Relevant bibliographies by topics / Barrier

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Barrier'

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

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Journal articles on the topic "Barrier"

1

Garcia, F., O. Rodriguez, J. Mesa, J. D. T. Arruda-Neto, V. P. Likhachev, E. Garrote, R. Capote, and F. Guzmán. "BARRIER code: Calculation of fission barriers." Computer Physics Communications 120, no. 1 (July 1999): 57–70. http://dx.doi.org/10.1016/s0010-4655(99)00199-x.

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Savosko, V. M. "Indicators for pedogeochemical barriers of heavy metals’ migration." Fundamental and Applied Soil Science 19, no. 1 (January 27, 2019): 15–21. http://dx.doi.org/10.15421/041903.

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The aims of this study were to substantiate indicators for pedogeochemical barriers of heavy metals’s migration. The concept of pedogeochemical barriers of heavy metals’migration. Pedogeochemical migration barrier is part of the soil horizon or soil profile, where, as a result of special pedosubstantsiya availability and certain pedogeochemical reactions percolation, there is a significant accumulation of some chemical elements. These barriers act as a «substation-reactionary phenomenon». Pedogeochemical migration barrier grouped into five types: mechanical A, physical (sorption) B, physicochemical (ion exchange) C, chemical D and biological E. Indicators of geochemical migration barriers. To assess the geochemical barriers to migration, A. I. Perelman suggested using barrier contrast indicators and the barrier gradient. Wherein, the barrier contrast is calculated as the ratio of the chemical element concentration on the barrier to its quantity up to the barrier. Barrier gradient is the ratio of soil differences before and after the barrier to its length. Indicators of pedogeochemical migration barriers. In soil science, as the analogue of the barrier contrast are: the contrast ratio, the coefficient of intra-profile differentiation, alluvial-accumulative coefficients. As an analogue of the gradient barriers, there are indices of absolute and relative gradients of pedogeochemical migration barriers. Indicators of Pedogeochemical migration barriers manifest that in the chernozems of ordinary and southern at Kryvyi Rih areas, the accumulation of heavy metals in the humus transition and humus accumulation horizons has been revealed. Wherein, the more intensive action of soil migration barriers is naturally revealed in chernozems of ordinary, in comparison with chernozems southern.
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Monazzam, M. R., and Samaneh M. B. Fard. "A Study on the Effect of Different Median Barrier Shapes in Presence of Single or Parallel Noise Screens." Advanced Materials Research 383-390 (November 2011): 5432–37. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5432.

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In most mega cities roadside barriers are used to protect receivers from noise pollution during recent years. Median noise barriers, like roadside noise barriers, can be employed to reduce the impact of traffic on roadside communities. In this study, a 2D boundary element method (BEM) is used to predict the insertion loss of different barrier models. It was shown that the performance of a median barrier along with a roadside barrier is affected if another road side barrier will be erected. However, it is possible to apply some new barrier designs to decline the negative effect of the extra roadside barrier. The best shape for inclined median barriers when erected inside parallel barriers was seen to be the tilted designed with 10 degrees slope.
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Alfauzy, Muhamad Naufal, and Arfenia Nita. "Determining Barriers Factors That Affecting Indonesian Young Customer Purchase Intention of Sustainable Fashion." Malaysian Journal of Social Sciences and Humanities (MJSSH) 6, no. 8 (August 10, 2021): 509–17. http://dx.doi.org/10.47405/mjssh.v6i8.938.

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This research aims to generate the correlation between several barrier factors: product design barrier, knowledge barrier, cost barrier, and supply source barrier towards Gen-Y customer purchase intention of sustainable fashion in Indonesia. This research is using the theory that stated barrier factors are directly influencing customer purchase intention. A total of 226 respondents all across Indonesia are selected through the non-probability purposive sampling technique. This study's instrument uses questionnaires that have been adjusted in terms of language and evaluated by using validity and reliability testing. The data output from data collection is analyzed with the multiple linear regression techniques. The findings indicate a significant influence between product design barriers, knowledge barriers, cost barriers, and supply source barriers simultaneously towards purchase intention of sustainable fashion among Indonesian Gen-Y. When assessed partially, product design barriers negatively influence purchase intention, and the result is significant. It means that the product design barrier is not a barrier that hinders the purchase intention of sustainable fashion. The knowledge barrier and cost barrier also negatively influence purchase intention of sustainable fashion, but the result is not significant. The supply source barrier has a positive influence on the purchase intention of sustainable fashion. It means there is an actual barrier that hinders the purchase intention of sustainable fashion. This study suggested that business owners make sustainable fashion more accessible on every platform, offline and online, to decrease the supply source barrier.
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Raut, Mr Abhijit. "Automotive Safety Rolling Barrier." International Journal for Research in Applied Science and Engineering Technology 9, no. VII (July 20, 2021): 1684–705. http://dx.doi.org/10.22214/ijraset.2021.36250.

