bluuebunny/crossref_metadata_2025 huggingface dataset:
Photoinduced Oxygen Transfer using Nitroarenes for the Anaerobic Cleavage of Alkenes
Authors: Wise Dan , Gogarnoiu Emma , Vacala Taylor , Paolillo Joshua , Hussain Waseem , Duke Alana , Parasram Marvin
Published: June 2022

Herein we report a visible light promoted method for the anaerobic cleavage of alkenes into carbonyl compounds using nitroarenes as oxygen transfer reagents. This approach serves as a safe and practical alternative to mainstream oxidative cleavage protocols, such as ozonolysis and the Lemieux–Johnson reaction. A wide range of alkenes possessing oxidatively sensitive functionalities underwent anaerobic cleavage to generate carbonyl derivatives with high efficiency and regioselectivity. Mechanistic studies support that the transformation occurs via a solvent-separated ion-pair complex and the nitroarene is the sole photoabsorbing species. Direct photoexcitation of the nitroarenes empowers a radical cycloaddition event with alkenes leading to a 1,3,2-dioxazolidine intermediate, which fragments to give the carbonyl products. A combination of radical clock experiments and in situ PhotoNMR spectroscopy revealed the identities of the key radical species and the putative aryl 1,3,2-dioxazolidine intermediate, respectively.
Phosphazenylphosphonium Frameworks: A Novel Main Group Mitochondrial Delivery Vector with Enhanced Properties
Authors: Ong How Chee , Coimbra João T. S. , Ramos Maria J. , Xing Bengang , Fernandes Pedro A. , Garcia Felipe
Published: June 2022

Mitochondrial targeting represents an attractive strategy for treating metabolic, degenerative and hyperproliferative diseases, since this organelle plays key roles in essential cellular functions. Triphenylphosphonium (TPP+) moieties – the current “gold standard” – have been widely used as mitochondrial targeting vectors for a wide range of molecular cargo. Recently, further optimisation of the TPP+ platform drew considerable interest as a way to enhance mitochondrial therapies. However, although the modification of this system appears promising, the core structure of the TPP+ moiety remains largely unchanged. Thus, in this study, we explored the use of aminophosphonium (PN+) and phosphazenylphosphonium (PPN+) main group frameworks as novel mitochondrial delivery vectors. The PPN+ moiety was found to be a highly promising platform for this purpose, owing to its unique electronic properties and high lipophilicity. This has been demonstrated by the high mitochondrial accumulation of a PPN+-conjugated fluorophore relative to its TPP+-conjugated counterpart, and has been further supported by density functional theory and molecular dynamics calculations, highlighting the PPN+ moiety’s unusual electronic properties. These results demonstrate the potential of novel phosphorus-nitrogen based frameworks as highly effective mitochondrial delivery vectors over traditional TPP+ vectors
Narrativa transmedia: una mirada al conflicto armado y la memoria social indígena desde los relatos expandidos. Casos: Colombia y Perú
Authors: Pinto Arboleda María Cristina , Zapata Cárdenas María Isabel , Gómez Vallejo Luis Eduardo
Published: June 2022

Este trabajo tiene como objetivo central el análisis de dos proyectos transmedia latinoamericanos en el marco de la no ficción, circunscritos desde el método del estudio de casos y la aplicación de elementos de la teoría del actor-red, donde las relaciones, la conformación de grupos sociales que experimentaron realidades, llegan a gestar el valor de agenciamiento, como un enfoque que expande y contribuye a la comprensión y sostenibilidad de la historia y la experiencia en el tiempo del proyecto transmedia. El nivel de impacto en la audiencia de estos dos sistemas narrativos permitió apuntalar sus realidades desde la articulación de acciones de lucha social dentro y fuera de la red, ubicando sus temáticas en agendas políticas y periodísticas locales e internacionales. Impactos que se retoman a la luz de las características de los formatos de la transmedia de no ficción y sus potencialidades cocreativas, con el fin de dinamizar las relaciones sociales y activar la comunicación participativa dentro del ecosistema digital.
La investigación sobre periodismo y Latinoamérica a través de las tesis doctorales defendidas en universidades españolas
Authors: Lozano-Ascencio Carlos , Rodríguez-Díaz Raquel
Published: June 2022

Las tesis doctorales (TD) representan la culminación en la formación de posgrado y también significan el punto de partida en la trayectoria académica de los investigadores júnior. Los estudios de posgrado sobre periodismo permiten realizar investigaciones de amplio calado sobre diferentes elementos marcados por la realidad. La obtención del título de doctor mediante la elaboración de un trabajo de investigación constituye una oportunidad para conocer más a fondo la formación de posgrado en periodismo de las universidades españolas. Los resultados de este trabajo se basan en las tesis defendidas en universidades españolas que contemplan estudios de comunicación con 2784 monografías censadas entre el 2007 y el 2018. Concretamente, esta investigación se centra exclusivamente en las tesis vinculadas al ámbito del periodismo, defendidas entre el 2014 y el 2018, con 506 TD, de las cuales 67 también tienen referencias directas a Latinoamérica. El análisis de los datos evidencia que el periodismo es uno de los temas centrales en el campo de la comunicación; los documentos son las principales unidades de análisis y las técnicas de investigación predominantes se ciñen a los análisis de contenido y de discursos. Metodológicamente, se aprovecha el repositorio de acceso abierto de MapCom (https://mapcom.es/) para analizar la formulación de los objetos de estudio, los enfoques epistemológicos y los métodos de investigación.
Modelo para la definición de los requisitos de un sistema de información en una organización de salud de Mar del Plata, Argentina
Authors: Tabone Luciana Belén , Mortara Verónica Aída
Published: June 2022

