Relevant bibliographies by topics / Surface sealing

Academic literature on the topic 'Surface sealing'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 March 2023

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Journal articles on the topic "Surface sealing"

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Wei, Xinlong, Erguang Fu, Aolin Ban, Wy Zhu, Dl Wu, N. Li, and C. Zhang. "Influence of nano-alumina sealing treatment on corrosion resistance of Fe-based amorphous coatings." Anti-Corrosion Methods and Materials 69, no. 3 (March 18, 2022): 253–60. http://dx.doi.org/10.1108/acmm-09-2021-2545.

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Purpose The purpose of this paper is to investigate the effect of nano-alumina sealant sealing treatment on corrosion behavior of the Fe-based amorphous coatings deposited on 304 stainless steel plates by atmospheric plasma spraying (APS) with different hydrogen flow rates. Design/methodology/approach The surface morphology and microstructure of the unsealed and sealed coatings were characterized by scanning electron microscopy and X-ray diffraction. The corrosion resistance of the coatings was investigated by potentiodynamic polarization test and electrochemical impedance spectroscopy experiment in 3.5 Wt.% NaCl solution. Findings Results show that a few microcracks and pores exist in the as-sprayed Fe-based amorphous coatings. The pores on the surface of the coatings after sealing treatment have been filled with nano-alumina sealant, which can effectively prevent corrosive medium from entering into coatings. Electrochemical tests results show that the corrosion resistance of the coatings before sealing treatment decreases with the increase of hydrogen flow rate and is significantly improved by sealing treatment. Originality/value The effect of nano-alumina sealant sealing treatment on corrosion resistance of APS-sprayed Fe-based amorphous coatings is revealed. The corrosion resistance of the as-sprayed Fe-based amorphous coating can be significantly improved by nano-alumina sealant sealing treatment because of the blocking effect of nano-alumina sealant on corrosive medium, which confirms that the application of nano-alumina sealant sealing treatment is of a practical option to improve corrosion resistance of as-sprayed thermal sprayed coatings.
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Muratova, Leysan, Oskar Ismagilov, Elena Statseva, and Aydar Ablyazov. "FISSURE CARIES: DIAGNOSTIC ASPECTS OF CURATION IN THE SCHOOL DENTAL OFFICE." Actual problems in dentistry 15, no. 4 (February 12, 2020): 149–54. http://dx.doi.org/10.18481/2077-7566-2019-15-4-149-154.

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Subject. The problem of fissure caries remains one of the key in modern cariesology. For individual prevention, the most effective is the method of sealing fissures and fossae of the surface of the teeth. By sealing (sealing) fissures, the creation of a physical barrier for cariogenic factors and microbial plaque, remineralization of hard tooth tissues is achieved. The goal is to evaluate the effectiveness of fissure sealing in 9-year-old children living in Kazan. Methodology. The study was conducted using the clinical method and statistical analysis of the data. In total, 137 children aged 9 years old, studying in the third grades of the gymnasium No. 102 of Kazan, took part in it. The main group included 82 schoolchildren who performed non-invasive fissure sealing (the first permanent molars) with UltraSeal XT plus sealant, the comparison group consisted of 55 students who did not have fissure sealing. Results. After 12 months, out of 165 teeth previously coated with sealant, sealant on 95 teeth was completely preserved (57.6 % of cases), sealant fell out or partially retained (tooth is intact) in 36.4 %, fissure caries at the place of sealant was detected in 6.1 % The effectiveness of fissure sealing, which consists in maintaining a healthy masticatory surface of hard tooth tissues, after 12 months of follow-up was 91.9 % with a reduction of caries of 76.7 %. A comparison of the data clearly showed that the condition of the first molars, which was used to seal the fissures, allows us to talk about the preservation of intact fissures in 88 % of cases, while 56 % of unsealed molars are prone to caries of fissures and only 44 % remain intact after a year. Conclusions. A clinical study confirms that sealing fissures is a reliable and reasonable method for the prevention of fissure caries.
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Xu, Honglin, Zhi Zhang, Shilin Xiang, Bin Yang, and Taihe Shi. "Leakage Model of Tubing and Casing Premium Connection Based on Sinusoidal Contact Simulation between Rough Surfaces." Processes 11, no. 2 (February 13, 2023): 570. http://dx.doi.org/10.3390/pr11020570.

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This paper proposed a semi-theoretical model to quantitatively predict leakage rate of tubing and casing premium connections. The geometric parameters of the sealing surface profile approximated by a sinusoidal micro-convex surface were first obtained based on the random normal distribution sampling method. With the actual area prediction formula for elastic–plastic contact of an axisymmetric sinusoidal micro-convex body based on the equivalent simulation principle, the circumferential leakage width and radial average leakage height of the micro-leakage channel between sealing surfaces were then acquired with the surface roughness and geometric mean contact pressure. At last, the actual micro-leakage rate of the premium connection was derived by considering the non-uniform contact pressure distribution between sealing surfaces. An example was investigated to validate the model and reveal the sealing and leakage characteristics, and anti-leakage measures were proposed. The results show that average contact pressure, circumferential leakage width, and radial average leakage height between sealing surfaces were non-uniformly distributed. The leakage rate of a premium connection decreases exponentially with an increase in radial interference between sealing surfaces. In order to reduce leakage rate, it is beneficial to increase radial interference and lower sealing surface roughness.
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Grün, Jeremias, Simon Feldmeth, and Frank Bauer. "The sealing mechanism of radial lip seals: A numerical study of the tangential distortion of the sealing edge." Tribology and Materials 1, no. 1 (2022): 1–10. http://dx.doi.org/10.46793/tribomat.2022.001.

