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Article
Publication date: 3 May 2016

Changqing Miao, Jie Yu and Mingxing Mei

This paper aims to research steel wire corrosion pitting distribution characteristics and evolution, the shape, number and size of corrosion pits from one tied arch bridge…

Abstract

Purpose

This paper aims to research steel wire corrosion pitting distribution characteristics and evolution, the shape, number and size of corrosion pits from one tied arch bridge were tested, analyzed and researched.

Design/methodology/approach

The probability distribution model of corrosion pits of different shapes was established, and the law of corrosion pit growth and evolution was researched. The relationship between the steel wire local corrosion parameters and the average degree of corrosion was explored.

Findings

The results revealed that the pits of steel wires can be divided into four categories of shapes: a deep ellipsoidal shape, a shallow ellipsoidal shape, a groove shape and a saddle shape. When developing to a certain degree, the small dark narrow type corrosion pit will turn into a large open pit of either a shallow ellipsoidal shape, a groove shape or a saddle shape.

Originality/value

The maximum depth of the corrosion pits was close to the Weibull distribution, and the maximum width and length of the wire corrosion pits were close to the logarithmic normal distribution, causing a large error when using a uniform corrosion model of steel wire mechanics.

Details

Anti-Corrosion Methods and Materials, vol. 63 no. 3
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 April 2004

Robert N Sobol

A pooled income fund (PIF) is one of the methods created under the 1969 Tax Reform Act whereby a taxpayer may make a tax‐deductible remainder gift to a charitable…

Abstract

A pooled income fund (PIF) is one of the methods created under the 1969 Tax Reform Act whereby a taxpayer may make a tax‐deductible remainder gift to a charitable organization. The fund, established by a charitable organization to receive irrevocable gifts from at least two donors, pays current income to the individual beneficiaries for life, but at the termination of each income interest, the allocable principal must revert permanently to the charitable organization. In recent years, a number of PIFs have been offered to the public by charitable organizations through broker‐dealers or related entities. There are numerous securities‐law issues implicated by the sales of these PIFs, including: (i) whether broker‐dealers may solicit donations to such funds and receive compensation for their solicitations; (ii) the effect of the broker‐dealers’ solicitation and receipt of compensation have on securities registration for the PIF or units offered therein under the Securities Act of 1933, the Securities Exchange Act of 1934, or the Investment Company Act of 1940; (iii) whether staff and persons affiliated with the sponsoring charity, including parties assisting them in the marketing of such pooled income funds, also should be permitted to solicit donations; (iv) whether such charities or persons, or parties assisting them in the marketing of such pooled income funds, then should be required to register as broker‐dealers; (v) what securities licenses may be required of the aforementioned parties; and (vi) whether there are ways to design the manner in which third parties other than broker dealers are compensated to resolve any potential issues arising from answers to the previous questions. This article first sets forth the applicable law involved in the analysis and then attempts to answer each of the issues presented above.

Details

Journal of Investment Compliance, vol. 5 no. 2
Type: Research Article
ISSN: 1528-5812

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Article
Publication date: 7 January 2019

Jiandong Wei, Manyu Guan, Qi Cao and Ruibin Wang

The purpose of this paper is to analyze the cable-supported bridges more efficiently by building the finite element model with the spatial combined cable element.

Abstract

Purpose

The purpose of this paper is to analyze the cable-supported bridges more efficiently by building the finite element model with the spatial combined cable element.

Design/methodology/approach

The spatial combined cable element with rigid arms and elastic segments was derived. By using the analytical solution of the elastic catenary to establish the flexibility matrix at the end of the cable segment and adding it to the flexibility matrix at the ends of the two elastic segments, the flexibility matrix at the end of the cable body is obtained. Then the stiffness matrix of the cable body is established and the end force vector of cable body is given. Using the displacement transformation relationship between the two ends of the rigid arm, the stiffness matrix of the combined cable element is derived. By assigning zero to the length of the elastic segment(s) or/and the rigid arm(s), many subdivisions of the combined cable element can be obtained, even the elastic catenary element.

