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Articles de revues sur le sujet « Analysis of natural materials »

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Auteur : Grafiati

Publié le 10 mars 2023

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1

Ramakrishna, Ganga, P. Kiran babu, K. Purushothaman, E. R. Sivakumar et M. Sreenivasan. « An analysis on natural fiber composite materials ». Materials Today : Proceedings 45 (2021) : 6794–99. http://dx.doi.org/10.1016/j.matpr.2020.12.767.

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Vandenabeele, Peter, Mayahuel Ortega-Avilès, Dolores Tenorio Castilleros et Luc Moens. « Raman spectroscopic analysis of Mexican natural artists’ materials ». Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy 68, n^o 4 (décembre 2007) : 1085–88. http://dx.doi.org/10.1016/j.saa.2007.01.031.

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Bashorov, Musa, Georgiy Kozlov, Gennady Zaikov et Abdulakh Mikitaev. « Polymers as Natural Nanocomposites. 2. The Comparative Analysis of Reinforcement Mechanisms ». Chemistry & ; Chemical Technology 3, n^o 3 (15 septembre 2009) : 183–85. http://dx.doi.org/10.23939/chcht03.03.183.

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The complete similarity of reinforcement degree behaviour has been shown for nanocomposite epoxy polymer/Na+-montmorillonite and polyarylate, which is considered as the natural nanocomposite. The polyarylate structure description is given within the framework of cluster model of polymers amorphous state structure. The interfacial adhesion level influences strongly the reinforcement degree of indicated materials.

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Gualtieri, A. F., A. Viani, G. Banchio et Gilberto Artioli. « Quantitative Phase Analysis of Natural Raw Materials Containing Montmorillonite ». Materials Science Forum 378-381 (octobre 2001) : 702–9. http://dx.doi.org/10.4028/www.scientific.net/msf.378-381.702.

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Loukidis, Andronikos, Ermioni D. Pasiou, Nicholas V. Sarlis et Dimos Triantis. « Fracture analysis of typical construction materials in natural time ». Physica A : Statistical Mechanics and its Applications 547 (juin 2020) : 123831. http://dx.doi.org/10.1016/j.physa.2019.123831.

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Oliveira, Leandro S., Mauri Fortes et Kamyar Haghighi. « CONJUGATE ANALYSIS OF NATURAL CONVECTIVE DRYING OF BIOLOGICAL MATERIALS ». Drying Technology 12, n^o 5 (janvier 1994) : 1167–90. http://dx.doi.org/10.1080/07373939408960994.

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J, Okerio. « Comparative DMA Analysis of a Natural Based Potential Adhesive Extracts from Caesalipinia Decapelata ». Physical Science & ; Biophysics Journal 6, n^o 2 (5 juillet 2022) : 1–3. http://dx.doi.org/10.23880/psbj-16000214.

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Adhesives have for long been developed from plant and animal materials. This includes animal proteins like casein and plant materials such as starches and dextrin’s which form precursors to synthetic adhesives. In this work, the mechanical properties of the extracted, isolated pod latex/adhesive samples of the Caesalipinia decapelata species were investigated using the Dynamic Mechanical Analysis (DMA) to study cure behavior of the adhesive observed on application of stress over a range of temperatures. The cure properties of this natural adhesive were compared to commercially available adhesives.

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Morante-Carballo, Fernando, Néstor Montalván-Burbano, Paúl Carrión-Mero et Kelly Jácome-Francis. « Worldwide Research Analysis on Natural Zeolites as Environmental Remediation Materials ». Sustainability 13, n^o 11 (4 juin 2021) : 6378. http://dx.doi.org/10.3390/su13116378.

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Society faces a significant problem in regards to the spread of harmful products in the environment, primarily caused by accelerated growth and resource consumption. Consequently, there is a need for materials to be processed in less harmful ways and to remedy the contaminated sources they generate. Microporous materials have been studied for a long time and are used in waste treatment alternatives. Natural zeolites, on which this study is based, are attractive to the scientific and technological communities, due to their numerous applications as decontaminants and adsorption properties. This study analyzes the intellectual structures of publications related to natural zeolites in environmental remediation, using bibliometric methods to determine their volumes and trends. The methodology comprises of an analysis based on 1582 articles, using VOSviewer software, with data from 1974 to 2020, via the Scopus database. Results reflect a notable increase in publications from the end of the 1990s; the greatest contribution in the area comes from Eurasian countries. The study considers that development in this line of research will continue to increase and serve as a great contribution to preserve the environment in coming years, with themes that focus on water treatment (e.g., drinking water, wastewater, greywater), removal of heavy metals, ammonium, ammonia, and construction.

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Lakshmanan, D., R. Naveen, P. Saravanan, D. Nivitha et R. R. Mathi Vathana. « Experimental Analysis on Water Absorption Behaviour of Natural Composite Materials ». IOP Conference Series : Materials Science and Engineering 995 (15 décembre 2020) : 012045. http://dx.doi.org/10.1088/1757-899x/995/1/012045.

