Elevated Speed Research Articles

Modelling the potential effects of climate factors on Dubas bug (Ommatissus lybicus) presence/absence and its infestation rate: A case study from Oman.

Ommatissus lybicus de Bergevin (Hemiptera: Tropiduchidae) (Dubas Bug, DB) is an insect pest attacking date palms. It occurs in Arab countries including Oman. In this paper, the logistic, ordinary least square, and geographical weighted regressions were applied to model the absence/presence and density of DB against climate factors. A method is proposed for modelling spatially correlated prorations annually over the study period, based on annual and seasonal outbreaks. The historical 2006-2015 climate data were obtained from weather stations located in nine governorates in northern Oman, while dataloggers collected the 2017 microclimate data in eight of these nine governorates. Logistic regression model showed the percentages of correctly predicted values using a cut-off point of 0.5 were 90%, 88% and 84%, indicating good classification accuracy. OLS and GWR models showed an overall trend of strong linear correlation between DB infestation levels and short- and long-term climate factors. The three models suggested that precipitation, elevation, temperature, humidity, wind direction and wind speed are important in influencing the spatial distribution and the presence/absence of dense DB populations. The results provide an improved understanding of climate factors that impact DB's spread and is considered useful for managing DB infestations in date palm plantations. © 2019 Society of Chemical Industry.

Common moist diet replacement to promote sustainable Cobia Rachycentron canadum (Linnaeus) near- shore farming in Brazil

ABSTRACT: Cobia is one of the most promising warm water aquaculture species. In Brazil, cobia farming began in 2008 in the state of Rio de Janeiro from experimental scale facilities to regular near-shore farms based on fresh/frozen fish diets composed mostly of Sardinella sp. Despite the encouraging results achieved in the promotion of sustainable cobia farming, we advocate the replacement of fresh/frozen fish by a practical formulated feed. This experiment evaluated the zootechnical performance and environmental efficiency of moist and practical formulated feeds in early grow-out phases in the cycle of cobia nearshore cage culture. Four hundred and twenty juvenile cobia (151 ± 7 g) were fed with moist feed and practical formulated feed for 56 days. Biometrics were taken every two weeks and diets were analyzed for proximate composition, fatty acid composition and pellet quality. Although growth performance was equivalent between treatments, feed consumption and feed conversion ratios (FCR) were different (p < 0.05) and varied according to water temperature. Cobia fed moist feed exhibited an FCR two times higher than those fed formulated feed. Elevated settling speed and low floatability contributed to higher heterogeneity and lower efficiency of fish fed moist diet. Nitrogen excretion rate was reduced (64 %) and protein efficiency ratio elevated (27 %) within formulated diet groups in comparison to those fed moist diet (79 % and 15 %, respectively). The fatty acid profile of cobia muscle was similar across the groups. With no negative effects of diet substitution on production performance and improvement of environmental efficiency, this approach can be applied and advocated globally and contribute to the responsible intensification of sustainable marine fish culture.

A theoretical investigation on characteristic frequencies of ground vibrations induced by elevated high speed train

High speed railway is an ever-expanding mega project in China, connecting more and more cities of economy importance. This paper presents a theoretical evaluation on vibrations of saturated ground induced by high speed train operating on an elevated bridge. The simply-supported bridge consisting of a slab railway track resting on multiple spans of box girder is treated using the periodic theory. While, the dynamic interaction between the piles and the ground halfspace is solved using the flexible volume method combing with thin layer element method developed by the authors for the saturated soil. Two characteristic frequencies of the superstructure that dominates the ground displacement response have been identified: one is the first natural frequency of girder beam with elastic bearings; the other is the first natural frequency of pier beam supported by the pile foundation.

A Study on the role of Oil-Air Mist Lubrication on an Ultrahigh-Speed Bio-Generator

Abstract The significance of economical exploitation of resources has brought a need for compact and efficient electromechanical systems and electrical machines. The electrical machines such as bio-generators need to be featured with high power densities and high efficiencies with lower excitation losses, magnetizing currents and rotor losses. However, the research progress has often been challenged by the ultrahigh-speed bio-generator knowhow as the design must be dealt with factors: i) “DN” rating of value ∼ 1.5X 106 and above ii) high value of “kW/speed” rating. Furthermore, the thermal management of ultrahigh-speed bio-generator is difficult and complicated as the temperature rise in high-speed bio-generator facilitates demagnetization cascading to the reduction of the output power. The output of research portrays the use of pressurized oil-air particles as a lubrication method on an ultrahigh speed bio-generator to avoid thermal damage and starvation at the rolling element and to address the predominant concern which is effective cooling of ultra-precision ball bearings even at elevated speeds. The ultrahigh-speed generator was designed and developed to operate at a maximum speed of ∼30000 RPM to deliver 10kW output power and expected to 80∼92°C temperature rise with ∼2 kW idle power consumption enough to cause a severe impact to the rolling elements of the bearing. The newly developed oil-air mist lubrication arrangement enables to control the temperature rise at the rolling element and ensures the use of ultrahigh speed conditions for the bio-generator

