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Online since: October 2023
Authors: Fermín Bañón-García, Alejandro Sambruno, Francisco Javier Puerta-Morales, Álvaro Gómez-Parra, Pablo Márquez
One of the main stages of the process is the filling of the mould cavity, where a correct design of each component will lead to a reduction of negative effects on the generated part.
In general, this contraction phase causes an additional reduction in the height of the melt that generates a cavity in the part.
In parallel, equation (2) will be solved with the data of the selected part and the selected riser.
This data is of great relevance if the functional performance of the part to be manufactured is taken into account.
Online since: January 2013
Authors: Min Luo, Xue Chuan Wang, Tao Tao Qiang, Qiao Qiao Bu
Reasons for this phenomenon are: At first time, the force of absorption between CF and dye is stronger because of the higher dye concentration, but dye concentration reduces gradually with the progress of adsorption, which lead to a reduction of the adsorption force, so the absorption function becomes weaker[11], finally adsorption equilibrium was reached when adsorption time was about 8h, continue to extend the time will only increased the energy consumption but had no obvious influence on the adsorption capacity.
Fig. 4 showed the effect of temperature on dye adsorption: As the temperature was 25~40°C, the adsorption capacity increased with the rise of temperature, but it declined when the temperature was higher than 40°C, the probably reason for this is: the adsorption process may not only include chemical adsorption but also a certain physical adsorption, since the binding between absorbent and dye molecule is weaker in physical adsorption and may occur a process of desorption when the temperature is become higher[12], resulting in a reduction of adsorption capacity.
The adsorption isotherm of the dye at different temperatures was fitted using the Langmuir equation (eq2-1) and Freundlich equation (eq2-2) [14] and the data were further analyzed according to the equations.
The pseudo-first-order (eq2-3) and pseudo-second-order (eq2-4) were used to test the adsorption kinetics data and investigate the mechanism of adsorption[17].
Online since: January 2012
Authors: Uma Thanu Subramonia Pillai, Bellambettu Chandrasekhara Pai, Kumaraswamy Kaliamma Ajith Kumar, Madhusudan Chakraborty
At least 10 symmetrical readings were taken from each sample to get the representative data.
The height loss data was converted to volumetric loss by multiplying it with area of cross section of the test pin.
The pin-on-disc wear testing machine provides information on reduction in height due to wear of the specimen pin.
With increase of normal load, gradual reduction in wear resistance observed in Fig.3b is due to the higher stress induced in the wear surface.
Online since: October 2002
Authors: F. Zhang, L. Lu, M.O. Lai
After MA for 10 hours, the lattice parameter of Al decreases rapidly in comparison with the reduction process of the previous stage.
It seems hard to explain the present experimental findings using the above data.
These data show that during the ball milling process, plastic deformation and the fracturing of Mn is less common than that of Nb.
The relatively brittle Ti is supposed to be fractured easily than the ductile Al powder and therefore results in a higher rate of grain size reduction.
Online since: August 2013
Authors: K.J. Hughes, Nurkholis Hamidi, Slamet Wahyudi, I.N.G. Wardana, M. Lawes, Willyanto Anggono
Schematic Diagram of Experimental System The laminar burning velocity of a spherically expanding flame can be deduced from the schlieren photographs, the stretched flame velocity (Sn) can be derived from the flame radius versus time data as: Sn = dru/dt, where ru is the flame radius in the Schlieren photographs and t is the elapsed time from spark ignition.
The gradient of the best straight line fit to the experimental data gives Lb.
Compare to a methane-air mixture, the presence of carbon dioxide and nitrogen in the biogas caused a reduction in the laminar burning velocity [1,2,27] for two reasons.
Conclusion The presence of carbon dioxide and nitrogen in the biogas-air mixtures cause a reduction in the laminar burning velocity for two reasons, First, the dilution effect lead to a lower concentration of reactive substances in the fuel-air mixture for a given equivalence ratio, which lead to a lower overall chemical reaction rate in the bimolecular reactions in the fuel oxidation reaction process.
Online since: January 2013
Authors: Sung Woo Shin, Kwang Soo Lee, Kang Sik Kim
The ACI 349-06 does not suggest criteria for anchor bolt diameter greater than 50mm or effective embedment depth deeper than 635mm, because it was based on the research data of small anchorage system[5-8].
Three curves are drawn by strain data for 3 loading stages(1/3Pmax, 2/3Pmax and Pmax : Pmax is maximum test value).
Therefore, the diameter of anchor bolt(d0) affects the changes in breakout shape due to reduction of load-bearing stress distance(l) related to load transmission and increases stress area of large anchorage system.
(a)Test results vs ACI349-06 (b) Ratios of test result and ACI349-06 ( c ) Ratios of test result and ACI349-06 by shape ratio Fig. 10 Shear capacities by effective embedment depth Conclusions In this study, the shear breakout fracture strength and shear behavior of large anchorage system have been investigated, and the following conclusions can be drawn from the investigations. 1) Vaci90 was overestimated by 42 to 105% than Vaci06, which was in compliance with the objective of the revision to ACI340-01 based on CCD method, and the test values Vtestwere analyzed as 50 to 68% of the predicted value Vccd based on small anchor test value. 2) The diameter of anchor bolt(d0) affects the changes in breakout shape due to reduction of load-bearing stress length(l) related to load transmission and increases stress area of large anchorage system. 3) The analysis on the bending behavior of large anchor bolt by loading stages indicates that the load-bearing stress length (l) of
Online since: May 2014
Authors: Yong Quan Zhu, Su Min Zhang
Nonlinear data fitting was performed to obtain the model parameters.
