scholarly journals A REVIEW ON MECHANICAL PROPERTIES OF NATURAL FIBRE REINFORCED CONCRETE FOR RIGID PAVEMENTS

2021 ◽  
pp. 266-270
Author(s):  
M.Venkata Naga Prasad ◽  
Dr.J.Sridhar
Keyword(s):  
Low Cost ◽  
Natural Fibers ◽  
Natural Fibre ◽  
Cement Matrix ◽  
Rigid Pavements ◽  
Steel Bars ◽  
Coconut Coir ◽  
The Impact ◽  
Coconut Fibers

This study focuses on fiber reinforcement, specifically the use of jute and coir as a fiber reinforcing material in concrete. Natural fibers have been used to provide substantial toughness and strength in a very fragile cement matrix composite. It is necessary to make effective changes in this regard. Uses a very alkaline cement matrix to achieve durability. It is preferable to have a chemical composition that is clear. Reinforce the cement and change the surface of the fibers composite. The usage of jute fiber in this article is discussed. Concrete and the impact it has on the characteristics of the concrete it produces, for example this is an attempt to review the work that has just been completed. In the discipline, as well as to establish a foundation for future study in that case. It is critical to create low-cost building and reinforcing techniques that are suited for developing countries. If agricultural by-products like coconut coir can be used to replace steel bars as reinforcement, building costs can be reduced. Down significantly the purpose of this study is to evaluate the characteristics of coconut fibers. Species produced in India and their uses in many fields of engineering, notably civil engineering enhancing the long-term durability of concrete and mortar using engineering as a building material with the addition of coconut fibers the overall objective is to look into the possibility of utilizing domestic resources. Wastes for construction on a tiny scale a review of several researchers’ experiences utilizing is presented in this publication. The performance of coconut coir as a reinforcing component is explored in depth.

scholarly journals Effect of Natural Fiber (NF) Mix on Mechanical Strength of NF Plastic Composites (NFPC)

2019 ◽  
Vol 9 (1) ◽  
pp. 5663-5667
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Natural Fiber ◽  
Fiber Type ◽  
Natural Fibers ◽  
Natural Fibre ◽  
Additional Advantage ◽  
Plastic Composites ◽  
Twin Screw ◽  
The Impact

Natural fibers from plants are gaining importance and may substitute wood in the production of wood plastic composites (WPC). To ensure continuity of fiber supply and sustainability of WPC industries, fibers of various types could be mixed together to obtain Mix WPC. However, research need to be carried out to identify the contribution of different fiber type collectively to the mechanical properties of Mix natural fiber polymer composite (NFPC). In this study, preliminary work on the use of natural fibre (NF) such as kenaf, sugar palm and pineapple leaf fibers in the preparation of Mix NFPC were carried out. Four different fiber mix samples with different fiber ratio and size were formulated using polypropylene (PP) as the polymer matrix. Montmorrilonite (MMT) filler was added at constant amount for enhancement of composite mechanical properties. Samples were mixed and prepared using a twin screw extruder and mini injection moulding resepectively. Individual fibers and NFPC prepared were characterized using thermogravimetric analyzer (TGA). Tensile, flexural and impact strength of the composites were determined. Generally, it was found that addition of fiber mix at 50% fiber loading enhance the tensile and flexural strength of the various NFPC with minimal exceptions. The impact strength of the composites were comparable to that of blank PP implying that addition of fiber gives additional advantage besides being eco-friendly. It was also found that higher kenaf loading and different size of fiber mix contribute positively to the various strengths measured. In addition to that, composition of individual fibers also contribute to the mechanical properties of the NFPCs

Fabrication of Lightweight Concrete Composites Using Natural Fibers in Thailand

2018 ◽  
Vol 765 ◽  
pp. 305-308
Author(s):  
Pat Sooksaen ◽  
Vimon Boodpha ◽  
Porntipa Janrawang ◽  
Peemmawat Songkasupa
Keyword(s):  
Compressive Strength ◽  
Lightweight Concrete ◽  
Low Cost ◽  
Coal Fly Ash ◽  
Natural Fibers ◽  
Cement Matrix ◽  
Surface Adhesion ◽  
Coconut Husk ◽  
Corn Husk ◽  
Agricultural Industries

This study developed lightweight concretes by using three different natural fibers from agricultural industries in Thailand which were corn husk fiber, bagasse fiber and coconut husk fiber. Low cost lightweight concretes in this study were fabricated using Ordinary Portland Cement type-1, coal fly ash, un-treated natural fibers and NaOH-treated natural fibers. The specimens were tested for bulk density, compressive strength, microstructure and deterioration. The result showed that the strongest concrete composite was obtained using 30 vol% fine coconut husk fiber in the concrete composition. The treated fibers showed an improvement in surface adhesion between cement matrix and fibers which resulted in higher compressive strength value.

