[en] With the global environmental pollution and the lack of material resources, people are aware of the importance of ecological problems, and people begin to look at sports from an ecological perspective. Martial arts is a traditional sport of the Chinese nation. It has a long history and has evolved into today’s competitive martial arts after many years. The development status of Emishi martial arts is relatively slow compared to other provinces in China. This article will investigate and study the training venues of Emishi martial arts training institutions and the degree of support for martial arts projects by relevant government departments in various regions and cities. The environmental protection values of most training institutions do not meet the standards. There are few areas with standard competition venues. Local governments lack attention to martial arts and the reward system is not perfect. The study found that the application of Emishi martial arts aerobics in martial arts research camps from the perspective of ecological sports should be reflected in venues, props and costumes, music, teaching methods and non-intellectual factors. Choose a martial arts research camp with better air for the venue, environmental protection of props and clothing, music soothing to reduce noise, teaching methods and non-intellectual factors should follow the law of student development. (paper)

[en] PTC (positive temperature coefficient) material is a kind of thermo-sensitive material. In this study, a series of novel PTC materials adapted to thermal control of electron devices are prepared. By adding different low-melting-point blend matrixes into GP (graphite powder)/LDPE (low density polyethylene) composite, the Curie temperatures are adjusted to 9 °C, 25 °C, 34 °C and 41 °C, and the resistance–temperature coefficients are enhanced to 1.57/°C–2.15/°C. These PTC materials remain solid in the temperature region of PTC effect, which makes it possible to be used as heating element to achieve adaptive temperature control. In addition, the adaptive thermal control performances of this kind of materials are investigated both experimentally and theoretically. The result shows that the adaptive effect becomes more significant while the resistance–temperature coefficient increases. A critical heating power defined as the initial heating power which makes the equilibrium temperature reach terminal temperature is presented. The adaptive temperature control will be effective only if the initial power is below this value. The critical heating power is determined by the Curie temperature and resistance–temperature coefficient of PTC materials, and a higher Curie temperature or resistance–temperature coefficient will lead to a larger critical heating power. - Highlights: • A series of novel PTC (positive temperature coefficient) materials were prepared. • The Curie point of PTC material can be adjusted by choosing different blend matrixes. • The resistance–temperature coefficient of PTC materials is enhanced to 2.15/°C. • The material has good adaptive temperature control ability with no auxiliary method. • A mathematical model is established to analyze the performance and applicability

[en] abstract only

[en] In this study, ZnTPP-ZnO composite photocatalyst was prepared by impregnation method, and the samples prepared were characterized and analyzed by UV-Vis technology and TEM technology. The effects of light duration and ZnTPP loading on the photocatalytic degradation of methyl orange by ZnO were investigated. The experimental results show that ZnTPP is mainly loaded on the surface of ZnO particles in the form of surface adsorption, and plays the role of generating excited electrons and transferring electrons in photocatalysis. The degradation of methyl orange by the composite photocatalyst is mainly due to the photodegradation and the absorption peak is blue shift. The longer the light duration, the more degradation of methyl orange; The photocatalytic activity of ZnO is the highest when the sensitizer loading is 6 µmol. (paper)

[en] Thermoacoustic imaging with current injection (TAI-CI) is a novel imaging technology that couples with electromagnetic and acoustic research, which combines the advantages of high contrast of the electrical impedance tomography and the high spatial resolution of sonography, and therefore has the potential for early diagnosis. To verify the feasibility of TAI-CI for complex bone-containing biological tissues, the principle of TAI-CI and the coupling characteristics of fluid and solid were analyzed. Meanwhile, thermoacoustic (TA) effects for fluid model and fluid–solid coupling model were analyzed by numerical simulations. Moreover, we conducted experiments on animal cartilage, hard bone and biological soft tissue phantom with low conductivity (0.5 S/m). By injecting a current into the phantom, the thermoacoustic signal was detected by the ultrasonic transducer with a center frequency of 1 MHz, thereby the B-scan image of the objects was obtained. The B-scan image of the cartilage experiment accurately reflects the distribution of cartilage and gel, and the hard bone has a certain attenuation effect on the acoustic signal. However, compared with the ultrasonic imaging, the thermoacoustic signal is only attenuated during the outward propagation. Even in this case, a clear image can still be obtained and the images can reflect the change of the conductivity of the gel. This study confirmed the feasibility of TAI-CI for the imaging of biological tissue under the presence of cartilage and the bone. The novel TAI-CI method provides further evidence that it can be used in the diagnosis of human diseases. (paper)

