Stromverteilung und Materiemitführung bei der Hohlpincherzeugung mit kondensierten Stickstoff-Molekularstrahlen / Current Distribution and Mass Pickup during a Hollow Dynamic Pinch Discharge in Condensed Molecular Beams of Nitrogen

1972 ◽  
Vol 27 (10) ◽  
pp. 1406-1409 ◽  
Author(s):  
E. W. Becker ◽  
R. Klingelhöfer ◽  
J. Wüst
Keyword(s):  
Current Distribution ◽  
Rapid Development ◽  
Molecular Beams ◽  
Cluster Beam ◽  
Current Sheath ◽  
Time Curve ◽  
Electrodynamic Forces ◽  
Z Pinch ◽  
A Current ◽  
Probe Measurements

Abstract The current distribution during a z-pinch discharge in a hollow cylindrical beam of nitrogen clusters is determined by magnetic probe measurements. After breakdown a current sheath arises within the ring-shaped cross section of the cluster beam. During the discharge the sheath is accelerated radially inward towards the axis. Simultaneously the radial collapse of a hollow luminosity pattern is observed by image converter photographs. The arrival of the current sheath at the axis coincides with the rapid development of a luminous core in the photographs. The radius-time curve of the sheath is calculated with the measured density of the electrodynamic forces neglecting pressure terms. Comparison of the observed and the calculated radius-time curves seems to indicate that most of the injected mass of the cluster beam is swept inward by the pinch discharge.

Experimental study of an inverse wire array z-pinch operating as a current switch

2010 ◽  
Author(s):  
A. Harvey-Thomson ◽  
S. V Lebedev ◽  
G. N. Hall ◽  
S. N. Bland ◽  
G. Burdiak ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wire Array ◽  
Current Switch ◽  
Z Pinch ◽  
A Current

scholarly journals Research on Sentiment Tendency and Evolution of Public Opinions in Social Networks of Smart City

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Yanni Liu ◽  
Dongsheng Liu ◽  
Yuwei Chen
Keyword(s):  
Social Networks ◽  
Social Network ◽  
Sentiment Analysis ◽  
Smart City ◽  
Topic Model ◽  
Rapid Development ◽  
Mobile Internet ◽  
Time Curve ◽  
Public Opinions ◽  
The Social

With the rapid development of mobile Internet, the social network has become an important platform for users to receive, release, and disseminate information. In order to get more valuable information and implement effective supervision on public opinions, it is necessary to study the public opinions, sentiment tendency, and the evolution of the hot events in social networks of a smart city. In view of social networks’ characteristics such as short text, rich topics, diverse sentiments, and timeliness, this paper conducts text modeling with words co-occurrence based on the topic model. Besides, the sentiment computing and the time factor are incorporated to construct the dynamic topic-sentiment mixture model (TSTS). Then, four hot events were randomly selected from the microblog as datasets to evaluate the TSTS model in terms of topic feature extraction, sentiment analysis, and time change. The results show that the TSTS model is better than the traditional models in topic extraction and sentiment analysis. Meanwhile, by fitting the time curve of hot events, the change rules of comments in the social network is obtained.

Spherical tensor approach to multipole expansions. II. Magnetostatic interactions

1976 ◽  
Vol 54 (5) ◽  
pp. 513-518 ◽  
Author(s):  
C. G. Gray ◽  
P. J. Stiles
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Interaction Energy ◽  
Current Distribution ◽  
Spherical Harmonic ◽  
Magnetostatic Interaction ◽  
Multipole Expansions ◽  
The Magnetic Field ◽  
A Current ◽  
Magnetostatic Interactions

The magnetic field due to a given current distribution, the interaction energy of a current distribution with an arbitrary external magnetic field, and the magnetostatic interaction energy between two current distributions are decomposed into multipolar components using spherical harmonic expansions. Diamagnetic interactions and the spin contributions to the multipole expansions are also discussed.

