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To acquire a further utilization of mulberry seed, antioxidant peptides derived from defatted mulberry seed protein was prepared using a continue-flow microreactor with the synergistic effects of immobilized protease and nontoxic ionic liquid. The mulberry seed meal was pretreated with the combined simultaneous ultrasound treatment at a frequency combination of 20/28/40 kHz, solid–liquid ratio of 1:30, output power of 400 W, and temperature of 40 °C; the extraction rate of mulberry seed protein was up to 70.1%, 21.54% higher than that obtained with the single-frequency ultrasonic treatment (p< 0.05). The hydrolysis process of mulberry seed protein in the continue-flow microreactor was catalyzed by the immobilized protamex combined with choline chloride, the flow rate was 2.5 mL/min, the temperature was 50 °C, and the hydrolysis rate was up to 83.33%, which was 1.14 times higher than that without ionic liquid. Moreover, the immobilized protease can be used 12 times under continue-flow condition, and the enzyme activity was still more than 80% of the original enzyme. Four antioxidant peptides including AMDGK (896.24 Da), KFRAKDG (1109.47 Da), FPSNEPLLG (1287.15 Da), and SNVPNKEL (1005.14 Da) were obtained by ionic liquid-enhanced microfluidic hydrolysis with immobilized protease from mulberry seed protein, and AMDGK had not been reported before. These peptides exhibited strong scavenging activities on 2,2-diphenyl-1-picrylhydrazyl radical (DPPH˙) (EC50were 2.64, 1.89, 2.16, and 1.34 mg/mL, respectively) and superoxide anion radicals (·O2−) (EC50were 3.36, 2.78, 2.56, and 1.77 mg/mL, respectively). Thus, the defatted mulberry seed protein possesses good edible development potential and economic value in the production of antioxidant peptides.

The lead-free ceramics (1−x)(0.94Bi0.47Na0.47Ba0.06TiO3-0.06BiAlO3)-xAgNbO3(denoted as BNBTA-xAN) were synthesized via a solid-state sintering method. The effect of AgNbO3doping amount on dielectric properties of the ceramics was studied systematically. X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman spectroscope were used to detect the structure of the ceramics. Temperature-dependent dielectric spectra, frequency-dependent dielectric constant and alternating current (ac) electric conductance at various temperatures were measured. The doping of AgNbO3greatly reduces dielectric constant around Curie temperature and thus enhances the temperature stability of the dielectric constant. The ceramic BNBTA-0.03AN exhibits excellent temperature-stable dielectric properties with temperature coefficient of capacitance (TCC) ≤±15% between 55∘C and 418∘C with temperature window 363∘C and small changes of dielectric constant and dielectric loss from 100 Hz to 1 MHz at different temperatures. The obtained ceramics are expected to be used in high-temperature capacitors due to its excellent temperature stability.

AbstractCombined digital filters are the basis of fault selection and identification in electric microprocessor protection. The commonly used combined digital filters based on wavelet transform cannot eliminate the interference components of traditional filter, resulting in low reliability of electric microcomputer protection. To this end, a design method of combined digital filter for electric microcomputer protection is proposed based on distributed algorithm. First, the combined digital filter and each implementation module are designed. Then, the principle of distributed algorithm is introduced, and realization of distributed algorithm is analysed, so as to realize the design of combined digital filter. The experimental results show that calculation of the filter designed by this method is simple and effective, and the development of electric microprocessor protection is promoted.

This paper investigates the complex controlled object. A method of fuzzy-network is proposed. Results of simulation research show that the controller has not only high self-study ability, but also high robustness, and let the performance in AC speed adjustment system quickly improve.

Dense (Na0.5K0.5)NbO3lead-free ceramics with the simple composition were prepared via sintering in low oxygen partial pressure (pO2, ∼10−12atm) atmosphere and adding LiF. All the ceramics have pure orthorhombic structure. Compared to the LiF-added (Na0.5K0.5)NbO3ceramics sintered in air and the low pO2-sintered pure (Na0.5K0.5)NbO3ceramics without LiF addition, the present ceramics exhibit improved piezoelectric and ferroelectric properties. The piezoelectric constant d33is 125 pC/N, and the converse piezoelectric constant d33* is 186 pm/V. The dielectric constant and dielectric loss of the ceramics at room temperature and 1 kHz are 451 and 0.03, respectively. Under the measured electric field of 70 kV/cm, the remanent polarization is 25.9 μC/cm2and the coercive field is 13.9 kV/cm. Furthermore, if the base metals such as Cu and Ni powders were mixed into the green pellets and sintered in the low pO2atmosphere, the base metals cannot be oxidized, suggesting possibility of using base metals as electrodes.

We have demonstrated a passively mode-locked diode end-pumped all-solid-state laser, which is composed of a Nd:Gd_0.5Y_0.5VO_4 crystal and a folded cavity with a semiconductor saturable-absorber mirror grown by metal-organic chemical-vapor deposition. Stable cw mode locking with a 3.8-ps pulse duration at a repetition rate of 112 MHz was obtained. At 13.6 W of the incident pump power, a clean mode-locked fundamental-mode average output power of 3.9 W was achieved with an overall optical-to-optical efficiency of 29.0%, and the slope efficiency was 38.1%.

We have demonstrated a passively mode-locked diode end-pumped all-solid-state laser, which is composed of a Nd:Gd_0.5Y_0.5VO4 crystal and a folded cavity with a semiconductor saturable-absorber mirror grown by metal-organic chemical-vapor deposition. Stable cw mode locking with a 3.8-ps pulse duration at a repetition rate of 112 MHz was obtained. At 13.6 W of the incident pump power, a clean mode-locked fundamental-mode average output power of 3.9 W was achieved with an overall optical-to-optical efficiency of 29.0%, and the slope efficiency was 38.1%.

Single crystals of the new title compound are prepared by melting a mixture of PbO, PbF2, and H3BO3in the molar ratio 3:2:2 (Pt crucible, 15 h, controlled cooling).