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The purpose of this paper is to design the geometrical structure of banana screen, and this study aims to improve the screen efficiency.
Abstract
Purpose
The purpose of this paper is to design the geometrical structure of banana screen, and this study aims to improve the screen efficiency.
Design/methodology/approach
The discrete element method was used to simulate the sieving process of banana screen with the inclinations of decks improved by Fibonacci sequence. The effect of each deck along screen length on the screening efficiency of particles was studied in this paper.
Findings
The comparisons among three groups of industrial banana screens with five different consecutive Fibonacci numbers have been made, and the variations of fine particle ratio were also investigated. The results show that the banana screening improved by the 5 Fibonacci sequence, 3, 5, 8, 13 and 21, has the good screening performance in the simulation. It is found that the inclination degree of the first deck at the feed end is the key factor to determine screening efficiency of banana screens.
Practical implications
It is not possible to consider all real physical factors exactly in a virtual model. The experiment prototype of banana screen was used to simply verify the feasibility of the methodology.
Originality/value
This work is helpful for designing the geometric parameters of the curved screen and gives a broad perspective to improve the efficiency of banana screens.
Details
Keywords
Yahya M. Tashtoush, Mohammad A. Alsmirat and Tasneem Alghadi
The purpose of this paper is to propose, a new multi-path routing protocol that distributes packets over the available paths between a sender and a receiver in a multi-hop ad…
Abstract
Purpose
The purpose of this paper is to propose, a new multi-path routing protocol that distributes packets over the available paths between a sender and a receiver in a multi-hop ad hoc network. We call this protocol Geometric Sequence Based Multipath Routing Protocol (GMRP).
Design/methodology/approach
GMRP distributes packets according to the geometric sequence. GMRP is evaluated using GloMoSim simulator. The authors use packet delivery ratio and end-to-end delay as the comparison performance metrics. They also vary many network configuration parameters such as number of nodes, transmission rate, mobility speed and network area.
Findings
The simulation results show that GMRP reduces the average end-to-end delay by up to 49 per cent and increases the delivery ratio by up to 8 per cent.
Originality/value
This study is the first to propose to use of geometric sequence in the multipath routing approach.
Details
Keywords
Wenmin Chu, Xiang Huang and Shuanggao Li
Posture adjustment plays an important role in spacecraft manufacturing. The traditional posture adjustment method, which has a large workload and is difficult to guarantee the…
Abstract
Purpose
Posture adjustment plays an important role in spacecraft manufacturing. The traditional posture adjustment method, which has a large workload and is difficult to guarantee the quality of posture adjustment, cannot meet the requirements of modern spacecraft manufacturing. This paper aims to optimize the trajectory of posture adjustment, reduce the internal force of the posture adjustment mechanism and improve the accuracy of the system.
Design/methodology/approach
First, the measuring point is measured by a laser tracker and the position and posture of the cabin is solved. Then, Newton–Euler method is used to construct the dynamic model of the posture adjustment system (PAS) without internal force. Finally, the adjustment time is optimized based on Fibonacci search method and the trajectory of the cabin is fitted by the fifth order polynomial.
Findings
The simulation results show that, compared with the other trajectory planning methods, this method can effectively avoid the internal force of posture adjustment caused by redundant driving, and the trajectory of velocity and acceleration obtained are continuous, meeting the engineering constraints.
Originality/value
In this paper, a dynamic model of PAS without internal force is constructed. The trajectory planning of posture adjustment based on this model can improve the quality of cabin assembly.
Details
Keywords
Xuyun Zhu, Yun Luo, Yanlin Huang and Xuming Wen
Curves with various profiles have been demonstrated to be more attractive and decorative than the straight lines by William Hogarth. Among all kinds of curves, Hogarth proposed…
Abstract
Purpose
Curves with various profiles have been demonstrated to be more attractive and decorative than the straight lines by William Hogarth. Among all kinds of curves, Hogarth proposed seven serpentine lines as the most beautiful curves, i.e., Hogarth curves. Those seven Hogarth curves are subsequently applied in a wide range of fields, e.g., sculpture, painting, architecture and fashion design, indicating their significance to the development of the formal beauty. Recently, the beauty of Hogarth curves has been suspected to be induced by their special-designed curvature, which could have the potential relationship with the Golden Ratio. The purpose of this paper is to explore the relationship between the Hogarth curves and golden ratio by comparing the curvature of curves with the Fibonacci sequence.
Design/methodology/approach
Each of the Hogarth curves was fully restored and divided into two parts according to the turning point of the curvature; the ratios of span, curvature and angles between these two parts were compared with the Fibonacci sequence.
Findings
The experimental results disclosed that the ratio of the fourth Hogarth curve, which was considered as the most beautiful line by Hogarth, was infinitely approaching the golden ratio. Based on the relationship between the fourth Hogarth curve and the golden ratio, the ratios of each curve were employed to define and normalize these curves, providing a quantitative way to redraw the Hogarth curves.
Originality/value
This research work unlocked the information of the relationship between the Hogarth curves and golden ratio, and proposed an effective and convenient mathematic way to quantify the Hogarth curves. The experimental findings disclosed the underlying mechanisms of the beauty of the forth Hogarth curves. Such a fundamental study will promote the establishment of the normalized methods for evaluating the beauty of arts and provide novel ideas for researchers and industrial technologists to use the Hogarth curves.
Details
Keywords
Thomas Moritz, Klaus‐Dieter Schewe and Bernhard Thalheim
The development of web information systems (WISs) requires modelling on various layers of abstraction. Based on an abstract abstraction layer model (ALM) the work in this article…
Abstract
The development of web information systems (WISs) requires modelling on various layers of abstraction. Based on an abstract abstraction layer model (ALM) the work in this article approaches the modelling on the highest layer dealing with strategic modelling. Strategic modelling addresses a very general characterisation of WISs in terms of its content, functionality, context, usage and presentation, and pragmatic guidelines for achieving these. The article discusses branding, utilisation space modelling, utilisation portfolio modelling and atmosphere modelling as the major parts of a strategic model. Furthermore, techniques based on linguistic analysis, communication analysis and metaphors make up the informal means to approach WISs in strategic terms.
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Arvydas Jadevicius and Simon Huston
– The paper aims to discuss the major and auxiliary types of cycles found in the literature.
Abstract
Purpose
The paper aims to discuss the major and auxiliary types of cycles found in the literature.
Design/methodology/approach
The existence of cycles within economy and its sub-sectors has been studied for a number of years. In the wake of the recent cyclical downturn, interest in cycles has increased. To mitigate future risks, scholars and investors seek new insights for a better understanding of the cyclical phenomenon. The paper presents systematic review of the existing copious cyclical literature. It then discusses general characteristics and the key forces that produce these cycles.
Findings
The study finds four major and eight auxiliary cycles. It suggests that each cycle has its own distinct empirical periodicity and theoretical underpinnings. The longer the cycles are the greater controversy which surrounds them.
Practical implications
Cycles are monumental to a proper understanding of complex property market dynamics. Their existence implies that economies, whilst not deterministic, have a rhythm. Cyclical awareness can therefore advance property market participants.
Originality/value
The paper uncovers four major and eight auxiliary types of cycles and argues their importance.
Details