Log in

Relevant bibliographies by topics / Support-seals / Journal articles

To see the other types of publications on this topic, follow the link: Support-seals.

Journal articles on the topic 'Support-seals'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 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 'Support-seals.'

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

Osinga, Nynke, and Pieter ‘t Hart. "Harbour seals (Phoca vitulina) and rehabilitation." NAMMCO Scientific Publications 8 (September 1, 2010): 355. http://dx.doi.org/10.7557/3.2699.

Full text

Abstract:

Throughout the past few decades, rehabilitation of seals has become an activity that is anchored in the present day society of many countries. Seals are primarily rehabilitated to help individual animals in distress. At the same time, the release of seals which would have otherwise died can be considered as a contribution to the population. Most rehabilitated seals are animals under one year of age. They are mainly orphans, weaned seals with complications and seals with a parasiticbronchopneumonia. For the optimal handling of seals and their diseases, centralised operations with quality standa

APA, Harvard, Vancouver, ISO, and other styles

2

Zhai, Lulu, Zhang Zhenjie, Chi Zhonghuang, and Guo Jia. "Dynamic analysis of liquid annular seals with herringbone grooves on the rotor based on the perturbation method." Royal Society Open Science 5, no. 6 (2018): 180101. http://dx.doi.org/10.1098/rsos.180101.

Full text

Abstract:

Annular seals have significant effects on the hydraulic and rotordynamic performances of turbomachinery. In this paper, an analysis method for calculating the leakage flow rates and dynamic characteristics of liquid annular seals with herringbone grooves on the rotor is proposed and verified. Leakage flow rates and dynamic characteristics of the model seals under different operating conditions are theoretically analysed and compared with those of plain and spiral-grooved seals of the same size. In addition, the influence of geometric parameters such as spiral angle and the lengths of the const

APA, Harvard, Vancouver, ISO, and other styles

3

Bester, Marthán N., Albert W. Erickson, and J. Willem H. Ferguson. "Seasonal change in the distribution and density of seals in the pack ice off Princess Martha Coast, Antarctica." Antarctic Science 7, no. 4 (1995): 357–64. http://dx.doi.org/10.1017/s0954102095000502.

Full text

Abstract:

During the period 9 December 1991–4 February 1992 shipboard and aerial surveys of seals in the pack ice off the Princess Martha Coast were made. All aerial surveys were flown from the MV SA Agulhas at the edge of the fast ice opposite SANAE at 70°19′S, 02°26′W. A total of 18 1/2-nm-wide transects were flown censusing 481.3 nm2 of pack ice within which 1437 seals were counted. The species composition of the seals was 94.4% crabeater, 3.4% Ross, 1.4% leopard and 0.8% Weddell seals. The density of seals nm−2 for the early season surveys (December) in the inner pack was 1.92 for crabeater, 0.0 for

APA, Harvard, Vancouver, ISO, and other styles

4

Liu, Dongjiao, Peijun Zhang, Yamian Wang, Zhichuang Lu, Wanxin Deng, and Songhai Li. "Hybrids Between Gray Seals (Halichoerus grypus) and Spotted Seals (Phoca largha): A Case of Xeno-Breeding Preference in Pinnipeds." Aquatic Mammals 49, no. 6 (2023): 550–60. http://dx.doi.org/10.1578/am.49.6.2023.550.

Full text

Abstract:

Generally, a species is defined as an independent unit that is reproductively isolated from others. However, deviations from this definition are not uncommon. For example, cross-fertilization in pinnipeds has been reported among at least 10 species. Herein, we describe an unexpected hybridization that occurred between female gray seals (Halichoerus grypus) and male spotted seals (Phoca largha) in the presence of adult male gray seals in a mixed-species seal population under human care. To our knowledge, these are the first cases of gray and spotted seal hybrids ever reported. The three hybridi

APA, Harvard, Vancouver, ISO, and other styles

5

Stirling, Ian, and Nils Are Øritsland. "Relationships between estimates of ringed seal (Phoca hispida) and polar bear (Ursus maritimus) populations in the Canadian Arctic." Canadian Journal of Fisheries and Aquatic Sciences 52, no. 12 (1995): 2594–612. http://dx.doi.org/10.1139/f95-849.

Full text

Abstract:

Analysis of estimates of population size of ringed s,eals (Phoca hispida) and polar bears (Ursus maritimus) from several areas indicated that estimates of one predicted the range of expected population size of the other in areas where ringed seals constitute the primary prey. In some areas, the closeness of this relationship indicates where estimates of either seals or bears may be inaccurate. The number of seals required to support a population of polar bears of predetermined size was estimated independently using both behavioral and energetic data. Behavioral estimates of the number of seals

APA, Harvard, Vancouver, ISO, and other styles

6

Kaneko, S., H. Kamei, Y. Yanagisawa, and H. Kawahara. "Experimental Study on Static and Dynamic Characteristics of Annular Plain Seals With Porous Materials." Journal of Tribology 120, no. 2 (1998): 165–72. http://dx.doi.org/10.1115/1.2834404.

