Log in

Relevant bibliographies by topics / Lead seal / Journal articles

To see the other types of publications on this topic, follow the link: Lead seal.

Journal articles on the topic 'Lead seal'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Lead seal.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Musin, A. "Small lead seals from Drochiczyn and small lead seals of “Drochiczyn type”: new light on the research on medieval “seal tags” in East-Central Europe." Archaeological News 31 (2021): 290–318. http://dx.doi.org/10.31600/1817-6976-2021-31-290-318.

Full text

Abstract:

The article argues the commercial and fiscal nature of medieval small lead seals. For the first time, seal tags of the Piast dynasty are attested. Their symbols correlated with Polish Hohlpfennigs. The concentration of Rus’ and Polish seals on the border may indicate its dual jurisdiction. The practice of European small lead seals is regarded as transfers of the Byzantine tradition.

APA, Harvard, Vancouver, ISO, and other styles

2

Mathieu, Barry, and Abhijit Dasgupta. "A Fractional-Factorial Numerical Technique for Stress Analysis of Glass-To-Metal Lead Seals." Journal of Electronic Packaging 116, no. 2 (1994): 98–104. http://dx.doi.org/10.1115/1.2905512.

Full text

Abstract:

Fracture of glass seals in metallic hermetic electronic packaging is a significant failure mode because it may lead to moisture ingress and also to loss of load carrying capacity of the glass seal. Seal glasses are intrinsically brittle and their fracture is governed by the stresses generated. This study investigates stresses in lead seals caused by handling, testing, mechanical vibration, and thermal excursions. Loads considered are axial tension, bending, and twisting of the lead. More general loading can be handled by superposition of these results. Factorial techniques, commonly used in mu

APA, Harvard, Vancouver, ISO, and other styles

3

Xia, Rong, Yunjie Zhou, Hong Zhou, Jianjun Yuan, Shuaiqi Gao, and Chunhua Fang. "Simulation research on lead seal defect of cable terminal based on ultrasonic testing technology." Journal of Physics: Conference Series 2932, no. 1 (2025): 012032. https://doi.org/10.1088/1742-6596/2932/1/012032.

Full text

Abstract:

Abstract As a key component of the cable terminal attachment, the lead seal may be loosened or ruptured due to fabrication process defects or external forces, so it is especially necessary to research detecting the defects in the lead seal by ultrasonic phased array technology. A simulation analysis of the seals was carried out through simulation methods. The results show that the defective echoes received by the probe can accurately identify the defects in the seals and their specific locations. The 10MHz frequency detects the internal defects of the seals, and the 7.5MHz frequency detects th

APA, Harvard, Vancouver, ISO, and other styles

4

Liu, Chunrui, Lidong He, Xingyun Jia, Haozhe Zhu, Tao Chen, and Wenhao Wang. "Effect of Installation Error on Rotary Seal of Aero Engine." Aerospace 9, no. 12 (2022): 820. http://dx.doi.org/10.3390/aerospace9120820.

Full text

Abstract:

The rotary seal is a key component of the aero engine. Under actual working conditions, most rotary seals always operate in an eccentric state (caused by installation errors), and when a large eccentricity occurs, it may lead to a large amount of gas leakage, resulting in a decrease in aero engine efficiency, which ultimately affects the reliability and life of the aero engine. Therefore, the effect of installation error on the rotary seal of the aero engine was studied in this research. The flow field numerical models of the honeycomb seal, labyrinth seal, and hybrid labyrinth–honeycomb seal

APA, Harvard, Vancouver, ISO, and other styles

5

Natalia, Khamaiko. "Seals of the Princess Maria." Stratum plus, no. 6 (December 15, 2015): 231–44. https://doi.org/10.5281/zenodo.5703148.

Full text

Abstract:

The subject of this paper is the attribution of the Old Russian female lead seals with the name of Maria. The new discovery of Princess Maria’s seal (Type 116) in the stratigraphically closed context of the last quarter of the 11th century redefines the previous attribution of the type, and forces to identify the owner of the seal as Grand Duchess of Kiev of 1078—1093 — the second wife of Vsevolod Yaroslavich. The emergence of the “archontissa” Maria nun’s seal (Type 23) is caused by Vsevolod Yaroslavich widow’s vows to the St. Andrew monastery (1093&m

APA, Harvard, Vancouver, ISO, and other styles

6

Mikkelsen, Bjarni. "A note on the harbour seal (Phoca vitulina) in the Faroe Islands." NAMMCO Scientific Publications 8 (September 1, 2010): 143. http://dx.doi.org/10.7557/3.2681.

