Relevant bibliographies by topics / Uniform attachment

Academic literature on the topic 'Uniform attachment'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Uniform attachment.'

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.

Journal articles on the topic "Uniform attachment"

1

Gomez, Juan Pablo, Fabio Marcelo Peña, Valentina Martínez, Diana C. Giraldo, and Carlos Iván Cardona. "Initial force systems during bodily tooth movement with plastic aligners and composite attachments: A three-dimensional finite element analysis." Angle Orthodontist 85, no. 3 (September 2, 2014): 454–60. http://dx.doi.org/10.2319/050714-330.1.

Full text
Abstract:
ABSTRACT Objective: To describe, using a three-dimensional finite element (FE) model, the initial force system generated during bodily movement of upper canines with plastic aligners with and without composite attachments. Materials and Methods: A CAD model of an upper right canine, its alveolar bone and periodontal ligament, thermoformed plastic aligner, and two light-cured composite attachments were constructed. A FE model was used to analyze the effects of imposing a distal movement condition of 0.15 mm on the aligner (simulating the mechanics used to produce a distal bodily movement) with and without composite attachments. Results: In terms of tension and compression stress distribution, without composite attachments a compression area in the cervical third of the distal root surface and a tension area in the apical third of the mesial surface were observed. With composite attachments, uniform compression areas in the distal root surface and uniform tension area in the mesial root surface were observed. Compression areas in the active surfaces of the composite attachments were also observed. In terms of movement patterns, an uncontrolled distal inclination, with rotation axis between the middle and cervical root thirds, was observed without composite attachment. Distal bodily movement (translation) was observed with composite attachment. Conclusions: In a three-dimensional FE analysis of a plastic aligner system biomechanically supplementary composite attachments generate the force system required to produce bodily tooth movement; the absence of biomechanically supplementary composite attachments favors the undesired inclination of the tooth during the translation movements.
APA, Harvard, Vancouver, ISO, and other styles
2

Liu, Xuefeng, Jiawei Wan, Yansong Xiong, Songyue Liang, Yan Gao, and Zhiyong Tang. "Synthesis of Uniform CdSe Quantum Wires via Oriented Attachment." Journal of Nanoscience and Nanotechnology 15, no. 8 (August 1, 2015): 5798–806. http://dx.doi.org/10.1166/jnn.2015.9768.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Tanaka, Manabu, Kentaro Yamamoto, Tashiro Shinichi, and John J. Lowke. "Predictions of Current Attachment at Thermionic Cathode for TIG Arcs." Materials Science Forum 580-582 (June 2008): 319–22. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.319.

Full text
Abstract:
Study of current attachment at thermionic cathode for TIG arc at atmospheric pressure is attempted from numerical calculations of arc-electrodes unified model. The calculations show that the maximum temperature of arc plasma close to the cathode tip for W-2% ThO2 reaches 19,000 K and it is the highest value in comparison with the other temperatures for W-2% La2O3 and W-2% CeO2, because the current attachment at the cathode tip is constricted by a centralized limitation of liquid area of ThO2 due to its higher melting point. The calculations also show that, in cases of W- 2% La2O3 and W-2% CeO2, the liquid areas of La2O3 and Ce2O3 are widely expanded at the cathode tip due to their lower melting points and then produce uniform current attachments at the cathode. It is concluded that the current attachment at thermionic cathode is strongly dependent on work function, melting point and Richardson constant of emitter materials.
APA, Harvard, Vancouver, ISO, and other styles
4

Mousavi, Seiyed Ali Asghar Akbari, A. Halvaee, and R. Khanzadeh. "Experimental Investigations of Explosive Welding of Three-Layer Cylinder Composites-Part 1." Materials Science Forum 580-582 (June 2008): 323–26. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.323.

Full text
Abstract:
Study of current attachment at thermionic cathode for TIG arc at atmospheric pressure is attempted from numerical calculations of arc-electrodes unified model. The calculations show that the maximum temperature of arc plasma close to the cathode tip for W-2% ThO2 reaches 19,000 K and it is the highest value in comparison with the other temperatures for W-2% La2O3 and W-2% CeO2, because the current attachment at the cathode tip is constricted by a centralized limitation of liquid area of ThO2 due to its higher melting point. The calculations also show that, in cases of W- 2% La2O3 and W-2% CeO2, the liquid areas of La2O3 and Ce2O3 are widely expanded at the cathode tip due to their lower melting points and then produce uniform current attachments at the cathode. It is concluded that the current attachment at thermionic cathode is strongly dependent on work function, melting point and Richardson constant of emitter materials.
APA, Harvard, Vancouver, ISO, and other styles
5

Lyon, Merritt R., and Hosam M. Mahmoud. "Trees grown under young-age preferential attachment." Journal of Applied Probability 57, no. 3 (September 2020): 911–27. http://dx.doi.org/10.1017/jpr.2020.49.