Full text

Abstract:

Static and dynamic characteristics are experimentally investigated for annular plain seals with porous materials applied to the seal surface by insertion into the middle of the seal. Experimental results show that annular plain seals with porous materials have a higher leakage flow rate, larger main stiffness coefficients, and smaller cross-coupled stiffness coefficients and main damping coefficients than conventional annular plain seals with solid surfaces. In the porous seals, an increase of approximately 30 percent in the leakage flow rate and reduction of the same amount in the main dampin

APA, Harvard, Vancouver, ISO, and other styles

7

Li, Ruizhu, Yue Lu, Yutian Yu, et al. "Investigation on Long-Term Stability of Vermiculite Seals for Reversible Solid Oxide Cell." Molecules 28, no. 3 (2023): 1462. http://dx.doi.org/10.3390/molecules28031462.

Full text

Abstract:

A reversible solid oxide cell (RSOC) integrating solid oxide fuel (SOFC) and a solid oxide electrolysis cell (SOEC) usually utilizes compressive seals. In this work, the vermiculite seals of various thickness and compressive load during thermal cycles and long-term operation were investigated. The leakage rates of seals were gradually increased with increasing thickness and input gas pressure. The thinner seals had good sealing performance. The compressive load was carried out at thinner seals, the possible holes were squeezed, and finally the leakage rates were lower. With a fixed input gas p

APA, Harvard, Vancouver, ISO, and other styles

8

Ruscher, Brandi, Jillian M. Sills, Beau P. Richter, and Colleen Reichmuth. "In-air hearing in Hawaiian monk seals: implications for understanding the auditory biology of Monachinae seals." Journal of Comparative Physiology A 207, no. 4 (2021): 561–73. http://dx.doi.org/10.1007/s00359-021-01498-y.

Full text

Abstract:

AbstractThe auditory biology of Monachinae seals is poorly understood. Limited audiometric data and certain anatomical features suggest that these seals may have reduced sensitivity to airborne sounds compared to related species. Here, we describe the in-air hearing abilities of a Hawaiian monk seal (Neomonachus schauinslandi) trained to participate in a psychophysical paradigm. We report absolute (unmasked) thresholds for narrowband signals measured in quiet conditions across the range of hearing and masked thresholds measured in the presence of octave-band noise at two frequencies. The behav

APA, Harvard, Vancouver, ISO, and other styles

9

Liang, Xiaobin, Fan Fei, Weifeng Ma, Ke Wang, Junjie Ren, and Junming Yao. "Study on Suitability Evaluation Method of Non-Metallic Seals in Long Distance Hydrogen-Doped Natural Gas Pipelines." Processes 12, no. 11 (2024): 2353. http://dx.doi.org/10.3390/pr12112353.

Full text

Abstract:

Hydrogen doping using existing natural gas pipelines is a promising solution for hydrogen transportation. A large number of non-metallic seals are currently used in long-distance natural gas pipelines. Compared with metallic seals, non-metallic seals have the advantages of corrosion resistance, light weight, and easy processing, which can improve the safety and economy of pipelines. In order to ensure the long-term safe use of seals in hydrogen-doped natural gas pipelines, this paper selects the non-metallic seals commonly used in long-distance natural gas pipelines and carries out the hydroge

APA, Harvard, Vancouver, ISO, and other styles

10

Tougaard, Jakob, Kristian Beedholm, and Peter T. Madsen. "Comment on “Similar susceptibility to temporary hearing threshold shifts despite different audiograms in harbor porpoises and harbor seals” [J. Acoust. Soc. Am. 155, 396–404 (2024)] (L)." Journal of the Acoustical Society of America 157, no. 1 (2025): 538–41. https://doi.org/10.1121/10.0035452.

Full text

Abstract:

Gransier and Kastelein [J. Acoust. Soc. Am. 155, 396–404 (2024)] present a review of selected studies on temporary threshold shift (TTS) in seals and porpoises. In contrast to the conclusion made in the paper, the results presented are fully consistent with the current understanding that sound exposure level is the best overall predictor of TTSs in marine mammals. If all available TTS studies on seals and porpoises exposed to narrowband noise are included, there is support neither for the conclusion that seals and porpoises are equally susceptible to TTSs nor for their claim that audiograms ar

APA, Harvard, Vancouver, ISO, and other styles

11

Lunn, N. J., I. Stirling, and S. N. Nowicki. "Distribution and abundance of ringed (Phoca hispida) and bearded seals (Erignathus barbatus) in western Hudson Bay." Canadian Journal of Fisheries and Aquatic Sciences 54, no. 4 (1997): 914–21. http://dx.doi.org/10.1139/f96-346.

Full text

Abstract:

We flew a medium-altitude, systematic, strip-transect survey for ringed (Phoca hispida) and bearded seals (Erignathus barbatus) over western Hudson Bay in early June 1994 and 1995. The mean density (per square kilometre) of ringed seals hauled out on the ice was four times higher in 1995 (1.690) than in 1994 (0.380). The 1994 survey appeared to underestimate seal abundance because it was flown too late. Ringed seals preferred high ice cover habitat (6 + /8 ice) and, within this habitat, favoured cracking ice and large floes. We found no consistent effect of either wind or cloud cover on habita

APA, Harvard, Vancouver, ISO, and other styles

12

Tougaard, Jakob, Kristian Beedholm, and Peter T. Madsen. "Thresholds for noise induced hearing loss in harbor porpoises and phocid seals." Journal of the Acoustical Society of America 151, no. 6 (2022): 4252–63. http://dx.doi.org/10.1121/10.0011560.