Full text

Abstract:

The harbour seal was exterminated as a breeding species in the Faroe Islands in the mid-19th Century. Historical sources document that the harbour seal used to be a common inhabitant of the sheltered fjords where breeding occurred. It was reported to be more common than the grey seal, the other pinniped specie resident around the Faroes. But the number of harbour seals seemingly decreased as human settlements and other anthropogenic activities increased. Seal hunting was apparently already introduced by the Norse that arrived on the islands in the 7th century, a hunt that finally lead to the e

APA, Harvard, Vancouver, ISO, and other styles

7

ELAM, Nilgun, Christos MALATRAS, and Yavuz Selim GÜLER. "Pera Müzesi’ndeki Bizans Kurşun Mühürleri." Gephyra, no. 26 (October 8, 2023): 197–217. http://dx.doi.org/10.37095/gephyra.1299257.

Full text

Abstract:

The collection of lead seals of the Pera Museum consists of 17 unpublished pieces, except for three lead seals (nos.1, 8, and 10) which are dated from the second half of the 7th century to the 13th century. Ten of the seventeen Byzantine lead seals of the Pera Museum collection mention the dignities and the offices of their owners. These offices range from the lower rank of a simple notary (no. 5) up to the highest office of the emperor himself (no. 9). There is only one seal related to the ecclesiastical administration, issued by a bishop (no. 2). Noteworthy are the seals of Georgios (no. 6),

APA, Harvard, Vancouver, ISO, and other styles

8

Kanev, Nikolay. "Byzantine Lead Seal of Constantine, Notarios and Abydikos from Bulgaria." Vestnik Volgogradskogo gosudarstvennogo universiteta. Serija 4. Istorija. Regionovedenie. Mezhdunarodnye otnoshenija, no. 6 (January 2020): 90–94. http://dx.doi.org/10.15688/jvolsu4.2019.6.7.

Full text

Abstract:

Introduction. The paper deals with a byzantine lead seal of Constantine, notarios and abydikos, which originated from the vicinity of the medieval fortress of Rusokastro, southeastern Bulgaria. Methods. A part of byzantine lead seals are a primary source of information regarding both the commercial and economic activity in the Byzantine Empire and the administrative structures and mechanisms for its control and management, in particular for the period of the 8th – 9 th centuries. Therefore, the appearance of any such new scrambling monument is of great importance and the information derived fr

APA, Harvard, Vancouver, ISO, and other styles

9

Gransberg, Douglas D. "Chip Seal Program Excellence in the United States." Transportation Research Record: Journal of the Transportation Research Board 1933, no. 1 (2005): 72–82. http://dx.doi.org/10.1177/0361198105193300109.

Full text

Abstract:

A survey of U.S. public highway and road agencies that use chip seals as a part of their roadway maintenance program was developed and conducted to identify best practices in chip seal design and construction. A total of 72 individual responses from 42 U.S. states and 12 U.S. cities and counties were received; of those, nine respondents reported that they were getting excellent results from their chip seal programs. Those responses were grouped together and analyzed by the case study method to identify trends that lead to consistently excellent chip seal results. The study found that the succe

APA, Harvard, Vancouver, ISO, and other styles

10

Lu, Bin, Xiaojian Ma, Caiguang Wu, Haijun Xuan, and Weirong Hong. "The Wear of Seal Fins during High-Speed Rub between Labyrinth Seal Fins and Honeycomb Stators at Different Incursion Rates." Materials 14, no. 4 (2021): 979. http://dx.doi.org/10.3390/ma14040979.

Full text

Abstract:

Labyrinth seals as a noncontact sealing technology are widely used in aero-engine. To improve the efficiency of the aero-engine, the clearance between the rotor and stator must be as small as possible. However, the change of the clearance between the rotor and stator because of thermal expansion, vibration, mechanical loading may lead to undesirable high-speed rub, which will lead to the cracking of the seal fins. This paper focuses on the wear of the seal fin after the rub and presents the rubbing tests between seal fins and the metal honeycomb under rubbing speed of 380 m/s and incursion rat

APA, Harvard, Vancouver, ISO, and other styles

11

Kanev, Nikolay. "New Lead Seal of Adrian Komnenos, Protosebastos and Megas Domestikos of the Entire West, Discovered in the Area of Rusokastro in Southeastern Bulgaria." Vestnik Volgogradskogo gosudarstvennogo universiteta. Serija 4. Istorija. Regionovedenie. Mezhdunarodnye otnoshenija 26, no. 6 (2021): 96–101. http://dx.doi.org/10.15688/jvolsu4.2021.6.7.

Full text

Abstract:

ntroduction. The present article is a primary publication of a newly discovered sphragistic artefact from the area of the medieval fortress of Rusokastro, which was acquired by the Regional Historical Museum in Burgas in 2019. Methods. In their entirety, the Byzantine lead seals are an important primary and reliable source of information on various aspects of Byzantine history. Byzantine seals are especially important from the perspective of prosopography. First of all, they are invaluable evidence of individuals who, in one way or another, participated in the social and political life of the

APA, Harvard, Vancouver, ISO, and other styles

12

Guo, An Nan, Xiao Jing Wang, Shen Gang, and Deng Feng Jiang. "Numerical Analysis of Annular Seal with Different Distribution of Surface Texture." Key Engineering Materials 642 (April 2015): 66–71. http://dx.doi.org/10.4028/www.scientific.net/kem.642.66.