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The sealing behaviour of elastomeric radial lip seals is essentially affected by the sealing mechanism in the contact area between the sealing edge and the shaft surface. The relative motion between radial lip seal and shaft deforms the sealing edge tangentially in the circumferential direction. This mechanical deformation is considered essential for the sealing mechanism. In this study, a numerical approach is employed to simulate this deformation. A three-dimensional multiscale model serves this purpose. The radial lip seal geometry is described on the macro-scale. On the micro-scale, an artificial rough surface with a stochastic roughness distribution is applied to an ideal sealing edge surface. A new meshing algorithm is used to discretise different sealing edge surfaces and automatically generates structured hexahedral meshes of the sealing edges. Mesh transitions connect the resulting finely meshed sealing edge to the coarsely meshed global macro-scale mesh of the radial lip seal. The paper introduces the modelling method used to simulate the deformation of radial lip seals. Results are presented and discussed with reference to the sealing behaviour. This contributes to a better understanding of the sealing mechanism of radial lip seals. Keywords: radial lip seal, finite element analysis, surface roughness, elastic deformation, elastomers.
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Wang, Jian Jun, Jian Hua Sun, Shang Yu Yang, Yao Rong Feng, and Kai Lin. "Tubing String Thread Sealing Surfaces Damage Evaluation Based on Acoustic Elasticity Theory." Materials Science Forum 944 (January 2019): 828–34. http://dx.doi.org/10.4028/www.scientific.net/msf.944.828.

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During the processing of tubing premium threaded made up, the degree of the thread sealing surface intactness will directly affect the sealing performance of the string. Nevertheless, there are some difficulties to detect the damage of the engaged sealing surface effectively. In the present study the sealing surface damage was judged by the sealing surface contact stress’s relative changes according to the acoustic elasticity theory,. At the same time, the wear defects generated at the tubing sealing surface, during the tubing made up, contrasted with the wear and unworn surface roughness of coupling ultrasonic detected about the sealing surface. The results showed that with the acoustic amplitude evaluated the sealing contact stress was susceptible to the influence of surface roughness of coupling. But the reflection wave with the center frequency on the sealing surface characterization of the contact stress could avoid this problem effectively.
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Peng, Yan, Liang Yu Zong, Liu Feng Hao, and Qi Yang Li. "Ball Valve Seat Design Method Based on Finite Element Analysis and Calculation." Applied Mechanics and Materials 551 (May 2014): 331–36. http://dx.doi.org/10.4028/www.scientific.net/amm.551.331.

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The face of the valve seat sealing surface design, the finite element analysis and calculation of ball valve seat sealing surface and angle of the design method is studied. Through 3D CAD technology for ball valve design, guide 3D design model to finite element analysis software to calculate ,reveal the sealing load distribution of pressure in the valve seat sealing surface, sealing pressure values are obtained, through the valve seat sealing surface design Angle analysis, to obtain the optimal value of sealing surface angle.
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Qiu, Ming Xing, Jian Jun Wang, Zhen Xing Wang, and Zhan Ying Li. "Conical Surface Sealing Performance of Pipe Connection Fits." Advanced Materials Research 721 (July 2013): 564–71. http://dx.doi.org/10.4028/www.scientific.net/amr.721.564.

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The conical surface sealing performance of a pipe connection fit (PCF) has been studied by means of an equivalent mechanical model and the contact finite element analysis (FEA). By building an equivalent mechanical model, we studied the basic mechanical relations between the jointing parts, proposed a sealing mechanism, and identified a basic pretension-relaxation-leakage mode occurring in the sealing process of a conical surface PCF. Then we simulated the contact states of the PCF sealing surface using a multi-body elastic contact finite element method (FEM). In addition, the characteristics of the pretension-relaxation-leakage mode were further discussed in terms of the contact forces as well as the contact areas on the sealing surface. These results revealed some fundamental characteristics inherent in the sealing process of conical surface of PCFs, and demonstrated the potentials of the contact FEA in studying PCF sealing performance.
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Fried, Andrew, Haritha Malladi, and Cassie Castorena. "Impact of Crack Sealant on Pavement Skid Resistance." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 7 (June 2, 2019): 362–70. http://dx.doi.org/10.1177/0361198119849590.

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Crack sealing is often a cost-effective preventive maintenance strategy for prolonging pavement service life when applied to pavements in relatively good condition. Crack sealing is generally ineffective for extending the life of heavily cracked pavements. However, crack sealing is often applied to pavements with extensive cracking. The application of crack sealing to pavements with extensive cracking can pose a skid resistance hazard. This study investigates the relationship between the amount and distribution of crack sealant application and pavement skid resistance. Locked-Wheel Skid Tester (LWST) testing was conducted on several pavement projects in North Carolina, United States, with varying amounts and patterns of crack sealant. Images of the locations of LWST testing were obtained and processed to determine the percentage of the pavement surface area covered by crack sealant. A relationship between the percentage of the wheel path covered by crack sealant and LWST results was established that demonstrates the application of high amounts of crack sealant to the wheel path can pose safety hazards. The effect of crack sealant on pavement skid resistance is a function of the existing pavement’s frictional characteristics. The results of this study highlight the need for the development of crack sealant specification provisions to avoid the loss of skid resistance.
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ALLMARAS, R. R. "Soil Surface Sealing and Crusting." Soil Science 158, no. 3 (September 1994): 228–30. http://dx.doi.org/10.1097/00010694-199409000-00011.

