Journal articles on the topic 'Sealing'
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Xu, Lin, Xiaohe Huang, Xin Huang, Jie Xu, Xijin Xing, Mingbiao Xu, Chao Ma, and Meilan Huang. "Systematic Experimental Investigation on In-Situ Self-Adaptive Sealing Property of Composite Pressure-Activated Sealant for Curing Minor Tubular Leaks." Energies 13, no. 21 (October 26, 2020): 5597. http://dx.doi.org/10.3390/en13215597.
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Curing minor leaks and restoring the integrity of a wellbore in a safe and economical way is always challenging in oil and gas production. In this work, a composite pressure-activated sealant, combined with liquid and solid sealing materials, was prepared via the demulsification approach. The structure, morphology, and size distribution of key particulates in the sealant were examined, and the in-situ self-adaptive sealing property was examined with a specially design dynamic sealing detector. The results indicated that the pressure-activated sealant was a multi-dispersed phase system, and the dispersed colloid particles were regular in shape and had a narrow size distribution of 300–400 μm. The solid sealing materials were introduced to construct a composite pressure-activated sealant, and the sealing capability can be markedly reinforced by cooperativity of liquid and solid sealing materials. A mechanochemical coupling model was put forward to rationalize the dynamic sealing process. Finally, such sealant system was employed in a certain offshore gas well with sustained casing pressure to verify its applicability in minor defect repairs.
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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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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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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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Yildirim, Yetkin. "Field performance comparison of asphalt crack-filling materials: hot pour versus cold pour." Canadian Journal of Civil Engineering 34, no. 4 (April 1, 2007): 505–12. http://dx.doi.org/10.1139/l06-143.
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One of the most important components of pavement maintenance has been the sealing of cracks. The most commonly used materials for crack sealing are hot-pour sealants, such as hot rubber asphalt. However, this material can be hazardous at high operating temperatures and is more likely to be picked up by vehicle tires if the sealant is not sufficiently adhered to the pavement. Thus, cold-pour sealants have been considered as an alternative for crack sealing purposes. This study aims to compare the performance of hot-pour rubber asphalt crack sealant and cold-pour asphalt emulsion crack sealant in five different Texas districts that experience different weather conditions. The comparison includes seven different crack sealants: three cold pour and four hot pour. Five different roads in five districts were selected for comparison of the sealants. The field study results indicate that hot-pour sealants performed better than cold-pour sealants.Key words: sealants, emulsified crack sealants, crack sealing, asphalt pavements.
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Jivoinovici, Radita, Ileana Suciu, Irina Gheorghiu, and Ioana Suciu. "A configuration of lateral and accessory channels from interradicular furcation in upper molars – assumptions regarding their sealing process." Romanian Journal of Stomatology 62, no. 1 (March 31, 2016): 23–27. http://dx.doi.org/10.37897/rjs.2016.1.5.
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The difficulty issuing assumptions sealing lateral canals is closely linked to the unpredictability constituting where the elements are placed in the lateral canal content (connective tissue, necrotic tissue, microbial germs, which can interfere with the sealant, influencing the quality of sealing). It is known that these lateral channels can not benefit from debridement and instrumentation, implying persistent organic content, which interferes with the sealing. The aim of this study is to highlight the lateral canals and accessory furcation on extracted teeth using dye impregnation methodology that is commonly used to identify internal anatomical configuration of the endodontic space. The study also aims to identify the pattern of lateral canals in addition to the establishment of theoretical models about the thereof process of sealing. Thus, imagines sealant flow patterns through lateral channels by applying Bernoulli’s principle and Darcy’s law.
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Oleksiienko, Olena, and Lena Vergun. "The influence of the conditions of applying sealing polymer materials on the deformation resistance of the sealanter to sclofibro concrete." Building constructions. Theory and Practice, no. 14 (June 28, 2024): 79–88. http://dx.doi.org/10.32347/2522-4182.14.2024.79-88.
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The article deals with the features of the treatment of solid surfaces with a primer before using sealing materials. The adhesive strength of the sealant to the area of adhesion is the basis for sealing the joints. Lack of adhesion leads to the ingress of water, dirt, precipitation and other climatic effects, which eventually lead to the destruction of the seams. Therefore, it is extremely important to observe the seam treatment technology before applying the sealant. Proper treatment of seams with a primer, observing the time of application to the base, before using sealing materials will increase the durability and service lifespan of the sealed joint. To improve the adhesive strength between the adhesive and the substrate, as a rule, the hard surface (substrate) is pre-treated with a primer based on polyurethane foam or epoxy resins. These primers are used because when exposed to a hard surface, a polymer matrix is formed, which, upon further contact with the sealant, increases the adhesion strength in the contact zone. In surface defect zones with moisture content, a new surface layer is also formed due to the participation of polymer groups in forming intramolecular hydrogen bonds. The formation of a polymer layer on a solid surface containing defective zones requires a certain time. Tests were carried out to determine the resistance to deformations of a combination of sealant/primer sealing materials in combination with glass fiber reinforced concrete samples and to establish the influence of the conditions for applying a primer/sealant to the surface of a glass fiber reinforced concrete composition on resistance to a series of character cycles of equal loads and temperature changes, with a deformation of the sealing material of 25% . It has been established that the time of treatment of a solid surface with a primer should be at least 5 minutes. If this condition is not observed when sealing materials are applied to glass fiber reinforced concrete, it may cause the sealant to separate from the base.
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Massa, Michele, and Yusuf Tuna. "Reassessing western and central Anatolian Early Bronze Age sealing practices: a case from Boz Höyük (Afyon)." Anatolian Studies 69 (2019): 59–75. http://dx.doi.org/10.1017/s0066154619000048.
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AbstractThis paper presents a detailed investigation of an Early Bronze Age clay sealing from Boz Höyük, a settlement mound located along the Büyük Menderes valley (inland western Anatolia). The artefact, clearly local in manufacture, was employed as a stopper to seal a bottle/flask and impressed with two different stamp seals. These elements are compared to all other published contemporary sealings in western and central Anatolia, in order to understand the degree of complexity of sealing practices in the region. In turn, evidence of Early Bronze Age Anatolian sealing practices is discussed in relation to the available evidence regarding the degree of social complexity in local communities. It is suggested that, during the Early Bronze Age, sealings were employed for product branding rather than control over storage and redistribution of commodities, and only at the beginning of the second millennium BC did the region witness the introduction of complex administrative practices.
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Francescut, P., and A. Lussi. "Performance of a Conventional Sealant and a Flowable Composite on Minimally Invasive Prepared Fissures." Operative Dentistry 31, no. 5 (September 1, 2006): 543–50. http://dx.doi.org/10.2341/05-91.
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Clinical Relevance Preparation prior to fissure sealing did not enhance the performance of the sealant. However, if caries is suspected and an enameloplasty has to be performed, opening the fissure with a diamond bur and sealing it with a conventional sealer is recommended.
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Hegger, Christian, and Jürgen Maas. "Smart sealing for magnetorheological fluid actuators." Journal of Intelligent Material Systems and Structures 30, no. 5 (February 12, 2018): 689–700. http://dx.doi.org/10.1177/1045389x17754261.
