Current Search: Temperature (x)
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Pages
- Title
- Experimental studies of yttrium barium(2)(copper(1-x)iron(x))(3)oxygen(7+delta) and bismuth(2)strontium(2)calcium(n-1)copper(n)oxygen(2n+4) high T(c) superconductors.
- Creator
- Lu, Huizong, Florida Atlantic University, Medina, Fernando D.
- Abstract/Description
-
Fe-substituted Y123 and Bi-based high Tc superconducting samples were prepared and studied. Magnetic susceptibility measurements, x-ray diffraction and Scanning Electron Microscopy were used to study the transition temperature Tc, preferential grain orientation and phase formation of the compounds. Tc was found to decrease more rapidly with Fe concentrations above 2.5%. Thermally reducing the oxygen content shows that Fe clusters form at high Fe concentrations. Magnetic susceptibility and x...
Show moreFe-substituted Y123 and Bi-based high Tc superconducting samples were prepared and studied. Magnetic susceptibility measurements, x-ray diffraction and Scanning Electron Microscopy were used to study the transition temperature Tc, preferential grain orientation and phase formation of the compounds. Tc was found to decrease more rapidly with Fe concentrations above 2.5%. Thermally reducing the oxygen content shows that Fe clusters form at high Fe concentrations. Magnetic susceptibility and x-ray diffraction measurements show that only the 80 K phase is present in Bi4Sr3Ca3Cu6Ox samples. For Bi0.7Pb0.3SrCaCu1.8Ox and Bi1.8Pb0.2Sr2Ca2Cu3Ox samples, the 110 K phase becomes dominant after sintering for 126 hours and 48 hours respectively. Preferential grain orientation was also observed in these materials.
Show less - Date Issued
- 1990
- PURL
- http://purl.flvc.org/fcla/dt/14643
- Subject Headings
- High temperature superconductivity, High temperature superconductors
- Format
- Document (PDF)
- Title
- The effects of the chelating agents on the 123-superconductor.
- Creator
- Zhuang, Huifang, Florida Atlantic University, Carraher, Charles E.
- Abstract/Description
-
This study reports the initial evaluation of the effect of selected chelating agents on the 123-superconductor. For the chelating agents oxalic acid and disodium oxalate, the extent and the rate of magnetic susceptibility decrease are discussed with respect to their concentration, site of chelation, exposure time and selectivity. The magnetic susceptibility measurements were carried out with a Superconductor Characterization Cryostat and the surface analysis was accomplished by employing...
Show moreThis study reports the initial evaluation of the effect of selected chelating agents on the 123-superconductor. For the chelating agents oxalic acid and disodium oxalate, the extent and the rate of magnetic susceptibility decrease are discussed with respect to their concentration, site of chelation, exposure time and selectivity. The magnetic susceptibility measurements were carried out with a Superconductor Characterization Cryostat and the surface analysis was accomplished by employing Auger Electron Spectroscopy (AES) and X-Ray Photoelectron Spectroscopy (XPS). The results show that the solution containing oxalic acid can remove copper atoms from the superconductor surface. The extent and the rate of superconductivity decrease can be controlled by changes in concentration, addition sequence and exposure time.
Show less - Date Issued
- 1990
- PURL
- http://purl.flvc.org/fcla/dt/14627
- Subject Headings
- High temperature superconductors, Chelates
- Format
- Document (PDF)
- Title
- Salinity and temperature effects on agar production from Gracilaria verrucosa Strain G-16.
- Creator
- Daugherty, Brenda K., Bird, Kimon T., Harbor Branch Oceanographic Institute
- Date Issued
- 1988
- PURL
- http://purl.flvc.org/FCLA/DT/3353813
- Subject Headings
- Gracilaria verrucosa, Agar, Salinity, Temperature
- Format
- Document (PDF)
- Title
- Preliminary study on carbondioxide, temperature and humidity profiles in a manned submersible.
- Creator
- Wang, Tsen C., Lenahan, Robert A., Harbor Branch Oceanographic Institute
- Date Issued
- 1982
- PURL
- http://purl.flvc.org/fau/fd/FA00007001
- Subject Headings
- Carbon dioxide, Submersibles, Temperature, Humidity
- Format
- Document (PDF)
- Title
- Experimental and theoretical studies of cryogenic sealing.
- Creator
- Jia, Lin X., Florida Atlantic University, Chow, Wen L., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
Funded by NASA Kennedy Space Center, this research project was to solve the liquid hydrogen leakage problem in the cryogenic system of Columbia space shuttle. A contracting-expanding self-sealing (CESSC) device was developed by making use of the thermal contraction ratio of dissimilar metals. A research cryostat providing with a high pressure and variable temperature test chamber was built to leak check the cryogenic fittings. A cryogenic research laboratory for the project was established in...
