Yojo T.,Institute for Technological Research |
Pigozzo R.J.B.,Institute for Technological Research |
Miranda M.J.D.A.C.,Institute for Technological Research |
Souza C.O.,Institute for Technological Research |
Brazolin S.,Institute for Technological Research
WCTE 2016 - World Conference on Timber Engineering | Year: 2016
This paper presents a three dimensional wood cell model formulated as a multi-layered tube formed by the compound middle lamella and three layers of the secondary cell wall. Each layer was considered as a composite material derived from matrix and fiber, by rule of mixtures, where lignin and hemicellulose represent the matrix and the cellulose microfibrils the fiber. The resulting composite in each layer can be orthotropic or isotropic, when considering the local axis defined by microfibril orientation, but it can be anisotropic in the global coordinates. A cylindrical coordinate has been used to obtain the theoretical wood cell model considering compatibility, equilibrium, constitutive equations and boundary conditions. This model allows calculate the internal force and torque in wood cell, as well as, the internal stresses in each layer for sound and deteriorated wood by fungi, in order to evaluate the strength of wood and the safety of structures.
Elbadawi M.,Institute for technological research |
Osman Z.,Institute for technological research |
Paridah T.,University Putra Malaysia |
Nasroun T.,Agricultural research corporation |
Journal of Materials and Environmental Science | Year: 2015
In this study the influence of adding a blend of tannins extracted from the bark of two Acacia species on the mechanical and physical properties of laboratory particleboards made from UF resin and underutilized raw materials was investigated The comminuted bark of Acacia seyal var. seyal (Ass) and Acacia nilotica spp. tomentosa (Ant) was extracted with hot water (initial temperature was 90°C) using a ratio of 1:6 powdered bark to water (w/v). Their spray dried tannins powder was blended (BT, 1:1) and was added as concentrated solution (35%) to UF resin at three different levels (5%, 10% and 15%, w/w) The obtained panels were evaluated for their mechanical and physical properties according to the BS EN relevant standards. The obtained results revealed an increase in the modulus of rupture (MOR), modulus of elasticity (MOE), and internal bond strength (IB) of these panels when small amount (5%) of BT was added. In contrast addition of higher percentages (10&15%) was found to decrease the mechanical properties. It was also observed that the addition of BT to UF did not improve the physical properties (Thickness swelling (TS, 24 h) and water absorption (WA, 24 h), which remained comparable to the control panels.
Elbadawi M.,Institute for Technological Research |
Osman Z.,Institute for Technological Research |
Paridah T.,University Putra Malaysia |
Nasroun T.,Agricultural Research Corporation |
Cellulose Chemistry and Technology | Year: 2015
The aim of this study was to investigate the effect of adding a blend of tannins to commercial urea formaldehyde (UF) on the properties of particleboard made from wood particles of Acacia seyal var. seyal. The tannins were extracted from the bark of Acacia seyal var. seyal (Ass) and Acacia nilotica subsp. tomentosa (Ant) with hot water (initial temperature was 90 °C), using a ratio of powdered bark to water of 1:6 (w/v). The tested Acacia species (Ass and Ant) exhibited high tannin contents (82.18% and 73.09%, respectively). A blend from the two tannin types (BT) was made (1:1 w/w) and added to UF in the form of a concentrated solution (35%) at three different percentages (5%, 10% and 15%, weight/weight). The different UF-BT formulations were used to produce particleboards (340 mm × 340 mm × 10 mm in size). The obtained panels were tested according to the BSEN relevant standards and showed high mechanical properties, compared to the ones produced by solely UF. It was also observed that the addition of BT to UF did not improve the physical properties of the panels (thickness swelling (TS) and water absorption (WA)), but the results obtained were slightly higher than the ones for the UF panels.
