: (1) does social influence play a role in customers’ helping decisions? and (2) what are the motives for helping? Through two experimental studies, we provide evidence that two different forms of social influence play a role in helping others during SST failures, and customers have self-centered (vs. other-centered) motives. Results from Study 1 showed that individuals in the private environment indicated more willingness to help than individuals in the public environment did due to heightened perceived responsibility. Study 2 revealed that tie strength influenced willingness to help via a dual pathway: perceived responsibility and social approach motives. Finally, we discuss and highlight the positive influence that self-centered motives can exert in the SST failure scene. 相似文献