scholarly journals Drystone walls in the Algarve, Portugal. Characterization and interconnection with the geology and lithology

2021 ◽  
Vol 1203 (2) ◽  
pp. 022129
Author(s):  
Ada Feroldi ◽  
Elisa da Silva ◽  
Marta Marçal Gonçalves
Keyword(s):  
Small Region ◽  
Raw Material ◽  
Wall Structure ◽  
Natural Material ◽  
Construction Technique ◽  
Rock Fragments ◽  
Rock Types ◽  
Natural Rock ◽  
Geological Diversity ◽  
Object Of Study

Abstract Drystone walls can be frequently observed along the Algarve, south region of Portugal, performing both support and property division. This region is also known by its geological diversity and, consequently, lithology, which are intimately related to the orography. The combination of all these factors allowed the proliferation of this traditional drystone walls during the last centuries, and they represent not only an important element of the landscape, but also a perspective of the social, economic and technical bases of Algarve’s heritage. This article intends to present this diversity and the relationship between its various facets. In order to achieve the objectives, several field surveys were carried out to different geological zones, with the intention of gathering information related to the natural material used and its construction technique, as well as interaction with local inhabitants. These visits were supported by bibliographic and “Web-graphic” research, to substantiate the hypotheses. Based on the data results it is possible to identify a close interconnection between the geology and wall structure typology, since they are made with the natural rock fragments (raw material) found nearby. However, its function is more related to the orogeny and lithology, the latter defining also the type of agricultural culture. The study is enriched by the enormous diversity of rock types, although the Algarve is a relatively small region. The main limitations found during the development of the study are related to the physical access to the walls and the interviews with the locals. These constrictions were due to the lack of land maintenance, allowing vegetation to growth naturally, invading and covering the walls, and also due to the pandemic situation brought by the COVID-19 virus, which interdict the interaction between persons and also the travels. Despite the restrictions mentioned, the fieldtrips gave enough data to support the correlation between the geology, lithology and the raw material used on the drystone walls, as well as their relation to the terraces that proliferate in specific areas of Algarve. In view of the scarcity of bibliographic elements associated with this subject, in the studied territory, the elaboration of documents that allow the identification, characterization, geo-location and dissemination of the object of study, is considered as an asset for this theme. Finally, the study aims to alert and counter the tendency to abandon this type of heritage, valuing it and making it known.

scholarly journals Development of a Modular Home Construction Kit using the Rammed Earth Building Technique

2015 ◽  
Vol 10 (1) ◽  
pp. 24-37
Author(s):  
Valmiki K Sooklal
Keyword(s):  
Service Learning ◽  
Building Materials ◽  
Electrical Power ◽  
Raw Material ◽  
Natural Soil ◽  
Rammed Earth ◽  
Learning Program ◽  
Construction Technique ◽  
Home Construction ◽  
Construction Kit

In developing countries where resources are limited, the task of providing shelter for poverty stricken communities that are already in dire need of basic amenities can be a daunting one. This paper proposes a solution to this housing issue in the form of a modular home construction kit. These kits will provide such communities with a tool for sustainably constructing their own dwellings using local manpower combined with the natural resources available on site. The technique is based on the rammed earth principle in which the raw material for the construction process is primarily the natural soil present at the targeted location. This result in considerable savings in terms of sourcing and transporting costs of building materials typically used in traditional constructions methods. In addition, heavy or powered equipment is not needed for this construction technique making it a viable option for places where an electrical power supply or fuel source is not available.The project is part of a service-learning program, recently introduced at the University of Colorado at Colorado Springs to afford students an opportunity to work on a multidisciplinary team while using their engineering knowledge to provide solutions to real world problems. The student team working on the project has been involved in developing all the necessary procedures for assessment of the location’s soil type as well as the design and sourcing of the kit components. They will also be required to develop the necessary instructional and training material to allow for assembly of the kit components and the implementation of the technique to produce a finished structure (excluding the roof).

