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In soft lithography roof collapse is frequently observed on the stamp surface consisting of rectangular micro-grooves which yields unwanted contact between the sagged surface and the substrate. Deep understanding of the adhesive contact behavior is a key to design of high-performance collapse-resistant stamp. Both theoretical and numerical studies are presented for a single rectangular micro-groove in the middle of the stamp surface under applied pressure. The JKR-type adhesion solution is established by the principle of superposition and equivalent energy release rate, with a series of closed-form expressions derived which are consistent with previous studies. Finite element analysis (FEA) is performed based on virtual crack closure technique (VCCT) to investigate the roof collapse mechanism with interfacial adhesion and applied pressure considered. Comparison of theoretical, numerical, and experimental results demonstrates that both size effect and constitutive nonlinearity of the stamp on the self-collapse contact width are not obvious for shallow grooves but become prominent for deep grooves, so that the obtained analytical solution is limited to shallow grooves due to its assumptions of half-plane and linear elasticity adopted for the stamp. For deep grooves, the present FEA method shows potential to capture more accurate results. [ABSTRACT FROM AUTHOR]

This study investigates the impact of incorporating an Inner Ring Groove (IRG) on the leakage characteristics of dry gas seals, commonly used in turbomachinery such as gas turbines and compressors. The primary objective is to enhance sealing performance and reduce gas leakage, which is critical for improving the efficiency of these machines. The research focuses on various groove shapes, including spiral grooves for single-direction rotation and T-grooves and tree grooves for bi-directional rotation. The experimental setup involved measuring air leakage rates across different seal configurations, both with and without the IRG. The results indicated that while the IRG increased leakage in spiral groove seals, it significantly reduced leakage in T-groove and tree groove seals. Specifically, the IRG reduced leakage by approximately 26% in T-groove seals and 15.8% in tree groove seals, compared to their standard configurations. Additionally, the study employed Particle Image Velocimetry (PIV) to visualize gas flow within the seal gaps. The visualization revealed that the IRG altered the flow dynamics, particularly in T-groove seals, where it redirected the gas flow from a radial to a circumferential direction, thereby reducing leakage. In contrast, the IRG in spiral groove seals promoted radial flow, leading to increased leakage. These findings suggest that the application of IRGs can be particularly effective in bi-directional rotation seals, offering a potential design modification to enhance sealing performance. The study concludes that while IRGs may not be suitable for all groove types, their strategic application can lead to significant improvements in leakage reduction and overall efficiency of dry gas seals. [ABSTRACT FROM AUTHOR]

Studies demonstrate that low frequencies and syncopation can enhance groove—the pleasurable urge to move to music. This study examined the simultaneous effect of low-frequency amplitude and syncopation on groove by manipulating basslines in house music, a subgenre of electronic dance music (EDM). One hundred and seventy-nine participants listened to 20 novel house music clips in which basslines were manipulated across two levels of low-frequency amplitude and syncopation. Music and dance-related experience, as well as genre preferences, were also assessed. Groove perception was most pronounced for house tracks combining high low-frequency amplitude (LFA) and high syncopation, and least pronounced for tracks with low LFA, irrespective of syncopation. Exploratory correlation analysis revealed that groove perception is influenced by listeners' preferences for energetic and rhythmic music styles, their urge to dance, and their propensity to experience an emotional connection to music. Our findings reveal that the urge to move when listening to music is shaped by the interplay of rhythmic complexity and sonic texture, and is influenced by dance and music experiences and preferences. [ABSTRACT FROM AUTHOR]

This study searches for an effective cross-sectional shape of grooves by evaluating their trapping effect using numerical methods. Grooves are widely employed to enhance lubrication performance across various systems, including in bearings and valves, where they serve multiple functions, such as improving load-carrying capacity, addressing pressure imbalances, storing lubricant, and minimizing leakage. Beyond these roles, grooves are crucial in preventing three-body abrasive wear by capturing solid particles, such as wear debris, within the system. This study specifically focuses on the trapping effect of grooves, examining how variations in their cross-sectional shape and the Reynolds number of the lubricant used influence this effect. To evaluate the groove's trapping capability, the study analyzed particle trajectories and streamlines within the groove, as well as the number of particles effectively trapped. The results indicate that grooves with certain cross-sectional shapes, particularly those generating multiple vortices and small eddy currents, demonstrate superior trapping effectiveness. These findings contribute to the design of more efficient grooves in lubrication systems, providing insights into how groove geometry can be optimized to enhance the performance and longevity of mechanical components by mitigating wear through effective particle entrapment. This research has potential applications in the design and improvement of lubrication systems where managing wear and enhancing efficiency are critical concerns. [ABSTRACT FROM AUTHOR]

