Relevant bibliographies by topics / Frontal walls

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  2. Dissertations / Theses
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Academic literature on the topic 'Frontal walls'

Author: Grafiati
Published: 9 September 2021
Last updated: 18 February 2022

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Journal articles on the topic "Frontal walls"

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Alekseeva, Victoriia. "ANATOMICAL PREDICTIONS OF DEVELOPMENT OF RHINOSINUSITIS AND ITS COMPLICATIONS." Inter Collegas 7, no. 3 (November 24, 2020): 125–30. http://dx.doi.org/10.35339/ic.7.3.125-130.

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Background. The anatomical structure of the paranasal sinuses of a person predetermines the risk of development, diversity of presentation, possibility of complications and features of surgical treatment of rhinosinusitis. Objective: of our study was to determine the thickness and density of the walls of the maxillary and frontal sinuses, which are potentially dangerous in terms of the development of complications. Materials and methods: Our study involved 121 subjects without any ENT diseases, who underwent SCT examination due to the reasons that were not related to abnormalities of ENT organs. Thickness and density in the region of the lower (orbital) wall and posterior (cerebral) wall of the frontal sinus were calculated. Results and Discussion: The maximum density was characteristic of the lower wall of the frontal sinus under physiological conditions and appeared 107.96 ± 201.64 Hu, the minimum for the lower wall was -29.98 ± 208.54 Hu. The thickness of the bone tissue in the frontal sinus was 4.05 ± 2.04 mm. Conclusion: The minimum density and thickness of the lower and posterior walls of the frontal sinus and upper and lower walls of the maxillary sinus was established under physiological conditions. The density of the posterior wall was found to be 25.4% lower than the density of the lower wall, and the thickness 22.2% lower.
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Pesic, Zoran, Dragan Petrovic, Sladjana Petrovic, and Nikola Buric. "The relationship between clinical findings and therapeutic approach in the treatment of fractured frontal sinus walls." Srpski arhiv za celokupno lekarstvo 135, no. 11-12 (2007): 639–44. http://dx.doi.org/10.2298/sarh0712639p.

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Introduction The incidence of fractured frontal sinus walls vary from 6% to 12% of all craniofacial injuries. Objective Estimated relation between clinical findings and performed therapeutic procedures in treating fractured frontal sinus walls. To estimate success in performed therapeutic procedures, according to the incidence of postoperative complications and the integrity of injured regions from the functional and esthetical aspect. Method We analyzed, by retrospective clinical investigation, 19 patients with fractured frontal sinus walls and dislocated fragments, treated at the Department for Maxillofacial Surgery, Clinic of Dentistry in Nis, in the period March 1995 - March 2006. The success of therapy was estimated based on the incidence and type of complications and esthetical results in relation to preoperative findings. Results Predominant etiological factor in fractures of frontal sinus walls is trauma sustained in traffic accidents, which occurred in 52.6% of patients in our investigation. In clinical findings, the impression was the predominant sign, present in 16 patients. In 6 cases soft tissue access through already present lacerations or their extensions was employed, in 4 cases it was done by supraciliary access and in 9 by bicoronal access. As a therapeutic measure, drainage was performed in 5 cases, cranialisation in one, ostheoneogenetic access in 11 cases and a simple reposition of fragments in 2 patients with fractured frontal sinus walls. Infection as a complication was absent. All patients were satisfied with postoperative esthetical appearance of the injured region. Conclusion The infection, the lacerations and the direction of fractured lines are dominant factors in the determination of therapeutic procedures used to treat fractured frontal sinus walls. This will result in the low incidence of infection as a postoperative complication and in patient?s satisfaction with postoperative esthetical result of the injured region.
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Meireles, Helena, Rita Bento, Serena Cattari, and Sergio Lagomarsino. "A hysteretic model for “frontal” walls in Pombalino buildings." Bulletin of Earthquake Engineering 10, no. 5 (June 26, 2012): 1481–502. http://dx.doi.org/10.1007/s10518-012-9360-0.

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Kelishadi, Shahrooz S., Matthew R. Zeiderman, Karan Chopra, Joseph A. Kelamis, Gerhard S. Mundinger, and Eduardo D. Rodriguez. "Facial Fracture Patterns Associated with Traumatic Optic Neuropathy." Craniomaxillofacial Trauma & Reconstruction 12, no. 1 (March 2019): 39–44. http://dx.doi.org/10.1055/s-0038-1641172.

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Traumatic optic neuropathy (TON) is rare. The heterogeneity of injury patterns and patient condition on presentation makes diagnosis difficult. Fracture patterns associated with TON have never been evaluated. Retrospective review of 42 patients diagnosed with TON at the R. Adams Cowley Shock Trauma Center from May 1998 to August 2010 was performed. Thirty-three patients met criteria for study inclusion of fracture patterns. Additional variables measured included patient demographics and mechanism. Cluster analysis was used to form homogenous groups of patients based on different fracture patterns. Fracture frequency was analyzed by group and study population. Visual depiction of fracture patterns was created for each group. Cluster analysis of fracture patterns yielded five common “groups” or fracture patterns among the study population. Group 1 ( n = 3, 9%) revealed contralateral lateral orbital wall (100%), zygoma (67%), and nasal bone (67%) fractures. Group 2 ( n = 7, 21%) demonstrated fractures of the frontal bone (86%), nasal bones (71%), and ipsilateral orbital roof (57%). Group 3 ( n = 14, 43%) involved fractures of the ipsilateral zygoma (100%), lateral orbital wall (29%), as well as frontal and nasal bones (21% each). Group 4 ( n = 5, 15%) consisted of mid- and upper-face fractures; 100% fractured the ipsilateral orbital floor, medial and lateral walls, maxilla, and zygoma; 80% fractured the orbital roof and bilateral zygoma. Group 5 ( n = 4, 12%) was characterized by fractures of the ipsilateral orbital floor, medial and lateral orbital walls (75% each), and orbital roof (50%). A notably high 15 of 33 patients (45%) sustained penetrating trauma. Our study demonstrates five fracture pattern groups associated with TON. Zygomatic, frontal, nasal, and orbital fractures were the most common. Fractures with a combination of frontal, nasal, and orbital fractures are particularly concerning and warrant close attention to the eye.
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Kim, Yong Hee, Jae Ho Kim, and Jin Yong Jeon. "Scale Model Investigations of Diffuser Application Strategies for Acoustical Design of Performance Venues." Acta Acustica united with Acustica 97, no. 5 (September 1, 2011): 791–99. http://dx.doi.org/10.3813/aaa.918459.

