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The purpose of this paper is to present a sensitivity analysis of fault-tolerant redundant repairable computing systems with imperfect coverage, reboot and recovery process.

In this investigation, the authors consider the computing system having a finite number of identical working units functioning simultaneously with the provision of standby units. Working and standby units are prone to random failure in nature and are administered by unreliable software, which is also likely to unpredictable failure. The redundant repairable computing system is modeled as a Markovian machine interference problem with exponentially distributed failure rates and service rates. To excerpt the failed unit from the computing system, the system either opts randomized reboot process or leads to recovery delay.

Transient-state probabilities have been determined with which the authors develop various reliability measures, namely reliability/availability, mean time to failure, failure frequency, and so on, and queueing characteristics, namely expected number of failed units, the throughput of the system and so on, for the predictive purpose. To spectacle the practicability of the developed model, a numerical simulation, sensitivity analysis and so on for different parameters have also been done, and the results are summarized in the tables and graphs. The transient results are helpful to analyze the developing model of the system before having the stability of the system. The derived measures give direct insights into parametric decision-making.

The conclusion has been drawn, and future scope is remarked. The present research study would help system analyst and system designer to make a better choice/decision in order to have the economical design and strategy based on the desired mean time to failure, reliability/availability of the systems and other queueing characteristics.

Different from previous investigations, this studied model provides a more accurate assessment of the computing system compared to uncertain environments based on sensitivity analysis.

The purpose of this paper is to study the performance metrics of redundant repairable machining system which is applicable in various systems like computer and communication system, manufacturing and production system, etc.

In the present investigation, the authors develop Markov model for the system consisting of identical active operating machines which are prone to breakdown. The operating machines are under the care of one permanent repair facility that provides time-sharing basis repair services. The maintenance is facilitated with the provision of standby machines of mixed type and permanent as well as additional repair facility. From the economic point of view, F-policy and N-policy to control the service and arrival of failed machines effectively are included.

For the performance analysis of the system in long run, the authors compute steady-state probabilities using product-type solution method recursively. Sensitivity analysis is performed numerically for various parameters by developing code in MATLAB.

The performance prediction done may be helpful for the system designers and decision makers for the improvement of the existing machining systems in various industries.

Markovian model for the performance prediction of fault tolerant multi-identical operating and standby machines redundant system is developed in generic frameworks by incorporating many noble features which were not all taken together by other researchers working on the same lines. The key concepts incorporated for the modeling of the concerned system is: F-policy, N-policy, time-sharing, and sensitivity analysis of availability and cost function.

The role of social networks is central to the phenomenon of employment and ownership in ethnic businesses, ethnic enclaves, and more generally ethnic economies. Social capital within migrant or co-ethnic social networks is generally viewed as an aid to niche employment, in other words as processes of network inclusion. This article examines both processes of inclusion and exclusion in the social networks of Asian Indian migrants in and outside of ethnic economies. Evidence from the life histories of these migrants in New York and London allows us to see the role of social networks in producing cooperation and conflict within modes of economic inclusion and exclusion.

International advertisers up to now continue to be confronted with the question of whether to standardize or adapt their commercial messages. This debate over the standardization versus adaptation issue has involved both advertising practitioners and academicians interested in transnational advertising issues for at least the past four decades. There are three schools of thought regarding international advertising: standardization, adaptation, and the contingency perspective. Aims to review and contrast the perspectives of practitioners (ad agencies as well as clients) and academicians to this problem over the past 40 years. Observes interesting differences over this time frame, both within each of the two groups and between them. Finds practitioners to have alternated between the adaptation and standardization approaches over the four decades with a trend towards standardization, while academicians have mostly advocated the adaptation approach over the 40 years examined.

The purpose of this paper is to prepare calcium oxide (CaO) nanoparticles by green synthesis technique and study its structural, morphological and optical properties. The prepared samples were calcined at, 200°C, 300°C and 500°C, and the variation in the properties at different temperatures were investigated.

Green approach has been used in the present work to synthesise the CaO nanoparticles using Murraya Koenigii leaf (curry leaves) extract as a capping agent. This technique involves the use of nontoxic reagents and natural products derived from various parts of plants.

Studies reveal that CaO nanoparticles with good optical properties can be synthesized successfully by green approach. The optical absorbance spectra show a broad absorption peak around 400–500 nm. FTIR studies confirm the presence of different functional groups that help in the stabilization of CaO nanoparticles. PL emission spectra show a high intensity emission peak at around 231 nm in addition to peaks at 375 nm and 400 nm. XRD studies show planes of CaO cubic phase. SEM images show a nonuniform distribution of spherical particles along with some clusters. EDX spectra confirm the presence of calcium and oxygen.

CaO nanoparticles have wide applications in optical devices as well as in phototherapy. It is thus interesting to devise new and eco-friendly techniques to synthesise these nanoparticles to suit these applications.

This work would provide a new insight into the preparation of different metal oxide nanoparticles by a very simple and cost-effective green technique without the use of toxic reagents.

Purpose – This work offers an investigation of the planning and implementation of climate-adaptation and vulnerability-reduction strategies in coastal mega-cities of the Global South, utilizing Kolkata, India, as a case study. This research is designed to identify factors that aid the implementation of climate-centered action in resource-constrained environments of developing countries and provide a set of policy guidelines reflecting best practices.