Petrography

2016 ◽  
pp. 232-265 ◽  
Author(s):  
Patrick Degryse ◽  
Dennis Braekmans
Keyword(s):  
Raw Materials ◽  
Raw Material ◽  
Rock Fragments ◽  
Historical Materials ◽  
Fabric Analysis ◽  
Trade And Exchange ◽  
Indispensable Tool ◽  
Materials Used ◽  
Ceramic Petrography ◽  
Material Provenance

Petrography has developed into an indispensable tool for ceramic fabric analysis, specifically studying the mineralogical and textural composition of ceramic objects. Petrography is a technique commonly used in geology to describe and classify rocks. Ceramic petrography studies clay-based archaeological or historical materials. Using a polarizing light microscope (PLM) in ceramic studies, the different raw materials used to make a ceramic object can be identified, ranging from clays and other minerals to rock fragments and inorganic or organic temper. The technique moreover feeds into the study of raw material provenance and origin, and is able to discern the different technological procedures followed to make the ceramic object (from shaping to firing), next to providing clues on the function of the object. This information not only helps reconstruct trade and exchange of raw materials and ceramics, but aids in reconstructing society behind the pot.

scholarly journals Nanocelluloses: Natural-Based Materials for Fiber-Reinforced Cement Composites. A Critical Review

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 518 ◽  
Author(s):  
Ana Balea ◽  
Elena Fuente ◽  
Angeles Blanco ◽  
Carlos Negro
Keyword(s):  
Raw Material ◽  
Modulus Of Rupture ◽  
Cement Matrix ◽  
Future Research ◽  
Cementitious Composites ◽  
Natural Material ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Industrial Sectors ◽  
Reinforced Cement

Nanocelluloses (NCs) are bio-based nano-structurated products that open up new solutions for natural material sciences. Although a high number of papers have described their production, properties, and potential applications in multiple industrial sectors, no review to date has focused on their possible use in cementitious composites, which is the aim of this review. It describes how they could be applied in the manufacturing process as a raw material or an additive. NCs improve mechanical properties (internal bonding strength, modulus of elasticity (MOE), and modulus of rupture (MOR)), alter the rheology of the cement paste, and affect the physical properties of cements/cementitious composites. Additionally, the interactions between NCs and the other components of the fiber cement matrix are analyzed. The final result depends on many factors, such as the NC type, the dosage addition mode, the dispersion, the matrix type, and the curing process. However, all of these factors have not been studied in full so far. This review has also identified a number of unexplored areas of great potential for future research in relation to NC applications for fiber-reinforced cement composites, which will include their use as a surface treatment agent, an anionic flocculant, or an additive for wastewater treatment. Although NCs remain expensive, the market perspective is very promising.

Liquid immiscibility and the origin of alkali-poor carbonatites

1988 ◽  
Vol 52 (364) ◽  
pp. 43-55 ◽  
Author(s):  
B. A. Kjarsgaard ◽  
D. L. Hamilton
Keyword(s):  
Liquid Immiscibility ◽  
Raw Material ◽  
Coarse Grained ◽  
Rock Types ◽  
Liquid Fractionation ◽  
Ring Complexes ◽  
The Common ◽  
Melt Cooling ◽  
Carbonate Melt ◽  
Common Sequence

AbstractThe work on liquid immiscibility in carbonate-silicate systems of Freestone and Hamilton (1980) has been extended to include alkali-poor and alkali-free compositions. Immiscibility is shown to occur on the joins albite-calcite and anorthite-calcite at 5 kbar. These results make it possible to interpret ocellar structure between calcite-rich spheroids in lamproite or kimberlite host rock as products of liquid immiscibility. The common sequence of rock types found in carbonatite complexes of melilitite-ijolite-urtite-phonolite is interpreted as being the result of both fractional crystallization and liquid fractionation, the corresponding carbonatite composition changing from nearly pure CaCO3 (±MgCO3) progressively to natrocarbonate. A carbonate melt cooling in isolation will suffer crystal fractionation, the residual liquid producing the rarer ferrocarbonatites, etc., whilst the crystal accumulate of calcite (dolomite) plus other phases such as magnetite, apatite, baryte, pyrochlore, etc., are the raw material for the coarse-grained intrusive carbonatites commonly found in ring complexes.