Single Point Incremental Forming and Electrospinning to produce biodegradable magnesium (AZ31) biomedical prostheses coated with porous PCL

Single Point Incremental Forming (SPIF) is a technology that allows producing highly customized products using conventional computer numerical control machines (CNC). Magnesium is a biocompatible and biodegradable metal with mechanical properties close to those of cortical bones: it can be a viable solution for producing temporary biomedical prostheses, avoiding a second surgery to remove it. Its major drawback is its poor formability at room temperature and low corrosion resistance. The first problem can be solved working at temperatures higher than the room one; the second, by coating the Mg substrate with a higher corrosion resistant material. In this work, Mg alloy sheets (AZ31B) were formed by SPIF at elevated spindle speeds (in order to locally heat the part by friction); in addition, a thin layer of PCL was deposited by electrospinning on the SPIFed parts. A porous coating was thus obtained: this morphology resembles the extracellular matrix of the body and promotes cell growth for tissue healing or even the electrospun fibers ofPCL could be drug releaser for infection reduction. Cytotoxicity tests performed in this work revealed that oxides produced by the SPIF process delay the cytotoxic effect of the as received Mg alloy, while the presence of the PCL coating had a positive effect on the corrosion of the investigated Mg alloy

The effect of door structural stiffness and flexural components to the interior wind noise at elevated vehicle speeds

Vehicle interior noise level is the sum of the structure borne and air borne noises created on the road. Structure borne noises become less important at higher speeds and the airflow around the vehicle create the airborne wind noise. When the airflow comes across with the side mirrors, eddy currents create turbulent flow at the back of the mirror and near the A-pillar. Since the aerodynamic flow conditions frequently changes on the road (weather conditions, road obstacles, etc.), aerodynamic forces arise on the vehicle door. This aerodynamic door pressure distributions leads to complicated vibrations and increases interior noise level. The level of the wind noise conveyed from side door window sealing to the vehicle interior has a very significant effect on the customer’s perception of vehicle overall quality. In the present study, aspiration noise induced by sealing gap between the door and the sealing was investigated. Aerodynamic forces were calculated by CFD simulations at different speeds of vehicle and then door deformations caused by these aerodynamic forces were calculated. On the other hand, physical door deformations were measured on the road to digitize the perceived interior noise. The correlation between the sealing gap and the perceived interior noise level was expressed by examining the door stiffness and sealing pressure on the door.

The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed

Abstract. A fundamental understanding of the processes that control Antarctic aerosols is necessary in determining the aerosol impacts on climate-relevant processes from Antarctic ice cores to clouds. The first in situ observational online composition measurements by an aerosol mass spectrometer (AMS) of Antarctic aerosols were only recently performed during the Two-Season Ozone Depletion and Interaction with Aerosols Campaign (2ODIAC). 2ODIAC was deployed to sea ice on the Ross Sea near McMurdo Station over two field seasons: austral spring–summer 2014 and winter–spring 2015. The results presented here focus on the overall trends in aerosol composition primarily as functions of air masses and local meteorological conditions. The results suggest that the impact of long-range air mass back trajectories on either the absolute or relative concentrations of the aerosol constituents measured by (and inferred from) an AMS at a coastal location is small relative to the impact of local meteorology. However, when the data are parsed by wind speed, two observations become clear. First, a critical wind speed is required to loft snow from the surface, which, in turn, increases particle counts in all measured size bins. Second, elevated wind speeds showed increased aerosol chloride and sodium. Further inspection of the AMS data shows that the increased chloride concentrations have more of a “fast-vaporizing” nature than chloride measured at low wind speed. Also presented are the Cl:Na ratios of snow samples and aerosol filter samples, as measured by ion chromatography, as well as non-chloride aerosol constituents measured by the AMS. Additionally, submicron aerosol iodine and bromine concentrations as functions of wind speed are also presented. The results presented here suggest that aerosol composition in coastal Antarctica is a strong function of wind speed and that the mechanisms determining aerosol composition are likely linked to blowing snow.