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This work investigates the effects of diffusive surfaces on concert hall acoustics using scale models with regard to hall shape and diffuser location. Two simple 1:50 scale models (shoebox and fan-shaped) were produced to measure the RT and SPL, which were decreased by wall diffusers in both hall shapes. In the shoebox hall, SPL was increased especially in the frontal area but was decreased in the rear area due to redirection of the second reflections by the opposite lateral walls, whereas SPL was decreased in both the frontal and rear area in the fan-shaped hall. For in-depth investigation of diffuser location and profile, three shoebox model halls were reproduced: a 1:50 symphony hall, a 1:25 chamber hall and a 1:25 theater. Minimal reductions in RT and LL and decreased spatial deviation in acoustical parameters were established as criteria to determine the effective diffuser location. The halves of the lateral walls closest to the stage were found to be the most effective areas for diffuser installation. Additionally, large and sparse diffuser profiles usually provided better acoustical results.
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Yoon, Bit-Na, Pete S. Batra, Martin J. Citardi, and Hwan-Jung Roh. "Frontal Sinus Inverted Papilloma: Surgical Strategy Based on the Site of Attachment." American Journal of Rhinology & Allergy 23, no. 3 (May 2009): 337–41. http://dx.doi.org/10.2500/ajra.2009.23.3328.

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Background The surgical management of inverted papilloma (IP) involving the frontal sinus (FS) remains a challenge given the narrow confines of the frontal recess and the close proximity to critical structures. The objective of this study was to elucidate a surgical strategy for management of frontal sinus IP based on the site of attachment. Methods A retrospective chart review was performed on 18 patients with FS IP treated at the Pusan National University Hospital and the Cleveland Clinic Foundation between 1998 and 2008. Results The mean age was 53.8 years with a male/female ratio of 13:5. The sites of tumor attachment included the medial wall (MW; six cases), posterior wall (PW; five cases), diffuse (all walls involved; five cases), intersinus septal cell (three cases), lateral wall (two cases), and anterior wall (two cases). IP involvement was unifocal in 10 cases and multifocal in 8 cases. Unifocal IP attached to the MW or PW was managed strictly by endoscopic frontal sinusotomy (EFS) in five of six cases (83%). Multifocal IP required endoscopic modified Lothrop (EML) and/or open approaches (endoscopic frontal trephination [EFT], four, osteoplastic flap [OPF], one) in seven of eight cases (88%). One additional patient with bilateral anterior table involvement required OPF. Four (22%) patients developed recurrences. Two were managed by EML, one was managed by EFS, and one was managed by EFT and EFS. Two patients developed cerebrospinal fluid leaks that were managed endoscopically without untoward effects. All patients were free of disease at the time of last evaluation with a mean follow-up of 36.6 months. Conclusion Frontal sinus IP with MW or PW involvement can generally be managed by standard EFS. Tumors with multifocal involvement often require EML, along with adjunct EFT in selected cases. OPF can be avoided as the primary surgical approach in most patients with sinonasal papilloma of FS.
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Bondarchuk, Oleksandr. "Fractures of the walls of the frontal sinus: criteria for choosing the tactics of surgical treatment and indications for obliteration." OTORHINOLARYNGOLOGY, no. 1(2) 2019 (March 9, 2019): 66–70. http://dx.doi.org/10.37219/2528-8253-2019-1-66.

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Treatment of fractures of the walls of the frontal sinus complicates the presence of intracranial pathology. The main goals of surgical treatment of such states are: protection of intracranial structures, sealing of the cavity of the skull; prevention of early and late purulent-inflammatory complications; correction of aesthetically significant deformation and restoration of the shape of the frontal area. To determine the indications for frontal sinus obliteration (LP), it was necessary to detect changes to the operation that prevented it from being stored as an airborne cavity, or would make such an attempt "risk" for relapse. The main step in prevention of complications is the surgical removal of the mucous membrane and the closure of the mucus, therefore, the criterion for choosing surgical tactics for lesions of the foam-basal localization, and surrounding tissues is to determine the condition of the fronto-nasal constriction and its walls Failure to comply with these provisions will inevitably lead to complications in the postoperative period.
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Persing, John A., John A. Jane, Paul A. Levine, and Robert W. Cantrell. "The versatile frontal sinus approach to the floor of the anterior cranial fossa." Journal of Neurosurgery 72, no. 3 (March 1990): 513–16. http://dx.doi.org/10.3171/jns.1990.72.3.0513.

