Protection of Metal Parts of Aircraft against Corrosion

1932 ◽  
Vol 36 (253) ◽  
pp. 1-23
Author(s):  
H. Sutton
Keyword(s):  
Economic Problem ◽  
Primary Concern ◽  
Corrosion Prevention ◽  
Engineering Structures ◽  
Metal Structures ◽  
Metal Parts ◽  
The Past ◽  
Preventative Measures ◽  
The Cost

During the past few years particular attention has been paid to the protection of metal parts of engineering structures of all kinds against corrosion. The problem of protecting metal structures against deterioration is now recognised as of primary concern both to users and to manufacturers. Corrosion prevention is an economic problem and its cost must be based on the cost of preventative measures compared with the loss directly and indirectly due to deterioration. In those sections of industry in which marked advances have occurred in corrosion prevention, the advances can be seen to be the result of close co-operation between the laboratory, manufacturers and users.

scholarly journals COMPARATIVE ANALYSIS AND SELECTION OF TECHNOLOGY OF DEVICE OF FENCING METAL STRUCTURES IN CONSTRUCTION OF UNDERGROUND STRUCTURES

2021 ◽  
Vol 9 (1) ◽  
pp. 26-30
Author(s):  
Elena Korol ◽  
Zarina Chipova
Keyword(s):  
Underground Structures ◽  
Engineering Structures ◽  
Metal Structures ◽  
Large Cities ◽  
Long Time ◽  
Complex Engineering ◽  
Transport Problems ◽  
The Cost ◽  
Transport Complex ◽  
Selection Of

Urban motor transport complex engineering structures, the construction of which is carried out for a long time, and the cost is often tunnels of structures. Despite this, urban tunnels remain in demand as a means of solving transport problems, especially for large cities, in areas with dense urban development or an established architectural appearance, the violation of which is unacceptable. The construction of tunnels makes it possible to increase the throughput of highways, especially in places of large intersections, one of the diverting high-intensity transit traffic flows underground, making them invisible on the surface and thus not disrupting the existing historical appearance of the area.

Measuring the cost of environmental compliance for Waikato dairy farmers - a survey approach

2015 ◽  
Vol 77 ◽  
pp. 159-166
Author(s):  
T.O.R. Macdonald ◽  
J.S. Rowarth ◽  
F.G. Scrimgeour
Keyword(s):  
Qualitative Data ◽  
Management Practice ◽  
Dairy Farm ◽  
Environmental Compliance ◽  
Dairy Farmers ◽  
The Past ◽  
Farm Systems ◽  
The Cost ◽  
Farm System ◽  
Survey Approach

The link between dairy farm systems and cost of environmental compliance is not always clear. A survey of Waikato dairy farmers was conducted to establish the real (non-modelled) cost of compliance with environmental regulation in the region. Quantitative and qualitative data were gathered to improve understanding of compliance costs and implementation issues for a range of Waikato farm systems. The average oneoff capital cost of compliance determined through a survey approach was $1.02 per kg milksolids, $1490 per hectare and $403 per cow. Costs experienced by Waikato farmers have exceeded average economic farm surplus for the region in the past 5 years. As regulation increases there are efficiencies to be gained through implementing farm infrastructure and farm management practice to best match farm system intensity. Keywords: Dairy, compliance, farm systems, nitrogen, Waikato

Attraction of prey

2018 ◽  
Author(s):  
John D. Horner ◽  
Bartosz J. Płachno ◽  
Ulrike Bauer ◽  
Bruno Di Giusto
Keyword(s):  
Visual Cues ◽  
Synergistic Action ◽  
Carnivorous Plants ◽  
Future Research ◽  
Acoustic Cues ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
The Past ◽  
The Cost ◽  
Prey Attraction

The ability to attract prey has long been considered a universal trait of carnivorous plants. We review studies from the past 25 years that have investigated the mechanisms by which carnivorous plants attract prey to their traps. Potential attractants include nectar, visual, olfactory, and acoustic cues. Each of these has been well documented to be effective in various species, but prey attraction is not ubiquitous among carnivorous plants. Directions for future research, especially in native habitats in the field, include: the qualitative and quantitative analysis of visual cues, volatiles, and nectar; temporal changes in attractants; synergistic action of combinations of attractants; the cost of attractants; and responses to putative attractants in electroantennograms and insect behavioral tests.

scholarly journals Current challenges in modelling vibrational fatigue and fracture of structures: a review

2021 ◽  
Vol 43 (2) ◽  
Author(s):  
Khangamlung Kamei ◽  
Muhammad A. Khan
Keyword(s):  
Fatigue Damage ◽  
Thermal Environment ◽  
Research Work ◽  
Working Life ◽  
Stochastic Response ◽  
Metal Structures ◽  
Life Estimation ◽  
The Past ◽  
New Directions ◽  
Fatigue And Fracture