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Johnson, David R., Reed B. Freeman, and James R. Stevenson. "Cost-Effectiveness of Crack Sealing Materials and Techniques for Asphalt Pavements." Transportation Research Record: Journal of the Transportation Research Board 1697, no. 1 (January 2000): 31–40. http://dx.doi.org/10.3141/1697-06.

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Sealing or filling cracked asphalt pavements to prevent the intrusion of water into the pavement structure has long been an accepted practice of the Montana Department of Transportation. Attempts were made to establish the most economical and effective method of sealing pavement cracks for Montana and to better determine crack sealing’s role within Montana’s pavement management system (PvMS). Four experimental test sites were constructed within crack-sealing projects. The test sites included combinations of nine sealant materials and six sealing techniques. Monitoring of the test sites includes visual inspections (for all of the sites) and nondestructive structural readings and surface distress identification under Montana’s PvMS (for one test location). One expectation of the inspections is an estimation of crack sealing’s useful life. Information on project history and project methodology, including the methods used for evaluating the performance of sealed cracks, is presented. Interim conclusions are presented, most of which have been obtained from the two test sites that have been in service for 3 years. Similar performance has been observed for all materials with ASTM D5329 cone penetrations in excess of 90. In general, routing of transverse cracks improved the performance of the sealants. Routing did not appear necessary for centerline longitudinal cracks. Observations from the first year of service for the most recent installation are noted. Notably, router operators appear to prefer the shallow reservoir configuration over square reservoirs. The highest failure rates occur during the coldest period of the year, and much of this distress “heals” after exposure to the summer heat.
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Dissertations / Theses on the topic "Surface sealing"

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Raja, Mohan Anandu, and Niranjan Sutar. "Characterization of Sealing Surface for Static Seals." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263915.

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Leakages from seals are one of the important factors that are taken into consideration while designing any machining element. This is because leakages can affect the performance of any component and can also turn into a catastrophe. If looked into it, many parameters can be pointed out that can enhance leakages within the system, some of them may be pressure, temperature, clamping force and bolt distance etc. But the main parameter is the surface roughness, higher the roughness more the leakage and vice-versa. Thus, in this thesis an attempt has been made how the surface roughness can affect the performance of the sealing concept for metal bounded gasket with above four mentioned parameters. Also how leak proof surface can be defined using standard tribological parameters is the aim of this thesis. This report includes the results for methodologies implemented during the thesis and track down the leakages. The leaked surfaces were carefully studied and analyzed using different standards compared with the non leaked surfaces’ roughness parameters.
Läckagerisk från tätande förband är en av de viktigaste faktorerna som beaktas vid utformning av konstruktionsartiklar. Detta på grund av att konsekvenserna kan bli förödande. Det tätande förbandet påverkas av många olika parametrar såsom till exempel tryck, temperatur, klämkraft, skruvavstånd och val av packning. En viktig faktor är ytans beskaffenhet; Generellt läcker en grov yta och vågig yta mer än en fin och plan yta. Således har i denna avhandling ytans beskaffenhet studerats tillsammans med en packning av typen metallburen gummipackning för att påvisa täthetfunktionen som en funktion av tryck, temperatur, klämkraft och skruvavstånd. Denna rapport innehåller resultat och analys av olika standardmetoder för de ytor som ingick i utredningen.
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Geeves, Guy William, and not available. "Aggregate Breakdown and Soil Surface Sealing under Rainfall." The Australian National University, 1997. http://thesis.anu.edu.au./public/adt-ANU20010702.142014.