Creative movement, in the form of music- and dance-based exercise and rehabilitation, can serve as a model for learning and memory, visuospatial orientation, mental imagery, and multimodal sensory-motor integration. This review summarizes the advancement in cognitive neuroscience aimed at determining cognitive processes and brain structural and functional correlates involved in dance or creative movement, as well as the cognitive processes which accompany such activities. We synthesize the evidence for the use of cognitive, motor, and cognitive-motor function in dance as well as dance's potential application in neurological therapy and neurorehabilitation. Finally, we discuss how partnered interaction and sensorimotor integration in dance, and "dancing robots" could shed light on future application of dance as rehabilitation, of dance used in technology and potential mechanisms of benefit from dance-based activities. [ABSTRACT FROM AUTHOR]

Groove pancreatitis (GP) is a rare and clinically distinct form of chronic pancreatitis affecting the pancreaticoduodenal groove comprising the head of the pancreas, duodenum, and the common bile duct. It is more prevalent in individuals in their 4–5th decade of life and disproportionately affects men compared with women. Excessive alcohol consumption, tobacco smoking, pancreatic ductal stones, pancreatic divisum, annular pancreas, ectopic pancreas, duodenal wall thickening, and peptic ulcers are significant risk factors implicated in the development of GP. The usual presenting symptoms include severe abdominal pain, nausea, vomiting, diarrhea, weight loss, and jaundice. Establishing a diagnosis of GP is often challenging due to significant clinical and radiological overlap with numerous benign and malignant conditions affecting the same anatomical location. This can lead to a delay in initiation of treatment leading to increasing morbidity, mortality, and complication rates. Promising research in artificial intelligence (AI) has garnered immense interest in recent years. Due to its widespread application in diagnostic imaging with a high degree of sensitivity and specificity, AI has the potential of becoming a vital tool in differentiating GP from pancreatic malignancies, thereby preventing a missed or delayed diagnosis. In this article, we provide a comprehensive review of GP, covering the etiology, pathogenesis, clinical presentation, radiological and endoscopic evaluation, management strategies, and future directions. This article also aims to increase awareness about this lesser known and often‐misdiagnosed clinical entity amongst clinicians to ultimately improve patient outcomes. [ABSTRACT FROM AUTHOR]

Nerve injuries and neurodegenerative disorders remain serious challenges due to the poor results of nerve cell regeneration. The most promising treatment for such injuries is treatments based on stimulating cells to grow and differentiate stem cells in that area into nerve cells, but there are obstacles in controlling the growth and differentiation into fully functional nerve cells and research is ongoing to overcome these obstacles. In this study, polymethyl methacrylate (PMMA) and its laser modified surfaces were used for cell culture and differentiation into neuron-like cells. In order to show the differentiation of PC12 cells into neuron-like cells, the expression levels of the neuronal markers Map2 and Synapsin-1 were examined. The results showed the growth of PC12 on raw PMMA was increased significantly compared to the control group and micrometric parallel grooves lead to a significant difference in cell growth compared to raw PMMA. Also, the simultaneous irradiation of laser to the cell cultured on PMMA caused more cell adhesion on the surface, faster growth and differentiation of PC12 into neuron-like cells. [ABSTRACT FROM AUTHOR]

Copyright of Metal Working (1674-165X) is the property of Metal Working Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Body movements play a crucial role in music performance and perception, and they do so well beyond those devoted to sound production itself. Various movements related to the performer's emotional intentions or structural aspects of the music are also part of the performance and crucial to the listening experience. In the present study, we investigated the effect of instructed timing on such non-sound producing body movements, focusing on musicians' body posture. We used an infrared motion-capture system to record the movements of skilled guitarists and bassists while they were playing electric guitar and electric bass, respectively. We instructed the musicians to perform under three different timing-style conditions: laid-back (behind), on-the-beat, and pushed (ahead). We also conducted short semistructured interviews to gain further insight into their movement strategies. The results show that performers generally leaned forward when instructed to play systematically slightly ahead of the pulse. We suggest that this change is related to an alteration in the performer's experience of the feel of the music. The results support the view that musicians' non-sound-producing body movements are not random, but integral to the performance, and that they are closely related to the music's microrhythmic feel. [ABSTRACT FROM AUTHOR]

This study investigates the impact of incorporating an Inner Ring Groove (IRG) on the leakage characteristics of dry gas seals, commonly used in turbomachinery such as gas turbines and compressors. The primary objective is to enhance sealing performance and reduce gas leakage, which is critical for improving the efficiency of these machines. The research focuses on various groove shapes, including spiral grooves for single-direction rotation and T-grooves and tree grooves for bi-directional rotation. The experimental setup involved measuring air leakage rates across different seal configurations, both with and without the IRG. The results indicated that while the IRG increased leakage in spiral groove seals, it significantly reduced leakage in T-groove and tree groove seals. Specifically, the IRG reduced leakage by approximately 26% in T-groove seals and 15.8% in tree groove seals, compared to their standard configurations. Additionally, the study employed Particle Image Velocimetry (PIV) to visualize gas flow within the seal gaps. The visualization revealed that the IRG altered the flow dynamics, particularly in T-groove seals, where it redirected the gas flow from a radial to a circumferential direction, thereby reducing leakage. In contrast, the IRG in spiral groove seals promoted radial flow, leading to increased leakage. These findings suggest that the application of IRGs can be particularly effective in bi-directional rotation seals, offering a potential design modification to enhance sealing performance. The study concludes that while IRGs may not be suitable for all groove types, their strategic application can lead to significant improvements in leakage reduction and overall efficiency of dry gas seals.