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In automotive and industrial environments, magnetorheological fluid–based applications such as clutches and brakes are gaining continuously more attention. However, one of the serious challenges for their application are drag losses at high shear rates. While viscous losses of the magnetorheological fluid can be eliminated by a magnetorheological fluid movement control based on partially filled shear gaps, commonly utilized sealings also cause drag losses based on dry friction. To overcome these challenges, in this contribution, a novel design of sealings for magnetorheological fluid–based actuators is introduced eliminating the adverse drag losses. The intended sealing is based on the magnetorheological fluid itself, positioned in a sealing gap and exposed to a well-defined magnetic stray field of a permanent magnet to prevent any leakage. To eliminate drag torques, a superimposed functional principle with the magnetorheological fluid movement control is utilized. An analytical and a simulation-based modeling approach is proposed describing the torque behavior of the magnetorheological fluid sealing. In experimental investigations, the drag torque-free operation is proven by showing a lossless operation above a defined rotational speed.
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Ponniah, Joseph E., and Gerhard J. Kennepohl. "Crack Sealing in Flexible Pavements: A Life-Cycle Cost Analysis." Transportation Research Record: Journal of the Transportation Research Board 1529, no. 1 (January 1996): 86–94. http://dx.doi.org/10.1177/0361198196152900111.
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Pavement cracks are usually sealed to prevent water from entering base course layers. Experience suggests that water in pavement layers hastens pavement deterioration and, therefore, increases rehabilitation costs. Initially the Ministry of Transportation, Ontario (MTO), Canada, had limited success in sealing cracks because inappropriate materials and installation procedures were used. This setback during the initial stages of development in crack sealing raised questions about the effectiveness of crack sealing in reducing the rate of pavement deterioration. In the 1970s and 1980s MTO carried out several field studies to develop an effective crack sealing procedure and to study the influence of crack sealing on pavement distress and performance. The cost-effectiveness of this treatment was investigated as well. The results of the studies indicate that sealing cracks is a viable and cost-effective preventive maintenance treatment and can extend the service life of asphalt pavements by at least 2 years. However, for optimum benefits the crack sealing program must be implemented according to guidelines proposed. The guidelines provide a basis for the selection of suitable pavements and cracks, sealant materials, and application procedures.
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Kim, Soyoung, Karam Han, Seonhoon Kim, Linganna Kadathala, Jinhyeok Kim, and Juhyeon Choi. "Strengthening Thermal Stability in V2O5-ZnO-BaO-B2O3-M(PO3)n Glass System (M = Al, Mg) for Laser Sealing Applications." Applied Sciences 11, no. 10 (May 18, 2021): 4603. http://dx.doi.org/10.3390/app11104603.
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Today, the most common way of laser sealing is using a glass frit paste and screen printer. Laser sealing using glass frit paste has some problems, such as pores, nonuniform height, imperfect hermetic sealing, etc. In order to overcome these problems, sealing using fiber types of sealant is attractive for packaging devices. In this work, (70-x)V2O5-5ZnO-22BaO-3B2O3-xM(PO3)n glasses (mol%) incorporated with xM(PO3)n concentration (where M = Mg, Al, n = 2, 3, respectively) were fabricated and their thermal, thermomechanical, and structural properties were investigated. Most importantly, for this type of sealing, the glass should have a thermal stability (ΔT) of ≥80 °C and the coefficient of thermal expansion (CTE) between the glass and panel should be 1.0 ppm/°C. The highest thermal stability ΔT of the order of 93.2 °C and 112.9 °C was obtained for the 15 mol% of Mg(PO3)2 and Al(PO3)3 doped glasses, respectively. This reveals that the bond strength and connectivity is more strongly improved by trivalent Al(PO3)3. The CTE of a (70-x)V2O5-5ZnO-22BaO-3B2O3-xAl(PO3)3 glass system (mol%) (where x = 5–15, mol%) is in the range of 9.5–15.5 (×10−6/K), which is comparable with the CTE (9–10 (×10−6/K)) of commercial DSSC glass panels. Based on the results, the studied glass systems are considered to be suitable for laser sealing using fiber types of sealant.
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Cornea, Daniela, Radu Oprean, and Diana Dudea. "THE USE OF DENTAL SEALING IN CLUJ, ROMANIA: FREQUENCY, MATERIALS AND TECHNIQUES - A QUESTIONNAIRE STUDY." Medicine and Pharmacy Reports 87, no. 3 (August 5, 2014): 182–85. http://dx.doi.org/10.15386/cjmed-280.
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Aims. Dental decay is a condition, that involve both temporary and permanent dentitions. Prophylactic methods for dental decays consists of: dental sealing, use of fluorides, oral hygiene and healthy diet habits. This article focuses on the frequency, dental materials and techniques used for caries prophylaxis by using dental sealing in Cluj County.Materials and methods. The study used a set of questionnaires that was applied to 175 doctors from Cluj. The questionnaire contained 11 questions and it was delivered to the doctors personally or by the internet.Results. From the interviewed dentists 85.7 % use dental sealing and 86.7% use materials based on composite resins in this respect. For diagnostic purposes,76% of the dentists use inspection and palpation, 68.66% use cotton rolls and aspiration for isolation, 74% use professional brushing, 74% call back the patient after 6 months for a check-up and 60 % of the doctors redo the sealing if the sealant is partially or entirely lost or they perform a filling if a secondary decay appeared.Conclusions. Most of the interviewed dentists perform dental sealing and consider it as a good caries prophylaxis method. Also, most of them use a material based on composite resins as pit and fissure sealant. The techniques for this procedure are different among the interviewed dentists.
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Wang, Jintao, Shengxi Wang, Bo Wang, Xiaohui Han, Yong Liu, Jiehe Ye, and Zhan Cheng. "Study on Corrosion Resistance of Stainless-Steel Welded Joints with SnSb8Cu4 and SnZn9." Materials 16, no. 11 (May 23, 2023): 3908. http://dx.doi.org/10.3390/ma16113908.
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The use of soldering based on metallurgical bonding, as opposed to conventional rubber sealing, is capable of achieving the firm sealing of stainless-steel subway car bodies, though the corrosion resistance of such joints has rarely been investigated. In this study, two typical solders were selected and applied to the soldering of stainless steel, and their properties were investigated. As indicated by the experimental results, the two types of solder exhibited favorable wetting and spreading properties on stainless-steel plates, and successfully achieved sealing connections between the stainless-steel sheets. In comparison with the Sn-Zn9 solder, the Sn-Sb8-Cu4 solder exhibited lower solidus–liquidus, such that it can be more suitably applied to low-temperature sealing brazing. The sealing strength of the two solders reached over 35 MPa, notably higher than that of the sealant currently used (the sealing strength is lower than 10 MPa). In comparison with the Sn-Sb8-Cu4 solder, the Sn-Zn9 solder exhibited a higher corrosion tendency and a higher degree of corrosion during the corrosion process.
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Shaymieva, N. I., R. Sh Khasanov, and V. N. Olesova. "Clinical and economic analysis of dental caries prevention using fluorine-containing sealants." Kazan medical journal 102, no. 4 (August 8, 2021): 545–50. http://dx.doi.org/10.17816/kmj2021-545.
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Aim. To conduct a clinical and economic analysis of the effectiveness of the program fissure sealing of first permanent molars with fluorine-containing sealants among schoolchildren of 78 years old in six cities of the Republic of Tatarstan.
Methods. Between 2007 and 2011, dentists of six cities of the Republic of Tatarstan performed fissure sealing of permanent first molars using a fluorine-containing sealant in 24,394 schoolchildren aged 78 years according to the manufacturer's instruction. A clinical assessment of fluorine-containing sealant retention during tooth eruption was carried out annually, the results were submitted to the organizational and methodological office of the Republican Dental Clinic. The analysis of the complex of signs that have a normal distribution and characterize four degrees of sealant retention on the occlusal surfaces of teeth in children from several cities was carried out by using one-way ANOVA (analysis of variance) with the calculation of a p-value and F-test (according to Ronald Fischer). Statistical data processing was performed using the Microsoft Office Excel 2017 software. The economic analysis was performed by using mathematical modelling.
