Sticking Effect Research Articles

Numerical Study of Particle Impingement on Aeroengine under Mixed-Phase Conditions

In this approach, considering to ice crystal sticking effects, a numerical model was established to solve the particle impingement property of a large bypass ratio aeroengine under mixed-phase icing conditions. The collection efficiency of droplets obtained by the proposed model is are well in agreement with the literature and the collection efficiency of ice crystals is significantly higher than that of droplets due to the greater inertial force. The mechanism of liquid film acting on the ice crystal adhesion affect was investigated. It is found that the greater melt ratio can lead to more sufficient liquid water and more extended wetting limit, which have more significant capability of sticking ice crystals. Meanwhile, due to ice crystals subjected to centrifugal force, the sticking coefficient of ice crystal will cliff-like drop, and the cliff-like effect is more pronounced accompanied by the greater centrifugal force.

Drillability Evaluation and Sensitivity Analysis of the Fencheng Formation Strata in Maye Exploration Area

Abstract Predicting drillability ratings and selecting suitable drill bits are crucial for improving drilling efficiency. This investigation employed Principal Component Analysis (PCA) to normalize adjacent well logging parameters such as natural gamma, well diameter, natural potential, and others as influencing factors and established a mathematical model for the drillability ratings of hard rock formations. A sensitivity analysis of drilling parameters for the Fencheng Formation rocks revealed that sonic time difference, formation density, natural gamma, and resistivity were closely associated with drillability ratings. Empirical results showed that a multiple logarithmic linear regression approach accurately predicted drillability ratings for hard rock formations with over 95% precision compared to experimental values. The Fencheng Formation strata’s high hardness and abrasion resistance result in poor drillability (with ratings above 7.5), with rotational speed sensitivity found to be higher than drilling pressure sensitivity for expediting drilling in hard formations. For the “turbine + PDC bit” drill tool combination, it is recommended to use a drilling pressure of 40 - 80KN and a rotary table speed of 50 - 70r/min. High rotational speeds and low drilling pressures effectively reduce bit sticking effects, while using PDC bits with turbines reduces bit wear, improving the economic efficiency of drilling operations without sacrificing mechanical drilling speed.

Effect of stick and slip zones on fatigue life of a slewing ball bearing

Prediction of fatigue life of slewing ball bearings is challenging due to the influence of large deformations and adverse lubrication conditions. The present study presents an elegant simulation model that considers the flexibility of the supporting elements of the slewing bearing along with stick/slip zones at the raceway-ball contact interface. Using the stresses predicted by the simulation model, relative fatigue life using stick/slip condition versus no-friction condition is computed. A sensitivity study of the ball contact force, ball contact angle, coefficient of friction and raceway conformity is also performed. The present study also evaluates the results in comparison with full-sliding assumptions. The final results show that the stick/slip zone determination at the contact interface is beneficial for accurate determination of fatigue life of slewing bearings.

Swallowing Activating Effect of Ice Stick® in Dysphagia Patients

Swallowing Activating Effect of Ice Stick® in Dysphagia Patients

Eliminating sticking effects among fine strokes in micropatterning complex Chinese characters

In this work, complex Chinese micropatterns are experimentally inscribed in AgInSbTe thin films through laser writing technique. The overlapping inscription strategy is introduced to reduce the size of complex Chinese micropatterns, and the erosion algorithm is used to eliminate sticking effects among fine strokes in complex Chinese micropatterns. The results show that the size of complex Chinese micropatterns can be reduced to around 15.41µm×15.41µm. The width of the finest stroke is only 0.45 µm. This method can achieve a fidelity of 95%. This work helps with the long-term preservation of massive Chinese character archives.

Tape Casting and Characterization of h-BN/PU Composite Coatings for Corrosion Resistance Applications

In the present work, a slurry of polyurethane (PU) was prepared by adding various contents (3 and 8 wt.%) of hexagonal boron nitride (h-BN). Ethanol was utilized as a solvent to reduce the viscosity and sticking effect of the PU. The mixture was then applied as polymer matrix composite (PMC) coating on steel substrates via tape casting. The prepared coatings were characterized for their structure, adhesion and thermal properties, and corrosion resistance characteristics. The structural and morphological features of the h-BN/PU composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Rockwell-C adhesion tests were conducted to examine the adhesion between the substrate and composite coating. The potentiodynamic polarization tests were utilized to assess the anti-corrosion performance of composite coatings when applied and steel substrates. The results exhibited that the inclusion of h-BN filler (3 wt.%) could effectively enhance the anti-corrosion performance of the h-BN/PU composite. The reason for the improvement in corrosion properties was attributed to lower surface roughness, uniform distribution and great adhesion strength of PU/3 wt.% h-BN composite. Furthermore, the PU/3 wt.% h-BN composites showed relatively improved thermal stability and higher glass transition temperature (Tg). However, further loading of h-BN contents (8 wt.%) deteriorates the thermal and corrosion resistance properties of the composite due to the clustering of h-BN, which creates localized areas of increased corrosive activity.

