Optimization of a periodic inspection strategy to reduce the impact caused by continued degradation on the environment

2021 ◽  
Author(s):  
Bella Yasmina ◽  
Mostefai Mohammed
Keyword(s):  
Periodic Inspection ◽  
Inspection Strategy ◽  
The Impact

scholarly journals Robotic Model for Unmanned Crack and Corrosion Inspection

2019 ◽  
Vol 9 (1) ◽  
pp. 862-867 ◽  
Keyword(s):  
Structural Integrity ◽  
Oil And Gas ◽  
Processing Technique ◽  
High Rate ◽  
Image Processing Technique ◽  
Destructive Testing ◽  
Periodic Inspection ◽  
The Cost ◽  
The Impact ◽  
Non Destructive

After prolonged usage of materials, the formation of cracks and corrosion initiates due to stress, loading condition, the environment of operation, etc. and this affects the structural integrity of structures. Periodic inspection of structures is usually planned, especially in industries where the impact of failure could be devastating, such as oil and gas pipelines, storage tanks, vessels, and airplanes, etc. which are just a few amongst others. This inspection is often aimed at detecting cracks and corrosion of internal and external components using several forms of non-destructive testing mechanism usually performed by a specialist at a high rate. To reduce the cost of inspection as well as downtime due to inspections and maintenance, deployments of mobile robots with fault tracking and identification purpose are steadily increasing. This paper, therefore, details the implementation of an image processing technique using MATLAB to identify defects of structural elements.

scholarly journals A Sustainable Distribution Design for Multi-Quality Multiple-Cold-Chain Products: An Integrated Inspection Strategies Approach

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6612
Author(s):  
Abdul Salam Khan ◽  
Bashir Salah ◽  
Dominik Zimon ◽  
Muhammad Ikram ◽  
Razaullah Khan ◽  
...  
Keyword(s):  
Distribution System ◽  
Time Window ◽  
Cold Chain ◽  
Quality Differentiation ◽  
Inspection Strategy ◽  
Distant Location ◽  
Objective Model ◽  
The Impact ◽  
Optimal Quality

Cold-chain products are time-sensitive and perishable and pose the risk of failure if they are transported to a distant location. Thus, there is a need to analyze their quality during distribution so that the customers may receive optimal-quality products. To address this issue, this study integrates inspection strategies with the sustainable distribution system of multi-quality multiple-cold-chain products. A bi-objective model of cost and emission is proposed under the constraints of heterogeneous vehicle and time window. Furthermore, this study intends to address the following questions: which inspection strategy helps to ensure the potency of delivered products, and what is the impact of quality differentiation on the value of objective functions? A set of meta-heuristics is used for implementing the model using a rich panel of experiments. The results reveal that the quality conditions of different products impact the solutions of cost and emissions. Moreover, the conformity strategy is more viable, as it results in less cost and ensures that the quantity of delivered products meets the level of demand. Finally, the study provides implications for managers and practitioners to develop a sustainable distribution system to maintain the quality of cold-chain products.

scholarly journals Bayesian Analysis of Competing Risks Models with Masked Causes of Failure and Incomplete Failure Times

2017 ◽  
Author(s):  
Yosra Yousif ◽  
Faiz A. M. Elfaki ◽  
Meftah Hrairi
Keyword(s):  
Bayesian Analysis ◽  
Failure Time ◽  
Real Data ◽  
Data Sets ◽  
Hazard Functions ◽  
Periodic Inspection ◽  
Proposed Model ◽  
Interval Censored ◽  
Gamma Processes ◽  
The Impact

Bayesian analysis for masked data under competing risk frameworks is studied for the purpose of assessing the impact of covariates on the hazard functions when the failure time is exactly observed for some subjects but only known to lie in an interval of time for the remaining subjects. Such data, known as partly interval-censored data, usually result from periodic inspection. Dirichlet and Gamma processes are assumed as priors for masking probabilities and baseline hazards. The Markov Chain Monte Carlo (MCMC) technique is employed for the implementation of the Bayesian approach. The effectiveness of the proposed model is tested through numerical studies, including simulated and real data sets.

The Effects of Stress Redistribution Due to Member Failure on Structural Reliability of Offshore Steel Jackets

2002 ◽  
Author(s):  
A. Nelson ◽  
D. J. Sanderson ◽  
A. Stacey
Keyword(s):  
Structural Reliability ◽  
Structural Integrity ◽  
Stress Redistribution ◽  
Periodic Inspection ◽  
Inspection Interval ◽  
Time Period ◽  
Jacket Structures ◽  
Integrity Assurance ◽  
The Impact ◽  
Inspection Schedule

Current practice in providing structural integrity assurance of North Sea Steel Jacket structures relies upon periodic inspection of the sub-structures, with FMD being the preferred method of inspection. The time period between inspections, when employing FMD is dependent upon the structure’s level of redundancy. However, little, if any, consideration is given to the effect a failed member has on the stress distribution within the structure and the probability of a second member failing. A study has been completed that investigated the impact of stress redistribution following failure of a member. The study has considered the impact this has on fatigue lives of adjacent members/joints, and ultimately the impact on structural reliability. The findings from this study suggest that for the type of structures considered, the justification for a given inspection schedule should take due account of the impact of stress redistribution and the possibility that a structure might experience a second member failure during an inspection interval.

