scholarly journals DESIGN, ENGINEERING AND CONSTRUCTION OF A WAVE WALL FOR NORTHWESTERN UNIVERSITY

Author(s):  
Alejandra Lira-Pantoja ◽  
Margaret Boshek

Northwestern University sits on prime Lake Michigan real estate in Evanston, Illinois, north of Chicago . Needing to make the most of their landlocked urban campus, the university planned to build a new athletics center on coastal land extending onto a sandy beach. Because the design process occurred after a number of years of low water, architects designed the state-of-the-art building extremely close to the lake’s ordinary high water mark without understanding the historic dynamics of the lake. With the architectural design already completed, SmithGroupJJR’s coastal engineers were asked to perform a rigorous review of the site and potential wave conditions. They determined that the building would be subject to large wave forces and foundation erosion if left unprotected, and designed a reflecting wave wall integrated into and wrapped around the lakeside of the building.

Shore & Beach ◽  
2021 ◽  
pp. 46-55
Author(s):  
Ethan Theuerkauf ◽  
C. Robin Mattheus ◽  
Katherine Braun ◽  
Jenny Bueno

Coastal storms are an important driver of geomorphic change along Great Lakes shorelines. While there is abundant anecdotal evidence for storm impacts in the region, only a handful of studies over the last few decades have quantified them and addressed system morphodynamics. Annual to seasonal lake-level fluctuations and declining winter-ice covers also influence coastal response to storms, yet relationships between hydrodynamics and geomorphology are poorly constrained. Given this, the Great Lakes region lags behind marine coasts in terms of predictive modeling of future coastal change, which is a necessary tool for proactive coastal management. To help close this gap, we conducted a year-long study at a sandy beach-dune system along the western shore of Lake Michigan, evaluating storm impacts under conditions of extremely high water level and absent shorefast ice. Drone-derived beach and dune topography data were used to link geomorphic changes to specific environmental conditions. High water levels throughout the year of study facilitated erosion during relatively minor wave events, enhancing the vulnerability of the system to a large storm in January 2020. This event occurred with no shorefast ice present and anomalously high winter water levels, resulting in widespread erosion and overwash. This resulted in 20% of the total accretion and 66% of the erosion documented at the site over the entire year. Our study highlights the importance of both antecedent and present conditions in determining Great Lakes shoreline vulnerability to storm impacts.


Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1179
Author(s):  
Jonatan Sánchez ◽  
Antonio da Silva ◽  
Pablo Parra ◽  
Óscar R. Polo ◽  
Agustín Martínez Hellín ◽  
...  

Multicore hardware platforms are being incorporated into spacecraft on-board systems to achieve faster and more efficient data processing. However, such systems lead to increased complexity in software development and represent a considerable challenge, especially concerning the runtime verification of fault-tolerance requirements. To address the ever-challenging verification of this kind of requirement, we introduce a LEON4 multicore virtual platform called LeonViP-MC. LeonViP-MC is an evolution of a previous development called Leon2ViP, carried out by the Space Research Group of the University of Alcalá (SRG-UAH), which has been successfully used in the development and testing of the flight software of the instrument control unit (ICU) of the energetic particle detector (EPD) on board the Solar Orbiter. This paper describes the LeonViP-MC architectural design decisions oriented towards fault-injection campaigns to verify software fault-tolerance mechanisms. To validate the simulator, we developed an ARINC653 communications channel that incorporates fault-tolerance mechanisms and is currently being used to develop a hypervisor level for the GR740 platform.


Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 315
Author(s):  
Francesco Aristodemo ◽  
Giuseppe Tripepi ◽  
Luana Gurnari ◽  
Pasquale Filianoti

We present an analysis related to the evaluation of Morison and transverse force coefficients in the case of a submerged square barrier subject to the action of solitary waves. To this purpose, two-dimensional experimental research was undertaken in the wave flume of the University of Calabria, in which a rigid square barrier was provided by a discrete battery of pressure sensors to determine the horizontal and vertical hydrodynamic forces. A total set of 18 laboratory tests was carried out by varying the motion law of a piston-type paddle. Owing to the low Keulegan–Carpenter numbers of the tests, the force regime of the physical tests was defined by the dominance of the inertia loads in the horizontal direction and of the lift loads in the vertical one. Through the use of the time series of wave forces and the undisturbed kinematics, drag, horizontal inertia, lift, and vertical inertia coefficients in the Morison and transverse semi-empirical schemes were calculated using time-domain approaches, adopting the WLS1 method for the minimization of the difference between the maximum forces and the linked phase shifts by comparing laboratory and calculated wave loads. Practical equations to calculate these coefficients as a function of the wave non-linearity were introduced. The obtained results highlighted the prevalence of the horizontal forces in comparison with the vertical ones which, however, prove to be fundamental for stability purposes of the barrier. An overall good agreement between the experimental forces and those calculated by the calibrated semi-empirical schemes was found, particularly for the positive horizontal and vertical loads. The analysis of the hydrodynamic coefficients showed a decreasing trend for the drag, horizontal inertia, and lift coefficients as a function of the wave non-linearity, while the vertical inertia coefficient underlined an initial increasing trend and a successive slight decreasing trend.