Performance behaviours of oil-lubricated sector shape pad thrust bearings incorporating the variable depth’s pockets/textures have been presented. The variable depth texture comprises of combination of grooves and pockets. Fixed depth pocket, variable depth pocket (depth of the pocket reducing towards the exit) and combination of fixed and variable depth pocket with the fixed and variable depth grooves have been considered in the present investigation. With the aim to improve the performance parameters of fixed pad thrust bearing, the effect of texture parameters such as pocket/groove depth, the circumferential extent of texture and different combinations of variable depth’s pocket and grooves have been investigated. Substantial improvement in the performance parameters (minimum film thickness and coefficient of friction) has been achieved in the presence of proposed textures having variable depths of micro-geometries.

The demand for miniature precision products is growing rapidly in many industries, which stimulates the need for efficient manufacturing technologies. Micro-milling is the most versatile process for micromachining metals and alloys. Micro-milling is characterized by difficult chip formation conditions and high specific cutting forces. When machining such difficult-to-machine materials as nitinols, these negative effects are significantly amplified due to their special physical and mechanical properties. Therefore, the study of nitinol micro-milling processes to ensure high machining efficiency is a very important issue for the current level of machining technologies. This work is devoted to the development of a finite-element model of machining a groove on the flat surface of a nitinol workpiece (Ni56,5Ti43,5 by weight) with a two-tooth carbide micro-mill in the Deform-3D program. The methodology of model development is described step by step. The features of preparing CAD models of the workpiece and the cutting tool, setting the tool properties, determining the model of the behaviour of the machined material, generating a finite element mesh, and setting the contact conditions are considered. As a result of the finite element modelling of the process of dry micro-milling of nitinol with a 1 mm diameter tool, the cutting forces for the following machining conditions were determined: cutting speed 20 m/min, cutting depth 0.2 mm, feed per tooth 0.003 mm. The adequacy of the developed model was confirmed by comparison with the results of the experimental measurements of cutting forces for the same machining conditions. The developed finite-element model of micro-milling will be used to further optimize the technological parameters of nitinol cutting in order to increase the efficiency of the micromachining process of this material.

The work is devoted to the study of the formation of stress concentrators on the inner surfaces of "tube"-type parts, the main function of which is to ensure the minimum consumption of fracture energy under the influence of tensile loads. The work shows the effectiveness of the application of deforming broaching (stitching) and technological lubricant specially developed for forming stress concentrators under the action of high contact loads, which are accompanied by deformation. The patterns of deformation hardening of the material during the formation of longitudinal grooves on the inner surfaces of parts such as bushings by deforming broaching are studied. At the qualitative level, the influence of technological parameters of the process on the distribution of microhardness along the depth of the wall of the processed part and along the cross-section profile of the tool was established. The identified regularities can be used in the design of technological operations of forming grooves by methods of cold plastic deformation and correction of technological regimes based on the requirements for mechanical characteristics that ensure the efficiency of product use. The studied regularities are valid for forming grooves in tubular products made of structural steels with a hardness in the range of HB 110-200.

Stall, a complex flow phenomenon in centrifugal pump, plays a crucial role in pump safety and stability under part-load conditions. In this paper, a verified numerical simulation method is employed to analyze the three-dimensional flow field under the stall inception conditions. The results reveal the initial stall vortex occurs near the Q=0.7Qd condition in the prototype impeller. Based on stall formation mechanism, the high-velocity fluid near the blade pressure side is sucked into suction side of next impeller channel by setting a groove near the blade leading edge. This jet flow can prevent the narrow vortices near the impeller shroud from moving towards the blade suction side, thereby suppressing the formation of stall vortex. By comparing the effects of different groove locations, directions, and sizes on stall vortex control, the optimal groove width is determined to be approximately 1mm. Compared with the prototype impeller, the grooved impeller can completely eliminate the stall vortex and significantly reduce pressure pulsation under part-load conditions. Moreover, the head of grooved impeller is increased by nearly 15% under Q=0.6Qd condition, and the potential suppression mechanism is also explained. Based on the stall formation mechanism, this paper puts forward an effective stall control method, which delays the stall inception significantly. [ABSTRACT FROM AUTHOR]

Copyright of China Sciencepaper is the property of China Sciencepaper and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, a numerical optimization study of single-groove casing treatment was conducted on a high-speed axial compressor. One of the aims is to find the optimal structure of a single groove that can improve compressor stability with minimal loss in efficiency. Another aim is to explore suitable parameters for rapidly evaluating the compressor stall margin. A design optimization platform has been constructed in this paper, which utilizes NSGA-II and a Radial Basis Function (RBF) neural net model to carry out the optimization. The stall margin of the compressor with A single groove was accurately determined by calculating its entire overall performance line. A Pareto front is obtained through optimization, and the optimal design can be selected from the Pareto front. By considering both stall margin and efficiency loss, one of the optimal designs was found to achieve a 7.49% improvement in stall margin with a 0.24% improvement in peak efficiency. Based on the database, the effect of design parameters of a single groove on compressor stability and performance is analyzed. A series of evaluation parameters of stall margin were compared to their degree of correlation with the real stall margin calculated by the entire overall performance line. As a result, tip blockage and momentum ratio can be used as efficient parameters for quickly evaluating the compressor stall margin without the need to calculate the entire performance curve of the compressor. [ABSTRACT FROM AUTHOR]