El trabajo define los requisitos para el desarrollo de un sistema de información en una organización de salud de Mar del Plata, Argentina. Se combinan las metodologías participativas de investigación operativa soft y el proceso analítico de jerarquías para facilitar la toma de decisiones organizacionales. La propuesta contribuye al desarrollo efectivo y sistémico del proceso decisorio, considerando la infraestructura informacional, características de los decisores y condiciones estructurales y funcionales de la organización.
Comparación de modelos cinéticos isotérmicos durante la adsorción de plomo mediante Azolla caroliniana
Authors: Romero-Bonilla Hugo , Luque Vera Juan Carlos , Castillo Sánchez Andrés , Espinoza Ramón Washington , Olivera Montenegro Luis
Published: June 2022

Los metales pesados constituyen un riesgo para la salud pública de las poblaciones que consumen agua contaminada por estos elementos químicos. En este sentido, el tratamiento de aguas residuales que incorpore la remoción de iones metálicos es causa de múltiples investigaciones a nivel mundial. El objetivo de esta investigación fue determinar la capacidad de remoción del plomo (Pb) presente en aguas sintéticas y la intensidad de adsorción del helecho Azolla caroliniana por este metal. Se utilizó un espectrofotómetro de absorción atómica para determinar la concentración del plomo adsorbido. A partir del gráfico de isotermas de Langmuir se determinó que, para los 4 reactores utilizados, el tipo de sistema isotérmico era desfavorable para esta isoterma (RL’s mayor a 1). Por su parte, las gráficas de las isotermas de Freundlich para los 4 reactores permitieron establecer los modelos lineales del comportamiento cinético de la adsorción de plomo mediante Azolla caroliniana, obteniendo el mejor R2 y la mayor intensidad de adsorción (n) de Pb (0,122) para el reactor D (30 ppm de Pb).
Planeación de las capacidades de producción de una empresa de producción de muebles en Cuba
Authors: Estevez Torres Ailen , Megna Alicio Alexey , Campos Fernández María de los Ángeles , Ramírez Camejo Geinier Barbaro , Jardines Rivas Rafael Eduardo
Published: June 2022

La presente investigación fue realizada en la Unidad Empresarial de Base (UEB) de Muebles Ludema de Las Tunas, Cuba. Tuvo como objetivo la aplicación de un procedimiento para la planeación de las capacidades de producción de muebles para habitaciones de hoteles. Para el desarrollo de la investigación se utilizaron los métodos de observación directa, histórico-lógico, hipotético-deductivo y análisis-síntesis, así como las técnicas de revisión documental y cronometraje a operaciones, además del muestreo por observaciones instantáneas, con el fin de recoger la mayor cantidad de información. Mediante el estudio se observó que la fábrica tiene limitaciones en sus capacidades productivas para enfrentar las demandas existentes, por lo que deberá determinar la capacidad de cada una de las actividades para alcanzar mejores resultados en la producción.
Análisis y desarrollo de la reputación corporativa en las organizaciones modernas. Un acercamiento al estado del arte
Authors: Gómez-Bayona Ledy , Orozco-Toro Jaime Alberto , Restrepo Londoño Edy Zulima , Vélez Bernal Olga
Published: June 2022

El objetivo principal de este estudio bibliográfico es explorar el concepto y la importancia de la reputación corporativa (RC) en los diferentes sectores económicos y conocer la manera cómo ha evolucionado este concepto en la educación. Las instituciones de educación superior (IES) se han visto forzadas a implementar estrategias de marketing que les permitan generar RC e impulsar el desarrollo de la formación superior. Es por ello que la RC se ha convertido en objeto de aplicación y práctica en el mundo educativo y empresarial, para la consecución del reconocimiento y el posicionamiento que permitan la obtención de ventajas competitivas sólidas y duraderas. Por medio de la investigación bibliográfica se explora la RC en organizaciones y universidades. En la actualidad, las organizaciones se preocupan más por construir una RC que se mantenga en el tiempo, lo que permite dirigir las instituciones hacia la innovación y el desarrollo continuo en la educación superior. Lo anterior puede influir en las universidades para que empiecen a adoptar planes estratégicos conducidos a las necesidades de la sociedad, especialmente, en el contexto de la constante evolución global.
COVID-associated cognitive impairments: A review
Authors: Preobrazhenskaya Irina S.
Published: June 2022

The COVID-19 pandemic, caused by the SARS-CoV-2 virus, began in March 2020 and continues to the present. The virus most often affects the respiratory system; to date, there is evidence of possible damage to the heart, skin, kidneys, central nervous system in this disease. In this regard, it is of great interest to study the neurological features of COVID-19, in particular, the development of cognitive disorders or the increase in the severity of already existing cognitive impairments. This review provides the latest data on the relationship of COVID-19 and cognitive impairment, the proposed etiology, pathogenesis and main clinical manifestations of cognitive disorders, and also discusses possible strategies for the treatment of cognitive impairment after suffering COVID-19.
Differential diagnosis of vascular cognitive impairment
Authors: Martynova Olga O. , Zakharov Vladimir V.
Published: June 2022