Palladium Supported on Carbon Nanotubes Decorated Nickel Foam as the Catalytic Stirrer in Heterogeneous Hydrogenation of Polystyrene

Carbon nanotubes supported palladium (Pd/CNTs) catalyst displayed excellent activity toward hydrogenation of polystyrene (PS) to produce polycyclohexylethylene (PCHE) with added commercial values. However, its application is limited by the costly catalyst filtration process and energy-consuming elevated agitation speed. Herein, a dense, homogeneous and strongly attached layer of CNTs was decorated on nickel foams and employed as the catalyst support for palladium nanoparticles. Structured catalyst (Pd/CNTs@NF) was directly used as the catalyst stirrer in a rotating foam stirrer reactor (RFSR) for PS hydrogenation. Owing to the enhanced mass-transfer process, the hydrogenation degree reached 68.8%, which was 45.1% higher than that obtained in a slurry reactor using powdered Pd/CNTs catalyst under identical reaction conditions. Outstanding attachment strength of CNTs on the foam and catalytic stability in eight runs of recycling were also demonstrated. This work elucidates the promising feasibility of struc...

Abstract 17: Controlled Progressive Elevation Maximizes Cerebral Perfusion Pressure During Head up CPR in a Swine Model of Cardiac Arrest

Background: Elevation of the head and thorax (HUP) during cardiopulmonary resuscitation (CPR) has been shown to result in a doubling of brain blood flow with higher Cerebral Perfusion Pressures (CerPP) after prolonged active compression-decompression (ACD) CPR with an impedance threshold device (ITD). However, the optimal angle and speed of elevation are unknown. Methods: In study A, in an anesthetized female 40 kg pig model of untreated ventricular fibrillation for 8 min, different HUP angles were assessed (20°, 30°, 40°) in a randomized manner each over a 5-minute periods of ACD+ITD CPR. Based upon study A results, study B was performed, wherein animals were randomized to the two following sequences: 20°, 30°, 40° or 40°, 30°, 20° using the same protocol. The primary endpoint was mean ± SD CerPP (mmHg) for both studies. Results: In study A, 18 pigs were studied. Overall, there was no optimal HUP angle: CerPP was 36 ± 19 for 20°, 42 ± 21 for 30°, and 44 ± 27 for 40° (p = 0.57). However, CerPPs were higher if 40 o HUP was performed during the last 5 minutes of the resuscitation (77 ± 17), versus 20 o HUP and 30 o HUP (44± 18, p = 0.003), suggestive of a sequence effect. To test this hypothesis, study B then enrolled additional animals to compare two elevation sequences 20°, 30°, 40° (n = 6) or 40°, 30°, 20° (n = 5). At 15 min of CPR, the CerPP for 20°, 30°, 40° group was 60 ± 17 and for 40°, 30°, 20° the CerPP was 23 ± 19 (p = 0.01). CerPPs were higher for the 20°, 30°, 40° group throughout the resuscitation (Figure 1). Coronary perfusion pressure was also significantly higher in the 20°, 30°, 40° group (50 ± 17 mmHg versus 22 ± 16 mmHg, p = 0.036) Conclusions: There did not appear to be an optimal HUP angle during ACD+ITD CPR. By contrast, there was an optimal HUP sequence (20,30,40) that resulted in significantly higher CerPP, suggesting controlled progressive elevation is important when performing HUP CPR as compared to an absolute immediate elevation of the head and thorax.

Keratin 6 regulates collective keratinocyte migration by altering cell-cell and cell-matrix adhesion.

The a and b isoforms of keratin 6 (K6), a type II intermediate filament (IF) protein, are robustly induced upon injury to interfollicular epidermis. We previously showed that complete loss of K6a/K6b stimulates keratinocyte migration, correlating with enhanced Src activity. In this study, we demonstrate that this property is cell autonomous, depends on the ECM, and results from elevated speed, enhanced directionality, and an increased rate of focal adhesion disassembly. We show that myosin IIA interacts with K6a/K6b, that its levels are markedly reduced in Krt6a/Krt6b-null keratinocytes, and that inhibiting myosin ATPase activity normalizes the enhanced migration potential of Krt6a/Krt6b-null cells. Desmoplakin, which mediates attachment of IFs to desmosomes, is also expressed at reduced levels and is mislocalized to the nucleus in Krt6a/Krt6b-null cells, correlating with defects in cell adhesion. These findings reveal that K6a/K6b modulate keratinocyte migration by regulating cell-matrix and cell-cell adhesion and highlight a role for keratins in collective cell migration.