Show moreFunded by NASA Kennedy Space Center, this research project was to solve the liquid hydrogen leakage problem in the cryogenic system of Columbia space shuttle. A contracting-expanding self-sealing (CESSC) device was developed by making use of the thermal contraction ratio of dissimilar metals. A research cryostat providing with a high pressure and variable temperature test chamber was built to leak check the cryogenic fittings. A cryogenic research laboratory for the project was established in the Department of Mechanical Engineering, Florida Atlantic University. Both NASA KC126 fitting and the CESSC fitting were tested in the cryogenic testing system. A theoretical approach was also attempted to study the cryogenic leaking phenomenon. A finite element code was developed to simulate the thermal contraction for different CESSC designs. The ANSYS code was also used for the same purpose. The CESSC fittings were successfully used in the space program as well as in the superconducting projects. The principle of the CESSC seal has been extended to solve a variety of problems in cryogenic field.
Show less - Date Issued
- 1996
- PURL
- http://purl.flvc.org/fcla/dt/12448
- Subject Headings
- Sealing (Technology), Low temperature research
- Format
- Document (PDF)
- Title
- INDUCTIVE AND MODEL-TREE-BASED APPROACHES FOR FORECASTING TEMPERATURE.
- Creator
- Schauer, Alexis, Teegavarapu, Ramesh S. V., Florida Atlantic University, Department of Civil, Environmental and Geomatics Engineering, College of Engineering and Computer Science
- Abstract/Description
-
Inductive and model-tree (MT) approach-based models are developed and evaluated for forecasting mean, minimum and maximum monthly temperature in this study. The models are developed and tested using long-term historical temperature time series data derived from U.S. Historical Climatology Network at 22 sites located in the state of Florida. Inductive models developed include conceptually simple naïve models to multiple regression models utilizing lagged temperature values, sea surface...
Show moreInductive and model-tree (MT) approach-based models are developed and evaluated for forecasting mean, minimum and maximum monthly temperature in this study. The models are developed and tested using long-term historical temperature time series data derived from U.S. Historical Climatology Network at 22 sites located in the state of Florida. Inductive models developed include conceptually simple naïve models to multiple regression models utilizing lagged temperature values, sea surface temperatures (SSTs), correction factors derived using historical data. A global model using data from all the sites is also developed. The performances of the models were evaluated using observed temperature records and several error and performance measures. A composite measure combining multiple error and performance measures is developed to select the best model. MT approach-based and regression models with SSTs and correction factors along with lagged temperature values are found to be best models for forecasting temperature based on assessments of composite measures and error diagnostics.
Show less - Date Issued
- 2021
- PURL
- http://purl.flvc.org/fau/fd/FA00013856
- Subject Headings
- Temperature, Forecasting--Mathematical models
- Format
- Document (PDF)
- Title
- A comparison of winter and summer temperature variations in a shallow bar-built estuary.
- Creator
- Smith, Ned P.
- Date Issued
- 1983
- PURL
- http://purl.flvc.org/FCLA/DT/3174852
- Subject Headings
- Estuaries, Indian River (Fla. : Lagoon), Water temperature, Temperature measurements, Temperature--Seasonal variations
- Format
- Document (PDF)
- Title
- Carbaryl degradation on tree bark as influenced by temperature and humidity.
- Creator
- Zhong, H., Hastings, F. L., Hain, F. P., Monahan, J. F., Harbor Branch Oceanographic Institute
- Date Issued
- 1995
- PURL
- http://purl.flvc.org/fau/fd/FA00007226
- Subject Headings
- Carbaryl, Tree bark, Temperature, Humidity, Biodegradation
- Format
- Document (PDF)
- Title
- The effect of hyperpycnal water on tidal exchange.
- Creator
- Smith, Ned P.
- Date Issued
- 1996
- PURL
- http://purl.flvc.org/FCLA/DT/3172981
- Subject Headings
- Hydrology, Tides, Sediment transport, Salinity, Temperature
- Format
- Document (PDF)
- Title
- Nitrogen release from decomposing seaweeds: species and temperature effects.
- Creator
- Hanisak, M. Dennis
- Date Issued
- 1993
- PURL
- http://purl.flvc.org/FCLA/DT/3333210
- Subject Headings
- Decomposition (Chemistry), Nitrogen, Gracilaria, Seaweeds, Temperature
- Format
- Document (PDF)
- Title
- The combined effects of temperature and salinity on growth, development, and survival for tropical gastropod veligers of Strombus gigas.
