Lateral performances of traditional wooden frame with loose penetrated mortise-tenon connection and column foot models

2021 ◽  
pp. 103793
Author(s):  
Pan Yu ◽  
Qingshan Yang ◽  
Siu-seong Law
Keyword(s):  
Wooden Frame

Characterizing the convective heat exchange with plastic shading nets under natural arid conditions

2019 ◽  
pp. 11-20
Author(s):  
Ahmed M Abdel-Ghanya ◽  
Ibrahim M Al-Helal
Keyword(s):  
Wind Speed ◽  
Thermal Radiation ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Convective Heat Exchange ◽  
Radiative Properties ◽  
Wooden Frame ◽  
Arid Conditions ◽  
Air Temperatures ◽  
Radiation Fluxes

Plastic nets are extensively used for shading purposes in arid regions such as in the Arabian Peninsula. Quantifying the convection exchange with shading net and understanding the mechanisms (free, mixed and forced) of convection are essential for analyzing energy exchange with shading nets. Unlike solar and thermal radiation, the convective energy, convective heat transfer coefficient and the nature of convection have never been theoretically estimated or experimentally measured for plastic nets under arid conditions. In this study, the convected heat exchanges with different plastic nets were quantified based on an energy balance applied to the nets under outdoor natural conditions. Therefore, each net was tacked onto a wooden frame, fixed horizontally at 1.5-m height over the floor. The downward and upward solar and thermal radiation fluxes were measured below and above each net on sunny days; also the wind speed over the net, and the net and air temperatures were measured, simultaneously. Nets with different porosities, colors and texture structures were used for the study. The short and long wave’s radiative properties of the nets were pre-determined in previous studies to be used. Re and Gr numbers were determined and used to characterize the convection mechanism over each net. The results showed that forced and mixed convection are the dominant modes existing over the nets during most of the day and night times. The nature of convection over nets depends mainly on the wind speed, net-air temperature difference and texture shape of the net rather than its color and its porosity.

Füchsische Poetologie. Zur Spiegelfiktion im Reynke de Vos (1498)

POETICA ◽  
2020 ◽  
Vol 50 (3-4) ◽  
pp. 193-218
Author(s):  
Hannah Rieger
Keyword(s):  
Early Modern ◽  
Early Modern Period ◽  
Political Influence ◽  
Rhetorical Strategies ◽  
Ancient Rhetoric ◽  
Wooden Frame ◽  
Legal Proceedings ◽  
Middle Low German ◽  
Specific Material

Abstract The Middle Low German Beast Epic Reynke de Vos (1498) is about two legal proceedings against the fox Reynke, who is charged by the other animals with the tricks he played on them. When he is sentenced to death, Reynke defends himself by delivering speeches that are constructed as described in ancient rhetoric. Part of those speeches is Reynke’s lie about his treasure, which he would give to the lion if he pardoned him. Reynke describes three pieces of jewellery as part of this made-up possession, one of which is a mirror. When Reynke describes it, he also tells Aesopic fables that are carved into its wooden frame. His fictional artefact, especially the interplay of its specific material and the content of the fables told, has a poetological level. In his description, Reynke hybridizes the political discourse of the early modern period, in which the virtue of prudentia becomes more and more important, with the rhetorical competence to deliver speeches and tell fables. In his fiction of the mirror he draws up a poetological draft that combines the role of a rhetor in court with his well-known properties of being clever and cunning. By describing the artefact, Reynke shows how to use rhetorical strategies, especially to tell fables, as an instrument to gain acceptance and to acquire political influence.

scholarly journals Percutaneous transhepatic biliary puncture simulator: a cord network prototype

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Rubén Lopez Benítez ◽  
Tomás Reyes del Castillo ◽  
David Benz ◽  
Carsten Fechner ◽  
Lorant Szabo ◽  
...  
Keyword(s):  
Training Session ◽  
Lower Lobe ◽  
Biliary Tree ◽  
Training Model ◽  
Polystyrene Foam ◽  
Wooden Frame ◽  
Biliary Ducts ◽  
Hand Coordination ◽  
Radiology Residents ◽  
Positive Results

Abstract Background The aim of this study was to present a percutaneous transhepatic biliary puncture simulator that can be used without radiation exposure and that reflects the conventional anatomy of the biliary ducts and its vicinity structures. Methods An anatomically based model of the biliary tree was developed using a cord network fixed to a wooden frame. The skin, ribs, intercostal muscles, and right lower lobe pleura were simulated using foam sponge, plastic tubes, a polystyrene foam panel, and an air pad, respectively. For the puncture, we used a 20-G Chiba needle and a wire with distal double arches; these were used to troll a cord, simulating the successful puncture of a bile duct. A camera was also placed above the model to allow the trainees to train eye-hand coordination while viewing the image on a monitor in real time. The simulator was tested with 60 radiology residents to evaluate the confidence and skills transferability of the training model. Results After receiving an introduction of the system and 5 min of training under tutor surveillance, all participants were able to troll a cord of the biliary simulator by themselves in less than 4 min. Only one participant punctured the simulated pleura. The participants’ evaluations showed positive results, with increased user confidence and skills transferability after the training session. Conclusions This proposed simulator can be an effective tool to improve a trainee’s confidence and competence while achieving procedural and non-procedural interventional radiology skills related to the liver. Trial registration Retrospectively registered

Numerical Simulation of Airborne Salt Particle Behavior in Dry Gauze Method Using Porous Media Model