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Aggregate breakdown is an important process controlling the availability of fine soil material necessary for structural sealing of soil surfaces under rainfall. It may be caused by slaking resulting from rapid soil wetting and by physical dispersion resulting from direct and indirect energetic raindrop impacts. Relationships have been proposed by others predicting steady infiltration rate and saturated hydraulic conductivity from final aggregate size following high energy rainfall on initially dry, uncovered soil surfaces. Under these extreme conditions, both rapid wetting and energetic raindrop impact result in maximum aggregate breakdown and surface sealing. Knowledge of the relative importance of these two agents under less severe conditions and knowledge of how increased aggregate stability due to conservative soil management may ameliorate them should improve prediction and management of aggregate breakdown and surface sealing. ¶ This study has isolated and quantified effects of rapid soil wetting and energetic raindrop impact on aggregate breakdown and surface sealing. Simulated rainfall was applied to re-packed soils from differing tillage treatments on light textured soils from near Cowra and Condobolin in New South Wales, Australia. Aggregate breakdown was assessed using aggregate size distribution, determined by wet sieving and summarised by a range of statistics. The degree of breakdown was assessed after 66 mm of simulated rainfall whilst the rate of change in aggregate size distribution was assessed by sampling after 5, 10, 15, 30 and 60 mm. The degree of surface sealing was assessed using final surface hydraulic conductivity after 66 mm rainfall calculated from inferred infiltration and measured sub-seal soil water potential. The rate of surface sealing was assessed prior to ponding using cumulative rainfall volume at ponding and throughout the post-ponding phase by decline in surface hydraulic conductivity as a function of cumulative rainfall kinetic energy. Two levels of raindrop kinetic energy flux and three wetting treatments were used to isolate effects of these agents of aggregate breakdown and surface sealing. ¶ Significant surface aggregate breakdown was observed when either rapid soil wetting or highly energetic raindrop impact were allowed to occur. The majority of the data suggest a negative interaction between the two agents. When soil was initially dry rapid soil wetting was the dominant agent causing rapid aggregate breakdown, generally within the first 5 mm of rainfall. When rapid soil wetting was prevented by tension pre-wetting, energetic raindrop impact was the dominant agent and was able to cause aggregate breakdown of an almost equivalent degree. This breakdown occurred over a period lasting for up to 30 mm of rainfall. In contrast, the rate and degree of surface sealing were influenced primarily by raindrop kinetic energy with highly energetic impact leading to significant surface sealing, irrespective of soil wetting. For the soils studied, it was concluded that structural sealing of surface soil, could be significantly reduced by protecting the soil surface from energetic raindrop impact but that prevention of surface aggregate breakdown required amelioration of both processes. ¶ In addition to the negative interaction referred to above, a positive interaction was observed whereby energetic raindrop impact occurring concurrently with rapid soil wetting caused a greater degree of aggregate breakdown and a greater degree of surface sealing than energetic raindrop impact occurring subsequent to rapid soil wetting. The effect on surface sealing may be explained by the effect of lower sub-seal water potential that necessarily results from initially dry soil condition required for concurrent rapid wetting. However, the effect on aggregate breakdown remains unexplained. ¶ Notwithstanding the above, permeability was reduced under high kinetic energy rainfall even when soil wetting was reduced to very slow rates by tension pre-wetting. Likewise, surface sealing did occur under low kinetic energy rainfall for the least stable soil following rapid soil wetting. It was concluded that threshold soil wetting rates and threshold rainfall energy levels, proposed by others, are either not applicable to these soils or are negligible. ¶ The rate and degree of aggregate breakdown was also dependent on the soil with the Cowra soil being more stable than the Condobolin soil. Greater aggregate stability brought about by conservative tillage treatments at both soil locations retarded and reduced surface sealing. Unvalidated simulation modelling was used to illustrate possible effects for the soil water balance. In contrast to the conclusions of Loch (1994b), that were based on soils throughout eastern Queensland, the soil water balance simulations predicted that the residual benefits in ameliorating surface sealing resulting from improved aggregate stability could significantly reduce point runoff under the lower intensity winter rainfalls experienced in southern New South Wales. ¶ Limited testing with Condobolin soil following tension pre-wetting showed that rainfall intensity, varying over the range from 16.5 to 66 mm h-1, had little effect on the decline in surface hydraulic conductivity as a function of cumulative rainfall kinetic energy. This contrasts with greater seal permeability under higher rainfall intensities observed by Romkens et al. (1985) and others. It is proposed that an alternative explanation exists for the observations of Romkens et al. based on reduction in seal permeability due to lower sub-seal water potential under lower intensity rainfall. ¶ Post-ponding reduction in K[subscript sat] under high kinetic energy rainfall exhibited exponential decline as a function of cumulative raindrop kinetic energy as proposed by Moore (1981b). However, inferred rates of decline prior to ponding were more rapid than measured post-ponding rates suggesting that infiltration models using only a single exponential rate of surface K[subscript sat] decline based on post-ponding measurements may be in error. Potential for error is greatest at early times for loose soil that is highly susceptible to sealing. ¶ Pre-ponding decline in surface aggregation was also relatively more rapid than post-ponding decline. This discrepancy was evident irrespective of soil pre-wetting. From this it was concluded that the more rapid initial aggregate breakdown and surface sealing was due, at least in part, to processes other than aggregate slaking due to rapid soil wetting. An explanation has been proposed as follows. Raindrops initially fall on aggregates that have not been subjected to rainfall and therefore each drop has the capacity to cause greater aggregate breakdown than subsequent raindrops that fall on aggregates or soil fragments that have been strong enough to survive preceding rainfall impacts. Such a mechanism could provide an alternative explanation of the findings of Baumhardt et al. (1991) who found that less cumulative raindrop kinetic energy was necessary to achieve a given reduction in surface conductance when the cumulative energy was supplied through lower energy drops. ¶ Relationships predicting rates of surface sealing using aggregate breakdown under rainfall and aggregate stability were evaluated. Post-ponding infiltration rate and surface K[subscript sat] were related to aggregate size by exponential functions. The proportion of surface aggregates less than 0.125 mm in diameter provided slightly more consistent relationships. Parameters of fitted relationships differed among wetting pre-treatments suggesting that the influence of sub-seal water potential on surface K[subscript sat] must be considered whenever such relationships are developed or applied. Aggregate stability determined by wet sieving was related to rainfall volume required for ponding, final K[subscript sat] and final aggregate size but only for initially dry soil suggesting that such relationships may be unique to the rainfall, soils and flow conditions used to develop them. ¶ This study has established the relative importance of rapid soil wetting and energetic raindrop impact in both aggregate breakdown and surface sealing over a range of antecedent soil water and rainfall conditions. It has quantified the effectiveness of culturally induced aggregate stability in ameliorating effects of these two important agents and illustrated the potentially significant consequences for the soil water balance. It has quantified temporal patterns of surface sealing and aggregate breakdown and proposed an alternative mechanism explaining more rapid aggregate breakdown during the initial stages of rainfall. It has identified possible explanations for effects of rainfall intensity on surface sealing observed in other studies. It has also partially evaluated a mechanism proposed to explain important effects of subseal water potential on seal permeability found in this and other studies. These significant findings have been used with the findings of other studies to amend the conceptual model proposed by Le Bissonnias (1990). The amended model gives a more complete description of the relationships between parameters and processes determining aggregate breakdown and structural surface sealing under rainfall.
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Hawke, Richard Michael. "The energetics and dynamics of surface sealing, a laboratory investigation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28280.pdf.