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✓ A technique to expose the anterior cranial base is described with entry through the anterior and posterior walls of the frontal sinus. Burr holes are avoided in the visible portion of the forehead. Expansion of the operative field may be accomplished, if necessary, by supplemental superior frontal or supraorbital rim osteotomy. The technique is rapid, safe, and provides excellent operative exposure and superior cosmetic results.
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Gil-Carcedo, L. M., E. S. Gil-Carcedo, L. A. Vallejo, J. M. de Campos, and D. Herrero. "Frontal osteomas: standardising therapeutic indications." Journal of Laryngology & Otology 125, no. 10 (July 18, 2011): 1020–27. http://dx.doi.org/10.1017/s0022215111001563.

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AbstractBackground:We believe the currently accepted indications for frontal osteoma surgery are inappropriate. We propose a new osteoma classification system, below, in order to standardise surgical decisions.Method:Osteomas were classified based on: relationship of tumour mass to sinus size; tumour proximity to the infundibulum, destruction of sinus walls, and complications. Forty-five osteoma cases were thus classified (1971–2007), 29 of which underwent surgery (64.44 per cent).Results:Three stages were thus derived: I, tumour/air fraction less than one-third, tumour distant from the infundibulum, no sinusitis, and no complications (18 patients (40 per cent)); II, tumour/air fraction one-third to one-half, no infundibular obstruction, no bone destruction, no sinusitis, and no complications (six (13.33 per cent)); and III, tumour/air fraction more than one-half, partial or total infundibular obstruction, sinusitis, bone destruction, and/or complications (21 (46.67 per cent)).Conclusion:Study findings suggest the following surgical indications: stage I, no surgery required, implement monitoring protocol; stage II, implement monitoring protocol, surgery may be required depending on tumour severity and general patient condition; and stage III, surgery always required. This system provides a method of standardising osteoma surgical decisions.
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DONALD, PAUL J., and MALCOLM ETTIN. "THE SAFETY OF FRONTAL SINUS FAT OBLITERATION WHEN SINUS WALLS ARE MISSING." Laryngoscope 96, no. 2 (February 1986): 190???193. http://dx.doi.org/10.1288/00005537-198602000-00011.

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Dissertations / Theses on the topic "Frontal walls"

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Klaper, Eva-Maria Klaper Eva Maria. "Deformation history and metamorphic mineral growth along the Pennine frontal thrust (Wallis, Ticino), Switzerland /." Zürich : Geologischen Institut der Eidg. Technischen Hochschule und der Universität Zürich, 1985. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7782.

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Defienne, Hugo. "Quantum walks of photons in disordered media." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066630/document.

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Nous nous ici intéressons à la propagation d'états non-classiques de la lumière à travers des milieux désordonnés, comme les couches de peinture ou les fibres multimodes. Ces milieux sont généralement considérés comme des obstacles à la propagation de la lumière: par exemple, la diffusion de la lumière dans les tissus biologiques diminue considérablement les capacités des systèmes d'imagerie optique. C'est donc un phénomène duquel on souhaite généralement s'affranchir. Au contraire, dans notre étude nous exploitons ce désordre et utilisons ces milieux comme des "mélangeurs" de lumière. La lumière qui y pénètre est fortement diffusée et ses propriétés spectrales, spatiales et de polarisation sont complètement redistribuées. Cette redistribution est associée à un phénomène de propagation d'onde et d'interférence complexe qui est donc déterministe. Nous pouvons alors utiliser des méthodes de manipulation de front d'onde pour étudier ou contrôler ce mélange. Associés à des états non-classiques, ces systèmes permettent de réaliser des marches aléatoires quantiques dans des environnements bien plus complexes que ceux qui existent actuellement. Les méthodes de contrôle de front d'onde nous ont permis d'étudier et de manipuler ces marches aléatoires. Nous avons notamment montré qu'il est possible de guider les photons en manipulant les interférences classiques et quantiques. Ce travail nous a permis d'étudier de nouveaux aspects de la physique des milieux complexes, mais aussi d'explorer un nouveau type de plateformes pour marches aléatoires quantiques qui pourraient jouer un rôle important dans le développement des nouvelles applications pour traitement de l'information
Light is not only an ideal medium to transmit information, but also a very interesting physical system to process it. In this respect, quantum optics has recently emerged as a highly promising domain for the development of new computing applications that can surpass the performances of currently available systems. In this respect, quantum walk of photons has recently emerged as a very powerful model for quantum information science, and integrated photonic devices have proven a versatile architecture for their implementation. While these waveguide structures allow only near-neighbor coupling between up to a few tens of modes, complex linear systems, such as white paint layer or multimode fiber, enable to couple efficiently a huge numbers of optical modes. Unstable and lossy, these systems have always been considered unpractical for quantum optics experiments. Wavefront shaping methods, developed in the last decade to control light propagating in complex media, allow moving beyond these limitations and make them exploitable with non-classical light. In our work, we demonstrate the implementation of quantum walks in a layer of paint and a multimode fiber using single-photons and photon-pairs. For this purpose, we extend wavefront shaping methods, originally developed to control classical light propagation in complex media, to non-classical light. This capability to manipulate photons allows building new controllable highly multimode optical platforms. Such systems pave the way for the next generation of quantum information processing devices
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Pickard, Susan. "Living on the front line : a social-anthropological study of ageing in South Wales." Thesis, University of Bristol, 1994. http://hdl.handle.net/1983/601e765e-298f-4e0a-a285-767b4bbe53cb.

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Andersson, Staffan, and Mikael Jansson. "Framstam till timmerlastbil." Thesis, Karlstad University, Faculty of Technology and Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2660.

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Examensarbetet har gjorts åt Höglunds flak i Säffle och behandlar en ny framstam till timmerlastbilar.

En framstam är ett lastskydd som förhindrar stockarna på en timmerlastbil från att tränga in i hytten vid en kollision. Framstammen används även vid lastning som ett mothåll att slå stockarna emot.