Full text
Abstract:
AbstractWe introduce a class of non-uniform random recursive trees grown with an attachment preference for young age. Via the Chen–Stein method of Poisson approximation, we find that the outdegree of a node is characterized in the limit by ‘perturbed’ Poisson laws, and the perturbation diminishes as the node index increases. As the perturbation is attenuated, a pure Poisson limit ultimately emerges in later phases. Moreover, we derive asymptotics for the proportion of leaves and show that the limiting fraction is less than one half. Finally, we study the insertion depth in a random tree in this class. For the insertion depth, we find the exact probability distribution, involving Stirling numbers, and consequently we find the exact and asymptotic mean and variance. Under appropriate normalization, we derive a concentration law and a limiting normal distribution. Some of these results contrast with their counterparts in the uniform attachment model, and some are similar.
APA, Harvard, Vancouver, ISO, and other styles
6

Luo, Yi, Yadong Zhou, Shengli Zou, and Jing Zhao. "Dielectric domain distribution on Au nanoparticles revealed by localized surface plasmon resonance." Journal of Materials Chemistry C 6, no. 44 (2018): 12038–44. http://dx.doi.org/10.1039/c8tc02944j.

Full text
Abstract:
The LSPR of Au nanospheres shows almost no shift in the extinction spectrum with attachment of a silica domain but considerable shift with a uniform layer of silica, indicating LSPR can be used to differentiate the segregated/uniform dielectric distribution.
APA, Harvard, Vancouver, ISO, and other styles
7

Sun, Shen Shen. "Vessel Attachment Nodule Segmentation Based on Mean-Shift and EM." Advanced Materials Research 204-210 (February 2011): 589–95. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.589.

Full text
Abstract:
For solving the segmentation problem of vessel attachment nodule, a new adaptive bandwidth chosen method based on EM is proposed and apply it into Mean-shift algorithm to segment vessel attachment nodule. This method has some advantages such as time low complexity and correct bandwidth when comparing it to the method of bandwidth chosen based on statistical analysis rule or optimized rule, Imposing the vertical orientation vectors of vessel’s gradient submitting to normal distribution and the vertical orientation vectors of nodule’s gradient submitting to uniform distribution, modeling the nodule connected vessel, and estimating model parameter by EM, extract bandwidth parameter in Mean-shift based on the weight of uniform distribution. The proposed method was tested on synthetic data set and the clinical chest CT volumes, and all the results were correct. The results revealed that the proposed method is successful in segmentation lung vessel attachment nodule.
APA, Harvard, Vancouver, ISO, and other styles
8

Lee, Mikyun, and Yoonsun Heo. "The effect of the Uniform Components on Uniform satisfaction and Attachment to Department : Focusing on Airline-service majored Students." Journal of Tourism Management Research 24, no. 7 (December 31, 2020): 309–26. http://dx.doi.org/10.18604/tmro.2020.24.7.15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Lee, Mikyun, and Yoonsun Heo. "The effect of the Uniform Components on Uniform satisfaction and Attachment to Department : Focusing on Airline-service majored Students." Journal of Tourism Management Research 24, no. 7 (December 31, 2020): 309–26. http://dx.doi.org/10.18604/tmro.2020.24.7.15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Jawad, M. H., E. J. Clarkin, and R. E. Schuessler. "Evaluation of Tube-to-Tubesheet Junctions." Journal of Pressure Vessel Technology 109, no. 1 (February 1, 1987): 19–26. http://dx.doi.org/10.1115/1.3264850.

Full text
Abstract:
The strength of tube-to-tubesheet joints is influenced by many factors such as method of attachment, details of construction, and material property. In this report three methods of attachment are investigated. They are uniform expansion, mechanical rolling, and welding. Details of construction studied in this report are: the finish of tubesheet hole surface; grooved versus ungrooved tubesheets; and groove geometry. The effect of material property on the joint strength was investigated for carbon steel and titanium tubes attached to carbon steel tubesheet. The results indicate that a theoretical prediction of the behavior of joints is feasible for various materials, methods of attachment, and details of construction.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Uniform attachment"

1

Luo, Hongwei, and Hongwei luo@rmit edu au. "Modelling and simulation of large-scale complex networks." RMIT University. Mathematical and Geospatial Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080506.142224.