Full text

Abstract:

Intense sound sources, such as pile driving, airguns, and military sonars, have the potential to inflict hearing loss in marine mammals and are, therefore, regulated in many countries. The most recent criteria for noise induced hearing loss are based on empirical data collected until 2015 and recommend frequency-weighted and species group-specific thresholds to predict the onset of temporary threshold shift (TTS). Here, evidence made available after 2015 in light of the current criteria for two functional hearing groups is reviewed. For impulsive sounds (from pile driving and air guns), there

APA, Harvard, Vancouver, ISO, and other styles

13

Canada, Joseph, and Erica E. Harris. "The Role of Web Assurance Seals in Nonprofit Giving." Journal of Information Systems 34, no. 2 (2019): 131–48. http://dx.doi.org/10.2308/isys-52614.

Full text

Abstract:

ABSTRACT Using a sample of the 2,000 largest nonprofit organizations in the U.S., we document that the use of web assurance seals is not as commonplace as for-profit e-commerce websites. In particular, we find that only about 14 percent of sample organizations invest in web assurance seals. Those that do provide web seals are larger, less efficient, and spend more on fundraising and information technology. Interestingly, however, our size result weakens for the very largest organizations in our sample. In addition to our contribution to the web assurance literature, we also contribute to donat

APA, Harvard, Vancouver, ISO, and other styles

14

Kingsley, Michael C. S. "The numbers of ringed seals (Phoca hispida) in Baffin Bay and associated waters." NAMMCO Scientific Publications 1 (June 12, 1998): 181. http://dx.doi.org/10.7557/3.2988.

Full text

Abstract:

The size of the population of ringed seals (Phoca hispida) inhabiting Baffin Bay and associated waters was estimated by two methods. An approximate model of the energetics of the polar bear (Ursus maritimus) estimated an energetic need of about 16,000 MJ/bear per year. Modelled estimates of the energetic yield of a ringed seal population showed that a stable standing population of 140-170 ringed seals per bear would be needed to provide that much energy, assuming that all mortalities were due to polar bear predation. This result was sensitive to assumptions about the Field Metabolic Rate (FMR)

APA, Harvard, Vancouver, ISO, and other styles

15

Zhulyov, A., V. Martsinkovsky, and C. Kundera. "Analysis of Forced Spatial Vibrations of a Centrifugal Pump Impeller with Axial Forces Balancing Device." International Journal of Applied Mechanics and Engineering 21, no. 3 (2016): 737–50. http://dx.doi.org/10.1515/ijame-2016-0043.

Full text

Abstract:

Abstract In this paper, a model of a pump impeller with annular seals and a balancing device, used as a combined support-seal assembly, is considered. The forced coupled radial, angular and axial vibrations of the rotor are determined with consideration of linearized inertial, damping, gyroscopic, positional and circulating forces and moments acting on the impeller from the side of the fluid flow in annular seals. The theoretical analysis is supplemented with a numerical example, the amplitude frequency characteristics are shown.

APA, Harvard, Vancouver, ISO, and other styles

16

McIntyre, Trevor, Ashleigh Donaldson, and Marthán N. Bester. "Spatial and temporal patterns of changes in condition of southern elephant seals." Antarctic Science 28, no. 2 (2015): 81–90. http://dx.doi.org/10.1017/s0954102015000553.

Full text

Abstract:

AbstractThe study of foraging success in marine predators is complicated by a lack of direct observations and relies mostly on proxy measures of foraging success. This study assessed spatial and temporal patterns of changes in body condition of southern elephant seals (Mirounga leonina) from Marion Island, based on changes in drift rates (which are related to gains and losses of blubber). Seals showed substantial individual variation in condition changes throughout migrations, which was not explained by age-, sex- or reproductive stages. Substantial variation was also evident in the spatial pa

APA, Harvard, Vancouver, ISO, and other styles

17

Ruscher, Brandi, Kirby Parnell, Jillian M. Sills, and Colleen Reichmuth. "Hawaiian monk seal terrestrial communication range estimates." Journal of the Acoustical Society of America 156, no. 4_Supplement (2024): A85. https://doi.org/10.1121/10.0035192.

Full text

Abstract:

The acoustic biology of Hawaiian monk seals (Neomonachus schauinslandi) is compelling due to their evolutionary and biogeographical separation from related species, prolonged breeding season, and endangered status. Recent auditory measurements suggest that terrestrial communication is constrained by poor hearing, but limited available information about vocal behavior precludes communication range estimates. In this study, we recorded spontaneous vocalizations from free-ranging monk seals at Kalaupapa National Historical Park (Molokaʻi, HI) to describe spectral characteristics and provide the f

APA, Harvard, Vancouver, ISO, and other styles

18

Ponganis, Paul J., Gerald L. Kooyman, Eugene A. Baranov, Philip H. Thorson, and Brent S. Stewart. "The aerobic submersion limit of Baikal seals, Phoca sibirica." Canadian Journal of Zoology 75, no. 8 (1997): 1323–27. http://dx.doi.org/10.1139/z97-756.