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The government is always looking at the latest technology that can ensure safety of road users, as outlined in the construction industry transformation plan. A small Korean manufacturing company invented a new concept longitudinal barrier, (The Rolling Barrier) which had continuous pipes covered with urethane rings. This study aims to evaluate the effectiveness of the “Rolling Barrier” and to understand the Rolling Barrier’s characteristics of crash cushioning, how to correct the vehicles running direction and the required strength of barriers. They convert that impact energy into rotational energy to propel the vehicle forward rather than potentially breaking through an immovable barrier. When a car hits the barrier, the rotating barrel converts shock from the vehicle to rotational energy. Upper and lower frames adjust tires of large and small vehicles to prevent the steering system from a functional loss. The Rolling Barrier can be effectively used in curved roads sections, ramps, medians and entrance or exit ramps in parking garages. In this paper, the description and studies of Rolling Barriers are elaborated. In 2015, there were 63,805 traffic accidents over on the Maharashtra, India, with 54.2 % composed of vehicles that crashed into longitudinal barriers. Such accidents can be drastically reduced if more safe barriers are installed for traffic safety. A small Korean manufacturing company invented a new concept longitudinal barrier, the Rolling Barrier (RB), which has continuous pipes covered with urethane rings. This study aims to evaluate the effectiveness of the RB & to understand the RB’s characteristics of crash cushioning, how to correct the vehicle’s running direction & the required strength of barriers. Experiments with barriers performance & crashing vehicle behavior at curved sections using a 1.3-ton passenger car & a 3.5-ton truck showed satisfactory vehicle behavior as they ran parallel with the RB after crashing. The structural problem of the RB wasn’t found during the time of the crash. In the strength performance test using the 8-ton truck & in the passenger protection test using the 1.3-ton passenger car, the RB satisfied the Ministry of Construction & Transportation’s “ Guidelines for Installation & Management of Road Safety Facilities.” The differences between the RB & conventional barriers where crash cushioning & required strength of barriers were involved were verified by mathematical equations. The RB can be effectively used in curved road sections, ramps, medians & entrance/exit ramps in parking garages. Keywords: -accidents, longitudinal barrier, rolling barrier, traffic barrier, vehicle, collision
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Zaets, Vitaly. "Influence estimation of the inclination angle of the top of the noise protection barrier on its efficiency." Technology audit and production reserves 1, no. 1(57) (February 26, 2021): 12–16. http://dx.doi.org/10.15587/2706-5448.2021.225474.

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The object of research is the sound field from linear sound sources around a rounded noise barrier of the same height and different angles of inclination of the top part of the barrier. It is known that the effectiveness of noise protection barriers depends primarily on the geometric dimensions of the barrier and the relative position of the sound source, barrier and area of noise protection. A large number of publications have been devoted to the study of the influence of these factors and some others, such as the influence of the earth's surface, sound absorption, sound insulation of the barrier. However, these works did not study the effect of the angle of the top part of the barrier on the change in the barrier efficiency. In this paper, the reduction of sound levels from linear sound sources around noise barriers with different inclination angle of the top part of the barrier is investigated. Rounded barriers of the same height with different radii are considered, which made it possible to simulate barriers in which the top part of the barrier has a different inclination angle. An effectiveness of such barriers for various locations of the sound source, which could also affect the establishment of a pattern of changes in the effectiveness of barriers, is also considered. In addition, the results were analyzed over a wide frequency range. The calculation of the field around such a barrier was carried out using computer simulation using the finite element method. This method allows to easily change the geometric parameters of the barrier and the position of the sound source. The barriers were considered acoustically hard. Thus, an influence of the inclination angle of the top part of the barrier on the sound field around the barrier from various locations of sound sources in a wide frequency range is analysed. The results must be taken into account when designing noise barriers to reduce noise levels from traffic flows
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Erickson-DiRenzo, Elizabeth. "Barrier Function of the Laryngeal Mucosa." Perspectives of the ASHA Special Interest Groups 1, no. 3 (March 31, 2016): 54–62. http://dx.doi.org/10.1044/persp1.sig3.54.