Methodology/approach – This work draws principally upon analysis of semistructured field interviews conducted in Kolkata, India, during December 2010 and January 2011. The findings are informed by additional data sources as well, including field observations, informal dialogues and meetings, and a review of secondary literature.

Findings – This work identifies several key success factors, including organizational restructuring, resource redistribution, technological innovation, use of external consultants, coupling of climate and development projects, and integration of climate approaches into infrastructure projects.

Research limitations – This research draws upon Kolkata as a case study; thus the work's broader applicability and utility depend on the similarities between the situation in Kolkata and that of other urban areas. As a local study, this work may also offer fewer insights for regional and national policy.

Originality and value – This work fills a timely, unmet need for a greater understanding of climate-adaptation action in the context of cities of the developing world. The extensive use of personal interviews provides unique insights into the minds of planning officials and professionals and draws upon their practical experience to draw lessons for a wide range of similar environments.

Purpose: The COVID-19 pandemic is the most severe threat we have faced since World War II. So far, there have been about 5 million recorded cases, with over 300,000 fatalities globally. The epidemic is also wreaking havoc on the corporate world. People are losing their jobs and money, and no one knows when normalcy will return. So, addressing the VUCA Leadership Strategies Model is important to get more insight into this topic.

Need for the Study: According to the International Labor Organization, the pandemic might cost 195 million jobs. Even when the immediate impacts wear off, the long-term economic impact will reverberate for years. All four volatile, unpredictable, complex, and ambiguous (VUCA) characteristics apply to the issues we confront due to the coronavirus.

Methodology: Changes caused by COVID-19 occur daily, and are unpredictable, dramatic, and quick. No one can predict precisely when the epidemic will end or when a treatment or immunisation will be available. The pandemic impacts many parts of society, including health care, business, the economy, and social life. There is no ‘best practice’ that enterprises may utilise to tackle the pandemic’s issues. The VUCA leadership strategy models will be discussed and compared in this research study.

Findings: In this moment of transition, leaders must adhere to their fundamental values, core purpose, and ambition for big, hairy, and audacious goals.

Practical Implications: In this chapter, VUCA leadership strategy models will be discussed in detail for pre- and post-pandemic scenarios and their impact on different sectors, which will be very important for researchers in the same field.

COCO TANG India is an innovation-driven company. It takes inspiration from the humble coconut water that all of us are very familiar with and have drunk right from our childhood. The founders of the company, Dr Neelima, a dentist by profession and her husband Chaitanya who is a pharmacist have hit upon the idea of a coconut-based drink quite by accident.

When Dr Neelima was pregnant with her first child, the doctor advised her to take fresh coconut water. It was then that Dr Neelima discovered that fresh coconut water was a paradox, the water from a tender coconut is supposed to be fresh but in many cases is not as fresh as it should be. Coconuts are harvested from remote farms in Andhra Pradesh and sent to Hyderabad. And to top it all, the nutrition value of the coconut past its ideal window of consumption leaves a lot to desire. The price factor too is a dampener. It costs Rs. 25 to have tender coconut water in a metropolis like Hyderabad.

Dr Neelima and her husband developed the product idea from their search for a nutritious, healthy drink. Fresh, tender coconut pulp-based shakes, packed with nutrition, taste, health and at the same time make an aspirational product for the young, bubbly and restless youth of India.

This case deals with the problems, the trials and tribulations that these young first-time entrepreneurs faced and details the marketing efforts the young company is putting into survive in the dog eat dog world of fruit drink industry.

The case details the specific marketing-related problems the company faces and examines what the promoters are doing to overcome these problems, specifically related to the four Ps, that is, product, price, place and promotion. It looks in depth at the innovative marketing practices that COCO TANG India is deploying, including the use of the social media that enabled the COCO TANG India’s founder to win Junior Chamber International – Business Excellence Award for the year 2017–2018.

COCO TANG India is also the recipient of the Telugu book of records ‘certificate of national record’ as being the first brand to introduce Tender Coconut-based Mocktails and Milkshakes (A1).

The purpose of this paper is to focus on the influence of multiple slips on MHD Williamson nanofluid flow embedded in porous medium towards a linearly stretching sheet that has been investigated numerically. The whole analysis has been carried out considering the presence of nth-order chemical reaction between base fluid and nanoparticles.

A similarity transformation technique has been adopted to convert non-linear governing partial differential equations into ordinary ones and then they are solved by using both the RK-4 method and Laplace transform homotopy perturbation method. The consequences of multiple slip parameters on dimensionless velocity, temperature and concentration and heat and mass transfer rates have been demonstrated using tabular and graphical outline.

The investigation explores that the Nusselt number reduces for escalating behaviour of velocity slip and thermal slip parameter. Fluid’s temperature rises in the presence of generative reaction parameter.

A fine conformity of the current results has been achieved after comparing with previous literature studies. Considering destructive chemical reaction, reduced Nusselt number is found to decrease, but reverse consequence has been noticed in the case of generative chemical reaction. Mass transport diminishes when the order of chemical reaction amplifies for both destructive and generative reactions.