Full text
Abstract:
Real-world large-scale complex networks such as the Internet, social networks and biological networks have increasingly attracted the interest of researchers from many areas. Accurate modelling of the statistical regularities of these large-scale networks is critical to understand their global evolving structures and local dynamical patterns. Traditionally, the Erdos and Renyi random graph model has helped the investigation of various homogeneous networks. During the past decade, a special computational methodology has emerged to study complex networks, the outcome of which is identified by two models: the Watts and Strogatz small-world model and the Barabasi-Albert scale-free model. At the core of the complex network modelling process is the extraction of characteristics of real-world networks. I have developed computer simulation algorithms for study of the properties of current theoretical models as well as for the measurement of two real-world complex networks, which lead to the isolation of three complex network modelling essentials. The main contribution of the thesis is the introduction and study of a new General Two-Stage growth model (GTS Model), which aims to describe and analyze many common-featured real-world complex networks. The tools we use to create the model and later perform many measurements on it consist of computer simulations, numerical analysis and mathematical derivations. In particular, two major cases of this GTS model have been studied. One is named the U-P model, which employs a new functional form of the network growth rule: a linear combination of preferential attachment and uniform attachment. The degree distribution of the model is first studied by computer simulation, while the exact solution is also obtained analytically. Two other important properties of complex networks: the characteristic path length and the clustering coefficient are also extensively investigated, obtaining either analytically derived solutions or numerical results by computer simulations. Furthermore, I demonstrate that the hub-hub interaction behaves in effect as the link between a network's topology and resilience property. The other is called the Hybrid model, which incorporates two stages of growth and studies the transition behaviour between the Erdos and Renyi random graph model and the Barabasi-Albert scale-free model. The Hybrid model is measured by extensive numerical simulations focusing on its degree distribution, characteristic path length and clustering coefficient. Although either of the two cases serves as a new approach to modelling real-world large-scale complex networks, perhaps more importantly, the general two-stage model provides a new theoretical framework for complex network modelling, which can be extended in many ways besides the two studied in this thesis.
APA, Harvard, Vancouver, ISO, and other styles
2

Shu-hui, Hsu, and 許淑惠. "The Effect of Incongruent Financial Jobholders Uniform on Purchase intention Research：The Moderating Effect of Group Attachment and Product Involvement." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/34478585219405593550.

Full text
Abstract:
碩士
輔仁大學
織品服裝學系
94
While clients step into banking institution, first glance is those decorations at lobby, next view coming into eyes is banking clerks who wear monotonous uniform. This is because of that banking institutions would like to show clients their positive images as well as the characters of “conservative”, “reliability”, “profession”, “integrity” and “moral fibre”, thus most of those banking uniforms are always by dark-color suits. Nowadays, the community we are living at is a diversified society. Consumers gradually have many chances to touch the more and more innovative information technology wildly. Banking uniforms therefore should need to be variegated too. That is also the purpose of what this research is going to probe into and to make understanding about. Apparel always is the “primacy effect” (David J. Lieberman, Ph.D., 2001) whenever banking employee is to show whether they place importance on clients. “Primacy effect” is a very important factor. After all, “banking institution” is a standard service industry as it has to contact and communicate with clients face to face. So, other than professional knowledge, exteriority is the significant criteria for selecting banking employees. Through this research, it is clearly to understand that banking clerks do affect client’s purchasing intention, in terms of under the conditions of wearing different traditional uniform as well as having differential knowledge of banking products. In this research, it was going by an experimental method. Through the way of virtual reality, to imitate the influence on clients’ purchasing intention when banking clerks were with various uniforms. Testees were collected from the multitudes and the test was going by random sampling. The researching result appeared: 1.In terms of that banking clerks wear uniform, which is completely different with the basic mode of uniform, it led to consumers confusion and discomfort. 2.In terms of that male banking clerks wear the uniform of which does not conform to the monotonous and basic mode of uniform, consumers’ purchasing intention declined, contrariwise. 3.To those consumers who only need simplified banking products, it is expected that banking clerks can wear monotonous and basic uniform.
APA, Harvard, Vancouver, ISO, and other styles
3

Yang, Chin-Sheng, and 楊金生. "Bending vibrations for an elastically restrained rotating non- uniform Timoshenko beam with attachments." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/14300587636178480035.

