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1. chinaXiv:201705.00436 [pdf]

Enhanced catalytic degradation of 4-NP using a superhydrophilic PVDF membrane decorated with Au nanoparticles

Wu, ZY [Wu, Ziyang][ 1,2 ]; Lin, HB [Lin, Haibo][ 1 ]; Wang, YZ [Wang, Yunze][ 1 ]; Yu, XM [Yu, Xuemin][ 1,2 ]; Li, JL [Li, Jinglong][ 1 ]; Xiong, Z [Xiong, Zhu][ 1 ]; Wang, Y [Wang, Yi][ 1 ]; Huang, YJ [Huang, Youju][ 1 ]; Chen, T [Chen, Tao][ 1 ]; Liu, F [Liu, Fu][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Poly(vinylidene fluoride) (PVDF) membranes have been widely applied to treat wastewater, however, the removal of toxic aromatic phenolic compounds remains a technical challenge due to the serious adsorption fouling and difficult degradation. Herein, we aimed to design a superhydrophilic PVDF membrane decorated with Au nanoparticles, which enhanced the rapid degradation of p-nitrophenol (4-NP). The superhydrophilic PVDF membrane with a micro/nano structured surface was decorated with Au nanoparticles via poly(dopamine) (PDA) as a spacer. The influences of membrane affinity (e.g. Hydrophilic Membrane (HM), micro/nano structured superhydrophilic membrane (MSiM), and micro/ nano structured superhydrophobic membrane (MSoM)) on PDA deposition and the subsequent Au decoration were comprehensively investigated. The synthesized Au nanoparticles were characterized using transmission electron microscopy (TEM) and UV-vis absorption spectra. The morphology and composition was evaluated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Static catalytic experiments demonstrated that MSiM degraded over 90% of 4-NP in 5 minutes with a kinetic reaction rate constant of 47.84 10 2 min 1 and high stability over 6 cycles. A membrane catalytic reactor (MCR) was designed to realize the continuous catalytic degradation of 4-NP with a kinetic reaction rate constant of 7 10 2 min 1.

submitted time 2017-05-02 Hits333Downloads225 Comment 0

2. chinaXiv:201609.00886 [pdf]

Method study of parameter choice for a circular proton–proton collider

SU Feng; GAO Jie; XIAO Ming; WANG Dou; WANG Yi-Wei; BAI Sha; BIAN Tian-Jian
Subjects: Physics >> Nuclear Physics

In this paper we showed a systematic method of appropriate parameter choice for a circular pp collider by using analytical expression of beam-beam tune shift limit started from given design goal and technical limitations. A parameter space has been explored. Based on parameters scan and considerations from RF systems, a set of appropriate parameter designed for a 50Km and a 100Km circular proton-proton collider was proposed.

submitted time 2016-09-13 Hits232Downloads146 Comment 0

3. chinaXiv:201608.00188 [pdf]

Preliminary Test Results of LAr Prototype Detector

Li Pei-Xian; Guan Meng-Yun; Yang Chang-Gen; Zhang Peng; Liu Jin-Chang; Zhang Yong-Peng; Guo Cong; Wang Yi
Subjects: Physics >> Nuclear Physics

WIMPs are a well-motivated galactic dark matter candidate. Liquid argon (LAr) is an attractive target for the direct detection of WIMPs. The LAr prototype detector is designed to study the technology and property of LAr detector. The prototype detector have an active volume containing 0.65 kg of liquid argon. The liquid nitrogen(LN) cooling system allows the temperature of liquid argon to be maintained at the boiling point (87.8 K) with fluctuations less than 0.1 K. The prototype was calibrated with a Na22 source, with the light yield 1.591�.019 p.e./keV for the 511 keV gamma rays using the domestic-made argon purification system.

submitted time 2016-08-30 Hits393Downloads242 Comment 0

4. chinaXiv:201605.01569 [pdf]


Zuo, Pingbing; Feng, Xueshang; Xie, Yanqiong; Wang, Yi; Xu, Xiaojun
Subjects: Geosciences >> Space Physics