Background. Vascular cognitive impairment (VCI), аccording to world statistics, is the second most common cause of cognitive impairment after Alzheimer's disease (AD). Differential diagnosis between the two most common nosological forms of cognitive impairment is not always simple and is based on the clinical characteristic, neuropsychological and neuroradiological features of the disease.
Aim. To present a differential diagnosis between VCI and AD using the example of a clinical case of vascular mild cognitive impairment.
Materials and methods. A 68-year-old female patient with mild cognitive impairment underwent a neuropsychological testing: the Mini-mental state exam, Frontal assessment battery, the MoCA-test, the Clock-Drawing Test, the 12 Words test, Verbal Association Technique (literal and categorical), The Trail making test (A and B), The digit symbol substitution test, The Boston naming test (40 images), EXIT-25, Beck Depression Scale, Hospital anxiety and depression scale; neuroimaging magnetic resonance imaging in T1, T2, FLAIR, DWI, SWI sequence.
Results. On the basis of clinical data, the results of neuropsychological testing and neuroimaging, the differential diagnosis with AD, the patient was diagnosed with vascular mild cognitive impairment. Nootropic therapy (choline alfoscerate) was prescribed and recommendations on risk factors correction were given.
Conclusion. The article describes a patient with mild VCI. This case study discusses the main differences between AD and VCI that can be used as a basis for differential diagnosis. The features of cognitive impairments in VCI and AD are described, including the predominance of attention impairment, an executive function disorder in VCI and an impairment of memory progressing according to the Ribots law in AD. Differences in visuospatial skills and language in VCI and AD are discussed. The most reliable neuroradiological signs of cerebrovascular diseases are described.
Ipidacrine efficacy in diabetic polyneuropathy complex treatment: A review
Authors: Zinovyeva Olga E. , Egorov Pavel D. , Penkina Anna I. , Guseinov Samir S.
Published: June 2022

Diabetic polyneuropathy (DPN) is a common neurological complication of diabetes mellitus. The most common DPN type is distal symmetric, predominantly sensory, polyneuropathy (DSPN), often accompanied by pain syndrome. This article is aimed to evaluate of ipidacrine (Ipigrix) efficacy in complex DSPN therapy. The dynamics of clinical and neurophysiological manifestations of DPN in the form of the appearance of previously absent tendon reflexes, a decrease in the area and severity of sensory disturbances, the intensity of neuropathic pain, an increase in the amplitude of motor and sensory responses in response to stimulation of peripheral nerves indicates the activation of reinnervation processes against the background of therapy using ipidacrine. Assessing the positive effect on the restoration of the structure and function of peripheral nerves, good tolerability and safety of ipidacrine (Ipigrix), it is possible to recommend the drug in patients with DSPN.
VDAC1 negatively regulates melanogenesis through the Ca2+-calcineurin-CRTC1-MITF pathway
Authors: Wang Jianli , Gong Juanjuan , Wang Qiaochu , Tang Tieshan , Li Wei
Published: June 2022

Melanocytes produce melanin for protecting DNA from ultraviolet exposure to maintain genomic stability. However, the precise regulation of melanogenesis is not fully understood. VDAC1, which is mainly localized in the outer mitochondrial membrane, functions as a gatekeeper for the entry or exit of Ca2+ between mitochondria and the cytosol and participates in multiple physiological processes. Here, we showed a novel role of VDAC1 in melanogenesis. Depletion of VDAC1 increased pigment content and up-regulated melanogenic genes, TYR, TYRP1, and TYRP2. Knockdown of VDAC1 increased free cytosolic Ca2+ in cultured melanocytes at the resting state, which activated calcineurin through the Ca2+-calmodulin-CaN pathway. The activated CaN dephosphorylated CRTC1 to facilitate its nuclear translocation and ultimately up-regulated the transcription of the master regulator of melanogenesis MITF. Consistently, depletion of Vdac1 in mice led to up-regulation of the transcription of MITF and thereafter its targeted melanogenic genes. These findings suggest that VDAC1 is an important negative regulator of melanogenesis, which expands our knowledge about pigment production and implies its potential role in melanoma.
Depressão e Rendimento Escolar
Authors: Bitencourt da Silva Gabriel , Menezes Munhoz Juliana , Sônego Fabricia , Rohr Angela
Published: June 2022

O transtorno depressivo, especialmente na adolescência, durante o Ensino Médio, compreende períodos marcados pelo surgimento de conflitos pessoais que podem representar um obstáculo no rendimento escolar dos alunos, assim como na dinâmica docente. Essa problemática possivelmente se intensificou durante o período de ensino remoto. O presente trabalho teve como objetivo entender a forma como os professores de Ensino Médio percebem e lidam com os sintomas da depressão em seus alunos e a percepção docente em relação ao transtorno e o rendimento escolar, além de compreender os impactos na saúde mental dos estudantes decorrentes do período de ensino remoto. Para uma melhor compreensão da problemática, foi realizada uma pesquisa bibliográfica e aplicado um questionário, com questões de múltipla escolha e dissertativas, a professores de uma escola da rede estadual do município de Alegrete (RS). Os questionários foram disponibilizados virtualmente, e os dados coletados foram organizados e analisados pelo método da Análise Textual Discursiva. Constatou-se um posicionamento homogêneo por parte dos entrevistados, quanto à questão do rendimento escolar prejudicado em razão da depressão, em relação ao papel do professor perante essas problemáticas e, também, quanto aos impactos causados pela adequação ao ensino remoto. Embora os professores tenham dimensão de sua importância nesse enfrentamento, relataram não se sentirem preparados o suficiente para lidar com essas situações. Concluiu-se que há necessidade de formação continuada a respeito das questões que envolvem saúde mental, para os professores, e a inclusão efetiva de assistência psicológica especializada, para os alunos.
СОВРЕМЕННЫЕ ТЕНДЕНЦИИ И ПРИОРИТЕТЫ РАЗВИТИЯ СИСТЕМЫ ОКАЗАНИЯ СРОЧНОЙ МЕДИЦИНСКОЙ ПОМОЩИ НАСЕЛЕНИЮ РЕСПУБЛИКИ ДАГЕСТАН
Authors: Газимагомедова Патина Казимовна , Билалова Аминат Магомедовна
Published: June 2022