Frictionally induced vibrations in rubber are readily triggered due to their lower stiffness and higher elasticity. This study developed a numerical model to investigate the frictional vibration of a rubber block with a groove on its side surface against an aluminum disc. The results indicate that a backside groove (GB) on the block significantly enhances vibration attenuation, with a decay time 0.6 s faster than a non-grooved (NG) block, despite a potentially higher initial vibrational amplitude. In contrast, a frontside groove (GF) results in persistent frictional oscillations, with the steady-state time being similar for both GB and GF configurations. The underlying mechanism is attributed to the GB's effectiveness in reducing the maximum energy imparted to the block initially, dissipating vibrational energy more swiftly, and distributing the contact stress more uniformly. The discrepancies in frictional forces between the conducted experiment and the simulation for the NG, GB and GF cases were 11.3%, 9.3% and 12.1%, respectively, quantitatively indicating the moderate precision of the results from the simulation. The insights gained from this study hold promise for enriching methods of mitigating vibrations arising from rubber friction. [ABSTRACT FROM AUTHOR]

This article addresses a root cause of transmission shaft failure that has potential to stall the transmission function at field applications. The broken shaft from an automotive power-shift transmission is collected from the field and examined. This investigation is carried out through visual inspection, material characterization, metrology inspection and finite element analysis. The broken shaft is observed with various ratchet marks that are normal to shaft axis. The fracture surface is observed with fatigue striations that indicates the shaft experiences cyclic load that propagated the cracks and caused fatigue damage. The failure initiation point on the broken surface is identified as the grinding relief groove that is manufactured at unpremeditated region. Numerical models are developed using Nx NASTRAN software to get better insights on the failure mechanism. The result shows the groove increased the local stress concentration during loading and reduced the safety factor of shaft design. The numerical model predictions are reasonably correlated with the broken shaft that provide greater insights about the failure mechanism. Based on this investigation, a proposal for the shaft design is suggested to avoid further failure in the component. [ABSTRACT FROM AUTHOR]

When speaking about music, the term groove can refer to objective qualities, such as rhythmic patterns, or to subjective experiences, such as the pleasurable urge to move to the music. However, the mere juxtaposition of objective musical causes and subjective psychological effects may be too simplistic to fully capture the multifaceted groove phenomenon. We therefore broaden the perspective of groove research by analyzing how people use the term groove in the everyday language of 970,220 comments on 155 YouTube music videos. The corresponding songs were previously rated on groove, operationalized as a pleasurable urge to move. Results show that groove terms were more likely to be used in comments on songs that received higher groove ratings. Resonating with the definition of groove as a pleasurable urge to move, groove terms were very likely to co-occur with movement terms, and comments mentioning groove expressed more positive sentiments. We also found that groove terms were predominantly used to describe objective musical qualities in comments on funk, soul, and R&B songs, suggesting that the use of groove is related to genre. In general, we demonstrate how text mining can be used to review existing definitions and gain new perspectives on current topics in music science. [ABSTRACT FROM AUTHOR]

Stall, a complex flow phenomenon in centrifugal pump, plays a crucial role in pump safety and stability under part-load conditions. In this paper, a verified numerical simulation method is employed to analyze the three-dimensional flow field under the stall inception conditions. The results reveal the initial stall vortex occurs near the Q=0.7Qd condition in the prototype impeller. Based on stall formation mechanism, the high-velocity fluid near the blade pressure side is sucked into suction side of next impeller channel by setting a groove near the blade leading edge. This jet flow can prevent the narrow vortices near the impeller shroud from moving towards the blade suction side, thereby suppressing the formation of stall vortex. By comparing the effects of different groove locations, directions, and sizes on stall vortex control, the optimal groove width is determined to be approximately 1mm. Compared with the prototype impeller, the grooved impeller can completely eliminate the stall vortex and significantly reduce pressure pulsation under part-load conditions. Moreover, the head of grooved impeller is increased by nearly 15% under Q=0.6Qd condition, and the potential suppression mechanism is also explained. Based on the stall formation mechanism, this paper puts forward an effective stall control method, which delays the stall inception significantly.