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Florea, Iacob, et Daniela Lucia Manea. « Analysis of Thermal Insulation Building Materials Based on Natural Fibers ». Procedia Manufacturing 32 (2019) : 230–35. http://dx.doi.org/10.1016/j.promfg.2019.02.207.

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Iqbal, Mohammad S., Shazma Massey, Jamshed Akbar, Chaudhary M. Ashraf et Rashid Masih. « Thermal analysis of some natural polysaccharide materials by isoconversional method ». Food Chemistry 140, n^o 1-2 (septembre 2013) : 178–82. http://dx.doi.org/10.1016/j.foodchem.2013.02.047.

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Oyen, Michelle L., et Ching-Chang Ko. « Indentation variability of natural nanocomposite materials ». Journal of Materials Research 23, n^o 3 (mars 2008) : 760–67. http://dx.doi.org/10.1557/jmr.2008.0103.

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Small-scale depth-sensing indentation (nanoindentation) is a popular technique for measuring the mechanical properties of a wide range of materials. Contact mechanics solutions used in data analysis are based on the indentation of a homogeneous half-space, but the experiments are frequently conducted on mineralized biological tissues—biocomposite materials with nanometer-scale features—such as bone and dentin. The current study examines the experimental indentation response of bone across orders of magnitude in contact dimension length-scale, from nanometers to micrometers. Scaling arguments are used to establish the need for nanoscale simulations of mineralized tissue indentation. A finite element model of an inhomogeneous contact problem is developed and used to interpret experimental indentation data on bone and dentin. Both experimental data and modeling results demonstrate a convergence in apparent elastic modulus at increasing contact length-scales. Models results are used to estimate a feature size associated with inhomogeneity of the indentation response; for experiments conducted here the characteristic feature size is found to be substantially larger for bone than for dentin, and in both cases larger than for individual nanometer-scale mineral platelets.

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Sutarmin, Akhmad Darmawan, Siti Nur Azizah et Dadang Prasetyo Jatmiko. « An empirical evidence : supplier behavior in the natural materials of buyer – supplier relationship ». Problems and Perspectives in Management 15, n^o 1 (10 mai 2017) : 158–65. http://dx.doi.org/10.21511/ppm.15(1-1).2017.02.

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This research is a case study belonging to the historical research. The data were taken from the Department of Natural Product Buying and Financial and Controlling XYZ CORP. XYZ CORP is a manufacturing enterprise and exporter of clove oil and its derivatives to the world with a market share of about 55% of the world market. This study aims to empirically examine and study the ethical behavior of suppliers in the ever-changing business environment. The analysis tool used is the Mann Whitney test with SPSS 17.0 software. Based on the survey results it was revealed that for natural raw materials, the average purchase price between the rainy season and the dry season does not differ significantly, but the cost of purchase in the dry season, and the rainy season varies significantly. In this study, the price does not affect the acquisition of raw materials purchased from suppliers. The results of this study also obtained empirical evidence that the trading patterns of natural raw materials are strongly influenced by the behavior or ethics of suppliers, in addition to weather factors or uncertain climate.

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Vasil'ev, E. K. « Database for Qualitative X-Ray Diffraction Phase Analysis of Natural Materials ». Materials Science Forum 79-82 (janvier 1991) : 271–76. http://dx.doi.org/10.4028/www.scientific.net/msf.79-82.271.

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Murali, B., B. Vijaya Ramnath et D. Chandramohan. « Crash Test Analysis on Natural Fiber Composite Materials for Head Gear ». Indian Journal of Science and Technology 10, n^o 8 (1 février 2017) : 1–5. http://dx.doi.org/10.17485/ijst/2017/v10i8/108443.

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Zhang, Mengru, et Zhexu Xi. « Analysis and Research on Corrosion Law of Natural Environment of Materials ». IOP Conference Series : Materials Science and Engineering 677 (10 décembre 2019) : 022041. http://dx.doi.org/10.1088/1757-899x/677/2/022041.

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Peponi, Laura, Jerico Biagiotti, Luigi Torre, Josè M. Kenny et Iñaki Mondragòn. « Statistical analysis of the mechanical properties of natural fibers and their composite materials. I. Natural fibers ». Polymer Composites 29, n^o 3 (mars 2008) : 313–20. http://dx.doi.org/10.1002/pc.20408.

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Bresee, Randall R., et Zanyao Yan. « Automating Analysis of Fibrous Materials ». Microscopy and Microanalysis 4, S2 (juillet 1998) : 836–37. http://dx.doi.org/10.1017/s1431927600024302.

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Natural fibers generally lack uniformity and large numbers of measurements often must be obtained to achieve estimates of sample parameters having reasonable levels of precision and confidence. This problem calls for automating the measurement and data analysis processes so obtaining a large amount of data is practical. We will discuss hardware and software designs used in our laboratory to automate microscope measurements and data analysis for fibrous materials.Automating the measuring process requires constructing hardware to accomplish several tasks. Hardware should accommodate large-sized samples when they lack uniformity since many measurements are desirable. Sample positioning should be automated to remove the operator from the data acquisition process and eliminate a source of operator-dependent positioning error. Lens focusing should be automated since it is difficult to maintain flatness for large samples and the thickness of many samples exceeds the depth-of-focus of lenses. Finally, the quality of illumination provided to all sample locations during measurement should be flexible and consistent.