[en] Abundances of REE in ultramafic rocks from Dalabute ophiolite are determined by preconcentration neutron activation analysis, contents of transition metal elements (TME) in them are measured by instrument neutron activation analysis. According to geochemical characteristics of REE and TME, it is indicated that lherzolite X₁₂ represents primary mantle in the studied area. Lherzolite X₁₀, X₁₁ and ore-bearing dunite X₁₇, harzburgite X₁₈ are refractory residue left after partial melting of the upper mantle. The nonore-bearing dunite X₈ and diallage-peridotite X₇, X₉ could be derived from the deep-seated ultramafic accumulate developed in a mafic liquid under a high-pressure condition within the upper mantle

[en] Up to 43 glaze and body samples of ancient and modern Chinese Jun Porcelain and other porcelain are chosen and contents of 36 elements for each sample are determined by NAA. The NAA data are then analysed by the fuzzy cluster method. The result shows that although the ancient Jun Porcelain samples span leaped 600 years and are from different kilns and their glaze colors are utterly different, they have a long-term, stable and mainly the same supply of raw material. The relation between ancient Jun Porcelain and ancient Ru Porcelain is also preliminarily analysed. It is found that only few modern Jun Porcelain samples are similar to ancient Jun Porcelain but the majority of them are different from ancient ones

[en] Based on transmission theory, a 17 × 17 polymer arrayed waveguide grating (AWG) multiplexer parameter optimization is performed, and the influence of the fabrication results on the transmission characteristics are analyzed. In this paper, we mainly discuss three of the main errors in the fabrication of polymer AWG devices. One is δn₁, which is caused by the tuning of the core refractive index n₁, the second is δb, which results from the rotating-coating of the core thickness b, and the other is the non-ideal core cross-section, which is caused by steam redissolution. The effects of the above fabrication errors on the transmission characteristics of the AWG device are investigated, and compensation techniques are proposed. By comparing the theoretical simulation and experimental results, the shift in the transmission spectrum is reduced by 0.028 nm, the 3 dB bandwidth is increased by about 0.036 nm, the insertion loss is reduced by about 3 dB for the central channel and 4.5 dB for the edge channels, and the crosstalk is reduced by 1.5 dB. (semiconductor devices)

[en] Highlights: • In present work, we report the active optical waveguides in Nd:YLF crystals fabricated by 4.5 MeV Si ions implantation at room temperature. • According to the studies, the prism-coupling and RCM calculations results show that the guiding mode can be well confined by the waveguide structures. • The spectral results demonstrate the initial upconversion luminescence intensity of Nd³⁺ ions can be effectively improved after irradiation at fluences of 1.0× 10¹⁴ cm^-2. -- Abstract: The planar waveguides have been fabricated in Nd:YLF crystals by Si implantation. The guiding properties of Si-implanted waveguide are evaluated by the prism-coupling technique and reflectivity calculation method (RCM), exhibiting good confinement and monomode behavior at 632.8 nm. The investigation of the photoluminescence (PL) measurement demonstrates that the luminescence characteristics of the Nd³⁺ ions are not significantly altered by the Si ions irradiation process, whereas the up-conversion (UC) luminescence intensity can be effectively improved. Based on the pump-power-dependent fluorescence, the possible emission mechanism in Nd:YLF is proposed.

[en] Gallium nitride (GaN)-based high electron mobility transistors (HEMTs) that work in aerospace are exposed to particles radiation, which can cause the degradation in electrical performance. We investigate the effect of proton irradiation on the concentration of two-dimensional electron gas (2DEG) in GaN-based HEMTs. Coupled Schrödinger’s and Poisson’s equations are solved to calculate the band structure and the concentration of 2DEG by the self-consistency method, in which the vacancies caused by proton irradiation are taken into account. Proton irradiation simulation for GaN-based HEMT is carried out using the stopping and range of ions in matter (SRIM) simulation software, after which a theoretical model is established to analyze how proton irradiation affects the concentration of 2DEG. Irradiated by protons with high fluence and low energy, a large number of Ga vacancies appear inside the device. The results indicate that the ionized Ga vacancies in the GaN cap layer and the AlGaN layer will affect the Fermi level, while the Ga vacancies in the GaN layer will trap the two-dimensional electrons in the potential well. Proton irradiation significantly reduced the concentration of 2DEG by the combined effect of these two mechanisms. (paper)