Effect of different modes of high-frequency electric current on structural changes in the optic nerve in rabbits

2018 ◽  
Vol 71 (1) ◽  
pp. 60-66
Author(s):  
N. Bobrova ◽  
◽  
V. Vit ◽  
T. Sorochinskaya ◽  
N. Molchanyuk ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Electric Current ◽  
High Frequency ◽  
Structural Changes

scholarly journals STUDIES IN HYPERTHERMIA INDUCED BY THE HIGH FREQUENCY ELECTRIC CURRENT

1930 ◽  
Vol 85 (3) ◽  
pp. 675-686
Author(s):  
Fritz Bischoff ◽  
H.J. Ullmann ◽  
Elsie Hill ◽  
M. Louisa Long
Keyword(s):  
Electric Current ◽  
High Frequency

scholarly journals Morphology and Microcirculation Changes of Optic Nerve Head Between Simple High Myopia and Pathologic Myopia

2021 ◽  
Author(s):  
Wenquan Tang ◽  
Xuanchu Duan ◽  
Junyi Ouyang ◽  
YuLin Luo ◽  
Xilang Wang
Keyword(s):  
Optic Nerve ◽  
Optic Nerve Head ◽  
High Myopia ◽  
Structural Changes ◽  
Pathologic Myopia ◽  
Disease Development ◽  
Pathological Changes ◽  
Choroidal Perfusion ◽  
Morphology Changes

Abstract This study explored morphology and microcirculation changes of optic nerve head (ONH) in simple high myopia(SHM) and pathologic myopia(PM), in order to evaluate and identify ONH changes in the development of PM. We divided 193 right eyes of 193 patients into SHM and PM according to the retinopathy. We found that ONH is one of the earliest pathological changes in myopia, and its morphology changes were also the most obvious. PM is closely linked to the reduction of choroidal perfusion and structural changes of ONH. Microcirculation showed a significant priority changes in myopia. Further research should address whether these fndings are associated with future disease development in highly myopic eyes.

scholarly journals Longitudinal assessment of optic nerve head changes using optical coherence tomography in a primate microbead model of ocular hypertension

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anita S. Y. Chan ◽  
Tin Aung Tun ◽  
John C. Allen ◽  
Myoe Naing Lynn ◽  
Sai Bo Bo Tun ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optic Nerve ◽  
Ocular Hypertension ◽  
Optic Nerve Head ◽  
Structural Damage ◽  
Structural Changes ◽  
Lamina Cribrosa ◽  
Optical Coherence ◽  
Longitudinal Assessment ◽  
The Mean

Abstract In humans, the longitudinal characterisation of early optic nerve head (ONH) damage in ocular hypertension (OHT) is difficult as patients with glaucoma usually have structural ONH damage at the time of diagnosis. Previous studies assessed glaucomatous ONH cupping by measuring the anterior lamina cribrosa depth (LCD) and minimal rim width (MRW) using optical coherence tomography (OCT). In this study, we induced OHT by repeated intracameral microbead injections in 16 cynomolgus primates (10 unilateral; 6 bilateral) and assessed the structural changes of the ONH longitudinally to observe early changes. Elevated intraocular pressure (IOP) in OHT eyes was maintained for 7 months and serial OCT measurements were performed during this period. The mean IOP was significantly elevated in OHT eyes when compared to baseline and compared to the control eyes. Thinner MRW and deeper LCD values from baseline were observed in OHT eyes with the greatest changes seen between month 1 and month 2 of OHT. Both the mean and maximum IOP values were significant predictors of MRW and LCD changes, although the maximum IOP was a slightly better predictor. We believe that this model could be useful to study IOP-induced early ONH structural damage which is important for understanding glaucoma pathogenesis.

