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芦苇秸秆纤维改性及与聚乳酸的共混 被引量:10
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作者 刘旭冉 王洪坤 +1 位作者 吴敏 黄勇 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2021年第1期43-50,共8页
秸秆天然纤维作为填料或增强材料可应用于复合材料领域,但由于其存在大量的亲水基团,与非极性聚合物材料界面相容性差影响着复合材料的性能,因此对植物纤维的化学改性成为改善界面结合的有效手段。文中采用固相力化学法制备马来酸酐酯... 秸秆天然纤维作为填料或增强材料可应用于复合材料领域,但由于其存在大量的亲水基团,与非极性聚合物材料界面相容性差影响着复合材料的性能,因此对植物纤维的化学改性成为改善界面结合的有效手段。文中采用固相力化学法制备马来酸酐酯化改性芦苇秸秆(MA-RS),扫描电镜(SEM)观察到马来酸酐结合外力的作用下秸秆发生解纤,纤维具有较高长径比;同时红外光谱及X射线光电子能谱测试表明,纤维表面马来酸酐基团的取代度随处理时间的延长而逐渐增大。改性秸秆与聚乳酸共混制备得到复合材料,由于马来酸酐的接枝改变秸秆纤维表面性质,提高了秸秆纤维与聚乳酸之间的相容性和界面结合力。力学测试结果表明,拉伸强度提高约16%,冲击强度提高约30%;SEM观察断面形貌表面,改性秸秆比未改性秸秆与PLA基体具有更好的界面相容性。 展开更多
关键词 秸秆纤维 聚乳酸 酯化改性 马来酸酐 力化学法
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E-Bayesian estimation for competing risk model under progressively hybrid censoring 被引量:3
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作者 min wu Yimin Shi Yan Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2016年第4期936-944,共9页
This paper considers the Bayesian and expected Bayesian(E-Bayesian) estimations of the parameter and reliability function for competing risk model from Gompertz distribution under Type-I progressively hybrid censori... This paper considers the Bayesian and expected Bayesian(E-Bayesian) estimations of the parameter and reliability function for competing risk model from Gompertz distribution under Type-I progressively hybrid censoring scheme(PHCS). The estimations are obtained based on Gamma conjugate prior for the parameter under squared error(SE) and Linex loss functions. The simulation results are provided for the comparison purpose and one data set is analyzed. 展开更多
关键词 Bayesian estimation expected Bayesian(E-Bayesian) estimation Gompertz distribution Type-I progressively hybrid censoring
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DECENTRALIZED H_∞ SUBOPTIMAL DESIGN:AN LMI APPROACH
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作者 Weihua Gui Yongfang Xie +1 位作者 Ning Chen min wu 《Journal of Central South University》 SCIE EI CAS 1999年第1期64-67,共4页
Address the design of state feedback H ∞ suboptimal controllers. Through parameterization of decentralized controllers, the design condition for the feedback gain is given in the form of a biaffine matrix inequali... Address the design of state feedback H ∞ suboptimal controllers. Through parameterization of decentralized controllers, the design condition for the feedback gain is given in the form of a biaffine matrix inequality. An iterative algorithm based on linear matrix inequality(LMI) is proposed to obtain the decentralized controller which ensures the closed loop system asymptotically stable and the H ∞ norm less than constant number 1. 展开更多
关键词 DECENTRALIZED robust control state FEEDBACK linear MATRIX INEQUALITIES ITERATIVE algorithm
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