Assessment of Natural and Climatic Factors (the Earth’s Magnetic Field) in Selected Territories: Report 1

2021 ◽  
pp. 16-22
Author(s):  
SN Noskov ◽  
EG Golovina ◽  
OM Stupishina ◽  
GB Yeremin ◽  
NN Krutikova
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Climatic Factors ◽  
Local Population ◽  
Climatic Conditions ◽  
Monitoring Methods ◽  
Earth’S Magnetic Field ◽  
Significant Difference ◽  
Earth's Magnetic Field

Background: A man is constantly exposed to numerous environmental factors, including meteorological conditions of the earth and space weather. The study of human health effects of these factors is of increasing interest both for science and practice. Objective: To compare instrumental and computational methods for assessing the Earth’s magnetic field in selected territories for further identification of priority natural and climatic factors and development of region-specific measures for adaptation of the local population to climate change, which should be taken into account when conducting social and hygienic monitoring. Methods: Instrumental measurements of the Earth’s magnetic field strength were carried out on the territories of the Moscow, Voronezh, Rostov, and Krasnodar regions of the Russian Federation, in August 2020. The total number of measurements was at least 15 at each point. The studies were conducted in accordance with the existing approved standard. Results and discussion: The territories for the study were selected taking into account changes in the latitude of the area, which has a priority importance in the formation of natural and climatic conditions of these regions. During the research, it was found that there was no significant difference in the values of the Earth’s magnetic field strength during the day and at night, which is associated with the main error of the device (MTM-01 three-component magnetometer). The obtained instrumental values of the magnetic field strength index ranged from 37.1 to 40.51 A/m. When analyzing the results obtained, there is a tendency to increase the intensity of the Earth’s magnetic field in the direction from South to North (Krasnodar Territory, Rostov, Voronezh, Moscow regions). The range of calculated values of the intensity indicator was from 39.9 to 42.19 A/m. The obtained instrumental data correlate with the calculated values of the Earth’s magnetic field. Conclusions: We conducted instrumental studies complying with existing models for estimating the Earth’s magnetic field strength, thus enabling application of our estimates in scientific research.

Last two millenia Earth's Magnetic Field strength: New archaeointensity determinations from Ichkaantijo, Early to Late Maya Classic period

2018 ◽  
Vol 18 ◽  
pp. 292-299
Author(s):  
Avto Goguitchaitchvili ◽  
Rafael García Ruiz ◽  
Susana Echeverría Castillo ◽  
Juan Morales ◽  
Soledad Ortiz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Classic Period ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

Last three millennia Earth’s Magnetic field strength in Mesoamerica and southern United States: Implications in geomagnetism and archaeology

2018 ◽  
Vol 279 ◽  
pp. 79-91 ◽  
Author(s):  
Avto Goguitchaichvili ◽  
Rafael García Ruiz ◽  
F. Javier Pavón-Carrasco ◽  
Juan Julio Morales Contreras ◽  
Ana María Soler Arechalde ◽  
...  
Keyword(s):  
Magnetic Field ◽  
United States ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Southern United States ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

scholarly journals Comparison of gross tumor volumes of pulmonary metastasis defined by CT and MRI in 0.345 T MRI-guided radiotherapy

BJR|Open ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 20200010
Author(s):  
Yukihiro Hama ◽  
Etsuko Tate
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Correlation Coefficient ◽  
Magnetic Field Strength ◽  
Clinical Report ◽  
Significant Difference ◽  
Mri Guided ◽  
The Difference ◽  
Low Magnetic Field ◽  
Ct And Mri

