bluuebunny/crossref_metadata_2025 huggingface dataset:
Proposal for a Submerged Floating Tube Bridge as part of the Bømlafjord crossing
Authors: Eidem Mathias Egeland , Sekse Jorunn , Minoretti Arianna
Published: February 2021

A proposal for a Submerged Floating Tube Bridge as part of a scheme for a new and improved fixed link along the E39 route, across the Bømlafjord in Norway, is presented.

The existing crossing is not able to satisfy the previsions of the increase in traffic and the new rules on the road alignment and gradient. The new requirements, including the need of a carriageway with two lanes for each direction, imply a complete replacement of the existing tunnel with a longer one. The possibility to substitute the new bridge, necessary for the northern part of the crossing, with a SFTB (Submerged Floating Tube Bridge) allow to reduce the parts of the tunnel in the southern part that have to be substituted. The advantages of the proposed scheme for the crossing are evaluated and discussed. A comparison, in terms of costs, of the different solutions for the design is presented.
Experimental Studies of Controlling Thermal Cracks in Mass Concrete Foundation by Circulating Water
Authors: Liu Wenchao , Cao Wanlin , Zhang Jianwei , Qiao Qiyun , Yin Fei
Published: February 2021

This paper summarizes an engineering experience of solving the problem of thermal cracking in mass concrete by using a large project, Zhongguancun No.1 (Beijing, China), as an example. A new method is presented for controlling temperature cracks in the mass concrete of a foundation. The method involves controlled cycles of water circulating between the surface of mass concrete foundation and the atmospheric environment. The temperature gradient between the surface and the core of the mass concrete is controlled at a relatively stable state. Water collected from the well-points used for dewatering and from rainfall is used as the source for circulating water. Mass concrete of a foundation slab is experimentally investigated through field temperature monitoring. The temperature field of the mass concrete during the entire process of heat of hydration are analyzed in detail. The proposed method provides an alternative practical basis for preventing thermal cracks in mass concrete.
Folded plate action for concrete box girder bridges
Authors: Vergoossen Rob , Hagenaars Peter , de Winter Eelco , de Boer Martijn
Published: February 2021

As already described in begin eighties in Structural Engineering Document 1 “Concrete Box-girder Bridges” [1] the Folded Plate Action of torsion stiff concrete box-girder bridges cannot be disregarded. But nowadays many designs are made by 3D Finite Element Analysis using 2D plate/shell elements, although the number of loading cases described by the codes has increased and the computer programs have become black boxes.

Despite these Finite Element Analyses the theory of Folded Plate Action can still be useful. With the folded plate theory the governing loading situations can be determined and thus the number of loading situations in a 3D model can be reduced and the output of the 3D model can be checked. Also for the structural assessment of existing structures the theory can be very useful.
Analysis of the Shear Strength of Joints in Segmental Prestressed Concrete Bridges
Authors: Song Shoutan , Yang Dong , Tu Yongming , Sas Gabriel , Blanksvärd Thomas , Elfgren Lennart
Published: February 2021

Joints in segmental prestressed concrete bridge (SPCB) are weak links and shear failures are likely to take place under loads. Determining the shear strength is an important part in the design of a SPCB. The shear strength in the joint relates closely to the joint form (as dry joints, epoxy joints, flat joints and keyed joints). The strength can be divided into three main parts: (1) The strength of the dry plane connection, known mainly as concrete surface friction; (2) The strength of the epoxy plane connection; and (3) The strength of the shear key root. This paper analyzes the failure mechanism and shear strength of these three parts .It also considers the influences of the shear key size and the seam height to shear strength, and establishes calculation formulas of the joint section strength in a united form. This provides a guide for the joint design in precast segmental bridges.
Mechanical performance and cost correlation of Ultra High Performance Fiber Reinforced Concrete (UHPFRC)
Authors: Paschalis Spyridon , Lampropoulos Andreas
Published: February 2021

Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) is a material which is characterized by enhanced mechanical properties. The properties of the material are highly depended on the composition of the mix and the curing regimes. However, the final mix design should combine both high mechanical properties and cost effectiveness. In the present study an extensive experimental program takes place and the mechanical properties of UHPFRC, for different percentages of steel fibers as well as different curing regimes, are investigated. Finally, a cost analysis is performed and a discussion about the relation between the cost and the mechanical properties is made.
Engineering Assessment Method for Anchorage in Corroded Reinforced Concrete
Authors: Blomfors Mattias , Zandi Kamyab , Lundgren Karin , Larsson Oskar , Honfi Dániel
Published: February 2021

There is an increasing need for reliable methods to assess load-carrying capacity and remaining service life of existing infrastructure. Several previous research projects have resulted in a verified, simple 1D model for assessment of anchorage in corroded reinforced concrete structures. Previous verification has involved both experiments and detailed 3D NLFE analyses. To further develop the 1D model it needs to be extended to comprise more practical situations. In order to facilitate an efficient extension procedure in the future, the size of 3D NLFE model that is required to capture the bond behaviour between corroded reinforcement and concrete is investigated. Beam-end models and models of sub-sections were studied, and the results in terms of bond stress and crack pattern were compared. Preliminary results indicate good agreement for some situations; however for some cases a section model seems to overestimate the capacity.
Evaluation of Residual Prestress Force in a Concrete Girder Bridge
Authors: Bagge Niklas , Nilimaa Jonny , Elfgren Lennart
Published: February 2021