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Kumar, Dhananjay, Pankaj Pandey et Dr Lakhan Patidar. « Structural Analysis of Airplane Wing Using Composite and Natural Fiber Materials : A Survey ». International Journal for Research in Applied Science and Engineering Technology 11, n^o 1 (31 janvier 2023) : 575–86. http://dx.doi.org/10.22214/ijraset.2023.48634.

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Abstract: Natural fiber-reinforced polymer-based composites are increasingly used in modern society due to their numerous benefits for uses in mechanical engineering. Polymer-based composite materials are widely employed in civil construction, automotive, aerospace, and many other industries due to their many benefits. Natural fibers can be used to create new, highperformance polymer materials because they are affordable, environmentally friendly, renewable, and partially and fully biodegradable. Examples of these fibers include EGR Glass R Glass, Carbon fiber, and S Glass, as well as kenaf, pineapple, sugarcane, hemp, oil palm, flax, and leaf. The purpose of this study is to explore the use of natural fibers and composites in the production of airplane wings, including mechanical characteristics, applications, and potential as well as problems and future demand for natural composite materials for engineering uses. A good 50% of the airspace's components are natural composites. Because natural composites have the ability to lower aircraft weight, they are currently being used to construct helicopters, military fighter aircraft, small and large civil transport aircraft, cockpits, satellites, launch vehicles, and missiles. Rudder, spoilers, LG doors, keel beam, airbrakes, elevators, turbine engine fan blades, propellers, rear bulkhead, wing ribs, main wings, interior fixtures, etc. Composites made of natural fibers are attractive and promising. The use of natural fiber-based composite materials is growing daily due to their strength and integrity. The natural fiber is a renewable, environmentally beneficial, and biodegradable raw material. Both its mechanical and thermal insulation qualities are strong in natural fiber. However, the loading placed on the natural fiber and its youthful modulus determines its strength In addition to discussing the benefits of natural fibers over other materials, this paper provides a description of the several types of natural fiber, their physical and mechanical properties, and their advantages.

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KATO, Yasuyuki. « Finite Deformation Analysis Using Natural Strain ». JSME International Journal Series A 49, n^o 3 (2006) : 436–43. http://dx.doi.org/10.1299/jsmea.49.436.

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Buzina, Daria, Igor Engovatov, Dinh Dap Nguyen et Artur Ovakimyan. « Natural radioactivity of finish and masonry materials ». MATEC Web of Conferences 196 (2018) : 04064. http://dx.doi.org/10.1051/matecconf/201819604064.

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Research findings of natural radioactivity of materials widely used in industrial and civil construction, are presented. The research is carried out according complex techniques which include measurement and calculation of radiation parameters establishing natural radioactivity of materials – specific radioactivity of 226Ra, 232Th, 40K, summarised specific radioactivity, equivalent dose rate and radon flow density. Finish and masonry materials were used as principle objects of the research. The obtained findings allow to make a conclusion that all the studied materials are related to the first class and may be used unrestricted. Comparison with foreign data is provided. Correlation between radiation parameters is established. The data received may be deployed for comparative analysis of the Russian and European approaches to assessment of radiation safety to use the studied types of building materials.

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Sharpless, Katherine E., et David L. Duewer. « Standard Reference Materials for Analysis of Dietary Supplements ». Journal of AOAC INTERNATIONAL 91, n^o 6 (1 novembre 2008) : 1298–302. http://dx.doi.org/10.1093/jaoac/91.6.1298.

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Abstract National Institute of Standards and Technology (NIST), in collaboration with the National Institutes of HealthOffice of Dietary Supplements and the U.S. Food and Drug Administration, is producing Standard Reference Materials (SRMs) for dietary supplements. These and other natural-matrix SRMs should be used in method validation, characterization of in-house quality control materials, and to establish traceability.

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Bosoanca, Radu, Vasile Bria, Claudiu MereuȚă, Adrian Cîrciumaru et Iulian-Gabriel Bîrsan. « Tensile Analysis of Fabric Reinforced Materials ». Materiale Plastice 56, n^o 4 (30 décembre 2019) : 705–14. http://dx.doi.org/10.37358/mp.19.4.5257.

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The analysis of reinforced polymers is one of the most important sources of information for materials properties designers. In this regard, due to their intrinsic properties, the fabrics play an essential role when they are used as reinforcement elements. The composites properties can be designed by alternating various types of fabrics, by modifying the orientation of every reinforcement layer, by modifying the matrix properties or by choosing the matrix. This study regards the tensile behavior of four fabric reinforced composites with four different epoxy resins as matrix. All the materials have the same reinforcement structure but the matrix is, in each case, another epoxy resin and more two classes of materials had been studied one is containing the natural polymerized matrix materials and the other one the materials that had been thermally treated according to technical sheet of each polymer. The tests were done one year after the materials formation.