Full text

Abstract:

An aerobic dive limit (ADL), the diving duration beyond which postdive lactate concentration increases above the resting level, has been estimated theoretically for many species. Such calculations have been based on an oxygen store/diving metabolic rate (MR) equation. Until now, an ADL has been determined empirically from measurements of blood lactate concentration only in the Weddell seal, Leptonychotes weddellii. We measured post-submergence plasma lactate concentrations during spontaneous voluntary submersions of three captive adult Baikal seals (Phoca sibirica). Two-phase regression analys

APA, Harvard, Vancouver, ISO, and other styles

19

Lavigne, D. M., S. Innes, G. A. J. Worthy, K. M. Kovacs, O. J. Schmitz, and J. P. Hickie. "Metabolic rates of seals and whales." Canadian Journal of Zoology 64, no. 2 (1986): 279–84. http://dx.doi.org/10.1139/z86-047.

Full text

Abstract:

A critical review of metabolic rate determinations for pinnipeds (seals, sea lions, fur seals, and walrus) and cetaceans (whales, dolphins, and porpoises) does not support the widely accepted generalization that they have higher metabolic rates than terrestrial mammals of similar size. This finding necessitates a rethinking of the thermoregulatory adaptations of these marine mammals for an aquatic existence and has important implications in comparative studies of mammals, which frequently omit marine forms because they are perceived to be "different" from other mammals. It also suggests that n

APA, Harvard, Vancouver, ISO, and other styles

20

Simmonds, Mark. "What future for European seals now the epidemic is over?" Oryx 25, no. 1 (1991): 27–32. http://dx.doi.org/10.1017/s0030605300034037.

Full text

Abstract:

The European seal epidemic killed approximately 60 per cent of harbour or common seals Phoca vitulina in the colonies of the Wadden Sea, Kattegat–Skagerrak and the Norfolk Wash. High mortality was also observed elsewhere. The die-off peaked in 1988 and few affected seals have been reported subsequently. But what of the future? Is the marine environment still able to support healthy seal populations; is there enough suitable habitat for them; is there enough food; what is the impact of pollution on them; and why has no new legislation been implemented to protect them?

APA, Harvard, Vancouver, ISO, and other styles

21

Daschkovska, Kateryna. "Decision Support in Supply Chains Based on E-Seals Secure System." IFAC-PapersOnLine 50, no. 1 (2017): 14224–29. http://dx.doi.org/10.1016/j.ifacol.2017.08.2096.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Burg, Theresa M., Andrew W. Trites, and Michael J. Smith. "Mitochondrial and microsatellite DNA analyses of harbour seal population structure in the northeast Pacific Ocean." Canadian Journal of Zoology 77, no. 6 (1999): 930–43. http://dx.doi.org/10.1139/z99-057.

Full text

Abstract:

The genetic diversity and population structure of harbour seals (Phoca vitulina richardsi) along the coasts of British Columbia and parts of Alaska were investigated using both mitochondrial DNA (mtDNA) and nuclear DNA. A 475-bp fragment of the mitochondrial control region was amplified and sequenced from 128 animals. Sixty variable sites defined 72 mtDNA haplotypes with pairwise nucleotide differences as high as 5%. Fifty-eight haplotypes were represented by a single individual, and shared haplotypes were generally restricted to a small geographic range. Phylogenetic reconstruction revealed t

APA, Harvard, Vancouver, ISO, and other styles

23

Reeves, Randall R., George W. Wenzel, and Michael CS Kingsley. "Catch history of ringed seals (Phoca hispida) in Canada." NAMMCO Scientific Publications 1 (June 5, 1998): 100. http://dx.doi.org/10.7557/3.2983.

Full text

Abstract:

The ringed seal (Phoca hispida) has always been a staple in the diet and household economy of Inuit in Canada. The present paper was prepared at the request of the NAMMCO Scientific Committee to support their assessment of ringed seal stocks in the North Atlantic Basin and adjacent arctic and subarctic waters. Specifically, our objective was to evaluate recent and current levels of use of ringed seals by Canadian Inuit. Annual removals probably were highest (possibly greater than 100,000) in the 1960s and 1970s, a period when sealskin prices were particularly strong. Catches declined substanti

APA, Harvard, Vancouver, ISO, and other styles

24

Etnier, Michael A. "Reevaluating evidence of density-dependent growth in northern fur seals (Callorhinus ursinus) based on measurements of archived skeletal specimens." Canadian Journal of Fisheries and Aquatic Sciences 61, no. 9 (2004): 1616–26. http://dx.doi.org/10.1139/f04-090.

Full text

Abstract:

Analysis of length-at-age measurements of archived skeletal material shows that somatic growth rates of male northern fur seals (Callorhinus ursinus) vary inversely with population density. Von Bertalanffy growth curves were estimated for two series of known-age mandibles collected 19111920 (n = 156) and 19401953 (n = 151), time periods representing the historic population minimum and maximum, respectively. Mandibles from the former time period are larger than mandibles from the latter time period, suggesting a density-dependent response in somatic growth. Although density-dependent growth i

APA, Harvard, Vancouver, ISO, and other styles

25

Lewis, M., C. Campagna, M. R. Marin, and T. Fernandez. "Southern elephant seals north of the Antarctic Polar Front." Antarctic Science 18, no. 2 (2006): 213–21. http://dx.doi.org/10.1017/s0954102006000253.