When assessing the structural behaviour of prestressed concrete bridges, understanding the level of prestressing is crucial. However, for existing structures, this is usually an unknown parameter and the literature only describes a few methods of experimentally determining the residual prestress forces. For this paper, a non-destructive testing approach has been evaluated based on testing of a multi-span continuous girder bridge. The method, consisting of in-situ measurements in combination with finite element (FE) simulations, revealed prestress levels in the range 25 % to 82 % of the reinforcement steel yield strength, depending on the section tested. A comparison with theoretically calculated residual prestress forces, taking into account friction and time- dependent losses, indicated values of the same order but with some inconsistencies.
Proposal of an Equation of Stress in PS Strands at Flexural Strength
Authors: Park Jae-Hyun , Cho Jae-Yeol , Koh Hyun-Moo
Published: February 2021

The PS strand which has a tensile strength of 1,860 MPa was commercialized in the 1980s, and the tensile strength of strand had not been increased for about the past 30 years. Recently, 2,160 MPa and 2,400 MPa high-strength PS strands were developed by Korea government in 2008 and 2011, respectively. Also, net tensile strain concept has been introduced in recent version of ACI 318. However, simple equations for designers to predict the stress in PS strands at flexural strength proposed at existing design codes such as ACI 318 and CSA A23.3 do not reflect the influence of these trends. This study examined the applicability of high-strength PS strands to existing design equations of stresses in PS strands at flexural strength proposed in ACI 318-14 and CSA A23.3-14. The results show that the existing equations over-estimate the stresses for flanged sections and high-strength PS strands. With the based on the results, modified equation was proposed.
Experimental assessment of a new steel hysteretic device: Crescent Shaped Brace
Authors: Dib Antoine , Palermo Michele , Silvestri Stefano , Trombetti Tomaso
Published: February 2021

The Crescent Shaped Brace (CSB) is a new steel dissipative device recently proposed by some of the authors within the context of Performance Based Seismic Design (PBSD). Contrarily to the conventional concentric stiff diagonal braces, the CSB allows the practical designer to choose the lateral stiffness independently from the yield strength of the device, due to its peculiar ad-hoc shape. In previous studies, analytical formulations and first experimental tests were described. In the present paper, the main results of further experimental tests conducted on scaled CSB specimens of full circular cross-section under both monotonic pseudo-static and cyclic loads are presented. The results of the experimental tests are compared with analytical formulations.
Almonte Viaduct. Detailed Design
Authors: Arribas David , Bernal Pablo , Pérez José María , González José Ignacio
Published: February 2021

Given the scale involved, construction of this bridge necessitated more comprehensive engineering and detailing for some of its components. These tasks were performed by the builder’s staff to ensure coordination as full as possible between the design and the construction teams, as described in this paper.
Design of Ponte dei Congressi in Rome, Italy
Authors: Capellán Guillermo , Arenas Juan José , Siviero Enzo , Di Marco Roberto , Di Marco Fabio , Ascarelli Gianni
Published: February 2021

The Ponte dei Congressi is a new bridge designed for the city of Rome over the River Tiber. This design is developed by the professional association of engineers and architects who won the international design competition held for this bridge in 2001. 15 years later this project is becoming a reality, with construction due to start in 2016. The design has been adapted and renewed according to the new conditions of the road and traffic design planned in the area. The new design is a steel bowstring arch bridge with 175 m main span, which holds a 24,5 m wide deck, and two side footbridges that are suspended from the deck at a different level, in order to a link the footpaths and bicycle lanes at both river banks. It forms part of a large road connection operation improving South West access to the city of Rome from Fiumicino Airport.
La Florida Suspension Bridge. Oviedo, Spain.
Authors: Arenas Juan José , Capellán Guillermo , Godoy Alejandro , García Marianela , Ruiz Juan , Guerra Santiago
Published: February 2021

La Florida Bridge is a €5,9 million project promoted by Oviedo City Council to provide a new link between “La Florida” and “Western Park” neighbourhoods. The final design, developed by Arenas & Asociados, represents an innovation in urban bridges, solving the connection between both areas with a flying semi-circle roundabout suspended from its inner edge by a system of hangers.

The main novelty of this solution is that hangers and backstays are fixed to the same suspension system, composed by two main cables making a loop and anchored to an articulated mast. The structure is completed with a post-tensioned concrete approach viaduct, a composite connection span between roundabout and viaduct, two cantilever footbridges arising from the concrete deck and flying parallel to the roundabout, and finally, a concrete ring as counterweight for the backstays anchorage.
Tradition and Innovation in San Ignacio´s Bridge on the New Island of Zorrotzaurre, in Bilbao
Authors: Lorea Ana Irene , Saiz Sergio
Published: February 2021

San Ignacio’s Bridge is a singular structure in which the materials were determined by Bilbao’s industrial tradition of steel but optimized by using the latest constructive innovations in order to design a technological and slender arch bridge.
Viaduct over River Almonte. Design and Analysis
Authors: Arenas Juan José , Capellán Guillermo , Martínez Javier , Merino Emilio , Guil Ysabel , García-Arias Pascual
Published: February 2021

The High Speed Railway (HSR) link Madrid - Extremadura crosses over River Almonte with a great arch viaduct of high - performance concrete. The main span of this structure is 384 meters.

