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Search Results: 1 - 10 of 144364 matches for " Tain? F.; "
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Adaptive Piecewise Linear Controller for Servo Mechanical Control Systems  [PDF]
Tain-Sou Tsay
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.15013

In this paper, an adaptive piecewise linear control scheme is proposed for improving the performance and response time of servo mechanical control systems. It is a gain stabilized control technique. No large phase lead compensations or pole zero cancellations are needed for performance improvement. Large gain is used for large tracking error to get fast response. Small gain is used between large and small tracking error for good performance. Large gain is used again for small tracking error to cope with disturbance. It gives an almost command independent response. It can speed up the rise time while keeping robustness unchanged. The proposed control scheme is applied to a servo system with large time lag and a complicated electro-hydraulic velocity/position servo system. Time responses show that the proposed method gives significant improvements for response time and performance.

Um filho quando eu quiser?: o caso da Fran?a contemporanea
Tain, Laurence;
Revista Estudos Feministas , 2005, DOI: 10.1590/S0104-026X2005000100004
Abstract: choosing freely motherhood and its calendar was a central and unanimous claim of the women's lib in the seventies. first, women and professionals belonging to the medical circle fought together to make contraception and abortion available. nevertheless, feminists have been divided before reproductive technologies that could allow to delay pregnancies: would this medicalization of procreation contribute to emancipate women from time constraints or, on the contrary, contribute to lock them into a maternal destiny? this paper will try to shed light on this problem by discussing ivf social experience in france during the last two decades.
Pharmacy practice simulations: performance of senior pharmacy students at a University in southern Brazil
Galato,Dayani; Alano,Graziela M.; Trauthman,Silvana C.; Fran?a,TainF.;
Pharmacy Practice (Internet) , 2011, DOI: 10.4321/S1886-36552011000300004
Abstract: objective: a simulation process known as objective structured clinical examination (osce) was applied to assess pharmacy practice performed by senior pharmacy students. methods: a cross-sectional study was conducted based on documentary analysis of performance evaluation records of pharmacy practice simulations that occurred between 2005 and 2009. these simulations were related to the process of self-medication and dispensing, and were performed with the use of patients simulated. the simulations were filmed to facilitate the evaluation process. it presents the osce educational experience performed by pharmacy trainees of the university of southern santa catarina and experienced by two evaluators. the student general performance was analyzed, and the criteria for pharmacy practice assessment often identified trainees in difficulty. results: the results of 291 simulations showed that students have an average yield performance of 70.0%. several difficulties were encountered, such as the lack of information about the selected/prescribed treatment regimen (65.1%); inadequate communication style (21.9%); lack of identification of patients′ needs (7.7%) and inappropriate drug selection for self-medication (5.3%). conclusions: these data show that there is a need for reorientation of clinical pharmacy students because they need to improve their communication skills, and have a deeper knowledge of medicines and health problems in order to properly orient their patients.
Responding to the maternal health care challenge: The Ethiopian Health Extension Program
M Koblinsky, F Tain, A Gaym, A Karim, M Carnell, S Tesfaye
Ethiopian Journal of Health Development , 2010,
Abstract: Background: Responding to challenges in achieving Millennium Development Goals (MDG), the Ethiopian government initiated the Health Extension Program in 2003 as part of the Health Sector Development Program (HSDP) to improve equitable access to preventive, promotive and select curative health interventions through paid community level health extension workers. Objective: To explore Ethiopia’s progress toward achieving MDG 5 that focuses on improved maternal health through the Health Extension Program. Methods: This paper reviews available survey data and literature to determine the feasibility of reaching the targets specified for MDG 5 and for HSDP. Important findings: Achieving the set targets is a daunting task despite reaching the physical targets of two health extension workers per kebele. The 2015 MDG target for the Maternal Mortality Ratio (MMR) is 218 while the 2005 MMR estimate is 673. The HSDP target is 32% skilled birth attendant use by 2010 but only about 12% use was found in the four most populated regions of the country in 2009. Conclusions: Accelerating progress towards these targets is possible through the Health Extension Program at the worker level through improved promotion of family planning and specific maternal interventions, such as misoprostol for active management of third stage of labor, immediate postpartum visits, and improved coordination from community to referral level. [Ethiop. J. Health Dev. 2010;24 Special Issue 1:105-109]
Phylogenetic relationship of the Brazilian isolates of the rat lungworm Angiostrongylus cantonensis (Nematoda: Metastrongylidae) employing mitochondrial COI gene sequence data
Monte Tainá CC,Sim?es Raquel O,Oliveira Ana Paula M,Novaes Clodoaldo F
Parasites & Vectors , 2012, DOI: 10.1186/1756-3305-5-248
Abstract: Background The rat lungworm Angiostrongylus cantonensis can cause eosinophilic meningoencephalitis in humans. This nematode’s main definitive hosts are rodents and its intermediate hosts are snails. This parasite was first described in China and currently is dispersed across several Pacific islands, Asia, Australia, Africa, some Caribbean islands and most recently in the Americas. Here, we report the genetic variability among A. cantonensis isolates from different geographical locations in Brazil using mitochondrial cytochrome c oxidase subunit I (COI) gene sequences. Methods The isolates of A. cantonensis were obtained from distinct geographical locations of Brazil. Genomic DNAs were extracted, amplified by polymerase reaction, purified and sequenced. A partial sequence of COI gene was determined to assess their phylogenetic relationship. Results The sequences of A. cantonensis were monophyletic. We identified a distinct clade that included all isolates of A. cantonensis from Brazil and Asia based on eight distinct haplotypes (ac1, ac2, ac3, ac4, ac5, ac6, ac7 and ac8) from a previous study. Interestingly, the Brazilian haplotype ac5 is clustered with isolates from Japan, and the Brazilian haplotype ac8 from Rio de Janeiro, S o Paulo, Pará and Pernambuco states formed a distinct clade. There is a divergent Brazilian haplotype, which we named ac9, closely related to Chinese haplotype ac6 and Japanese haplotype ac7. Conclusion The genetic variation observed among Brazilian isolates supports the hypothesis that the appearance of A. cantonensis in Brazil is likely a result of multiple introductions of parasite-carrying rats, transported on ships due to active commerce with Africa and Asia during the European colonization period. The rapid spread of the intermediate host, Achatina fulica, also seems to have contributed to the dispersion of this parasite and the infection of the definitive host in different Brazilian regions.
