Does the temperature response of rest break of woody plants change during the development?

1988 ◽  
Vol 18 (2) ◽  
pp. 269-271 ◽  
Author(s):  
Heikki Hänninen ◽  
Paavo Pelkonen
Keyword(s):  
Ambient Temperature ◽  
Preliminary Data ◽  
Woody Plants ◽  
Temperature Response ◽  
Breaking Effect ◽  
Temperature Conditions ◽  
Rest Break ◽  
Breaking Mechanism

Preliminary data concerning rest break of buds of 2-year-old seedlings of Pinussylvestris L. and Piceaabies (L.) Karst suggested that (i) an ambient, temperature of 12 °C has a slight rest breaking effect, and (ii) the ability of the rest breaking mechanism to respond to 12 °C is gradually lost when the seedlings are first chilled near 0 °C. This change in the response is interpreted to represent the acclimation of the seedlings to prevailing temperature conditions. A very long forcing period is required to obtain the pattern found by us.

Does the temperature response of rest break of woody plants change during the development?

1988 ◽  
Vol 18 (9) ◽  
pp. 1214-1214
Author(s):  
Heikki Hänninen ◽  
Paavo Pelkonen
Keyword(s):  
Woody Plants ◽  
Temperature Response ◽  
Rest Break

not available

Design and Fabrication of a Magnetocaloric Microcooler

2005 ◽  
Author(s):  
Sangchae Kim ◽  
Bharath Bethala ◽  
Simone Ghirlanda ◽  
Senthil N. Sambandam ◽  
Shekhar Bhansali
Keyword(s):  
Magnetic Field ◽  
Ambient Temperature ◽  
Temperature Change ◽  
Entropy Change ◽  
Temperature Sensors ◽  
Experimental Results ◽  
Maximum Temperature ◽  
Alternative Technology ◽  
Temperature Conditions ◽  
Si Wafer

Magnetocaloric refrigeration is increasingly being explored as an alternative technology for cooling. This paper presents the design and fabrication of a micromachined magnetocaloric cooler. The cooler consists of fluidic microchannels (in a Si wafer), diffused temperature sensors, and a Gd5(Si2Ge2) magnetocaloric refrigeration element. A magnetic field of 1.5 T is applied using an electromagnet to change the entropy of the magnetocaloric element for different ambient temperature conditions ranging from 258 K to 280 K, and the results are discussed. The tests show a maximum temperature change of 7 K on the magnetocaloric element at 258 K. The experimental results co-relate well with the entropy change of the material.

Study on Rock-Breaking Simulation and Experiment of Double Disc Cutter of TBM

2016 ◽  
Vol 23 ◽  
pp. 80-88
Author(s):  
F. Lu ◽  
C. Zhang ◽  
J. Sun ◽  
J.X. Tian ◽  
M. Liu ◽  
...  
Keyword(s):  
Rock Breaking ◽  
Disc Cutter ◽  
Element Analysis ◽  
Breaking Effect ◽  
The Finite Element Analysis ◽  
Breaking Mechanism ◽  
Simulation And Experiment ◽  
Tbm Cutter ◽  
Cutter Spacing ◽  
The Impact

In order to improve working efficiency of the tunneling process and extend working life of disc cutter, explore the impact of cutter spacing and loading for the cutter rock-breaking effect. With the theory of rock crushing, Based on the finite element analysis software ABAQUS, the process of disc cutter breaking rock is simulated, considering the adjacent cutters sequential constraints, then, to make sure two cutter space with the method of SE in experiment.The simulation results showed that the optimal cutter spacings were both about 80mm in the same loading and the sequentially loading, but the rock-breaking effect of sequentially loading is better than the same loading. The experimental data showed that the minimum specific energy of rock breaking is appeared cutter spacing between 80mm and 90mm. Thus, the correctness and rationality of the simulation was verified. The study is good for understanding the rock-breaking mechanism of double disc cutter and has a certain promoting value to optimize TBM cutter system.Keywords:TBM, rock fragmentation, ABAQUS, cutter spacing, sequentially cutting