Kraven på framstammen från företaget är

• Lättare konstruktion

• Samma utböjning vid slagprov, ytbelastning och böjbelastningsprovning som nuvarande modell

• Billigare eller samma pris som föregående modell

• Klara proven enligt SS 2563, SS 2564

• Vara estetiskt tilltalande för kund

• Anpassningsbar höjd

• Om möjligt få så mycket tillverkning som möjligt till den egna verkstaden

Arbetet delades in i två delar där en del är att konstruera plåten och hur denna skall styvas till. Den andra är att konstruera staken som håller upp plåten och tar den största delen av slagkraften.

På framstamsplåten togs det fram 2 koncept.

Bockningskonceptet.

Konceptet består av en aluminiumplåt 6082-T6 som bockats till en L-profil runt kanterna för att styva upp plåten

Fyrkantsprofil.

Detta koncept består av en fyrkantsprofil i aluminium som nitas fast mot plåten.

På staken togs det fram tre koncept. Alla tre är beräknade med att vara i samma material ett höghållfast stål vid namn Domex 650 med en sträckgräns på ca 650Mpa.[5]

JL-profilen

Är en profil som är lätt att tillverka genom bockning och är lätt att fästa in i både plåten och i rambalken.

I-profilen

I-balken är gjord med en större fläns mot plåten för att underlätta vid infästning och en mindre fläns på andra sidan för att minska vikten. På grund av att detta inte är en original balk så kommer denna modell att strängpressas.

W-profilen

W- profil som även denna skulle stängpressas och är även lätt att fästa mot plåten. Den har tagits fram med tanken på en T-balk som sedan stadgats upp med två stycken förstyvningar.

Fyrkantröret har en lägre vikt på 19 kg i jämförelse med rör- profilen, detta motsvarar en viktbesparing på 55%.

I-profilen klarar att ta upp 0,6kJ mer än Z-profilen samtidigt som den är 23 kg och 23%

lättare.


The work is done for the company Höglunds flak in Säffle and aims to develop a new front wall to a timber truck.

A front wall is what protects the cabin from the logs in case of a collision. The front wall is also used while loading the truck as a loading fixture to beat the logs against.

The requirements for the front wall from the company are:

• Easier construction

• The same deformation at impact testing, surface testing and bending load as the original.

• Cheaper or the same price as the previous model

• Withstand the standardization SS 2563, SS 2564

• Be attractive to the customer

• Customizable height

• If possible, get as much production as possible to the own workshop

The work was divided into two parts where one is to make the plate and how to make it rigid. The second is the beams which are going to keep up the plate and takes the greater part of the impact force.

Two concepts on the front wall plate, both is of the same material 6082-T6.

Bending concept.

The concept consists of an aluminium plate which is bended to an L-profile around the edges to rigid up the plate.

Square concept.

This concept consists of a square tube in aluminium which is riveted firmly against the plate.

Three concepts on the beams. All three are estimated to be in the same material Domex 650

JL-profile

Is a profile that is easy to manufacture by bending and is easy to mount on both the plate and in the frame beams.

I-profile

The I-beam is made with a larger flange to the plate in order to facilitate the attachment and a small flange on the other side to reduce weight. However, because this is not an original beam it will be manufactured through extrusion.

W-profile

W-profile is going to be extruded and is also easy to attach to the plate. It has been developed with the idea of a T-beam which then is stated up with two webs.

Of the two plate concepts it was the Square concept which was best suited one. The bending concept was not chosen because the material of the plate was for brittle and couldn’t be bent as much as wanted.

The analysis of the plate was made according to the standard SS2563, SS 2564 with a pressure of a certain distance from the base.

The FEM analysis at the plate shows that there is no residual deformation, which is the same as the original plate. The square pipe has a lower weight with 19 kg which is 55% lighter compared with the circular pipe profile.

The profile is able to take up 0,6 kJ more than the Z-profile and 23kg and 23% lighter

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Putra, Andreas Wahyu Gunawan, University of Western Sydney, and Sydney Graduate School of Management. "Evaluating training programs : evaluating training programs for front line associates in the hotel sector in Sydney : demonstrating Kirkpatrick's model." THESIS_SGSM_XXX_Putra_A.xml, 2003. http://handle.uws.edu.au:8081/1959.7/723.

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Research for this project was undertaken by means of a broad and comprehensive literature search, a field study and the development of four working papers. It has been quoted,The hospitality industry appears to be facing increasing competitive pressures to improve the quality of its delivery of products and services. For many hotels, success depends largely on the availability of qualified line associates who are able to translate and consistently maintain their company's operational standards of service. Hotel companies, thus, must take training programs for front line associates seriously to accommodate the growing pressure to provide qualified associates. Consequently, many hotels now highlight training activities for front line associates as a means of providing an outstanding service for their customers. However, there is often scepticism about whether training actually pays off for organisations. Despite the importance of the topic, there appears to be little research on evaluating training for front line associates in the hospitality industry, particularly in the hotel sector. Therefore, this project is arguably pioneering in its analysis of applying the model chosen. It has demonstrated through empirical evidence the usefulness of the model to the four hotels in Sydney. This project has investigated evaluating training programs by analysing the reaction of the trainees, learning gained by the trainees, transfer of learning to the workplace by the trainees and training outcomes. The research is expected to be useful to other training practitioners and/or scholars who are interested in taking further research in the hospitality industry, particularly in the hotel sector.
Doctor of Business Administration
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Abdelall, Fahd Fathi. "Experimental and numerical studies of the Rayleigh-Taylor instability for bounded liquid films with injection through the boundary." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04072004-102937/unrestricted/abdelall%5Ffahd%5Ff%5F200405%5Fphd.pdf.

