http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Ali Sadaqat (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Ali Sadaqat,Haider Shafiq,Huda Aamina Bintul,Hadi Hussain,Ammar Khawaja 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
In this manuscript, various balanced-truncation methods for limited frequency interval model order reduction applications of unstable second order systems (SOSs) are considered. Limited interval gramians are computed by solving the proposed algebraic Lyapunov equations (CALEs). Reduced order model (ROM) performance is optimized in required interval of frequency. It is observed that CALEs for unstable-SOSs become unsolvable and thus halt the reduction-procedure. To bridle this restraint, in first proposed method, fragmentation of continuous time unstable SOS in to stable and unstable segments is performed and ROM for stable part is computed. ROM thus acquired for stable segment is appended with unstable segment to obtain the reduced model in total. However, SOS-structure in ROM obtained from first proposed method gets lost and appended unstable part degrade ROM integrity. To avert these restraints, in later part, structure preserving approaches for unstable SOSs are presented. In structure preserving technique, system is made stable using Bernoulli feedback and gramians are calculated by solving frequency-limited CALEs. The resultant gramians are partitioned in to position and velocity portions in order to achieve structure-preservation so that interpretation of original-system is retained. The partitioned gramians are balanced with different combinations to achieve various second order balancing procedures that provide ROM with optimized performance in required frequency-interval. The comparison of proposed frequency-limited and infinite interval procedures is performed to prove the superiority of proposed procedures for multiple systems. The proposed development can be utilized for ROM performance optimization applications in limited-frequency interval for unstable-SOSs.
-
Preparation of graphene-coated anodic alumina substrates for selective molecular transport
Akhtar Sultan,Ali Sadaqat,Kafiah Feras M.,Ibrahim Ahmed,Matin Asif,Laoui Tahar 한국탄소학회 2020 Carbon Letters Vol.30 No.1
In this paper, we report graphene composite membranes prepared by transfer of a layer of chemical vapor deposition graphene onto porous anodic alumina (AA) substrates with nominal pore size 20 and 30 nm, referred as 20AA and 30AA. The coated and uncoated substrates were characterized using optical and electron microscopy techniques. The bare substrates exhibited a smooth surfaces with a well-organized array of hexagonal pores, displaying an average pore size of 17±3 (20AA) and 23±3 nm (30AA). The scanning electron microscopy and atomic force microscopy analyses confrmed the successful transfer of graphene layer onto the target substrates. The molecular transport study was performed by introducing 0.5 M potassium chloride (KCl) and deionized water in a Side-bi-Side Franz difusion cell. The graphene/20AA specimen blocked 66% ions transport, and graphene/30AA membrane about 64%. The ions blockage exceeded 90%, near the characteristics of defect�free graphene when the defects of the transferred graphene were sealed with Nylon 6,6. The results of this study suggest the potential use of graphene on AA substrates for water desalination and gas purifcation applications.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