- Creator
- Davis, Megan
- Date Issued
- 2000
- PURL
- http://purl.flvc.org/fau/3174051, http://purl.flvc.org/FCLA/DT/3174051
- Subject Headings
- Queen conch, Larvae, Spawning, Temperature, Salinity
- Format
- Document (PDF)
- Title
- Effect of preparation temperature on crystal structure and magnetic properties of nanophase Fe-substituted hydroxyapatite.
- Creator
- Kathriarachchi, Vindu, Leventouri, Theodora, Sorge, Korey D., Graduate College
- Date Issued
- 2013-04-12
- PURL
- http://purl.flvc.org/fcla/dt/3361934
- Subject Headings
- Hydroxyapatite, Magnetic properties, Crystals--Structure, Temperature
- Format
- Document (PDF)
- Title
- Assessing the Effects of Incubation Temperature on the Cognitive Ability of Hatchling Loggerhead (Caretta caretta) Sea Turtles.
- Creator
- Serra, Ivana, Milton, Sarah, Florida Atlantic University, Department of Biological Sciences, Charles E. Schmidt College of Science
- Abstract/Description
-
Under the expected warmer temperatures due to climate change, sea turtle embryos may be subjected to thermal conditions detrimental to nest success and hatchling quality; one trait which may be negatively affected is cognitive ability. In this study, loggerhead sea turtle eggs were acquired from Boca Raton, FL and lab incubated under two female-producing temperatures: an “optimal” temperature of 31°C and a sublethal temperature of 33°C. Cognitive ability of post-hatchlings, assessed via...
Show moreUnder the expected warmer temperatures due to climate change, sea turtle embryos may be subjected to thermal conditions detrimental to nest success and hatchling quality; one trait which may be negatively affected is cognitive ability. In this study, loggerhead sea turtle eggs were acquired from Boca Raton, FL and lab incubated under two female-producing temperatures: an “optimal” temperature of 31°C and a sublethal temperature of 33°C. Cognitive ability of post-hatchlings, assessed via associative learning and reversal was investigated using a y-maze. The sublethal temperature decreased incubation duration, hatch success, hatchling growth rates and produced smaller hatchlings with significantly more scute anomalies. Hot hatchlings performed worse on the reversal, taking longer to train, and thus hint at an effect of incubation temperature on cognitive flexibility in loggerhead turtles. With temperatures rising on beaches in South Florida, this study provides evidence of further potential threats to hatchling quality and potentially even survival.
Show less - Date Issued
- 2020
- PURL
- http://purl.flvc.org/fau/fd/FA00013559
- Subject Headings
- Loggerhead turtle, Eggs--Incubation, Temperature, Cognition
- Format
- Document (PDF)
- Title
- Simultaneous pressure-temperature measurements in a heat pipe.
- Creator
- Jayanth, Madhavan., Florida Atlantic University, Abtahi, Amir
- Abstract/Description
-
When a heat pipe operates with a large temperature difference between the two ends, the vapor liquid combination is not in thermodynamic equilibrium. The experiments showed that the vapor liquid mixture is in a higher state of saturation at the condenser as compared to other sections of the pipe. Correlations were obtained that relate the coefficient of thermal coupling alpha to the evaporator flux and mass of NCG (non-condensable gas). As mass of NCG is increased in the heat pipe, the...
Show moreWhen a heat pipe operates with a large temperature difference between the two ends, the vapor liquid combination is not in thermodynamic equilibrium. The experiments showed that the vapor liquid mixture is in a higher state of saturation at the condenser as compared to other sections of the pipe. Correlations were obtained that relate the coefficient of thermal coupling alpha to the evaporator flux and mass of NCG (non-condensable gas). As mass of NCG is increased in the heat pipe, the thermal coupling coefficient alpha decreases. The evaporator heat flux is directly proportional to alpha. The coefficient alpha is related to the pressures and temperatures at the evaporator, condenser and the adiabatic sections. In conclusion, for heat pipes that do not operate in thermodynamic equilibrium, correlations were obtained between the operating conditions of the heat pipe, the evaporator heat flux and the mass of NCG.
Show less - Date Issued
- 1997
- PURL
- http://purl.flvc.org/fcla/dt/15435
- Subject Headings
- Heat pipes, Temperature measurements, Pressure--Measurements
- Format
- Document (PDF)
- Title
- ELEVATED LEVELS OF HYPOTHALAMIC CALCIUM ION OR SODIUM ION: BEHAVIORAL AND PHYSIOLOGICAL THERMOREGULATION IN THE RAT.
- Creator
- HACKETT, EARLE RAYMOND, Florida Atlantic University
- Abstract/Description
-
To investigate the effects of elevated levels of hypothalamic Ca++ or Na+ on behavioral and physiological thermoregulation in the rat, bilateral cannula were implanted in various sections of the hypothalamus. In a cold environment, the introduction of artificial cerebrospinal fluid with a Ca++ excess into the posterior hypothalamus was followed by a significant increase in bar holding for 250 watt red-bulb infrared heat. In a neutral environment, introduction of the Ca++- excess solution into...
