To address the issue of performance testing hydraulic rock drills under specific working conditions, a stiffness–damping multi-stage adjustable simulation system has been proposed. Firstly, based on Kelvin theory, vibration model nonharmonic excitation is established. An integer-order created fluid mechanics theory. The characteristics granite and are studied, discussing influencing factors characteristics. Next, drop hammer calibration experiment an impact drilling for designed. Finally, in...

Congenital infection of Toxoplasma gondii is an important factor causing birth defects. The neural stem cells (NSCs) are found to be one the target for parasite during development brain. As a key virulence that hijacks host cellular functions, ROP18 has been demonstrated mediate inhibition innate and adaptive immune responses through specific binding different immunity related molecules. However, its pathogenic actions in NSCs remain elusive.In present study, recombinant adenovirus...

In the production and manufacturing process of hydraulic rock drill, there are small impact energy low frequency, a fault diagnosis method based on internal mechanism testing drill is proposed. This used to test change law oil in by retaining holes cylinder body other important components drill. At same time, mathematical deal with curve, influence pressure pulsation characteristics front rear chambers piston left right valve reversing performance analyzed. Based Newton’s law, model...

Quantitative trading strategies are designed to look for relationships between data about an underlying security and its future price then generate alpha on a desk. Recent years have witnessed the increasing attention from both academic corporate sectors enhancing quantitative by machine learning techniques due their excellent predictive powers, with few successful stories markets further boosting optimism this method of analysis. In paper, we aim conduct comprehensive survey pilot study...

Abstract In order to determine the influence degree of building information model (BIM) on stage landscape architecture design, firstly, this paper analyzes influencing factors application BIM in design based theory balanced score card (BSC), and then establishes hierarchical evaluation by using analytic hierarchy process (AHP). Finally, realizes quantitative degree. The research results show that level degree, transformation from qualitative analysis is realized, which proves feasibility...

For the phenomenon of a hydraulic rock drill based on an underlapped reversing valve, mechanical structure overlapped form was proposed, which affected pressure pulsation impact system, and motion piston analyzed. The model built Newton’s laws. initial lead size point calculated by equilibrium position damping final velocity piston. valve designed best interval calculated, according to characteristic curves in front‐rear chamber left‐right chamber, floating feature had point. advantages were...

The stress wave produced by the piston impact, on drill rod, is an important factor affecting impact performance. It particularly to control waveform generated rod meet requirements of efficiency and component durability some mechanical systems. Based theory, model rock drilling established, a dimensionless collision coefficient γ put forward, matching relationship between different coefficients waveforms analysed. length under same material condition determines change rule waveform....

Highlights•A deep learning model PDCNN for identifying DNA enhancers•Improving performance with position-aware encoders•Comparative studies have shown that is superior to existing modelsSummaryEnhancers, genomic elements, regulate neighboring gene expression crucial biological processes like cell differentiation and stress response. However, current machine methods predicting enhancers often underutilize hidden features in sequences, limiting accuracy. Hence, this article proposes the model,...

<title>Abstract</title> The rock simulation system is of great significance for the development high-frequency high-power hydraulic drills. It can simulate different drilling conditions in specific environments and observe effects under multi-scale conditions. This paper proposes a multi-stage adjustable with variable stiffness damping. Firstly, based on Kelvin theory, vibration model non-harmonic excitation established. Combining characteristics adaptive oil-gas suspension rigidity locking,...

This paper studies the ability of advertising in forecasting Internet financial frauds. Online reflects real-time operational decisions and is therefore more direct than features from reports. One most important tasks identifying non-obvious form general editorials so that we can use implicit advocacy behavior to infer true business motives. In order describe enterprises, propose a cascading classification method based on linear Support Vector Machine model, text data multiple channels,...

Scholars and industrial professionals are committed to integrating traditional financial economics models machine learning improve the prediction model for stock prices, which is still a challenging topic. However, there few acceptable results reported. This study proposes two-stage multi-view method that provides new integration perspective of finance theory technique. The first stage price from one kind or hybrid forecasting model, second adopts technique accuracy. makes empirical analysis...

How to build and improve forecasting models for stock prices are hot issues in both finance computer fields recent years. Under the framework of reinforcement learning, design learning mechanism is important. This paper presents a novel on trading Q-Iearning parameter adaptive (FTQL). Instead from errors directly, FTQL method proposes new by considering performance strategy based results asset allocation strategy. firstly extracts features closing underlying its associated set up logistic...

As a technological innovation of high‐power hydraulic rock drill, double damping system has very important effect on impact performance. The is floating mechanism. characteristics the mechanism have an influence energy, frequency, and power drill. Based orifice throttling theory, static equilibrium position piston was calculated, characteristic parameters were summarized as flow ( Q d ) feed force F ). According to characterization system, experimental scheme designed, combined data...

The once-booming but scandal-ridden peer-to-peer lending industry robbed hundreds of thousands retail investors their life savings in the past several years. This paper examines possibility and feasibility identifying P2P firm non-normal business operation exits with nature frauds by using company's ownership structure characteristics. adopts penetrated shareholder compositions firms to construct shareholding Ego-networks, proposes an Ego-network clustering approach describe compare...

Large pulsation and impact occur during the working process of hydraulic rock drill, which has a negative influence on system. Aiming at this phenomenon, related characteristics fluid inertia are studied in paper. The dynamic model reversing mechanism drill is established. Through parameter analysis model, concepts hard quantity soft proposed. coefficient C initial section crevice flow including deduced, comprehensive factors such as oil velocity, unstable friction resistance analyzed, value...

To study the effectiveness of cochlear implantation in deaf children with gene mutation. 420 from three medical centers implants were selected. Before wearing implant and 6 months after implant, children's rehabilitation efficacy was evaluated through categories auditory performance (CAP) speech intelligibility rating (SIR). The SSF-MCDI MUSS before treatment also compared. CAP SIR scores intervention higher than those (P < 0.05). Univariate analysis found that age implantation, parents'...

The oscillator with a double-sided unilateral spring is common nonlinear system that widely exists in the industry. In order to deepen understanding of its vibration characteristics, uncertainty quantification carried out. uncertain responses systems multi-solution phenomena are difficult be investigated by non-intrusive interval method. Thus, surrogate model based on normalized frequency proposed. First, solution response calculated harmonic balance method and arc-length Then, proposed...