This paper explains the exceptional techniques and structural analysis outside the usual engineering work that have been developed to reach its design and construction. These studies include the selection of the antifunicular arch axis taking into account construction process and train loads, geometric and material nonlinear analysis, dynamic analysis and aerolastic behaviour.
Copenhagen Inner Harbour Bridge
Authors: Bahra Amar , Firth Ian
Published: February 2021

The new Inner Harbour Bridge in Copenhagen is innovative both in its method of opening and a number of its design features. The moving bridge comprises two steel box girders that retract by sliding between fixed concrete approach spans. The steel box girders are of a highly unusual form involving plan curvature, continually changing cross sections and a faceted – or triangulated – inner web. Furthermore, because of the support arrangement, the girders go from cantilevering to simply-supported conditions over the course of an opening cycle.

The dynamic response of the box girders, with 35 m cantilevering spans in the service condition, presented a challenge which was addressed in the design by a combination of rationalised design criteria and the application of a series of tuned mass dampers.

The project has been delayed for a variety of reasons, not least due to the original contractor going into liquidation part way through, and the fixed concrete spans were modified by adding a new composite top layer of reinforced concrete following the original casting.

This paper touches briefly on the unique form and opening mechanism of the bridge and then turns to the details of some of the novel structural aspects.
Design and Construction of Pont Schuman, Lyon
Authors: Stross Oliver , Sanders Paul
Published: February 2021

Pont Schuman is an elegant new crossing of the River Saône in Lyon, France. The scheme, with an overall cost of around €20Million, was developed as part of an international design competition. The bridge carries a two lane dual carriageway and features a shallow concrete deck suspended from slender un-braced arches. Triangular in cross section, the arches are particularly striking in that they are twisted continuously along their length. This requires two of the main plates that form the arches to be warped, leading to significant challenges in design and fabrication.

A unique erection method was used in which the arches were temporarily hinged at their springing points to enable the spans to be transported via a barge from a preassembly area along the Saône under a number of existing crossings.
London 2012 Olympic Stadium Transformation: Part 2: Engineering the Extraordinary
Authors: Birchall Matthew , Mccormick Fergus
Published: February 2021

The London 2012 Olympic Stadium was a popular success and ideas were developed to enhance its capability after the Olympics. Commercial discussions concluded with West Ham FC becoming a key tenant and requesting roof covering over spectators that would be located close to the pitch. This resulted in considerations for an extraordinary covering of 49000m², double the original.

The paper explains how previous studies (see Ref 1) helped inform an engineering vocabulary of key issues; however the paper describes how a new radically inventive solution was necessary. It presents the extraordinary engineering challenges such as highly complex form-finding enabling a super-tuned structure to work within the existing constraints to maximise potential of the original structure and deliver a new iconic design faithful in character to the popular Olympic design.
Current research and development in bridges for high-speed railways in Sweden
Authors: Ülker-Kaustell Mahir , Östlund Johan , Andersson Andreas
Published: February 2021

Short and stiff bridges are generally quite sensitive to the dynamic effects arising from train-bridge interaction. In the Swedish landscape, such bridges are common and represent 60-70% of the total bridge stock. Recent research has clearly shown that simple structural models may result in highly conservative predictions of the dynamic response of such structures. This has a large impact on the economy of these structures both for existing railway lines on which an increased maximum allowable speed could lead to a more efficient operation and for the design of new bridges on dedicated high-speed railways. This paper describes two promising modelling details that could lead to models that more accurately predict the dynamic response of such bridges; dynamic soil- structure interaction and the influence of rolling and sliding friction in bridge bearings. Currently, several research and development projects are aiming at increasing our understanding of these phenomena and at deriving simplified models that include these details in practical bridge design. Bridges with integrated abutments are common in Sweden as they provide an economic solution for many short bridges. However, simple models, which exclude the interaction between the abutments and the embankments, typically lead to theoretical dynamical responses that exceed the acceleration criteria given by the Eurocode. Recent research indicates that by modelling the interaction with the embankment, a more accurate and less conservative response may be obtained. Research regarding the influence of friction in bridge bearings has shown that a considerable additional damping can exist in bridges resting on either rolling or sliding bearings. An ongoing project attempts to quantify this additional damping and derive phenomenological models to include this effect in dynamic analyses of railway bridges in particular and bridges in general.
Icing of Bridge Cables – State-of-the-Art - Review
Authors: Gabler Magdalena Maria
Published: February 2021

Cable icing can result in additional dead load and increase an impact surface for wind loads. But most importantly, ice chunks, under some meteorological conditions, can fall down from cables onto the roadway causing a major damage to the traffic on the bridge. The purpose of this paper is to present a general overview of the investigations that have been made to protect bridge cable from damage caused from ice accretion. That includes understanding of icing fundamentals caused by freezing precipitation and in-cloud icing. Also, results of experimental wind tunnel tests, which have been performed on horizontal, vertical and inclined cylinders will be discussed. Finally, different de-icing and anti-icing techniques, such as active removal systems (mechanical, thermal) and passive methods -based on natural forces as well as monitoring systems are being reviewed.
Resistance to fatigue and prediction of lifetime of wire tendons cast into concrete up to 108 cycles
Authors: Heinrich Jens , Heeke Guido , Maurer Reinhard , Müller Christine
Published: February 2021