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Dumazer, Guillaume. "Dynamique microscopique et propriétés macroscopiques de systèmes réactifs structurés : fronts d'onde chimiques exothermiques et prise du plâtre." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00628301.

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Cette thèse traite, dans une première partie, de la propagation unidimensionnelle de fronts de réactions exothermiques, à différentes échelles de description. Dans une approche macroscopique, la quantité de chaleur dégagée par la réaction vient coupler l'équation de convection-réaction-diffusion et les équations de l'hydrodynamique. Ce travail montre l'existence d'un domaine interdit de vitesses de propagation pour un front d'onde chimique stationnaire. Il met en évidence une transition entre une propagation principalement déterminée par les processus de réaction-diffusion, pour de faibles chaleurs de réaction, et une propagation principalement déterminée par les équations de l'hydrodynamique et l'équation d'état du fluide, pour une quantité de chaleur plus importante. Cette bifurcation est illustrée dans les cas d'un gaz parfait et d'un fl uide de van der Waals. La simulation microscopique de la dynamique des particules par la méthode 'Direct Simulation Monte Carlo' (DSMC) permet de retrouver ces résultats pour un gaz dilué. Dans une seconde partie, cette thèse développe un modèle de précipitation d'aiguilles de gypse à partir de grains d'hémihydrate de sulfate de calcium ainsi qu'un algorithme de simulation de la prise du plâtre à une échelle submicrométrique. Les résultats de simulation sont comparés à ceux issus d'une approche déterministe et d'une approche stochastique par une équation maîtresse. En dégageant un ensemble de paramètres ajustables et interprétables physiquement, le modèle permet de proposer une explication de l'effet d'un traitement industriel con dentiel améliorant la cinétique de formation et la morphologie du matériau final.
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Klecandrová, Jana. "Rekonstrukce silničního mostu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226960.

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This thesis deals with the reconstruction of the existing road arch bridge using free transverse prestressing cables. Cables are laid in holes drilled in the shape of strut. The holes routed diagonally across the front wall of the bottom edge of the arch. The work also includes the stability of long front wall. This is solved by means of spacer frames led across the road. The reconstruction can be done partially limited service.
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Bel, Justin. "Modélisation physique de l’impact du creusement d’un tunnel par tunnelier à front pressurisé sur des fondations profondes." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSET002/document.

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Le travail de thèse présenté dans ce mémoire vise à analyser et à comprendre les mécanismes mis en jeu au niveau de l’impact du creusement d’un tunnel par bouclier à front pressurisé sur des fondations profondes avoisinantes. Cette thèse a été réalisée dans le cadre du projet européen NeTTUN, au sein du Laboratoire de Tribologie et de Dynamique des Systèmes (LTDS) de l’ENTPE. L’approche phénoménologique conduite lors de ces travaux repose sur deux importantes campagnes expérimentales réalisées à l’aide d’un dispositif unique au plan international de modèle réduit 1g de tunnelier à pression de terre (échelle de l’ordre de 1/10eme). La forte originalité de ce dispositif est de pouvoir simuler de façon réaliste les principales étapes du processus tridimensionnel d’excavation mécanisé d’un tunnel. Dans le cadre de cette thèse, le dispositif existant de modèle réduit de tunnelier a dans un premier temps été reconfiguré afin de pouvoir répondre aux besoins du programme expérimental envisagé. Des modèles physiques de fondations profondes (pieux et groupes de pieux) et de barrières de protection ont été conçus dans le cadre des lois de similitude, fabriqués et instrumentés. Deux campagnes expérimentales d’envergure ont été réalisées en massif de sable sec : l’une concerne les effets du passage d’un tunnelier à front pressurisé sur des fondations profondes avoisinantes (pieux, groupe de pieux), l’autre traite de l’efficacité de barrières de protection (parois moulées) utilisées pour limiter ces effets. Différents paramètres qui influencent l’interaction tunnelier - sol - fondations ont été considérés comme la distance relative tunnel / fondation, la pression frontale de soutènement appliquée par le TBM sur le terrain ou encore la hauteur des barrières de protection. L’analyse phénoménologique menée à l’échelle du modèle concerne en particulier l’évolution des champs de contraintes et de déplacements dans le terrain autour du tunnelier, les déplacements relatifs sol - pieu et sol- barrière, la redistribution des efforts au sein des fondations. L’importante base de données et d’analyse ainsi constituée a été mise à profit pour la validation d’outils de modélisation numérique développés par l’Université de Rome au sein du projet NeTTUN
The major goal presented in this thesis was to analyze and investigate the mechanisms, which are involved in the impact of the tunnels excavated thanks to an Earth Pressure Balanced Shield on nearby deep foundations. This thesis was realized in European project NeTTUN and the work had been done in the Laboratory of Tribology and Systems Dynamics (LTDS) of ENTPE. During these works, phenomenological approach was based on two important experimental campaigns carried out using a unique device at the international level of a 1g scale model of earth-pressure tunnel boring machine (scale of the order of 1 / 10). The state of the art of this device was to be able to simulate in possibly realistic way the main stages of the three-dimensional process of mechanized excavation of a tunnel. In the framework of this thesis, the existing model tunneling machine device was initially reconfigured in order to reach the expectations of the experimental program envisaged. Physical models of deep foundations (piles and groups of piles) and protective barriers were designed under the similitude laws, manufactured and instrumented. The two large-scale experimental campaigns have been carried out in a dry sand massif. The first one concerned the effects of the passage of a pressurized tunnel boring machine on nearby deep foundations (piles, group of piles), whereas another one dealed with the effectiveness of mitigation procedure (diaphragm walls) used to limit these effects. Different parameters that influenced on the tunneling: soil - foundation interaction considered as the relative tunnel / foundation distance, the frontal face pressure applied by the TBM in the field or the height of the protective barriers. The phenomenological analysis carried out at the scale of the model concerned in particular the evolution of the fields of stresses and displacements in the ground around the tunnel boring machine, relatives pile / soil and wall / soil displacements and the redistribution of stresses along the pile foundations. The large database and analysis constituted was used for the validation of numerical modeling tools developed by the University of Rome within the NeTTUN project
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Šubrt, Stanislav. "Návrh přístroje pro analýzu vzniku a šíření trhlin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231511.

