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Homing is a particularly important step to establish the equipment coordinate origin. A reliable method of fast homing based on the PLC system in the automatic production line is discussed, which obtains the position information of each motion axis through Modbus or other networks, and cooperates with PLC’s Homing instruction to static home quickly to avoid complex operations. And the function of returning to the breakpoint in the middle process is proposed, which makes it easy to resume production in the event of power failure or overload, and greatly improves production efficiency. And the above research is transformed into a practical system, which has been verified and has the value of promotion.

Main text The CCQM-K172 key comparison on measurement of Specific Adsorption A [mol/kg] of Ar on zeolite at liquid argon temperature (to enable a traceable determination of the Specific Surface Area by following ISO 9277) has been performed by the Surface Analysis Working Group (SAWG) of the Consultative Committee for Amount of Substance (CCQM). The objective of this key comparison is to compare the equivalency of the National Metrology Institutes (NMIs) and Designated Institutes (DIs) for the measurement of specific adsorption of Ar, BET specific surface area) of microporous substances (zeolites, sorbents, ceramics, catalytic agents, etc) used in advanced technology. In this key comparison, a commercial zeolite was supplied as a sample. Five NMIs/DIs participated in this key comparison. All participants used a gas adsorption method, here argon adsorption at 77.3 K, for analysis according to the international standard ISO 9277. In this key comparison, the degrees of equivalence uncertainties for specific adsorption argon, BET specific surface area were established. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

A single-photon interferometer is a fundamental element in quantum information science. In most previously reported works, single-photon interferometers use an active feedback locking system to stabilize the relative phase between two arms of the interferometer. Here, we use a pair of beam displacers to construct a passively stable single-photon interferometer. The relative phase stabilization between the two arms is achieved by stabilizing the temperature of the beam displacers. A purely polarized single-photon-level pulse is directed into the interferometer input port. By analyzing and measuring the polarization states of the single-photon pulse at the output port, the achieved polarization fidelity of the interferometer is about 99.1±0.1%. Our passively stabilized single-photon interferometer provides a key element for generating high-fidelity entanglement between a photon and atomic memory.

High-accuracy localization is a major problem for intelligent vehicles. With the continuation of traffic scenarios, underground parking lots have become an essential link to intelligent vehicle localization. Current localization methods suitable for ordinary traffic scenes, such as the global localization system and Beidou, cannot obtain stable localization results because the satellite signal is blocked. Thus, localization is a complex problem to solve in this scenario to achieve highly accurate localization. This study proposes a coarse-to-fine multi-scale localization method that can achieve highly precise localization with only one monocular camera based on the constructed multilayer map. First, the visual features of the images to be located are extracted, and the proposed features are counted and matched with the map using the bag of word model to obtain the nearest node for completing node-level coarse localization. Second, the perspective N-point problem model is formed using visual features and structural information in the nearest node. Finally, the positions and attitudes of the vehicles relative to the map node are calculated to complete degree-level fine localization. The error rate of the localization algorithm is verified to be below 7.3%, which is superior to that of other methods. This study provides a new solution for the highly accurate localization of underground parking and other indoor scenes.

A novel dual-band dual-circularly polarized waveguide slot array antenna is designed. The antenna opens two orthogonal slots with different lengths on the standard waveguide and is excited at two frequencies. The electric fields of TE10 and TE01 modes are obtained. To achieve the purpose of dual-band dual-circular polarization. Two orthogonal slots can not only make the antenna elements have slow-wave properties and delay phase, but also make the antenna elements in different frequency bands have the same virtual short-circuit wall, which simplifies the difficulty of design and processing. The antenna can achieve an equidistant array and become an array antenna. Through simulation verification, the S11

Blind quantum computation allows a client without enough quantum technologies to delegate her quantum computation to a remote quantum server, while keeping her input, output and algorithm secure. In this paper, we propose a universal single-server and almost-classical-client blind quantum computation protocol. In this protocol, the client interfaces with only one server and the only ability of the client required is to get particles from the trusted center and forward them to the server. We present an analysis of this protocol and modify it to a universal single-server and fully-classical-client blind quantum computation protocol by improving the ability of the trusted center. Based on our protocols and recent works, a new "Cloud + Certificate Authority (CA)" style is proposed for the blind quantum computation., Comment: 7 pages, 3 figures, Close to the published version

In this work, we reported the room-temperature continuous-wave operation of 6.0 W GaN-based blue laser diode (LD), and its stimulated emission wavelength is around 442 nm. The GaN-based high power blue LD is grown on a c-plane GaN substrate by metal organic chemical vapor deposition (MOCVD), and the width and length of the ridge waveguide structure are 30 and 1200 μm, respectively. The threshold current is about 400 mA, and corresponding threshold current density is 1.1 kA/cm2.