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The larynx is exposed to nearly continuous insults from the airway, digestive tract, and through the mechanical stresses of vocal fold vibration. The protection from these insults offered by laryngeal mucosa is called barrier function. Two essential mucosal barriers include the epithelial barrier and the mucus barrier. The purpose of this article is to provide an introduction to our current knowledge of the laryngeal epithelial and mucus barriers. Specifically, the composition of these barriers will be discussed. Research generating novel model systems to study the epithelial and mucus barriers and investigations of how common insults impact barrier structure and function will be highlighted. Compromise of these barriers may substantially increase laryngeal susceptibility to injury and impact overarching laryngeal health. Despite recent gains in our understanding of the epithelial and mucus barriers, continued research is necessary in order to advance the field of laryngeal biology and develop novel therapeutic strategies to improve laryngeal barrier function.
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Wu, Xiaoping, Xuanyi He, and Jie Huang. "Comparative Analysis of Dynamic Responses of Different Types of High-Speed Railway Noise Barriers under the Influence of Fluctuating Wind Pressure." Sustainability 14, no. 19 (October 10, 2022): 12900. http://dx.doi.org/10.3390/su141912900.

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The fluctuating wind pressure generated when a high-speed train passes through the noise barrier will cause deformation and damage to the noise barrier, affecting the safety of train operation and causing serious economic losses. In this paper, a research method for the dynamic response of noise barriers is proposed, and a comparative study of vertical noise barriers and semi-enclosed noise barriers is carried out. The study shows that when trains pass through the noise barrier, the fluctuating wind pressure on the surface of the two different types of noise barriers both exhibit the characteristics of head and tail waves; the time course curve of fluctuating wind pressure has the same change rule, the wind pressure reaches the maximum value at the bottom measuring point, the maximum value of fluctuating wind positive pressure and negative pressure of the semi-closed noise barrier is larger than that of the vertical noise barrier. In terms of natural frequency, the natural frequency range of the vertical noise barrier is 16~85 Hz, and the natural frequency range of the semi-enclosed noise barrier is 3~13 Hz. The natural frequency of the semi-enclosed noise barrier partially coincides with the main frequency of fluctuating wind pressure, which may lead to resonance damage. When the train speed is raised from 200 km/h to 350 km/h, the maximum equivalent force of the semi-enclosed noise barrier reaches 17.21 Mpa, which is much larger than the maximum equivalent force of the vertical noise barrier. At the same time, the displacement of the two noise barriers increases with the height of the noise barrier, and the maximum displacement of the semi-closed noise barrier unit board reaches 3.63 mm, which is much larger than that of the vertical noise barrier unit board.
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Hanafi, Syahrul. "Does Information Affect Online Zakat Payment?" International Journal of Zakat 5, no. 3 (December 4, 2020): 57–72. http://dx.doi.org/10.37706/ijaz.v5i3.261.

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Indonesia has enormous potential for zakat, but the results of collecting zakat are still far from the existing potential. OPZ has made various ways to increase the collection of zakat funds, one of which is by implementing online zakat payments. This study aims to analyze the resistance to using online zakat payment services. The research approach is quantitative with the help of smartPLS software. This study's variables consist of information variables, which are independent variables, while the dependent variable consists of traditional barrier variables, image barriers, usage barriers, value barriers, and risk barriers. Data in this study collected using a questionnaire. The sample of this study was 100 respondents from various regions in Indonesia. The results showed that the information has a significant and negative effect on the traditional barrier variables, image barrier, usage barrier, value barrier. This means that the greater / more information provided by OPZ, the barrier in using online zakat payment services are getting smaller / less. The information variable on the risk barrier shows insignificant and negative results.
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Reid, John D., Robert W. Bielenberg, Ronald K. Faller, Karla A. Lechtenberg, and Dean L. Sicking. "Racetrack SAFER barrier on temporary concrete barriers." International Journal of Crashworthiness 18, no. 4 (August 2013): 343–55. http://dx.doi.org/10.1080/13588265.2013.794321.

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Dissertations / Theses on the topic "Barrier"

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Jayasekera, Rasika. "Condoms behind bars barriers to barrier protection /." [New Haven, Conn. : s.n.], 2008. http://ymtdl.med.yale.edu/theses/available/etd-12022008-141338/.

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Gunnarsson, Niklas. "Barrier options." Thesis, Uppsala University, Department of Mathematics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-122338.

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Fröjdh, Christer. "Schottky barriers and Schottky barrier based device on Si and SiC /." Sundsvall, 1998. http://www.lib.kth.se/abs98/froj0302.pdf.

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Jonas, Hartman. "Hemicellulose as barrier material." Licentiate thesis, KTH, Fibre and Polymer Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3907.