Usually for verification of compliance, the fatigue resistance of prestressing steel is determined from tests of naked specimens at 2 million cycles. However, for design the fatigue resistance of tendons cast into concrete, is substantially lower. To verify the resistance of existing older prestressed concrete bridges and for the design of new bridges, S-N curves of prestressing steel in curved steel ducts embedded into concrete are needed. In bridges, the load cycles due to heavy vehicles may rise up to about 10E8 cycles or even more. Previous tests with curved tendons in steel ducts primarily cover a range of up to about 20 million cycles. Thereby no real endurance strength has been estimated jet. Hence the S-N curves given in Eurocode 2 and Model Code 2010 are defined hypothetically for a range from 106 up to 108 and are not based on test results. The reason is that experimental investigations in a range up to 108 cycles are very expensive and also demand a very long duration.

Essential progress results from the development of an optimized test setup that allows a frequency of 10Hz for the applied load cycles. Therewith, the experimental investigations up to 108 cycles have been done by means of prestressed concrete beams with embedded curved tendons in steel ducts.

Furthermore, procedures to also forecast the lifetime in the case of very low stress ranges respectively the remaining lifetime of a running test had been developed in conjunction with an interdisciplinary research project. The procedures are based on refined statistical analysis of the extensively measured data including increase of crack width, strains, sound emission etc. Additionally the analysis of the latter leads to some interesting new perceptions.
Comparison of Alternative Floater concepts for a 2-span Suspension Bridge supported by a Tension Leg Platform
Authors: Papinutti Mitja , Sello Joerg , Bruer Arne , Marley Mathias , Veie Johannes , Hellgren Holtberget Simen
Published: February 2021

As part of the E39 fjord crossing project The Norwegian Public Roads Administration (NPRA) performs a feasibility study of crossing the 2000m wide and 500m deep Halsafjord with a fixed link. One possible crossing alternative is a two span suspension bridge supported by a Tension Leg Platform (TLP) mid-fjord. The TLP technology is adopted from the offshore industry where it has been proven to be an effective concept for floating constructions at large water depths. Two floater concepts, a 4-legged steel floater and a monoleg concrete floater with a large submerged disk, are considered. The two floater concepts have similar stiffness properties, but large difference in inertia and shape. The structural response in a severe storm is calculated for the bridge subject to wind, wave and current forces, comparing the motion behaviour of the two floater concepts. Analyses are performed in time domain in software package RM Bridge, taking hydrodynamic, hydrostatic and aerodynamic load effects into account.
Meet the Challenges of the Fehmarnbelt Fixed Link
Authors: Pompeu-Santos Silvino
Published: February 2021

This paper presents an alternative TBM tunnel solution for the Fehmarnbelt Fixed Link, based on two new concepts for the construction of tunnels: the TMG concept for rail tunnels and the TMF concept for road tunnels. The application of these concepts in the project allows a solution that, in addition to low environmental impact (which is typical of the TBM tunnels), have improved safety during operation and very low cost.
Challenges in the Design and Construction of the Queensferry Crossing
Authors: Curran Peter
Published: February 2021

The Queensferry Crossing is Scotlands largest infrastructure project in a generation. It will replace the existing Forth Road Bridge which has suffered deterioration to many components in recent years. Predictions of cable deterioration to the existing suspension bridge indicated that weight restrictions were likely towards the end of this decade, and the loss of such a vital link was considered intolerable.

This paper explains the background to the project and describes key aspects and challenges in the design of this unique bridge, from the designer’s perspective, with a focus in particular on the challenges in the design and erection of the bridges superstructure which is presently under construction.
Line 5 Riyadh Metro Tunnel and Deep Underground Stations
Authors: Lorenzo-Romero José-Maria , Sanchez-Jimenez Jose-Luis , Gomez Elvira Alberto
Published: February 2021

As part of the future Riyadh Public transport network in Arabia, ADA (Arriyadh Development Authority) has planned the development of an extensive Metro system, serving the city of Riyadh with 6 Metro lines. The package RM3 of Riyadh Metro project comprises lines 4, 5 and 6. FAST consortium has been awarded for the design and construction of the package RM3. TYPSA is part of FAST consortium since the Tender stage and it is in charge of the detailed design of Line 5.

In this article the authors explain the key project topics and current construction stage of the line 5, designed entirely by TYPSA.

Line 5 is a totally underground line, with a first section in Cut&Cover Tunnel and the main part of the line in TBM tunnel, with a single tube section of 8,70m inner diameter. 12 Deep Underground Stations are spread along the line, that runs under one of the busiest Riyadh streets, King Abdulaziz Road.
Optimal Design of Toggle Brace Dampers for the Wind Resistance Design of Super Tall Buildings
Authors: Ma HaoJia , Zhao Xin
Published: February 2021

