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Systematic Development (systematic + development)

Distribution by Scientific Domains

Engineering	50%

Selected Abstracts

Conservation properties of a time FE method.

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 13 2005
Part IV: Higher order energy, momentum conserving schemes
Abstract In the present paper a systematic development of higher order accurate time stepping schemes which exactly conserve total energy as well as momentum maps of underlying finite-dimensional Hamiltonian systems with symmetry is shown. The result of this development is the enhanced Galerkin (eG) finite element method in time. The conservation of the eG method is generally related to its collocation property. Total energy conservation, in particular, is obtained by a new projection technique. The eG method is, moreover, based on objective time discretization of the used strain measure. This paper is concerned with particle dynamics and semi-discrete non-linear elastodynamics. The related numerical examples show good performance in presence of stiffness as well as for calculating large-strain motions. Copyright © 2005 John Wiley & Sons, Ltd. [source]

Small-signal analysis of interleaved dual boost converter

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 6 2001
Mummadi Veerachary
Abstract This paper presents a systematic development of steady-state, small-signal models of interleaved dual boost converter operating in a continuous current mode. These models are derived by employing the well-known signal flow graph method. This signal flow graph approach provides a means to directly translate the switching converter into its equivalent graphic model, from which a complete behaviour of the converter can easily be studied. Steady-state performance, small-signal characteristic transfer functions are derived using Mason's gain formula. The bode plots of audiosusceptibility, input impedance, output impedance, and control-to-output transfer functions are determined and illustrated using MATLAB for different values of load resistances, duty ratios. Small-signal frequency responses obtained from the signal flow graph method are validated with PSPICE simulator results. To validate the signal flow graph modelling equations, sample steady-state experimental results are provided. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Introduction to the Special Issue on Comparative Chinese/American Public Administration

PUBLIC ADMINISTRATION REVIEW, Issue 2009
Marc Holzer
In the field of public administration practice, China has a history of several thousand years, whereas the United States has a much shorter history of hundreds of years of governance. In terms of the scholarly development of public administration in China, the roots of those intellectual resources can be traced far back, to Confucius's ideology of governance and the ancient development of a civil service system some 2,000 years ago. In terms of the systematic development of public administration as an independent subject of learning, however, the United States has been a leader worldwide. Public administration as a discipline in the United States dates back to the late nineteenth century, with extensive scholarly research and publications in the early twentieth century (Follett 1926; Goodnow 1900; Taylor 1912; Weber 1922; White 1926). In the Chinese context, although there were occasional studies of public administration in the first half of the twentieth century, systematic study was deferred until the middle of the 1980s. They were only truly continued following the official launch of master of public administration degree programs at the beginning of the twenty-first century. In this respect, China was a latecomer, and Chinese scholars almost always date the study and scholarship in this field to about 1980. Over the past eighty years or so, the United States has established more than 200 MPA and related programs, while China has founded 100 MPA programs in just the past eight years. Recognizing the urgent need for MPA training, China is trying to catch up to the demand for social development and societal transition. Considering that China has a population of 1.3 billion, compared to a population of 300 million in the United States, it looks as if there is great potential for China to expand its MPA programs. [source]

Increasing access to clinical and educational studies

CANCER, Issue S8 2006
Ronald E. Myers PhD
Abstract In 2001, the National Cancer Institute (NCI) provided funds to support the Increasing Access to Clinical and Educational Studies (ACES) Project of the Thomas Jefferson University, Kimmel Cancer Center in Philadelphia. The ACES Project enabled the Center to engage in the systematic development of approaches for reducing cancer health disparities among African Americans in Philadelphia. This project brought together community partners, clinical partners, cancer prevention and control experts, and staff from an NCI-designated cancer center to develop and implement a community-based outreach education program, a special populations investigator (SPI) training program, and SPI pilot studies in cancer screening and clinical trials participation. At the end of 5 years, the ACES Project had 1) organized a steering committee, expert panel, and a network of community collaborators and clinical partners; 2) implemented a clinical trials education program for community-based nurses, lay health advocates active in community organizations, and health ministries in community churches; 3) mentored 4 SPIs in cancer prevention and control research; 4) completed SPI pilot studies; and 5) leveraged these activities to gain support for cancer health disparities related research. The Project established a successful dialogue between an NCI-designated cancer center and the African American population related to cancer research, and enabled SPIs from the community to adapt evidence-informed interventions for application in cancer prevention and control research. Lessons learned from the Project can guide the implementation of such projects in the future. Cancer 2006. © 2006 American Cancer Society. [source]