Oliveira A.M.,Institute for Technological Research |
Zanin M.H.A.,Institute for Technological Research
Advanced Materials - TechConnect Briefs 2016 | Year: 2016
Increasing concerns for the preservation of environmental and sustainnability of resources have been draw and the use of recycled polyethylene terephthalate (PET) is one of alternatives to non-renewable resouces in material technogy. The main purpose of the work is to produce by recycled PET a nanofiber by the electrospinning technique. The work consists of polimeric solution preparation to be electrsopun, followed by definition of parameters of electrospinning process and finally the nanofiber production. Afterwards, characterization of PET nonwoven nanofiber that includes Thernal analysys, Termogravimetric analysis, Scanning Electron Microscope (SEM) and contact angle measurement. The results show that the conditions of electrospinning process adopted were suitable to obtain a nonwoven fiber, with filaments in nanoscale. Moreover, the fiber, even with the processing, the PET polymer retained its properties without showing signs of degradation, thus creating a new alternative to the use of the material, with high functional value.
Bledzki A.K.,West Pomeranian University of Technology |
Franciszczak P.,West Pomeranian University of Technology |
Osman Z.,Institute for Technological Research |
Elbadawi M.,Institute for Technological Research
Industrial Crops and Products | Year: 2015
The presented research study compares different types of common natural fibers used as a reinforcement in plastic composite industry. It contains characterization of each fiber type, its preparation method, and its chemical and physical properties. It follows from a description of the polypropylene biocomposite manufacturing process and physical properties of the obtained biocomposite materials. The biocomposites were manufactured in the same way and have the same matrix-to-fibre content (60/40. wt%). Therefore, the particular physical and chemical properties of the fibers used as a reinforcement and their influence onto mechanical properties of their biocomposites can be evaluated. This approach provides practical tools of how to tailor the properties of PP biocomposites by simply choosing an adequate fiber type as a matrix reinforcement. Furthermore, the information regarding: cultivation, price, and availability are compared to give a holistic view for these most common natural fibers for technical applications in plastic industry. © 2015 Elsevier B.V.
Leal A.G.,Institute for Technological Research |
Santiago A.,Institute for Technological Research |
Miyake M.Y.,Institute for Technological Research |
Noda M.K.,Institute for Technological Research |
And 2 more authors.
2014 IEEE Brasil RFID | Year: 2014
Brazil is approving a series of new regulations, standards for RFID and loT components applied in transportation scenarios. At this stage, there is already a need for interoperability and Brazilian regulators require that interoperability should satisfy recognized standards such as NTCIP, SINIA V, and ISO/IEC 18000-6. Although there are studies of the higher evolutionary level of loT, much more are needed on the standardization of interfaces and communication protocols. The infrastructure created at IPT will grow to allow testing of products, environments, services, and innovative RFID solutions with applications in the context of the Internet of Things. The main purposes for laboratory are for teaching and research, and the next step involves the connection with experimental networks of Future Internet. Thus, enabling researchers, teachers, and students to conduct experimental research using innovative technologies offered by these systems. Consequently, we can form a critical mass of knowledge and skills required to identify and seize new business opportunities, mainly in V21 and V2V environment.
Rodrigues D.,Federal University of Fluminense |
Janasi S.R.,BRATS Sintered Filters and Metallic Powders |
Fredericci C.,Institute for Technological Research |
De Campos M.F.,Federal University of Fluminense |
De Castro J.A.,Federal University of Fluminense
International Powder Metallurgy Congress and Exhibition, Euro PM 2013 | Year: 2013
CoCrMo prosthesis (wrought or as cast) are usually coated with mono-layers of CoCrMo beads (spherical metallic particles) to improve osseointegration throughout the increase of surface area. In order to establish a tridimensional physical model of the coating, cylindrical samples were produced by pressing and sintering. As sintering was carried out in a dilatometer, the linear shrinkage was evaluated. Variables as heating rate and sintering temperature were investigated. Physical properties of the sintered samples were determined. The neck growth was evaluated considering the sintering variables. Microstructural aspects of the sintered samples are presented and discussed.