Jianping Wei

Jianping Wei
Weifang University | WFU · Department of Economic & Management

Bachelor of Business Administration

About

84
Publications
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Publications

Publications (84)
Article
The resonance of coal reservoir induced by external excitation is a kind of environment‐friendly stimulation technology. In this work, an experimental system was established to carry out the coal resonance fracturing experiments, and the change trend of fracture structure was investigated by computed tomography scanning. The results showed that und...
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The quality and efficiency of coalbed methane (CBM) drainage are critical for the safe production of coal mining enterprises in China. Air leakage should be prevented during CBM drainage because it can reduce drainage concentration and induce produce accidents such as coal seam spontaneous combustion. However, existing theoretical models for CBM dr...
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The wetting process of coal seam water injection is a typical unsaturated flow, but the steady-state method for measuring liquid permeability cannot reflect the unsaturated flow process of water in coal. The principle of wetting and expanding process of liquid in coal medium is very complex, and the multiscale pore characteristics of coal make the...
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In actual coal mining operations, hazards like coal and gas outbursts pose significant threats to safety. Extracting coal seam gas through boreholes is the main method of coal mine gas disaster management. Currently, coal seam gas pressure often obtained through direct measurement in underground boreholes requires substantial human and material res...
Article
Uncovering gas adsorption characteristics of coal at the molecular scale is of great theoretical significance for the study of gas occurrence, coalbed methane exploitation, and carbon dioxide sequestration. In this study, based on proximate analysis, ultimate analysis, 13C nuclear magnetic resonance, and Fourier-transform infrared spectroscopy expe...
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Coal seam water injection is a kind of comprehensive prevention and control measure to avoid gas outburst and coal dust disasters. However, the gas adsorbed in the coal seriously influence the coal-water wetting effect. With the deepening of coal seam mining, the gas pressure also gradually increases, but there is still a lack of in-depth understan...
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Introduction: The initial velocity of gas diffusion (ΔP) of coal is an important index to characterize the outburst risk of coal, and temperature is an important factor affecting the determination of initial velocity of gas diffusion. However, how to control the temperature during ΔP determination remains a significant challenge. Methods: In this p...
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The paper elaborates the effects of ionic liquids (ILs) on the phase equilibrium temperature, induction time, gas consumption, gas consumption rate, and water to hydrate conversion in the presence of 0.25, 0.63, 0.95, 1.25, 3.75, 6.25, and 10.00 wt % ethyltributylphosphonium hexafluorophosphate ([P2 4 4 4][PF6]), tributylhexylphosphonium hexafluoro...
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Coal seam water injection was widely used to prevent mine gas and dust disasters. It is undeniable that the gas adsorbed on coal surface can influence the coal-water wettability. In order to investigate how the gas environment affects the coal-water contact characteristics, the coal-water contact angle was tested under different gas environments, i...
Article
In order to reveal the coal-water contact characteristics under the gas atmosphere, the change rule of coal-water wetting angle under different CH4 and He pressures was investigated experimentally, combining with the proximate analysis, ¹³C NMR and FTIR, the coal macromolecular model was constructed to simulate coal-water adsorption under the condi...
Article
To explore the gas desorption law of granular coal during negative-pressure (NP) slag discharge sampling, atmospheric-pressure (AP) desorption, BP desorption and negative-to-atmospheric pressure (NP-AP) desorption experiments were performed. Based on the experimental results, the variation laws of the gas diffusion coefficient in the NP and NP-AP e...
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Reasonable use of different types of low-frequency vibration can better improve the production of coalbed methane (CBM). To understand the gas transport properties under low-frequency vibration in coal, a new permeability model of CBM reservoirs was proposed in this study. This model takes into account the deformation of coal matrix and fractures c...
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This study aims to further explain abnormal phenomena occurring during coal and gas outbursts and grasp the gas production effect of the micro-structure on outburst coal surface under the action of the electric field. To this end, in this study, an experimental system for gas production of coal excited by the external DC electric field was establis...
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The natural frequency of coal is one of the important technical parameters for the application of the permeability enhancement technology of coal and rock forced vibration. Aiming at exploring the dominant frequency of the permeability enhancement technology of coal vibration excited by vibration wave, the model of coal vibration excited by simple...
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Surfactant can improve the wettability of water to coal, which is beneficial to reduce the production of coal dust in coal seam water injection. Through the measurement and calculation of contact angle and its decay rate, the wettability differences of SDS (C12H25OSO3Na), AES (C14H29O5NaS), OP-10 (C18H30O10), and JFC (RO(CH2CH2O)nH) to anthracite w...
