Investigation of the current collected by a positively biased satellite with application to electrodynamic tethers


The interaction between a positively biased body traveling through an ionospheric space plasma has direct application to electrodynamic tether (EDT) systems. A 2-D3v particle-in-cell model has been developed to study the plasma dynamics near a positively charged EDT system end-body and their impact on the current collected. The results show that the azimuthal current structures observed during the reflight of the tethered satellite system (TSS-1R) mission develop in the simulations and are found to enhance the current collected by the satellite by 67% when the magnetic field is ∼15° off of perpendicular to the orbital velocity. As the component of the magnetic field in the simulation’s plane increases, the electrons are not able to easily cross the field lines causing plasma lobes to form in the +y and −y regions around the satellite. The lobes limit the current arriving at the satellite and also cause an enhanced wake to develop. A high satellite bias causes a stable bow shock structure to form in the ram region of the satellite, which limits the number of electrons entering the sheath region and thus limits the current collected. Electron-neutral collisions are found to destabilize the bow shock structure, and its current limiting effects were negated. Analytical curve fits based on the simulations are presented in order to characterize the dependence of the current collected on the magnetic field’s orientation, space plasma magnetization, and satellite potential. The variations in the collected current induced by space plasma environmental changes may introduce new instabilities in an EDT system’s dynamics.

Biomolecular logic gate for analysis of the New Delhi metallo-[small beta]-lactamase (NDM)-coding gene with concurrent determination of its drug resistance-encoding fragments

Chem. Commun., 2014, 50,12018-12021
DOI: 10.1039/C4CC01108B, Communication
Yu-Hsuan Lai, Yu-Chieh Liao, Jung-Jung Mu, Tsui-Ming Kuo, Yuan-Hao Hsu, Min-Chieh Chuang
The new strategy reported here facilitated analysis of long and highly structured genetic sequences, realizing specific identification of NDM and accurate evaluation of its drug resistance.
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Organocatalytic enantioselective and (Z)-selective allylation of 3-indolylmethanol via hydrogen-bond activation

Chem. Commun., 2014, 50,12054-12057
DOI: 10.1039/C4CC02056A, Communication
Yan Liu, Hong-Hao Zhang, Yu-Chen Zhang, Yan Jiang, Feng Shi, Shu-Jiang Tu
The title reaction led to allyl-substituted oxindoles with one all-carbon quaternary center and one newly formed C[double bond, length as m-dash]C bond in excellent stereoselectivity.
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Toehold-mediated DNA logic gates based on host-guest DNA-GNPs

Chem. Commun., 2014, 50,12026-12029
DOI: 10.1039/C4CC01883D, Communication
Yizhen Liu, Boran Dong, Zitong Wu, Wei Fang, Guohua Zhou, Aiguo Shen, Xiaodong Zhou, Jiming Hu
A simple, toehold-mediated two-way input DNA machine has been developed. Utilizing symmetric and asymmetric protector sequences, INH, XOR logic gates and a half-subtractor are designed based on this two-way structure.
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Self-assembly of supramolecularly engineered polymers and their biomedical applications

Chem. Commun., 2014, 50,11994-12017
DOI: 10.1039/C4CC03155E, Feature Article
Dali Wang, Gangsheng Tong, Ruijiao Dong, Yongfeng Zhou, Jian Shen, Xinyuan Zhu
Self-assembly behavior of supramolecularly engineered polymers and their biomedical applications have been summarized.
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The emerging multiple metal nanostructures for enhancing the light trapping of thin film organic photovoltaic cells

Chem. Commun., 2014, 50,11984-11993
DOI: 10.1039/C4CC03767G, Feature Article
Wallace C. H. Choy
The recent progress in organic photovoltaic cells incorporated with multiple metal nanostructures has been reviewed in this work.
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Direct validation of the restriction of intramolecular rotation hypothesis via the synthesis of novel ortho-methyl substituted tetraphenylethenes and their application in cell imaging

Chem. Commun., 2014, 50,12058-12060
DOI: 10.1039/C4CC04241G, Communication
Guo-Feng Zhang, Ze-Qiang Chen, Matthew P. Aldred, Zhe Hu, Tao Chen, Zhenli Huang, Xianggao Meng, Ming-Qiang Zhu
RIR hypothesis as the mechanism of aggregation-induced emission phenomenon is validated via the synthesis of ortho-methyl tetraphenylethenes.
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Folding-based photoelectrochemical biosensor: binding-induced conformation change of a quantum dot-tagged DNA probe for mercury(II) detection

Chem. Commun., 2014, 50,12088-12090
DOI: 10.1039/C4CC05373G, Communication
Zheng-Yuan Ma, Jian-Bin Pan, Cai-Yu Lu, Wei-Wei Zhao, Jing-Juan Xu, Hong-Yuan Chen
A folding-based photoelectrochemical sensor is successfully fabricated for sensitive Hg2+ detection based on CdS QDs and thymine-Hg2+-thymine complexes.
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A spiral designed surface based on amino-perylene grafted polyacrylic acid

Chem. Commun., 2014, 50,12034-12036
DOI: 10.1039/C4CC04207G, Communication
Elena Celia, Sonia Amigoni, Elisabeth Taffin de Givenchy, Gregory Pieters, Anne Gaucher, Damien Prim, Jean-Frederic Audibert, Rachel Meallet-Renault, Robert Pansu, Frederic Guittard
This communication shows the possibility of inducing spontaneous special surface organisation by means of grafting a fluorescent aminobenzo[g,h,i]perylene derivative onto surface grown polyacrylic chains.
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Nanoslitting of phase-separated block copolymers by solvent swelling for membranes with ultrahigh flux and sharp selectivity

Chem. Commun., 2014, 50,12022-12025
DOI: 10.1039/C4CC05009F, Communication
Leiming Guo, Yong Wang
Uniform slit-shaped pores with a width of <15 nm produced by selective swelling of block copolymers exhibit ultrahigh permeance and sharp selectivity.
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