Morphometric analysis of the terrain over time to characterize subsidence. Case study: Mexico City, Mexico.

2021 ◽  
Author(s):  
Gabriela Vidal ◽  
Jacob Nieto Butrón ◽  
Mario Alberto Hernández Hernández ◽  
Graciela Herrera Zamarrón ◽  
Enrique Cabral Cano ◽  
...  
Keyword(s):  
Mexico City ◽  
Land Subsidence ◽  
Free Access ◽  
Building Structures ◽  
Commercial Building ◽  
Groundwater Overexploitation ◽  
Changes Over Time ◽  
Over Time

<p>It is well known that groundwater overexploitation can generate land subsidence due to the compaction of compressible aquitards. Mexico City's soils are an important example of highly compressible lake sediments in compaction due to groundwater extraction that have significantly damaged the urban and commercial building structures. Previous studies indicate that there is annual subsidence of 15 to 25 cm in the Mexico City International Airport, 10 cm in downtown, and between 10 to 15 cm in the Southeast Mexico City area. Soil fracturing is an indicator of differential subsidence that has damaged buildings and infrastructure, including hydraulic pipes, sidewalks, and pavements. For this reason, it is necessary to carry out specific studies related to topographic deformation. This talk presents a characterization of the terrain changes over time and a zoning map for Mexico City subsidence susceptibility. To this end, free access elevation models generated from 2000 to 2018 by different sensors and methodologies were compared. The resulting model is validated by mapping information from active GPS stations, whose data is also freely available. Besides, a spatial comparison of land subsidence areas and sites previously identified as flooding and aquifer overexploitation areas is presented. The results will serve as a basis for future monitoring to be carried out in the area with high-resolution tools.</p>

scholarly journals Clinical characterization of dysautonomia in long COVID-19 patients

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nicolas Barizien ◽  
Morgan Le Guen ◽  
Stéphanie Russel ◽  
Pauline Touche ◽  
Florent Huang ◽  
...  
Keyword(s):  
Mixed Models ◽  
Repeated Measures ◽  
Physical Medicine ◽  
Persistent Symptoms ◽  
Index Changes ◽  
Changes Over Time ◽  
And Control ◽  
Testing Group ◽  
Over Time

AbstractIncreasing numbers of COVID-19 patients, continue to experience symptoms months after recovering from mild cases of COVID-19. Amongst these symptoms, several are related to neurological manifestations, including fatigue, anosmia, hypogeusia, headaches and hypoxia. However, the involvement of the autonomic nervous system, expressed by a dysautonomia, which can aggregate all these neurological symptoms has not been prominently reported. Here, we hypothesize that dysautonomia, could occur in secondary COVID-19 infection, also referred to as “long COVID” infection. 39 participants were included from December 2020 to January 2021 for assessment by the Department of physical medicine to enhance their physical capabilities: 12 participants with COVID-19 diagnosis and fatigue, 15 participants with COVID-19 diagnosis without fatigue and 12 control participants without COVID-19 diagnosis and without fatigue. Heart rate variability (HRV) during a change in position is commonly measured to diagnose autonomic dysregulation. In this cohort, to reflect HRV, parasympathetic/sympathetic balance was estimated using the NOL index, a multiparameter artificial intelligence-driven index calculated from extracted physiological signals by the PMD-200 pain monitoring system. Repeated-measures mixed-models testing group effect were performed to analyze NOL index changes over time between groups. A significant NOL index dissociation over time between long COVID-19 participants with fatigue and control participants was observed (p = 0.046). A trend towards significant NOL index dissociation over time was observed between long COVID-19 participants without fatigue and control participants (p = 0.109). No difference over time was observed between the two groups of long COVID-19 participants (p = 0.904). Long COVID-19 participants with fatigue may exhibit a dysautonomia characterized by dysregulation of the HRV, that is reflected by the NOL index measurements, compared to control participants. Dysautonomia may explain the persistent symptoms observed in long COVID-19 patients, such as fatigue and hypoxia. Trial registration: The study was approved by the Foch IRB: IRB00012437 (Approval Number: 20-12-02) on December 16, 2020.