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The key to improving the efficiency of supercritical carbon dioxide (SC-CO2) jet drilling and completion is to clarify the mechanism of the SC-CO2 jet breaking coal. A large proportion of tiny coal powders appear during SC-CO2 jet breaking. However, there is no theory explaining this phenomenon. This study analyzed the cause of this phenomenon from...
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The migration law of dust in the roadway is the basis of dust control, but most of the relevant studies are based on the horizontal roadway, ignoring the roadway inclination. Therefore, numerical simulation and similar experiments are used to systematically study the settlement and diffusion law of dust in roadways with different inclination angles...
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The difficulty in enhancing the low permeability of deep coal seams is the key problem restricting gas extraction. The technology of coal rock resonance and permeability enhancement excited by vibration wave is hailed as a new technology to enhance coal seam permeability. In particular, the effect of resonance and permeability enhancement is remark...
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Coal seam water injection is one of the important means of mine disaster prevention, which helps to restrain the production of dust and reduce gas concentration. Ionic surfactant can change the capillary force of water in coal pore fissures, so as to enhance the wetting effect of coal seam water injection. However, the research on the effect of sur...
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Hydraulic stimulation techniques are widely used to improve the CBM production. However, the water blocking effect severely restricts the stimulation effect. In this work, the different kinds of inorganic salts were used to increase the liquid surface tension so that the water blocking effect can be diluted by reversing the capillary force directio...
Article
In order to determine the gas pressure for water-intrusion borehole, this work proposed a new method for measuring gas pressure based on gas solubility. A series of laboratory experiments and field test were carried out to investigate the composition of mine water, the gas solubility in mine water and the gas dissolved amount in borehole water over...
Article
To study the meso-damage evolution in coal under loading conditions, the industrial CT scanning tests under the uniaxial compression condition were carried out using an industrial CT scanner equipped with a loading control system. The gray level co-occurrence matrix (GLCM) theory was applied to quantitatively analyze the meso-damage evolution and t...
Article
Conveying gas velocity, rotation speed, and particle diameter are all common parameters in a negative pressure pneumatic conveying system that affect the system's energy consumption and design. Herein, the effect of the above three parameters on the transport behavior of coal particles was investigated by coupling Computational Fluid Dynamics and t...
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Coalbed methane is a risk of coal mining safety while being an important energy source, and gas extraction is the most effective treatment method. However, roadway and borehole surrounding rock fracture lead to air leakage and thus reduce gas extraction efficiency. To determinate the surrounding rock fracture zone and improve the borehole sealing e...
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Determining the deformation characteristics and mechanical behavior of gas-bearing coal is beneficial to understanding the phenomena and rules of dynamic disasters during coal mining. In this study, a computed tomography (CT) scanner and a triaxial loading seepage system were used to perform CT scanning tests on gas-bearing coal under triaxial comp...
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The evaluation of particle saltation velocity is vital for the design of dilute negative phase pneumatic conveying systems. Nonetheless, the particle saltation velocity in dilute negative phase pneumatic conveying is largely understudied, it also lacks a consistent correlation over operating conditions and particle properties. As such, this paper i...
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The impact pressure distribution of an SC-CO2 jet was studied to determine its mechanism of action. The generation and development of an impact jet were numerically simulated using Fluent, and the effects of the nozzle structure and stand-off distance on the impact jet were studied via I-Scan. It was concluded that the impact pressure of the stagna...
Article
The model for gas transport processes occurring in nanopore channels is one of the unsolved key scientific issues in the gas migration law of low-permeability coal seam. Previous models rarely considered the influence of microscopic boundary constraints on the mean-free path of gas molecules in nanopore channels. Based on the gas dynamics theory, t...
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Fracture is the primary channel of gas seepage in coal seams and controls the drainage efficiency of coal bed methane (CBM). However, the seepage characteristics and dynamic evolution law in the fractures of gas-bearing coal under external loads are yet to be clearly revealed. In this study, an industrial computer tomography (CT) scanner equipped w...
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Correction for ‘Selective oxidation of alcohols on hydrogen titanate nanotubes under visible light irradiation: relationship between nanostructure and catalytic activity’ by Juan Yang et al. , Catal. Sci. Technol. , 2016, 6 , 7604–7614, DOI: https://doi.org/10.1039/C6CY01345G
Article
The formation water intruding into the coal seam through cross-layer seriously reduces the gas extraction efficiency. In this work, a series of experiments were carried out to investigate the influence of long-time pressure water on the mineral content and pore structure of coal. Results show that, the water intrusion makes a decrease in the types...
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An abrasive air jet, which is sufficiently powerful to break rock, has significant potential in the field of assisted rock breaking, such as assistive tunnel excavation using a tunnel boring machine. To make its application more efficient and beneficial, a clear and definite erosion mechanism of an abrasive air jet is necessary. However, the presen...