Anisotropy-driven velocity log reconstruction in deviated wells: A case study from deepwater Sadewa Field

Deviated drilling is a common cost-cutting strategy used in efforts to develop deepwater hydrocarbon fields. By utilizing the existing platform, new wells are drilled with a particular inclination to reach the intended depth level as a branch of the main vertical well. Drilling at inclination results in a change in the direction of observation from data collection. This change will affect the measured magnitude value when well logging is carried out, especially on physical parameters sensitive to the direction of the measurement such as velocity. Distortion of velocity values due to the orientation effect of data collection has been a limiting factor in seismic analysis because of phase changes during the well-to-seismic tie, inconsistent amplitude variation with offset responses, and ambiguity in the appearance of the hockey stick effect on long-offset seismic data. The oil and gas industry is starting to move toward developing concepts that link the presence of anisotropy recorded in field data with the possibility of hydrocarbon reservoirs. Velocity logging (sonic and shear sonic) should begin to get more attention to support this strategy of making data retrieval results more precise. The motivation of this study is to apply the method of calculating velocity compensation values to reconstruct sonic and shear sonic logs in deviated wells by utilizing anisotropy parameters. By reconstructing the velocity log, the authors attempt to verticalize the log to return the log function to represent subsurface conditions.

A Framework for Art-directed Augmentation of Human Motion in Videos on Mobile Devices

This paper presents a framework and mobile video editing app for interactive artistic augmentation of human motion in videos. While creating motion effects with industry-standard software is time-intensive and requires expertise, and popular video effect apps have limited customization options, our approach enables a multitude of art-directable, highly customizable motion effects. We propose a graph-based video processing framework that uses mobile-optimized machine learning models for human segmentation and pose estimation to augment RGB video data, enabling the rendering and animation of content-adaptive graphical elements that highlight and emphasize motion. Our modular framework architecture enables effect designers to create diverse motion effects that include body pose-based effects such as glow stick or light trail effects, silhouette-based effects such as halos and outlines, and layer-based effects that provide depth perception and enable interaction with virtual objects.

The damage mode and forced response characteristics of articulated lining structure: A case study of metro tunnel under a reverse fault action

With the continuous development of underground tunnel engineering, there have been a large number of engineering cases of tunnels crossing active faults, and the dislocation of active faults must have a greater impact on the structural safety of tunnels. Therefore, it is of great significance to study the stress characteristics and anti-dislocation design of tunnels crossing active faults. Based on the tunnel of Urumqi Metro Line 1 crossing the Wanyaogou reverse fault, a large-scale physical model test of shear dislocation of subway tunnel crossing the reverse fault is designed and carried out, and the mechanical behavior difference between conventional tunnel structure and articulated tunnel structure is compared and analyzed. The surface displacement, structural deformation, additional earth pressure, strain distribution, fracture distribution and other test results were monitored and recorded, and the forced response characteristics and failure mode of subway tunnel structure under the effect of stick–slip of reverse fault were studied in depth. The results show that the failure modes of conventional tunnel are mainly shear failure at the fault plane, while articulated tunnel is mainly large eccentric failure. Compared with the conventional tunnel, the deformation failure range, strain peak and total crack length of the articulated tunnel are obviously reduced. Besides, there is no spalling phenomenon similar to conventional tunnel. The structure still has a certain residual bearing capacity, that is, the articulated tunnel structure is more adaptable to the forced displacement of the fault, the stress state is better, and its rupture resistance is better. To sum up, the model test study reveals the forced response characteristics and rupture resistance of articulated tunnel structure under reverse fault conditions, which has guiding significance for similar tunnel engineering problems.

Active control of friction realized by vibrational excitation: Numerical simulation based on the Prandtl-Tomlinson model and molecular dynamics

Superlubricity and active friction control have been extensively researched in order to reduce the consumption of fossil energy, the failure of moving parts, and the waste of materials. The vibration-induced superlubricity (VIS) presents a promising solution for friction reduction since it does not require high-standard environment. However, the mechanism underlying the VIS remains unclear since the atomic-scale information in a buried interface is unavailable to experimental methods. In this paper, the mechanism of VIS was examined via numerical calculation based on the Prandtl—Tomlinson (PT) model and molecular dynamics (MD) simulations. The results revealed that the pushing effect of stick—slip is one of the direct sources of friction reduction ability under vibrational excitation, which was affected by the response amplitude, frequency, and the trace of the tip. Moreover, the proportion of this pushing effect could be modulated by changing the phase difference when applying coupled vibrational excitation in x- and z-axis. This results in a significant change in friction reduction ability with phase. By this way, active friction control from the stick—superlubricity can be achieved conveniently.