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Peponi, Laura, Jerico Biagiotti, Josè M. Kenny et Iñaki Mondragòn. « Statistical analysis of the mechanical properties of natural fibers and their composite materials. II. Composite materials ». Polymer Composites 29, n^o 3 (mars 2008) : 321–25. http://dx.doi.org/10.1002/pc.20386.

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Krasner, S. W. « The use of reference materials in sensory analysis ». Water Science and Technology 31, n^o 11 (1 juin 1995) : 265–72. http://dx.doi.org/10.2166/wst.1995.0445.

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In descriptive sensory techniques, reference materials are used to establish a common vocabulary for various aromas and flavors. A reference standard can be any chemical or natural material that adequately represents the particular characteristic described. This paper evaluates the utility of various reference materials that have been proposed as odor standards. The odor reference library used included odors commonly attributable to microbiological and industrial sources. The results of utilizing reference standards demonstrated that some materials were very good; that is, they yielded a distinctive odor that transcended cultural and language differences, as well as different levels of experience. Other aromas required several standards to distinguish among subtle but important differences, e.g., geosmin and 2-methylisoborneol to differentiate earthy/musty odors. These standards also included natural materials prepared in various states to reference different types of common odors in water - for example, grass clippings (in water) that had been freshly cut to represent a grassy odor, or had been held for a week to represent a septic odor, as well as dried grass for a hay odor. Other reference materials yielded bimodal distributions in which, primarily, two groups centered around different descriptors; these kinds of materials would not make good reference standards.

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Salishcheva, O. V., Yu V. Tarasova, S. S. Lashitskiy et N. E. Moldagulova. « Analysis of kinetic and equilibrium adsorption of heavy metals by natural materials ». IOP Conference Series : Earth and Environmental Science 640, n^o 6 (1 février 2021) : 062007. http://dx.doi.org/10.1088/1755-1315/640/6/062007.

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Coleman, W. M., J. L. White et T. A. Perfetti. « A Hyphenated GC-Based Quantitative Analysis of Volatile Materials from Natural Products ». Journal of Chromatographic Science 32, n^o 8 (1 août 1994) : 323–27. http://dx.doi.org/10.1093/chromsci/32.8.323.

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Alabdulkarem, Abdullah, Mohamed Ali, Gino Iannace, Shereef Sadek et Redhwan Almuzaiqer. « Thermal analysis, microstructure and acoustic characteristics of some hybrid natural insulating materials ». Construction and Building Materials 187 (octobre 2018) : 185–96. http://dx.doi.org/10.1016/j.conbuildmat.2018.07.213.

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Wardani, V., L. Rohmawati, W. Setyarsih, D. Alfarisi et A. Subhan. « Analysis of Charging/Discharging Supercapacitor Active Carbon/rGO Based on Natural Materials ». Journal of Physics : Conference Series 1491 (mars 2020) : 012044. http://dx.doi.org/10.1088/1742-6596/1491/1/012044.

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Blank, A. B., et L. P. Eksperiandova. « Specimen preparation in x-ray fluorescence analysis of materials and natural objects ». X-Ray Spectrometry 27, n^o 3 (mai 1998) : 147–60. http://dx.doi.org/10.1002/(sici)1097-4539(199805/06)27:3<147 ::aid-xrs263>3.0.co;2-p.

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Santamaría Ortega, Arturo, Miguel Angel Rubio Toledo, Ricardo Victoria Uribe et Sandra Alicia Utrilla Cobos. « Natural Materials to Absorb Water from Environment ». Applied Mechanics and Materials 835 (mai 2016) : 329–32. http://dx.doi.org/10.4028/www.scientific.net/amm.835.329.

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In nature, there is a large number of materials to be discovered, all with different characteristics and for certain functions. In the case of plants, they are responsible for collecting, taking care and protect water naturally.In Mexico there are different plants of the cactus family, which catch and retain water for their existence, so some plants collect more volume of body water than they have. It is very important for this investigation.In Mexico and throughout the continent there is a common cactus or chumbera that easily adapts to the environment and very rampant in this country, so that its study and analysis makes it one of the most important natural systems for this research, because 95% of it is water and the other 5% is organic material.Later, the common Maguey or agave plant is analyzed, which is important for the history of ancient Mexico, this long before the Spaniards arrived in America. The agave juice and whole plant were an important part of Mexican culture [1], even today is used in many regions and is an important part of the economy in this country.Last but not least is the barrel cactus plant, which surprisingly lets us see how natural systems build structural and formal elements in order to the creation and configuration of new materials that can significantly help to collect water.

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Kralevich, Mark L., et Jack L. Koenig. « FTIR Analysis of Silica-Filled Natural Rubber ». Rubber Chemistry and Technology 71, n^o 2 (1 mai 1998) : 300–309. http://dx.doi.org/10.5254/1.3538486.