scholarly journals Characterization of earth fissures in South Jiangsu, China

2015 ◽  
Vol 372 ◽  
pp. 249-253 ◽  
Author(s):  
S. Ye ◽  
Y. Wang ◽  
J. Wu ◽  
P. Teatini ◽  
J. Yu ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Earth Fissure ◽  
Aquifer System ◽  
Groundwater Levels ◽  
Earth Fissures ◽  
The Earth ◽  
Cumulative Length ◽  
Differential Land Subsidence

Abstract. The Suzhou-Wuxi-Changzhou (known as "Su-Xi-Chang") area, located in the southern part of Jiangsu Province, China, experienced serious land subsidence caused by overly exploitation of groundwater. The largest cumulative land subsidence has reached 3 m. With the rapid progress of land subsidence since the late 1980s, more than 20 earth fissures developed in Su-Xi-Chang area, although no pre-existing faults have been detected in the surroundings. The mechanisms of earth fissure generation associated with excessive groundwater pumping are: (i) differential land subsidence, (ii) differences in the thickness of the aquifer system, and (iii) bedrock ridges and cliffs at relatively shallow depths. In this study, the Guangming Village Earth Fissures in Wuxi area are selected as a case study to discuss in details the mechanisms of fissure generation. Aquifer exploitation resulted in a drop of groundwater head at a rate of 5–6 m yr−1 in the 1990s, with a cumulative drawdown of 40 m. The first earth fissure at Guangming Village was observed in 1998. The earth fissures, which developed in a zone characterized by a cumulative land subsidence of approximately 800 mm, are located at the flank of a main subsidence bowl with differential subsidence ranging from 0 to 1600 mm in 2001. The maximum differential subsidence rate amounts to 5 mm yr−1 between the two sides of the fissures. The fissure openings range from 30 to 80 mm, with a cumulative length of 1000 m. Depth of bed rock changes from 60 to 140 m across the earth fissure. The causes of earth fissure generation at Guangming Village includes a decrease in groundwater levels, differences in the thickness of aquifer system, shallow depths of bedrock ridges and cliffs, and subsequent differential land subsidence.

scholarly journals Intellectual Capital Change Management in the Construction Industry—The Case of an Inter-Organisational Collaboration

2021 ◽  
Vol 7 (3) ◽  
pp. 199
Author(s):  
José Vale ◽  
Nádia Barbosa ◽  
Rui Bertuzi ◽  
Ana Maria Bandeira ◽  
Vera Teixeira Vale
Keyword(s):  
Construction Industry ◽  
Intellectual Capital ◽  
Competitive Advantages ◽  
Traditional Media ◽  
Intellectual Assets ◽  
Changes Over Time ◽  
The Impact ◽  
Over Time

Nowadays, due to the complexity of the relationships with external entities, along with the importance that traditional media and the innovative social media have in creating competitive advantages, it is necessary for companies to collaborate in order to create Intellectual Capital (IC). Although collaboration is crucial to create IC, there is a paucity in literature regarding the effects that a specific type of collaboration may have on the IC of an organisation, specifically a franchising with a mediatic actor. Moreover, literature addressing IC creation and destruction over time is scarce, especially when applied to the construction industry. This paper’s goal is twofold: understanding the longitudinal changes of a construction SME’s Intellectual Capital, regarding its creation and destruction; analysing the impact that a specific inter-organisational collaboration franchising—with a mediatic actor may have on such IC. A single in-depth case study was conducted, allowing to conclude that the actions of an organisation can develop both Intellectual Assets and Intellectual Liabilities. It was also concluded that inter-organisational collaboration, through a franchise with an actor with experience in communication, can generate, in the long term, positive and innovative effects regarding the different IC components, namely the Relational one. More specifically, the paper allowed to ascertain that an organisation’s IC changes over time in a dynamic fashion, i.e., Intellectual Liabilities which emerged before an innovative collaboration can be transformed into Intellectual Assets and create competitive advantages. This paper contributes to stress the importance of managing IC, not only when it is created, but namely in when it can be destroyed, in a context of inter-organisational collaborations applied to a construction SME.

