[en] Large deployable antennas are widely used in aerospace engineering to meet the envelop limit of rocket fairing. The high flexibility and low damping of antenna has proposed critical requirement not only for stability control of the antenna itself, but also for attitude control of the satellite. This paper aims to increase controllability of a large flexible antenna by modal optimization. Firstly, Sensitivity analysis of antenna modal frequencies to stiffness of support structure and stiffness of scanning mechanism are conducted respectively. Secondly, Modal simulation results of antenna frequencies are given, influences of scanning angles on moment of inertia and modal frequencies are evaluated, and modal test is carried out to validate the simulation results. All the simulation and test results show that, after modal optimization the modal characteristic of the large deployable antenna meets the controllability requirement well. (paper)

[en] In order to alleviate volume changes of silicon monoxide during lithium insertion and improve its electrical conductivity, ball milling(bm)-SiO_x/(Cu,Ni) lithium-ion battery anode materials are successfully prepared by depositing copper and nickel on the surface of silicon nanoclusters of silicon monoxide by electroless plating. The composition and morphological characteristics of the prepared materials are characterized by XRD, XRF, XPS, TEM, and EDS, and the electrochemical performance behavior of the materials are investigated by electrochemical tests. The results show that when the particle size of SiO_x is reduced from 1.7 μm to less than 200 nm by ball milling, its initial specific capacity and reversible specific capacity can be significantly improved. The deposited Cu/Ni contents of bm-SiO_x/(Cu,Ni) can be controlled by adjusting the concentration of Cu²⁺/Ni²⁺ in the plating solution. Both bm-SiO_x/Cu and bm-SiO_x/Ni can improve the initial discharge specific capacity, cycling stability, and rate performance. Bm-SiO_x/Cu with a Cu content of 4.76% and bm-SiO_x/Ni with a Ni content of 4.29% have the best electrochemical performance. Compared with bm-SiO_x/Cu (4.76%), bm-SiO_x/Ni (4.29%) has better electrochemical performance; at 0.1C rate, its initial discharge specific capacity can be achieved 2199 mAh/g. After 50 cycles, its reversible specific capacity is 1339 mAh/g.

[en] Background: Because of the damage induced by ionizing radiation, bipolar transistors in integrated voltage regulator could induce the current gain degradation and increase leakage current. This will bring serious problems to electronic system. Purpose: In order to ensure the reliability of the device work in the radiation environments, the device irradiation reinforcement technology is used. Methods: The characteristics of "6"0Co γ irradiation and annealing at different temperatures in bipolar transistors and voltage regulators (JW117) with different passive films for SiO_2+BPSG+SiO_2 and SiO_2+SiN have been investigated. Results: The devices with BPSG film enhanced radiation tolerance significantly. Because BPSG films have better absorption for Na"+ in SiO_2 layer, the surface recombination rate of base region in a bipolar transistor and the excess base current have been reduced. It may be the main reason for BJT with BPSG film having a good radiation hardness. And annealing experiments at different temperatures after irradiation ensure the reliability of the devices with BPSG films. Conclusions: A method of improving the ionizing irradiation hardness of bipolar transistors is proposed. As well as the linear integrated circuits which containing bipolar transistors, an experimental basis for the anti-ionizing radiation effects of bipolar transistors is provided. (authors)

[en] The newly built SECRAL II (Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou II) is a multi-purpose intense highly charged ion source and is of great significance at Institute of Modern Physics (IMP). The control system is an important subsystem of SECRAL II. In this paper, we implement a control system for SECRAL II. In order to achieve high quality control, we have presented and followed some useful control concepts. The control system can perform control and monitor of all devices. Besides, it can also complete data store, alarms, interlocks and human safety. In all, the control system effectively supports the operation for SECRAL II. The control system was completed and put into operation in June 2016. The control system has successfully worked for about 11000 hours. During this process, the hardware works normally and without trouble. The control software has a low failure rate (5.5×10-4/hour) and its MTTR (Mean Time to Repair) is less than 30 minutes. Since then, SECRAL II has set many world records in the field of ECR ion source. (paper)