Results. The use of sealants at the age of 78 years ensured the complete safety of the sealant in 80% of children; the development of dental caries in 1.7%; complete and partial loss 14.3%; disturbance of fit without the development of caries in 4.1% of cases [р=0.0095 (0.01); f-test 3.09839]. Clinical and economic analysis using a mathematical hypothesis in sealing with a fluorine-containing composite sealant determined the preservation of the conditionally spent funds for the treatment of 80% of healthy teeth for 4 years of the project in the amount of 6,001,177 rubles. Notional saved costs for the treatment of one tooth with a sealant amounted to 23.7 rubles.
Conclusion. Implementation of the program fissure sealing of first permanent molars with fluorine-containing sealants among schoolchildren of 78 years old allows a total of 98.3% of healthy teeth to be preserved and notionally saved costs of sealing fissures to be reduced.
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Ruslan Isayev, Aysham Kazimli, Ruslan Isayev, Aysham Kazimli, and Javid Mustafayev Javid Mustafayev. "RESEARCH OF SEALING KNOT OF WELLHEAD." ETM - Equipment, Technologies, Materials 20, no. 02 (April 28, 2024): 183–90. http://dx.doi.org/10.36962/etm20022024-183.
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The article covers data on the investigation of line heads, their assortments, and the fixing component used to suspend the security pipes during the wellhead supply subsequent to boring is done, as well as bringing down and solidifying the creation line and penetrating the concrete module the pipeline (would it be a good idea for it be found that a concrete plug exists in the line while estimating the concrete behind the line with an electric thermometer). Keywords: wellhead, security pipeline casing, sealings, wedge, cuff, metal sealing, Hanging - sealing.
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Kolodkina, Valentina I. "ANALYSIS OF THE CLINICAL EFFICIENCY OF RESTORATIVE FILLING MATERIALS." Kuban Scientific Medical Bulletin 26, no. 2 (May 17, 2019): 64–70. http://dx.doi.org/10.25207/1608-6228-2019-26-2-64-70.
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Aim. To conduct a clinical assessment of short- and long-term surface sealing in patients having a different hygienic status of the oral cavity.Materials and methods. For clinical trials, a group of 250 male and female patients aged 25–45 years old and diagnosed with Black’s class III and V carious lesions was selected. All patients were divided into three groups depending on the state of oral hygiene and the applied methods of aesthetic restoration: control group — defect restoration by Filtek Z-250 microhybrid composite (3M ESPE); comparison group — Filtek Z-250 restoration (3M ESPE) + Easy Glaze (Voco) surface sealing on the day of restoration; and the main group with three subgroups: 2α subgroup — Restavrin restoration + Easy Glaze sealant on the day of treatment; 2β subgroup — Restavrin restoration + Easy Glaze sealant on the day of treatment and re-sealing with a frequency of 1 time per year; 2γ subgroup — Restavrin restoration + Easy Glaze sealant on the day of treatment and re-sealing with a frequency of 1 time per 6 months. The quality of caries cavities was assessed by USPHS criteria, including anatomical shape (AS), marginal pigmentation (MP), marginal adaptation (MA), the presence of secondary caries (SC) and sensitivity (S). The evaluation was conducted on the day of the visit and following 6, 12 and 24 months.Results. A comparison of the clinical evaluation of photocomposite restorations by the Filtek Z-250 (3M ESPE) microhybrid composite in the control group of patients, in comparison group and in the main Restavrin (Technodent) group showed that the Easy Glaze (Voco) surface sealing of the Restavrin composite restorations carried out in the 2α subgroup of the main group onе time on the day of restoration, in the 2β subgroup with re-sealing after 12 months, and in the 2γ subgroup with sealing every 6 months had allowed the maximum number of restorations to be corresponded to the “satisfactory” value according to the AS, MP, MA, SC, S evaluation criteria throughout the entire observation period.Conclusion. The Restavrin (Technodent, Russia) polymeric nanohybrid fi lling material is shown to produce the most effective and durable restorations compared to other materials under study. The applicatiyon of Restavrin followed by the Easy Glaze (Voco) sealing protective system with a frequency dependent on the hygienic status of the oral cavity allows therapeutic methods for dentin caries treatment to be optimized.
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Mizuno, Y., R. Mizuta, M. Hashizume, and T. Taguchi. "Enhanced sealing strength of a hydrophobically-modified Alaska pollock gelatin-based sealant." Biomaterials Science 5, no. 5 (2017): 982–89. http://dx.doi.org/10.1039/c6bm00829a.
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Masson, J.-F., C. Lauzier, P. Collins, and M. A. Lacasse. "Sealant Degradation during Crack Sealing of Pavements." Journal of Materials in Civil Engineering 10, no. 4 (November 1998): 250–55. http://dx.doi.org/10.1061/(asce)0899-1561(1998)10:4(250).
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Hagberg, Robert C., Hazim J. Safi, Joseph Sabik, John Conte, and Jon E. Block. "Improved Intraoperative Management of Anastomotic Bleeding during Aortic Reconstruction: Results of a Randomized Controlled Trial." American Surgeon 70, no. 4 (April 2004): 307–11. http://dx.doi.org/10.1177/000313480407000408.
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In a randomized controlled trial, the effectiveness of a polymeric surgical sealant (CoSeal) was compared to Gelfoam/thrombin for managing anastomotic bleeding after implantation of Dacron grafts during aortic reconstruction for nonruptured aneurysms. Each treatment was directly applied to the suture line after confirmation of anastomotic bleeding. The proportion of suture line sites that achieved immediate sealing and the proportion sealed within 5 minutes were determined among 37 experimental (59 sites) and 17 control subjects (27 sites). A significantly greater proportion of bleeding suture line sites treated with the polymeric sealant achieved immediate sealing following reestablishment of blood flow compared with control-treated sites [48 of 59 (81%) vs 10 of 27 (37%); P = 0.002]. The difference between treatment groups was maintained after 5 minutes with approximately 85 per cent (50 of 59) of CoSeal sites compared to just over one-half (14 of 27) of control sites demonstrating ultimate sealing ( P = 0.01). There were no adverse events related to the use of the polymeric sealant in this study. These results support the use of this novel sealant for the intraoperative management of anastomotic bleeding during aortic reconstruction procedures.
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Zhang, Fu Ying, Xi Mei Lu, Ping Wang, and Qing Ping He. "Efficiency-Reinforcement Design of Hydraulic Reciprocating Sealing Element Driven by TRIZ Technology Evolution." Materials Science Forum 628-629 (August 2009): 97–102. http://dx.doi.org/10.4028/www.scientific.net/msf.628-629.97.
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The efficiency reinforcement technologies of sealing is important for improving sealing’s reliability and effectivity which result in zero leakage. Technology evolution of TRIZ can be used to forecast the future technology in products. These future technologies can guide a designer along the right direction of developing a new product. In this paper, the efficiency-reinforcement principle of hydrodynamic reciprocating sealing is discussed, technology evolution of TRIZ is integrated with the efficiency reinforcement design of hydrodynamic reciprocating sealing element to predict its future structure state. A new cross section shape of reciprocating sealing element corresponding to the predicted structure state is presented. The computational model of the new reciprocating seal element is established with ANSYS, and its stress, strain and pressure distribution are also analyzed. The results demonstrated that the presented seal elemente outperforms the old O-ring seal in efficiency reinforcement capacity.