Findings

The examples in this field and specially designed examples proved the correctness of the proposed spatial combined cable element.

Originality/value

The combined cable element proposed in this study can be used for the design and analysis of cable-stayed bridges. Case studies show that it is able to simulate cable accurately and could also be used to simulate the suspenders in arch bridges as well in suspension bridges.

Details

Engineering Computations, vol. 36 no. 1
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 1 August 1962

R.J. Salter

The constant battle to resist the corrosion of the structural steelwork of a bridge commences even before its erection, and must continue relentlessly throughout the life…

Abstract

The constant battle to resist the corrosion of the structural steelwork of a bridge commences even before its erection, and must continue relentlessly throughout the life of the structure. This has been the case with the San Francisco‐Oakland Bay Bridge where the painted surface area of 370 acres extends from a height of 6 ft. above high water to 530 ft. above the water at the top of aircraft warning beacons on the suspension bridge towers.

Details

Anti-Corrosion Methods and Materials, vol. 9 no. 8
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 January 1985

Anti‐corrosive primer. One of the new Five Star Range of resin based products announced by the Boston Chemicals Ltd, Wetherby, West Yorks LS23 7BZ, is an anti‐corrosive…

Abstract

Anti‐corrosive primer. One of the new Five Star Range of resin based products announced by the Boston Chemicals Ltd, Wetherby, West Yorks LS23 7BZ, is an anti‐corrosive primer. This is a water thinnable acrylic, anti‐corrosive primer containing a zinc phosphate. It does not contain any toxic pigments.

Details

Anti-Corrosion Methods and Materials, vol. 32 no. 1
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 13 December 2017

Eduardo José Lima, Marcelo Henrique Souza Bomfim and Miguel Augusto de Miranda Mourão

Several studies have aimed to develop robotic systems which move in transmission lines. Until this moment, all of them have a high weight and cost associated with the…

Abstract

Purpose

Several studies have aimed to develop robotic systems which move in transmission lines. Until this moment, all of them have a high weight and cost associated with the equipment and reduced battery autonomy time. In this context, this paper aims to propose the POLIBOT (POwer Lines Inspection roBOT) with low cost and weight, enabling the movement over the lines and an easier installation and remove.

Design/methodology/approach

The designed robot uses the Profiles Manufacturing Methodology (PMM). The construction of the robot mechanical structure uses modularized aluminum parts built through square profiles. Thus, it’s possible a drastic reduction in production time as well as cost reduction and weight when comparing this method with other manufacturing processes like foundry, for example. For hardware and software systems, the use of free and open source software causes a significant reduction in cost and project execution time. The benefits of using open source systems are immeasurable, both from academic and industrial applications.

Findings

The POLIBOT platform is one solution to the problem of inspection in power lines. With this robot, more lines are maintained with lower time. In its constructive aspect, the robotic mechanism is designed using principles of bioengineering. The use of this principle was successful, considering that obstacle transposition is performed with stability and low energy consumption.

Research limitations/implications

The suggestion for future researches is to replace the battery for solar energy and construction in polymeric material to avoid high magnetic fields.

Practical implications

The commercial application is evident because manual inspections are inefficient, very expensive and dangerous. Thus, it is growing the number of researches that develop mechatronics systems for this kind of inspection.

Social implications

The impact is the reduction of accidents because the present procedure requires precision of movements, where the pilot and electrical technician are close to high electrical and magnetic fields. In addition, for some tasks, the worker has to walk on the line to reach some important points. Thus, those tasks involve high risk of death.

Originality/value

The PMM methodology represents an innovation to the state of the art because others robotic mechanisms proposed for inspection tasks present total structure mass between 50 and 100 kg and POLIBOT has only 9 kg. Other fact is its price for implementation as this robot used the robot operating system (ROS) framework, what dispense the use of licenses. Other important features are that the robot performs the tasks autonomously, which reduces errors introduced by the operator and its low manufacturing cost as compared with other projects.

