scholarly journals Structural Vulnerability Assessment of Heritage Timber Buildings: A Methodological Proposal

Forests ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 881
Author(s):  
Amirhosein Shabani ◽  
Mahdi Kioumarsi ◽  
Vagelis Plevris ◽  
Haris Stamatopoulos
Keyword(s):  
Construction Material ◽  
Ex Situ ◽  
Structural Vulnerability ◽  
Environmental Threats ◽  
Construction Techniques ◽  
Vulnerability Assessments ◽  
Different Types ◽  
Risk Knowledge

The conservation of heritage structures is pivotal not only due to their cultural or historical importance for nations, but also for understanding their construction techniques as a lesson that can be applied to contemporary structures. Timber is considered to be the oldest organic construction material and is more vulnerable to environmental threats than nonorganic materials such as masonry bricks. In order to assess the structural vulnerability of heritage timber structures subjected to different types of risk, knowledge about their structural systems and configurations, the nature and properties of the materials, and the behavior of the structure when subjected to different risks, is essential for analysts. In order to facilitate the procedure, different assessment methods have been divided into the categories in situ and ex situ, which are applicable for vulnerability assessments at the element and full-scale level of a case study. An existing methodology for structural vulnerability assessments and conservation of heritage timber buildings is reviewed and a new methodology is proposed.

scholarly journals APPLICATION OF COMPUTER SIMULATION TO CONSTRUCTION OF INCREMENTAL LAUNCHING BRIDGES

2007 ◽  
Vol 13 (1) ◽  
pp. 27-36 ◽  
Author(s):  
Mohamed Marzouk ◽  
Hisham Zein El-Dein ◽  
Moheeb El-Said
Keyword(s):  
Simulation Model ◽  
Working Environment ◽  
Bridge Construction ◽  
Actual Case ◽  
Pumping System ◽  
Simulation Engine ◽  
Construction Techniques ◽  
Stationary Location

Construction of bridges is associated with uncertainties that rise due to unavailability of resources, equipment breakdown and/or working environment. Bridge construction techniques can be grouped into six main categories: 1) cast‐in‐situ on false work, 2) cantilever carriage, 3) stepping formwork, 4) launching girder, 5) pre‐cast balanced cantilever, and 6) incremental launching. The latter technique is characterised by minimising the use of falsework. Further, the fabrication and casting of bridge segments are executed at a stationary location, named casting yard (which includes several facilities), deck form, concrete mixing unit, and pumping system. This paper presents a special purpose simulation model to capture the uncertainty associated with bridge construction. The model accounts for the interaction between the different involved resources in construction of bridges using incremental launching technique. The paper describes two methods (single form and multiple forms) of execution used for the segments fabrication. The proposed simulation model utilises STROBOSCOPE as a simulation engine and is coded by Visual Basic 6.0. An actual case study is presented to illustrate the capabilities of the developed model and validate its performance.

scholarly journals Heavy metal phytoremediation: Potential and advancement

2020 ◽  
pp. 81-93
Author(s):  
Pushpa Chaudhary Tomar ◽  
Shilpa Samir Chapadgaonkar ◽  
Varsha Panchal ◽  
Arpita Ghosh
Keyword(s):  
Heavy Metal ◽  
Industrial Waste ◽  
Research Work ◽  
Industrial Effluents ◽  
Ex Situ ◽  
Plant Tissues ◽  
Land Resource ◽  
Environmental Friendly ◽  
Different Types

Industrial activities lead to the release of different types of toxic metals into the environment. Phytoremediation has been established as one of the environmental-friendly and economical processes that have the potential for the remediation of industrial waste. Phytoremediation is used to extract metals from industrial effluents using ex-situ and in-situ treatments. Also, phytoremediation may be used to reclaim the polluted land resource for agricultural purposes. Moreover, this also prevents the bioaccumulation and biomagnification of xenobiotics from farming activities if carried out from polluted land. Phyto-mining can be done to recover and reuse the heavy metals from plant tissues after phytoremediation by plants. This study aimed to give a comprehensive review of recent research work in heavy metal phytoremediation.

