[en] We propose a method of rotation angle measurement with high precision in machine vision. An area scan CCD camera, imaging lens, and calibration pattern with a spot array make up the measurement device for measuring the rotation angle. The calibration pattern with a spot array is installed at the rotation part, and the CCD camera is set at a certain distance from the rotation components. The coordinates of the spots on the calibration pattern is acquired through the vision image of the calibration pattern captured by the CCD camera. At the initial position of the calibration pattern, the camera is calibrated with the spot array; the mathematical model of distortion error of the CCD camera is built. With the equation of coordinate rotation measurement, the rotation angle of the spot array is detected. In the theoretic simulation, noise of different levels is added to the coordinates of the spot array. The experiment results show that the measurement device can measure the rotation angle precisely with a noncontact method. The standard deviation of rotation angle measurement is smaller than 3 arc sec. The measurement device can measure both microangles and large angles.

[en] The transfer and development of the PC version of ABAQUS,a large nonlinear mechanical finite element analysis program, are carried out. Some special problem such as difference of the floating data format in different computers and the computer's unusual dead halt during the data transfer is solved and the visualized I/O capability is added in the redevelopment. Thus, by utilizing the visual capability, the intensity of analysis works is reduced, and the correctness of analysis is ensured. The PC ABAQUS are tested by the standard examples from VAX version of ABAQUS and the calculation results are correct. The results of calculation of stress and deformation for CEFR shell structure with PC ABAQUS and ADINA codes agree very well

[en] Factors that affect the detection limit of tritium measurement with liquid scintillation counter are identified, screened and analyzed quantitatively in this article. With adoption of electrolysis enrichment, an optimized solution to lowering detection limit is presented. Above influential factors are verified individually by well designed experiments. It shows that the detection limit could be reduced to 0.87 Bq/L by choosing counting channels, background water, material of vial, ratio of sample and cocktail adequately without increasing workload, and further to 38. 5 mBq/L if electrolysis enrichment process is used. (author)

[en] Highlights: • Energy harvesting potential of commercialized piezoelectric tiles is analyzed. • The parameters which will affect the energy harvesting efficiency are determined. • The potential could cover 0.5% of the total energy usage of the library building. • A simplified evaluation indicator is proposed to test the considered paving area. - Abstract: In this paper, potential application of a commercial piezoelectric energy harvester in a central hub building at Macquarie University in Sydney, Australia is examined and discussed. Optimization of the piezoelectric tile deployment is presented according to the frequency of pedestrian mobility and a model is developed where 3.1% of the total floor area with the highest pedestrian mobility is paved with piezoelectric tiles. The modelling results indicate that the total annual energy harvesting potential for the proposed optimized tile pavement model is estimated at 1.1 MW h/year. This potential energy generation may be further increased to 9.9 MW h/year with a possible improvement in piezoelectric energy conversion efficiency integrated into the system. This energy harvesting potential would be sufficient to meet close to 0.5% of the annual energy needs of the building. The study confirms that locating high traffic areas is critical for optimization of the energy harvesting efficiency, as well as the orientation of the tile pavement significantly affects the total amount of the harvested energy. A Density Flow evaluation is recommended in this study to qualitatively evaluate the piezoelectric power harvesting potential of the considered area based on the number of pedestrian crossings per unit time

[en] Due to high occupant density, fresh air is essential for audience in a concert hall. Generally, mechanical ventilation system is used to supply outdoor fresh air. Apart from that, uncontrolled air leakage across building exterior (i.e., air infiltration) is also a source of outdoor fresh air. Though ASHRAE requires a positive pressure (i.e., zero infiltration rate) for mechanically ventilated rooms, positive pressure is difficult to be maintained under poor building airtightness or low mechanical ventilation rates. When the positive pressure is not achieved, the existence of air infiltration brings about outdoor air pollutants infiltrating indoors and excessive fresh air cooling/heating load. Therefore, to maintain a good indoor environment and an appropriate fresh air rate, the effect of mechanical ventilation on air infiltration rate must be figured out. This study investigates the variation laws of infiltration rate with mechanical ventilation rate in a concert hall. Infiltration rates under different mechanical ventilation rates were measured based on the particle mass balance method. It is concluded that the relationship between the two rates conforms to the theoretical model proposed by the authors’ previous study. (paper)

