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Search Results: 1 - 10 of 71 matches for " plaster "
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What You Can and Can’t Change: Lay Perspectives on Seligman’s Guide  [PDF]
Adrian Furnham
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.612142
Abstract: Seligman (2007) reported 10 facts about what psychological processes and problems can be changed, and those that cannot be changed. Over 250 participants completed a questionnaire where they indicated the extent to which they agreed with Seligman, as well as a measure of the Big Five personality traits, CORE self-beliefs and a measure of Dweck’s (2012) “Change Mindset” questionnaire. Lay people did not agree with Seligman and factor analysis did not confirm his grouping. Regressions indicated that age, sex, religiousness and Mindset were related to beliefs about change. Limitations are noted.
Behavior of plasters on the modern heat-effective exterior walls of buildings (rus)
Babkov V.V.,Sinitsin D.A.,Kildibaev R.S.,Rezvov R.S.
Magazine of Civil Engineering , 2012,
Abstract: Physical and mechanical characteristics, the most significant for the plasters with regard to the features of their behavior as the coating of building faces were evaluated. Results of quantitative estimation of stresses in the plaster layers on surfaces of different stiffness due to the plaster shrinkage are given. It is shown that with a decrease of the surface modulus of elasticity, stresses in the plaster coating are decreased either due to reduction of the effect of its deformations’ constraint. By analysis and with experiments it is proved, that the main factor evaluating the ultimate extensibility of the mortar is its viscoelasticity modulus, while mortar strength increase involves its stresses increase.
Theoretical preconditions for optimization of composition and technological parameters of the plaster for walls made of aerated concrete blocks (rus)
Paruta V.A.,Sayevskiy A.A.,Semina Yu.A.,Stolyar E.A.
Magazine of Civil Engineering , 2012,
Abstract: The paper reveals the mechanism of cracking in the "aerated concrete masonry - plaster coating" system, which causes the reduction of cladding’s durability. The temperature deformations in the structure are analyzed. On this basis the theoretical background to optimize the composition and technological parameters of the plaster was developed. The composition of plaster mixtures based on the expanded clay, carbonate, perlite and other fillers was also developed. The proposition that targeted modification of plaster can ensure optimal operation of the "laying-plaster" system is experimentally confirmed.
Microscale electrochemical cell using plaster (CaSO4) as liquid junction
Yuthapong Udnan
Maejo International Journal of Science and Technology , 2008,
Abstract: A microscale apparatus for electrochemical cell in which plaster (CaSO4) was used as liquid junction has been developed. A glass tube (0.5 cm ID x 5.0 cm) was used to prepare each half-cell. The potentials of the resulting galvanic cells were measured by a multimetre and were compared to those of the galvanic cells in which agar was used as liquid junction. It was found that the potentials produced by the galvanic cells with plaster as liquid junction are not significantly different from those of the cells with agar as liquid junction and close to the theoretical values. In addition, when the developed apparatus was used for the study of electrolysis of potassium iodide solution, it was found that the electrolytic cell made from the microscale apparatus with plaster liquid junction can distinctly separate the reactions occurring at the anode and the cathode. Moreover, the lifetime of the plaster liquid junction is much greater than that of the agar liquid junction.
Influence of the Addition of Sand and Compaction on the Mechanical and Thermal Performances of Plaster  [PDF]
Saida Dorbani, Fattoum Kharchi, Fatiha Salem, Karima Arroudj, Nadia Chioukh
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.39109
Abstract: Since antiquity, man used to stock up materials and products existing in his close surroundings to build his house, which provides him shelter and comfort. Within the present work, mixtures of plaster and dune sand have been studied with the aim of valorization of locally abundant materials. The tests showed that with the addition of dune sand and the compaction, an optimal mixture (67% plaster and 33% dune sand) can be used as a carrier element for construction of up to three levels; since significant increase of the mechanical strength has been observed. The element obtained offers an acceptable thermal insulation with a decrease in the thickness of the outer wall construction. The use of this gypsum’s mortar block as a carrier element in a structure not exceeding three levels, also enables a considerable savings especially in areas where sand and plaster are abundant and relatively inexpensive.
