Huainan Union University

With the further implementation and development of the Western Development Strategy, studying the mechanical behavior and deformation characteristics of deep-buried tunnels in layered hard rock under high ground stress conditions holds considerable engineering significance. To study the mechanical properties and long-term deformation and failure characteristics of different bedding stratified rocks, this research employed an MTS815 electro-hydraulic servo rock testing system and a French TOP rheometer. Triaxial compression tests, rheological property tests, and long-term cyclic and unloading tests were conducted on shale samples under varying confining pressures and bedding angles. The results indicate that (1) under triaxial compression, shale demonstrates pronounced anisotropic behavior. When the confining pressure is constant, the peak strength of the rock sample exhibits a “U”-shaped variation with the bedding angle (its minimum value at 60°). For a fixed bedding angle, the peak strength of the rock sample progressively increases as the confining pressure rises. (2) The mode of shale failure varies with the angle: at 0°, shale exhibits conjugate shear failure; at 30°, shear slip failure along the bedding is controlled by the bedding weak plane; at 60° and 90°, failure occurs through the bedding. (3) During the creep process of layered shale, brittle failure characteristics are evident, with microcracks within the sample gradually failing at stress concentration points. The decelerated and stable creep stages are prominent; while the accelerated creep stage is less noticeable, the creep rate increases with increasing stress level. (4) Under low confining pressure, the peak strength during cyclic loading and unloading creep processes is lower than that of conventional triaxial tests when the bedding plane dip angles are 0° and 30°, which is the opposite at 60° and 90°. (5) In the cyclic loading and unloading process, Poisson’s ratio gradually increases, whereas the elastic modulus, shear modulus, and bulk modulus gradually decrease.

The mechanical behavior and fracture mechanisms of deep fractured rocks under explosive dynamic loads are critical for understanding rock instability in engineering applications such as blasting operations. This study aims to investigate how the presence of pre-existing cracks and different stress states affect the mechanical properties and fracture patterns of rock-like specimens under dynamic loading conditions. We utilized a Split Hopkinson Pressure Bar (SHPB) with an active confining pressure loading device to conduct impact compression tests on rock-like specimens containing pre-existing cracks. These tests were performed under uniaxial and triaxial stress states to simulate various in-situ stress conditions. The study revealed three key findings: (1)The dynamic compressive strength of specimens with pre-existing cracks exhibited a non-monotonic relationship with crack inclination angle under uniaxial stress, contrasting with an increasing trend under confining pressure, highlighting the significant effects of confining pressure and strain rate. (2)Confining pressure significantly altered the failure modes, with specimens failing predominantly in axial tension at 0° and 90° crack inclinations, and a mix of axial tension and shear at 30° and 60°, indicating complex failure mechanisms. (3)The pre-existing crack angle under confining pressure influenced the propagation path and fractal dimension of the specimen, with an increasing angle correlating to higher fractal dimensions and a positive impact on compression peak stress. The research provides valuable insights into the complex fracture behavior of fractured rocks under dynamic loads, which can inform the design of blasting parameters in deep engineering. It also offers critical knowledge for preventing rock instability-related disasters, thus holding significant theoretical and practical importance in the field of rock mechanics and engineering.

ABSTRACT Introduction Research on scientific fitness exercises for the elderly has an important practical significance and can improve the physical fitness and health of the elderly. Chinese research on scientific conditioning exercises for the elderly is still lacking, especially when comparing results between different sports approaches in the elderly. Objective To study the effects of different types of exercise on the physical performance and health of the elderly. Methods 329 healthy elderly volunteers (161 men) with a mean age of 64.5 years from 6 different sports activities were selected. The following indicators of body shape and physical function were evaluated before and after training: height, weight, waist circumference, hip circumference, vital capacity, heart rate, systolic blood pressure, and diastolic blood pressure. All indicators were collected following the standardized methods of China’s national fitness monitoring system. Exercise intensity was monitored with the subject’s target heart rate. Physical exercises were performed for 30 to 40 minutes, 3 to 4 times a week. Results The type of physical exercise has a significant association with human performance and health. Conclusion Exercise and fitness programs positively correlate with human performance and health. Evidence level II; Therapeutic Studies - Investigating the results.

The construction of DNA logic circuits is the basis of DNA computers. DNA origami has nanoscale spatial addressability, which provides an ideal framework for the construction of DNA logic circuits. Here, we propose a strategy for constructing DNA logic circuits based on a DNA origami substrate. First, hairpin DNA strands are anchored on a DNA origami substrate to form a DNA wire track. Then, we design three different output ends for different logic circuits (AND, OR and NAND). The operations of the logic circuits are completed on the DNA wire track through the proximal hairpin circuit cascade. Finally, the results of the logical operation are determined by fluorescence detection. We use this strategy to construct two-input AND, OR, and NAND gates on a DNA origami substrate, and then extend this strategy to the construction of large-scale logic circuits and functional combinational logic circuits.

In this paper, surface water of mining cities is pretreated by biological contact oxidation process filled with modified suspending biochemical packing, the characteristics of natural biofilm and the removal of organic pollutants, ammonia nitrogen, total nitrogen and turbidity in surface water were studied. The results show that the structure of mature biofilm is stable and the microbial population appears diversity, and the system has good removal effect on ammonia nitrogen and total nitrogen during the stabilization period, while the removal of organic pollutants and turbidity is slightly worse, the removal effect of the system on organic pollutants, ammonia nitrogen and total nitrogen is better at higher temperatures; on the contrary, the system has a good removal effect on turbidity at lower temperatures.