Numerical study on the effect of elevator movement on pressure difference between vestibule and living room in high-rise buildings

In this study, we experimentally and numerically investigated the effect of elevator movement on the pressure difference between vestibule and living room regulated by the smoke control system in a high-rise building. The elevator and smoke control systems using supplied pressure dampers are considered one of the most important systems for safe evacuation. However, the pressure field and flow rate are strongly disrupted by elevator movement. Thus, they can affect the performance of smoke control systems and hinder evacuation. The experimental results of this study are used to validate the results of the numerical study when elevator is moving at low speed or is stationary. Then, the effect of elevator movement on the pressure difference between the vestibule and living room, which is controlled by the smoke control system, is investigated numerically using ANSYS CFX. The elevator speed is increased from 10 to 70 m/s, corresponding to the real elevator speed increase of 1.5 to 10 m/s based on Reynolds similarity. It is found that the higher the elevator speed, the greater the pressure difference between the vestibule and living room. This shows that the airflow rate should be actively changed by considering the location of the elevator and its speed. The empirical correlation between elevator movement and pressure difference is derived.

An online visible and near-infrared spectroscopic technique for the real-time evaluation of the soluble solids content of sugarcane billets on an elevator conveyor

The aim of this research study is to propose a prototype online detection system based on the visible and near-infrared spectroscopic (vis/SW-NIR) technique for the real-time evaluation of the soluble solids content (SSC) of sugarcane billets on an elevator conveyor. The system consisted of two main parts, a cane billet elevator and a spectral acquisition device. An elevator speed of 2 m/s was used for the transfer of sugarcane billets. Spectra acquisition was performed using four 50 W tungsten halogen lamps as a light source in conjunction with vis/SW-NIR spectrometer in reflectance mode. Partial least squares regression (PLSR) was subsequently used to correlate the spectra with the experimentally determined SSC values. The model performance was then assessed using an independent prediction set. The model was found to display a coefficient of determination of prediction (R2) of 0.785, a root mean square error of prediction (RMSEP) of 0.30 and a residual predictive deviation (RPD) of 2.16. The result on the prediction set confirm that the proposed system is suitable for the online SSC measurement of the sugarcane billets on an elevator conveyor.

Observations of the effects of benthic biology in measurements from the Acoustic Coring System collected in the New England Mud Patch

This paper presents in situ measurements of sediment sound speed and attenuation collected in the New England Mud Patch using the Acoustic Coring System (ACS) with comparisons to sound speed measurements from a multi-sensor core logger (MSCL). The ACS uses rod-mounted piezoelectric cylinders mounted below the penetrating tip of a gravity corer to obtain a continuous record of sound speed as a function of depth as the corer penetrates the seabed. The MSCL measurements of the recovered sediment cores were acquired in 2 cm increments. In both the ASC and MSCL measurements, an elevated sound speed is observed in the upper 25 cm of the seabed which is the portion of the seabed where most infauna live. The sediments collected in the cores were analyzed for density, porosity, bulk organic matter, carbonate content, mineral composition, and grain size. Additional surficial sediment samples recovered using a box core and a multi-core were sieved for infauna collection. The organisms were preserved, identified, and classified according to acoustically relevant traits. The acoustic measurements are interpreted in terms of the physical measurements of cores and the abundance of different types of organisms present in the seabed. [Work supported by ONR.]

Effects of tongue elevation speed and glottal flow control on the production of sibilant /s/

Effects of tongue elevation speed and glottal flow control on the production of sibilant /s/

A Truly Global Extreme Ultraviolet Wave from the SOL2017-09-10 X8.2+ Solar Flare-Coronal Mass Ejection