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The main goal of this thesis is to get an insight into a field of non-destructive testing using potential drop techniques that have nowadays become the standard not only in the fatigue and loading tests but also in the industry. These methods can serve to non-destructively and continuously measure material specimens, thickness, corrosion losses, deformations, spectroscopy and detection and analysis of crack geometry. They can help to identify materials and measure material changes over time. The second part of this thesis deals with designing the aperture for detection of cracks in steam and product piping using potential drop technique modified by Ing. Ladislav Korec, CSc. Last part deals with extensive testing, experimenting and evaluation of the aperture.
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Books on the topic "Frontal walls"

1

With our backs to the wall: Victory and defeat in 1918. Cambridge, Mass: Belknap Press of Harvard University Press, 2011.

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The Siegfried Line: German defense of the west wall, September-December 1944. Mechanicsburg, PA: Stackpole Books, 2009.

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Environment, Ireland Department of the. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Ireland. Department of the Environment. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Ireland. Department of the Environment. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Ireland. Department of the Environment. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Ireland. Department of the Environment. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Ireland. Department of the Environment. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Ireland. Department of the Environment. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Ireland. Department of the Environment. Conservation guidelines. Dublin: Department of the Environment, 1996.

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Book chapters on the topic "Frontal walls"

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Beekley, Alec C. "Chest Wall and Diaphragm Injury." In Front Line Surgery, 229–37. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-6079-5_17.

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Beekley, Alec C., Matthew D. Tadlock, and William B. Long. "Chest Wall and Diaphragm Injury." In Front Line Surgery, 313–27. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56780-8_18.

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Mohanty, Sujata. "Frontal Sinus Wall Fractures." In Maxillofacial Trauma, 355–65. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6338-0_20.

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George, Thomas. "Female Agricultural Workers in Wales in the First World War." In The Home Front in Britain, 92–107. London: Palgrave Macmillan UK, 2014. http://dx.doi.org/10.1057/9781137348999_7.

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Pigrum, Derek. "On the Floor in Front of the Work." In The Wall Beside the Work, 81–94. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71629-5_8.

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Garbey, Marc, and Damien Tromeur-Dervout. "Computing stiff propagating combustion fronts between walls on MIMD architecture." In High-Performance Computing and Networking, 989–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-61142-8_676.

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Sengupta, Tapan K., and Swagata Bhaumik. "Dynamics of the Spatio-Temporal Wave-Front in 2D Framework." In DNS of Wall-Bounded Turbulent Flows, 275–305. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0038-7_5.

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Inoue, Manabu, Yuri Masaoka, Mitsuru Kawamura, Yoshiwo Okamoto, and Ikuo Homma. "Role of the medial frontal wall for readiness of motor execution." In Transmitters and Modulators in Health and Disease, 137–52. Tokyo: Springer Japan, 2009. http://dx.doi.org/10.1007/978-4-431-99039-0_11.

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Schanderl, Wolfgang, and Michael Manhart. "Reliability of Wall Shear Stress Estimations in Front of a Wall-Mounted Cylinder." In Direct and Large-Eddy Simulation X, 71–77. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63212-4_8.

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Rindel, Jens Holger. "The sound field in front of a wall." In Sound Insulation in Buildings, 49–68. Boca Raton : CRC Press, [2018]: CRC Press, 2017. http://dx.doi.org/10.1201/9781351228206-4.

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Conference papers on the topic "Frontal walls"

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Nechyporenko, Alina S., Viktor M. Reshetnik, Victoriia V. Alekseeva, Nadiia O. Yurevych, Rozana S. Nazaryan, and Vitaliy V. Gargin. "Implementation and analysis of uncertainty of measurement results for lower walls of maxillary and frontal sinuses." In 2020 IEEE 40th International Conference on Electronics and Nanotechnology (ELNANO). IEEE, 2020. http://dx.doi.org/10.1109/elnano50318.2020.9088916.

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Kirkman, Richard, Meredith Metzger, Mark Deaver, and Eric Pardyjak. "Sensitivity Analysis of a Three-Dimensional Wind Tunnel Design." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98322.

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The present paper describes the design of the TreadPort Adaptive Wind Tunnel (TPAWT), which is a wind tunnel retrofit to the University of Utah Treadport Virtual Environment (VE). The TPAWT integrates haptic wind sensation with the preexisting VE, which includes a large tilting treadmill and a cave-like frontal visual display. Desired flow patterns at the center of the TPAWT (where the VE user stands) are generated by appropriately steering the inlet airstream from two sets of vents embedded in the side walls of the facility. Hypothetically, the addition of haptic wind sensation in the virtual environment will improve the sense of immersion in the virtual reality. The present study focuses on quantifying the sensitivity of the flow field inside the TPAWT to perturbations in boundary conditions at the vents. Results from three-dimensional and two-dimensional numerical simulations are compared to laboratory experiments in a 1:4 scale model of the TPAWT. The stability of the flow near the VE user is shown to be highly sensitive to the angle of the mean flow at the vent boundary.
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Hashemi, Siavash, Sharlin Anwar, Shahab Mansoorbaghaei, and Ali M. Sadegh. "The Influence of Sulci Trabeculae in Mitigating Impact Induced TBI." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70905.