1999 ◽  
Vol 45 (150) ◽  
pp. 201-213 ◽  
Author(s):  
E.M. Shoemaker

AbstractThe effect of subglacial lakes upon ice-sheet topography and the velocity patterns of subglacial water-sheet floods is investigated. A subglacial lake in the combined Michigan–Green Bay basin, Great Lakes, North America, leads to: (1) an ice-sheet lobe in the lee of Lake Michigan; (2) a change in orientations of flood velocities across the site of a supraglacial trough aligned closely with Green Bay, in agreement with drumlin orientations; (3) low water velocities in the lee of Lake Michigan where drumlins are absent; and (4) drumlinization occurring in regions of predicted high water velocities. The extraordinary divergence of drumlin orientations near Lake Ontario is explained by the presence of subglacial lakes in the Ontario and Erie basins, along with ice-sheet displacements of up to 30 km in eastern Lake Ontario. The megagrooves on the islands in western Lake Erie are likely to be the product of the late stage of a water-sheet flood when outflow from eastern Lake Ontario was dammed by displaced ice and instead flowed westward along the Erie basin. The Finger Lakes of northern New York state, northeastern U.S.A., occur in a region of likely ice-sheet grounding where water sheets became channelized. Green Bay and Grand Traverse Bay are probably the products of erosion along paths of strongly convergent water-sheet flow.


2020 ◽  
pp. 157-166
Author(s):  
Anna Gelfond ◽  
Andrei Lapshin

The Nizhny Novgorod State University of Architecture and Civil Engineering (NNSUACE) campus is located in Zapochainie, a historical area in Nizhny Novgorod, so the issues of revitalization of the historico-architectural environment and those concerning the methods of architectural design are interwoven in the text. The symbiotic relationship between education, science and practice used as a principal tool for the training of architects at NNSUACE made it possible to envision the evolution of the university campus. The article presents the projects proposed by professional architects and students in response to the need to meet both practical and ideological challenges – to transform the university campus into a viable public space.


Author(s):  
Juliano Aparecido Pereira

ENGLISHThe article presents and discusses an experience in Brazil on an architectural design method of teaching created by the School of Architecture and Urban Design of the University of Sao Paulo (FAU USP). We refer to a Pedagogical Reform proposed in 1962 and its consequences on the formation of Brazilian architects. Known as the 1962 Reform and having as its leader, in association with other professors, architect and professor João Batista Vilanova Artigas (1913-1985), the proposed new model for a method of project education ended up by being adopted, in some aspects, but not all, by the majority of Brazilian schools of architecture and urban design. The reform led by Vilanova Artigas proposed an overcoming of project teaching methods based either on the traditional model of architectural composition, by way of the School of Fine Arts, or on those for the formation of architect-engineers, by way of the Polytechnics. This new teaching method would be based on parameters for the comprehension of architectural practice, pointing to a generalist formation of the architect, thus instrumentalizing him to act within the various scales of architectural production: objects, buildings, cities and visual communication. In this context is manifested the intention for the creation of a University of Design, founded on the practice of investigation and studio research, thus overcoming the boundaries of a project scale in a school of architecture, limited between the realization of a building scale and, at most, of a city. To understand this generalist and plural outlook becomes a contribution to the discussion on the formation of contemporary architects and their awareness and instrumentalization for action before the complex professional demands of present day societies. PORTUGUÊSO artigo apresenta e discute uma experiência no Brasil de método e ensino de projeto de arquitetura, elaborado pela Faculdade de Arquitetura e Urbanismo da Universidade de São Paulo, a FAU USP. Referimo-nos a uma Reforma Pedagógica proposta no ano de 1962 e as suas consequências à formação dos arquitetos brasileiros. Conhecida como a Reforma de 1962 e tendo como seu líder, associado a outros professores, o arquiteto e professor João Batista Vilanova Artigas (1913-1985), o novo modelo proposto de método de ensino de projeto passou a ser adotado, sob alguns aspectos, mas não todos, pela maior parte das Faculdades de Arquitetura e Urbanismo brasileiras. A reforma liderada por Vilanova Artigas propunha uma superação dos métodos de ensino de projeto baseados ou no modelo tradicional de composição de arquitetura, via Escolas de Belas Artes, ou então naqueles de formação de arquitetos-engenheiros, via Escolas Politécnicas. O método de ensino proposto iria se basear em novos parâmetros de compreensão da prática da arquitetura, apostando em uma formação generalista do arquiteto, instrumentalizando-o a atuar nas várias escalas de produção arquitetônica: objetos, edifícios, cidades e comunicação visual. Nesse contexto manifesta-se a intenção de criação de uma Universidade do Projeto, fundada na prática de investigação e na pesquisa do ateliê, superando assim o limite da escala de projeto de uma Faculdade de Arquitetura, limitada entre a realização da escala do edifício e, quando muito, da cidade. Compreender essa formação generalista e plural coloca-se como contribuição à discussão da formação do arquiteto contemporâneo e a sua sensibilização e instrumentalização para ação frente às complexas demandas profissionais das sociedades atuais.