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The diffusion of gas in water-saturated porous media plays a significant role in CO2 geological sequestration and mine gas prevention and control. However, it is lack of an accurate model to calculate the effective diffusion coefficient of gas in a water-saturated coal core. In this work, an improved model was constructed to calculate the effective...
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The dynamic evolution characteristics of fractures in coal under different compressive loads are of great significance to the recovery of coalbed methane (CBM). In this paper, the X-ray computer tomography (CT) detections of coal samples under uniaxial and triaxial compressive loading conditions were performed by using a developed triaxial in situ...
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Supercritical carbon dioxide (SC-CO2) jet is a promising technology for the extraction of coalbed methane. As a key component in the process of jet formation, the nozzle is an essential factor affecting the efficiency with which an SC-CO2 jet breaks coal and rock. The nozzle structure directly affects the energy conversion rate and flow field struc...
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The goal of this study is to develop a cost-efficient carbon adsorbent for effective CO2 capture and CO2/CH4 separation. Using anthracite as the precursor, highly microporous nitrogen-doped (N-doped) carbons are fabricated through a combination of KOH activation and urea treatment. The as-prepared carbon samples possess developed microporosity and...
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In order to effectively improve the efficiency of ventilation and dust removal, the flow field and dust migration characteristics under different ventilation parameters are deeply studied and analyzed by using the method of similar experiment and numerical simulation. Research results show that the change of the height of the ventilation duct affec...
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To understand the effects of thermal shock on microcrack propagation and permeability in coal, thermal shock tests were conducted on coal specimens by using a constant temperature drying oven (105 °C) and a SLX program controlled cryogenic tank. The growth and propagation of microcracks were measured with computer tomography (CT) scanning and scann...
Article
In the study, experimental methods were selected to measure the internal structure of the free-flow field formed at the nozzle outlet and the impinging flow field formed near the surface of the target and the pulsation frequency in milliseconds. The Schlieren instrument was used to collect a series of spatial structure photographs of the free-flow...
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To understand the gas penetration properties during unloading confining pressures and permeability enhancement mechanism in coal, temperature shocks, seepage tests, NMR, CT and SEM scanning tests were carried out with trimmed coal samples. The results showed that the coal permeability increased with the decrease of confining pressures after tempera...
Article
The SO2 solubility in ionic liquids and absorption mechanisms with different functionalities, including ether, halide, carboxylate, dicarboxylate, thiocynate, phenol, amino, azole groups, etc., are presented in this review. Strategies of improving SO2 capture with low binding energy and the separation performance from CO2 are also concluded. Genera...
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Separation of CO2/CH4/N2 is significantly important from the view of environmental protection and energy utilization. In this work, we reported nitrogen (N)-doped porous carbon spheres prepared from sustainable biomass glucose via hydrothermal carbonization, CO2 activation, and urea treatment. The optimal carbon sample exhibited a high CO2 and CH4...
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Determining the width of the stress relief zone on roadway surrounding rocks is the premise to optimize drilling borehole effect and increase gas extraction efficiency. In this study, a new width measurement method of the stress relief zone on the roadway surrounding rocks was proposed, which determined the width according to gas pressure attenuati...
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The characteristics of pore-fracture networks in coal seams and their evolution under compression are important for exploration and development of coalbed methane (CBM) and for the forecasting of coal dynamic disasters. Significant process has been made in fracture characteristics of rocks, however, the visualization and detailed quantitative chara...
Article
The pressure drop characteristics of negative pressure sampling drill pipe were studied experimentally in this work. The pressure drop was measured by a customized designed negative pressure sampling test system. The effects of the inner diameter of the drill pipe, the solid-gas rate and the inlet air velocity on the internal pressure drop of the d...
Article
Liquid nitrogen freeze-thaw has been used in oil, shale gas, and coalbed methane exploitation as an efficient fracturing technology. To further reveal coal damage and cracking characteristics due to liquid nitrogen freeze-thaw, coal samples with different water saturations (0%, 48.2% and 93.1%)were classified into the inner and outer parts, which w...
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In order to supply benefits for safe production of coal underground and efficient exploitation of coalbed methane, a self‐developed gas seepage experimental device considering gas adsorption and desorption was proposed to study the seepage properties of gas‐saturated coal in this paper. A series of gas seepage experiments under different loading co...
Article
Spontaneous combustion of coal has long been a thermal dynamic hazard during coal mining, storage, and transport, posing a great threat to coal mine safety. Especially coal spontaneous combustion in longwall goaf poses a great threat to underground working crew. To investigate such a mine safety issue with more insights and “what if” scenarios, thi...
