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Photosynthesis and Water-Use Efficiency of Some Mangroves from Sundarbans, India
Nandy, Paramita,Ghose, Monoranjan 한국식물학회 2001 Journal of Plant Biology Vol.44 No.4
We studied seasonal fluctuations in the rates of photosynthesis, transpiration, PAR, and stomatal conductance for 16 species of true mangroves from the Sundarbans region of West Bengal. Soil salinity and pH were also measured. Leaf temperatures were almost always higher than the ambient temperature. We observed considerable seasonal (summer vs winter) as well as interspecific variations in photosynthesis, with the highest rates occurring in Heritiera fomes (13.21μ㏖ m^-2 s^-1) and Avicennia marina (11.8μ㏖ m^-2 s^-1), and the lowest in Nypa fruticans (1.56μ㏖ m^-2 s^-1) and Ceriops decandra (2.32μ㏖ m^-2 s^-1). In many species, an abrupt rise in leaf temperature retarded the photosynthetic process. In winter, the rate of transpiration and stomatal conductance reached their maxima in A. marina (4.83m㏖ m^-2 s^-1 and 124.23 m㏖ m^-2 s^-1, respectively) and their mimima in Excoecaria agallocha (1.85m㏖ m^-2 s^-1 and 49.19m㏖ m^-2 s^-1, respectively). In contrast, the maximum summer readings were recorded in E. agallocha (6.07m㏖ m^-2 s^-1 and 192.74m㏖ m^-2 s^-1 respectively).
Iwan Setyawan,Nandy Putra,Imansyah Ibnu Hakim,Ridho Irwansyah 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
Loop heat pipe (LHP) is an effective two-phase heat transfer device that utilizes evaporation and condensation of a working fluid. LHP is widely used in a passive cooling system, highly reliable and a very high thermal conductive device. However, extreme power density can cause dry-out in the evaporator section of LHP and might hinder the performance of the cooling system. The purpose of this research is to design and manufacture a new prototype of LHP by modifying the conventional LHP. The modification was performed by adding a diaphragm pump, called hybrid loop heat pipe (HLHP). The experimental results show that the installation of pumps in the modified LHP was able to prevent the occurrence of a dry out and reduce the operating temperature. Under a constant conductance mode, the pump was activated for 20 minutes and succeded in forcing the system to a new stable condition with a significant temperature drop. These results indicate that HLHP is very promising as a two-phase cooling system that can be proposed for devices that produce high heat flux.