Co-reporter:Zhicheng Li;Yang Li;Qiang Lei
European Biophysics Journal 2017 Volume 46( Issue 6) pp:
Publication Date(Web):
DOI:10.1007/s00249-017-1198-6
Co-reporter:Yiping Lu, Qing Zhao
Annals of Physics 2017 Volume 384(Volume 384) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.aop.2017.07.004
•PhaseLift is firstly applied in the adaptive quantum state tomography and the required store space of measurement operator is reduced.•Traditional adaptive quantum state tomography is extended to three-step adaptive quantum state tomography.•A new scheme of copy distribution of state is proposed to effectively use the limited copies of state.•For several tested states, the mean square error of the reconstructed state is reduced to 10−9 from 10−4.•Fidelity is more accurately estimated with limited copies of state compared with traditional adaptive quantum state tomography.
Multi-photon system has been studied by many groups, however the biggest challenge faced is the number of copies of an unknown state are limited and far from detecting quantum entanglement. The difficulty to prepare copies of the state is even more serious for the quantum state tomography. One possible way to solve this problem is to use adaptive quantum state tomography, which means to get a preliminary density matrix in the first step and revise it in the second step. In order to improve the performance of adaptive quantum state tomography, we develop a new distribution scheme of samples and extend it to three steps, that is to correct it once again based on the density matrix obtained in the traditional adaptive quantum state tomography. Our numerical results show that the mean square error of the reconstructed density matrix by our new method is improved to the level from 10−4 to 10−9 for several tested states. In addition, PhaseLift is also applied to reduce the required storage space of measurement operator.
Co-reporter:Qing Zhao, Waqas Mahmood, Yanying Zhu
Applied Surface Science 2016 Volume 367() pp:249-258
Publication Date(Web):30 March 2016
DOI:10.1016/j.apsusc.2016.01.055
Highlights
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Synthesis of dittmarite Mg(OH)2 coating on AZ31 alloy by hydrothermal method.
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The mechanism of composite coating growth and its characterizations.
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The coating is corrosion resistant significantly.
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Lack of hydroxyl deposition on the coating surface.
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Strong adhesion between the coating and the substrate.
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The synthesized coating meets the cytotoxicity standards.
Co-reporter:Chao Wang, Xue-Feng Liu, Wen-Kai Yu, Xu-Ri Yao, Long-Zhen Li, Qing Zhao, Guang-Jie Zhai
Optics Communications 2015 Volume 352() pp:45-48
Publication Date(Web):1 October 2015
DOI:10.1016/j.optcom.2015.04.081
Highlights•Image of two-dimensional object is obtained with a spectrometer without scanning.•The information in both spatial and spectral domains is measured simultaneously.•The spatial and spectral resolutions have a tradeoff relationship.We report an experimental demonstration of spectral imaging with a spectrometer without any scanning. The spatial resolution is provided by spatial light modulation based on the theory of compressed sensing. Objects with both continuous and discrete spectrum are used to demonstrate the performance of our system, which shows wide-spectrum and high efficient spectral imaging ability. The spatial and spectral resolutions of our imaging system are also discussed.
Co-reporter:Yanying Zhu, Qing Zhao, Yun-Hong Zhang, Guangming Wu
Surface and Coatings Technology 2012 206(11–12) pp: 2961-2966
Publication Date(Web):
DOI:10.1016/j.surfcoat.2011.12.029
Co-reporter:Yanying Zhu, Guangming Wu, Yun-Hong Zhang, Qing Zhao
Applied Surface Science 2011 Volume 257(Issue 14) pp:6129-6137
Publication Date(Web):1 May 2011
DOI:10.1016/j.apsusc.2011.02.017
Abstract
Magnesium-based biomaterials have been proposed as potential candidates for biodegradable implant materials, such as bone screws, bone plates, intraluminal stents and so on. However, the poor corrosion resistance inhibits their applications in surgery. They collapse before the injured tissues are healed. In this paper, Mg(OH)2 nonstructural film was synthesized on the substrate of AZ31 magnesium alloy by hydrothermal method with NaOH solution as mineralizer to reduce the corrosion rate of magnesium-based materials. The obtained films were characterized by XRD, SEM, and XPS. The results showed that a Mg(OH)2 film with nanostructure surface can be synthesized by hydrothermal method. It was observed that the thickness of film increased with the holding time. Corrosion rates of the films were studied by immersing the samples in Hank's solution (37 °C). Surface deposits of samples with films soaked in Hank's solution for 31 days were investigated by XRD, SEM, EDS, XPS, and FTIR. It verified that the corrosion rate of the magnesium alloy with grown film was slowed down in the Hank's solution and the behavior of corrosion was inhibited effectively. Amorphous calcium apatite precursor was observed to deposit on the surface of the film during corrosion experiments in Hank's solution. And the tape test revealed a strong adhesion between the film and the substrate.