The in situ monitored tunnel deformation data were utilised for back analysis of the parameters by establishing a 3D viscoelasto-plastic calculation model.
But the horizontal displacement converged still more quickly than the height reduction, resulting in still smaller space and still larger height/span of the upper bench.
With suspension time the longitudinal displacements had no trend of growth rate reduction, showing that if the work face was not sealed or consolidated on suspension, the rock ahead of the work face would deform continually with a steady rate, long suspension time would cause large longitudinal displacement and failure of the work face.
Online since: March 2015
Authors: A. Surya Mitra, A. Manideep, E. Rathakrishnan
Nevertheless the data are accurate enough to capture the overall features such as extent of the supersonic core region, the number of shock cells and the spacing between them.
Thus a reduction of about 22% is caused by the tab whereas at NPR5 once again the core length for both the cases are almost identical at around 7.5D.
Thus a reduction of about 28% is caused by the tab at NPR 3.
Conclusions The analysis of data obtained with and without control for the nozzle and orifice shows that the tab effectiveness is influenced by the boundary layer and the expansion level at the nozzle exit.
Online since: August 2020
Authors: Suntree Sangjan, Wadchara Thongsamer
It can be to inhibit the recombination between electron (e-) and hole (h+) in photocatalytic activity, which enhances photo-oxidation and photo-reduction in photodegradation.
(a) Linear plot of q(mg/g) with irradiation time(Ln(t)) and (b) Linear plot of q(mg/g) with irradiation time ( t0.5) for MB photodegradation by using photocatalyst composite hydrogel beads Table 1 shows that the results of the fitting of the photocatalytic and adsorption kinetic data for photodegradation by using SA, ZnO/SA, ZnO+AgNO3/SA, ZnO+g-C3N4/SA, ZnO+Fe3O4/SA, and ZnO+GO/SA composites hydrogel beads.
Constants of photocatatalytic and adsorption process are derived from the fits of the corresponding models to the experimental data of Fig.4. and Fig. 5 Constant Value Composite hydrogel beads SA ZnO/SA ZnO+AgNO3 /SA ZnO+g-C3N4 /SA ZnO+Fe3O4 /SA ZnO+GO /SA qe(mg/g) 0.11 0.14 0.12 0.13 0.14 0.14 k1 (x 10-3)(min-1) 3.68 4.14 5.98 6.91 5.07 5.98 R2 0.8244 0.9489 0.8759 0.885 0.9839 0.8857 k2 (x10-3)(g.mg-1.min-1) 0.78 2.28 2.06 5.05 2.28 5.01 R2 0.9703 0.9525 0.969 0.9943 0.9525 0.9904 Desorption Rate(b) (mg/(g.min)-1) 40.00 33.89 38.17 42.37 34.84 34.48 Adsorption Rate(a) (g/mg) 0.26 0.22 0.15 0.04 0.19 0.09 R2 0.8988 0.972 0.9309 0.9262 0.92 0.9698 ki (x10-3)(mg.g-1.min1/2) 4.5 5.7 5.2 5.4 5.9 6.2 R2 0.8628 0.9391 0.8836 0.803 0.973 0.886 Table 1 shows that the pseudo first order and peudo second order in photodegradation process by using AgNO3, g-C3N4, Fe3O4, and GO doped ZnO photocatalyst composites hydrogel beads.
The h+ and e- can be photo-oxidation and photo-reduction reaction, respectively.
Online since: September 2013
Authors: Nian Yu Huang, Hua Jun Luo, Zhi Yong Guo, Lei Chen, Wei Qiao Deng, Lei Jin
MS data were measured on API 4000 LC-MS/MS system. 1.2 Synthesis General procedure for preparation of the (2Z,3R,3aR,4E,6S,7aS)-4-(aminomethylene)- 3,6-dimethyl-2-(3-methylbutylidene)octahydrobenzofuran-3-ol (2): To a solution of compound 1 (0.252 g ,10 mmol )in anhydrous ethanol (20 mL) was added 80% hydrazine hydrate (0.200 g, 5.0 mmol )slowly for three times at room temperature.
All data were presented as mean ± standard deviation and analyzed by SPSS.
Results and discussion 2.1 Chemistry The bioactive sesquiterpene bisabolangelone exhibited remarkably preventive and therapeutic action on gastric ulcer, and its reduction derivatives was also found to possess better inhibitory activity against H+/K+-ATPase in our recent work [6].
The hydrozone (2) were synthesized from the hydrazine hydrate and bisabolangelone reduction product (1), which reacted with isocynate to give the target hydrazone carboxamides (3a-3e) in moderate yields (52-78%).
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