In this investigation, we first present a statistical result of the interplanetary sources of very strong solar wind dynamic pressure pulses (DPPs) detected by WIND during solar cycle 23. It is found that the vast majority of strong DPPs reside within solar wind disturbances. Although the variabilities of geosynchronous magnetic fields (GMFs) due to the impact of positive DPPs have been well established, there appears to be no systematic investigations on the response of GMFs to negative DPPs. Here, we study both the decompression effects of very strong negative DPPs and the compression from strong positive DPPs on GMFs at different magnetic local time sectors. In response to the decompression of strong negative DPPs, GMFs on the dayside near dawn and near dusk on the nightside, are generally depressed. But near the midnight region, the responses of GMF are very diverse, being either positive or negative. For part of the events when GOES is located at the midnight sector, the GMF is found to abnormally increase as the result of magnetospheric decompression caused by negative DPPs. It is known that under certain conditions magnetic depression of nightside GMFs can be caused by the impact of positive DPPs. Here, we find that a stronger pressure enhancement may have a higher probability of producing the exceptional depression of GMF at the midnight region. Statistically, both the decompression effect of strong negative DPPs and the compression effect of strong positive DPPs depend on the magnetic local time, which are stronger at the noon sector.

submitted time 2016-05-12 Hits471Downloads277 Comment 0

5. chinaXiv:201605.01558 [pdf]


Zuo, Pingbing; Feng, Xueshang; Xie, Yanqiong; Wang, Yi; Li, Huijun; Xu, Xiaojun
Subjects: Geosciences >> Space Physics

Dynamic pressure pulses (DPPs) in the solar wind are a significant phenomenon closely related to the solar-terrestrial connection and physical processes of solar wind dynamics. In order to automatically identify DPPs from solar wind measurements, we develop a procedure with a three-step detection algorithm that is able to rapidly select DPPs from the plasma data stream and simultaneously define the transition region where large dynamic pressure variations occur and demarcate the upstream and downstream region by selecting the relatively quiet status before and after the abrupt change in dynamic pressure. To demonstrate the usefulness, efficiency, and accuracy of this procedure, we have applied it to the Wind observations from 1996 to 2008 by successfully obtaining the DPPs. The procedure can also be applied to other solar wind spacecraft observation data sets with different time resolutions.

submitted time 2016-05-12 Hits450Downloads265 Comment 0

6. chinaXiv:201605.01556 [pdf]


Zuo, Pingbing; Feng, Xueshang; Xie, Yanqiong; Wang, Yi; Xu, Xiaojun
Subjects: Geosciences >> Space Physics

Solar wind dynamic pressure pulse (DPP) structures, across which the dynamic pressure changes abruptly over timescales from a few seconds to several minutes, are often observed in the near-Earth space environment. The space weather effects of DPPs on the magnetosphere-ionosphere coupling system have been widely investigated in the last two decades. In this study, we perform a statistical survey on the properties of DPPs near 1 AU based on nearly 20 years of observations from the WIND spacecraft. It is found that only a tiny fraction of DPPs (around 4.2%) can be regarded as interplanetary shocks. For most DPPs, the total pressure (the sum of the thermal pressure and magnetic pressure) remains in equilibrium, but there also exists a small fraction of DPPs that are not pressure-balanced. The overwhelming majority of DPPs are associated with solar wind disturbances, including coronal mass ejection-related flows, corotating interaction regions, as well as complex ejecta. The annual variations of the averaged occurrence rate of DPPs are roughly in phase with the solar activity during solar cycle 23, and during the rising phase of solar cycle 24.

submitted time 2016-05-12 Hits446Downloads265 Comment 0

7. chinaXiv:201605.01343 [pdf]

V1 neurons respond to luminance changes faster than contrast changes

Wang, Wen-Liang; Li, Ran; Li, Da-Peng; Wang, Yi; Wang, Wen-Liang; Li, Ran; Ding, Jian; Tao, Louis; Tao, Louis
Subjects: Biology >> Biophysics