Рассматриваются современное развитие и возможные пути совершенствования оказания медицинской помощи населению Республики Дагестан (РД). Формулируются ключевые задачи по улучшению системы здравоохранения в республике за счет информатизации государственной системы здравоохранения. Выявлены приоритетные направления по созданию единого цифрового контура на основе единой государственной информационной системы в сфере здравоохранения (ЕГИСЗ) РД в современных условиях.
工业废气废水的危害及治理措施研究
Authors: 梦莹 李
Published: June 2022

随着中国经济的持续快速发展，工业化进程的不断加快，环境污染日益严重，国家对环境保护的重视程度也越来越高。工业生产过程中排出的废气废水是环境污染的主要原因，论文针对工业废气、废水的危害及其治理措施进行研究，探讨如何在保障工业发展的前提下开展工业废气、废水的治理。
机场噪声验收监测常见问题及应对措施
Authors: 怡婧 朱
Published: June 2022

在各类建设项目环境验收监测中，机场噪声监测项目偏少，监测经验相对欠缺，测量方法也不够完善，导致在实际噪声监测中测量点位置及测量时间无法准确把握。论文分析研究了机场噪声监测中的常见问题及应对措施，提出合理化解决建议和行之有效的监测方法，有助于顺利开展机场噪声监测工作，减少因机场噪声对人们正常生活的影响。
餐厨垃圾预处理过程产生废气的净化措施
Authors: 春英 薛 , 绍鹏 桑
Published: June 2022

餐厨垃圾是城市生活垃圾的重要组成部分，其成分复杂，极易变质、腐烂、发酵，滋生蚊蝇，产生大量毒素及散发恶臭气体，对外界环境及人体健康产生严重危害。论文结合中国北京某生活垃圾处理厂恶臭气体治理情况，分析恶臭污染物产生的机理、产生环节、主要成分以及恶臭污染物治理采取的措施，并对不同处理工艺进行了比较分析。
土壤环境监测中分析化学的应用思考
Authors: 南盛 林
Published: June 2022

由于中国的经济社会蓬勃发展，空气污染社会问题也日益突出，因此加强环境保护监督管理工作既是中国环境综合治理的主要内容，更是根本内容。分析化学法作为一项常规的环保监测方法，一直以来都获得了普遍的应用并得到了良好的回报。论文将重点探讨分析化学法在环保监察中的实际运用，并期望能给当前环境监测工作提出一点借鉴。
工业VOCs 废气治理技术及应用实践
Authors: 露怡 周
Published: June 2022

工业VOCs废气主要由多种有机体的构成，它具有挥发性和刺激性，能够对于周围的环境和人体带来一定的危害。而这些年来，随着生态环保理念在中国不断推进，对于工业的生产和废气的处理都提出了更高的要求。因此，推进了工业VOCs废气治理技术，包括吸附技术、氧化技术等。开展论文的研究工作，主要了解工业VOCs废气的危害情况以及所使用的几种治理技术，提出几点有效地应用实践，以期为相关技术的普及和革新提供一定帮助。
基于生物修复技术在土壤污染治理中的应用探讨
Authors: 康旭 吴
Published: June 2022

在中国经济得到高速发展的同时，环境污染的问题和其带来的影响却随之不断显化和突出，如水污染、大气污染、土壤污染等，其中土壤污染不仅影响的范围大，影响的持续时间也久，应获得高度重视。粗放经济增长带来的环境破坏导致了中国大面积土地遭受了不同程度上的污染，不仅耕地面积持续缩减，人民的正常居住环境也受到了深远的影响。针对这些现象，国家和社会对土壤污染治理的关注度逐渐提高，有关单位结合当下的环境保护形势正积极制定科学的土壤污染治理政策，并加强综合治理工作力度，同时随着生物修复技术的进一步开发，其在土壤污染防治领域也获得了更加广泛地运用。为了进一步将生物修复技术的理论和目前土壤污染治理情况从实践上结合起来，论文针对生态修复技术在土壤污染治理中的应用展开了详尽的论述与解析。
夏热冬冷地区水源热泵节能环保实例分析——以泾县医院 地下水源热泵空调系统为例
Authors: 绍明 陈
Published: June 2022

水源热泵作为一种可再生能源利用技术，其利用地球表面浅层水所吸收的太阳能和地热能形成的低位能源，仅消耗少量的电力资源就可将低位热能转化为高位热能，具有减少一次能源消耗从而减少温室气体排放的潜力。论文结合泾县医院采用的水源热泵中央空调系统及其运行情况，从实际项目出发，研究水源热泵空调系统的节能特性、经济效益和环境影响，为水源热泵系统的研究提供参考。分析表明，泾县医院所采用的地下水源热泵系统全年常规能源替代量为324542.23kgce，CO2 减排量为801.62t/y，环境保护作用突出，经济效益明显。
刍议碳达峰和碳中和背景下工业低碳发展
Authors: 锋 王 , 振 祁
Published: June 2022

全球经济在飞速发展，碳排放量也一路高飞猛进，生态环境受到严重污染，能源资源也更加短缺。在此背景下，各国提出碳达峰与碳中和理念，倡导发展低碳工业。论文运用文献法、调查法对碳达峰与碳中和的内涵、背景等做简要分析，然后针对碳达峰与碳中和背景下中国工业低碳发展路径展开探究，提出几项观点，以供借鉴参考。
Digital Infographics Design (Static vs Dynamic): Its Effects on Developing Thinking and Cognitive Load Reduction
Authors: Shemy Nader Said
Published: June 2022