Full text

Abstract:

This paper reports on sightings and dispersion of individual southern elephant seals (Mirounga leonina) along the Atlantic and Pacific coasts of South America based on reports of tagged/marked seals from Patagonia and of animals of unknown origin. From 154 sightings, encompassing at least 354 individuals, we found that individuals dispersed to subequatorial latitudes on both sides of the continent, and to more temperate sites, in the Magellanic region of Tierra del Fuego. Nineteen sites were visited by tagged seals from the established colony of Península Valdés (PV, Argentina). PV and the sma

APA, Harvard, Vancouver, ISO, and other styles

26

Kakuschke, Antje, Juergen Gandrass, O. P. Luzardo, et al. "Postmortem Health and Pollution Investigations on Harbor Seals (Phoca vitulina) of the Islands Helgoland and Sylt." ISRN Zoology 2012 (March 7, 2012): 1–8. http://dx.doi.org/10.5402/2012/106259.

Full text

Abstract:

Helgoland and Sylt are important centers of tourism in the North Sea. Harbor and grey seals are one reason for the attraction of these islands. However, little is known about these local seal groups. The present postmortem health and pollution study describes a multiparameter investigation of five ill harbor seals which were shot for animal welfare reasons. Firstly, results of pathology and blood investigations support the bad prognosis of survival made in the field. Signs of inflammation in organs, malnutrition, a high-stress level, and reduced thyroid activity were found. Secondly, metal and

APA, Harvard, Vancouver, ISO, and other styles

27

NADLER, S. A., S. D'AMELIO, H. P. FAGERHOLM, B. BERLAND, and L. PAGGI. "Phylogenetic relationships among species of Contracaecum Railliet & Henry, 1912 and Phocascaris Høst, 1932 (Nematoda[ratio ]Ascaridoidea) based on nuclear rDNA sequence data." Parasitology 121, no. 4 (2000): 455–63. http://dx.doi.org/10.1017/s0031182099006423.

Full text

Abstract:

Nuclear-encoded large-subunit ribosomal DNA sequences were used to infer a phylogenetic hypothesis for 17 taxa (16 nominal species) of the genera Contracaecum and Phocascaris. Phylogenetic trees based on these data have been used to assess the validity of the taxonomic distinction between these genera, which was based on the presence or absence of certain structural features, rather than on explicit hypotheses of evolutionary history. Phylogenetic hypotheses based on parsimony, likelihood, and neighbor-joining analyses of these sequence data strongly support the hypothesis that species of Phoc

APA, Harvard, Vancouver, ISO, and other styles

28

Zhang, Xiumin, Mingfu Yin, and Huilai Sun. "Establishment and solution of governing equation for plana-grooved liquid seals based on three-control-volume theory." Industrial Lubrication and Tribology 72, no. 3 (2019): 257–66. http://dx.doi.org/10.1108/ilt-06-2019-0228.

Full text

Abstract:

Purpose This paper aims to study the dynamic characteristics of the straight-through labyrinth seals, which is applied on an oil sealing belt of hydrostatic support system (HSS) oil pocket, the establishment and solution process of seal governing equation is deduced. Design/methodology/approach The three-control-volume model theory is an efficient approach that is applied well. This paper starts with three relative governing equations for the flow characteristics of straight-through labyrinth seals in the plane direction. Referring to the establishment process of governing equations for circum

APA, Harvard, Vancouver, ISO, and other styles

29

Sayer, Sue, Rebecca Allen, Lucy A. Hawkes, Kate Hockley, Dan Jarvis, and Matthew J. Witt. "Pinnipeds, people and photo identification: the implications of grey seal movements for effective management of the species." Journal of the Marine Biological Association of the United Kingdom 99, no. 5 (2019): 1221–30. http://dx.doi.org/10.1017/s0025315418001170.

Full text

Abstract:

AbstractGrey seals (Halichoerus grypus) of the North-east Atlantic are protected at designated European Marine Sites (Special Areas of Conservation, SACs) typically during their reproductive periods and in the UK at Sites of Special Scientific Interest (SSSI). As a mobile marine species, grey seals spend other parts of their annual life cycle in non-designated habitat. There is limited information on individual grey seal movements in south-west England. Citizen science photo identification (PID) revealed the movements of 477 grey seals at a regional scale (54 haul-outs up to 230 km apart) for

APA, Harvard, Vancouver, ISO, and other styles

30

Zhang, Xi, Ping Zhao, and Yu Bai. "The Research of Performance Test System of Seals in Hydraulic Support Column." Advanced Materials Research 468-471 (February 2012): 2542–45. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.2542.

Full text

Abstract:

In order to solve the problem that there is no appropriate testing method for the purchasing process of sealing washer in hydraulic support producing company at present, the author designed a test bed used to test the seal performance of hydraulic cylinder in the mine hydraulic support to provide database supports for purchasing sealing washer for hydraulic support manufacturers, by using the performance testing system of sealing washer worked upright column for hydraulic support. The introduction of the principles, constitutions and functions of the test bed will be shown in this paper. After

APA, Harvard, Vancouver, ISO, and other styles

31

Nau, B. S. "The State of the Art of Rubber-Seal Technology." Rubber Chemistry and Technology 60, no. 3 (1987): 381–416. http://dx.doi.org/10.5254/1.3536136.

