The relationships between corruption and pollution on corruption regimes

Previous studies have focused mainly on the effect of corruption on pollution. The results of these studies show an inverted U-shaped relationship between economic growth and pollution. In addition, some researchers have suggested that corruption plays an important role in determining pollution. This study proposes the hypothesis of a nonlinear long-run relationship between pollution and corruption. The goal of the study is to investigate the threshold cointegration effect of pollution on corruption using panel data for 62 countries over the period from 1997 to 2004. The results show that the effect of the Corruption Perceptions Index (CPI) on pollution is insignificant in low-corruption regimes. This implies that corruption does not slow down environmental pollution in countries with low corruption. The impact of the CPI on environmental pollution is also insignificant in high-corruption regimes. This result implies that corruption has no adverse impact on environmental pollution in countries with high corruption.Corruption, Pollution, Threshold, Error-Correction Model

Heterogeneity-aware scheduling and data partitioning for system performance acceleration

Over the past decade, heterogeneous processors and accelerators have become increasingly prevalent in modern computing systems. Compared with previous homogeneous parallel machines, the hardware heterogeneity in modern systems provides new opportunities and challenges for performance acceleration. Classic operating systems optimisation problems such as task scheduling, and application-specific optimisation techniques such as the adaptive data partitioning of parallel algorithms, are both required to work together to address hardware heterogeneity. Significant effort has been invested in this problem, but either focuses on a specific type of heterogeneous systems or algorithm, or a high-level framework without insight into the difference in heterogeneity between different types of system. A general software framework is required, which can not only be adapted to multiple types of systems and workloads, but is also equipped with the techniques to address a variety of hardware heterogeneity. This thesis presents approaches to design general heterogeneity-aware software frameworks for system performance acceleration. It covers a wide variety of systems, including an OS scheduler targeting on-chip asymmetric multi-core processors (AMPs) on mobile devices, a hierarchical many-core supercomputer and multi-FPGA systems for high performance computing (HPC) centers. Considering heterogeneity from on-chip AMPs, such as thread criticality, core sensitivity, and relative fairness, it suggests a collaborative based approach to co-design the task selector and core allocator on OS scheduler. Considering the typical sources of heterogeneity in HPC systems, such as the memory hierarchy, bandwidth limitations and asymmetric physical connection, it proposes an application-specific automatic data partitioning method for a modern supercomputer, and a topological-ranking heuristic based schedule for a multi-FPGA based reconfigurable cluster. Experiments on both a full system simulator (GEM5) and real systems (Sunway Taihulight Supercomputer and Xilinx Multi-FPGA based clusters) demonstrate the significant advantages of the suggested approaches compared against the state-of-the-art on variety of workloads."This work is supported by St Leonards 7th Century Scholarship and Computer Science PhD funding from University of St Andrews; by UK EPSRC grant Discovery: Pattern Discovery and Program Shaping for Manycore Systems (EP/P020631/1)." -- Acknowledgement

The impact of negative events in scenic spots on tourists' behavioral intention: an analysis from the perspective of event system theory

Tourism is an important economic activity in China representing about 11.04% of GDP and 10.29% of total employment. In recent years, negative events occurred frequently in Chinese tourism spots, especially in scenic spots, and tended to be promptly divulgated through social networks. The impact of these fast-running news on tourism activity is still to be appraised. This study reviews the literature on negative events, and e-word-of-mouth effects, jointly with personality characteristic theory, and consumer behavior intentions to address the impact of negative events on tourism. The study contributes to the existent knowledge by using the event theory system framework to explore how negative events affect tourists’ intentions concerning visiting places where negative events took place. The results are meaningful both theoretically and practically, showing that, on the one hand, the dimensions of space and intensity proposed by the event theory system have a significant impact on tourists’ behavior and, on another hand, tourists’ personality, namely risk-taking tendencies and openness, has a significant impact on tourists' willingness to recommend. Further, the study addresses its limitations and proposes management contributions, and future directions of research.O turismo é uma atividade muito importante na China representando cerca de 11.04% do seu PIB e 10.29% do seu emprego total. Recentemente, acontecimentos negativos têm ocorrido com frequência em locais turísticos, especialmente em locais de espetáculos, e têm sido rapidamente difundidos através das redes sociais. O impacto sobre a atividade turística destas notícias aceleradas está ainda por avaliar. Este trabalho revê a literatura sobre acontecimentos negativos e efeitos de difusão eletrónica "boca-a-boca", em conjunto com a teoria da personalidade e das intenções de consumo, para analisar o impacto de acontecimentos negativos no turismo. O estudo contribui para a literatura existente ao usar o quadro do "event theory system" para explorar como os acontecimentos negativos afetam as decisões dos turistas em visitar os locais onde estes ocorreram. Os resultados são significativos, quer do ponto de vista teórico, quer prático, demonstrando, por um lado, que as dimensões espaço e intensidade sugeridas pelo "event theory system" têm impacto significativo no comportamento dos turistas e, por outro, que a personalidade dos turistas, nomeadamente a sua tendência para aceitar o risco e a sua abertura, tem um impacto significativo na sua vontade de recomendar os locais afetados pelos acontecimentos negativos. Adicionalmente, o estudo discute as suas limitações e propõe contribuições para o processo de gestão, bem como linhas de investigação futuras

Zero-Mode Contribution in Nucleon-Delta Transition

We investigate the transition form factors between nucleon and $\Delta$(1232) particles by using a covariant quark-spectator-diquark field theory model in (3+1) dimensions. Performing a light-front calculation in parallel with the manifestly covariant calculation in light-front helicity basis, we examine the light-front zero-mode contribution to the helicity components of light-front good ("+") current matrix elements. Choosing the light-front gauge ($\epsilon^+_{h=\pm}=0$) with circular polarization in Drell-Yan-West frame, we find that only the helicity components $({1\over 2}, {1\over 2})$ and $({1\over 2},-{1\over 2})$ of the good current receive the zero-mode contribution. Taking into account the zero-mode, we find the prescription independence in obtaining the light-front solution of form factors from any three helicity matrix elements with smeared light-front wavefunctions. The angular condition, which guarantees the full covariance of different schemes, is recovered.Comment: 16 latex pages, 7 figures, to appear in PR