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Shao, Qianqiu, and Songhai Fan. "Parameter measurement of cable lead sealing using an eddy current system." Insight - Non-Destructive Testing and Condition Monitoring 65, no. 6 (June 1, 2023): 306–12. http://dx.doi.org/10.1784/insi.2023.65.6.306.
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Lead sealing is one of the key accessories for high-voltage cables and its quality directly affects the security and stability of such cables. In order to reduce the accident rate in power processing caused by lead sealing issues, it is necessary to carry out non-destructive testing and evaluation. Due to the bending surface of lead sealings, it is difficult to detect their conductivity and thickness accurately using existing eddy current (EC) testing methods. In this paper, measurements of conductivity and thickness for curved specimens are analysed and an accurate method is subsequently proposed. Firstly, the measurement methods of conductivity and thickness are established based on the transformer model. It is found that the conductivity and thickness can be detected using phase signature at high and low frequencies, respectively. Secondly, the influence of curvature on the phase signature is analysed and the conductivity and thickness measurements of lead sealing are corrected using curvature correction coefficients. Finally, an EC system is built and experiments are carried out to evaluate the novel methods. The results show that the methods achieve a good level of accuracy in detecting the conductivity and thickness of curved lead sealings.
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Qvist, V., M. K. Borum, K. D. Møller, T. R. Andersen, P. Blanche, and A. Bakhshandeh. "Sealing Occlusal Dentin Caries in Permanent Molars." JDR Clinical & Translational Research 2, no. 1 (November 23, 2016): 73–86. http://dx.doi.org/10.1177/2380084416680191.
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The purpose of this study was to investigate the possibility of postponing restorative intervention of manifest occlusal caries in young, permanent dentition by non-invasive sealing. This RCT-designed study included 521 occlusal lesions in 521 patients aged 6 to 17 y. Based on clinical and radiographic assessments, all lesions required restorative treatment. After randomization (ratio 2:1), 368 resin sealings and 153 composite–resin restorations were performed by 68 dentists in 9 municipalities. The primary aims were to 1) analyze survival of sealings until replacement by restoration, 2) compare longevity of sealings and restorations until retreatments, and 3) compare effectiveness of sealings and restorations to halt caries progression in sealed lesions and beneath restorations. Furthermore, we aimed to identify factors influencing longevity and the effectiveness of sealings and restorations. Treatments were annually controlled, clinically and radiographically. After 7 y, the drop out rate was 8%, and 54% of the treatments were completed due to age. Of the sealings, 48% were retreated, including 31% replaced by restorations; 12% were still functioning. Of the restorations, 7% were repaired/renewed and 20% were still functioning. No endodontics was performed. Kaplan–Meier and Cox regression survival analyses were performed on 341 sealings and 152 restorations in first and second molar teeth. The 7-y survival was 37% (CI, 29% to 45%) for sealings and 91% (CI, 85% to 96%) for restorations (P < 0.001). The median survival time for sealings not replaced by restorations was 7.3 y (CI, 6.4 y to NA). Survival of sealings was increased in patients with low caries risk and/or excellent oral hygiene, second molars compared with first molars, and lesions not extending the middle one-third of the dentin. Survival of sealings was not influenced by municipality, sex, eruption stage or clinical surface cavitation. The results underline that it is possible to postpone or avoid restorative intervention of occlusal dentin caries lesions in young permanent teeth by non-invasive sealing. Knowledge Transfer Statement: The first restoration can ultimately be fatal for a young permanent tooth. A restoration may not be the final treatment but the start of an ongoing treatment with still more loss of tooth substance. The present study shows the possibility of treating occlusal dentin caries lesions with non-invasive resin sealings instead of conventional resin composite restorations in children and adolescents. Improved oral health can be expected.
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Shober, Stephen F. "The Great Unsealing: A Perspective on Portland Cement Concrete Joint Sealing." Transportation Research Record: Journal of the Transportation Research Board 1597, no. 1 (January 1997): 22–33. http://dx.doi.org/10.3141/1597-04.
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The general mission of most transportation agencies is to ensure a customer focus in the development and operation of a safe and efficient transportation system. The customers desire comfort, convenience, safety, and cost-effectiveness in a transportation system. Agency research must have the objectives of addressing customer-related issues and measuring benefits of importance to them. Accordingly, any joint and sealant research must answer the questions, Why do we seal? and Is it cost-effective? Joint and sealant studies of portland cement concrete (PCC) pavements must address whether joint sealing enhances total pavement performance and is cost-effective, and, if so, what sealant system should be used. The Wisconsin Department of Transportation (WisDOT) has been studying the effect of PCC joint/crack sealing on total pavement performance for 50 years. By 1967 there was substantial documentation that filling and refilling of contraction joints had no beneficial effect on pavement performance. By 1984, it was concluded that pavements with unsealed joints had better overall performance (distress, ride, materials integrity) than pavements with sealed joints. In 1990, WisDOT passed a policy eliminating all PCC joint sealing, in new construction and maintenance. This "no-seal" policy has saved Wisconsin $6,000,000 annually with no loss in pavement performance and with increased customer safety and convenience. The entire PCC sealing issue is beginning to be addressed at the national level, ensuring no false assumptions and with the customer’s needs in view.
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Wussler, Desiree, Selina Kiefer, Susanne Naumann, Danilo Hackner, Jonathan Nadjiri, Stephan Meckel, Jörg Haberstroh, et al. "Evaluation of a biocompatible sealant for on-demand repair of vascular defects—a chronic study in a large animal model." Interactive CardioVascular and Thoracic Surgery 30, no. 5 (March 11, 2020): 715–23. http://dx.doi.org/10.1093/icvts/ivaa012.
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Abstract OBJECTIVES Existing surgical sealants fail to combine design requirements, such as sealing performance, on-demand activation and biocompatibility. The aim of this study was to compare the effectiveness and safety of the SETALIUM™ Vascular Sealant (SVS), a novel, on-demand activatable sealant, with the commercial sealant, BioGlue®, for the repair of vascular defects. METHODS In an in vivo porcine model, the use of SVS was compared with BioGlue, for sealing 2-mm defects of the carotid artery and jugular vein. Animals were followed for 7 days and 5 weeks (each time point and per experimental group, n = 4), respectively. The degree of stenosis and flow velocity was determined, and the local tissue response was evaluated. RESULTS In vivo incision closure succeeded in all cases, and SVS was superior in clinical usability, enabled by its on-demand activation. Unlike BioGlue, SVS use did not induce stenosis and was associated with physiological blood flow in all cases. Moreover, closure with SVS was associated with a low inflammatory reaction and no thrombus formation or intima proliferation, in contrast to BioGlue. CONCLUSIONS SVS demonstrated effective and rapid sealing of 2-mm vascular defects, with favourable biocompatibility compared to BioGlue. Thus, SVS seems to be an effective and safe vascular sealant.
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Galimzyanova, Reseda Y., Maria S. Lisanevich, and Yuri N. Khakimullin. "Sealing Materials Based on Polymers." Key Engineering Materials 869 (October 2020): 93–100. http://dx.doi.org/10.4028/www.scientific.net/kem.869.93.
