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1.
A new method for the calculation of time responses of lumped time invariant networks is presented. It is based on the numerical inversion of the Laplace transform and involves the computation of the frequency domain function at pre-assigned complex points and forming a weighted sum. The method exactly inverts a certain number of terms of the Taylor expansion of the time response and is thus equivalent to the methods used for the integration of differential equations. This equivalence is established on two examples. The order of integration can be changed between 1 and 46 without any difficulty. Additional properties resulting from the application of the numerical Laplace transform inversion are also discussed and some novel applications indicated. 相似文献
2.
R.P. Singhal 《International Journal of Educational Development》1983,3(1):61-70
Since independence in 1947, India has made a rapid development in all spheres, more particularly in the field of education. With the national commitment to provide educational opportunity to all citizens of the country and the highest priority given to the programme of universalisation of elementary education, the educational facilities have increased considerably over the years. Special attention is being paid to provide education to girls and to the children of the weaker sections of the community. Besides formal education, non-formal channels of education are also being exploited.This has increased the responsibilities of educational administrators manifold. The complexity and enormity of the tasks that they have to perform, the quality of leadership that they have to possess, the horizontal and vertical linkages that they have to establish within and outside the Education Department, and the managerial role that they have to discharge in order that the resources are effectively mobilised and utilised, have made it incumbent upon them to be familiar with the latest techniques of planning and management.The National Institute of Educational Planning and Administration (NIEPA) which is a specialised Central Institution for advanced training of key educational personnel has for the past two decades been playing an important role in building up the capabilities of different kinds of educational functionaries and serving as a catalytic agent for change.The need for training of educational administrators of all levels is now well recognised in India. In a developing country where there are certain aspirations of students, teachers, parents and community about education and where quantity, quality and equity all play a vital role, the development of professional skills in the educational administrators assumes great importance. Such a training not only leads to human resource development and an increase in the productivity of the officers but it also helps in the speedy realisation of the targets of educational and social development. 相似文献
3.
Kwon YH Como CS Singhal K Lee S Han KH 《Sports biomechanics / International Society of Biomechanics in Sports》2012,11(2):127-148
The purposes of this study were (1) to determine the functional swing plane (FSP) of the clubhead and the motion planes (MPs) of the shoulder/arm points and (2) to assess planarity of the golf swing based on the FSP and the MPs. The swing motions of 14 male skilled golfers (mean handicap = -0.5 +/- 2.0) using three different clubs (driver, 5-iron, and pitching wedge) were captured by an optical motion capture system (250Hz). The FSP and MPs along with their slope/relative inclination and direction/direction of inclination were obtained using a new trajectory-plane fitting method. The slope and direction of the FSP revealed a significant club effect (p < 0.001). The relative inclination and direction of inclination of the MP showed significant point (p < 0.001) and club (p < 0.001) effects and interaction (p < 0.001). Maximum deviations of the points from the FSP revealed a significant point effect (p < 0.001) and point-club interaction (p < 0.001). It was concluded that skilled golfers exhibited well-defined and consistent FSP and MPs, and the shoulder/arm points moved on vastly different MPs and exhibited large deviations from the FSP. Skilled golfers in general exhibited semi-planar downswings with two distinct phases: a transition phase and a planar execution phase. 相似文献
4.
A simple numerical method for computing the time domain response of linear time invariant systems described by their transfer functions is presented. The method does not require computation of transfer function poles or residues; it is not influenced by the multiplicity of poles or zeroes, nor does it require computation of the matrix exponential. Rather, it is based on a numerical method for inverting Laplace transforms. It is equivalent to very high order, absolutely stable numerical integration. Stiff systems present no problems. 相似文献
5.
The Cult of Our Lady of Guadalupe, the product of appropriations authored by both the Aztecs and the Roman Catholic Church, has served as a tool of empowerment, dominion, and accommodation. Central to this contested cult is an indigenous reinvention of the Virgin Mary that is simultaneously index, icon, and symbol. This study demonstrates the difficulties in attempting to selectively appropriate the desirable features of such a sign while excluding those deemed undesirable. In attempting to appropriate certain features of the Virgin it deemed desirable, the authors argue, the Church also annexed aspects of the Aztec religious tradition at odds with the teachings of Catholicism. While Catholicism's attempt to co‐opt this Virgin extended the influence of the institutional Catholic Church, the authors suggest, it also undermined the integrity of the faith the Church promotes by fostering a form of popular Catholicism contrary to the teachings and practices of orthodox Catholicism. This study is grounded in data obtained through interviews conducted with pilgrims in the vicinity of the Basilica of Our Lady of Guadalupe immediately prior to, during, and after the Virgin's annual feastday (December 12). The authors also draw upon anthropological, historical, and religious studies scholarship to make sense of the pilgrims’ beliefs and place them within the broader historical and religious contexts in which they operate. 相似文献
6.