With the increase of building height, the story drift induced by wind load become increasingly prominent for the structural design of super tall buildings. Viscous dampers with motion amplification device, for example toggle brace damper system, have been proved to be an effective device to absorb and dissipate large amounts of energy from wind loads or earthquake actions with a small deformation. In this paper, a new optimal design method to find the optimal placement, number and damping coefficient of viscous dampers for the wind resistance design of super tall buildings is proposed. It addresses the problem of minimizing the number and damping coefficient of viscous dampers subject to the additional damping ratio, maximum power, and maximum damping force constraints. The theoretical basis and design process for finding optimum geometry parameter of the toggle brace damper system are also developed . A real 250 meter super tall residential building project will be employed to illustrate the effectiveness and applicability of the proposed optimal design method of toggle brace dampers for the wind resistance design of super tall buildings.
Life Cycle Cost Assessment of Integrated Structure-Viscous Damper System for Tall Buildings
Authors: Zhao Xin , Li Hao
Published: February 2021

Earthquake action and wind load are controlling factors for structural design of tall buildings. Integrated structure-viscous damper system can reduce the dynamic responses under lateral loads through the introduction of viscous dampers, and thus the structural performances of lateral system, namely human comfort performance under wind load, stiffness and strength performances under wind load and earthquake action, can be significantly improved. There are two design methodologies for integrated structure-viscous damper system, namely the performance upgrading design (PUD) method and integrated optimal design (IOD) method. PUD method considers the performance improvement due to the introduction of viscous dampers, but the performance redundancies induced by performance improvement are not further optimized. Although the improvements of structural performance considered by PUD method can reduced the operation costs, the construction costs will be increased due to the additional viscous dampers installed. IOD method, however, conducts further integrated optimization on the performance redundancies of structures caused by the introduction of viscous dampers. Since the cost reduction due to integrated optimization is commonly higher than the cost of viscous dampers, both construction costs and operation costs can be reduced. Either PUD method or IOD method has to assess the life cycle costs of the integrated structure-viscous damper system. This paper proposed a life cycle cost assessment (LCCA) method to evaluate the life cycle costs of integrated structure-viscous damper system. The life cycle costs are composed of construction cost, operation cost, failure cost and demolition cost. The construction cost is composed of structural cost and device cost of viscous dampers. The operation cost is composed of maintenance costs of structural system and viscous dampers. The failure cost is composed of the failure costs of human comfort, stiffness and strength under wind loads, and the failure costs of stiffness and strength under earthquake actions. The feasibility and effectiveness of the proposed LCCA method are to be illustrated using a real 250m tall building project.
Safety of temporary stands
Authors: Vennetti Daniel , Honfi Dániel
Published: February 2021

The paper gives an overview of some relevant technical aspects related to temporary stands. Since these kinds of structures are often used by a large number of people, consequences of structural failure could be significant. However, the effort put into their design and maintenance is often less than in case of permanent structures. Furthermore, it is not always clear who bears the responsibility if accidents happen. The current study concludes that the structural behaviour of these systems is much more complex than one might think; therefore clear regulations, guidelines and approaches are needed. A major concern is the requirements for validation of structural performance by numerical modelling and testing. Improvements in standardisation also require further research in several areas, such as e.g. structural dynamics, nature of loads, requirements, human-structure interaction.
Temporary demountable structures
Authors: Soane Alastair , Cutlack John
Published: February 2021

The Advisory Group on Temporary Structures (AGOTS) has recently prepared edition four ofTemporary Demountable Structureson behalf of the Institution of Structural Engineers. Since 1985 previous editions have been the chief source for guidance on the procurement, design, and use of temporary demountable structures in the UK. Demountable structures are widely used for a variety of functions at public and private events and can be found at exhibitions, sporting events, musical concerts and social occasions. Some may carry substantial numbers of people during major events and structural safety is extremely important. The Olympic Games in London in 2012 saw the largest number of temporary structures ever used at a single event, and using the third edition of this Guide was one of the core requirements of the London Organising Committee for the Olympic and Paralympic Games (LOCOG). Since then the industry has seen a number of regulatory changes and the introduction of Eurocodes. The fourth edition embraces these.
Efficacy of cholecystectomy in patients with positive HIDA Scans with typical or atypical biliary pain: A retrospective study
Authors:   1,2,3Department of General Surgery, Peninsula Health, PO Box 52, Frankston, 3199, Victoria, Australia
Published: February 2021

Introduction: Our investigation aimed to discover the benefits of performing cholecystectomy in patients who had a positive or negative HIDA scan result, presented with either typical or atypical biliary pain. Methods: We performed a retrospective analysis of medical records of patients who had a HIDA scan at Peninsula Health between 2012 and 2017, those who had a HIDA scan and cholecystectomy for biliary pain were selected for this study, and prospective analysis of patient reported outcome post cholecystectomy included. Results: In the past five years, 190 patients had had a HIDA scan to investigate biliary pain without a structural cause. Of those 190, 65 had a positive HIDA result and 20 of these patients went on to have a cholecystectomy. Of the latter, 17 who reported typical biliary pain had their pain resolved post-surgery but 2 out of 3 patients with atypical biliary pain had ongoing pain despite surgery (1 did not respond). Of the 125 patients with a negative HIDA scan, 14 proceeded with a cholecystectomy. Twelve patients had pre-operative typical biliary pain and 5 of these continued to have pain post-operatively. Finally, 1 of the 2 patients with atypical pain continued to have ongoing pain post-surgery. Conclusion: In summary, in patients without a structural cause for biliary pain HIDA scans and patient’s symptoms greatly aid in the decision-making process whether to proceed with a cholecystectomy, as a negative scan should prompt further clinical investigation before proceeding with surgery.
A manifestação do “Prêmio de Beleza” na área de Ensino
Authors: Woiciekovski Edinéia , Dudeque Pianovski Vieira Alboni Marisa
Published: February 2021

