scholarly journals ELECTROMIGRATION IN LITHIUM-TITANIUM FERRITE CERAMICS SINTERED IN RADIATION-THERMAL MODE

2021 ◽  
Vol 18 (2) ◽  
pp. 18-22
Author(s):  
A.P. Surzhikov ◽  
Keyword(s):  
Liquid Phase ◽  
Radiation Effects ◽  
Structural Rearrangement ◽  
Thermal Mode ◽  
Heating Period ◽  
Ceramic Samples ◽  
Radiation Induced ◽  
Thermal Sintering ◽  
Lithium Titanium ◽  
Stimulation Of

The study investigates electro-migration in Li–Ti ferrite ceramic samples sintered in radiation-thermal mode. To reveal radiation effects, similar measurements are performed for samples sintered in thermal mode. The effect of the state of grain boundaries and the presence of a low-melting additive on electrical properties of sintered ferrites is studied. It is found that structural rearrangement during radiation-thermal sintering occurs in early sintering stages, including the heating period. Study demonstrates that such behavior associated with radiation-induced intensification of the liquid phase spreading over the array of powder grains. In addition, it was shown that structural transformation may be caused by stimulation of intergranular slippage

The Combined Effects of Cycling Endurance and TID on Floating Gate Memory Cells

2021 ◽  
Author(s):  
Side Song ◽  
Guozhu Liu ◽  
Qi He ◽  
Xiang Gu ◽  
Genshen Hong ◽  
...  
Keyword(s):  
Radiation Effects ◽  
Memory Cell ◽  
Floating Gate ◽  
Combined Effects ◽  
Memory Cells ◽  
Threshold Voltage Shift ◽  
Floating Gate Memory ◽  
Interface Generation ◽  
Radiation Hardened ◽  
Radiation Induced

Abstract In this paper, the combined effects of cycling endurance and radiation on floating gate memory cell are investigated in detail, the results indicate that: 1.The programmed flash cells with a prior appropriate number of program and erase cycling stress exhibit much smaller threshold voltage shift than their counterpart in response to radiation, which is mainly ascribed to the recombination of trapped electrons (introduced by cycling stress) and trapped holes (introduced by irradiation) in the oxide surrounding the floating gate; 2.The radiation induced transconductance degradation in prior cycled flash cell is more severe than those without cycling stress in both of the programmed state and erased state; 3. Radiation is more likely to induce interface generation in programmed state than in erased state. This paper will be useful in understanding the issues involved in cycling endurance and radiation effects as well as in designing radiation hardened floating gate memory cells.

scholarly journals Simulated radiation effects in the superinsulating phase of titanium nitride films

2011 ◽  
Vol 26 (3) ◽  
pp. 254-260 ◽  
Author(s):  
Milos Vujisic ◽  
Dusan Matijasevic ◽  
Edin Dolicanin ◽  
Predrag Osmokrovic
Keyword(s):  
Titanium Nitride ◽  
Josephson Junction ◽  
Radiation Effects ◽  
Ion Beam ◽  
Material Structure ◽  
Pair Tunneling ◽  
Current Voltage ◽  
Josephson Junction Array ◽  
Radiation Induced ◽  
Junction Array

This paper investigates possible effects of alpha particle and ion beam irradiation on the properties of the superinsulating phase, recently observed in titanium nitride films, by using numerical simulation of particle transport. Unique physical properties of the superinsulating state are considered by relying on a two-dimensional Josephson junction array as a model of material structure. It is suggested that radiation-induced change of the Josephson junction charging energy would not affect the current-voltage characteristics of the superinsulating film significantly. However, it is theorized that a relapse to an insulating state with thermally activated resistance is possible, due to radiation-induced disruption of the fine-tuned granular structure. The breaking of Cooper pairs caused by incident and displaced ions may also destroy the conditions for a superinsulating phase to exist. Finally, even the energy loss to phonons can influence the superinsulating state, by increasing the effective temperature of the phonon thermostat, thereby reestablishing means for an energy exchange that can support Cooper pair tunneling.