scholarly journals ANALISIS SIFAT MEKANIS KOMPOSIT POLYESTER YANG DIPERKUAT SERAT KULIT DURIAN (DURIO ZIBETHINUS MURR) AKIBAT VARIASI FRAKSI VOLUME

2021 ◽  
Vol 4 ◽  
pp. 146-150
Author(s):  
Arthur Y. Leiwakabessy ◽  
Benjamin G. Tentua ◽  
Fany Laamena
Keyword(s):  
Impact Strength ◽  
Volume Fraction ◽  
Fiber Composite ◽  
Unsaturated Polyester ◽  
Low Cost ◽  
Natural Fibers ◽  
Cellulose Fiber ◽  
Durio Zibethinus ◽  
The Impact ◽  
Durian Rind

Durian rind fiber composite as a reinforcement is one of the interesting research areas. Some of the advantages associated with using natural fibers due to reinforcement in polymers are their non-abrasive properties and low-cost consumption. Durian rind when processed further can be made into cellulose fiber which can be used as a natural filler in unsaturated polyester composites. Among various types of natural fibers, durian skin fiber is an alternative polymer composite filler. Durian skin can be obtained easily because it is a family waste that has not been used. To get a new composite material made from durian skin waste, and to help the community and government in handling durian skin waste. The purpose of this study was to determine the maximum value of the variation of the volume fraction of durian skin fiber on the impact strength and hardness strength according to the desired application. This study uses the Hand Lay Up method, in the manufacture of single fiber composites with variations in volume fraction of durian skin fiber: polyester matrix, namely, 10%: 90%, 20%: 80%, 30%: 70%, 40%: 60% and 50 %:50%. The results showed that there was an increase in the impact strength and hardness strength with the addition of the volume fraction, where the highest impact energy for the volume fraction of durian skin fiber was 50%: 50%, 0.7738 J, and the highest impact value was 0.0096725 J/mm² and energy the lowest impact is 10%: 90%, 0.461 J. and the lowest impact price is 0.0057685 J/mm². So it can be concluded that the impact strength and hardness of the durian skin fiber composite increased with the increase in the volume fraction of the fiber.

scholarly journals Impact of Thermal Throttling on Long-Term Visual Inference in a CPU-Based Edge Device

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2106
Author(s):  
Théo Benoit-Cattin ◽  
Delia Velasco-Montero ◽  
Jorge Fernández-Berni
Keyword(s):  
Ambient Temperature ◽  
Low Cost ◽  
Critical Role ◽  
Frame Rate ◽  
Raspberry Pi ◽  
Maximum Throughput ◽  
External Temperature ◽  
Active Cooling ◽  
The Impact

Many application scenarios of edge visual inference, e.g., robotics or environmental monitoring, eventually require long periods of continuous operation. In such periods, the processor temperature plays a critical role to keep a prescribed frame rate. Particularly, the heavy computational load of convolutional neural networks (CNNs) may lead to thermal throttling and hence performance degradation in few seconds. In this paper, we report and analyze the long-term performance of 80 different cases resulting from running five CNN models on four software frameworks and two operating systems without and with active cooling. This comprehensive study was conducted on a low-cost edge platform, namely Raspberry Pi 4B (RPi4B), under stable indoor conditions. The results show that hysteresis-based active cooling prevented thermal throttling in all cases, thereby improving the throughput up to approximately 90% versus no cooling. Interestingly, the range of fan usage during active cooling varied from 33% to 65%. Given the impact of the fan on the power consumption of the system as a whole, these results stress the importance of a suitable selection of CNN model and software components. To assess the performance in outdoor applications, we integrated an external temperature sensor with the RPi4B and conducted a set of experiments with no active cooling in a wide interval of ambient temperature, ranging from 22 °C to 36 °C. Variations up to 27.7% were measured with respect to the maximum throughput achieved in that interval. This demonstrates that ambient temperature is a critical parameter in case active cooling cannot be applied.