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Abstract The interactions of silica filler in zinc activated, sulfur vulcanized cis-1,4-polyisoprene (IR) were characterized using Fourier Transform Infrared (FTIR)-Attenuated Total Reflectance (ATR) spectroscopy. The variables examined were increased levels of silica and quality of mixing of the batch. The increased silica level resulted in band broadening and a frequency shift to lower wavenumbers of the silica absorbance region (1250-1000 cm−1) due to a combination of physical and chemical adsorption of the rubber and parts of cure system on the silica surface. The peaks that appeared near 1040 and 1017 cm−1 were attributed to physical interactions between silica and the natural rubber. However some chemical bonding of the IR was present as a result of a free radical reaction that takes place during the milling process. Inefficient mixing had an affect comparable to adding less filler, according to the results above. That is, there was less “effective” filler in the poorly mixed samples because poor dispersion promotes agglomeration of the polar silica in the nonpolar hydrocarbon rubber.

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Zhao, Yafan, et Mingda Song. « Failure analysis of a natural gas pipeline ». Engineering Failure Analysis 63 (mai 2016) : 61–71. http://dx.doi.org/10.1016/j.engfailanal.2016.02.023.

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Wu, Xiao, Zhaoting Wang, Mei Dong, Longfei Dong et Quan Ge. « A Critical Analysis of Natural Gas Liquefaction Technology ». Fluid Dynamics & ; Materials Processing 18, n^o 1 (2022) : 145–58. http://dx.doi.org/10.32604/fdmp.2022.018227.

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Chwał, Małgorzata. « Nonlocal Analysis of Natural Vibrations of Carbon Nanotubes ». Journal of Materials Engineering and Performance 27, n^o 11 (1 octobre 2018) : 6087–96. http://dx.doi.org/10.1007/s11665-018-3673-3.

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Yesham, Ashwini, S. P. Jani et Sujin Jose. « Mechanical Property Analysis of Surface Modified Natural Fiber/Filler Hybrid Composite ». Materials Science Forum 1075 (30 novembre 2022) : 141–48. http://dx.doi.org/10.4028/p-l80036.

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The filler materials are supported alongside natural fiber in the composite to work on the quality and property of the part materials given the prerequisites and their applications. In this paper, the mixture composite was created with Hemp/Carbon fiber. Different wt% (15%,20%,25%) of Hemp fiber and filler materials were utilized as support. The Hemp fiber was surface treated with 5% of KMnO4. The created hybrid fiber composites were performed with different mechanical properties concentrated on like tensile, bending, impact, and Brinell hardness this multitude of tests were proceeded according to ASTM guidelines. From the mechanical property study, 25 wt% Hemp fiber cross breed composite hold great mechanical properties contrasted with any remaining wt% created half breed composite. keywords:- hybrid composite, surface treatment, mechanical property, fillers.

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Aquino, Carlos, Shogo Yagi et Takahisa Okamoto. « Fracture Energy Analysis of Eco-Concretes in Japan ». Advanced Materials Research 168-170 (décembre 2010) : 985–89. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.985.

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The raw materials from household garbage and industrial waste have increased its usage in the concrete and cement industries. These eco-materials have helped the environment, avoiding pollution, land filling or burning of waste and the usage of other natural resources. However, the cost of many eco-materials is still higher than that of common natural materials. It is necessary to study in detail its behavior and properties to decrease its cost and increase its performance. This research deals with Eco-cement and molten slag aggregate which main raw materials are household garbage and industrial waste. Concretes produced with Portland cement and Eco-cement were mixed with gravel, limestone, quartz and molten slag aggregates to compare its properties. The fracture energy, strength and modulus of elasticity tests were performed and discussed in this paper. The concretes produced with Eco-cement and molten slag aggregate show better results than those produced with Portland cement and natural aggregates.

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Biks, Yuriy, Georgiy Ratushnyak, Olga Ratushnyak et Pavlo Ryapolov. « Application of AHP and GRA methods in energy efficiency potential’s assessment of envelopes from natural materials ». Theory and Building Practice 2020, n^o 2 (20 novembre 2020) : 48–62. http://dx.doi.org/10.23939/jtbp2020.02.048.

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The best choice of energy efficient envelope from variety of available materials is still the challenge. Therefore, the attempt of thermal performance multi-criteria evaluation of some building materials of natural origin for energy-efficient envelopes is conducted in present paper. Such types of walls from natural energy-efficient materials are considered in comparison assessment: hempcrete, adobe, strawbale panel, earthbag, cordwood, SIP (plywood+ecofiber), hempcrete+straw and energy efficient block. The influence of thermal inertia time, internal areal heat capacity, as well dimensionless index of thermal inertia D, the total thermal resistance of the walls Rtot-value, mass of the wall assembly and its cost have been taken into consideration as important influence factors. The multi-criteria numerical assessment of envelope’s energy efficiency potential was performed by two popular methods – Analytic Hierarchy Process (AHP) as the subjective weighting method and Grey Relation Analysis (GRA) as the objective weighting method. Both of methods allow to arrange the alternatives and could be applied as decision support tools in decision making (DM) process of choosing the best alternative in terms of multi-criteria assessment. For more objective analysis, by taking into account the variety of physical and physical-mechanical parameters of the wall assembly material, the concept of generalized index of the envelope energy efficiency potential is proposed. Conducted research has shown that the best envelope type in terms of of generalized index of energy efficiency potential has the hempcrete wall and hemcrete+straw wall, almost three times smaller has the wall of the earthbags. The walls from adobe, cordwood and strawbale panels have practically the equal value of generalized index of energy efficiency potential. It could be observed that AHP method shown more inhomogeneous results, than GRA. The possible reason for that is the difference in evaluation attitude in techniques - AHP is considered as the subjective method with pairwise comparison matrixes, while GRA is objective method of comparison.