The current study investigates the effect of the difference between two styles of infographics (static vs. dynamic) on developing visual thinking and reducing the cognitive load of grade six students in their science course. The researcher relied on the quasi-experimental design. The random sample population included 40 students who were divided into two equal experimental groups: the first group of students was exposed to static infographics, while the second was exposed to dynamic infographics. The experimental treatment of independent variables was done by Wepik and Vyond web applications. Data were collected by two tools, a Visual Thinking Test (prepared by the researcher) and a Cognitive Load Scale (NASA-TLX). The results indicated that there was a significant impact of dynamic infographics on developing students’ visual thinking and reducing their cognitive load compared with static infographics. This can be attributed to the diverse stimuli and multimedia elements that dynamic infographics provide, which are compatible with the students’ tendencies and abilities, as well as their learning, cognitive and perception styles. Furthermore, the presentation of concepts in a sequential and orderly manner can allow for in-depth understanding and assimilation with a limited cognitive load.
Design and construction of the “Chaumény” footbridge in posttensioned UHPFRC
Authors: Géhin Dominique , Brühwiler Eugen , Bertola Numa Joy , Widmer Laurent
Published: June 2022

In 2020/21, the “Chaumény” footbridge was built in posttensioned UHPFRC over a railway line in the city of Montreux, Switzerland. UHPFRC stands for Ultra High Performance Fiber Reinforced Cementitious composite. UHPFRC shows high resistance both in tension and compression as well as excellent durability properties. The design and construction of the lightweight structure is described. The structure consists of a U-shaped trough girder with a span of 22.5m above the railway clearance, resting on one abutment and one pier, as well as a staircase leading from the pier down to the ground. The footbridge is composed of several precast elements that were assembled by posttensioning to achieve monolithically linked structure.
Safety level of longitudinally stiffened plates under biaxial loading considering different launching bearings and eccentricities
Authors: Maier Nadine , Mensinger Martin , Tallushi Enea , Ndogmo Joseph
Published: June 2022

In general, today two types of launching bearings are used in the construction of large steel and steel concrete composite bridges: sliding rockers and systems with hydraulic bearings. During incremental launching, the centre of the webs of the superstructure is not perfectly in line with the centre of the launching bearings due to unavoidable tolerances. These eccentricities are not considered in the current design against plate buckling according to DIN EN 1993-1-5 [2]. Furthermore, there is a significant difference between the different types of launching bearings due to the boundary conditions. At the Technical University Munich, large-scale buckling tests were carried out on longitudinally stiffened plates under biaxial stresses with different types of launching bearings and eccentric load introduction. The test results as well as the results from the validated numerical model demonstrate the influence of different types of launching bearings on the buckling behaviour. The results are compared with the buckling verification according to the reduced stress method proposed in DIN EN 1993-1-5 [2].
Experimental and numerical investigations on the fatigue behavior of high-strength concrete under combined shear-compression loading
Authors: Becks Henrik , Aguilar Mario , Baktheer Abedulgader , Chudoba Rostislav , Claßen Martin
Published: June 2022

A cost-efficient yet safe design of reinforced and prestressed concrete structures under fatigue loading is a highly complex and elaborate task. One of the main reasons for this is the still insufficient understanding of the fatigue damage phenomenology of concrete. A promising hypothesis states that the evolution of fatigue damage in concrete at subcritical load levels is governed by cumulative internal sliding between aggregates. With the objective of collecting experimental results supporting the fundamental postulated hypothesis, a systematic experimental campaign was developed to investigate the fatigue behavior of high-strength concrete under shear-compression loading using newly adapted Punch-Through-Shear-Tests (PTSTs). The test setup is capable of applying a controlled fatigue shear loading with simultaneous constant fatigue compressive loading, without causing secondary cracks. Various phenomena of confined concrete shear fatigue behavior, such as the evolution of confinement during fatigue life and the loading and unloading behavior, are discussed.

Finally, numerical studies reproducing experimental results using a pressure-sensitive fatigue interface model are presented. This material model is able to capture the material degradation due to internal sliding between aggregates, as the fatigue damage evolution is linked to a measure of the cumulative shear strain. Simulations at the single material point level showed that the model can reproduce the evolution of the shear and confining stresses under monotonic loading, as well as its ability to simulate pre- and post-peak cyclic behavior. The material model was used as well in a FEM simulation for modeling the behavior of the PTST. The calculated results show good agreement with experimental tests and allow a more profound investigation of the dissipative mechanisms occurring in the process zone.
Creating digital twins of existing bridges through AI-based methods
Authors: Mafipour M. Saeed , Vilgertshofer Simon , Borrmann André
Published: June 2022

Bridges require regular inspection and maintenance during their service life, which is costly and time-consuming. Digital twins (DT), which incorporate a geometric-semantic model of an existing bridge, can support the operation and maintenance process. The process of creating such DT models can be based on Point cloud data (PCD), created via photogrammetry or laser scanning. However, the semantic segmentation of PCD and parametric modeling is a challenging process, which is nonetheless necessary to support DT modeling. This paper aims to propose a segmentation method that is the basis for a parametric modeling approach to enable the semi-automatic geometric modeling of bridges from PCD. To this end, metaheuristic algorithms, fuzzy C-mean clustering, and signal processing algorithms are used. The results of this paper show that the scan to BIM process of bridges can be automated to a large extent and provide a model that meets the industry’s demand.
Rehabilitation of Earth Retaining Wall for Slope Failure, due to Strength Reduction and Seismic Acceleration, Considering Nonlinear Soil-Structure Interaction
Authors: Hohberg Jörg-Martin
Published: June 2022