Luminance and contrast are two major attributes of objects in the visual scene. Luminance and contrast information received by visual neurons are often updated simultaneously. We examined the temporal response properties of neurons in the primary visual cortex (V1) to stimuli whose luminance and contrast were simultaneously changed by 50 Hz. We found that response tuning to luminance changes precedes tuning to contrast changes in V1. For most V1 neurons, the onset time of response tuning to luminance changes was shorter than that to contrast changes. Most neurons carried luminance information in the early response stage, while all neurons carried both contrast and luminance information in the late response stage. The early luminance response suggests that cortical processing for luminance is not as slow as previously thought.

submitted time 2016-05-11 Hits463Downloads253 Comment 0

8. chinaXiv:201605.01311 [pdf]

Recombinant Murine Gamma Herpesvirus 68 Carrying KSHV G Protein-Coupled Receptor Induces Angiogenic Lesions in Mice

Zhang, Junjie; Zhu, Lining; Lu, Xiaolu; Wang, Yi; Gao, Shou-jiang; Feng, Pinghui; Feldman, Emily R.; Keyes, Lisa R.; Tibbetts, Scott A.; Fan, Hui; Feng, Hao; Xia, Zanxian; Xia, Zanxian; Sun, Jiya; Jiang, Taijiao; Sun, Jiya; Jiang, Taijiao; Sun, Jiya; Jiang, Taijiao; Jiang, Taijiao
Subjects: Biology >> Biophysics

Human gamma herpesviruses, including Kaposi's sarcoma-associated herpesvirus (KSHV) and Epstein-Barr virus (EBV), are capable of inducing tumors, particularly in in immune-compromised individuals. Due to the stringent host tropism, rodents are resistant to infection by human gamma herpesviruses, creating a significant barrier for the in vivo study of viral genes that contribute to tumorigenesis. The closely-related murine gamma herpesvirus 68 (gamma HV68) efficiently infects laboratory mouse strains and establishes robust persistent infection without causing apparent disease. Here, we report that a recombinant gamma HV68 carrying the KSHV G protein-coupled receptor (kGPCR) in place of its murine counterpart induces angiogenic tumors in infected mice. Although viral GPCRs are conserved in all gamma herpesviruses, kGPCR potently activated downstream signaling and induced tumor formation in nude mouse, whereas gamma HV68 GPCR failed to do so. Recombinant gamma HV68 carrying kGPCR demonstrated more robust lytic replication ex vivo than wild-type gamma HV68, although both viruses underwent similar acute and latent infection in vivo. Infection of immunosuppressed mice with gamma HV68 carrying kGPCR, but not wild-type gamma HV68, induced tumors in mice that exhibited angiogenic and inflammatory features shared with human Kaposi's sarcoma. Immunohistochemistry staining identified abundant latently-infected cells and a small number of cells supporting lytic replication in tumor tissue. Thus, mouse infection with a recombinant gamma HV68 carrying kGPCR provides a useful small animal model for tumorigenesis induced by a human gamma herpesvirus gene in the setting of a natural course of infection.

submitted time 2016-05-11 Hits434Downloads255 Comment 0

9. chinaXiv:201605.01104 [pdf]

Non-commutativity, teleology and GRB time delay

Miao,Li; Pang,Yi; Wang,Yi
Subjects: Physics >> The Physics of Elementary Particles and Fields

We propose a model in which an energy-dependent time delay of a photon originates from space-time non-commutativity, the time delay is due to a non-commutative coupling between dilaton and photon. We predict that in our model, high energy photons with different momentum can either be delayed or superluminal, this may be related to a possible time delay reported by the Fermi LAT and Fermi GBM Collaborations

submitted time 2016-05-09 Hits293Downloads163 Comment 0

10. chinaXiv:201605.01100 [pdf]

Quantum UV/IR relations and holographic dark energy from entropic force

LI,Miao; Wang,Yi
Subjects: Physics >> The Physics of Elementary Particles and Fields

We investigate the implications of the entropic force formalism proposed by Verlinde. We show that an UV/IR relation proposed by Cohen et al., as well as an uncertainty principle proposed by Hogan can be derived from the entropic force formalism. We show that applying the entropic force formalism to cosmology, there is an additional term in the Friedmann equation, which can be identified as holographic dark energy. We also propose an intuitive picture of holographic screen, which can be thought of as an improvement of Susskind's holographic screen.

submitted time 2016-05-09 Hits200Downloads122 Comment 0

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