A model for precursor structure in supercritical perpendicular, collisionless shock waves

1978 ◽  
Vol 20 (2) ◽  
pp. 265-279
Author(s):  
D. Sherwell ◽  
R. A. Cairns
Keyword(s):  
Magnetic Field ◽  
Shock Waves ◽  
Wave Velocity ◽  
Current Distribution ◽  
Trapped Ions ◽  
Collisionless Shock ◽  
Precursor Structure ◽  
Insight Into ◽  
A Current

Magnetosonic solitons may be given smooth increasing profiles by assuming the presence within the wave of a current distribution Jy(x) of trapped ions perpendicular to Bz(x) and the wave velocity Vx. Suitable ions are found immediately upstream of perpendicular, collisionless shock waves and these are coincident with the often observed ‘foot’ in magnetic field profiles of moderately supercritical shocks. By modelling Jy(x) we apply the theory to previous experiments where Jy(x) is observed, and are able to reproduce reasonably, and thus explain, the profiles in the foot. Insight into a number of features of fast shocks is obtained.

Dependence of Switching Current Distribution of a Current-Biased Josephson Junction on Microwave Frequency

2015 ◽  
Vol 32 (4) ◽  
pp. 047402 ◽  
Author(s):  
Ji-Quan Zhai ◽  
Yong-Chao Li ◽  
Jian-Xin Shi ◽  
Yu Zhou ◽  
Xiao-Hu Li ◽  
...  
Keyword(s):  
Josephson Junction ◽  
Current Distribution ◽  
Microwave Frequency ◽  
Switching Current ◽  
A Current

On the new monotypic wolf spider genus Ovia gen. nov. (Araneae: Lycosidae, Lycosinae)

Zootaxa ◽  
2017 ◽  
Vol 4221 (3) ◽  
pp. 366 ◽  
Author(s):  
PRADEEP M. SANKARAN ◽  
JOBI J. MALAMEL ◽  
POTHALIL A. SEBASTIAN
Keyword(s):  
Sexual Dimorphism ◽  
Current Distribution ◽  
Type Species ◽  
New Genus ◽  
Wolf Spider ◽  
Distribution Map ◽  
Apical Process ◽  
Mating Plug ◽  
Relationship Of ◽  
A Current

A new monotypic wolf spider genus, Ovia gen. nov. is proposed to accommodate a misplaced species: Pardosa procurva Yu & Song, 1988. Ovia procurva comb. nov. is redescribed, illustrated and designated as the type species for the genus. The subfamily placement of the new genus is discussed and it is considered as a member of Lycosinae Sundevall, 1833 and possibly closely related to Alopecosa Simon, 1885. The presence of an apical process (spur) on the median apophysis is proposed as the putative synapomorphy of Ovia gen. nov. The possible sister-taxon relationship of Ovia gen. nov. with Alopecosa is discussed and evidence on the occurrence of sexual dimorphism and mating plug within the genus are presented. Ovia gen. nov. is assumed to be of Holarctic origin, from which it has migrated to the Indomalayan region. Additionally, a current distribution map for the genus is provided. 

Druckmessungen mit piezoelektrischen Sonden an einem linearen Z-Pinch

1964 ◽  
Vol 19 (6) ◽  
pp. 690-696 ◽  
Author(s):  
Klaus Büchl
Keyword(s):  
Momentum Flux ◽  
High Sensitivity ◽  
Good Time ◽  
Pressure Sensitive ◽  
Compression And Expansion ◽  
Kinetic Pressure ◽  
Z Pinch ◽  
Piezoelectric Probes ◽  
Probe Measurements ◽  
Made In

The radial distribution of the dynamic and kinetic pressure in a linear Z-pinch-discharge has been investigated with piezoelectric probes. The electrical signals from the probe are proportional to the momentum flux on the pressure-sensitive surface. The momentum flux is anisotropic, because there are radial plasma streams during the compression and expansion of the plasma cylinder. The dynamic and kinetic pressure were determined from the momentum flux by comparing the probe measurements made in different directions. The conditions and construction of the probe necessary for both a good time resolution and high sensitivity are described. The probes have time resolutions and sensitivities of 0.6 μs and 7.7 Torr/mV and 0.8 μs and 2.0 Torr/mV respectively.

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