Based on 0.655PMN-0.345PT piezoelectric ceramics, a novel piezoelectric vibration actuator was proposed. The model of the actuator was designed and fabricated by the manufacturing process. The grains of the PMN-PT ceramics were investigated by microstructure analyses. The performances of the proposed actuator were studied. The results showed that the actuator achieved a charge sensitivity of 65.9 pC/g at room temperature, a sensitivity deviation of 2.792% in the range of 10 Hz∼3000 Hz, a transversal sensitivity ratio of 0.7%. The highest sensitivity deviation of the actuator reached 0.088%, which meet the application requirements. Compared with the other three actuators on the market, the proposed actuator got a good performance.

Using a microwave solvothermal technique, the Bi/BiOBr photocatalyst was effectively synthesized in this article. Oxytetracycline (OTC) was used as a simulated pollutant to assess the photocatalytic efficacy of Bi/BiOBr. Inorganic salt operation parameters, beginning concentration, and the amount of catalyst all have an impact on how effectively Bi/BiOBr degrades on OTC, according to the results of photocatalytic degradation experiments. Additionally, the catalyst exhibits some degrading activity toward moxifloxacin and sulfadiazine, supporting its broad-spectrum properties. The free radical quenching experiment proved that the Bi/BiOBr photodegradation system is heavily dependent on h+ and •O2 −, and •OH This study offers a fresh approach to creating effective solar-powered catalysts for the treatment of water contamination.

In this paper, Cu-Ti alloy powder with Ti content of 2%, 2.5%, 3% and 3.5% was prepared by mechanical alloying method, and then Cu-Ti alloy powder was formed using vacuum hot pressing sintering method to prepare Cu-Ti alloy. The results show that the complete mechanical alloying time of Cu-2%Ti, Cu-2.5%Ti, Cu-3%Ti and Cu-3.5%Ti is 1h, 1h, 1.5h and 2h, respectively. Cu-Ti alloys with different Ti contents prepared by vacuum hot pressing sintering, the comprehensive properties of Cu-2.5%Ti are better, with electrical conductivity of 33.42%IACS and tensile strength of 385 MPa, which is 193.5% higher than that of pure copper. The hardness is 201.66HV, 331.1% higher than that of pure copper.

Juronidine have attracted extensive investigations in the field of chromogenic and chemiluminescent materials. In this thesis, DFT and TDDFT methods are used to study the excited state hydrogen bond dynamics and excited state proton transfer mechanism of JDF, including the analysis of its geometric structure, infrared vibration spectrum, absorption and emission spectra, frontier molecular orbitals, and potential energy curve. Results show that the intramolecular hydrogen bond in the JDF molecule weakens after photoexcitation, leading to the relatively high barrier (6.7 kcal/mol) during proton transfer process in the S1 state.

A novel wide-band circularly polarized (CP) antenna with a step-like dielectric resonator (DR) is proposed, which features a two-order step-like dielectric resonator (TSDR) and fed by a Microstrip-slot structure. The parameter values of the TSDR are adjusted and the return loss (S 11), axial ratio (AR), gain and radiation pattern are estimated by using HFSS. Results show that the new antenna has 10 dB S 11 bandwidth of 56.3% (3.7 GHz-6.6 GHz), 3 dB AR bandwidth of 52.2% (3.78 GHz-6.45 GHz), and gain of 2 dBic-4.4 dBic, respectively. The usable bandwidth and peak gain are increased by 15% and 13%, respectively.

In this experiment, nano silver was prepared by photo reduction method, the trisodium citrate, polyvinylpyrrolidone-K30 and silver nitrate were added under the condition of water as solvent. Polyvinylpyrrolidone-K30 was used as dispersant, silver nitrate as precursors, and sodium citrate as reducing agent. (UV-vis) and scanning electron microscopy (SEM) showed that the diameter of prepared nano silver were between 50 nm and 80 nm, and the results showed that the shape of the nanosized silver nanoparticles were spherical and irregular. Carbomer940 was selected as the gel matrix which is stable and no stimulation, and the viscosity changes with the PH changes. The nanometer silver gels were prepared by mixing nano silver and carbomer940. The antibacterial loop test was carried out with Escherichia coli and Staphylococcus aureus. The antibacterial test showed that the prepared silver nanoparticles had antibacterial effect, and the antibacterial effect was tested by several kinds of nano-silver gels with different concentrations of 0 μg/ml, 4 μg/ml, 8 μg/ml, 12 μg/ml, 16 μg/ml, 20 μg/ml and 24 μg/ml. The results of bacteriostatic circle test showed that the gel had significant bacteriostatic effect on E. coli and S. aureus, which could cause gynecological inflammation. The optimal bacteriostatic concentration was between 12 microns/ml and 24 microns/ml.