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Polysaccharides constitute an important source of raw materials for the packaging industry today. Polysaccharides have good natural barrier properties which are necessary for packaging films. Cellulose is the forerunner among renewable polymers for such applications. Hemicelluloses represent a new interesting breed of barrier materials. We have chosen to work with the hemicellulose O-acetyl-galactoglucomannan (AcGGM). The high water solubility of this particular hemicellulose extracted from process waters is both an advantage and a limiting factor. However, through the right modification, the water sensitivity of AcGGM can be regulated.

This thesis presents four ways to modify AcGGM: (i) benzylation, (ii) plasma surface treatment followed by styrene addition, (iii) vapor-phase (VP) surface grafting with styrene, and (iv) lamination of an unmodified film with a benzylated material. The most important methods of analysis of the films produced include contact angle measurement, dynamic mechanical analysis under moisture scan, and oxygen gas permeability measurement.

It was found that unmodified AcGGM films have low oxygen permeability at intermediate relative humidity (50 % RH) and good dynamic mechanical properties over a wider humidity range. Films of benzylated material (BnGGM) exhibited a decrease in oxygen permeability at lower humidity but showed better tolerance to higher humidities and indicated better dynamic mechanical behavior than AcGGM films. Lamination proved to be the most promising technique of modification, combining the good gas barrier properties of AcGGM films with the moisture-insensitivity of the BnGGM films.

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Brezeanu, Mihai. "Diamond Schottky barrier diodes." Thesis, University of Cambridge, 2008. https://www.repository.cam.ac.uk/handle/1810/226757.

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Research on wide band gap semiconductors suitable for power electronicdevices has spread rapidly in the last decade. The remarkable results exhibited bysilicon carbide (SiC) Schottky batTier diodes (SBDs), commercially available since2001, showed the potential of wide band gap semiconductors for replacing silicon (Si)in the range of medium to high voltage applications, where high frequency operationis required. With superior physical and electrical properties, diamond became apotential competitor to SiC soon after Element Six reported in 2002 the successfulsynthesis of single crystal plasma deposited diamond with high catTier mobility. This thesis discusses the remarkable properties of diamond and introducesseveral device structures suitable for power electronics. The calculation of severalfigures of merit emphasize the advantages of diamond with respect to silicon andother wide band gap semiconductors and clearly identifies the areas where its impactwould be most significant. Information regarding the first synthesis of diamond,which took place back in 1954, together with data regarding the modern technologicalprocess which leads nowadays to high-quality diamond crystals suitable for electronicdevices, are reviewed. Models regarding the incomplete ionization of atomic dopantsand the variation of catTier mobility with doping level and temperature have beenelaborated and included in numerical simulators. The study introduces the novel diamond M-i-P Schottky diode, a version ofpower Schottky diode which takes advantage of the extremely high intrinsic holemobility. The structure overcomes the drawback induced by the high activationenergies of acceptor dopants in diamond which yield poor hole concentration at roomtemperature. The complex shape of the on-state characteristic exhibited by diamondM-i-P Schottky structures is thoroughly investigated by means of experimentalresults, numerical simulations and theoretical considerations. The fabrication of a ramp oxide termination on a diamond device is for thefirst time reported in this thesis. Both experimental and simulated results show thepotential of this termination structure, previously built on Si and SiC power devices. A comprehensive comparison between the ramp oxide and two other versions of thefield plate termination concept, the single step and the three-step structures, has beenperformed, considering aspects such as electrical performance, occupied area,complexity of technological process and cost. Based on experimental results presented in this study, together withpredictions made via simulations and theoretical models, it is concluded that diamondM-i-P Schottky diodes have the ability to deliver significantly higher performancecompared to that of SiC SBDs if issues such as material defects, Schottky contactformation and measurement of reliable ionization coefficients are carefully addressedin the near future.
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Gandhi, Swapnilkumar J. "Barrier-mediated pulsatile release." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1601.

