581 research outputs found
On testing against positive quadrant dependence based on matched pairs
No full textA new class of tests based on matched pairs for testing against positive quadrant dependence is proposed by considering the convex combination of the two statistics, which are functions of subsample order statistics. The class of tests proposed by Kochar and Gupta (1987), Shetty and Pandit (2003), Pandit (2003), Pandit and Savitha (2013) and Kendall's test are members of the proposed class of test statistics. The asymptotic normality of the proposed class of tests is established. It has been observed that some members of the class perform better than the existing tests in the literature. Unbiasedness and consistency of the proposed class of tests have been established
Helio tracker: P.V. integrated shading device
No full textThe EU is committed to reducing the energy used and Co2 produced by 2050. Every component plays an important part in building an energy efficient building. This thesis looks at P.V. integrated shading devices.Shading devices are designed to block the excess solar radiation coming into the building to reduce the energy load of a building. This surface can be utilized to generate electricity by adding P.V. panels. P.V. panels are more efficient if they track the sun’s movement to increase the amount of solar radiation falling on the surface. The existing solar tracking devices fail due to multiple gears and the load of the panel on the rotational device.To tackle this problem heliotropic plants were studied. Heliotropic plants follow the sun’s movement to receive more solar radiation for photosynthesis. The internal mechanisms and forces of a sunflower (heliotropic plant) that cause this movement was analysed through an experiment and digital image correlation. The analysis showed that the sunflower’s stem utilizes water to expand and contract the sides of the stem in a diurnal pattern so that the stem can track the sun. This expansion and contraction curves the stem to move it 14 degrees which is sufficient to increase the solar radiation on the plant. This property of expansion and contraction was taken forward to design a sun tracking P.V. integrated shading to produce more energy. The expansion and contraction of the device were enabled by utilizing segments that were moved by piezo electric actuators. The Piezo electric actuator uses the energy generated from the P.V. panel and converts it to mechanical energy which enables the rotation of the device.To find the angle for rotation a simulation was made to find the angle at which the P.V. panel produces the most energy and the angle at which the shading device reduces the load on the heating or cooling device. The device is designed to track the change in the sun's altitude as this rotation produces the most energy for a P.V. panel and a shading device. The device responds to the change in altitude four times a year as this corresponds to the seasons to which the shading device rotates. There were two simulations made for the energy saved by the P.V. integrated shading device. The first simulation was for the Netherlands, factoring the energy saved by the shading device and the energy losses by the mechanical parts the device produces 196kW/ year and reduces the heating and cooling load by 16%. In Abu Dhabi, the same device produces 777kW/ year which reduces the cooling load by 15%.<br/
TEST PROCEDURES FOR DETECTING ‘MORE NBUNESS’ PROPERTY OF LIFE DISTRIBUTIONS
No full textTesting the hypothesis of no ageing against positive ageing has been
considered by many authors in the literature. However, very few tests
procedures for detecting whether a life distribution possesses ‘more positive
ageng’ than the other distribution are developed. Hollander, Park and
Proschan (1986) proposed a test procedure to detect ‘More NBU-ness’
property of life distributions, Pandit and Gudaganavar (2009) developed a
procedure which is an improvement over the test due to Hollander, Park
and Proschan (1986). In this paper, a test is developed to decide whether
one life distribution possesses more ‘new better than used’ (NBU) property
than does another life distribution. The asymptotic performance of the tes
PROCEDURE FOR DETECTING ‘MORE NBU-NESS’ PROPERTY OF LIFE DISTRIBUTIONS
No full textTesting the hypothesis of no ageing against positive ageing has been considered by many authors in the literature. However, very fewtests procedures for detecting whether a life distribution possesses ‘more positive ageng’ than the other distribution are developed.Hollander, Park and Proschan(1986) proposed a test procedure to detect ‘More NBUness’ property of life distributions. Pandit and Gudaganavar(2009) developeda procedure which is an improvementover the test due to Hollander, Park and Proschan(1986). In this
paper, a test is developed to decide whether onelife distribution possesses more ‘new
better than used’ (NBU)property than does another life distribution. The asymptotic
performance of the test procedure is evaluated interms of Pitman asymptotic relative
efficiency. It is found that new test performs betterthan the tests in the literature
Repeated significance test procedure for testing against new better than used of specified age
No full textIn life testing and clinical trials observations are available over a period of time. In those cases a sequential or multistage test might be appropriate. One alternative is to develop non-parametric repeated significance test (RST) procedure discussed in detail by Sen (1978). It is pointed out that from time and cost consideration the RST is more desirable and it is no less efficient than the terminal test in asymptotic sense. Alam and Basu (1990) developed RST for testing exponentiality against new better than used alternative. Recently, Pandit and Shirke (2006) considered the problem of testing exponentiality against increasing failure rate alternatives using non-parametric RST procedure. In this paper, we have developed RST procedure for testing exponentiality against NBU-t0 alternatives based on a U-statistic with a kernel of degree two which is proposed for this problem with fixed sample size by Hollander, Park and Proschan (1986). The asymptotic null distribution of this procedure is studied. The estimates of the expected sample size and power of the test procedure are obtained using simulation experiments for Weibull, Linear failure rate and Exponentiated exponential distributions as alternatives. The study shows that there is considerable amount of saving with respect to the number of observations required to arrive at a decision