Full text
Abstract:
碩士
國立成功大學
機械工程研究所
81
By the theorem of Hamilton to the problem of bending vibra- tions for an elastically restrained rotating nonuniform Timo- shenko beam with attachments in this paper,the coupled differen- tial governing equations of an nonuniform Timoshenko beam are reduced into two complete forth-order differential governing eq- uations with variable coefficients in the flexural displacement or in the angle of rotation due to bending ,respectively.The ex- plicit relation between the flexural displacement and the angle of rotation due to bending is established . The frequency equa- tions of the beam with a general elastically restrained root are derived and expressed in terms of the four normalized fundamen- tal solutions of the associated governing differential equations . Consequently ,if the geometric and material properties of the beam are in polynomial form ,then by the method of Frobenius the exact solution for the problem can be obtained. First, considering the dimensionless length of a rotating beam shorter than the radius of the rigid ring , as the rotating beam in all compression due to the centrifugal force , it is ob- served that setting angle , taper ratio and elastic constraint have the influence on the natural frequencies. Second, an nonuniform Timoshenko beam with the variance of length of the rotating beam has the influence on the critical rotating speed.Third,the variance of the tip mass given on which end of a rotating nonuniform beam , it has the influence on the natural frequencies. Finally, a rotating beam clamped at the ri- gid ring which radius is shorter than the length of the beam is partly in compression and partly in tension. Until now only con- sidered , a uniform Bernoulli-Euler beam that clamped at the ri- gid ring has a constant setting angle and rotating speed.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Uniform attachment"

1

Organisation pour l'harmonisation en Afrique du droit des affaires. Code OHADA: (acte uniforme) des procédures simplifiées de recouvrement et des voies d'exécution : annoté. [Dakar]: Editions juridiques africaines, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Organisation pour l'harmonisation en Afrique du droit des affaires. OHADA: Acte uniforme relatif au droit commercial général, 1998. Dakar, Sénégal: Editions Comptables et juridiques, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Organisation pour l'harmonisation en Afrique du droit des affaires. OHADA: Acte uniforme portant organisation des procédures collectives d'apurement du passif, 1998. Dakar, Sénégal: Editions Comptables et juridiques, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Organisation pour l'harmonisation en Afrique du droit des affaires. OHADA: Traité et actes uniformes commentés et annotés. 2nd ed. [Porto-Novo, Benin]: Juriscope, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Organisation pour l'harmonisation en Afrique du droit des affaires. OHADA: Traité et actes uniformes commentés et annotés. [Porto-Novo, Benin]: Juriscope, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Organisation pour l'harmonisation en Afrique du droit des affaires. OHADA: Acte uniforme portant organisation des procédures simplifiées de recouvrement et des voies d'exécution, 1998. Dakar, Sénégal: Editions Comptables et juridiques, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Gibson, James L., and Michael J. Nelson. The Legal System and Its African American Constituents. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190865214.003.0001.

Full text
Abstract:
Despite popular reports that the legal system is in a state of crisis with respect to its African American constituents, research on black public opinion in general is limited owing to the difficulty and expense of assembling representative samples of minorities. We suspect that the story of lagging legal legitimacy among African Americans is in fact quite a bit more nuanced than is often portrayed. In particular, black public opinion is unlikely to be uniform and homogeneous; black people most likely vary in their attitudes toward law and legal institutions. Especially significant is variability in the experiences—personal and vicarious—black people have had with legal authorities (e.g., “stop-and-frisk”), and the nature of individuals’ attachment to blacks as a group (e.g., “linked fate”). We posit that both experiences and in-group identities are commanding because they influence the ways in which black people process information, and in particular, the ways in which blacks react to the symbols of legal authority (e.g., judges’ robes).
APA, Harvard, Vancouver, ISO, and other styles
8

Acte uniforme portant organisation des procédures simplifiées de recouvrement et des voies d'exécution. [Dakar?: s.n., 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Organisation pour l'harmonisation en Afrique du droit des affaires. OHADA: Acte uniforme relatif au droit commercial general, 1998 (Praticien). Editions Comptables et juridiques, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

affaires, Organisation pour l'harmonisation en Afrique du droit des. OHADA: Acte uniforme portant organisation des procedures collectives d'apurement du passif, 1998 (Praticien). Editions Comptables et juridiques, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Uniform attachment"

1

Penslar, Derek J. "Epilogue." In Jews and the Military. Princeton University Press, 2013. http://dx.doi.org/10.23943/princeton/9780691138879.003.0009.