Privatisation of Housing and the Impact of the Conservative Government's Initiatives on Low-Cost Homeownership and Private Renting between 1979 and 1984 in England and Wales: 3. Impact and Evaluation of Low-Cost Homeownership Policy

1986 ◽  
Vol 18 (7) ◽  
pp. 901-911 ◽  
Author(s):  
A D H Crook
Keyword(s):  
Low Income ◽  
Low Cost ◽  
Private Renting ◽  
Income Groups ◽  
Short Run ◽  
Low Income Groups ◽  
The Right ◽  
The Impact ◽  
Right To Buy

This is the third in a series of four papers describing and evaluating the British Government's policies of privatising housing. In this paper the research on the short-run impact of the low-cost homeownership programme is examined, by looking at the right to buy, shared ownership, improvement for sale, and homesteading, and at starter homes and licence schemes. The purchasers who have benefited from the programme are identified and the reasons for some of the failures of the policy to reach priority groups and areas of need are examined. An evaluation of the programme is made under three headings: the extent to which new investment is generated, the extent to which benefits are restricted to groups in need, and the long-term consequences of expanding homeownership amongst low-income groups. It is concluded that privatisation cannot be achieved without continued state support and regulation.

scholarly journals Preparation and Investigation of some Properties of Acrylic Resin Reinforced with Siwak Fiber Used for Denture Base Applications

2017 ◽  
Vol 2 (3) ◽  
pp. 309-314
Author(s):  
Sihama I. Salih ◽  
Jawad K. Oleiwi ◽  
Hwazen S. Fadhil
Keyword(s):  
Natural Fiber ◽  
Sodium Hydroxide Solution ◽  
Low Cost ◽  
Natural Fibers ◽  
Young Modulus ◽  
Acrylic Resin ◽  
Weight Fraction ◽  
Denture Base ◽  
Specific Strength ◽  
The Impact

Natural fibers have recently become attractive to researchers due to their low cost, fairly good mechanical properties, high specific strength, non-abrasive, eco-friendly, bio-degradability and biocompatibility  characteristics, they are exploited as a replacement for the conventional fibers, such as glass, aramid and carbon. This study investigated the influence of fiber length and weight fraction of natural siwak fiber, with the selected length of (2, 6 and 12 mm) and weight fraction (3, 6 and 9 wt %), on some of mechanical and physical properties such as (tensile, impact and hardness), in addition to test the infrared spectroscopy FTIR of the prepared denture base resin and all of these tests were carried out at laboratory temperature.The properties of PMMA reinforced by natural fiber are mainly affected by the interfacial adhesion strength between the matrix and the fiber, and in order to improve interconnection between the siwak fiber and PMMA matrix, so the siwak fibers were treated with alkali (sodium hydroxide) solution prior to use as reinforcement materials. The results illustrated that the tensile strength, young modulus, fracture toughness and hardness tended to be improved with length and concentration ratios of siwak fiber, while the impact strength and elongation percentage at break decrease with fiber content in composite samples.

Observations and Recommendations

2019 ◽  
pp. 102-113
Keyword(s):  
Low Cost ◽  
Sustainable Use ◽  
Revolutionary Change ◽  
Use Of Resources ◽  
The Future ◽  
The Government ◽  
Oil Revenues ◽  
The Impact ◽  
The City

The future of tourism and communication technology are intertwined. As Toffler observed with other revolutionary change, an inter-relationship will be difficult to predict but rewards will be substantial to those who are ahead of the curve. Two critical forces will continue to collide: increased democratization of tourism and increased focus on sustainable use of resources. The growth in incomes and the expansion of low-cost air service make China, India, and a few other developing countries the most rapidly growing tourism markets. This is particularly the case in parts of the Islamic world, resulting in rapidly expanding numbers of Muslims who seek to undertake the Haj. As detailed in a case study, this has resulted in demolition of much of ancient Mecca to make way for tourist hotels, a case where it appears the Saudi government is more interested in offsetting declining oil revenues with tourism revenues than with preservation of a unique tourism asset. Elsewhere the threat of over-tourism is evident in many places. In Europe, this is most evident in Venice where as tourism has expanded, the prices charged for overnight accommodations have shot up, forcing long-term residents to move out of the city and to endure commutes to their places of work back in the city. Local government has a choice – see the asset degrade or limit tourism. The market is well suited to limit tourism, but if the government imposes fees, say a day pass to enter the city, is this an equitable option (i.e., potentially making the city available only to wealthy visitors)? The nation of Bhutan has already imposed a high fee for visitors as a method to maintain the nation's happiness index. The future of tourism is uncertain as is the impact that technology change and concern regarding sustainability.

scholarly journals Investigation of Low-Cost and Optical Particulate Matter Sensors for Ambient Monitoring