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Polymer-based sealing materials currently play a large and important role in almost all areas of industry. The use of sealants can increase the energy saving of building structures, the safety of vehicles, etc. Sealants are equally used in such specialized applications as the aerospace field, and are also used to solve everyday problems, such as sealing plumbing. The main consumption of sealants is in construction and automotive. This review provides data on the global and domestic market for sealing materials; The basic terms and definitions used in the field of adhesive and sealing materials are analyzed. The main differences between the terms adhesive and sealant are discussed. The classification of sealants is given in accordance with modern international regulatory documents. It is disassembled that they are one-component reactive hot-melt sealants. Their main advantages and disadvantages are listed. It is noted that the development of the industry of sealing materials is likely to move towards the development of moisture-curing compositions based on silane-modified polymers. This assumption is supported by a fairly detailed classification of silane-modified polymers in the FEICA classification guide for sealants and adhesives.
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Shkhagosheva, A. A., E. E. Maslak, and D. I. Fursik. "The results of self-etching self-adhesive flowable composite application for primary molars fissure sealing in children." Pediatric dentistry and dental profilaxis 21, no. 2 (July 17, 2021): 113–17. http://dx.doi.org/10.33925/1683-3031-2021-21-2-113-117.
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Relevance. The use of light-cure sealants and flowable composites for fissure sealing in children is difficult due to the complexity of the procedure. The research aimed to study the efficiency of self-etching self-adhesive flowable composite for fissure sealing in primary molars in children.Materials and methods. The Local Ethical Committee permission and written informed voluntary consents from the parents were obtained before the study. Non-invasive fissure sealing with self-etching self-adhesive flowable composite (Constic, DMG, Germany) was performed in 48 primary molars in 48 children aged 2-5 years (mean 41.2 ± 1.3 months). After 6, 12, 18 and 24 months, the sealant’s retention (%) and frequency (%) of occlusal caries development, and 95% confidence intervals (CI) were calculated. The significance of the difference was assessed by the Student’s t-test.Results. After 6 and 12 months, complete sealant’s retention was revealed in 75.0% (CI 61.2-85.1%) and 60.4% (CI 46.3-73.0%) molars, p > 0.05; it decreased to 27.1% (CI 16.6-41.0%) and 18.7% (CI 10.2-31.9%), p > 0.05, after 18 and 24 months. Complete loss of the sealant was noted in 8.3-18.7% cases. The first caries lesion (2.1%, CI 0.4-10.9%) on the surface with the lost sealant was revealed after 12 months, after 24 months – 4.2% (CI 1.1-14.0%).Conclusions. In primary molars after non-invasive fissure sealing with self-etching self-adhesive flowable composite, complete loss of the sealant was from 8.3% to 18.7% after 6-24 months post-op, partial loss was from 8.3% to 31.3%. Occlusal caries was revealed in 6.3% cases after the sealant loss.
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Beresescu, Liana, Monika Kovacs, Alexandru Vlasa, Alexandra Mihaela Stoica, Csilla Benedek, Mihai Pop, Denisa Bungardean, and Daniela Eșian. "Retention Ability of a Glass Carbomer Pit and Fissure Sealant." International Journal of Environmental Research and Public Health 19, no. 4 (February 10, 2022): 1966. http://dx.doi.org/10.3390/ijerph19041966.
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Dental sealants are an excellent means to prevent pits and fissure decay. Currently, there are multiple commercially available sealant materials. The purpose of this study was to assess the retention of glass carbomer fissure sealant and the incidence of secondary caries over a period of 24 months in comparison with a resin-based sealant. Materials and Methods: We included 32 children in the study, with ages between six and eight years and an average age of 6.8 years old. For each child, we sealed four permanent molars (totaling 128 teeth). The study group was divided into sub-groups. Sub-group A was represented by 64 first permanent molars which underwent dental sealing procedures with composite resin-based fissure sealant, Helioseal F™, and sub-group B was represented by 64 first permanent molars which underwent dental sealing procedures with glass carbomer cement, GCP Glass Seal™. The sealants were assessed clinically at 6, 12, 18, and 24 months. Results: The 6-month follow-up evaluation showed no statistically significant differences between the two materials neither regarding sealant retention nor new carious lesions formation (p > 0.05). At the 12-month recall, 57 molars had good retention (89.06%) from sub-group A and 44 molars (68.75%) from sub-group B; there was a statistically significant difference (p = 0.0187) between the two treatment choices only regarding material retention. At the last recall after 2 years, sub-group A had a higher number of molars with perfect sealing (47–73.43%) and 8 molars (12.5%) with new caries lesions and sub-group B had 23 (35.93%) molars with perfect sealing and 15 molars (23.44%) with new caries lesions; there was a statistically significant difference (p < 0.0001) between the two treatment choices only regarding material retention. Conclusions: The glass carbomer retention is very inferior to the resin-based material. The glass carbomer sealant was effective in preventing new caries development, comparable with the conventional resin-based sealant.
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Annabi, Nasim, Yi-Nan Zhang, Alexander Assmann, Ehsan Shirzaei Sani, George Cheng, Antonio D. Lassaletta, Andrea Vegh, et al. "Engineering a highly elastic human protein–based sealant for surgical applications." Science Translational Medicine 9, no. 410 (October 4, 2017): eaai7466. http://dx.doi.org/10.1126/scitranslmed.aai7466.
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Surgical sealants have been used for sealing or reconnecting ruptured tissues but often have low adhesion, inappropriate mechanical strength, cytotoxicity concerns, and poor performance in biological environments. To address these challenges, we engineered a biocompatible and highly elastic hydrogel sealant with tunable adhesion properties by photocrosslinking the recombinant human protein tropoelastin. The subcutaneous implantation of the methacryloyl-substituted tropoelastin (MeTro) sealant in rodents demonstrated low toxicity and controlled degradation. All animals survived surgical procedures with adequate blood circulation by using MeTro in an incisional model of artery sealing in rats, and animals showed normal breathing and lung function in a model of surgically induced rat lung leakage. In vivo experiments in a porcine model demonstrated complete sealing of severely leaking lung tissue in the absence of sutures or staples, with no clinical or sonographic signs of pneumothorax during 14 days of follow-up. The engineered MeTro sealant has high potential for clinical applications because of superior adhesion and mechanical properties compared to commercially available sealants, as well as opportunity for further optimization of the degradation rate to fit desired surgical applications on different tissues.
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Jeřábek, David. "Clay Sealings from the Pyramid Complex of King Raneferef Kept in the Náprstek Museum: General Features of the Corpus and its Potential to the Study of the Administration of the Royal Funerary Cult." Annals of the Náprstek Museum 39, no. 2 (2018): 19–38. http://dx.doi.org/10.1515/anpm-2018-0011.
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In the 1980s, the excavations of the Czechoslovak Institute of Egyptology headed by Miroslav Verner excavated large parts of the pyramid complex of King Raneferef (Neferefre)2 and uncovered evidence of the mortuary cult of the king, including ca. one thousand of clay sealings (or sealing fragments). Out of them, a corpus of over three hundred sealings was acquired by National Museum – Náprstek Museum of Asian, African and American Cultures. In most aspects, they make a representative sample of the whole corpus. This paper presents in summary properties of the corpus relevant to the interpretation of the temple administration as it is reflected in the sealing activity.3 After a brief introduction to the site and the organization of the excavated corpus, the attention will be focused particularly on the general patterns of the distribution of sealings with regard to space, type, and attested epigraphical features (titles, names of gods and institutions, other iconographical features), as these are the means to uncover potential correlations between the activity of holders of particular offices (or representatives of particular institutions), particular parts of the temple and particular types of sealings (i.e. particular kinds of sealed containers).