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Neumann, Stephan, Georg Jacobs, Achim Feldermann, and Felix Straßburger. "Reducing Friction and Leakage by Means of Microstructured Sealing Surfaces – Example Mechanical Face Seal." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199867.

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By defined structuring of sliding surfaces at dynamic contact seals friction and leakage can be reduced. Compared to macro-structures, micro-structures have the advantage of a quasi-homogeneous influence on the fluid behavior in the sealing gap. The development of suitable microstructures based on prototypes, whose properties are studied on the test bench, is very expensive and time-consuming due to the challenging manufacturing process and measuring technologies, which are necessary to investigate the complex rheological behavior within the sealing gap. A simulation-based development of microstructured sealing surfaces offers a cost- and time-saving alternative. This paper presents a method for simulative design and optimization of microstructured sealing surfaces at the example of a microstructured mechanical face seal.
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Blomlöf, Johan. "Root surface conditioning in periodontal treatment /." Stockholm, 1997. http://diss.kib.ki.se/1997/91-628-2646-8.

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Bonsu, Mensah. "Structural stability and surface sealing as related to organic matter depletion of a shallow organic soil." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26961.

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A physically based model describing the mechanism of surface sealing of soil was evaluated in the context of aggregate stability. The intent of the model study was to better understand the effect of mixing fine-textured mineral subsoil with organic surface soil on structural stability and surface seal formation. The mixing results from tillage and harvesting operations, and management practices such as levelling. The index derived from the model showed that sealing of the shallow organic soil increased with an increase of mineral matter content. The mathematical formulation of the model was based on the principle of conservation of mass and Darcy's law for flow of water through a layered soil column. Assuming convective flow, it was shown theoretically that the rate of surface seal formation is proportional to the flux density of the filtrate, as assumed by Scheidegger (1974). In the model it was further assumed that the pore necks at the soil surface clog first before the seal develops. The assumption that convective flow alone was responsible for the movement of the suspension is likely incorrect for suspensions derived from medium or coarse textured soils, since sedimentation does influence the movement of larger particles. However, introducing a constant sedimentation parameter into the convective flow model did not improve the model. Therefore, it is likely a non-constant sedimentation parameter could improve the model considerably. The model showed that for sufficiently large times the flux density of a filtrate flowing through a soil column at a constant hydraulic head is proportional to inverse square root of time. Testing the model experimentally showed a good agreement between theory and experiment. A highly significant correlation between the soil stability factor derived from the model and aggregate stability suggests that the index is a soil structural attribute. The soil stability factor was exponentially related with aggregate stability and mineral matter content. However, whereas the relationship between the soil stability factor and aggregate stability gave a positive exponent, a negative exponent was obtained with mineral matter content. Further studies showed that structural stability and saturated hydraulic conductivity of the aggregate beds were positively and significantly correlated exponentially. However, saturated hydraulic conductivity and mineral matter content were negatively and significantly correlated exponentially. Collateral to the results of the model, the strong negative correlation between wet-sieved aggregate stability and mineral matter content confirmed the deleterious effect of mixing fine-textured mineral soil on the structure of the shallow organic soil. It was theorized that aggregates stabilized through clay-organic complexing are likely to be much stronger than aggregates stabilized through other mechanisms. This implies that whenever the mineral matter content is much higher than the organic matter content, the surplus mineral matter that does not interact with organic matter will be most dispersible. The high silt content of the mineral matter fraction is likely to be an important factor contributing to the decrease in structural stability with increasing mineral matter content. Once the clay and the organic colloids have interacted, the silt that remains is not capable of forming stable aggregates without colloids (Baver et al. 1972). From measurements of the air to water permeability ratio, the decrease in saturated hydraulic conductivity of the aggregate beds with increasing mineral matter content was attributed to slaking of the mineral matter fraction. However, it is possible for the soil with high mineral matter content to be stable if the mineral matter is allowed to be in contact with the organic matter for a long period of time.
Land and Food Systems, Faculty of
Graduate
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Jones, Gordon A. "Tribology of the mechanical sealing interface : an evaluation of the role and potential of surface engineering." Thesis, University of Salford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300829.

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Jones, Trevor. "Fracture Sealing by Mineral Precipitation| The Role of Surface Heterogeneities on Precipitation-Induced Transport Property Alterations." Thesis, University of California, Irvine, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13424490.

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Fractures are often leakage pathways for fluids through low-permeability rocks that otherwise act as geologic barriers to flow. Flow of fluids that are in chemical disequilibrium with the host rock can lead to mineral precipitation, which reduces fracture permeability. When fracture surfaces contain a single mineral phase, mineral precipitation leads to fast permeability reduction and fracture sealing. However, the feedback between precipitation and permeability may be disrupted by mineral heterogeneities that localize precipitation reactions and provide paths of low-reactivity for fluids to persist over relatively long time-scales. In this dissertation, I explore the role of mineral heterogeneity on precipitation-induced permeability reduction in fractures. To do this, I use a combined experimental and numerical approach to test three hypotheses: (1) Mineral heterogeneity prolongs fracture sealing by focusing flow into paths with limited reactive surface area, (2) Precipitation-induced transport alterations at the fracture-scale are controlled by three-dimensional growth dynamics at the grain-scale, and (3) The effects of mineral heterogeneity become more pronounced as mineralogy and surface roughness become autocorrelated over similar length-scales.

