Heat dissipation during long-term anoxia inArtemia franciscana embryos: identification and fate of metabolic fuels

1990 ◽  
Vol 160 (4) ◽  
pp. 357-363 ◽  
Author(s):  
Steven C. Hand
Keyword(s):  
Heat Dissipation

Long-Term Evolution of SCD-1 Satellite Temperatures Based on Comparative Analysis of Telemetric Data Measured in Orbit

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Andreia F. S. Genaro ◽  
Ezio C. Garcia ◽  
Issamu Muraoka ◽  
Kevin E. de Conde
Keyword(s):  
Mathematical Model ◽  
Thermal Behavior ◽  
Heat Dissipation ◽  
Solar Spectrum ◽  
Temperature Sensitive ◽  
Term Evolution ◽  
Optimization Routine ◽  
Experimental Values ◽  
The Mathematical Model

This paper presents results of the research investigation regarding the causes for temperature variation of the SCD-1 (data-collection satellite) by analyzing its thermal behavior evolution throughout 13 years in orbit. SCD-1, the first satellite designed and built in Brazil, was launched in 1993 and is still in operation. A mathematical model has been developed to simulate thermal behavior of SCD-1 in orbit, which was used as a working tool during project design phase, and is presented here. Temperatures of SCD-1 in orbit have been monitored and recorded in the Control and Tracking Center (São José dos Campos, SP, Brazil) since its launch. An analysis carried out at the mission’s beginning showed that all the temperatures were within the ranges predicted in model. Over the years, the battery, which is the most temperature-sensitive equipment in the satellite, had an increase in temperature approaching upper limit. A method has been developed to investigate the causes of this upswing in which an optimization routine linked to the mathematical model corrects a selected set of parameters in order to adjust the theoretical temperature values to the experimental values. By means of this methodology, data from SCD-1 were analyzed from 1995 to 2005 period and it was concluded that the rise in temperature was caused by an increase in internal battery heat dissipation and absorptivity in solar spectrum of some of the external satellite shielding, both consequences of a long-term degradation.

scholarly journals Polyphasic OKJIP Chlorophyll a Fluorescence Transient in a Landrace and a Commercial Cultivar of Sweet Pepper (Capsicum annuum, L.) under Long-Term Salt Stress

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 887
Author(s):  
Pasquale Giorio ◽  
Mohamed Houssemeddine Sellami
Keyword(s):  
Salt Stress ◽  
Quantum Yield ◽  
Heat Dissipation ◽  
Sweet Pepper ◽  
Oxygen Evolving Complex ◽  
Maximum Quantum Yield ◽  
Commercial Cultivar ◽  
Oxygen Evolving ◽  
Quantum Yield Of Psii

In a soilless long-term salt-stress experiment, we tested the differences between the commercial sweet pepper cultivar “Quadrato d’Asti” and the landrace “Cazzone Giallo” in the structure and function of PSII through the JIP test analysis of the fast chlorophyll fluorescence transients (OKJIP). Salt stress inactivated the oxygen-evolving complex. Performance index detected the stress earlier than the maximum quantum yield of PSII, which remarkably decreased in the long term. The detrimental effects of salinity on the oxygen evolving-complex, the trapping of light energy in PSII, and delivering in the electron transport chain occurred earlier and more in the landrace than the cultivar. Performance indexes decreased earlier than the maximum quantum yield of PSII. Stress-induced inactivation of PSII reaction centers reached 22% in the cultivar and 45% in the landrace. The resulted heat dissipation had the trade-off of a correspondent reduced energy flow per sample leaf area, thus an impaired potential carbon fixation. These results corroborate the reported higher tolerance to salt stress of the commercial cultivar than the landrace in terms of yield. PSII was more affected than PSI, which functionality recovered in the late of trial, especially in the cultivar, possibly due to heat dissipation mechanisms. This study gives valuable information for breeding programs aiming to improve tolerance in salt stress sensitive sweet pepper genotypes.

Study and Design of a Heat Dissipation System in a Junction Box for Chinese Experimental Ocean Observatory Network

2016 ◽  
Vol 50 (2) ◽  
pp. 63-74 ◽  
Author(s):  
Dejun Li ◽  
Jun Wang ◽  
Jianshe Feng ◽  
Canjun Yang ◽  
Yanhu Chen
Keyword(s):  
Temperature Field ◽  
Heat Dissipation ◽  
Thermal Contact ◽  
Heat Sinks ◽  
Maximum Temperature ◽  
Laboratory Setup ◽  
Temperature Field Model ◽  
Cooling Mechanism ◽  
Dissipation System

AbstractGood heat dissipation is highly significant for long-term reliable functioning of a junction box (JB) for a cable ocean observatory network. An innovative heat dissipation system consisting of circumferentially equi-spaced chassis heat sinks and an adaptive elastic support structure is proposed based on the analysis of the cooling mechanism of the JB. A temperature field model of the JB is established. The parameters include seawater pressure, precision of machine workpieces, seawater flow rate, and thermal contact resistance. A 3D dynamic simulation of heat dissipation is conducted using the commercial software ANSYS to describe the temperature field inside the JB. The proposed heat dissipation system is applied and tested on a laboratory setup of the Experimental Underwater Observatory Network System of China. Experimental results agree well with the theoretical model and simulated results. The increase in maximum temperature in the JB is between 7°C and 10°C under different sea conditions.