Full text

Abstract:

Surface texturing has been shown to reduce friction and increase the film thickness in various tribological applications (hydrodynamic bearings, mechanical seals, and cylinder-liner contacts). Studies have reported that surface-texture can reduce the resistance of sliding friction pair, increase the oil film thickness, increase the bearing’s capacity. Surface texture structure’s design and layout are very important, unfavorable design may lead to be counterproductive. In this paper, in combination with the 650mm seal structure, we are using the main design of groove type to seal the inner surf

APA, Harvard, Vancouver, ISO, and other styles

13

Laflı, Ergün, and Jean-Claude Cheynet. "Late Byzantine sigillographic evidence from Cappadocia: lead seals from Kırşehir with a unique overstruck example." Byzantinische Zeitschrift 115, no. 1 (2022): 193–210. http://dx.doi.org/10.1515/bz-2022-0008.

Full text

Abstract:

Abstract This short essay presents four 11th century A.D. Byzantine lead seals, all of which are stored in the local museum of Kırşehir, in ancient Cappadocia, which is located today in southeastern part of central Turkey. The Museum of Kırşehir owns a minor collection of at least 13 Byzantine lead seals and a selection of four unpublished seals is being presented, which were sold to the museum by local antique dealers from the Turkish provinces of Kırşehir and Aksaray. All of the seals are dated to the late 10th and early or mid-11th centuries A.D. No. 1 is an overstruck seal with a parallel

APA, Harvard, Vancouver, ISO, and other styles

14

Nikas, G. K. "Analytical study of the extrusion of rectangular elastomeric seals for linear hydraulic actuators." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 217, no. 5 (2003): 365–73. http://dx.doi.org/10.1243/135065003322445287.

Full text

Abstract:

Rectangular elastomeric seals used on reciprocating piston rods in high-pressure hydraulic actuators often suffer from extrusion damage at the low-pressure side of the actuators. The extrusion takes place at the narrow clearance between the rod and the actuator, where the seal develops a ‘nip’ under conditions of high sealed pressure and/or high friction with the rod, which is amplified in the absence of a back-up ring. This form of strain can lead to permanent damage of the seal and impair the sealing performance of the system. This paper deals with the modelling of this kind of seal extrusio

APA, Harvard, Vancouver, ISO, and other styles

15

Laflı, Ergün, and Werner Seibt. "Seven Byzantine lead seals from the museum of Ödemiş in western Anatolia." Byzantine and Modern Greek Studies 44, no. 1 (2020): 21–39. http://dx.doi.org/10.1017/byz.2019.22.

Full text

Abstract:

This short essay presents seven Byzantine lead seals, all of which originate from the local museum in Ödemiş in the province of Izmir in western Turkey. Almost all of them came as acquisition to Ödemiş by local antique dealers. All the pieces have been treated and interpreted here sigillographically for the first time. This small collection of seals is important regarding the administration of the theme of Thrakesion, especially about the offices of the seal owners, and the society of Cayster valley during the Byzantine period.

APA, Harvard, Vancouver, ISO, and other styles

16

Dushenko, Anton. "The Lead Cloth Seals from Post-Byzantine Mangup." Materials in Archaeology, History and Ethnography of Tauria, no. XXVIII (December 26, 2023): 428–49. http://dx.doi.org/10.29039/2413-189x.2023.28.428-449.

Full text

Abstract:

The aim of this research is to introduce into the scholarship a new group of sigillographic materials, or the lead cloth seals. The collection of 23 artefacts was divided into two types according to their morphological characteristics. The cloth seals of type 1 consist of two lead discs, and the cloth seals of type 2 of four discs. Type 1 comprises of three variants. All the artefacts have been interpreted as cloth seals used as markers of provenance and quality standards in the European textile industry from the Middle Ages and the Modern Period. The cloth seals of type 1 seals originate from

APA, Harvard, Vancouver, ISO, and other styles

17

RAMADANSKI, RAŠKO. "A Tudor Lead Seal in Serbia." Post-Medieval Archaeology 48, no. 2 (2014): 426–38. http://dx.doi.org/10.1179/0079423614z.00000000064.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Castellini, M. A., and D. P. Costa. "Relationships between plasma ketones and fasting duration in neonatal elephant seals." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 259, no. 5 (1990): R1086—R1089. http://dx.doi.org/10.1152/ajpregu.1990.259.5.r1086.

Full text

Abstract:

Long-duration fasting in mammals can ultimately lead to stage three terminal starvation, which is characterized by depleted fat stores, a metabolic shift away from fat metabolism toward lean tissue catabolism, and a sharp decline in circulating levels of plasma fatty acids and ketone bodies. However, this biochemical shift has never been observed outside of the laboratory in a naturally fasting, nonhibernating mammal. In the current study, plasma levels of the ketone body D-beta-hydroxybutyrate (beta-HBA) were assayed in 10 Northern elephant seal pups during suckling and the postweaning fast a

APA, Harvard, Vancouver, ISO, and other styles

19

Omenife, Nonso, Dawood Desai, and Regan Dunne. "Analysis of Brush Seal Interaction with Steam Turbine Rotor-Shafts." Science, Engineering and Technology 4, no. 1 (2024): First. http://dx.doi.org/10.54327/set2024/v4.i1.108.