Full text
Abstract:
This epilogue argues that over the century and a half, from the French revolutionary wars to World War II, Jews in military service were carriers of multiple, overlapping, and at times clashing identities. They often felt a sincere, profound attachment to their homeland and fought with no sense of qualitative difference from their countrymen. Believing that their homeland epitomized toleration and respect for human dignity, Jews in western Europe and North America defined their countries' wars as Jewish wars. Moreover, Jews celebrated their men in uniform not only for their virility and bravery, not only for fulfilling their patriotic duty, but also for boldly asserting their religious particularism. The Jewish soldier at a Sabbath service in the field or a synagogue at home brought glory to his community not simply because he donned his uniform and decorations but because he did so while occupying a manifestly Jewish space.
APA, Harvard, Vancouver, ISO, and other styles
2

Smith, Adam S., Kelly Lei, and Zuoxin Wang. "The Neurobiology of Social Attachment." In Neurobiology of Mental Illness, edited by Dennis S. Charney, 1112–26. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199934959.003.0086.

Full text
Abstract:
Social attachment is an intrinsic component of human life. As Aristotle famously noted, “man is by nature a social animal”, and as such, social attachments are wellsprings for our survival, success, and mental health. This dynamic process – involving complex behaviors, multimodal sensory information, and cognitive processes – leads infants to bond to their caregivers or two people to fall in love. Now, the neurobiological basis of attachment is coming to light, illuminating the role of various monoamines and neuropeptides. It is the goal of this chapter to describe the current knowledge of the neurobiology behind social attachments by uncoupling the neurochemical and neuroanatomy of individual bond-related behaviors, reconstructing uniformed neural systems, and correlating these findings to our understanding of human analogs.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Uniform attachment"

1

Rochat, Judith L., and Victor W. Sparrow. "Incorporating Compressional and Shear Wave Types Into Fuzzy Structure Models for Plates." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0413.

Full text
Abstract:
Abstract Although realistic complex structures are usually difficult to model theoretically, fuzzy structure theory enables one to produce such a model without a detailed knowledge of the entire structure. Using the theory established by Pierce et al. [A. D. Pierce, V. W. Sparrow, and D. A. Russell, J. Vib. Acoust. (to be published), also ASME 93-WA/NCA-17.] regarding fundamental structural-acoustic idealizations for structures with imprecisely known or fuzzy internals, the effects that fuzzy attachments have on different wave types in a primary (or master) structure are examined in this paper. In the theory by Pierce et al., the primary structure that undergoes vibrations is a thin plate mounted in an infinite baffle. On one side of the plate are fuzzy attachments, represented as an array of attached mass-spring-dashpot systems, which are excited by an incident plane pulse. This known theory explains the effects of these attachments on bending waves in the plate. In this paper, the theory is extended to isolated compressional and shear waves in a plate. While studying this new problem, it is discovered that coupling effects occur when the plate and attachment properties are not uniform in the direction perpendicular to the wave propagation. Hence, unlike the bending wave theory which models a finite thin plate with point attached oscillators, the new wave type theory uses a thin plate infinite in one direction with line attached oscillators also infinite in the same direction. For both the compressional and shear waves, it is found that the fuzzy attachments add an apparent frequency dependent mass and damping to the plate. These results are similar to those for the bending wave theory.
APA, Harvard, Vancouver, ISO, and other styles
2

Laveau, Benoit, Reza S. Abhari, Michael E. Crawford, and Ewald Lutum. "High Resolution Heat Transfer Measurement Technique on Contoured Endwall With Non-Uniform Thermal Resistance." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43639.

Full text
Abstract:
The introduction of endwall contouring in the design of modern gas turbines has helped to improve the aerodynamic performance. In fact, the management of secondary flows and the control of purge air flow are limiting the generation of losses and enhancing the use of coolant air. The impact of such geometrical features on the endwall thermal loads is then of primary interest for designers in charge of optimizing the cooling of the components and ensuring their mechanical integrity. This paper focuses on heat transfer measurement on a contoured vane endwall installed in an axial turbine. The measurements were performed on a dedicated platform installed in the axial turbine rig of ETH Zurich, using a quasi-isothermal boundary condition and an infrared camera traversed by a multi-axis robot-arm. Due to the complex geometry, a mis-attachment of the insulating Kapton layer was observed in several regions of the passage and corrupted the measurements of about 20% of the endwall. An experimental correction method based on the surface response to laser step heating was developed. A specific setup was constructed and used to map the surface response of a calibration plate with flat bottom holes and the heat transfer platform. A model linking the response to the bubble thickness was obtained and used to successfully correct the results. The heat transfer data were obtained for two turbine operating conditions at ReCax = 720000 and 520000. The correction technique, commonly used for defects detection, has been applied in a quantitative manner to provide successful correction of the measurements for different operating conditions.
APA, Harvard, Vancouver, ISO, and other styles
3

Oosthuizen, Patrick H. "Natural Convection in a Square Enclosure With a Partially Heated Wall Section Covered by a Blind-Like Attachment in Which There Is a Linearly Varying Heat Generation Rate." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32968.