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Solutes are often most efficiently deployed in discrete pulses, for example in the delivery of herbicides or drugs. Manual application of each pulse can be labor-intensive, automated application of each pulse can be capital intensive, and both are often costly and impractical. Barrier-Mediated Pulsatile Release (BMPR) systems offer a materials-based alternative for automated pulsatile drug delivery, without pumps, power supplies, or complex circuitry. While earlier materials-based approaches such as delayed-release microcapsules are limited to two or three pulses due to the independent nature of each pulse’s timing control, BMPR systems link the timing of each pulse to the previous pulse. Each dose of drug is sequestered in its own stimuli-sensitive depot, releasing only upon contact with the stimulant. These depots are stacked with sacrificial barriers in between, each of which block the stimulant for a predetermined time. For instance, layers of soluble drug may be separated by degradable polymer layers. Water, as the stimulant, will erode the polymer layer over a fixed period of time, followed by quick dissolution and release of the underlying drug and the start of degradation for the next polymer layer. This example, however, is quickly limited by irregular polymer erosion, a single stimulant (water), and difficulty in scaling delay times. The research work presented in this thesis reports the development of a generalized BMPR system which overcomes those limitations. Model drugs (methylene blue and methyl orange) were immobilized in a pH-sensitive polymer [poly(methyl methacrylate-co-dimethylaminoethyl methacrylate)] which released only at low pH. Zinc oxide (ZnO) nanoparticles immobilized in a pH-insensitive matrix [poly(vinyl alcohol)] served as the barrier layer. The time required for acid to penetrate the barrier layer scaled with the ZnO concentration and with the square of the polymer thickness, allowing wide scaling of the delay time with only minor changes to the barrier layer. Harnessing the swelling pressure of the acid-sensitive hydrogel, each barrier/depot bilayer can delaminate upon solute release, directly exposing the next bilayer to the stimulant source. This system has demonstrated tuned release using a citric acid stimulant to produce up to ten pulses of model drug (methylene blue) over various preset timescales. This system has also demonstrated the alternate release of multiple solutes (methylene blue and methyl orange) at regular time intervals up to five pulses from a single BMPR device. For non-delaminating BMPR systems, spent bilayers impede stimulant diffusion to the inner layers and solute diffusion from the inner layers, increasing the delay time and the pulse width. To predict these changes, a computational model was constructed in FORTRAN. This model was extensively explored over a wide range of parameter space to understand the release behavior of various kinds of non-delaminating BMPR systems. The computer model also validates the performances of experimental delaminating BMPR system. This model can be used to guide the physical modeling of BMPR systems. The model also allows to incorporate variety of stimulants other than just acid. BMPR technology introduces efforts to further generalize the delivery strategy by incorporating glucose as a stimulant.
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Kramer, John N. III. "Barrier spit evolution and primary consolidation of backbarrier facies: West Belle Pass Barrier, LA." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2214.

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West Belle Pass Barrier is a barrier spit that formed during the last delta lobe progradation associated with the Lafourche delta complex. Located on the western flank of the Caminada-Moreau Headland, West Belle Pass Barrier and Raccoon Pass are located downdrift of the Belle Pass jetties. Morphological changes stemming from storms, jetty infrastructure, and an expanding tidal inlet are evaluated using historical shoreline data and imagery. Littoral transport around the jetties combined with inlet growth created a framework wherein sediment is transported through Raccoon Pass and sequestered as a flood-tidal delta. These events aided in the landward migration of West Belle Pass Barrier, which ultimately loaded and consolidated previously unconsolidated facies. A conceptual model illustrating the primary consolidation of backbarrier facies resulting from washover deposits during one storm is presented. The primary consolidation settlement associated with loading near-surface, water-saturated backbarrier facies is substantially larger than current subsidence rates.
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Zhang, Min. "Modelling and fabrication of high performance Schottky barrier SOI-MOSFETs with low effective Schottky barriers." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982694466.

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Germann, Christian. "Pricing Multi Barrier Reverse Convertibles." St. Gallen, 2008. http://www.biblio.unisg.ch/org/biblio/edoc.nsf/wwwDisplayIdentifier/97193445002/$FILE/97193445002.pdf.

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Kjellgren, Henrik. "Barrier properties of greaseproof paper." Licentiate thesis, Karlstad University, Division for Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1411.

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The barrier properties of greaseproof paper are achieved by extensive beating of the fibres. This treatment results in high costs for energy, both as beating energy and drying energy. A full-scale trial has been performed to investigate the role of the pulp with respect to energy demand and the barrier properties of the final papers. The paper made of 100% sulphite pulp with a low degree of beating showed the lowest energy consumption at a given level of barrier properties such as air permeance, grease resistance and water vapour transmission rate.

The papers produced in the full-scale trial have been used as substrates for coating. Greaseproof paper has a closed surface and should therefore be a good base paper for barrier coatings.

Chitosan has been used as a barrier coating because of its good oxygen barrier properties. Moreover, chitosan is a renewable material. Coating trials on a bench-scale showed that greaseproof paper can be upgraded to provide a good oxygen barrier. The oxygen barrier could not be achieved on a pilot-scale using the metered size press technique, because of the low coat weight applied.

The influence of the base paper on the barrier properties of chitosan-coated paper has been investigated. It was found that greaseproof paper is better than a paper with a higher porosity. The coating seemed to stay more on the surface of the greaseproof papers and to form a continuous coating layer with better barrier properties.