Full text

Abstract:

High-speed turbines are a major source for power production. They utilize high pressure and temperature fluid flow. Sealing of these machines to decrease the flow losses has been a major engineering challenge since the inception of steam turbines. From an engineering viewpoint, seals are used to introduce friction in the fluid flow path. This reduces the flow leakage. Improved seal performance offers substantial opportunities for turbine performance. Reduced leakages in steam turbines can lead to greater efficiency and power output. They can also allow tighter control of turbine secondary flow

APA, Harvard, Vancouver, ISO, and other styles

20

To̸nder, K. "Finely Striated Lip-Seal Surfaces: Part 1—General Effects." Journal of Tribology 115, no. 4 (1993): 620–24. http://dx.doi.org/10.1115/1.2921685.

Full text

Abstract:

The work presented previously by To̸nder and Salant (1992) is extended and generalized. In that work it was shown that the fine, axially oriented striations found on some lip-seals, under certain conditions, could lead to the total suppression of leakage through a fully lubricated seal. In the present work the behavior of the lubricant annulus is studied, as are the conditions required for leakage suppression. If the latter are met, it is shown that when a certain parameter—here called the seal number—is increased, the lubricant annulus width will shrink. This will lead to a reduction of the f

APA, Harvard, Vancouver, ISO, and other styles

21

Lovrec, Darko, and Vito Tič. "Suitability of Test Procedures for Determining the Compatibility of Seal Materials with Ionic Hydraulic Fluids." Polymers 16, no. 18 (2024): 2551. http://dx.doi.org/10.3390/polym16182551.

Full text

Abstract:

The compatibility of seal materials with the working fluid is crucial for the flawless, energy-saving, environmentally sustainable, and safe operation of any technical system. This is especially true for hydraulic systems operating under high operating pressure. The problem of materials compatibility comes into play when either a new type of seal material or a new type of fluid comes into use. The paper discusses the research findings regarding material compatibility testing of new high-tech ionic hydraulic fluids with commonly used seal materials. Due to the completely different chemical comp

APA, Harvard, Vancouver, ISO, and other styles

22

Cherry, John. "The Cloth Seal: A Mark of Quality, Identification, or Taxation?" Medieval Globe 4, no. 1 (2018): 167–92. http://dx.doi.org/10.17302/tmg.4-1.7.

Full text

Abstract:

This survey explores the origins of the lead cloth seal and its use in the primary production process of cloth making, secondary processes such as dyeing, and widespread application in the taxation and the regulation of trade. It concentrates especially on the discovery, study, and historiography of cloth seals in England and France, and explores how the study of such seals provides evidence for manufacturing and commerce in the medieval and post-medieval worlds.

APA, Harvard, Vancouver, ISO, and other styles

23

Kwanka, K. "Improving the Stability of Labyrinth Gas Seals." Journal of Engineering for Gas Turbines and Power 123, no. 2 (1997): 383–87. http://dx.doi.org/10.1115/1.1359772.

Full text

Abstract:

The flow through labyrinth seals of turbomachinery generates forces which can cause self-excited vibrations of the rotor above the stability limit. The stability limit is reached at a specific rotating speed or power. The continuous growth of power density and rotating speed necessitates an exact prediction of the stability limit of turbomachinery. Usually the seal forces are described with dynamic coefficients. A new, easy-to-handle identification procedure uses the stability behavior of a flexible rotor to determine the dynamic coefficients. Systematic measurements with a great number of lab

APA, Harvard, Vancouver, ISO, and other styles

24

Bai, Shaoxian, Yangyang Chen, and Jing Yang. "Analysis of Thermoelastic Contact of Gas-Lubricated Rough Sealing Faces." Materials 17, no. 14 (2024): 3600. http://dx.doi.org/10.3390/ma17143600.

Full text

Abstract:

Friction and wear are the main failure sources of face seals. When the surfaces of sealing rings exhibit greater roughness, the level of friction might increase and lead to sealing failure. Therefore, in this paper, based on the elastic contact hypothesis of rough and wavy surfaces and the influence of temperature on the elastic modulus of materials, a thermoelastic contact lubrication model of a gas-lubricated end seal is established. The novelty and advantage of this study is that it takes the effect of surface roughness into consideration during thermoelastic analysis of gas-lubricated seal

APA, Harvard, Vancouver, ISO, and other styles

25

Жинов, Andrey A., and Denis V. Shevelev. "Determination of steam leaks through faulty labyrinth seals of a steam turbine." Izvestiya MGTU MAMI 16, no. 1 (2022): 21–28. http://dx.doi.org/10.17816/2074-0530-104581.