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Traumatic brain injury (TBI) is an intracranial injury caused by impacts or angular accelerations of the head such as a violent blow, a bump, a projectile, or even a blast. TBI is a major problem that accounts for over 1.4 million emergency room visits in US. Thus, it is important to understand and predict the occurrence of TBI. Previous studies have shown that the interaction between the subarachnoid space (SAS) trabeculae and the cerebrospinal fluid (CSF) plays an important role in damping the effect of impacts and reducing the brain injuries. However, the influence of sulci parameters and sulci trabeculae in impact induced TBI is still unexplored. A few studies have shown that inclusion of sulci in brain models alters the brain injuries conclusions, even though those models do not take into account the trabecular tissue present in the sulci. In this study, to obtain a perspective of the morphology and architecture of the sulci trabeculae at the frontal lobe of the brain, Human cadaver brain of an 87 year old male was used. For the first experiment, several sulci from the frontal lobe were sectioned and measured to find the average sulci depth, using the image processing software called ‘ImageJ’. This experiment was followed by the Scanning Electron Microscopy (SEM) study on the samples prepared from the frontal lobe. Indeed, numerous images were taken at various magnifications to find different trabecular morphology and architecture in the sulci. The results from the experimental studies were used in our numerical analyses. To do so, the validated global 3D FE model of the human head and neck, created at The City College of New York, were impacted by a rigid barrier on the forehead. The pressure time history, beneath the skull, was calculated during and after the impact. Moreover, a local 3D FE model has been created, having the meninges and the brain with sulci, including the trabeculae and the CSF. The depth of the sulci and the architecture of the trabeculae have been inspired by the imaging and SEM studies. Indeed, the top surface of the local model was subjected to the pressure loading condition obtained from the global model. The results of the finite element simulations reveal that the interaction between the trabeculae and the CSF inside the sulci, would affect and reduce the movement and displacement of gyri and sulci’s walls when the forehead of the head is impacted by an elastic barrier.
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Bochio, Gustavo, and Gustavo R. S. Assi. "Numerical Investigation of the Effect of Blockage on the Hydrodynamic Coefficients of a Prolate Spheroid." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-22158.

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Experiments with submarine models in cavitation tunnels are limited by the length scale of the body in relation to the size of the test section. Especially for high angles of attack, the body will experience strong flow interference due to the proximity of the walls. Consequently, the hydrodynamic coefficients will normally require empirical corrections in order to be extrapolated to represent open-water flows. The present work investigates the effect of local hydrodynamic blockage, i.e. the ratio between the body frontal area to the cross area of the test section, on the determination of the hydrodynamic coefficients of a prolate spheroid. Numerical simulations of the flow around the body in various angles of attack were performed solving the Re-averaged Navier-Stokes equations for Reynolds numbers in the range of 60 million. The numerical domain is built to represent the test section of a large cavitation tunnel in full scale. Results for coefficients of lift, drag and pitching moment are compared for several cases with blockage ratio of 0%, 1% and 5% and angle of attack of 0 and 10 degrees. The maximum deviation of around 30% from the reference case was obtained at the angle of attack of 10 degrees for the highest blockage ratio. The topology of the flow showed no significant dependency on blockage for the tested range.
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Cuartero, Jesu´s, Antonio Miravete, Luis Castejo´n, and Marco Carrera. "Metallic Front Beam Design." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35659.

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In this paper, new advances in simulation of car frontal crash structure are presented. Experimental results have been used to calibrate constitutive material models and simulation procedures to obtain more accurate representation of material behavior under crash loading. These advanced computational techniques are then applied to the crash simulations of components. The front longitudinal beam studied in this paper is analyzed for frontal crash. Qualitative results on specific energy absorption, as well as the absolute energy absorbed by the structure, are especially relevant. Three designs are then proposed as potential solutions for the front side rail design. Through simulation of their impact into a wall the designs are compared on the basis of crush force and specific energy absorption and a preferred design is chosen.
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Snively, Eric, John R. Cotton, Lawrence Witmer, Ryan Ridgely, and Jessica Theodor. "Finite Element Comparison of Cranial Sinus Function in the Dinosaur Majungasaurus and Head-Clubbing Giraffes." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53127.

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Majungasaurus crenatissimus is a spectacularly preserved carnivorous dinosaur from latest Cretaceous Madagascar. Computed tomographic (CT) scans reveal unusual internal anatomy of the dinosaur’s cranium [1,2; Figure 1]: the nasals form a large hollow chamber traversed with bony struts, and a unicorn-like projection of the frontals is also hollow. The wall thickness and struts within these sinuses recall sinuses of giraffes, which strike each other with a median projection (ossicone) above a frontal sinus and lateral ossicones of the parietals [3]. Giraffe-like cranial sinuses, and large attachments for neck muscles [4], raise the hypothesis that Majungasaurus could engage in giraffe-like head strikes to each other’s necks and flanks.
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Dixit, Y., P. Begeman, G. S. Dhaliwal, G. Newaz, D. Board, Y. Chen, and O. Faruque. "Full Frontal Crashworthiness of Carbon Fiber Composite Front Bumper Crush Can (FBCC) Structures." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70354.