Analysis of Micro-Explosion Phenomenon in a Constant Volume Chamber by Butanol-Biodiesel-Diesel Blend Fuel

2012 ◽  
Vol 443-444 ◽  
pp. 996-1006 ◽  
Author(s):  
Yu Liu ◽  
Jun Li ◽  
Ying Gao ◽  
Xin Mei Yuan
Keyword(s):  
Ambient Temperature ◽  
High Speed ◽  
Fuel Injection ◽  
Combustion Process ◽  
Constant Volume ◽  
Liquid Jet ◽  
Penetration Length ◽  
Temperature Conditions ◽  
Constant Volume Chamber ◽  
Jet Penetration

Different blend ratio of ternary component fuel was tested inside a constant volume chamber to investigate fuel injection and combustion under similar real engine working conditions. Because liquid spray light scattering is the different reflective rate from the liquid droplets and its surrounding background, butanol-biodiesel-diesel liquid jet penetration length can be highlighted in the images taken by high speed camera. Various ambient temperatures from 800K to 1200K and fuel composition were investigated. Measured results showed that sudden but repeatable drop of liquid jet penetration length at constant ambient temperature conditions of 800K and 900K. With ambient temperature increasing, this phenomenon became weak and disappeared. So more works focus on non-combusting experiments in order to delete combustion reflect. With butanol and biodiesel content increasing, micro explosion becomes prone excited and more violent because of the enlarged differences in volatilities and boiling point among the components. It is concluded that micro explosion which will distinctly enhances premixed combustion process and heat release rate but it present under certain initial ambient temperature conditions only and the light fuel content shouldn’t be lower than 10%.

scholarly journals Ambient Temperature-Responsive Mechanisms Coordinate Regulation of Flowering Time

2018 ◽  
Vol 19 (10) ◽  
pp. 3196 ◽  
Author(s):  
Hendry Susila ◽  
Zeeshan Nasim ◽  
Ji Ahn
Keyword(s):  
Ambient Temperature ◽  
Flowering Time ◽  
Molecular Mechanisms ◽  
Protein Localization ◽  
Temperature Response ◽  
Histone Variants ◽  
Temperature Sensing ◽  
Future Research ◽  
Temperature Perception ◽  
Local Climate

In plants, environmental conditions such as temperature affect survival, growth, and fitness, particularly during key stages such as seedling growth and reproduction. To survive and thrive in changing conditions, plants have evolved adaptive responses that tightly regulate developmental processes such as hypocotyl elongation and flowering time in response to environmental temperature changes. Increases in temperature, coupled with increasing fluctuations in local climate and weather, severely affect our agricultural systems; therefore, understanding the mechanisms by which plants perceive and respond to temperature is critical for agricultural sustainability. In this review, we summarize recent findings on the molecular mechanisms of ambient temperature perception as well as possible temperature sensing components in plants. Based on recent publications, we highlight several temperature response mechanisms, including the deposition and eviction of histone variants, DNA methylation, alternative splicing, protein degradation, and protein localization. We discuss roles of each proposed temperature-sensing mechanism that affects plant development, with an emphasis on flowering time. Studies of plant ambient temperature responses are advancing rapidly, and this review provides insights for future research aimed at understanding the mechanisms of temperature perception and responses in plants.

