The shale oil reservoir is characterized by tight lithology and ultra-low permeability, its efficient exploitation requires the technology of multi-stage multi-cluster hydraulic fracturing in horizontal wells shut-in imbibition. After fracturing, a complex fracture network formed, large volume frac fluid stored within network. During shut-in, imbibition exchange between water occurs under action capillary force osmotic pressure, formation pressure builds up reservoir. On basis...

Diesel ultradeep desulfurization technology is pivotal in producing clean diesel. This paper examines the kinetic characteristics of CoMo catalyst diesel hydrotreating process. Integrating inhibitory effects hydrogen sulfide, nitrogen-containing compounds, and aromatic hydrocarbons, a three-lump model for hydrodesulfurization established. Variations flow composition along reactor axial direction under isothermal adiabatic conditions are simulated. Results indicate that, conditions, initial...

Printed Circuit Board (PCB) is the heart component of electronic products, and its defect detection basic requirement PCB quality control in production process. Traditional visual methods need artificial design features, so their accuracy poor, rate missed false high. To solve above problems, this paper proposes an improved YOLOv3 (You Only Look Once) method for plug-in solder spot defects based on combination ordered probability density weighting attention mechanism. First, order to obtain...

The kinetics of hydrodenitrogenation (HDN) were systematically studied in an isothermally high-throughput reactor over three kinds catalysts (CoMo, NiMo, and NiMoW) to produce clean diesel meeting the latest national standard China. influences reaction temperature, pressure, volume ratio H2 oil, space time on investigated obtain kinetic parameters. Two models considering influence self-inhibition proposed for HDN oil. results both are satisfactory. Taking two-lump model as example, it could...

Printed Circuit Boards (PCBs) are the foundational component of electronic devices, and detection PCB defects is essential for ensuring quality control products. Aiming at problem that existing plug-in solder defect algorithms cannot meet requirements high precision, low false alarm rate, speed same time, this paper proposes a method based on spatial convolution pooling information fusion. Firstly, basis YOLOv3, an attention-guided pyramid structure used to fuse context information, multiple...

Low-dose computed tomography (LDCT) images are polluted by mottle noise and streak artifacts. To improve LDCT quality, this paper proposes a novel total variation (NTV) model. A weighted coefficient of the regularization term NTV model is constructed standard deviation, gray-level probability gradient magnitude to smooth adaptively, since deviation detail region higher than that noisy background, edges background. Besides, preserve details effectively, fidelity proposed block-matching 3d...

Low-dose computed tomography (LDCT) images tend to be severely degraded by excessive mottle noise and steak artifacts. In this paper, an algorithm of modified smooth patch ordering (MSPO) is proposed improve the LDCT images. MSPO method, non-local means (NLM) replacing Leclerc robust function with bisquare function, serve as weight for estimate each pixel value. Then, NLM combined pixels, classification, subimage averaging scheme denoise image. Additionally, prewhitening image carried out...

Low-dose computed tomography (LDCT) technique is an important imaging modality, but LDCT images are always severely degraded by mottle noise and streak artifacts. The recently proposed nonlocally centralized sparse representation (NCSR) algorithm has good performance in natural image denoising, it suffers from residual artifacts can't preserve edges structure information well when implemented denoising. In addition, high computational complexity. To address this problem, paper, we propose...

As an inorganic sunscreen material, nano-titanium dioxide (nano-TiO 2 ) owns broad prospects in cosmetics for its small size, non-toxicity, strong covering ability, UV absorption and scattering abilities, etc. Nano-TiO has high photocatalytic activity, so it will go through a series of complex chemical reactions under light irradiation cause damage to surrounding agents.In addition, is hard disperse various aqueous non-aqueous mediums due surface energy hydrophobic property.In order apply...

Amorphous tin(IV) phosphate was used as adsorbent for the removal of Pb(II) and Cu(II) from aqueous solutions.The extent absorption investigated a function pH, contact time, absorbent concentration ionic strength.Experimental results showed that amount adsorbed heavy metal ions increased with increase solution pH in examined range (3.0-6.5) reaction time.The equilibrium data were analyzed using Freundlich Langmuir isotherm models.The sorption process followed model well.The maximum capacity...

Drone logistics is a novel method of distribution that will become prevalent. The advantageous location the hub enables quicker customer deliveries and lower fuel consumption, resulting in cost savings for company’s transportation operations. Logistics firms must discern ideal establishing hub, which challenging due to simplicity existing models intricate delivery factors. To simulate drone environment, this study presents new mathematical model. model not only retains aspects current...

The detection of defects in printed circuit board (PCB) components is crucial to the quality PCB. problems blurred details, complex and varied backgrounds poor recognition PCB lead accuracy. To address these problems, this paper proposes a component defect model (MSF-ECANet) based on multi-scale features efficient channel attention networks. Firstly, challenge unclear information regarding intricate deep networks, Residual Nets (ResNet) Multi-Scale Feature Pyramid Networks (FPN) are...

As the hydrodesulfurization (HDS) of diesel achieves ultra-deepness, our understanding its kinetics is still far from in-depth. Therefore, herein, two lumped kinetic models for ultra-deep (UHDS) and hydrodenitrogenation (HDN) are established based on experiments under a wide range operating conditions. Meanwhile, four-lump model aromatic hydrosaturation (AHS) erected. Our disclose thermodynamic decisiveness in UHDS, which unreachable beyond temperature upper limit or pressure lower limit. We...

Abstract Coalbed methane is an unconventional gas resource. Although the resource successfully developed in a few coal-bearing basins that are of type hydraulic seal with middle or high permeability at shallow depth, most coal seam pressure deep still not exploited by means existing technique. This paper describes fracturing technique for low coalbed reservoirs, including research & selection oil base gel fluid system; real-time simulation 3D fracture propagation; technology controlling...

Low-dose computed tomography (LDCT) image often contains mottle noise and streak artefacts, which seriously interfere with clinical diagnosis. In this study, the separation-based (SEPB) method is proposed for artefacts suppression structure preservation. it, LDCT decomposed into structural residual details by decomposition structural-preserving smoothing method. The filtered K-singular value algorithm to remove noise, in are extracted morphological component analysis theory. added get result...

The kinetics of hydrodenitrogenation (HDN) was systematically studied in an isothermally high-throughput reactor over three kinds catalysts (CoMo, NiMo, NiMoW) to produce clean diesel meeting latest national standard China. influences reaction temperature, pressure, volume ratio H2 oil and space time on were investigated obtain kinetic parameters. Two-lump model considering the influence self-inhibition selected for HDN after comparison with one-lump model. could well predict evolution...