Co-reporter:Qing Zhao, Rongping Deng, Francisco Zaera
Surface Science 2011 Volume 605(13–14) pp:1236-1242
Publication Date(Web):July 2011
DOI:10.1016/j.susc.2011.04.008
The thermal chemistry of allyl alcohol (CH2CHCH2OH) on a Ni(100) single-crystal surface was studied by the temperature programmed desorption (TPD) and the X-ray photoelectron spectroscopy (XPS). The allyl alcohol adsorbs molecularly on the metal surface at 100 K. Intact molecular desorption from the surface occurs at temperatures around 180 K, but some molecules exhibit chemical reactivity on the surface: activation of the OH, CC, and CO bonds produces η1(O)-allyloxy CH2CHCH2O(a), η2(C, C) allyl alcohol (C(a)H2C(a)HCH2OH), and η3(C, C, O)-alkoxide (C(a)H2C(a)CH2 O(a)) intermediates. Further thermal activation of allyl alcohol on the surface yields propylene (CH2CHCH3), 1-propanol (CH3CH2CH2OH), propanal (CH3CH2CHO), and combustion and dehydrogenation products (H2O, H2, and CO). Propylene desorbs from the surface at temperatures of around 270 K. Hydrogenation to the η3(C, C, O)-alkoxide intermediate leads to the production of propanal which desorbs from the surface around 320 K, while hydrogenation of the η2(C, C) allyl alcohol intermediate produces 1-propanol, which desorbs at around 310 K. The co-adsorption of hydrogen atoms on the surface enhances the formation of the saturated alcohol, while co-adsorption of oxygen enhances the formation of both the saturated alcohol and the saturated aldehydes.Research Highlights► The surface chemistry of allyl alcohol on Ni(100) was studied by TPD and XPS. ► The activation of both the OH bond and the C=C bond was observed in the experiments. ► Propylene is produced by the CO bond activation in the allyloxy intermediate. ► The co-adsorption of hydrogen atoms increases the production of 1-propanol. ► The co-adsorption of oxygen atoms increases the yields of both 1-propanol and propanal.
Co-reporter:Qing Zhao, Rongping Deng, Francisco Zaera
The Journal of Physical Chemistry C 2010 Volume 114(Issue 17) pp:7913-7919
Publication Date(Web):April 2, 2010
DOI:10.1021/jp100243t
The thermal chemistry of 1-chloro-2-methyl-2-propanol (CH2Cl(CH3)2COH) on a Ni(100) single-crystal surface, clean and after hydrogen preadsorption, was studied by temperature-programmed desorption and X-ray photoelectron spectroscopy. The 1-chloro-2-methyl-2-propanol adsorbs molecularly on the metal surface at 100 K. An initial chemical reaction is seen at around 180 K involving the sequential scission of the C−Cl and O−H bonds to produce hydroxyalkyl −CH2(CH3)2COH and oxametallacycle −CH2(CH3)2CO− intermediates. Hydrogenation of the first surface species produces tert-butyl alcohol, whereas further conversion of the oxametallacycle follows at least three reaction pathways, a cyclization to isobutene oxide, a hydrogenation to tert-butyl alcohol, and a dehydration reaction to produce isobutene, water, H2, and CO. It was also shown that hydrogen coadsorption on the surface enhances the production of tert-butyl alcohol and partially inhibits the decomposition to isobutene.
Co-reporter:Li-Wei Yu, Qing Zhao, Mo-Lin Ge
Annals of Physics (September 2014) Volume 348() pp:106-126
Publication Date(Web):September 2014
DOI:10.1016/j.aop.2014.05.014
Co-reporter:Jian-Ye Wei, Jing-Yu Liu, Waqas Mahmood, Qing Zhao
Physics Letters A (25 April 2017) Volume 381(Issue 16) pp:1463-1469
Publication Date(Web):25 April 2017
DOI:10.1016/j.physleta.2017.02.041
•The first-order Maxwell's equations are solved when a vortex flow exists.•The differential cross-section of the vortex flow is obtained.•The vortex flow has a deep influence on the scattering characteristics of the medium.In this paper, the scattering behaviour of an electromagnetic wave by vortex flow is studied in detail by solving the first-order (in v/c) Maxwell's equation in the cylindrical coordinate system (r, φ, z) and the general solutions are obtained. From these solutions, the differential cross-section of the vortex flow is calculated and the electromagnetic scattering characteristics of the vortex flow are discussed. The dependence of differential cross-section on the velocity profile and the radius of the vortex flow is investigated independently. Besides, by considering the dependence of scattering characteristics on the frequency of an incident wave we conclude that the vortex flow has frequency selectivity.