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This research study highlights the testing method and relevant results for assessing impact performance of a carbon fiber composite front bumper crush can (FBCC) assembly subjected to full frontal crash loading. It becomes extremely important to study the behavior of lightweight composite components under a crash scenario in order to apply them to automotive structures to reduce the overall weight of the vehicle. Computer-aided engineering (CAE) models are extremely important tools to virtually validate the physical testing by assessing the performances of these structures. Due to lack of available studies on carbon fiber composite FBCCs assemblies under the frontal crash scenario, a new component-level test approach would provide assistance to CAE models and better correlation between results can be made. In this study, all the tests were performed by utilizing a sled-on-sled testing method. An extreme care was taken to ensure that there is no bottoming-out force for this type of test while adjusting the impact speed of sled. Full frontal tests on FBCC structures were conducted by utilizing five high-speed cameras (HSCs), several accelerometers and a load wall. Excellent correlation was achieved between video tracking and accelerometers results for time histories of displacement and velocity. The standard deviation and coefficient of variance for the energy absorbed were very low suggesting the repeatability of the full frontal tests. The impact histories of FBCC specimens were consistent and in excellent agreement with respect to each other. Post-impact photographs showed the consistent crushing of composite crush cans and breakage of the bumper beam from middle due to the production of tensile stresses stretched caused by straightening of the bumper curvature after hitting the load wall.
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Teh, Hee Min, Vengatesan Venugopal, and Tom Bruce. "Performance Analysis of a Semicircular Free Surface Breakwater." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49700.

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In the present study, the hydrodynamic performance of a semicircular free surface breakwater (SCB) has been investigated through a systematic experimental programme. Three semicircular breakwater models were tested: one with impermeable front and rear walls; a second with perforated front wall and impermeable rear wall; and a third with perforated front and rear walls. The models were tested for three submergence depths with reference to the still water level in a wave flume under irregular seas with different significant wave heights and peak periods. The performance of the breakwaters was evaluated in the form of coefficients of transmission (CT), reflection (CR) and energy dissipation (CL). The measured wave modification in front of the structure and in the breakwater’s chamber were quantified and presented in the form of a ratio relative to the incident wave height, respectively. Also, the measured horizontal wave forces acting on the SCB were analysed and reported in a dimensionless form. Empirical equations were then developed using nonlinear multiple regression models to estimate the hydrodynamic characteristics of the SCB models.
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Dixit, Y., P. Begeman, G. Newaz, D. Board, Y. Chen, and O. Faruque. "Full Frontal Impact Comparison of Steel and Carbon Fiber Composite Front Bumper Crush Can (FBCC) Structures." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87110.

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This study compares the deformation characteristics of steel and carbon fiber composite (CFC) front bumper crush can (FBCC) assemblies when subjected to a full-overlap frontal impact into a rigid wall. Both the steel and composite bumper tests were conducted using a sled-on-sled testing method. Several high-speed cameras (HSCs) and accelerometers were used to gather kinematics data. The applied forces were measured using a load cell wall. For each test, the collective set of data was filtered, sorted, and analyzed to compare the performance of the steel and CFC bumpers. Similarities in Acceleration-Time plots suggested resemblance in the deformation patterns for both types of bumper systems. The difference observed in the velocity and displacement time-histories was because of the brittle nature of the composite material. The velocity-time history of the CFC FBCC had two distinct patterns, events suggesting adhesive bond failure between the bumper beam and the crush cans, which was validated through video tracking. Post-impact photographs showed a clear difference between the material behavior of composite and steel bumpers when subjected to high-velocity impact. The steel bumper beam was bent uniformly with intact, equally crushed crush cans. The composite beam was cracked in the middle and was detached from the crush cans.
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Franco, Admilson Texeira, and Marcelo M. Ganzarolli. "Numerical Simulation of a Thermally-Driven Open Cavity With a Shrouding Wall." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13233.

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Natural convection in a square open cavity with and without the presence of a shrouding wall is analyzed. One vertical wall is heated and the horizontal walls are adiabatic. The other vertical wall is open to the ambient or a fluid reservoir. A shrouding wall is placed in front of this open wall forming a vertical open channel. Laminar and two-dimensional flow is assumed for the Rayleigh number ranging from 103 to 107 and the problem is solved numerically by using the Finite Volume-SOLA method. The average Nusselt number is reported for different values of the Rayleigh number and the distance of the shrouding wall to the open cavity.
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Reports on the topic "Frontal walls"

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Thambimuthu, K. V., H. Whaley, A. Bennett, and K. A. Jonasson. Development of a 16 MWth coal-water fuel/heavy oil burner for front wall firing. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/304399.

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Christopher D. White. 3D Sedimentological and geophysical studies of clastic reservoir analogs: Facies architecture, reservoir properties, and flow behavior within delta front facies elements of the Cretaceous Wall Creek Member, Frontier Formation, Wyoming. Office of Scientific and Technical Information (OSTI), December 2009. http://dx.doi.org/10.2172/969297.

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Janok P. Bhattacharya and George A. McMechan. 3-D sedimentological and geophysical studies of clastic reservoir analogs: Facies architecture, reservoir properties, and flow behavior within delta front facies elements of the Cretaceous Wall Creek Member, Frontier Formation, Wyoming. Office of Scientific and Technical Information (OSTI), February 2007. http://dx.doi.org/10.2172/899522.

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Janok P. Bhattacharya and George A. McMechan. 3-D sedimentological and geophysical studies of clastic reservoir analogs: Facies architecture, reservoir properties, and flow behavior within delta front facies elements of the Cretaceous Wall Creek Member, Frontier Formation, Wyoming. Office of Scientific and Technical Information (OSTI), February 2007. http://dx.doi.org/10.2172/899829.

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