[en] Taking into account of the constraints on the relevant parameters from the muon anomalous magnetic moment, we consider the contributions of the vector bileptons V^± and U^±± predicted by the reduced minimal 331 model to the Higgs decay channels h→γγ and Zγ. Our numerical results show that the vector bileptons can enhance the partial width Γ(h→γγ), while reduce the partial width Γ(h→Zγ), which are anti-correlated. With reasonable values of the relevant free parameters, the vector bileptons can explain the LHC data for the γγ signal. If the CMS data persists, the values of the free parameters λ₂ and λ₃ should be severe constrained

No abstract available

[en] NaI detector is often used to measure the total radiation amount for radiation dose detection of indoor environment. However, it is different that the detector responds to γ-ray of different energy. In addition, the response of the energy has not been corrected in the total radiation amount measuring. The certain deviation of the obtained dose value influences the accurate detection of the indoor radiation dose. Radiation dose testing research of indoor environment based on γ energy spectrometer is stated. (authors)

[en] A carrier consisting of lipid-coated hollow mesoporous silica nanospheres (L-HMSN) was produced for the combination of the water-insoluble drug (paclitaxel, PTX) and the water-soluble drug (doxorubicin, DOX). DOX was adsorbed into the nanoscale hollow structure of the hollow mesoporous silica nanospheres (HMSN) by adsorption and PTX was wrapped in the phospholipid layer of the HMSN surface by lipid film hydration method. The characterization results showed that DOX and PTX were present in the nanopheres in an amorphous state. The loaded L-HMSN (DOX/PTX@L-HMSN) in vitro drug release showed a sustained release in phosphate buffered solution (PBS) at pH 6.8 and 0.001%SDS. The cellular uptake experiment indicated that L-HMSN was successfully taken up by A549 cells. In addition, the combination of DOX and PTX in L-HMSN exhibited a marked synergistic effect in inhibiting the proliferation of A549 cells. The pharmacokinetic study demonstrated that L-HMSN could significantly improve the relative bioavailability of DOX and PTX. These results confirm that L-HMSN is a promising carrier for successful drug combination. - Highlights: • L-HMSN as a platform is used for combination of DOX and PTX • The drug delivery system demonstrates synergy effect in inhibiting A549 cell proliferation • The drug delivery system slowly releases the drugs and improves drug absorption

[en] In order to understand the radiosensitizing effects on human glioma cells SHG44 using celecoxib, a cyclooxygenase (COX)-2 selective inhibitor, MTT assay was used to determine the effect of celecoxib on the cell growth, and Colony Formation assay, Reverse transcription-PCR assay were used to investigate the effect of celecoxib or combined with ⁶⁰Co γ-irradiation on cell colony formation rate and the levels of COX-2 mRNA expression. Experimental results suggested that the cytotoxicity of celecoxib enhanced along with the increment of drug's concentration. The celecoxib could inhibit colony formation in SHG44 cells. When combined with ⁶⁰Co γ-irradiation, COX-2 mRNA expression levels was lower than that of control, drug and irradiation group respectively. The study confirmed the radiosensitizing effects of this drug to human glioma cells SHG44, and it might be closely related to the COX-2 mRNA expression levels. (authors)

[en] Highlights: • The triple junction nanostructured ZrO₂/Pd/C was prepared to simulate enzymatic effect of proton transfer enhancement. • The incorporated ZrO₂ in Pd/C enhances the activity of electrocatalytic hydrogenation of benzaldehyde by over 200%. • The ZrO₂ can improve proton transfer around ZrO₂/Pd/C by increasing local acidity. • The ZrO₂/Pd/C exhibits higher electrochemical stability than Pd/C in acidic environment. Nature is abundant with multi-functional and efficient catalysts such as redox enzymes which scientists wish to emulate with synthetic catalysts. One approach is to tune molecular catalysts through metal-organic ligands but there are grand challenges of molecular catalysts for real applications in energy field. Here we demonstrate a robust inorganic construct based on metal-metal oxide-carbon triple junction nanostructures (ZrO₂/Pd/carbon) that mimics the functions of enzymes for highly efficient proton transport. The metal oxide tunes the local acidic environment of the metal and improves its ability for proton transport, efficient adsorption of substrate, and accelerated electron transfer. Using electrocatalytic hydrogenation (ECH) of benzaldehyde as a model reaction, we show that the intrinsic activity of the metal toward hydrogenation reaction is improved by over 200 % on the triple junction nanostructured catalysts. This study demonstrates the potential of rational design of multicomponent nanostructured catalysts to achieve enzyme like properties in synthetic catalysts.