Direct measurements of mineral precipitation using transmitted light methods in a transparent analog fracture show that mineral heterogeneity can lead to the progressive focusing of flow into paths with limited reactive surface area, which is in support of (1). In this experiment, flow focusing led to a 72% reduction in the max precipitation rate; measurements of the projected mineralogy show that this was due to focusing of large dissolved ion concentrations into regions that contained 82% less reactive surface area than the fracture-scale average. Results from a newly developed reactive transport model that simulates precipitation-induced fracture surface alterations as a three-dimensional process are in good qualitative agreement with these experimental observations. Comparison of these results with a reactive transport model that represents precipitation as a 1D alteration of the fracture surfaces show that this flow-focusing process is driven by lateral growth of reactive minerals across the fracture-plane, which supports (2). Lastly, results from simulations in fractures that contain varied degrees of heterogeneity show that precipitation leads to a competition between two feedbacks: (i) precipitation-induced reactive surface area enhancement, which increases precipitation rates, and (ii) precipitation-induced permeability reduction, which decreases precipitation rates. When surface roughness and mineral heterogeneity provide persistent paths of limited surface area, the reactive transport becomes very sensitive to local permeability reduction. Simulation results show that this prolongs the fracture-sealing process and can lead to a reduction in fracture-scale precipitation rate, which supports (3). Furthermore, the results presented in this dissertation demonstrate that predictions of fracture sealing by mineral precipitation can be easily misinformed by studies that ignore small-scale mineral heterogeneity and neglect the three-dimensional nature of precipitation-induced fracture surface alterations.

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OLIVEIRA, FELIPE de. "Estudo de camadas finas tratadas por laser em anéis de pistão." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10048.

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Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Tafoya, Keirsten Breann. "Process Improvement of Surface Preparation of Structuraly Bonded Helicopter Detail Parts." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404599/.

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The objective of this study was to increase the bond strength at the surface interface of a thin stainless-steel panel for structural bonding on a helicopter. To achieve this objective, six activation methods for applying the coating to the panel in the surface preparation process are presented and explored. Adhesion and roughness tests were conducted to determine which method consistently initiates the etch and improves the bond at the surface. Based on the test results, three methods proved to be effective in initiating the etch. Of the three effective methods, only one method exhibited significantly improved bond strength at the surface interface as well as consistently initiated the etch in solution. The applicability of this method is discussed, and recommendations are presented for further study.
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Books on the topic "Surface sealing"

1

1958-, Rizzo Mario, and Bruno Giuseppe 1959-, eds. Surface coatings. Hauppauge, NY: Nova Science Publishers, 2009.

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Prepaint specialties and surface tolerant coatings. Park Ridge, N.J., U.S.A: Noyes Publications, 1991.

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Hendricks, Robert C. Brush seal low surface speed hard-rub characteristics. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Adhesives, Sealants and Encapsulants Conference. (3rd 1988 Metropole Exhibition Centre.). ASE 88: The Third Adhesives, Surface Coatings & Encapsulants Exhibition & Conference : Conference proceedings : Metropole Exhibition Centre, Brighton, UK, 4,5,6, October 1988. Buckingham: Network Exhibitions & Conferences, 1988.

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A, Poesen J. W., Nearing M. A, and International Society of Soil Science., eds. Soil surface sealing and crusting: Selected papers of the International Symposium on Soil Crusting: Chemical and Physical Processes, May 30-June 1, 1991, Athens, Georgia, USA. Destedt: Catena Verlag, 1993.

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Mazzoni, Stefania, and Franca Pecchioli, eds. The Uşaklı Höyük Survey Project (2008-2012). Florence: Firenze University Press, 2016. http://dx.doi.org/10.36253/978-88-6655-902-3.

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This book presents the results of the survey conducted by the University of Florence, in the years 2008-2012, at the site and in the surrounding territory of Uşaklı Höyük on the central Anatolian plateau in Turkey. Geological, geomorphological, topographic and geophysical research have provided new information and data relating to the environment and the settlement landscape, as well as producing new maps of the area and indicating the presence of large buried buildings on the site. Analysis of the rich corpus of pottery collected from the surface indicates that the site and its territory were continuously settled from the late Early Bronze Age through the Iron Age and down to the Late Roman and Byzantine periods. A few fragments of cuneiform tablets with Hittite texts, a sealing with two impressions of a stamp seal, and pottery stamps illustrate the importance of Uşaklı Höyük and support the hypothesis of its identification with the town of Zippalanda, known from the Hittite sources as a seat of the cult of the Storm God.
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Joining of materials and structures: From pragmatic process to enabling technology. Amsterdam: Elsevier, 2004.

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D, Kaplan Wayne, ed. Joining processes: An introduction. Chichester: Wiley, 1997.

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United States. Congress. House. Committee on Armed Services. Subcommittee on Air and Land Forces, ed. U.S. Transportation Command's (USTRANSCOM) airlift, sealift, and surface lift programs: Joint hearing before the Seapower and Expeditionary Forces Subcommittee meeting jointly with Air and Land Forces Subcommittee of the Committee on Armed Services, House of Representatives, One Hundred Eleventh Congress, first session, hearing held, February 25, 2009. Washington: U.S. G.P.O., 2010.