This study searches for an effective cross-sectional shape of grooves by evaluating their trapping effect using numerical methods. Grooves are widely employed to enhance lubrication performance across various systems, including in bearings and valves, where they serve multiple functions, such as improving load-carrying capacity, addressing pressure imbalances, storing lubricant, and minimizing leakage. Beyond these roles, grooves are crucial in preventing three-body abrasive wear by capturing solid particles, such as wear debris, within the system. This study specifically focuses on the trapping effect of grooves, examining how variations in their cross-sectional shape and the Reynolds number of the lubricant used influence this effect. To evaluate the groove’s trapping capability, the study analyzed particle trajectories and streamlines within the groove, as well as the number of particles effectively trapped. The results indicate that grooves with certain cross-sectional shapes, particularly those generating multiple vortices and small eddy currents, demonstrate superior trapping effectiveness. These findings contribute to the design of more efficient grooves in lubrication systems, providing insights into how groove geometry can be optimized to enhance the performance and longevity of mechanical components by mitigating wear through effective particle entrapment. This research has potential applications in the design and improvement of lubrication systems where managing wear and enhancing efficiency are critical concerns.

Performance behaviours of oil-lubricated sector shape pad thrust bearings incorporating the variable depth's pockets/textures have been presented. The variable depth texture comprises of combination of grooves and pockets. Fixed depth pocket, variable depth pocket (depth of the pocket reducing towards the exit) and combination of fixed and variable depth pocket with the fixed and variable depth grooves have been considered in the present investigation. With the aim to improve the performance parameters of fixed pad thrust bearing, the effect of texture parameters such as pocket/groove depth, the circumferential extent of texture and different combinations of variable depth's pocket and grooves have been investigated. Substantial improvement in the performance parameters (minimum film thickness and coefficient of friction) has been achieved in the presence of proposed textures having variable depths of microgeometries. [ABSTRACT FROM AUTHOR]

THE TIME PROJECT: TIMING AND SOUND IN Musical Microrhythm (2017-2022) studied microrhythm; that is, how dynamic envelope, timbre, and center frequency, as well as the microtiming of a variety of sounds, affect their perceived rhythmic properties. The project involved theoretical work regarding the basic aspects of microrhythm; experimental studies of microrhythm perception, exploring both stimulus features and the participants’ enculturated expertise; observational studies of how musicians produce particular microrhythms; and ethnographic studies of musicians’ descriptions of microrhythm. Collectively, we show that: (a) altering the microstructure of a sound (‘‘what’’ the sound is) changes its perceived temporal location (‘‘when’’ it occurs), (b) there are systematic effects of core acoustic factors (duration, attack) on microrhythmic perception, (c) microrhythmic features in longer and more complex sounds can give rise to different perceptions of the same sound, and (d) musicians are highly aware of microrhythms and have developed vocabularies for describing them. In addition, our results shed light on conflicting results regarding the effect of microtiming on the ‘‘grooviness’’ of a rhythm. Our use of multiple, interdisciplinary methodologies enabled us to uncover the complexity of microrhythm perception and production in both laboratory and realworld musical contexts. [ABSTRACT FROM AUTHOR]

This paper reports on an experiment that investigated how guitarists signal the intended timing of a rhythmic event in a groove-based context via three different features related to sound-producing motions of impulsive chord strokes (striking velocity, movement duration and fretboard position). 21 expert electric guitarists were instructed to perform a simple rhythmic pattern in three different timing styles—"laidback," "on-the-beat," and "pushed"—in tandem with a metronome. Results revealed systematic differences across participants in the striking velocity and movement duration of chords in the different timing styles. In general, laid-back strokes were played with lower striking velocity and longer movement duration relative to on-the-beat and pushed strokes. No differences in the fretboard striking position were found (either closer to the "bridge" [bottom] or to the "neck" [head]). Correlations with previously-reported audio features of the guitar strokes were also investigated, where lower velocity and longer movement duration generally corresponded with longer acoustic attack duration (signal onset to offset).

First described by Schachter & Singer (1962), the phenomenon of misattributed arousal (arousal perceived as coming from a wrongly presumed source and irrelevantly influencing evaluations of it) has been widely documented, with two recent studies, Marin, Schober, Gingras, & Leder (2017) and Chang et al. (2021), providing suggestive evidence of music as a source of misattributed arousal with an enhancing effect on sexual attraction. The aim of the present study was to provide more unambiguous evidence of such a musical arousal effect. In an online experiment simulating a face-to-face dating event, participants (41 females and 43 males) rated the attractiveness of opposite-sex faces in a series of slideshows presented twice, once accompanied by a high-groove drum track and the other time by a low-groove drum track. They then rated the drum tracks for groove. While whole-sample analyses yielded no significant findings, subsample analyses showed that the groove ratings of the male participants, though not the female participants, positively predicted their attractiveness ratings, in partial support of the arousal hypothesis. We discuss possible reasons for the pattern of findings, including sex differences in groove response and more generally in the evaluation of cues of physiological arousal.

