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Wyszukujesz frazę "Singh, Rajesh" wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Estimating population coefficient of variation using a single auxiliary variable in simple random sampling
    Autorzy:
    Singh, Rajesh
    Mishra, Madhulika
    Powiązania:
    https://bibliotekanauki.pl/articles/1186918.pdf
    Data publikacji:
    2019-12-10
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    coefficient of variation
    simple random sampling
    auxiliary variable
    mean square error
    Opis:
    This paper proposes an improved estimation method for the population coefficient of variation, which uses information on a single auxiliary variable. The authors derived the expressions for the mean squared error of the proposed estimators up to the first order of approximation. It was demonstrated that the estimators proposed by the authors are more efficient than the existing ones. The results of the study were validated by both empirical and simulation studies.
    Źródło:
    Statistics in Transition new series; 2019, 20, 4; 89-111
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing calibration estimators for population mean using robust measures of dispersion under stratified random sampling
    Autorzy:
    Audu, Ahmed
    Singh, Rajesh
    Khare, Supriya
    Powiązania:
    https://bibliotekanauki.pl/articles/1054567.pdf
    Data publikacji:
    2021-06-04
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    calibration
    outliers
    percentage relative efficiency (PRE)
    stratified sampling
    Opis:
    In this paper, two modified, design-based calibration ratio-type estimators are presented. The suggested estimators were developed under stratified random sampling using information on an auxiliary variable in the form of robust statistical measures, including Gini’s mean difference, Downton’s method and probability weighted moments. The properties (biases and MSEs) of the proposed estimators are studied up to the terms of firstorder approximation by means of Taylor’s Series approximation. The theoretical results were supported by a simulation study conducted on four bivariate populations and generated using normal, chi-square, exponential and gamma populations. The results of the study indicate that the proposed calibration scheme is more precise than any of the others considered in this paper.
    Źródło:
    Statistics in Transition new series; 2021, 22, 2; 125-142
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite Barrier to Control the Corrosion of Mild Steel in Oil Well
    Autorzy:
    Singh, Rajesh Kumar
    Thakur, Manjay Kumar
    Kumar, Parshun
    Powiązania:
    https://bibliotekanauki.pl/articles/1030680.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    HCl
    Mild steel
    Saline water
    composite barrier
    filler
    thermal parameters
    Opis:
    Mild steel is a very important engineering metal. Petrochemical industries are used bulk amount for their various purposes like recovery of crude oil, refinery units and transportation. Crude oil is a very highly viscous liquid for the opening of the month well strong HCl acid and saline water is used. They produce hostile environment of mild steel. Gaseous substances like CO2 and SO2 gases are found into the well of petroleum. Large amount of saline water are used during recovery of crude oil in this water CO2 and SO2 are dissolved to produce H2CO3 and H2SO4. These acids create an acidic medium of mild steel. Saline waters have possessed Cl¯ ions. It produces ambient environment for mild steel. The solution of salty water contains dissolve oxygen which develop corrosive environment of mild steel. These major corrosive substances are available during recovery of crude oil and they form corrosion cell with base metal. Metal produces galvanic, pitting, stress, crevice, intergranular corrosion. Nanocaoting and filler methods are used to protect metal in such un-friendly environment. The corrosion rate of metal was calculated by weight loss experiment in absence and presence of nanocoating and filler materials. The synthesized organic compound octahydrodibenzo[a,d][8]annulene-5,12-dihydrazone is applied for nanocoating and MgS as filler. The coating and filling works were completed by chemical vapour deposition and nozzle spray method. Potentiostat used for determination corrosion potential and corrosion current density. The surface adsorption was studied by thermal parameters like activation energy, heat of adsorption, free energy, enthalpy and entropy. The thermal parameters results were shown that coating and filler compounds were adhered with base metal by chemical bonding. The thermal results were calculated by Arrhenius equation and Langmuir isotherm. The coating and the filler substance formed composite barrier with metal and developed a protective barrier for the corrosive substances.