Seawater based mixed methane-THF hydrate formation at ambient temperature conditions

2020 ◽  
Vol 271 ◽  
pp. 115158
Author(s):  
Gaurav Bhattacharjee ◽  
Hari Prakash Veluswamy ◽  
Rajnish Kumar ◽  
Praveen Linga
Keyword(s):  
Ambient Temperature ◽  
Hydrate Formation ◽  
Temperature Conditions

scholarly journals Ultrafast amidation of esters using lithium amides under aerobic ambient temperature conditions in sustainable solvents

2020 ◽  
Vol 11 (25) ◽  
pp. 6500-6509 ◽  
Author(s):  
Michael Fairley ◽  
Leonie J. Bole ◽  
Florian F. Mulks ◽  
Laura Main ◽  
Alan R. Kennedy ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Organometallic Chemistry ◽  
Room Temperature ◽  
Temperature Conditions ◽  
Lithium Amides ◽  
Sustainable Solvents

Using 2-methyl THF as solvent enables efficient and ultrafast amidation of esters by lithium amides at room temperature in air, edging closer towards reaching air- and moisture-compatible polar organometallic chemistry.

Failure Investigation of Cold-Rolled ZnTiCu Alloy Fracture During Bending Under Ambient Temperature Conditions

2013 ◽  
Vol 13 (6) ◽  
pp. 757-764 ◽  
Author(s):  
George Pantazopoulos ◽  
Athanasios Vazdirvanidis ◽  
Andreas Rikos ◽  
Anagnostis Toulfatzis
Keyword(s):  
Ambient Temperature ◽  
Temperature Conditions ◽  
Failure Investigation ◽  
Cold Rolled

scholarly journals Exploiting Deep Eutectic Solvents and Organolithium Reagent Partnerships: Chemoselective Ultrafast Addition to Imines and Quinolines Under Aerobic Ambient Temperature Conditions

2016 ◽  
Vol 128 (52) ◽  
pp. 16379-16382 ◽  
Author(s):  
Cristian Vidal ◽  
Joaquín García-Álvarez ◽  
Alberto Hernán-Gómez ◽  
Alan R. Kennedy ◽  
Eva Hevia
Keyword(s):  
Ambient Temperature ◽  
Deep Eutectic Solvents ◽  
Temperature Conditions ◽  
Organolithium Reagent

scholarly journals Effect of hatching date, vertical distribution, and interannual variation in physical forcing on northward displacement and temperature conditions of Norwegian spring-spawning herring larvae

2010 ◽  
Vol 67 (9) ◽  
pp. 1948-1956 ◽  
Author(s):  
Frode B. Vikebø ◽  
Åse Husebø ◽  
Aril Slotte ◽  
Erling Kåre Stenevik ◽  
Vidar S. Lien
Keyword(s):  
Vertical Distribution ◽  
Ambient Temperature ◽  
Interannual Variation ◽  
Barents Sea ◽  
Clupea Harengus ◽  
Coastal Current ◽  
Hatching Date ◽  
Physical Forcing ◽  
Larval Drift ◽  
Temperature Conditions

Abstract Vikebø, F. B., Husebø, Å., Slotte, A., Stenevik, E. K., and Lien, V. S. 2010. Effect of hatching date, vertical distribution, and interannual variation in physical forcing on northward displacement and temperature conditions of Norwegian spring-spawning herring larvae. – ICES Journal of Marine Science, 67: 1948–1956. Early hatching has been shown to be associated with increased survival of Norwegian spring-spawning herring (Clupea harengus) larvae. We investigated whether the process behind this association is related to larval drift and ambient temperature. A three-dimensional hydrodynamic model was used to simulate the effect of hatching date on northward displacement and temperature conditions of larvae from spawning grounds off western Norway for 1989–2008. The simulations revealed that the displacement during a period of 60 d was greatest if the larvae hatched early in the season and if they were located near the surface. The relationship between drift speed and ambient temperature was significantly negative, but less so later in the season, because the coastal current became progressively warmer. Results from the simulated interannual variations in larval drift compared with the observed survival suggest that a rapid northward displacement to the main nursery area in the Barents Sea is more important for larval survival than ambient temperature. The significant effect of northward displacement on survival could be explained by reduced overlap with predators and/or higher prey densities, but the causal processes involved remain to be investigated.

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