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Saravanan, K. G., R. Prabu, A. Sivapragasam et Nahom Daniel. « Comparative Analysis of Natural Fibre Reinforced Composite Material Using ANSYS ». Advances in Materials Science and Engineering 2021 (31 août 2021) : 1–17. http://dx.doi.org/10.1155/2021/9391237.

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The regulations of legislative bodies regarding the recycling and reusage of automotive materials has caused a great deal of obligation among automotive manufacturers to use natural fibres or green composites. Green composites or more commonly known as bio-composites are made up of natural fibres. Natural fibres are used by humankind since prehistoric times. The natural fibre is obtained from plants as well as animals. Since the natural fibre is obtained from natural as well as biological resources, it is biodegradable and recyclable. This paper presents the study and analysis conducted to address the suitability of natural fibre in the automotive industry. This paper discusses the finite element analysis of four different natural fibre composites used for making car door panel, i.e., flax, jute, sisal, and leather are taken for the material study. This paper helps to find the effectiveness of each of the four natural fibre composites that have already been used in the automotive sector. This paper includes the analysis of four different natural fibres with and without the addition of the aluminium as the reinforcement material. This project revolves around the design of the composite fibre sheet and analysis of the mechanical parameters such as equivalent stress, shear stress, strain, deformation, and so on. The studies and observations of the analysis showed that the natural fibre with the aluminium reinforcement proved to be much stronger than that without the reinforcement. The results of finite element analysis showcased lowest total deformation and equivalent strain in the flax as 1.026 m and 0.017 mm/mm, respectively. However, sisal showed the lowest equivalent stress and shear stress which were 68.09 and 38.178 MPa, respectively. Additionally, leather showed the highest amount of stress, strain, and deformation, and hence leather was deemed to have undesirable properties regarding the usage in car door panels. All the materials except leather were found to be safe under the loading conditions. Hence, the flax fibre is recommended by the project to have superior properties compared to the other materials.

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Bramastha, Aqsal Raja, Made Sucipta et Hendra Wijaksana. « Analysis of the Characteristics of Natural Materials as Adsorbents in Air Conditioning Adsorption ». Natural Sciences Engineering and Technology Journal 2, n^o 2 (29 mars 2022) : 110–15. http://dx.doi.org/10.37275/nasetjournal.v2i2.20.

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The use of an air conditioner (AC) increases the use of compressors and electricity supply quite significantly. This will increase global warming and the occurrence of an energy crisis. Referring to this, a cooling system that is more energy-efficient and environmentally friendly is needed. One alternative is to use natural materials as adsorbents in adsorption air conditioning. In this system, changes in humidity levels occur due to the process of absorption of air moisture in each test material in the packed bed. The purpose of this research is to determine the regeneration characteristics of natural materials and activated carbon, as well as their performance against moisture. The characteristics tested also include contact angle test and proximate test. In addition to the type of material, mass variations of 200gr, 400gr, and 600gr are also carried out as well as variations in the combination between materials. The results obtained from the regeneration test 9 times, natural ingredients affect air conditioning. The larger the mass tested, the greater its ability to reduce humidity. In another sense, 600gr activated carbon provides the most optimal performance among other natural materials, both in mass variations and combined variations.

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Hinz, T. H., et R. Eggers. « Determination of porosity and particle size of natural bulk materials using image analysis ». Food / Nahrung 40, n^o 3 (1996) : 116–24. http://dx.doi.org/10.1002/food.19960400305.

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Rajagopal, A., et P. Steinmann. « Towards the analysis of materials with strain gradient effects using -Natural Element Method ». PAMM 8, n^o 1 (décembre 2008) : 10255–56. http://dx.doi.org/10.1002/pamm.200810255.

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Lu, F. J., et S. L. Hsu. « A Vibrational Spectroscopic Analysis of the Structure of Natural Rubber ». Rubber Chemistry and Technology 60, n^o 4 (1 septembre 1987) : 647–58. http://dx.doi.org/10.5254/1.3536148.

