Palaeogeothermal response and record of the effusing of Emeishan basalts in the Sichuan basin

Thermal history of the Sichuan basin is reconstructed based on vitrinite reflectance from boreholes in the basin using a paleo-heat flow method.The results show that the Sichuan basin experienced a relatively low heat flow period in the Early Paleozoic,and an elevated paleo-heat flow,ranging 60-80 mW/m2 with a maximum as high as 100 mW/m2 around 259 Ma,from the beginning of the Late Paleozoic to the end of the early Permian,and a decreased paleo-heat flow from the late Permian to the late Triassic,and then ...     

Influence of the cobalt concentration on optical and magnetic properties of zinc oxide

A series of Co-doped ZnO thin films have been prepared by direct current reactive magnetron sputtering on glass substrates.The structural characterization by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM) gave no evidence of second phase formation.The qualitative composition and chemical state were characterized by energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectronic spectrometry (XPS),respectively.The results confirmed that Co was incorporated as Co3+,occupying the ...     

A DNA length reducing computing model for maximum independent set problem

In this paper, a new molecular computing model is developed to solve the maximum independent set problem, based on the method of DNA length reducing. To solve the maximum independent set problem with n-vertices and m-edges, the time complexity is O(n+m). With the enlargement of the problem scale, the numbers of the required tubes will increase linearly. Two important methods in this experiment are single strand DNA (ssDNA) circularization and DNA length reducing. In addition, using reverse polymerase chain reaction (PCR) and circligase, the structure of DNA molecules is changed in each computing step, transforming from linear double strand DNA (dsDNA) to linear ssDNA and circular ssDNA. Using the circular DNA structure, the recombina-tion among DNA molecules is avoided. To verify this computing model, a small maximum independent set problem was solved.     

The determination of atmospheric phosphine in Ny-Ålesund

Phoshpine (PH3), a volatile and toxic gas, has been proved to commonly exist in the environment. The determination of gaseous phosphine and its emission fluxes in Ny-Ålesund is reported in this paper. Results showed that gaseous phosphine exist in Arctic atmosphere commonly and the concentration of phosphine ranged from 16.3–600.2 ng/m³, with the maximum concentration of phosphine in tundra areas and the minimum in surface air of ocean. The concentration of phosphine ranged from 65.79–1259 ng/m³ in colliery atmosphere at different altitudes and the maximum was found in the center of colliery. Emission fluxes of phosphine were different in various Arctic areas. Emission fluxes of phosphine from protected areas, with average concentration of 32.13±5.353 ng m^–2 h^–1, were higher than from other areas. And the flux of phosphine from ocean was lower.     

Chiral <Emphasis Type="Italic">N</Emphasis>-formyl amino alcohol as Lewis basic organocatalyst for enantioselective hydrosilylation of ketimines

Easily accessible (1R,2S)-1,2-diphenyl-2-formamidoethanol has been developed as an effective Lewis base catalyst in the enanti-oselective hydrosilylation of ketimines, affording high isolated yields (up to 94%) and moderate to high enantioselectivities (up to 82% ee) for a broad range of ketimines.     

Entanglement dynamics and transfer in a double Jaynes-Cummings model

We study the entanglement dynamics for a double Jaynes-Cummings model where two entangled atoms A and B locally interact with independent cavities a and b, respectively, but there are no interactions between locations Aa and Bb. We point out that there exists a parameter range in which simultaneous pairwise entanglement sudden death (ESD) for remote parties, i.e. AB, ab, Ab and Ba, may occur. We show that during this simultaneous ESD period various multipartite entanglement can be created. Our results imply that the pairwise entanglement between two independent locations may be transferred into other multipartite forms which account for the correlations between the two independent locations.     

Indoor SVOC pollution in China: A review

Epidemiological and toxicological studies have proved that semi-volatile organic compounds (SVOCs) may have significant adverse effects on human health.For example,phthalic acid esters (PAEs),polybrominated diphenyl ethers (PBDEs) and polycyclic aromatic hydrocarbons (PAHs) may harm the endocrine,reproductive and respiratory systems of humans.Moreover,some SVOCs are carcinogenic.This paper summarizes the source emission characteristics for typical SVOCs observed indoors,evaluates the gas-phase and particle-...     

Built-in electric field influence on impurity-free vacancy disordering of InGaAs/InP quantum well structure

Built-in electric field may enhance or retard the impurity-free vacancy disordering (IFVD) during rapid thermal annealing (RTP) by imposing a drift on charged point defects. Built-in electric field is at the interface between dielectric layer and top layer of the structure. Subsequent rapid thermal annealing leads to different intermixing results due to different field directions on InP cap layers in different doping types. Experimental results also show different influences of the built-in field on the two...     

A wide tuning range electro-optic filter based on long-period waveguide grating

We present the design of an electro-optic filter with polarization insensitivity based on a long period waveguide grating. The filter exhibits an ultra-large wavelength tuning range of exceeding 35 nm and covering the whole C band (1530 to 1565 nm) in a bias voltage range from −84 to 84 V. In the whole tuning range, the transmission coefficients for quasi TE modes are over 97% and the 3 dB bandwidths are below 0.8 nm. The wavelength sensitivity to the tunable voltage is about 0.208 nm/V. This electro-optic filter can be used in dynamic WDM networks for fast wavelength scanning/selection, communication channel reconfiguration, and optical switching.     

Rupture process of the Wenchuan <Emphasis Type="Italic">M</Emphasis>8.0 earthquake of Sichuan China: the segmentation feature

Moment tensor solution, rupture process and rupture characteristics of the great Wenchuan M8.0 earthquake are studied by using 39 long-period P and SH waveforms with evenly azimuth coverage of stations. Our results reveal that the Wenchuan M8.0 event consisted of 5 sub-events of Mw≥7.3 occurring succesively in time and space. Rupture started with a Mw7.3 introductory strike-slip faulting in the first 12 s, then within 12?40 s, two sub-events with Mw7.6 and Mw7.4 occurred within 80 km northeast from the init...