Full text

Abstract:

Abstract The understanding of the engineering fundamentals of rubber seals of all the various types has been developing gradually over the past two or three decades, but there is still much to understand, Tables V–VII summarize the state of the art. In the case of rubber-based gaskets, the field of high-temperature applications has scarcely been touched, although there are plans to initiate work in this area both in the U.S.A. at PVRC, and in the U.K., at BHRA. In the case of reciprocating rubber seals, a broad basis of theory and experiment has been developed, yet it still is not possible to

APA, Harvard, Vancouver, ISO, and other styles

32

Teisl, Mario F. "What We May Have Is a Failure to Communicate*: Labeling Environmentally Certified Forest Products." Forest Science 49, no. 5 (2003): 668–80. http://dx.doi.org/10.1093/forestscience/49.5.668.

Full text

Abstract:

Abstract To develop an understanding of the performance of different eco-labels for certified forest products, we administered a mail survey to a nationally representative sample of U.S. residents. In the survey, respondents viewed different eco-labels and were asked to perform a series of tasks designed to measure the labels' communication performance. Results indicate that relatively detailed labels are more beneficial for consumers (and environmentally sensitive forest product manufacturers) than simpler eco-seals. Eco-seals are the least credible type of label and, in general, do not allow

APA, Harvard, Vancouver, ISO, and other styles

33

Serhii, Shevchenko. "Development of a Mechanical Seal Closed Design Model." IgMin Research 2, no. 2 (2024): 113–20. http://dx.doi.org/10.61927/igmin152.

Full text

Abstract:

The operating experience of mechanical seals shows that as a result of angular deformations of the rings, the wear of the contact surfaces along the radius is uneven. When designing mechanical seals, it is necessary to calculate the amount of expected leakage through the seal, friction power consumption, as well as the possible durability of the unit. These calculated dependencies and estimates are obtained based on the constructed mechanical seal model. In the area of hydrodynamic load support in the case of a confusor joint or a converging film, the slope of the pressure diagram is such that

APA, Harvard, Vancouver, ISO, and other styles

34

Stirbescu, Nicolae Mihail, Rodica Mariana Ion, Adrian Radu, et al. "Complex Analytical Investigations of Old Wax - sealed Romanian Paper Documents." Revista de Chimie 69, no. 7 (2018): 1608–11. http://dx.doi.org/10.37358/rc.18.7.6380.

Full text

Abstract:

Waxes as a component of seals, are recognized in our history as adhesives, for surface coating purposes, modeling or casting materials and also in conservation practice. The waxes with mineral, vegetable and animal origin should be connected to modern methods of analysis, due to their complex composition: long chain hydrocarbons, acids, alcohols, esters. They support many mechanical damages in library and archive collections: cracking, pieces lost by an excessive handling of documents. In this paper the compositional analyses of some wax seals belonging to some paper samples have been achieved

APA, Harvard, Vancouver, ISO, and other styles

35

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

36

Kruglyak, S. A. "The Issue of Methodological Support of Forensic Examination of Locks and Security Seals." Theory and Practice of Forensic Science, no. 3(43) (September 30, 2016): 59–63. http://dx.doi.org/10.30764/64/1819-2785-2016-3-59-63.

Full text

Abstract:

The author summarizes the possibilities, achievements, and outlook for developing the methodological framework of toolmark analysis, including the examination of locks and security seals. The significance of toolmark analysis performed on these objects is demonstrated in the context of investigating different types of crimes. The author offers suggestions on the need to develop state-of-the-art forensic methodologies, and to improve the design of locking devices.

APA, Harvard, Vancouver, ISO, and other styles

37

Long, Brett, Chip Arnold, Carrie Goertz, and Lee Majors. "Mobile Treatment and Rehabilitation Enclosure (MTRE) for small pinnipeds." International Oil Spill Conference Proceedings 2014, no. 1 (2014): 300054. http://dx.doi.org/10.7901/2169-3358-2014-1-300054.1.

Full text

Abstract:

The North Slope of Alaska is a demanding and harsh environment. Being prepared for an oil spill involving wildlife in this region requires training, innovation, and partnerships. For the past three years animal care groups, industry oil spill response organizations, and federal agencies have been collaborating to prepare for such an event. Protocol development is an essential and initial process to accomplish response goals. In 2011, protocols were developed for the care of oiled affected phocid seals in Alaska, focusing on the need for remote, deployable operations in the arctic. While develo

APA, Harvard, Vancouver, ISO, and other styles

38

Yin, Yuan, Xiangfeng Liu, Weifeng Huang, Ying Liu, and Songtao Hu. "Gas face seal status estimation based on acoustic emission monitoring and support vector machine regression." Advances in Mechanical Engineering 12, no. 5 (2020): 168781402092132. http://dx.doi.org/10.1177/1687814020921323.

Full text

Abstract:

The difficulty of knowing the real-time status of gas face seals is the main cause of common problems, including sudden failure, ineffective diagnosis, and unpredictability of service life. This study analyzed the acoustic emission signals generated from experiments, uncovering their features in terms of the frequency distribution, periodic fluctuations, and the behaviors during different operation phases. A new vectorization procedure was designed according to the knowledge of informative acoustic emission features. Based on the vectorization procedure, a support vector machine regression met

APA, Harvard, Vancouver, ISO, and other styles

39

Zhang, Xi, Da Long Wang, Xin Xing Liu, Miao Yu, Peng Xia, and Yan Yan Wang. "Design of Lifting System in Seals of the Hydraulic Support Eccentric Loading Test Bench Based on PLC and Stepper Motor." Advanced Materials Research 889-890 (February 2014): 902–5. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.902.

