Calculation of the excitation transfer matrix elements between the S2 or S1 state of carotenoid and the S2 or S1 state of bacteriochlorophyll

1993 ◽  
Vol 98 (10) ◽  
pp. 8012-8023 ◽  
Author(s):  
Hiroyoshi Nagae ◽  
Toshiaki Kakitani ◽  
Tetzuya Katoh ◽  
Mamoru Mimuro
Keyword(s):  
Transfer Matrix ◽  
Excitation Transfer ◽  
Matrix Elements

Efficient Calculation of Charge-Transfer Matrix Elements for Hole Transfer in DNA

2008 ◽  
Vol 112 (26) ◽  
pp. 7937-7947 ◽  
Author(s):  
Tomáš Kubař ◽  
P. Benjamin Woiczikowski ◽  
Gianaurelio Cuniberti ◽  
Marcus Elstner
Keyword(s):  
Charge Transfer ◽  
Transfer Matrix ◽  
Matrix Elements ◽  
Hole Transfer ◽  
Efficient Calculation

Evaluation of a Dynamic Transfer Matrix for a Hydraulic Turbine

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Keita Yamamoto ◽  
Koichi Yonezawa ◽  
Andres Müller ◽  
François Avellan ◽  
Yoshinobu Tsujimoto
Keyword(s):  
Transfer Matrix ◽  
Mass Flow ◽  
Excitation Frequency ◽  
Hydraulic Turbine ◽  
Gain Factor ◽  
System Stability ◽  
Dynamical Response ◽  
Matrix Elements ◽  
Full Load ◽  
Hydraulic Machines

Abstract It is well known that hydraulic machines experience various types of flow instabilities causing a negative influence on the system under off-design operations. The transfer matrix method correlating the flow properties in upstream and downstream of hydraulic machines is widely adopted as a first step to investigate dynamical characteristics of flow. Transfer matrix elements are the key to understand hydraulic system stability. This study focuses on measurements of transfer matrix elements for a hydraulic turbine. The oscillations of the flowrate are produced by two flow exciters located in upstream and downstream of the turbine, and evaluated from the fluctuations of the pressure difference across two streamwise locations. It is shown that the transfer matrices are successfully evaluated at part load and full load operations in the presence and absence of cavitation. In particular, cavitation compliance and mass flow gain factor, which determine the dynamical response of cavitation to the change of pressure and flowrate, are calculated from the measured transfer matrix elements. The absolute value of both cavitation compliance and mass flow gain factor is found to increase with respect to the decrease of the cavitation number. The phase of the mass flow gain factor is delayed as the excitation frequency increases. This suggests that hydraulic systems may be stabilized when the oscillation frequency increases. As a result of stability analyses, it is demonstrated that the mass flow gain factor plays a crucial role, especially in the full load cavitation surge.

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