El sentido de la participación docente en escuelas de tiempo completo. Un estudio de caso

2017 ◽  
Vol 21 (2) ◽  
pp. 49-66
Author(s):  
Abel Pérez Ruiz
Keyword(s):  
Decision Making ◽  
Mexico City ◽  
School Organization ◽  
Training Needs ◽  
Full Time ◽  
Pedagogical Practice ◽  
Toma De Decisiones ◽  
Over Time ◽  
Estudio De Caso

Resumen:El presente artículo tiene como propósito analizar las elaboraciones de sentido que maestros de escuelas de tiempo completo edifican sobre los alcances de su participación educativa dentro de la organización escolar. A partir de un estudio de caso en dos centros de enseñanza básica ubicados en el oriente de la Ciudad de México, se destaca que el involucramiento de los maestros en la toma de decisiones no sigue una ruta clara, certera y definitiva por cuanto los fines educativos, en el marco de las reformas curriculares llevadas actualmente, están cargados de incertidumbre, desaciertos e inconsistencias. Frente a esta circunstancia, los profesores de estas escuelas defienden una práctica pedagógica construida a lo largo del tiempo que sirve como un ideal autoimpuesto para atender las necesidades formativas de las nuevas generaciones.Abstract:This article aims to analyze the elaborations of meaning that teachers within full-time schools build on the achievements of its educational participation within the school organization. From a case study on two basic schools located in eastern Mexico City, it is noted that the involvement of teachers in decision-making does not follow a clear, accurate and definitive route because educational purposes, as part of curricular reforms currently carried, are fraught with uncertainty, mistakes and inconsistencies. Given this circumstance, teachers in these schools advocate a pedagogical practice built over time that serves as a self-imposed ideal for meeting the training needs of new generations.

Intellectual Capital dynamics: seeing them “in practice” through a temporal lens

VINE ◽  
2015 ◽  
Vol 45 (1) ◽  
pp. 46-66 ◽  
Author(s):  
Marco Giuliani
Keyword(s):  
Intellectual Capital ◽  
Value Creation ◽  
Design Methodology ◽  
Participant Observation ◽  
Longitudinal Case Study ◽  
Content Type ◽  
Changes Over Time ◽  
Over Time

Purpose – The purpose of this study is to observe Intellectual Capital (IC) dynamics “in practice” through a temporal lens by considering IC as an on-going process, and thus taking into consideration its life cycle and how it changes over time. Design/methodology/approach – A longitudinal case study has been investigated by adopting a participant observation approach to understand how the dynamics of IC are understood in practice. Findings – This study spotlights three main conceptions of IC dynamics (value creation, IC activities and organizational change) which, although generally proposed in literature as separable concepts, do co-exist and interact, in practice as is reflected in the related managerial tools. Research limitations/implications – The main limitations of this study are twofold. The first is related to the methodology adopted and in particular, to the participant observation approach. The second is related to the specifics of the case study undertaken. This paper contributes to the literature on “Intellectual Capital in action” and “Intellectual Capital in practice” by enriching the understanding of IC dynamics. Originality/value – By comparison to the extant literature in which the IC dynamics concepts are considered separately, this study combines the three different concepts and examines them in vivo, adopting a longitudinal perspective.