Show moreTo investigate the effects of elevated levels of hypothalamic Ca++ or Na+ on behavioral and physiological thermoregulation in the rat, bilateral cannula were implanted in various sections of the hypothalamus. In a cold environment, the introduction of artificial cerebrospinal fluid with a Ca++ excess into the posterior hypothalamus was followed by a significant increase in bar holding for 250 watt red-bulb infrared heat. In a neutral environment, introduction of the Ca++- excess solution into the posterior hypothalamus caused a significant increase in body temperature. The introduction of artificial cerebrospinal fluid with a Na+ excess under the same conditions caused respectively a significant decrease in responding for heat and a significant decrease in body temperature. Placements in the preoptic-anterior hypothalamus and lateral hypothalamus produced no significant behavioral or physiological results under either chemical conditions.
Show less - Date Issued
- 1973
- PURL
- http://purl.flvc.org/fcla/dt/13602
- Subject Headings
- Hypothalamus, Body temperature--Regulation, Body temperature--Effect of drugs on
- Format
- Document (PDF)
- Title
- The effect of water conditions on larval development of Nematostella vectensis.
- Creator
- Guidry, Alix Marie, Florida Atlantic University, Baldwin, John D.
- Abstract/Description
-
This project tested the effects of water conditions on developmental rates of larvae of the estuarine sea anemone Nematostella vectensis . Egg masses were collected immediately following fertilization and placed in solutions with different salinities and maintained in a temperature-controlled water bath. Every twelve hours, embryonic development was checked for progression through different morphological stages of development. Comparison of regression analyses of larval development at each...
Show moreThis project tested the effects of water conditions on developmental rates of larvae of the estuarine sea anemone Nematostella vectensis . Egg masses were collected immediately following fertilization and placed in solutions with different salinities and maintained in a temperature-controlled water bath. Every twelve hours, embryonic development was checked for progression through different morphological stages of development. Comparison of regression analyses of larval development at each temperature increment indicated that both temperature and salinity affected the rate of development; development was slower in lower conditions and faster at higher salinities and temperatures, with extreme conditions inducing deleterious effects. The suggested ideal conditions for these larvae are a salinity range of 12.5--20% and a temperature range of 22--24C. These parameters provide a foundation from which a standardized testing method may be established, using N. vectensis larval development.
Show less - Date Issued
- 2004
- PURL
- http://purl.flvc.org/fcla/dt/13169
- Subject Headings
- Marine animals--Larvae--Effect of temperature on, Sea anemones--Larvae--Effect of temperature on, Marine ecology, Water temperature, Estuarine ecology
- Format
- Document (PDF)
- Title
- Ingestion rateand feeding behavior of the peppermint shrimp Lysmata wurdemanni on Artemia nauplii.
- Creator
- Zhang, Dong, Lin, Junda, Creswell, R. LeRoy, Harbor Branch Oceanographic Institute
- Date Issued
- 1998
- PURL
- http://purl.flvc.org/fau/fd/FA00007269
- Subject Headings
- Shrimps, Shrimps--Feeding and feeds, Water temperature, Artemia
- Format
- Document (PDF)
- Title
- Growth of the sand shrimp, Crangon septemspinosa, in Rhode Island.
- Creator
- Wilcox, J. Ross, Jeffries, H. Perry, Harbor Branch Oceanographic Institute
- Date Issued
- 1973
- PURL
- http://purl.flvc.org/FCLA/DT/3333064
- Subject Headings
- Shrimps, Crangon, Decapoda (Crustacea)--Growth, Water temperature
- Format
- Document (PDF)
- Title
- Transport of warm, high-salinity water to fringing reefs in the Exuma Cays, Bahamas: implications for coral bleaching.
- Creator
- Pitts, Patrick A., Harbor Branch Oceanographic Institute
- Date Issued
- 1999
- PURL
- http://purl.flvc.org/fau/fd/FA00007051
- Subject Headings
- Exuma (Bahamas), Salinity, Coral bleaching, Water temperature, Reefs--Bahamas
- Format
- Document (PDF)
- Title
- A comparison of the thermal bleaching responses of the zoanthid Palythoa caribaeorum from three geographically different regions in south Florida.
- Creator
- Kemp, Dustin W., Cook, Clayton B., LaJeunesse, Todd C., Brooks, W. Randy
- Date Issued
- 2006
- PURL
- http://purl.flvc.org/FCLA/DT/2827836
- Subject Headings
- Ocean temperature --Observations, Coral bleaching, Symbiosis, Zooxanthella, Cnidarians
- Format
- Document (PDF)