scholarly journals Innovation and development of self-sustained wooden residues blocks "Madeblock" for homes and buildings

2020 ◽  
pp. 29-35
Author(s):  
Martha Lilia Delgado-Martínez ◽  
Mario Abelardo Aguirre-Orozco ◽  
Olivia Márquez-Monárrez / ◽  
Raúl Eduardo Ochoa-Terrazas
Keyword(s):  
Social Enterprise ◽  
Field Research ◽  
Mechanical Resistance ◽  
Huge Amount ◽  
Testing Laboratory ◽  
South Central ◽  
Different Types ◽  
Total Damage ◽  
Partial Damage ◽  
Resistance Tests

The south-central region of Chihuahua State has 150 transformation industries of timber forest resources, these industries dedicate to produce different types of timber furniture, which generates a huge amount of organic scraps that are deposited mostly in the intermunicipal landfill that covers 5 municipalities. Within the field research, it was detected that only one of all companies produces 20 tons of scrap per week. Hence, it is considered ground-breaking developing a model to produce sawdust blocks destined to build sustainable houses and buildings. In order to frame this research, it was also analyzed the problem of September 19th, 2017 earthquakes, presented in the following states of the Mexican Republic, Oaxaca, Chiapas, Puebla, Morelos and Mexico City, where 111,668 houses and buildings had a partial damage and 60,302 had a total damage, in other words, there were 171,990 affected houses and buildings. The prototype’s construction was developed by performing destructives and mechanical resistance tests, inside the testing laboratory of a social enterprise, La Cosa in Delicias City, a town of Chihuahua State, which is accredited by the EMA (Entidad Mexicana de Acreditación).

scholarly journals Polyelectrolyte Gels Formed by Filamentous Biopolymers: Dependence of Crosslinking Efficiency on the Chemical Softness of Divalent Cations

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 41
Author(s):  
Katrina Cruz ◽  
Yu-Hsiu Wang ◽  
Shaina A. Oake ◽  
Paul A. Janmey
Keyword(s):  
Alkaline Earth ◽  
Divalent Cations ◽  
Transition Metal Ions ◽  
Atomic Weight ◽  
Mechanical Resistance ◽  
Flexible Polymers ◽  
Interpenetrating Networks ◽  
Charge Densities ◽  
Polyelectrolyte Gels ◽  
Different Types

Filamentous anionic polyelectrolytes are common in biological materials. Some examples are the cytoskeletal filaments that assemble into networks and bundled structures to give the cell mechanical resistance and that act as surfaces on which enzymes and other molecules can dock. Some viruses, especially bacteriophages are also long thin polyelectrolytes, and their bending stiffness is similar to those of the intermediate filament class of cytoskeletal polymers. These relatively stiff, thin, and long polyelectrolytes have charge densities similar to those of more flexible polyelectrolytes such as DNA, hyaluronic acid, and polyacrylates, and they can form interpenetrating networks and viscoelastic gels at volume fractions far below those at which more flexible polymers form hydrogels. In this report, we examine how different types of divalent and multivalent counterions interact with two biochemically different but physically similar filamentous polyelectrolytes: Pf1 virus and vimentin intermediate filaments (VIF). Different divalent cations aggregate both polyelectrolytes similarly, but transition metal ions are more efficient than alkaline earth ions and their efficiency increases with increasing atomic weight. Comparison of these two different types of polyelectrolyte filaments enables identification of general effects of counterions with polyelectrolytes and can identify cases where the interaction of the counterions and the filaments exhibits stronger and more specific interactions than those of counterion condensation.