[en] Highlights: • 3D carbon nanotube foams (CNTF) are obtained by directly conversing CO_2. • As-grown CNTF can be used as a current collector for supercapacitors to substitute metal one. • Binder-free porous Ni(OH)_2 nanosheet array are fabricated on the CNTF. • Enhanced electrical conductivity leads to excellent electrochemical performance. • The present method maybe a general strategy for fabricating other 3D macroscopic structures. - Abstract: Carbon nanotube (CNT) is an ideal electrode material for supercapacitors due to its low electronic and ionic charge-transfer resistances. Here we reported the direct synthesis 3D carbon nanotube foam (CNTF) macrostructure by conversing CO_2 through template-directed chemical vapour deposition. Using this unique network structure and outstanding electrical and mechanical properties of the CNTF, as an example, we demonstrate the excellent electrochemical properties of Ni(OH)_2/CNTF composite. Based on the total mass of the electrode, as high as specific capacitances of 259 and 131 F g"−"1 are obtained at current densities of 0.5 and 10 A g"−"1 respectively. Meanwhile, the electrode also exhibits excellent long cycle life along with 94.0% specific capacitance retained after 2000 cycle tests. Moreover, this template-directed CVD technique is versatile and scalable, and can be a general strategy for fabricating a broad class of three-dimensional macroscopic structures of determined shapes with excellent properties and new uses

[en] Copper is one of the essential trace elements in human body which plays a vital role in the processes of fundamental physiology. Therefore, analysis and detection of copper ions has attracted tremendous attention. In this paper, an electrochemical sensor was successfully developed based on 5-sulfosalicylic acid modified nanocomposite of molybdenum disulfide nanosheets and oxidized multi-walled carbon nanotubes (SSA/MoS₂/o-MWCNTs). The nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy, element mapping, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and electrochemical measurements. Then, nanocomposite-modified glassy carbon electrode was used for the detection of Cu²⁺. Electrochemical analysis of Cu²⁺ was performed by differential pulse voltammetry, and the effects of pH, deposition potential, and deposition time were investigated. The results showed that the peak current increased linearly with increasing Cu²⁺ concentration over the range of 0.1–11 μM and a detection limit of 0.057 μM (S/N = 3). Finally, the developed sensor was applied for the analysis of Cu²⁺ in lake water and dairy products, and the results were consistent with the results of ICP-MS analysis. Therefore, this work demonstrates that the proposed electrochemical sensor can be easily used for the daily monitoring of Cu²⁺.

[en] The interaction process of femtosecond laser pulses with metal photocathodes is studied. Based on the ultrashort electron pulses generated by this process we propose a conceptual design of time resolved electron microscopy. Its feasibility is analyzed, and the problem of control and propagation of the electron pulses discussed. (author)

[en] Highlights: • It proves that the relationship between porosity and spacer content was linear based on theory and practice, that is P = aS_c + b. This model equation can be applicable for the methods that the pores of foams were created by removing a fugitive material. • It indicates that the volumetric change rate of pores (V_R) is a constant and its value altered in different preparing conditions. • Mechanical properties of a foam material can also be predicted by spacer content when using the space holder technique. - Abstract: Titanium foam has been obtained more and more attention due to its combination with porous structure and titanium. The space holder technique was widely used to fabricate this kind of material because of its low cost, easy operation and freely controllable pore structure and properties. However, how to obtain the desired porosities has been a big challenge for this technique, because they are always not equal to the expected ones. Hence, the relationship between porosity (P) and spacer content (S_c) was studied based on theory and practice in this paper. The results show that the relationship between porosity and spacer content was linear, that is P = aS_c + b. It indicates that the volumetric change rate of pores (V_R) is a constant and its value altered in different preparing conditions. Through the research of this paper, the porosity and mechanical properties of a foam material can be predicted by spacer content.