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Abstract It is not an overstatement to say that natural rubber (NR) is one of the most used polymers. There are numerous studies dealing with the structural aspects of rubber which give rise to its elastic property. However, it should be emphasized that the majority of these studies are generally concerned with rubber in the vulcanized state or, in fact, dealing with the vulcanization process. Relatively few studies have actually been directed at a better understanding of the composition, structure, and properties of raw rubber. This area of study is also important because the composition and the structure of NR differ from synthetic polyisoprene in that the presence of functional groups on main chains and nonrubbery materials, such as proteins, can significantly affect the rheological properties and the processing conditions of rubber before the vulcanization process. Raw rubber can be divided into two different fractions, sol (soluble part) and gel (insoluble part). Of course, this definition depends somewhat on the solvent used. Even though the main chain in both portions of rubber are chemically similar, their significantly distinct mechanical properties have, in fact, been attributed to the nonrubbery materials such as proteins interacting with isoprene chains. It is generally accepted that the amount of nonrubbery materials in the gel fraction is much higher than the sol fraction. The protein apparently interacts quite strongly with specific functional groups on the isoprene chain and is difficult to remove from the gel phase by physical means. It is probable that the different properties between sol and gel rubber is due to the amount of crosslinking of the main chains, but several aspects of the structure need to be answered in greater detail. We know, for example, that the amount of gel fraction can change as a function of extraction solvent. Therefore, one cannot conclude that the interaction between rubber chains even in the gel fraction is strictly chemical in nature. Our premise is that the protein is an important component connecting the isoprene chains.

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Olejnik, Olga, Anna Masek et Adam Kiersnowski. « Thermal Analysis of Aliphatic Polyester Blends with Natural Antioxidants ». Polymers 12, n^o 1 (2 janvier 2020) : 74. http://dx.doi.org/10.3390/polym12010074.

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The aim of this research was to enhance thermal stability of aliphatic polyester blends via incorporation of selected natural antioxidants of plant origin. Thermal methods of analysis, including differential scanning calorimetry (DSC) and thermogravimetry (TGA), are significant tools for estimating the stabilization effect of polyphenols in a polymer matrix. Thermal stability was determined by analyzing thermogravimetric curves. Polymers with selected antioxidants degraded more slowly with rising temperature in comparison to reference samples without additives. This property was also confirmed by results obtained from differential scanning calorimetry (DSC), where the difference between the oxidation temperatures of pure material and polymer with natural stabilizers was observed. According to the results, the materials with selected antioxidants, including trans-chalcone, flavone and lignin have higher oxidation temperature than the pure ones, which confirms that chosen phytochemicals protect polymers from oxidation. Moreover, based on the colour change results or FT-IR spectra analysis, some of the selected antioxidants, including lignin and trans-chalcone, can be utilized as colorants or aging indicators. Taking into account the data obtained, naturally occurring antioxidants, including polyphenols, can be applied as versatile pro-ecological additives for biodegradable and bio-based aliphatic polyesters to obtain fully environmentally friendly materials dedicated for packaging industry.

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Chen, Chiou Chuan, et Chuan Chen Lee. « Research of Waste Recycling Natural Fiber Materials at Green Roof ». Applied Mechanics and Materials 496-500 (janvier 2014) : 2407–10. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.2407.

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In this study, the use waste of natural fiber applied in building facades and green roofs vegetation materials to reduce production costs and price, prompting facade green roof vegetation universal use, reduce the heat island effect to improve indoor and outdoor microclimate environment and ecological house in Taiwan, ecological communities, ecological city to create an inject vitality. The media of planting Cynodon spp. and Eremochloa ophiuroides material through quantitative data analysis and comparison of the 3 groups selected on material that suits the media light (670g), saturated moisture content (218%), low-cost ($1.1 USD). Planting Angelonia salicariifolia,Orthosiphon aristatus,Barleria repens material 17 group, through quantitative data analysis and comparison of the 3 groups selected of material that suits the media light (950g), saturated moisture content (241%), low-cost ($1.4 USD).

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Pisello, Anna Laura, et Federica Rosso. « Natural Materials for Thermal Insulation and Passive Cooling Application ». Key Engineering Materials 666 (octobre 2015) : 1–16. http://dx.doi.org/10.4028/www.scientific.net/kem.666.1.

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In this chapter a critical analysis about natural materials to enhance energy performance and thermal comfort in indoor and outdoor spaces is dealt with. In particular, thermal insulation and passive cooling application in buildings are analyzed. The physical properties permitting to achieve these benefits are presented, as well as the method and the international standards to measure them. Benefits deriving from these materials’ employment as insulation layers or buildings envelope in general of, or in the case of urban paving, are described and then the single materials are illustrated.Experimental and numerical data, as reported in the bibliography, support the dissertation with examples from the most recent research contributions.

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Kovalskiy, V., M. Drukovanyy et Y. Oliinyk. « ANALYSIS OF WAYS TO INCREASE RADIATION PROTECTION OF BUILDING MATERIALS ». Modern technology, materials and design in construction 30, n^o 1 (2021) : 34–41. http://dx.doi.org/10.31649/2311-1429-2021-1-34-41.