Full text

Abstract:

BACKGROUND: When calculating the axial force acting on the thrust bearing of a steam turbine, when calculating the dimensions of the unloading piston, when calculating the efficiency of the turbine stages, it is necessary to determine the amount of steam leakage through its diaphragm and end seals. Existing methods make it possible to calculate leaks only through serviceable, undamaged labyrinth seals of several standard designs. However, during the operation of steam turbines, due to off-design axial and radial displacements of the rotor, labyrinth seals are often damaged - deformed, crushed

APA, Harvard, Vancouver, ISO, and other styles

26

Robinson, Bobby M. "Seal the Deal." Industrial Vehicle Technology International 26, no. 3 (2018): 93. http://dx.doi.org/10.12968/s1471-115x(23)70251-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Oyarçin, Kasım, and Ersin Çelikbaş. "A Byzantine Lead Seal from Paphlagonian Hadrianopolis." Art-Sanat, no. 20 (August 1, 2023): 469–84. http://dx.doi.org/10.26650/artsanat.2023.20.1289749.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Liu, Yan, Jie Long Ren, and Hui Cao. "Reform of Mechanical Shaft Sealing Self-Flush System of Petrochemical Hot Oil Centrifugal Pump." Applied Mechanics and Materials 331 (July 2013): 106–9. http://dx.doi.org/10.4028/www.scientific.net/amm.331.106.

Full text

Abstract:

Mechanical seal leakage of centrifugal pumps (especially hot oil pumps) is the main fault reason of the petrochemical equipments. The fuction of the sealing flush system is to maintain the mechanical shaft seal function correctly. The misconduct of flush system settings will directly lead to the failure of mechanical seal. In this paper, the problems are analyzed for the present mechanical seal flushing system. When the centrifugal pump is in a standby state, flushing system may not provide normal flush flow in self-flush plan. This may lead to surface fouling of the hot mechanical shaft seal,

APA, Harvard, Vancouver, ISO, and other styles

29

Zhang, Fu Ying, Hong Chao Zhang, and Hui Zheng. "Efficiency-Reinforcement Design Study for Elastomeric Hydraulic Reciprocating Seal Based on Function Analysis." Materials Science Forum 697-698 (September 2011): 646–49. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.646.

Full text

Abstract:

The efficiency-reinforcement design framework for hydraulic reciprocating seal is proposed, and the function attributes analysis model for reciprocating seal system is built. Through analyzing the components, functions and attributes of elastomeric hydraulic reciprocating seal system, the attributes that influence seal efficiency-reinforcement are identified. By eliminating the function attributes that lead to seal leakage and seal failure, and/or by improving the function attributes that are insufficient in seal, the efficiency-reinforcement design concept can be obtained. A new seal efficien

APA, Harvard, Vancouver, ISO, and other styles

30

He, Wentao, Shaoping Wang, Chao Zhang, Xi Wang, and Di Liu. "Lubrication and Wear Characteristics of Mechanical Face Seals under Random Vibration Loading." Materials 13, no. 6 (2020): 1285. http://dx.doi.org/10.3390/ma13061285.

Full text

Abstract:

The service life of mechanical face seals is related to the lubrication and wear characteristics. The stable analytical methods are commonly used, but they cannot address effects of random vibration loading, which, according to experimental studies, are important factors for lubrication and wear of mechanical face seals used in air and space vehicles. Hence, a dynamic model for mechanical face seals is proposed, with a focus on the effects of random vibration loading. The mechanical face seal in the axial direction is described as a mass-spring-damping system. Spectrum analysis specified for r

APA, Harvard, Vancouver, ISO, and other styles

31

Kuhn, C. E., R. R. Ream, J. T. Sterling, J. R. Thomason, and R. G. Towell. "Spatial segregation and the influence of habitat on the foraging behavior of northern fur seals (Callorhinus ursinus)." Canadian Journal of Zoology 92, no. 10 (2014): 861–73. http://dx.doi.org/10.1139/cjz-2014-0087.

Full text

Abstract:

Central place foraging by colonial breeders can lead to depleted prey resources around breeding areas. Segregation of foraging areas both within and between large colonies may act as a mechanism to reduce competition for prey resulting in increased foraging success. We reassessed horizontal (spatial) foraging habitat segregation for northern fur seals (Callorhinus ursinus (L., 1758)) within and between colonies on the Pribilof Islands, Alaska (St. Paul and St. George islands), after the population declined by approximately 40%. Additionally, we examined vertical habitat segregation, where fora

APA, Harvard, Vancouver, ISO, and other styles

32

Trulev, A. V., and S. F. Timushev. "A New Generation of Submersible Electrical Motor Protectors with a Dynamic Labyrinth for Operation in Aggressive Environment with High Concentration of Free Gas and Solids." Proceedings of Higher Educational Institutions. Маchine Building, no. 7 (712) (July 2019): 59–65. http://dx.doi.org/10.18698/0536-1044-2019-7-59-65.