scholarly journals The Majella National Park: a case study for the conservation of plant biodiversity in the Italian Apennines

2020 ◽  
Vol 10 ◽  
pp. 1-24
Author(s):  
Valter Di Cecco ◽  
Marco Di Santo ◽  
Michele Di Musciano ◽  
Aurelio Manzi ◽  
Mirella Di Cecco ◽  
...  
Keyword(s):  
National Parks ◽  
National Park ◽  
Central Italy ◽  
Regional Level ◽  
Ex Situ ◽  
Plant Biodiversity ◽  
Massif Central ◽  
Italian Apennines

The Majella National Park (MNP) is a tangible example of the interaction between ex-situ and in-situ conservation of endemic, rare, or endangered species at a Regional level in the context of the Italian national parks. The MNP has the facilities and carries out activities for the conservation of plant biodiversity: it includes botanical gardens, a seed bank, a nursery, and a network of “guardian farmers”, an authentic “granary” in which to protect and conserve biodiversity in and around the Majella massif (central Italy).

scholarly journals Management of local genetic resources by in situ and ex situ methods for research and breeding purpose: the case study of the local animal breeds of Guadeloupe and Martinique

2010 ◽  
Vol 1 (2) ◽  
pp. 395-396
Author(s):  
Michel J. Naves ◽  
Rémy Arquet ◽  
Alain Farant ◽  
Félix X. Quenais ◽  
Jean Luc Gourdine ◽  
...  
Keyword(s):  
Genetic Resources ◽  
Ex Situ

scholarly journals Methodological priorities in assessing wild edible plant knowledge and use – a case study among the Baka in Cameroon

2020 ◽  
Author(s):  
Sandrine Gallois ◽  
Thomas Heger ◽  
Amanda G. Henry ◽  
Tinde van Andel
Keyword(s):  
Ex Situ ◽  
Wild Edible Plant ◽  
Edible Plant ◽  
Single Population ◽  
Plant Knowledge ◽  
Starting Point ◽  
Consumption Frequency ◽  
Short Time

AbstractFreelisting and dietary recalls are frequently used methods in ethnobotany to assess wild edible plant (WEP) knowledge and use. Though these ex-situ interviewing methods are practical to perform and may yield large datasets in a short time, they are known to be limited by the informant’s memory and cognitive bias. Alternatively, the much more laborious walk-in-the-woods method may be used, in which informants point out edible plants in-situ. Few studies, however, examine quantitatively how these different methods influence results. In this study, we assessed how these methods capture the diversity of wild edible plant knowledge and use among the Baka, a group of forager-horticulturalists from southeastern Cameroon. We show that within a single population, and when data on consumption frequency are collected simultaneously, the walk-in-the-woods method results in more detailed information of WEP knowledge and use than do freelisting or dietary recalls. Our in-situ method yielded 91 species of WEP, much more than the ex-situ methods of freelisting (34 spp.) and dietary recalls (12 spp.). Our results imply that previous studies based only on ex situ surveys may have underestimated the importance of WEP for local communities. We propose that future studies on WEP knowledge and use frequency should rely on mixed methods, taking an in-situ method as the starting point of their approach.

scholarly journals Wood and building construction in the Convent of Vilar de Frades (Barcelos, Portugal): the beam systems of the 16th century

2017 ◽  
pp. 87-98
Author(s):  
António Pereira
Keyword(s):  
Present Article ◽  
Construction Material ◽  
Methodological Approach ◽  
Building Construction ◽  
Raw Material ◽  
16Th Century ◽  
Construction Techniques ◽  
Different Types

The monastic and conventual complex of S. Salvador de Vilar de Frades, located in the municipality of Barcelos (Portugal), has an attested occupation since the 11th century. As a result of the different constructive phases, the current edification integrates a diversified group of material and raw material applied according to different construction techniques. Through a methodological approach that favours the intersection between different types of sources, the present article aims to analyse wood as building construction material in Vilar de Frades, namely in the beam systems of the 16th century, as well as in the long-term articulation between liturgical furniture and the edification.

