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1. chinaXiv:201705.00490 [pdf]

Al/Al2O3 Composite Coating Deposited by Flame Spraying for Marine Applications: Alumina Skeleton Enhances Anti-Corrosion and Wear Performances

Huang, J [Huang, Jing][ 1 ]; Liu, Y [Liu, Yi][ 1 ]; Yuan, JH [Yuan, Jianhui][ 1 ]; Li, H [Li, Hua][ 1 ]

Here we report aluminum-alumina composite coatings fabricated by flame spraying for potential marine applications against both corrosion and wear. Microstructure examination suggested dense coating structures and the evenly distributed alumina splats form

submitted time 2017-05-02 Hits132Downloads81 Comment 0

2. chinaXiv:201705.00487 [pdf]

Hydroxyapatite nucleated and grown on nano titania particles enhances recruitment of Escherichia coli for subsequent photocatalytic elimination

Huang, J [Huang, Jing][ 1 ]; Liu, Y [Liu, Yi][ 1 ]; Liu, YX [Liu, Yuxin][ 1 ]; Li, H [Li, Hua][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Titania-hydroxyapatite (HA) nanocomposites were fabricated by wet chemical synthesis approach. HA exhibited crystallographic orientation of nucleation on nano titania particle, forming the composite particles with titania being partially enwrapped with HA. Microstructural characterization by high res- olution transmission electron microscopy revealed coherent interfacial bond of (110) and (222) planes of HA crystal with (101) plane of anatase. The HA layer promoted significantly recruitment of Escherichia coli bacteria onto the titania-based particles for subsequent photocatalytic killing. Less extent of enwrapping of HA on titania particle, as accomplished by increasing the aging time of HA suspension, gave rise to better capability of photocatalytic degradation of methylene blue and sterilization of the bacteria. The novel HA-enwrapped titania powder shows great potential for environmental applications.

submitted time 2017-05-02 Hits360Downloads159 Comment 0

3. chinaXiv:201705.00408 [pdf]

Nanostructural Characteristics of Vacuum Cold-Sprayed Hydroxyapatite/Graphene-Nanosheet Coatings for Biomedical Applications

Liu, Y [Liu, Yi][ 1 ]; Huang, J [Huang, Jing][ 1 ]; Li, H [Li, Hua][ 1 ]

Development of novel biocompatible nanomaterials has provided insights into their potential biomedical applications. Bulk fabrication of the nanomaterials in the form of coatings remains challenging. Here, we report hydroxyapatite [HA]/graphene-nanosheet

submitted time 2017-05-02 Hits94Downloads69 Comment 0

4. chinaXiv:201609.00914 [pdf]

Aging effect in the BESIII drift chamber

DONG Ming-Yi; XIU Qing-Lei; WU Ling-Hui; WU Zhi; QIN Zhong-Hua; SHEN Pin; AN Fen-Fen; JU Xu-Dong; LIU Yi; ZHU Kai; OU-YANG Qun; CHEN Yuan-Bo
Subjects: Physics >> Nuclear Physics

As the main tracking detector of BESIII, the drift chamber works for accurate measurements of the tracking and the momentum of the charged particles decayed from the reaction of BEPCII e+ and e-. After operation six years, the drift chamber is suffering from aging problems due to huge beam related background. The gains of the cells in the first ten layers experience an obvious decrease, reaching a maximum of about 29% for the first layer cells. Two calculation methods for the gains change (Bhabha events and accumulated charges with 0.3% aging ratio for inner chamber cells) get almost the same results. For the Malter effect encountered by the inner drift chamber in Jan., 2012, about 0.2% water vapor was added to MDC gas mixture to solve this cathode aging problem. These results provide an important reference for MDC operation high voltage setting and the upgrade of the inner drift chamber.

submitted time 2016-09-13 Hits477Downloads251 Comment 0

5. chinaXiv:201609.00885 [pdf]

Test of a fine pitch SOI pixel detector with laser beam

LIU Yi; LU Yunpeng; JU Xudong; OUYANG Qun
Subjects: Physics >> Nuclear Physics

A silicon pixel detector with fine pitch size of 19x19 um, developed base on SOI (silicon on insulator) technology, was tested under the illumination of infrared laser pulses. As an alternative way to particle beam tests, the laser pulses were tuned to very short duration and small transverse profile to simulate the tracks of MIPs (minimum ionization particles) in silicon. Hit cluster sizes were measured with focused laser pulses propagating through the SOI detector perpendicular to its surface and most of the induced charge was found to be collected inside the seed pixel. For the first time, the signal amplitude as a function of the applied bias voltage was measured for this SOI detector, deepening understanding of its depletion characteristics.

submitted time 2016-09-13 Hits430Downloads210 Comment 0

6. chinaXiv:201605.01577 [pdf]

PLASMA AND MAGNETIC FIELD CHARACTERISTICS OF SOLAR CORONAL MASS EJECTIONS IN RELATION TO GEOMAGNETIC STORM INTENSITY AND VARIABILITY

Liu, Ying D.; Hu, Huidong; Wang, Rui; Yang, Zhongwei; Zhu, Bei; Liu, Yi A.; Luhmann, Janet G.; Richardson, John D.
Subjects: Geosciences >> Space Physics