Neste artigo, busca-se investigar se existe relação entre a beleza dos professores e a avaliação docente realizada pelos alunos, atribuindo vantagens aos professores percebidos como mais atrativos. Por meio de uma revisão de literatura, foram analisadas publicações que tratam do tema, buscando identificar se existe manifestação do “prêmio de beleza” em sala de aula e se ocorre maior incidência para um determinado gênero. Os resultados demonstraram que o nível de atratividade percebido nos professores impacta significativamente nas avaliações de ensino. Além disso, os artigos estudados revelam que,de modo geral, há maior incidência do “prêmio de beleza” para os homens, tendo as professoras mulheres recebido avaliações significativamente menores.
Ensino de Sociologia: processo de reintrodução no Ensino Médio brasileiro e os cursos de Ciências Sociais/Sociologia (1984-2008)
Authors: Bodart Cristiano das Neves , Azevedo Gustavo Cravo de , Tavares Caio dos Santos
Published: February 2021

O artigo evidencia os processos de reintrodução da Sociologia como disciplina obrigatória no ensino médio e de ofertas de cursos de Ciências Sociais no Brasil, observando correlações entre ambos e problematizando possíveis implicações. Para tanto, recorreu-se aos dados do Censo Escolar e do site e-MEC quanto aos cursos de Ciências Sociais e Sociologia, e a documentos estaduais. As evidências indicam que: i) a presença desses possibilitou a existência de militância pelo retorno da disciplina; ii) a reintrodução da Sociologia no ensino médio foi um processo que se deu nos estados da federação antes da Lei Federal nº. 11.684 de 2008, sendo resultado de um cenário de maiores oportunidades políticas à promoção de ações coletivas que envolveram diversos agentes e instituições.
Revisitando a historiografia africana: subsídios para a disciplina História da África nas licenciaturas
Authors: Diallo Cintia Santos , Lima Claudia Araújo de
Published: February 2021

O presente texto tem como objeto uma breve revisão bibliográfica da historiografia africana. Esse exercício se justifica, na medida em que, nos deparamos com o desafio de investigar a disciplina História da África dos cursos de licenciatura em História do Centro-Oeste, e precisamos de um parâmetro responder qual “História da África” é reproduzida nesses cursos. A obra referência no Brasil sobre a História da África, ainda é a monumental Coleção História da África, organizada pela Organização das Unidas para Educação Ciência e Cultura – (UNESCO), publicada originalmente da década de 1980, entretanto a coleção completa só foi disponibilizada no Brasil, em Língua Portuguesa em 2010, pelo Ministério da Educação – MEC, no âmbito das Políticas de Ações Afirmativas/Valorativas para Promoção da Igualdade Racial, implementadas a partir dos 2000.            Além dos capítulos 1, 2, 3 do volume I, da obra supracitada busquei em pesquisadores africanos, Cheikh Anta Diop, Joseph Ki-Zerbo, Valentim Yves Mudimbe, Achille Mbembe, Djibril Samb, Maodo, Gueye, Thierno Mouctar Bah, Kwame Anthony Appiah, Amadou Hampe Bá, elementos para compreender a Historiografia Africana e, assim responder uma das questões que norteiam a pesquisa, qual seja, o alinhamento teórico das disciplinas objeto da investigação.
Leitura e escrita na Educação Infantil: caminhos possíveis
Authors: Cintra Rosana Carla Gonçalves Gomes , Pires Jucileia Obregon , De Andrade Luci Carlos
Published: February 2021

O presente artigo é proveniente do curso denominado Questões em Torno do Ensino da Leitura e da Escrita na Escola, ministrado por Anne-Marie Chartier, vinculado ao projeto Currículo e avaliação, leitura e escrita: diálogos entre Brasil/França e Brasil/Portugal, aprovado pelo edital CAPES, Programa Escola de Altos Estudos - EAE Edital 14/2018. Aborda questões relativas ao ensino da leitura e da escrita na escola obrigatória. Adotamos a pesquisa bibliográfica utilizando como base teórica os textos utilizados durante o curso. O objetivo foi compreender e valorizar a inserção da leitura e escrita na infância, enquanto instrumento cultural e social. Os resultados alcançados foram positivos para a internacionalização dos programas de pós-graduação.
A construção das identidades profissionais docentes dos professores de informática da SEEDF
Authors: Machado Liliane Campos , Peixoto Anderson Gomes
Published: February 2021

O professor de informática, profissional que possui formação e capacidade de desenvolver o processo de ensino-aprendizagem no âmbito escolar, é oportuno para atender às demandas sociais de formação para a sociedade tecnológica. A construção da identidade deste docente tem gerado reflexões no que se refere a atender as exigências do uso de tecnologias e de suas transformações na sociedade. Esse artigo objetiva analisar a construção da identidade docente do professor de informática da SEEDF. A metodologia utilizada é a pesquisa bibliográfica e análise documental. Os principais resultados alcançados na pesquisa apontam que a construção da identidade docente é contínua e repleta de influências, entre elas a do contexto histórico, sendo possível aferir que é necessária uma valorização da formação e do professor de informática.
Efecto antioxidante de la miel de abeja sobre la carne de conejo almacenada en refrigeración
Authors: López-Velasco Daniel Salvador , Sosa-Montes Eliseo , Pro-Martínez Arturo , González-Cerón Fernando , Vargas-Galicia Artemio Jovanny
Published: February 2021