Design and Application of a Junction Box for Cabled Ocean Observatories

2012 ◽  
Vol 46 (3) ◽  
pp. 50-63 ◽  
Author(s):  
Yanhu Chen ◽  
Canjun Yang ◽  
Dejun Li ◽  
Bo Jin ◽  
Ying Chen
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Heat Dissipation ◽  
High Reliability ◽  
Monterey Bay ◽  
Power Distribution System ◽  
Sea Trial ◽  
Ground Fault ◽  
Self Protection

AbstractCabled ocean observatories enabling large amounts of power and two-way communication bandwidth for underwater experiments are a future approach for studying the oceans. On April 21, 2011, at Monterey Bay, California, USA, a network node composed of a junction box (JBox) and three scientific instruments was deployed at the Monterey Accelerated Research System (MARS) site for a 6-month uninterrupted sea trial. The JBox is a facility that can provide multiple wet-mateable connections for various instruments. Each connection can draw 500 W of power and has 10/100 Mbit/s network communication. The current study presents the design and construction of the JBox with focus on the following aspects: a power distribution system with high reliability; a flexible springloaded mechanical structure for heat dissipation; communication that incorporates various data protocols; and self-protection against faults like over-current, short fault, ground fault, and flooding. The deployment and operation of the JBox is described. The sea trial results show that the technologies and methods applied on the JBox and the deploying approach are applicable and worthy of consideration for long-term cabled ocean observatories.

Experimental Study on Natural Convection From Vertical Cylinders With Branched Fins

2013 ◽  
Author(s):  
Kuen Tae Park ◽  
Byeongdong Kang ◽  
Hyun Jung Kim ◽  
Dong-Kwon Kim
Keyword(s):  
Natural Convection ◽  
Heat Dissipation ◽  
Electronic Devices ◽  
Heat Sinks ◽  
Electronic Systems ◽  
Electronic Components ◽  
Cooling Systems ◽  
Cooling Technology ◽  
Vertical Cylinders

Advances in semiconductor technology and trends in slim and light electronic systems have led to a significant increase in heat dissipation density of the electronic devices. Therefore, effective cooling technology is essential for reliable operation of electronic components. Among various cooling systems, natural convection heat sinks have been proven to be appropriate because of their inherent simplicity, reliability, and low long-term cost. The present study is focused on natural convective heat transfer from the cylindrical heat sink. Especially, the branched fins, which are motivated by the branched design of nature shown in trees and lungs, are used. The heating power and surface temperature are measured for various types of branched fins and numbers of fins. The result showed that the branched fin dissipates 20% more heat compared to the normal plate fins. Therefore, heat sinks with branched fins have a potential as a next-generation cooling device.

Therapy and prevention for mental health: What if mental diseases are mostly not brain disorders?

2019 ◽  
Vol 42 ◽  
Author(s):  
John P. A. Ioannidis
Keyword(s):  
Mental Health ◽  
Mental Disease ◽  
Brain Disorders ◽  
Social Stressors ◽  
Labor Education ◽  
Mental Diseases ◽  
Long Term Follow Up ◽  
Political Decisions

AbstractNeurobiology-based interventions for mental diseases and searches for useful biomarkers of treatment response have largely failed. Clinical trials should assess interventions related to environmental and social stressors, with long-term follow-up; social rather than biological endpoints; personalized outcomes; and suitable cluster, adaptive, and n-of-1 designs. Labor, education, financial, and other social/political decisions should be evaluated for their impacts on mental disease.

Conceptual short-term memory (CSTM) supports core claims of Christiansen and Chater

2016 ◽  
Vol 39 ◽  
Author(s):  
Mary C. Potter
Keyword(s):  
Working Memory ◽  
Rapid Serial Visual Presentation ◽  
Language Comprehension ◽  
Short Term Memory ◽  
Visual Presentation ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Use Of Knowledge

AbstractRapid serial visual presentation (RSVP) of words or pictured scenes provides evidence for a large-capacity conceptual short-term memory (CSTM) that momentarily provides rich associated material from long-term memory, permitting rapid chunking (Potter 1993; 2009; 2012). In perception of scenes as well as language comprehension, we make use of knowledge that briefly exceeds the supposed limits of working memory.

Brief summary of Kleť photographic search programme for minor planets

1999 ◽  
Vol 173 ◽  
pp. 189-192
Author(s):  
J. Tichá ◽  
M. Tichý ◽  
Z. Moravec
Keyword(s):  
Ccd Camera ◽  
Minor Planet ◽  
Minor Planets ◽  
Main Belt

AbstractA long-term photographic search programme for minor planets was begun at the Kleť Observatory at the end of seventies using a 0.63-m Maksutov telescope, but with insufficient respect for long-arc follow-up astrometry. More than two thousand provisional designations were given to new Kleť discoveries. Since 1993 targeted follow-up astrometry of Kleť candidates has been performed with a 0.57-m reflector equipped with a CCD camera, and reliable orbits for many previous Kleť discoveries have been determined. The photographic programme results in more than 350 numbered minor planets credited to Kleť, one of the world's most prolific discovery sites. Nearly 50 per cent of them were numbered as a consequence of CCD follow-up observations since 1994.This brief summary describes the results of this Kleť photographic minor planet survey between 1977 and 1996. The majority of the Kleť photographic discoveries are main belt asteroids, but two Amor type asteroids and one Trojan have been found.

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