COEVALNESS OF INSECT TRACE FOSSILS AND TRACE-BEARING ROCKS, A CASE STUDY FROM THE PLIO?-PLEISTOCENE OF SW SPAIN

Palaios ◽  
2021 ◽  
Vol 36 (3) ◽  
pp. 115-121
Author(s):  
EDUARDO MAYORAL ◽  
JORGE F. GENISE ◽  
FRANCISCO J. RODRÍGUEZ-TOVAR ◽  
ANA SANTOS
Keyword(s):  
Fossil Record ◽  
Field Research ◽  
Sw Spain ◽  
Modern Age ◽  
Different Types ◽  
The Matrix ◽  
Time Gap

ABSTRACT Plio?-Pleistocene outcrops located at the southwestern edge of the Guadalquivir Basin in the area of Lepe (Huelva, Spain) provide an interesting example for studying the contemporaneity of traces with the rocks that contain them. Two different types of cells compatible with the ichnogenera Celliforma (Type 1) and Palmiraichnus (Type 2) were found in these outcrops. Their walls were constructed with the same material as the matrix and our first research in the area showed no extant bees producing them suggesting that they were coeval with the trace-bearing rocks. The case of the “Palmiraichnus-like” Type 2 cells was misleading because of its similarity with Palmiraichnus described from the region in the Canary Islands and Balearic Archipelago (Spain). Two determining features were vital in clarifying this first appearance. In the Palmiraichnus-like cells we found remains of a larval cocoon in one cell that could be dated by C14, giving a modern age. In the Celliforma-like cells more field research in the area allow us to observe extant bees nesting in these rocks in autumn. Ichnological literature show a few cases of asynchronies involving extant traces found mostly in Paleozoic and Mesozoic rocks. In contrast, the case presented herein indicates the time gap between the bearing rocks and the Lepe traces was shorter (ca. 12 ky–2.6 My), enhancing the similarity of traces and rocks and thus their potential coevalness. This case may serve as a warning about other potential examples in the fossil record in which relatively short asynchronies between traces and paleosols exist.

Responses of the Norwegian alpine Betula nana community to nitrogen fertilization

1997 ◽  
Vol 75 (1) ◽  
pp. 108-120 ◽  
Author(s):  
Jaanus Paal ◽  
Eli Fremstad ◽  
Tõnu Möls
Keyword(s):  
Nitrogen Fertilization ◽  
Nitrogen Supply ◽  
Alpine Tundra ◽  
Soil Parameters ◽  
Alpine Plant ◽  
Betula Nana ◽  
South Central ◽  
Different Types ◽  
Tissue Nitrogen ◽  
Annual Deposition

The effect of nitrogen fertilization on species cover, increment of shrubs, tissue nitrogen, and soil parameters was tested during a 3-year experiment in a low alpine plant community dominated by Betula nana in the Dovre mountains, south-central Norway. The doses used were 1.2 and 6.1 g N/m2, corresponding to 0.72 and 3.6 times, respectively, the annual deposition of nitrogen in southwest Norway. Statistical analysis using SAS ANOVA and GLM procedures were applied to different types of models. The cover of species and growth forms showed no significant response to additional nitrogen supply. The increment of shrubs was not significantly affected by the fertilization, except for the year factor. Incorporation of nitrogen into plant tissue was not evident. No effects were found on soil parameters. Key words: fertilization, alpine tundra, shrubs, nitrogen.

scholarly journals 3D reconstruction of syn-tectonic strata in a salt-related orogen: learnings from the Llert syncline (South-central Pyrenees)

2020 ◽  
Vol 18 ◽  
pp. 1-19
Author(s):  
Adrià Ramos ◽  
Berta Lopez-Mir ◽  
Elisabeth P. Wilson ◽  
Pablo Granado ◽  
Josep Anton Muñoz
Keyword(s):  
3D Reconstruction ◽  
Field Research ◽  
Rift System ◽  
Passive Margins ◽  
Fold System ◽  
The North ◽  
Structural Framework ◽  
South Central ◽  
Insight Into ◽  
Central Pyrenees

The Llert syncline is located in the South-central Pyrenees, between the eastern termination of the EW-trending Cotiella Basin and the north-western limb of the NS-trending Turbón-Serrado fold system. The Cotiella Basin is an inverted upper Coniacian-lower Santonian salt-floored post-rift extensional basin developed along the northern Iberian rift system. The Turbón-Serrado fold system consists of upper Santonian – Maastrichtian contractional salt-cored anticlines developed along an inverted transfer zone of the Pyrenean rift system. Based on field research, this paper presents a 3D reconstruction of the Llert syncline in order to further constrain the transition between these oblique salt-related structures. Our results suggest that the evolution of the Llert syncline was mainly controlled by tectonic shortening related to the tectonic inversion of the Cotiella Basin synchronously to the growth of the Turbón-Serrado detachment anticline, and by the pre-compressional structural framework of the Pyrenean rift system. Our contribution provides new insight into the geometric and kinematic relationships of structures developed during the inversion of passive margins involving salt.