Full text
Abstract:
Natural convective heat transfer across a square enclosure with one vertical wall partially heated to a uniform high temperature and with the opposite vertical wall cooled to a lower uniform temperature has been numerically investigated. The remaining wall sections are adiabatic. The heated wall section is covered at the top and in the front by thin straight walls that offer no resistance to heat transfer. There is heat generation in vertical portion of this covering wall that is parallel to the heated wall section. The present work was undertaken as part of a wider study of the effect of window coverings on the heat transfer rate from windows, particularly for the case where the window is hotter than the room air. The situation being considered here is an approximate model of a window covered by a plane (roller) blind. In such situations there is often effectively heat generation in the blind as a result of the absorption of solar radiation. However, because of the sun angle and the effect of building overhangs, this heat generation is often not uniform along the blind. To study this effect, the case where there is a linearly varying rate of heat generation in the barrier (the “blind”) with the highest rate of heat generation at the bottom of the barrier and with no heat generation at the top has been considered. The flow in the enclosure has been assumed to be laminar and two-dimensional. Fluid properties have been assumed constant except for the density change with temperature that gives rise to the buoyancy forces. The governing equations have been written in dimensionless form and have been solved using a finite-element method. The solution has the Rayleigh number, the Prandtl number, the dimensionless distance of the barrier from the hot vertical surface, the mean dimensionless rate of heat generation in the barrier, and the dimensionless size of the heated wall section as parameters. Results have only been obtained for a Prandtl number of 0.7. The effect of the other dimensionless variables on the heat transfer rate from the hot wall section has then been numerically determined.
APA, Harvard, Vancouver, ISO, and other styles
4

Subbarao, Rayapati, and M. Govardhan. "Studies on the Outline of Flow Improvement With Speed Ratio in a Counter Rotating Turbine." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2636.

Full text
Abstract:
Abstract Flow through the Counter Rotating Turbine (CRT) stage is more complex due to the presence of two rotors that rotate in the opposite direction, the spacing between them and the tip clearance provided on rotors. This flow aspect may change, if we change the parameters like speed, spacing and blade angles. Current effort contains simulation studies on the flow topology of CRT through dissimilar speed ratios in the range of 0.85–1.17. CRT components stator and the rotors are modelled. At nozzle inlet, stagnation pressure boundary condition is used. At the turbine stage or rotor 2 outlet, mass flow rate is specified. Skin friction lines are drawn on rotor 1 as well as rotor 2 on all over the blade. Not much variation of skin friction lines is witnessed in rotor 1 on the pressure side with exception to the position of the separation line close to leading edge. On suction side, skin friction lines are more uniform when the speed ratio is greater than 1. Skin friction lines on rotor 2 pressure surface show the presence of re-attachment lines. The position of the nodal point of separation near the hub remained same, but the strength is decreasing with speed ratio. On rotor 2 suction side, near the tip, all along the stream wise direction, line of re-attachment is observed that spreads from leading edge to trailing edge, whose strength is varying with speed ratio. Near the hub as well, line of re-attachment is observed, which is of more intensity in lower speed ratios. For the same region in rotor 1, there is proper reattachment as nodes are observed instead of lines, suggesting that more improved flow is occurring in rotor 1 than rotor 2. Thus, the present paper identifies the flow modification with speed ratio in a counter rotating turbine. Also, effort is made to see the consequence of flow change on the output of CRT.
APA, Harvard, Vancouver, ISO, and other styles
5

Toloui, Mostafa, Mark Marshall, Pierce Vatterott, Peter Zhang, Ryan Lahm, Thomas Lulic, and Megan Harris. "Numerical Modeling of Vascular Stresses During Lead Extraction: Subclavian vs. Femoral." In 2020 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dmd2020-9003.

