[en] Using the data sample of $711{\mathrm{fb}}^{-1}$ of $\mathrm{\gamma }(4S)$ on-resonance data taken by the Belle detector at the KEKB asymmetric-energy electron-positron collider, we present the first measurements of branching fractions of the decays $B^{-}\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c^{\text{'}0}$, $B^{-}\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c(2645{)}^0$, and $B^{-}\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c(2790{)}^0$. The signal yields for these decays are extracted from the recoil mass spectrum of the system recoiling against ${\overline{\mathrm{\Lambda }}}_c^{-}$ baryons in selected $B^{-}$ candidates. The branching fraction of $B^{-}\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c(2790{)}^0$ is measured to be $(1.1\pm 0.4\pm 0.2)\times {10}^{-3}$, where the first uncertainty is statistical and the second is systematic. The 90% credibility level upper limits on $\mathcal{B}(B^{-}\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c^{\text{'}0})$ and $\mathcal{B}(B^{-}\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c(2645{)}^0)$ are determined to be $6.5\times {10}^{-4}$ and $7.9\times {10}^{-4}$, respectively.

[en] We present the first measurements of the absolute branching fractions of ${\mathrm{\Xi }}_c^{+}$ decays into ${\mathrm{\Xi }}^{-}{\pi }^{+}{\pi }^{+}$ and $p{K}^{-}{\pi }^{+}$ final states. Our analysis is based on a data set of $(772\pm 11)\times {10}^{6}B\overline{B}$ pairs collected at the $\mathrm{{\rm Y}}(4S)$ resonance with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. We measure the absolute branching fraction of ${\overline{B}}^0\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c^{+}$ with the ${\mathrm{\Xi }}_c^{+}$ recoiling against ${\overline{\mathrm{\Lambda }}}_c^{-}$ in ${\overline{B}}^0$ decays resulting in $\mathcal{B}({\overline{B}}^0\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c^{+})=[1.16\pm 0.42(\mathrm{stat}.)\pm 0.15(\mathrm{syst}.)]\times {10}^{-3}$. We then measure the product branching fractions $\mathcal{B}({\overline{B}}^0\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c^{+})\mathcal{B}({\mathrm{\Xi }}_c^{+}\to {\mathrm{\Xi }}^{-}{\pi }^{+}{\pi }^{+})$ and $\mathcal{B}({\overline{B}}^0\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c^{+})\mathcal{B}({\mathrm{\Xi }}_c^{+}\to p{K}^{-}{\pi }^{+})$. Dividing these product branching fractions by ${\overline{B}}^0\to {\overline{\mathrm{\Lambda }}}_c^{-}{\mathrm{\Xi }}_c^{+}$ yields $\mathcal{B}({\mathrm{\Xi }}_c^{+}\to {\mathrm{\Xi }}^{-}{\pi }^{+}{\pi }^{+})=[2.86\pm 1.21(\mathrm{stat}.)\pm 0.38(\mathrm{syst}.)]\%$ and $\mathcal{B}({\mathrm{\Xi }}_c^{+}\to p{K}^{-}{\pi }^{+})=[0.45\pm 0.21(\mathrm{stat}.)\pm 0.07(\mathrm{syst}.)]\%$. Our result for $\mathcal{B}({\mathrm{\Xi }}_c^{+}\to {\mathrm{\Xi }}^{-}{\pi }^{+}{\pi }^{+})$ can be combined with ${\mathrm{\Xi }}_c^{+}$ branching fractions measured relative to ${\mathrm{\Xi }}_c^{+}\to {\mathrm{\Xi }}^{-}{\pi }^{+}{\pi }^{+}$ to set the absolute scale for many ${\mathrm{\Xi }}_c^{+}$ branching fractions.

[en] Based on visual measurement techniques, the real-time robotic welding tracking system achieves real-time adjustment for robotic welding according to the position and shape changes of a workpiece. In system design, the sensor design technique is so important that its performance directly affects the precision and stability of the tracking system. Through initiative visual measurement technology, a camera unit for real-time sampling is built with multiple-strip structured light and a high-performance CMOS image sensor including 1.3 million pixels; to realize real-time data process and transmission, an image process unit is built with FPGA and DSP. Experiments show that the precision of this sensor reaches 0.3mm, and band rate comes up to 10Mbps, which effectively improves robot welding quality.With the development of advanced manufacturing technology, it becomes an inexorable trend to realize the automatic, flexible and intelligent welding product manufacture. With the advantage of interchangeability and reliability, robotic welding can boost productivity, improve work condition, stabilize and guarantee weld quality, and realize welding automation of the short run products [1]. At present, robotic welding has already become the application trend of automatic welding technology. Traditional welding robots are play-back ones, which cannot adapt environment and weld distortion. Especially in the more and more extensive arc-welding course, the deficiency and limitation of play-back welding technology becomes more prominent because of changeable welding condition. It becomes one of the key technology influencing the development of modern robotic welding technology to eliminate or decrease uncertain influence on quality of welding such as changing welding condition etc [2]. Based on visual measuring principle, this text adopts active visual measuring technology, cooperated with high-speed image process and transmission technology to structure a tracking sensor, to realize real-time measurement of the space location and posture information of the work piece and reliable and accurate tracking of the welding seam

[en] Biogas slurry is one of anaerobic fermentations, and biomass fermentation biogas slurries with different compositions are different. This paper mainly presents through the anaerobic fermentation of Eichhornia crassipes solms biogas slurry and biogas slurry of corn straw, the organic components of two kinds of biogas slurry after extraction were compared by TLC, HPLC and spectrophotometric determination of nucleic acid and protein of two kinds of biogas slurry organic components, and analyzes the result of comparison. (paper)

