[en] Nonlocal decoherence of two qubits due to pure phase damping has been investigated. We have proposed a scheme to keep the entanglement of two qubits from nonlocal decoherence. By applying a series of ±π pulses, nonlocal decoherence can be thoroughly suppressed. (general)

[en] The fatigue behavior of two kinds of riveted joints 6156-T6 aluminum alloy structures was experimentally investigated. The detail fatigue rating (DFR) values of 6156-T6 is calculated based on statistical analysis of fatigue tests. The fatigue crack initiation and propagation behavior are examined using scanning electron microscopy. The results show that DFR value of 6156-T6 aluminum alloy with riveted lap joints is 97.81MPa, and the DFR value of rivet-filled countersink hole structure is 168.39MPa. The crack initiation sites occurred at the vicinity of the fastener hole in all specimens. The fatigue striations were uniformly spaced in the region of stable crack growth. (paper)

[en] Photoelectrocatalytic decolorization of methlene blue (MB) in the presence of two types of carbon nanotube/titania and yttrium-treated carbon nanotube/titania electrodes in aqueous solutions were studied under visible light. The prepared composite electrodes were characterized by X-ray diffraction, transmission and scanning electron microscopy, energy dispersive X-ray analysis, and photoelectrocatalytic activity. The photoelectrocatalytic performances of the supported catalysts were evaluated for the decolorization of MB solution under visible light irradiation. The results showed that yttrium incorporation enhanced the decolorization rate of MB. It was found that the photoelectrocatalytic degradation of a MB solution could be attributed to the combined effects caused by the photo-degradation of titania, the electron assistance of carbon nanotube network, the enhancement of yttrium and a function of the applied potential. The repeatability of photocatalytic activity was also tested. The presence of yttrium enhanced the hydrophilicity of yttrium-carbon nanotubes/titania electrode because more OH groups can be adsorbed on the surface

[en] The resistance to neutron irradiation of LaBr₃ scintillator was studied in this work. The change of background counting rate, light output and energy resolution of the LaBr₃ scintillator were analyzed to determine whether the scintillator was damaged under different neutron flux rates induced by ²⁴¹Am-Be, D-T neutron generator, and reactor neutron source. The results show that the neutron radiation damage in LaBr₃ scintillator is mainly affected by neutron flux rate. Under low flux rate, the properties of the scintillator were hardly changing, while under high flux rate, there is obvious deterioration in the background spectra and in the energy resolution because of the neutron activation. After a period, the neutron radiation damage will spontaneously recover. (authors)

[en] Highlights: • Two tetrahydrophthalimide-functional benzoxazines were successfully synthesized. • Polymerization behavior and thermal properties were investigated. • Polymerization activation energy was calculated by Kissinger and Starink methods. • The predicated autocatalytic models were in excellent agreement with experimental results. -- Abstract: Two benzoxazine monomers with attached tetrahydrophthalimide at para and ortho position have been synthesized via Mannich condensation. The chemical structures of obtained monomers have been confirmed by ¹H and ¹³C nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infrared spectroscopy (FT-IR). The ring-opening polymerization has been examined by differential scanning calorimetry (DSC) analysis, which reveals that the ortho-tetrahydrophthalimide benzoxazine monomer exhibits lower polymerization temperature compared with its para-counterpart. Besides, the kinetic parameters have been determined by non-isothermal DSC at various heating rates. The apparent activation energy values of para- and ortho-tetrahydrophthalimide functional benzoxazine monomers are determined to be 107.12 and 91.00 kJ/mol, respectively, according to the Starink method. In addition, the polymerization processes of both monomers can be well described by autocatalytic kinetic models. The predicted curves based on the developed models from this study fit well with the experimental DSC thermograms. Moreover, the thermal properties of polybenzoxazines have also been evaluated by dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA).

[en] A new scheme for quantum teleportation of single quantum bit state with using continuous variables entangling channel is presented. In our scheme two entangled light fields are employed. An outstanding characteristic of this scheme is that one atomic state is transmitted directly to another atom without using the third atom as the mediate

[en] LaBr₃ : Ce and LaCl₃ : Ce which exhibit superior ability in detection of γ-rays have been studied extensively in recent years. The properties for both of the LaBr₃ : Ce scintillation detector and the LaCl₃ : Ce scintillation detector were studied. The relative sensitivities to incident γ-rays of different energy were obtained by calculation. The sensitivities of detectors to the ¹³⁷Cs and ⁶⁰Co sources were measured and the sensitivity ratio of γ-ray to neutron was inspected. The result shows that the LaBr₃ : Ce and LaCl₃ : Ce scintillation detectors with high sensitivities to γ-rays and good γ/n discrimination are very appropriate for measurement in the mixed field by neutrons and γ-rays. (authors)

[en] Thermal and ultrasonic treatments of graphene oxide (GO) are proposed to produce grapheneoxide layers. These layers were comprehensively characterized by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), Raman spectroscopy, and Atomic Force Microscopy (AFM). The XRD patterns of the GO layers produced by using thermal treatment showed a broad peak at around 26.09 .deg. , and those of the GO layers produced by using ultrasonic treatment showed a distinct peak at 11.07 .deg. . The FT-IR spectra indicated that the ultrasonic treatments for the sample GO did not change the functional group; however, all oxygen containing functional groups in the GO layers produced by using thermal treatment were nearly completely removed. The EDX results showed that only 8.6 wt.% oxygen still existed in the sample of GO layers produced by using thermal treatment. From the TEM images, monolayer graphene oxide could be found in a flake form in the GO layers by thermal treatment. The visible D peak, the clear G peak and the characterized 2D band in the Raman spectra indicate the existence of defect-free monolayer and few-layer graphenes. AFM results showed that a single layer of thermally treated graphene oxide had been produced.

[en] This paper reports on the development of a resource-efficient FPGA-based neural network regression model for potential applications in the future hardware muon trigger system of the ATLAS experiment at the Large Hadron Collider (LHC). Effective real-time selection of muon candidates is the cornerstone of the ATLAS physics programme. With the planned ATLAS upgrades for the High Luminosity LHC, an entirely new FPGA-based hardware muon trigger system will be installed that will process full muon detector data within a 10 µs latency window. The large FPGA devices planned for this upgrade should have sufficient spare resources to allow deployment of machine learning methods for improving identification of muon candidates and searching for new exotic particles. Our neural network regression model promises to improve rejection of the dominant source of background trigger events in the central detector region, which are due to muon candidates with low transverse momenta. This model was implemented in FPGA using 157 digital signal processors and about 5000 lookup tables. The simulated network latency and deadtime are 122 and 25 ns, respectively, when implemented in the FPGA device using a 320 MHz clock frequency. Two other FPGA implementations were also developed to study the impact of design choices on resource utilisation and latency. The performance parameters of our FPGA implementation are well within the requirements of the future muon trigger system, therefore opening a possibility for deploying machine learning methods for future data taking by the ATLAS experiment.

[en] Base on the Scattering and Absorbing Method, the high-energy gamma-ray detector is useful for the high-energy pulsed gamma-ray diagnosis within intense low-energy gamma (X) ray background. The sensitivities of the detector to 6.13 MeV and 1.25 MeV gamma ray are measured by the China Institute of Atomic Energy (CIAE) 600 keV Cockcroft-Walton Accelerator and the Northwest Institute of Nuclear Technology 8 000 Ci ⁶⁰Co irradiation device. Considering about the intensity of the gamma-ray, single particle calibration method and current calibration method are adopted. The experiment results match the Monte-Carlo simulation results within 14% difference. (authors)