Motivation for bodily movement, physical activity and exercise varies from moment to moment. These motivation states may be "affectively-charged," ranging from instances of lower tension (e.g., desires, wants) to higher tension (e.g., cravings and urges). Currently, it is not known how often these states have been investigated in clinical populations (e.g., eating disorders, exercise dependence/addiction, Restless Legs Syndrome, diabetes, obesity) vs. healthy populations (e.g., in studies of motor control; groove in music psychology). The objective of this scoping review protocol is to quantify the literature on motivation states, to determine what topical areas are represented in investigations of clinical and healthy populations, and to discover pertinent details, such as instrumentation, terminology, theories, and conceptual models, correlates and mechanisms of action. Iterative searches of scholarly databases will take place to determine which combination of search terms (e.g., "motivation states" and "physical activity"; "desire to be physically active," etc.) captures the greatest number of relevant results. Studies will be included if motivation states for movement (e.g., desires, urges) are specifically measured or addressed. Studies will be excluded if referring to motivation as a trait. A charting data form was developed to scan all relevant documents for later data extraction. The primary outcome is simply the extent of the literature on the topic. Results will be stratified by population/condition. This scoping review will unify a diverse literature, which may result in the creation of unique models or paradigms that can be utilized to better understand motivation for bodily movement and exercise.

The article is devoted to the development and analysis of a model of the motion of a micropolar lubricant in the working gap of a radial plain bearing with a fluoroplastic-containing antifriction composite polymer coating and with a groove on the supporting surface. New models are obtained on the basis of classical equations in the «thin layer» approximation and the continuity equation, which describes the turbulent mode of motion of a lubricant with micropolar rheological properties. The results of the numerical analysis of the obtained models of existing operational characteristics made it possible to obtain a quantitative assessment of the effectiveness of the support profile with a fluoroplastic-containing antifriction composite polymer coating with an axial groove. To complete the complex of studies and verify theoretical developments, experimental studies are carried out. The novelty of the work lies in the concretization of the technique of engineering calculations for the design of an effective radial bearing with an antifriction polymer coating with an axial groove on the bearing surface of the bearing bush, taking into account the dependence of the rheological properties of a micropolar lubricant on pressure and temperature in a turbulent mode, which makes it possible to estimate the value of the main operational characteristics: hydrodynamic pressure, load ability and coefficient of friction, as well as to expand the scope of practical application of models for engineering calculations. Thus, the design of a radial bearing with a polymer-coated support profile, a groove 3 mm wide, ensured a stable ascent of the shaft on a hydrodynamic wedge, which experimentally confirmed the correctness of the results of theoretical studies of a radial bearing with a diameter of 40 mm at a sliding speed of 0,32–3 m/s, load 4,9–24,5 MPa.

In modern heavy-loaded friction units, various types of antifriction coatings are used on the surface of the bearing profile of the bearing sleeve to ensure high load-bearing capacity and increase the duration of the hydrodynamic regime, and consequently, the economic effect of sliding bearings. In the study, the creation and development of mathematical models of a radial sliding bearing with an antifriction polymer coating of the support surface containing a groove is carried out. The key role here is played by the method of analytical forecasting, which determines the mechanism of friction and the conditions for its transition from boundary to liquid. The aim of the study is to develop a mathematical model of a radial sliding bearing with a polymer coating of the bearing sleeve bearing surface containing an axial groove to predict the economic effect. The objective of the study is to develop new mathematical models and analyze the movement of lubricant in the working gap of a radial sliding bearing, taking into account design features to predict the economic effect. The difference from the existing models of tribosystems with antifriction coatings is the presence of a groove, which ensures stable ascent of the shaft on the hydrodynamic wedge and reduces wear during start-up and run-outs, hence increasing the service life of tribosystems. Using the lubricant motion equation and the continuity equation, new mathematical models are obtained that take into account the design features of the bearing sleeve surface – polymer coating, groove width, rheological properties of the lubricant used. Based on the results of an experimental study on the AI 5018 friction machine, the economic efficiency of net discounted income was calculated on samples in the form of partial inserts. As a result of the research, new mathematical models for engineering calculations have been developed that allow predicting the efficiency, reliability and duration of the hydrodynamic lubrication regime, as well as determining the main tribotechnical parameters. Net discounted income based on the results of theoretical and experimental research is estimated at 0.36 million rubles per year.

This study applied femtosecond laser processing technology to prepare microgrooves on the surface of SiC/SiC ceramic matrix composites (CMCs). The corresponding parameter ranges for response surface optimization were determined through single-factor experiments. Additionally, four quadratic regression models were established to predict surface roughness, groove width, groove depth, and volume material removal rate. The Analysis of Variance (ANOVA) revealed that the developed model was reliable. Additionally, the study investigated the effects of laser parameters such as power, scanning speed, and defocusing amount, as well as their interactions, on various outcome measures, including the roughness average (Ra), groove width, groove depth, and volume material removal rate (VRR). To optimize the process parameters, the response surface method was employed to achieve maximum VRR and minimum Ra. After conducting the analysis, the optimal processing parameters were determined to be a laser power of 36 W, a scanning speed of 24 mm/s, and a defocusing amount of −1.17 mm. The developed model accurately predicts groove depth, width, volume material removal rate, and surface roughness in SiC/SiC-CMCs processing. The relative deviations between the actual and expected values fall within the acceptable range, affirming model's reliability. This indicates that the model improves precision in predicting these parameters for SiC/SiC-CMCs processing. The findings of this study have significant implications for improving the processing quality and efficiency of SiC/SiC-CMCs and establishing a relationship between processing parameters and responses. These insights can inform future research efforts to optimize these complex materials' manufacturing processes. • A Multiple regression equation prediction model between laser processing parameters and output response is developed. • The effect of laser processing parameters on response under multiple factors is explored. • The optimal parameters within the selected parameter range are set based on response surface methodology. • Micro-grooves are fabricated by femtosecond laser on SiC/SiC composites. [ABSTRACT FROM AUTHOR]