Percep??o de caieiros quanto às conseqüências do trabalho no processo saúde-doen?a
Silva,Cheila Portela; Rodrigues,Angelo Brito; Dias,Maria Socorro de Araújo;
Revista de Saúde Pública , 2007, DOI: 10.1590/S0034-89102007000500021
Abstract: the objective of the study was to evaluate the perception of lime factory workers regarding work-related health-disease process. data were collected from ten workers through non-structured observation and semi-structured interviews conducted in lime factories in the state of ceará, northeastern brazil, in december 2005. lime workers did not perceive themselves as being at risk for serious health outcomes, which has led them not to develop health promotion actions.
PREPARATION OF THE OPEN PORE ALUMINUM FOAMS USINGINVESTMENT CASTING PROCESS
PREPARATION OF THE OPEN PORE ALUMINUM FOAMS USING INVESTMENT CASTING PROCESS

LCWang,FWang,
L.C.
,Wang,and,F.,Wang

金属学报(英文版) , 2001,
Abstract: This paper briefly presents characteristics, application and development of the metallic foams. Sound specimen has been achieved with preparing foam aluminum by using investment casting process. The preparation of plaster prefabricated mould is one key in investment casting. Main composition, ingredient and affecting factors of plaster mould are also discussed and the vacuum-infiltrated shaping technique was found to be another important link. The penetrating model and the affecting mechanism of the main parameters were also analyzed. As a result, the optimum values were determined.
Ultrasonic characterization of frequency dependent attenuation properties of plaster boards
Asafaa T. B.
Journal of Engineering and Applied Sciences , 2012,
Abstract: Plaster boards are heterogeneous materials with quite substantial degree of attenuation when exposed to ultrasonic waves. The attenuation properties are determined from the frequency shifts induced by the presence of scatterers within the material continuum. In this work, ultrasonic principle is used to estimate the frequency shifts in three different plaster boards-Cement board (CB), Glass Fiber Reinforced Gypsum (GRG) and Exterior Glass fiber Reinforced Gypsum (EGRG) - for the purpose of attenuation characterization. 49 signals, obtained via ultrasonic backscattered echo technique, were extracted from the samples of each material with contact mode Harisonic 2.25MHz transducer connected to the workstation. These signals are processed via time domain and optimized homomorphic analyses. Histograms of the time domain results indicate a general shift towards the low amplitudes and non-uniform shift magnitudes are observed in each sample and across the three materials. The skewness and standard deviation of the frequency shifts clearly show some fundamental differences in scattering and absorption nature of these materials. Downwards shifts in the centre frequencies compared to the steel reference material are equally significant. The mean center frequencies are found to be 2.3891, 2.2695 and 2.2102MHz for CB, GRG and EGRG respectively indicating lowest attenuation in CB. Also, attenuations are found to increase with increase in frequency within the limit of the transducer bandwidth of 2.0286 and 3.4402 MHz. Tests of repetitions confirm that the observed frequency changes are due to sample non-uniformity and not signal processing artifacts.
Interpretation of the Phenomena of Heat Transfer from Representations of Nyquist and Bode Plots
K. Ould Cheikh,I. Diagne,M. L. Sow,M. S. Ould Brahim
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: The thermal impedance of a tow-plaster material is determined from the thermal electrical analogy in the dynamic frequency regime. The thermophysical characteristics magnitudes of the material, thermal conductivity and coefficient of thermal diffusivity are relating to shunt and series resistances determined from the results of the study of representations of Nyquist and Bode plots. The study applied to the composite tow-plaster showed it can be used as a good thermal insulator.
EFFECT OF PROCESS PARAMETERS ON MECHANICAL PROPERTIES OF THE INVESTMENT CASTINGS PRODUCED BY USING EXPANDABLE POLYSTYRENE PATTERN
Nikhil Yadav,D. B. Karunakar
International Journal of Advances in Engineering and Technology , 2011,
Abstract: The present study is concerned with the investigation of mechanical properties of A713 alloy castings produced by investment casting process using expandable polystyrene as the pattern material and the plaster of paris as the mould material. Experiments were conducted as per Taguchi’s L9 orthogonal array. Castings were made under the constraint of different process parameters like mould firing temperature, pouring temperature, firing time and mixing of silica sand of different grain fineness numbers to investigate their effects on the surface hardness, impact strength and tensile strength of the final castings. The variations in the trend of the aforesaid mechanical properties were observed and it was deduced out that high mould firing temperature, higher pouring temperature, maximum firing time and high grain fineness number significantly reduce the mechanical properties of A713 alloy castings produced by the above process.
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