2021 ◽  
pp. 1-37
Author(s):  
Yuta Tsubokura ◽  
Kyohei Noguchi ◽  
Tomomi Yagi
Keyword(s):  
Porous Media ◽  
Flow Field ◽  
Collection Efficiency ◽  
Steel Structures ◽  
Salt Particle ◽  
Wooden Frame ◽  
Collection Device ◽  
Porous Media Model ◽  
Corrosion Of Steel ◽  
Porous Media Method

Abstract Airborne salt accelerates the corrosion of steel materials and, thus, must be quantitatively evaluated for the management of steel structures. In Japan, the dry gauze method, which uses a gauze embedded in a wooden frame, is often used to evaluate the amount of airborne salt. However, its collection efficiency for salt particles has not been verified owing to the complex airflows around the device. Therefore, as a first step to clarify the collection efficiency, the authors simulated the flow field around the collection device using computational fluid dynamics. In this study, the gauze was modeled as a porous medium to reduce the computational costs. Wind tunnel tests were performed to obtain the pressure loss coefficients of the gauze, which is necessary for the porous media method. Subsequently, particle tracking was performed in the calculated flow field, and the collection efficiency was evaluated under the condition of a filtration efficiency of 100%. The flow fields around the device were accurately reproduced using the porous media model, which considered both the tangential and normal resistances of the gauze. This result suggests that the tangential resistance must be considered in the porous media model when the porosity of an object is small, even if the thickness is small. The dependence of collection efficiency on wind speed and direction was quantitatively evaluated. The results showed that the collection efficiency was greatly affected by the complicated flow field around the device due to the combination of the gauze and wooden frame.

scholarly journals RESEARCH OF THE SETTLEMENT OF PRAGUE-KORCHAK CULTURE IN RIVNE CITY

2021 ◽  
Vol 40 (3) ◽  
pp. 122-130
Author(s):  
O. P. Voitiuk ◽  
B. A. Pryshchepa
Keyword(s):  
Middle Ages ◽  
Main Type ◽  
Residential Buildings ◽  
Medium Size ◽  
Detection Level ◽  
Foundation Pit ◽  
Wooden Frame ◽  
The Earth ◽  
And Storage ◽  
Clay Pots

The paper introduces into scientific circulation the results of research of the objects of Early Slavs of the Prague-Korchak culture in a multi-layered settlement in the southern part of Rivne city. The settlement is located on the eastern shore of the Basiv Kut Reservoir, on the oval hill measuring 220 Ч 120 m. The first finds of the Early Middle Ages were discovered here by V. K. Piasetskyi in 1989. In 2019, the excavations were carried out on the area of 590 m2; the housing and storage pit of the Prague-Korchak culture have been discovered. The quadrangular foundation pit of 3.5 Ч 3.5 m square was sunk into the earth to the 0.3—0.4 m from detection level. The remains of stone stove made on the wooden frame were located in the northern corner of the dwelling. Such semi-dugout dwellings with the stove in one of corners was the main type of residential buildings in the population of the Prague-Korchak culture. The pillar holes found in the corners of the foundation pit and in the middle of the walls indicate the frame-pillar construction of the wooden walls. Among the stones from the destroyed stove and on the earthen floor in the central part of the foundation pit of the dwelling the remains of nine clay pots were found. We managed to reconstruct the full profiles of seven of them; two else vessels are represented by the profiles of the upper parts. The pots from the dwelling have a conical body, weakly marked shoulder, scarcely marked neck and short rim. The surface of the item is insufficiently smoothed and bumpy. The admixtures in the clay are mostly of small and medium size, with added fireclay, grus and sand. By their size the vessels are divided into small (1), medium (5) and large (3). All pots from the dwelling belong to variants 1—3 of the first type according to I. P. Rusanova’s classification. This combination is typical of the early monuments of the Prague-Korchak culture. The analysis allows attributing the ceramic complex from Rivne to phaze 1 according to I. O. Havritukhin and to date it as belonging to the second half of 5th — mid-6th centuries. The settlement was not large; two or three farmsteads could simultaneously exist there. They were located at a distance of 100—150 m from each other.

scholarly journals APPLICATION OF EARTH AND STRAW MIXTURES IN MODERN BUILDING

2016 ◽  
Vol 1 (15) ◽  
Author(s):  
Ivan Hegediš ◽  
Neđo Đurić ◽  
Arpad Čeh ◽  
Golub Karaman ◽  
Danilo Vunjak ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Energy Consumption ◽  
Architectural Design ◽  
Mechanical And Thermal Properties ◽  
Structural Elements ◽  
Wooden Frame ◽  
Energy Consumption Reduction ◽  
Consumption Reduction ◽  
Modern Building

Building with earth is widespread and still mostly based on traditional experiences. Increasing demandsin energy consumption reduction during the construction and exploitation of buildings put more andmore in the focus the good features of houses built with earth.Testing of earth mixtures with othernatural materials showed that it can get even a quality of bricks, which indicates the lack of appropriatestandards for this type of construction.Testing are performed with mixes of earth and straw intended forrammed earth and adobe construction.This method of preparation and construction applies in alternate construction with straw bales and it isalso used in the construction of prefabricated panels with wooden frame filled with a mixture earth andstraw where it is possible to build prefabricated structures or as a filling of wall screens in skeletalstructural system of larger dimensions and number of floors.Laboratory tests have shown that the mechanical and thermal properties of this material fulfilled thehigh demands for the construction of modern buildings. Based on the presented results it can proceedthe development and testing of structural elements for that kind of building.Also, based on results, in the article the authors presented possibilities of architectural design ofvarious building possibilities of objects, as practical examples of prefabrication applied in somecountries.

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