Full text

Abstract:

In this work, the authors study the problems associated with the operation of oil wells using electric centrifugal pumps. The authors acknowledge the negative factors that lead to an increase in solids concentration in the upper part of the submersible electric motor protectors, higher possibility of end seal failures and shortening of service life of serial products. The replacement of a gravitational labyrinth by a dynamic one in the upper part of the motor seal protector is one of the ways to improve the reliability of the protector in the operational environment with high concentration of

APA, Harvard, Vancouver, ISO, and other styles

33

Cheng, Qian, Yinshui Liu, Zhenyao Wang, Defa Wu, and Yunxiang Ma. "Dynamic failure analysis of static seals under pressure fluctuation in an ultrahigh-pressure water piston pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 236, no. 8 (2021): 3950–59. http://dx.doi.org/10.1177/09544062211052024.

Full text

Abstract:

For ultrahigh-pressure piston pumps, in the reciprocating action of the piston, the fretting between the static face seal and the mating surface occurs with the change of the pressure in the piston chamber. This phenomenon will seriously affect the service life of the seal ring and lead to the failure of the pump. However, the failure of static seals used to seal ultrahigh-pressures is usually studied from the directions of shear, stress, or rubber material. These studies cannot explain the failure phenomenon of the sealing ring found in our experiment. This paper analyzed the failure of the f

APA, Harvard, Vancouver, ISO, and other styles

34

Ivanisevic, Vujadin, and Bojana Krsmanovic. "New Byzantine seals from Morava (Margum) and Branicevo." Starinar, no. 68 (2018): 111–24. http://dx.doi.org/10.2298/sta1868111i.

Full text

Abstract:

The authors present new finds of Byzantine lead seals at Morava (Margum), Branicevo and the broader area around them. The seals from Morava and Branicevo were unearthed in the course of archaeological excavations, which make these finds particularly important. Significant among them is the seal from Morava, which belonged to Symeon (?), magister and logothete of the dromos, from the end of the tenth century, which indicates the presence of Byzantine officials in Morava and the establishment of Byzantine authority along the north-western Danubian border following the fall of the Bulgarian empir

APA, Harvard, Vancouver, ISO, and other styles

35

Stevens, Karl K., Tin-Lup Wong, Ajit Renavikar, and Wayne Chen. "Fracture of Glass Seals in Surface Mount IC Packages." Journal of Electronic Packaging 112, no. 2 (1990): 162–67. http://dx.doi.org/10.1115/1.2904357.

Full text

Abstract:

Results of a study to investigate the cracking of glass seals in a surface-mount integrated circuit package with ceramic covers are presented. Finite element analyses were combined with principles of fracture mechanics to estimate values of lead tip displacement (or applied force) at the onset of seal cracking. Such cracking provides points of entry for moisture, and otherwise degrades package reliability. Limiting values of lead tip displacement were estimated by three different approaches. The results obtained were in close agreement, and appear to be consistent with physical observations.

APA, Harvard, Vancouver, ISO, and other styles

36

Wen, Jing, Xi Lu, and Xiang Fu. "Reliability Analysis of Y-Ring Rod Seal on the Servo Turret." Applied Mechanics and Materials 685 (October 2014): 212–16. http://dx.doi.org/10.4028/www.scientific.net/amm.685.212.

Full text

Abstract:

From the perspective of stress and heat distribution, the influence of material and heat on working reliability of the turret seal is analysed. Based on the actual working condition of a servo turret, the FEA (finite element analysis) of structural mechanics and thermal structural coupling is carried out on the key reciprocating seal between piston and oil cylinder. The analysis re that material hardness and temperature have great influence on the seal contact pressure and the leakage. To be specific, the lower seal material hardness leads to the lower maximum contact stress and longer seal’s

APA, Harvard, Vancouver, ISO, and other styles

37

Wickens, P. A., P. A. Shelton, J. H. M. David, et al. "A Fur Seal Simulation Model to Explore Alternative Management Strategies." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 7 (1992): 1396–405. http://dx.doi.org/10.1139/f92-155.

Full text

Abstract:

A simulation model is formulated for the South African fur seal (Arctocephalus pusillus pusillus) to evaluate the appropriate management action when culling to reduce population growth rate, culling to decrease fish consumption by seals, or harvesting to maximise numbers of seals removed. There is disturbance associated with bull sealing which increases pup mortality and reduces pregnancy rates, but this is not well quantified. Disturbance can be included or excluded from model runs. To reduce population growth, cow removal is most effective, but the population sex ratio becomes severely alter

APA, Harvard, Vancouver, ISO, and other styles

38

Wang, Qiang, Ya-Ping Hu, and Hong-Hu Ji. "Leakage, heat transfer and thermal deformation analysis method for contacting finger seals based on coupled porous media and real structure models." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 10 (2020): 2077–93. http://dx.doi.org/10.1177/0954406219900219.