The usual design of retaining walls employs triangular earth pressure distributions with coefficients anticipating some compliance in sliding or tilting mode; if very stiff, pressure-at-rest is assumed. If seismic acceleration is to be accounted for, this is mostly done by the formula of Mononobe-Okabe, which is over 100 years old. Recent collapses of angular retaining walls, such as the one of Schönberg at the Brenner Motorway in March 2012, drew particular attention to their vulnerability due to unnoticed corrosion of the bending reinforcement in the cold joint between wall and base slab or a tail skid. Extensive risk analyses by both the Austrian ASFINAG and the Swiss ASTRA were triggered [1][2] as well as research projects at TU Graz and ETHZ Zurich. The following presentation inves- tigates the failure modes of a staggered retaining wall in a steep slope, the stabilizing effects of prestressed ground anchors, and the influence of soil-structure interaction on stress redistribution in the reinforced concrete structure.
Design-driven Uniaxial and Biaxial Tensile Testing of Knitted Fabrics Applied to Construction
Authors: Monticelli Carol , Zanelli Alessandra
Published: June 2022

Knitted fabrics are rarely subjected to tensile stress tests in the field of architectural construction materials, mostly due to their common use as drapery. However, recent non-standard applications of tensioned knitted textiles to hybrid lightweight constructions call for the assessment of their mechanical behavior. In the light of the absence of specific testing methodologies regarding knitted fabrics in the field of construction, this study aims at investigating customized testing techniques that target design requisites, as well as extending previous groundwork on plain weft- knitted textiles to tuck-loop knit structures. Fabrics with a piquet Lacoste loop structure are tested uniaxially and biaxially in order to estimate the feasibility of a relatively large-scale project. The challenging task consists of stretching the limited production width in weft direction to the extended dimensions of the tensile architectural project. Hence the study focuses on elongation limits and especially on the maximum elongation that allows elastic deformation. Extracted empirical data are expressed in the form of stress/strain curves that enable an appropriate understanding of the textiles’ mechanical behavior. This inquiry points out the extent to which knit pattern favors directional elongation in warp as opposed to weft or vice-versa. In addition, it addresses the mechanical performance of knitted textiles by means of a strategic customization of tensile tests that can make them better at informing the design process and feasibility assessment.
Tests of Glass Banister Panels with Embedded Laminated Connections
Authors: Zdražilová Michaela , Sokol Zdeněk , Eliášová Martina
Published: June 2022

Trends in modern architecture are heading towards a complete transparency of structures, which makes glass a very popular building material. However, achieving a completely transparent look of a structure may be problematic mainly due to glass elements connections. The connections must be capable of bearing all stresses performing during the lifetime period and meet high aesthetical standards at the same time. An embedded laminated point connection represents a progressive glass fixing systems. An ongoing research of the Czech Technical University in Prague is focused on the characteristics of this type of connection. Within this research, a set of real-scale laminated banister panels with two sets of embedded point connections was tested. The experiment showed the way of collapse and a short-term resistance of a laminated glass panel with two sets of embedded point connections under vertical loads.
Indirect estimate of concrete compression strength framework with FE model updating and operational modal analysis
Authors: Rosso Marco Martino , Cucuzza Raffaele , Marano Giuseppe Carlo , Aloisio Angelo , Pasca Dag Pasquale
Published: June 2022

The aging of existing concrete structures requires the development of economical and non- destructive (ND) methods to estimate their structural capacity. The practice of operational modal analysis (OMA) in civil structures is actually widespread, but there are a few applications that relate the estimate of the modal parameters to the ultimate resistance of concrete: accurately, the elastic modulus of concrete is a mechanical parameter correlated to the conservation state of concrete. The modal parameters can return reliable estimates of the elastic modulus, by assuming the geometrical characteristics of the beam and the mass density. In this paper, the authors estimate the elastic modulus of a set of seven spans concrete bridge by optimizing the finite element (FE) model of the bridges using the outcomes of OMA. Thereafter, the value of the elastic modulus has been compared with the compressive resistance of concrete obtained by using existing literature formulations and in-situ destructive tests on concrete specimens. It is assessed the reliability in the estimate of the compression resistance of concrete using OMA, by propagating the uncertainties of the estimates from the modal parameters to the resistance of concrete.
A Parametric Study of an old Concrete Trough Bridge using non-linear Finite Element analysis
Authors: Sarmiento Silvia J. , Åkergren David , Gustafsson Jacob , Gonzalez-Libreros Jaime H. , Sas Gabriel , Elfgren Lennart , Coric Ibrahim , Enoksson Ola
Published: June 2022

At least 20% of existing railway bridges in Sweden are reinforced concrete (RC) trough bridge that consist in a slab carried by two longitudinal main beams. As these bridges are getting old, there is an urging need to assess their remaining capacity with the aim of prolonging their service lives. The limited literature on the topic has pointed out that there is a significant difference between the capacity predicted by available codes and that obtained experimentally. In this paper, a review of the Bridge and Tunnel Management database (BaTMan) of railway infrastructure in Sweden, is carried out to gain an overview of the current state of the Swedish railway bridge, with focus on trough bridges. Then, a non-linear finite element model is calibrated using the experimental results of the previous testing of a decommissioned trough bridge. The model is used in a parametric study where the effect of key mechanical parameters on the capacity of trough bridges is studied.
Horizontal bracing in steel I-girder bridges with composite concrete decks
Authors: Vestman Victor , Collin Peter , Lilja Heikki , Tirkkonen Timo , Peltomaa Mikko , Jordán Javier , Berthellemy Jacques , Hällmark Robert
Published: June 2022

This paper treats the use of horizontal trusses between the bottom flanges of new I-girder bridges, to create a box-like behaviour. In contrast to the general vertical cross frames of an I-girder bridge, the horizontal trusses bring along substantial torsional stiffness of the cross section of a bridge. The concept gives large advantages when it comes to fatigue caused by eccentric loading, since the I- girders will share the load more equally. The concept is exemplified by bridges in Finland, Guatemala and France, and some design aspects as well as practical aspects are discussed.
Quantifying the Environmental Impact of Railway Bridges Using Life Cycle Assessment: A Case Study
Authors: Al‐Gburi Majid , Gonzalez‐Libreros Jaime , Sas Gabriel , Nilsson Martin
Published: June 2022