A numerical simulation study of ash deposition in a circulating fluidized bed during Zhundong lignite combustion

In the present work, a modified critical viscosity model considering condensation, thermophoresis and inertia impaction has been established to simulate ash deposition on a probe perpendicularly placed in the flue path in a circulating fluidized bed (CFB) burning high-sodium (Na) Zhundong lignite (ZD). The key influencing factors including flue gas velocity (3 – 15 m/s) and temperature (1023 – 1123 K), probe surface temperature (773 – 873 K), particle temperature (1073 – 1173 K), particle size (5 – 127 µm), and particle chemistry were systematically simulated and also experimental observed. The simulation results show that the thickness of the deposit on the windward side reached 3.4 mm over 6 h, which agreed well with the experimental observation. The deposit incurred an increase in the surface temperature to 1000 K, reducing the heat flux by 62.5 %. The mean size of the deposited ash at the stagnant point was found to be 25 – 30 µm, signifying its role in the deposition initiation. This is attributed to the synergistic effect of particle impaction and particle sticking, since particles with a higher Stokes number (0 – 8) would have a higher impaction probability (0 – 0.3) but a lower sticking probability once their kinetic energy exceeds 11.4 × 10-9 J. Moreover, ash deposition is also found to be affected by flue gas temperature, followed by particle temperature and probe temperature to a less degree. In addition, particles with smaller sizes rich in Na tended to deposit on the probe than those particles with larger sizes and abundant in Si and Al, highlighting the role of Na in initiating ash deposition during ZD CFB combustion.

Therapeutic effect of auricular acupoint sticking and pressing on postoperative pain of patients with granulomatous lobular mastitis

Therapeutic effect of auricular acupoint sticking and pressing on postoperative pain of patients with granulomatous lobular mastitis

Study on mechanical response of steel pipe jacking considering the effect of pipe sticking

Pipe sticking is frequently occurred during the pipe jacking in rock strata due to the blockages accumulated in the annulus gap. The frictional resistance induced by surrounding rocks increased sharply, and the total jacking force might exceed the pipe structural capacity. Through the in-situ monitoring and direct shear tests, the influence of the pipe sticking on the deformation and frictional properties of the steel pipe jacking was analyzed. In the severe pipe sticking, the contact pressure acting on the pipe exceeded 1 MPa, and significant radial compression took place. The hoop strain of the pipe contacting with the blockages illustrated a tensile state, while the pipe contacting with the slurry or groundwater exhibited compressive strain. In the direct shear tests, the frictional properties of the steel pipe-rock interface under five contact conditions were evaluated. Experimental results revealed that the pipe-rock friction coefficient under the blockages exhibited as high as 0.6, and the blockages in annulus gap were the main reason for the increase in frictional resistance. In addition, the causes of the pipe sticking were analyzed, and measures were implemented to resolve the pipe sticking issue.

A Meta analysis on effect of auricular point sticking and pressing therapy in the treatment of hyperemesis gravidarum

A Meta analysis on effect of auricular point sticking and pressing therapy in the treatment of hyperemesis gravidarum

Effect of auricular acupoint sticking and pressing therapy on preventing postoperative nausea and vomiting in patients undergoing thoracolumbar surgery under general anesthesia

Effect of auricular acupoint sticking and pressing therapy on preventing postoperative nausea and vomiting in patients undergoing thoracolumbar surgery under general anesthesia

Analysis of the Effect of Drug Stick and Early Functional Exercise to Prevent Postoperative Dysfunction in Intertrochanteric Fracture

Analysis of the Effect of Drug Stick and Early Functional Exercise to Prevent Postoperative Dysfunction in Intertrochanteric Fracture

Clinical Effect of Auricular Point Sticking in Patients with Lung Cancer Receiving Chemotherapy