The effect of training of food handlers in hospitals kitchen in Khartoum State, Sudan

2021 ◽  
Vol 3 (1) ◽  
pp. 001-012
Author(s):  
Hilwa Hamid Bajin Salam
Keyword(s):  
Raw Materials ◽  
Food Handlers ◽  
Food Services ◽  
Chi Square ◽  
State Hospitals ◽  
Periodic Inspection ◽  
Paired Samples ◽  
Chi Square Test ◽  
The Impact

An interventional research was conducted in the kitchens of Khartoum state hospitals 2021 on the impact of training of food handlers in (12) hospitals with (56) food handlers to identify food hygiene requirement. Training was done before and interventions training after. Questionnaires were filled out with food handlers and interview with nutrition supervisor about kitchens. The data was statistically analyzed by using the Statistic Package for Social Sciences (SPSS) program version 25; the Paired Samples T Test and Chi-Square Test was used and there is an improvement at the level of indication 0.000 at the level (0.05). The results showed that the majority of food handlers were females (75%), the lack of quality of kitchens in buildings, equipment, utensils, hand facilities, no periodic inspection for raw materials and no any training about food safety and hygiene for all food services staff. The study concluded that training has an effective impact on kitchen quality. The study recommended that the ministry of health and hospitals to design kitchens with standardization and provide training to all workers periodically.

Study on the Dynamic Inspection for Decreasing the Losses and Costs Caused by Accidents of Fixed Equipment in Petrochemical Plants

2012 ◽  
Vol 608-609 ◽  
pp. 1511-1525
Author(s):  
Guang Pei Cong ◽  
Jin Ji Gao ◽  
Bing Hou ◽  
Jing Zhu ◽  
Bao Wei Zhang
Keyword(s):  
Decision Making ◽  
Personal Factors ◽  
Optimal Method ◽  
Inspection Method ◽  
Equipment Safety ◽  
Inspection Strategy ◽  
Soft Measurement ◽  
Stress Energy ◽  
The Cost ◽  
The Impact

The risk- and condition-based dynamic inspection proposed to decrease losses and costs caused by accidents which is not only a decision-making and optimal method for inspection strategies, but is also a soft measurement system for fixed equipment safety status. In the risk- and condition-based dynamic inspection method, data collection is standardized to decrease the impact of personal factors on the data. Moreover, a procedure in which experts approve the data collected from plants is supplemented to amend error and supplement omission of data in time. A relevant inspection strategy is adopted based on the different damage types and its initiation and growth for the aspect of inspection decision-making. In the meantime, the cost-risk efficiency of the inspection is regarded as an objective function to optimize inspection strategies according to the risk status of equipment. Finally, a model is established to assess the frequency of in-service inspection and ensure equipment safety during the end of equipment life based on the fitted linear relationship between the corrosion rate and stress energy.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics

1997 ◽  
Vol 161 ◽  
pp. 197-201 ◽  
Author(s):  
Duncan Steel
Keyword(s):  
Probability Distributions ◽  
Regions Of Interest ◽  
Significant Fraction ◽  
Organic Chemicals ◽  
Impact Speed ◽  
The Mean ◽  
The Impact

AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbital distribution of known asteroids; and (ii) the expected distribution of near-parabolic cometary orbits. It is found that cometary impacts are far more likely to eject rocks from Mars (over 99 percent of the cometary impacts are at speeds above 20 km/sec, but at most 5 percent of the asteroidal impacts); paradoxically, the objects impacting at speeds low enough to make organic/volatile survival possible (the asteroids) are those which are depleted in such species.

Organic Syntheses During the Impact of a Comet with a Gaseous Planet

1997 ◽  
Vol 161 ◽  
pp. 189-195
Author(s):  
Cesare Guaita ◽  
Roberto Crippa ◽  
Federico Manzini
Keyword(s):  
Polymeric Material ◽  
Molecular Form ◽  
Parent Compound ◽  
Blue Filter ◽  
Organic Syntheses ◽  
The Impact

AbstractA large amount of CO has been detected above many SL9/Jupiter impacts. This gas was never detected before the collision. So, in our opinion, CO was released from a parent compound during the collision. We identify this compound as POM (polyoxymethylene), a formaldehyde (HCHO) polymer that, when suddenly heated, reformes monomeric HCHO. At temperatures higher than 1200°K HCHO cannot exist in molecular form and the most probable result of its decomposition is the formation of CO. At lower temperatures, HCHO can react with NH3 and/or HCN to form high UV-absorbing polymeric material. In our opinion, this kind of material has also to be taken in to account to explain the complex evolution of some SL9 impacts that we observed in CCD images taken with a blue filter.

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