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Boháček, A., J. Šlanhof, and A. Průcha. "Resistance of a sealed joint subjected to tensile stress at different temperatures." IOP Conference Series: Materials Science and Engineering 1252, no. 1 (September 1, 2022): 012007. http://dx.doi.org/10.1088/1757-899x/1252/1/012007.
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Abstract In this paper, research on the topic of Resistance of a sealed joint subjected to tensile stress at different temperatures is presented. Tensile stress is one of the physical effects acting on conventional structures. This research specifically deals with the sealing of problematic material. Aquapanel cement board is chosen as the problematic material. This board has a large amount of fine dust particles on its surface, which prevent the sealant from adhering properly to the base material. Next, two sealants and the appropriate primers are selected. The sealants used were selected based on the manufacturer's recommendations on suitability for use in sealing cementitious materials. From these three components, the Aquapanel cement board, the sealant and the primer, test specimens are made, which are tested according to the valid European standard. The results of this test are carefully recorded and further analysed. Based on the results of this test, it is possible to recommend both tested sealants for sealing cement materials that are exposed to tensile stress at different temperatures.
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Muntean, Alexandrina, Sorina Sava, Sarosi Codruta, Marioara Moldovan, Mariana Pacurar, and Ada Gabriela Delean. "Assessment of Water Sorption, Solubility and Interface Properties for Two Different Pit and Fissure Sealants." Materiale Plastice 57, no. 3 (September 30, 2020): 81–88. http://dx.doi.org/10.37358/mp.20.3.5382.
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The purpose of modern dental medicine is to prevent dental caries and promote minimally invasive techniques at the expense of invasive methods. Dental sealants are largely recommended for occlusal surfaces protection, but concerns are related about microleakage at material-enamel interface. This in vitro study aimed to investigate the association between chemical structure, sealing capacity and marginal infiltration for 2 fluoride F containing commercially available resin-based sealants: Pit&Fissure� Sealant (DMP) and Fissurit FX� (Voco) in order to achieve a better description and ensure adequate material selection in every day practice. An optimal resin-based sealant should mimic the structural, physical and mechanical characteristics of enamel. The main difference between the sealing materials tested is based on the amounts of inorganic filler and on the various shapes of the particles in the filler. Pit&Fisure� Sealant express less attachment at enamel interface, higher sorption and greater water solubility, when compared to Fissurit FX�. The better sealing capacity of Fissurit FX� can be described by the homogeneity of the material and the very small size of the inorganic fillers. Dental materials properties used as pit and fissure sealants are sensitive to mechanical, thermic and chemical stress from oral cavity. Regular dental check-up can detect the presence and integrity of sealant and ensure preventive effect in time.
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Shao, Qianqiu, Songhai Fan, and Fenglian Liu. "Research on Deep Defect Detection Method of Cable Lead Sealing Based on Improved Pulsed Eddy Current Excitation." Electronics 11, no. 15 (August 4, 2022): 2428. http://dx.doi.org/10.3390/electronics11152428.
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In order to reduce power failures caused by lead sealing defects, it is necessary to carry out nondestructive testing of cable lead sealings. However, previous studies have focused on the detection of surface and near-surface defects of lead sealings. Thus, an improved pulsed eddy current detection (IPECD) method is introduced to detect the deep defects of cable lead sealings (with depths ranging from 6 to 12 mm), and the frequency range selection principle and the optimization method of initial phase angles of different frequency components of IPECD, used to maximize the peak value of the excitation signal, are first explained in detail. Then, the detection sensitivities of the deep defects before and after the optimization are compared and analyzed based on a simulation. Finally, using the IPECD method, experiments are conducted to study the effects of the defect depth on features of the lift-off point of intersection and the zero-crossing time, enhancing the foundation for the prediction or rapid detection of the depth of lead sealing defects.
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HATAZAWA, Masayasu. "E24 Sealing Performance of Sealant Self-circulated Viscoseal." Proceedings of Conference of Kyushu Branch 2008 (2008): 209–10. http://dx.doi.org/10.1299/jsmekyushu.2008.209.
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Robinson, Chase. "Neck-Sealing in early Islam." Journal of the Economic and Social History of the Orient 48, no. 3 (2005): 401–41. http://dx.doi.org/10.1163/156852005774342885.
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AbstractArabic and Syriac sources for early Islam, especially for seventh- and eighth-century Syria and Iraq, describe the use of neck sealings in the administration of the poll tax, which was levied upon non-Muslims. This article evaluates the relevant literary, historical and material evidence, including some surviving sealings, and proposes that at origin, neck-sealing related to other stigmatizing practices, and was principally symbolic and punitive. Des texts arabes et syriques, particulièrement originaires de la Syrie et de l'Iraq des septième et huitième siècles, décrivent l'usage des sceaux en pendentif pour l'application de la capitation qui était imposée aux non-musulmans. Cet article étudie les sources littéraires, historiques et archéologiques, y compris des sceaux qui nous restent, et suggère que à l'origine, les sceaux étaient liés à d'autres pratiques discriminatives/stigmatisantes, et étaient avant tout symboliques et punitives.
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Putri, Renty Anugerah Mahaji. "PENGUKURAN PRODUKTIVITAS PARSIAL DI PT. ANEKA CIPTA SEALINDO." Jurnal Teknologi 9, no. 1 (January 3, 2017): 13. http://dx.doi.org/10.24853/jurtek.9.1.13-20.
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PT. Aneka Cipta Sealindo (PT. ACS) merupakan perusahaan manufaktur yang memproduksi sealing system, kondisi saat ini adalah bahwa PT. ACS tidak melakukan evaluasi secara berkala atau continue dari kondisi produktivitasnya. Sehingga dirasa perlu untuk diketahui dalam mewaspadai kondisi saat ini serta dalam hal meningkatkan kemampu labaan perusahaan. Banyak hal yang dapat diketahui dan diukur dalam hal peningkatan performance perusahaan. Perusahaan dapat mempunyai bayangan kondisi actual saat ini dibandingkan dengan target perusahaan. Serta dapat memberikan masukkan, apa saja yang perlu diantisipasi perusahaan dalam meningkatkan produktivitasnya. Sehingga dalam mengetahui serta mengevaluasinya, dibuatlah sebuah pengukuran produtivitas dengan hasil Produktivitas Tenaga Kerja 34 pieces/orang/hari, Produktivitas Jam Kerja 18 pieces/jam/hari& Produktivitas Hasil sealing system tipe Ecorubber 2 (Viton) 95.6 %. Produktivitas Tenaga Kerja 36 pieces/orang/hari, Produktivitas Jam Kerja 19 pieces /jam/hari & Produktivitas Hasil sealing system tipe Ecorubber 1 (NBR) 97.1 %. Produktivitas Tenaga Kerja 34 pieces/orang/hari , Produktivitas Jam Kerja 17 pieces /jam/hari & Produktivitas Hasil sealing system tipe T-Ecopur (T-PU) 82.3 %.
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Boháček, Adam, and Jiří Šlanhof. "Properties of Bonding Sealants in the Sealing of Cement-Based Materials." Key Engineering Materials 898 (August 27, 2021): 19–25. http://dx.doi.org/10.4028/www.scientific.net/kem.898.19.