Book Review on Puspayurvedah - A unique contribution of Prof. P.V. Sharma
No full text"Puspayurvedah" authored by Prof. P.V. Sharma, is a scholarly collection of the use of flowers in the Ayurvedic system of medicine. Despite being a specialized subject, traditional Indian medicine heavily relies on the therapeutic qualities, historical importance, and medicinal qualities of diverse flowers. The author painstakingly catalogs a vast variety of flowers using the botanical features and medicinal properties found in traditional Ayurvedic texts. The book offers academicians and clinicians, a thorough knowledge of traditional uses of flowers. "Puspayurvedah" is not only a useful academic resource but also a useful guide for anyone who wants to use floral remedies in Ayurvedic therapy because of its practical formulations and applications. The book is notable for its comprehensiveness and depth of knowledge
From “Made in China” to “Created in China”: Development of ICT-enabled medical device and system for rural China
No full textHealth problems are a major concern for rural Chinese people. One of the causes is shortages of medical resources, such as medical equipment and skilled medical staff. Information and Communication Technology (ICT) is usually seen as a useful tool, by which medical resources in urban areas can be accessed for rural areas. Design and development of ICT-enabled Medical device and system for Rural China (DIMRC) is therefore considered to be a key approach of the Chinese central government in the development of rural healthcare. In practice, however, the gap between ideal ICT-enabled medical devices and systems and what is currently available in rural markets is still huge. Both the quantity and quality of existing ICT-enabled medical applications fall short of meeting the requirements of patients and doctors. To bridge this gap, the Chinese government has been encouraging local Chinese Research and Development (R&D) teams (from local companies and universities) to design and develop ICT-enabled medical devices and systems with appropriate innovations, suitable specifically for China. This is a part of China’s recent product development strategy, dubbed “Created in China”. This strategy encourages the local development of products in China by national brands, and increasingly replaces the “Made in China” strategy. There are several steps to be taken to reduce the gap between the ideal ICT-enabled medical devices and systems and those currently available in the rural markets. This PhD study focuses on one aspect: exploring what design competences of Chinese R&D teams should be improved and how to improve them. Three methods are used in this study: literature analysis, practice-based research, and interviews. The results of this thesis have revealed three issues that demand attention if the design competences of Chinese R&D teams are to be augmented: (1) R&D teams should have a deep understanding of China’s culture with reference to DIMRC; (2) the teams should have more knowledge about identification of design factors for DIMRC; and (3) the teams should have more knowledge to apply existing design methodologies to DIMRC. The results of this thesis were utilised to develop a new framework for DIMRC. In addition, an education module for integration into Chinese biomedical engineering education has been created. Finally both results were evaluated by one Chinese biomedical engineering professor and one senior biomedical engineer from a Chinese medical device company.Design EngineeringIndustrial Design Engineerin
Meanings of Materials
No full textThis book is about meanings we attribute to materials of the objects around us. Materials convey meanings: they look traditional, they express luxury, they are associated with factories, or they conjure up one’s childhood. How do materials obtain these meanings? How do they interact with other elements of product design in expressing certain meanings? How can designers systematically incorporate meaning considerations into their materials selection processes? This book presents the concept of meanings of materials and has made a start in making this concept more actionable in design thinking.Design EngineeringIndustrial Design Engineerin
High-efficiency biomass gasifier SOFC systems with direct internal tar reforming
No full textRemoving biosyngas contaminants is crucial for the efficient and safe operation of biomass gasifier solid oxide fuel cells systems. Among the contaminants, tar might be considered an additional fuel if converted into H2 and CO in a reformer or directly in the SOFC. However, no sufficient information is available on direct internal tar reforming. The knowledge gained during the 4-years project FlexiFuel-SOFC is presented. The aim of these studies was to determine the possibility to directly reform tar in the SOFC, and to assess the influence that other biosyngas contaminants (i.e., H2S and HCl) can have on the process. Benzene can be regarded as fuel, while naphthalene as a contaminant. Also toluene can be reformed inside the SOFC, but HCl seems to affect the process. Acetic acid is completely converted inside SOFCs and its conversion appears not affected by H2S. However, it causes carbon deposition, mainly in the inlet pipelines.Accepted Author ManuscriptEnergy Technolog
A sizzling hand prosthesis: On the design and development of a pneumatically powered hand prosthesis for children
No full textMechanical, Maritime and Materials Engineerin
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