scholarly journals A Survey on Analysis of Twitter Opinion Mining Using Sentiment Analysis

2019 ◽  
pp. 537-542
Author(s):  
Vishnu VardanReddy ◽  
Mahesh Maila ◽  
Sai Sri Raghava ◽  
Yashwanth Avvaru ◽  
Sri. V. Koteswarao
Keyword(s):  
Social Networking ◽  
Sentiment Analysis ◽  
Social Networking Sites ◽  
Opinion Mining ◽  
Online Communication ◽  
Valuable Insight ◽  
Huge Amount ◽  
Twitter Data ◽  
Product Service ◽  
Different Types

In recent years, there is a rapid growth in online communication. There are many social networking sites and related mobile applications, and some more are still emerging. Huge amount of data is generated by these sites everyday and this data can be used as a source for various analysis purposes. Twitter is one of the most popular networking sites with millions of users. There are users with different views and varieties of reviews in the form of tweets are generated by them. Nowadays Opinion Mining has become an emerging topic of research due to lot of opinionated data available on Blogs & social networking sites. Tracking different types of opinions & summarizing them can provide valuable insight to different types of opinions to users who use Social networking sites to get reviews about any product, service or any topic. Analysis of opinions & its classification on the basis of polarity (positive, negative, neutral) is a challenging task. Lot of work has been done on sentiment analysis of twitter data and lot needs to be done. In this paper we discuss the levels, approaches of sentiment analysis, sentiment analysis of twitter data, existing tools available for sentiment analysis and the steps involved for same. Two approaches are discussed with an example which works on machine learning and lexicon based respectively.

Anatomy of Counter-Jihad

2019 ◽  
pp. 379-388
Author(s):  
Stig Jarle Hansen ◽  
Linnéa Gelot
Keyword(s):  
Federal Government ◽  
Field Research ◽  
African Union ◽  
Religious Leaders ◽  
Considerable Influence ◽  
Violent Extremism ◽  
Different Types ◽  
Inclusive Approach ◽  
Territorial Control

This chapter considers how Al-Shabaab messaging can be best countered, drawing on field research in Mogadishu and Baidoa, focusing on the area of Bay/Bakool. It shows that lack of security, opportunity, and justice, combined with clan conflicts create conditions that Al-Shabaab can exploit. In Bay/Bakool, the group is seen as having semi-territorial control; in other words, a fairly regular presence despite intermittent deployments or patrols by forces of the Federal Government of Somalia and African Union Mission in Somalia. Thus, the involvement of sheikhs and clan elders is all the more important as they wield considerable influence in communities and can strengthen efforts of countering violent extremism (CVE). A wide, inclusive approach is recommended, drawing upon a combination of different types of religious leaders, in which Sufi, Shafi'i, and Quietist/non-political Wahhabism are represented.

scholarly journals The Influence of Forest Resting Environments on Stress Using Virtual Reality

2019 ◽  
Vol 16 (18) ◽  
pp. 3263 ◽  
Author(s):  
Xiaobo Wang ◽  
Yaxing Shi ◽  
Bo Zhang ◽  
Yencheng Chiang
Keyword(s):  
Virtual Reality ◽  
Field Research ◽  
Stress Relief ◽  
Forest Environment ◽  
Psychological Indicators ◽  
Different Types ◽  
Post Test ◽  
Therapy Services ◽  
Environment Type ◽  
Positive Effect

To explore the effects of different types of forest environments for forest therapy, this study focused on forest resting environments. Seven representative forest resting environments found in field research in Beijing were used as independent variables and were shown to subjects by a virtual reality (VR) video. Stress level was used as the dependent variable, and blood pressure, heart rate, salivary amylase, and the Brief Profile of Mood States (BPOMS) were used as physiological and psychological indicators. A between-subjects design was used in the experiment. A total of 96 subjects were randomly assigned to each environment type, and only one type of forest resting environment was observed. Through the relevant sample t-test and one-way analysis of variance, the pre- and post-test data of the indicators were analyzed. This study found that all the seven different types of forest resting environments can produce stress relief effects to some extent. Different types of forest resting environments have different effects on relieving stress. The most natural environment does not have the most significant effect on stress relief. A water landscape has a positive effect on the relief of stress. The conclusions of this study are conducive to the better use of the forest environment for forest therapy services.