scholarly journals RAW MATERIAL INVENTORY PLANNING OF PATIENT MENU USING MATERIAL REQUIREMENT PLANNING (MRP) IN RSIA KENDANGSARI MERR SURABAYA

2021 ◽  
Vol 31 (1) ◽  
pp. 14
Author(s):  
Dewi Sri
Keyword(s):  
Raw Materials ◽  
Moving Average ◽  
Exponential Smoothing ◽  
Raw Material ◽  
Production Schedule ◽  
Purchase Order ◽  
Material Requirement Planning ◽  
Material Requirement ◽  
Master Production Schedule ◽  
Object Of Study

Introduction: Material Requirement Planning (MRP) is a technique or a logical procedure to translate the Master Production Schedule (MPS) of the finished goods or end item into the net requirements for some of the components needed to implement the MPS. MRP is used to determine the amount of material needs to support the Master Production Schedule and when the material needs to be scheduled.Methods: The study is conducted on 13 August 2018 until 12 September 2018 at the installation Nutrition RSIA Kendangsari Merr Surabaya. Collecting data in this study using several methods, including: observation- This stage is conducted in all parts related to the object of study, starting from the Purchase Order (PO) by a head cook up to raw material stored in the storage, discussion- author interviews and collects data to communicate and discuss with the respondents. Respondents in this study are the head of the nutrition unit and head cook of RSIA who have the authority doing the purchasing.Results: Planning of procurement of raw materials to the menu rawon in RSIA can use the Exponential Smoothing method. The discussion has compared two methods of forecasting and the results are consistent with the demand’s patterns of Simple Moving Average method, Exponential Smothing. Forecasting has the lowest error rate by using Exponential Smoothing. The second conclusion is a technique of determining the appropriate Material Requirement Planning in raw material procurement to menu rawon in RSIA is using Lot for Lot.

scholarly journals KULINTANGAN: A STUDY OF PRODUCTION PROCESS

2019 ◽  
pp. 80-89
Author(s):  
Adsone Matthew Mitty Gabu Gabu
Keyword(s):  
Production Process ◽  
Musical Instrument ◽  
Musical Instruments ◽  
Raw Material ◽  
Natural Material ◽  
Intangible Cultural Heritage ◽  
Traditional System ◽  
Wooden Frame ◽  
Documented Information ◽  
Selection Of

The main purpose of this study is to document the production process of Kulintangan. Data collection was conducted through interviews and observations. The Kulintangan, an idiophone categorized musical instrument is a set of small kettle gongs positioned straight in a single row on two cords in a small wooden frame. There is no traditional system to notate the Kulintangan as music is passed down by tradition from generation to generation. Distinctions are found in different combinations of instruments, varying dance, tempos, tunings, and production process. While other musical instruments in Sabah are made from a natural material, the Kulintangan is made from either zinc or bronze. The process of producing Kulintangan is a highly skilled process, handed down through generation. Five tools are used to produce a set of Kulintangan. There are 6 processes in the production of the Kulintangan, from the selection of raw material to the final product. Documenting the production process provides documented information and demonstration of the Kulintangan. Thus, revive and continues intangible cultural heritage for the future.

scholarly journals Plato’s cube and the natural geometry of fragmentation

2020 ◽  
Vol 117 (31) ◽  
pp. 18178-18185
Author(s):  
Gábor Domokos ◽  
Douglas J. Jerolmack ◽  
Ferenc Kun ◽  
János Török
Keyword(s):  
Building Blocks ◽  
Pattern Generator ◽  
Three Dimensions ◽  
Tectonic Plates ◽  
Rock Fragments ◽  
Natural Rock ◽  
Natural Geometry ◽  
Average Shape ◽  
2D And 3D ◽  
Universal Pattern