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This paper describes the issue of sealing cement-based materials. These materials can also include concrete elements or cement fiber boards. For the purposes of this work, a cement fiber material is selected, namely glass. This material has good effects in terms of small dust particles on the surface, which damage the bonding sealant and the substrate. Focus on its suitability for sealing cement-based substrates. The method for determining the properties of the sealant and the properties of the stylistic joint between the sealant and the base material is the tensile test. For the purpose of this test, one representative of neutral silicones, one representative of acetate silicones and one representative for acrylic sealants shall be selected. From the results of the tensile test, it is clear that with a suitable choice of the combination of bonding sealant and primer, it is possible to seal such a problematic substrate with good results.
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Bennett, D. A., X. Feng, and S. A. Velinsky. "Robotic Machine for Highway Crack Sealing." Transportation Research Record: Journal of the Transportation Research Board 1827, no. 1 (January 2003): 18–26. http://dx.doi.org/10.3141/1827-03.
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An operator-controlled crack-sealing machine was developed and tested at the Advanced Highway Maintenance and Construction Technology (AHMCT) Research Center at the University of California, Davis. The machine, integrated onto a single truck, provides ease of operation and a simple, automated method of sealing random pavement cracks. The operator provides the machine its tasks and is the decision maker; the machine automatically performs the repetitive and dangerous tasks of mapping pavement cracks, creating seal paths for the robot, and sealing the cracks. The operator communicates with the machine through a simple user interface adjacent to the driver. This operator control approach drastically reduces the machine’s control complexity relative to fully automated crack-sealing machines. To be able to seal cracks within a full lane without intruding into adjacent lanes, a telescoping long-reach robotic arm was developed that can position the sealing head mounted to its end in a large 3.7- x 4-m (12- x 13-ft) workspace, within 0.4 mm (1/64 in.) at a traverse speed up to 1 m/s (3 ft/s). A special sealant applicator that deploys a pressurized reservoir was developed to allow high-speed and automated sealing operations. A 100-Mbps fast Ethernet and 10-Mbps wireless control network allows for distributed real-time motion control, input/output control, and machine vision. A fully object-oriented, multithreaded Internet-based software architecture allows reliable and efficient system integration and provides an interactive and responsive user interface for feature-rich and easy imaging, path planning, and system control.
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Sawa, T., R. Sasaki, and M. Yoneno. "An Analysis of Pipe Flange Connections Using Epoxy Adhesives/Anaerobic Sealant Instead of Gaskets." Journal of Pressure Vessel Technology 117, no. 4 (November 1, 1995): 298–304. http://dx.doi.org/10.1115/1.2842127.
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This paper deals with the strength and the sealing performance of pipe flange connections combining the bonding force of adhesives with the clamping force of bolts. The epoxy adhesives or anaerobic sealants are bonded at the interface partially instead of gaskets in pipe flange connections. The stress distribution in the epoxy adhesives (anaerobic sealant), which governs the sealing performance, and the variations in axial bolt force are analyzed, using an axisymmetrical theory of elasticity, when an internal pressure is applied to a connection in which two pipe flanges are clamped together by bolts and nuts with an initial clamping force after being joined by epoxy adhesives or anaerobic sealant. In addition, a method for estimating the strength of the combination connection is demonstrated. Experiments are performed and the analytical results are consistent with the experimental results concerning the variation in axial bolt force and the strength of combination connections. It can be seen that the strength of connections increases with a decrease in the bolt pitch circle diameter. Furthermore, it is seen that the sealing performance of such combination connections in which the interface is bonded partially is improved over that of pipe flange connections with metallic gaskets.
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Schwimmer, Yair, Nurit Beyth, Diana Ram, Eitan Mijiritsky, and Esti Davidovich. "Laser Tooth Preparation for Pit and Fissure Sealing." International Journal of Environmental Research and Public Health 17, no. 21 (October 26, 2020): 7813. http://dx.doi.org/10.3390/ijerph17217813.
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Objectives: Various approaches are available for pit and fissure sealing, including: the use of sealants, with or without mechanical preparation; the use of etching, with or without bonding; and the use of lasers as an alternative to mechanical preparation. The objective of this study is to evaluate pit and fissure sealing by comparing the retention and microleakage of sealants, between mechanical and Er:Yag laser enamel preparation. Methods: Sixty extracted sound third molars are classified into six groups: A, bur mechanical preparation and sealant application; B, bur mechanical preparation, etching and sealant; C, bur mechanical preparation, etching, bonding and sealant; D, laser mechanical preparation and sealant; E, laser mechanical preparation, etching and sealant application; F, laser mechanical preparation, etching, bonding, and sealant. Statistical analysis methods include Fisher’s exact test, a general linear model for one-way analysis of variance (ANOVA) of multiple comparisons, and Bonferroni multiple comparison tests. Results: All the groups showed dye microleakage beneath the sealants. Less microleakage was observed for those that used bur rather than laser, 41 versus 44 specimens, respectively. The number of specimens without microleakage decreased as follows: group E (24), group A (18), groups B and F (17), group C (14), and group D (5). Retention was 100% in all groups except group D. Conclusion: Mechanical preparation increases retention of sealants, especially when etching material is used; additionally, bonding can help the retention. The best technique is mechanical preparation via laser and subsequent use of etching, without bonding prior to application of the dental sealant.
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Gudkov, Sergii, Volodymyr Martsynkovskyy, and Czeslaw Kundera. "An Analysis of Axial Vibration in Face Packing Seals." Solid State Phenomena 248 (March 2016): 142–51. http://dx.doi.org/10.4028/www.scientific.net/ssp.248.142.
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This paper deals with the dynamics of face packing seals, in which one of the sealing rings is made of elastic sealant. The study involved analyzing the axial vibration of the flexible ring for two configurations of its housing in the seal and determining the frequency characteristics and the condition of maintaining face-to-face contact between the sealing rings with considerably different elastic properties subjected to two types of external excitations. The derived analytical relationships were verified using a calculation example for real operating conditions of face packing seals in two pumps.
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Markovic, Dejan, Bojan Petrovic, Tamara Peric, and Duska Blagojevic. "Microleakage, adaptation ability and clinical efficacy of two fluoride releasing fissure sealants." Vojnosanitetski pregled 69, no. 4 (2012): 320–25. http://dx.doi.org/10.2298/vsp1204320m.
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Background/Aim. Retention of fissure sealants and good adaptation to enamel are essential for their success. Fluoride releasing resin-based materials are widely accepted for pit and fissure sealing, but newly designed glass ionomers can serve as a good alternative. The aim of this study was to evaluate microleakage and sealing ability in vitro, and to clinically assess two fluoride releasing fissure sealants. Methods. The sample for experimental study consisted of 20 freshly extracted intact human third molars, divided in two experimental groups according to the sealing material: fluoride releasing resin-based (Heliosel F) and glass ionomer (Fuji Triage) material. Digital images and scanning electron microscope were used to assess microleakage and adaptation ability. Sample for clinical study consisted of 60 children, aged 6-8 years, with high caries risk, divided in two groups according to the sealant material. Fissure sealant was applied to all erupted, caries-free first permanent molars. Sealants were evaluated after 3, 6 and 12 months using modified Ryge criteria for retention, marginal adaptation, colour match, surface smoothness and caries. Results. Microleakage was detected in more than half of the specimen, without significant differences between the two groups (p > 0.05). Both materials exhibited acceptable sealing ability. Complete retention at the end of the observation period was 81.8% for resin-based, and 21.1% for glass-ionomer fissure sealant (p < 0.001). The presence of caries in sealed molars has been detected in one patient in both groups. During the 12-month observation period, Helioseal F demonstrated better retention, marginal adaptation and surface smoothness (p < 0.001). There were no differences between the two materials regarding caries and color match (p > 0.05). Conclusion. Both tested materials demonstrate satisfactory clinical and caries prophylactic characteristics that justify their use in contemporary preventive dentistry.