scholarly journals BRAIN AND EYE AS POTENTIAL TARGETS FOR IONIZING RADIATION IMPACT. Part І. THE CONSEQUENCES OF IRRADIATION OF THE PARTICIPANTS OF THE LIQUIDATION OF THE CHORNOBYL ACCIDENT

2020 ◽  
Vol 25 ◽  
pp. 90-129
Author(s):  
K. Loganovsky ◽  
◽  
P. Fedirko ◽  
K. Kuts ◽  
D. Marazziti ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Neurodegenerative Diseases ◽  
Nuclear Power ◽  
Radiation Effects ◽  
Radiation Risk ◽  
International Studies ◽  
Neurocognitive Deficit ◽  
Radiation Induced ◽  
And Performance ◽  
Medical Radiology

Background.Exposure to ionizing radiation could affect the brain and eyes leading to cognitive and vision impairment, behavior disorders and performance decrement during professional irradiation at medical radiology, including interventional radiological procedures, long-term space flights, and radiation accidents. Objective. The objective was to analyze the current experimental, epidemiological, and clinical data on the radiation cerebro-ophthalmic effects. Materials and methods. In our analytical review peer-reviewed publications via the bibliographic and scientometric bases PubMed / MEDLINE, Scopus, Web of Science, and selected papers from the library catalog of NRCRM – the leading institution in the field of studying the medical effects of ionizing radiation – were used. Results. The probable radiation-induced cerebro-ophthalmic effects in human adults comprise radiation cataracts, radiation glaucoma, radiation-induced optic neuropathy, retinopathies, angiopathies as well as specific neurocognitive deficit in the various neuropsychiatric pathology including cerebrovascular pathology and neurodegenerative diseases. Specific attention is paid to the likely stochastic nature of many of those effects. Those prenatally and in childhood exposed are a particular target group with a higher risk for possible radiation effects and neurodegenerative diseases. Conclusions. The experimental, clinical, epidemiological, anatomical and pathophysiological rationale for visual system and central nervous system (CNS) radiosensitivity is given. The necessity for further international studies with adequate dosimetric support and the follow-up medical and biophysical monitoring of high radiation risk cohorts is justified. The first part of the study currently being published presents the results of the study of the effects of irradiation in the participants of emergency works at the Chornobyl Nuclear Power Plant (ChNPP). Key words: ionizing radiation, cerebroophthalmic effects, neurocognitive deficit, radiation accident, radiation cataracts, macular degeneration.

scholarly journals Differential Regulation of Ferritin Subunits and Iron Transport Proteins: An Effect of Targeted Hepatic X-Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Naila Naz ◽  
Shakil Ahmad ◽  
Silke Cameron ◽  
Federico Moriconi ◽  
Margret Rave-Fränk ◽  
...  
Keyword(s):  
Radiation Effects ◽  
Complete Blood Count ◽  
Mrna Level ◽  
Isolated Hepatocytes ◽  
Serum Marker ◽  
Neutrophil Granulocytes ◽  
Early Increase ◽  
Radiation Induced

The current study aimed to investigate radiation-induced regulation of iron proteins including ferritin subunits in rats. Rat livers were selectively irradiatedin vivoat 25 Gy. This dose can be used to model radiation effects to the liver without inducing overt radiation-induced liver disease. Sham-irradiated rats served as controls. Isolated hepatocytes were irradiated at 8 Gy. Ferritin light polypeptide (FTL) was detectable in the serum of sham-irradiated rats with an increase after irradiation. Liver irradiation increased hepatic protein expression of both ferritin subunits. A rather early increase (3 h) was observed for hepatic TfR1 and Fpn-1 followed by a decrease at 12 h. The increase in TfR2 persisted over the observed time. Parallel to the elevation of AST levels, a significant increase (24 h) in hepatic iron content was measured. Complete blood count analysis showed a significant decrease in leukocyte number with an early increase in neutrophil granulocytes and a decrease in lymphocytes.In vitro, a significant increase in ferritin subunits at mRNA level was detected after irradiation which was further induced with a combination treatment of irradiation and acute phase cytokine. Irradiation can directly alter the expression of ferritin subunits and this response can be strongly influenced by radiation-induced proinflammatory cytokines. FTL can be used as a serum marker for early phase radiation-induced liver damage.