Full text

Abstract:

Make use of programmable logic controller (PLC) to control stepper motor to drive the lift of seals of the hydraulic support eccentric loading test bench, in order to make the test bench meet the demand of eccentric loading. Using the Mitsubishi FX series PLC as an example, introduce the methods and principles and realization of lifting action.

APA, Harvard, Vancouver, ISO, and other styles

40

Adams, S. H., D. P. Costa, and S. C. Winter. "Plasma carnitine in fasting neonatal and adult northern elephant seals." American Journal of Physiology-Endocrinology and Metabolism 263, no. 3 (1992): E570—E574. http://dx.doi.org/10.1152/ajpendo.1992.263.3.e570.

Full text

Abstract:

Maintenance of adequate body carnitine stores is a requisite for fasting mammals, whose energy is derived mainly from free fatty acid oxidation. The impact of longterm fasting on carnitine status is unclear, and there have been no reports of carnitine during naturally occurring fasts. Total (TC), free (FC), and acylated (AC) plasma carnitine levels were determined in 10 weaned and 11 adult northern elephant seals (Mirounga angustirostris) during natural fasts lasting from 1 to 3 mo. In pups, TC declined little and AC increased only slightly [P greater than 0.05, analysis of variance (ANOVA)] t

APA, Harvard, Vancouver, ISO, and other styles

41

Sprowl, Tony B., and Dara W. Childs. "A Study of the Effects of Inlet Preswirl on the Dynamic Coefficients of a Straight-Bore Honeycomb Gas Damper Seal." Journal of Engineering for Gas Turbines and Power 129, no. 1 (2004): 220–29. http://dx.doi.org/10.1115/1.2227416.

Full text

Abstract:

Honeycomb seals are frequently used as replacements for labyrinth seals in high-pressure centrifugal compressors to enhance rotordynamic stability. A concern exists that this enhanced stability will be lost if the honeycomb cavities become clogged. Static and dynamic tests were conducted on a honeycomb and a smooth seal (representing the honeycomb seal with completely clogged cells) at the same constant clearances using air with a supply pressure of 70 bars. The test matrix included three speeds, three pressure ratios, and three inlet preswirl conditions. The results show increased leakage, de

APA, Harvard, Vancouver, ISO, and other styles

42

Chen, Xiaolan, Fuquan Tu, Feng Gao, Heming Cheng, and Shixiong Xing. "Variable Gap Sealing Technology of a Hydraulic Cylinder Based on Magnetic Shape Memory Alloy." Coatings 11, no. 8 (2021): 950. http://dx.doi.org/10.3390/coatings11080950.

Full text

Abstract:

The synergistic control of resistance reduction and sealing poses challenges to enhancing the rapid dynamic response ability of servo hydraulic cylinders; the key to solving this problem is effectively controlling the sealing gap value. In this study, a micro-variation between the hydraulic cylinder and the piston based on the disadvantage of conventional seals, constant gap seals, and lip gap seals was constructed; MSMA assist support blocks were designed on the piston to form a gap seal strip; then, the sealing gap value could be changed by controlling the magnetic field intensity. Simultane

APA, Harvard, Vancouver, ISO, and other styles

43

Gabelli, A., and G. Poll. "Formation of Lubricant Film in Rotary Sealing Contacts: Part I—Lubricant Film Modeling." Journal of Tribology 114, no. 2 (1992): 280–87. http://dx.doi.org/10.1115/1.2920885.

Full text

Abstract:

The lubricant film developed in rotary lip seals is a vital element in achieving long-lasting seals with low friction. In this paper the basic principles controlling the development of a lubricant film in lip seals are studied using a micro-hydrodynamic model. This model takes into account the visco-elastic effects of the rubber on the development of the sealing pressure. Central to the model’s hypothesis is the assumption of the predominant action of the surface micro-geometry in the formation of the lubricant film. Optical observations of the contact area of a lip seal, using blue light indu

APA, Harvard, Vancouver, ISO, and other styles

44

Andersen, Julie M., Yolanda F. Wiersma, Garry B. Stenson, Mike O. Hammill, Aqqalu Rosing-Asvid, and Mette Skern-Maurizen. "Habitat selection by hooded seals (Cystophora cristata) in the Northwest Atlantic Ocean." ICES Journal of Marine Science 70, no. 1 (2012): 173–85. http://dx.doi.org/10.1093/icesjms/fss133.

Full text

Abstract:

Abstract Andersen, J. M., Wiersma, Y. F., Stenson, G. B., Hammill, M. O., Rosing-Asvid, A., and Skern-Maurizen, M. 2013. Habitat selection by hooded seals (Cystophora cristata) in the Northwest Atlantic Ocean. – ICES Journal of Marine Science, 70:173–185. We examined annual habitat use for 65 hooded seals (32 adult females, 17 adult males, and 16 juveniles) equipped with satellite relay data loggers (SRDLs) in spring or summer during five field seasons (2004–2008). A combined approach using first passage time (FPT) analysis and a generalized additive model (GAM) was applied to test for habitat

APA, Harvard, Vancouver, ISO, and other styles

45

Ma, Dengqian, Jun Li, Yuanqiao Zhang, Zhigang Li, Xin Yan, and Liming Song. "Application of blade tip shroud brush seal to improve the aerodynamic performance of turbine stage." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 6 (2019): 777–94. http://dx.doi.org/10.1177/0957650919883153.