2016 ◽  
Vol 861 ◽  
pp. 369-375
Author(s):  
Mária Budiaková

This paper is focuses on the evaluation of the indoor climate in the small university lecture hall. Providing the optimal parameters of thermal comfort in the interiors of a university is immensely important for the students of the university. Fulfilling these parameters is inevitable not only for the physiological needs of students but also for the required performance of students. Reconstruction took place in the small university lecture hall. The original windows were exchanged for the modern wood tight windows. Experimental measurements were carried out in the winter season in 2016 in this small university lecture hall in order to evaluate the thermal comfort after the reconstruction. The device Testo 480 was used for the measurements. Obtained values of air temperature, air relative humidity, air velocity, globe temperature and indexes PMV, PPD are presented in the graphs. Heating, operation and architectural design of the small university lecture hall were evaluated on the basis of the parameters of thermal comfort. In the conclusion of this paper, there are principles how to design new small university lecture halls. Furthermore, there are presented recommendations how to operate the existing small university lecture halls.


Author(s):  
Tristan H. Lambert

A reductive radical cyclization of tetrahydropyran 1 to form bicycle 2 using iron(II) chloride in the presence of NaBH4 was reported (Angew. Chem. Int. Ed. 2012, 51, 6942) by Louis Fensterbank and Cyril Ollivier at the University of Paris and Anny Jutand at the Ecole Normale Supérieure. The enantioselective conversion of tetrahydrofuran 3 to spirocycle 5 via iminium ion-catalyzed hydride transfer/cyclization was developed (Angew. Chem. Int. Ed. 2012, 51, 8811) by Yong-Qiang Tu at Lanzhou University. Daniel Romo at Texas A&M University showed (J. Am. Chem. Soc. 2012, 134, 13348) that enantioenriched tricyclic β-lactone 8 could be readily prepared via dyotropic rearrangement of the diketoacid 6 under catalysis by chiral Lewis base 7. A dyotropic rearrangement was also utilized (Angew. Chem. Int. Ed. 2012, 51, 6984) by Zhen Yang at Peking University, Tuoping Luo at H3 Biomedicine in Cambridge, MA, and Yefeng Tang at Tsinghua University for the conversion of 9 to the bicyclic lactone 10. In terms of the enantioselective synthesis of β-lactones, Karl Scheidt at Northwestern University found that NHC catalyst 12 effects (Angew. Chem. Int. Ed. 2012, 51, 7309) the dynamic kinetic resolution of aldehyde 11 to furnish the lactone 13 with very high ee. Meanwhile, Xiaomeng Feng at Sichuan University has developed (J. Am Chem. Soc. 2012, 134, 17023) a rare example of an enantioselective Baeyer-Villiger oxidation of 4-alkyl cyclohexanones such as 14. The diastereoselective preparation of tetrahydropyran 18 by Lewis acid-promoted cyclization of cyclopropane 17 was accomplished (Org. Lett. 2012, 14, 6258) by Jin Kun Cha at Wayne State University. Stephen J. Connon at the University of Dublin reported (Chem. Commun. 2012, 48, 6502) the formal cycloaddition of aryl succinic anhydrides such as 18 with aldehydes to produce γ-butyrolactones, including 20, in high ee. The stereodivergent cyclization of 21 via desilylation-induced heteroconjugate addition to produce the complex tetrahydropyran 22 was discovered (Org. Lett. 2012, 14, 5550) by Paul A. Clarke at the University of York. Remarkably, while TFA produced a 13:1 diastereomeric ratio in favor of the cis diastereomer 22, the use of TBAF resulted in complete reversal of diastereoselectivity.


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