Specific Time-Temperature Treatment Preparing the Melt for the Amorphous State

2016 ◽  
Vol 864 ◽  
pp. 55-59
Author(s):  
Vladimir Tsepelev ◽  
Ondrej Zivotsky ◽  
Nadezhda Tsepeleva
Keyword(s):  
Physical Properties ◽  
Amorphous State ◽  
Temperature Treatment ◽  
Magnetic Core ◽  
Chemical Model ◽  
Specific Time ◽  
Annealing Temperatures ◽  
Amorphous Ribbons ◽  
Uniform Composition

Taking into account the concept of the quasi-chemical model of the liquid micro-non-uniform composition and the research made on the physical properties of the Fe-and Co-based melts being crystallized, the unique technology of the melt time-temperature treatment has been developed. Amorphous ribbons produced using this technology require optimal annealing temperatures to be specifically selected. The results of studying nanocrystalline magnetic core’ properties and their structure in the course of annealing at temperatures below and above the optimal ones are presented.

Preparing the Melt for the Amorphous and Nanocrystalline State

2019 ◽  
Vol 821 ◽  
pp. 263-269
Author(s):  
Vladimir S. Tsepelev ◽  
Yuri N. Starodubtsev ◽  
Nadezhda Tsepeleva
Keyword(s):  
Critical Temperature ◽  
Amorphous Ribbon ◽  
Temperature Treatment ◽  
Magnetic Core ◽  
State Structure ◽  
Nanocrystalline State ◽  
Annealing Temperatures ◽  
Amorphous Ribbons ◽  
Applied Approach ◽  
Uniform Composition

The scientific as well as applied approach to addressing the problem of the particle’s liquid state structure should rely on experimental data related to the particular liquid; take into account the temperature interval of its existence, the history and the main aims of the investigation. Taking into account the concept of the quasi-chemical model of the liquid micro-non-uniform composition and the research made on the physical properties of the Fe-based melts being crystallized, the unique technology of the melt time-temperature treatment has been developed. Amorphous ribbons produced using this technology require optimal annealing temperatures to be specifically selected. The results of studying nanocrystalline magnetic core’ properties and their structure in the course of annealing at temperatures below and above the optimal ones are presented. In the amorphous ribbon obtained in the mode of preparation of the melt with overheating above the critical temperature, an enhanced value of the enthalpy of crystallization is found. After the heat treatments of the cores, the mode with overheating the melt above the critical temperature results in higher magnetic properties.

CARPENTER SILICON CORE IRON A

Alloy Digest ◽  
1991 ◽  
Vol 40 (1) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Magnetic Core

Abstract Carpenter Silicon Core Iron A, melted to exacting chemical specifications and carefully process controlled is a uniform quality magnetic core iron. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on heat treating and machining. Filing Code: Fe-94. Producer or source: Carpenter.

ROUND PERMALLOY 80

Alloy Digest ◽  
1976 ◽  
Vol 25 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Magnetic Core ◽  
Molybdenum Alloy ◽  
Nickel Iron ◽  
Low Field ◽  
Core Losses ◽  
Very High

Abstract Round Permalloy 80 is an 80% nickel-iron-molybdenum alloy that provides very high initial and maximum magnetic permeabilities and minimal core losses at low field strengths. This vacuum-melted product also offers the advantages of small size and weight in magnetic core and shielding materials for numerous applications. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-223. Producer or source: Spang Industries Inc..

Effects of Introduction of Initial Nuclei on Physical Properties of (Pb,La)(Zr,Ti)O 3 Films Crystallized from Amorphous State

2002 ◽  
Vol 271 (1) ◽  
pp. 199-204 ◽  
Author(s):  
Masafumi Kobune ◽  
Osamu Matsuura ◽  
Tomoaki Matsuzaki ◽  
Tatsuya Sawada ◽  
Hironori Fujisawa ◽  
...  
Keyword(s):  
Physical Properties ◽  
Amorphous State

Synthetic amorphous calcium phosphates (ACPs):preparation, structure, properties and biomedical applications

2021 ◽  
Author(s):  
Sergey V Dorozhkin
Keyword(s):  
Physical Properties ◽  
Biomedical Applications ◽  
Calcium Phosphates ◽  
Amorphous State ◽  
Calcium Orthophosphates ◽  
Structure Properties

Amorphous calcium phosphates (ACPs) represent a metastable amorphous state of other calcium orthophosphates (abbreviated as CaPO4) possessing variable compositional but rather identical glass-like physical properties, in which there are neither...