scholarly journals The Reserva de la Biosfera Barranca de Metztitlán (Hidalgo): An illustrated checklist of bromeliads and orchids and their high levels of Mexican endemisms

PhytoKeys ◽  
2019 ◽  
Vol 118 ◽  
pp. 105-123
Author(s):  
Claudia T. Hornung-Leoni ◽  
Yesenia J. Chavarria-Olmedo ◽  
Ivón M. Ramírez-Morillo
Keyword(s):  
Relative Abundance ◽  
New Records ◽  
Ex Situ ◽  
Risk Category ◽  
Herbarium Specimens ◽  
Natural Area ◽  
Mexican State ◽  
Different Types ◽  
Conservation Plan

This study presents a list of species of the two most important families with epiphytic elements, Bromeliaceae and Orchidaceae, from the Reserva de la Biosfera Barranca de Metztitlán (RBBM), the largest Reserve in Hidalgo, Mexico. Thirty-four species are included, 26 corresponding to species in three genera of bromeliads, and eight species in six genera of orchids. The new records represent 26.5% of the total listed in the area; nine of them are new records for the Reserve (RBBM) and one is new for Hidalgo State. This study reveals that endemism for both families is very important in the Reserve (55.88%), since it includes 13 Mexican bromeliads, of which two are endemic to Hidalgo and one to the Reserve, and three orchids, two endemic to Mexico and one to the Reserve. We found species with different types of relative abundance: rare (16) and occasional (7). Additionally, we include information about the category (IUCN, CITES, NOM-059-SEMARNAT) as well as uses reported in the literature for the species in the RBBM. The checklist is strictly based on information obtained from deposited herbarium specimens as well as from those collected during fieldwork. We suggest that a conservation plan (in situ and ex situ) for the RBBM is important and necessary. The predominant habit for both families is epiphytic (17 species); even though there are terrestrial (7) and saxicolous (2), and the remaining are facultative species (8). Nine species are included in some risk category. The present work is the most complete and updated list of Bromeliaceae and Orchidaceae for this important natural area in the Mexican State of Hidalgo. However, more fieldwork is needed to document the biodiversity of the area in general and its flora in particular, as a way to highlight the importance of protected areas in preserving biodiversity.

The surface structure of GaAs(100) studied by RHEED and REM

1990 ◽  
Vol 48 (4) ◽  
pp. 626-627
Author(s):  
Tung Hsu ◽  
G.S. Petrich ◽  
P. I. Cohen
Keyword(s):  
Molecular Beam ◽  
Flux Ratio ◽  
High Energy ◽  
Ex Situ ◽  
High Energy Electron ◽  
Grown Film ◽  
Mbe Growth ◽  
Different Types ◽  
Reflection Electron Microscopy

Three GaAs( 100) samples, each grown on a differently misoriented GaAs( 100) substrate, were prepared using molecular beam epitaxy (MBE) and characterized by in situ reflection high energy electron diffraction (RHEED) and ex situ RHEED and reflection electron microscopy (REM): A: the substrate is 2° off the (100) toward [011] (A misorientation),B: the substrate is 2° off the (100) toward (B misorientation), andC: the substrate is within 0.1° of (100) (Fig. 1).The goals were to compare the effects of MBE growth and oxidation on the different types of steps formed on these surfaces. Understanding the processes involved in promoting ordering of terrace lengths, and reduction of meandering and step bunching is crucial to current attempts to fabricate quantum wire structures.Samples were prepared by chemically etching the substrates and then growing 0.2μm of GaAs at 600°C, at a rate of 0.4μm/h, and using a 3:1 As:Ga flux ratio. Shapes of the in situ RHEED spots were used to measure the step configuration while the oscillation of RHEED intensities was used to determine the thickness of the grown film.

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