Abstract We report Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) observations of an extraordinary global extreme ultraviolet (EUV) wave triggered by the X8.2+ flare-CME eruption on 2017 September 10. This was one of the best EUV waves ever observed with modern instruments, yet it was likely the last one of such magnitudes of Solar Cycle 24 as the Sun heads toward the minimum. Its remarkable characteristics include the following. (1) The wave was observed, for the first time, to traverse the full-Sun corona over the entire visible solar disk and off-limb circumference, manifesting a truly global nature, owing to its exceptionally large amplitude, e.g., with EUV enhancements by up to 300% at 1.1 from the eruption. (2) This leads to strong transmissions (in addition to commonly observed reflections) in and out of both polar coronal holes (CHs), which are usually devoid of EUV waves. It has elevated wave speeds &gt;2000 within the CHs, consistent with the expected higher fast-mode magnetosonic wave speeds. The CHs essentially serve as new “radiation centers” for the waves being refracted out of them, which then travel toward the equator and collide head-on, causing additional EUV enhancements. (3) The wave produces significant compressional heating to local plasma upon its impact, indicated by long-lasting EUV intensity changes and differential emission measure increases at higher temperatures (e.g., ) accompanied by decreases at lower temperatures (e.g., ). These characteristics signify the potential of such EUV waves for novel magnetic and thermal diagnostics of the solar corona on global scales.

Synthesis and Tribological Properties of Bio-Inspired Nacre-Like Composites

Ceramic materials possessing the properties of high-strength and rigidity are widely used in industry. The shell nacre has a layered structure containing both macroscopic and microscopic levels and is equipped with superior qualities regarding hardness and strength. Therefore, the ceramic composites with a nacre-like layered structure have the potential to be utilized as sliding bearings employed in the harsh conditions of wells. For the purpose of this paper, a porous Al2O3 ceramics skeleton with nanometer powder is prepared using the freeze-casting method. Then the porous ceramic skeleton is filled with polymer polymethyl methacrylate (PMMA) through mass polymerization to produce a bionic Al2O3/PMMA composite with a lamellar structure. The properties of the prepared composite are determined by the analysis of micro-hardness, fracture toughness, friction coefficient, wear scar diameter, and the morphology of the worn surface. Consequent results indicate that elevation in the A12O3 powder, which acts as the initial solid phase content, prompts the ceramic slurry to exhibit an increase in viscosity and a gradual decrease in the pore size of the ceramic skeleton. The prepared layered Al2O3/PMMA composite possesses high fracture toughness, which closely resembles that of Al, is approximately four times that of the matrix of the Al2O3 ceramics and 16 times that of the PMMA. Three kinds of composites containing different solid phase content are subjected to testing involving lubrication by water-based drilling fluid to determine the friction coefficient of each. The results indicate that an increased load leads to a decreased friction coefficient while the impact of speed is not evident. Under dry conditions, the friction coefficient of three different composites tested, declines with elevated load and speed. With the use of water-based drilling fluid as lubrication, the wear scar diameter increases at higher speed, while dry conditions denote increased load. Abrasive wear is determined to be the principal form of erosion of layered Al2O3/PMMA composites.

Efficacy of Aeschynomene indica L. leaves for wound healing and isolation of active constituent

Ethnopharmacological relevanceIn traditional Chinese medicine, the aerial parts of Aeschynomene indica L. (AIL) have been used for wound healing, and to treat urinary tract infection, hepatitis, enteritis, dysentery, nyctalopia, conjunctivitis, urticaria, and furuncle. However, no scientific investigation has been conducted on its wound healing potential. Aim of the studyTo investigate the effects of AIL extract on wound healing, isolate the active constituent and reveal the possible mechanism of enhancing wound healing. Materials and methodsThe circular excision wound healing model was used to evaluate in vivo wound-healing activity. Hematoxylin and eosin staining was applied to assess inflammatory cells infiltration, angiogenesis, fibroblast proliferation, collagen synthesis, collagen remodeling, and skin appendages generation. Sirius red-picric acid staining was employed for quantitative analysis of the ratio of collagen I/III. Immunohistochemical staining for CD68, CCR7 (CD197), CD163, TGF-β1 and α-SMA was performed to determine macrophages phenotypes transition (M1-to-M2) and prove the scar-improving effect of AIL on wound healing. ResultsWe successfully isolated the active constituent (Sub-Fr0.2) for wound healing from AIL extract, circular excision wound healing experiment and hematoxylin & eosin staining showed Sub-Fr0.2 has a significant promoting effect on wound healing. Results of sirius red-picric acid staining demonstrated a reduced ratio of collagen I/III in the Sub-Fr0.2 group as compared with the vehicle group. Immunohistochemical staining for CD68, CCR7 (CD197), and CD163 in the Sub-Fr0.2 group exhibited an elevated speed of macrophages transiting from M1 phenotype to M2 phenotype, when compared with the vehicle group. Besides, the expression of TGF-β1 and α-SMA were inhibited on wounds treated with the ointment containing Sub-Fr0.2. ConclusionLeaves of AIL and its active constituent (Sub-Fr0.2) effectively promoted wound healing and reduced scar formation, this efficacy might be exerted by accelerating macrophages phenotypes transition and inhibiting TGF-β1 and α-SMA expression.