Atmosphere ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1040
Author(s):  
Mariusz Rogulski ◽  
Artur Badyda
Keyword(s):  
Particulate Matter ◽  
Relative Humidity ◽  
Low Cost ◽  
Reference Station ◽  
Correction Function ◽  
Maximum Temperature ◽  
Large Set ◽  
Campaign Evaluation ◽  
The Impact

This article presents a long-term evaluation of low-cost particulate matter (PM) sensors in a field measurements campaign. Evaluation was performed in two phases. During the first five months of the campaign, two PM sensors were simultaneously compared with the results from the reference air quality monitoring station in various atmospheric conditions—from the days with freezing cold (minimum temperature below −10 °C) and high relative humidity (up to 95%) to the days with the maximum temperature above 30 °C and low relative humidity (at the level of 25%). Based on the PM10 measurements, the correlation coefficients for both devices in relation to the reference station were determined (r = 0.91 and r = 0.94, respectively), as well as the impact of temperature and relative humidity on measurements from the low-cost sensors in relation to the reference values. The correction function was formulated based on this large set of low-cost PM10 measurements and referential values. The effectiveness of the corrective function was verified during the second measurement campaign carried out in the city of Nowy Sącz (located in southern Poland) for the same five months in the following year. The absolute values of the long-term percentage errors obtained after adjustment were reduced to a maximum of about 20%, and the average percentage errors were usually around 10%.

Processing and Evaluation of Mechanical Properties of Coconut Coir and Rice Husk Reinforced Natural Hybrid Composites

2019 ◽  
Vol 895 ◽  
pp. 176-180
Author(s):  
C.K. Yogish ◽  
S. Pradeep ◽  
B. Kuldeep ◽  
K.P. Ravikumar ◽  
Rao R. Raghavendra
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Materials ◽  
Flexural Strength ◽  
Rice Husk ◽  
Hybrid Composites ◽  
Natural Fibers ◽  
Coir Fiber ◽  
Coconut Coir ◽  
The Impact

Over the last decades composite materials, plastics and ceramics have been the dominant emerging materials. The volume and number of applications of composite materials have grown steadily, penetrating and conquering new markets relentlessly. So everybody is concentrating on new materials which will be strong enough, less weight, recyclable with reduced cost. Hence all the researchers are concentrated on the composite materials which have all the above properties. The present work is concentrated on coconut coir fiber and Rice husk reinforced polyester hybrid composites. The composites specimen was fabricated with various weight percentages of natural fibers namely coconut coir (20%, 15%, 10%, and 5%) and Rice husk (15%, 10%, and 5%) combined with CamElect 3321 resin using hand lay-up method. So to obtain new composite materials different proportions of coconut coir and Rice husk is added and the mechanical properties such as Tensile strength, Flexural Strength and Impact test were carried out for the samples cut from the fabricated composites specimen to the dimensions as per ASTM standard. With the increasing percentage of the reinforcements the performance of the material is improving. The tensile strength increases with the increase in coir reinforcement percentage and flexural strength increases with the increasing in percentage of the rice husk and the impact strength of the material gets boost with equal proportional percentage of coconut coir and rice husk reinforcement.

scholarly journals Implications of a Soy-Based Diet for Animal Models

2021 ◽  
Vol 22 (2) ◽  
pp. 774
Author(s):  
Justine Dhot ◽  
Valentine Prat ◽  
Marine Ferron ◽  
Virginie Aillerie ◽  
Angélique Erraud ◽  
...  
Keyword(s):  
Animal Models ◽  
Diastolic Dysfunction ◽  
Low Cost ◽  
New Drugs ◽  
Male Rats ◽  
Absolute Requirement ◽  
Diet Versus ◽  
Bias Attention ◽  
The Impact

The use of animal models in fundamental or pre-clinical research remains an absolute requirement for understanding human pathologies and developing new drugs. In order to transpose these results into clinical practice, many parameters must be taken into account to limit bias. Attention has recently been focused on the sex, age or even strain of each animal, but the impact of diet has been largely neglected. Soy, which is commonly used in the diet in varying quantities can affect their physiology. In order to assess whether the presence of soy can impact the obtained results, we studied the impact of a soy-based diet versus a soy-free diet, on diastolic function in a rat model based on transgenic overexpression of the β3-adrenergic receptors in the endothelium and characterized by the appearance of diastolic dysfunction with age. Our results show that the onset of diastolic dysfunction is only observed in transgenic male rats fed with a soy-free diet in the long term. Our study highlights the importance of the diet’s choice in the study design process, especially regarding the proportion of soy, to correctly interpret the outcome as low-cost diets are more likely to be highly concentrated in soy.

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