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Hevinga, M. A., N. J. M. Opdam, J. E. Frencken, E. M. Bronkhorst, and G. J. Truin. "Can Caries Fissures be Sealed as Adequately as Sound Fissures?" Journal of Dental Research 87, no. 5 (May 2008): 495–98. http://dx.doi.org/10.1177/154405910808700514.
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Sealing caries fissures is considered an appropriate treatment option for arresting the caries process. However, little information is available regarding the sealing of occlusal cavitated dentin lesions. The hypothesis tested in this in vitro study was that no difference in microleakage and sealant penetration depth exists between cavitated and sound sealed fissures when a resin is used. Eighty molars, each with an occlusal cavitated dentin lesion, were treated according to 5 experimental protocols and compared with a control group of sealed sound molars. In the experimental groups, fissure sealants were placed with and without an adhesive, and in various ways. All teeth were sectioned, and microleakage and sealant penetration into the fissure were evaluated. Sealed caries fissures showed significantly more microleakage and insufficient sealant penetration depth than sound fissures. Neither the use of an adhesive nor its intermediate curing influenced the microleakage score and the penetration ability of sealants.
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Gong, Yafeng, Shuzheng Wu, Yuwei Zhang, Yunze Pang, and Yulin Ma. "Investigation of the High-Temperature and Rheological Properties for Asphalt Sealant Modified by SBS and Rubber Crumb." Polymers 14, no. 13 (June 23, 2022): 2558. http://dx.doi.org/10.3390/polym14132558.
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Crack sealing is an important measure for pavement maintenance. Hot-poured crack sealant is the most utilized material for crack sealing. However, its poor high-temperature and rheological properties seriously weaken the mechanical properties of repaired pavement. Thus, to overcome the disadvantage of the poor high-temperature and rheological properties of sealant, styrene–butadiene–styrene (SBS) and rubber crumb (CR) were utilized for modifying the asphalt-based sealants. Softening point tests, temperature tests, frequency scan tests, and multiple stress creep recovery tests (MSCR) were conducted to evaluate the high-temperature and rheological properties of the modified sealant. Additionally, the influence of SBS and CR on the high-temperature performance of the modified sealant was quantitatively analyzed by the grey relational analysis method. The results reveal that the SBS has a greater enhancement effect on the high-temperature performance of sealant than CR. Increasing the SBS and CR content in the sealant could enhance the sealant’s high-temperature performance, stiffness, and elasticity. Compared with asphalt-based sealant and one-component modified asphalt-based sealant, SBS/CR-modified asphalt sealant has greater viscosity and higher temperature deformation resistance. Additionally, SBS can increase the stress level of the sealant, thereby enhancing the resistance of the sealant to permanent deformation.
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Park, Heakyoung. "Sealing dispensing requirements to meet MEMS packaging and throughput impact." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2013, DPC (January 1, 2013): 000535–70. http://dx.doi.org/10.4071/2013dpc-ta33.
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The MEMS industry has gained big momentum recently with significant unit growth, especially in the consumer market. While traditional MEMS devices like automotive accelerators have established high-volume manufacturing processes and packages with high reliability, most MEMS devices have been fragmented in packaging because of their unique requirements and small volumes, resulting in high packaging costs. In the cost-sensitive consumer market, devices such as MEMS microphones, accelerometers, and gyroscopes in mobile devices have rapidly increased their production volume and chased lower packaging cost while accepting relatively less reliability than traditional devices. Sealing dispensing can be applied to device or cap wafer for wafer capping process. Wafer capping protects active MEMS from dicing process after release because the additional cavity wafer with sealing covers the MEMS structure. There are manufacturing challenges because wafer capping requires precise alignment and a variety of bonding methods have technical drawbacks. Printing is one way to deposit sealing lines to cap wafers, but consumes a relatively wide area and may not work if the sealing line must go onto the MEMS die wafer. Sealing line can also be applied to organic substrate that contains MEMS device and ASIC and then lid is attached for bonding in cavity packages. Previous paper covered technical requirements for dispensing sealant, volumetric accuracy, and motion systems to meet packaging trends and addressed manufacturing cost reductions. This paper will include investigating the impact on the throughput model due to size reduction efforts in packaging. More dies can be produced per given wafer size, which means there is more dispensing area per wafer. In addition, sealing line requirements will be more challenging, and so this paper will address these demands.
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Huang, Xiaoyu, Jinghui Zhao, Yichun Wang, Yuchao Ke, and Zixi Wang. "Study on a New Static Sealing Method and Sealing Performance Evaluation Model for PEMFC." World Electric Vehicle Journal 12, no. 4 (November 11, 2021): 237. http://dx.doi.org/10.3390/wevj12040237.
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The long-term stability and durability of seals are critical for various instruments and types of equipment. For static sealing, an important sealing state, there are currently two representative sealing methods, namely, pre-compressing static sealing and adhesive static sealing. In this paper, the characteristics and shortcomings of these sealing methods are summarized. At present, some static sealing requirements are urgent and difficult. For example, the deterioration of the sealing performance is an important factor which limits the service life of proton exchange membrane fuel cells and redox flow batteries. Therefore, a new method of static sealing whose sealing materials are rubber elastomers is proposed, named alterable static sealing. Then, its sealing processes are proposed. Furthermore, the actual contact area ratio r is used as the standard for sealability. Based on the mathematical model of pre-compressing static sealing, the influence of interface bonding was considered, and the mathematical model of alterable static sealing was established. Moreover, the compensatory effect of alterable static sealing on the static sealing capacity of rubber elastomers was proved.
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Xu, Honglin, and Bin Yang. "A Quantitative Model to Calculate Gas Sealing Capacity and Design Sealing Parameters for Premium Connection." Mathematical Problems in Engineering 2020 (February 24, 2020): 1–7. http://dx.doi.org/10.1155/2020/9074381.
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The present research studies about sealability of premium connection almost focus on qualitative description by sealing contact stress distribution, which is not convenient for sealing capacity evaluation and sealing parameter design. This paper proposes a quantitative model to calculate directly gas sealing capacity of cone to cone premium connection, different from the usual finite element method with testing, which combines the elastic thick wall cylinder interference fit theory for calculating sealing stress with the gas sealing criterion obtained from Murtagian’s experimental results. With the proposed model, the effects of pipe wall thickness, seal cone taper, radial sealing interference, and axial sealing length on the gas sealing capacity have been investigated. Furthermore, the gas sealing capacity envelope curve based on radial sealing interference and axial sealing length is also calculated and a new sealing parameter design method is proposed for cone to cone premium connection. The results show that the internal upset pipe is good for sealability, and increasing both radial sealing interference and axial sealing length can significantly enhance gas sealability while seal cone taper has an unobvious effect on it. To meet sealing capacity, the designed sealing parameter combination (δd, Ld) should be located in the upper right region of the gas sealing capacity envelope curve.
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Lukinskii, O. A. "“Breathing” sealing." Polymer Science. Series D 2, no. 3 (July 2009): 191–94. http://dx.doi.org/10.1134/s1995421209030150.
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Heikkinen, Kevin A. "Sealing assembly." Journal of the Acoustical Society of America 86, no. 6 (December 1989): 2476. http://dx.doi.org/10.1121/1.398394.
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