Abstract Increasingly frequent earthquakes pose a serious threat to human lives and properties. However, the prediction of seismic activity is a major problem in seismic research. In this paper, we use the gray model to study seismic activity patterns. The Alpine–Himalayan seismic zone is selected as a study area for this work. Using seismic activity in the region, we analyze characteristics of time series related to seismic activity. Results show that the gray model for predicting seismic activity is available. The timing of the seismic activity of the Alpine–Himalayan seismic zone displays certain regularity. On the basis of computational analysis on July 20, 2015, a strong earthquake will occur in 26 years. In this paper, we use the application of a gray system that provides a new modeling approach in the field of disaster prevention to predict seismic activity, which is important in disaster prevention, disaster management, and rescue.
Previous studies have provided evidence about the brain plasticity effects of musical training, however, the issue of how expertise in music styles induced by Chinese or Western musical training affects neuroplasticity and reward responses has been less considered, especially for subjects of Chinese origin. In this work, 16 musicians who trained in the Western music style (Western-trained musicians) and 18 musicians who trained in the Chinese music style (Chinese-trained musicians) were recruited as the musician group for the experiment, while 15 non-musicians were recruited as the control group. Using a paradigm that consisted of listening to Chinese and Western music and measurements using functional magnetic resonance imaging (fMRI) technology, we found that Chinese-trained musicians activated the bilateral superior temporal gyrus (STG) when listening to music, while Western-trained musicians activated the left STG. In addition, under the condition of listening to music with Chinese style, Chinese-trained musicians have a stronger functional connection in the circuit of the auditory and reward system than Western-trained musicians. The finding is opposite under the condition of listening to music with Western style. Interestingly, it seems that the circuit of Chinese-trained musicians is partial to the right STG, while Western-trained musicians show the opposite, i.e., a tendency toward the left STG. The influence of different music styles on experienced musicians is reflected by the functional activities and connections between the auditory system and the reward system. This outcome indicates that training in Chinese music style or Western music style affects the strategies of musicians when listening to music. Musical characteristics such as rhythm, melody and cultural attributes play an important role in this process. These findings, which provide evidence for functional neuroplasticity based on musical training, can enrich our insights into the musical brain.
A novel design is presented, and the corresponding measuring system, which can be used to calibrate the servomechanism of a VTR (video tape recorder), to test the assembly errors of the video head drum assemblies, and to determine the exchangeability of the VTR, has been built. This design is based on the principle of the Bitter pattern method to show the magnetic track and the digital image processing technology, as well as the precise electromagnetic micromotion device. The accuracy of the previous measuring system depends on the location accuracy of the specimen stage of the measuring microscope, and it is about 0.5-1 mu m. In the present system, the measuring precision depends on the system amplification and the resolution of the digital image processing interface. Therefore, it is possible to improve the measuring accuracy of this system to deep submicrometer. As a result, the distance measurement precision of the present measuring system reaches 0.2 mu m.< >
A graphene metamaterial and strontium titanate (STO)-based terahertz absorber with tunable and switchable bifunctionality has been numerically investigated in this work. Through electrically tuning the Fermi energy level of the cross-shaped graphene, the bandwidth of the proposed absorber varies continuously from 0.12 THz to 0.38 THz with the absorptance exceeding 90%, which indicates the functionality of broadband absorption. When the Fermi energy level of the cross-shaped graphene is 0 eV, the proposed absorber exhibits the other functionality of narrowband absorption owing to the thermal control of the relative permittivity of STO, and the rate of change of the center frequency is 50% ranging from 0.56 THz to 0.84 THz. The peak intensity of the narrowband absorption approximates to nearly 100% through adjusting the Fermi energy level of the graphene strips. The calculated results indicate that it is not sensitive to the polarization for wide incidence angles. The proposed absorber can realize tunable bifunctionality of broadband absorption with a tunable bandwidth and narrowband absorption with a tunable center frequency, which provides an alternative design opinion of the tunable terahertz devices with high performance for high-density integrated systems.
A waveguide crossing mechanism based on metamaterial is proposed and numerically investigated using finite difference in time domain method. The waveguide cross is filled with impedance matched metamaterial, which has a large absolute value of refractive index, and effectively suppresses the diffraction of the guiding mode in the crossing region. The waveguide cross is ultra compact, and valid for a wide range of crossing angle with negligible crosstalk and insertion loss. The compactness and high efficiency make this crossing mechanism valuable in micro and nano photonics.
Aldehyde-ammonia condensation on Zn-ZSM-5 zeolite catalyst was studied. Effects of reaction temperature, reactants ratio, reaction time, space velocity and catalyst lifetime were investigated. The results showed that a high selectivity to alkyl-pyridine and the total yield of pyridine bases of over 85 % were attained under the optimum reaction condition as follows: reaction temperature 450 ℃, normal atmosphere, n (formaldehyde) : n ( acetaldehyde ) : n (ammonia) = 1 : 1 : 4 and space velocity (0. 6 - 1.0) h~(-1). The lifetime of Zn-ZSM-5 catalyst was more than 20 h under the reaction condition.
Credit business is the main source of profits and one of the most complex and difficult financial services in the decision-making and management for commercial banks.A loan asset with a good asset structure and a strong profitability is an important core competence for commercial banks.From the perspective of the banks,the paper analyzed the issue of lending loan to real estate projects.Because the investment decision is rigid,the conventional analytical methods are sufficient to evaluate.This paper analyzed an instance of a real estate project.The discount rate used a new model based on the capital asset pricing model to determine,which has good results and the practical significance.
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