La oxidación de lípidos deteriora los alimentos, por lo que se usan antioxidantes sintéticos para disminuirla, sin embargo, estos compuestos en exceso poseen efectos carcinogénicos. Algunas plantas como el orégano, así como la miel de abeja, contienen antioxidantes naturales que no dañan la salud. Hasta el momento no se han encontrado registros del uso de la miel de abeja para disminuir la oxidación lipídica en carne de conejos. El objetivo de este estudio fue evaluar el efecto de la miel de abeja como antioxidante en la carne cruda de lomo de conejo almacenada en refrigeración a 4 °C. Se evaluó la actividad antioxidante (AA) de tres tipos de miel: oscura, ámbar y clara, para mezclarla con la carne de conejo. Se seleccionó la miel oscura por su mayor efecto antioxidante. Se prepararon 64 muestras de 100 g de carne cruda, 32 se mez-claron con 2 g de miel oscura y las otras 32 se dejaron sin miel (control). Las muestras se almacenaron a 4°C y se evaluó la AA y la concentración de malondialdehído (MDA) a los 0 d, 3 d, 6 d y 9 d de almacenamiento. La AA disminuyó y la concentración de MDA aumentó (P < 0.05) con el tiempo de refrigeración (cambios que indican deterioro de la carne). A los 3 d y 6 d, las muestras de carne cruda con miel exhibieron mayor AA (P < 0.05), y a los 6 d, menores valores de MDA (P < 0.05) comparadas con las muestras control (indicando que no hubo deterioro de la carne). La miel oscura de abeja contiene altas concentraciones de antioxidantes naturales que protegen a la carne cruda molida de lomo de conejo contra el daño oxidativo que puede presentarse durante la refrigeración, por lo que se recomienda su uso para este fin.
La cabra: selección y hábitos de consumo de plantas nativas en agostadero árido
Authors: Zapata-Campos Cecilia Carmela , Mellado-Bosque Miguel Ángel
Published: February 2021

Las cabras habitan regiones áridas como resultado de su adaptación a condiciones extremas. La selección de la dieta es una de las estrategias conductuales que les han permitido evitar deficiencias nutricionales o intoxicaciones aun en condiciones de baja disponibilidad de alimento. Así mismo, el ramoneo, como conducta ingestiva de la especie, les permite seleccionar y obtener plantas con adecuados valores de proteína cruda que favorezcan su desarrollo y supervivencia. También, las cabras se adaptan a las características químicas de las plantas, las cuales desarrollan compuestos bioactivos para evitar ser consumidas. Estos metabolitos secundarios pueden tener efectos antinutricionales y tóxicos así como medicinales o curativos, dependiendo del consumo que tenga el animal. El objetivo de este trabajo fue revisar la selección y hábitos de las cabras en el consumo de plantas nativas, para determinar cómo favorecen la supervivencia y productividad de la especie, bajo las condiciones de adversidad ambiental que caracterizan a las regiones áridas. Dicho conocimiento permitirá establecer estrategias para el manejo adecuado del agostadero y conocer el efecto que los compuestos del metabolismo secundario de las plantas puedan tener en los procesos reproductivos, nutricionales, sanitarios, así como en los productos derivados de la leche o carne de estos animales.
Riqueza de aves en la Reserva de la Biosfera Sierra del Abra Tanchipa en San Luis Potosí, México
Authors: Sahagún-Sánchez Francisco Javier , Espinoza-Guzmán Marco Antonio , Huerta-Martínez Francisco Martín
Published: February 2021

El conocimiento de la biodiversidad en un área natural protegida es fundamental para el desarrollo de acciones para su manejo y conservación. El objetivo del presente trabajo fue determinar los patrones de riqueza, categorías de endemismo, así como el estatus de conservación y vulnerabilidad de las aves en la Reserva de la Biosfera Sierra del Abra Tanchipa, ubicada en el noreste del estado de San Luis Potosí, México. Se incluye la información generada por el programa de monitoreo comunitario de aves y otros esfuerzos de muestreo realizados en el área. Se desarrolló trabajo de campo con base en el método de censado de conteo por puntos, los cuales fueron establecidos a lo largo de transectos en el área de estudio. Se registraron 279 especies de aves pertenecientes a 23 órdenes y 54 familias, correspondiendo el mayor porcentaje a las especies residentes permanentes (64.16 %). Del total de especies reportadas, 37 se encuentran bajo alguna categoría de riesgo y 25 presentan alguna categoría de endemismo. El 54.12 % de las especies tienen afinidad neotropical, 26.88 % neártica y 19 % neártica/neotropical. Por otro lado, alrededor del 22.22 % de las aves registradas tienen un nivel de sensibilidad al disturbio de medio a alto, que puede incrementarse debido a los cambios en los hábitats generados por las actividades humanas en la zona de influencia de la reserva. Los monitores comunitarios aliados al programa contribuyeron significativamente en las actividades de campo y la difusión de las acciones orientadas al conocimiento de las aves en la reserva. Los datos obtenidos permiten actualizar la información en el programa de manejo del área natural protegida de la reserva, lo que favorecerá la conservación de las aves en la zona.
Riqueza vegetal en patios familiares del trópico mexicano: hallazgos desde la teoría de polos de desarrollo
Authors: Cruz-Bautista Patricia , Martínez-Dávila Juan Pablo , Gómez-Hernández Tania , Casanova-Pérez Lorena
Published: February 2021

