[en] 3D single particle coherent diffraction imaging (CDI) of bioparticles (such as proteins, macromolecules and viruses) is one of the main possible applications of the new generation of light sources: free-electron lasers (FELs), which are now available at FLASH (Hamburg, Germany) and LCLS (Stanford, U.S.A.). The extremely bright and ultrashort FEL pulses potentially enable CDI to achieve high resolution down to subnanometer length scale. However, intense FEL pulses cause serious radiation damage in bioparticles, even during single shots, which may set the resolution limits for CDI with FELs. Currently, since the signal-to-noise ratio is very low for small biological particles, direct experimental study of radiation damage in the single particle imaging is fairly difficult. Single atomic (noble gas) clusters become good objects to reveal effects of radiation damage processes on CDI with FEL radiation. This thesis studies three aspects of the radiation damage problem, which are treated in three independent chapters: (1) Molecular Dynamics simulations to quantitively describe radiation damage processes within irradiated atomic clusters during single pulses; (2) reconstruction analysis of single-shot CDI diffraction patterns of atomic clusters, which may potentially help to understand the radiation damage occurring in biological samples; and (3) testing the effects of coating water layers in CDI, which is supposed to minimize the radiation damage in irradiated bioparticles. (orig.)

[en] To lower the cost of passive gravity navigation and dynamic gravity measurement, a rate azimuth inertial platform with a gravity sensor on it was put forward to compose a navigator with gravity measuring. Some research about this rate azimuth platform inertial navigation system was carried out, the rate azimuth horizontal reference frame and actual platform reference frame were set up, the error equationuations, which including position error, velocity error, platform angle error, course error were put up, which would contribute to the integrated system, and the simulation of error for the rate azimuth inertial platform was shown of system errors was shown. (paper)

[en] The authors study the decay widths of the narrow resonances D_sj^*(2317) and D_sj(2460) in the chiral quark model, together with the well-known D^* and D_s^* mesons. All the parameters in our calculation are taken from Godfrey and Isgur's quark model except the π⁰-η mixing angle which is fixed by the D_s^* decay widths. The calculated electromagnetic decay widths agree with those from other groups and the experimental data available quite well. However, the pionic decay widths of D_sj(2317) and D_sj(2460) are too small to fit the experimental data. The authors suspect that the simple chiral quark pion axial-vector interaction Hamiltonian is not suitable for hadron strong decays of D_sj(2317) and D_sj(2460). (authors)

[en] Objective: To investigate the factors which affect the therapeutic efficacy of percutaneous cervical diskectomy (PCD) on cervical disc protrusion (CDP). Methods: 21 cases with CDP treated by PCD were analyzed and reviewed. After evaluating the efficacy, the mechanism of PCD were discussed. Results: The successful rate reached 100%. Some excellent results were obtained in 20 cases without significant complication. Conclusions: PCD is safety without any influence to the stability of human cervical spine

[en] Two anti-CEA monoclonal antibodies are used, one is coated on tubes, and the other is labeled with ¹²⁵I to prepare ¹²⁵I-CEAMcAb. The one-step assay is established based on immunoradiometric assay (IRMA). The sensitivity of the assay is 0.5 μg/L. The intra-assay CVs and the inter-assay CVs are lower than 10.0% and 15.0%, respectively. The analytical recoveries are 97.4%-108.9%. The reference cut-out value of normal serum (n=35) is lower than 10.0 μg/L

No abstract available

[en] New glass–ceramic/ceramic composites based on lead-free low-softening La₂O₃–B₂O₃–Al₂O₃ (LBA) glass–ceramics and Al₂O₃ fillers were prepared. The phase compositions, microstructure, and dielectric properties of the composites were investigated. LaBO₃, La(BO₂)₃ and LaAl_2.03(B₄O₁₀)O_0.54 including Al₂O₃ fillers were developed in the LBA glass–ceramics/alumina composites sintered at 875 °C, but the relative amounts of the phases varied greatly with different glass–ceramic compositions and were considered to be determined by the ratio of La₂O₃ to B₂O₃. The onset sintering temperatures of green composites were ~ 670 °C and the sintering shrinkage of the samples was mainly determined by the low-softening glass–ceramics. Optimum properties were exhibited for the composite of 25 La₂O₃–65 B₂O₃–10 Al₂O₃ glass–ceramic with 40 wt% Al₂O₃ sintered at 900 °C with a permittivity ε_r = 7.91, a dielectric loss tan δ = 2.12 × 10⁻³ (at 8.1 GHz). The low ε_r and tan δ coupled with a low sintering temperature, suggested that the LBA glass–ceramic/Al₂O₃ composites were potential candidates for LTCC applications.

[en] To have a better understanding on the characteristics of La₂O₃–B₂O₃–CaO (LBC) glass–ceramics designed for low temperature co-fired ceramic applications, LBC glass–ceramics with La/B ratio changing from 1:6.0 to 1:3.0 were prepared, and the network structure, sinterability, crystalline phase composition and crystallization kinetics of synthesized LBC glass–ceramics were investigated. The increase of La/B ratio would reduce the content of [BO₄] units in the network structure, and decrease the glass transition temperature as well as the softening temperature of LBC glass–ceramics. But low La/B ratio of glass could cause serious foaming during sintering process. The change of La/B ratio would influence the position as well as intensity of crystalline peaks on DSC curves, and the composition and microstructure of crystalline phases were also affected. The crystallization activation energies of LBC glass–ceramics were 157.9–498.7 kJ/mol, which raised up with the increase of La/B ratio.

[en] The sintering densification behaviors and crystallization characteristics of CBS glass have been investigated systematically, and a new CBS glass composite system containing two types of CBS glass is reported. The results demonstrated that the sintering densification characteristic of single CBS glass and CBS composite could be divided into two stages: the fast and slow densification stage. The temperature range of the fast densification stage of single CBS glass is quite narrow (680–710 °C), while CBS composite gets a wider one (680–730 °C). In result, more moderate sintering densification process, which benefits the co-firing compatibility with electrode materials, is obtained in CBS composite. The major crystalline phases of the CBS glass and CBS composite were CaSiO₃ and CaB₂O₄. CBS glass sintered at 910 °C for 10 min exhibited excellent microwave dielectric properties of dielectric constant value of 6.4 and quality factor value of 11,110 GHz, while CBS composite showed dielectric properties of dielectric constant value of 6.1 and quality factor value of 10,640 GHz, which meets the requirements for LTCC applications.

[en] Coupling high-quality suspended atomic membranes to specialized electrodes enables the investigation of many novel phenomena, such as spin or Cooper pair transport in these two-dimensional systems. However, many electrode materials are not stable in the acids that are used to dissolve underlying substrates. Here we present a versatile and powerful multilevel lithographical technique to suspend thin crystals, which can be applied to the vast majority of substrate, crystal and electrode materials. Using this technique, we fabricated suspended graphene devices with Al electrodes and a mobility of 5500 cm² V^-1 s^-1. We also demonstrate, for the first time, fabrication and measurement of a free-standing thin Bi₂Se₃ crystal, which has low contact resistance to electrodes and a mobility of ∼>580 cm² V^-1 s^-1.