Full text

Abstract:

Finger seal is a type of compliant seal configuration that has superior sealing performance compared with conventional labyrinth seals and brush seals. However, complex working conditions lead to leakage, thermal gradient and deformation, which can be more serious for a contacting finger seal due to frictional heating. In this paper, a leakage and thermal performance analysis method coupled with porous media and a real structure model was developed to numerically simulate the leakage, heat transfer and thermal deformation characteristics of a contacting finger seal. The method innovatively est

APA, Harvard, Vancouver, ISO, and other styles

39

Bolotov, Alexander, and Georgy Burdo. "Magnetic fluid method for sealing liquid media." E3S Web of Conferences 383 (2023): 04081. http://dx.doi.org/10.1051/e3sconf/202338304081.

Full text

Abstract:

Magnetic fluid seals for sealing gas environments are widely used in various industries due to their undeniable advantages. However, such seals are not capable of reliable sealing of liquid media with different polarities. The paper analyses physicochemical processes that lead to destructing magnetic fluid in a seal under the influence of a liquid medium in contact with it. There are results of experimental studies on sealing using magnetic seals of non-magnetic fluids with different polarity. The authors studied the tightness of a magnetic fluid seal capacity in contact with weakly polar liqu

APA, Harvard, Vancouver, ISO, and other styles

40

Chen, Junjie, Chunhong Ma, Shaoxian Bai, and Jing Yang. "Vaporization Phase Transition in Cryogenic Liquid Oxygen Sealing Film on Spiral Groove Faces." Materials 17, no. 6 (2024): 1443. http://dx.doi.org/10.3390/ma17061443.

Full text

Abstract:

The property of vaporization phase transition in liquid oxygen face seals is a key factor affecting the stability of mechanical face seals in many fields, especially under cryogenic conditions. Here, a numerical model based on the saturated vapor pressure is established to investigate the vaporization phase transition property of liquid oxygen sealing film. The novelty of this model is to take the influence of heat transfer and face distortions into consideration at the same time. The pressure and temperature distributions as well as face distortions are calculated, and then the property of va

APA, Harvard, Vancouver, ISO, and other styles

41

Vesevska, Irena Teodora. "A rare Βyzantine lead seal from medieval Βučin". Годишен зборник на Филозофскиот факултет/The Annual of the Faculty of Philosophy in Skopje 74 (2021): 183–94. http://dx.doi.org/10.37510/godzbo2174183v.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Chkhaidze, Victor N. "Seal of Michael Opos, the Katepano of Iberia (1020s), from Taman." Античная древность и средние века 52 (2024): 207–19. https://doi.org/10.15826/adsv.2024.52.012.

Full text

Abstract:

So far, the excavations at the site of the ancient town of Taman (mediaeval Tamatarcha, or Matarcha) discovered a group of lead seals of the persons from 20 plus noble Byzantine families living in the eleventh and twelfth century. Among them there are the members of the Doukai, Komnenoi, Palaiologoi, Angeloi, Kastamonitai, Brachamioi, and others. Additionally, some of these seals uncover stable connections between eleventh-century Taman with the imperial themes, particularly in the Transcaucasia. This way, the previous finds of the seals at the ancient town of Taman include the pieces from the

APA, Harvard, Vancouver, ISO, and other styles

43

Xu, Yiren, Ting Ma, Lingcheng Kong, Juying Zhao, and Yongjian Li. "Wear and Leakage Behaviors of Brush Seal Considering Eccentricity and Radial Deformation." Energies 16, no. 8 (2023): 3394. http://dx.doi.org/10.3390/en16083394.

Full text

Abstract:

Brush seals can improve engine performance by reducing leakage. Wear models of brush seals provide methods to predict wear and leakage. However, rotor eccentricity, radial deformation, and hysteresis effect of bristles are not considered systematically in the existing models, which may lead to large errors in some cases. To investigate the influence of rotor-stator eccentricity and radial deformation on the wear process and leakage performance of brush seal, a brush seal test was planned and executed, in which the air leakage rates were measured at different testing times and operating conditi

APA, Harvard, Vancouver, ISO, and other styles

44

Zhou, Lusheng, Xiaofang Wang, Haitao Liu, and Jianchi Xin. "The Effect of Inflow Distortion on the Rotordynamic Characteristics of a 1400-MW Reactor Coolant Pump Annular Seal." Machines 10, no. 1 (2022): 65. http://dx.doi.org/10.3390/machines10010065.

Full text

Abstract:

The annular seal between stator and rotor substantively acts as a bearing that affects the rotordynamic characteristic of the turbomachinery rotor system. The rotor wake turbulence in a canned motor Reactor Coolant Pump (RCP) will lead to inflow pressure distortion at the annular seal entrance, thus further affecting the seal rotordynamic characteristics and threatening the stable operation of RCP. In order to obtain the seal rotordynamic coefficients, a transient numerical method applies the mesh deformation technique to simulate the multiple-frequency elliptical rotor whirling orbit model. T

APA, Harvard, Vancouver, ISO, and other styles

45

Elizabeth and Mark Forrest. "Impressed in Metal: the Seals of a Devon Tax Collector." Antiquaries Journal 85 (September 2005): 366–73. http://dx.doi.org/10.1017/s0003581500074436.