Online open source software platforms, such as Sourceforge.net, play a vital role in creating an ecosystem that enables the creation and growth of open source projects. However, there is little research exploring the interactions between open source stakeholders and the platform. We believe that the sustainability of the platform crucially depends on financial incentives. While platforms can obtain these incentives through multiple means, in this paper we focus on one form of financial incentives—voluntary monetary donations by open source community members. We report findings from two empirical studies that examine factors that impact donations. Study 1 investigates the factors that cause some community members to donate and not others. We find that the decision to donate is impacted by relational commitment with open source software platform, donation to projects and accepting donations from others. Study 2 examines what drives the level of donation. We find that the length of association with the platform and relational commitment affects donation levels. 相似文献
7.
Arvind Chandrasekaran Shanmugasundaram Pakkiriswami Jian Liang You Ashwin Acharya Muthukumaran Packirisamy Denis Maxwell 《Biomicrofluidics》2008,2(3)
90 kDa heat shock protein (HSP90) is a ubiquitous molecular chaperone and is one of the abundant proteins present in a cell under normal and stressed conditions. The adenosine triphosphate (ATP) binding region of HSP90 is currently under a great degree of study because of the interest of its role in cancer and protein maintenance; the binding of ATP to HSP90 induces a large conformational change in the protein as a result of the activity of different types of stressors within the cells. In the present paper, a simple microfluidic biosensor is proposed for the characterization of ATP-HSP90 interactions through the principle of bioresistive variation. The experimental results prove that the present biosensor system is highly suitable for the detection of heat shock proteins present in a real-time biological sample, which is very useful for in-situ biomedical applications and rapid pathogenic detections. 相似文献
8.
The open source software (OSS) movement thrives on innovation and volunteer effort of developers. Scholars have expressed widespread concern about the sustainability of the OSS movement due to high levels of volunteerism. In this paper, we address a central challenge to the sustainability of OSS-developers’ acceptance of monetary rewards. We strive to explain why some OSS developers accept monetary rewards and others do not. Viewed through the theoretical lens of the private-collective innovation model (0395 and 0400), this allows us to describe when developers will accept private financial rewards. Our main research objective is to clearly map the web of relationships between causal antecedents, and developers’ acceptance behavior. Using a unique dataset that combines survey and behavioral measures, we find that – (a) intention to accept monetary rewards mediates the impact of motivational elements on developers’ acceptance of monetary rewards; (b) intrinsic and extrinsic motivations positively affect their intention to accept monetary rewards, community motivation negatively impacts intention and ideological motivation does not affect the intention to accept rewards and (c) these effects are obtained even after inclusion of several control variables. The theoretical and managerial implications of our work are described. 相似文献
9.
Young-Hoo Kwon Ki Hoon Han Christopher Como Sangwoo Lee Kunal Singhal 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):231-246
The purpose of this study was to assess the validity of the X-factor computation methods and to examine whether direct relationships exist between the X-factor parameters and the clubhead velocity in a group of skilled male golfers (n = 18, handicap = ? 0.6 ± 2.1). Five driver trials were captured from each golfer using an optical motion capture system (250 Hz). Two plane-based methods (conventional vs. functional swing plane-based) and one Cardan rotation-based method (relative orientation) were used to compute select X-factor (end of pelvis rotation, top of backswing, ball impact (BI), and maximum), X-factor stretch (stretch and maximum stretch), and X-factor velocity (BI and maximum) parameters. The maximum clubhead velocity was extracted and normalized to golfer's body height to eliminate the effect of body size. A one-way repeated MANOVA revealed that the computation methods generated significantly different X-factor parameter values (p < 0.001). The conventional method provided substantially larger X-factor values than the other methods in the untwisting phase and the meaningfulness of select X-factor parameters generated by this method was deemed questionable. The correlation analysis revealed that the X-factor parameters were not directly related to the maximum clubhead velocity (both unnormalized and normalized). 相似文献
10.
Under the combined effects of commercialisation, urbanisation, migration and employment, significant changes are taking place in India’s process of modernisation. One change is the emergence of a population of women with degrees in higher education. These degrees, and the individuals’ desire to pursue professional positions that relate to their education, may influence the ways in which women perceive their identity. This study explores the situations and circumstances of college‐educated Indian females’ identity and illuminates the complexities and consequences of the university‐educated Indian woman’s life. Twenty‐five women from different parts of India were interviewed. The findings, which emerged by marital status, showed identities of single women appeared to be influenced by their interest to maintain a positive attitude about life, develop cognitive intelligence that relates to an interest, and explore the meanings of and learn independence. The identity of married, divorced and widowed women appeared to be affected by their goal to pursue an interest; need to balance personal interests and family responsibilities; and obligation to live in an extended family. The results are discussed in the context of shifting roles of women and the adoption of multifaceted identities. 相似文献