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The purpose of this paper is to evaluate the reliability and signature reliability of solar panel k-out-of-n-multiplex system with the help of universal generating function.

Energy scarcity and global warming issues have become important concerns for humanity in recent decades. To solve these problems, various nations work for renewable energy sources (RESs), including sun, breeze, geothermal, wave, radioactive and biofuels. Solar energy is absorbed by solar panels, referred to as photovoltaic panels, which then transform it into electricity that can be used to power buildings or residences. Remote places can be supplied with electricity using these panels. Solar energy is often generated using a solar panel that is connected to an inverter for power supply. As a result, a converter reliability evaluation is frequently required. This paper presents a study on the reliability analysis of k-out-of-n systems with heterogeneous components. In this research, the universal generating function methodology is used to identify the reliability function and signature reliability of the solar array components. This method is commonly used to assess the tail signature and Barlow-Proschan index with independent and identically distributed components.

The Barlow-Proschan index, tail signature, signature, expected lifetime, expected cost and minimal signature of independent identically distributed are all computed.

This is the first study of solar panel k-out-of-n-multiplex systems to examine the signature reliability with the help of universal generating function techniques with various measures.

The purpose of this paper is to compute the signature reliability of the coherent systems.

The considered k-out-of-n coherent system consists of n number of elements connected in series. With the help of these systems, the authors have evaluated a mathematical structure using universal generating function.

Using the universal generating function technique, the authors evaluate tail signature, Barlow-Proschan index, expected lifetime and expected cost.

In this paper, the authors have developed a coherent systems based on the universal generating function technique.

The purpose of this paper is to deal with a linear multi-state sliding window coherent system which generalizes the consecutive k-out-of-r-from-n:F system in the multi-state case. The system has n linearly ordered multi-state elements consisting of m parallel independent and identically distributed elements. Every element of the system can have two states: completely working or totally failed. The system fails if the sum of performance rate is lower than the given weight.

The authors proposed to compute the signature, MTTF and Barlow–Proschan index with the help of UGF technique of multi-state SWS which consists of m parallel i.i.d. components in each multi-state window.

In the present study, the authors have evaluated the signature reliability, expected lifetime, cost analysis and Barlow–Proschan index.

In this study, the authors have studied a linear multi-state sliding window system which consists of n ordered multi-state element, and each multi-state element also consists of m parallel windows. The focus of the present paper is to evaluate reliability metrices of the considered system with the help of signature from using the universal generating function.

The purpose of this paper is to evaluate various reliability measures like reliability, expected lifetime (mean time to failure), signature reliability and compare networks based on the different flows.

The reliability characteristics of complex bridge networks have been evaluated using different algorithms with the help of universal generating function (UGF). Further, the signature reliability of the considered networks has been determined using Owen’s method.

The present paper proposes an efficient algorithm to compute the reliability indices of complex bridge networks having i.i.d. lifetime components (nodes, edges) with the help of UGF and Owen’s method. This study reveals that a slight change in the complex bridge network affects the reliability significantly. Finally, by the reliability structure function, proposed algorithms are used to find the signature and MTTF. From signature, we have determined the different failure probabilities corresponding to edges of the network.

In this work, we have evaluated reliability characteristics and signature reliability of the complex bridge networks using UGF method and Owen’s method respectively unlike done in the past.

The purpose of this paper is to evaluate the reliability and structure function of refrigeration complex system consisted of four components in complex manner.

Although, a variety of methodologies have been used to assess the refrigeration system's reliability function that has proven to be effective, the universal generating function approach is the basis of this research study, which is used in the calculation of a domestic refrigeration system with four separate components that are related in series and parallel with a corresponding sample to form a complex machine.

In this paper, signature reliability of the refrigeration system has been evaluated with the universal generating function technique. There are four components present in the proposed system in complex (series and parallel) manner. The tail signature, signature, Barlow–Proschan index, expected lifetime and expected cost of independent identically distributed are all computed.

This is the first study of domestic refrigeration system to examine the signature reliability with the help of universal generating function techniques with various measures. Refrigeration systems are an essential process in industries and home applications as they perform cooling or the maintain temperature at the desired value. A cycle of refrigeration consists of four main components such as, heat exchange, compression and expansion with a refrigerant flowing through the units within the cycle.

The purpose of this paper is to design a ring network topology system and alter it into a series–parallel type framework. Then, reliability of the framework is analysed and authors also discussed the signature to analyse the most sensitive component.