Objective: To discuss and analyze the clinical effect of auricular point sticking in lung cancer chemotherapy. Methods: Sixty-two patients with lung cancer treated with chemotherapy in Suqian Traditional Chinese Medicine Hospital of Jiangxi Province were selected for case evaluation and analysis. The time span of the research was from June 2020 to June 2021. The patients were divided into two groups: a study group (n = 31) and a control group (n = 31) based on their medical record numbers. All the patients were treated with conventional western medicine before and after chemotherapy to prevent adverse reactions; however, the patients in the study group were also treated with auricular point sticking in addition to the former. The relevant indexes of the two groups were compared. Results: The incidence of adverse reactions was significantly lower in the study group compared to the control group (P < 0.05); the rate of symptomatic relief of the patients in the study group was higher than that of the control group (P < 0.05); the stress response indexes toward chemotherapy of the study group were better than those of the control group (P < 0.05). Conclusion: Auricular point sticking for patients with lung cancer who are receiving chemotherapy can reduce the incidence of adverse reactions, alleviate clinical symptoms, such as chest distress, asthma, and poor appetite, significantly alleviate stress response caused by chemotherapy, as well as promote the treatment effect; thus, it is worthy of promotion.

The Influence of The Cooperative Learning Model with Type of Talking Stick on Students Learning Outcomes in Economic Subjects Class X Social Sciences Sman 1 Rantau Pulung

This study aims to determine: (1) The use of cooperative learning model type talking stick in economics subjects class X social science SMAN 1 Rantau Pulung; (2) The achievement of economic learning outcomes from the cooperative learning model of the type talking stick in students of class X social science SMAN 1 Rantau Pulung; (3) The Use of cooperative learning model type talking stick effect of the on economic learning outcomes in students of class X social science SMAN 1 Rantau Pulung. This research is a quantitative research type of quasi-experimental research or quasi-experimental, research with research subjects namely students of class X Social Sciences SMA Negeri 1 Rantau Pulung with class X social science 2 as many as 23 people as experimental class and class X social science 3 as many as 26 people as control class. Data collection is done by using the test technique. Based on the results of the descriptive analysis, the average for the experimental class increased by 12.54% while the average value for the control class experienced a slight decrease of 0.44%. Through the results of hypothesis testing, the sig value is obtained. (2-tailed) t-test for Equality of Means is 0.005 so that the significance value is <0.05, which means that H0 is rejected or Ha is accepted. So, it can be concluded that there is a significant effect of the talking stick type cooperative learning model on the economic learning outcomes of class X social studies students at SMA Negeri 1 Rantau Pulung.

Study of stick–slip suppression and robustness to parametric uncertainty in drill strings containing torsional vibration tool using sliding-mode control

Excessive stick–slip vibration of drill strings can cause inefficiency and unsafety of drilling operations. To suppress the stick–slip vibration that occurred during the downhole drilling process, a drill string torsional vibration system considering the torsional vibration tool has been proposed on the basis of the 4-degree of freedom lumped-parameter model. In the design of the model, the tool is approximated by a simple torsional pendulum that brings impact torque to the drill bit. Furthermore, two sliding mode controllers, U1 and U2, are used to suppress stick–slip vibrations while enabling the drill bit to track the desired angular velocity. Aiming at parameter uncertainty and system instability in the drilling operations, a parameter adaptation law is added to the sliding mode controller U2. Finally, the suppression effects of stick–slip and robustness of parametric uncertainty about the two proposed controllers are demonstrated and compared by simulation and field test results. This paper provides a reference for the suppression of stick–slip vibration and the further study of the complex dynamics of the drill string.

The Use of Core & Log Anisotropy Parameters into Seismic Data Processing: A Case Study of Deep-Water Reservoir

The seismic far-offset data plays important role in seismic subsurface imaging and reservoir parameters derivation, however, it is often distorted by the hockey stick effect due to improper correction of the Vertical Transverse Isotropy (VTI) during the seismic velocity analysis. The anisotropy parameter η is needed to properly correct the VTI effect. The anisotropy parameters of ε and δ obtained from log and core measurements, can be used to estimate the η values, however, the upscaling effects due to the different frequencies of the wave sources used in the measurements must be carefully taken into account. The objective is to get better understanding on the proper uses of anisotropy parameters in the the velocity analysis of deepwater seismic gather data. To achieve the objective, the anisotropy parameters from ultrasonic core measurements and dipole sonic log were used to model the seismic CDP gathers. The upscaling effects is reflected by the big difference of measured anisotropy values, in which the core measurement value is about 40 times higher than the log measurement value. The CDP gathers modelling results show that, due to the upscaling effect, the log and core-based models show significant differences of far-offset amplitude and hockey sticks responses. The differences can be minimized by scaling-down the log anisotropy values to core anisotropy values by using equations established from core – log anisotropy values cross-plot. The study emphasizes the importances of integrating anisotropy parameters from core and log data to minimize the upscaling effect to get the best η for the VTI correction in seismic velocity analysis.