As emission regulations in the EU are becoming stricter, the reduction of greenhouse gas emissions from the construction industry has become a pressing need. As part of the efforts related to this issue, it has been found that Environmental Life Cycle Analysis (LCA) approaches are required to optimize the design, construction, operation, and maintenance of buildings and infrastructure assets. In this paper, The Institution of Structural Engineers guidance on how to calculate the embodied carbon in structures is used as LCA model and evaluated in a case study. The guidance divides the structure´s life cycle into five stages (A1‐A3: Product, A4‐A5: Construction process, B1‐ B7: Use, C1‐C4: End of live and D: Benefits and loads beyond the system boundary) and the environmental impact is measured in terms of carbon dioxide equivalent emissions (kgCo2e) or global warming potential (GWP). The model was applied to an existing reinforced concrete trough bridge, which is a structure type commonly used in Swedish railways. Results show that that the model was effective and simple for investigating the environmental impact of the studied structure.
Improving Writing Skill on Report Text by Using RCG Strategy with PPT for Students of Senior High School
Authors: Ardini Dessy Ayu
Published: June 2022

In this research, the researchers used Responding, Correcting and Guiding (RCG) Strategy with Power Point (PPT) to solve the students’ problems in writing Report Text. The researchers designed the research problem as follows: How can RCG Strategy with PPT improve writing skill on report text for senior high school students? After applying RCG Strategy in cycle I, the students’ average score result in this cycle was 72.5%. This result was still not satisfying. 55.33% or 8 students could not reach the mean score target of 75. Therefore, the research should continue to the next cycle. In cycle II, the students’ average score was 82.33%. There were only 13.33% or 2 students who got bad scores, it meant that the criteria success had been met and this cycle should be discontinued. Based on the findings, the English teachers were recommended to use RCG for enhancing students’ writing skill by applying all the ways in this strategy, they were: Reacting to the Students’ Work, Correcting to the Students’ Work, Responding to the Students Work, Peer Review, Training Students to Self-Edit and Self-Correct and Making Homework Successful.
Case Study: Postruth Construction During The Covid 19 Pandemic
Authors: Subali Edy , Hendrajat Enie
Published: June 2022

This study aims to propose post truth as one of the constructions of transhumanism. To make it easy to understand, the research took case studies in cyberspace related to Covid-19 in Indonesia. Fairclough's critical discourse analysis method is used to analyze post truth on Instagram social media. The results show that post truth as a construction of transhumanism has several arrangements. First, there is a post truth agent, namely the implementing party or subject who does post truth, this shows that the existence of digital technology makes humans have an ambivalent identity. Second, momentum, in this case of the covid pandemic and hot issues (disputes between regional leaders as the time for discourse to appear), momentum is the key that post truth can occur. This shows that technology is used to understand how we co-create human experience. Finally, people who concentrate on digital technology and cyberspace currently operate with the logic of surveillance capitalism, meaning that everything is measured by the number of clicks, engagement, and the duration of the audience watching. We believe that these results have the potential to cause bias in the truth of information to the public, so this study suggests that public authorities should take all the necessary measures to enhance the literacy public to mitigating the negative impacts caused due to the post truth.
Dynamic Plate Load Tests
Authors: Moraes Luciene S. , Cintra José C.A. , Aoki Nelson
Published: June 2022

Dynamic load test is often used for bearing capacity evaluation of driven pile foundation. It is also reported the successful use of this test in bored piles and caissons. This research is mainly concerned with the adaptation, performance and interpretation of the dynamic load test in circular steel plate aiming at the verification of the bearing capacity of shallow foundations. The dynamic increasing energy test (DIET) was used. The tests were performed at the USP/São Carlos experimental foundation site, which soil profile consists of superficial unsaturated, porous and collapsible soil, and for that reason matric suction’s measurements were made, since it has strong influence on the bearing capacity. It could be verified that it is possible to make use of the dynamic load test to plates, associated with analysis methods based on the stress propagation in bars (wave equation), to infer the plate-soil system bearing capacity. Good adjustments were found from dynamic and static load tests performed in a plate tested in this research field. It was also verified that the plate penetration into the soil caused an important increase in the plate-soil system bearing capacity.
Analytical Solution for Luscher’s Problems on Two-Layer Consolidation
Authors: Queiroz Paulo I.B. , Vidal Delma M.
Published: June 2022

In this work, the problem of consolidation of two layers is discussed and analytical solutions for the specific case of Luscher’s problems are developed. Literature suggests that they are the first analytical solutions for problems that cannot be solved by the Gray-Barber closed form solutions for calculation of equivalent thickness. Luscher’s problems are solved using a generalization of the Sturm-Liouville problems for the solution of the partial differential equations. A discussion about the difficulties in generalizing these solutions is also presented. The solution obtained in this work is quantitatively different from that obtained by Luscher via integrated circuits.
Teoría de la Preferencia Revelada para Analizar el Comportamiento del Consumidor de Zapatos de Correr
Authors: Tenorio-Vilaña Anna Fiorella , Mideros-Mora Andrés Iván
Published: June 2022