Vulcanization or Other Heat Treatment by Electrical Conduction

1944 ◽  
Vol 17 (1) ◽  
pp. 188-191
Author(s):  
Felix L. Yerzley
Keyword(s):  
Heat Treatment ◽  
Electric Current ◽  
High Frequency ◽  
Direct Consequence ◽  
Electrical Energy ◽  
Internal Resistance ◽  
Appreciable Amount ◽  
Rubber Belt ◽  
High Dielectric ◽  
Electrical Conductors

Abstract This communication relates to the heating of plastic materials of. a semiconducting nature by passing electricity through them. In particular, it relates to the vulcanization of rubber and rubberlike materials, including Neoprene, with heat generated by the conduction of an electric current and, similarly, it relates to the heat treatment of thermosetting plastics by conduction of an electric current. It is well known that all electrical conductors are heated to some extent by the passage of an electric current. This heating is a direct consequence of internal resistance. The effect so obtained is proportional to the electrical energy absorbed, and is expressed by the equation: power=I2R, in which I is the current in amperes between two points and R is the corresponding resistance in ohms. The unit of power is the watt. Others have used electrical means of heating unvulcanized rubber, but the disclosures differ fundamentally from this proposal. For example, Neerlye coils a steel ribbon and an uncured rubber belt in a spiral and heats the coil by passing electricity through the steel. Newton claims vulcanization by abeam of electrons from a cathode ray tube. The most significant disclosure is by Dufour. This claims the “process for the vulcanization of rubber characterized by the feature that the rubber to be heat-treated is arranged as a dielectric between the electrodes of an electric condenser to which there is applied a high frequency alternating current of a periodicity of several million cycles per second”. This patent is characterized by utilization of high-frequency fields of the order of several megacycles per second. Further, it is not required in induction curing with high-frequency current that the electrodes be in actual mechanical contact with the rubber. Induction curing is facilitated when the material to be heated has both a high power factor and a high dielectric constant, but high electrical conductivity of appreciable amount is not essential to the application of the method.

Structural changes in CЧ-25 cast iron in an amplitude-modulated high-frequency electromagnetic field

2009 ◽  
Vol 45 (2) ◽  
pp. 116-124 ◽  
Author(s):  
A. G. Anisovich ◽  
I. N. Rumyantseva ◽  
V. F. Bevza ◽  
E. I. Marukovich ◽  
V. V. Azharonok ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Cast Iron ◽  
High Frequency ◽  
Structural Changes ◽  
High Frequency Electromagnetic Field

scholarly journals A Study of Possible Reasons of the Damage by Electric Current of Traction Induction Motors Bearings of Electric Trains Lastochka and the Ways to Prevent This

2021 ◽  
Vol 2096 (1) ◽  
pp. 012001
Author(s):  
M Pustovetov
Keyword(s):  
Electric Current ◽  
High Frequency ◽  
Induction Motors ◽  
Electrical Breakdown ◽  
The Other ◽  
Technical Solution ◽  
Insulation Coating ◽  
Rolling Elements ◽  
Current Flows ◽  
Frequency Current

Abstract There is a problem of damage of bearings of traction induction motors of electric trains Lastochka by electric current. Based on the fact that the bearings have a ceramic insulation coating, and the cases of its electrical breakdown is not fixed, the authors put forward a version that a high-frequency current flows through the bearing as through an electric capacitance. The analysis show that the cause of the current can be a radio standard GSM-R. The proposed technical solution against the damage of bearings: the use of grounding shaft rings, replace the bearings on the other with ceramic rolling elements, arrangement of separate high-frequency grounding for the GSM-R antenna.

scholarly journals Macular Optical Coherence Tomography Imaging in Glaucoma

2021 ◽  
Author(s):  
Alireza Kamalipour ◽  
Sasan Moghimi
Keyword(s):  
Optical Coherence Tomography ◽  
Optic Nerve ◽  
Optic Nerve Head ◽  
Structural Changes ◽  
Posterior Segment ◽  
Spectral Domain ◽  
Optical Coherence ◽  
Tomography Imaging ◽  
Optical Coherence Tomography Imaging ◽  
Peripapillary Area

The advent of spectral-domain optical coherence tomography has played a transformative role in posterior segment imaging of the eye. Traditionally, images of the optic nerve head and the peripapillary area have been used to evaluate the structural changes associated with glaucoma. Recently, there is growing evidence in the literature supporting the use of macular spectral-domain optical coherence tomography as a complementary tool for clinical evaluation and research purposes in glaucoma.

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