Automatic Regulation Time Series for Industry Processes
Tain-Sou Tsay
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/710690
Abstract: A nonlinear digital control scheme is proposed for analyses and designs of stable industry processes. It is derived from the converging characteristic of a specified numerical time series. The ratios of neighbourhoods of the series are formulated as a function of the output of the plant and the reference input command and will be converted to be unities after the output has tracked the reference input command. Lead compensations are also found by another numerical time series to speed up the system responses on the online adjusting manner. A servosystem, a time-delay system, a high-order system, a very-high-order system, and a 2 × 2 multivariable aircraft gas turbine engine are used to illustrate effectiveness of the proposed nonlinear digital controller. Comparisons with other conventional methods are also made.
Limit Cycle Predictions of Nonlinear Multivariable Feedback Control Systems with Large Transportation Lags
Tain-Sou Tsay
Journal of Control Science and Engineering , 2011, DOI: 10.1155/2011/169848
Abstract: A practical method is developed for limit-cycle predictions in the nonlinear multivariable feedback control systems with large transportation lags. All nonlinear elements considered are linear independent. It needs only to check maximal or minimal frequency points of root loci of equivalent gains for finding a stable limit-cycle. This reduces the computation effort dramatically. The information for stable limit-cycle checking can be shown in the parameter plane also. Sinusoidal input describing functions with fundamental components are used to find equivalent gains of nonlinearities. The proposed method is illustrated by a simple numerical example and applied to one 2×2 and two 3×3 complicated nonlinear multivariable feedback control systems. Considered systems have large transportation lags. Digital simulation verifications give calculated results provide accurate limit cycle predictions of considered systems. Comparisons are made also with other methods in the current literature.
Data Preprocessing Circuit Designs and Analyses for Subsonic Cruise Missile Infrared Image Seeker
Tain-Sou Tsay
The Open Automation and Control Systems Journal , 2008, DOI: 10.2174/1874444300801010014]
Abstract: In this literature, a data pre-processing circuit designs and analyses for an infrared image seeker of a subsonic cruise missile are proposed. The flight speed of the missile is 250m/s. Therefore, automatic contrast control and automatic brightness control are usually needed to keep wanted contrast and brightness for best image properties in target recognition and tracking; especially for the missile at the terminal approaching phase to prevent signal saturation. Signal saturation implies target lost. The major parameters of imaging systems for contrast and brightness controls include average, maximum and minimum of gray level of the whole picture in the sampling interval. Therefore, the overall system is a complicated nonlinear sampled-data control system. It is difficult to describe, analyze and design the system. In this literature, the overall system is first decomposed into two linearized sampled-data control systems to get needed loop compensations, and verified by a special range-dependent testing signal to the overall system secondly. The controlled system is further verified by a thermal plate and real flight testing. Testing results give the proposed method can provide effective way to analyze and design the considered system.
A Structure and Antioxidant Activity Study of Paracetamol and Salicylic Acid  [PDF]
Rosivaldo S. Borges, Tainá G. Barros, Glaécia A. N. Pereira, Jo?o Batista Jr., Raimundo F. G. P. Beleza Filho, Andrex A. S. Veiga, Moisés Hamoy, Vanessa J. Mello, Albérico B. F. da Silva, Carlos A. L. Barros
Pharmacology & Pharmacy (PP) , 2014, DOI: 10.4236/pp.2014.513130
Abstract: The paracetamol has more antioxidant properties than the salicylic acid on the several oxidative stress-forced models and one possible mechanism is due to electron or hydrogen transfer by the evaluated hydroxyl radicals. The antioxidant mechanism for the compounds studied here was performed by molecular modeling using quantum chemical calculations at the B3LYP level of theory. Our results show that the paracetamol has more antioxidant properties than the salicylic acid in experimental and theoretical studies. The theoretical mechanism show that the hydrogen transfer is more favorable than the electron transfer. From the study it was concluded that the electron abstraction for paracetamol is more favored than salicylic acid.
Superconductivity in the orthorhombic phase of thermoelectric CsPbxBi4-xTe6 with 0.3=
R. X. Zhang,H. X. Yang,H. F. Tain,G. F. Chen,S. L. Wu,L. L. Wei,J. Q. Li
Physics , 2015, DOI: 10.1016/j.jssc.2015.08.050
Abstract: Experimental measurements clearly reveal the presence of bulk superconductivity in the CsPbxBi4-xTe6 (0.3=
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