Plato envisioned Earth’s building blocks as cubes, a shape rarely found in nature. The solar system is littered, however, with distorted polyhedra—shards of rock and ice produced by ubiquitous fragmentation. We apply the theory of convex mosaics to show that the average geometry of natural two-dimensional (2D) fragments, from mud cracks to Earth’s tectonic plates, has two attractors: “Platonic” quadrangles and “Voronoi” hexagons. In three dimensions (3D), the Platonic attractor is dominant: Remarkably, the average shape of natural rock fragments is cuboid. When viewed through the lens of convex mosaics, natural fragments are indeed geometric shadows of Plato’s forms. Simulations show that generic binary breakup drives all mosaics toward the Platonic attractor, explaining the ubiquity of cuboid averages. Deviations from binary fracture produce more exotic patterns that are genetically linked to the formative stress field. We compute the universal pattern generator establishing this link, for 2D and 3D fragmentation.

scholarly journals Teoría, metodología y práctica de la producción de posiciones discursivas. (Un ejemplo: El caso de los discursos de la infancia sobre el mundo adulto)

2019 ◽  
Author(s):  
Manuel Montañés Serrano ◽  
Siu Lay-Lisboa
Keyword(s):  
Social Representations ◽  
Adult Population ◽  
Relational Structure ◽  
Raw Material ◽  
Its Analysis ◽  
The Social ◽  
Object Of Study

En este artículo se expone una propuesta con la que producir materia prima discursiva, así como su análisis con el que dar cuenta de las posiciones discursivas que se articulan entre sí, las cuales configuran una estructura relacional y no un mero repertorio de testimonios u opiniones sobre la problemática objeto de estudio. A tal fin, se presenta tanto los aspectos teórico-conceptuales como los metodológico-tecnológicos, y asimismo, con el propósito de ejemplificar la propuesta, se ofrecen algunos contenidos de una investigación cuya finalidad era mostrar las posiciones discursivas sobre las representaciones sociales que la infancia tiene de la población adulta.This article lays out a proposal with which to produce discursive raw material, as well as its analysis with which to account for the articulated discursive positions, which form a relational structure and not a mere repertoire of testimonies or opinions on the problem that is object of study. For this purpose, the theoretical-conceptual in addition to the methodological-technological aspects are presented, along with, with the purpose of exemplifying the proposal, some contents of a research are offered to show the discursive positions on the social representations that childhood has of the adult population.

scholarly journals REE Minerals as Geochemical Proxies of Late-Tertiary Alkalic Silicate ± Carbonatite Intrusions Beneath Carpathian Back-Arc Basin

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 369
Author(s):  
Vratislav Hurai ◽  
Monika Huraiová ◽  
Patrik Konečný
Keyword(s):  
Basaltic Magma ◽  
Accessory Mineral ◽  
Rock Fragments ◽  
Rock Types ◽  
Volcanic Reservoir ◽  
Late Tertiary ◽  
Volcanic Ejecta ◽  
Intermediate Rock ◽  
Magmatic Reservoir ◽  
Back Arc

The accessory mineral assemblage (AMA) of igneous cumulate xenoliths in volcanoclastic deposits and lava flows in the Carpathian back-arc basin testifies to the composition of intrusive complexes sampled by Upper Miocene-Pliocene basalt volcanoes. The magmatic reservoir beneath Pinciná maar is composed of gabbro, moderately alkalic to alkali-calcic syenite, and calcic orthopyroxene granite (pincinite). The intrusive complex beneath the wider area around Fiľakovo and Hajnáčka maars contains mafic cumulates, alkalic syenite, carbonatite, and calc-alkalic granite. Both reservoirs originated during the basaltic magma underplating, differentiation, and interaction with the surrounding mantle and crust. The AMA of syenites is characterized by yttrialite-Y, britholite-Y, britholite-Ce, chevkinite-Ce, monazite-Ce, and rhabdophane(?). Baddeleyite and REE-zirconolite are typical of alkalic syenite associated with carbonatite. Pyrochlore, columbite-Mn, and Ca-niobates occur in calc-alkalic granites with strong peralkalic affinity. Nb-rutile, niobian ilmenite, and fergusonite-Y are crystallized from mildly alkalic syenite and calc-alkalic granite. Zircons with increased Hf/Zr and Th/U ratios occur in all felsic-to-intermediate rock-types. If rock fragments are absent in the volcanic ejecta, the composition of the sub-volcanic reservoir can be reconstructed from the specific AMA and zircon xenocrysts–xenolith relics disintegrated during the basaltic magma fragmentation and explosion.

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