F-18 FDG PET/CT Characterization of Talc Pleurodesis-Induced Pleural Changes Over Time

2009 ◽  
Vol 34 (12) ◽  
pp. 886-890 ◽  
Author(s):  
Nghi C. Nguyen ◽  
Isaac Tran ◽  
Christopher N. Hueser ◽  
Dana Oliver ◽  
Hussein R. Farghaly ◽  
...  
Keyword(s):  
Fdg Pet ◽  
Talc Pleurodesis ◽  
Pet Ct ◽  
Fdg Pet Ct ◽  
Changes Over Time ◽  
Over Time

scholarly journals Use of Spectral Indices to Identify the Changes in the Vegetation Community Over Time After Restoring a Palustrine Wetland: A Case Study of Spencer Island Regional Park, Everett, WA.

2019 ◽  
Vol 12 (3) ◽  
pp. 70-80
Author(s):  
Carolina A. Lizana
Keyword(s):  
Spatial Information ◽  
Freshwater Wetlands ◽  
Spectral Indices ◽  
Vegetation Community ◽  
Tidal Freshwater Wetlands ◽  
Successional Stages ◽  
The Difference ◽  
Changes Over Time ◽  
Over Time

Abstract Wetland restoration can be measured over time using community vegetation as an effectiveness indicator of restoration actions. Spencer Island Regional Park is part of the tidal freshwater wetlands along the Snohomish river basin. Those wetlands are part of a complex ecosystems, in which they are included as a salmon corridor. This research analyzes the vegetation community changes over time after restored in 1996 on Spencer Island Regional Park, Everett, Washington State, U.S. I analyzed three spectral indices using segmentation and supervised classification of land cover from 1997 to 2018. I found that in the last 21 years, the areas with emergent palustrine vegetation and forests increased, in contrast to diminishing areas of upland and scrub-shrub classes. Those finds can be interpreted that the community vegetation advanced to higher wetland successional stages as upland areas have been colonized by emergent wetland plant communities. A linear regression model predicted that by 2025, the difference between emergent and upland classes should increase. Empirical evidence is presented that support the integration of spectral indices to identify changes in community vegetation. However, it is recommended for future studies to include spectral indices and spatial information for soil and hydrology to deepen these results.

scholarly journals Managing Productivity in the Infrastructure Sector: A Case Study from Indonesia

2015 ◽  
Vol 61 (3) ◽  
pp. 214
Author(s):  
Eric R. W. Knight ◽  
James D. Meade
Keyword(s):  
Supply And Demand ◽  
Infrastructure Investment ◽  
Demand Side ◽  
Energy Infrastructure ◽  
Multi Level ◽  
Changes Over Time ◽  
Over Time ◽  
New Infrastructure

This paper considers the nature of assessing productivity and effectiveness in infrastructure investment in the context of governments’ increasing investment in new infrastructure. Taking the case of energy infrastructure investment within Indonesia, this paper makes three contributions: (i) develops a model for assessing infrastructure productivity based on landscape, regime and niche-level changes, (ii) suggests the interconnection between these levels based on sequencing multi-level changes over time, and (iii) shows the role of supply and demand side initiatives in enabling new infrastructure investment is evaluated.  AbstrakArtikel ini mempertimbangkan sifat dari penilaian produktivitas dan efektivitas pada investasi infrastruktur dalam rangka peningkatan investasi pemerintah pada infrastruktur baru. Dengan menggunakan kasus investasi infrastruktur energi di Indonesia, artikel ini menghasilkan tiga hal: (i) nembangun model untuk menilai produktivitas infrastruktur berdasarkan perubahan dari lanskap, rezim, dan perubahan di level yang tepat, (ii) menunjukkan interkoneksi antar level-level tersebut berdasarkan perubahan multi-level yang berurutan dari waktu ke waktu, dan (iii) menunjukkan peran dari inisiatif sisi penawaran dan permintaan yang memungkinkan investasi infrastruktur baru untuk dievaluasi.Kata kunci: Infrastruktur; Investasi; Produktivitas; Kerangka Perspektif Multi-Level; InovasiJEL classifications: O25; O33; O38

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