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Books on the topic "Barrier"

1

John D. [from old catalog] MacDonald. Barrier Island. New York: Ballantine Books, 1987.

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Russell, Eric Frank. Sinister Barrier. London: Methuen, 1986.

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Turksen, Kursad, ed. Permeability Barrier. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-1673-4.

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Turksen, Kursad, ed. Permeability Barrier. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-191-8.

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John D. [from old catalog] MacDonald. Barrier island. London: Hodder & Stoughton, 1987.

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Bates, Les. Quiet Barrier. Inverness: Kailyard Press, 2001.

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John D. [from old catalog] MacDonald. Barrier Island. New York: Knopf, 1986.

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John D. [from old catalog] MacDonald. Barrier Island. Boston, Mass: G.K. Hall, 1987.

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John D. [from old catalog] MacDonald. Barrier island. (Sevenoaks): New English Library, 1987.

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Hughes, Langston. The barrier. Alexandria, VA: Alexander Street Press, 2002.

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Book chapters on the topic "Barrier"

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Rausand, Marvin. "Barriers and Barrier Analysis." In Risk Assessment, 363–407. Hoboken, New Jersey: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118281116.ch12.

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Bird, Eric. "Barrier." In Encyclopedia of Earth Sciences Series, 179–82. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93806-6_26.

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Bird, Eric. "Barrier." In Encyclopedia of Earth Sciences Series, 1–4. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-48657-4_26-2.

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Hayes, Miles O., Eric Bird, Brian Greenwood, Karl F. Nordstrom, Robin Davidson-Arnott, Per Bruun, Edward J. Anthony, et al. "Barrier." In Encyclopedia of Coastal Science, 119–20. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3880-1_26.

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Rowe, R. K. "Barrier Systems." In Geotechnical and Geoenvironmental Engineering Handbook, 739–88. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1729-0_25.

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Wu, Weili, Zhao Zhang, Wonjun Lee, and Ding-Zhu Du. "Barrier Coverage." In Optimal Coverage in Wireless Sensor Networks, 159–81. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52824-9_10.

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Bloch, Michael H., Michael H. Bloch, Mark A. Geyer, David C. S. Roberts, Eileen M. Joyce, Jonathan P. Roiser, John H. Halpern, et al. "Hematoencephalic Barrier." In Encyclopedia of Psychopharmacology, 578. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-68706-1_3302.

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Cao, Zhuangqi, and Cheng Yin. "Barrier Tunneling." In Advances in One-Dimensional Wave Mechanics, 75–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40891-5_5.

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Merk, Hans F. "Barrier Skin." In Environment and Skin, 3–10. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-43102-4_1.

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Salih, Saif, and Charles Patrick Case. "Barrier Signalling." In Nanomedicine and Nanotoxicology, 245–58. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-55139-3_14.

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Conference papers on the topic "Barrier"

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Zhang, Yuan, and Evelyn Duesterwald. "Barrier matching for programs with textually unaligned barriers." In the 12th ACM SIGPLAN symposium. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1229428.1229472.

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Meyer, Stephen, and Eddie A. Krantz. "Risk-Informed Hazard Barrier Assessment." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49327.

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There are a number of hazard barriers installed in power plants. The removal of hazard barriers from service can currently require substantial plant resources to evaluate. These evaluations are usually performed to assess the impact of an open barrier on a plant’s licensing basis and fire protection program and are deterministic in nature. The risk-informed approach to hazard barrier assessment helps alleviate the constraints and manpower requirements imposed by the deterministic approaches currently used. A two-step approach has been developed for performing a risk-informed hazard barrier assessment. The objectives of the first step “Data Gathering” are to review the previously performed analyses and to perform the plant walkdowns and data collection needed for the study. In the second step “Model Development and Quantification” using the most recent Probabilistic Safety Assessment (PSA) system models and the results of the “Data Gathering” walkdowns, a set of fault tree/event tree models are prepared for each unique scenario or hazard to be evaluated. The overall set of barrier impairment impacts is binned into a smaller number of generic categories for the PSA analysis. The quantification results will enable utility management to manage the risk of taking barriers out of service and to make a determination of which barriers could be candidates for a risk-informed impairment out-of-service limit if desired.
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Hua, Jingyu, and Kouichi Sakurai. "Barrier." In the 27th Annual ACM Symposium. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2245276.2232011.

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Vinnem, Jan-Erik, and Ingrid B. Utne. "Risk Reduction for Floating Offshore Installations Through Barrier Management." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41112.