Integrated Geophysical Investigations at the Greek Kamarina Site (Southern Sicily, Italy)

Kamarina, located in southern Sicily (Italy), was an important Greek colony since its foundation in the sixth century BC. Archaeological excavations, carried out since the twentieth century, uncovered only limited portions of the site so far. Despite the importance of the Greek colony, the presence of remarkable buildings that archaeologists expected to bring to light has not found fully correspondence in the archaeological excavations. Consequently, the integrated geophysical prospection carried out in the study area is aimed to support and address the future archaeological investigations. After the photographic and thermographic survey obtained by an unmanned aerial vehicle, we performed a systematic survey through ground magnetic and GPR methods over an area of 6200 m2. The acquisition procedures have been optimized in order to get the best results combining high resolution and elevated speed of acquisition. The results derived from the three geophysical techniques have been conveniently combined by means of a cluster analysis, allowing us to clearly identify a series of buried archaeological features. Because of their geometrical characteristics, often in good agreement with the spatial arrangement of the archaeological remains at the surface, these buried archaeological features can be interpreted as roads, walls, or buildings foundations in which the various construction phases of the city can be clearly recognized. The integrated approach has proven to be essential for a robust interpretation of the archaeogeophysical investigation.

Lift Control System Based on PLC

In this paper we are scheming and construct three level elevator control system and increase its steady state & stability by using a (PLC) programmable logic controller (Allen Bradley Micrologix-1400 BXBA) the software used for communication is RSLogix-500/5000 PLC’S [1]. These are useful in industrial automation where numbers of equipments are replaced by contactor and switches. In this paper Elevator is nothing but the vertical carrying device which is used to transfer the goods and peoples. Limit switch is used for the floor suggestion. The limit switch is used for positioning of floor. DC motor is used for movement of elevator filing cabinet. Electromagnetic type relay is used in organize circuit to control elevator in upward and downward track. As the India is developing country and there are wide increase in high rise buildings and malls. Elevator is integral part of infrastructure by implementing such paper we can reduce the human efforts, accident due to breakage of rope, efficiency and speed of elevator is improved. Even the time can be consumed by using such system. This paper mainly concentrates on programmable logic controller to control the circuit and building the elevator model. In this paper Three level efficient elevator control system is designed which can be used for different elevator control system having different number of floors.

Effects of PslG on the Surface Movement of Pseudomonas aeruginosa.

PslG attracted a lot of attention recently due to its great potential abilities in inhibiting biofilms of Pseudomonas aeruginosa However, how PslG affects biofilm development still remains largely unexplored. Here, we focused on the surface motility of bacterial cells, which is critical for biofilm development. We studied the effects of PslG on bacterial surface movement in early biofilm development at a single-cell resolution by using a high-throughput bacterial tracking technique. The results showed that compared with no exogenous PslG addition, when PslG was added to the medium, bacterial surface movement was significantly (4 to 5 times) faster and proceeded in a more random way with no clear preferred direction. A further study revealed that the fraction of walking mode increased when PslG was added, which then resulted in an elevated average speed. The differences of motility due to PslG addition led to a clear distinction in patterns of bacterial surface movement and retarded microcolony formation greatly. Our results provide insight into developing new PslG-based biofilm control techniques.IMPORTANCE Biofilms of Pseudomonas aeruginosa are a major cause for hospital-acquired infections. They are notoriously difficult to eradicate and pose serious health hazards to human society. So, finding new ways to control biofilms is urgently needed. Recent work on PslG showed that PslG might be a good candidate for inhibiting/disassembling biofilms of Pseudomonas aeruginosa through Psl-based regulation. However, to fully explore PslG functions in biofilm control, a better understanding of PslG-Psl interactions is needed. Toward this end, we examined the effects of PslG on the surface movement of Pseudomonas aeruginosa in this work. The significance of our work is in greatly enhancing our understanding of the inhibiting mechanism of PslG on biofilms by providing a detailed picture of bacterial surface movement at a single-cell level, which will allow a full understanding of PslG abilities in biofilm control and thus present potential applications in biomedical fields.