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The paper considers the problems of environmental pollution by radiation-hazardous and environmentally harmful elements. Radiation-hazardous pollution occurs in several directions, namely under the influence of constant natural radiation background, due to Chernobyl emissions, nuclear energy production, pollution of rivers and lakes, the use of building materials with high content of natural radionuclides. At present, Ukraine has suspended comprehensive measures to reduce radiation pollution in the construction industry due to the lack of effective methods to combat environmental safety and improve the demographic situation in the country. As ways to increase the radiation-protective properties of building materials, variants of structural models, construction technologies are considered, the introduction and improvement of which is a prospect of scientific development of the construction industry. For environmentally safe, economically feasible, systematically operated operation of building structures and construction sites in general, it is essential to adhere to the principles of radiation protection by optimizing the resource characteristics of the respective facilities. Therefore, the analysis of the relevance of the above methods of creating high-quality building materials, taking into account the indicators of increasing the radiation-protective properties of building materials.

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Mulia, Dini Siswani, Cahyono Purbomartono et Juli Rochmijati Wuliandari. « Fish Health Management Through Utilization of Natural Materials ». Altifani Journal : International Journal of Community Engagement 2, n^o 2 (20 juillet 2022) : 110. http://dx.doi.org/10.32502/altifani.v2i2.4774.

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Freshwater fish farming is appealing to parents and adolescents, including Madrasah Aliyah Miftahussalam, Banyumas students. However, partners frequently find diseased fish. This exercise seeks to improve partners' awareness of fish health management using natural substances. The method of activities carried out includes coordinating the preparation of activities with partners, compiling modules, implementing activities, and evaluating the results of actions. The implementation of the activities was carried out in 4 stages, namely pre-test, delivery of material, discussion and question-answer, and post-test. The pre-post test data were analyzed using a paired T-test. The activity was declared victorious with an indicator of increasing knowledge and understanding of at least 30%. The data analysis results showed a difference in the average value of the pre-post test with a significance value of 0.000 <0.05. These results indicate that service activities have a positive effect on increasing partner knowledge and understanding. The average value obtained at the pre-test was 50, then increased at the post-test to 74.35. The post-test results increased by 48.7% compared to the pre-test. This result is higher than the planned achievement target of 30%. Based on the reality and the questionnaire results, the partners were very enthusiastic about participating in this service activity. Service activities will continue to be carried out as a form of concern and transfer of science and technology to the community, as well as the application of the tri dharma of higher education.

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Gu, Yunqing, Lingzhi Yu, Jiegang Mou, Denghao Wu, Peijian Zhou et Maosen Xu. « Mechanical properties and application analysis of spider silk bionic material ». e-Polymers 20, n^o 1 (24 août 2020) : 443–57. http://dx.doi.org/10.1515/epoly-2020-0049.

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AbstractSpider silk is a kind of natural biomaterial with superior performance. Its mechanical properties and biocompatibility are incomparable with those of other natural and artificial materials. This article first summarizes the structure and the characteristics of natural spider silk. It shows the great research value of spider silk and spider silk bionic materials. Then, the development status of spider silk bionic materials is reviewed from the perspectives of material mechanical properties and application. The part of the material characteristics mainly describes the biocomposites based on spider silk proteins and spider silk fibers, nanomaterials and man-made fiber materials based on spider silk and spider-web structures. The principles and characteristics of new materials and their potential applications in the future are described. In addition, from the perspective of practical applications, the latest application of spider silk biomimetic materials in the fields of medicine, textiles, and sensors is reviewed, and the inspiration, feasibility, and performance of finished products are briefly introduced and analyzed. Finally, the research directions and future development trends of spider silk biomimetic materials are prospected.

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Moon, Deok Hyun, et Agamemnon Koutsospyros. « Stabilization of Lead-Contaminated Mine Soil Using Natural Waste Materials ». Agriculture 12, n^o 3 (4 mars 2022) : 367. http://dx.doi.org/10.3390/agriculture12030367.

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Stabilization was applied as a remediation option for immobilizing lead (Pb) in contaminated mine soil. Four types of waste materials were used as stabilizing agents, namely waste oyster shells (WOS), calcined oyster shells (COS), natural starfish (NSF), and spent-coffee-grounds-derived biochar (SCGB). The Pb-contaminated mine soil was treated with the stabilizing agents ranging from 0 to 10 wt% and a curing period of 28 days. The toxicity characteristic leaching procedure (TCLP) was employed for evaluating the effectiveness of the remedial process. The Pb immobilization mechanism in the treated mine soil was investigated using scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM-EDX) analyses. The obtained results showed that the TCLP Pb levels decreased as the stabilizing agent dosage increased. The WOS and COS stabilizing agents immobilized Pb effectively in the contaminated mine soil. Application dosages of 4 wt% and 2 wt% for WOS and COS, respectively, were sufficient for compliance with the TCLP regulatory level of 5 mg/L. For the NSF and SCGB treatments, 4 wt% and 10 wt%, respectively, were necessary to meet the TCLP regulatory limit. The effectiveness of Pb immobilization was found to increase in the following order: SCGB < NSF < WOS < COS. The chemical fraction analyses showed that the lower F2 (weak acid soluble) fraction and higher F3 (reducible) and F4 (oxidizable) fractions were most likely associated with the high level of Pb immobilization. Moreover, the SEM-EDX analysis results showed that the most effective Pb immobilization could be strongly associated with the pozzolanic reaction products.

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