This paper sought to demonstrate how the idea of groove produces specific musical performances of the double bass in samba and to understand the conceptual field through which double bassists construct this phenomenon within the musical culture. The methodology identified interpretative resources from data collected in an experiment involving 19 instrumentalists. The subjects were instructed to construct improvised bass lines over a harmonic structure presented a priori. The musical events present in each instrumentalist's recordings were annotated, classified, and analyzed with computational data visualization resources. The results show an interpretation map where the idea of groove is expressed in the samba rhythm with the use of interpretative resources and specific techniques such as ghost notes and slaps. Strategies of temporal and sequential structuring of technical resources were also presented, enriching the understanding of the groove phenomenon in the specific practice of bassists in samba. [ABSTRACT FROM AUTHOR]

In this study, through numerical simulation, an effort has been made to acknowledge the efficiency of machining Titanium grade 23 under vibration assistance with textured cutting tools. Dry turning experiments with commercially available carbide inserts without texturing were carried out without vibration assistance. Cutting forces (F x , F y , F z ) were observed during experimentation, which were further validated using DEFORM 3D. The forces were validated using DEFORM 3D. Closer to the cutting edge, dimple type 1, dimple type 2, horizontal, and vertical patterns were made on cutting inserts using SOLIDWORKS software. A numerical model based on experimentation was developed employing DEFORM 3D software for conventional and vibration-assisted turning. Cutting forces (F x , F y , F z ), cutting temperature, tool wear, and the mechanism of chip formation were also explored through FEM investigation. Micro-textured inserts were found to be enhancing machinability. Machining with vibration assistance also improved machinability. The study found that textured tools improved machinability in conventional and vibration-assisted machining modes. The effect of textured tools on machinability improved with vibration-assisted machining. The numerical analysis revealed that dimple type 1 and vertical grooved tool improved the machinability of Titanium grade 23. [ABSTRACT FROM AUTHOR]

Groove is a popular and widely used concept in the field of music. Yet, its precise definition remains elusive. Upon closer inspection, groove appears to be used as an umbrella term with various connotations depending on the musical era, the musical context, and the individual using the term. Our aim in this article was to explore different definitions and connotations of the term groove so as to reach a more detailed understanding of it. Consequently, in an online survey, 88 participants provided free-text descriptions of the term groove. A thematic analysis revealed that groove is a multifaceted phenomenon, and participants' descriptions fit into two main categories: music- and experience- related aspects. Based on this analysis, we propose a contemporary working definition of the term groove as used in the field of music psychology: "Groove is a participatory experience (related to immersion, movement, positive affect, and social connection) resulting from subtle interaction of specific music- (such as time- and pitch-related features), performance-, and/or individual-related factors." Importantly, this proposed definition highlights the participatory aspect of the groove experience, which participants frequently mentioned, for example describing it as an urge to be "involved in" the music physically and/or psychologically. Furthermore, we propose that being immersed in music might be a prerequisite for other experiential qualities of groove, whereas the social aspect could be a secondary quality that comes into play as a consequence of musical activity. Overall, we anticipate that these findings will encourage a greater variety of research on this significant yet still not fully elucidated aspect of the musical experience. [ABSTRACT FROM AUTHOR]

This paper is devoted to the important problem of increase in the wear resistance of a radial bearing that operates in the hydrodynamic mode due to applying an antifriction polymer composite coating with an axial groove, which has truly viscous properties, on a nonstandard bearing bush adapted to friction conditions. The dependence of the rheological properties of a lubricant under turbulent friction on the pressure and temperature is considered. As a result, the velocity and pressure fields in the axial groove and on the surface of the polymer antifriction composite coating have been determined, as have the load capacity and friction force, which make it possible to increase the load capacity, reduce the friction coefficient (increase the wear resistance), and also increase the duration of the hydrodynamic mode. The results of numerical analysis of theoretical models and experimental study of the suggested design are presented to verify and confirm the effectiveness of the models obtained. [ABSTRACT FROM AUTHOR]