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Marine system accidents have a relatively high frequency worldwide. In Norwegian waters loss of installations has been avoided the last 20 years, but several near-misses and severe incidents confirm that the risk level is not insignificant. Barriers should prevent undesired events or reduce consequences should such events occur. The main purpose of barrier management is to establish and maintain the necessary barriers. It includes the processes, systems, solutions and measures needed to ensure implementation and follow-up of barriers. Petroleum Safety Authority has emphasized the need to develop barrier strategies during the last few years, and this has been particularly emphasized for topside systems and barrier functions to prevent and/or mitigate the consequences of hydrocarbon (HC) leaks. Insofar, the same focus on barrier management has not been put on marine systems and structural hazards. Risk associated with ballast systems, anchoring systems and dynamic positioning is at a level where further improvements should be made. Independent barrier elements and/or functions are required in order to provide substantial risk reduction. Some suggestions for independent barriers are discussed in this paper.
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Balestra, Lorenzo, Ruochen Yang, Ingrid Schjølberg, Ingrid B. Utne, and Øystein Ulleberg. "Towards Safety Barrier Analysis of Hydrogen Powered Maritime Vessels." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-60451.

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Abstract This paper focuses on the use of safety barrier analysis, during the design phase of a vessel powered by cryogenic hydrogen, to identify possible weaknesses in the architecture. Barrier analysis can be used to evaluate a series of scenarios that have been identified in the industry as critical. The performance evaluation of such barriers in a specific scenario can lead to either the approval of the design, if a safety threshold is met, or the inclusion of additional barriers to mitigate risk even further. By conducting a structured analysis, it is possible to identify key barriers that need to be included in the system, intended both as physical barriers (sensors, cold box) and as administrative barriers (checklist, operator training). The method chosen for this study is the Barrier and Operational Risk Analysis (BORA) method. This method, developed for the analysis of hydrocarbon releases, is described in the paper and adapted for the analysis of cryogenic hydrogen releases. A case study is presented using the BORA method, developing the qualitative barrier analysis. The qualitative section of the method can be easily adapted to vessels of different class and size adopting the same storage solution. The barrier analysis provides a general framework to analyze the system and check that the safety requirements defined by the ship operator and maritime certification societies are met.
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Nawaz, Zahid, and Pankaj Jain. "Barrier status panel: Tool for barrier management." In 2017 2nd International Conference on System Reliability and Safety (ICSRS). IEEE, 2017. http://dx.doi.org/10.1109/icsrs.2017.8272858.

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van Oort, Eric, Akshay Thombare, Munir Aldin, and Alex Lucas. "Annular Creep Barrier Evaluation and Qualification Using Ultrasonic Measurements." In IADC/SPE International Drilling Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/208782-ms.

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Abstract It is well-known that formations that exhibit active creep behavior under downhole conditions, such as reactive shales and mobile salts, can form annular barriers across uncemented or poorly cemented annular sections behind casing strings. Such creep barriers can simplify well abandonments, particularly in high-cost offshore environments. Evaluation and qualification of creep barriers in the field, however, have proven challenging and labor-intensive when casing is perforated and annular rock material is pressure-tested to verify its sealing ability. This work seeks to eliminate the need for pressure testing by allowing the barrier to be qualified using only cased-hole log measurements. Sophisticated rock mechanical lab experiments under realistic downhole conditions were conducted to investigate the formation of creep barriers by North Sea Lark shale. The experiments evaluated barrier formation while varying annular fluid chemistry and temperature. Measurement parameters included creep rate, pressure transmission across newly formed barriers, pressure breakthrough through the newly formed barriers, as well as ultrasonic responses by the shale. It was found that the Lark/Horda shale has a distinct anisotropic ultrasonic wave velocity profile that uniquely characterizes it. This can be used to identify its presence in an annular space when contacting the casing. A main conclusion is that a Lark shale barrier can be qualified through cased-hole sonic and ultrasonic logging alone without the need for pressure testing if: (1) the magnitude of the wave propagation velocity of the shale behind casing can be confirmed (2077 m/sec for Lark shale); (2) the characteristic velocity anisotropy profile, unique to the shale (~10.1% for Lark shale), can be verified; (3) good contact with / bonding to the casing is observed; and optionally (4) anisotropy in the time behavior of the shale contacting the pipe is observed when the barrier is formed / stimulated artificially. If these conditions are met, then our experiments show that the barrier will have excellent hydraulic sealing ability, with a permeability of a few micro-Darcy at most and a breakthrough pressure that approaches the minimum horizontal effective stress value. Additional findings are that shale heating will accelerate barrier formation but may damage the shale formation in the process. Extra-ordinary fast annular closure and barrier formation with evident shale re-healing was observed by using a concentrated KCl solution as pore fluid, showing the merits of barrier stimulation by chemical means. This result can be explained by considering the effect of solutes on shale hydration forces.
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Hamada, Eigai, Shoichi Morita, Ayumu Iiboshi, and Tetsuya Hiraishi. "Automatic Tsunami Barrier." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62575.

