scholarly journals Cable vibration caused by wind

2018 ◽  
Vol 180 ◽  
pp. 02031
Author(s):  
Irena Golebiowska ◽  
Kazimierz Peszynski
Keyword(s):  
Energy Dissipation ◽  
Excitation Energy ◽  
Large Amplitude ◽  
Dynamic Effect ◽  
Internal Damping ◽  
Paper Briefly ◽  
Cable Vibration ◽  
Low Weight ◽  
Total Excitation Energy ◽  
Excessive Stress

The paper briefly presents selected basic kinds of excitation of cable vibration caused by dynamic effect of wind. It describes the aerodynamic phenomena such as vortex excitation, wind-rain excitation, galloping and buffeting. Cables are structures which are characterised by low internal damping, low rigidity and low weight, so they are not capable of total excitation energy dissipation, hence they can reach large amplitudes of vibration. Large amplitude of vibration causes excessive stress, thereby lowering the safety of the structure.

ENERGY PARTITION IN 235U FISSION REACTION INDUCED BY THERMAL NEUTRON

2012 ◽  
Vol 21 (08) ◽  
pp. 1250073 ◽  
Author(s):  
YONG-JING CHEN ◽  
JING QIAN ◽  
TING-JIN LIU ◽  
ZHU-XIA LI ◽  
XI-ZHEN WU ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Heavy Fragment ◽  
Incident Neutron ◽  
Shell Effect ◽  
Incident Neutron Energy ◽  
Energy Partition ◽  
Fission Reaction ◽  
Fission Fragments ◽  
Total Excitation Energy ◽  
235U Fission

The partition of the total excitation energy between the fission fragments for the n th +235 U and n(En = 5.55 MeV)+235 U fission reactions are analyzed with the experimental data available. Our results show that the total excitation energy is not shared by the fragments in proportion of their masses but support the so-called energy sorting-mechanism. The temperature of the heavy fragment is generally lower than that of the light one when the shell effect does not play a strong role. As soon as the mass of heavy fragment closes to 132, its temperature becomes higher than the complementary light one because of strong shell effect. Our results also show that the heavy fragments gain more energy than the complementary light ones when the incident neutron energy increases.

Xanthophyll cycle, light energy dissipation and photosystem II down-regulation in senescent leaves of wheat plants grown in the field

2001 ◽  
Vol 28 (10) ◽  
pp. 1023 ◽  
Author(s):  
Congming Lu ◽  
Qingtao Lu ◽  
Jianhua Zhang ◽  
Qide Zhang ◽  
Tingyun Kuang
Keyword(s):  
Energy Dissipation ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Xanthophyll Cycle ◽  
Light Energy ◽  
Photochemical Quenching ◽  
Down Regulation ◽  
Psii Efficiency ◽  
Psii Photochemistry ◽  
Assimilation Capacity

Photosynthesis, the xanthophyll cycle, light energy dissipation and down-regulation of photosystem II (PSII) in senescent leaves of wheat plants grown in the field were investigated. With the progress of senescence, maximal efficiency of PSII photochemistry decreased only slightly early in the morning but substantially at midday. Actual PSII efficiency, photochemical quenching, efficiency of excitation capture by open PSII centres, and the I–P phase of fluorescence induction curves decreased significantly and such decreases were much more evident at midday than in the morning. At the same time, non-photochemical quenching, thermal dissipation and de-epoxidation status of the xanthophyll cycle increased, with much greater increases at midday than in the morning. These results suggest that the xanthophyll cycle played a role in photoprotection of PSII in senescent leaves by dissipating excess excitation energy. Taking into account the substantial decrease in photosynthetic capacity in senescent leaves, our data seem to support the view that the decrease in actual PSII efficiency in senescent leaves may represent a mechanism to down-regulate photosynthetic electron transport to match the decreased CO2 assimilation capacity and avoid photodamage of PSII from excess excitation energy.

scholarly journals Changes in Photo-Protective Energy Dissipation of Photosystem II in Response to Beneficial Bacteria Consortium in Durum Wheat under Drought and Salinity Stresses

2020 ◽  
Vol 10 (15) ◽  
pp. 5031 ◽  
Author(s):  
Mohammad Yaghoubi Khanghahi ◽  
Sabrina Strafella ◽  
Carmine Crecchio
Keyword(s):  
Chlorophyll Fluorescence ◽  
Energy Dissipation ◽  
Quantum Yield ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Durum Wheat ◽  
Photochemical Quenching ◽  
Plant Growth Promoting Bacteria ◽  
Psii Photochemistry ◽  
Non Photochemical Quenching