AbstractFatigue damage is a concern in the engineering applications particularly for metal structures. The design phase of a structure considers factors that can prevent or delay the fatigue and fracture failures and increase its working life. This paper compiled some of the past efforts to share the modelling challenges. It provides an overview on the existing research complexities in the area of fatigue and fracture modelling. This paper reviews the previous research work under five prominent challenges: assessing fatigue damage accurately under the vibration-based loads, complications in fatigue and fracture life estimation, intricacy in fatigue crack propagation, quantification of cracks and stochastic response of structure under thermal environment. In the conclusion, the authors have suggested new directions of work that still require comprehensive research efforts to bridge the existing gap in the current academic domain due to the highlighted challenges.

scholarly journals Multi-stable composite twisting structure for morphing applications

2012 ◽  
Vol 468 (2141) ◽  
pp. 1230-1251 ◽  
Author(s):  
X. Lachenal ◽  
P. M. Weaver ◽  
S. Daynes
Keyword(s):  
Analytical Model ◽  
Material Properties ◽  
Degrees Of Freedom ◽  
Design Parameters ◽  
Engineering Structures ◽  
The Past ◽  
Wide Range ◽  
Morphing Structure ◽  
Low Mass ◽  
Unstable States

Conventional shape-changing engineering structures use discrete parts articulated around a number of linkages. Each part carries the loads, and the articulations provide the degrees of freedom of the system, leading to heavy and complex mechanisms. Consequently, there has been increased interest in morphing structures over the past decade owing to their potential to combine the conflicting requirements of strength, flexibility and low mass. This article presents a novel type of morphing structure capable of large deformations, simply consisting of two pre-stressed flanges joined to introduce two stable configurations. The bistability is analysed through a simple analytical model, predicting the positions of the stable and unstable states for different design parameters and material properties. Good correlation is found between experimental results, finite-element modelling and predictions from the analytical model for one particular example. A wide range of design parameters and material properties is also analytically investigated, yielding a remarkable structure with zero stiffness along the twisting axis.

Are Apprenticeships Still Relevant in the 21st Century? A Case Study of Changing Youth Training Arrangements in German Banks

ILR Review ◽  
2002 ◽  
Vol 55 (4) ◽  
pp. 667-685 ◽  
Author(s):  
David Finegold ◽  
Karin Wagner
Keyword(s):  
21St Century ◽  
Cost Savings ◽  
New Firms ◽  
Workplace Flexibility ◽  
Transferable Skills ◽  
The Past ◽  
Detailed Case ◽  
The Cost ◽  
Youth Training

The authors present a detailed case study of the evolution of apprenticeships in German banking over the past two decades to analyze why employers continue to be willing to invest in these programs that provide workers with transferable skills. They explain employers' motivation in terms of two “logics.” Some considerations stemming from the logic of consequences, such as recruitment cost savings and enhanced workplace flexibility, encourage retention of the apprenticeship system. On balance, however, the cost calculus that is at the heart of the logic of consequences would, if unopposed, encourage head-hunting for apprentices trained by other firms, eventually undermining the system. The countervailing logic of appropriateness, however, discourages defections from the system by fostering trust among employers, encouraging new firms to participate in the system, supporting the strong reputational effect associated with training, and creating mechanisms with which banks can have a hand in keeping the system efficient.

Propeller Cavitation Induced Hull Pressure Reduction by Air-Bubble Layer

2013 ◽  
Author(s):  
Jeung-Hoon Lee ◽  
Hyoung-Gil Park ◽  
Jin-Hak Kim ◽  
Kyung-Jun Lee ◽  
Jong-Soo Seo
Keyword(s):  
Acoustic Scattering ◽  
Destructive Interference ◽  
Primary Concern ◽  
Pressure Amplitude ◽  
Pressure Reduction ◽  
Noise Sources ◽  
Air Bubble ◽  
Excessive Consumption ◽  
Bubble Layer ◽  
The Cost

Cavitation generated by a marine propeller is a primary concern among the possible vibration- and noise- sources in commercial ships. By exploiting the compressibility of air, there have been many attempts to form an air-bubble layer underneath the stern-hull surface above the propeller, and consequently to isolate the cavity-induced pressure wave across the layer. However, it could not be popularly used because the cost was so expensive to deliver a huge amount of air for a sufficient isolation performance. In this work, full-scale ship measurements reveal that a significant reduction of pressure-amplitude is possible at the outside of an air-bubble layer, where the isolation effect is not involved. Moreover a hull-vibration reduction of approximately 75% was found to be achievable. Instead of excessive consumption of air, considerably small amount is necessary for a reduction of cavity-induced pressure amplitude, which can make the constitution of relevant system simple. Hence the purpose of this study is to provide a physical proof for such a beneficial phenomenon. By approximating the solution of acoustic scattering from a bubble, we find that phase-reversal reflection provoking a destructive interference is the main reason for a pressure reduction outside the layer.