Polymer-based energy storage media are widely used in electrical and electronic applications due to their high power density and excellent charge and discharge efficiency. In this paper, thermoplastic polyurethane elastomer (TPU) organic fillers were doped with polyetherimide (PEI) by the solution blending method to prepare PEI composite films with excellent energy storage properties. The effects of different TPU contents on the dielectric properties, leakage current density, and energy storage performance of the composite films were explored. The results showed that the flexible TPU fillers, which could improve the inter-chain interactions and spatial structure of PEI, reduced the chain spacing of the polymer, effectively hindered the input of charge carriers, and mitigated the electric field distortion, thus improving the insulation and dielectric properties of PEI. When the mass fraction of the added TPU elastomer reaches 0.75%, the energy storage density of the composite film reaches 11.51 J/cm3, which is 2.88 J/cm3 higher than that of the pure polyetherimide, while maintaining a high charge/discharge efficiency (87.32%), and the energy storage performance has been significantly improved under an applied electric field strength of 600 MV/m. The results show that the composite film is more efficient than the pure polyetherimide, and the energy storage performance has been significantly improved.

La3+ doped CuO/ZnO heterojunction composites were synthesized by sol-gel-assisted hydrothermal method and aqueous solution chemistry method. The morphologies and structures of as-prepared CuO/ZnO heterojunction composites were investigated by adding different La3+doping concentrations. The results indicated that the morphology of CuO/ZnO heterojunction composites can be controlled and changed effectively by the different concentrations of La3+. The photoelectric properties of La3+ doped CuO/ZnO heterojunction composites photoelectric devices were investigated by the response to ultraviolet light. The results indicated that the photoelectric sensitivity of La3+ doped CuO/ZnO heterojunction composites photoelectric devices increases with the increase of the concentration ratio of [La3+]/[Cu2+]. When the concentration ratio of [La3+]/[Cu2+] is 8%, the dark current and photocurrent of La3+ doped CuO/ZnO heterojunctions composites photoelectric devices are 0.019 µA, 90.86µA, and the photoelectric sensitivity of that is 4782.1, which prove that La3+ doped CuO/ZnO heterojunctions composites have a remarkable improvement for heterojunction PDs.

The amount of aluminum alloy plates and strips in cars is gradually increasing, and the insulation plates are mainly A1235 aluminum plates. In this experiment, the cold-rolled sheet of A1235 aluminum alloy aluminum foil cast-rolled billet after four cold rolling is taken as the research object, the tensile test was carried out by universal tensile testing machine, supplemented by Metallographic microscope (OM), Scanning Electron microscope (SEM) and Energy Dispersive Spectrometer (EDS),the microstructure, tensile properties, thermal physical properties and fracture morphology of cold rolled sheet before and after annealing were systematically analyzed, and the effect of annealing process on A1235 aluminum foil billet was studied. The results show that the microstructure becomes recrystallized and the grain size decreases significantly after homogenizing annealing at 500 °C for 3h; when the product was annealed at 340 °C and held for 3 h, the number of recrystallized grains was large and uniform, and the average size was 32.06 nm; after annealing, the tensile and yield strength of the A1235 foil billet gradually decrease, and the elongation gradually increases.

Diverse expansion volumes of expanded graphite (EG) were synthesized utilizing the chemical oxidation technique, and modified EG was produced by coating EG with distinct expansion ratios employing polyacrylate. The modified EG/natural rubber (NR) composites were fabricated using the modified EG, and the impacts of varying expansion volumes of EG on the mechanical and thermal characteristics of these composites were scrutinized. The findings revealed that following polyacrylate modification, the surface roughness and active groups of EG experienced a substantial increase. The tensile strength of the composite material escalated in correlation with the expansion volume of the modified EG, exhibiting an enhancement of 81.72%. The elongation at break, stress at a specified elongation, and thermal conductivity demonstrated a pattern of initially increasing and subsequently decreasing as the expansion volume increased. The thermal conductivity of the material reached its peak at an EG expansion volume of 20 g/mL, with a thermal conductivity of 0.569, and an overall favorable mechanical performance.