Uno de los principales problemas de la teoría económica es poder identificar cómo el consumidor construye sus preferencias. Con el fin de generar evidencia empírica sobre la aplicación de la teoría de la preferencia revelada se presenta un análisis descriptivo de las preferencias por zapatos de correr desde la óptica del consumidor, esto con el objetivo de identificar los factores que determinan sus preferencias. Para ello, mediante un muestreo no probabilístico de bola de nieve, se aplicó una encuesta en línea a personas de 18 a 65 años de edad residentes en la ciudad de Quito. Los principales resultados indican que los factores: precio, calidad, estética del zapato (modelo, marca y color), atención de los vendedores y la recomendación de un familiar, amigo o entrenador son considerados como los más importantes al momento de elegir un zapato de correr. Por otro lado, existen ciertas variables como el género, edad, ingreso, personalidad del consumidor y tipo de deportista que alteran las preferencias del consumidor en relación a los de zapatos de correr y que han sido incorporadas en el análisis de la investigación.
Determinant Variables of Logistic Management in Micro and Small Enterprises
Authors: Zúñiga-Igarza Libys Martha , Pérez-Campdesuñer Reyner , De Miguel-Guzmán Margarita , Molina-Molina Mirian Paulina
Published: June 2022

The present research aims to identify the differences and similarities that may exist between the variables associated with the logistics management of business organizations based on their size. For this, a comparison was made between 992 companies in Ecuador, where four types of companies were represented: micro, small, medium and large, in proportion to the structure that the composition of the country’s companies presents. The results showed, by applying a hypothesis test to verify the equality of means, the existence of statistically significant differences in the levels of analysis in variables associated with administrative functions, supply processes, storage, production, distribution and reverse logistics. It was shown that the degree of development of logistics activity is very limited in micro and small companies. Therefore, the body of knowledge and methodological instruments available for business administration must be adapted with caution when applying them in the context of small organizations.
Estudio de Oferta y Demanda para una Asociación de Producción Textil y Costura
Authors: Ludeña-Pérez Angela Fernanda , Serdán-Valencia Kendra Nicole , Romero-Hidalgo Oscar Mauricio
Published: June 2022

En el presente trabajo investigativo se realizó un estudio de mercado de la Asociación de producción textil y costura ‘Lew Asolew’ en la ciudad de Machala, Provincia de El Oro, con el objetivo de analizar la oferta y la demanda. La metodología aplicada fue descriptiva bajo el enfoque cualitativo y cuantitativo, esta consistió en una investigación bibliográfica científica en la que se analizaron las variables del estudio como el comportamiento del consumidor, el sector textil y la aplicación de encuestas para la obtención de la información necesaria por parte de la población seleccionada. Los resultados reflejan el comportamiento del mercado que afecta el funcionamiento de la asociación, predominando lo siguiente: el precio que se establece para cada prenda es acorde a la calidad y al diseño, generándose una influencia en la decisión de compra del cliente. Como conclusión, se identificó que existe exceso de demanda, es decir, se estima que la demanda a futuro sea mayor a la oferta. De tal manera, se determina que existirá una demanda insatisfecha.
Análisis Financiero para la Implementación de un Bus Eléctrico Urbano en la Ciudad de Cuenca
Authors: Torres-Moscoso Diego Francisco , Cordero-Moreno Daniel Guillermo , Tonon-Ordóñez Luis Bernardo , Fernández-Palomeque Efrén Esteban
Published: June 2022

El presente trabajo realizó un análisis financiero que permite establecer la factibilidad económica para implementar buses eléctricos de servicio urbano en la ciudad de Cuenca que circulen por rutas urbanas que conectan las principales sedes universitarias de la ciudad. La ciudad de Cuenta está ubicada a 2 560 msnm y tiene una población urbana 329 928 habitantes. Para ello, se establecieron cinco rutas urbanas que permitan la conexión entre las universidades, proponiendo rutas con longitudes de 14 a 34 km, con una duración de 30 minutos a una hora y quince minutos y considerando la movilización de 40 000 estudiantes. Por un lado, los costos de análisis incluyen ingresos que implica el valor del pasaje y publicidad móvil. Por otro lado, están los egresos como la adquisición de la unidad, el mantenimiento y repuestos, el financiamiento y gastos operacionales. Una vez determinados los valores se aplican condiciones del valor actual neto (VAN) y de la tasa interna de retorno (TIR). Obteniendo como resultado valores menores y negativos, resultando el proyecto no rentable, esto es debido al valor del pasaje de $ 0.31. Como conclusión, y para que el proyecto sea rentable, se considera una elevación del pasaje en un 61 al 83 %.
Estrategia pedagógica orientada a potencializar el aprendizaje del idioma inglés en la Escuela Naval de Suboficiales ARC “Barranquilla”
Authors: De Moya Luis , Candanosa Luis , Gutiérrez Elkin , Quintero-De-Moya Hamudy-Fabian
Published: June 2022

Este artículo es producto de la investigación realizada para diseñar una estrategia pedagógica orientada a potenciar el aprendizaje del idioma inglés, basada en la descripción y análisis de un diagnóstico de las causas del bajo rendimiento académico y perdida de la asignatura de inglés en los grumetes de la Escuela Naval de Suboficiales ARC “Barranquilla”. El propósito fue diseñar una herramienta estratégica que lograra integrar los diferentes recursos educativos que garantizaran un máximo rendimiento académico de los grumetes (alumnos) en el aprendizaje de una lengua extranjera (inglés). El diseño metodológico aplicado fue un modelo de Paradigma cuantitativo experimental, que en esencia tiene un gran desarrollo de orden pre experimental; no obstante, también utiliza elementos no experimentales de corte transversal de tipo descriptivo y correlacional. Entre los principales resultados esperados se destaca la visible aceptación y alta empleabilidad de una estrategia compuesta por recursos selectivos, diseñados teniendo en cuenta las características inherentes en los estudiantes objeto de investigación; condiciones claves para determinar esas variables específicas necesarias para establecer, prospectivamente, un adecuado campo de acción en la aplicación de dicha estrategia pedagógica fundamentada en referentes teóricos afines al objeto de investigación.