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Abstract The Anti-Tsunami Laboratory (ATL) invented and developed the Anti-Tsunami Door (ATD) barrier as an automatic tsunami barrier. In September 2018, ATL and Kyoto University tested a mid-scale model of a three-stage ATD unit and confirmed its performance: (1) functioning automatically (refer to Figure 9); (2) achieving reasonable wave height reduction, which is approximately 40%–80% that of a solid barrier of the same height; and (3) demonstrating reasonable strength for a wooden structure under the mid-scale model test conditions. ATL had planned to test a large-scale model of an ATD unit in Oregon State University in May 2020, but that test has been delayed owing to the COVID-19 pandemic. Because the wave pressure on the ATD unit is expected to be high during the large-scale model test, ATL requested that the Explosion Research Institute (ERI) simulate the wave pressure on a large-scale model ATD unit, and based on the results, ATL will reinforce the ATD unit. After testing the large-scale model unit, ATL will install ATD barriers along the coast of Japan, customizing the barrier for specific tsunami hazards.
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Volkov, Maxim, Asiya Zaripova, Sultan Sikander, Jamal Ezwai, Islam Altaeb, and Osama Elbouma. "Through Barrier Diagnostics to Locate Multiple Barrier Failures in Complex Well Failure Scenario and to Enable Successful P&A." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205938-ms.

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Abstract Objectives/Scope A 60-year-old well exhibited a leak at the surface and sustained annuli pressure (SAP) in all three annuli - A, B and C. The age of the well coupled with the symptoms suggested a complex multi-barrier failure scenario that needed to be diagnosed quickly and accurately so that the well could be secured safely. The paper shows how the comprehensive set of downhole diagnostics, including metal and cement barriers integrity assessment, aided in planning and execution of well intervention to secure the indicated failures. The well intervention team selected an approach to investigate the barriers status prior the rig came to the location. Surface diagnostics included evaluation of pressure trends, completion design, leak fluid composition and drilling records analysis which guided the selection of downhole survey. The input parameters for downhole through barrier diagnostics were: Downhole through barrier diagnostics targeted the evaluation of leak paths and failures in well barriers and included: This paper explores the concept, planning, execution and achieved results of the downhole diagnostics performed and how the results were implemented by Operator.
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Froehlich, Jon, Jacob O. Wobbrock, and Shaun K. Kane. "Barrier pointing." In the 9th international ACM SIGACCESS conference. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1296843.1296849.

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Reports on the topic "Barrier"

1

Freeman, H. D., and G. W. Gee. Hanford Protective Barriers Program asphalt barrier studies -- FY 1988. Office of Scientific and Technical Information (OSTI), May 1989. http://dx.doi.org/10.2172/6176115.

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Gay, David. Barrier Inference. Fort Belvoir, VA: Defense Technical Information Center, July 1997. http://dx.doi.org/10.21236/ada637072.

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Ng, K. Y. Stability of barrier buckets with zero RF-barrier separations. Office of Scientific and Technical Information (OSTI), March 2005. http://dx.doi.org/10.2172/15017223.

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Freeman, H. D., and G. W. Gee. Hanford protective barriers program: Status of asphalt barrier studies - FY 1989. Office of Scientific and Technical Information (OSTI), November 1989. http://dx.doi.org/10.2172/5450019.

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Arenstorf, Norbert S., and Harry F. Jordan. Comparing Barrier Algorithms. Fort Belvoir, VA: Defense Technical Information Center, September 1987. http://dx.doi.org/10.21236/ada211515.

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Nayee, Indra. LVBIED Barrier Project. Fort Belvoir, VA: Defense Technical Information Center, October 2012. http://dx.doi.org/10.21236/ada582797.

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Moses, K. Thermal barrier research. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/6931851.

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Reid, J. S., M. A. Nicolet, M. S. Angyal, D. Lilienfeld, Y. Shacham-Diamand, and P. M. Smith. Barrier/Cu contact resistivity. Office of Scientific and Technical Information (OSTI), October 1995. http://dx.doi.org/10.2172/119996.

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Blaskiewicz, M. BARRIER CAVITY LONGITUDINAL DYNAMICS. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/1151316.

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Bhattacharya, Rabi S. Advanced Thermal Barrier Coating. Fort Belvoir, VA: Defense Technical Information Center, April 2000. http://dx.doi.org/10.21236/ada381078.

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