Method of experimentally determining the magnetic-well depth in a system with minimum B

1971 ◽  
Vol 30 (4) ◽  
pp. 495-498
Author(s):  
V. M. Glagolev ◽  
Yu. V. Skosyrev ◽  
A. A. Shmarin
Keyword(s):  
1985 ◽  
Vol 25 (1) ◽  
pp. 71-84 ◽  
Author(s):  
E.F. Jaeger ◽  
L.A. Berry ◽  
C.L. Hedrick ◽  
R.K. Richards

1984 ◽  
Author(s):  
E. F. Jaeger ◽  
L. A. Berry ◽  
C. L. Hedrick ◽  
R. K. Richards

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
P. Kim ◽  
R. Jorge ◽  
W. Dorland

A simplified analytical form of the on-axis magnetic well and Mercier's criterion for interchange instabilities for arbitrary three-dimensional magnetic field geometries is derived. For this purpose, a near-axis expansion based on a direct coordinate approach is used by expressing the toroidal magnetic flux in terms of powers of the radial distance to the magnetic axis. For the first time, the magnetic well and Mercier's criterion are then written as a one-dimensional integral with respect to the axis arclength. When compared with the original work of Mercier, the derivation here is presented using modern notation and in a more streamlined manner that highlights essential steps. Finally, these expressions are verified numerically using several quasisymmetric and non-quasisymmetric stellarator configurations including Wendelstein 7-X.


2021 ◽  
Vol 22 (11) ◽  
pp. 5914
Author(s):  
Mengsheng Zha ◽  
Nan Wang ◽  
Chaoyang Zhang ◽  
Zheng Wang

Reconstructing three-dimensional (3D) chromosomal structures based on single-cell Hi-C data is a challenging scientific problem due to the extreme sparseness of the single-cell Hi-C data. In this research, we used the Lennard-Jones potential to reconstruct both 500 kb and high-resolution 50 kb chromosomal structures based on single-cell Hi-C data. A chromosome was represented by a string of 500 kb or 50 kb DNA beads and put into a 3D cubic lattice for simulations. A 2D Gaussian function was used to impute the sparse single-cell Hi-C contact matrices. We designed a novel loss function based on the Lennard-Jones potential, in which the ε value, i.e., the well depth, was used to indicate how stable the binding of every pair of beads is. For the bead pairs that have single-cell Hi-C contacts and their neighboring bead pairs, the loss function assigns them stronger binding stability. The Metropolis–Hastings algorithm was used to try different locations for the DNA beads, and simulated annealing was used to optimize the loss function. We proved the correctness and validness of the reconstructed 3D structures by evaluating the models according to multiple criteria and comparing the models with 3D-FISH data.


1973 ◽  
Vol 9 (1) ◽  
pp. 1-15 ◽  
Author(s):  
E. E. Nolting ◽  
P. E. Jindra ◽  
D. R. Wells

Detailed measurements of the trapped magnetic fields and currents in plasma structures generated by conical theta-pinches are reported. Studies of these structures interacting with a magnetic barrier, and with each other in a collision at the centre of a magnetic mirror, are reported. The magnetic well formed by the collision has been studied by simultaneous use of several diagnostic techniques. The measurements are in agreement with a force-free, collinear magnetic field configuration (Wells 1972). Arguments relating superposability and collinearity of flow fields to these observations are given.


2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Jati Batoro ◽  
Wiyono Batoro

The diversity of plant species functions as a shelterbelt, to prevent saltwater intrusion and avoid sulfur from the crater of Mount Ijen through the Banyuputih River in Situbondo Regency. The Situbondo-Banyuwangi area is strategic (Pantura), passing through the Baluran National Park, so it is essential to maintain biodiversity and water ecosystems. Mangroves, beach vegetation, cultivated plants, and forest vegetation are indicators of environmental protection and conservation. This study aims to reveal the diversity of flora species on the border of Baluran National Park, Banyuputih sub-district, Situbondo Regency, which is allegedly contaminated with salt material from the sea and sulfur from the crater of Mount Ijen. An interview was conducted to determine the function of flora, location elevation, water pH, and well depth. The results of the biodiversity survey were then collected and diagnosed, and the scientific name was then determined. Potential species diversity at the border from an altitude of 5 m above sea level (asl) – 62 m asl included 17 families and 29 species. The data on biodiversity, location elevation, water well depth, and pH indicate low sulfur and salt content; therefore, water resources can be used sustainably by the living things surround them.


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