Stereotactic radiosurgery for arteriovenous malformations of the basal ganglia and thalamus: an international multicenter study

2020 ◽  
Vol 132 (1) ◽  
pp. 122-131
Author(s):  
Ching-Jen Chen ◽  
Kathryn N. Kearns ◽  
Dale Ding ◽  
Hideyuki Kano ◽  
David Mathieu ◽  
...  
Keyword(s):  
Basal Ganglia ◽  
Stereotactic Radiosurgery ◽  
Arteriovenous Malformations ◽  
Radiation Effects ◽  
Favorable Outcome ◽  
Study Cohort ◽  
Multicenter Cohort Study ◽  
Radiation Induced ◽  
The Mean ◽  
International Multicenter Study

OBJECTIVEArteriovenous malformations (AVMs) of the basal ganglia (BG) and thalamus are associated with elevated risks of both hemorrhage if left untreated and neurological morbidity after resection. Therefore, stereotactic radiosurgery (SRS) has become a mainstay in the management of these lesions, although its safety and efficacy remain incompletely understood. The aim of this retrospective multicenter cohort study was to evaluate the outcomes of SRS for BG and thalamic AVMs and determine predictors of successful endpoints and adverse radiation effects.METHODSThe authors retrospectively reviewed data on patients with BG or thalamic AVMs who had undergone SRS at eight institutions participating in the International Gamma Knife Research Foundation (IGKRF) from 1987 to 2014. Favorable outcome was defined as AVM obliteration, no post-SRS hemorrhage, and no permanently symptomatic radiation-induced changes (RICs). Multivariable models were developed to identify independent predictors of outcome.RESULTSThe study cohort comprised 363 patients with BG or thalamic AVMs. The mean AVM volume and SRS margin dose were 3.8 cm3 and 20.7 Gy, respectively. The mean follow-up duration was 86.5 months. Favorable outcome was achieved in 58.5% of patients, including obliteration in 64.8%, with rates of post-SRS hemorrhage and permanent RIC in 11.3% and 5.6% of patients, respectively. Independent predictors of favorable outcome were no prior AVM embolization (p = 0.011), a higher margin dose (p = 0.008), and fewer isocenters (p = 0.044).CONCLUSIONSSRS is the preferred intervention for the majority of BG and thalamic AVMs. Patients with morphologically compact AVMs that have not been previously embolized are more likely to have a favorable outcome, which may be related to the use of a higher margin dose.

TOTAL DOSE EFFECTS IN LINEAR BIPOLAR INTEGRATED CIRCUITS

2004 ◽  
Vol 14 (02) ◽  
pp. 519-541 ◽  
Author(s):  
H. J. BARNABY
Keyword(s):  
Integrated Circuits ◽  
Total Dose ◽  
Radiation Effects ◽  
Rate Sensitivity ◽  
Circuit Parameter ◽  
Enhanced Sensitivity ◽  
Dose Effects ◽  
Radiation Induced ◽  
Total Dose Effects ◽  
Bipolar Circuit

Electronics systems that operate in space or strategic environments can be severely damaged by exposure to ionizing radiation. Space-based systems that utilize linear bipolar integrated circuits are particularly susceptible to radiation-induced damage because of the enhanced sensitivity of these circuits to the low rate of radiation exposure. The phenomenon of enhanced low-dose-rate sensitivity (ELDRS) demonstrates the need for a comprehensive understanding of the mechanisms of total dose effects in linear bipolar circuits. The majority of detailed bipolar total dose studies to date have focused on radiation effects mechanisms at either the process or transistor level. The goal of this text is to provide an overview of total dose mechanisms from the circuit perspective; in particular, the effects of transistor gain degradation on specific linear bipolar circuit parameters and the effects of circuit parameter degradation on select linear bipolar circuit applications.

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