Comparison of Various Systems for On-Site Wastewater Treatment

1990 ◽  
Vol 22 (3-4) ◽  
pp. 41-48 ◽  
Author(s):  
Frits A. Fastenau ◽  
Jaap H. J. M. van der Graaf ◽  
Gerard Martijnse
Keyword(s):  
Wastewater Treatment ◽  
Large Scale ◽  
Research Work ◽  
Field Research ◽  
Limiting Factors ◽  
Land Claims ◽  
Rotating Biological Contactor ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
Selection Of

Diffuse pollution, caused by direct discharges from individual houses, small built-up nuclei, farms, camp-sites, etc., for which connection to central wastewater treatment systems is unfeasible, may be significantly reduced by on-site treatment. Based on a large scale research, including intensive field-research work on 14 systems of different types and sizes in a range equal to population equivalents (p.e) of 5 - 200 persons, 8 different types of system were compared. The comparison involved technological features, such as removal efficiency, reliability, operational and maintenance aspects, environmental impacts and land claims, together with economical features showing significant differences. Advantages and disadvantages of each system are highlighted to enable a selection of suitable systems to be made. When no limiting factors are present, it was found that - in general-infiltration systems (infiltration pits; infiltration trenches) have the best features for on-site treatment up to 100 p.e. For larger capacities, or when infiltration is not possible, the rotating biological contactor will be the best solution mainly because of the lower costs.

Development of a prototype dry decontamination method for particulate contamination: The DryCon system

2020 ◽  
Vol 15 (4) ◽  
pp. 261-273
Author(s):  
Barbara M. Alexander, PhD, PE, CIH ◽  
H. Amy Feng, MS ◽  
Gabriel Merk, BS
Keyword(s):  
Healthcare Providers ◽  
Field Research ◽  
Cold Weather ◽  
Dust Particles ◽  
Respiratory Protection ◽  
Particulate Contamination ◽  
Air Jets ◽  
Industrial Setting ◽  
Real World Applications ◽  
Different Types

Objective: This article describes the development of a prototype dry decontamination system (DryCon) for use in the event of a contamination incident involving a particulate contaminant. Disrobing and showering is currently recommended almost exclusively in mass decontamination, although it may not be feasible when water is scarce, in cold weather environments, or when there may be compliance issues with the requirement to disrobe, ie, unwillingness to disrobe. During disrobing, dust particles could also re-aerosolize, leading to inhalation of contaminants.Design: The DryCon prototype uses air jets for dry decontamination. The system is portable and can run on building-supplied 220-V power or generator power. Multiple contaminated persons can be treated rapidly, one after the other, using this system.Setting: We tested DryCon in a controlled environment, using a manikin and three different types of fabric squares to investigate its effectiveness, with a decontamination time of 60 seconds.Main outcome: At the higher airflow tested, ie, 90 percent of full blower speed or approximately 540 cfm (15 m3/minute), mean decontamination efficiencies of 56.8 percent, 70.3 percent, and 80.7 percent were measured for firefighter (FF) turnout fabric, cotton denim, and polyester double knit fabric, respectively.Results: Removal of this easily re-aerosolized fraction of the contaminants helps protect contaminated people, as well as healthcare providers they come in contact with, from the potential risk of further inhalation exposures from the re-aerosolization caused by doffing clothing.Conclusion: The results demonstrate the promise of the DryCon system for use where water is not available, as a first step prior to wet decontamination, or in an industrial setting for post-work-shift decontamination. Further lab and field research will be necessary to prove the effectiveness of this technique in real-world applications and to determine if respiratory protection or other personal protective equipment (PPE) is needed during use of the DryCon system.

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