[en] In this paper a new class of shunted electromagnetic damping treatment is proposed: a non-contact electromagnetic shunt damper (NC-EMSD). The NC-EMSD consists of an electromagnet attached to a host structure, a permanent magnet attached to the fixed boundary and an electrical impedance connected to the terminals of the electromagnet. The electromagnet and the shunt impedance constitute a closed circuit. When the structure vibrates, an induced electromotive force will be produced and results in the electromagnetic force as damping force, which can suppress the vibration of the structure. The model of NC-EMSD is built up based on the equivalent current method. The governing equations of the beam with NC-EMSD are established using Hamilton's principle. The capacitor-matching-inductance (CMI) method and the negative resistive capacitor-matching-inductance (NR-CMI) method are proposed, respectively. Then the vibration control of a cantilever beam with NC-EMSD is simulated and measured by CMI and NR-CMI control methods, respectively. The results show that both the CMI and NR-CMI can attenuate the vibration effectively, and the NR-CMI provides much better control performance than that by CMI. It is indicated as well from the studies that the decrease of either the gap between the magnet pair or the resistance of the shunt impedance contributes to the improvement of control performance

[en] The control system upgrade of the 320 kV heavy ion multidisciplinary research facility was studied in this paper. The upgraded control system was based on distributed system model. Serial port server, programmable logic controller (PLC) and servo motors were used to control and monitor all devices remotely. By building up EPICS IOC dynamic database, all controlled devices were integrated together seamlessly. As to operator interface, control system studio (CSS) toolkit was adopted to access all controlled devices transparently. This upgraded control system has been running for more than 10000 h. At present, the control system runs steadily and reliably, which fully meets the requirements of 320 kV heavy ion multidisciplinary research facility and physical experiment. (authors)

[en] Full text: Chalcogenide glasses have been intensively investigated during the last several decades due to their potential applications in many fields such as information storage and integrated optics. Recently significant achievements have been made regarding the understanding of microscopic mechanism of some photo-induced effects. However, the nature of many intriguing phenomena in these glasses is not well understood. In this report, the phenomena of photoinduced transmitting change and photoinduced second harmonic generation in chalcogenide glass were focused. Based on the detailed structural characterization before and after irradiation, together with corresponding theoretical analysis, the origin of the above-mentioned photoinduced phenomena in chalcogenide glass is proposed. (author)

[en] FECR ion source is replaced with LAPECR ion source temporarily for other components performance testing in LEAF. LAPECR ion source can afford intense low charge state or medium charge state ion beams. This paper introduces the control system which comprises software, hardware and the interlock system. The control system is based on EPICS and the device supports are developed in Linux. CSS is utilized as the Operator Interface. Commercial controllers and PLCs are adopted to control devices, acquire experimental data and create interlock system. At present, LAPECR ion source has provided beam (150 μA, ⁴H^1+, 0.5Mev) for RFQ outlet. This control system can work stable and interlock system can effectively protect equipment from damage. (paper)

[en] Monodisperse organic functionalized silica micro/nano spheres have been extensive research due to their special structural features. In this study, the Monodisperse organic functionalized silica micro/nano spheres were prepared by one-step hydrolysis condensation reaction of organosilane including TCPTES, MPTES, CTES, CPTES, UPTES in microemulsion system. It was showed that it was no particles from UPTES in the presence of SDS, and organic silica spheres prepared with CTES and CPTES had uniform particle size and monodispersity. However, organic silica spheres with poor disperse can be obtained from UPTES in the presence of CTAB, due to the physical adsorption between charges. In the contrast with SDS system, other organic silica spheres had poor disperse and nonuniform particle size. (paper)

[en] Power supply monitoring system provides important real-time data for machine research, auto beam adjustment and deep learning on HIRFL (Heavy Ion Research Facility Lanzhou). During the EPICS upgrade of HIRFL, the power supply monitoring system was redesigned and a distributed structure was adopted to form an extended layout of the upper layer/middle ware and the bottom layer. The middle ware processes the upper layer data and sends data to the lower layer, avoiding invalid parameters applied to the lower devices and simplifying the handling of exception. To facilitate beam adjustment, the display interface is integrate, displaying large amounts of data on different OPI is optimized and the display is improved. In order to carry on the off-line analysis of the data, a NoSQL database cluster was built to realize multiple copies of high priority data and to store multi-node real-time data, also to improve data security and database read/write speed, in addition to avoid designing complicated table structure and to expand database cluster optimization and nodes increasing. (authors)