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Search Results: 1 - 10 of 4104 matches for " Michal Fe?kan "
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Bifurcations of planar sliding homoclinics
Jan Awrejcewicz,Michal Fe kan,Pawel Olejnik
Mathematical Problems in Engineering , 2006, DOI: 10.1155/mpe/2006/85349
Abstract: We study bifurcations from sliding homoclinic solutions to bounded solutions on ℝ for certain discontinuous planar systems under periodic perturbations. Sufficient conditions are derived for such perturbation problems.
Bifurcations of planar sliding homoclinics
Jan Awrejcewicz,Michal Fekan,Pawel Olejnik
Mathematical Problems in Engineering , 2006,
Abstract: We study bifurcations from sliding homoclinic solutions to bounded solutions on for certain discontinuous planar systems under periodic perturbations. Sufficient conditions are derived for such perturbation problems.
Design and Performance of Brushless Doubly-fed Machine Based on Wound Rotor with Star-polygon Structure  [PDF]
Chaohao Kan
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B015
Abstract: The star-polygon brushless doubly-fed machine (SPBDFM) is a new type of wound-rotor machine and is attractive for variable-speed constant-frequency shaft generation system. The structure of rotor for the machine may be improving the conductor availability of the rotor windings. The kirchhoff laws is employed to illuminate the principle and some combinations of different slots and poles are presented as the examples. Harmonic analysis is also employed to analyze the magnetic motive force (MMF) waveform of rotor winding with the structure of star- polygon. Finally, the results are used to reveal that the SPBDFM is attractive for shaft generation system.
Childhood lymphomas – a brief overview
FE Omar
Continuing Medical Education , 2010,
Abstract: The term ‘lymphoma’ refers to malignant proliferation of lymphoid cells, usually in association with and arising from lymphoid tissues (i.e. lymph nodes, thymus, spleen).1 Lymphomas are closely related to lymphoid leukaemias, which also originate in lymphocytes but typically involve only circulating blood and the bone marrow (where blood cells are generated in a process termed haematopoiesis) and do not usually form static tumours.2,3
Notas sobre literatura femenina
Marina Fe
Política y cultura , 1996,
Abstract:
O público, esse desconhecido
Pompeu Fe
Revista Estudos Feministas , 2003,
Abstract:
Characterization of Genotypic Mutations and Antiretroviral Resistance among Viremic HIV-Infected Patients in a High HIV Prevalence Area: Treatment Challenge and Transmission Risk  [PDF]
AliAsad Arastu, Virginia Kan
World Journal of AIDS (WJA) , 2011, DOI: 10.4236/wja.2011.13011
Abstract: There have been few reports evaluating the prevalence of genotypic mutations and antiretroviral resistance among chronic HIV-infected Veterans within the United States. This retrospective cross-sectional study characterizes the rates and changes in HIV genotypic mutations and antiretroviral resistance among viremic patients from 2001 to 2006 at the VA Medical Center located in Washington, DC. The District of Columbia is the metropolitan area with the highest HIV prevalence within the United States. De-identified, linked HIV RNA, genotypic reverse transcriptase (RT) and protease (Pr) mutations and antiretroviral resistance results were assessed for changes during the 6-year period. Aggregated clinic and antiretroviral utilization, and HIV acquisition risk data were evaluated for patients in care during this time. Among 990 viremic samples, the rate of any detected RT or Pr mutation fell from 100% in 2001 to 95% in 2006. This was primarily attributable to the 15% - 20% decrease seen for RT gene mutations against nucleoside/nucleotide class and non-nucleoside class during this period. Resistance to didanosine, stavudine, zidovudine, nevirapine and efavirenz decreased, and tenofovir resistance increased. Despite stable rates of Pr gene mutations, atazanavir resistance increased by 22% from 2003 to 2006. Some but not all changes in genotypic mutations and resistance patterns reflected our patients’ antiretroviral drug utilization. As sexual contacts (77%) and injection drug use (22%) were the leading acquisition risks disclosed by our HIV-infected patients, the high prevalence and changing patterns of HIV genotypic mutations and drug resistance among these patients have had pivotal impacts not only on HIV treatment but potential transmission into our community.
An Optimization Technique for Inverse Crack Detection  [PDF]
H?kan Wirdelius
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.513121
Abstract:

Any attempts to apply techniques that are based on indirect measurements of parameters that are believed to correlate to any material properties (or state) in an in-line situation must by necessity identify a mathematical model of this relationship. The most conventional approach is to use some empirically based model. If the analysis instead is based on an analytical model of a physical explanation, this trainee period can be minimized and the system is more dynamic and less sensitive to changes within the chain of production. A numerical solution to the inverse problem of ultrasonic crack detection is in this case investigated. This solution is achieved by applying optimization techniques to a realistic model of the ultrasonic defect detection situation. This model includes a general model of an ultrasonic contact probe working as transmitter and/or receiver and its interaction with the defect. The inverse problem is reduced to minimization of a nonlinear least squares problem and is performed with a quasi-Newton algorithm consisting of a locally convergent SVD-Newton method combined with a backtracking line search algorithm. The set of synthetic data the model is fitted with are generated both by numerical integration and with the two-dimensional stationary-phase method while the forward solver in the optimization procedure is based on the latter. In both these cases, the convergence, in terms of numbers of iterations, is sufficient when the initial guess is reasonably close.

Successful Painful Treatment of the Painful Achilles Was the Start for Research Providing New Knowledge about Tendon Pain and New Treatment Methods  [PDF]
H?kan Alfredson
Pain Studies and Treatment (PST) , 2014, DOI: 10.4236/pst.2014.22013
Abstract:

Successful treatment with painful eccentric training for patients with chronic painful midportion Achilles tendinosis started research on pain mechanisms involving ultrasound + Doppler investigations and immunohistochemical analyses of tendon tissue specimens. This research has resulted in a better understanding of the pain mechanisms involved in the chronic painful Achilles and patellar tendon, and based on these findings new non tendon-invasive treatment methods beneficial for the patients have been invented. This is a mini review showing the background and research that resulted in the highly successful mini surgical treatments for mid-portion Achilles tendinopathy and proximal patellar tendinopathy.

The Relationship between Self-Directed Learning Skills and Science Achievement among Qatari Students  [PDF]
Ashraf Kan’an, Kamisah Osman
Creative Education (CE) , 2015, DOI: 10.4236/ce.2015.68082
Abstract: This study is aimed to investigate the relationship between students’ self-directed learning readiness and their science achievement. 83 students were randomly selected from a secondary school in Qatar. The students’ self-directed learning readiness was measured by the Self-Directed Learning Readiness Scale (SDLRS) and their science achievement was determined by the science subject National Exam (NE) scores. The findings of the study showed that SDLRS total score significantly predicted the National Exam science subject score (p = .049). It was suggested that self-directed learning is essential for students to be academically successful to their fullest potential. Therefore, attention should be given to possible causal factors of self-directed learning.
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