Full text
Abstract:
Abstract Transvenous lead extraction is a critical and growing technique used to treat patients with chronically implanted pacemakers and defibrillators. This procedure is commonly executed via the subclavian vein or the femoral vein. Some physicians’ experiences indicate that the femoral approach results in fewer vascular tears. This study is aimed to present a physics-based comparative assessment of intravenous mechanical stresses for chronic lead management between the two approaches. Finite Element (FE) modeling is employed to quantify the vascular stress distributions. A full 3-D model including veins, heart, fibrotic scar regions and the lead was created to simulate the different lead extraction methods. Results: (1) highest stresses are generally in the vicinity of SVC lead attachments; (2) femoral approach results in a ∼uniform distribution of stress over the scar while the subclavian approach leads to patches of concentrated high stress; (3) 2–3 times higher maximum vascular stress during subclavian; (4) insignificant maximum stress at the apex for both; (5) inverse variation of stress levels with: (i) branch-to-scar distance for SVC method; and (ii)vein wall thickness in both methods. (6) lower stress levels for scars with longer attachment lengths. The importance and effectiveness of mechanical stress analysis in risk analysis for chronic lead management is illustrated. Overall, the localized intravascular wall stress is meaningfully higher for subclavian vs. femoral extraction with same SVC shear force. This may help explain the higher rate of SVC tears when extracting from the left subclavian approach. The individual anatomy (e.g. vascular angles) is a key factor in the resulting stress and this understanding may be critical when choosing an extraction approach and future lead design.
APA, Harvard, Vancouver, ISO, and other styles
6

Figueroa, C. Alberto, Seungik Baek, Jay D. Humphrey, and Charles A. Taylor. "Incorporating the Effects of Variable Wall Properties in Large-Scale Deformable Models of the Cardiovascular System." In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176686.

Full text
Abstract:
Numerical simulation of blood flow in arteries has important applications in disciplines such as surgical planning, medical device design, and disease research. However, there are many challenges involved in accurately characterizing the motion of blood within the arterial system. First, computational models can require finite element meshes with several million degrees of freedom. Furthermore, surgical planning applications require solving these problems as quickly as possible. Second, the boundary conditions must faithfully represent the flow and pressure characteristics of the vascular trees external to the computational model. These conditions must also be consistent with the intrinsic wave propagation phenomena within the model. Third, the fluid-solid interactions between blood, vessel wall and surrounding tissues and organs need to be modeled. In order to represent the pulsation of blood within arteries, one must consider the variations in arterial compliance (especially significant when dealing with large models), points of attachment of the vessels to the surrounding organs, etc. Prior vascular fluid-structure interaction models have considered uniform vessel wall properties and a zero pressure reference state.
APA, Harvard, Vancouver, ISO, and other styles
7

Shargay, Cathleen, Anil Singh, Tim Munsterman, and Les Antalffy. "Coke Drum Design and Fabrication Issues." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25765.

Full text
Abstract:
There are numerous design, materials and fabrication issues which significantly affect the cost, reliability and life of coke drums. Primarily in a pros and cons narrative, this paper discusses many of these critical decisions. It first outlines the potential damage mechanisms resulting from coke drum operation, which are primarily thermal fatigue and bulging and also embrittlement, sulfidation and erosion. Delayed Coking operation is described along with the ever present desire by owners to shorten cycle times to maximize unit throughput. Some examples of the decisions include the choices of alloys for base metals, cladding, and weld overlay, and the desire to maximize postweld heat treatment (PWHT) cycles while maintaining Minimum Design Metal Temperature (MDMT) toughness requirements to permit multiple future drum weld repairs. Design issues are reviewed such as uniform versus stepped thickness wall designs, and preferential placement of shell/cone plates to their optimum locations in relation to their individual thicknesses and yield strengths. Skirts also have options in attachment designs, thicknesses and the use of keyholes. The discussion of these and numerous other issues will hopefully assist the industry in the current development of a technical standard on coke drums being done by the American Petroleum Institute (API).
APA, Harvard, Vancouver, ISO, and other styles
8

Faal-Amiri, Asgar, Amir Salehzadeh, Jacky Shoulders, and Peng Yuan. "Main Steam Line Break Loads on BWR and ABWR Steam Dryer." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28437.

Full text
Abstract:
In a boiling water reactor (BWR) and advanced boiling water reactor (ABWR) a main steam line pipe rupture in the main steam piping system, hereafter called main steam (MS) line, will create a decompression wave and a pressure disturbance that moves through the MS line toward the reactor pressure vessel (RPV). It expands into a large region transmitting a compression wave at acoustic speed and spreads as an acoustic wave over the adjacent dryer plate. The initial acoustic pressure force on the dryer is expected to spread from an origin at the steam line attachment. It reflects back toward the RPV wall and again to the dryer until it dissipates. This is expected in a space that is not of uniform spacing because the dryer surface is nearly flat and the vessel wall is a curved surface. The acoustic load region is bounded by the steam dryer outer surface and RPV inner wall surfaces. In this paper, simplified, conservative modeling is applied in this approach to obtain reasonable bounding loads. The method is compared against the result of a detailed fine-structure Computation Fluid Dynamic (CFD) analysis using the same input data. Therefore, the simplified method may be used to quickly estimate conservative decompression forces on a dryer surface.
APA, Harvard, Vancouver, ISO, and other styles
9

Cairo, Ronald R., and Kathleen A. Sargent. "A Scientific Approach to the Process Development of Bonded Attachments for High Speed Rotor Application." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0355.

