1,723,058 research outputs found
Study on the Law of Surface Cracks While Coal Mining in the Thin Bedrock and Thick Unconsolidated Layer of Yu-Shen-Fu Mining Area
No full textThe law of surface cracks caused by coal mining in ther thin bedrock and thick unconsolidated layer was studied in Yu-Shen-Fu mining area. The crack development in the overlying strata of the coal mining face was detected by drilling survey technology, the whole process of the ground surface crack dynamic evolution was carried out by similar material simulation, and the law of surface cracks evolution was verified by on-site tracking measurement. The study reached the regulation of the overlying strata failure and dynamic evolution of surface cracks caused by coal mining under thin bedrock and thick unconsolidated layer in Yu-Shen-Fu mining area, which can provide theoretical support for the ecological restoration of western mining area
An empirical and comparative analysis of Taiwanese unemployment and wages
No full textTaiwan has long been recognized as an economic entity highly dependent on its international trade. The thesis discusses its labour predicament at both macro and micro levels, in terms of unemployment rate and labour wage determination, in a framework of international trade studies.This thesis start with its attempt to examine if cyclical export gap is in fact beneficial to the local unemployment rate. Within an Autoregressive Distributed Lag(ADL) framework of Okun coefficients, cyclical export gap is added as an extra explanatory variable, to examine if Dutt et al.’s prediction that unemployment and trade openness are negatively related can be statistically supported with Taiwanese data. Furthermore, the Chow test demonstrates that there are “shocks” that would create structural changes, at 1990q1 when Taiwan reinitiates trade with China, and at 2002q1, when Taiwan joined WTO as a member country. Lastly, a Quandt Likelihood Ratio test is included so to locate the date when any additional structural break is most likely to happen.This thesis also analyses the impact of different Taiwanese government policies affecting wages. For the past two decades, an expanding education policy has been implemented regardless of the alternating parties in administration. Also, the Taiwanese government maintained a tolerant policy regarding the expansion of the real-estate market bubble. Using three different estimators, this thesis finds evidence supporting that the wages of the youngest cohort suffer from lower education returns and the crowding-out effect of corporation indebtedness on real property reinforced by the housing bubble. The thesis could not find evidence supporting that the preferential bilateral free trade agreement between Taiwan and China, known as the Economic Cooperation Framework Agreement, is benign to Taiwanese labour wages.The thesis also compares how the same wage determining factors would have similar or different impact on UK wages, so to see: How are the wage determinants(e.g., education attainment, industrial investment in real estate) affecting the UK labour force, in a similar or different ways as opposed to their Taiwanese counterparts? And how do such impacts change at different structural breaks
Grey Correlation Analysis and Regression Estimation of Mining Subsidence in Yu-Shen-Fu Mining Area
No full textAbstractThis paper studied the relationship between the surface max subsidence coefficient and influence factors with grey correlation analysis method, based on coal existent condition and survey data of mining design and the surface rock displacement in the 15 typical coal mining places of Yu-Shen-Fu mining area. The analysis results showed that comprehensive pullman's thickness of overburden strata, disturbance coefficient, mining thickness ratio and etc. are the key influence factors to the mining subsidence. Taking the surface max subsidence coefficient as the strain value and the above key influence factors as independent, a gradual regression analysis method was applied to set up a regressive equation. It is hoped that the paper gives a scientific reference to the prediction of mining subsidence before the mining operation in coal mining area
Prediction and Maintenance of Water Resources Carrying Capacity in Mining Area—A Case Study in the Yu-Shen Mining Area
No full textThe problem of water resources damage caused by coal mining has restricted the sustainable development of Yu-Shen mining area. Illustrating the relationship between mining and water resources carrying capacity is of great significance to solve this problem. In this study, the authors proposed an appraisal and prediction model of water resource carrying capacity in the mining area (WRCCMA) based on the analytic hierarchy process (AHP)-fuzzy comprehensive evaluation method. A triple-leveled structure model was developed, and the main influencing factors of the WRCCMA and the membership functions were analyzed. The prediction model was applied to Yubujie colliery to test its validity by investigating the changes of vegetation coverage and the ground deformation of the colliery and its adjacent coal mine before and after mining. Subsequently, we obtained the WRCCMA of the study area and zoning map of different grades of WRCCMA in the mining area by applying this model to the whole Yu-Shen mining area. Furthermore, three countermeasures to maintain the WRCCMA and realize water conservation coal mining (WCCM) were provided to collieries with different WRCCMA grades, including mining methods selection, mine water reutilization, and water-resisting layer reconstruction. Reasonable mining methods and water-resisting layer reconstruction can reduce the development of water conductive fractures and thus prevent groundwater from penetrating into the goaf. Mine water reutilization provides a source of water demand for collieries and families, contributing to the reduction of abstraction of water resources. These three countermeasures can help to maintain the WRCCMA. This paper successfully combines the fuzzy theory with mining engineering and provides theoretical and practical guidance for other mining areas in arid and semi-arid regions of Northwest China
sj-docx-1-trr-10.1177_03611981221098696 – Supplemental material for Parking Planning With Route Assignment for Planned Special Events
No full textSupplemental material, sj-docx-1-trr-10.1177_03611981221098696 for Parking Planning With Route Assignment for Planned Special Events by Yujing Zheng, Jing Cao, Yu Shen, Bing Liu and Yuxiong Ji in Transportation Research Record</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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