Acute Medicine Trainee Update

2011 ◽  
Vol 10 (3) ◽  
pp. 149-149
Author(s):  
Amy Daniel ◽  
◽  
Alice Miller ◽  
Keyword(s):  
Palliative Care ◽  
Medical Ethics ◽  
Advisory Committee ◽  
Skill Training ◽  
Skills Training ◽  
Training Programme ◽  
Acute Medicine ◽  
The Past ◽  
Training Programme Director ◽  
The Cost

We have been aware for a while that there are disparities in specialist skill provision both between and within deaneries – and the SAC is working hard to identify problems in this area. More recently, the issue of funding for specialist skills has been raised. It seems that some deaneries are happy and able to contribute towards the cost of training in a particular skill, while others are not; in at least one deanery, part-funding has now been withdrawn, leaving trainees to cover the entire cost of their chosen skills training. As specialist skill training is now a mandatory part of the Acute Medicine curriculum, we need to find a way to eliminate disparity both between different deaneries and between different skills. However, there is no easy solution, and for the time being, trainees will have to factor in the potential financial implications of a particular skill when they are considering their options. On a brighter note, the list of recognised specialist skills has increased over the past year. Palliative Care has been authorised as a suitable skill, and Medical Ethics and Law will soon also be added to the list. If you would like to propose a skill that is not currently listed in the Acute Medicine curriculum, you should discuss it with your training programme director, who can bring the proposal to the Acute Medicine Specialty Advisory Committee (SAC).

Impact of Major Highways on the Wildlife Population in Kingston and Frontenac County

2018 ◽  
Author(s):  
Paige Robinson ◽  
Gavin Mclaughlin ◽  
Michael O'Meara ◽  
Hilary Ouellette
Keyword(s):  
Noise Pollution ◽  
Ecological Environment ◽  
Extensive Literature ◽  
Primary Concern ◽  
The Past ◽  
Local Organizations ◽  
Local Species ◽  
Local Residents ◽  
Wildlife Populations

Over the past five years, there has been an abundance of interest concerning the ecological effects of major Ontario highways on the habitats and ecosystems of many wildlife populations. The primary concern with multilane, high-traffic freeways is that they typically divide existing habitats into relatively isolated zones. Consequently, this separates individuals within a population from other members of the same population, and also excludes access to many natural resources. The majority of the resultant issues for wildlife fall under three main categories; the collision based mortalities of organisms and the consequences on local residents, the halting of gene flow amongst the wildlife populations, and the physical intrusion and/or noise pollution adversely affecting the quality of habitat for local species. Based on these concerning issues, it is crucial for a sustainable solution to be developed and implemented in appropriate areas within Kingston and the surrounding Frontenac County. Our approach involves an extensive literature review, which will assist us in observing similar problems around the globe, as well as various solutions that have been executed to fix these said problems. Furthermore, we will conduct a thorough investigation of local organizations’ existing studies to obtain relevant data and statistics which will assist us in determining the effects high-traffic freeways have on the surrounding ecological environment. It is through this research that we hope to present valid findings on the multilane highways impact to local ecosystems and landscapes, as well as produce possible planning options for intervention and suggest key areas for further examination.

Estimating the cost of pure cybercrime to Australian individuals

2021 ◽  
Author(s):  
Coen Teunissen ◽  
Isabella Voce
Keyword(s):  
Economic Impact ◽  
The Other ◽  
Population Estimates ◽  
Australian Population ◽  
Probability Sampling ◽  
The Past ◽  
Online Panels ◽  
The Cost

This report estimates the cost of pure cybercrime to individuals in Australia in 2019. A survey was administered to a sample of 11,840 adults drawn from two online panels—one using probability sampling and the other non-probability sampling—with the resulting data weighted to better reflect the distribution of the wider Australian population. Thirty-four percent of respondents had experienced some form of pure cybercrime, with 14 percent being victimised in the last 12 months. This is equivalent to nearly 6.7 million Australian adults having ever been the victim of pure cybercrime, and 2.8 million Australians being victimised in the past year. Drawing on these population estimates, the total economic impact of pure cybercrime in 2019 was approximately $3.5b. This encompasses $1.9b in money directly lost by victims, $597m spent dealing with the consequences of victimisation, and $1.4b spent on prevention costs. Victims recovered $389m.

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