[en] In order to investigate the effect of rotor-stator interaction between impeller and vanes diffuser on the pressure fluctuation of a mixed flow pump, the pressure fluctuations at three representative locations under the design condition are obtained, unsteady flow feature is analyzed by RNG κ–ε turbulence model with sliding mesh technology. Experimental results show that there is the positive slope of head-flow performance curve under 0.6 and 0.85 design condition, which unsteady prediction is not seen based on Reynolds-averaged equation. The pressure fluctuation is analysed by the characteristics of amplitude and frequency, the amplitude of pressure fluctuation, which the maximum is in the rim of impeller outlet and the minimum is in the hub of impeller inlet, is gradually increasing along the hub to rim, the amplitude of monitoring points located the rim of impeller inlet and impeller and vanes diffuser is two times than the hub. The amplitude of pressure fluctuation, which the maximum is in the vanes diffuser outlet, is gradually increasing along impeller inlet to vanes diffuser outlet, while there is a low-frequency pressure fluctuation caused by unsteady flow in the vanes diffuser.

[en] Polyvinyl butyral (PVB) laminated windshield is one of the most important components in automotive to protect vulnerable road users. First, a windshield finite element (FE) model is set up using a piece of interlayer (PVB) sandwiched by two glass layers. Four parameters which have an critical impact on the simulation results, i.e. glass Young's modulus, glass plastic failure strain, PVB stress-strain curve and boundary condition, are suggested to measure the influence on the windshield model. Each windshield model is impacted by a standard headform impactor at the speed of 8m/s based on the LS-DYNA platform and the results are compared with the dynamic experiments of PVB laminated windshield under headform impact to find the most accurate FE model. Furthermore, the most accurate FE windshield model is compacted by the standard headform impactor on various impact velocities (6.6m/s-11.2m/s), angles (60°–90°) compared with the parametric dynamic experiments of PVB laminated windshield to verify the windshield finite element model. This paper provides a useful finite element model of windshield for further systematically numerical studies based on the finite element method to explore the ability of the energy absorption and safety design of PVB laminated windshield

[en] Porous anodic alumina membranes and various nanotips have been demonstrating individually their unique usefulness in current nanotechnology. We present a one-step electrochemical approach to fabricate nanoscale alumina tips (tip-like anodic alumina, TAA) in order to combine the benefits of porous anodic alumina and a nanoscale tip array. The realized TAA has an ordered tip surface with controllable aspect ratio and high sheet density of ∼10¹¹ cm^-2. The formation of alumina nanotips is due to the heat-driven dissolution of the nanopore surface. We have further shown that the surface nanostructure in TAA leads to the wettability reversal, and preferred nucleation and growth during material deposition. The easy and large-scale fabrication of TAA makes it possible for novel nanodevice applications

[en] Varying of the wear-ring clearance not only has a distinct effect on the volumetric loss of the centrifugal pump, but also on the performance of the centrifugal pump including the axial and radial forces. Comparing with the experimental studies, numerical simulation methods have some special advantages, such as the low cost, fast and high efficiency, and convenient to get the detailed structure of the internal flow characteristics, so it has been widely used in the fluid machinery study in recent years. In order to study the effect of wear-ring clearance on the force performance of the centrifugal pump, based on the Reynolds Time-Averaged N-S equations and RNG k-ε turbulence model, a centrifugal pump with three variable styles of the wear-rings was simulated: Only the clearance of the front wear-ring was changed, only the clearance of the back wear-ring was changed and both were changed. Comparing with the experiment, numerical results show a good agreement. In the three changing styles of the clearance, the variable of the clearance of front wear-ring has the most influence on the axial force of the centrifugal pump, while has tiny effect on the radial force for all the conditions

[en] The functional performance, such as magnetic flux leakage, power density and efficiency, is related to the structural characteristics and design technique for the disc permanent magnet synchronous generators (PMSGs). Halbach array theory-based magnetic circuit structure is developed, and Maxwell3D simulation analysis approach of PMSG is proposed in this paper for integrated starter generator (ISG). The magnetization direction of adjacent permanent magnet is organized in difference of 45 degrees for focusing air gap side, and improving the performance of the generator. The magnetic field distribution and functional performance in load and/or unload conditions are simulated by Maxwell3D module. The proposed approach is verified by simulation analysis, the air gap flux density is 0.66T, and the phase voltage curve has the characteristics of a preferable sinusoidal wave and the voltage amplitude 335V can meet the design requirements while the disc coreless PMSG is operating at rated speed. And the developed magnetic circuit structure can be used for engineering design of the disc coreless PMSG to the integrated starter generator. (paper)

[en] Continuous wave (CW) and passively Q-switched (PQS) laser properties at 1062 nm of the Nd:Lu_xGd_3-xGa₅O₁₂ (Nd:LGGG) disordered crystal have been demonstrated. The doping concentrations of Nd³⁺ and Lu³⁺ in the as obtained crystal were measured to be 0.96 and 0.66 at.%, respectively. In the CW regime, the output power of 9.73 W was obtained with an optical-to-optical efficiency as high as 60.7% and slope efficiency of 61.2%. During the passively Q-switched operation, the maximum output power of 1.24 W was achieved under the absorbed pump power of 6.86 W. The maximum peak power of 14.20 kW and single pulse energy of 148 μJ were obtained with the T_oc = 10% under the absorbed pump power of 6.36 W. The results are much better than those obtained with Nd:LGGG crystal doped with 13.6 at.% Lu³⁺ and 0.53 at.% Nd³⁺ ions