The largest geomagnetic storms of solar cycle 24 so far occurred on 2015 March 17 and June 22 with D-st minima of -223 and -195 nT, respectively. Both of the geomagnetic storms show a multi-step development. We examine the plasma and magnetic field characteristics of the driving coronal mass ejections (CMEs) in connection with the development of the geomagnetic storms. A particular effort is to reconstruct the in situ structure using a Grad-Shafranov technique and compare the reconstruction results with solar observations, which gives a larger spatial perspective of the source conditions than one-dimensional in situ measurements. Key results are obtained concerning how the plasma and magnetic field characteristics of CMEs control the geomagnetic storm intensity and variability: (1) a sheath-ejecta-ejecta mechanism and a sheath-sheath-ejecta scenario are proposed for the multi-step development of the 2015 March 17 and June 22 geomagnetic storms, respectively;(2) two contrasting cases of how the CME flux-rope characteristics generate intense geomagnetic storms are found, which indicates that a southward flux-rope orientation is not a necessity for a strong geomagnetic storm;and (3) the unexpected 2015 March 17 intense geomagnetic storm resulted from the interaction between two successive CMEs plus the compression by a high-speed stream from behind, which is essentially the "perfect storm" scenario proposed by Liu et al. (i.e., a combination of circumstances results in an event of unusual magnitude), so the "perfect storm" scenario may not be as rare as the phrase implies.

submitted time 2016-05-12 Hits749Downloads305 Comment 0

7. chinaXiv:201605.01479 [pdf]

Identification of lipid droplet structure-like/resident proteins in Caenorhabditis elegans

Na, Huimin; Zhang, Peng; Chen, Yong; Zhu, Xiaotong; Liu, Yi; Liu, Yangli; Xie, Kang; Yang, Fuquan; Zhang, Hong; Liu, Pingsheng; Na, Huimin; Zhang, Peng; Zhu, Xiaotong; Liu, Yangli; Xie, Kang; Xu, Ningyi; Mak, Ho Yi; Xu, Ningyi; Mak, Ho Yi; Yu, Yong
Subjects: Biology >> Biophysics >> Biochemistry & Molecular Biology

The lipid droplet (LD) is a cellular organelle that stores neutral lipids in cells and has been linked with metabolic disorders. Caenorhabditis elegans has many characteristics which make it an excellent animal model for studying LDs. However, unlike in mammalian cells, no LD structure-like/resident proteins have been identified in C. elegans, which has limited the utility of this model for the study of lipid storage and metabolism. Herein based on three lines of evidence, we identified that MDT-28 and DHS-3 previously identified in C. elegans LD proteome were two LD structure-like/resident proteins. First, MDT-28 and DHS-3 were found to be the two most abundant LD proteins in the worm. Second, the proteins were specifically localized to LDs and we identified the domains responsible for this targeting in both proteins. Third and most importantly, the depletion of MDT-28 induced LD clustering while DHS-3 deletion reduced triacylglycerol content (TAG). We further characterized the proteins finding that MDT-28 was ubiquitously expressed in the intestine, muscle, hypodermis, and embryos, whereas DHS-3 was expressed mainly in intestinal cells. Together, these two LD structure-like/resident proteins provide a basis for future mechanistic studies into the dynamics and functions of LDs in C. elegans. (C) 2015 Elsevier B.V. All rights reserved.

submitted time 2016-05-12 Hits737Downloads316 Comment 0

8. chinaXiv:201605.01315 [pdf]

Effects of Hypoxic Preconditioning on Synaptic Ultrastructure in Mice

Liu, Yi; Sun, Zhishan; Duan, Yunxia; Shi, Jingfei; Qi, Zhifeng; Meng, Ran; Sun, Yongxin; Ji, Xunming; Liu, Yi; Liu, Yi; Sun, Zhishan; Zeng, Xianwei; Sun, Shufeng; Chui, Dehua; Chui, Dehua
Subjects: Biology >> Biophysics >> Neurosciences

Hypoxic preconditioning (HPC) elicits resistance to more drastic subsequent insults, which potentially provide neuroprotective therapeutic strategy, but the underlying mechanisms remain to be fully elucidated. Here, we examined the effects of HPC on synaptic ultrastructure in olfactory bulb of mice. Mice underwent up to five cycles of repeated HPC treatments, and hypoxic tolerance was assessed with a standard gasp reflex assay. As expected, HPC induced an increase in tolerance time. To assess synaptic responses, Western blots were used to quantify protein levels of representative markers for glia, neuron, and synapse, and transmission electron microscopy was used to examine synaptic ultrastructure and mitochondrial density. HPC did not significantly alter the protein levels of astroglial marker (GFAP), neuron-specific markers (GAP43, Tuj-1, and OMP), synaptic number markers (synaptophysin and SNAP25) or the percentage of excitatory synapses versus inhibitory synapses. However, HPC significantly affected synaptic curvature and the percentage of synapses with presynaptic mitochondria, which showed concomitant change pattern. These findings demonstrate that HPC is associated with changes in synaptic ultrastructure. (C) 2014 Wiley Periodicals, Inc.

submitted time 2016-05-11 Hits1011Downloads255 Comment 0

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