Analyzed, the results show that the EGA analysis can effectively characterize solid waste in each stage of pyrolysis. Using the EGA technology, such as paint. RDF release in different stages of the gas composition in the combustion process.Gasification and combustion dynamic characteristics. To master the research of waste incineration process mechanism, composition and the corresponding influencing factors, the corresponding model is established. Introduction Waste is car paint, chemical and other industries of industrial waste, such as cannot carry on the effective treatment can cause resource waste and environmental pollution. To study and analysis in the laboratory using the instrument, and then applying research results to industrial equipment, has the advantages of high efficiency, low investment. Sludge mainly includes make water to the harm of environmental deterioration of water quality, pollution of soil and crops, etc.[1]Traditional methods of sludge treatment and disposal (landfill) because of the high cost, and easy to cause secondary pollution, incineration is feasible processing method. Good combustion organization is the first condition of efficient and clean combustion, the combustion conditions can reduce pollutants through reasonable control original generation.[2] Equipment Experiments using thermo gravimetric analyzer is Germany NETZSCH STA409 thermogravimetric analyzer. Fourier transform infrared spectroscopy (FTIR, the core equipment for the Michael interferometer. Due to the synchronous measurement requirements and thermogravimetric analyzer, so is preheated to a certain stage in thermogravimetric analyzer, infrared analyzer should also enter a state of preheating, set the preheating temperature of the airway (set to 200 C). Experiment and Discussion For some typical waste (paint, sludge, garbage derivatives, etc.) the pyrolysis oxidation test, the data is obtained. FTIR sampling parameters in experiments were not change, always be: resolution, 4cm; Scanning way, double-sided bidirectional; Scanning speed, 40 kHz. The Times of scanning and 16 times. The IR spectrum of SPPO, CLSPPO, triazoleand tetrazole-membranes are showed in Figure.1. The spectra for SPPO (a) is characterized by a band at 1192 cm corresponding to the −S=O bond, and those corresponding to -SO3 groups are observed at 1026 and 1066 cm. After chlorosulfonation of the SPPO with thionyl chloride, a new band corresponding to −SO2Cl group appeare at 1374cmon the spectra for ClSPPO (b) and then the -SO3 groups disappeared. This observation is agree with previous IR studies on chlorosulfonated membranes.[3] After reaction with -NH2 of the MOFs or NAPI, the −SO2Cl band totally disappeare and a new band at 1170cm, corresponding to −SO2NH− group, confirm the acid-amine bonding in Figure (c) and (d).[4] 2nd Annual International Conference on Advanced Material Engineering (AME 2016) © 2016. The authors Published by Atlantis Press 733 Fig.1. IR spectrum of (a) SPPO, (b)ClSPPO , (c)and (d)triazoleand tetrazole-membranes [1]HNMR spectroscopy is suitable for charactering the capability of target molecules reactivity and adsorptivity.[5]We therefore use this analytical technique to determine the sulfonylation reaction with ClSPPO and amino in Heterocycle. The [1]HNMR spectrum (DMSO) of the triazoleand tetrazole-membranes are shown in Figure. 2. We can observe that one signal at δH= 7.4 ppm caused by the sulfamide groups in membrane triazole (a) and tetrazole (b).[6] Fig.2. H NMR spectra of thetriazoleand tetrazole-membranes. (a) (b) (c) (d)

Fault diagnosis of rolling bearings is of great significance to ensure the production efficiency of rotating machinery as well as personal safety. In recent years, machine learning has shown great potential in signal feature extraction and pattern recognition, and it is superior to traditional fault diagnosis methods in dealing with big data. However, most of the current intelligent diagnostic methods are based on the ideal conditions that bearing data set and label information are sufficient, which are often not always available in engineering practice. In response to this problem, this paper proposes to use probabilistic mixture model (PMM) to approximate the data distribution of the bearing signal, and then use Markov Chain Monte Carlo (MCMC) algorithm to sample the probabilistic model to expand the fault data set. In addition, Semi-supervised Ladder Network (SSLN) can achieve the effect of supervised learning classifier with only a few labeled samples. Based on Case Western Reserve University (CWRU) Bearing Database, the recognition accuracy of the proposed PMM-SSLN model can reach 99.5%, and the experimental results show that this model is applicable to the case where both bearing data set and label information are insufficient.

In this study, we developed an efficient catalysis-oxidation method for the degradation of phenol in wastewater, in which the Fe3O4 nanocrystals and H2O2 were employed as catalyst and oxidation agents respectively. Firstly, Fe3O4 nanocrystal coated with PEG was prepared via an oxygenation-deposition hydrothermal method, TEM, FT-IR, BET and XRD characterization indicated that the prepared Fe3O4 nanocrystals had an average size of 26 nm and the specific surface of 35.25 m2/g. Using the prepared Fe3O4 nanocrystals as catalyst, the phenol in wastewater was efficiently degraded by H2O2. The degradability of the phenol was investigated by FT-IR, HPLC and UV–visible spectrophotometer, and the experimental results showed that the phenol was efficiently degraded by H2O2 and the Fe3O4 nanocrystals could be efficiently recycled. Finally, the possible catalytic reaction mechanisms and pathways of phenol degradation were discussed.