[en] The TnT (troponin) concentration in 31 children patients with congenital cardiac disease both before and after operation was measured. The result shows that the TnT concentrations increase remarkably after operation and become normal gradually. The TnT concentration can indicate recovery process of the cardiac muscles after surgery

[en] The full valence complete active space self-consistent field (CASSCF) method followed by the highly accurate valence internally contracted multireference configuration interaction (MRCI) approach has been employed to investigate the potential energy curves (PECs) for X²Σ⁺, A²Π and B²Σ⁺ of CP and X¹Σ⁺ electronic states of CP^-. In the present calculations, the basis sets used are correlation-consistent basis sets, aug-cc-pV5Z. The PECs determined by the MRCI calculations are corrected for size-extensivity errors by means of the Davidson modification (MRCI+Q). To obtain more reliable results, effects on the PECs by the core-valence correlation and relativistic corrections are taken into account. The core-valence correlation correction is carried out with the cc-pV5Z basis set. The way to consider the relativistic correction is to use the second-order Douglas-Kroll Hamiltonian (DKH2) approximation, and the correction is performed at the level of cc-pV5Z basis set. Then the PECs of electronic states involved are extrapolated to the complete basis set limit. With the PECs, the spectroscopic parameters (T_e, R_e, ω_e, ω_ex_e, ω_ey_e, α_e and B_e) of these three electronic states are determined and compared in detail with those reported in the literature. Comparison with the experimental data shows that the present spectroscopic parameters are more accurate than the previous calculations. (authors)

[en] This study proposes a new frictional algorithm that implements angular increment. The proposed algorithm is used to solve the numerical solutions of dynamic problems in two-dimensional frictional systems. It can accurately obtain the motion responses of a lumped mass under time-varying external forces, and it can compensate for the shortcomings of the numerical frictional algorithm that implements a time step. Specifically, the proposed algorithm 1) overcomes the difficulties encountered when the angles between resultant tangential forces and slip motion are infinitely close, 2) provides accurate solutions for two-dimensional systems under fierce planar motions, and 3) calculates the responses of the mass within a reasonable period. We compare the computation accuracy, efficiency, and robustness of the proposed frictional algorithm and the previous frictional algorithm through several representative scenarios. We reveal that the proposed algorithm has superior computation accuracy, efficiency, and robustness for two-dimensional frictional problems involving slip/stick transitions and sharp bending.

[en] Objective: To detect the method of reversing tumor multidrug resistance, and study the expression of colorectal carcinoma MDR1 genetic expression product P-glycoprotein (P-gp) in irradiated HCT-8 cells with different dose ionizing radiation. Methods: Flow cytometry was used to detect the change of P-gp. Results: positive cells percentage of P-gp increase obviously (P<0.01) after irradiated with 2Gy. When pre-irradiated with low dose (0.05Gy, 0.1 Gy), then irradiated with high dose, positive cell percentage of P-gp increase obviously (P<0.05), and so dose the positive cell percentage of P-gp (P<0.01) in the group of 0.2Gy + 2Gy. Compared with the group of 2Gy, positive cell percentage of P -gp decreases obviously (P<0.05) in the group of 0.1 Gy + 2Gy. Conclusion: low dose ionizing radiation can reverse radiogenic tumor multidrug resistance with high dose. (authors)

[en] The Bi-Ni and Bi-Ni-Mn composite is separately coated on the surface of commercial electrolytic manganese dioxide (EMD) by using a simple chemical precipitation/oxidation method. The results of X-ray diffraction show that a structure of γ-MnO_2 is kept for all the coated EMD, but the intensity of their diffraction peaks is lower than uncoated one. Both the Bi_0_._5-Ni_0_._5 and Bi_0_._3_5-Ni_0_._3_5-Mn_0_._3 composite benefits the discharge capacity and high-power performance of the EMD electrodes. On the other hand, the results of scanning electron microscopy and energy dispersive spectroscopy confirm the more uniform distribution of the Bi_0_._1_5-Ni_0_._5_5-Mn_0_._3 composite on the surface of EMD than the Bi_0_._5-Ni_0_._5 one, thereby resulting in better cyclability of the electrodes. After 50 cycles at a 1C rate, the capacity retention rate of the Bi_0_._1_5-Ni_0_._5_5-Mn_0_._3 composite-coated electrode reaches to 80%, which is far larger than the un-coated (49%) and the Bi_0_._5-Ni_0_._5 composite-coated (63%) one