    Źródło:
    World Scientific News; 2020, 139, 2; 155-172
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degrading systems availability analysis: analytical semi-Markov approach
    Autorzy:
    Kumar, Varun
    Kumar, Girish
    Singh, Rajesh Kumar
    Soni, Umang
    Powiązania:
    https://bibliotekanauki.pl/articles/1841831.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    availability
    perfect repair
    opportunistic maintenance
    Embedded Markov Chain (EMC)
    Cumulative Density Function (CDF)
    Semi-Markov Process (SMP)
    Opis:
    This paper deals with modeling and analysis of complex mechanical systems that deteriorate with age. As systems age, the questions on their availability and reliability start to surface. The system is believed to suffer from internal stochastic degradation mechanism that is described as a gradual and continuous process of performance deterioration. Therefore, it becomes difficult for maintenance engineer to model such system. Semi-Markov approach is proposed to analyze the degradation of complex mechanical systems. It involves constructing states corresponding to the system functionality status and constructing kernel matrix between the states. The construction of the transition matrix takes the failure rate and repair rate into account. Once the steady-state probability of the embedded Markov chain is computed, one can compute the steady-state solution and finally, the system availability. System models based on perfect repair without opportunistic and with opportunistic maintenance have been developed and the benefits of opportunistic maintenance are quantified in terms of increased system availability. The proposed methodology is demonstrated for a two-stage reciprocating air compressor with intercooler in between, system in series configuration.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 195-208
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degrading systems availability analysis: analytical semi-Markov approach
    Autorzy:
    Kumar, Varun
    Kumar, Girish
    Singh, Rajesh Kumar
    Soni, Umang
    Powiązania:
    https://bibliotekanauki.pl/articles/1841749.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    availability
    perfect repair
    opportunistic maintenance
    embedded Markov chain
    EMC
    cumulative density function
    CDF
    semi-Markov process
    SMP
    Opis:
    This paper deals with modeling and analysis of complex mechanical systems that deteriorate with age. As systems age, the questions on their availability and reliability start to surface. The system is believed to suffer from internal stochastic degradation mechanism that is described as a gradual and continuous process of performance deterioration. Therefore, it becomes difficult for maintenance engineer to model such system. Semi-Markov approach is proposed to analyze the degradation of complex mechanical systems. It involves constructing states corresponding to the system functionality status and constructing kernel matrix between the states. The construction of the transition matrix takes the failure rate and repair rate into account. Once the steady-state probability of the embedded Markov chain is computed, one can compute the steady-state solution and finally, the system availability. System models based on perfect repair without opportunistic and with opportunistic maintenance have been developed and the benefits of opportunistic maintenance are quantified in terms of increased system availability. The proposed methodology is demonstrated for a two-stage reciprocating air compressor with intercooler in between, system in series configuration.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 195-208
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A General Family of Dual to Ratio-Cum-Product Estimator in Sample Surveys
    Autorzy:
    Singh, Rajesh
    Kumar, Mukesh
    Chauhan, Pankaj
    Sawan, Nirmala
    Smarandache, Florentin
    Powiązania:
    https://bibliotekanauki.pl/articles/465772.pdf
    Data publikacji:
    2011
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    Family of estimators
    auxiliary variables
    bias
    mean-squared error
    Opis:
    This paper presents a family of dual to ratio-cum-product estimators for the finite population mean. Under simple random sampling without replacement (SRSWOR) scheme, expressions of the bias and mean-squared error (MSE) up to the first order of approximation are derived. We show that the proposed family is more efficient than usual unbiased estimator, ratio estimator, product estimator, Singh estimator (1967), Srivenkataramana (1980) and Bandyopadhyaya estimator (1980) and Singh et al. (2005) estimator. An empirical study is carried out to illustrate the performance of the constructed estimator over others.
    Źródło:
    Statistics in Transition new series; 2011, 12, 3; 587-594
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Organised Retail on Grocery Retail Suppliers
    Autorzy:
    Yadav, Rajesh K.
    Verma, Manoj
    Singh, Shriti
    Powiązania:
    https://bibliotekanauki.pl/articles/1182832.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Retail; Supply chain; Manufacturers and suppliers; transform
    Opis:
    The retail market in India is transforming due to flourishing of organised and online retailing. In the organized retail market in India the role of supply chain is very important for the Indian customer demands at affordable prices and a variety of product mix. It is the supply chain that ensures to the customer in all the various offerings that a company decide for its customers, be it cost, service, or the quickness in responding to ever changing tastes of the customer. Effective supply chain management has become a potential way nowadays to improve organisational performance through matching supply chain practices and competitive advantages in the competitive world. Organisations focus on better supply chain management practices to gain competitive advantage for better organisational performance. This paper focus on study the impact that manufacturers and suppliers of grocery retail that has due to growing organised retail market. The study was carried out in Indore market and 70 responses of manufacturers and suppliers were collected. Multivariate statistical techniques were used to analyze the data collected with the help of a structured questionnaire. Manufacturers and suppliers are getting benefitted and expanded their business as they have better coordination with organized retailer. Supply chain is a broader business function of retail and Manufacturers and suppliers are only covered in this paper.
    Źródło:
    World Scientific News; 2017, 62; 12-23
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of organised retail on neighborhood kirana stores: A case Study of Malwa region in Madhya Pradesh
    Autorzy:
    Yadav, Rajesh K.
    Verma, Manoj
    Singh, Shriti
    Powiązania:
    https://bibliotekanauki.pl/articles/1192680.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Transformation
    Retail
    Kirana
    Corporate Chain
    Organised and Unorganised
    India
    Opis:
    The growth and transformation of retail market in India, on one side creating a better shopping experience and other side it is creating a lot of pressure on unorganised retailers. The first objective of this study is to understand the perception of small kirana shops in relation to the impact they can have and the second is find the effect on their employment with the increasing number of corporate retail chain stores in the form of organised retail stores in corresponding grocery segment. The study was carried out in the market of Indore region and responses were collected from small neighbourhood kirana shops. Multivariate statistical techniques were used to analyze the data collected with the help of a structured questionnaire The result of the study shows that small neighbourhood kirana shop owner perceived that their profit is negatively affected, their operational cost is increased to meet the higher service quality expectation of the customer but the result do not show significant negative impact on their employment due to growth of corporate retail stores. The implication of the research is that kirana shops have to implement new strategies to face the competition from retail giants and meet the customer expectations to remain profitable in the long run.
