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您的检索式：作者名="Haider Zaman"
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| 1 | Emergency off-pump coronary artery surgery显示文摘Background Off-pump coronary artery bypass grafting is fast-becoming a procedure of choice for elective revascularization in high-risk patients with multi-vessel coronary artery disease. However,the role of off-pump coronary artery bypass grafting for patients with acute coronary syndromes requiring emergency revascularization still requires validation. We present our experience to show the feasibility of off-pump coronary artery surgery as an emergency revascularization technique. Methods From April 2001 to September 2003,emergency (operation within 24 hours after hospitalization) coronary artery bypass grafting without cardiopulmonary bypass (CPB) was performed in 66 patients with a mean age of (66.9±5.4) years (range 49-72 years). They presented acute coronary syndromes with 38 patients on platelet glycoprotein Ⅱb/Ⅲa receptor antagonists. All patients underwent off-pump coronary artery bypass surgery via sternotomy with the intention of complete coronary revascularization.Results An average of 2.9 grafts per patient were performed and the posterior descending artery and marginal branches of the circumflex artery were grafted in 83.3% of the patients. There were 4 events of intraoperative cardiac instability, precipitated by occlusion of right coronary artery or positioning of a cardiomegaly heart,leading to immediate conversion to CPB. The mortality rate was 3% (2/66). Two patients suffered postoperative stroke while three needed hemofiltration for acute renal failure. Post surgery elective coronary angiography (n=46) showed no significant stenosis.Conclusion Emergency off-pump coronary artery surgery with complete revascularization is feasible in patients with acute coronary syndrome with low morbidity and mortality and excellent early results. | Shahzad G Raja Zulfiqar Haider Haider Zaman | 2004 | Chinese Medical Journal2004，，6： | 1 |
| 2 | A Fractional Order Fast Repetitive Control Paradigm of Vienna Rectifier for Power Quality Improvement显示文摘Due to attractive features,including high efficiency,low device stress,and ability to boost voltage,a Vienna rectifier is commonly employed as a battery charger in an electric vehicle(EV).However,the 6k±1 harmonics in the acside current of the Vienna rectifier deteriorate theTHDof the ac current,thus lowering the power factor.Therefore,the current closed-loop for suppressing 6k±1 harmonics is essential tomeet the desired total harmonic distortion(THD).Fast repetitive control(FRC)is generally adopted;however,the deviation of power grid frequency causes delay link in the six frequency fast repetitive control to become non-integer and the tracking performance to deteriorate.This paper presents the detailed parameter design and calculation of fractional order fast repetitive controller(FOFRC)for the non-integer delay link.The finite polynomial approximates the non-integer delay link through the Lagrange interpolation method.By comparing the frequency characteristics of traditional repetitive control,the effectiveness of the FOFRC strategy is verified.Finally,simulation and experiment validate the steadystate performance and harmonics suppression ability of FOFRC. | Sue Wang Xintao Luo Saleem Riaz Haider Zaman Chaohong Zhou Pengfei Hao | 2023 | Computer Modeling in Engineering & Sciences2023，，2： | 0 |
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