Details

Industrial Robot: An International Journal, vol. 45 no. 1
Type: Research Article
ISSN: 0143-991X

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Article
Publication date: 20 May 2019

Meredith McQuerry, Cassandra Kwon and Heather Johnson

The purpose of this paper is to identify the challenging barriers faced by female firefighters, which limit workplace entrance and performance.

Abstract

Purpose

The purpose of this paper is to identify the challenging barriers faced by female firefighters, which limit workplace entrance and performance.

Design/methodology/approach

Occupational barriers from both psychological and physiological viewpoints were explored based on previous literature and the reported experiences of female firefighters.

Findings

A comprehensive review of literature synthesizes previous studies pertaining to gender anthropometric differences, female firefighters’ experiences in the work environment and protective clothing issues. The physical capabilities of men and women in specific relation to performing firefighting activities are also examined. Issues of greatest concern are identified for personal protective clothing (PPC) and equipment, which have traditionally been designed for the male human form. This leads to a lack of protection, an increased risk of onsite injury, reduction in mobility and poorer comfort for female firefighters.

Originality/value

This review provides an original overview of the critical workplace challenges faced by female firefighters. The need for female-specific PPC and equipment is specifically addressed to retain the growing number of women entering the male-dominated firefighting profession.

Details

Research Journal of Textile and Apparel, vol. 23 no. 2
Type: Research Article
ISSN: 1560-6074

Keywords

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Article
Publication date: 1 April 1937

In an aircraft having adjustable pitch propellers with pitch control shafts projecting therefrom, means for simultaneously rotating said shafts either similarly or…

Abstract

In an aircraft having adjustable pitch propellers with pitch control shafts projecting therefrom, means for simultaneously rotating said shafts either similarly or oppositely as desired comprising : a wheel carried by each of said shafts ; a tiltable pulley head ; a pair of end pulleys at each extremity of said head ; a pair of middle pulleys at the axis of said head ; an endless flexible medium trained about said wheels and about all of said pulleys so that when said head is tilted in one direction, it will rotate said control shafts oppositely, and when said middle pulleys alone arc rotated they will rotate said control shafts similarly ; and means for rotating said middle pulleys.

Details

Aircraft Engineering and Aerospace Technology, vol. 9 no. 4
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 October 1999

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Details

Anti-Corrosion Methods and Materials, vol. 46 no. 5
Type: Research Article
ISSN: 0003-5599

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Book part
Publication date: 30 May 2017

John Baldwin, Phillip Chidester and Laura Robinson

This research makes a fresh contribution by exploring an understudied aspect of the Tropicália movement: visual performance. After offering a historical overview, we…

Abstract

This research makes a fresh contribution by exploring an understudied aspect of the Tropicália movement: visual performance. After offering a historical overview, we examine the movement’s communicative legacy. We contend that, in addition to song’s lyrics and musical symbols, it is vital to consider a third dimension: visual performance.

The addition of the visual allows for a more fundamental understanding of the many complex meanings that the Tropicalistas constructed in their resistance to political oppression, as well as broader cultural mores and expectations.

Our examination of archival performance videos reveals that Tropicalistas employed modes of dress and a specific, intentional orientation toward their listeners as particularly powerful tools of expression. Revealing these two dimensions of Tropicália performance allows us to better understand the importance of performance as a key element of resistance. The Tropicália movement’s performative reconfigurations of self and other became a vital channel through which the Tropicalistas manage to speak truth to power to challenge the oppressive military regime and question assumptions about Brazilian national identity.

Exploring the role of performance as part of the overall meaning of musical expression opens up new vistas of understanding. While relevant to Tropicália as a pivotal and wholly Brazilian artistic movement, the contributions of this study have implications beyond this particular setting. The analytical approach reveals how artistic movements can serve as both the substance and the expression of national being.

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