The present research aimed at evaluating the harmless dissipation of excess excitation energy by durum wheat (Triticum durum Desf.) leaves in response to the application of a bacterial consortium consisting of four plant growth-promoting bacteria (PGPB). Three pot experiments were carried out under non-stress, drought (at 40% field capacity), and salinity (150 mM NaCl) conditions. The results showed that drought and salinity affected photo-protective energy dissipation of photosystem II (PSII) increasing the rate of non-photochemical chlorophyll fluorescence quenching (NPQ (non-photochemical quenching) and qCN (complete non-photochemical quenching)), as well as decreasing the total quenching of chlorophyll fluorescence (qTQ), total quenching of variable chlorophyll fluorescence (qTV) and the ratio of the quantum yield of actual PSII photochemistry, in light-adapted state to the quantum yield of the constitutive non-regulatory NPQ (PQ rate). Our results also indicated that the PGPB inoculants can mitigate the adverse impacts of stresses on leaves, especially the saline one, in comparison with the non-fertilized (control) treatment, by increasing the fraction of light absorbed by the PSII antenna, PQ ratio, qTQ, and qTV. In the light of findings, our beneficial bacterial strains showed the potential in reducing reliance on traditional chemical fertilizers, in particular in saline soil, by improving the grain yield and regulating the amount of excitation energy.

A Flexible LHCII Structure Allows for Fine-Tuning of Excitation Energy Dissipation

2020 ◽  
Author(s):  
Francesco Saccon ◽  
Milan Durchan ◽  
David Bína ◽  
Christopher Duffy ◽  
Alexander V. Ruban ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Excitation Energy ◽  
Fine Tuning

Possible reference method of total excitation energy partition between complementary fission fragments

2011 ◽  
Vol 867 (1) ◽  
pp. 12-40 ◽  
Author(s):  
C. Manailescu ◽  
A. Tudora ◽  
F.-J. Hambsch ◽  
C. Morariu ◽  
S. Oberstedt
Keyword(s):  
Excitation Energy ◽  
Reference Method ◽  
Energy Partition ◽  
Fission Fragments ◽  
Total Excitation Energy

Terrestrial Heat Flow Studies: History of Knowledge and Principal Achievements

2007 ◽  
Vol 26 (2) ◽  
pp. 301-319
Author(s):  
Vladimír Cermák
Keyword(s):  
Energy Dissipation ◽  
Heat Flow ◽  
International Cooperation ◽  
Heat Loss ◽  
Plate Tectonics ◽  
Internal Heat ◽  
Volcanic Eruptions ◽  
Paper Briefly ◽  
History Of ◽  
Internal Constitution

The outflow of heat from the Earth's interior is, energy-wise, the most impressive terrestrial phenomenon. Its rate of about 1021 joules per year is order of magnitudes greater than the heat loss from volcanic eruptions or energy dissipation of earthquakes. The study of the Earth's internal heat plays an important role in understanding the Earth's origin, its evolution, internal constitution, and plate tectonics. The paper briefly recalls the early days of geothermal understanding of our planet, lists the principal milestones of heat flow studies and reviews the major achievements of the international cooperation under the activities of the International Heat Flow Commission of the IASPEI.

scholarly journals Photosynthesis impairments and excitation energy dissipation on wheat plants supplied with silicon and infected with Pyricularia oryzae

2017 ◽  
Vol 121 ◽  
pp. 196-205 ◽  
Author(s):  
Carlos Eduardo Aucique-Pérez ◽  
Paulo Eduardo de Menezes Silva ◽  
Wiler Ribas Moreira ◽  
Fábio Murilo DaMatta ◽  
Fabrício Ávila Rodrigues
Keyword(s):  
Energy Dissipation ◽  
Excitation Energy ◽  
Pyricularia Oryzae

The limiting total excitation energy of the nucleus and Levinson's theorem

1988 ◽  
Vol 14 (4) ◽  
pp. L61-L65
Author(s):  
F A Almeida ◽  
Y T Chen ◽  
M S Hussein ◽  
R Donangelo
Keyword(s):  
Excitation Energy ◽  
Levinson’S Theorem ◽  
Total Excitation Energy
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