This study presents a ring-shaped network system where this type of topology forms a single continuous pathway for signals through every node. In this study, a system consists of ring network topology is generalized in the series–parallel mixed configuration and reliability characteristics are evaluated with the assistance of universal generating function (UGF) technique. The system consists of wires, repeaters, components or computers and power supply. The wires and repeaters are in series, so, if they fail the whole system will fail and the signals will not go further. The components or computers are connected to each other in parallel configuration. So, the whole system will not fail until the last computer is working. There is also a two-unit power supply system which has one unit in a standby mode. On the failure of first power supply, the second one will start functioning and the whole system fails on the failure of both power supply.

By the assistance of UGF technique, reliability function of the framework is evaluated. Also, Barlow–Proschan index and expected lifetime for the designed system is estimated by considering a numerical example for the general ring-shaped network system.

UGF technique is very effective for estimating the reliability of a system with complex structure and having two performance rates, i.e. completely failed and perfectly working, or more than two, i.e. multi-state performance. This technique enables to estimate every components contribution in the working and failure of the whole system. A general model of ring-shaped network system is taken and generalized algorithm is drawn for the system. Then a particular numerical example is solved for illustrating the use of this technique.

Airplanes themselves seem to start up, take off, fly and land in much the same sort of way whether the people around are speaking English, American (—a totally different language—), French, German, Dutch, or what have you. But the Law in each of those countries and many others around the world can take a peculiarly different view of the same set of circumstances. If the maintenance is OK, and the thing goes up and comes down, the Law is unlikely to be too troubled by how it did it. The probability is that if maintenance done in one country causes an accident or contributes to an accident in another country, someone is going to have to put a thinking‐cap on and start looking into the whys and wherefores. For example, if you order your transportation in Spain and call for ‘burro’, you will get a donkey. Whereas if you order your transportation in Italy and call for ‘burro’, you will get butter—perhaps they will expect you to slide on it.

This study aims to examine the association between audit report lag (ARL), the length of time between the fiscal year end and the date the auditors’ report is signed, and client industry homogeneity, a measure of the similarity of operations of members of an industry.

Regression models are used to test the significance of industry homogeneity on the ARL, of specialists in homogenous industries on the ARL, and the completion of the audits of homogenous industry clients in the year of tightening Securities and Exchange Commission (SEC) filing deadlines.

The evidence suggests that auditors complete audits of clients more quickly in more homogenous industries. The association between ARL and homogeneity is negative, which indicates that auditors are more efficient in audits in homogenous industries. The association between ARL and specialist audits in homogenous industries is also negative. Finally, homogenous industry audits are better able to be completed by the compressed filing dates imposed by the SEC on accelerated and large accelerated filers in 2003 and 2006.

This study extends recent research on industry homogeneity’s influence on the audit market. By reporting an association between the homogeneity of a company’s industry and the ARL, investors and regulators have additional information to better evaluate the timing and monitor trends in the timing of the audit report dates.

This article is based upon a paper presented by Major Oliver Stewart to a meeting of The Historical Group of the Royal Aeronautical Society on March 19, 1962, just a few days after the last issue of Major Stewart's own monthly aeronautical journal ‘Aeronautics’ was published. Although some fifteen months have now elapsed since the original paper was presented, it has continuing relevance at this time as the British aeronautical press undergoes further changes. To mention but three examples, the journal ‘Airport and Airline Management’ ceased publication with its May I June 1962 issue, the English language edition of the French ‘Aviation and Space Magazine’ ceased publication with its April 1963 issue, and ‘Aircraft Production’ became a general production engineering journal as from the April 1963 issue. There can be few people better qualified to describe the changing scene of aeronautical journalism, for apart from his experience as a ferry pilot and single‐seat fighter pilot during the First World War and subsequently as an experimental and test pilot at Orfordness and Marilesham Heath, Major Stewart has been aeronautical correspondent of ‘The Morning Post’ (1926–37), ‘The Times’ (1939), ‘The Evening Standard’ (1940) and ‘The Manchester Guardian’ (1941–58). In addition, he was, of course, Editor of ‘Aeronautics’ from the time of its birth in 1939 until its demise last year.

SONIC boom is the name which has been given to the sound heard on the ground immediately following the passage of an aircraft overhead at supersonic speeds. This sound, which has been compared to nearby thunder, results from the passage of the aircraft's shock‐wave field over the observer.