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Internal combustion engines, during their operation, subject the piston to high-temperature and high-pressure conditions, requiring it to endure intense, continuous reciprocating motion. This strenuous process leads to significant wear and tear. Among the engine's crucial components, the piston ring plays a pivotal role but is particularly susceptible to wear. Therefore, extensive research has been devoted to investigating the wear of piston rings, a critical sealing component within internal combustion engines. To address the high cost of existing coating methods, which hinders widespread application, we propose a bionic design approach inspired by groove structures observed on earthworm bodies, aimed at enhancing the wear resistance of piston rings. Bionic piston rings featuring optimally designed groove structures inspired by the earthworm's anatomy were designed. These rings exhibited varying groove depths (1 mm, 2 mm, and 3 mm), groove widths (0.1 mm, 0.3 mm, and 0.5 mm), and groove spacings (0.1 mm, 0.2 mm, and 0.3 mm). We conducted thermal–structural coupling analyses on both standard piston rings and these bionic counterparts. The results revealed that the maximum stress was concentrated at the first piston ring, precisely at the opposing region of the end gap. Thus, the initial piston ring endured the primary frictional losses. Moreover, a comparison of stress levels between bionic rings and the standard ring revealed that the bionic groove structure substantially reduced stress and minimized stress concentration, thus enhancing wear resistance. Groove width had the most notable influence on wear performance, followed by groove depth and groove spacing. Optimal wear resistance was achieved when the groove depth was 3 mm, groove width was 0.1 mm, and groove spacing was 0.1 mm. Subsequently, we constructed a piston ring friction test bench to validate the wear resistance of the most effective piston ring. The results indicated that the wear resistance of the bionic piston ring exceeded that of the standard piston ring by up to 19.627%. Therefore, incorporating a bionic groove structure within the piston ring can effectively reduce surface friction and enhance wear resistance. This, in turn, can enhance the operational lifespan of internal combustion engines under favorable working conditions. [ABSTRACT FROM AUTHOR]

In this paper, a numerical optimization study of single-groove casing treatment was conducted on a high-speed axial compressor. One of the aims is to find the optimal structure of a single groove that can improve compressor stability with minimal loss in efficiency. Another aim is to explore suitable parameters for rapidly evaluating the compressor stall margin. A design optimization platform has been constructed in this paper, which utilizes NSGA-II and a Radial Basis Function (RBF) neural net model to carry out the optimization. The stall margin of the compressor with A single groove was accurately determined by calculating its entire overall performance line. A Pareto front is obtained through optimization, and the optimal design can be selected from the Pareto front. By considering both stall margin and efficiency loss, one of the optimal designs was found to achieve a 7.49% improvement in stall margin with a 0.24% improvement in peak efficiency. Based on the database, the effect of design parameters of a single groove on compressor stability and performance is analyzed. A series of evaluation parameters of stall margin were compared to their degree of correlation with the real stall margin calculated by the entire overall performance line. As a result, tip blockage and momentum ratio can be used as efficient parameters for quickly evaluating the compressor stall margin without the need to calculate the entire performance curve of the compressor.

The urge to move to music (groove) depends in part on rhythmic syncopation in the music. For adults, the syncopation‐groove relationship has an inverted‐U shape: listeners want to move most to rhythms that have some, but not too much, syncopation. However, we do not know whether the syncopation‐groove relationship is relatively sensitive to, or resistant to, a listener's experience. In two sets of experiments, we tested whether the syncopation‐groove relationship is affected by dance experience or changes through development in childhood. Dancers and nondancers rated groove for 50 rhythmic patterns varying in syncopation. Dancers' and nondancers' ratings did not differ (and Bayesian tests provided substantial evidence that they were equivalent) in terms of mean groove and the optimal level of syncopation. Similarly, ballet and hip‐hop dancers' syncopation‐groove relationships did not differ. However, dancers had more robust syncopation‐groove relationships (higher goodness‐of‐fit) than nondancers. Children (3–6 years old) completed two tasks to assess their syncopation‐groove relationships: In a 2‐alternative‐forced choice task, children compared rhythms from 2 of 3 possible levels of syncopation (low, medium, and high) and chose which rhythm in a pair was better for dancing. In a dance task, children danced to the same rhythms. Results from both tasks indicated that for children, as for adults, medium syncopation rhythms elicit more groove than low syncopation rhythms. A follow‐up experiment replicated the 2‐alternative‐forced choice task results. Taken together, the results suggest the optimal level of syncopation for groove is resistant to experience, although experience may affect the robustness of the inverted‐U relationship. Research Highlights: In Experiment 1, dancers and nondancers rated groove (the urge to move) for musical rhythms, demonstrating the same inverted‐U relationships between syncopation and groove.In Experiment 2, children and adults both chose rhythms with moderate syncopation more than low syncopation as more groove‐inducing or better for dancing.Children also danced more for moderate than low syncopation, showing a close perception‐behavior relationship across tasks.Similarities in the syncopation‐groove relationship regardless of dance training and age suggest that this perceptual and behavioral groove response to rhythmic complexity may be quite resistant to experience. [ABSTRACT FROM AUTHOR]

This article proposes a model that unites a broad range of performances of Mande drumming music within a single cohesive and fluid sub-beat metric framework. The framework categorizes musical performance in terms of two metric modes, each of which includes a set of metric cycles featuring non-isochronous pulsations. A novel feature of the proposed model that distinguishes it from previous research is that it frames metric non-isochrony in terms of the ranges for pulsation positions within a pulsation cycle. This approach is shown to be especially useful for analyzing and describing mechanisms of metrical change and transformation and for connecting seemingly distinct phenomena and repertoire. [ABSTRACT FROM AUTHOR]