    Źródło:
    World Scientific News; 2016, 46; 1-18
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An overview of Corporate Social Responsibility (CSR) in insurance sector with special reference to Reliance Life Insurance
    Autorzy:
    Yadav, Rajesh K.
    Jain, Richa
    Singh, Shriti
    Powiązania:
    https://bibliotekanauki.pl/articles/1192136.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Corporate Social Responsibility (CSR)
    Customer Perception
    Rise in Business Performances etc.
    Opis:
    Last decade has seen a remarkable change and upgrade in the way companies look and invest in corporate social responsibilities that they owe towards the society and the nation as a whole. CSR activities are those efforts undertaken by corporates to give back to the society as a whole from which they earn and become successful. This study aims in finding out how significant CSR activities are in making the customers’ perception towards a company with the overview of customers of Reliance Life Insurance. This study also intends to seek and show how a company can change customers’ perception towards its products and services by widening the scope of their CSR activities. Interview of Human Resource senior Official and 80 other customers were undertaken to complete this study. The findings of the study suggest that there is a significant rise in the business performances and a very positive customer perception towards Reliance Life Insurance through the conduction of CSR activities. Customers being aware are assertively looking forward to deal with companies that are active in CSR actions.
    Źródło:
    World Scientific News; 2016, 45, 2; 196-223
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Corporate Governance in Brand Building - A case study of PNB MetLife
    Autorzy:
    Yadav, Rajesh K.
    Jain, Richa
    Singh, Shriti
    Powiązania:
    https://bibliotekanauki.pl/articles/1182737.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Brand Building
    Corporate Governance
    Interest of Stakeholders etc.
    Opis:
    Corporate Governance provides for the rules, procedures, systems and processes using which a company is controlled and directed. This study aims in finding out how significant corporate governance is in building a brand for a company with the overview of customers and employees of PNB MetLife. As last decade has seen a remarkable change and upgrade in the way companies look for its corporate governance processes and procedures as this involves balancing the interests of all the stakeholders- shareholders, management, customers, suppliers, financiers government and the community. This study also intends to seek and show how a company can build its brand of the products and services by having a good control over its internal and external processes and procedures for work. Interview of senior officials at PNB MetLife has been undertaken, and also the data of 80 employees were undertaken to complete this study. The findings of the study suggest that the company has prospered and has been able to deliver good performances with regards to its corporate governance. Customers and employees are being aware and are assertively looking forward to deal with companies that are following corporate governance religiously.
    Źródło:
    World Scientific News; 2017, 66; 1-19
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Ratio-Cum-Product Estimator of Finite Population Mean in Systematic Sampling
    Autorzy:
    Tailor, Rajesh
    Jatwa, Narendra K.
    Singh, Housila P.
    Powiązania:
    https://bibliotekanauki.pl/articles/465754.pdf
    Data publikacji:
    2014
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    systematic sampling ratio-cum-product estimator
    bias
    mean squared error
    Opis:
    In this paper we consider the problem of estimation of population mean using information on two auxiliary variables in systematic sampling. We have extended Singh (1967) estimator for estimation of population mean in systematic sampling. We have derived the expressions for the bias and mean squared error of the suggested estimator up to the first degree of approximation. We have compared the suggested estimator with existing estimators and obtained the conditions under which the suggested estimator is more efficient. An empirical study has been carried out to demonstrate the performance of the suggested estimator.
    Źródło:
    Statistics in Transition new series; 2014, 15, 3; 391-398
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of T-6 cycle and Characterization of Si3N4 Reinforced High Strength Aluminum Metal Matrix Composites
    Autorzy:
    Kumar, Ashish
    Rana, Ravindra Singh
    Purohit, Rajesh
    Namdev, Anurag
    Powiązania:
    https://bibliotekanauki.pl/articles/28099516.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    stir casting
    microstructure
    mechanical properties
    optimization
    fractography
    Opis:
    In this research, AA7068/Si3N4 composites were fabricated through stir casting with the attachment of ultrasonic treatment. The quenching medium and aging duration significantly influenced the hardness of Al alloy samples. Peak hardness was achieved after 12 h of artificial aging at the temperature of 140°C. The addition of nano Si3N4 significantly refined the microstructure of unreinforced AA7068. The dispersion of intermetallic compounds (MgZn2) and grain boundary discontinuation were noticed after the T-6 heat treatment. Ultimate tensile strength, yield strength, and hardness were improved by 70.95%, 76.19%, and 44.33%, respectively, with the addition of 1.5 weight % Si3N4 compared to as-cast alloy due to the combined effect of heat treatment, hall-Petch, Orowan, thermal miss match, load-bearing strengthening mechanisms and uniform dispersion of reinforcement. A reduction in percentage elongation was noticed due to composites’ brittle nature by the effect of ceramic Si3N4 particles’ inclusion. The fracture surfaces reveal ductile failure for alloy and mixed-mode failure in the case of composites.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 775--783
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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