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Poesen. Soil Surface Sealing and Crusting (Catena Supplement 24). Catena-Verlag, 1993.

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Book chapters on the topic "Surface sealing"

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De Volder, Michael. "Capillary Based Sealing." In Surface Tension in Microsystems, 211–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37552-1_11.

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Komiya, Makoto, Shingo Matsui, and Hiroshi Hirabayashi. "Investigation on Surface Failure of Hard Materials for Mechanical Seals." In Fluid Sealing, 495–506. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2412-6_31.

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Assouline, Shmuel. "Soil Surface Sealing and Crusting." In Encyclopedia of Agrophysics, 786–91. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-3585-1_156.

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Yates, John T. "Temporary Leak Sealing of Welded Bellows." In Experimental Innovations in Surface Science, 164–65. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-2304-7_53.

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Ruiz, Pilar González, Kristin De Meyer, and Ann Witvrouw. "Sealing of Surface Micromachined Poly-SiGe Cavities." In Poly-SiGe for MEMS-above-CMOS Sensors, 101–26. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6799-7_5.

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Tanaka, K., Y. Tokunaga, S. Uemoto, T. Morimoto, A. Tanaka, Y. Yamaoka, and K. Ozawa. "Fibrin Sealing of the Cut Surface of Liver Grafts in Partial Liver Transplantation with Living Related Donors." In Fibrin Sealing in Surgical and Nonsurgical Fields, 11–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85101-8_2.

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Valayer, J., F. Gauthier, T. Yandza, O. DeDreuzy, and A. Lababidi. "Fibrin Sealing for Hemostasis of the Cut Surface in Reduced-Size Grafts During Orthotopic Liver Transplantation in Children." In Fibrin Sealing in Surgical and Nonsurgical Fields, 180–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85101-8_23.

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Rettenberger, G., and S. Urban. "Concept for Surface Sealing at the Special Waste Depot of Gerolsheim." In Contaminated Soil ’88, 639–41. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2807-7_103.

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Feng, Xiu, and Bo Qin Gu. "Fractal Characterization of Sealing Surface Topography and Leakage Model of Metallic Gaskets." In Key Engineering Materials, 2977–80. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.2977.

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Gabriels, D., R. Horn, M. M. Villagra, and R. Hartmann. "Assessment, Prevention, and Rehabilitation of Soil Structure Caused by Soil Surface Sealing, Crusting, and Compaction." In Methods for Assessment of Soil Degradation, 129–65. Boca Raton: CRC Press, 2020. http://dx.doi.org/10.1201/9781003068716-7.

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Conference papers on the topic "Surface sealing"

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Morana, B., G. Pandraud, F. Santagata, J. F. Creemer, and P. M. Sarro. "Stiction-driven sealing of surface micromachined channels." In 2012 IEEE 25th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2012. http://dx.doi.org/10.1109/memsys.2012.6170202.

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Liu, Shun, Sun Jin, Xueping Zhang, Lixin Wang, Benfu Mei, and Bin Hu. "Controlling Topography of Machined Surface for Adhesive-Sealing." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2674.

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Adhesive is widely used in engine, airplane and other industry parts to bond and seal machined joint surfaces. Adhesive performance is important and mechanically complex, closely related to the adhesive material property, bonding process and topography of machined surfaces. The effects of material properties, bonding process, and the geometry and dimensions of adhesive layer on adhesive performance have been well studied in adhesive research field. However, the effect of the topography of machined surface on sealing performance was somehow neglected in literature. On the other hand, the texture of machined surface, especially at micro-level of surface roughness, usually used as the objective to determine process parameters in machining and also regarded as indicators of machining productivity, has been systemically and sufficiently studied. However sealing performance has not been widely investigated to relate to topography of machined surface generated from machining operation. Actually, the surface topography plays an important role in the both fields as an index for machining process and also a factor for functional performance. Desired surface should be determined firstly and then machining parameters are designed properly to achieve the desired surface, in order to improve the functional behavior such as the applied adhesive sealing performance of machined components. This research has objectives: 1) the desired surface topography is determined based on the relationship between machining operation and surface texture; 2) The effects of machined surface topography on the reliability of adhesive joint surfaces are analytically investigated. Thus, the research provides a systematic thinking for the selection of surface topography and parameters of face milling operation to improve the performance of adhesive bonding and sealing for its industry implementation.
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Reinhardt, Stefan, Jan-Peter Reibert, and W. Haas. "Liquid Sealing Materials: Sealing Gap of Liquid Gaskets." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61512.

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The design of fluid sealed surface areas is a challenge for any engineer, due to mechanical, thermal and chemical influences. In the field of drive technology a further challenge is the transmission of torques onto the sealing area. Designers have to consider all these influences when making the pertinent layout. If sealing fluids are used as sealing agents, the designer has to decide whether to design the sealing area as a mere force-locked connection or as a combination of force-locked and adhesive bonded. When connections which are force-locked and join adhesive bond are chosen connections conditions and details at the sealing gap have to be known. Due to new measuring techniques and the visualization of the measuring results, it is possible to obtain all the necessary details of the surface sealing area.
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Richardson, Alan, Kathryn Coventry, and Jack Pasley. "Bacterial Crack Sealing and Surface Finish Application to Concrete." In Fourth International Conference on Sustainable Construction Materials and Technologies. Coventry University, 2016. http://dx.doi.org/10.18552/2016/scmt4m100.

