To study the deterioration mechanisms of anhydrite rock under freeze-thaw weathering process, physico-mechanical characteristics and microstructure evolutions samples were determined by a series laboratory tests. Then, descriptive-behavioral model was used to measure integrity loss in caused cyclic freeze-thaw. Finally, damage revealed from macro micro aspects. The results show that pore size is mainly concentrated range 0.001–10 μm. As number cycles increases, there growth proportion...

Split reinforced concrete column (SRCC), recognized for their exceptional ductility as seismic members, have faced developmental challenges due to the complexities of on-site casting. This study presents an innovative steel sleeve dry connection assembled SRCC, which is highly modular and simplifies construction, aiming promote engineering application this ductile structural system. used a validated 3D finite element (FE) method analyze internal joint forces. Key parameters influencing...

Freeze–thaw cycles induced deterioration on rocks begins with the damage in microstructures such as pores and pore throats. This paper was devoted to providing a fundamental understanding of microscopic characteristics anhydrite rock exposed freeze–thaw attacks by using series laboratory tests. Meanwhile, relation between microstructure evolution mechanical resistance revealed. Results indicated that increase cycles, proportion micropores (r < 0.1 μm) throat radius within 0–0.1 μm (PT-I)...

Abstract Imbibition oil recovery plays an important role in the development of low-permeability fractured reservoirs. However, effects complex pore structure matrix on imbibition have not been considered comprehensively at different scales scientific literature. This paper reports a study mechanisms influence pores ratio and defines concept fractal coefficient using method combining numerical simulation core scale with mathematical methods scale. A model dimensions tortuosity capillary was...

The deterioration of anhydrite rock exposed to a freeze–thaw environment is complex process. Therefore, this paper systematically investigated the physical and mechanical evolutions freeze–thawed through series multi-scale laboratory tests. Meanwhile, correlation between pore structure macroscopic parameters was discussed, mechanisms under cycles were revealed. results show that with increase in processes, strength, elastic modulus, cohesion, proportions micropores (r ≤ 0.1 μm), PT-Ipore...

The residue of 17β-estradiol (E2) in milk could potentially lead to the occurrence various reproductive diseases; therefore, a rapid and sensitive method for monitoring E2 residues was highly necessary. In this study, we produced new polyclonal monoclonal antibodies using E2-3-O-carboxymethyl ether as hapten developed an indirect competitive enzyme-linked immunosorbent assay (icELISA) detection milk. results showed that sensitivity antibody higher than antibody, providing half maximum...

Sand liquefaction is a process in which the excess pore water pressure of saturated sand soils increases and effective stress decreases under action vibration, resulting transition from solid state to liquid state. In this paper, an underwater slope model containing upper bottom non-liquefied clay layer was designed. The whole large deformation flow reproduced by shaking table test recorded high-definition particle image velocimetry (PIV) equipment. Four main influencing factors:...

The stability of rock engineering in cold regions is deteriorated by the day–night and seasonal freeze–thaw environments. Therefore, it crucial to develop a damage constitutive model that can effectively describe evolution deformation characteristics under cycles. In this work, series laboratory tests were performed acquire physical mechanical anhydrite subjected processes. Experimental results show as number cycles increases, triaxial compression strength elastic modulus decrease...

The intra- and inter-prediction techniques have been effectively exploited in the H.264/AVC for significantly improving coding efficiency. However, exhaustively searching optimal prediction mode vastly increases its computational complexity. To decrease complexity of decision process, a novel fast algorithm is proposed this paper to speed up encoding process by predicting current macroblock based on motion activity neighboring macroblocks. has two main stages. First, SKIP utilized as an...

With the development of urbanization, numerous underground structures were constructed in composite soil. It is common that aseismic capacity structure influenced by Hence, during seismic design, located at soil should be noticed. In this study, response a frame-type subway station was explored shaking table tests. The acceleration response, strain distribution, and earth-pressure distribution model system under motion Kobe wave Chongqing artificial obtained interpreted. test results...

In this work, we have investigated the effect of martensite/bainite dual phase content on mechanical properties EA4T high-speed axle steel. For evaluation and control strength, ductility, toughness steel, microstructure lath martensite (LM) granular bainite (GB) was clarified through an optical microscope (OM), electron backscatter diffraction (EBSD), transmission microscopy (TEM). Besides, tensile fracture morphology studied by scanning (SEM). purpose, study conducted a quantitative...

A simple and low-cost hydrogen peroxide (H2O2) biosensor has been developed using a Yucca filamentosa plant leaf membrane in conjunction with an oxygen (O2) sensor. The contains peroxidase which can catalytically decompose H2O2 to produce O2. response rate was faster for (t90 time is ≈14 s) than the O2-permeable ≈200 sensitivity much improved. exhibited excellent linear calibration range from 85 μM 3.75 mM (correlation coefficient r = 0.9999) detection limit of 15.1 μM; repeatability...

Many existing text clustering algorithms overlook the semantic information between words and so they possess a lower accuracy of similarity computation. A new hybrid algorithm (HCA) based on HowNet semantics has been proposed in this paper. It calculates by using words’ concept description then combines it with method maximum weight matching bipartite graph to calculate semantic-based similarity. Based combining an improved genetic k-medoids algorithm, HCA designed. The comparative...

By block compressed sensing (BCS), the image can be and encrypted simultaneously. A novel reversible data hiding (RDH) method is proposed to embed additional into BCS images. In method, based on edge pixel separation, every used for embedding through a special measurement flipping. After decryption, considering correlation of natural images, fluctuation function find out flipped realise extraction recovery. Experiments show that outperform existing RDH in

This paper, based on DCT transform and image scrambling, presents the digital watermark embedding scheme. Embedding extracting in compressed video field are carried out this way. In is used as MPEG4 use to compress. Before embedded, scrambling adopted information .Also, position of bit modified by one chaos sequence, method promotes robustness security watermark. Experiments make it clear that scheme paper satisfy requirements for imperceptibility, security.

Based on the investigation of damage situations some reinforced concrete industrial factory buildings in Chengdu affected by Wenchuan Earthquake, and typical seismic analysis roof, skylight truss, columns, column bracing building envelope, this article puts forward several repair reinforcement measures methods for reference.

Shotcrete is the primary material for tunnel support due to its early rapid hardening characteristics. During construction in a sulfate environment, law of concrete will be affected. In this study, samples were prepared at six different curing times and immersed four concentrations solutions. A uniaxial test was conducted analyzed investigate effect attack on mechanical properties aged shotcrete materials. Results indicated that waterlogged does not have apparent cracks outside. The...

Reinforced cushion and pile are two important components of the geosynthetic-reinforced pile-supported (GRPS) composite foundation.Studies on traditional GRPS foundation with uniform section piles have compared performance before after reinforcement yet neglects effects type shape this foundation.To address problem, tapered (GRTPS) section-variable was proposed in study as a new form foundation.The settlement stress distribution soil under three conditions (gravel (GC), geogrid-reinforced...