University of Bradford

About: University of Bradford is a education organization based out in Bradford, United Kingdom. It is known for research contribution in the topics: Population & Raman spectroscopy. The organization has 9366 authors who have published 19104 publications receiving 483885 citations. The organization is also known as: The University of Bradford & Bradford University.

Types of gas fluidization

Abstract: The behaviour of solids fluidized by gases falls into four clearly recognizable groups, characterized by density difference (ϱs–ϱf) and mean particle size. The most easily recognizable features of the groups are: powders in group A exhibit dense phase expansion after minimum fluidization and prior to the commenment of bubbling; those in group B bubble at the minimum fluidization velocity; those in group C are difficult to fluidize at all and those in group D can form stable spouted beds. A numerical criterion which distinguishes between groups A and B has been devised and agrees well with published data. Generalizations concerning powders within a group can be made with reasonable confidence but conclusions drawn from observations made on a powder in one group should not in general be used to predict the behaviour of a powder in another group.

A Survey of Monte Carlo Tree Search Methods

Abstract: Monte Carlo tree search (MCTS) is a recently proposed search method that combines the precision of tree search with the generality of random sampling. It has received considerable interest due to its spectacular success in the difficult problem of computer Go, but has also proved beneficial in a range of other domains. This paper is a survey of the literature to date, intended to provide a snapshot of the state of the art after the first five years of MCTS research. We outline the core algorithm's derivation, impart some structure on the many variations and enhancements that have been proposed, and summarize the results from the key game and nongame domains to which MCTS methods have been applied. A number of open research questions indicate that the field is ripe for future work.

Self-motile colloidal particles: from directed propulsion to random walk.

Abstract: The motion of an artificial microscale swimmer that uses a chemical reaction catalyzed on its own surface to achieve autonomous propulsion is fully characterized experimentally. It is shown that at short times it has a substantial component of directed motion, with a velocity that depends on the concentration of fuel molecules. At longer times, the motion reverts to a random walk with a substantially enhanced diffusion coefficient. Our results suggest strategies for designing artificial chemotactic systems.

Wireless sensor networks: A survey on the state of the art and the 802.15.4 and ZigBee standards

Abstract: Wireless sensor networks are an emerging technology for low-cost, unattended monitoring of a wide range of environments. Their importance has been enforced by the recent delivery of the IEEE 802.15.4 standard for the physical and MAC layers and the forthcoming ZigBee standard for the network and application layers. The fast progress of research on energy efficiency, networking, data management and security in wireless sensor networks, and the need to compare with the solutions adopted in the standards motivates the need for a survey on this field.

The impact of culture and governance on corporate social reporting

Abstract: Our aim is to increase understanding of the potential effects of culture and corporate governance on social disclosures. The ethnic background of directors and shareholders is used as a proxy for culture. Corporate governance characteristics include board composition, multiple directorships and type of shareholders. The dependent variable, disclosure in annual reports of Malaysian corporations, is measured by an index score as well as in terms of number of words. Our results indicate a significant relationship between corporate social disclosure and boards dominated by Malay directors, boards dominated by executive directors, chair with multiple directorships and foreign share ownership. Four of the control variables (size, profitability, multiple listing and type of industry) were significantly related to corporate social disclosure with the exception of gearing. This study has public policy implications for Malaysia as well as a number of other countries in the Asia–Pacific region.