La riqueza de especies existentes en el patio familiar es el resultado de la coincidencia de procesos sociales, económicos, culturales y ambientales, que suceden más allá de sus límites físicos. Una teoría aún vigente para comprender estos factores externos es la teoría de polos de desarrollo. El objetivo de la presente investigación fue conocer la riqueza de especies vegetales comestibles versus ornamentales en patios familiares de 13 comunidades de Paso de Ovejas, Veracruz y la influencia que tiene en ello el polo de desarrollo más cercano (cabecera municipal). Se aplicó una encuesta consistente en 443 cuestionarios, a través de un muestreo no probabilístico de tipo accidental. En el análisis de los datos se usó estadística descriptiva e inferencial (componentes principales) y los índices de familiaridad (IF), valor de uso (IVU) y consenso del informante (ICF). Los resultados obtenidos sugieren que la riqueza de especies ornamentales versus comestibles está relacionada con la lejanía o cercanía al polo de desarrollo. La influencia de este polo afecta la dinámica socioeconómica familiar, cuyos miembros, si bien evidencian un alto grado de familiaridad con las especies existentes en sus patios familiares, también expresan la generación de condiciones de posibilidad para que parte de ellas (especies comestibles) puedan ser progresivamente abandonadas en su uso y manejo, como sucede en una comunidad de la ruta 3. Se concluye que, en la determinación de la riqueza de especies del patio familiar interviene el polo de desarrollo, como un factor exógeno, el cual trastoca la dinámica familiar en las comunidades que lo circundan. Dicha información se considera relevante para los tomadores de decisiones en el diseño de estrategias de fortalecimiento de este agroecosistema tradicional.
Estrategias de flexibilidad y su relación con el ambiente laboral, la dedicación y el reto intelectual
Authors: Madero-Gómez Sergio , Ortiz-Mendoza Oscar Eliud , Guerra-Leal Eva María
Published: February 2021

Las empresas han integrado estrategias de flexibilidad como parte importante en los procesos de recursos humanos, principalmente como un componente más de su salario emocional. El objetivo de esta investigación fue establecer de qué manera la flexibilidad laboral se relaciona con la dedicación, el reto intelectual y el ambiente laboral que perciben las personas en su lugar de trabajo. Se realizó una investigación de tipo cuantitativo durante el mes de noviembre de 2018, en el que se aplicó un cuestionario en línea de 38 reactivos, obteniendo una muestra de 282 trabajadores mexicanos de la ciudad de Monterrey, Nuevo León, México. El 95.4 % de los entrevistados manifestaron interés por al menos una de las variantes de trabajo flexible. La modalidad de trabajo en espacios abiertos fue la opción menos aceptada, con una preferencia del 7.8 %. Se encontró correlación positiva entre el ambiente laboral y el balance positivo por trabajo flexible. El ambiente laboral también mostró alta correlación positiva con la dedicación y el reto intelectual. Lo anterior resulta de interés en el contexto actual para las estrategias de recursos humanos y el ambiente empresarial.
PRODUKTIVITAS ALAT TANGKAP PADA OPERASI PENANGKAPAN UDANG DI KABUPATEN PANGANDARAN SELAMA TAHUN 2015-2019
Authors: Apriliani Izza Mahdiana , Hamdani Herman , Rizal Achmad
Published: February 2021

Salah satu kabupaten penghasil udang terbesar di Jawa Barat adalah Kabupaten Pangandaran. Besarnya produksi udang di perairan Kabupaten Pangandaran tidak terlepas dari produktivitas alat tangkap yang dioperasikan. Tujuan dari penelitian ini yaitu untuk mengetahui produktivitas alat tangkap penangkap udang di Kabupaten Pangandaran. Riset dilaksanakan bulan Agustus-Oktober 2019. Metode dalam penelitian ini menggunakan metode studi kasus dan data dianalisis secara deskriptif. Hasil penelitian menunjukan bahwa produksi udang mengalami fluktuasi kenaikan, jumlah produksi udang terbesar terjadi pada tahun 2017 yaitu sebesar 965.877,40 kg. Terdapat beberapa alat penangkapan ikan yang dioperasikan untuk menangkap udang di Kabupaten Pangandaran yaitu jaring bernong sebanyak 459 unit, trammel net sebanyak 315 unit, pukat pantai sebanyak 27 unit dan dogol sebanyak 25 unit. Jaring bernong yang dimaksud merupakan alat tangkap bottom gillnet karena menangkap ikan demersal. Nilai produktivitas alat tangkap paling tinggi yaitu alat tangkap dogol sebesar 4,4 kg/trip dan pukat pantai 4,4 kg/trip dan nilai produktivitas terendah yaitu pada alat tangkap trammel net sebesar 1,8 kg/trip dan jaring bernong sebesar 1,4 kg/trip.

Kata kunci: alat tangkap, nelayan, Pangandaran, udang