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1
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Stability and stabilization of positive linear dynamical systems: new equivalent conditions and computations

100%
Yang H., Hu Y., Yang H., Hu Y.
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2
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Numerical checking method for positive invariance of polyhedral sets for linear dynamical systems

100%
Yang H., Hu Y., Yang H., Hu Y.
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3
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Mechanical Behavior of Clinched Sheet Material Joints and Strength Design Procedure

72%
He X., Gao A., Yang H., Xing B.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
698-700
EN
Clinching is an effective joining technique for lightweight sheet materials that are difficult or impossible to weld. A theoretical model for clinched joints in metal sheets was established and a design method for improving joint strength by selecting different clinching tools was proposed. The analytic model is defined as a function of the neck-thickness and the undercut, which are the key parameters of joint geometry. Based on the analytic model, the design method of clinched joint strength that can satisfy required strength was proposed. Clinching experiments were conducted with 2.00 mm thick aluminium alloy 5052 sheets. Various conditions were used during the clinching process to validate the joint strength model. Tensile-shear strength of clinched joints was measured by a servo-hydraulic testing machine. The calculated joint strength was in good agreement with the experimental results.
4
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Nonnegativity, stability analysis of linear discrete-time positive descriptor systems: an optimization approach

72%
Yang H., Zhou M., Zhao M., Pan P.
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2018
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issue 1
5
Content available remote

A Compact High Current Vacuum Diode Based on a Ceramic-Metal Welding Interface

63%
Xun T., Zhang J., Yang H., Wang Y., Liu Z.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1013-1015
EN
For one kind of high current diodes composed of a ceramic-metal welding vacuum interface, the electrical design was presented. For compactness, a radial type insulator and a cone-column anode crust were adopted. The shielding methods around cathode and anode region were applied to mitigate the influence of welding solder to vacuum flashover. Finite Element Analysis (FEA) simulation results indicated that by adjusting the anode outline and shielding shape, the electric fields along the ceramic were well distributed. High voltage test was conducted on a long-pulse accelerator and experimental results confirm the theoretic design: the diode can stably hold on 400 kV and 200 ns voltage pulse.
6
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Zero-Bias Anomaly in Magnetic Tunnel Junctions

63%
Yang H., Yang S., Ilnicki G., Martinek J., Parkin S.
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issue 2
316-318
EN
We present experimental results, which may indicate the possibility of the coexistence of the Kondo effect and ferromagnetism in macroscopic planar magnetic tunnel junctions with a layer of nanodots inside tunnel barriers. A conductance double peak structure was observed. Magnetic field dependence of the splitting of a conductance peak, and temperature evolution of the conductance curves are well explained from the theoretical point of view according to the predictions of the Kondo physics and cotunneling in the Anderson quantum dot coupled to ferromagnetic leads.
7
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Evaluation of Surface Characteristics and Physical Properties on Biodegradable Magnesium-Calcium Alloys by Anodic Oxidation

55%
Kim J., Lee J., Yang H., Park S., Lim H., Oh G., Yun K.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
736-741
EN
The purpose of this study was to determine the effect of calcium (Ca) on the surface characteristics and physical properties of magnesium-calcium alloys after anodization. A novel binary alloy Mg-xCa (in which x=0.5, 1, or 5 wt.%) was cast by combining magnesium (99.9%) and calcium (99.9%) in an argon gas (99.99%) atmosphere. A magnesium alloy rod having a diameter of 15 mm was cut into discs, each 2 mm thick. The specimens were subjected to anodic oxidation at 120 V for 15 minutes at room temperature in an electrolyte solution consisting of calcium gluconate, sodium hexametaphosphate, and sodium hydroxide. Surface and cross-sectional morphological changes were observed using scanning electron microscopy, and the microstructures and phases were detected by means of X-ray diffraction. Hardness and surface roughness were assessed by means of a Vickers hardness tester and a surface roughness meter, respectively. The results show that the physical properties of these magnesium-calcium alloys have been improved, because it was possible to control the dissolution rate according to the amount of calcium added.
8

Association of 3 polymorphisms in porcine troponin I genes (TNNI1 and TNNI2) with meat quality traits

55%
Yang H., Xu Z. Y., Lei M. G., Li F. E., Deng C. Y., Xiong Y. Z., Zuo B.
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EN
The contractile protein troponin I (TnI), a constituent protein of the troponin complex located on the thin filaments of striated muscle, is involved in inhibition of calcium-induced myosin ATPase activity (and thus contraction). TnI-slow (slow-twitch skeletal muscle isoform, named TNNI1) and TnI-fast (fast-twitch skeletal muscle isoform, named TNNI2) are muscle-fiber-type-specific proteins, and expression of their genes may affect the composition of muscle fiber, thereby influencing the meat quality traits. Thus, the TnI genes are potential candidate genes for traits related to meat quality in animals. Association of 2 SNPs (EU743939:g.5174T>C in intron 4, and EU743939:g.8350C>A in intron 7) of the TNNI1 gene and a SNP (EU696779:g.1167C>T in intron 3) of the TNNI2 gene with 11 meat quality traits were studied on 334 Large White x Meishan F2 pigs. In the TNNI1 gene, g.5174T>C and g.8350C>A were found to be significantly associated with intramuscular fat content and meat color value of biceps femoris. The g.5174T>C also showed significant effects on meat color value and marbling score of longissimus dorsi, as well as pH of longissimus dorsi and semispinalis capitis. The g.1167C>T polymorphism in the TNNI2 gene affected significantly the pH of longissimus dorsi, meat color value of longissimus dorsi and semispinalis capitis, marbling score of longissimus dorsi, and intramuscular fat.
9
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Experimental Studies on Charging Operation of a Compact Repetitive Tesla Transformer

46%
Zhang Z., Zhang J., Yang H., Qian B., Meng Z., Li D., Wang S., Cao Y., Zhou W.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
973-975
EN
Charging operations of a compact Tesla transformer were experimentally investigated, in single-shot and rep-rate (50 pps for 1 s) modes, respectively. The charging limitations were also explored. The experimental results were compared and analyzed. The maximum secondary charging voltages of the Tesla transformer were measured to be 380 kV and 300 kV in single-shot and rep-rate modes, respectively. The RMS pulse-to-pulse instability of the secondary charging voltage is generally less than 10% but increases with the increasing initial voltage across the primary capacitor. Since the secondary capacitor of the Tesla transformer is a pulse forming line (PFL), continued operation is possible if there is breakdown in the PFL. Furthermore, operation can even be continued under occasional breakdown for some pulses, without the effects on the operations of subsequent pulses.
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