Full text

Abstract:

The blade tip shroud brush seal is applied to replace the labyrinth seal for the aerodynamic performance improvement of turbine stage. The leakage flow characteristics of the brush seal are numerically predicted by using the Reynolds-Averaged Navier–Stokes equations and non-linear Darcian porous medium model. The numerical leakage flow rate of the brush seal is in well agreement with the experimental data. The last and first long teeth of the labyrinth seal were designed to bristle pack named as the postposed and preposed brush seals based on the 1.5 turbine stage. The leakage flow rate and ae

APA, Harvard, Vancouver, ISO, and other styles

46

Crocker, Daniel E., Burney J. Le Boeuf, and Daniel P. Costa. "Drift diving in female northern elephant seals: implications for food processing." Canadian Journal of Zoology 75, no. 1 (1997): 27–39. http://dx.doi.org/10.1139/z97-004.

Full text

Abstract:

We tested predictions from the hypothesis that northern elephant seals, Mirounga angustirostris, drift during the bottom segment of some dives (called C dives) using oxygen saved from reduced locomotion to process food. Sixteen free-ranging dive records were obtained with microcomputer dive recorders attached to 13 adult females from Año Nuevo, California, during biannual foraging trips when they were in early or late stages of gestation; swim speed was recorded throughout one dive record. Body composition was measured before and after trips to sea. C dives with a bout length of 2 – 10 dives a

APA, Harvard, Vancouver, ISO, and other styles

47

Beatty, R. F., and M. J. Hine. "Improved Rotor Response of the Uprated High Pressure Oxygen Turbopump for the Space Shuttle Main Engine." Journal of Vibration and Acoustics 111, no. 2 (1989): 163–69. http://dx.doi.org/10.1115/1.3269837.

Full text

Abstract:

During development testing of the High Pressure Oxygen Turbopump (HPOTP) of the Space Shuttle Main Engine (SSME) to produce 109 percent of the rated thrust level, subsynchronous rotor whirl was encountered. This whirl was attributed to bearing wear reducing the radial bearing stiffness that caused the rotor second bending mode critical speed to enter the operating speed range. To eliminate this whirl, the pump end bearing loads were reduced to increase bearing life and damping added between the rotor and housing. This was achieved by converting impeller annular seals into “damping” seals that

APA, Harvard, Vancouver, ISO, and other styles

48

Burstein, Leonid, and Dov Ingman. "Effect of Pore Ensemble Statistics on Load Support of Mechanical Seals With Pore-Covered Faces." Journal of Tribology 121, no. 4 (1999): 927–32. http://dx.doi.org/10.1115/1.2834157.

Full text

Abstract:

A mathematical model was developed for predicting the performance of laser-textured seals with pores. A solution of the two-dimensional steady-state Reynolds equation was given for rectangular and exponential pores, as well as expressions for the hydrodynamic pressure distribution over the control cell and for the cell load support. The difference between the two pore shapes can be reduced from a factor of multiple times to 30 percent at most—if the pore volume is kept constant. It was also shown that the total hydrodynamically induced load-carrying capacity can be obtained with accuracy, even

APA, Harvard, Vancouver, ISO, and other styles

49

Boyd, I. L., D. J. McCafferty, K. Reid, R. Taylor, and T. R. Walker. "Dispersal of male and female Antarctic fur seals (Arctocephalus gazella)." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 4 (1998): 845–52. http://dx.doi.org/10.1139/f97-314.

Full text

Abstract:

This study examined the foraging locations of adult male and female Antarctic fur seals (Arctocephalus gazella) in the Scotia Sea during the postbreeding period. Satellite transmitters were used to track adult males and females and to obtain information about dive depths. Male fur seals migrated away from the breeding area during the postbreeding period whereas females remained close to the breeding grounds and foraged in the same area during two consecutive years. The most intensive foraging by females was associated with the edge of the continental shelf of South Georgia. Males dived deeper

APA, Harvard, Vancouver, ISO, and other styles

50

de Oliveira, Larissa Rosa, Diogo Meyer, Joseph Hoffman, Patricia Majluf, and João S. Morgante. "Evidence of a genetic bottleneck in an El Niño affected population of South American fur seals, Arctocephalus australis." Journal of the Marine Biological Association of the United Kingdom 89, no. 8 (2009): 1717–25. http://dx.doi.org/10.1017/s0025315409000162.

Full text

Abstract:

The South American fur seal, Arctocephalus australis, was one of the earliest otariid seals to be exploited by humans: at least 6000 years ago on the Atlantic coast and 4000 on the Pacific coast of South America. More than 750,000 fur seals were killed in Uruguay until 1991. However, a climatological phenomenon—the severe 1997–1998 El Niño Southern Oscillation (ENSO)—was responsible for the decline of 72% of the Peruvian fur seal population due to starvation as a consequence of warming of sea-surface temperatures and primary productivity reduction. Currently, there is no precise information on

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!