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Kalawate A.,Indian Plywood Industries Research and Training Institute IPIRTI | Dethe M.D.,MPKV
Journal of Biopesticides | Year: 2012

In the present study, bioefficacy of spinosad (56.25, 72 and 90 g a.i. ha-1) and emamectin benzoate (5, 6.25 and 12.5 g a.i.ha-1) was studied in comparison to cypermethrin (50 g a.i. ha-1) and self-formulated neem seed extract (5 %). Field experiments were undertaken for two cropping seasons during kharif 2005 and summer 2006. From the study it was found that spinosad afforded moderate control of jassid, whitefly and aphid. However, it was found to be the most effective against BSFB. Although corresponding yield recorded in cypermethrin (check treatment) was higher (16.30 and 21.01 t ha-1) it was not significantly different than that noticed in spinosad and emamectin benzoate. Source


Vengala J.,Indian Plywood Industries Research and Training Institute IPIRTI | Van de Lindt J.W.,Colorado State University
Asian Journal of Civil Engineering | Year: 2013

The use of bamboo as a structural construction material is gaining traction primarily because (i) it is a rapidly growing material and thus sustainable, and (ii) it has many positive engineering attributes such as its high strength-to-weight ratio in tension. One area of recent development has been the use of bamboo-based construction in seismically active regions of India. In this paper the seismic behaviour of one type of bamboo-based construction is examined and validated by calibrating a non-linear numerical model to wall panel experimental results, and then performing multi-record incremental dynamic analysis (IDA) on the full system level model. The response was very reasonable due, in part, to the relatively light weight of the bamboo roof system. Most importantly, the damage to the bamboo-mortar walls during testing, and particularly the eventual failure mechanisms, were consistent with modern engineered materials thus confirming that this type of construction is a viable alternative for seismic regions, particular in developing countries. Source


Rao K.S.,Andhra University | Tilak B.,Andhra University | Rajulu K.Ch.V.,Indian Plywood Industries Research and Training Institute IPIRTI | Swathi A.,Andhra University | Workineh H.,Andhra University
AIP Conference Proceedings | Year: 2011

Recently a new wave of interest has risen on relaxor ferroelectrics with complex perovskite structure due to their wide use in fabrication of multilayer ceramic capacitors, electrostrictive actuators, and electromechanical transducers. The polycrystalline 0.93(Bi 0.5Na 0.5)Ba 0.07Z 0.04T 0.96O 3 (0.07BNBZT) ceramic material, which is in the vicinity of the morphotropic phase boundary (MPB) has been prepared by using high temperature solid state reaction method. The tolerance factor has been estimated and found to be 0.815. XRD analysis revealed a rhombohedral perovskite type structure. SEM micrographs showed highly dense grains with rectangular shape. The average grain size is found to be 1.51μm. Dielectric studies in the material ha indicated relaxor behaviour with diffuse phase transition. High value of ε m>1958 is found at 1kHz, Tm (phase transition temperature) 335°C, The diffuseness parameter was established to be 1.60 revealing the relaxor behaviour. Further, to confirm the relaxor behaviour in the material, Vogel-Fulcher (V-F) relation has been used. Estimated V-F parameters are found to be T f=138°C, E a=0.080eV and ν o=2.32×10 8Hz. Cole-Cole analysis has shown a non-Debye type relaxation in the system. Conductivity studies in the material obeyed the Jonscher's power law in frequency range of (45Hz-5MHz) and temperature range of (35°C-600°C). The electric conduction in the system may be due to hopping/mobility/ transportation of charge carriers. © 2011 American Institute of Physics. Source


Rao K.S.,Andhra University | Tilak B.,Andhra University | Rajulu K.Ch.V.,Indian Plywood Industries Research and Training Institute IPIRTI | Swathi A.,Andhra University | And 2 more authors.
AIP Conference Proceedings | Year: 2011

In the course of search for environmental-friendly lead-free relaxor ferroelectrics, (Bi,Na)TiO 3-(NBT) based ceramics show very good physical properties among several lead-free compositions. The NBT composition exhibits a strong ferroelectricity and high Curie temperature, and considered to be a good candidate for lead-free ceramics as a substitute for lead-based materials (e.g., PZT). In the present communication barium substituted NBT, (Na 0.5Bi 0.5) 0.912Ba 0.088TiO 3-0.088BNBT composition has been prepared by conventional solid-state reaction process. The tolerance factor has been estimated and found to be 0.819, indicating the stability of the perovskite structure. The XRD analysis of the material revealed a pure perovskite with tetragonal structure. The average grain size as observed from SEM, was found to be 1.04μm. Detailed studies exhibit a relaxor behaviour with diffuse phase transition. The diffuseness parameter has been established to be 1.97. The dielectric relaxation obeyed the Vogel-Fulcher (V-F) relation. From the V-F plot, the obtained values are T f=305°C, Ea=0.0131eV and ν o=2.95×10 5 Hz, which provide the evidence of relaxor behaviour. The electrical behaviour has been probed through complex impedance spectroscopy. The frequency-dependent conductivity spectra obey the power law in the frequency range of 45Hz-5MHz and temperature range of 35°C-60°C. © 2011 American Institute of Physics. Source


Uday D.N.,Indian Plywood Industries Research and Training Institute IPIRTI | Sujatha D.,Indian Plywood Industries Research and Training Institute IPIRTI | Pandey C.N.,Indian Plywood Industries Research and Training Institute IPIRTI
Journal of the Indian Academy of Wood Science | Year: 2011

The plywood industries had been utilizing plantation timbers and other lesser known timbers for making plywood because of non-availability of conventional timbers. Melia dubia (malabar neem wood) has been identified as one of the fast growing species that would be suitable for plywood making and a study was carried out for determining its suitability for plywood manufacture. Investigations have shown that type-B surface veneers could be produced by peeling and the veneers could be dried without major degrades. Gluing and bonding properties have been studied and found that the panels made using urea formaldehyde and phenol formaldehyde adhesives meets the requirement of MR and BWR grade plywood as per relevant specification. © Indian Academy of Wood Science 2012. Source

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