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Zhang, Xiaobing, and Haijiang Liu. "Image guided as-assembled car engine sealing surface modeling." In 2017 2nd International Conference on Robotics and Automation Engineering (ICRAE). IEEE, 2017. http://dx.doi.org/10.1109/icrae.2017.8291402.

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Nagata, Atsushi, Shinji Ushijima, Shingo Mukai, and Eizo Hayashi. "Explication of Gasket for Sealing of Super Rough Surface." In SAE 2012 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2012. http://dx.doi.org/10.4271/2012-01-0958.

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Okamura, Tatsuo, Masaya Ohtsuka, Naohito Suetsugu, Takashi Ohta, Shigeyuki Ono, and Kenya Nakamura. "Micro Surface Roughness of O-rings and Sealing Mechanism." In SAE 2002 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-0662.

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Jasim, K. Mohammed, D. R. F. West, W. M. Steent, and R. D. Rawlings. "Laser surface sealing of plasma sprayed yttria stabilized zirconia ceramics." In ICALEO® ‘88: Proceedings of the Laser Materials Processing Conference. Laser Institute of America, 1988. http://dx.doi.org/10.2351/1.5058007.

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Foster, Jeff A. "Sealing Rougher Surface Finishes Using Conformable Rubber Coating on MLS." In SAE 2001 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-0687.

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Chemakin, A. V., I. G. Neizvestny, Natalia L. Shwartz, Zoja S. Yanovitskaya, and Alexej V. Zverev. "Pore sealing during epitaxy and annealing on Si(001) surface." In SPIE Proceedings, edited by Zhores I. Alferov and Leo Esaki. SPIE, 2002. http://dx.doi.org/10.1117/12.510519.

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Reports on the topic "Surface sealing"

1

Doyle, Jesse D., Nolan R. Hoffman, and M. Kelvin Taylor. Aircraft Arrestor System Panel Joint Improvement. U.S. Army Engineer Research and Development Center, August 2021. http://dx.doi.org/10.21079/11681/41342.

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Aircraft Arresting Systems (AAS) for military applications utilize sacrificial panels made of Ultra-High Molecular Weight polyethylene (UHMWPE) that are embedded into the pavement beneath the AAS cable to protect the pavement from cable damage. Problems have been observed with the materials and practices used to seal the UHMWPE panel joints from water and debris. Data obtained from laboratory and field studies were used make improvements to current practice for sealing UHMWPE panel joints. The study evaluated four joint-sealant materials, eight alternative surface treatment and preparation techniques to promote adhesion to UHMWPE, and seven joint-edge geometries. Bond-strength testing of joint-sealant specimens was conducted in the laboratory, followed by field evaluation of construction techniques. Field performance of the joint systems was monitored for 24 months after installation. Additionally, a thermal response model was developed to refine the joint design dimensions. Results confirmed that the best material to use was self-leveling silicone joint sealant. It was recommended that a dovetail groove be cut into the edge of UHMW panels to provide positive mechanical interlock and to reduce adhesive failures of the sealant. It was also recommended that the panel-to-panel joint-sealant reservoir be widened to prevent sealant compression damage.
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Cheng, DingXin, Gary Hicks, and Roger D. Smith. Manual for Asphalt Pavement Repair and Resurfacing Preparation. Mineta Transportation Institute, July 2022. http://dx.doi.org/10.31979/mti.2022.2103.

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Timely repairs of pavement defects are essential in protecting an important investment and asset that public agencies have. These repairs may be made as durable “stand-alone” repairs of isolated problems, or as part of preparations for a total resurfacing. This manual provides basic information on the planning, materials and construction aspects of common pavement repairs such as crack sealing, crack filling, and patching, as well as a broader look at other preparations needed for total resurfacing a pavement, whether the resurfacing is a surface treatment or a thin hot mix asphalt (HMA) overlay.
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Graves, C. E. Testing of isolation barrier sealing surfaces. Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/10116041.

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Eutizzi, Nick F. Model Testing of an Oval Shaped Seal for Sealing of Large Gaps Between Mating Surfaces (The National Shipbuilding Research Program). Fort Belvoir, VA: Defense Technical Information Center, August 1988. http://dx.doi.org/10.21236/ada454144.

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CAE Correlation of Sealing Pressure of a Press-in-Place Gasket. SAE Imposter, April 2021. http://dx.doi.org/10.4271/2021-01-0299.

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The Press-in-Place (PIP) gasket is a static face seal with self-retaining feature, which is used for the mating surfaces of engine components to maintain the reliability of the closed system under various operating conditions. Its design allows it to provide enough contact pressure to seal the internal fluid as well as prevent mechanical failures. Insufficient sealing pressure will lead to fluid leakage, consequently resulting in engine failures. A test fixture was designed to simulate the clamp load and internal pressure condition on a gasket bolted joint. A Sensor pad using TEKSCAN equipment was used to capture the overall and local pressure distribution of the PIP gasket under various engine loading conditions. Then, the Sensor pad test results were compared with simulated CAE results from computer models. Through the comparisons, it is found that the gasket sealing pressure of test data and CAE data show good correlation for bolt load condition 500N when compared to internal pressure side load condition of 0.138 MPa & 0.276 MPa. Moreover, the gasket cross-sectional pressure distribution obtained by experimental tests and CAE models correlated very well with R2 ranging from 90 to 99% for all load cases. Both CAE and Sensor pad test results shows increase in sealing pressure when internal side pressure is applied to the gasket seal.
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