Full text
Abstract:
The quest for increased work per stage of compression to reduce overall gas turbine engine system cost has placed extreme demands on the high-pressure turbine (HPT) system. As an example, the HPT is required to operate at unprecedented levels of AN2 (the product of turbine annulus area and mechanical speed squared) to enable compressor performance goals to be met. The typical approach of mechanically attaching blades via firtree or dovetail configured mechanical attachments, limits rotor speed because of the life limiting broach slots (stress concentrators) in the disk rim. Exacerbating this problem is the fact that the disk lugs, which react the blade loading, impose a dead load. Higher disk speed results in higher blade loading requiring a deeper or wider lug to support the blade. This in turn results in a wider disk bore to support the deeper, dead load lug region. The dilemma is that higher speed results in larger stress concentrations at the rim and a wider disk bore to support the added parasitic rim load. The answer to this dilemma lies in creating an Integrally Bladed Rotor (IBR) in which the blades are integral with the disk. Since typically, for an HPT, the blades are single crystal and the disk equiaxed nickel alloys, the IBR design suggested precludes absolute machining as the fabrication approach. A solution lies in metallurgically bonding the blades to the disk rim. Bonded airfoil attachments have the potential to increase AN2 and component life by 9–10% by eliminating broach induced stress concentrations as noted. Moreover, bonded attachments can reduce external rim loading by upward of 15% with a corresponding reduction in disk weight. The key to the solution is a controlled, economical process to concurrently join a full complement of HPT blades in a repeatable manner. This paper discusses how a scientific approach and creative design practice can lead to such a process. Three alternative tooling concepts, and one universal tool that allows independent use of two of these concepts, were developed. Tool stresses and deflections, tool load paths, and bond pressure profiles were all quantified through ANSYS Finite Element Analyses and closed form analytical solutions. Prior experience has shown that joint strength is sensitive to the bond pressure level. Therefore, the tool materials and geometry were iterated upon until the pressure applied to the blade bond plane was as uniform as possible. Since absolute uniformity is elusive when deformable bodies are part of the bond load train, accurately determining the maximum and minimum bond plane pressure is absolutely essential for subsequent joint characterization and design allowable determination. This allows localized working stresses in the designed attachment to be compared to specific, bond pressure driven, allowable strengths rather than an average strength. This paper will show how applying a scientific approach to the development of a critical technology process can reduce both the cost and risk of process development.
APA, Harvard, Vancouver, ISO, and other styles
10

Baldino, Filippo, and Mohammad E. Taslim. "Experimental Film Cooling Effectiveness of Multi-Row Patterns on Flat and Step-Down Surfaces." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90108.

Full text
Abstract:
Abstract Multiple rows of film cooling holes have been widely used for the protection of gas turbine airfoils and other hot sections. In the common approach, however, the streamwise surfaces between the film holes may not receive enough protection. The objective of this research was to overcome this issue by introducing a new layout of film cooling, the step-down surfaces. Pressure-sensitive paint technique was used to test three pairs of geometries. Each pair consists of a flat and a step-down surface for back to back comparisons, under otherwise identical conditions. Two rows of 30° angled cylindrical holes of 3.175 mm diameter, exiting at the step bottom corner, introduced the coolant to the surface. Two spanwise pitch-to-diameter ratios of 2 and 4, two row distance to hole diameter of 4 and 8, four blowing ratios of 0.25, 0.5, 0.75 and 1, all at a constant density ratio of 1 were tested. Adding a step-down of the order of 0.8 hole-diameter proved to significantly increase the overall film cooling effectiveness. Two major improvements compared to a flat surfaces were observed: (a) longer streamwise film cooling effectiveness (b) more uniform spanwise distribution of coolant. The main reason of all the improvements is the aerodynamic phenomenon governing the flow evolution, the Coanda effect. The latter, indeed, enhances the flow attachment to the airfoil surface downstream the step.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Uniform attachment' for particular source types:
Journal articles
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!

To the bibliography