Physical properties of superhard and ultrahard fullerites created from solid C 60 by high-pressure-high-temperature treatment

1997 ◽  
Vol 64 (3) ◽  
pp. 247-250 ◽  
Author(s):  
V.D. Blank ◽  
S.G. Buga ◽  
N.R. Serebryanaya ◽  
G.A. Dubitsky ◽  
R.H. Bagramov ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Physical Properties ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
High Pressure High Temperature

scholarly journals Polyimide-Derived Graphite Films with High Thermal Conductivity

2021 ◽  
Author(s):  
Guanming Yuan ◽  
Zhengwei Cui
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Thermal Management ◽  
Temperature Treatment ◽  
Treatment Temperature ◽  
High Thermal Conductivity ◽  
Vacuum Furnace ◽  
Transformation Mechanism ◽  
Whole Process ◽  
Quality Control Strategy

Nowadays, polyimide-derived graphite films with high thermal conductivity have been increasingly applied in many cutting-edge fields needing thermal management, such as highly integrated microelectronics and wireless communication technologies. This chapter first introduces a variety of functional graphite films with high thermal conductivity of 500–2000 W/m K in the planar direction, then provides the preparation technology (including lab-scale preparation and industrial production) and quality control strategy of high-thermal-conductivity graphite films, which are derived from a special polymer- polyimide (PI) by carbonization and graphitization treatments through a suitable molding press in a vacuum furnace. The morphology, microstructure and physical properties as well as the microstructural evolution and transformation mechanism of PI films during the whole process of high-temperature treatment are comprehensively introduced. The nature of PI precursor (e.g., the molecular structure and planar molecular orientation) and preparation technics (e.g., heat-treatment temperature and molding pressure) are critical factors influencing their final physical properties. Currently challenged by the emerging of graphene-based graphite films, the latest developments and future prospects of various PI-derived carbons and composites (beyond films) with high thermal conductivity have been summarized at the end. This chapter may shed light on a promising and versatile utilization of PI-derived functional carbon materials for advanced thermal management.

scholarly journals Extended Release of Timolol from Ethyl Cellulose Microparticles Laden Hydrogel Contact Lenses

2015 ◽  
Vol 2 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Furqan A. Maulvi ◽  
Tejal G. Soni ◽  
Dinesh O. Shah
Keyword(s):  
Physical Properties ◽  
Ethyl Cellulose ◽  
Contact Lenses ◽  
Drug Loading ◽  
Amorphous State ◽  
Eye Drops ◽  
Hydrogel Microparticles ◽  
Zero Order Kinetics ◽  
The Impact

Glaucoma is a second leading cause of blindness globally after cataract, which is managed through eye drops, which are highly inefficient due to a low bioavailability of less than 1-5%. Frequent administration of eye drops leads to incompliance in patients, so there is a great need for medical device such as contact lenses to treat glaucoma. The objective of research was to provide sustained ocular delivery of timolol via prototype poly (hydroxyethyl methacrylate) hydrogel contact lenses which may improve bioavailability due to increase in ocular residence time of drug. The present work was to encapsulate drug in ethylcellulose microparticles, and to entrap these microparticles in the hydrogel. Microparticles were prepared by spray drying method using different ratios of drug to ethylcellulose. The solid state characterization studies of drug loaded microparticles revealed the transformation of drug to an amorphous state. The hydrogels were characterized by studying their optical and physical properties to determine their suitability as extended wear contact lenses. Microparticles laden hydrogels were compared with direct drug loaded hydrogels. The study of microparticles laden hydrogels showed reduction in optical and physical properties and the impact was proportional to the amount of microparticles in hydrogels. The results suggest the application of optimization and nanotechnology. In vitro drug release study revealed that direct loading batch delivers drug for 22 hours with high drug loading of 150 µg, while microparticles laden hydrogel deliver drug up to 48 hours (zero order kinetics) with low drug loading of 50 µg. The hydrogels appeared safe in the cytotoxicity study. The study demonstrated the promising potential of loading the ethyl cellulose microparticles into hydrogels to serve as a good platform for sustained ophthalmic drug delivery.

scholarly journals Differences In The Effects On Human Focus Of Music Playlists And Personalized Soundscapes, As Measured By Brain Signals

2021 ◽  
Author(s):  
Aia Haruvi ◽  
Ronen Kopito ◽  
Noa Brande-Eilat ◽  
Shai Kalev ◽  
Eitan Kay ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Young Adult ◽  
Physical Properties ◽  
Real Time ◽  
Future Research ◽  
Specific Time ◽  
Time Intervals ◽  
Brain Signals ◽  
Individual Participant ◽  
Over Time

ABSTRACTThe goal of this study was to learn what properties of sound affect human focus the most. Participants (N=62, 18-65y) performed various tasks while listening to either no background sound (silence), popular music playlists for increasing focus (pre-recorded songs), or personalized soundscapes (audio composed in real-time to increase a specific individual’s focus). While performing tasks on a tablet, participants wore headphones and brain signals were recorded using a portable electroencephalography headband. Participants completed four one-hour long sessions, each with different audio content, at home. We successfully generated brain-based models to predict individual participant focus levels over time and used these models to analyze the effects of various audio content during different tasks. We found that while participants were working, personalized soundscapes increased their focus significantly above silence (p=0.008), while music playlists did not have a significant effect. For the young adult demographic (18-36y), silence was significantly less effective at producing focus than audio content of any type tested (p=0.001-0.009). Personalized soundscapes enhanced focus the most relative to silence, but professionally crafted playlists of pre-recorded songs also increased focus during specific time intervals, especially for the youngest audience demographic. We also found that focus levels can be predicted from physical properties of sound, enabling human and artificial intelligence composers to test and refine audio to produce increases or decreases in listener focus with high temporal (millisecond) precision. Future research includes real-time adjustment of sound for other functional objectives, such as affecting listener enjoyment, calm, or memory.

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