Objective: To assess the difference in gross tumor volumes (GTVs) defined by CT (GTV-CT) and by low magnetic field strength (0.345 T) MRI (GTV-MRI) in patients simulated for MRI-guided radiotherapy forlung metastasis. Methods: 28 patients (148 lesions) who underwent CT and MRI simulation with the tri-60Co MRI-guided radiotherapy system (MRIdian, ViewRay) were included in this study. GTV-CT and GTV-MRI were compared using the paired t-test. The equivalence of variance between GTV-CT and GTV-MRI of small lesions (GTV-CT <1 ml) and large ones (GTV-CT >= 1 ml) was evaluated using F-test. The correlation between GTV-CT and GTV-MRI was evaluated by the correlation coefficient. Results: GTV-MRI was 120% larger than GTV-CT (p < 0.001) for small lesions, whereas GTV-MRI was 40% larger than GTV-CT (p < 0.001) for large lesions. In small lesions, the variation in GTV-MRI was significantly larger than that of GTV-CT (p < 0.001). There was no significant difference in the variation of GTV-MRI and GTV-CT in large lesions (p = 0.121). The correlation coefficient for small lesions was 0.93, whereas that for large lesions was 0.99, with large lesions having better correlation. Conclusions: GTV-MRI was larger than GTV-CT and the correlation between GTV-MRI and GTV-CT was better in large lesions. If the tumor volume is 1 ml or larger, the lesion can be accurately monitored even with a low magnetic field strength MRI. Advances in knowledge: This study is the first clinical report to evaluate the tolerability of MRI images in 0.345 T MRI-guided radiotherapy for lung metastasis. GTV contoured by MRI was larger than GTV by CT, and this tendency was more pronounced in small tumors of less than 1 ml.

Prevalence and MRI findings of incidentally detected pituitary non-enhancing lesion on brain MRI in children

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hae Won Yoo ◽  
Jeong Rye Kim ◽  
Jee Suk Yu
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Signal Intensity ◽  
Pediatric Patients ◽  
Brain Mri ◽  
Slice Thickness ◽  
Mri Findings ◽  
Contrast Enhanced ◽  
Significant Difference

Abstract Objectives To determine the prevalence and MRI findings of incidentally detected pituitary nonenhancing lesion on brain MRI in children, and to compare the detection rates of pituitary nonenhancing lesion according to magnetic field strength and acquisition technique. Methods Pediatric patients (≤18 years old) who underwent brain MRI with contrast-enhancement between January 2018 and September 2019 were retrospectively included (n=365). The presence, size, and signal intensity of pituitary nonenhancing lesions were assessed by two radiologists. The prevalence of pituitary nonenhancing lesions was compared between different magnetic field strengths and MRI acquisition techniques. Results Pituitary nonenhancing lesions were identified in 76 patients (20.8%). The anteroposterior diameter of pituitary nonenhancing lesion was the smallest diameter in most patients (93.4%; mean diameter ± SD of 2.4 ± 1.5 mm; range: 0.9–9.0 mm). Sixty-seven percent of the pituitary nonenhancing lesions were hypointense on T1-weighted imaging, 44.1% were hyperintense on T2-weighted imaging, and 12.9% showed low signal intensity on susceptibility-weighted imaging. There was no diffusion restriction in any of the nonenhancing lesions. There was no significant difference in the prevalence of pituitary nonenhancing lesions according to magnetic field strength, age, gender, slice thickness, or 2D vs. 3D contrast-enhanced T1-weighted imaging sequence. Conclusions Pituitary nonenhancing lesions were identified on contrast-enhanced brain MRI in 20.8% of pediatric patients, with no significant difference in the prevalence according to magnetic field strength, slice thickness, and 2D or 3D contrast-enhanced T1-weighted imaging.

On the Configuration of the Magnetic Field of β CrB

1976 ◽  
Vol 32 ◽  
pp. 613-622
Author(s):  
I.A. Aslanov ◽  
Yu.S. Rustamov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Radial Velocity ◽  
Magnetic Field Strength ◽  
Complex Shape ◽  
Rotation Period ◽  
Field Variation ◽  
Magnetic Field Variation ◽  
Secular Variations ◽  
The Magnetic Field

SummaryMeasurements of the radial velocities and magnetic field strength of β CrB were carried out. It is shown that there is a variability with the rotation period different for various elements. The curve of the magnetic field variation measured from lines of 5 different elements: FeI, CrI, CrII, TiII, ScII and CaI has a complex shape specific for each element. This may be due to the presence of magnetic spots on the stellar surface. A comparison with the radial velocity curves suggests the presence of a least 4 spots of Ti and Cr coinciding with magnetic spots. A change of the magnetic field with optical depth is shown. The curve of the Heffvariation with the rotation period is given. A possibility of secular variations of the magnetic field is shown.

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