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Separation of impurities (CO2 and N2) from CH4 is an important issue for natural gas alternatives (such as coalbed gas, biogas, and landfill gas) upgrading. It is notably challenging to synthesize high N-doped porous carbon with an appropriate porous structure. In this work, high N content (14.48 wt %) porous carbon with micropore size of 0.52 and...
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Coal mine dust continues to be a health and safety issue in underground coal mines. Coal seam water infusion was developed and widely applied in European coal mines for dust control, and was also a common practice in most Chinese coal mines. This method typically involves the infusion of water into the coal seam to increase its moisture content, an...
Article
To study coal permeability evolution under the influence of mining actions, we conducted a sensitivity index test on permeability to determine the influence of axial and confining stresses on coal permeability. Loading and unloading tests were performed afterward, and the differences between loading and unloading paths in terms of strain and permea...
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Coal and gas outburst during underground mining operations negatively affects the mining safety and decrease the mining productivity. Current outburst prediction has been largely relying on seismic monitoring which is passive and extremely difficult to quantify. As coal produces radon in the damage process, this unique feature potentially offer a n...
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The goal of this research is to develop a low-cost porous carbon adsorbent for selective CO2 capture. To obtain advanced adsorbents, it is critical to understand the synergetic effect of textural characteristics and surface functionality of the adsorbents for CO2 capture performance. Herein, we report a sustainable and scalable bio-inspired fabrica...
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Although the impact of Karst Collapse Pillars (KCPs) on water inrush has been widely recognized and studied, few have investigated the fluid-solid interaction, the particles migration inside KCPs, and the evolution feature of water inrush channels. Moreover, an effective approach to reliably predict the water inrush time has yet to be developed. In...
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Efficient oxidation of methane over heterogeneous catalysts under ambient conditions is still a challengeable study toward C1 utilization and atmospheric cleansing. In this study, by using a hydrolysis method combined with an impregnation process, β-Ga2O3 nanoparticles supported uniformly on activated carbon (AC) can be obtained readily. The as-pre...
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Nanostructured H-titanate materials with different morphologies, including nanotubes, nanosheets and nanofibers, are examined as active photocatalysts for the selective oxidation of alcohols to elucidate the relationship between the structure and the catalytic properties. H-titanate nanotubes (H-TNTs) exhibit superior photocatalytic performance und...
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Accurately determining coalbed gas content is difficult using the existing sampling methods in China. In this paper, the drawbacks of the sampling method based on positive pressure pneumatic conveying were analyzed. The sampling method based on negative pressure pneumatic conveying was presented aiming at increasing the coal sampling purity. Furthe...
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A gas–solid coupling model involving coal seam deformation, gas diffusion and seepage, gas adsorption and desorption was built to study the gas transport rule under the effect of protective coal seam mining. The research results indicate: (1) The depressurization effect changes the stress state of an overlying coal seam and causes its permeability...
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The factors of pipe diameter, drilling velocity and the degree of hole collapse effects on vacuum pneumatic conveying were studied by the self-developed vacuum pneumatic conveying experimental system. The results revealed the following three facts. 1) for a certain external diameter 73mm∼ the best choice for the inner diameter was 36∼ 46mm; 2) when...
Article
Interrupted pulsed water jet has great potential for application in hard rock breakage as it can be easily generated and controlled. The sharp nature of the head and tail of the jet significantly influences on water hammer pressure of the jet and efficiency of hard rock breakage. In this paper, the evolution of a single pulse was captured using hig...
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Formation, propagation and attenuation of stress waves during rock breakage by pulsating jets are simulated by introducing the Johnson-Holmquist-Concrete nonlinear constitutive model, and using the smoothed particle hydrodynamics approach. The curve of stress over time at different locations of the rock surface under the action of high-velocity pul...
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Fully-mechanized mining with filling is an effective method to control ground surface subsidence and solve environmental issues induced by mining. Based on elastic plate theory and key strata of the rock strata control theory, we simplified and defined roof key strata under fully-mechanized mining with filling as rectangular thin plates with comple...
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In order to study the desorption laws of loaded gas-filled raw coal, and based on a self-made gas-filled coal heat - flow - solid - mechanical coupled adsorption - desorption experiment system, the gas desorption quantities of coal samples were experimentally measured during each loading stage under the combination of various confining pressure and...
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Presently, there is an increasing number of water outburst accidents in China as mining activity continues to develop to deeper ground. In these accidents, water outburst caused by karst collapse columns often results in serious damage, involving both the loss of lives and significant economic loss. Therefore, it is of utmost importance to study th...