Full text

Abstract:

With the exception of papal bullae and royal golden seals, metal seals were very rare in northern Europe in the Middle Ages and early modern period. This paper explores a rare example of the use of lead as a medium into which to impress a seal, something that is not only of considerable interest in the context of medieval sigillography, but which provides an insight into the concerns and motives of an individual who in other circumstances would have remained an anonymous member of the Elizabethan gentry and county bureaucracy.

APA, Harvard, Vancouver, ISO, and other styles

46

Cardona, Sebastian, Lesli Wood, Lorena Moscardelli, and Dallas Dunlap. "Cannibalization and sealing of deepwater reservoirs by mass-transport complexes — The Jubilee field, Gulf of Mexico." Interpretation 8, no. 4 (2020): SV17—SV30. http://dx.doi.org/10.1190/int-2019-0274.1.

Full text

Abstract:

Mass-transport complexes (MTCs) are important stratigraphic elements in many deepwater basins. In hydrocarbon exploration, MTCs have traditionally been identified as seals although they can also act as migration pathways or cannibalize and compartmentalize adjacent reservoirs. Although the ever-improving resolution of seismic data has enhanced the knowledge about these deposits (e.g., geometry, distribution), at present the potential of MTCs to act as top and/or lateral seals is difficult to predict predrilling and few case studies are publicly available. The key objective here is to present e

APA, Harvard, Vancouver, ISO, and other styles

47

Kong, Xiaozhi, Gaowen Liu, Yuxin Liu, Zhao Lei, and Longxi Zheng. "Performance evaluation of the inter-stage labyrinth seal for different tooth positions in an axial compressor." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 6 (2017): 579–92. http://dx.doi.org/10.1177/0957650917739532.

Full text

Abstract:

Labyrinth seals are normally used to control the leakage flow in the compressor stator well. The upstream and downstream rotor-stator cavities of the labyrinth seal can cause complex reverse leakage flows. Remarkable temperature increases and high swirl velocities are observed in this region. In addition, another characteristic of inter-stage labyrinth seal is that large expansions of rotor and stator may easily lead to severely rubbing between the teeth and shrouds, which can shorten the lifetime of the compressor obviously. Experiments were conducted at a rotating compressor inter-stage seal

APA, Harvard, Vancouver, ISO, and other styles

48

Shao, Qianqiu, Songhai Fan, and Fenglian Liu. "Depth Evaluation of Subsurface Defects in Lead Seal Based on Accumulated Value Feature from Pulsed Eddy Current Signals." Materials Evaluation 82, no. 6 (2024): 41–48. http://dx.doi.org/10.32548/2024.me-04401.

Full text

Abstract:

The lead seal is one of the piezoelectric cable components that is prone to failure. In this paper, the accumulated value of pulsed eddy current signals was utilized to characterize the subsurface defect depth of the lead seal for the safety of the lead seal in service. The characterization method of the defect depth was analyzed by the finite element model. The simulation results showed that the accumulated value feature had a linear relationship with the subsurface defect depth in a semilogarithmic coordinate system, and the linear fitting coefficient was 0.9982. The experimental results sho

APA, Harvard, Vancouver, ISO, and other styles

49

Mikkelsen, Lonnie, Line Hermannsen, Kristian Beedholm, Peter Teglberg Madsen, and Jakob Tougaard. "Simulated seal scarer sounds scare porpoises, but not seals: species-specific responses to 12 kHz deterrence sounds." Royal Society Open Science 4, no. 7 (2017): 170286. http://dx.doi.org/10.1098/rsos.170286.

Full text

Abstract:

Acoustic harassment devices (AHD) or ‘seal scarers’ are used extensively, not only to deter seals from fisheries, but also as mitigation tools to deter marine mammals from potentially harmful sound sources, such as offshore pile driving. To test the effectiveness of AHDs, we conducted two studies with similar experimental set-ups on two key species: harbour porpoises and harbour seals. We exposed animals to 500 ms tone bursts at 12 kHz simulating that of an AHD (Lofitech), but with reduced output levels (source peak-to-peak level of 165 dB re 1 µPa). Animals were localized with a theodolite be

APA, Harvard, Vancouver, ISO, and other styles

50

Zhang, Yi, Sipeng Zhong, Siyang Xiong, and Zijie Xiong. "Study on lubrication characteristics of rotary combination seals under stress relaxation." Engineering Research Express 5, no. 2 (2023): 025074. http://dx.doi.org/10.1088/2631-8695/acddb8.

Full text

Abstract:

Abstract Temperatures in the drilling environment can reach 150 °C and pressures up to 30 MPa, all of which can cause oil film rupture and even seal failure. In addition, under high pressure, viscosity changes can lead to stress relaxation, which may eventually cause seal failure as well. In order to study the influence of high temperature and high pressure conditions on seal performance during stress relaxation, the pressure permeation loading method on both sides is used in the finite element model to simulate the fluid pressure on both sides of the seal interface, and the TEHL (thermo-elast

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!